1 /*
   2  * Copyright (c) 1997, 2017, 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 "utilities/debug.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 #include <float.h> // for DBL_MAX
  32 
  33 // use this for flags that are true per default in the tiered build
  34 // but false in non-tiered builds, and vice versa
  35 #ifdef TIERED
  36 #define  trueInTiered true
  37 #define falseInTiered false
  38 #else
  39 #define  trueInTiered false
  40 #define falseInTiered true
  41 #endif
  42 
  43 #include CPU_HEADER(globals)
  44 #include OS_HEADER(globals)
  45 #include OS_CPU_HEADER(globals)
  46 #ifdef COMPILER1
  47 #include CPU_HEADER(c1_globals)
  48 #include OS_HEADER(c1_globals)
  49 #endif
  50 #ifdef COMPILER2
  51 #include CPU_HEADER(c2_globals)
  52 #include OS_HEADER(c2_globals)
  53 #endif
  54 #ifdef SHARK
  55 #ifdef ZERO
  56 # include "shark_globals_zero.hpp"
  57 #endif
  58 #endif
  59 
  60 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
  61 define_pd_global(bool, BackgroundCompilation,        false);
  62 define_pd_global(bool, UseTLAB,                      false);
  63 define_pd_global(bool, CICompileOSR,                 false);
  64 define_pd_global(bool, UseTypeProfile,               false);
  65 define_pd_global(bool, UseOnStackReplacement,        false);
  66 define_pd_global(bool, InlineIntrinsics,             false);
  67 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  68 define_pd_global(bool, ProfileInterpreter,           false);
  69 define_pd_global(bool, ProfileTraps,                 false);
  70 define_pd_global(bool, TieredCompilation,            false);
  71 
  72 define_pd_global(intx, CompileThreshold,             0);
  73 
  74 define_pd_global(intx, OnStackReplacePercentage,     0);
  75 define_pd_global(bool, ResizeTLAB,                   false);
  76 define_pd_global(intx, FreqInlineSize,               0);
  77 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  78 define_pd_global(intx, InlineClassNatives,           true);
  79 define_pd_global(intx, InlineUnsafeOps,              true);
  80 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  81 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  82 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
  83 define_pd_global(intx, ProfiledCodeHeapSize,         0);
  84 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
  85 
  86 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  87 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  88 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
  89 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  90 define_pd_global(bool, NeverActAsServerClassMachine, true);
  91 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
  92 #define CI_COMPILER_COUNT 0
  93 #else
  94 
  95 #if defined(COMPILER2) || INCLUDE_JVMCI
  96 #define CI_COMPILER_COUNT 2
  97 #else
  98 #define CI_COMPILER_COUNT 1
  99 #endif // COMPILER2 || INCLUDE_JVMCI
 100 
 101 #endif // no compilers
 102 
 103 // string type aliases used only in this file
 104 typedef const char* ccstr;
 105 typedef const char* ccstrlist;   // represents string arguments which accumulate
 106 
 107 // function type that will construct default range string
 108 typedef const char* (*RangeStrFunc)(void);
 109 
 110 struct Flag {
 111   enum Flags {
 112     // latest value origin
 113     DEFAULT          = 0,
 114     COMMAND_LINE     = 1,
 115     ENVIRON_VAR      = 2,
 116     CONFIG_FILE      = 3,
 117     MANAGEMENT       = 4,
 118     ERGONOMIC        = 5,
 119     ATTACH_ON_DEMAND = 6,
 120     INTERNAL         = 7,
 121 
 122     LAST_VALUE_ORIGIN = INTERNAL,
 123     VALUE_ORIGIN_BITS = 4,
 124     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 125 
 126     // flag kind
 127     KIND_PRODUCT            = 1 << 4,
 128     KIND_MANAGEABLE         = 1 << 5,
 129     KIND_DIAGNOSTIC         = 1 << 6,
 130     KIND_EXPERIMENTAL       = 1 << 7,
 131     KIND_NOT_PRODUCT        = 1 << 8,
 132     KIND_DEVELOP            = 1 << 9,
 133     KIND_PLATFORM_DEPENDENT = 1 << 10,
 134     KIND_READ_WRITE         = 1 << 11,
 135     KIND_C1                 = 1 << 12,
 136     KIND_C2                 = 1 << 13,
 137     KIND_ARCH               = 1 << 14,
 138     KIND_SHARK              = 1 << 15,
 139     KIND_LP64_PRODUCT       = 1 << 16,
 140     KIND_COMMERCIAL         = 1 << 17,
 141     KIND_JVMCI              = 1 << 18,
 142 
 143     // set this bit if the flag was set on the command line
 144     ORIG_COMMAND_LINE       = 1 << 19,
 145 
 146     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 147   };
 148 
 149   enum Error {
 150     // no error
 151     SUCCESS = 0,
 152     // flag name is missing
 153     MISSING_NAME,
 154     // flag value is missing
 155     MISSING_VALUE,
 156     // error parsing the textual form of the value
 157     WRONG_FORMAT,
 158     // flag is not writable
 159     NON_WRITABLE,
 160     // flag value is outside of its bounds
 161     OUT_OF_BOUNDS,
 162     // flag value violates its constraint
 163     VIOLATES_CONSTRAINT,
 164     // there is no flag with the given name
 165     INVALID_FLAG,
 166     // the flag can only be set only on command line during invocation of the VM
 167     COMMAND_LINE_ONLY,
 168     // the flag may only be set once
 169     SET_ONLY_ONCE,
 170     // the flag is not writable in this combination of product/debug build
 171     CONSTANT,
 172     // other, unspecified error related to setting the flag
 173     ERR_OTHER
 174   };
 175 
 176   enum MsgType {
 177     NONE = 0,
 178     DIAGNOSTIC_FLAG_BUT_LOCKED,
 179     EXPERIMENTAL_FLAG_BUT_LOCKED,
 180     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 181     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 182   };
 183 
 184   const char* _type;
 185   const char* _name;
 186   void* _addr;
 187   NOT_PRODUCT(const char* _doc;)
 188   Flags _flags;
 189 
 190   // points to all Flags static array
 191   static Flag* flags;
 192 
 193   // number of flags
 194   static size_t numFlags;
 195 
 196   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 197   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 198   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 199 
 200   static const char* get_int_default_range_str();
 201   static const char* get_uint_default_range_str();
 202   static const char* get_intx_default_range_str();
 203   static const char* get_uintx_default_range_str();
 204   static const char* get_uint64_t_default_range_str();
 205   static const char* get_size_t_default_range_str();
 206   static const char* get_double_default_range_str();
 207 
 208   Flag::Error check_writable(bool changed);
 209 
 210   bool is_bool() const;
 211   bool get_bool() const;
 212   Flag::Error set_bool(bool value);
 213 
 214   bool is_int() const;
 215   int get_int() const;
 216   Flag::Error set_int(int value);
 217 
 218   bool is_uint() const;
 219   uint get_uint() const;
 220   Flag::Error set_uint(uint value);
 221 
 222   bool is_intx() const;
 223   intx get_intx() const;
 224   Flag::Error set_intx(intx value);
 225 
 226   bool is_uintx() const;
 227   uintx get_uintx() const;
 228   Flag::Error set_uintx(uintx value);
 229 
 230   bool is_uint64_t() const;
 231   uint64_t get_uint64_t() const;
 232   Flag::Error set_uint64_t(uint64_t value);
 233 
 234   bool is_size_t() const;
 235   size_t get_size_t() const;
 236   Flag::Error set_size_t(size_t value);
 237 
 238   bool is_double() const;
 239   double get_double() const;
 240   Flag::Error set_double(double value);
 241 
 242   bool is_ccstr() const;
 243   bool ccstr_accumulates() const;
 244   ccstr get_ccstr() const;
 245   Flag::Error set_ccstr(ccstr value);
 246 
 247   Flags get_origin();
 248   void set_origin(Flags origin);
 249 
 250   bool is_default();
 251   bool is_ergonomic();
 252   bool is_command_line();
 253   void set_command_line();
 254 
 255   bool is_product() const;
 256   bool is_manageable() const;
 257   bool is_diagnostic() const;
 258   bool is_experimental() const;
 259   bool is_notproduct() const;
 260   bool is_develop() const;
 261   bool is_read_write() const;
 262   bool is_commercial() const;
 263 
 264   bool is_constant_in_binary() const;
 265 
 266   bool is_unlocker() const;
 267   bool is_unlocked() const;
 268   bool is_writeable() const;
 269   bool is_external() const;
 270 
 271   bool is_unlocker_ext() const;
 272   bool is_unlocked_ext() const;
 273   bool is_writeable_ext() const;
 274   bool is_external_ext() const;
 275 
 276   void unlock_diagnostic();
 277 
 278   Flag::MsgType get_locked_message(char*, int) const;
 279   void get_locked_message_ext(char*, int) const;
 280 
 281   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 282   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 283   void print_kind_and_origin(outputStream* st);
 284   void print_as_flag(outputStream* st);
 285 
 286   static const char* flag_error_str(Flag::Error error);
 287 };
 288 
 289 // debug flags control various aspects of the VM and are global accessible
 290 
 291 // use FlagSetting to temporarily change some debug flag
 292 // e.g. FlagSetting fs(DebugThisAndThat, true);
 293 // restored to previous value upon leaving scope
 294 class FlagSetting {
 295   bool val;
 296   bool* flag;
 297  public:
 298   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 299   ~FlagSetting()                       { *flag = val; }
 300 };
 301 
 302 
 303 class CounterSetting {
 304   intx* counter;
 305  public:
 306   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 307   ~CounterSetting()         { (*counter)--; }
 308 };
 309 
 310 class IntFlagSetting {
 311   int val;
 312   int* flag;
 313  public:
 314   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 315   ~IntFlagSetting()                     { *flag = val; }
 316 };
 317 
 318 class UIntFlagSetting {
 319   uint val;
 320   uint* flag;
 321  public:
 322   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 323   ~UIntFlagSetting()                       { *flag = val; }
 324 };
 325 
 326 class UIntXFlagSetting {
 327   uintx val;
 328   uintx* flag;
 329  public:
 330   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 331   ~UIntXFlagSetting()                         { *flag = val; }
 332 };
 333 
 334 class DoubleFlagSetting {
 335   double val;
 336   double* flag;
 337  public:
 338   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 339   ~DoubleFlagSetting()                           { *flag = val; }
 340 };
 341 
 342 class SizeTFlagSetting {
 343   size_t val;
 344   size_t* flag;
 345  public:
 346   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 347   ~SizeTFlagSetting()                           { *flag = val; }
 348 };
 349 
 350 // Helper class for temporarily saving the value of a flag during a scope.
 351 template <size_t SIZE>
 352 class FlagGuard {
 353   unsigned char _value[SIZE];
 354   void* const _addr;
 355 
 356   // Hide operator new, this class should only be allocated on the stack.
 357   // NOTE: Cannot include memory/allocation.hpp here due to circular
 358   //       dependencies.
 359   void* operator new(size_t size) throw();
 360   void* operator new [](size_t size) throw();
 361 
 362  public:
 363   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 364     memcpy(_value, _addr, SIZE);
 365   }
 366 
 367   ~FlagGuard() {
 368     memcpy(_addr, _value, SIZE);
 369   }
 370 };
 371 
 372 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 373 
 374 class CommandLineFlags {
 375 public:
 376   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 377   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); }
 378   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 379   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 380   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 381 
 382   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 383   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); }
 384   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 385   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 386   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 387 
 388   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 389   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); }
 390   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 391   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 392   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 393 
 394   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 395   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); }
 396   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 397   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 398   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 399 
 400   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 401   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); }
 402   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 403   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 404   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 405 
 406   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 407   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); }
 408   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 409   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 410   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 411 
 412   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 413   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); }
 414   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 415   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 416   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 417 
 418   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 419   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); }
 420   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 421   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 422   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 423 
 424   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 425   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); }
 426   // Contract:  Flag will make private copy of the incoming value.
 427   // Outgoing value is always malloc-ed, and caller MUST call free.
 428   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 429   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 430 
 431   // Returns false if name is not a command line flag.
 432   static bool wasSetOnCmdline(const char* name, bool* value);
 433   static void printSetFlags(outputStream* out);
 434 
 435   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 436   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 437 
 438   static void verify() PRODUCT_RETURN;
 439 };
 440 
 441 // use this for flags that are true by default in the debug version but
 442 // false in the optimized version, and vice versa
 443 #ifdef ASSERT
 444 #define trueInDebug  true
 445 #define falseInDebug false
 446 #else
 447 #define trueInDebug  false
 448 #define falseInDebug true
 449 #endif
 450 
 451 // use this for flags that are true per default in the product build
 452 // but false in development builds, and vice versa
 453 #ifdef PRODUCT
 454 #define trueInProduct  true
 455 #define falseInProduct false
 456 #else
 457 #define trueInProduct  false
 458 #define falseInProduct true
 459 #endif
 460 
 461 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 462 // product flags are always settable / visible
 463 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 464 
 465 // A flag must be declared with one of the following types:
 466 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 467 // The type "ccstr" is an alias for "const char*" and is used
 468 // only in this file, because the macrology requires single-token type names.
 469 
 470 // Note: Diagnostic options not meant for VM tuning or for product modes.
 471 // They are to be used for VM quality assurance or field diagnosis
 472 // of VM bugs.  They are hidden so that users will not be encouraged to
 473 // try them as if they were VM ordinary execution options.  However, they
 474 // are available in the product version of the VM.  Under instruction
 475 // from support engineers, VM customers can turn them on to collect
 476 // diagnostic information about VM problems.  To use a VM diagnostic
 477 // option, you must first specify +UnlockDiagnosticVMOptions.
 478 // (This master switch also affects the behavior of -Xprintflags.)
 479 //
 480 // experimental flags are in support of features that are not
 481 //    part of the officially supported product, but are available
 482 //    for experimenting with. They could, for example, be performance
 483 //    features that may not have undergone full or rigorous QA, but which may
 484 //    help performance in some cases and released for experimentation
 485 //    by the community of users and developers. This flag also allows one to
 486 //    be able to build a fully supported product that nonetheless also
 487 //    ships with some unsupported, lightly tested, experimental features.
 488 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 489 //    UnlockExperimentalVMOptions flag, which allows the control and
 490 //    modification of the experimental flags.
 491 //
 492 // Nota bene: neither diagnostic nor experimental options should be used casually,
 493 //    and they are not supported on production loads, except under explicit
 494 //    direction from support engineers.
 495 //
 496 // manageable flags are writeable external product flags.
 497 //    They are dynamically writeable through the JDK management interface
 498 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 499 //    These flags are external exported interface (see CCC).  The list of
 500 //    manageable flags can be queried programmatically through the management
 501 //    interface.
 502 //
 503 //    A flag can be made as "manageable" only if
 504 //    - the flag is defined in a CCC as an external exported interface.
 505 //    - the VM implementation supports dynamic setting of the flag.
 506 //      This implies that the VM must *always* query the flag variable
 507 //      and not reuse state related to the flag state at any given time.
 508 //    - you want the flag to be queried programmatically by the customers.
 509 //
 510 // product_rw flags are writeable internal product flags.
 511 //    They are like "manageable" flags but for internal/private use.
 512 //    The list of product_rw flags are internal/private flags which
 513 //    may be changed/removed in a future release.  It can be set
 514 //    through the management interface to get/set value
 515 //    when the name of flag is supplied.
 516 //
 517 //    A flag can be made as "product_rw" only if
 518 //    - the VM implementation supports dynamic setting of the flag.
 519 //      This implies that the VM must *always* query the flag variable
 520 //      and not reuse state related to the flag state at any given time.
 521 //
 522 // Note that when there is a need to support develop flags to be writeable,
 523 // it can be done in the same way as product_rw.
 524 //
 525 // range is a macro that will expand to min and max arguments for range
 526 //    checking code if provided - see commandLineFlagRangeList.hpp
 527 //
 528 // constraint is a macro that will expand to custom function call
 529 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 530 //
 531 // writeable is a macro that controls if and how the value can change during the runtime
 532 //
 533 // writeable(Always) is optional and allows the flag to have its value changed
 534 //    without any limitations at any time
 535 //
 536 // writeable(Once) flag value's can be only set once during the lifetime of VM
 537 //
 538 // writeable(CommandLineOnly) flag value's can be only set from command line
 539 //    (multiple times allowed)
 540 //
 541 
 542 
 543 #define RUNTIME_FLAGS(develop, \
 544                       develop_pd, \
 545                       product, \
 546                       product_pd, \
 547                       diagnostic, \
 548                       diagnostic_pd, \
 549                       experimental, \
 550                       notproduct, \
 551                       manageable, \
 552                       product_rw, \
 553                       lp64_product, \
 554                       range, \
 555                       constraint, \
 556                       writeable) \
 557                                                                             \
 558   lp64_product(bool, UseCompressedOops, false,                              \
 559           "Use 32-bit object references in 64-bit VM. "                     \
 560           "lp64_product means flag is always constant in 32 bit VM")        \
 561                                                                             \
 562   lp64_product(bool, UseCompressedClassPointers, false,                     \
 563           "Use 32-bit class pointers in 64-bit VM. "                        \
 564           "lp64_product means flag is always constant in 32 bit VM")        \
 565                                                                             \
 566   notproduct(bool, CheckCompressedOops, true,                               \
 567           "Generate checks in encoding/decoding code in debug VM")          \
 568                                                                             \
 569   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 570           "Heap allocation steps through preferred address regions to find" \
 571           " where it can allocate the heap. Number of steps to take per "   \
 572           "region.")                                                        \
 573           range(1, max_uintx)                                               \
 574                                                                             \
 575   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 576           "Default object alignment in bytes, 8 is minimum")                \
 577           range(8, 256)                                                     \
 578           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 579                                                                             \
 580   product(bool, AssumeMP, false,                                            \
 581           "Instruct the VM to assume multiple processors are available")    \
 582                                                                             \
 583   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 584   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 585   /* been re-added (see 6401008)                                         */ \
 586   product_pd(bool, UseMembar,                                               \
 587           "(Unstable) Issues membars on thread state transitions")          \
 588                                                                             \
 589   develop(bool, CleanChunkPoolAsync, true,                                  \
 590           "Clean the chunk pool asynchronously")                            \
 591                                                                             \
 592   experimental(bool, AlwaysSafeConstructors, false,                         \
 593           "Force safe construction, as if all fields are final.")           \
 594                                                                             \
 595   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 596           "Enable normal processing of flags relating to field diagnostics")\
 597                                                                             \
 598   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 599           "Enable normal processing of flags relating to experimental "     \
 600           "features")                                                       \
 601                                                                             \
 602   product(bool, JavaMonitorsInStackTrace, true,                             \
 603           "Print information about Java monitor locks when the stacks are"  \
 604           "dumped")                                                         \
 605                                                                             \
 606   product_pd(bool, UseLargePages,                                           \
 607           "Use large page memory")                                          \
 608                                                                             \
 609   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 610           "Allocate large pages individually for better affinity")          \
 611                                                                             \
 612   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 613           "Fail large pages individual allocation")                         \
 614                                                                             \
 615   product(bool, UseLargePagesInMetaspace, false,                            \
 616           "Use large page memory in metaspace. "                            \
 617           "Only used if UseLargePages is enabled.")                         \
 618                                                                             \
 619   product(bool, UseNUMA, false,                                             \
 620           "Use NUMA if available")                                          \
 621                                                                             \
 622   product(bool, UseNUMAInterleaving, false,                                 \
 623           "Interleave memory across NUMA nodes if available")               \
 624                                                                             \
 625   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 626           "Granularity to use for NUMA interleaving on Windows OS")         \
 627           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 628                                                                             \
 629   product(bool, ForceNUMA, false,                                           \
 630           "Force NUMA optimizations on single-node/UMA systems")            \
 631                                                                             \
 632   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 633           "Percentage (0-100) used to weight the current sample when "      \
 634           "computing exponentially decaying average for "                   \
 635           "AdaptiveNUMAChunkSizing")                                        \
 636           range(0, 100)                                                     \
 637                                                                             \
 638   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 639           "Do not reallocate more than this amount per collection")         \
 640           range(0, max_uintx)                                               \
 641                                                                             \
 642   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 643           "Enable adaptive chunk sizing for NUMA")                          \
 644                                                                             \
 645   product(bool, NUMAStats, false,                                           \
 646           "Print NUMA stats in detailed heap information")                  \
 647                                                                             \
 648   product(uintx, NUMAPageScanRate, 256,                                     \
 649           "Maximum number of pages to include in the page scan procedure")  \
 650           range(0, max_uintx)                                               \
 651                                                                             \
 652   product_pd(bool, NeedsDeoptSuspend,                                       \
 653           "True for register window machines (sparc/ia64)")                 \
 654                                                                             \
 655   product(intx, UseSSE, 99,                                                 \
 656           "Highest supported SSE instructions set on x86/x64")              \
 657           range(0, 99)                                                      \
 658                                                                             \
 659   product(bool, UseAES, false,                                              \
 660           "Control whether AES instructions can be used on x86/x64")        \
 661                                                                             \
 662   product(bool, UseFMA, false,                                              \
 663           "Control whether FMA instructions can be used")                   \
 664                                                                             \
 665   product(bool, UseSHA, false,                                              \
 666           "Control whether SHA instructions can be used "                   \
 667           "on SPARC, on ARM and on x86")                                    \
 668                                                                             \
 669   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 670           "Use intrinsics for GHASH versions of crypto")                    \
 671                                                                             \
 672   product(size_t, LargePageSizeInBytes, 0,                                  \
 673           "Large page size (0 to let VM choose the page size)")             \
 674           range(0, max_uintx)                                               \
 675                                                                             \
 676   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 677           "Use large pages if maximum heap is at least this big")           \
 678           range(0, max_uintx)                                               \
 679                                                                             \
 680   product(bool, ForceTimeHighResolution, false,                             \
 681           "Using high time resolution (for Win32 only)")                    \
 682                                                                             \
 683   develop(bool, TracePcPatching, false,                                     \
 684           "Trace usage of frame::patch_pc")                                 \
 685                                                                             \
 686   develop(bool, TraceRelocator, false,                                      \
 687           "Trace the bytecode relocator")                                   \
 688                                                                             \
 689   develop(bool, TraceLongCompiles, false,                                   \
 690           "Print out every time compilation is longer than "                \
 691           "a given threshold")                                              \
 692                                                                             \
 693   develop(bool, SafepointALot, false,                                       \
 694           "Generate a lot of safepoints. This works with "                  \
 695           "GuaranteedSafepointInterval")                                    \
 696                                                                             \
 697   product_pd(bool, BackgroundCompilation,                                   \
 698           "A thread requesting compilation is not blocked during "          \
 699           "compilation")                                                    \
 700                                                                             \
 701   product(bool, PrintVMQWaitTime, false,                                    \
 702           "Print out the waiting time in VM operation queue")               \
 703                                                                             \
 704   develop(bool, TraceOopMapGeneration, false,                               \
 705           "Show OopMapGeneration")                                          \
 706                                                                             \
 707   product(bool, MethodFlushing, true,                                       \
 708           "Reclamation of zombie and not-entrant methods")                  \
 709                                                                             \
 710   develop(bool, VerifyStack, false,                                         \
 711           "Verify stack of each thread when it is entering a runtime call") \
 712                                                                             \
 713   diagnostic(bool, ForceUnreachable, false,                                 \
 714           "Make all non code cache addresses to be unreachable by "         \
 715           "forcing use of 64bit literal fixups")                            \
 716                                                                             \
 717   notproduct(bool, StressDerivedPointers, false,                            \
 718           "Force scavenge when a derived pointer is detected on stack "     \
 719           "after rtm call")                                                 \
 720                                                                             \
 721   develop(bool, TraceDerivedPointers, false,                                \
 722           "Trace traversal of derived pointers on stack")                   \
 723                                                                             \
 724   notproduct(bool, TraceCodeBlobStacks, false,                              \
 725           "Trace stack-walk of codeblobs")                                  \
 726                                                                             \
 727   product(bool, PrintJNIResolving, false,                                   \
 728           "Used to implement -v:jni")                                       \
 729                                                                             \
 730   notproduct(bool, PrintRewrites, false,                                    \
 731           "Print methods that are being rewritten")                         \
 732                                                                             \
 733   product(bool, UseInlineCaches, true,                                      \
 734           "Use Inline Caches for virtual calls ")                           \
 735                                                                             \
 736   diagnostic(bool, InlineArrayCopy, true,                                   \
 737           "Inline arraycopy native that is known to be part of "            \
 738           "base library DLL")                                               \
 739                                                                             \
 740   diagnostic(bool, InlineObjectHash, true,                                  \
 741           "Inline Object::hashCode() native that is known to be part "      \
 742           "of base library DLL")                                            \
 743                                                                             \
 744   diagnostic(bool, InlineNatives, true,                                     \
 745           "Inline natives that are known to be part of base library DLL")   \
 746                                                                             \
 747   diagnostic(bool, InlineMathNatives, true,                                 \
 748           "Inline SinD, CosD, etc.")                                        \
 749                                                                             \
 750   diagnostic(bool, InlineClassNatives, true,                                \
 751           "Inline Class.isInstance, etc")                                   \
 752                                                                             \
 753   diagnostic(bool, InlineThreadNatives, true,                               \
 754           "Inline Thread.currentThread, etc")                               \
 755                                                                             \
 756   diagnostic(bool, InlineUnsafeOps, true,                                   \
 757           "Inline memory ops (native methods) from Unsafe")                 \
 758                                                                             \
 759   product(bool, CriticalJNINatives, true,                                   \
 760           "Check for critical JNI entry points")                            \
 761                                                                             \
 762   notproduct(bool, StressCriticalJNINatives, false,                         \
 763           "Exercise register saving code in critical natives")              \
 764                                                                             \
 765   diagnostic(bool, UseAESIntrinsics, false,                                 \
 766           "Use intrinsics for AES versions of crypto")                      \
 767                                                                             \
 768   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 769           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 770                                                                             \
 771   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 772           "Use intrinsics for SHA-1 crypto hash function. "                 \
 773           "Requires that UseSHA is enabled.")                               \
 774                                                                             \
 775   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 776           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 777           "Requires that UseSHA is enabled.")                               \
 778                                                                             \
 779   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 780           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 781           "Requires that UseSHA is enabled.")                               \
 782                                                                             \
 783   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 784           "use intrinsics for java.util.zip.CRC32")                         \
 785                                                                             \
 786   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 787           "use intrinsics for java.util.zip.CRC32C")                        \
 788                                                                             \
 789   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 790           "use intrinsics for java.util.zip.Adler32")                       \
 791                                                                             \
 792   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 793           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 794                                                                             \
 795   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 796          "do not expand intrinsics whose (internal) names appear here")     \
 797                                                                             \
 798   develop(bool, TraceCallFixup, false,                                      \
 799           "Trace all call fixups")                                          \
 800                                                                             \
 801   develop(bool, DeoptimizeALot, false,                                      \
 802           "Deoptimize at every exit from the runtime system")               \
 803                                                                             \
 804   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 805           "A comma separated list of bcis to deoptimize at")                \
 806                                                                             \
 807   product(bool, DeoptimizeRandom, false,                                    \
 808           "Deoptimize random frames on random exit from the runtime system")\
 809                                                                             \
 810   notproduct(bool, ZombieALot, false,                                       \
 811           "Create zombies (non-entrant) at exit from the runtime system")   \
 812                                                                             \
 813   product(bool, UnlinkSymbolsALot, false,                                   \
 814           "Unlink unreferenced symbols from the symbol table at safepoints")\
 815                                                                             \
 816   notproduct(bool, WalkStackALot, false,                                    \
 817           "Trace stack (no print) at every exit from the runtime system")   \
 818                                                                             \
 819   product(bool, Debugging, false,                                           \
 820           "Set when executing debug methods in debug.cpp "                  \
 821           "(to prevent triggering assertions)")                             \
 822                                                                             \
 823   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 824           "Enable strict checks that safepoints cannot happen for threads " \
 825           "that use NoSafepointVerifier")                                   \
 826                                                                             \
 827   notproduct(bool, VerifyLastFrame, false,                                  \
 828           "Verify oops on last frame on entry to VM")                       \
 829                                                                             \
 830   product(bool, FailOverToOldVerifier, true,                                \
 831           "Fail over to old verifier when split verifier fails")            \
 832                                                                             \
 833   develop(bool, ShowSafepointMsgs, false,                                   \
 834           "Show message about safepoint synchronization")                   \
 835                                                                             \
 836   product(bool, SafepointTimeout, false,                                    \
 837           "Time out and warn or fail after SafepointTimeoutDelay "          \
 838           "milliseconds if failed to reach safepoint")                      \
 839                                                                             \
 840   develop(bool, DieOnSafepointTimeout, false,                               \
 841           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 842                                                                             \
 843   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 844   /* typically, at most a few retries are needed                    */      \
 845   product(intx, SuspendRetryCount, 50,                                      \
 846           "Maximum retry count for an external suspend request")            \
 847           range(0, max_intx)                                                \
 848                                                                             \
 849   product(intx, SuspendRetryDelay, 5,                                       \
 850           "Milliseconds to delay per retry (* current_retry_count)")        \
 851           range(0, max_intx)                                                \
 852                                                                             \
 853   product(bool, AssertOnSuspendWaitFailure, false,                          \
 854           "Assert/Guarantee on external suspend wait failure")              \
 855                                                                             \
 856   product(bool, TraceSuspendWaitFailures, false,                            \
 857           "Trace external suspend wait failures")                           \
 858                                                                             \
 859   product(bool, MaxFDLimit, true,                                           \
 860           "Bump the number of file descriptors to maximum in Solaris")      \
 861                                                                             \
 862   diagnostic(bool, LogEvents, true,                                         \
 863           "Enable the various ring buffer event logs")                      \
 864                                                                             \
 865   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 866           "Number of ring buffer event logs")                               \
 867           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 868                                                                             \
 869   product(bool, BytecodeVerificationRemote, true,                           \
 870           "Enable the Java bytecode verifier for remote classes")           \
 871                                                                             \
 872   product(bool, BytecodeVerificationLocal, false,                           \
 873           "Enable the Java bytecode verifier for local classes")            \
 874                                                                             \
 875   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 876           "Force exceptions on FP stack under/overflow")                    \
 877                                                                             \
 878   develop(bool, VerifyStackAtCalls, false,                                  \
 879           "Verify that the stack pointer is unchanged after calls")         \
 880                                                                             \
 881   develop(bool, TraceJavaAssertions, false,                                 \
 882           "Trace java language assertions")                                 \
 883                                                                             \
 884   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 885           "Temporary - see javaClasses.cpp")                                \
 886                                                                             \
 887   notproduct(bool, PrintMallocFree, false,                                  \
 888           "Trace calls to C heap malloc/free allocation")                   \
 889                                                                             \
 890   notproduct(bool, VerifyCodeCache, false,                                  \
 891           "Verify code cache on memory allocation/deallocation")            \
 892                                                                             \
 893   develop(bool, UseMallocOnly, false,                                       \
 894           "Use only malloc/free for allocation (no resource area/arena)")   \
 895                                                                             \
 896   develop(bool, PrintMalloc, false,                                         \
 897           "Print all malloc/free calls")                                    \
 898                                                                             \
 899   develop(bool, PrintMallocStatistics, false,                               \
 900           "Print malloc/free statistics")                                   \
 901                                                                             \
 902   develop(bool, ZapResourceArea, trueInDebug,                               \
 903           "Zap freed resource/arena space with 0xABABABAB")                 \
 904                                                                             \
 905   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 906           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 907                                                                             \
 908   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 909           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 910                                                                             \
 911   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 912           "Zap allocated/freed stack segments with 0xFADFADED")             \
 913                                                                             \
 914   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 915           "Zap unused heap space with 0xBAADBABE")                          \
 916                                                                             \
 917   develop(bool, CheckZapUnusedHeapArea, false,                              \
 918           "Check zapping of unused heap space")                             \
 919                                                                             \
 920   develop(bool, ZapFillerObjects, trueInDebug,                              \
 921           "Zap filler objects with 0xDEAFBABE")                             \
 922                                                                             \
 923   develop(bool, PrintVMMessages, true,                                      \
 924           "Print VM messages on console")                                   \
 925                                                                             \
 926   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 927           "If > 0, provokes an error after VM initialization; the value "   \
 928           "determines which error to provoke. See test_error_handler() "    \
 929           "in debug.cpp.")                                                  \
 930                                                                             \
 931   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 932           "If > 0, provokes an error inside VM error handler (a secondary " \
 933           "crash). see test_error_handler() in debug.cpp.")                 \
 934                                                                             \
 935   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 936           "If true, tests SafeFetch inside error handler.")                 \
 937                                                                             \
 938   develop(bool, Verbose, false,                                             \
 939           "Print additional debugging information from other modes")        \
 940                                                                             \
 941   develop(bool, PrintMiscellaneous, false,                                  \
 942           "Print uncategorized debugging information (requires +Verbose)")  \
 943                                                                             \
 944   develop(bool, WizardMode, false,                                          \
 945           "Print much more debugging information")                          \
 946                                                                             \
 947   product(bool, ShowMessageBoxOnError, false,                               \
 948           "Keep process alive on VM fatal error")                           \
 949                                                                             \
 950   product(bool, CreateCoredumpOnCrash, true,                                \
 951           "Create core/mini dump on VM fatal error")                        \
 952                                                                             \
 953   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 954           "Timeout, in seconds, to limit the time spent on writing an "     \
 955           "error log in case of a crash.")                                  \
 956           range(0, (uint64_t)max_jlong/1000)                                \
 957                                                                             \
 958   product_pd(bool, UseOSErrorReporting,                                     \
 959           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 960                                                                             \
 961   product(bool, SuppressFatalErrorMessage, false,                           \
 962           "Report NO fatal error message (avoid deadlock)")                 \
 963                                                                             \
 964   product(ccstrlist, OnError, "",                                           \
 965           "Run user-defined commands on fatal error; see VMError.cpp "      \
 966           "for examples")                                                   \
 967                                                                             \
 968   product(ccstrlist, OnOutOfMemoryError, "",                                \
 969           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 970                                                                             \
 971   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 972           "Dump heap to file before any major stop-the-world GC")           \
 973                                                                             \
 974   manageable(bool, HeapDumpAfterFullGC, false,                              \
 975           "Dump heap to file after any major stop-the-world GC")            \
 976                                                                             \
 977   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 978           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 979                                                                             \
 980   manageable(ccstr, HeapDumpPath, NULL,                                     \
 981           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 982           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 983           "in the working directory)")                                      \
 984                                                                             \
 985   develop(bool, BreakAtWarning, false,                                      \
 986           "Execute breakpoint upon encountering VM warning")                \
 987                                                                             \
 988   develop(bool, UseFakeTimers, false,                                       \
 989           "Tell whether the VM should use system time or a fake timer")     \
 990                                                                             \
 991   product(ccstr, NativeMemoryTracking, "off",                               \
 992           "Native memory tracking options")                                 \
 993                                                                             \
 994   diagnostic(bool, PrintNMTStatistics, false,                               \
 995           "Print native memory tracking summary data if it is on")          \
 996                                                                             \
 997   diagnostic(bool, LogCompilation, false,                                   \
 998           "Log compilation activity in detail to LogFile")                  \
 999                                                                             \
1000   product(bool, PrintCompilation, false,                                    \
1001           "Print compilations")                                             \
1002                                                                             \
1003   diagnostic(bool, TraceNMethodInstalls, false,                             \
1004           "Trace nmethod installation")                                     \
1005                                                                             \
1006   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1007           "0: do not allow scavengable oops in the code cache; "            \
1008           "1: allow scavenging from the code cache; "                       \
1009           "2: emit as many constants as the compiler can see")              \
1010           range(0, 2)                                                       \
1011                                                                             \
1012   product(bool, AlwaysRestoreFPU, false,                                    \
1013           "Restore the FPU control word after every JNI call (expensive)")  \
1014                                                                             \
1015   diagnostic(bool, PrintCompilation2, false,                                \
1016           "Print additional statistics per compilation")                    \
1017                                                                             \
1018   diagnostic(bool, PrintAdapterHandlers, false,                             \
1019           "Print code generated for i2c/c2i adapters")                      \
1020                                                                             \
1021   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1022           "Verify that i2c/c2i adapters are called properly")               \
1023                                                                             \
1024   develop(bool, VerifyAdapterSharing, false,                                \
1025           "Verify that the code for shared adapters is the equivalent")     \
1026                                                                             \
1027   diagnostic(bool, PrintAssembly, false,                                    \
1028           "Print assembly code (using external disassembler.so)")           \
1029                                                                             \
1030   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1031           "Print options string passed to disassembler.so")                 \
1032                                                                             \
1033   notproduct(bool, PrintNMethodStatistics, false,                           \
1034           "Print a summary statistic for the generated nmethods")           \
1035                                                                             \
1036   diagnostic(bool, PrintNMethods, false,                                    \
1037           "Print assembly code for nmethods when generated")                \
1038                                                                             \
1039   diagnostic(bool, PrintNativeNMethods, false,                              \
1040           "Print assembly code for native nmethods when generated")         \
1041                                                                             \
1042   develop(bool, PrintDebugInfo, false,                                      \
1043           "Print debug information for all nmethods when generated")        \
1044                                                                             \
1045   develop(bool, PrintRelocations, false,                                    \
1046           "Print relocation information for all nmethods when generated")   \
1047                                                                             \
1048   develop(bool, PrintDependencies, false,                                   \
1049           "Print dependency information for all nmethods when generated")   \
1050                                                                             \
1051   develop(bool, PrintExceptionHandlers, false,                              \
1052           "Print exception handler tables for all nmethods when generated") \
1053                                                                             \
1054   develop(bool, StressCompiledExceptionHandlers, false,                     \
1055           "Exercise compiled exception handlers")                           \
1056                                                                             \
1057   develop(bool, InterceptOSException, false,                                \
1058           "Start debugger when an implicit OS (e.g. NULL) "                 \
1059           "exception happens")                                              \
1060                                                                             \
1061   product(bool, PrintCodeCache, false,                                      \
1062           "Print the code cache memory usage when exiting")                 \
1063                                                                             \
1064   develop(bool, PrintCodeCache2, false,                                     \
1065           "Print detailed usage information on the code cache when exiting")\
1066                                                                             \
1067   product(bool, PrintCodeCacheOnCompilation, false,                         \
1068           "Print the code cache memory usage each time a method is "        \
1069           "compiled")                                                       \
1070                                                                             \
1071   diagnostic(bool, PrintStubCode, false,                                    \
1072           "Print generated stub code")                                      \
1073                                                                             \
1074   product(bool, StackTraceInThrowable, true,                                \
1075           "Collect backtrace in throwable when exception happens")          \
1076                                                                             \
1077   product(bool, OmitStackTraceInFastThrow, true,                            \
1078           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1079                                                                             \
1080   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1081           "Print bytecode statistics when dumping profiler output")         \
1082                                                                             \
1083   product(bool, ProfilerRecordPC, false,                                    \
1084           "Collect ticks for each 16 byte interval of compiled code")       \
1085                                                                             \
1086   product(bool, ProfileVM, false,                                           \
1087           "Profile ticks that fall within VM (either in the VM Thread "     \
1088           "or VM code called through stubs)")                               \
1089                                                                             \
1090   product(bool, ProfileIntervals, false,                                    \
1091           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1092                                                                             \
1093   notproduct(bool, ProfilerCheckIntervals, false,                           \
1094           "Collect and print information on spacing of profiler ticks")     \
1095                                                                             \
1096   product(bool, PrintWarnings, true,                                        \
1097           "Print JVM warnings to output stream")                            \
1098                                                                             \
1099   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1100           "Print warnings for stalled SpinLocks")                           \
1101                                                                             \
1102   product(bool, RegisterFinalizersAtInit, true,                             \
1103           "Register finalizable objects at end of Object.<init> or "        \
1104           "after allocation")                                               \
1105                                                                             \
1106   develop(bool, RegisterReferences, true,                                   \
1107           "Tell whether the VM should register soft/weak/final/phantom "    \
1108           "references")                                                     \
1109                                                                             \
1110   develop(bool, IgnoreRewrites, false,                                      \
1111           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1112           "This is unsafe!")                                                \
1113                                                                             \
1114   develop(bool, PrintCodeCacheExtension, false,                             \
1115           "Print extension of code cache")                                  \
1116                                                                             \
1117   develop(bool, UsePrivilegedStack, true,                                   \
1118           "Enable the security JVM functions")                              \
1119                                                                             \
1120   develop(bool, ProtectionDomainVerification, true,                         \
1121           "Verify protection domain before resolution in system dictionary")\
1122                                                                             \
1123   product(bool, ClassUnloading, true,                                       \
1124           "Do unloading of classes")                                        \
1125                                                                             \
1126   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1127           "Do unloading of classes with a concurrent marking cycle")        \
1128                                                                             \
1129   develop(bool, DisableStartThread, false,                                  \
1130           "Disable starting of additional Java threads "                    \
1131           "(for debugging only)")                                           \
1132                                                                             \
1133   develop(bool, MemProfiling, false,                                        \
1134           "Write memory usage profiling to log file")                       \
1135                                                                             \
1136   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1137           "Print the system dictionary at exit")                            \
1138                                                                             \
1139   experimental(intx, PredictedLoadedClassCount, 0,                          \
1140           "Experimental: Tune loaded class cache starting size")            \
1141                                                                             \
1142   diagnostic(bool, UnsyncloadClass, false,                                  \
1143           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1144           "class loader must call VM synchronized for findClass "           \
1145           "and defineClass.")                                               \
1146                                                                             \
1147   product(bool, AlwaysLockClassLoader, false,                               \
1148           "Require the VM to acquire the class loader lock before calling " \
1149           "loadClass() even for class loaders registering "                 \
1150           "as parallel capable")                                            \
1151                                                                             \
1152   product(bool, AllowParallelDefineClass, false,                            \
1153           "Allow parallel defineClass requests for class loaders "          \
1154           "registering as parallel capable")                                \
1155                                                                             \
1156   product(bool, MustCallLoadClassInternal, false,                           \
1157           "Call loadClassInternal() rather than loadClass()")               \
1158                                                                             \
1159   product_pd(bool, DontYieldALot,                                           \
1160           "Throw away obvious excess yield calls")                          \
1161                                                                             \
1162   develop(bool, UseDetachedThreads, true,                                   \
1163           "Use detached threads that are recycled upon termination "        \
1164           "(for Solaris only)")                                             \
1165                                                                             \
1166   product(bool, UseLWPSynchronization, true,                                \
1167           "Use LWP-based instead of libthread-based synchronization "       \
1168           "(SPARC only)")                                                   \
1169                                                                             \
1170   experimental(ccstr, SyncKnobs, NULL,                                      \
1171                "(Unstable) Various monitor synchronization tunables")       \
1172                                                                             \
1173   experimental(intx, EmitSync, 0,                                           \
1174                "(Unsafe, Unstable) "                                        \
1175                "Control emission of inline sync fast-path code")            \
1176                                                                             \
1177   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1178           range(0, max_jint)                                                \
1179                                                                             \
1180   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1181                                                                             \
1182   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1183                "Experimental Sync flags")                                   \
1184                                                                             \
1185   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1186                                                                             \
1187   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1188                                                                             \
1189   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1190                                                                             \
1191   experimental(intx, hashCode, 5,                                           \
1192                "(Unstable) select hashCode generation algorithm")           \
1193                                                                             \
1194   product(bool, FilterSpuriousWakeups, true,                                \
1195           "When true prevents OS-level spurious, or premature, wakeups "    \
1196           "from Object.wait (Ignored for Windows)")                         \
1197                                                                             \
1198   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1199                                                                             \
1200   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1201                                                                             \
1202   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1203                                                                             \
1204   develop(bool, UsePthreads, false,                                         \
1205           "Use pthread-based instead of libthread-based synchronization "   \
1206           "(SPARC only)")                                                   \
1207                                                                             \
1208   product(bool, ReduceSignalUsage, false,                                   \
1209           "Reduce the use of OS signals in Java and/or the VM")             \
1210                                                                             \
1211   develop_pd(bool, ShareVtableStubs,                                        \
1212           "Share vtable stubs (smaller code but worse branch prediction")   \
1213                                                                             \
1214   develop(bool, LoadLineNumberTables, true,                                 \
1215           "Tell whether the class file parser loads line number tables")    \
1216                                                                             \
1217   develop(bool, LoadLocalVariableTables, true,                              \
1218           "Tell whether the class file parser loads local variable tables") \
1219                                                                             \
1220   develop(bool, LoadLocalVariableTypeTables, true,                          \
1221           "Tell whether the class file parser loads local variable type"    \
1222           "tables")                                                         \
1223                                                                             \
1224   product(bool, AllowUserSignalHandlers, false,                             \
1225           "Do not complain if the application installs signal handlers "    \
1226           "(Solaris & Linux only)")                                         \
1227                                                                             \
1228   product(bool, UseSignalChaining, true,                                    \
1229           "Use signal-chaining to invoke signal handlers installed "        \
1230           "by the application (Solaris & Linux only)")                      \
1231                                                                             \
1232   product(bool, AllowJNIEnvProxy, false,                                    \
1233           "Allow JNIEnv proxies for jdbx")                                  \
1234                                                                             \
1235   product(bool, RestoreMXCSROnJNICalls, false,                              \
1236           "Restore MXCSR when returning from JNI calls")                    \
1237                                                                             \
1238   product(bool, CheckJNICalls, false,                                       \
1239           "Verify all arguments to JNI calls")                              \
1240                                                                             \
1241   product(bool, CheckEndorsedAndExtDirs, false,                             \
1242           "Verify the endorsed and extension directories are not used")     \
1243                                                                             \
1244   product(bool, UseFastJNIAccessors, true,                                  \
1245           "Use optimized versions of Get<Primitive>Field")                  \
1246                                                                             \
1247   product(intx, MaxJNILocalCapacity, 65536,                                 \
1248           "Maximum allowable local JNI handle capacity to "                 \
1249           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1250           "where <= 0 is unlimited, default: 65536")                        \
1251           range(min_intx, max_intx)                                         \
1252                                                                             \
1253   product(bool, EagerXrunInit, false,                                       \
1254           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1255           "but not all -Xrun libraries may support the state of the VM "    \
1256           "at this time")                                                   \
1257                                                                             \
1258   product(bool, PreserveAllAnnotations, false,                              \
1259           "Preserve RuntimeInvisibleAnnotations as well "                   \
1260           "as RuntimeVisibleAnnotations")                                   \
1261                                                                             \
1262   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1263           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1264                                                                             \
1265   product(bool, UseXMMForArrayCopy, false,                                  \
1266           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1267                                                                             \
1268   product(intx, FieldsAllocationStyle, 1,                                   \
1269           "0 - type based with oops first, "                                \
1270           "1 - with oops last, "                                            \
1271           "2 - oops in super and sub classes are together")                 \
1272           range(0, 2)                                                       \
1273                                                                             \
1274   product(bool, CompactFields, true,                                        \
1275           "Allocate nonstatic fields in gaps between previous fields")      \
1276                                                                             \
1277   notproduct(bool, PrintFieldLayout, false,                                 \
1278           "Print field layout for each class")                              \
1279                                                                             \
1280   /* Need to limit the extent of the padding to reasonable size.          */\
1281   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1282   /* aggressive prefetching, while still leaving the room for segregating */\
1283   /* among the distinct pages.                                            */\
1284   product(intx, ContendedPaddingWidth, 128,                                 \
1285           "How many bytes to pad the fields/classes marked @Contended with")\
1286           range(0, 8192)                                                    \
1287           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1288                                                                             \
1289   product(bool, EnableContended, true,                                      \
1290           "Enable @Contended annotation support")                           \
1291                                                                             \
1292   product(bool, RestrictContended, true,                                    \
1293           "Restrict @Contended to trusted classes")                         \
1294                                                                             \
1295   product(bool, UseBiasedLocking, true,                                     \
1296           "Enable biased locking in JVM")                                   \
1297                                                                             \
1298   product(intx, BiasedLockingStartupDelay, 4000,                            \
1299           "Number of milliseconds to wait before enabling biased locking")  \
1300           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1301           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1302                                                                             \
1303   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1304           "Print statistics of biased locking in JVM")                      \
1305                                                                             \
1306   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1307           "Threshold of number of revocations per type to try to "          \
1308           "rebias all objects in the heap of that type")                    \
1309           range(0, max_intx)                                                \
1310           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1311                                                                             \
1312   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1313           "Threshold of number of revocations per type to permanently "     \
1314           "revoke biases of all objects in the heap of that type")          \
1315           range(0, max_intx)                                                \
1316           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1317                                                                             \
1318   product(intx, BiasedLockingDecayTime, 25000,                              \
1319           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1320           "type after previous bulk rebias")                                \
1321           range(500, max_intx)                                              \
1322           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1323                                                                             \
1324   product(bool, ExitOnOutOfMemoryError, false,                              \
1325           "JVM exits on the first occurrence of an out-of-memory error")    \
1326                                                                             \
1327   product(bool, CrashOnOutOfMemoryError, false,                             \
1328           "JVM aborts, producing an error log and core/mini dump, on the "  \
1329           "first occurrence of an out-of-memory error")                     \
1330                                                                             \
1331   /* tracing */                                                             \
1332                                                                             \
1333   develop(bool, StressRewriter, false,                                      \
1334           "Stress linktime bytecode rewriting")                             \
1335                                                                             \
1336   product(ccstr, TraceJVMTI, NULL,                                          \
1337           "Trace flags for JVMTI functions and events")                     \
1338                                                                             \
1339   /* This option can change an EMCP method into an obsolete method. */      \
1340   /* This can affect tests that except specific methods to be EMCP. */      \
1341   /* This option should be used with caution.                       */      \
1342   product(bool, StressLdcRewrite, false,                                    \
1343           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1344                                                                             \
1345   /* change to false by default sometime after Mustang */                   \
1346   product(bool, VerifyMergedCPBytecodes, true,                              \
1347           "Verify bytecodes after RedefineClasses constant pool merging")   \
1348                                                                             \
1349   develop(bool, TraceBytecodes, false,                                      \
1350           "Trace bytecode execution")                                       \
1351                                                                             \
1352   develop(bool, TraceICs, false,                                            \
1353           "Trace inline cache changes")                                     \
1354                                                                             \
1355   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1356           "Trace method invocation counter overflow")                       \
1357                                                                             \
1358   develop(bool, TraceInlineCacheClearing, false,                            \
1359           "Trace clearing of inline caches in nmethods")                    \
1360                                                                             \
1361   develop(bool, TraceDependencies, false,                                   \
1362           "Trace dependencies")                                             \
1363                                                                             \
1364   develop(bool, VerifyDependencies, trueInDebug,                            \
1365           "Exercise and verify the compilation dependency mechanism")       \
1366                                                                             \
1367   develop(bool, TraceNewOopMapGeneration, false,                            \
1368           "Trace OopMapGeneration")                                         \
1369                                                                             \
1370   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1371           "Trace OopMapGeneration: print detailed cell states")             \
1372                                                                             \
1373   develop(bool, TimeOopMap, false,                                          \
1374           "Time calls to GenerateOopMap::compute_map() in sum")             \
1375                                                                             \
1376   develop(bool, TimeOopMap2, false,                                         \
1377           "Time calls to GenerateOopMap::compute_map() individually")       \
1378                                                                             \
1379   develop(bool, TraceOopMapRewrites, false,                                 \
1380           "Trace rewriting of method oops during oop map generation")       \
1381                                                                             \
1382   develop(bool, TraceICBuffer, false,                                       \
1383           "Trace usage of IC buffer")                                       \
1384                                                                             \
1385   develop(bool, TraceCompiledIC, false,                                     \
1386           "Trace changes of compiled IC")                                   \
1387                                                                             \
1388   /* gc */                                                                  \
1389                                                                             \
1390   product(bool, UseSerialGC, false,                                         \
1391           "Use the Serial garbage collector")                               \
1392                                                                             \
1393   product(bool, UseG1GC, false,                                             \
1394           "Use the Garbage-First garbage collector")                        \
1395                                                                             \
1396   product(bool, UseParallelGC, false,                                       \
1397           "Use the Parallel Scavenge garbage collector")                    \
1398                                                                             \
1399   product(bool, UseParallelOldGC, false,                                    \
1400           "Use the Parallel Old garbage collector")                         \
1401                                                                             \
1402   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1403           "How often should we maximally compact the heap (not allowing "   \
1404           "any dead space)")                                                \
1405           range(0, max_uintx)                                               \
1406                                                                             \
1407   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1408           "The collection count for the first maximum compaction")          \
1409           range(0, max_uintx)                                               \
1410                                                                             \
1411   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1412           "Use maximum compaction in the Parallel Old garbage collector "   \
1413           "for a system GC")                                                \
1414                                                                             \
1415   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1416           "The mean used by the parallel compact dead wood "                \
1417           "limiter (a number between 0-100)")                               \
1418           range(0, 100)                                                     \
1419                                                                             \
1420   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1421           "The standard deviation used by the parallel compact dead wood "  \
1422           "limiter (a number between 0-100)")                               \
1423           range(0, 100)                                                     \
1424                                                                             \
1425   product(uint, ParallelGCThreads, 0,                                       \
1426           "Number of parallel threads parallel gc will use")                \
1427           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1428                                                                             \
1429   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1430             "Use semaphore synchronization for the GC Threads, "            \
1431             "instead of synchronization based on mutexes")                  \
1432                                                                             \
1433   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1434           "Dynamically choose the number of parallel threads "              \
1435           "parallel gc will use")                                           \
1436                                                                             \
1437   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1438              "Inject thread creation failures for "                         \
1439              "UseDynamicNumberOfGCThreads")                                 \
1440                                                                             \
1441   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1442           "Force dynamic selection of the number of "                       \
1443           "parallel threads parallel gc will use to aid debugging")         \
1444                                                                             \
1445   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1446           "Size of heap (bytes) per GC thread used in calculating the "     \
1447           "number of GC threads")                                           \
1448           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1449                                                                             \
1450   product(uint, ConcGCThreads, 0,                                           \
1451           "Number of threads concurrent gc will use")                       \
1452           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1453                                                                             \
1454   product(uintx, GCTaskTimeStampEntries, 200,                               \
1455           "Number of time stamp entries per gc worker thread")              \
1456           range(1, max_uintx)                                               \
1457                                                                             \
1458   product(bool, AlwaysTenure, false,                                        \
1459           "Always tenure objects in eden (ParallelGC only)")                \
1460                                                                             \
1461   product(bool, NeverTenure, false,                                         \
1462           "Never tenure objects in eden, may tenure on overflow "           \
1463           "(ParallelGC only)")                                              \
1464                                                                             \
1465   product(bool, ScavengeBeforeFullGC, true,                                 \
1466           "Scavenge youngest generation before each full GC.")              \
1467                                                                             \
1468   product(bool, UseConcMarkSweepGC, false,                                  \
1469           "Use Concurrent Mark-Sweep GC in the old generation")             \
1470                                                                             \
1471   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1472           "A System.gc() request invokes a concurrent collection; "         \
1473           "(effective only when using concurrent collectors)")              \
1474                                                                             \
1475   product(bool, GCLockerInvokesConcurrent, false,                           \
1476           "The exit of a JNI critical section necessitating a scavenge, "   \
1477           "also kicks off a background concurrent collection")              \
1478                                                                             \
1479   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1480           "How much the GC can expand the eden by while the GC locker "     \
1481           "is active (as a percentage)")                                    \
1482           range(0, 100)                                                     \
1483                                                                             \
1484   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1485           "Number of times to retry allocations when "                      \
1486           "blocked by the GC locker")                                       \
1487           range(0, max_uintx)                                               \
1488                                                                             \
1489   product(bool, UseCMSBestFit, true,                                        \
1490           "Use CMS best fit allocation strategy")                           \
1491                                                                             \
1492   product(uintx, ParallelGCBufferWastePct, 10,                              \
1493           "Wasted fraction of parallel allocation buffer")                  \
1494           range(0, 100)                                                     \
1495                                                                             \
1496   product(uintx, TargetPLABWastePct, 10,                                    \
1497           "Target wasted space in last buffer as percent of overall "       \
1498           "allocation")                                                     \
1499           range(1, 100)                                                     \
1500                                                                             \
1501   product(uintx, PLABWeight, 75,                                            \
1502           "Percentage (0-100) used to weight the current sample when "      \
1503           "computing exponentially decaying average for ResizePLAB")        \
1504           range(0, 100)                                                     \
1505                                                                             \
1506   product(bool, ResizePLAB, true,                                           \
1507           "Dynamically resize (survivor space) promotion LAB's")            \
1508                                                                             \
1509   product(int, ParGCArrayScanChunk, 50,                                     \
1510           "Scan a subset of object array and push remainder, if array is "  \
1511           "bigger than this")                                               \
1512           range(1, max_jint/3)                                              \
1513                                                                             \
1514   product(bool, ParGCUseLocalOverflow, false,                               \
1515           "Instead of a global overflow list, use local overflow stacks")   \
1516                                                                             \
1517   product(bool, ParGCTrimOverflow, true,                                    \
1518           "Eagerly trim the local overflow lists "                          \
1519           "(when ParGCUseLocalOverflow)")                                   \
1520                                                                             \
1521   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1522           "Simulate work queue overflow in ParNew")                         \
1523                                                                             \
1524   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1525           "An `interval' counter that determines how frequently "           \
1526           "we simulate overflow; a smaller number increases frequency")     \
1527                                                                             \
1528   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1529           "The desired number of objects to claim from the overflow list")  \
1530           range(0, max_uintx)                                               \
1531                                                                             \
1532   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1533           "The number of strides per worker thread that we divide up the "  \
1534           "card table scanning work into")                                  \
1535           range(1, max_uintx)                                               \
1536           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1537                                                                             \
1538   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1539           "The number of cards in each chunk of the parallel chunks used "  \
1540           "during card table scanning")                                     \
1541           range(1, max_intx)                                                \
1542           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1543                                                                             \
1544   product(uintx, OldPLABWeight, 50,                                         \
1545           "Percentage (0-100) used to weight the current sample when "      \
1546           "computing exponentially decaying average for resizing "          \
1547           "OldPLABSize")                                                    \
1548           range(0, 100)                                                     \
1549                                                                             \
1550   product(bool, ResizeOldPLAB, true,                                        \
1551           "Dynamically resize (old gen) promotion LAB's")                   \
1552                                                                             \
1553   product(size_t, CMSOldPLABMax, 1024,                                      \
1554           "Maximum size of CMS gen promotion LAB caches per worker "        \
1555           "per block size")                                                 \
1556           range(1, max_uintx)                                               \
1557           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1558                                                                             \
1559   product(size_t, CMSOldPLABMin, 16,                                        \
1560           "Minimum size of CMS gen promotion LAB caches per worker "        \
1561           "per block size")                                                 \
1562           range(1, max_uintx)                                               \
1563           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1564                                                                             \
1565   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1566           "Nominal number of refills of CMS gen promotion LAB cache "       \
1567           "per worker per block size")                                      \
1568           range(1, max_uintx)                                               \
1569                                                                             \
1570   product(bool, CMSOldPLABResizeQuicker, false,                             \
1571           "React on-the-fly during a scavenge to a sudden "                 \
1572           "change in block demand rate")                                    \
1573                                                                             \
1574   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1575           "The tolerance of the phase-change detector for on-the-fly "      \
1576           "PLAB resizing during a scavenge")                                \
1577           range(1, max_uintx)                                               \
1578                                                                             \
1579   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1580           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1581           "during a scavenge")                                              \
1582           range(1, max_uintx)                                               \
1583                                                                             \
1584   product(bool, AlwaysPreTouch, false,                                      \
1585           "Force all freshly committed pages to be pre-touched")            \
1586                                                                             \
1587   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1588           "Per-thread chunk size for parallel memory pre-touch.")           \
1589           range(1, SIZE_MAX / 2)                                            \
1590                                                                             \
1591   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1592           "The maximum size of young gen chosen by default per GC worker "  \
1593           "thread available")                                               \
1594           range(1, max_uintx)                                               \
1595                                                                             \
1596   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1597           "Percentage (0-100) used to add conservatism when computing the " \
1598           "duty cycle")                                                     \
1599           range(0, 100)                                                     \
1600                                                                             \
1601   product(uintx, CMSExpAvgFactor, 50,                                       \
1602           "Percentage (0-100) used to weight the current sample when "      \
1603           "computing exponential averages for CMS statistics")              \
1604           range(0, 100)                                                     \
1605                                                                             \
1606   product(uintx, CMS_FLSWeight, 75,                                         \
1607           "Percentage (0-100) used to weight the current sample when "      \
1608           "computing exponentially decaying averages for CMS FLS "          \
1609           "statistics")                                                     \
1610           range(0, 100)                                                     \
1611                                                                             \
1612   product(uintx, CMS_FLSPadding, 1,                                         \
1613           "The multiple of deviation from mean to use for buffering "       \
1614           "against volatility in free list demand")                         \
1615           range(0, max_juint)                                               \
1616                                                                             \
1617   product(uintx, FLSCoalescePolicy, 2,                                      \
1618           "CMS: aggressiveness level for coalescing, increasing "           \
1619           "from 0 to 4")                                                    \
1620           range(0, 4)                                                       \
1621                                                                             \
1622   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1623           "CMS: larger free blocks are always available for coalescing")    \
1624                                                                             \
1625   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1626           "CMS: the smaller the percentage the greater the coalescing "     \
1627           "force")                                                          \
1628           range(0.0, 1.0)                                                   \
1629                                                                             \
1630   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1631           "CMS: the factor by which to inflate estimated demand of small "  \
1632           "block sizes to prevent coalescing with an adjoining block")      \
1633           range(0.0, DBL_MAX)                                               \
1634                                                                             \
1635   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1636           "CMS: the factor by which to inflate estimated demand of large "  \
1637           "block sizes to prevent coalescing with an adjoining block")      \
1638           range(0.0, DBL_MAX)                                               \
1639                                                                             \
1640   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1641           "CMS: the factor by which to inflate estimated demand of small "  \
1642           "block sizes to prevent splitting to supply demand for smaller "  \
1643           "blocks")                                                         \
1644           range(0.0, DBL_MAX)                                               \
1645                                                                             \
1646   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1647           "CMS: the factor by which to inflate estimated demand of large "  \
1648           "block sizes to prevent splitting to supply demand for smaller "  \
1649           "blocks")                                                         \
1650           range(0.0, DBL_MAX)                                               \
1651                                                                             \
1652   product(bool, CMSExtrapolateSweep, false,                                 \
1653           "CMS: cushion for block demand during sweep")                     \
1654                                                                             \
1655   product(uintx, CMS_SweepWeight, 75,                                       \
1656           "Percentage (0-100) used to weight the current sample when "      \
1657           "computing exponentially decaying average for inter-sweep "       \
1658           "duration")                                                       \
1659           range(0, 100)                                                     \
1660                                                                             \
1661   product(uintx, CMS_SweepPadding, 1,                                       \
1662           "The multiple of deviation from mean to use for buffering "       \
1663           "against volatility in inter-sweep duration")                     \
1664           range(0, max_juint)                                               \
1665                                                                             \
1666   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1667           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1668           "duration exceeds this threshold in milliseconds")                \
1669           range(0, max_uintx)                                               \
1670                                                                             \
1671   product(bool, CMSClassUnloadingEnabled, true,                             \
1672           "Whether class unloading enabled when using CMS GC")              \
1673                                                                             \
1674   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1675           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1676           "count for which classes may not be unloaded")                    \
1677           range(0, max_uintx)                                               \
1678                                                                             \
1679   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1680           "Replenish an indexed free list with this number of chunks")      \
1681           range(1, max_uintx)                                               \
1682                                                                             \
1683   product(bool, CMSReplenishIntermediate, true,                             \
1684           "Replenish all intermediate free-list caches")                    \
1685                                                                             \
1686   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1687           "When satisfying batched demand, split blocks from the "          \
1688           "IndexedFreeList whose size is a multiple of requested size")     \
1689                                                                             \
1690   product(bool, CMSLoopWarn, false,                                         \
1691           "Warn in case of excessive CMS looping")                          \
1692                                                                             \
1693   /* where does the range max value of (max_jint - 1) come from? */         \
1694   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1695           "Maximum size of marking stack")                                  \
1696           range(1, (max_jint - 1))                                          \
1697                                                                             \
1698   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1699           "Size of marking stack")                                          \
1700           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1701                                                                             \
1702   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1703           "Simulate frequent marking stack / work queue overflow")          \
1704                                                                             \
1705   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1706           "An \"interval\" counter that determines how frequently "         \
1707           "to simulate overflow; a smaller number increases frequency")     \
1708                                                                             \
1709   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1710           "Maximum number of abortable preclean iterations, if > 0")        \
1711           range(0, max_uintx)                                               \
1712                                                                             \
1713   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1714           "Maximum time in abortable preclean (in milliseconds)")           \
1715           range(0, max_intx)                                                \
1716                                                                             \
1717   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1718           "Nominal minimum work per abortable preclean iteration")          \
1719           range(0, max_uintx)                                               \
1720                                                                             \
1721   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1722           "Time that we sleep between iterations when not given "           \
1723           "enough work per iteration")                                      \
1724           range(0, max_intx)                                                \
1725                                                                             \
1726   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1727   product(size_t, CMSRescanMultiple, 32,                                    \
1728           "Size (in cards) of CMS parallel rescan task")                    \
1729           range(1, SIZE_MAX / 4096)                                         \
1730           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1731                                                                             \
1732   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1733   product(size_t, CMSConcMarkMultiple, 32,                                  \
1734           "Size (in cards) of CMS concurrent MT marking task")              \
1735           range(1, SIZE_MAX / 4096)                                         \
1736           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1737                                                                             \
1738   product(bool, CMSAbortSemantics, false,                                   \
1739           "Whether abort-on-overflow semantics is implemented")             \
1740                                                                             \
1741   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1742           "Use the parallel initial mark.")                                 \
1743                                                                             \
1744   product(bool, CMSParallelRemarkEnabled, true,                             \
1745           "Whether parallel remark enabled (only if ParNewGC)")             \
1746                                                                             \
1747   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1748           "Whether parallel remark of survivor space "                      \
1749           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1750                                                                             \
1751   product(bool, CMSPLABRecordAlways, true,                                  \
1752           "Always record survivor space PLAB boundaries (effective only "   \
1753           "if CMSParallelSurvivorRemarkEnabled)")                           \
1754                                                                             \
1755   product(bool, CMSEdenChunksRecordAlways, true,                            \
1756           "Always record eden chunks used for the parallel initial mark "   \
1757           "or remark of eden")                                              \
1758                                                                             \
1759   product(bool, CMSConcurrentMTEnabled, true,                               \
1760           "Whether multi-threaded concurrent work enabled "                 \
1761           "(effective only if ParNewGC)")                                   \
1762                                                                             \
1763   product(bool, CMSPrecleaningEnabled, true,                                \
1764           "Whether concurrent precleaning enabled")                         \
1765                                                                             \
1766   product(uintx, CMSPrecleanIter, 3,                                        \
1767           "Maximum number of precleaning iteration passes")                 \
1768           range(0, 9)                                                       \
1769                                                                             \
1770   product(uintx, CMSPrecleanDenominator, 3,                                 \
1771           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1772           "ratio")                                                          \
1773           range(1, max_uintx)                                               \
1774           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1775                                                                             \
1776   product(uintx, CMSPrecleanNumerator, 2,                                   \
1777           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1778           "ratio")                                                          \
1779           range(0, max_uintx-1)                                             \
1780           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1781                                                                             \
1782   product(bool, CMSPrecleanRefLists1, true,                                 \
1783           "Preclean ref lists during (initial) preclean phase")             \
1784                                                                             \
1785   product(bool, CMSPrecleanRefLists2, false,                                \
1786           "Preclean ref lists during abortable preclean phase")             \
1787                                                                             \
1788   product(bool, CMSPrecleanSurvivors1, false,                               \
1789           "Preclean survivors during (initial) preclean phase")             \
1790                                                                             \
1791   product(bool, CMSPrecleanSurvivors2, true,                                \
1792           "Preclean survivors during abortable preclean phase")             \
1793                                                                             \
1794   product(uintx, CMSPrecleanThreshold, 1000,                                \
1795           "Do not iterate again if number of dirty cards is less than this")\
1796           range(100, max_uintx)                                             \
1797                                                                             \
1798   product(bool, CMSCleanOnEnter, true,                                      \
1799           "Clean-on-enter optimization for reducing number of dirty cards") \
1800                                                                             \
1801   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1802           "Choose variant (1,2) of verification following remark")          \
1803           range(1, 2)                                                       \
1804                                                                             \
1805   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1806           "If Eden size is below this, do not try to schedule remark")      \
1807           range(0, max_uintx)                                               \
1808                                                                             \
1809   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1810           "The Eden occupancy percentage (0-100) at which "                 \
1811           "to try and schedule remark pause")                               \
1812           range(0, 100)                                                     \
1813                                                                             \
1814   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1815           "Start sampling eden top at least before young gen "              \
1816           "occupancy reaches 1/<ratio> of the size at which "               \
1817           "we plan to schedule remark")                                     \
1818           range(1, max_uintx)                                               \
1819                                                                             \
1820   product(uintx, CMSSamplingGrain, 16*K,                                    \
1821           "The minimum distance between eden samples for CMS (see above)")  \
1822           range(ObjectAlignmentInBytes, max_uintx)                          \
1823           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1824                                                                             \
1825   product(bool, CMSScavengeBeforeRemark, false,                             \
1826           "Attempt scavenge before the CMS remark step")                    \
1827                                                                             \
1828   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1829           "Don't drain below this size per parallel worker/thief")          \
1830           range(1, max_juint)                                               \
1831           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1832                                                                             \
1833   manageable(intx, CMSWaitDuration, 2000,                                   \
1834           "Time in milliseconds that CMS thread waits for young GC")        \
1835           range(min_jint, max_jint)                                         \
1836                                                                             \
1837   develop(uintx, CMSCheckInterval, 1000,                                    \
1838           "Interval in milliseconds that CMS thread checks if it "          \
1839           "should start a collection cycle")                                \
1840                                                                             \
1841   product(bool, CMSYield, true,                                             \
1842           "Yield between steps of CMS")                                     \
1843                                                                             \
1844   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1845           "Bitmap operations should process at most this many bits "        \
1846           "between yields")                                                 \
1847           range(1, max_uintx)                                               \
1848           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1849                                                                             \
1850   product(bool, CMSPrintChunksInDump, false,                                \
1851           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1852           "trace level include more detailed information about the"         \
1853           "free chunks")                \
1854                                                                             \
1855   product(bool, CMSPrintObjectsInDump, false,                               \
1856           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1857           "trace level include more detailed information about the"         \
1858           "allocated objects")                                              \
1859                                                                             \
1860   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1861           "Verify that all references across the FLS boundary "             \
1862           "are to valid objects")                                           \
1863                                                                             \
1864   diagnostic(bool, FLSVerifyLists, false,                                   \
1865           "Do lots of (expensive) FreeListSpace verification")              \
1866                                                                             \
1867   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1868           "Do lots of (expensive) FLS index table verification")            \
1869                                                                             \
1870   develop(bool, FLSVerifyDictionary, false,                                 \
1871           "Do lots of (expensive) FLS dictionary verification")             \
1872                                                                             \
1873   develop(bool, VerifyBlockOffsetArray, false,                              \
1874           "Do (expensive) block offset array verification")                 \
1875                                                                             \
1876   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1877           "Maintain _unallocated_block in BlockOffsetArray "                \
1878           "(currently applicable only to CMS collector)")                   \
1879                                                                             \
1880   product(intx, RefDiscoveryPolicy, 0,                                      \
1881           "Select type of reference discovery policy: "                     \
1882           "reference-based(0) or referent-based(1)")                        \
1883           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1884                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1885                                                                             \
1886   product(bool, ParallelRefProcEnabled, false,                              \
1887           "Enable parallel reference processing whenever possible")         \
1888                                                                             \
1889   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1890           "Enable balancing of reference processing queues")                \
1891                                                                             \
1892   product(uintx, CMSTriggerRatio, 80,                                       \
1893           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1894           "allocated before a CMS collection cycle commences")              \
1895           range(0, 100)                                                     \
1896                                                                             \
1897   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1898           "Percentage CMS generation occupancy at which to "                \
1899           "initiate CMS collection for bootstrapping collection stats")     \
1900           range(0, 100)                                                     \
1901                                                                             \
1902   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1903           "Percentage CMS generation occupancy to start a CMS collection "  \
1904           "cycle. A negative value means that CMSTriggerRatio is used")     \
1905           range(min_intx, 100)                                              \
1906                                                                             \
1907   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1908           "The percent occupancy (IHOP) of the current old generation "     \
1909           "capacity above which a concurrent mark cycle will be initiated " \
1910           "Its value may change over time if adaptive IHOP is enabled, "    \
1911           "otherwise the value remains constant. "                          \
1912           "In the latter case a value of 0 will result as frequent as "     \
1913           "possible concurrent marking cycles. A value of 100 disables "    \
1914           "concurrent marking. "                                            \
1915           "Fragmentation waste in the old generation is not considered "    \
1916           "free space in this calculation. (G1 collector only)")            \
1917           range(0, 100)                                                     \
1918                                                                             \
1919   manageable(intx, CMSTriggerInterval, -1,                                  \
1920           "Commence a CMS collection cycle (at least) every so many "       \
1921           "milliseconds (0 permanently, -1 disabled)")                      \
1922           range(-1, max_intx)                                               \
1923                                                                             \
1924   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1925           "Only use occupancy as a criterion for starting a CMS collection")\
1926                                                                             \
1927   product(uintx, CMSIsTooFullPercentage, 98,                                \
1928           "An absolute ceiling above which CMS will always consider the "   \
1929           "unloading of classes when class unloading is enabled")           \
1930           range(0, 100)                                                     \
1931                                                                             \
1932   develop(bool, CMSTestInFreeList, false,                                   \
1933           "Check if the coalesced range is already in the "                 \
1934           "free lists as claimed")                                          \
1935                                                                             \
1936   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1937           "Check that all the garbage collected was returned to the "       \
1938           "free lists")                                                     \
1939                                                                             \
1940   notproduct(bool, ScavengeALot, false,                                     \
1941           "Force scavenge at every Nth exit from the runtime system "       \
1942           "(N=ScavengeALotInterval)")                                       \
1943                                                                             \
1944   develop(bool, FullGCALot, false,                                          \
1945           "Force full gc at every Nth exit from the runtime system "        \
1946           "(N=FullGCALotInterval)")                                         \
1947                                                                             \
1948   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1949           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1950                                                                             \
1951   notproduct(bool, PromotionFailureALot, false,                             \
1952           "Use promotion failure handling on every youngest generation "    \
1953           "collection")                                                     \
1954                                                                             \
1955   develop(uintx, PromotionFailureALotCount, 1000,                           \
1956           "Number of promotion failures occurring at PLAB "                 \
1957           "refill attempts (ParNew) or promotion attempts "                 \
1958           "(other young collectors)")                                       \
1959                                                                             \
1960   develop(uintx, PromotionFailureALotInterval, 5,                           \
1961           "Total collections between promotion failures a lot")             \
1962                                                                             \
1963   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1964           "Sleep time when sleep is used for yields")                       \
1965                                                                             \
1966   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1967           "Number of yields before a sleep is done during work stealing")   \
1968                                                                             \
1969   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1970           "Number of iterations in a spin loop between checks on "          \
1971           "time out of hard spin")                                          \
1972                                                                             \
1973   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1974           "Ratio of hard spins to calls to yield")                          \
1975                                                                             \
1976   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1977           "Number of object array elements to push onto the marking stack " \
1978           "before pushing a continuation entry")                            \
1979                                                                             \
1980   develop(bool, MetadataAllocationFailALot, false,                          \
1981           "Fail metadata allocations at intervals controlled by "           \
1982           "MetadataAllocationFailALotInterval")                             \
1983                                                                             \
1984   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1985           "Metadata allocation failure a lot interval")                     \
1986                                                                             \
1987   notproduct(bool, ExecuteInternalVMTests, false,                           \
1988           "Enable execution of internal VM tests")                          \
1989                                                                             \
1990   notproduct(bool, VerboseInternalVMTests, false,                           \
1991           "Turn on logging for internal VM tests.")                         \
1992                                                                             \
1993   product(bool, ExecutingUnitTests, false,                                  \
1994           "Whether the JVM is running unit tests or not")                   \
1995                                                                             \
1996   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1997                                                                             \
1998   product_pd(bool, ResizeTLAB,                                              \
1999           "Dynamically resize TLAB size for threads")                       \
2000                                                                             \
2001   product(bool, ZeroTLAB, false,                                            \
2002           "Zero out the newly created TLAB")                                \
2003                                                                             \
2004   product(bool, FastTLABRefill, true,                                       \
2005           "Use fast TLAB refill code")                                      \
2006                                                                             \
2007   product(bool, TLABStats, true,                                            \
2008           "Provide more detailed and expensive TLAB statistics.")           \
2009                                                                             \
2010   product_pd(bool, NeverActAsServerClassMachine,                            \
2011           "Never act like a server-class machine")                          \
2012                                                                             \
2013   product(bool, AlwaysActAsServerClassMachine, false,                       \
2014           "Always act like a server-class machine")                         \
2015                                                                             \
2016   product_pd(uint64_t, MaxRAM,                                              \
2017           "Real memory size (in bytes) used to set maximum heap size")      \
2018           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2019                                                                             \
2020   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2021           "Maximum ergonomically set heap size (in bytes); zero means use " \
2022           "MaxRAM / MaxRAMFraction")                                        \
2023           range(0, max_uintx)                                               \
2024                                                                             \
2025   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2026           "Use CGroup memory limit as physical memory limit for heap "      \
2027           "sizing")                                                         \
2028                                                                             \
2029   product(uintx, MaxRAMFraction, 4,                                         \
2030           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2031           "size")                                                           \
2032           range(1, max_uintx)                                               \
2033                                                                             \
2034   product(uintx, MinRAMFraction, 2,                                         \
2035           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2036           "size on systems with small physical memory size")                \
2037           range(1, max_uintx)                                               \
2038                                                                             \
2039   product(uintx, InitialRAMFraction, 64,                                    \
2040           "Fraction (1/n) of real memory used for initial heap size")       \
2041           range(1, max_uintx)                                               \
2042                                                                             \
2043   develop(uintx, MaxVirtMemFraction, 2,                                     \
2044           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2045           "determining maximum heap size")                                  \
2046                                                                             \
2047   product(bool, UseAdaptiveSizePolicy, true,                                \
2048           "Use adaptive generation sizing policies")                        \
2049                                                                             \
2050   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2051           "Use adaptive survivor sizing policies")                          \
2052                                                                             \
2053   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2054           "Use adaptive young-old sizing policies at minor collections")    \
2055                                                                             \
2056   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2057           "Use adaptive young-old sizing policies at major collections")    \
2058                                                                             \
2059   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2060           "Include statistics from System.gc() for adaptive size policy")   \
2061                                                                             \
2062   product(bool, UseAdaptiveGCBoundary, false,                               \
2063           "Allow young-old boundary to move")                               \
2064                                                                             \
2065   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2066           "Resize the virtual spaces of the young or old generations")      \
2067           range(-1, 1)                                                      \
2068                                                                             \
2069   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2070           "Policy for changing generation size for throughput goals")       \
2071           range(0, 1)                                                       \
2072                                                                             \
2073   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2074           "Number of steps where heuristics is used before data is used")   \
2075           range(0, max_uintx)                                               \
2076                                                                             \
2077   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2078           "Number of collections before the adaptive sizing is started")    \
2079                                                                             \
2080   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2081           "Collection interval for printing information; zero means never") \
2082           range(0, max_uintx)                                               \
2083                                                                             \
2084   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2085           "Use adaptive minimum footprint as a goal")                       \
2086                                                                             \
2087   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2088           "Weight given to exponential resizing, between 0 and 100")        \
2089           range(0, 100)                                                     \
2090                                                                             \
2091   product(uintx, AdaptiveTimeWeight,       25,                              \
2092           "Weight given to time in adaptive policy, between 0 and 100")     \
2093           range(0, 100)                                                     \
2094                                                                             \
2095   product(uintx, PausePadding, 1,                                           \
2096           "How much buffer to keep for pause time")                         \
2097           range(0, max_juint)                                               \
2098                                                                             \
2099   product(uintx, PromotedPadding, 3,                                        \
2100           "How much buffer to keep for promotion failure")                  \
2101           range(0, max_juint)                                               \
2102                                                                             \
2103   product(uintx, SurvivorPadding, 3,                                        \
2104           "How much buffer to keep for survivor overflow")                  \
2105           range(0, max_juint)                                               \
2106                                                                             \
2107   product(uintx, ThresholdTolerance, 10,                                    \
2108           "Allowed collection cost difference between generations")         \
2109           range(0, 100)                                                     \
2110                                                                             \
2111   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2112           "If collection costs are within margin, reduce both by full "     \
2113           "delta")                                                          \
2114           range(0, 100)                                                     \
2115                                                                             \
2116   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2117           "Adaptive size percentage change in young generation")            \
2118           range(0, 100)                                                     \
2119                                                                             \
2120   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2121           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2122           range(0, 100)                                                     \
2123                                                                             \
2124   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2125           "Decay factor to YoungedGenerationSizeSupplement")                \
2126           range(1, max_uintx)                                               \
2127                                                                             \
2128   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2129           "Adaptive size percentage change in tenured generation")          \
2130           range(0, 100)                                                     \
2131                                                                             \
2132   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2133           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2134           range(0, 100)                                                     \
2135                                                                             \
2136   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2137           "Decay factor to TenuredGenerationSizeIncrement")                 \
2138           range(1, max_uintx)                                               \
2139                                                                             \
2140   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2141           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2142           "or (G1 Only) the maximum GC time per MMU time slice")            \
2143           range(1, max_uintx - 1)                                           \
2144           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2145                                                                             \
2146   product(uintx, GCPauseIntervalMillis, 0,                                  \
2147           "Time slice for MMU specification")                               \
2148           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2149                                                                             \
2150   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2151           "Adaptive size policy maximum GC minor pause time goal "          \
2152           "in millisecond")                                                 \
2153           range(0, max_uintx)                                               \
2154                                                                             \
2155   product(uintx, GCTimeRatio, 99,                                           \
2156           "Adaptive size policy application time to GC time ratio")         \
2157           range(0, max_juint)                                               \
2158                                                                             \
2159   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2160           "Adaptive size scale down factor for shrinking")                  \
2161           range(1, max_uintx)                                               \
2162                                                                             \
2163   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2164           "Adaptive size decays the major cost for long major intervals")   \
2165                                                                             \
2166   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2167           "Time scale over which major costs decay")                        \
2168           range(0, max_uintx)                                               \
2169                                                                             \
2170   product(uintx, MinSurvivorRatio, 3,                                       \
2171           "Minimum ratio of young generation/survivor space size")          \
2172           range(3, max_uintx)                                               \
2173                                                                             \
2174   product(uintx, InitialSurvivorRatio, 8,                                   \
2175           "Initial ratio of young generation/survivor space size")          \
2176           range(0, max_uintx)                                               \
2177                                                                             \
2178   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2179           "Estimate of footprint other than Java Heap")                     \
2180           range(0, max_uintx)                                               \
2181                                                                             \
2182   product(bool, UseGCOverheadLimit, true,                                   \
2183           "Use policy to limit of proportion of time spent in GC "          \
2184           "before an OutOfMemory error is thrown")                          \
2185                                                                             \
2186   product(uintx, GCTimeLimit, 98,                                           \
2187           "Limit of the proportion of time spent in GC before "             \
2188           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2189           range(0, 100)                                                     \
2190                                                                             \
2191   product(uintx, GCHeapFreeLimit, 2,                                        \
2192           "Minimum percentage of free space after a full GC before an "     \
2193           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2194           range(0, 100)                                                     \
2195                                                                             \
2196   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2197           "Number of consecutive collections before gc time limit fires")   \
2198           range(1, max_uintx)                                               \
2199                                                                             \
2200   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2201           "How far ahead to prefetch destination area (<= 0 means off)")    \
2202           range(-1, max_jint)                                               \
2203                                                                             \
2204   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2205           "How far ahead to prefetch scan area (<= 0 means off)")           \
2206           range(-1, max_jint)                                               \
2207                                                                             \
2208   product(intx, PrefetchFieldsAhead, -1,                                    \
2209           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2210           range(-1, max_jint)                                               \
2211                                                                             \
2212   diagnostic(bool, VerifyDuringStartup, false,                              \
2213           "Verify memory system before executing any Java code "            \
2214           "during VM initialization")                                       \
2215                                                                             \
2216   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2217           "Verify system before exiting")                                   \
2218                                                                             \
2219   diagnostic(bool, VerifyBeforeGC, false,                                   \
2220           "Verify memory system before GC")                                 \
2221                                                                             \
2222   diagnostic(bool, VerifyAfterGC, false,                                    \
2223           "Verify memory system after GC")                                  \
2224                                                                             \
2225   diagnostic(bool, VerifyDuringGC, false,                                   \
2226           "Verify memory system during GC (between phases)")                \
2227                                                                             \
2228   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2229           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2230           "are enabled. One or more sub-systems can be specified "          \
2231           "in a comma separated string. Sub-systems are: "                  \
2232           "threads, heap, symbol_table, string_table, codecache, "          \
2233           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2234           "codecache_oops")                                                 \
2235                                                                             \
2236   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2237           "Enable parallel memory system verification")                     \
2238                                                                             \
2239   diagnostic(bool, DeferInitialCardMark, false,                             \
2240           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2241           "may arise from new_pre_store_barrier")                           \
2242                                                                             \
2243   product(bool, UseCondCardMark, false,                                     \
2244           "Check for already marked card before updating card table")       \
2245                                                                             \
2246   diagnostic(bool, VerifyRememberedSets, false,                             \
2247           "Verify GC remembered sets")                                      \
2248                                                                             \
2249   diagnostic(bool, VerifyObjectStartArray, true,                            \
2250           "Verify GC object start array if verify before/after")            \
2251                                                                             \
2252   product(bool, DisableExplicitGC, false,                                   \
2253           "Ignore calls to System.gc()")                                    \
2254                                                                             \
2255   notproduct(bool, CheckMemoryInitialization, false,                        \
2256           "Check memory initialization")                                    \
2257                                                                             \
2258   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2259           "Bind CMS Thread to CPU if possible")                             \
2260                                                                             \
2261   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2262           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2263           range(0, max_juint)                                               \
2264                                                                             \
2265   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2266           "Bind GCTaskThreads to CPUs if possible")                         \
2267                                                                             \
2268   product(bool, UseGCTaskAffinity, false,                                   \
2269           "Use worker affinity when asking for GCTasks")                    \
2270                                                                             \
2271   product(uintx, ProcessDistributionStride, 4,                              \
2272           "Stride through processors when distributing processes")          \
2273           range(0, max_juint)                                               \
2274                                                                             \
2275   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2276           "Number of times the coordinator GC thread will sleep while "     \
2277           "yielding before giving up and resuming GC")                      \
2278           range(0, max_juint)                                               \
2279                                                                             \
2280   product(uintx, CMSYieldSleepCount, 0,                                     \
2281           "Number of times a GC thread (minus the coordinator) "            \
2282           "will sleep while yielding before giving up and resuming GC")     \
2283           range(0, max_juint)                                               \
2284                                                                             \
2285   product(bool, PrintGC, false,                                             \
2286           "Print message at garbage collection. "                           \
2287           "Deprecated, use -Xlog:gc instead.")                              \
2288                                                                             \
2289   product(bool, PrintGCDetails, false,                                      \
2290           "Print more details at garbage collection. "                      \
2291           "Deprecated, use -Xlog:gc* instead.")                             \
2292                                                                             \
2293   develop(intx, ConcGCYieldTimeout, 0,                                      \
2294           "If non-zero, assert that GC threads yield within this "          \
2295           "number of milliseconds")                                         \
2296           range(0, max_intx)                                                \
2297                                                                             \
2298   develop(bool, TraceFinalizerRegistration, false,                          \
2299           "Trace registration of final references")                         \
2300                                                                             \
2301   notproduct(bool, TraceScavenge, false,                                    \
2302           "Trace scavenge")                                                 \
2303                                                                             \
2304   product(bool, IgnoreEmptyClassPaths, false,                               \
2305           "Ignore empty path elements in -classpath")                       \
2306                                                                             \
2307   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2308           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2309           "Initial size of the boot class loader data metaspace")           \
2310           range(30*K, max_uintx/BytesPerWord)                               \
2311           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2312                                                                             \
2313   product(bool, TraceYoungGenTime, false,                                   \
2314           "Trace accumulated time for young collection")                    \
2315                                                                             \
2316   product(bool, TraceOldGenTime, false,                                     \
2317           "Trace accumulated time for old collection")                      \
2318                                                                             \
2319   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2320           "Print heap layout in response to SIGBREAK")                      \
2321                                                                             \
2322   manageable(bool, PrintClassHistogram, false,                              \
2323           "Print a histogram of class instances")                           \
2324                                                                             \
2325   develop(bool, TraceGCTaskManager, false,                                  \
2326           "Trace actions of the GC task manager")                           \
2327                                                                             \
2328   develop(bool, TraceGCTaskQueue, false,                                    \
2329           "Trace actions of the GC task queues")                            \
2330                                                                             \
2331   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2332           "Trace marking phase in ParallelOldGC")                           \
2333                                                                             \
2334   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2335           "Trace dense prefix computation for ParallelOldGC")               \
2336                                                                             \
2337   develop(bool, IgnoreLibthreadGPFault, false,                              \
2338           "Suppress workaround for libthread GP fault")                     \
2339                                                                             \
2340   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2341           "The percentage of the used heap that the instances of a class "  \
2342           "must occupy for the class to generate a trace event")            \
2343           range(0.0, 100.0)                                                 \
2344                                                                             \
2345   /* JVMTI heap profiling */                                                \
2346                                                                             \
2347   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2348           "Trace JVMTI object tagging calls")                               \
2349                                                                             \
2350   diagnostic(bool, VerifyBeforeIteration, false,                            \
2351           "Verify memory system before JVMTI iteration")                    \
2352                                                                             \
2353   /* compiler interface */                                                  \
2354                                                                             \
2355   develop(bool, CIPrintCompilerName, false,                                 \
2356           "when CIPrint is active, print the name of the active compiler")  \
2357                                                                             \
2358   diagnostic(bool, CIPrintCompileQueue, false,                              \
2359           "display the contents of the compile queue whenever a "           \
2360           "compilation is enqueued")                                        \
2361                                                                             \
2362   develop(bool, CIPrintRequests, false,                                     \
2363           "display every request for compilation")                          \
2364                                                                             \
2365   product(bool, CITime, false,                                              \
2366           "collect timing information for compilation")                     \
2367                                                                             \
2368   develop(bool, CITimeVerbose, false,                                       \
2369           "be more verbose in compilation timings")                         \
2370                                                                             \
2371   develop(bool, CITimeEach, false,                                          \
2372           "display timing information after each successful compilation")   \
2373                                                                             \
2374   develop(bool, CICountOSR, false,                                          \
2375           "use a separate counter when assigning ids to osr compilations")  \
2376                                                                             \
2377   develop(bool, CICompileNatives, true,                                     \
2378           "compile native methods if supported by the compiler")            \
2379                                                                             \
2380   develop_pd(bool, CICompileOSR,                                            \
2381           "compile on stack replacement methods if supported by the "       \
2382           "compiler")                                                       \
2383                                                                             \
2384   develop(bool, CIPrintMethodCodes, false,                                  \
2385           "print method bytecodes of the compiled code")                    \
2386                                                                             \
2387   develop(bool, CIPrintTypeFlow, false,                                     \
2388           "print the results of ciTypeFlow analysis")                       \
2389                                                                             \
2390   develop(bool, CITraceTypeFlow, false,                                     \
2391           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2392                                                                             \
2393   develop(intx, OSROnlyBCI, -1,                                             \
2394           "OSR only at this bci.  Negative values mean exclude that bci")   \
2395                                                                             \
2396   /* compiler */                                                            \
2397                                                                             \
2398   /* notice: the max range value here is max_jint, not max_intx  */         \
2399   /* because of overflow issue                                   */         \
2400   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2401           "Number of compiler threads to run")                              \
2402           range(0, max_jint)                                                \
2403           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2404                                                                             \
2405   product(intx, CompilationPolicyChoice, 0,                                 \
2406           "which compilation policy (0-3)")                                 \
2407           range(0, 3)                                                       \
2408                                                                             \
2409   develop(bool, UseStackBanging, true,                                      \
2410           "use stack banging for stack overflow checks (required for "      \
2411           "proper StackOverflow handling; disable only to measure cost "    \
2412           "of stackbanging)")                                               \
2413                                                                             \
2414   develop(bool, UseStrictFP, true,                                          \
2415           "use strict fp if modifier strictfp is set")                      \
2416                                                                             \
2417   develop(bool, GenerateSynchronizationCode, true,                          \
2418           "generate locking/unlocking code for synchronized methods and "   \
2419           "monitors")                                                       \
2420                                                                             \
2421   develop(bool, GenerateRangeChecks, true,                                  \
2422           "Generate range checks for array accesses")                       \
2423                                                                             \
2424   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2425           "Generate code for implicit null checks")                         \
2426                                                                             \
2427   product_pd(bool, TrapBasedNullChecks,                                     \
2428           "Generate code for null checks that uses a cmp and trap "         \
2429           "instruction raising SIGTRAP.  This is only used if an access to" \
2430           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2431           "ImplicitNullChecks don't work (PPC64).")                         \
2432                                                                             \
2433   product(bool, PrintSafepointStatistics, false,                            \
2434           "Print statistics about safepoint synchronization")               \
2435                                                                             \
2436   product(intx, PrintSafepointStatisticsCount, 300,                         \
2437           "Total number of safepoint statistics collected "                 \
2438           "before printing them out")                                       \
2439           range(1, max_intx)                                                \
2440                                                                             \
2441   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2442           "Print safepoint statistics only when safepoint takes "           \
2443           "more than PrintSafepointSatisticsTimeout in millis")             \
2444   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2445   NOT_LP64(range(-1, max_intx))                                             \
2446                                                                             \
2447   product(bool, Inline, true,                                               \
2448           "Enable inlining")                                                \
2449                                                                             \
2450   product(bool, ClipInlining, true,                                         \
2451           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2452                                                                             \
2453   develop(bool, UseCHA, true,                                               \
2454           "Enable CHA")                                                     \
2455                                                                             \
2456   product(bool, UseTypeProfile, true,                                       \
2457           "Check interpreter profile for historically monomorphic calls")   \
2458                                                                             \
2459   diagnostic(bool, PrintInlining, false,                                    \
2460           "Print inlining optimizations")                                   \
2461                                                                             \
2462   product(bool, UsePopCountInstruction, false,                              \
2463           "Use population count instruction")                               \
2464                                                                             \
2465   develop(bool, EagerInitialization, false,                                 \
2466           "Eagerly initialize classes if possible")                         \
2467                                                                             \
2468   diagnostic(bool, LogTouchedMethods, false,                                \
2469           "Log methods which have been ever touched in runtime")            \
2470                                                                             \
2471   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2472           "Print all methods that have been ever touched in runtime")       \
2473                                                                             \
2474   develop(bool, TraceMethodReplacement, false,                              \
2475           "Print when methods are replaced do to recompilation")            \
2476                                                                             \
2477   develop(bool, PrintMethodFlushing, false,                                 \
2478           "Print the nmethods being flushed")                               \
2479                                                                             \
2480   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2481           "print statistics about method flushing")                         \
2482                                                                             \
2483   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2484           "Number of compiled code invocations after which "                \
2485           "the method is considered as hot by the flusher")                 \
2486           range(1, max_jint)                                                \
2487                                                                             \
2488   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2489           "Minimum number of sweeper passes before an nmethod "             \
2490           "can be flushed")                                                 \
2491           range(0, max_intx)                                                \
2492                                                                             \
2493   product(bool, UseCodeAging, true,                                         \
2494           "Insert counter to detect warm methods")                          \
2495                                                                             \
2496   diagnostic(bool, StressCodeAging, false,                                  \
2497           "Start with counters compiled in")                                \
2498                                                                             \
2499   develop(bool, UseRelocIndex, false,                                       \
2500           "Use an index to speed random access to relocations")             \
2501                                                                             \
2502   develop(bool, StressCodeBuffers, false,                                   \
2503           "Exercise code buffer expansion and other rare state changes")    \
2504                                                                             \
2505   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2506           "Generate extra debugging information for non-safepoints in "     \
2507           "nmethods")                                                       \
2508                                                                             \
2509   product(bool, PrintVMOptions, false,                                      \
2510           "Print flags that appeared on the command line")                  \
2511                                                                             \
2512   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2513           "Ignore unrecognized VM options")                                 \
2514                                                                             \
2515   product(bool, PrintCommandLineFlags, false,                               \
2516           "Print flags specified on command line or set by ergonomics")     \
2517                                                                             \
2518   product(bool, PrintFlagsInitial, false,                                   \
2519           "Print all VM flags before argument processing and exit VM")      \
2520                                                                             \
2521   product(bool, PrintFlagsFinal, false,                                     \
2522           "Print all VM flags after argument and ergonomic processing")     \
2523                                                                             \
2524   notproduct(bool, PrintFlagsWithComments, false,                           \
2525           "Print all VM flags with default values and descriptions and "    \
2526           "exit")                                                           \
2527                                                                             \
2528   product(bool, PrintFlagsRanges, false,                                    \
2529           "Print VM flags and their ranges and exit VM")                    \
2530                                                                             \
2531   diagnostic(bool, SerializeVMOutput, true,                                 \
2532           "Use a mutex to serialize output to tty and LogFile")             \
2533                                                                             \
2534   diagnostic(bool, DisplayVMOutput, true,                                   \
2535           "Display all VM output on the tty, independently of LogVMOutput") \
2536                                                                             \
2537   diagnostic(bool, LogVMOutput, false,                                      \
2538           "Save VM output to LogFile")                                      \
2539                                                                             \
2540   diagnostic(ccstr, LogFile, NULL,                                          \
2541           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2542           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2543                                                                             \
2544   product(ccstr, ErrorFile, NULL,                                           \
2545           "If an error occurs, save the error data to this file "           \
2546           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2547                                                                             \
2548   product(bool, DisplayVMOutputToStderr, false,                             \
2549           "If DisplayVMOutput is true, display all VM output to stderr")    \
2550                                                                             \
2551   product(bool, DisplayVMOutputToStdout, false,                             \
2552           "If DisplayVMOutput is true, display all VM output to stdout")    \
2553                                                                             \
2554   product(bool, UseHeavyMonitors, false,                                    \
2555           "use heavyweight instead of lightweight Java monitors")           \
2556                                                                             \
2557   product(bool, PrintStringTableStatistics, false,                          \
2558           "print statistics about the StringTable and SymbolTable")         \
2559                                                                             \
2560   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2561           "verify StringTable contents at exit")                            \
2562                                                                             \
2563   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2564           "print histogram of the symbol table")                            \
2565                                                                             \
2566   notproduct(bool, ExitVMOnVerifyError, false,                              \
2567           "standard exit from VM if bytecode verify error "                 \
2568           "(only in debug mode)")                                           \
2569                                                                             \
2570   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2571           "Call fatal if this exception is thrown.  Example: "              \
2572           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2573                                                                             \
2574   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2575           "Call fatal if the exception pointed by AbortVMOnException "      \
2576           "has this message")                                               \
2577                                                                             \
2578   develop(bool, DebugVtables, false,                                        \
2579           "add debugging code to vtable dispatch")                          \
2580                                                                             \
2581   notproduct(bool, PrintVtableStats, false,                                 \
2582           "print vtables stats at end of run")                              \
2583                                                                             \
2584   develop(bool, TraceCreateZombies, false,                                  \
2585           "trace creation of zombie nmethods")                              \
2586                                                                             \
2587   notproduct(bool, IgnoreLockingAssertions, false,                          \
2588           "disable locking assertions (for speed)")                         \
2589                                                                             \
2590   product(bool, RangeCheckElimination, true,                                \
2591           "Eliminate range checks")                                         \
2592                                                                             \
2593   develop_pd(bool, UncommonNullCast,                                        \
2594           "track occurrences of null in casts; adjust compiler tactics")    \
2595                                                                             \
2596   develop(bool, TypeProfileCasts,  true,                                    \
2597           "treat casts like calls for purposes of type profiling")          \
2598                                                                             \
2599   develop(bool, DelayCompilationDuringStartup, true,                        \
2600           "Delay invoking the compiler until main application class is "    \
2601           "loaded")                                                         \
2602                                                                             \
2603   develop(bool, CompileTheWorld, false,                                     \
2604           "Compile all methods in all classes in bootstrap class path "     \
2605             "(stress test)")                                                \
2606                                                                             \
2607   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2608           "Preload all classes used by a class before start loading")       \
2609                                                                             \
2610   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2611           "Force a safepoint every n compiles so sweeper can keep up")      \
2612                                                                             \
2613   develop(bool, FillDelaySlots, true,                                       \
2614           "Fill delay slots (on SPARC only)")                               \
2615                                                                             \
2616   develop(bool, TimeLivenessAnalysis, false,                                \
2617           "Time computation of bytecode liveness analysis")                 \
2618                                                                             \
2619   develop(bool, TraceLivenessGen, false,                                    \
2620           "Trace the generation of liveness analysis information")          \
2621                                                                             \
2622   notproduct(bool, TraceLivenessQuery, false,                               \
2623           "Trace queries of liveness analysis information")                 \
2624                                                                             \
2625   notproduct(bool, CollectIndexSetStatistics, false,                        \
2626           "Collect information about IndexSets")                            \
2627                                                                             \
2628   develop(bool, UseLoopSafepoints, true,                                    \
2629           "Generate Safepoint nodes in every loop")                         \
2630                                                                             \
2631   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2632           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2633           "Inline allocations larger than this in doublewords must go slow")\
2634                                                                             \
2635   product(bool, AggressiveOpts, false,                                      \
2636           "Enable aggressive optimizations - see arguments.cpp")            \
2637                                                                             \
2638   product_pd(bool, CompactStrings,                                          \
2639           "Enable Strings to use single byte chars in backing store")       \
2640                                                                             \
2641   product_pd(uintx, TypeProfileLevel,                                       \
2642           "=XYZ, with Z: Type profiling of arguments at call; "             \
2643                      "Y: Type profiling of return value at call; "          \
2644                      "X: Type profiling of parameters to methods; "         \
2645           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2646           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2647                                                                             \
2648   product(intx, TypeProfileArgsLimit,     2,                                \
2649           "max number of call arguments to consider for type profiling")    \
2650           range(0, 16)                                                      \
2651                                                                             \
2652   product(intx, TypeProfileParmsLimit,    2,                                \
2653           "max number of incoming parameters to consider for type profiling"\
2654           ", -1 for all")                                                   \
2655           range(-1, 64)                                                     \
2656                                                                             \
2657   /* statistics */                                                          \
2658   develop(bool, CountCompiledCalls, false,                                  \
2659           "Count method invocations")                                       \
2660                                                                             \
2661   notproduct(bool, CountRuntimeCalls, false,                                \
2662           "Count VM runtime calls")                                         \
2663                                                                             \
2664   develop(bool, CountJNICalls, false,                                       \
2665           "Count jni method invocations")                                   \
2666                                                                             \
2667   notproduct(bool, CountJVMCalls, false,                                    \
2668           "Count jvm method invocations")                                   \
2669                                                                             \
2670   notproduct(bool, CountRemovableExceptions, false,                         \
2671           "Count exceptions that could be replaced by branches due to "     \
2672           "inlining")                                                       \
2673                                                                             \
2674   notproduct(bool, ICMissHistogram, false,                                  \
2675           "Produce histogram of IC misses")                                 \
2676                                                                             \
2677   /* interpreter */                                                         \
2678   product_pd(bool, RewriteBytecodes,                                        \
2679           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2680                                                                             \
2681   product_pd(bool, RewriteFrequentPairs,                                    \
2682           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2683                                                                             \
2684   diagnostic(bool, PrintInterpreter, false,                                 \
2685           "Print the generated interpreter code")                           \
2686                                                                             \
2687   product(bool, UseInterpreter, true,                                       \
2688           "Use interpreter for non-compiled methods")                       \
2689                                                                             \
2690   develop(bool, UseFastSignatureHandlers, true,                             \
2691           "Use fast signature handlers for native calls")                   \
2692                                                                             \
2693   product(bool, UseLoopCounter, true,                                       \
2694           "Increment invocation counter on backward branch")                \
2695                                                                             \
2696   product_pd(bool, UseOnStackReplacement,                                   \
2697           "Use on stack replacement, calls runtime if invoc. counter "      \
2698           "overflows in loop")                                              \
2699                                                                             \
2700   notproduct(bool, TraceOnStackReplacement, false,                          \
2701           "Trace on stack replacement")                                     \
2702                                                                             \
2703   product_pd(bool, PreferInterpreterNativeStubs,                            \
2704           "Use always interpreter stubs for native methods invoked via "    \
2705           "interpreter")                                                    \
2706                                                                             \
2707   develop(bool, CountBytecodes, false,                                      \
2708           "Count number of bytecodes executed")                             \
2709                                                                             \
2710   develop(bool, PrintBytecodeHistogram, false,                              \
2711           "Print histogram of the executed bytecodes")                      \
2712                                                                             \
2713   develop(bool, PrintBytecodePairHistogram, false,                          \
2714           "Print histogram of the executed bytecode pairs")                 \
2715                                                                             \
2716   diagnostic(bool, PrintSignatureHandlers, false,                           \
2717           "Print code generated for native method signature handlers")      \
2718                                                                             \
2719   develop(bool, VerifyOops, false,                                          \
2720           "Do plausibility checks for oops")                                \
2721                                                                             \
2722   develop(bool, CheckUnhandledOops, false,                                  \
2723           "Check for unhandled oops in VM code")                            \
2724                                                                             \
2725   develop(bool, VerifyJNIFields, trueInDebug,                               \
2726           "Verify jfieldIDs for instance fields")                           \
2727                                                                             \
2728   notproduct(bool, VerifyJNIEnvThread, false,                               \
2729           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2730           "from JNI")                                                       \
2731                                                                             \
2732   develop(bool, VerifyFPU, false,                                           \
2733           "Verify FPU state (check for NaN's, etc.)")                       \
2734                                                                             \
2735   develop(bool, VerifyThread, false,                                        \
2736           "Watch the thread register for corruption (SPARC only)")          \
2737                                                                             \
2738   develop(bool, VerifyActivationFrameSize, false,                           \
2739           "Verify that activation frame didn't become smaller than its "    \
2740           "minimal size")                                                   \
2741                                                                             \
2742   develop(bool, TraceFrequencyInlining, false,                              \
2743           "Trace frequency based inlining")                                 \
2744                                                                             \
2745   develop_pd(bool, InlineIntrinsics,                                        \
2746           "Inline intrinsics that can be statically resolved")              \
2747                                                                             \
2748   product_pd(bool, ProfileInterpreter,                                      \
2749           "Profile at the bytecode level during interpretation")            \
2750                                                                             \
2751   develop(bool, TraceProfileInterpreter, false,                             \
2752           "Trace profiling at the bytecode level during interpretation. "   \
2753           "This outputs the profiling information collected to improve "    \
2754           "jit compilation.")                                               \
2755                                                                             \
2756   develop_pd(bool, ProfileTraps,                                            \
2757           "Profile deoptimization traps at the bytecode level")             \
2758                                                                             \
2759   product(intx, ProfileMaturityPercentage, 20,                              \
2760           "number of method invocations/branches (expressed as % of "       \
2761           "CompileThreshold) before using the method's profile")            \
2762           range(0, 100)                                                     \
2763                                                                             \
2764   diagnostic(bool, PrintMethodData, false,                                  \
2765           "Print the results of +ProfileInterpreter at end of run")         \
2766                                                                             \
2767   develop(bool, VerifyDataPointer, trueInDebug,                             \
2768           "Verify the method data pointer during interpreter profiling")    \
2769                                                                             \
2770   develop(bool, VerifyCompiledCode, false,                                  \
2771           "Include miscellaneous runtime verifications in nmethod code; "   \
2772           "default off because it disturbs nmethod size heuristics")        \
2773                                                                             \
2774   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2775           "Manually make GC thread crash then dump java stack trace;  "     \
2776           "Test only")                                                      \
2777                                                                             \
2778   /* compilation */                                                         \
2779   product(bool, UseCompiler, true,                                          \
2780           "Use Just-In-Time compilation")                                   \
2781                                                                             \
2782   develop(bool, TraceCompilationPolicy, false,                              \
2783           "Trace compilation policy")                                       \
2784                                                                             \
2785   develop(bool, TimeCompilationPolicy, false,                               \
2786           "Time the compilation policy")                                    \
2787                                                                             \
2788   product(bool, UseCounterDecay, true,                                      \
2789           "Adjust recompilation counters")                                  \
2790                                                                             \
2791   develop(intx, CounterHalfLifeTime,    30,                                 \
2792           "Half-life time of invocation counters (in seconds)")             \
2793                                                                             \
2794   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2795           "The minimum interval (in milliseconds) between invocation of "   \
2796           "CounterDecay")                                                   \
2797                                                                             \
2798   product(bool, AlwaysCompileLoopMethods, false,                            \
2799           "When using recompilation, never interpret methods "              \
2800           "containing loops")                                               \
2801                                                                             \
2802   product(bool, DontCompileHugeMethods, true,                               \
2803           "Do not compile methods > HugeMethodLimit")                       \
2804                                                                             \
2805   /* Bytecode escape analysis estimation. */                                \
2806   product(bool, EstimateArgEscape, true,                                    \
2807           "Analyze bytecodes to estimate escape state of arguments")        \
2808                                                                             \
2809   product(intx, BCEATraceLevel, 0,                                          \
2810           "How much tracing to do of bytecode escape analysis estimates "   \
2811           "(0-3)")                                                          \
2812           range(0, 3)                                                       \
2813                                                                             \
2814   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2815           "Maximum number of nested calls that are analyzed by BC EA")      \
2816           range(0, max_jint)                                                \
2817                                                                             \
2818   product(intx, MaxBCEAEstimateSize, 150,                                   \
2819           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2820           range(0, max_jint)                                                \
2821                                                                             \
2822   product(intx,  AllocatePrefetchStyle, 1,                                  \
2823           "0 = no prefetch, "                                               \
2824           "1 = generate prefetch instructions for each allocation, "        \
2825           "2 = use TLAB watermark to gate allocation prefetch, "            \
2826           "3 = generate one prefetch instruction per cache line")           \
2827           range(0, 3)                                                       \
2828                                                                             \
2829   product(intx,  AllocatePrefetchDistance, -1,                              \
2830           "Distance to prefetch ahead of allocation pointer. "              \
2831           "-1: use system-specific value (automatically determined")        \
2832           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2833                                                                             \
2834   product(intx,  AllocatePrefetchLines, 3,                                  \
2835           "Number of lines to prefetch ahead of array allocation pointer")  \
2836           range(1, 64)                                                      \
2837                                                                             \
2838   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2839           "Number of lines to prefetch ahead of instance allocation "       \
2840           "pointer")                                                        \
2841           range(1, 64)                                                      \
2842                                                                             \
2843   product(intx,  AllocatePrefetchStepSize, 16,                              \
2844           "Step size in bytes of sequential prefetch instructions")         \
2845           range(1, 512)                                                     \
2846           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2847                                                                             \
2848   product(intx,  AllocatePrefetchInstr, 0,                                  \
2849           "Select instruction to prefetch ahead of allocation pointer")     \
2850           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2851                                                                             \
2852   /* deoptimization */                                                      \
2853   develop(bool, TraceDeoptimization, false,                                 \
2854           "Trace deoptimization")                                           \
2855                                                                             \
2856   develop(bool, PrintDeoptimizationDetails, false,                          \
2857           "Print more information about deoptimization")                    \
2858                                                                             \
2859   develop(bool, DebugDeoptimization, false,                                 \
2860           "Tracing various information while debugging deoptimization")     \
2861                                                                             \
2862   product(intx, SelfDestructTimer, 0,                                       \
2863           "Will cause VM to terminate after a given time (in minutes) "     \
2864           "(0 means off)")                                                  \
2865           range(0, max_intx)                                                \
2866                                                                             \
2867   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2868           "The maximum number of lines in the stack trace for Java "        \
2869           "exceptions (0 means all)")                                       \
2870           range(0, max_jint/2)                                              \
2871                                                                             \
2872   /* notice: the max range value here is max_jint, not max_intx  */         \
2873   /* because of overflow issue                                   */         \
2874   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2875           "Guarantee a safepoint (at least) every so many milliseconds "    \
2876           "(0 means none)")                                                 \
2877           range(0, max_jint)                                                \
2878                                                                             \
2879   product(intx, SafepointTimeoutDelay, 10000,                               \
2880           "Delay in milliseconds for option SafepointTimeout")              \
2881   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2882   NOT_LP64(range(0, max_intx))                                              \
2883                                                                             \
2884   product(intx, NmethodSweepActivity, 10,                                   \
2885           "Removes cold nmethods from code cache if > 0. Higher values "    \
2886           "result in more aggressive sweeping")                             \
2887           range(0, 2000)                                                    \
2888                                                                             \
2889   notproduct(bool, LogSweeper, false,                                       \
2890           "Keep a ring buffer of sweeper activity")                         \
2891                                                                             \
2892   notproduct(intx, SweeperLogEntries, 1024,                                 \
2893           "Number of records in the ring buffer of sweeper activity")       \
2894                                                                             \
2895   notproduct(intx, MemProfilingInterval, 500,                               \
2896           "Time between each invocation of the MemProfiler")                \
2897                                                                             \
2898   develop(intx, MallocCatchPtr, -1,                                         \
2899           "Hit breakpoint when mallocing/freeing this pointer")             \
2900                                                                             \
2901   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2902           "List of assertions (file:line) to muzzle")                       \
2903                                                                             \
2904   develop(intx, StackPrintLimit, 100,                                       \
2905           "number of stack frames to print in VM-level stack dump")         \
2906                                                                             \
2907   notproduct(intx, MaxElementPrintSize, 256,                                \
2908           "maximum number of elements to print")                            \
2909                                                                             \
2910   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2911           "maximum number of subklasses to print when printing klass")      \
2912                                                                             \
2913   product(intx, MaxInlineLevel, 9,                                          \
2914           "maximum number of nested calls that are inlined")                \
2915           range(0, max_jint)                                                \
2916                                                                             \
2917   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2918           "maximum number of nested recursive calls that are inlined")      \
2919           range(0, max_jint)                                                \
2920                                                                             \
2921   develop(intx, MaxForceInlineLevel, 100,                                   \
2922           "maximum number of nested calls that are forced for inlining "    \
2923           "(using CompileCommand or marked w/ @ForceInline)")               \
2924           range(0, max_jint)                                                \
2925                                                                             \
2926   product_pd(intx, InlineSmallCode,                                         \
2927           "Only inline already compiled methods if their code size is "     \
2928           "less than this")                                                 \
2929           range(0, max_jint)                                                \
2930                                                                             \
2931   product(intx, MaxInlineSize, 35,                                          \
2932           "The maximum bytecode size of a method to be inlined")            \
2933           range(0, max_jint)                                                \
2934                                                                             \
2935   product_pd(intx, FreqInlineSize,                                          \
2936           "The maximum bytecode size of a frequent method to be inlined")   \
2937           range(0, max_jint)                                                \
2938                                                                             \
2939   product(intx, MaxTrivialSize, 6,                                          \
2940           "The maximum bytecode size of a trivial method to be inlined")    \
2941           range(0, max_jint)                                                \
2942                                                                             \
2943   product(intx, MinInliningThreshold, 250,                                  \
2944           "The minimum invocation count a method needs to have to be "      \
2945           "inlined")                                                        \
2946           range(0, max_jint)                                                \
2947                                                                             \
2948   develop(intx, MethodHistogramCutoff, 100,                                 \
2949           "The cutoff value for method invocation histogram (+CountCalls)") \
2950                                                                             \
2951   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2952           "Number of interpreted methods to show in profile")               \
2953                                                                             \
2954   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2955           "Number of compiled methods to show in profile")                  \
2956                                                                             \
2957   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2958           "Number of stub methods to show in profile")                      \
2959                                                                             \
2960   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2961           "Number of runtime stub nodes to show in profile")                \
2962                                                                             \
2963   product(intx, ProfileIntervalsTicks, 100,                                 \
2964           "Number of ticks between printing of interval profile "           \
2965           "(+ProfileIntervals)")                                            \
2966           range(0, max_intx)                                                \
2967                                                                             \
2968   notproduct(intx, ScavengeALotInterval,     1,                             \
2969           "Interval between which scavenge will occur with +ScavengeALot")  \
2970                                                                             \
2971   notproduct(intx, FullGCALotInterval,     1,                               \
2972           "Interval between which full gc will occur with +FullGCALot")     \
2973                                                                             \
2974   notproduct(intx, FullGCALotStart,     0,                                  \
2975           "For which invocation to start FullGCAlot")                       \
2976                                                                             \
2977   notproduct(intx, FullGCALotDummies,  32*K,                                \
2978           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2979           "to move")                                                        \
2980                                                                             \
2981   develop(intx, DontYieldALotInterval,    10,                               \
2982           "Interval between which yields will be dropped (milliseconds)")   \
2983                                                                             \
2984   develop(intx, ProfilerPCTickThreshold,    15,                             \
2985           "Number of ticks in a PC buckets to be a hotspot")                \
2986                                                                             \
2987   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2988           "Number of exits until DeoptimizeALot kicks in")                  \
2989                                                                             \
2990   notproduct(intx, ZombieALotInterval,     5,                               \
2991           "Number of exits until ZombieALot kicks in")                      \
2992                                                                             \
2993   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2994           "If non-zero, maximum number of words that malloc/realloc can "   \
2995           "allocate (for testing only)")                                    \
2996           range(0, max_uintx)                                               \
2997                                                                             \
2998   product(intx, TypeProfileWidth, 2,                                        \
2999           "Number of receiver types to record in call/cast profile")        \
3000           range(0, 8)                                                       \
3001                                                                             \
3002   develop(intx, BciProfileWidth,      2,                                    \
3003           "Number of return bci's to record in ret profile")                \
3004                                                                             \
3005   product(intx, PerMethodRecompilationCutoff, 400,                          \
3006           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3007           range(-1, max_intx)                                               \
3008                                                                             \
3009   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3010           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3011           range(-1, max_intx)                                               \
3012                                                                             \
3013   product(intx, PerMethodTrapLimit,  100,                                   \
3014           "Limit on traps (of one kind) in a method (includes inlines)")    \
3015           range(0, max_jint)                                                \
3016                                                                             \
3017   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3018           "Limit on speculative traps (of one kind) in a method "           \
3019           "(includes inlines)")                                             \
3020           range(0, max_jint)                                                \
3021                                                                             \
3022   product(intx, PerBytecodeTrapLimit,  4,                                   \
3023           "Limit on traps (of one kind) at a particular BCI")               \
3024           range(0, max_jint)                                                \
3025                                                                             \
3026   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3027           "Extra method data trap entries for speculation")                 \
3028                                                                             \
3029   develop(intx, InlineFrequencyRatio,    20,                                \
3030           "Ratio of call site execution to caller method invocation")       \
3031           range(0, max_jint)                                                \
3032                                                                             \
3033   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3034           "Count of call site execution necessary to trigger frequent "     \
3035           "inlining")                                                       \
3036           range(0, max_jint)                                                \
3037                                                                             \
3038   develop(intx, InlineThrowCount,    50,                                    \
3039           "Force inlining of interpreted methods that throw this often")    \
3040           range(0, max_jint)                                                \
3041                                                                             \
3042   develop(intx, InlineThrowMaxSize,   200,                                  \
3043           "Force inlining of throwing methods smaller than this")           \
3044           range(0, max_jint)                                                \
3045                                                                             \
3046   develop(intx, ProfilerNodeSize,  1024,                                    \
3047           "Size in K to allocate for the Profile Nodes of each thread")     \
3048           range(0, 1024)                                                    \
3049                                                                             \
3050   /* gc parameters */                                                       \
3051   product(size_t, InitialHeapSize, 0,                                       \
3052           "Initial heap size (in bytes); zero means use ergonomics")        \
3053           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3054                                                                             \
3055   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3056           "Maximum heap size (in bytes)")                                   \
3057           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3058                                                                             \
3059   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3060           "Initial tenured generation size (in bytes)")                     \
3061           range(0, max_uintx)                                               \
3062                                                                             \
3063   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3064           "Initial new generation size (in bytes)")                         \
3065           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3066                                                                             \
3067   product(size_t, MaxNewSize, max_uintx,                                    \
3068           "Maximum new generation size (in bytes), max_uintx means set "    \
3069           "ergonomically")                                                  \
3070           range(0, max_uintx)                                               \
3071                                                                             \
3072   product_pd(size_t, HeapBaseMinAddress,                                    \
3073           "OS specific low limit for heap base address")                    \
3074           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3075                                                                             \
3076   product(size_t, PretenureSizeThreshold, 0,                                \
3077           "Maximum size in bytes of objects allocated in DefNew "           \
3078           "generation; zero means no maximum")                              \
3079           range(0, max_uintx)                                               \
3080                                                                             \
3081   product(size_t, MinTLABSize, 2*K,                                         \
3082           "Minimum allowed TLAB size (in bytes)")                           \
3083           range(1, max_uintx/2)                                             \
3084           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3085                                                                             \
3086   product(size_t, TLABSize, 0,                                              \
3087           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3088           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3089                                                                             \
3090   product(size_t, YoungPLABSize, 4096,                                      \
3091           "Size of young gen promotion LAB's (in HeapWords)")               \
3092           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3093                                                                             \
3094   product(size_t, OldPLABSize, 1024,                                        \
3095           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3096           "of blocks to attempt to claim when refilling CMS LAB's")         \
3097           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3098                                                                             \
3099   product(uintx, TLABAllocationWeight, 35,                                  \
3100           "Allocation averaging weight")                                    \
3101           range(0, 100)                                                     \
3102                                                                             \
3103   /* Limit the lower bound of this flag to 1 as it is used  */              \
3104   /* in a division expression.                              */              \
3105   product(uintx, TLABWasteTargetPercent, 1,                                 \
3106           "Percentage of Eden that can be wasted")                          \
3107           range(1, 100)                                                     \
3108                                                                             \
3109   product(uintx, TLABRefillWasteFraction,    64,                            \
3110           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3111           range(1, max_juint)                                               \
3112                                                                             \
3113   product(uintx, TLABWasteIncrement,    4,                                  \
3114           "Increment allowed waste at slow allocation")                     \
3115           range(0, max_jint)                                                \
3116           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3117                                                                             \
3118   product(uintx, SurvivorRatio, 8,                                          \
3119           "Ratio of eden/survivor space size")                              \
3120           range(1, max_uintx-2)                                             \
3121           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3122                                                                             \
3123   product(uintx, NewRatio, 2,                                               \
3124           "Ratio of old/new generation sizes")                              \
3125           range(0, max_uintx-1)                                             \
3126                                                                             \
3127   product_pd(size_t, NewSizeThreadIncrease,                                 \
3128           "Additional size added to desired new generation size per "       \
3129           "non-daemon thread (in bytes)")                                   \
3130           range(0, max_uintx)                                               \
3131                                                                             \
3132   product_pd(size_t, MetaspaceSize,                                         \
3133           "Initial threshold (in bytes) at which a garbage collection "     \
3134           "is done to reduce Metaspace usage")                              \
3135           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3136                                                                             \
3137   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3138           "Maximum size of Metaspaces (in bytes)")                          \
3139           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3140                                                                             \
3141   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3142           "Maximum size of class area in Metaspace when compressed "        \
3143           "class pointers are used")                                        \
3144           range(1*M, 3*G)                                                   \
3145                                                                             \
3146   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3147           "The minimum percentage of heap free after GC to avoid expansion."\
3148           " For most GCs this applies to the old generation. In G1 and"     \
3149           " ParallelGC it applies to the whole heap.")                      \
3150           range(0, 100)                                                     \
3151           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3152                                                                             \
3153   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3154           "The maximum percentage of heap free after GC to avoid shrinking."\
3155           " For most GCs this applies to the old generation. In G1 and"     \
3156           " ParallelGC it applies to the whole heap.")                      \
3157           range(0, 100)                                                     \
3158           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3159                                                                             \
3160   product(bool, ShrinkHeapInSteps, true,                                    \
3161           "When disabled, informs the GC to shrink the java heap directly"  \
3162           " to the target size at the next full GC rather than requiring"   \
3163           " smaller steps during multiple full GCs.")                       \
3164                                                                             \
3165   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3166           "Number of milliseconds per MB of free space in the heap")        \
3167           range(0, max_intx)                                                \
3168           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3169                                                                             \
3170   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3171           "The minimum change in heap space due to GC (in bytes)")          \
3172           range(0, max_uintx)                                               \
3173                                                                             \
3174   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3175           "The minimum expansion of Metaspace (in bytes)")                  \
3176           range(0, max_uintx)                                               \
3177                                                                             \
3178   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3179           "The maximum percentage of Metaspace free after GC to avoid "     \
3180           "shrinking")                                                      \
3181           range(0, 100)                                                     \
3182           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3183                                                                             \
3184   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3185           "The minimum percentage of Metaspace free after GC to avoid "     \
3186           "expansion")                                                      \
3187           range(0, 99)                                                      \
3188           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3189                                                                             \
3190   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3191           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3192           range(0, max_uintx)                                               \
3193                                                                             \
3194   product(uintx, QueuedAllocationWarningCount, 0,                           \
3195           "Number of times an allocation that queues behind a GC "          \
3196           "will retry before printing a warning")                           \
3197           range(0, max_uintx)                                               \
3198                                                                             \
3199   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3200           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3201           range(0, max_uintx)                                               \
3202                                                                             \
3203   diagnostic(intx, VerifyGCLevel,     0,                                    \
3204           "Generation level at which to start +VerifyBefore/AfterGC")       \
3205           range(0, 1)                                                       \
3206                                                                             \
3207   product(uintx, MaxTenuringThreshold,    15,                               \
3208           "Maximum value for tenuring threshold")                           \
3209           range(0, markOopDesc::max_age + 1)                                \
3210           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3211                                                                             \
3212   product(uintx, InitialTenuringThreshold,    7,                            \
3213           "Initial value for tenuring threshold")                           \
3214           range(0, markOopDesc::max_age + 1)                                \
3215           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3216                                                                             \
3217   product(uintx, TargetSurvivorRatio,    50,                                \
3218           "Desired percentage of survivor space used after scavenge")       \
3219           range(0, 100)                                                     \
3220                                                                             \
3221   product(uintx, MarkSweepDeadRatio,     5,                                 \
3222           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3223           "Serial mark sweep treats this as both the minimum and maximum "  \
3224           "value. "                                                         \
3225           "CMS uses this value only if it falls back to mark sweep. "       \
3226           "Par compact uses a variable scale based on the density of the "  \
3227           "generation and treats this as the maximum value when the heap "  \
3228           "is either completely full or completely empty.  Par compact "    \
3229           "also has a smaller default value; see arguments.cpp.")           \
3230           range(0, 100)                                                     \
3231                                                                             \
3232   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3233           "How often should we fully compact the heap (ignoring the dead "  \
3234           "space parameters)")                                              \
3235           range(1, max_juint)                                               \
3236                                                                             \
3237   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3238           "Delay between expansion and allocation (in milliseconds)")       \
3239                                                                             \
3240   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3241           "Delay in scheduling GC workers (in milliseconds)")               \
3242                                                                             \
3243   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3244           "(Unstable) Number of times to iterate in safepoint loop "        \
3245           "before blocking VM threads ")                                    \
3246           range(-1, max_jint-1)                                             \
3247                                                                             \
3248   product(intx, DeferPollingPageLoopCount,     -1,                          \
3249           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3250           "before changing safepoint polling page to RO ")                  \
3251           range(-1, max_jint-1)                                             \
3252                                                                             \
3253   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3254           range(0, max_intx)                                                \
3255                                                                             \
3256   product(bool, PSChunkLargeArrays, true,                                   \
3257           "Process large arrays in chunks")                                 \
3258                                                                             \
3259   product(uintx, GCDrainStackTargetSize, 64,                                \
3260           "Number of entries we will try to leave on the stack "            \
3261           "during parallel gc")                                             \
3262           range(0, max_juint)                                               \
3263                                                                             \
3264   /* stack parameters */                                                    \
3265   product_pd(intx, StackYellowPages,                                        \
3266           "Number of yellow zone (recoverable overflows) pages of size "    \
3267           "4KB. If pages are bigger yellow zone is aligned up.")            \
3268           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3269                                                                             \
3270   product_pd(intx, StackRedPages,                                           \
3271           "Number of red zone (unrecoverable overflows) pages of size "     \
3272           "4KB. If pages are bigger red zone is aligned up.")               \
3273           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3274                                                                             \
3275   product_pd(intx, StackReservedPages,                                      \
3276           "Number of reserved zone (reserved to annotated methods) pages"   \
3277           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3278           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3279                                                                             \
3280   product(bool, RestrictReservedStack, true,                                \
3281           "Restrict @ReservedStackAccess to trusted classes")               \
3282                                                                             \
3283   /* greater stack shadow pages can't generate instruction to bang stack */ \
3284   product_pd(intx, StackShadowPages,                                        \
3285           "Number of shadow zone (for overflow checking) pages of size "    \
3286           "4KB. If pages are bigger shadow zone is aligned up. "            \
3287           "This should exceed the depth of the VM and native call stack.")  \
3288           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3289                                                                             \
3290   product_pd(intx, ThreadStackSize,                                         \
3291           "Thread Stack Size (in Kbytes)")                                  \
3292           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3293                                                                             \
3294   product_pd(intx, VMThreadStackSize,                                       \
3295           "Non-Java Thread Stack Size (in Kbytes)")                         \
3296           range(0, max_intx/(1 * K))                                        \
3297                                                                             \
3298   product_pd(intx, CompilerThreadStackSize,                                 \
3299           "Compiler Thread Stack Size (in Kbytes)")                         \
3300           range(0, max_intx/(1 * K))                                        \
3301                                                                             \
3302   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3303           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3304                                                                             \
3305   /* code cache parameters                                    */            \
3306   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3307           "Code cache segment size (in bytes) - smallest unit of "          \
3308           "allocation")                                                     \
3309           range(1, 1024)                                                    \
3310           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3311                                                                             \
3312   develop_pd(intx, CodeEntryAlignment,                                      \
3313           "Code entry alignment for generated code (in bytes)")             \
3314           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3315                                                                             \
3316   product_pd(intx, OptoLoopAlignment,                                       \
3317           "Align inner loops to zero relative to this modulus")             \
3318           range(1, 16)                                                      \
3319           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3320                                                                             \
3321   product_pd(uintx, InitialCodeCacheSize,                                   \
3322           "Initial code cache size (in bytes)")                             \
3323           range(0, max_uintx)                                               \
3324                                                                             \
3325   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3326           "Minimum code cache size (in bytes) required to start VM.")       \
3327           range(0, max_uintx)                                               \
3328                                                                             \
3329   product(bool, SegmentedCodeCache, false,                                  \
3330           "Use a segmented code cache")                                     \
3331                                                                             \
3332   product_pd(uintx, ReservedCodeCacheSize,                                  \
3333           "Reserved code cache size (in bytes) - maximum code cache size")  \
3334           range(0, max_uintx)                                               \
3335                                                                             \
3336   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3337           "Size of code heap with non-profiled methods (in bytes)")         \
3338           range(0, max_uintx)                                               \
3339                                                                             \
3340   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3341           "Size of code heap with profiled methods (in bytes)")             \
3342           range(0, max_uintx)                                               \
3343                                                                             \
3344   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3345           "Size of code heap with non-nmethods (in bytes)")                 \
3346           range(0, max_uintx)                                               \
3347                                                                             \
3348   product_pd(uintx, CodeCacheExpansionSize,                                 \
3349           "Code cache expansion size (in bytes)")                           \
3350           range(0, max_uintx)                                               \
3351                                                                             \
3352   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3353           "Minimum number of segments in a code cache block")               \
3354           range(1, 100)                                                     \
3355                                                                             \
3356   notproduct(bool, ExitOnFullCodeCache, false,                              \
3357           "Exit the VM if we fill the code cache")                          \
3358                                                                             \
3359   product(bool, UseCodeCacheFlushing, true,                                 \
3360           "Remove cold/old nmethods from the code cache")                   \
3361                                                                             \
3362   product(uintx, StartAggressiveSweepingAt, 10,                             \
3363           "Start aggressive sweeping if X[%] of the code cache is free."    \
3364           "Segmented code cache: X[%] of the non-profiled heap."            \
3365           "Non-segmented code cache: X[%] of the total code cache")         \
3366           range(0, 100)                                                     \
3367                                                                             \
3368   /* AOT parameters */                                                      \
3369   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3370           "Use AOT compiled files")                                         \
3371                                                                             \
3372   product(ccstrlist, AOTLibrary, NULL,                                      \
3373           "AOT library")                                                    \
3374                                                                             \
3375   product(bool, PrintAOT, false,                                            \
3376           "Print used AOT klasses and methods")                             \
3377                                                                             \
3378   notproduct(bool, PrintAOTStatistics, false,                               \
3379           "Print AOT statistics")                                           \
3380                                                                             \
3381   diagnostic(bool, UseAOTStrictLoading, false,                              \
3382           "Exit the VM if any of the AOT libraries has invalid config")     \
3383                                                                             \
3384   /* interpreter debugging */                                               \
3385   develop(intx, BinarySwitchThreshold, 5,                                   \
3386           "Minimal number of lookupswitch entries for rewriting to binary " \
3387           "switch")                                                         \
3388                                                                             \
3389   develop(intx, StopInterpreterAt, 0,                                       \
3390           "Stop interpreter execution at specified bytecode number")        \
3391                                                                             \
3392   develop(intx, TraceBytecodesAt, 0,                                        \
3393           "Trace bytecodes starting with specified bytecode number")        \
3394                                                                             \
3395   /* compiler interface */                                                  \
3396   develop(intx, CIStart, 0,                                                 \
3397           "The id of the first compilation to permit")                      \
3398                                                                             \
3399   develop(intx, CIStop, max_jint,                                           \
3400           "The id of the last compilation to permit")                       \
3401                                                                             \
3402   develop(intx, CIStartOSR, 0,                                              \
3403           "The id of the first osr compilation to permit "                  \
3404           "(CICountOSR must be on)")                                        \
3405                                                                             \
3406   develop(intx, CIStopOSR, max_jint,                                        \
3407           "The id of the last osr compilation to permit "                   \
3408           "(CICountOSR must be on)")                                        \
3409                                                                             \
3410   develop(intx, CIBreakAtOSR, -1,                                           \
3411           "The id of osr compilation to break at")                          \
3412                                                                             \
3413   develop(intx, CIBreakAt, -1,                                              \
3414           "The id of compilation to break at")                              \
3415                                                                             \
3416   product(ccstrlist, CompileOnly, "",                                       \
3417           "List of methods (pkg/class.name) to restrict compilation to")    \
3418                                                                             \
3419   product(ccstr, CompileCommandFile, NULL,                                  \
3420           "Read compiler commands from this file [.hotspot_compiler]")      \
3421                                                                             \
3422   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3423           "Read compiler directives from this file")                        \
3424                                                                             \
3425   product(ccstrlist, CompileCommand, "",                                    \
3426           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3427                                                                             \
3428   develop(bool, ReplayCompiles, false,                                      \
3429           "Enable replay of compilations from ReplayDataFile")              \
3430                                                                             \
3431   product(ccstr, ReplayDataFile, NULL,                                      \
3432           "File containing compilation replay information"                  \
3433           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3434                                                                             \
3435    product(ccstr, InlineDataFile, NULL,                                     \
3436           "File containing inlining replay information"                     \
3437           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3438                                                                             \
3439   develop(intx, ReplaySuppressInitializers, 2,                              \
3440           "Control handling of class initialization during replay: "        \
3441           "0 - don't do anything special; "                                 \
3442           "1 - treat all class initializers as empty; "                     \
3443           "2 - treat class initializers for application classes as empty; " \
3444           "3 - allow all class initializers to run during bootstrap but "   \
3445           "    pretend they are empty after starting replay")               \
3446           range(0, 3)                                                       \
3447                                                                             \
3448   develop(bool, ReplayIgnoreInitErrors, false,                              \
3449           "Ignore exceptions thrown during initialization for replay")      \
3450                                                                             \
3451   product(bool, DumpReplayDataOnError, true,                                \
3452           "Record replay data for crashing compiler threads")               \
3453                                                                             \
3454   product(bool, CICompilerCountPerCPU, false,                               \
3455           "1 compiler thread for log(N CPUs)")                              \
3456                                                                             \
3457   develop(intx, CIFireOOMAt,    -1,                                         \
3458           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3459           "(non-negative value throws OOM after this many CI accesses "     \
3460           "in each compile)")                                               \
3461   notproduct(intx, CICrashAt, -1,                                           \
3462           "id of compilation to trigger assert in compiler thread for "     \
3463           "the purpose of testing, e.g. generation of replay data")         \
3464   notproduct(bool, CIObjectFactoryVerify, false,                            \
3465           "enable potentially expensive verification in ciObjectFactory")   \
3466                                                                             \
3467   /* Priorities */                                                          \
3468   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3469                                                                             \
3470   product(intx, ThreadPriorityPolicy, 0,                                    \
3471           "0 : Normal.                                                     "\
3472           "    VM chooses priorities that are appropriate for normal       "\
3473           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3474           "    to normal native priority. Java priorities below "           \
3475           "    NORM_PRIORITY map to lower native priority values. On       "\
3476           "    Windows applications are allowed to use higher native       "\
3477           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3478           "    not use the highest possible native priority,               "\
3479           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3480           "    system threads. On Linux thread priorities are ignored      "\
3481           "    because the OS does not support static priority in          "\
3482           "    SCHED_OTHER scheduling class which is the only choice for   "\
3483           "    non-root, non-realtime applications.                        "\
3484           "1 : Aggressive.                                                 "\
3485           "    Java thread priorities map over to the entire range of      "\
3486           "    native thread priorities. Higher Java thread priorities map "\
3487           "    to higher native thread priorities. This policy should be   "\
3488           "    used with care, as sometimes it can cause performance       "\
3489           "    degradation in the application and/or the entire system. On "\
3490           "    Linux this policy requires root privilege.")                 \
3491           range(0, 1)                                                       \
3492                                                                             \
3493   product(bool, ThreadPriorityVerbose, false,                               \
3494           "Print priority changes")                                         \
3495                                                                             \
3496   product(intx, CompilerThreadPriority, -1,                                 \
3497           "The native priority at which compiler threads should run "       \
3498           "(-1 means no change)")                                           \
3499           range(min_jint, max_jint)                                         \
3500           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3501                                                                             \
3502   product(intx, VMThreadPriority, -1,                                       \
3503           "The native priority at which the VM thread should run "          \
3504           "(-1 means no change)")                                           \
3505           range(-1, 127)                                                    \
3506                                                                             \
3507   product(bool, CompilerThreadHintNoPreempt, true,                          \
3508           "(Solaris only) Give compiler threads an extra quanta")           \
3509                                                                             \
3510   product(bool, VMThreadHintNoPreempt, false,                               \
3511           "(Solaris only) Give VM thread an extra quanta")                  \
3512                                                                             \
3513   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3514           "Map Java priorities to OS priorities")                           \
3515           range(-1, 127)                                                    \
3516                                                                             \
3517   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3518           "Map Java priorities to OS priorities")                           \
3519           range(-1, 127)                                                    \
3520                                                                             \
3521   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3522           "Map Java priorities to OS priorities")                           \
3523           range(-1, 127)                                                    \
3524                                                                             \
3525   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3526           "Map Java priorities to OS priorities")                           \
3527           range(-1, 127)                                                    \
3528                                                                             \
3529   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3530           "Map Java priorities to OS priorities")                           \
3531           range(-1, 127)                                                    \
3532                                                                             \
3533   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3534           "Map Java priorities to OS priorities")                           \
3535           range(-1, 127)                                                    \
3536                                                                             \
3537   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3538           "Map Java priorities to OS priorities")                           \
3539           range(-1, 127)                                                    \
3540                                                                             \
3541   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3542           "Map Java priorities to OS priorities")                           \
3543           range(-1, 127)                                                    \
3544                                                                             \
3545   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3546           "Map Java priorities to OS priorities")                           \
3547           range(-1, 127)                                                    \
3548                                                                             \
3549   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3550           "Map Java priorities to OS priorities")                           \
3551           range(-1, 127)                                                    \
3552                                                                             \
3553   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3554           "Java thread priority 10 maps to critical scheduling priority")   \
3555                                                                             \
3556   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3557           "Compiler thread(s) run at critical scheduling priority")         \
3558                                                                             \
3559   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3560           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3561                                                                             \
3562   /* compiler debugging */                                                  \
3563   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3564           "First class to consider when using +CompileTheWorld")            \
3565                                                                             \
3566   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3567           "Last class to consider when using +CompileTheWorld")             \
3568                                                                             \
3569   develop(intx, NewCodeParameter,      0,                                   \
3570           "Testing Only: Create a dedicated integer parameter before "      \
3571           "putback")                                                        \
3572                                                                             \
3573   /* new oopmap storage allocation */                                       \
3574   develop(intx, MinOopMapAllocation,     8,                                 \
3575           "Minimum number of OopMap entries in an OopMapSet")               \
3576                                                                             \
3577   /* Background Compilation */                                              \
3578   develop(intx, LongCompileThreshold,     50,                               \
3579           "Used with +TraceLongCompiles")                                   \
3580                                                                             \
3581   /* recompilation */                                                       \
3582   product_pd(intx, CompileThreshold,                                        \
3583           "number of interpreted method invocations before (re-)compiling") \
3584           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3585                                                                             \
3586   product(double, CompileThresholdScaling, 1.0,                             \
3587           "Factor to control when first compilation happens "               \
3588           "(both with and without tiered compilation): "                    \
3589           "values greater than 1.0 delay counter overflow, "                \
3590           "values between 0 and 1.0 rush counter overflow, "                \
3591           "value of 1.0 leaves compilation thresholds unchanged "           \
3592           "value of 0.0 is equivalent to -Xint. "                           \
3593           ""                                                                \
3594           "Flag can be set as per-method option. "                          \
3595           "If a value is specified for a method, compilation thresholds "   \
3596           "for that method are scaled by both the value of the global flag "\
3597           "and the value of the per-method flag.")                          \
3598           range(0.0, DBL_MAX)                                               \
3599                                                                             \
3600   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3601           "Interpreter (tier 0) invocation notification frequency")         \
3602           range(0, 30)                                                      \
3603                                                                             \
3604   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3605           "C1 without MDO (tier 2) invocation notification frequency")      \
3606           range(0, 30)                                                      \
3607                                                                             \
3608   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3609           "C1 with MDO profiling (tier 3) invocation notification "         \
3610           "frequency")                                                      \
3611           range(0, 30)                                                      \
3612                                                                             \
3613   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3614           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3615           range(0, 30)                                                      \
3616                                                                             \
3617   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3618           "Interpreter (tier 0) invocation notification frequency")         \
3619           range(0, 30)                                                      \
3620                                                                             \
3621   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3622           "C1 without MDO (tier 2) invocation notification frequency")      \
3623           range(0, 30)                                                      \
3624                                                                             \
3625   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3626           "C1 with MDO profiling (tier 3) invocation notification "         \
3627           "frequency")                                                      \
3628           range(0, 30)                                                      \
3629                                                                             \
3630   product(intx, Tier2CompileThreshold, 0,                                   \
3631           "threshold at which tier 2 compilation is invoked")               \
3632           range(0, max_jint)                                                \
3633                                                                             \
3634   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3635           "Back edge threshold at which tier 2 compilation is invoked")     \
3636           range(0, max_jint)                                                \
3637                                                                             \
3638   product(intx, Tier3InvocationThreshold, 200,                              \
3639           "Compile if number of method invocations crosses this "           \
3640           "threshold")                                                      \
3641           range(0, max_jint)                                                \
3642                                                                             \
3643   product(intx, Tier3MinInvocationThreshold, 100,                           \
3644           "Minimum invocation to compile at tier 3")                        \
3645           range(0, max_jint)                                                \
3646                                                                             \
3647   product(intx, Tier3CompileThreshold, 2000,                                \
3648           "Threshold at which tier 3 compilation is invoked (invocation "   \
3649           "minimum must be satisfied)")                                     \
3650           range(0, max_jint)                                                \
3651                                                                             \
3652   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3653           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3654           range(0, max_jint)                                                \
3655                                                                             \
3656   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3657           "Compile if number of method invocations crosses this "           \
3658           "threshold if coming from AOT")                                   \
3659           range(0, max_jint)                                                \
3660                                                                             \
3661   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3662           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3663           range(0, max_jint)                                                \
3664                                                                             \
3665   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3666           "Threshold at which tier 3 compilation is invoked (invocation "   \
3667           "minimum must be satisfied) if coming from AOT")                  \
3668           range(0, max_jint)                                                \
3669                                                                             \
3670   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3671           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3672           "if coming from AOT")                                             \
3673           range(0, max_jint)                                                \
3674                                                                             \
3675   product(intx, Tier4InvocationThreshold, 5000,                             \
3676           "Compile if number of method invocations crosses this "           \
3677           "threshold")                                                      \
3678           range(0, max_jint)                                                \
3679                                                                             \
3680   product(intx, Tier4MinInvocationThreshold, 600,                           \
3681           "Minimum invocation to compile at tier 4")                        \
3682           range(0, max_jint)                                                \
3683                                                                             \
3684   product(intx, Tier4CompileThreshold, 15000,                               \
3685           "Threshold at which tier 4 compilation is invoked (invocation "   \
3686           "minimum must be satisfied")                                      \
3687           range(0, max_jint)                                                \
3688                                                                             \
3689   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3690           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3691           range(0, max_jint)                                                \
3692                                                                             \
3693   product(intx, Tier3DelayOn, 5,                                            \
3694           "If C2 queue size grows over this amount per compiler thread "    \
3695           "stop compiling at tier 3 and start compiling at tier 2")         \
3696           range(0, max_jint)                                                \
3697                                                                             \
3698   product(intx, Tier3DelayOff, 2,                                           \
3699           "If C2 queue size is less than this amount per compiler thread "  \
3700           "allow methods compiled at tier 2 transition to tier 3")          \
3701           range(0, max_jint)                                                \
3702                                                                             \
3703   product(intx, Tier3LoadFeedback, 5,                                       \
3704           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3705           "reaches this amount per compiler thread")                        \
3706           range(0, max_jint)                                                \
3707                                                                             \
3708   product(intx, Tier4LoadFeedback, 3,                                       \
3709           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3710           "reaches this amount per compiler thread")                        \
3711           range(0, max_jint)                                                \
3712                                                                             \
3713   product(intx, TieredCompileTaskTimeout, 50,                               \
3714           "Kill compile task if method was not used within "                \
3715           "given timeout in milliseconds")                                  \
3716           range(0, max_intx)                                                \
3717                                                                             \
3718   product(intx, TieredStopAtLevel, 4,                                       \
3719           "Stop at given compilation level")                                \
3720           range(0, 4)                                                       \
3721                                                                             \
3722   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3723           "Start profiling in interpreter if the counters exceed tier 3 "   \
3724           "thresholds by the specified percentage")                         \
3725           range(0, max_jint)                                                \
3726                                                                             \
3727   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3728           "Increase the compile threshold for C1 compilation if the code "  \
3729           "cache is filled by the specified percentage")                    \
3730           range(0, 99)                                                      \
3731                                                                             \
3732   product(intx, TieredRateUpdateMinTime, 1,                                 \
3733           "Minimum rate sampling interval (in milliseconds)")               \
3734           range(0, max_intx)                                                \
3735                                                                             \
3736   product(intx, TieredRateUpdateMaxTime, 25,                                \
3737           "Maximum rate sampling interval (in milliseconds)")               \
3738           range(0, max_intx)                                                \
3739                                                                             \
3740   product_pd(bool, TieredCompilation,                                       \
3741           "Enable tiered compilation")                                      \
3742                                                                             \
3743   product(bool, PrintTieredEvents, false,                                   \
3744           "Print tiered events notifications")                              \
3745                                                                             \
3746   product_pd(intx, OnStackReplacePercentage,                                \
3747           "NON_TIERED number of method invocations/branches (expressed as " \
3748           "% of CompileThreshold) before (re-)compiling OSR code")          \
3749           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3750                                                                             \
3751   product(intx, InterpreterProfilePercentage, 33,                           \
3752           "NON_TIERED number of method invocations/branches (expressed as " \
3753           "% of CompileThreshold) before profiling in the interpreter")     \
3754           range(0, 100)                                                     \
3755                                                                             \
3756   develop(intx, MaxRecompilationSearchLength,    10,                        \
3757           "The maximum number of frames to inspect when searching for "     \
3758           "recompilee")                                                     \
3759                                                                             \
3760   develop(intx, MaxInterpretedSearchLength,     3,                          \
3761           "The maximum number of interpreted frames to skip when searching "\
3762           "for recompilee")                                                 \
3763                                                                             \
3764   develop(intx, DesiredMethodLimit,  8000,                                  \
3765           "The desired maximum method size (in bytecodes) after inlining")  \
3766                                                                             \
3767   develop(intx, HugeMethodLimit,  8000,                                     \
3768           "Don't compile methods larger than this if "                      \
3769           "+DontCompileHugeMethods")                                        \
3770                                                                             \
3771   /* New JDK 1.4 reflection implementation */                               \
3772                                                                             \
3773   develop(intx, FastSuperclassLimit, 8,                                     \
3774           "Depth of hardwired instanceof accelerator array")                \
3775                                                                             \
3776   /* Properties for Java libraries  */                                      \
3777                                                                             \
3778   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3779           "Maximum total size of NIO direct-buffer allocations")            \
3780           range(0, max_jlong)                                               \
3781                                                                             \
3782   /* Flags used for temporary code during development  */                   \
3783                                                                             \
3784   diagnostic(bool, UseNewCode, false,                                       \
3785           "Testing Only: Use the new version while testing")                \
3786                                                                             \
3787   diagnostic(bool, UseNewCode2, false,                                      \
3788           "Testing Only: Use the new version while testing")                \
3789                                                                             \
3790   diagnostic(bool, UseNewCode3, false,                                      \
3791           "Testing Only: Use the new version while testing")                \
3792                                                                             \
3793   /* flags for performance data collection */                               \
3794                                                                             \
3795   product(bool, UsePerfData, true,                                          \
3796           "Flag to disable jvmstat instrumentation for performance testing "\
3797           "and problem isolation purposes")                                 \
3798                                                                             \
3799   product(bool, PerfDataSaveToFile, false,                                  \
3800           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3801                                                                             \
3802   product(ccstr, PerfDataSaveFile, NULL,                                    \
3803           "Save PerfData memory to the specified absolute pathname. "       \
3804           "The string %p in the file name (if present) "                    \
3805           "will be replaced by pid")                                        \
3806                                                                             \
3807   product(intx, PerfDataSamplingInterval, 50,                               \
3808           "Data sampling interval (in milliseconds)")                       \
3809           range(PeriodicTask::min_interval, max_jint)                       \
3810           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3811                                                                             \
3812   develop(bool, PerfTraceDataCreation, false,                               \
3813           "Trace creation of Performance Data Entries")                     \
3814                                                                             \
3815   develop(bool, PerfTraceMemOps, false,                                     \
3816           "Trace PerfMemory create/attach/detach calls")                    \
3817                                                                             \
3818   product(bool, PerfDisableSharedMem, false,                                \
3819           "Store performance data in standard memory")                      \
3820                                                                             \
3821   product(intx, PerfDataMemorySize, 32*K,                                   \
3822           "Size of performance data memory region. Will be rounded "        \
3823           "up to a multiple of the native os page size.")                   \
3824           range(128, 32*64*K)                                               \
3825                                                                             \
3826   product(intx, PerfMaxStringConstLength, 1024,                             \
3827           "Maximum PerfStringConstant string length before truncation")     \
3828           range(32, 32*K)                                                   \
3829                                                                             \
3830   product(bool, PerfAllowAtExitRegistration, false,                         \
3831           "Allow registration of atexit() methods")                         \
3832                                                                             \
3833   product(bool, PerfBypassFileSystemCheck, false,                           \
3834           "Bypass Win32 file system criteria checks (Windows Only)")        \
3835                                                                             \
3836   product(intx, UnguardOnExecutionViolation, 0,                             \
3837           "Unguard page and retry on no-execute fault (Win32 only) "        \
3838           "0=off, 1=conservative, 2=aggressive")                            \
3839           range(0, 2)                                                       \
3840                                                                             \
3841   /* Serviceability Support */                                              \
3842                                                                             \
3843   product(bool, ManagementServer, false,                                    \
3844           "Create JMX Management Server")                                   \
3845                                                                             \
3846   product(bool, DisableAttachMechanism, false,                              \
3847           "Disable mechanism that allows tools to attach to this VM")       \
3848                                                                             \
3849   product(bool, StartAttachListener, false,                                 \
3850           "Always start Attach Listener at VM startup")                     \
3851                                                                             \
3852   manageable(bool, PrintConcurrentLocks, false,                             \
3853           "Print java.util.concurrent locks in thread dump")                \
3854                                                                             \
3855   product(bool, TransmitErrorReport, false,                                 \
3856           "Enable error report transmission on erroneous termination")      \
3857                                                                             \
3858   product(ccstr, ErrorReportServer, NULL,                                   \
3859           "Override built-in error report server address")                  \
3860                                                                             \
3861   /* Shared spaces */                                                       \
3862                                                                             \
3863   product(bool, UseSharedSpaces, true,                                      \
3864           "Use shared spaces for metadata")                                 \
3865                                                                             \
3866   product(bool, VerifySharedSpaces, false,                                  \
3867           "Verify shared spaces (false for default archive, true for "      \
3868           "archive specified by -XX:SharedArchiveFile)")                    \
3869                                                                             \
3870   product(bool, RequireSharedSpaces, false,                                 \
3871           "Require shared spaces for metadata")                             \
3872                                                                             \
3873   product(bool, DumpSharedSpaces, false,                                    \
3874           "Special mode: JVM reads a class list, loads classes, builds "    \
3875           "shared spaces, and dumps the shared spaces to a file to be "     \
3876           "used in future JVM runs")                                        \
3877                                                                             \
3878   product(bool, PrintSharedSpaces, false,                                   \
3879           "Print usage of shared spaces")                                   \
3880                                                                             \
3881   product(bool, PrintSharedArchiveAndExit, false,                           \
3882           "Print shared archive file contents")                             \
3883                                                                             \
3884   product(bool, PrintSharedDictionary, false,                               \
3885           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3886           "dictionary")                                                     \
3887                                                                             \
3888   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3889           "Size of read-write space for metadata (in bytes)")               \
3890           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3891           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3892                                                                             \
3893   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3894           "Size of read-only space for metadata (in bytes)")                \
3895           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3896           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3897                                                                             \
3898   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3899           "Size of the shared miscellaneous data area (in bytes)")          \
3900           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3901           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3902                                                                             \
3903   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3904           "Size of the shared miscellaneous code area (in bytes)")          \
3905           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3906           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3907                                                                             \
3908   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3909           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3910           "Address to allocate shared memory region for class data")        \
3911           range(0, SIZE_MAX)                                                \
3912                                                                             \
3913   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3914           "Average number of symbols per bucket in shared table")           \
3915           range(2, 246)                                                     \
3916                                                                             \
3917   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3918           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3919           "classes. Just exclude them from the shared dictionary.")         \
3920                                                                             \
3921   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3922           "Print generated stub code for method handles")                   \
3923                                                                             \
3924   develop(bool, TraceMethodHandles, false,                                  \
3925           "trace internal method handle operations")                        \
3926                                                                             \
3927   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3928           "perform extra checks when constructing method handles")          \
3929                                                                             \
3930   diagnostic(bool, ShowHiddenFrames, false,                                 \
3931           "show method handle implementation frames (usually hidden)")      \
3932                                                                             \
3933   experimental(bool, TrustFinalNonStaticFields, false,                      \
3934           "trust final non-static declarations for constant folding")       \
3935                                                                             \
3936   diagnostic(bool, FoldStableValues, true,                                  \
3937           "Optimize loads from stable fields (marked w/ @Stable)")          \
3938                                                                             \
3939   develop(bool, TraceInvokeDynamic, false,                                  \
3940           "trace internal invoke dynamic operations")                       \
3941                                                                             \
3942   diagnostic(bool, PauseAtStartup,      false,                              \
3943           "Causes the VM to pause at startup time and wait for the pause "  \
3944           "file to be removed (default: ./vm.paused.<pid>)")                \
3945                                                                             \
3946   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3947           "The file to create and for whose removal to await when pausing " \
3948           "at startup. (default: ./vm.paused.<pid>)")                       \
3949                                                                             \
3950   diagnostic(bool, PauseAtExit, false,                                      \
3951           "Pause and wait for keypress on exit if a debugger is attached")  \
3952                                                                             \
3953   product(bool, ExtendedDTraceProbes,    false,                             \
3954           "Enable performance-impacting dtrace probes")                     \
3955                                                                             \
3956   product(bool, DTraceMethodProbes, false,                                  \
3957           "Enable dtrace probes for method-entry and method-exit")          \
3958                                                                             \
3959   product(bool, DTraceAllocProbes, false,                                   \
3960           "Enable dtrace probes for object allocation")                     \
3961                                                                             \
3962   product(bool, DTraceMonitorProbes, false,                                 \
3963           "Enable dtrace probes for monitor events")                        \
3964                                                                             \
3965   product(bool, RelaxAccessControlCheck, false,                             \
3966           "Relax the access control checks in the verifier")                \
3967                                                                             \
3968   product(uintx, StringTableSize, defaultStringTableSize,                   \
3969           "Number of buckets in the interned String table")                 \
3970           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3971                                                                             \
3972   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3973           "Number of buckets in the JVM internal Symbol table")             \
3974           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3975                                                                             \
3976   product(bool, UseStringDeduplication, false,                              \
3977           "Use string deduplication")                                       \
3978                                                                             \
3979   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3980           "A string must reach this age (or be promoted to an old region) " \
3981           "to be considered for deduplication")                             \
3982           range(1, markOopDesc::max_age)                                    \
3983                                                                             \
3984   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3985           "Force table resize every time the table is scanned")             \
3986                                                                             \
3987   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3988           "Force table rehash every time the table is scanned")             \
3989                                                                             \
3990   diagnostic(bool, WhiteBoxAPI, false,                                      \
3991           "Enable internal testing APIs")                                   \
3992                                                                             \
3993   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3994            "Default survivor space alignment in bytes")                     \
3995            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
3996                                                                             \
3997   product(bool , AllowNonVirtualCalls, false,                               \
3998           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3999                                                                             \
4000   product(ccstr, DumpLoadedClassList, NULL,                                 \
4001           "Dump the names all loaded classes, that could be stored into "   \
4002           "the CDS archive, in the specified file")                         \
4003                                                                             \
4004   product(ccstr, SharedClassListFile, NULL,                                 \
4005           "Override the default CDS class list")                            \
4006                                                                             \
4007   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4008           "Override the default location of the CDS archive file")          \
4009                                                                             \
4010   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4011           "Extra classlist for building the CDS archive file")              \
4012                                                                             \
4013   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4014           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4015           "Allocation less than this value will be allocated "              \
4016           "using malloc. Larger allocations will use mmap.")                \
4017                                                                             \
4018   experimental(bool, AlwaysAtomicAccesses, false,                           \
4019           "Accesses to all variables should always be atomic")              \
4020                                                                             \
4021   product(bool, EnableTracing, false,                                       \
4022           "Enable event-based tracing")                                     \
4023                                                                             \
4024   product(bool, UseLockedTracing, false,                                    \
4025           "Use locked-tracing when doing event-based tracing")              \
4026                                                                             \
4027   diagnostic(bool, UseUnalignedAccesses, false,                             \
4028           "Use unaligned memory accesses in Unsafe")                        \
4029                                                                             \
4030   product_pd(bool, PreserveFramePointer,                                    \
4031              "Use the FP register for holding the frame pointer "           \
4032              "and not as a general purpose register.")                      \
4033                                                                             \
4034   diagnostic(bool, CheckIntrinsics, true,                                   \
4035              "When a class C is loaded, check that "                        \
4036              "(1) all intrinsics defined by the VM for class C are present "\
4037              "in the loaded class file and are marked with the "            \
4038              "@HotSpotIntrinsicCandidate annotation, that "                 \
4039              "(2) there is an intrinsic registered for all loaded methods " \
4040              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4041              "annotation, and that "                                        \
4042              "(3) no orphan methods exist for class C (i.e., methods for "  \
4043              "which the VM declares an intrinsic but that are not declared "\
4044              "in the loaded class C. "                                      \
4045              "Check (3) is available only in debug builds.")                \
4046                                                                             \
4047   diagnostic_pd(intx, InitArrayShortSize,                                   \
4048           "Threshold small size (in bytes) for clearing arrays. "           \
4049           "Anything this size or smaller may get converted to discrete "    \
4050           "scalar stores.")                                                 \
4051           range(0, max_intx)                                                \
4052           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4053                                                                             \
4054   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4055              "Disable backwards compatibility for compile commands.")       \
4056                                                                             \
4057   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4058              "Print compiler directives on installation.")                  \
4059   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4060              "Limit on number of compiler directives.")
4061 
4062 
4063 /*
4064  *  Macros for factoring of globals
4065  */
4066 
4067 // Interface macros
4068 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4069 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4070 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4071 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4072 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4073 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4074 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4075 #ifdef PRODUCT
4076 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4077 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4078 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4079 #else
4080 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4081 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4082 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4083 #endif // PRODUCT
4084 // Special LP64 flags, product only needed for now.
4085 #ifdef _LP64
4086 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4087 #else
4088 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4089 #endif // _LP64
4090 
4091 // Implementation macros
4092 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4093 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4094 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4095 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4096 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4097 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4098 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4099 #ifdef PRODUCT
4100 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4101 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4102 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4103 #else
4104 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4105 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4106 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4107 #endif // PRODUCT
4108 #ifdef _LP64
4109 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4110 #else
4111 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4112 #endif // _LP64
4113 
4114 // Only materialize src code for range checking when required, ignore otherwise
4115 #define IGNORE_RANGE(a, b)
4116 // Only materialize src code for contraint checking when required, ignore otherwise
4117 #define IGNORE_CONSTRAINT(func,type)
4118 
4119 #define IGNORE_WRITEABLE(type)
4120 
4121 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4122               DECLARE_PD_DEVELOPER_FLAG, \
4123               DECLARE_PRODUCT_FLAG, \
4124               DECLARE_PD_PRODUCT_FLAG, \
4125               DECLARE_DIAGNOSTIC_FLAG, \
4126               DECLARE_PD_DIAGNOSTIC_FLAG, \
4127               DECLARE_EXPERIMENTAL_FLAG, \
4128               DECLARE_NOTPRODUCT_FLAG, \
4129               DECLARE_MANAGEABLE_FLAG, \
4130               DECLARE_PRODUCT_RW_FLAG, \
4131               DECLARE_LP64_PRODUCT_FLAG, \
4132               IGNORE_RANGE, \
4133               IGNORE_CONSTRAINT, \
4134               IGNORE_WRITEABLE)
4135 
4136 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4137                  DECLARE_PD_DEVELOPER_FLAG, \
4138                  DECLARE_PRODUCT_FLAG, \
4139                  DECLARE_PD_PRODUCT_FLAG, \
4140                  DECLARE_DIAGNOSTIC_FLAG, \
4141                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4142                  DECLARE_NOTPRODUCT_FLAG, \
4143                  IGNORE_RANGE, \
4144                  IGNORE_CONSTRAINT, \
4145                  IGNORE_WRITEABLE)
4146 
4147 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4148            DECLARE_PRODUCT_FLAG, \
4149            DECLARE_DIAGNOSTIC_FLAG, \
4150            DECLARE_EXPERIMENTAL_FLAG, \
4151            DECLARE_NOTPRODUCT_FLAG, \
4152            IGNORE_RANGE, \
4153            IGNORE_CONSTRAINT, \
4154            IGNORE_WRITEABLE)
4155 
4156 // Extensions
4157 
4158 #include "runtime/globals_ext.hpp"
4159 
4160 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP