1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include <float.h>
  29 #include "utilities/debug.hpp"
  30 #include <float.h> // for DBL_MAX
  31 
  32 // use this for flags that are true per default in the tiered build
  33 // but false in non-tiered builds, and vice versa
  34 #ifdef TIERED
  35 #define  trueInTiered true
  36 #define falseInTiered false
  37 #else
  38 #define  trueInTiered false
  39 #define falseInTiered true
  40 #endif
  41 
  42 #ifdef TARGET_ARCH_x86
  43 # include "globals_x86.hpp"
  44 #endif
  45 #ifdef TARGET_ARCH_sparc
  46 # include "globals_sparc.hpp"
  47 #endif
  48 #ifdef TARGET_ARCH_zero
  49 # include "globals_zero.hpp"
  50 #endif
  51 #ifdef TARGET_ARCH_arm
  52 # include "globals_arm.hpp"
  53 #endif
  54 #ifdef TARGET_ARCH_ppc
  55 # include "globals_ppc.hpp"
  56 #endif
  57 #ifdef TARGET_ARCH_aarch64
  58 # include "globals_aarch64.hpp"
  59 #endif
  60 #ifdef TARGET_OS_FAMILY_linux
  61 # include "globals_linux.hpp"
  62 #endif
  63 #ifdef TARGET_OS_FAMILY_solaris
  64 # include "globals_solaris.hpp"
  65 #endif
  66 #ifdef TARGET_OS_FAMILY_windows
  67 # include "globals_windows.hpp"
  68 #endif
  69 #ifdef TARGET_OS_FAMILY_aix
  70 # include "globals_aix.hpp"
  71 #endif
  72 #ifdef TARGET_OS_FAMILY_bsd
  73 # include "globals_bsd.hpp"
  74 #endif
  75 #ifdef TARGET_OS_ARCH_linux_x86
  76 # include "globals_linux_x86.hpp"
  77 #endif
  78 #ifdef TARGET_OS_ARCH_linux_sparc
  79 # include "globals_linux_sparc.hpp"
  80 #endif
  81 #ifdef TARGET_OS_ARCH_linux_zero
  82 # include "globals_linux_zero.hpp"
  83 #endif
  84 #ifdef TARGET_OS_ARCH_solaris_x86
  85 # include "globals_solaris_x86.hpp"
  86 #endif
  87 #ifdef TARGET_OS_ARCH_solaris_sparc
  88 # include "globals_solaris_sparc.hpp"
  89 #endif
  90 #ifdef TARGET_OS_ARCH_windows_x86
  91 # include "globals_windows_x86.hpp"
  92 #endif
  93 #ifdef TARGET_OS_ARCH_linux_arm
  94 # include "globals_linux_arm.hpp"
  95 #endif
  96 #ifdef TARGET_OS_ARCH_linux_ppc
  97 # include "globals_linux_ppc.hpp"
  98 #endif
  99 #ifdef TARGET_OS_ARCH_linux_aarch64
 100 # include "globals_linux_aarch64.hpp"
 101 #endif
 102 #ifdef TARGET_OS_ARCH_aix_ppc
 103 # include "globals_aix_ppc.hpp"
 104 #endif
 105 #ifdef TARGET_OS_ARCH_bsd_x86
 106 # include "globals_bsd_x86.hpp"
 107 #endif
 108 #ifdef TARGET_OS_ARCH_bsd_zero
 109 # include "globals_bsd_zero.hpp"
 110 #endif
 111 #ifdef COMPILER1
 112 #ifdef TARGET_ARCH_x86
 113 # include "c1_globals_x86.hpp"
 114 #endif
 115 #ifdef TARGET_ARCH_sparc
 116 # include "c1_globals_sparc.hpp"
 117 #endif
 118 #ifdef TARGET_ARCH_arm
 119 # include "c1_globals_arm.hpp"
 120 #endif
 121 #ifdef TARGET_ARCH_aarch64
 122 # include "c1_globals_aarch64.hpp"
 123 #endif
 124 #ifdef TARGET_OS_FAMILY_linux
 125 # include "c1_globals_linux.hpp"
 126 #endif
 127 #ifdef TARGET_OS_FAMILY_solaris
 128 # include "c1_globals_solaris.hpp"
 129 #endif
 130 #ifdef TARGET_OS_FAMILY_windows
 131 # include "c1_globals_windows.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_aix
 134 # include "c1_globals_aix.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_bsd
 137 # include "c1_globals_bsd.hpp"
 138 #endif
 139 #ifdef TARGET_ARCH_ppc
 140 # include "c1_globals_ppc.hpp"
 141 #endif
 142 #endif
 143 #ifdef COMPILER2
 144 #ifdef TARGET_ARCH_x86
 145 # include "c2_globals_x86.hpp"
 146 #endif
 147 #ifdef TARGET_ARCH_sparc
 148 # include "c2_globals_sparc.hpp"
 149 #endif
 150 #ifdef TARGET_ARCH_arm
 151 # include "c2_globals_arm.hpp"
 152 #endif
 153 #ifdef TARGET_ARCH_ppc
 154 # include "c2_globals_ppc.hpp"
 155 #endif
 156 #ifdef TARGET_ARCH_aarch64
 157 # include "c2_globals_aarch64.hpp"
 158 #endif
 159 #ifdef TARGET_OS_FAMILY_linux
 160 # include "c2_globals_linux.hpp"
 161 #endif
 162 #ifdef TARGET_OS_FAMILY_solaris
 163 # include "c2_globals_solaris.hpp"
 164 #endif
 165 #ifdef TARGET_OS_FAMILY_windows
 166 # include "c2_globals_windows.hpp"
 167 #endif
 168 #ifdef TARGET_OS_FAMILY_aix
 169 # include "c2_globals_aix.hpp"
 170 #endif
 171 #ifdef TARGET_OS_FAMILY_bsd
 172 # include "c2_globals_bsd.hpp"
 173 #endif
 174 #endif
 175 #ifdef SHARK
 176 #ifdef TARGET_ARCH_zero
 177 # include "shark_globals_zero.hpp"
 178 #endif
 179 #endif
 180 
 181 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
 182 define_pd_global(bool, BackgroundCompilation,        false);
 183 define_pd_global(bool, UseTLAB,                      false);
 184 define_pd_global(bool, CICompileOSR,                 false);
 185 define_pd_global(bool, UseTypeProfile,               false);
 186 define_pd_global(bool, UseOnStackReplacement,        false);
 187 define_pd_global(bool, InlineIntrinsics,             false);
 188 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 189 define_pd_global(bool, ProfileInterpreter,           false);
 190 define_pd_global(bool, ProfileTraps,                 false);
 191 define_pd_global(bool, TieredCompilation,            false);
 192 
 193 define_pd_global(intx, CompileThreshold,             0);
 194 
 195 define_pd_global(intx, OnStackReplacePercentage,     0);
 196 define_pd_global(bool, ResizeTLAB,                   false);
 197 define_pd_global(intx, FreqInlineSize,               0);
 198 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
 199 define_pd_global(intx, InlineClassNatives,           true);
 200 define_pd_global(intx, InlineUnsafeOps,              true);
 201 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 202 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 203 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
 204 define_pd_global(intx, ProfiledCodeHeapSize,         0);
 205 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
 206 
 207 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 208 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 209 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 210 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 211 define_pd_global(bool, NeverActAsServerClassMachine, true);
 212 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 213 #define CI_COMPILER_COUNT 0
 214 #else
 215 
 216 #if defined(COMPILER2) || INCLUDE_JVMCI
 217 #define CI_COMPILER_COUNT 2
 218 #else
 219 #define CI_COMPILER_COUNT 1
 220 #endif // COMPILER2 || INCLUDE_JVMCI
 221 
 222 #endif // no compilers
 223 
 224 // string type aliases used only in this file
 225 typedef const char* ccstr;
 226 typedef const char* ccstrlist;   // represents string arguments which accumulate
 227 
 228 struct Flag {
 229   enum Flags {
 230     // value origin
 231     DEFAULT          = 0,
 232     COMMAND_LINE     = 1,
 233     ENVIRON_VAR      = 2,
 234     CONFIG_FILE      = 3,
 235     MANAGEMENT       = 4,
 236     ERGONOMIC        = 5,
 237     ATTACH_ON_DEMAND = 6,
 238     INTERNAL         = 7,
 239 
 240     LAST_VALUE_ORIGIN = INTERNAL,
 241     VALUE_ORIGIN_BITS = 4,
 242     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 243 
 244     // flag kind
 245     KIND_PRODUCT            = 1 << 4,
 246     KIND_MANAGEABLE         = 1 << 5,
 247     KIND_DIAGNOSTIC         = 1 << 6,
 248     KIND_EXPERIMENTAL       = 1 << 7,
 249     KIND_NOT_PRODUCT        = 1 << 8,
 250     KIND_DEVELOP            = 1 << 9,
 251     KIND_PLATFORM_DEPENDENT = 1 << 10,
 252     KIND_READ_WRITE         = 1 << 11,
 253     KIND_C1                 = 1 << 12,
 254     KIND_C2                 = 1 << 13,
 255     KIND_ARCH               = 1 << 14,
 256     KIND_SHARK              = 1 << 15,
 257     KIND_LP64_PRODUCT       = 1 << 16,
 258     KIND_COMMERCIAL         = 1 << 17,
 259     KIND_JVMCI              = 1 << 18,
 260 
 261     KIND_MASK = ~VALUE_ORIGIN_MASK
 262   };
 263 
 264   enum Error {
 265     // no error
 266     SUCCESS = 0,
 267     // flag name is missing
 268     MISSING_NAME,
 269     // flag value is missing
 270     MISSING_VALUE,
 271     // error parsing the textual form of the value
 272     WRONG_FORMAT,
 273     // flag is not writeable
 274     NON_WRITABLE,
 275     // flag value is outside of its bounds
 276     OUT_OF_BOUNDS,
 277     // flag value violates its constraint
 278     VIOLATES_CONSTRAINT,
 279     // there is no flag with the given name
 280     INVALID_FLAG,
 281     // other, unspecified error related to setting the flag
 282     ERR_OTHER
 283   };
 284 
 285   enum MsgType {
 286     NONE = 0,
 287     DIAGNOSTIC_FLAG_BUT_LOCKED,
 288     EXPERIMENTAL_FLAG_BUT_LOCKED,
 289     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 290     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 291   };
 292 
 293   const char* _type;
 294   const char* _name;
 295   void* _addr;
 296   NOT_PRODUCT(const char* _doc;)
 297   Flags _flags;
 298 
 299   // points to all Flags static array
 300   static Flag* flags;
 301 
 302   // number of flags
 303   static size_t numFlags;
 304 
 305   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 306   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 307   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 308 
 309   void check_writable();
 310 
 311   bool is_bool() const;
 312   bool get_bool() const;
 313   void set_bool(bool value);
 314 
 315   bool is_int() const;
 316   int get_int() const;
 317   void set_int(int value);
 318 
 319   bool is_uint() const;
 320   uint get_uint() const;
 321   void set_uint(uint value);
 322 
 323   bool is_intx() const;
 324   intx get_intx() const;
 325   void set_intx(intx value);
 326 
 327   bool is_uintx() const;
 328   uintx get_uintx() const;
 329   void set_uintx(uintx value);
 330 
 331   bool is_uint64_t() const;
 332   uint64_t get_uint64_t() const;
 333   void set_uint64_t(uint64_t value);
 334 
 335   bool is_size_t() const;
 336   size_t get_size_t() const;
 337   void set_size_t(size_t value);
 338 
 339   bool is_double() const;
 340   double get_double() const;
 341   void set_double(double value);
 342 
 343   bool is_ccstr() const;
 344   bool ccstr_accumulates() const;
 345   ccstr get_ccstr() const;
 346   void set_ccstr(ccstr value);
 347 
 348   Flags get_origin();
 349   void set_origin(Flags origin);
 350 
 351   bool is_default();
 352   bool is_ergonomic();
 353   bool is_command_line();
 354 
 355   bool is_product() const;
 356   bool is_manageable() const;
 357   bool is_diagnostic() const;
 358   bool is_experimental() const;
 359   bool is_notproduct() const;
 360   bool is_develop() const;
 361   bool is_read_write() const;
 362   bool is_commercial() const;
 363 
 364   bool is_constant_in_binary() const;
 365 
 366   bool is_unlocker() const;
 367   bool is_unlocked() const;
 368   bool is_writeable() const;
 369   bool is_external() const;
 370 
 371   bool is_unlocker_ext() const;
 372   bool is_unlocked_ext() const;
 373   bool is_writeable_ext() const;
 374   bool is_external_ext() const;
 375 
 376   void unlock_diagnostic();
 377 
 378   Flag::MsgType get_locked_message(char*, int) const;
 379   void get_locked_message_ext(char*, int) const;
 380 
 381   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 382   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 383   void print_kind(outputStream* st);
 384   void print_as_flag(outputStream* st);
 385 
 386   static const char* flag_error_str(Flag::Error error);
 387 };
 388 
 389 // debug flags control various aspects of the VM and are global accessible
 390 
 391 // use FlagSetting to temporarily change some debug flag
 392 // e.g. FlagSetting fs(DebugThisAndThat, true);
 393 // restored to previous value upon leaving scope
 394 class FlagSetting {
 395   bool val;
 396   bool* flag;
 397  public:
 398   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 399   ~FlagSetting()                       { *flag = val; }
 400 };
 401 
 402 
 403 class CounterSetting {
 404   intx* counter;
 405  public:
 406   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 407   ~CounterSetting()         { (*counter)--; }
 408 };
 409 
 410 class IntFlagSetting {
 411   int val;
 412   int* flag;
 413  public:
 414   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 415   ~IntFlagSetting()                     { *flag = val; }
 416 };
 417 
 418 class UIntFlagSetting {
 419   uint val;
 420   uint* flag;
 421  public:
 422   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 423   ~UIntFlagSetting()                       { *flag = val; }
 424 };
 425 
 426 class UIntXFlagSetting {
 427   uintx val;
 428   uintx* flag;
 429  public:
 430   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 431   ~UIntXFlagSetting()                         { *flag = val; }
 432 };
 433 
 434 class DoubleFlagSetting {
 435   double val;
 436   double* flag;
 437  public:
 438   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 439   ~DoubleFlagSetting()                           { *flag = val; }
 440 };
 441 
 442 class SizeTFlagSetting {
 443   size_t val;
 444   size_t* flag;
 445  public:
 446   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 447   ~SizeTFlagSetting()                           { *flag = val; }
 448 };
 449 
 450 
 451 class CommandLineFlags {
 452 public:
 453   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 454   static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 455   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 456   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 457 
 458   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 459   static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false)      { return intAt(name, strlen(name), value, allow_locked, return_flag); }
 460   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 461   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 462 
 463   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 464   static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 465   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 466   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 467 
 468   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 469   static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 470   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 471   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 472 
 473   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 474   static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 475   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 476   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 477 
 478   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 479   static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false)    { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
 480   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 481   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 482 
 483   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 484   static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
 485   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 486   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 487 
 488   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 489   static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 490   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 491   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 492 
 493   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 494   static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 495   // Contract:  Flag will make private copy of the incoming value.
 496   // Outgoing value is always malloc-ed, and caller MUST call free.
 497   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 498   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 499 
 500   // Returns false if name is not a command line flag.
 501   static bool wasSetOnCmdline(const char* name, bool* value);
 502   static void printSetFlags(outputStream* out);
 503 
 504   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 505   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 506 
 507   static void verify() PRODUCT_RETURN;
 508 };
 509 
 510 // use this for flags that are true by default in the debug version but
 511 // false in the optimized version, and vice versa
 512 #ifdef ASSERT
 513 #define trueInDebug  true
 514 #define falseInDebug false
 515 #else
 516 #define trueInDebug  false
 517 #define falseInDebug true
 518 #endif
 519 
 520 // use this for flags that are true per default in the product build
 521 // but false in development builds, and vice versa
 522 #ifdef PRODUCT
 523 #define trueInProduct  true
 524 #define falseInProduct false
 525 #else
 526 #define trueInProduct  false
 527 #define falseInProduct true
 528 #endif
 529 
 530 #ifdef JAVASE_EMBEDDED
 531 #define falseInEmbedded false
 532 #else
 533 #define falseInEmbedded true
 534 #endif
 535 
 536 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 537 // product flags are always settable / visible
 538 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 539 
 540 // A flag must be declared with one of the following types:
 541 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 542 // The type "ccstr" is an alias for "const char*" and is used
 543 // only in this file, because the macrology requires single-token type names.
 544 
 545 // Note: Diagnostic options not meant for VM tuning or for product modes.
 546 // They are to be used for VM quality assurance or field diagnosis
 547 // of VM bugs.  They are hidden so that users will not be encouraged to
 548 // try them as if they were VM ordinary execution options.  However, they
 549 // are available in the product version of the VM.  Under instruction
 550 // from support engineers, VM customers can turn them on to collect
 551 // diagnostic information about VM problems.  To use a VM diagnostic
 552 // option, you must first specify +UnlockDiagnosticVMOptions.
 553 // (This master switch also affects the behavior of -Xprintflags.)
 554 //
 555 // experimental flags are in support of features that are not
 556 //    part of the officially supported product, but are available
 557 //    for experimenting with. They could, for example, be performance
 558 //    features that may not have undergone full or rigorous QA, but which may
 559 //    help performance in some cases and released for experimentation
 560 //    by the community of users and developers. This flag also allows one to
 561 //    be able to build a fully supported product that nonetheless also
 562 //    ships with some unsupported, lightly tested, experimental features.
 563 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 564 //    UnlockExperimentalVMOptions flag, which allows the control and
 565 //    modification of the experimental flags.
 566 //
 567 // Nota bene: neither diagnostic nor experimental options should be used casually,
 568 //    and they are not supported on production loads, except under explicit
 569 //    direction from support engineers.
 570 //
 571 // manageable flags are writeable external product flags.
 572 //    They are dynamically writeable through the JDK management interface
 573 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 574 //    These flags are external exported interface (see CCC).  The list of
 575 //    manageable flags can be queried programmatically through the management
 576 //    interface.
 577 //
 578 //    A flag can be made as "manageable" only if
 579 //    - the flag is defined in a CCC as an external exported interface.
 580 //    - the VM implementation supports dynamic setting of the flag.
 581 //      This implies that the VM must *always* query the flag variable
 582 //      and not reuse state related to the flag state at any given time.
 583 //    - you want the flag to be queried programmatically by the customers.
 584 //
 585 // product_rw flags are writeable internal product flags.
 586 //    They are like "manageable" flags but for internal/private use.
 587 //    The list of product_rw flags are internal/private flags which
 588 //    may be changed/removed in a future release.  It can be set
 589 //    through the management interface to get/set value
 590 //    when the name of flag is supplied.
 591 //
 592 //    A flag can be made as "product_rw" only if
 593 //    - the VM implementation supports dynamic setting of the flag.
 594 //      This implies that the VM must *always* query the flag variable
 595 //      and not reuse state related to the flag state at any given time.
 596 //
 597 // Note that when there is a need to support develop flags to be writeable,
 598 // it can be done in the same way as product_rw.
 599 //
 600 // range is a macro that will expand to min and max arguments for range
 601 //    checking code if provided - see commandLineFlagRangeList.hpp
 602 //
 603 // constraint is a macro that will expand to custom function call
 604 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 605 //
 606 
 607 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 608                                                                             \
 609   lp64_product(bool, UseCompressedOops, false,                              \
 610           "Use 32-bit object references in 64-bit VM. "                     \
 611           "lp64_product means flag is always constant in 32 bit VM")        \
 612                                                                             \
 613   lp64_product(bool, UseCompressedClassPointers, false,                     \
 614           "Use 32-bit class pointers in 64-bit VM. "                        \
 615           "lp64_product means flag is always constant in 32 bit VM")        \
 616                                                                             \
 617   notproduct(bool, CheckCompressedOops, true,                               \
 618           "Generate checks in encoding/decoding code in debug VM")          \
 619                                                                             \
 620   product_pd(size_t, HeapBaseMinAddress,                                    \
 621           "OS specific low limit for heap base address")                    \
 622                                                                             \
 623   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 624           "Heap allocation steps through preferred address regions to find" \
 625           " where it can allocate the heap. Number of steps to take per "   \
 626           "region.")                                                        \
 627           range(1, max_uintx)                                               \
 628                                                                             \
 629   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 630           "Print compressed oops base address and encoding mode")           \
 631                                                                             \
 632   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 633           "Default object alignment in bytes, 8 is minimum")                \
 634           range(8, 256)                                                     \
 635           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 636                                                                             \
 637   product(bool, AssumeMP, false,                                            \
 638           "Instruct the VM to assume multiple processors are available")    \
 639                                                                             \
 640   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 641   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 642   /* been re-added (see 6401008)                                         */ \
 643   product_pd(bool, UseMembar,                                               \
 644           "(Unstable) Issues membars on thread state transitions")          \
 645                                                                             \
 646   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 647           "Clean the chunk pool asynchronously")                            \
 648                                                                             \
 649   experimental(bool, AlwaysSafeConstructors, false,                         \
 650           "Force safe construction, as if all fields are final.")           \
 651                                                                             \
 652   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 653           "Enable normal processing of flags relating to field diagnostics")\
 654                                                                             \
 655   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 656           "Enable normal processing of flags relating to experimental "     \
 657           "features")                                                       \
 658                                                                             \
 659   product(bool, JavaMonitorsInStackTrace, true,                             \
 660           "Print information about Java monitor locks when the stacks are"  \
 661           "dumped")                                                         \
 662                                                                             \
 663   product_pd(bool, UseLargePages,                                           \
 664           "Use large page memory")                                          \
 665                                                                             \
 666   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 667           "Allocate large pages individually for better affinity")          \
 668                                                                             \
 669   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 670           "Fail large pages individual allocation")                         \
 671                                                                             \
 672   product(bool, UseLargePagesInMetaspace, false,                            \
 673           "Use large page memory in metaspace. "                            \
 674           "Only used if UseLargePages is enabled.")                         \
 675                                                                             \
 676   develop(bool, TracePageSizes, false,                                      \
 677           "Trace page size selection and usage")                            \
 678                                                                             \
 679   product(bool, UseNUMA, false,                                             \
 680           "Use NUMA if available")                                          \
 681                                                                             \
 682   product(bool, UseNUMAInterleaving, false,                                 \
 683           "Interleave memory across NUMA nodes if available")               \
 684                                                                             \
 685   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 686           "Granularity to use for NUMA interleaving on Windows OS")         \
 687                                                                             \
 688   product(bool, ForceNUMA, false,                                           \
 689           "Force NUMA optimizations on single-node/UMA systems")            \
 690                                                                             \
 691   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 692           "Percentage (0-100) used to weight the current sample when "      \
 693           "computing exponentially decaying average for "                   \
 694           "AdaptiveNUMAChunkSizing")                                        \
 695           range(0, 100)                                                     \
 696                                                                             \
 697   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 698           "Do not reallocate more than this amount per collection")         \
 699                                                                             \
 700   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 701           "Enable adaptive chunk sizing for NUMA")                          \
 702                                                                             \
 703   product(bool, NUMAStats, false,                                           \
 704           "Print NUMA stats in detailed heap information")                  \
 705                                                                             \
 706   product(uintx, NUMAPageScanRate, 256,                                     \
 707           "Maximum number of pages to include in the page scan procedure")  \
 708                                                                             \
 709   product_pd(bool, NeedsDeoptSuspend,                                       \
 710           "True for register window machines (sparc/ia64)")                 \
 711                                                                             \
 712   product(intx, UseSSE, 99,                                                 \
 713           "Highest supported SSE instructions set on x86/x64")              \
 714           range(0, 99)                                                      \
 715                                                                             \
 716   product(bool, UseAES, false,                                              \
 717           "Control whether AES instructions can be used on x86/x64")        \
 718                                                                             \
 719   product(bool, UseSHA, false,                                              \
 720           "Control whether SHA instructions can be used "                   \
 721           "on SPARC and on ARM")                                            \
 722                                                                             \
 723   product(bool, UseGHASHIntrinsics, false,                                  \
 724           "Use intrinsics for GHASH versions of crypto")                    \
 725                                                                             \
 726   product(size_t, LargePageSizeInBytes, 0,                                  \
 727           "Large page size (0 to let VM choose the page size)")             \
 728                                                                             \
 729   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 730           "Use large pages if maximum heap is at least this big")           \
 731                                                                             \
 732   product(bool, ForceTimeHighResolution, false,                             \
 733           "Using high time resolution (for Win32 only)")                    \
 734                                                                             \
 735   develop(bool, TraceItables, false,                                        \
 736           "Trace initialization and use of itables")                        \
 737                                                                             \
 738   develop(bool, TracePcPatching, false,                                     \
 739           "Trace usage of frame::patch_pc")                                 \
 740                                                                             \
 741   develop(bool, TraceJumps, false,                                          \
 742           "Trace assembly jumps in thread ring buffer")                     \
 743                                                                             \
 744   develop(bool, TraceRelocator, false,                                      \
 745           "Trace the bytecode relocator")                                   \
 746                                                                             \
 747   develop(bool, TraceLongCompiles, false,                                   \
 748           "Print out every time compilation is longer than "                \
 749           "a given threshold")                                              \
 750                                                                             \
 751   develop(bool, SafepointALot, false,                                       \
 752           "Generate a lot of safepoints. This works with "                  \
 753           "GuaranteedSafepointInterval")                                    \
 754                                                                             \
 755   product_pd(bool, BackgroundCompilation,                                   \
 756           "A thread requesting compilation is not blocked during "          \
 757           "compilation")                                                    \
 758                                                                             \
 759   product(bool, PrintVMQWaitTime, false,                                    \
 760           "Print out the waiting time in VM operation queue")               \
 761                                                                             \
 762   develop(bool, TraceOopMapGeneration, false,                               \
 763           "Show OopMapGeneration")                                          \
 764                                                                             \
 765   product(bool, MethodFlushing, true,                                       \
 766           "Reclamation of zombie and not-entrant methods")                  \
 767                                                                             \
 768   develop(bool, VerifyStack, false,                                         \
 769           "Verify stack of each thread when it is entering a runtime call") \
 770                                                                             \
 771   diagnostic(bool, ForceUnreachable, false,                                 \
 772           "Make all non code cache addresses to be unreachable by "         \
 773           "forcing use of 64bit literal fixups")                            \
 774                                                                             \
 775   notproduct(bool, StressDerivedPointers, false,                            \
 776           "Force scavenge when a derived pointer is detected on stack "     \
 777           "after rtm call")                                                 \
 778                                                                             \
 779   develop(bool, TraceDerivedPointers, false,                                \
 780           "Trace traversal of derived pointers on stack")                   \
 781                                                                             \
 782   notproduct(bool, TraceCodeBlobStacks, false,                              \
 783           "Trace stack-walk of codeblobs")                                  \
 784                                                                             \
 785   product(bool, PrintJNIResolving, false,                                   \
 786           "Used to implement -v:jni")                                       \
 787                                                                             \
 788   notproduct(bool, PrintRewrites, false,                                    \
 789           "Print methods that are being rewritten")                         \
 790                                                                             \
 791   product(bool, UseInlineCaches, true,                                      \
 792           "Use Inline Caches for virtual calls ")                           \
 793                                                                             \
 794   develop(bool, InlineArrayCopy, true,                                      \
 795           "Inline arraycopy native that is known to be part of "            \
 796           "base library DLL")                                               \
 797                                                                             \
 798   develop(bool, InlineObjectHash, true,                                     \
 799           "Inline Object::hashCode() native that is known to be part "      \
 800           "of base library DLL")                                            \
 801                                                                             \
 802   develop(bool, InlineNatives, true,                                        \
 803           "Inline natives that are known to be part of base library DLL")   \
 804                                                                             \
 805   develop(bool, InlineMathNatives, true,                                    \
 806           "Inline SinD, CosD, etc.")                                        \
 807                                                                             \
 808   develop(bool, InlineClassNatives, true,                                   \
 809           "Inline Class.isInstance, etc")                                   \
 810                                                                             \
 811   develop(bool, InlineThreadNatives, true,                                  \
 812           "Inline Thread.currentThread, etc")                               \
 813                                                                             \
 814   develop(bool, InlineUnsafeOps, true,                                      \
 815           "Inline memory ops (native methods) from Unsafe")                 \
 816                                                                             \
 817   product(bool, CriticalJNINatives, true,                                   \
 818           "Check for critical JNI entry points")                            \
 819                                                                             \
 820   notproduct(bool, StressCriticalJNINatives, false,                         \
 821           "Exercise register saving code in critical natives")              \
 822                                                                             \
 823   product(bool, UseSSE42Intrinsics, false,                                  \
 824           "SSE4.2 versions of intrinsics")                                  \
 825                                                                             \
 826   product(bool, UseAESIntrinsics, false,                                    \
 827           "Use intrinsics for AES versions of crypto")                      \
 828                                                                             \
 829   product(bool, UseSHA1Intrinsics, false,                                   \
 830           "Use intrinsics for SHA-1 crypto hash function. "                 \
 831           "Requires that UseSHA is enabled.")                               \
 832                                                                             \
 833   product(bool, UseSHA256Intrinsics, false,                                 \
 834           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 835           "Requires that UseSHA is enabled.")                               \
 836                                                                             \
 837   product(bool, UseSHA512Intrinsics, false,                                 \
 838           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 839           "Requires that UseSHA is enabled.")                               \
 840                                                                             \
 841   product(bool, UseCRC32Intrinsics, false,                                  \
 842           "use intrinsics for java.util.zip.CRC32")                         \
 843                                                                             \
 844   product(bool, UseCRC32CIntrinsics, false,                                 \
 845           "use intrinsics for java.util.zip.CRC32C")                        \
 846                                                                             \
 847   product(bool, UseAdler32Intrinsics, false,                                \
 848           "use intrinsics for java.util.zip.Adler32")                       \
 849                                                                             \
 850   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 851          "do not expand intrinsics whose (internal) names appear here")     \
 852                                                                             \
 853   develop(bool, TraceCallFixup, false,                                      \
 854           "Trace all call fixups")                                          \
 855                                                                             \
 856   develop(bool, DeoptimizeALot, false,                                      \
 857           "Deoptimize at every exit from the runtime system")               \
 858                                                                             \
 859   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 860           "A comma separated list of bcis to deoptimize at")                \
 861                                                                             \
 862   product(bool, DeoptimizeRandom, false,                                    \
 863           "Deoptimize random frames on random exit from the runtime system")\
 864                                                                             \
 865   notproduct(bool, ZombieALot, false,                                       \
 866           "Create zombies (non-entrant) at exit from the runtime system")   \
 867                                                                             \
 868   product(bool, UnlinkSymbolsALot, false,                                   \
 869           "Unlink unreferenced symbols from the symbol table at safepoints")\
 870                                                                             \
 871   notproduct(bool, WalkStackALot, false,                                    \
 872           "Trace stack (no print) at every exit from the runtime system")   \
 873                                                                             \
 874   product(bool, Debugging, false,                                           \
 875           "Set when executing debug methods in debug.cpp "                  \
 876           "(to prevent triggering assertions)")                             \
 877                                                                             \
 878   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 879           "Enable strict checks that safepoints cannot happen for threads " \
 880           "that use No_Safepoint_Verifier")                                 \
 881                                                                             \
 882   notproduct(bool, VerifyLastFrame, false,                                  \
 883           "Verify oops on last frame on entry to VM")                       \
 884                                                                             \
 885   develop(bool, TraceHandleAllocation, false,                               \
 886           "Print out warnings when suspiciously many handles are allocated")\
 887                                                                             \
 888   product(bool, FailOverToOldVerifier, true,                                \
 889           "Fail over to old verifier when split verifier fails")            \
 890                                                                             \
 891   develop(bool, ShowSafepointMsgs, false,                                   \
 892           "Show message about safepoint synchronization")                   \
 893                                                                             \
 894   product(bool, SafepointTimeout, false,                                    \
 895           "Time out and warn or fail after SafepointTimeoutDelay "          \
 896           "milliseconds if failed to reach safepoint")                      \
 897                                                                             \
 898   develop(bool, DieOnSafepointTimeout, false,                               \
 899           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 900                                                                             \
 901   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 902   /* typically, at most a few retries are needed                    */      \
 903   product(intx, SuspendRetryCount, 50,                                      \
 904           "Maximum retry count for an external suspend request")            \
 905           range(0, max_intx)                                                \
 906                                                                             \
 907   product(intx, SuspendRetryDelay, 5,                                       \
 908           "Milliseconds to delay per retry (* current_retry_count)")        \
 909           range(0, max_intx)                                                \
 910                                                                             \
 911   product(bool, AssertOnSuspendWaitFailure, false,                          \
 912           "Assert/Guarantee on external suspend wait failure")              \
 913                                                                             \
 914   product(bool, TraceSuspendWaitFailures, false,                            \
 915           "Trace external suspend wait failures")                           \
 916                                                                             \
 917   product(bool, MaxFDLimit, true,                                           \
 918           "Bump the number of file descriptors to maximum in Solaris")      \
 919                                                                             \
 920   diagnostic(bool, LogEvents, true,                                         \
 921           "Enable the various ring buffer event logs")                      \
 922                                                                             \
 923   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 924           "Number of ring buffer event logs")                               \
 925           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 926                                                                             \
 927   product(bool, BytecodeVerificationRemote, true,                           \
 928           "Enable the Java bytecode verifier for remote classes")           \
 929                                                                             \
 930   product(bool, BytecodeVerificationLocal, false,                           \
 931           "Enable the Java bytecode verifier for local classes")            \
 932                                                                             \
 933   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 934           "Force exceptions on FP stack under/overflow")                    \
 935                                                                             \
 936   develop(bool, VerifyStackAtCalls, false,                                  \
 937           "Verify that the stack pointer is unchanged after calls")         \
 938                                                                             \
 939   develop(bool, TraceJavaAssertions, false,                                 \
 940           "Trace java language assertions")                                 \
 941                                                                             \
 942   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 943           "Temporary - see javaClasses.cpp")                                \
 944                                                                             \
 945   notproduct(bool, PrintMallocFree, false,                                  \
 946           "Trace calls to C heap malloc/free allocation")                   \
 947                                                                             \
 948   product(bool, PrintOopAddress, false,                                     \
 949           "Always print the location of the oop")                           \
 950                                                                             \
 951   notproduct(bool, VerifyCodeCache, false,                                  \
 952           "Verify code cache on memory allocation/deallocation")            \
 953                                                                             \
 954   develop(bool, UseMallocOnly, false,                                       \
 955           "Use only malloc/free for allocation (no resource area/arena)")   \
 956                                                                             \
 957   develop(bool, PrintMalloc, false,                                         \
 958           "Print all malloc/free calls")                                    \
 959                                                                             \
 960   develop(bool, PrintMallocStatistics, false,                               \
 961           "Print malloc/free statistics")                                   \
 962                                                                             \
 963   develop(bool, ZapResourceArea, trueInDebug,                               \
 964           "Zap freed resource/arena space with 0xABABABAB")                 \
 965                                                                             \
 966   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 967           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 968                                                                             \
 969   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 970           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 971                                                                             \
 972   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 973           "Zap allocated/freed stack segments with 0xFADFADED")             \
 974                                                                             \
 975   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 976           "Zap unused heap space with 0xBAADBABE")                          \
 977                                                                             \
 978   develop(bool, TraceZapUnusedHeapArea, false,                              \
 979           "Trace zapping of unused heap space")                             \
 980                                                                             \
 981   develop(bool, CheckZapUnusedHeapArea, false,                              \
 982           "Check zapping of unused heap space")                             \
 983                                                                             \
 984   develop(bool, ZapFillerObjects, trueInDebug,                              \
 985           "Zap filler objects with 0xDEAFBABE")                             \
 986                                                                             \
 987   develop(bool, PrintVMMessages, true,                                      \
 988           "Print VM messages on console")                                   \
 989                                                                             \
 990   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 991           "Print the time the application has been running")                \
 992                                                                             \
 993   product(bool, PrintGCApplicationStoppedTime, false,                       \
 994           "Print the time the application has been stopped")                \
 995                                                                             \
 996   diagnostic(bool, VerboseVerification, false,                              \
 997           "Display detailed verification details")                          \
 998                                                                             \
 999   notproduct(uintx, ErrorHandlerTest, 0,                                    \
1000           "If > 0, provokes an error after VM initialization; the value "   \
1001           "determines which error to provoke. See test_error_handler() "    \
1002           "in debug.cpp.")                                                  \
1003                                                                             \
1004   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
1005           "If > 0, provokes an error inside VM error handler (a secondary " \
1006           "crash). see test_error_handler() in debug.cpp.")                 \
1007                                                                             \
1008   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1009           "If true, tests SafeFetch inside error handler.")                 \
1010                                                                             \
1011   develop(bool, Verbose, false,                                             \
1012           "Print additional debugging information from other modes")        \
1013                                                                             \
1014   develop(bool, PrintMiscellaneous, false,                                  \
1015           "Print uncategorized debugging information (requires +Verbose)")  \
1016                                                                             \
1017   develop(bool, WizardMode, false,                                          \
1018           "Print much more debugging information")                          \
1019                                                                             \
1020   product(bool, ShowMessageBoxOnError, false,                               \
1021           "Keep process alive on VM fatal error")                           \
1022                                                                             \
1023   product(bool, CreateCoredumpOnCrash, true,                                \
1024           "Create core/mini dump on VM fatal error")                        \
1025                                                                             \
1026   product(uintx, ErrorLogTimeout, 2 * 60,                                   \
1027           "Timeout, in seconds, to limit the time spent on writing an "     \
1028           "error log in case of a crash.")                                  \
1029                                                                             \
1030   product_pd(bool, UseOSErrorReporting,                                     \
1031           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1032                                                                             \
1033   product(bool, SuppressFatalErrorMessage, false,                           \
1034           "Report NO fatal error message (avoid deadlock)")                 \
1035                                                                             \
1036   product(ccstrlist, OnError, "",                                           \
1037           "Run user-defined commands on fatal error; see VMError.cpp "      \
1038           "for examples")                                                   \
1039                                                                             \
1040   product(ccstrlist, OnOutOfMemoryError, "",                                \
1041           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1042                                                                             \
1043   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1044           "Dump heap to file before any major stop-the-world GC")           \
1045                                                                             \
1046   manageable(bool, HeapDumpAfterFullGC, false,                              \
1047           "Dump heap to file after any major stop-the-world GC")            \
1048                                                                             \
1049   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1050           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1051                                                                             \
1052   manageable(ccstr, HeapDumpPath, NULL,                                     \
1053           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1054           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1055           "in the working directory)")                                      \
1056                                                                             \
1057   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1058           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1059           "when the heap usage is larger than this")                        \
1060                                                                             \
1061   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1062           "Approximate segment size when generating a segmented heap dump") \
1063                                                                             \
1064   develop(bool, BreakAtWarning, false,                                      \
1065           "Execute breakpoint upon encountering VM warning")                \
1066                                                                             \
1067   develop(bool, TraceVMOperation, false,                                    \
1068           "Trace VM operations")                                            \
1069                                                                             \
1070   develop(bool, UseFakeTimers, false,                                       \
1071           "Tell whether the VM should use system time or a fake timer")     \
1072                                                                             \
1073   product(ccstr, NativeMemoryTracking, "off",                               \
1074           "Native memory tracking options")                                 \
1075                                                                             \
1076   diagnostic(bool, PrintNMTStatistics, false,                               \
1077           "Print native memory tracking summary data if it is on")          \
1078                                                                             \
1079   diagnostic(bool, LogCompilation, false,                                   \
1080           "Log compilation activity in detail to LogFile")                  \
1081                                                                             \
1082   product(bool, PrintCompilation, false,                                    \
1083           "Print compilations")                                             \
1084                                                                             \
1085   diagnostic(bool, TraceNMethodInstalls, false,                             \
1086           "Trace nmethod installation")                                     \
1087                                                                             \
1088   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1089           "0: do not allow scavengable oops in the code cache; "            \
1090           "1: allow scavenging from the code cache; "                       \
1091           "2: emit as many constants as the compiler can see")              \
1092           range(0, 2)                                                       \
1093                                                                             \
1094   product(bool, AlwaysRestoreFPU, false,                                    \
1095           "Restore the FPU control word after every JNI call (expensive)")  \
1096                                                                             \
1097   diagnostic(bool, PrintCompilation2, false,                                \
1098           "Print additional statistics per compilation")                    \
1099                                                                             \
1100   diagnostic(bool, PrintAdapterHandlers, false,                             \
1101           "Print code generated for i2c/c2i adapters")                      \
1102                                                                             \
1103   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1104           "Verify that i2c/c2i adapters are called properly")               \
1105                                                                             \
1106   develop(bool, VerifyAdapterSharing, false,                                \
1107           "Verify that the code for shared adapters is the equivalent")     \
1108                                                                             \
1109   diagnostic(bool, PrintAssembly, false,                                    \
1110           "Print assembly code (using external disassembler.so)")           \
1111                                                                             \
1112   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1113           "Print options string passed to disassembler.so")                 \
1114                                                                             \
1115   notproduct(bool, PrintNMethodStatistics, false,                           \
1116           "Print a summary statistic for the generated nmethods")           \
1117                                                                             \
1118   diagnostic(bool, PrintNMethods, false,                                    \
1119           "Print assembly code for nmethods when generated")                \
1120                                                                             \
1121   diagnostic(intx, PrintNMethodsAtLevel, -1,                                \
1122           "Only print code for nmethods at the given compilation level")    \
1123                                                                             \
1124   diagnostic(bool, PrintNativeNMethods, false,                              \
1125           "Print assembly code for native nmethods when generated")         \
1126                                                                             \
1127   develop(bool, PrintDebugInfo, false,                                      \
1128           "Print debug information for all nmethods when generated")        \
1129                                                                             \
1130   develop(bool, PrintRelocations, false,                                    \
1131           "Print relocation information for all nmethods when generated")   \
1132                                                                             \
1133   develop(bool, PrintDependencies, false,                                   \
1134           "Print dependency information for all nmethods when generated")   \
1135                                                                             \
1136   develop(bool, PrintExceptionHandlers, false,                              \
1137           "Print exception handler tables for all nmethods when generated") \
1138                                                                             \
1139   develop(bool, StressCompiledExceptionHandlers, false,                     \
1140           "Exercise compiled exception handlers")                           \
1141                                                                             \
1142   develop(bool, InterceptOSException, false,                                \
1143           "Start debugger when an implicit OS (e.g. NULL) "                 \
1144           "exception happens")                                              \
1145                                                                             \
1146   product(bool, PrintCodeCache, false,                                      \
1147           "Print the code cache memory usage when exiting")                 \
1148                                                                             \
1149   develop(bool, PrintCodeCache2, false,                                     \
1150           "Print detailed usage information on the code cache when exiting")\
1151                                                                             \
1152   product(bool, PrintCodeCacheOnCompilation, false,                         \
1153           "Print the code cache memory usage each time a method is "        \
1154           "compiled")                                                       \
1155                                                                             \
1156   diagnostic(bool, PrintStubCode, false,                                    \
1157           "Print generated stub code")                                      \
1158                                                                             \
1159   product(bool, StackTraceInThrowable, true,                                \
1160           "Collect backtrace in throwable when exception happens")          \
1161                                                                             \
1162   product(bool, OmitStackTraceInFastThrow, true,                            \
1163           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1164                                                                             \
1165   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1166           "Print bytecode statistics when dumping profiler output")         \
1167                                                                             \
1168   product(bool, ProfilerRecordPC, false,                                    \
1169           "Collect ticks for each 16 byte interval of compiled code")       \
1170                                                                             \
1171   product(bool, ProfileVM, false,                                           \
1172           "Profile ticks that fall within VM (either in the VM Thread "     \
1173           "or VM code called through stubs)")                               \
1174                                                                             \
1175   product(bool, ProfileIntervals, false,                                    \
1176           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1177                                                                             \
1178   notproduct(bool, ProfilerCheckIntervals, false,                           \
1179           "Collect and print information on spacing of profiler ticks")     \
1180                                                                             \
1181   product(bool, PrintWarnings, true,                                        \
1182           "Print JVM warnings to output stream")                            \
1183                                                                             \
1184   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1185           "Print warnings for stalled SpinLocks")                           \
1186                                                                             \
1187   product(bool, RegisterFinalizersAtInit, true,                             \
1188           "Register finalizable objects at end of Object.<init> or "        \
1189           "after allocation")                                               \
1190                                                                             \
1191   develop(bool, RegisterReferences, true,                                   \
1192           "Tell whether the VM should register soft/weak/final/phantom "    \
1193           "references")                                                     \
1194                                                                             \
1195   develop(bool, IgnoreRewrites, false,                                      \
1196           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1197           "This is unsafe!")                                                \
1198                                                                             \
1199   develop(bool, PrintCodeCacheExtension, false,                             \
1200           "Print extension of code cache")                                  \
1201                                                                             \
1202   develop(bool, UsePrivilegedStack, true,                                   \
1203           "Enable the security JVM functions")                              \
1204                                                                             \
1205   develop(bool, ProtectionDomainVerification, true,                         \
1206           "Verify protection domain before resolution in system dictionary")\
1207                                                                             \
1208   product(bool, ClassUnloading, true,                                       \
1209           "Do unloading of classes")                                        \
1210                                                                             \
1211   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1212           "Do unloading of classes with a concurrent marking cycle")        \
1213                                                                             \
1214   develop(bool, DisableStartThread, false,                                  \
1215           "Disable starting of additional Java threads "                    \
1216           "(for debugging only)")                                           \
1217                                                                             \
1218   develop(bool, MemProfiling, false,                                        \
1219           "Write memory usage profiling to log file")                       \
1220                                                                             \
1221   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1222           "Print the system dictionary at exit")                            \
1223                                                                             \
1224   experimental(intx, PredictedLoadedClassCount, 0,                          \
1225           "Experimental: Tune loaded class cache starting size")            \
1226                                                                             \
1227   diagnostic(bool, UnsyncloadClass, false,                                  \
1228           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1229           "class loader must call VM synchronized for findClass "           \
1230           "and defineClass.")                                               \
1231                                                                             \
1232   product(bool, AlwaysLockClassLoader, false,                               \
1233           "Require the VM to acquire the class loader lock before calling " \
1234           "loadClass() even for class loaders registering "                 \
1235           "as parallel capable")                                            \
1236                                                                             \
1237   product(bool, AllowParallelDefineClass, false,                            \
1238           "Allow parallel defineClass requests for class loaders "          \
1239           "registering as parallel capable")                                \
1240                                                                             \
1241   product(bool, MustCallLoadClassInternal, false,                           \
1242           "Call loadClassInternal() rather than loadClass()")               \
1243                                                                             \
1244   product_pd(bool, DontYieldALot,                                           \
1245           "Throw away obvious excess yield calls")                          \
1246                                                                             \
1247   product_pd(bool, ConvertSleepToYield,                                     \
1248           "Convert sleep(0) to thread yield "                               \
1249           "(may be off for Solaris to improve GUI)")                        \
1250                                                                             \
1251   product(bool, ConvertYieldToSleep, false,                                 \
1252           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1253           "behavior")                                                       \
1254                                                                             \
1255   develop(bool, UseDetachedThreads, true,                                   \
1256           "Use detached threads that are recycled upon termination "        \
1257           "(for Solaris only)")                                             \
1258                                                                             \
1259   product(bool, UseLWPSynchronization, true,                                \
1260           "Use LWP-based instead of libthread-based synchronization "       \
1261           "(SPARC only)")                                                   \
1262                                                                             \
1263   experimental(ccstr, SyncKnobs, NULL,                                      \
1264                "(Unstable) Various monitor synchronization tunables")       \
1265                                                                             \
1266   experimental(intx, EmitSync, 0,                                           \
1267                "(Unsafe, Unstable) "                                        \
1268                "Control emission of inline sync fast-path code")            \
1269                                                                             \
1270   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1271           range(0, max_jint)                                                \
1272                                                                             \
1273   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1274                                                                             \
1275   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1276                "Experimental Sync flags")                                   \
1277                                                                             \
1278   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1279                                                                             \
1280   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1281                                                                             \
1282   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1283                                                                             \
1284   experimental(intx, hashCode, 5,                                           \
1285                "(Unstable) select hashCode generation algorithm")           \
1286                                                                             \
1287   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1288                "(Unstable, Linux-specific) "                                \
1289                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1290                                                                             \
1291   product(bool, FilterSpuriousWakeups, true,                                \
1292           "When true prevents OS-level spurious, or premature, wakeups "    \
1293           "from Object.wait (Ignored for Windows)")                         \
1294                                                                             \
1295   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1296                                                                             \
1297   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1298                                                                             \
1299   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1300                                                                             \
1301   develop(bool, UsePthreads, false,                                         \
1302           "Use pthread-based instead of libthread-based synchronization "   \
1303           "(SPARC only)")                                                   \
1304                                                                             \
1305   product(bool, ReduceSignalUsage, false,                                   \
1306           "Reduce the use of OS signals in Java and/or the VM")             \
1307                                                                             \
1308   develop_pd(bool, ShareVtableStubs,                                        \
1309           "Share vtable stubs (smaller code but worse branch prediction")   \
1310                                                                             \
1311   develop(bool, LoadLineNumberTables, true,                                 \
1312           "Tell whether the class file parser loads line number tables")    \
1313                                                                             \
1314   develop(bool, LoadLocalVariableTables, true,                              \
1315           "Tell whether the class file parser loads local variable tables") \
1316                                                                             \
1317   develop(bool, LoadLocalVariableTypeTables, true,                          \
1318           "Tell whether the class file parser loads local variable type"    \
1319           "tables")                                                         \
1320                                                                             \
1321   product(bool, AllowUserSignalHandlers, false,                             \
1322           "Do not complain if the application installs signal handlers "    \
1323           "(Solaris & Linux only)")                                         \
1324                                                                             \
1325   product(bool, UseSignalChaining, true,                                    \
1326           "Use signal-chaining to invoke signal handlers installed "        \
1327           "by the application (Solaris & Linux only)")                      \
1328                                                                             \
1329   product(bool, UseAltSigs, false,                                          \
1330           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1331           "internal signals (Solaris only)")                                \
1332                                                                             \
1333   product(bool, AllowJNIEnvProxy, false,                                    \
1334           "Allow JNIEnv proxies for jdbx")                                  \
1335                                                                             \
1336   product(bool, RestoreMXCSROnJNICalls, false,                              \
1337           "Restore MXCSR when returning from JNI calls")                    \
1338                                                                             \
1339   product(bool, CheckJNICalls, false,                                       \
1340           "Verify all arguments to JNI calls")                              \
1341                                                                             \
1342   product(bool, CheckEndorsedAndExtDirs, false,                             \
1343           "Verify the endorsed and extension directories are not used")     \
1344                                                                             \
1345   product(bool, UseFastJNIAccessors, true,                                  \
1346           "Use optimized versions of Get<Primitive>Field")                  \
1347                                                                             \
1348   product(intx, MaxJNILocalCapacity, 65536,                                 \
1349           "Maximum allowable local JNI handle capacity to "                 \
1350           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1351           "where <= 0 is unlimited, default: 65536")                        \
1352           range(min_intx, max_intx)                                         \
1353                                                                             \
1354   product(bool, EagerXrunInit, false,                                       \
1355           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1356           "but not all -Xrun libraries may support the state of the VM "    \
1357           "at this time")                                                   \
1358                                                                             \
1359   product(bool, PreserveAllAnnotations, false,                              \
1360           "Preserve RuntimeInvisibleAnnotations as well "                   \
1361           "as RuntimeVisibleAnnotations")                                   \
1362                                                                             \
1363   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1364           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1365                                                                             \
1366   product(bool, UseXMMForArrayCopy, false,                                  \
1367           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1368                                                                             \
1369   product(intx, FieldsAllocationStyle, 1,                                   \
1370           "0 - type based with oops first, "                                \
1371           "1 - with oops last, "                                            \
1372           "2 - oops in super and sub classes are together")                 \
1373           range(0, 2)                                                       \
1374                                                                             \
1375   product(bool, CompactFields, true,                                        \
1376           "Allocate nonstatic fields in gaps between previous fields")      \
1377                                                                             \
1378   notproduct(bool, PrintFieldLayout, false,                                 \
1379           "Print field layout for each class")                              \
1380                                                                             \
1381   /* Need to limit the extent of the padding to reasonable size.          */\
1382   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1383   /* aggressive prefetching, while still leaving the room for segregating */\
1384   /* among the distinct pages.                                            */\
1385   product(intx, ContendedPaddingWidth, 128,                                 \
1386           "How many bytes to pad the fields/classes marked @Contended with")\
1387           range(0, 8192)                                                    \
1388           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1389                                                                             \
1390   product(bool, EnableContended, true,                                      \
1391           "Enable @Contended annotation support")                           \
1392                                                                             \
1393   product(bool, RestrictContended, true,                                    \
1394           "Restrict @Contended to trusted classes")                         \
1395                                                                             \
1396   product(bool, UseBiasedLocking, true,                                     \
1397           "Enable biased locking in JVM")                                   \
1398                                                                             \
1399   product(intx, BiasedLockingStartupDelay, 4000,                            \
1400           "Number of milliseconds to wait before enabling biased locking")  \
1401           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1402           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1403                                                                             \
1404   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1405           "Print statistics of biased locking in JVM")                      \
1406                                                                             \
1407   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1408           "Threshold of number of revocations per type to try to "          \
1409           "rebias all objects in the heap of that type")                    \
1410           range(0, max_intx)                                                \
1411           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1412                                                                             \
1413   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1414           "Threshold of number of revocations per type to permanently "     \
1415           "revoke biases of all objects in the heap of that type")          \
1416           range(0, max_intx)                                                \
1417           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1418                                                                             \
1419   product(intx, BiasedLockingDecayTime, 25000,                              \
1420           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1421           "type after previous bulk rebias")                                \
1422           range(500, max_intx)                                              \
1423           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1424                                                                             \
1425   /* tracing */                                                             \
1426                                                                             \
1427   notproduct(bool, TraceRuntimeCalls, false,                                \
1428           "Trace run-time calls")                                           \
1429                                                                             \
1430   develop(bool, TraceJNICalls, false,                                       \
1431           "Trace JNI calls")                                                \
1432                                                                             \
1433   develop(bool, StressRewriter, false,                                      \
1434           "Stress linktime bytecode rewriting")                             \
1435                                                                             \
1436   notproduct(bool, TraceJVMCalls, false,                                    \
1437           "Trace JVM calls")                                                \
1438                                                                             \
1439   product(ccstr, TraceJVMTI, NULL,                                          \
1440           "Trace flags for JVMTI functions and events")                     \
1441                                                                             \
1442   /* This option can change an EMCP method into an obsolete method. */      \
1443   /* This can affect tests that except specific methods to be EMCP. */      \
1444   /* This option should be used with caution.                       */      \
1445   product(bool, StressLdcRewrite, false,                                    \
1446           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1447                                                                             \
1448   product(uintx, TraceRedefineClasses, 0,                                   \
1449           "Trace level for JVMTI RedefineClasses")                          \
1450           range(0, 0xFFFFFFFF)                                              \
1451                                                                             \
1452   /* change to false by default sometime after Mustang */                   \
1453   product(bool, VerifyMergedCPBytecodes, true,                              \
1454           "Verify bytecodes after RedefineClasses constant pool merging")   \
1455                                                                             \
1456   develop(bool, TraceJNIHandleAllocation, false,                            \
1457           "Trace allocation/deallocation of JNI handle blocks")             \
1458                                                                             \
1459   develop(bool, TraceBytecodes, false,                                      \
1460           "Trace bytecode execution")                                       \
1461                                                                             \
1462   develop(bool, TraceClassInitialization, false,                            \
1463           "Trace class initialization")                                     \
1464                                                                             \
1465   product(bool, TraceExceptions, false,                                     \
1466           "Trace exceptions")                                               \
1467                                                                             \
1468   develop(bool, TraceICs, false,                                            \
1469           "Trace inline cache changes")                                     \
1470                                                                             \
1471   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1472           "Trace method invocation counter overflow")                       \
1473                                                                             \
1474   develop(bool, TraceInlineCacheClearing, false,                            \
1475           "Trace clearing of inline caches in nmethods")                    \
1476                                                                             \
1477   develop(bool, TraceDependencies, false,                                   \
1478           "Trace dependencies")                                             \
1479                                                                             \
1480   develop(bool, VerifyDependencies, trueInDebug,                            \
1481           "Exercise and verify the compilation dependency mechanism")       \
1482                                                                             \
1483   develop(bool, TraceNewOopMapGeneration, false,                            \
1484           "Trace OopMapGeneration")                                         \
1485                                                                             \
1486   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1487           "Trace OopMapGeneration: print detailed cell states")             \
1488                                                                             \
1489   develop(bool, TimeOopMap, false,                                          \
1490           "Time calls to GenerateOopMap::compute_map() in sum")             \
1491                                                                             \
1492   develop(bool, TimeOopMap2, false,                                         \
1493           "Time calls to GenerateOopMap::compute_map() individually")       \
1494                                                                             \
1495   develop(bool, TraceMonitorMismatch, false,                                \
1496           "Trace monitor matching failures during OopMapGeneration")        \
1497                                                                             \
1498   develop(bool, TraceOopMapRewrites, false,                                 \
1499           "Trace rewriting of method oops during oop map generation")       \
1500                                                                             \
1501   develop(bool, TraceSafepoint, false,                                      \
1502           "Trace safepoint operations")                                     \
1503                                                                             \
1504   develop(bool, TraceICBuffer, false,                                       \
1505           "Trace usage of IC buffer")                                       \
1506                                                                             \
1507   develop(bool, TraceCompiledIC, false,                                     \
1508           "Trace changes of compiled IC")                                   \
1509                                                                             \
1510   develop(bool, TraceStartupTime, false,                                    \
1511           "Trace setup time")                                               \
1512                                                                             \
1513   develop(bool, TraceProtectionDomainVerification, false,                   \
1514           "Trace protection domain verification")                           \
1515                                                                             \
1516   develop(bool, TraceClearedExceptions, false,                              \
1517           "Print when an exception is forcibly cleared")                    \
1518                                                                             \
1519   product(bool, TraceClassResolution, false,                                \
1520           "Trace all constant pool resolutions (for debugging)")            \
1521                                                                             \
1522   product(bool, TraceBiasedLocking, false,                                  \
1523           "Trace biased locking in JVM")                                    \
1524                                                                             \
1525   product(bool, TraceMonitorInflation, false,                               \
1526           "Trace monitor inflation in JVM")                                 \
1527                                                                             \
1528   /* gc */                                                                  \
1529                                                                             \
1530   product(bool, UseSerialGC, false,                                         \
1531           "Use the Serial garbage collector")                               \
1532                                                                             \
1533   product(bool, UseG1GC, false,                                             \
1534           "Use the Garbage-First garbage collector")                        \
1535                                                                             \
1536   product(bool, UseParallelGC, false,                                       \
1537           "Use the Parallel Scavenge garbage collector")                    \
1538                                                                             \
1539   product(bool, UseParallelOldGC, false,                                    \
1540           "Use the Parallel Old garbage collector")                         \
1541                                                                             \
1542   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1543           "How often should we maximally compact the heap (not allowing "   \
1544           "any dead space)")                                                \
1545                                                                             \
1546   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1547           "The collection count for the first maximum compaction")          \
1548                                                                             \
1549   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1550           "Use maximum compaction in the Parallel Old garbage collector "   \
1551           "for a system GC")                                                \
1552                                                                             \
1553   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1554           "The mean used by the parallel compact dead wood "                \
1555           "limiter (a number between 0-100)")                               \
1556           range(0, 100)                                                     \
1557                                                                             \
1558   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1559           "The standard deviation used by the parallel compact dead wood "  \
1560           "limiter (a number between 0-100)")                               \
1561           range(0, 100)                                                     \
1562                                                                             \
1563   product(uint, ParallelGCThreads, 0,                                       \
1564           "Number of parallel threads parallel gc will use")                \
1565           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1566                                                                             \
1567   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1568             "Use semaphore synchronization for the GC Threads, "            \
1569             "instead of synchronization based on mutexes")                  \
1570                                                                             \
1571   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1572           "Dynamically choose the number of parallel threads "              \
1573           "parallel gc will use")                                           \
1574                                                                             \
1575   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1576           "Force dynamic selection of the number of "                       \
1577           "parallel threads parallel gc will use to aid debugging")         \
1578                                                                             \
1579   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1580           "Size of heap (bytes) per GC thread used in calculating the "     \
1581           "number of GC threads")                                           \
1582           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1583                                                                             \
1584   product(bool, TraceDynamicGCThreads, false,                               \
1585           "Trace the dynamic GC thread usage")                              \
1586                                                                             \
1587   product(uint, ConcGCThreads, 0,                                           \
1588           "Number of threads concurrent gc will use")                       \
1589           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1590                                                                             \
1591   product(uintx, GCTaskTimeStampEntries, 200,                               \
1592           "Number of time stamp entries per gc worker thread")              \
1593           range(1, max_uintx)                                               \
1594                                                                             \
1595   product(bool, AlwaysTenure, false,                                        \
1596           "Always tenure objects in eden (ParallelGC only)")                \
1597                                                                             \
1598   product(bool, NeverTenure, false,                                         \
1599           "Never tenure objects in eden, may tenure on overflow "           \
1600           "(ParallelGC only)")                                              \
1601                                                                             \
1602   product(bool, ScavengeBeforeFullGC, true,                                 \
1603           "Scavenge youngest generation before each full GC.")              \
1604                                                                             \
1605   product(bool, UseConcMarkSweepGC, false,                                  \
1606           "Use Concurrent Mark-Sweep GC in the old generation")             \
1607                                                                             \
1608   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1609           "A System.gc() request invokes a concurrent collection; "         \
1610           "(effective only when using concurrent collectors)")              \
1611                                                                             \
1612   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1613           "A System.gc() request invokes a concurrent collection and "      \
1614           "also unloads classes during such a concurrent gc cycle "         \
1615           "(effective only when UseConcMarkSweepGC)")                       \
1616                                                                             \
1617   product(bool, GCLockerInvokesConcurrent, false,                           \
1618           "The exit of a JNI critical section necessitating a scavenge, "   \
1619           "also kicks off a background concurrent collection")              \
1620                                                                             \
1621   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1622           "How much the GC can expand the eden by while the GC locker "     \
1623           "is active (as a percentage)")                                    \
1624           range(0, 100)                                                     \
1625                                                                             \
1626   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1627           "Number of times to retry allocations when "                      \
1628           "blocked by the GC locker")                                       \
1629                                                                             \
1630   product(bool, UseCMSBestFit, true,                                        \
1631           "Use CMS best fit allocation strategy")                           \
1632                                                                             \
1633   product(bool, UseParNewGC, false,                                         \
1634           "Use parallel threads in the new generation")                     \
1635                                                                             \
1636   product(bool, PrintTaskqueue, false,                                      \
1637           "Print taskqueue statistics for parallel collectors")             \
1638                                                                             \
1639   product(bool, PrintTerminationStats, false,                               \
1640           "Print termination statistics for parallel collectors")           \
1641                                                                             \
1642   product(uintx, ParallelGCBufferWastePct, 10,                              \
1643           "Wasted fraction of parallel allocation buffer")                  \
1644           range(0, 100)                                                     \
1645                                                                             \
1646   product(uintx, TargetPLABWastePct, 10,                                    \
1647           "Target wasted space in last buffer as percent of overall "       \
1648           "allocation")                                                     \
1649           range(1, 100)                                                     \
1650                                                                             \
1651   product(uintx, PLABWeight, 75,                                            \
1652           "Percentage (0-100) used to weight the current sample when "      \
1653           "computing exponentially decaying average for ResizePLAB")        \
1654           range(0, 100)                                                     \
1655                                                                             \
1656   product(bool, ResizePLAB, true,                                           \
1657           "Dynamically resize (survivor space) promotion LAB's")            \
1658                                                                             \
1659   product(bool, PrintPLAB, false,                                           \
1660           "Print (survivor space) promotion LAB's sizing decisions")        \
1661                                                                             \
1662   product(intx, ParGCArrayScanChunk, 50,                                    \
1663           "Scan a subset of object array and push remainder, if array is "  \
1664           "bigger than this")                                               \
1665           range(1, max_intx)                                                \
1666                                                                             \
1667   product(bool, ParGCUseLocalOverflow, false,                               \
1668           "Instead of a global overflow list, use local overflow stacks")   \
1669                                                                             \
1670   product(bool, ParGCTrimOverflow, true,                                    \
1671           "Eagerly trim the local overflow lists "                          \
1672           "(when ParGCUseLocalOverflow)")                                   \
1673                                                                             \
1674   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1675           "Simulate work queue overflow in ParNew")                         \
1676                                                                             \
1677   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1678           "An `interval' counter that determines how frequently "           \
1679           "we simulate overflow; a smaller number increases frequency")     \
1680                                                                             \
1681   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1682           "The desired number of objects to claim from the overflow list")  \
1683                                                                             \
1684   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1685           "The number of strides per worker thread that we divide up the "  \
1686           "card table scanning work into")                                  \
1687           range(1, max_uintx)                                               \
1688           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1689                                                                             \
1690   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1691           "The number of cards in each chunk of the parallel chunks used "  \
1692           "during card table scanning")                                     \
1693           range(1, max_intx)                                                \
1694                                                                             \
1695   product(uintx, OldPLABWeight, 50,                                         \
1696           "Percentage (0-100) used to weight the current sample when "      \
1697           "computing exponentially decaying average for resizing "          \
1698           "OldPLABSize")                                                    \
1699           range(0, 100)                                                     \
1700                                                                             \
1701   product(bool, ResizeOldPLAB, true,                                        \
1702           "Dynamically resize (old gen) promotion LAB's")                   \
1703                                                                             \
1704   product(bool, PrintOldPLAB, false,                                        \
1705           "Print (old gen) promotion LAB's sizing decisions")               \
1706                                                                             \
1707   product(size_t, CMSOldPLABMax, 1024,                                      \
1708           "Maximum size of CMS gen promotion LAB caches per worker "        \
1709           "per block size")                                                 \
1710           range(1, max_uintx)                                               \
1711           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1712                                                                             \
1713   product(size_t, CMSOldPLABMin, 16,                                        \
1714           "Minimum size of CMS gen promotion LAB caches per worker "        \
1715           "per block size")                                                 \
1716           range(1, max_uintx)                                               \
1717           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1718                                                                             \
1719   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1720           "Nominal number of refills of CMS gen promotion LAB cache "       \
1721           "per worker per block size")                                      \
1722           range(1, max_uintx)                                               \
1723                                                                             \
1724   product(bool, CMSOldPLABResizeQuicker, false,                             \
1725           "React on-the-fly during a scavenge to a sudden "                 \
1726           "change in block demand rate")                                    \
1727                                                                             \
1728   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1729           "The tolerance of the phase-change detector for on-the-fly "      \
1730           "PLAB resizing during a scavenge")                                \
1731           range(1, max_uintx)                                               \
1732                                                                             \
1733   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1734           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1735           "during a scavenge")                                              \
1736                                                                             \
1737   product(bool, AlwaysPreTouch, false,                                      \
1738           "Force all freshly committed pages to be pre-touched")            \
1739                                                                             \
1740   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1741           "The maximum size of young gen chosen by default per GC worker "  \
1742           "thread available")                                               \
1743           range(1, max_uintx)                                               \
1744                                                                             \
1745   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1746           "Percentage (0-100) used to add conservatism when computing the " \
1747           "duty cycle")                                                     \
1748           range(0, 100)                                                     \
1749                                                                             \
1750   product(uintx, CMSExpAvgFactor, 50,                                       \
1751           "Percentage (0-100) used to weight the current sample when "      \
1752           "computing exponential averages for CMS statistics")              \
1753           range(0, 100)                                                     \
1754                                                                             \
1755   product(uintx, CMS_FLSWeight, 75,                                         \
1756           "Percentage (0-100) used to weight the current sample when "      \
1757           "computing exponentially decaying averages for CMS FLS "          \
1758           "statistics")                                                     \
1759           range(0, 100)                                                     \
1760                                                                             \
1761   product(uintx, CMS_FLSPadding, 1,                                         \
1762           "The multiple of deviation from mean to use for buffering "       \
1763           "against volatility in free list demand")                         \
1764                                                                             \
1765   product(uintx, FLSCoalescePolicy, 2,                                      \
1766           "CMS: aggressiveness level for coalescing, increasing "           \
1767           "from 0 to 4")                                                    \
1768           range(0, 4)                                                       \
1769                                                                             \
1770   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1771           "CMS: larger free blocks are always available for coalescing")    \
1772                                                                             \
1773   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1774           "CMS: the smaller the percentage the greater the coalescing "     \
1775           "force")                                                          \
1776           range(0.0, 1.0)                                                   \
1777                                                                             \
1778   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1779           "CMS: the factor by which to inflate estimated demand of small "  \
1780           "block sizes to prevent coalescing with an adjoining block")      \
1781           range(0.0, DBL_MAX)                                               \
1782                                                                             \
1783   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1784           "CMS: the factor by which to inflate estimated demand of large "  \
1785           "block sizes to prevent coalescing with an adjoining block")      \
1786           range(0.0, DBL_MAX)                                               \
1787                                                                             \
1788   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1789           "CMS: the factor by which to inflate estimated demand of small "  \
1790           "block sizes to prevent splitting to supply demand for smaller "  \
1791           "blocks")                                                         \
1792           range(0.0, DBL_MAX)                                               \
1793                                                                             \
1794   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1795           "CMS: the factor by which to inflate estimated demand of large "  \
1796           "block sizes to prevent splitting to supply demand for smaller "  \
1797           "blocks")                                                         \
1798           range(0.0, DBL_MAX)                                               \
1799                                                                             \
1800   product(bool, CMSExtrapolateSweep, false,                                 \
1801           "CMS: cushion for block demand during sweep")                     \
1802                                                                             \
1803   product(uintx, CMS_SweepWeight, 75,                                       \
1804           "Percentage (0-100) used to weight the current sample when "      \
1805           "computing exponentially decaying average for inter-sweep "       \
1806           "duration")                                                       \
1807           range(0, 100)                                                     \
1808                                                                             \
1809   product(uintx, CMS_SweepPadding, 1,                                       \
1810           "The multiple of deviation from mean to use for buffering "       \
1811           "against volatility in inter-sweep duration")                     \
1812                                                                             \
1813   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1814           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1815           "duration exceeds this threshold in milliseconds")                \
1816                                                                             \
1817   product(bool, CMSClassUnloadingEnabled, true,                             \
1818           "Whether class unloading enabled when using CMS GC")              \
1819                                                                             \
1820   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1821           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1822           "count for which classes may not be unloaded")                    \
1823                                                                             \
1824   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1825           "Replenish an indexed free list with this number of chunks")      \
1826           range(1, max_uintx)                                               \
1827                                                                             \
1828   product(bool, CMSReplenishIntermediate, true,                             \
1829           "Replenish all intermediate free-list caches")                    \
1830                                                                             \
1831   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1832           "When satisfying batched demand, split blocks from the "          \
1833           "IndexedFreeList whose size is a multiple of requested size")     \
1834                                                                             \
1835   product(bool, CMSLoopWarn, false,                                         \
1836           "Warn in case of excessive CMS looping")                          \
1837                                                                             \
1838   /* where does the range max value of (max_jint - 1) come from? */         \
1839   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1840           "Maximum size of marking stack")                                  \
1841           range(1, (max_jint - 1))                                          \
1842                                                                             \
1843   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1844           "Size of marking stack")                                          \
1845           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1846                                                                             \
1847   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1848           "Simulate frequent marking stack / work queue overflow")          \
1849                                                                             \
1850   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1851           "An \"interval\" counter that determines how frequently "         \
1852           "to simulate overflow; a smaller number increases frequency")     \
1853                                                                             \
1854   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1855           "Maximum number of abortable preclean iterations, if > 0")        \
1856                                                                             \
1857   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1858           "Maximum time in abortable preclean (in milliseconds)")           \
1859           range(0, max_intx)                                                \
1860                                                                             \
1861   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1862           "Nominal minimum work per abortable preclean iteration")          \
1863                                                                             \
1864   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1865           "Time that we sleep between iterations when not given "           \
1866           "enough work per iteration")                                      \
1867           range(0, max_intx)                                                \
1868                                                                             \
1869   product(size_t, CMSRescanMultiple, 32,                                    \
1870           "Size (in cards) of CMS parallel rescan task")                    \
1871           range(1, max_uintx)                                               \
1872                                                                             \
1873   product(size_t, CMSConcMarkMultiple, 32,                                  \
1874           "Size (in cards) of CMS concurrent MT marking task")              \
1875           range(1, max_uintx)                                               \
1876                                                                             \
1877   product(bool, CMSAbortSemantics, false,                                   \
1878           "Whether abort-on-overflow semantics is implemented")             \
1879                                                                             \
1880   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1881           "Use the parallel initial mark.")                                 \
1882                                                                             \
1883   product(bool, CMSParallelRemarkEnabled, true,                             \
1884           "Whether parallel remark enabled (only if ParNewGC)")             \
1885                                                                             \
1886   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1887           "Whether parallel remark of survivor space "                      \
1888           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1889                                                                             \
1890   product(bool, CMSPLABRecordAlways, true,                                  \
1891           "Always record survivor space PLAB boundaries (effective only "   \
1892           "if CMSParallelSurvivorRemarkEnabled)")                           \
1893                                                                             \
1894   product(bool, CMSEdenChunksRecordAlways, true,                            \
1895           "Always record eden chunks used for the parallel initial mark "   \
1896           "or remark of eden")                                              \
1897                                                                             \
1898   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1899           "Print the eden and the survivor chunks used for the parallel "   \
1900           "initial mark or remark of the eden/survivor spaces")             \
1901                                                                             \
1902   product(bool, CMSConcurrentMTEnabled, true,                               \
1903           "Whether multi-threaded concurrent work enabled "                 \
1904           "(effective only if ParNewGC)")                                   \
1905                                                                             \
1906   product(bool, CMSPrecleaningEnabled, true,                                \
1907           "Whether concurrent precleaning enabled")                         \
1908                                                                             \
1909   product(uintx, CMSPrecleanIter, 3,                                        \
1910           "Maximum number of precleaning iteration passes")                 \
1911           range(0, 9)                                                       \
1912                                                                             \
1913   product(uintx, CMSPrecleanDenominator, 3,                                 \
1914           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1915           "ratio")                                                          \
1916           range(1, max_uintx)                                               \
1917           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1918                                                                             \
1919   product(uintx, CMSPrecleanNumerator, 2,                                   \
1920           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1921           "ratio")                                                          \
1922           range(0, max_uintx-1)                                             \
1923           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1924                                                                             \
1925   product(bool, CMSPrecleanRefLists1, true,                                 \
1926           "Preclean ref lists during (initial) preclean phase")             \
1927                                                                             \
1928   product(bool, CMSPrecleanRefLists2, false,                                \
1929           "Preclean ref lists during abortable preclean phase")             \
1930                                                                             \
1931   product(bool, CMSPrecleanSurvivors1, false,                               \
1932           "Preclean survivors during (initial) preclean phase")             \
1933                                                                             \
1934   product(bool, CMSPrecleanSurvivors2, true,                                \
1935           "Preclean survivors during abortable preclean phase")             \
1936                                                                             \
1937   product(uintx, CMSPrecleanThreshold, 1000,                                \
1938           "Do not iterate again if number of dirty cards is less than this")\
1939           range(100, max_uintx)                                             \
1940                                                                             \
1941   product(bool, CMSCleanOnEnter, true,                                      \
1942           "Clean-on-enter optimization for reducing number of dirty cards") \
1943                                                                             \
1944   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1945           "Choose variant (1,2) of verification following remark")          \
1946           range(1, 2)                                                       \
1947                                                                             \
1948   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1949           "If Eden size is below this, do not try to schedule remark")      \
1950                                                                             \
1951   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1952           "The Eden occupancy percentage (0-100) at which "                 \
1953           "to try and schedule remark pause")                               \
1954           range(0, 100)                                                     \
1955                                                                             \
1956   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1957           "Start sampling eden top at least before young gen "              \
1958           "occupancy reaches 1/<ratio> of the size at which "               \
1959           "we plan to schedule remark")                                     \
1960           range(1, max_uintx)                                               \
1961                                                                             \
1962   product(uintx, CMSSamplingGrain, 16*K,                                    \
1963           "The minimum distance between eden samples for CMS (see above)")  \
1964           range(1, max_uintx)                                               \
1965                                                                             \
1966   product(bool, CMSScavengeBeforeRemark, false,                             \
1967           "Attempt scavenge before the CMS remark step")                    \
1968                                                                             \
1969   develop(bool, CMSTraceSweeper, false,                                     \
1970           "Trace some actions of the CMS sweeper")                          \
1971                                                                             \
1972   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1973           "Don't drain below this size per parallel worker/thief")          \
1974           range(1, max_juint)                                               \
1975           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1976                                                                             \
1977   manageable(intx, CMSWaitDuration, 2000,                                   \
1978           "Time in milliseconds that CMS thread waits for young GC")        \
1979                                                                             \
1980   develop(uintx, CMSCheckInterval, 1000,                                    \
1981           "Interval in milliseconds that CMS thread checks if it "          \
1982           "should start a collection cycle")                                \
1983                                                                             \
1984   product(bool, CMSYield, true,                                             \
1985           "Yield between steps of CMS")                                     \
1986                                                                             \
1987   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1988           "Bitmap operations should process at most this many bits "        \
1989           "between yields")                                                 \
1990           range(1, max_uintx)                                               \
1991                                                                             \
1992   product(bool, CMSDumpAtPromotionFailure, false,                           \
1993           "Dump useful information about the state of the CMS old "         \
1994           "generation upon a promotion failure")                            \
1995                                                                             \
1996   product(bool, CMSPrintChunksInDump, false,                                \
1997           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1998           "more detailed information about the free chunks")                \
1999                                                                             \
2000   product(bool, CMSPrintObjectsInDump, false,                               \
2001           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2002           "more detailed information about the allocated objects")          \
2003                                                                             \
2004   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
2005           "Verify that all references across the FLS boundary "             \
2006           "are to valid objects")                                           \
2007                                                                             \
2008   diagnostic(bool, FLSVerifyLists, false,                                   \
2009           "Do lots of (expensive) FreeListSpace verification")              \
2010                                                                             \
2011   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2012           "Do lots of (expensive) FLS index table verification")            \
2013                                                                             \
2014   develop(bool, FLSVerifyDictionary, false,                                 \
2015           "Do lots of (expensive) FLS dictionary verification")             \
2016                                                                             \
2017   develop(bool, VerifyBlockOffsetArray, false,                              \
2018           "Do (expensive) block offset array verification")                 \
2019                                                                             \
2020   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2021           "Maintain _unallocated_block in BlockOffsetArray "                \
2022           "(currently applicable only to CMS collector)")                   \
2023                                                                             \
2024   develop(bool, TraceCMSState, false,                                       \
2025           "Trace the state of the CMS collection")                          \
2026                                                                             \
2027   product(intx, RefDiscoveryPolicy, 0,                                      \
2028           "Select type of reference discovery policy: "                     \
2029           "reference-based(0) or referent-based(1)")                        \
2030           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2031                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2032                                                                             \
2033   product(bool, ParallelRefProcEnabled, false,                              \
2034           "Enable parallel reference processing whenever possible")         \
2035                                                                             \
2036   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2037           "Enable balancing of reference processing queues")                \
2038                                                                             \
2039   product(uintx, CMSTriggerRatio, 80,                                       \
2040           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2041           "allocated before a CMS collection cycle commences")              \
2042           range(0, 100)                                                     \
2043                                                                             \
2044   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2045           "Percentage CMS generation occupancy at which to "                \
2046           "initiate CMS collection for bootstrapping collection stats")     \
2047           range(0, 100)                                                     \
2048                                                                             \
2049   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2050           "Percentage CMS generation occupancy to start a CMS collection "  \
2051           "cycle. A negative value means that CMSTriggerRatio is used")     \
2052           range(min_intx, 100)                                              \
2053                                                                             \
2054   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2055           "Percentage of the (entire) heap occupancy to start a "           \
2056           "concurrent GC cycle. It is used by GCs that trigger a "          \
2057           "concurrent GC cycle based on the occupancy of the entire heap, " \
2058           "not just one of the generations (e.g., G1). A value of 0 "       \
2059           "denotes 'do constant GC cycles'.")                               \
2060           range(0, 100)                                                     \
2061                                                                             \
2062   manageable(intx, CMSTriggerInterval, -1,                                  \
2063           "Commence a CMS collection cycle (at least) every so many "       \
2064           "milliseconds (0 permanently, -1 disabled)")                      \
2065           range(-1, max_intx)                                               \
2066                                                                             \
2067   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2068           "Only use occupancy as a criterion for starting a CMS collection")\
2069                                                                             \
2070   product(uintx, CMSIsTooFullPercentage, 98,                                \
2071           "An absolute ceiling above which CMS will always consider the "   \
2072           "unloading of classes when class unloading is enabled")           \
2073           range(0, 100)                                                     \
2074                                                                             \
2075   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2076           "Check that all the garbage collected was returned to the "       \
2077           "free lists")                                                     \
2078                                                                             \
2079   notproduct(bool, ScavengeALot, false,                                     \
2080           "Force scavenge at every Nth exit from the runtime system "       \
2081           "(N=ScavengeALotInterval)")                                       \
2082                                                                             \
2083   develop(bool, FullGCALot, false,                                          \
2084           "Force full gc at every Nth exit from the runtime system "        \
2085           "(N=FullGCALotInterval)")                                         \
2086                                                                             \
2087   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2088           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2089                                                                             \
2090   product(bool, PrintPromotionFailure, false,                               \
2091           "Print additional diagnostic information following "              \
2092           "promotion failure")                                              \
2093                                                                             \
2094   notproduct(bool, PromotionFailureALot, false,                             \
2095           "Use promotion failure handling on every youngest generation "    \
2096           "collection")                                                     \
2097                                                                             \
2098   develop(uintx, PromotionFailureALotCount, 1000,                           \
2099           "Number of promotion failures occurring at PLAB "                 \
2100           "refill attempts (ParNew) or promotion attempts "                 \
2101           "(other young collectors)")                                       \
2102                                                                             \
2103   develop(uintx, PromotionFailureALotInterval, 5,                           \
2104           "Total collections between promotion failures a lot")             \
2105                                                                             \
2106   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2107           "Sleep time when sleep is used for yields")                       \
2108                                                                             \
2109   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2110           "Number of yields before a sleep is done during work stealing")   \
2111                                                                             \
2112   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2113           "Number of iterations in a spin loop between checks on "          \
2114           "time out of hard spin")                                          \
2115                                                                             \
2116   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2117           "Ratio of hard spins to calls to yield")                          \
2118                                                                             \
2119   develop(uintx, ObjArrayMarkingStride, 512,                                \
2120           "Number of object array elements to push onto the marking stack " \
2121           "before pushing a continuation entry")                            \
2122                                                                             \
2123   develop(bool, MetadataAllocationFailALot, false,                          \
2124           "Fail metadata allocations at intervals controlled by "           \
2125           "MetadataAllocationFailALotInterval")                             \
2126                                                                             \
2127   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2128           "Metadata allocation failure a lot interval")                     \
2129                                                                             \
2130   develop(bool, TraceMetadataChunkAllocation, false,                        \
2131           "Trace chunk metadata allocations")                               \
2132                                                                             \
2133   product(bool, TraceMetadataHumongousAllocation, false,                    \
2134           "Trace humongous metadata allocations")                           \
2135                                                                             \
2136   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2137           "Trace virtual space metadata allocations")                       \
2138                                                                             \
2139   notproduct(bool, ExecuteInternalVMTests, false,                           \
2140           "Enable execution of internal VM tests")                          \
2141                                                                             \
2142   notproduct(bool, VerboseInternalVMTests, false,                           \
2143           "Turn on logging for internal VM tests.")                         \
2144                                                                             \
2145   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2146                                                                             \
2147   product_pd(bool, ResizeTLAB,                                              \
2148           "Dynamically resize TLAB size for threads")                       \
2149                                                                             \
2150   product(bool, ZeroTLAB, false,                                            \
2151           "Zero out the newly created TLAB")                                \
2152                                                                             \
2153   product(bool, FastTLABRefill, true,                                       \
2154           "Use fast TLAB refill code")                                      \
2155                                                                             \
2156   product(bool, PrintTLAB, false,                                           \
2157           "Print various TLAB related information")                         \
2158                                                                             \
2159   product(bool, TLABStats, true,                                            \
2160           "Provide more detailed and expensive TLAB statistics "            \
2161           "(with PrintTLAB)")                                               \
2162                                                                             \
2163   product_pd(bool, NeverActAsServerClassMachine,                            \
2164           "Never act like a server-class machine")                          \
2165                                                                             \
2166   product(bool, AlwaysActAsServerClassMachine, false,                       \
2167           "Always act like a server-class machine")                         \
2168                                                                             \
2169   product_pd(uint64_t, MaxRAM,                                              \
2170           "Real memory size (in bytes) used to set maximum heap size")      \
2171           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2172                                                                             \
2173   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2174           "Maximum ergonomically set heap size (in bytes); zero means use " \
2175           "MaxRAM / MaxRAMFraction")                                        \
2176                                                                             \
2177   product(uintx, MaxRAMFraction, 4,                                         \
2178           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2179           "size")                                                           \
2180           range(1, max_uintx)                                               \
2181                                                                             \
2182   product(uintx, MinRAMFraction, 2,                                         \
2183           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2184           "size on systems with small physical memory size")                \
2185           range(1, max_uintx)                                               \
2186                                                                             \
2187   product(uintx, InitialRAMFraction, 64,                                    \
2188           "Fraction (1/n) of real memory used for initial heap size")       \
2189           range(1, max_uintx)                                               \
2190                                                                             \
2191   develop(uintx, MaxVirtMemFraction, 2,                                     \
2192           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2193           "determining maximum heap size")                                  \
2194                                                                             \
2195   product(bool, UseAutoGCSelectPolicy, false,                               \
2196           "Use automatic collection selection policy")                      \
2197                                                                             \
2198   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2199           "Automatic GC selection pause threshold in milliseconds")         \
2200                                                                             \
2201   product(bool, UseAdaptiveSizePolicy, true,                                \
2202           "Use adaptive generation sizing policies")                        \
2203                                                                             \
2204   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2205           "Use adaptive survivor sizing policies")                          \
2206                                                                             \
2207   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2208           "Use adaptive young-old sizing policies at minor collections")    \
2209                                                                             \
2210   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2211           "Use adaptive young-old sizing policies at major collections")    \
2212                                                                             \
2213   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2214           "Include statistics from System.gc() for adaptive size policy")   \
2215                                                                             \
2216   product(bool, UseAdaptiveGCBoundary, false,                               \
2217           "Allow young-old boundary to move")                               \
2218                                                                             \
2219   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2220           "Trace young-old boundary moves")                                 \
2221                                                                             \
2222   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2223           "Resize the virtual spaces of the young or old generations")      \
2224           range(-1, 1)                                                      \
2225                                                                             \
2226   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2227           "Policy for changing generation size for throughput goals")       \
2228           range(0, 1)                                                       \
2229                                                                             \
2230   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2231           "Number of steps where heuristics is used before data is used")   \
2232                                                                             \
2233   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2234           "Number of collections before the adaptive sizing is started")    \
2235                                                                             \
2236   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2237           "Collection interval for printing information; zero means never") \
2238                                                                             \
2239   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2240           "Use adaptive minimum footprint as a goal")                       \
2241                                                                             \
2242   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2243           "Weight given to exponential resizing, between 0 and 100")        \
2244           range(0, 100)                                                     \
2245                                                                             \
2246   product(uintx, AdaptiveTimeWeight,       25,                              \
2247           "Weight given to time in adaptive policy, between 0 and 100")     \
2248           range(0, 100)                                                     \
2249                                                                             \
2250   product(uintx, PausePadding, 1,                                           \
2251           "How much buffer to keep for pause time")                         \
2252                                                                             \
2253   product(uintx, PromotedPadding, 3,                                        \
2254           "How much buffer to keep for promotion failure")                  \
2255                                                                             \
2256   product(uintx, SurvivorPadding, 3,                                        \
2257           "How much buffer to keep for survivor overflow")                  \
2258                                                                             \
2259   product(uintx, ThresholdTolerance, 10,                                    \
2260           "Allowed collection cost difference between generations")         \
2261           range(0, 100)                                                     \
2262                                                                             \
2263   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2264           "If collection costs are within margin, reduce both by full "     \
2265           "delta")                                                          \
2266                                                                             \
2267   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2268           "Adaptive size percentage change in young generation")            \
2269           range(0, 100)                                                     \
2270                                                                             \
2271   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2272           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2273           range(0, 100)                                                     \
2274                                                                             \
2275   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2276           "Decay factor to YoungedGenerationSizeSupplement")                \
2277           range(1, max_uintx)                                               \
2278                                                                             \
2279   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2280           "Adaptive size percentage change in tenured generation")          \
2281           range(0, 100)                                                     \
2282                                                                             \
2283   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2284           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2285           range(0, 100)                                                     \
2286                                                                             \
2287   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2288           "Decay factor to TenuredGenerationSizeIncrement")                 \
2289           range(1, max_uintx)                                               \
2290                                                                             \
2291   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2292           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2293           "or (G1 Only) the maximum GC time per MMU time slice")            \
2294           range(1, max_uintx)                                               \
2295           constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit)        \
2296                                                                             \
2297   product(uintx, GCPauseIntervalMillis, 0,                                  \
2298           "Time slice for MMU specification")                               \
2299           constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit)   \
2300                                                                             \
2301   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2302           "Adaptive size policy maximum GC minor pause time goal "          \
2303           "in millisecond")                                                 \
2304                                                                             \
2305   product(uintx, GCTimeRatio, 99,                                           \
2306           "Adaptive size policy application time to GC time ratio")         \
2307                                                                             \
2308   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2309           "Adaptive size scale down factor for shrinking")                  \
2310           range(1, max_uintx)                                               \
2311                                                                             \
2312   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2313           "Adaptive size decays the major cost for long major intervals")   \
2314                                                                             \
2315   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2316           "Time scale over which major costs decay")                        \
2317                                                                             \
2318   product(uintx, MinSurvivorRatio, 3,                                       \
2319           "Minimum ratio of young generation/survivor space size")          \
2320           range(3, max_uintx)                                               \
2321                                                                             \
2322   product(uintx, InitialSurvivorRatio, 8,                                   \
2323           "Initial ratio of young generation/survivor space size")          \
2324                                                                             \
2325   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2326           "Estimate of footprint other than Java Heap")                     \
2327                                                                             \
2328   product(bool, UseGCOverheadLimit, true,                                   \
2329           "Use policy to limit of proportion of time spent in GC "          \
2330           "before an OutOfMemory error is thrown")                          \
2331                                                                             \
2332   product(uintx, GCTimeLimit, 98,                                           \
2333           "Limit of the proportion of time spent in GC before "             \
2334           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2335           range(0, 100)                                                     \
2336                                                                             \
2337   product(uintx, GCHeapFreeLimit, 2,                                        \
2338           "Minimum percentage of free space after a full GC before an "     \
2339           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2340           range(0, 100)                                                     \
2341                                                                             \
2342   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2343           "Number of consecutive collections before gc time limit fires")   \
2344           range(1, max_uintx)                                               \
2345                                                                             \
2346   product(bool, PrintAdaptiveSizePolicy, false,                             \
2347           "Print information about AdaptiveSizePolicy")                     \
2348                                                                             \
2349   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2350           "How far ahead to prefetch destination area (<= 0 means off)")    \
2351                                                                             \
2352   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2353           "How far ahead to prefetch scan area (<= 0 means off)")           \
2354                                                                             \
2355   product(intx, PrefetchFieldsAhead, -1,                                    \
2356           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2357                                                                             \
2358   diagnostic(bool, VerifySilently, false,                                   \
2359           "Do not print the verification progress")                         \
2360                                                                             \
2361   diagnostic(bool, VerifyDuringStartup, false,                              \
2362           "Verify memory system before executing any Java code "            \
2363           "during VM initialization")                                       \
2364                                                                             \
2365   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2366           "Verify system before exiting")                                   \
2367                                                                             \
2368   diagnostic(bool, VerifyBeforeGC, false,                                   \
2369           "Verify memory system before GC")                                 \
2370                                                                             \
2371   diagnostic(bool, VerifyAfterGC, false,                                    \
2372           "Verify memory system after GC")                                  \
2373                                                                             \
2374   diagnostic(bool, VerifyDuringGC, false,                                   \
2375           "Verify memory system during GC (between phases)")                \
2376                                                                             \
2377   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2378           "Enable parallel memory system verification")                     \
2379                                                                             \
2380   diagnostic(bool, DeferInitialCardMark, false,                             \
2381           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2382           "may arise from new_pre_store_barrier")                           \
2383                                                                             \
2384   product(bool, UseCondCardMark, false,                                     \
2385           "Check for already marked card before updating card table")       \
2386                                                                             \
2387   diagnostic(bool, VerifyRememberedSets, false,                             \
2388           "Verify GC remembered sets")                                      \
2389                                                                             \
2390   diagnostic(bool, VerifyObjectStartArray, true,                            \
2391           "Verify GC object start array if verify before/after")            \
2392                                                                             \
2393   product(bool, DisableExplicitGC, false,                                   \
2394           "Ignore calls to System.gc()")                                    \
2395                                                                             \
2396   notproduct(bool, CheckMemoryInitialization, false,                        \
2397           "Check memory initialization")                                    \
2398                                                                             \
2399   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2400           "Bind CMS Thread to CPU if possible")                             \
2401                                                                             \
2402   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2403           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2404                                                                             \
2405   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2406           "Bind GCTaskThreads to CPUs if possible")                         \
2407                                                                             \
2408   product(bool, UseGCTaskAffinity, false,                                   \
2409           "Use worker affinity when asking for GCTasks")                    \
2410                                                                             \
2411   product(uintx, ProcessDistributionStride, 4,                              \
2412           "Stride through processors when distributing processes")          \
2413                                                                             \
2414   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2415           "Number of times the coordinator GC thread will sleep while "     \
2416           "yielding before giving up and resuming GC")                      \
2417                                                                             \
2418   product(uintx, CMSYieldSleepCount, 0,                                     \
2419           "Number of times a GC thread (minus the coordinator) "            \
2420           "will sleep while yielding before giving up and resuming GC")     \
2421                                                                             \
2422   /* gc tracing */                                                          \
2423   manageable(bool, PrintGC, false,                                          \
2424           "Print message at garbage collection")                            \
2425                                                                             \
2426   manageable(bool, PrintGCDetails, false,                                   \
2427           "Print more details at garbage collection")                       \
2428                                                                             \
2429   manageable(bool, PrintGCDateStamps, false,                                \
2430           "Print date stamps at garbage collection")                        \
2431                                                                             \
2432   manageable(bool, PrintGCTimeStamps, false,                                \
2433           "Print timestamps at garbage collection")                         \
2434                                                                             \
2435   manageable(bool, PrintGCID, true,                                         \
2436           "Print an identifier for each garbage collection")                \
2437                                                                             \
2438   product(bool, PrintGCTaskTimeStamps, false,                               \
2439           "Print timestamps for individual gc worker thread tasks")         \
2440                                                                             \
2441   develop(intx, ConcGCYieldTimeout, 0,                                      \
2442           "If non-zero, assert that GC threads yield within this "          \
2443           "number of milliseconds")                                         \
2444           range(0, max_intx)                                                \
2445                                                                             \
2446   product(bool, PrintReferenceGC, false,                                    \
2447           "Print times spent handling reference objects during GC "         \
2448           "(enabled only when PrintGCDetails)")                             \
2449                                                                             \
2450   develop(bool, TraceReferenceGC, false,                                    \
2451           "Trace handling of soft/weak/final/phantom references")           \
2452                                                                             \
2453   develop(bool, TraceFinalizerRegistration, false,                          \
2454           "Trace registration of final references")                         \
2455                                                                             \
2456   notproduct(bool, TraceScavenge, false,                                    \
2457           "Trace scavenge")                                                 \
2458                                                                             \
2459   product(bool, IgnoreEmptyClassPaths, false,                               \
2460           "Ignore empty path elements in -classpath")                       \
2461                                                                             \
2462   product(bool, TraceClassPaths, false,                                     \
2463           "Trace processing of class paths")                                \
2464                                                                             \
2465   product_rw(bool, TraceClassLoading, false,                                \
2466           "Trace all classes loaded")                                       \
2467                                                                             \
2468   product(bool, TraceClassLoadingPreorder, false,                           \
2469           "Trace all classes loaded in order referenced (not loaded)")      \
2470                                                                             \
2471   product_rw(bool, TraceClassUnloading, false,                              \
2472           "Trace unloading of classes")                                     \
2473                                                                             \
2474   product_rw(bool, TraceLoaderConstraints, false,                           \
2475           "Trace loader constraints")                                       \
2476                                                                             \
2477   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2478           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2479           "Initial size of the boot class loader data metaspace")           \
2480           range(30*K, max_uintx/BytesPerWord)                               \
2481           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2482                                                                             \
2483   product(bool, TraceYoungGenTime, false,                                   \
2484           "Trace accumulated time for young collection")                    \
2485                                                                             \
2486   product(bool, TraceOldGenTime, false,                                     \
2487           "Trace accumulated time for old collection")                      \
2488                                                                             \
2489   product(bool, PrintTenuringDistribution, false,                           \
2490           "Print tenuring age information")                                 \
2491                                                                             \
2492   product_rw(bool, PrintHeapAtGC, false,                                    \
2493           "Print heap layout before and after each GC")                     \
2494                                                                             \
2495   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2496           "Print extended information about the layout of the heap "        \
2497           "when -XX:+PrintHeapAtGC is set")                                 \
2498                                                                             \
2499   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2500           "Print heap layout in response to SIGBREAK")                      \
2501                                                                             \
2502   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2503           "Print a class histogram before any major stop-world GC")         \
2504                                                                             \
2505   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2506           "Print a class histogram after any major stop-world GC")          \
2507                                                                             \
2508   manageable(bool, PrintClassHistogram, false,                              \
2509           "Print a histogram of class instances")                           \
2510                                                                             \
2511   develop(bool, TraceWorkGang, false,                                       \
2512           "Trace activities of work gangs")                                 \
2513                                                                             \
2514   product(bool, TraceParallelOldGCTasks, false,                             \
2515           "Trace multithreaded GC activity")                                \
2516                                                                             \
2517   develop(bool, TraceBlockOffsetTable, false,                               \
2518           "Print BlockOffsetTable maps")                                    \
2519                                                                             \
2520   develop(bool, TraceCardTableModRefBS, false,                              \
2521           "Print CardTableModRefBS maps")                                   \
2522                                                                             \
2523   develop(bool, TraceGCTaskManager, false,                                  \
2524           "Trace actions of the GC task manager")                           \
2525                                                                             \
2526   develop(bool, TraceGCTaskQueue, false,                                    \
2527           "Trace actions of the GC task queues")                            \
2528                                                                             \
2529   diagnostic(bool, TraceGCTaskThread, false,                                \
2530           "Trace actions of the GC task threads")                           \
2531                                                                             \
2532   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2533           "Print the time taken by each phase in ParallelOldGC "            \
2534           "(PrintGCDetails must also be enabled)")                          \
2535                                                                             \
2536   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2537           "Trace marking phase in ParallelOldGC")                           \
2538                                                                             \
2539   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2540           "Trace summary phase in ParallelOldGC")                           \
2541                                                                             \
2542   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2543           "Trace compaction phase in ParallelOldGC")                        \
2544                                                                             \
2545   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2546           "Trace dense prefix computation for ParallelOldGC")               \
2547                                                                             \
2548   develop(bool, IgnoreLibthreadGPFault, false,                              \
2549           "Suppress workaround for libthread GP fault")                     \
2550                                                                             \
2551   product(bool, PrintJNIGCStalls, false,                                    \
2552           "Print diagnostic message when GC is stalled "                    \
2553           "by JNI critical section")                                        \
2554                                                                             \
2555   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2556           "The percentage of the used heap that the instances of a class "  \
2557           "must occupy for the class to generate a trace event")            \
2558           range(0.0, 100.0)                                                 \
2559                                                                             \
2560   /* GC log rotation setting */                                             \
2561                                                                             \
2562   product(bool, UseGCLogFileRotation, false,                                \
2563           "Rotate gclog files (for long running applications). It requires "\
2564           "-Xloggc:<filename>")                                             \
2565                                                                             \
2566   product(uintx, NumberOfGCLogFiles, 0,                                     \
2567           "Number of gclog files in rotation "                              \
2568           "(default: 0, no rotation)")                                      \
2569                                                                             \
2570   product(size_t, GCLogFileSize, 8*K,                                       \
2571           "GC log file size, requires UseGCLogFileRotation. "               \
2572           "Set to 0 to only trigger rotation via jcmd")                     \
2573                                                                             \
2574   /* JVMTI heap profiling */                                                \
2575                                                                             \
2576   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2577           "Trace JVMTI object tagging calls")                               \
2578                                                                             \
2579   diagnostic(bool, VerifyBeforeIteration, false,                            \
2580           "Verify memory system before JVMTI iteration")                    \
2581                                                                             \
2582   /* compiler interface */                                                  \
2583                                                                             \
2584   develop(bool, CIPrintCompilerName, false,                                 \
2585           "when CIPrint is active, print the name of the active compiler")  \
2586                                                                             \
2587   diagnostic(bool, CIPrintCompileQueue, false,                              \
2588           "display the contents of the compile queue whenever a "           \
2589           "compilation is enqueued")                                        \
2590                                                                             \
2591   develop(bool, CIPrintRequests, false,                                     \
2592           "display every request for compilation")                          \
2593                                                                             \
2594   product(bool, CITime, false,                                              \
2595           "collect timing information for compilation")                     \
2596                                                                             \
2597   develop(bool, CITimeVerbose, false,                                       \
2598           "be more verbose in compilation timings")                         \
2599                                                                             \
2600   develop(bool, CITimeEach, false,                                          \
2601           "display timing information after each successful compilation")   \
2602                                                                             \
2603   develop(bool, CICountOSR, false,                                          \
2604           "use a separate counter when assigning ids to osr compilations")  \
2605                                                                             \
2606   develop(bool, CICompileNatives, true,                                     \
2607           "compile native methods if supported by the compiler")            \
2608                                                                             \
2609   develop_pd(bool, CICompileOSR,                                            \
2610           "compile on stack replacement methods if supported by the "       \
2611           "compiler")                                                       \
2612                                                                             \
2613   develop(bool, CIPrintMethodCodes, false,                                  \
2614           "print method bytecodes of the compiled code")                    \
2615                                                                             \
2616   develop(bool, CIPrintTypeFlow, false,                                     \
2617           "print the results of ciTypeFlow analysis")                       \
2618                                                                             \
2619   develop(bool, CITraceTypeFlow, false,                                     \
2620           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2621                                                                             \
2622   develop(intx, OSROnlyBCI, -1,                                             \
2623           "OSR only at this bci.  Negative values mean exclude that bci")   \
2624                                                                             \
2625   /* compiler */                                                            \
2626                                                                             \
2627   /* notice: the max range value here is max_jint, not max_intx  */         \
2628   /* because of overflow issue                                   */         \
2629   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2630           "Number of compiler threads to run")                              \
2631           range(0, max_jint)                                                \
2632           constraint(CICompilerCountConstraintFunc, AtParse)                \
2633                                                                             \
2634   product(intx, CompilationPolicyChoice, 0,                                 \
2635           "which compilation policy (0-3)")                                 \
2636           range(0, 3)                                                       \
2637                                                                             \
2638   develop(bool, UseStackBanging, true,                                      \
2639           "use stack banging for stack overflow checks (required for "      \
2640           "proper StackOverflow handling; disable only to measure cost "    \
2641           "of stackbanging)")                                               \
2642                                                                             \
2643   develop(bool, UseStrictFP, true,                                          \
2644           "use strict fp if modifier strictfp is set")                      \
2645                                                                             \
2646   develop(bool, GenerateSynchronizationCode, true,                          \
2647           "generate locking/unlocking code for synchronized methods and "   \
2648           "monitors")                                                       \
2649                                                                             \
2650   develop(bool, GenerateCompilerNullChecks, true,                           \
2651           "Generate explicit null checks for loads/stores/calls")           \
2652                                                                             \
2653   develop(bool, GenerateRangeChecks, true,                                  \
2654           "Generate range checks for array accesses")                       \
2655                                                                             \
2656   develop_pd(bool, ImplicitNullChecks,                                      \
2657           "Generate code for implicit null checks")                         \
2658                                                                             \
2659   product_pd(bool, TrapBasedNullChecks,                                     \
2660           "Generate code for null checks that uses a cmp and trap "         \
2661           "instruction raising SIGTRAP.  This is only used if an access to" \
2662           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2663           "ImplicitNullChecks don't work (PPC64).")                         \
2664                                                                             \
2665   product(bool, PrintSafepointStatistics, false,                            \
2666           "Print statistics about safepoint synchronization")               \
2667                                                                             \
2668   product(intx, PrintSafepointStatisticsCount, 300,                         \
2669           "Total number of safepoint statistics collected "                 \
2670           "before printing them out")                                       \
2671           range(1, max_intx)                                                \
2672                                                                             \
2673   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2674           "Print safepoint statistics only when safepoint takes "           \
2675           "more than PrintSafepointSatisticsTimeout in millis")             \
2676   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2677   NOT_LP64(range(-1, max_intx))                                             \
2678                                                                             \
2679   product(bool, TraceSafepointCleanupTime, false,                           \
2680           "Print the break down of clean up tasks performed during "        \
2681           "safepoint")                                                      \
2682                                                                             \
2683   product(bool, Inline, true,                                               \
2684           "Enable inlining")                                                \
2685                                                                             \
2686   product(bool, ClipInlining, true,                                         \
2687           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2688                                                                             \
2689   develop(bool, UseCHA, true,                                               \
2690           "Enable CHA")                                                     \
2691                                                                             \
2692   product(bool, UseTypeProfile, true,                                       \
2693           "Check interpreter profile for historically monomorphic calls")   \
2694                                                                             \
2695   diagnostic(bool, PrintInlining, false,                                    \
2696           "Print inlining optimizations")                                   \
2697                                                                             \
2698   product(bool, UsePopCountInstruction, false,                              \
2699           "Use population count instruction")                               \
2700                                                                             \
2701   develop(bool, EagerInitialization, false,                                 \
2702           "Eagerly initialize classes if possible")                         \
2703                                                                             \
2704   diagnostic(bool, LogTouchedMethods, false,                                \
2705           "Log methods which have been ever touched in runtime")            \
2706                                                                             \
2707   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2708           "Print all methods that have been ever touched in runtime")       \
2709                                                                             \
2710   develop(bool, TraceMethodReplacement, false,                              \
2711           "Print when methods are replaced do to recompilation")            \
2712                                                                             \
2713   develop(bool, PrintMethodFlushing, false,                                 \
2714           "Print the nmethods being flushed")                               \
2715                                                                             \
2716   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2717           "print statistics about method flushing")                         \
2718                                                                             \
2719   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2720           "Number of compiled code invocations after which "                \
2721           "the method is considered as hot by the flusher")                 \
2722           range(1, max_jint)                                                \
2723                                                                             \
2724   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2725           "Minimum number of sweeper passes before an nmethod "             \
2726           "can be flushed")                                                 \
2727           range(0, max_intx)                                                \
2728                                                                             \
2729   product(bool, UseCodeAging, true,                                         \
2730           "Insert counter to detect warm methods")                          \
2731                                                                             \
2732   diagnostic(bool, StressCodeAging, false,                                  \
2733           "Start with counters compiled in")                                \
2734                                                                             \
2735   develop(bool, UseRelocIndex, false,                                       \
2736           "Use an index to speed random access to relocations")             \
2737                                                                             \
2738   develop(bool, StressCodeBuffers, false,                                   \
2739           "Exercise code buffer expansion and other rare state changes")    \
2740                                                                             \
2741   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2742           "Generate extra debugging information for non-safepoints in "     \
2743           "nmethods")                                                       \
2744                                                                             \
2745   product(bool, PrintVMOptions, false,                                      \
2746           "Print flags that appeared on the command line")                  \
2747                                                                             \
2748   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2749           "Ignore unrecognized VM options")                                 \
2750                                                                             \
2751   product(bool, PrintCommandLineFlags, false,                               \
2752           "Print flags specified on command line or set by ergonomics")     \
2753                                                                             \
2754   product(bool, PrintFlagsInitial, false,                                   \
2755           "Print all VM flags before argument processing and exit VM")      \
2756                                                                             \
2757   product(bool, PrintFlagsFinal, false,                                     \
2758           "Print all VM flags after argument and ergonomic processing")     \
2759                                                                             \
2760   notproduct(bool, PrintFlagsWithComments, false,                           \
2761           "Print all VM flags with default values and descriptions and "    \
2762           "exit")                                                           \
2763                                                                             \
2764   product(bool, PrintFlagsRanges, false,                                    \
2765           "Print VM flags and their ranges and exit VM")                    \
2766                                                                             \
2767   diagnostic(bool, SerializeVMOutput, true,                                 \
2768           "Use a mutex to serialize output to tty and LogFile")             \
2769                                                                             \
2770   diagnostic(bool, DisplayVMOutput, true,                                   \
2771           "Display all VM output on the tty, independently of LogVMOutput") \
2772                                                                             \
2773   diagnostic(bool, LogVMOutput, false,                                      \
2774           "Save VM output to LogFile")                                      \
2775                                                                             \
2776   diagnostic(ccstr, LogFile, NULL,                                          \
2777           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2778           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2779                                                                             \
2780   product(ccstr, ErrorFile, NULL,                                           \
2781           "If an error occurs, save the error data to this file "           \
2782           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2783                                                                             \
2784   product(bool, DisplayVMOutputToStderr, false,                             \
2785           "If DisplayVMOutput is true, display all VM output to stderr")    \
2786                                                                             \
2787   product(bool, DisplayVMOutputToStdout, false,                             \
2788           "If DisplayVMOutput is true, display all VM output to stdout")    \
2789                                                                             \
2790   product(bool, UseHeavyMonitors, false,                                    \
2791           "use heavyweight instead of lightweight Java monitors")           \
2792                                                                             \
2793   product(bool, PrintStringTableStatistics, false,                          \
2794           "print statistics about the StringTable and SymbolTable")         \
2795                                                                             \
2796   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2797           "verify StringTable contents at exit")                            \
2798                                                                             \
2799   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2800           "print histogram of the symbol table")                            \
2801                                                                             \
2802   notproduct(bool, ExitVMOnVerifyError, false,                              \
2803           "standard exit from VM if bytecode verify error "                 \
2804           "(only in debug mode)")                                           \
2805                                                                             \
2806   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2807           "Call fatal if this exception is thrown.  Example: "              \
2808           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2809                                                                             \
2810   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2811           "Call fatal if the exception pointed by AbortVMOnException "      \
2812           "has this message")                                               \
2813                                                                             \
2814   develop(bool, DebugVtables, false,                                        \
2815           "add debugging code to vtable dispatch")                          \
2816                                                                             \
2817   develop(bool, PrintVtables, false,                                        \
2818           "print vtables when printing klass")                              \
2819                                                                             \
2820   notproduct(bool, PrintVtableStats, false,                                 \
2821           "print vtables stats at end of run")                              \
2822                                                                             \
2823   develop(bool, TraceCreateZombies, false,                                  \
2824           "trace creation of zombie nmethods")                              \
2825                                                                             \
2826   notproduct(bool, IgnoreLockingAssertions, false,                          \
2827           "disable locking assertions (for speed)")                         \
2828                                                                             \
2829   product(bool, RangeCheckElimination, true,                                \
2830           "Eliminate range checks")                                         \
2831                                                                             \
2832   develop_pd(bool, UncommonNullCast,                                        \
2833           "track occurrences of null in casts; adjust compiler tactics")    \
2834                                                                             \
2835   develop(bool, TypeProfileCasts,  true,                                    \
2836           "treat casts like calls for purposes of type profiling")          \
2837                                                                             \
2838   develop(bool, DelayCompilationDuringStartup, true,                        \
2839           "Delay invoking the compiler until main application class is "    \
2840           "loaded")                                                         \
2841                                                                             \
2842   develop(bool, CompileTheWorld, false,                                     \
2843           "Compile all methods in all classes in bootstrap class path "     \
2844             "(stress test)")                                                \
2845                                                                             \
2846   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2847           "Preload all classes used by a class before start loading")       \
2848                                                                             \
2849   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2850           "Force a safepoint every n compiles so sweeper can keep up")      \
2851                                                                             \
2852   develop(bool, FillDelaySlots, true,                                       \
2853           "Fill delay slots (on SPARC only)")                               \
2854                                                                             \
2855   develop(bool, TimeLivenessAnalysis, false,                                \
2856           "Time computation of bytecode liveness analysis")                 \
2857                                                                             \
2858   develop(bool, TraceLivenessGen, false,                                    \
2859           "Trace the generation of liveness analysis information")          \
2860                                                                             \
2861   notproduct(bool, TraceLivenessQuery, false,                               \
2862           "Trace queries of liveness analysis information")                 \
2863                                                                             \
2864   notproduct(bool, CollectIndexSetStatistics, false,                        \
2865           "Collect information about IndexSets")                            \
2866                                                                             \
2867   develop(bool, UseLoopSafepoints, true,                                    \
2868           "Generate Safepoint nodes in every loop")                         \
2869                                                                             \
2870   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2871           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2872           "Inline allocations larger than this in doublewords must go slow")\
2873                                                                             \
2874   product(bool, AggressiveOpts, false,                                      \
2875           "Enable aggressive optimizations - see arguments.cpp")            \
2876                                                                             \
2877   product_pd(uintx, TypeProfileLevel,                                       \
2878           "=XYZ, with Z: Type profiling of arguments at call; "             \
2879                      "Y: Type profiling of return value at call; "          \
2880                      "X: Type profiling of parameters to methods; "         \
2881           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2882           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2883                                                                             \
2884   product(intx, TypeProfileArgsLimit,     2,                                \
2885           "max number of call arguments to consider for type profiling")    \
2886           range(0, 16)                                                      \
2887                                                                             \
2888   product(intx, TypeProfileParmsLimit,    2,                                \
2889           "max number of incoming parameters to consider for type profiling"\
2890           ", -1 for all")                                                   \
2891           range(-1, 64)                                                     \
2892                                                                             \
2893   /* statistics */                                                          \
2894   develop(bool, CountCompiledCalls, false,                                  \
2895           "Count method invocations")                                       \
2896                                                                             \
2897   notproduct(bool, CountRuntimeCalls, false,                                \
2898           "Count VM runtime calls")                                         \
2899                                                                             \
2900   develop(bool, CountJNICalls, false,                                       \
2901           "Count jni method invocations")                                   \
2902                                                                             \
2903   notproduct(bool, CountJVMCalls, false,                                    \
2904           "Count jvm method invocations")                                   \
2905                                                                             \
2906   notproduct(bool, CountRemovableExceptions, false,                         \
2907           "Count exceptions that could be replaced by branches due to "     \
2908           "inlining")                                                       \
2909                                                                             \
2910   notproduct(bool, ICMissHistogram, false,                                  \
2911           "Produce histogram of IC misses")                                 \
2912                                                                             \
2913   /* interpreter */                                                         \
2914   develop(bool, ClearInterpreterLocals, false,                              \
2915           "Always clear local variables of interpreter activations upon "   \
2916           "entry")                                                          \
2917                                                                             \
2918   product_pd(bool, RewriteBytecodes,                                        \
2919           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2920                                                                             \
2921   product_pd(bool, RewriteFrequentPairs,                                    \
2922           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2923                                                                             \
2924   diagnostic(bool, PrintInterpreter, false,                                 \
2925           "Print the generated interpreter code")                           \
2926                                                                             \
2927   product(bool, UseInterpreter, true,                                       \
2928           "Use interpreter for non-compiled methods")                       \
2929                                                                             \
2930   develop(bool, UseFastSignatureHandlers, true,                             \
2931           "Use fast signature handlers for native calls")                   \
2932                                                                             \
2933   product(bool, UseLoopCounter, true,                                       \
2934           "Increment invocation counter on backward branch")                \
2935                                                                             \
2936   product_pd(bool, UseOnStackReplacement,                                   \
2937           "Use on stack replacement, calls runtime if invoc. counter "      \
2938           "overflows in loop")                                              \
2939                                                                             \
2940   notproduct(bool, TraceOnStackReplacement, false,                          \
2941           "Trace on stack replacement")                                     \
2942                                                                             \
2943   product_pd(bool, PreferInterpreterNativeStubs,                            \
2944           "Use always interpreter stubs for native methods invoked via "    \
2945           "interpreter")                                                    \
2946                                                                             \
2947   develop(bool, CountBytecodes, false,                                      \
2948           "Count number of bytecodes executed")                             \
2949                                                                             \
2950   develop(bool, PrintBytecodeHistogram, false,                              \
2951           "Print histogram of the executed bytecodes")                      \
2952                                                                             \
2953   develop(bool, PrintBytecodePairHistogram, false,                          \
2954           "Print histogram of the executed bytecode pairs")                 \
2955                                                                             \
2956   diagnostic(bool, PrintSignatureHandlers, false,                           \
2957           "Print code generated for native method signature handlers")      \
2958                                                                             \
2959   develop(bool, VerifyOops, false,                                          \
2960           "Do plausibility checks for oops")                                \
2961                                                                             \
2962   develop(bool, CheckUnhandledOops, false,                                  \
2963           "Check for unhandled oops in VM code")                            \
2964                                                                             \
2965   develop(bool, VerifyJNIFields, trueInDebug,                               \
2966           "Verify jfieldIDs for instance fields")                           \
2967                                                                             \
2968   notproduct(bool, VerifyJNIEnvThread, false,                               \
2969           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2970           "from JNI")                                                       \
2971                                                                             \
2972   develop(bool, VerifyFPU, false,                                           \
2973           "Verify FPU state (check for NaN's, etc.)")                       \
2974                                                                             \
2975   develop(bool, VerifyThread, false,                                        \
2976           "Watch the thread register for corruption (SPARC only)")          \
2977                                                                             \
2978   develop(bool, VerifyActivationFrameSize, false,                           \
2979           "Verify that activation frame didn't become smaller than its "    \
2980           "minimal size")                                                   \
2981                                                                             \
2982   develop(bool, TraceFrequencyInlining, false,                              \
2983           "Trace frequency based inlining")                                 \
2984                                                                             \
2985   develop_pd(bool, InlineIntrinsics,                                        \
2986           "Inline intrinsics that can be statically resolved")              \
2987                                                                             \
2988   product_pd(bool, ProfileInterpreter,                                      \
2989           "Profile at the bytecode level during interpretation")            \
2990                                                                             \
2991   develop(bool, TraceProfileInterpreter, false,                             \
2992           "Trace profiling at the bytecode level during interpretation. "   \
2993           "This outputs the profiling information collected to improve "    \
2994           "jit compilation.")                                               \
2995                                                                             \
2996   develop_pd(bool, ProfileTraps,                                            \
2997           "Profile deoptimization traps at the bytecode level")             \
2998                                                                             \
2999   product(intx, ProfileMaturityPercentage, 20,                              \
3000           "number of method invocations/branches (expressed as % of "       \
3001           "CompileThreshold) before using the method's profile")            \
3002           range(0, 100)                                                     \
3003                                                                             \
3004   diagnostic(bool, PrintMethodData, false,                                  \
3005           "Print the results of +ProfileInterpreter at end of run")         \
3006                                                                             \
3007   develop(bool, VerifyDataPointer, trueInDebug,                             \
3008           "Verify the method data pointer during interpreter profiling")    \
3009                                                                             \
3010   develop(bool, VerifyCompiledCode, false,                                  \
3011           "Include miscellaneous runtime verifications in nmethod code; "   \
3012           "default off because it disturbs nmethod size heuristics")        \
3013                                                                             \
3014   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
3015           "Manually make GC thread crash then dump java stack trace;  "     \
3016           "Test only")                                                      \
3017                                                                             \
3018   /* compilation */                                                         \
3019   product(bool, UseCompiler, true,                                          \
3020           "Use Just-In-Time compilation")                                   \
3021                                                                             \
3022   develop(bool, TraceCompilationPolicy, false,                              \
3023           "Trace compilation policy")                                       \
3024                                                                             \
3025   develop(bool, TimeCompilationPolicy, false,                               \
3026           "Time the compilation policy")                                    \
3027                                                                             \
3028   product(bool, UseCounterDecay, true,                                      \
3029           "Adjust recompilation counters")                                  \
3030                                                                             \
3031   develop(intx, CounterHalfLifeTime,    30,                                 \
3032           "Half-life time of invocation counters (in seconds)")             \
3033                                                                             \
3034   develop(intx, CounterDecayMinIntervalLength,   500,                       \
3035           "The minimum interval (in milliseconds) between invocation of "   \
3036           "CounterDecay")                                                   \
3037                                                                             \
3038   product(bool, AlwaysCompileLoopMethods, false,                            \
3039           "When using recompilation, never interpret methods "              \
3040           "containing loops")                                               \
3041                                                                             \
3042   product(bool, DontCompileHugeMethods, true,                               \
3043           "Do not compile methods > HugeMethodLimit")                       \
3044                                                                             \
3045   /* Bytecode escape analysis estimation. */                                \
3046   product(bool, EstimateArgEscape, true,                                    \
3047           "Analyze bytecodes to estimate escape state of arguments")        \
3048                                                                             \
3049   product(intx, BCEATraceLevel, 0,                                          \
3050           "How much tracing to do of bytecode escape analysis estimates "   \
3051           "(0-3)")                                                          \
3052           range(0, 3)                                                       \
3053                                                                             \
3054   product(intx, MaxBCEAEstimateLevel, 5,                                    \
3055           "Maximum number of nested calls that are analyzed by BC EA")      \
3056           range(0, max_jint)                                                \
3057                                                                             \
3058   product(intx, MaxBCEAEstimateSize, 150,                                   \
3059           "Maximum bytecode size of a method to be analyzed by BC EA")      \
3060           range(0, max_jint)                                                \
3061                                                                             \
3062   product(intx,  AllocatePrefetchStyle, 1,                                  \
3063           "0 = no prefetch, "                                               \
3064           "1 = prefetch instructions for each allocation, "                 \
3065           "2 = use TLAB watermark to gate allocation prefetch, "            \
3066           "3 = use BIS instruction on Sparc for allocation prefetch")       \
3067           range(0, 3)                                                       \
3068                                                                             \
3069   product(intx,  AllocatePrefetchDistance, -1,                              \
3070           "Distance to prefetch ahead of allocation pointer. "              \
3071           "-1: use system-specific value (automatically determined")        \
3072           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
3073                                                                             \
3074   product(intx,  AllocatePrefetchLines, 3,                                  \
3075           "Number of lines to prefetch ahead of array allocation pointer")  \
3076           range(1, max_jint / 2)                                            \
3077                                                                             \
3078   product(intx,  AllocateInstancePrefetchLines, 1,                          \
3079           "Number of lines to prefetch ahead of instance allocation "       \
3080           "pointer")                                                        \
3081           range(1, max_jint / 2)                                            \
3082                                                                             \
3083   product(intx,  AllocatePrefetchStepSize, 16,                              \
3084           "Step size in bytes of sequential prefetch instructions")         \
3085           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
3086                                                                             \
3087   product(intx,  AllocatePrefetchInstr, 0,                                  \
3088           "Prefetch instruction to prefetch ahead of allocation pointer")   \
3089           constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo)        \
3090                                                                             \
3091   /* deoptimization */                                                      \
3092   develop(bool, TraceDeoptimization, false,                                 \
3093           "Trace deoptimization")                                           \
3094                                                                             \
3095   develop(bool, PrintDeoptimizationDetails, false,                          \
3096           "Print more information about deoptimization")                    \
3097                                                                             \
3098   develop(bool, DebugDeoptimization, false,                                 \
3099           "Tracing various information while debugging deoptimization")     \
3100                                                                             \
3101   product(intx, SelfDestructTimer, 0,                                       \
3102           "Will cause VM to terminate after a given time (in minutes) "     \
3103           "(0 means off)")                                                  \
3104           range(0, max_intx)                                                \
3105                                                                             \
3106   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3107           "The maximum number of lines in the stack trace for Java "        \
3108           "exceptions (0 means all)")                                       \
3109           range(0, max_jint/2)                                              \
3110                                                                             \
3111   /* notice: the max range value here is max_jint, not max_intx  */         \
3112   /* because of overflow issue                                   */         \
3113   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3114           "Guarantee a safepoint (at least) every so many milliseconds "    \
3115           "(0 means none)"))                                                \
3116   NOT_EMBEDDED(range(0, max_jint))                                          \
3117                                                                             \
3118   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3119           "Guarantee a safepoint (at least) every so many milliseconds "    \
3120           "(0 means none)"))                                                \
3121   EMBEDDED_ONLY(range(0, max_jint))                                         \
3122                                                                             \
3123   product(intx, SafepointTimeoutDelay, 10000,                               \
3124           "Delay in milliseconds for option SafepointTimeout")              \
3125   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
3126   NOT_LP64(range(0, max_intx))                                              \
3127                                                                             \
3128   product(intx, NmethodSweepActivity, 10,                                   \
3129           "Removes cold nmethods from code cache if > 0. Higher values "    \
3130           "result in more aggressive sweeping")                             \
3131           range(0, 2000)                                                    \
3132                                                                             \
3133   notproduct(bool, LogSweeper, false,                                       \
3134           "Keep a ring buffer of sweeper activity")                         \
3135                                                                             \
3136   notproduct(intx, SweeperLogEntries, 1024,                                 \
3137           "Number of records in the ring buffer of sweeper activity")       \
3138                                                                             \
3139   notproduct(intx, MemProfilingInterval, 500,                               \
3140           "Time between each invocation of the MemProfiler")                \
3141                                                                             \
3142   develop(intx, MallocCatchPtr, -1,                                         \
3143           "Hit breakpoint when mallocing/freeing this pointer")             \
3144                                                                             \
3145   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3146           "List of assertions (file:line) to muzzle")                       \
3147                                                                             \
3148   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3149           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3150           "is used")                                                        \
3151                                                                             \
3152   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3153           "Threshold for total handle allocation when "                     \
3154           "+TraceHandleAllocation is used")                                 \
3155                                                                             \
3156   develop(intx, StackPrintLimit, 100,                                       \
3157           "number of stack frames to print in VM-level stack dump")         \
3158                                                                             \
3159   notproduct(intx, MaxElementPrintSize, 256,                                \
3160           "maximum number of elements to print")                            \
3161                                                                             \
3162   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3163           "maximum number of subklasses to print when printing klass")      \
3164                                                                             \
3165   product(intx, MaxInlineLevel, 9,                                          \
3166           "maximum number of nested calls that are inlined")                \
3167           range(0, max_jint)                                                \
3168                                                                             \
3169   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3170           "maximum number of nested recursive calls that are inlined")      \
3171           range(0, max_jint)                                                \
3172                                                                             \
3173   develop(intx, MaxForceInlineLevel, 100,                                   \
3174           "maximum number of nested calls that are forced for inlining "    \
3175           "(using CompileCommand or marked w/ @ForceInline)")               \
3176           range(0, max_jint)                                                \
3177                                                                             \
3178   product_pd(intx, InlineSmallCode,                                         \
3179           "Only inline already compiled methods if their code size is "     \
3180           "less than this")                                                 \
3181           range(0, max_jint)                                                \
3182                                                                             \
3183   product(intx, MaxInlineSize, 35,                                          \
3184           "The maximum bytecode size of a method to be inlined")            \
3185           range(0, max_jint)                                                \
3186                                                                             \
3187   product_pd(intx, FreqInlineSize,                                          \
3188           "The maximum bytecode size of a frequent method to be inlined")   \
3189           range(0, max_jint)                                                \
3190                                                                             \
3191   product(intx, MaxTrivialSize, 6,                                          \
3192           "The maximum bytecode size of a trivial method to be inlined")    \
3193           range(0, max_jint)                                                \
3194                                                                             \
3195   product(intx, MinInliningThreshold, 250,                                  \
3196           "The minimum invocation count a method needs to have to be "      \
3197           "inlined")                                                        \
3198           range(0, max_jint)                                                \
3199                                                                             \
3200   develop(intx, MethodHistogramCutoff, 100,                                 \
3201           "The cutoff value for method invocation histogram (+CountCalls)") \
3202                                                                             \
3203   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3204           "Number of interpreted methods to show in profile")               \
3205                                                                             \
3206   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3207           "Number of compiled methods to show in profile")                  \
3208                                                                             \
3209   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3210           "Number of stub methods to show in profile")                      \
3211                                                                             \
3212   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3213           "Number of runtime stub nodes to show in profile")                \
3214                                                                             \
3215   product(intx, ProfileIntervalsTicks, 100,                                 \
3216           "Number of ticks between printing of interval profile "           \
3217           "(+ProfileIntervals)")                                            \
3218           range(0, max_intx)                                                \
3219                                                                             \
3220   notproduct(intx, ScavengeALotInterval,     1,                             \
3221           "Interval between which scavenge will occur with +ScavengeALot")  \
3222                                                                             \
3223   notproduct(intx, FullGCALotInterval,     1,                               \
3224           "Interval between which full gc will occur with +FullGCALot")     \
3225                                                                             \
3226   notproduct(intx, FullGCALotStart,     0,                                  \
3227           "For which invocation to start FullGCAlot")                       \
3228                                                                             \
3229   notproduct(intx, FullGCALotDummies,  32*K,                                \
3230           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3231           "to move")                                                        \
3232                                                                             \
3233   develop(intx, DontYieldALotInterval,    10,                               \
3234           "Interval between which yields will be dropped (milliseconds)")   \
3235                                                                             \
3236   develop(intx, MinSleepInterval,     1,                                    \
3237           "Minimum sleep() interval (milliseconds) when "                   \
3238           "ConvertSleepToYield is off (used for Solaris)")                  \
3239                                                                             \
3240   develop(intx, ProfilerPCTickThreshold,    15,                             \
3241           "Number of ticks in a PC buckets to be a hotspot")                \
3242                                                                             \
3243   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3244           "Number of exits until DeoptimizeALot kicks in")                  \
3245                                                                             \
3246   notproduct(intx, ZombieALotInterval,     5,                               \
3247           "Number of exits until ZombieALot kicks in")                      \
3248                                                                             \
3249   diagnostic(intx, MallocVerifyInterval,     0,                             \
3250           "If non-zero, verify C heap after every N calls to "              \
3251           "malloc/realloc/free")                                            \
3252           range(0, max_intx)                                                \
3253                                                                             \
3254   diagnostic(intx, MallocVerifyStart,     0,                                \
3255           "If non-zero, start verifying C heap after Nth call to "          \
3256           "malloc/realloc/free")                                            \
3257           range(0, max_intx)                                                \
3258                                                                             \
3259   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3260           "If non-zero, maximum number of words that malloc/realloc can "   \
3261           "allocate (for testing only)")                                    \
3262           range(0, max_uintx)                                               \
3263                                                                             \
3264   product(intx, TypeProfileWidth, 2,                                        \
3265           "Number of receiver types to record in call/cast profile")        \
3266           range(0, 8)                                                       \
3267                                                                             \
3268   experimental(intx, MethodProfileWidth, 0,                                 \
3269           "Number of methods to record in call profile")                    \
3270                                                                             \
3271   develop(intx, BciProfileWidth,      2,                                    \
3272           "Number of return bci's to record in ret profile")                \
3273                                                                             \
3274   product(intx, PerMethodRecompilationCutoff, 400,                          \
3275           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3276           range(-1, max_intx)                                               \
3277                                                                             \
3278   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3279           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3280           range(-1, max_intx)                                               \
3281                                                                             \
3282   product(intx, PerMethodTrapLimit,  100,                                   \
3283           "Limit on traps (of one kind) in a method (includes inlines)")    \
3284           range(0, max_jint)                                                \
3285                                                                             \
3286   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3287           "Limit on speculative traps (of one kind) in a method "           \
3288           "(includes inlines)")                                             \
3289           range(0, max_jint)                                                \
3290                                                                             \
3291   product(intx, PerBytecodeTrapLimit,  4,                                   \
3292           "Limit on traps (of one kind) at a particular BCI")               \
3293           range(0, max_jint)                                                \
3294                                                                             \
3295   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3296           "Extra method data trap entries for speculation")                 \
3297                                                                             \
3298   develop(intx, InlineFrequencyRatio,    20,                                \
3299           "Ratio of call site execution to caller method invocation")       \
3300           range(0, max_jint)                                                \
3301                                                                             \
3302   develop_pd(intx, InlineFrequencyCount,                                    \
3303           "Count of call site execution necessary to trigger frequent "     \
3304           "inlining")                                                       \
3305           range(0, max_jint)                                                \
3306                                                                             \
3307   develop(intx, InlineThrowCount,    50,                                    \
3308           "Force inlining of interpreted methods that throw this often")    \
3309           range(0, max_jint)                                                \
3310                                                                             \
3311   develop(intx, InlineThrowMaxSize,   200,                                  \
3312           "Force inlining of throwing methods smaller than this")           \
3313           range(0, max_jint)                                                \
3314                                                                             \
3315   develop(intx, ProfilerNodeSize,  1024,                                    \
3316           "Size in K to allocate for the Profile Nodes of each thread")     \
3317           range(0, 1024)                                                    \
3318                                                                             \
3319   /* gc parameters */                                                       \
3320   product(size_t, InitialHeapSize, 0,                                       \
3321           "Initial heap size (in bytes); zero means use ergonomics")        \
3322           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3323                                                                             \
3324   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3325           "Maximum heap size (in bytes)")                                   \
3326           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3327                                                                             \
3328   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3329           "Initial tenured generation size (in bytes)")                     \
3330                                                                             \
3331   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3332           "Initial new generation size (in bytes)")                         \
3333           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3334                                                                             \
3335   product(size_t, MaxNewSize, max_uintx,                                    \
3336           "Maximum new generation size (in bytes), max_uintx means set "    \
3337           "ergonomically")                                                  \
3338                                                                             \
3339   product(size_t, PretenureSizeThreshold, 0,                                \
3340           "Maximum size in bytes of objects allocated in DefNew "           \
3341           "generation; zero means no maximum")                              \
3342                                                                             \
3343   product(size_t, MinTLABSize, 2*K,                                         \
3344           "Minimum allowed TLAB size (in bytes)")                           \
3345           range(1, max_uintx)                                               \
3346           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3347                                                                             \
3348   product(size_t, TLABSize, 0,                                              \
3349           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3350           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3351                                                                             \
3352   product(size_t, YoungPLABSize, 4096,                                      \
3353           "Size of young gen promotion LAB's (in HeapWords)")               \
3354           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3355                                                                             \
3356   product(size_t, OldPLABSize, 1024,                                        \
3357           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3358           "of blocks to attempt to claim when refilling CMS LAB's")         \
3359           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3360                                                                             \
3361   product(uintx, TLABAllocationWeight, 35,                                  \
3362           "Allocation averaging weight")                                    \
3363           range(0, 100)                                                     \
3364                                                                             \
3365   /* Limit the lower bound of this flag to 1 as it is used  */              \
3366   /* in a division expression.                              */              \
3367   product(uintx, TLABWasteTargetPercent, 1,                                 \
3368           "Percentage of Eden that can be wasted")                          \
3369           range(1, 100)                                                     \
3370                                                                             \
3371   product(uintx, TLABRefillWasteFraction,    64,                            \
3372           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3373           range(1, max_uintx)                                               \
3374                                                                             \
3375   product(uintx, TLABWasteIncrement,    4,                                  \
3376           "Increment allowed waste at slow allocation")                     \
3377                                                                             \
3378   product(uintx, SurvivorRatio, 8,                                          \
3379           "Ratio of eden/survivor space size")                              \
3380           range(1, max_uintx-2)                                             \
3381           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3382                                                                             \
3383   product(uintx, NewRatio, 2,                                               \
3384           "Ratio of old/new generation sizes")                              \
3385           range(0, max_uintx-1)                                             \
3386                                                                             \
3387   product_pd(size_t, NewSizeThreadIncrease,                                 \
3388           "Additional size added to desired new generation size per "       \
3389           "non-daemon thread (in bytes)")                                   \
3390                                                                             \
3391   product_pd(size_t, MetaspaceSize,                                         \
3392           "Initial size of Metaspaces (in bytes)")                          \
3393           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3394                                                                             \
3395   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3396           "Maximum size of Metaspaces (in bytes)")                          \
3397           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3398                                                                             \
3399   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3400           "Maximum size of class area in Metaspace when compressed "        \
3401           "class pointers are used")                                        \
3402           range(1*M, 3*G)                                                   \
3403                                                                             \
3404   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3405           "The minimum percentage of heap free after GC to avoid expansion."\
3406           " For most GCs this applies to the old generation. In G1 and"     \
3407           " ParallelGC it applies to the whole heap.")                      \
3408           range(0, 100)                                                     \
3409           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3410                                                                             \
3411   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3412           "The maximum percentage of heap free after GC to avoid shrinking."\
3413           " For most GCs this applies to the old generation. In G1 and"     \
3414           " ParallelGC it applies to the whole heap.")                      \
3415           range(0, 100)                                                     \
3416           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3417                                                                             \
3418   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3419           "Number of milliseconds per MB of free space in the heap")        \
3420           range(0, max_intx)                                                \
3421           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3422                                                                             \
3423   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3424           "The minimum change in heap space due to GC (in bytes)")          \
3425                                                                             \
3426   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3427           "The minimum expansion of Metaspace (in bytes)")                  \
3428                                                                             \
3429   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3430           "The maximum percentage of Metaspace free after GC to avoid "     \
3431           "shrinking")                                                      \
3432           range(0, 100)                                                     \
3433           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3434                                                                             \
3435   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3436           "The minimum percentage of Metaspace free after GC to avoid "     \
3437           "expansion")                                                      \
3438           range(0, 99)                                                      \
3439           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3440                                                                             \
3441   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3442           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3443                                                                             \
3444   product(uintx, QueuedAllocationWarningCount, 0,                           \
3445           "Number of times an allocation that queues behind a GC "          \
3446           "will retry before printing a warning")                           \
3447                                                                             \
3448   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3449           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3450                                                                             \
3451   diagnostic(intx, VerifyGCLevel,     0,                                    \
3452           "Generation level at which to start +VerifyBefore/AfterGC")       \
3453           range(0, 1)                                                       \
3454                                                                             \
3455   product(uintx, MaxTenuringThreshold,    15,                               \
3456           "Maximum value for tenuring threshold")                           \
3457           range(0, markOopDesc::max_age + 1)                                \
3458           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3459                                                                             \
3460   product(uintx, InitialTenuringThreshold,    7,                            \
3461           "Initial value for tenuring threshold")                           \
3462           range(0, markOopDesc::max_age + 1)                                \
3463           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3464                                                                             \
3465   product(uintx, TargetSurvivorRatio,    50,                                \
3466           "Desired percentage of survivor space used after scavenge")       \
3467           range(0, 100)                                                     \
3468                                                                             \
3469   product(uintx, MarkSweepDeadRatio,     5,                                 \
3470           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3471           "Serial mark sweep treats this as both the minimum and maximum "  \
3472           "value. "                                                         \
3473           "CMS uses this value only if it falls back to mark sweep. "       \
3474           "Par compact uses a variable scale based on the density of the "  \
3475           "generation and treats this as the maximum value when the heap "  \
3476           "is either completely full or completely empty.  Par compact "    \
3477           "also has a smaller default value; see arguments.cpp.")           \
3478           range(0, 100)                                                     \
3479                                                                             \
3480   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3481           "How often should we fully compact the heap (ignoring the dead "  \
3482           "space parameters)")                                              \
3483           range(1, max_uintx)                                               \
3484                                                                             \
3485   product(intx, PrintCMSStatistics, 0,                                      \
3486           "Statistics for CMS")                                             \
3487                                                                             \
3488   product(bool, PrintCMSInitiationStatistics, false,                        \
3489           "Statistics for initiating a CMS collection")                     \
3490                                                                             \
3491   product(intx, PrintFLSStatistics, 0,                                      \
3492           "Statistics for CMS' FreeListSpace")                              \
3493                                                                             \
3494   product(intx, PrintFLSCensus, 0,                                          \
3495           "Census for CMS' FreeListSpace")                                  \
3496                                                                             \
3497   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3498           "Delay between expansion and allocation (in milliseconds)")       \
3499                                                                             \
3500   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3501           "Delay in scheduling GC workers (in milliseconds)")               \
3502                                                                             \
3503   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3504           "(Unstable) Number of times to iterate in safepoint loop "        \
3505           "before blocking VM threads ")                                    \
3506           range(-1, max_jint-1)                                             \
3507                                                                             \
3508   product(intx, DeferPollingPageLoopCount,     -1,                          \
3509           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3510           "before changing safepoint polling page to RO ")                  \
3511           range(-1, max_jint-1)                                             \
3512                                                                             \
3513   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3514           range(0, max_intx)                                                \
3515                                                                             \
3516   product(bool, PSChunkLargeArrays, true,                                   \
3517           "Process large arrays in chunks")                                 \
3518                                                                             \
3519   product(uintx, GCDrainStackTargetSize, 64,                                \
3520           "Number of entries we will try to leave on the stack "            \
3521           "during parallel gc")                                             \
3522                                                                             \
3523   /* stack parameters */                                                    \
3524   product_pd(intx, StackYellowPages,                                        \
3525           "Number of yellow zone (recoverable overflows) pages")            \
3526           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3527                                                                             \
3528   product_pd(intx, StackRedPages,                                           \
3529           "Number of red zone (unrecoverable overflows) pages")             \
3530           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3531                                                                             \
3532   /* greater stack shadow pages can't generate instruction to bang stack */ \
3533   product_pd(intx, StackShadowPages,                                        \
3534           "Number of shadow zone (for overflow checking) pages "            \
3535           "this should exceed the depth of the VM and native call stack")   \
3536           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3537                                                                             \
3538   product_pd(intx, ThreadStackSize,                                         \
3539           "Thread Stack Size (in Kbytes)")                                  \
3540           range(0, max_intx-os::vm_page_size())                             \
3541                                                                             \
3542   product_pd(intx, VMThreadStackSize,                                       \
3543           "Non-Java Thread Stack Size (in Kbytes)")                         \
3544           range(0, max_intx/(1 * K))                                        \
3545                                                                             \
3546   product_pd(intx, CompilerThreadStackSize,                                 \
3547           "Compiler Thread Stack Size (in Kbytes)")                         \
3548           range(0, max_intx)                                                \
3549                                                                             \
3550   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3551           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3552                                                                             \
3553   /* code cache parameters                                    */            \
3554   /* ppc64/tiered compilation has large code-entry alignment. */            \
3555   develop(uintx, CodeCacheSegmentSize,                                      \
3556           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3557           "Code cache segment size (in bytes) - smallest unit of "          \
3558           "allocation")                                                     \
3559           range(1, 1024)                                                    \
3560           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3561                                                                             \
3562   develop_pd(intx, CodeEntryAlignment,                                      \
3563           "Code entry alignment for generated code (in bytes)")             \
3564           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3565                                                                             \
3566   product_pd(intx, OptoLoopAlignment,                                       \
3567           "Align inner loops to zero relative to this modulus")             \
3568           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3569                                                                             \
3570   product_pd(uintx, InitialCodeCacheSize,                                   \
3571           "Initial code cache size (in bytes)")                             \
3572           range(0, max_uintx)                                               \
3573                                                                             \
3574   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3575           "Minimum code cache size (in bytes) required to start VM.")       \
3576           range(0, max_uintx)                                               \
3577                                                                             \
3578   product(bool, SegmentedCodeCache, false,                                  \
3579           "Use a segmented code cache")                                     \
3580                                                                             \
3581   product_pd(uintx, ReservedCodeCacheSize,                                  \
3582           "Reserved code cache size (in bytes) - maximum code cache size")  \
3583           range(0, max_uintx)                                               \
3584                                                                             \
3585   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3586           "Size of code heap with non-profiled methods (in bytes)")         \
3587           range(0, max_uintx)                                               \
3588                                                                             \
3589   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3590           "Size of code heap with profiled methods (in bytes)")             \
3591           range(0, max_uintx)                                               \
3592                                                                             \
3593   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3594           "Size of code heap with non-nmethods (in bytes)")                 \
3595           range(0, max_uintx)                                               \
3596                                                                             \
3597   product_pd(uintx, CodeCacheExpansionSize,                                 \
3598           "Code cache expansion size (in bytes)")                           \
3599           range(0, max_uintx)                                               \
3600                                                                             \
3601   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3602           "Minimum number of segments in a code cache block")               \
3603           range(1, 100)                                                     \
3604                                                                             \
3605   notproduct(bool, ExitOnFullCodeCache, false,                              \
3606           "Exit the VM if we fill the code cache")                          \
3607                                                                             \
3608   product(bool, UseCodeCacheFlushing, true,                                 \
3609           "Remove cold/old nmethods from the code cache")                   \
3610                                                                             \
3611   product(uintx, StartAggressiveSweepingAt, 10,                             \
3612           "Start aggressive sweeping if X[%] of the code cache is free."    \
3613           "Segmented code cache: X[%] of the non-profiled heap."            \
3614           "Non-segmented code cache: X[%] of the total code cache")         \
3615           range(0, 100)                                                     \
3616                                                                             \
3617   /* interpreter debugging */                                               \
3618   develop(intx, BinarySwitchThreshold, 5,                                   \
3619           "Minimal number of lookupswitch entries for rewriting to binary " \
3620           "switch")                                                         \
3621                                                                             \
3622   develop(intx, StopInterpreterAt, 0,                                       \
3623           "Stop interpreter execution at specified bytecode number")        \
3624                                                                             \
3625   develop(intx, TraceBytecodesAt, 0,                                        \
3626           "Trace bytecodes starting with specified bytecode number")        \
3627                                                                             \
3628   /* compiler interface */                                                  \
3629   develop(intx, CIStart, 0,                                                 \
3630           "The id of the first compilation to permit")                      \
3631                                                                             \
3632   develop(intx, CIStop, max_jint,                                           \
3633           "The id of the last compilation to permit")                       \
3634                                                                             \
3635   develop(intx, CIStartOSR, 0,                                              \
3636           "The id of the first osr compilation to permit "                  \
3637           "(CICountOSR must be on)")                                        \
3638                                                                             \
3639   develop(intx, CIStopOSR, max_jint,                                        \
3640           "The id of the last osr compilation to permit "                   \
3641           "(CICountOSR must be on)")                                        \
3642                                                                             \
3643   develop(intx, CIBreakAtOSR, -1,                                           \
3644           "The id of osr compilation to break at")                          \
3645                                                                             \
3646   develop(intx, CIBreakAt, -1,                                              \
3647           "The id of compilation to break at")                              \
3648                                                                             \
3649   product(ccstrlist, CompileOnly, "",                                       \
3650           "List of methods (pkg/class.name) to restrict compilation to")    \
3651                                                                             \
3652   product(ccstr, CompileCommandFile, NULL,                                  \
3653           "Read compiler commands from this file [.hotspot_compiler]")      \
3654                                                                             \
3655   product(ccstrlist, CompileCommand, "",                                    \
3656           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3657                                                                             \
3658   develop(bool, ReplayCompiles, false,                                      \
3659           "Enable replay of compilations from ReplayDataFile")              \
3660                                                                             \
3661   product(ccstr, ReplayDataFile, NULL,                                      \
3662           "File containing compilation replay information"                  \
3663           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3664                                                                             \
3665    product(ccstr, InlineDataFile, NULL,                                     \
3666           "File containing inlining replay information"                     \
3667           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3668                                                                             \
3669   develop(intx, ReplaySuppressInitializers, 2,                              \
3670           "Control handling of class initialization during replay: "        \
3671           "0 - don't do anything special; "                                 \
3672           "1 - treat all class initializers as empty; "                     \
3673           "2 - treat class initializers for application classes as empty; " \
3674           "3 - allow all class initializers to run during bootstrap but "   \
3675           "    pretend they are empty after starting replay")               \
3676           range(0, 3)                                                       \
3677                                                                             \
3678   develop(bool, ReplayIgnoreInitErrors, false,                              \
3679           "Ignore exceptions thrown during initialization for replay")      \
3680                                                                             \
3681   product(bool, DumpReplayDataOnError, true,                                \
3682           "Record replay data for crashing compiler threads")               \
3683                                                                             \
3684   product(bool, CICompilerCountPerCPU, false,                               \
3685           "1 compiler thread for log(N CPUs)")                              \
3686                                                                             \
3687   develop(intx, CIFireOOMAt,    -1,                                         \
3688           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3689           "(non-negative value throws OOM after this many CI accesses "     \
3690           "in each compile)")                                               \
3691   notproduct(intx, CICrashAt, -1,                                           \
3692           "id of compilation to trigger assert in compiler thread for "     \
3693           "the purpose of testing, e.g. generation of replay data")         \
3694   notproduct(bool, CIObjectFactoryVerify, false,                            \
3695           "enable potentially expensive verification in ciObjectFactory")   \
3696                                                                             \
3697   /* Priorities */                                                          \
3698   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3699                                                                             \
3700   product(intx, ThreadPriorityPolicy, 0,                                    \
3701           "0 : Normal.                                                     "\
3702           "    VM chooses priorities that are appropriate for normal       "\
3703           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3704           "    to normal native priority. Java priorities below "           \
3705           "    NORM_PRIORITY map to lower native priority values. On       "\
3706           "    Windows applications are allowed to use higher native       "\
3707           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3708           "    not use the highest possible native priority,               "\
3709           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3710           "    system threads. On Linux thread priorities are ignored      "\
3711           "    because the OS does not support static priority in          "\
3712           "    SCHED_OTHER scheduling class which is the only choice for   "\
3713           "    non-root, non-realtime applications.                        "\
3714           "1 : Aggressive.                                                 "\
3715           "    Java thread priorities map over to the entire range of      "\
3716           "    native thread priorities. Higher Java thread priorities map "\
3717           "    to higher native thread priorities. This policy should be   "\
3718           "    used with care, as sometimes it can cause performance       "\
3719           "    degradation in the application and/or the entire system. On "\
3720           "    Linux this policy requires root privilege.")                 \
3721           range(0, 1)                                                       \
3722                                                                             \
3723   product(bool, ThreadPriorityVerbose, false,                               \
3724           "Print priority changes")                                         \
3725                                                                             \
3726   product(intx, CompilerThreadPriority, -1,                                 \
3727           "The native priority at which compiler threads should run "       \
3728           "(-1 means no change)")                                           \
3729           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3730                                                                             \
3731   product(intx, VMThreadPriority, -1,                                       \
3732           "The native priority at which the VM thread should run "          \
3733           "(-1 means no change)")                                           \
3734           range(-1, 127)                                                    \
3735                                                                             \
3736   product(bool, CompilerThreadHintNoPreempt, true,                          \
3737           "(Solaris only) Give compiler threads an extra quanta")           \
3738                                                                             \
3739   product(bool, VMThreadHintNoPreempt, false,                               \
3740           "(Solaris only) Give VM thread an extra quanta")                  \
3741                                                                             \
3742   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3743           "Map Java priorities to OS priorities")                           \
3744           range(-1, 127)                                                    \
3745                                                                             \
3746   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3747           "Map Java priorities to OS priorities")                           \
3748           range(-1, 127)                                                    \
3749                                                                             \
3750   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3751           "Map Java priorities to OS priorities")                           \
3752           range(-1, 127)                                                    \
3753                                                                             \
3754   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3755           "Map Java priorities to OS priorities")                           \
3756           range(-1, 127)                                                    \
3757                                                                             \
3758   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3759           "Map Java priorities to OS priorities")                           \
3760           range(-1, 127)                                                    \
3761                                                                             \
3762   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3763           "Map Java priorities to OS priorities")                           \
3764           range(-1, 127)                                                    \
3765                                                                             \
3766   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3767           "Map Java priorities to OS priorities")                           \
3768           range(-1, 127)                                                    \
3769                                                                             \
3770   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3771           "Map Java priorities to OS priorities")                           \
3772           range(-1, 127)                                                    \
3773                                                                             \
3774   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3775           "Map Java priorities to OS priorities")                           \
3776           range(-1, 127)                                                    \
3777                                                                             \
3778   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3779           "Map Java priorities to OS priorities")                           \
3780           range(-1, 127)                                                    \
3781                                                                             \
3782   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3783           "Java thread priority 10 maps to critical scheduling priority")   \
3784                                                                             \
3785   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3786           "Compiler thread(s) run at critical scheduling priority")         \
3787                                                                             \
3788   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3789           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3790                                                                             \
3791   /* compiler debugging */                                                  \
3792   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3793           "First class to consider when using +CompileTheWorld")            \
3794                                                                             \
3795   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3796           "Last class to consider when using +CompileTheWorld")             \
3797                                                                             \
3798   develop(intx, NewCodeParameter,      0,                                   \
3799           "Testing Only: Create a dedicated integer parameter before "      \
3800           "putback")                                                        \
3801                                                                             \
3802   /* new oopmap storage allocation */                                       \
3803   develop(intx, MinOopMapAllocation,     8,                                 \
3804           "Minimum number of OopMap entries in an OopMapSet")               \
3805                                                                             \
3806   /* Background Compilation */                                              \
3807   develop(intx, LongCompileThreshold,     50,                               \
3808           "Used with +TraceLongCompiles")                                   \
3809                                                                             \
3810   /* recompilation */                                                       \
3811   product_pd(intx, CompileThreshold,                                        \
3812           "number of interpreted method invocations before (re-)compiling") \
3813           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3814                                                                             \
3815   product(double, CompileThresholdScaling, 1.0,                             \
3816           "Factor to control when first compilation happens "               \
3817           "(both with and without tiered compilation): "                    \
3818           "values greater than 1.0 delay counter overflow, "                \
3819           "values between 0 and 1.0 rush counter overflow, "                \
3820           "value of 1.0 leaves compilation thresholds unchanged "           \
3821           "value of 0.0 is equivalent to -Xint. "                           \
3822           ""                                                                \
3823           "Flag can be set as per-method option. "                          \
3824           "If a value is specified for a method, compilation thresholds "   \
3825           "for that method are scaled by both the value of the global flag "\
3826           "and the value of the per-method flag.")                          \
3827           range(0.0, DBL_MAX)                                               \
3828                                                                             \
3829   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3830           "Interpreter (tier 0) invocation notification frequency")         \
3831           range(0, 30)                                                      \
3832                                                                             \
3833   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3834           "C1 without MDO (tier 2) invocation notification frequency")      \
3835           range(0, 30)                                                      \
3836                                                                             \
3837   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3838           "C1 with MDO profiling (tier 3) invocation notification "         \
3839           "frequency")                                                      \
3840           range(0, 30)                                                      \
3841                                                                             \
3842   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3843           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3844           range(0, 30)                                                      \
3845                                                                             \
3846   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3847           "Interpreter (tier 0) invocation notification frequency")         \
3848           range(0, 30)                                                      \
3849                                                                             \
3850   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3851           "C1 without MDO (tier 2) invocation notification frequency")      \
3852           range(0, 30)                                                      \
3853                                                                             \
3854   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3855           "C1 with MDO profiling (tier 3) invocation notification "         \
3856           "frequency")                                                      \
3857           range(0, 30)                                                      \
3858                                                                             \
3859   product(intx, Tier2CompileThreshold, 0,                                   \
3860           "threshold at which tier 2 compilation is invoked")               \
3861           range(0, max_jint)                                                \
3862                                                                             \
3863   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3864           "Back edge threshold at which tier 2 compilation is invoked")     \
3865           range(0, max_jint)                                                \
3866                                                                             \
3867   product(intx, Tier3InvocationThreshold, 200,                              \
3868           "Compile if number of method invocations crosses this "           \
3869           "threshold")                                                      \
3870           range(0, max_jint)                                                \
3871                                                                             \
3872   product(intx, Tier3MinInvocationThreshold, 100,                           \
3873           "Minimum invocation to compile at tier 3")                        \
3874           range(0, max_jint)                                                \
3875                                                                             \
3876   product(intx, Tier3CompileThreshold, 2000,                                \
3877           "Threshold at which tier 3 compilation is invoked (invocation "   \
3878           "minimum must be satisfied)")                                     \
3879           range(0, max_jint)                                                \
3880                                                                             \
3881   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3882           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3883           range(0, max_jint)                                                \
3884                                                                             \
3885   product(intx, Tier4InvocationThreshold, 5000,                             \
3886           "Compile if number of method invocations crosses this "           \
3887           "threshold")                                                      \
3888           range(0, max_jint)                                                \
3889                                                                             \
3890   product(intx, Tier4MinInvocationThreshold, 600,                           \
3891           "Minimum invocation to compile at tier 4")                        \
3892           range(0, max_jint)                                                \
3893                                                                             \
3894   product(intx, Tier4CompileThreshold, 15000,                               \
3895           "Threshold at which tier 4 compilation is invoked (invocation "   \
3896           "minimum must be satisfied")                                      \
3897           range(0, max_jint)                                                \
3898                                                                             \
3899   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3900           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3901           range(0, max_jint)                                                \
3902                                                                             \
3903   product(intx, Tier3DelayOn, 5,                                            \
3904           "If C2 queue size grows over this amount per compiler thread "    \
3905           "stop compiling at tier 3 and start compiling at tier 2")         \
3906           range(0, max_jint)                                                \
3907                                                                             \
3908   product(intx, Tier3DelayOff, 2,                                           \
3909           "If C2 queue size is less than this amount per compiler thread "  \
3910           "allow methods compiled at tier 2 transition to tier 3")          \
3911           range(0, max_jint)                                                \
3912                                                                             \
3913   product(intx, Tier3LoadFeedback, 5,                                       \
3914           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3915           "reaches this amount per compiler thread")                        \
3916           range(0, max_jint)                                                \
3917                                                                             \
3918   product(intx, Tier4LoadFeedback, 3,                                       \
3919           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3920           "reaches this amount per compiler thread")                        \
3921           range(0, max_jint)                                                \
3922                                                                             \
3923   product(intx, TieredCompileTaskTimeout, 50,                               \
3924           "Kill compile task if method was not used within "                \
3925           "given timeout in milliseconds")                                  \
3926           range(0, max_intx)                                                \
3927                                                                             \
3928   product(intx, TieredStopAtLevel, 4,                                       \
3929           "Stop at given compilation level")                                \
3930           range(0, 4)                                                       \
3931                                                                             \
3932   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3933           "Start profiling in interpreter if the counters exceed tier 3 "   \
3934           "thresholds by the specified percentage")                         \
3935           range(0, max_jint)                                                \
3936                                                                             \
3937   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3938           "Increase the compile threshold for C1 compilation if the code "  \
3939           "cache is filled by the specified percentage")                    \
3940           range(0, 99)                                                      \
3941                                                                             \
3942   product(intx, TieredRateUpdateMinTime, 1,                                 \
3943           "Minimum rate sampling interval (in milliseconds)")               \
3944           range(0, max_intx)                                                \
3945                                                                             \
3946   product(intx, TieredRateUpdateMaxTime, 25,                                \
3947           "Maximum rate sampling interval (in milliseconds)")               \
3948           range(0, max_intx)                                                \
3949                                                                             \
3950   product_pd(bool, TieredCompilation,                                       \
3951           "Enable tiered compilation")                                      \
3952                                                                             \
3953   product(bool, PrintTieredEvents, false,                                   \
3954           "Print tiered events notifications")                              \
3955                                                                             \
3956   product_pd(intx, OnStackReplacePercentage,                                \
3957           "NON_TIERED number of method invocations/branches (expressed as " \
3958           "% of CompileThreshold) before (re-)compiling OSR code")          \
3959           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3960                                                                             \
3961   product(intx, InterpreterProfilePercentage, 33,                           \
3962           "NON_TIERED number of method invocations/branches (expressed as " \
3963           "% of CompileThreshold) before profiling in the interpreter")     \
3964           range(0, 100)                                                     \
3965                                                                             \
3966   develop(intx, MaxRecompilationSearchLength,    10,                        \
3967           "The maximum number of frames to inspect when searching for "     \
3968           "recompilee")                                                     \
3969                                                                             \
3970   develop(intx, MaxInterpretedSearchLength,     3,                          \
3971           "The maximum number of interpreted frames to skip when searching "\
3972           "for recompilee")                                                 \
3973                                                                             \
3974   develop(intx, DesiredMethodLimit,  8000,                                  \
3975           "The desired maximum method size (in bytecodes) after inlining")  \
3976                                                                             \
3977   develop(intx, HugeMethodLimit,  8000,                                     \
3978           "Don't compile methods larger than this if "                      \
3979           "+DontCompileHugeMethods")                                        \
3980                                                                             \
3981   /* New JDK 1.4 reflection implementation */                               \
3982                                                                             \
3983   develop(intx, FastSuperclassLimit, 8,                                     \
3984           "Depth of hardwired instanceof accelerator array")                \
3985                                                                             \
3986   /* Properties for Java libraries  */                                      \
3987                                                                             \
3988   product(size_t, MaxDirectMemorySize, 0,                                   \
3989           "Maximum total size of NIO direct-buffer allocations")            \
3990           range(0, (size_t)SIZE_MAX)                                        \
3991                                                                             \
3992   /* Flags used for temporary code during development  */                   \
3993                                                                             \
3994   diagnostic(bool, UseNewCode, false,                                       \
3995           "Testing Only: Use the new version while testing")                \
3996                                                                             \
3997   diagnostic(bool, UseNewCode2, false,                                      \
3998           "Testing Only: Use the new version while testing")                \
3999                                                                             \
4000   diagnostic(bool, UseNewCode3, false,                                      \
4001           "Testing Only: Use the new version while testing")                \
4002                                                                             \
4003   /* flags for performance data collection */                               \
4004                                                                             \
4005   product(bool, UsePerfData, falseInEmbedded,                               \
4006           "Flag to disable jvmstat instrumentation for performance testing "\
4007           "and problem isolation purposes")                                 \
4008                                                                             \
4009   product(bool, PerfDataSaveToFile, false,                                  \
4010           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
4011                                                                             \
4012   product(ccstr, PerfDataSaveFile, NULL,                                    \
4013           "Save PerfData memory to the specified absolute pathname. "       \
4014           "The string %p in the file name (if present) "                    \
4015           "will be replaced by pid")                                        \
4016                                                                             \
4017   product(intx, PerfDataSamplingInterval, 50,                               \
4018           "Data sampling interval (in milliseconds)")                       \
4019           range(PeriodicTask::min_interval, max_jint)                       \
4020           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
4021                                                                             \
4022   develop(bool, PerfTraceDataCreation, false,                               \
4023           "Trace creation of Performance Data Entries")                     \
4024                                                                             \
4025   develop(bool, PerfTraceMemOps, false,                                     \
4026           "Trace PerfMemory create/attach/detach calls")                    \
4027                                                                             \
4028   product(bool, PerfDisableSharedMem, false,                                \
4029           "Store performance data in standard memory")                      \
4030                                                                             \
4031   product(intx, PerfDataMemorySize, 64*K,                                   \
4032           "Size of performance data memory region. Will be rounded "        \
4033           "up to a multiple of the native os page size.")                   \
4034           range(128, 32*64*K)                                               \
4035                                                                             \
4036   product(intx, PerfMaxStringConstLength, 1024,                             \
4037           "Maximum PerfStringConstant string length before truncation")     \
4038           range(32, 32*K)                                                   \
4039                                                                             \
4040   product(bool, PerfAllowAtExitRegistration, false,                         \
4041           "Allow registration of atexit() methods")                         \
4042                                                                             \
4043   product(bool, PerfBypassFileSystemCheck, false,                           \
4044           "Bypass Win32 file system criteria checks (Windows Only)")        \
4045                                                                             \
4046   product(intx, UnguardOnExecutionViolation, 0,                             \
4047           "Unguard page and retry on no-execute fault (Win32 only) "        \
4048           "0=off, 1=conservative, 2=aggressive")                            \
4049           range(0, 2)                                                       \
4050                                                                             \
4051   /* Serviceability Support */                                              \
4052                                                                             \
4053   product(bool, ManagementServer, false,                                    \
4054           "Create JMX Management Server")                                   \
4055                                                                             \
4056   product(bool, DisableAttachMechanism, false,                              \
4057           "Disable mechanism that allows tools to attach to this VM")       \
4058                                                                             \
4059   product(bool, StartAttachListener, false,                                 \
4060           "Always start Attach Listener at VM startup")                     \
4061                                                                             \
4062   manageable(bool, PrintConcurrentLocks, false,                             \
4063           "Print java.util.concurrent locks in thread dump")                \
4064                                                                             \
4065   product(bool, TransmitErrorReport, false,                                 \
4066           "Enable error report transmission on erroneous termination")      \
4067                                                                             \
4068   product(ccstr, ErrorReportServer, NULL,                                   \
4069           "Override built-in error report server address")                  \
4070                                                                             \
4071   /* Shared spaces */                                                       \
4072                                                                             \
4073   product(bool, UseSharedSpaces, true,                                      \
4074           "Use shared spaces for metadata")                                 \
4075                                                                             \
4076   product(bool, VerifySharedSpaces, false,                                  \
4077           "Verify shared spaces (false for default archive, true for "      \
4078           "archive specified by -XX:SharedArchiveFile)")                    \
4079                                                                             \
4080   product(bool, RequireSharedSpaces, false,                                 \
4081           "Require shared spaces for metadata")                             \
4082                                                                             \
4083   product(bool, DumpSharedSpaces, false,                                    \
4084           "Special mode: JVM reads a class list, loads classes, builds "    \
4085           "shared spaces, and dumps the shared spaces to a file to be "     \
4086           "used in future JVM runs")                                        \
4087                                                                             \
4088   product(bool, PrintSharedSpaces, false,                                   \
4089           "Print usage of shared spaces")                                   \
4090                                                                             \
4091   product(bool, PrintSharedArchiveAndExit, false,                           \
4092           "Print shared archive file contents")                             \
4093                                                                             \
4094   product(bool, PrintSharedDictionary, false,                               \
4095           "If PrintSharedArchiveAndExit is true, also print the shared "    \
4096           "dictionary")                                                     \
4097                                                                             \
4098   product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M),      \
4099           "Size of read-write space for metadata (in bytes)")               \
4100                                                                             \
4101   product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M),       \
4102           "Size of read-only space for metadata (in bytes)")                \
4103                                                                             \
4104   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
4105           "Size of the shared miscellaneous data area (in bytes)")          \
4106                                                                             \
4107   product(uintx, SharedMiscCodeSize,    120*K,                              \
4108           "Size of the shared miscellaneous code area (in bytes)")          \
4109                                                                             \
4110   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
4111           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
4112           "Address to allocate shared memory region for class data")        \
4113                                                                             \
4114   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4115           "Average number of symbols per bucket in shared table")           \
4116           range(2, 246)                                                     \
4117                                                                             \
4118   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4119           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4120           "classes. Just exclude them from the shared dictionary.")         \
4121                                                                             \
4122   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4123           "Print generated stub code for method handles")                   \
4124                                                                             \
4125   develop(bool, TraceMethodHandles, false,                                  \
4126           "trace internal method handle operations")                        \
4127                                                                             \
4128   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4129           "perform extra checks when constructing method handles")          \
4130                                                                             \
4131   diagnostic(bool, ShowHiddenFrames, false,                                 \
4132           "show method handle implementation frames (usually hidden)")      \
4133                                                                             \
4134   experimental(bool, TrustFinalNonStaticFields, false,                      \
4135           "trust final non-static declarations for constant folding")       \
4136                                                                             \
4137   diagnostic(bool, FoldStableValues, true,                                  \
4138           "Optimize loads from stable fields (marked w/ @Stable)")          \
4139                                                                             \
4140   develop(bool, TraceInvokeDynamic, false,                                  \
4141           "trace internal invoke dynamic operations")                       \
4142                                                                             \
4143   diagnostic(bool, PauseAtStartup,      false,                              \
4144           "Causes the VM to pause at startup time and wait for the pause "  \
4145           "file to be removed (default: ./vm.paused.<pid>)")                \
4146                                                                             \
4147   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4148           "The file to create and for whose removal to await when pausing " \
4149           "at startup. (default: ./vm.paused.<pid>)")                       \
4150                                                                             \
4151   diagnostic(bool, PauseAtExit, false,                                      \
4152           "Pause and wait for keypress on exit if a debugger is attached")  \
4153                                                                             \
4154   product(bool, ExtendedDTraceProbes,    false,                             \
4155           "Enable performance-impacting dtrace probes")                     \
4156                                                                             \
4157   product(bool, DTraceMethodProbes, false,                                  \
4158           "Enable dtrace probes for method-entry and method-exit")          \
4159                                                                             \
4160   product(bool, DTraceAllocProbes, false,                                   \
4161           "Enable dtrace probes for object allocation")                     \
4162                                                                             \
4163   product(bool, DTraceMonitorProbes, false,                                 \
4164           "Enable dtrace probes for monitor events")                        \
4165                                                                             \
4166   product(bool, RelaxAccessControlCheck, false,                             \
4167           "Relax the access control checks in the verifier")                \
4168                                                                             \
4169   product(uintx, StringTableSize, defaultStringTableSize,                   \
4170           "Number of buckets in the interned String table")                 \
4171           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4172                                                                             \
4173   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4174           "Number of buckets in the JVM internal Symbol table")             \
4175           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4176                                                                             \
4177   product(bool, UseStringDeduplication, false,                              \
4178           "Use string deduplication")                                       \
4179                                                                             \
4180   product(bool, PrintStringDeduplicationStatistics, false,                  \
4181           "Print string deduplication statistics")                          \
4182                                                                             \
4183   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4184           "A string must reach this age (or be promoted to an old region) " \
4185           "to be considered for deduplication")                             \
4186           range(1, markOopDesc::max_age)                                    \
4187                                                                             \
4188   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4189           "Force table resize every time the table is scanned")             \
4190                                                                             \
4191   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4192           "Force table rehash every time the table is scanned")             \
4193                                                                             \
4194   diagnostic(bool, WhiteBoxAPI, false,                                      \
4195           "Enable internal testing APIs")                                   \
4196                                                                             \
4197   product(bool, PrintGCCause, true,                                         \
4198           "Include GC cause in GC logging")                                 \
4199                                                                             \
4200   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4201            "Default survivor space alignment in bytes")                     \
4202            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4203                                                                             \
4204   product(bool , AllowNonVirtualCalls, false,                               \
4205           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4206                                                                             \
4207   product(ccstr, DumpLoadedClassList, NULL,                                 \
4208           "Dump the names all loaded classes, that could be stored into "   \
4209           "the CDS archive, in the specified file")                         \
4210                                                                             \
4211   product(ccstr, SharedClassListFile, NULL,                                 \
4212           "Override the default CDS class list")                            \
4213                                                                             \
4214   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4215           "Override the default location of the CDS archive file")          \
4216                                                                             \
4217   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4218           "Extra classlist for building the CDS archive file")              \
4219                                                                             \
4220   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4221           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4222           "Allocation less than this value will be allocated "              \
4223           "using malloc. Larger allocations will use mmap.")                \
4224                                                                             \
4225   experimental(bool, AlwaysAtomicAccesses, false,                           \
4226           "Accesses to all variables should always be atomic")              \
4227                                                                             \
4228   product(bool, EnableTracing, false,                                       \
4229           "Enable event-based tracing")                                     \
4230                                                                             \
4231   product(bool, UseLockedTracing, false,                                    \
4232           "Use locked-tracing when doing event-based tracing")              \
4233                                                                             \
4234   diagnostic(bool, UseUnalignedAccesses, false,                             \
4235           "Use unaligned memory accesses in Unsafe")                        \
4236                                                                             \
4237   product_pd(bool, PreserveFramePointer,                                    \
4238              "Use the FP register for holding the frame pointer "           \
4239              "and not as a general purpose register.")                      \
4240                                                                             \
4241   diagnostic(bool, CheckIntrinsics, true,                                   \
4242              "When a class C is loaded, check that "                        \
4243              "(1) all intrinsics defined by the VM for class C are present "\
4244              "in the loaded class file and are marked with the "            \
4245              "@HotSpotIntrinsicCandidate annotation, that "                 \
4246              "(2) there is an intrinsic registered for all loaded methods " \
4247              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4248              "annotation, and that "                                        \
4249              "(3) no orphan methods exist for class C (i.e., methods for "  \
4250              "which the VM declares an intrinsic but that are not declared "\
4251              "in the loaded class C. "                                      \
4252              "Check (3) is available only in debug builds.")
4253 
4254 /*
4255  *  Macros for factoring of globals
4256  */
4257 
4258 // Interface macros
4259 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4260 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4261 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4262 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4263 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4264 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4265 #ifdef PRODUCT
4266 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4267 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4268 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4269 #else
4270 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4271 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4272 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4273 #endif // PRODUCT
4274 // Special LP64 flags, product only needed for now.
4275 #ifdef _LP64
4276 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4277 #else
4278 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4279 #endif // _LP64
4280 
4281 // Implementation macros
4282 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4283 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4284 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4285 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4286 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4287 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4288 #ifdef PRODUCT
4289 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4290 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4291 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4292 #else
4293 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4294 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4295 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4296 #endif // PRODUCT
4297 #ifdef _LP64
4298 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4299 #else
4300 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4301 #endif // _LP64
4302 
4303 // Only materialize src code for range checking when required, ignore otherwise
4304 #define IGNORE_RANGE(a, b)
4305 // Only materialize src code for contraint checking when required, ignore otherwise
4306 #define IGNORE_CONSTRAINT(func,type)
4307 
4308 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4309               DECLARE_PD_DEVELOPER_FLAG, \
4310               DECLARE_PRODUCT_FLAG, \
4311               DECLARE_PD_PRODUCT_FLAG, \
4312               DECLARE_DIAGNOSTIC_FLAG, \
4313               DECLARE_EXPERIMENTAL_FLAG, \
4314               DECLARE_NOTPRODUCT_FLAG, \
4315               DECLARE_MANAGEABLE_FLAG, \
4316               DECLARE_PRODUCT_RW_FLAG, \
4317               DECLARE_LP64_PRODUCT_FLAG, \
4318               IGNORE_RANGE, \
4319               IGNORE_CONSTRAINT)
4320 
4321 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4322                  DECLARE_PD_DEVELOPER_FLAG, \
4323                  DECLARE_PRODUCT_FLAG, \
4324                  DECLARE_PD_PRODUCT_FLAG, \
4325                  DECLARE_DIAGNOSTIC_FLAG, \
4326                  DECLARE_NOTPRODUCT_FLAG, \
4327                  IGNORE_RANGE, \
4328                  IGNORE_CONSTRAINT)
4329 
4330 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4331            DECLARE_PRODUCT_FLAG, \
4332            DECLARE_DIAGNOSTIC_FLAG, \
4333            DECLARE_EXPERIMENTAL_FLAG, \
4334            DECLARE_NOTPRODUCT_FLAG, \
4335            IGNORE_RANGE, \
4336            IGNORE_CONSTRAINT)
4337 
4338 // Extensions
4339 
4340 #include "runtime/globals_ext.hpp"
4341 
4342 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP