1 /*
   2  * Copyright (c) 1997, 2016, 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 are used when available")       \
 661                                                                             \
 662   product(bool, UseFMA, false,                                              \
 663           "Control whether FMA instructions are used when available")       \
 664                                                                             \
 665   product(bool, UseSHA, false,                                              \
 666           "Control whether SHA instructions are used when available")       \
 667                                                                             \
 668   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 669           "Use intrinsics for GHASH versions of crypto")                    \
 670                                                                             \
 671   product(size_t, LargePageSizeInBytes, 0,                                  \
 672           "Large page size (0 to let VM choose the page size)")             \
 673           range(0, max_uintx)                                               \
 674                                                                             \
 675   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 676           "Use large pages if maximum heap is at least this big")           \
 677           range(0, max_uintx)                                               \
 678                                                                             \
 679   product(bool, ForceTimeHighResolution, false,                             \
 680           "Using high time resolution (for Win32 only)")                    \
 681                                                                             \
 682   develop(bool, TracePcPatching, false,                                     \
 683           "Trace usage of frame::patch_pc")                                 \
 684                                                                             \
 685   develop(bool, TraceRelocator, false,                                      \
 686           "Trace the bytecode relocator")                                   \
 687                                                                             \
 688   develop(bool, TraceLongCompiles, false,                                   \
 689           "Print out every time compilation is longer than "                \
 690           "a given threshold")                                              \
 691                                                                             \
 692   develop(bool, SafepointALot, false,                                       \
 693           "Generate a lot of safepoints. This works with "                  \
 694           "GuaranteedSafepointInterval")                                    \
 695                                                                             \
 696   product_pd(bool, BackgroundCompilation,                                   \
 697           "A thread requesting compilation is not blocked during "          \
 698           "compilation")                                                    \
 699                                                                             \
 700   product(bool, PrintVMQWaitTime, false,                                    \
 701           "Print out the waiting time in VM operation queue")               \
 702                                                                             \
 703   develop(bool, TraceOopMapGeneration, false,                               \
 704           "Show OopMapGeneration")                                          \
 705                                                                             \
 706   product(bool, MethodFlushing, true,                                       \
 707           "Reclamation of zombie and not-entrant methods")                  \
 708                                                                             \
 709   develop(bool, VerifyStack, false,                                         \
 710           "Verify stack of each thread when it is entering a runtime call") \
 711                                                                             \
 712   diagnostic(bool, ForceUnreachable, false,                                 \
 713           "Make all non code cache addresses to be unreachable by "         \
 714           "forcing use of 64bit literal fixups")                            \
 715                                                                             \
 716   notproduct(bool, StressDerivedPointers, false,                            \
 717           "Force scavenge when a derived pointer is detected on stack "     \
 718           "after rtm call")                                                 \
 719                                                                             \
 720   develop(bool, TraceDerivedPointers, false,                                \
 721           "Trace traversal of derived pointers on stack")                   \
 722                                                                             \
 723   notproduct(bool, TraceCodeBlobStacks, false,                              \
 724           "Trace stack-walk of codeblobs")                                  \
 725                                                                             \
 726   product(bool, PrintJNIResolving, false,                                   \
 727           "Used to implement -v:jni")                                       \
 728                                                                             \
 729   notproduct(bool, PrintRewrites, false,                                    \
 730           "Print methods that are being rewritten")                         \
 731                                                                             \
 732   product(bool, UseInlineCaches, true,                                      \
 733           "Use Inline Caches for virtual calls ")                           \
 734                                                                             \
 735   diagnostic(bool, InlineArrayCopy, true,                                   \
 736           "Inline arraycopy native that is known to be part of "            \
 737           "base library DLL")                                               \
 738                                                                             \
 739   diagnostic(bool, InlineObjectHash, true,                                  \
 740           "Inline Object::hashCode() native that is known to be part "      \
 741           "of base library DLL")                                            \
 742                                                                             \
 743   diagnostic(bool, InlineNatives, true,                                     \
 744           "Inline natives that are known to be part of base library DLL")   \
 745                                                                             \
 746   diagnostic(bool, InlineMathNatives, true,                                 \
 747           "Inline SinD, CosD, etc.")                                        \
 748                                                                             \
 749   diagnostic(bool, InlineClassNatives, true,                                \
 750           "Inline Class.isInstance, etc")                                   \
 751                                                                             \
 752   diagnostic(bool, InlineThreadNatives, true,                               \
 753           "Inline Thread.currentThread, etc")                               \
 754                                                                             \
 755   diagnostic(bool, InlineUnsafeOps, true,                                   \
 756           "Inline memory ops (native methods) from Unsafe")                 \
 757                                                                             \
 758   product(bool, CriticalJNINatives, true,                                   \
 759           "Check for critical JNI entry points")                            \
 760                                                                             \
 761   notproduct(bool, StressCriticalJNINatives, false,                         \
 762           "Exercise register saving code in critical natives")              \
 763                                                                             \
 764   diagnostic(bool, UseAESIntrinsics, false,                                 \
 765           "Use intrinsics for AES versions of crypto")                      \
 766                                                                             \
 767   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 768           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 769                                                                             \
 770   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 771           "Use intrinsics for SHA-1 crypto hash function. "                 \
 772           "Requires that UseSHA is enabled.")                               \
 773                                                                             \
 774   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 775           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 776           "Requires that UseSHA is enabled.")                               \
 777                                                                             \
 778   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 779           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 780           "Requires that UseSHA is enabled.")                               \
 781                                                                             \
 782   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 783           "use intrinsics for java.util.zip.CRC32")                         \
 784                                                                             \
 785   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 786           "use intrinsics for java.util.zip.CRC32C")                        \
 787                                                                             \
 788   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 789           "use intrinsics for java.util.zip.Adler32")                       \
 790                                                                             \
 791   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 792           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 793                                                                             \
 794   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 795          "do not expand intrinsics whose (internal) names appear here")     \
 796                                                                             \
 797   develop(bool, TraceCallFixup, false,                                      \
 798           "Trace all call fixups")                                          \
 799                                                                             \
 800   develop(bool, DeoptimizeALot, false,                                      \
 801           "Deoptimize at every exit from the runtime system")               \
 802                                                                             \
 803   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 804           "A comma separated list of bcis to deoptimize at")                \
 805                                                                             \
 806   product(bool, DeoptimizeRandom, false,                                    \
 807           "Deoptimize random frames on random exit from the runtime system")\
 808                                                                             \
 809   notproduct(bool, ZombieALot, false,                                       \
 810           "Create zombies (non-entrant) at exit from the runtime system")   \
 811                                                                             \
 812   product(bool, UnlinkSymbolsALot, false,                                   \
 813           "Unlink unreferenced symbols from the symbol table at safepoints")\
 814                                                                             \
 815   notproduct(bool, WalkStackALot, false,                                    \
 816           "Trace stack (no print) at every exit from the runtime system")   \
 817                                                                             \
 818   product(bool, Debugging, false,                                           \
 819           "Set when executing debug methods in debug.cpp "                  \
 820           "(to prevent triggering assertions)")                             \
 821                                                                             \
 822   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 823           "Enable strict checks that safepoints cannot happen for threads " \
 824           "that use NoSafepointVerifier")                                   \
 825                                                                             \
 826   notproduct(bool, VerifyLastFrame, false,                                  \
 827           "Verify oops on last frame on entry to VM")                       \
 828                                                                             \
 829   product(bool, FailOverToOldVerifier, true,                                \
 830           "Fail over to old verifier when split verifier fails")            \
 831                                                                             \
 832   develop(bool, ShowSafepointMsgs, false,                                   \
 833           "Show message about safepoint synchronization")                   \
 834                                                                             \
 835   product(bool, SafepointTimeout, false,                                    \
 836           "Time out and warn or fail after SafepointTimeoutDelay "          \
 837           "milliseconds if failed to reach safepoint")                      \
 838                                                                             \
 839   develop(bool, DieOnSafepointTimeout, false,                               \
 840           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 841                                                                             \
 842   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 843   /* typically, at most a few retries are needed                    */      \
 844   product(intx, SuspendRetryCount, 50,                                      \
 845           "Maximum retry count for an external suspend request")            \
 846           range(0, max_intx)                                                \
 847                                                                             \
 848   product(intx, SuspendRetryDelay, 5,                                       \
 849           "Milliseconds to delay per retry (* current_retry_count)")        \
 850           range(0, max_intx)                                                \
 851                                                                             \
 852   product(bool, AssertOnSuspendWaitFailure, false,                          \
 853           "Assert/Guarantee on external suspend wait failure")              \
 854                                                                             \
 855   product(bool, TraceSuspendWaitFailures, false,                            \
 856           "Trace external suspend wait failures")                           \
 857                                                                             \
 858   product(bool, MaxFDLimit, true,                                           \
 859           "Bump the number of file descriptors to maximum in Solaris")      \
 860                                                                             \
 861   diagnostic(bool, LogEvents, true,                                         \
 862           "Enable the various ring buffer event logs")                      \
 863                                                                             \
 864   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 865           "Number of ring buffer event logs")                               \
 866           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 867                                                                             \
 868   product(bool, BytecodeVerificationRemote, true,                           \
 869           "Enable the Java bytecode verifier for remote classes")           \
 870                                                                             \
 871   product(bool, BytecodeVerificationLocal, false,                           \
 872           "Enable the Java bytecode verifier for local classes")            \
 873                                                                             \
 874   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 875           "Force exceptions on FP stack under/overflow")                    \
 876                                                                             \
 877   develop(bool, VerifyStackAtCalls, false,                                  \
 878           "Verify that the stack pointer is unchanged after calls")         \
 879                                                                             \
 880   develop(bool, TraceJavaAssertions, false,                                 \
 881           "Trace java language assertions")                                 \
 882                                                                             \
 883   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 884           "Temporary - see javaClasses.cpp")                                \
 885                                                                             \
 886   notproduct(bool, PrintMallocFree, false,                                  \
 887           "Trace calls to C heap malloc/free allocation")                   \
 888                                                                             \
 889   notproduct(bool, VerifyCodeCache, false,                                  \
 890           "Verify code cache on memory allocation/deallocation")            \
 891                                                                             \
 892   develop(bool, UseMallocOnly, false,                                       \
 893           "Use only malloc/free for allocation (no resource area/arena)")   \
 894                                                                             \
 895   develop(bool, PrintMalloc, false,                                         \
 896           "Print all malloc/free calls")                                    \
 897                                                                             \
 898   develop(bool, PrintMallocStatistics, false,                               \
 899           "Print malloc/free statistics")                                   \
 900                                                                             \
 901   develop(bool, ZapResourceArea, trueInDebug,                               \
 902           "Zap freed resource/arena space with 0xABABABAB")                 \
 903                                                                             \
 904   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 905           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 906                                                                             \
 907   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 908           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 909                                                                             \
 910   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 911           "Zap allocated/freed stack segments with 0xFADFADED")             \
 912                                                                             \
 913   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 914           "Zap unused heap space with 0xBAADBABE")                          \
 915                                                                             \
 916   develop(bool, CheckZapUnusedHeapArea, false,                              \
 917           "Check zapping of unused heap space")                             \
 918                                                                             \
 919   develop(bool, ZapFillerObjects, trueInDebug,                              \
 920           "Zap filler objects with 0xDEAFBABE")                             \
 921                                                                             \
 922   develop(bool, PrintVMMessages, true,                                      \
 923           "Print VM messages on console")                                   \
 924                                                                             \
 925   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 926           "If > 0, provokes an error after VM initialization; the value "   \
 927           "determines which error to provoke. See test_error_handler() "    \
 928           "in debug.cpp.")                                                  \
 929                                                                             \
 930   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 931           "If > 0, provokes an error inside VM error handler (a secondary " \
 932           "crash). see test_error_handler() in debug.cpp.")                 \
 933                                                                             \
 934   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 935           "If true, tests SafeFetch inside error handler.")                 \
 936                                                                             \
 937   develop(bool, Verbose, false,                                             \
 938           "Print additional debugging information from other modes")        \
 939                                                                             \
 940   develop(bool, PrintMiscellaneous, false,                                  \
 941           "Print uncategorized debugging information (requires +Verbose)")  \
 942                                                                             \
 943   develop(bool, WizardMode, false,                                          \
 944           "Print much more debugging information")                          \
 945                                                                             \
 946   product(bool, ShowMessageBoxOnError, false,                               \
 947           "Keep process alive on VM fatal error")                           \
 948                                                                             \
 949   product(bool, CreateCoredumpOnCrash, true,                                \
 950           "Create core/mini dump on VM fatal error")                        \
 951                                                                             \
 952   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 953           "Timeout, in seconds, to limit the time spent on writing an "     \
 954           "error log in case of a crash.")                                  \
 955           range(0, (uint64_t)max_jlong/1000)                                \
 956                                                                             \
 957   product_pd(bool, UseOSErrorReporting,                                     \
 958           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 959                                                                             \
 960   product(bool, SuppressFatalErrorMessage, false,                           \
 961           "Report NO fatal error message (avoid deadlock)")                 \
 962                                                                             \
 963   product(ccstrlist, OnError, "",                                           \
 964           "Run user-defined commands on fatal error; see VMError.cpp "      \
 965           "for examples")                                                   \
 966                                                                             \
 967   product(ccstrlist, OnOutOfMemoryError, "",                                \
 968           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 969                                                                             \
 970   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 971           "Dump heap to file before any major stop-the-world GC")           \
 972                                                                             \
 973   manageable(bool, HeapDumpAfterFullGC, false,                              \
 974           "Dump heap to file after any major stop-the-world GC")            \
 975                                                                             \
 976   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 977           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 978                                                                             \
 979   manageable(ccstr, HeapDumpPath, NULL,                                     \
 980           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 981           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 982           "in the working directory)")                                      \
 983                                                                             \
 984   develop(bool, BreakAtWarning, false,                                      \
 985           "Execute breakpoint upon encountering VM warning")                \
 986                                                                             \
 987   develop(bool, UseFakeTimers, false,                                       \
 988           "Tell whether the VM should use system time or a fake timer")     \
 989                                                                             \
 990   product(ccstr, NativeMemoryTracking, "off",                               \
 991           "Native memory tracking options")                                 \
 992                                                                             \
 993   diagnostic(bool, PrintNMTStatistics, false,                               \
 994           "Print native memory tracking summary data if it is on")          \
 995                                                                             \
 996   diagnostic(bool, LogCompilation, false,                                   \
 997           "Log compilation activity in detail to LogFile")                  \
 998                                                                             \
 999   product(bool, PrintCompilation, false,                                    \
1000           "Print compilations")                                             \
1001                                                                             \
1002   diagnostic(bool, TraceNMethodInstalls, false,                             \
1003           "Trace nmethod installation")                                     \
1004                                                                             \
1005   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1006           "0: do not allow scavengable oops in the code cache; "            \
1007           "1: allow scavenging from the code cache; "                       \
1008           "2: emit as many constants as the compiler can see")              \
1009           range(0, 2)                                                       \
1010                                                                             \
1011   product(bool, AlwaysRestoreFPU, false,                                    \
1012           "Restore the FPU control word after every JNI call (expensive)")  \
1013                                                                             \
1014   diagnostic(bool, PrintCompilation2, false,                                \
1015           "Print additional statistics per compilation")                    \
1016                                                                             \
1017   diagnostic(bool, PrintAdapterHandlers, false,                             \
1018           "Print code generated for i2c/c2i adapters")                      \
1019                                                                             \
1020   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1021           "Verify that i2c/c2i adapters are called properly")               \
1022                                                                             \
1023   develop(bool, VerifyAdapterSharing, false,                                \
1024           "Verify that the code for shared adapters is the equivalent")     \
1025                                                                             \
1026   diagnostic(bool, PrintAssembly, false,                                    \
1027           "Print assembly code (using external disassembler.so)")           \
1028                                                                             \
1029   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1030           "Print options string passed to disassembler.so")                 \
1031                                                                             \
1032   notproduct(bool, PrintNMethodStatistics, false,                           \
1033           "Print a summary statistic for the generated nmethods")           \
1034                                                                             \
1035   diagnostic(bool, PrintNMethods, false,                                    \
1036           "Print assembly code for nmethods when generated")                \
1037                                                                             \
1038   diagnostic(bool, PrintNativeNMethods, false,                              \
1039           "Print assembly code for native nmethods when generated")         \
1040                                                                             \
1041   develop(bool, PrintDebugInfo, false,                                      \
1042           "Print debug information for all nmethods when generated")        \
1043                                                                             \
1044   develop(bool, PrintRelocations, false,                                    \
1045           "Print relocation information for all nmethods when generated")   \
1046                                                                             \
1047   develop(bool, PrintDependencies, false,                                   \
1048           "Print dependency information for all nmethods when generated")   \
1049                                                                             \
1050   develop(bool, PrintExceptionHandlers, false,                              \
1051           "Print exception handler tables for all nmethods when generated") \
1052                                                                             \
1053   develop(bool, StressCompiledExceptionHandlers, false,                     \
1054           "Exercise compiled exception handlers")                           \
1055                                                                             \
1056   develop(bool, InterceptOSException, false,                                \
1057           "Start debugger when an implicit OS (e.g. NULL) "                 \
1058           "exception happens")                                              \
1059                                                                             \
1060   product(bool, PrintCodeCache, false,                                      \
1061           "Print the code cache memory usage when exiting")                 \
1062                                                                             \
1063   develop(bool, PrintCodeCache2, false,                                     \
1064           "Print detailed usage information on the code cache when exiting")\
1065                                                                             \
1066   product(bool, PrintCodeCacheOnCompilation, false,                         \
1067           "Print the code cache memory usage each time a method is "        \
1068           "compiled")                                                       \
1069                                                                             \
1070   diagnostic(bool, PrintStubCode, false,                                    \
1071           "Print generated stub code")                                      \
1072                                                                             \
1073   product(bool, StackTraceInThrowable, true,                                \
1074           "Collect backtrace in throwable when exception happens")          \
1075                                                                             \
1076   product(bool, OmitStackTraceInFastThrow, true,                            \
1077           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1078                                                                             \
1079   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1080           "Print bytecode statistics when dumping profiler output")         \
1081                                                                             \
1082   product(bool, ProfilerRecordPC, false,                                    \
1083           "Collect ticks for each 16 byte interval of compiled code")       \
1084                                                                             \
1085   product(bool, ProfileVM, false,                                           \
1086           "Profile ticks that fall within VM (either in the VM Thread "     \
1087           "or VM code called through stubs)")                               \
1088                                                                             \
1089   product(bool, ProfileIntervals, false,                                    \
1090           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1091                                                                             \
1092   notproduct(bool, ProfilerCheckIntervals, false,                           \
1093           "Collect and print information on spacing of profiler ticks")     \
1094                                                                             \
1095   product(bool, PrintWarnings, true,                                        \
1096           "Print JVM warnings to output stream")                            \
1097                                                                             \
1098   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1099           "Print warnings for stalled SpinLocks")                           \
1100                                                                             \
1101   product(bool, RegisterFinalizersAtInit, true,                             \
1102           "Register finalizable objects at end of Object.<init> or "        \
1103           "after allocation")                                               \
1104                                                                             \
1105   develop(bool, RegisterReferences, true,                                   \
1106           "Tell whether the VM should register soft/weak/final/phantom "    \
1107           "references")                                                     \
1108                                                                             \
1109   develop(bool, IgnoreRewrites, false,                                      \
1110           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1111           "This is unsafe!")                                                \
1112                                                                             \
1113   develop(bool, PrintCodeCacheExtension, false,                             \
1114           "Print extension of code cache")                                  \
1115                                                                             \
1116   develop(bool, UsePrivilegedStack, true,                                   \
1117           "Enable the security JVM functions")                              \
1118                                                                             \
1119   develop(bool, ProtectionDomainVerification, true,                         \
1120           "Verify protection domain before resolution in system dictionary")\
1121                                                                             \
1122   product(bool, ClassUnloading, true,                                       \
1123           "Do unloading of classes")                                        \
1124                                                                             \
1125   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1126           "Do unloading of classes with a concurrent marking cycle")        \
1127                                                                             \
1128   develop(bool, DisableStartThread, false,                                  \
1129           "Disable starting of additional Java threads "                    \
1130           "(for debugging only)")                                           \
1131                                                                             \
1132   develop(bool, MemProfiling, false,                                        \
1133           "Write memory usage profiling to log file")                       \
1134                                                                             \
1135   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1136           "Print the system dictionary at exit")                            \
1137                                                                             \
1138   experimental(intx, PredictedLoadedClassCount, 0,                          \
1139           "Experimental: Tune loaded class cache starting size")            \
1140                                                                             \
1141   diagnostic(bool, UnsyncloadClass, false,                                  \
1142           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1143           "class loader must call VM synchronized for findClass "           \
1144           "and defineClass.")                                               \
1145                                                                             \
1146   product(bool, AlwaysLockClassLoader, false,                               \
1147           "Require the VM to acquire the class loader lock before calling " \
1148           "loadClass() even for class loaders registering "                 \
1149           "as parallel capable")                                            \
1150                                                                             \
1151   product(bool, AllowParallelDefineClass, false,                            \
1152           "Allow parallel defineClass requests for class loaders "          \
1153           "registering as parallel capable")                                \
1154                                                                             \
1155   product(bool, MustCallLoadClassInternal, false,                           \
1156           "Call loadClassInternal() rather than loadClass()")               \
1157                                                                             \
1158   product_pd(bool, DontYieldALot,                                           \
1159           "Throw away obvious excess yield calls")                          \
1160                                                                             \
1161   product(bool, ConvertSleepToYield, true,                                  \
1162           "Convert sleep(0) to thread yield ")                              \
1163                                                                             \
1164   product(bool, ConvertYieldToSleep, false,                                 \
1165           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1166           "behavior")                                                       \
1167                                                                             \
1168   develop(bool, UseDetachedThreads, true,                                   \
1169           "Use detached threads that are recycled upon termination "        \
1170           "(for Solaris only)")                                             \
1171                                                                             \
1172   product(bool, UseLWPSynchronization, true,                                \
1173           "Use LWP-based instead of libthread-based synchronization "       \
1174           "(SPARC only)")                                                   \
1175                                                                             \
1176   experimental(ccstr, SyncKnobs, NULL,                                      \
1177                "(Unstable) Various monitor synchronization tunables")       \
1178                                                                             \
1179   experimental(intx, EmitSync, 0,                                           \
1180                "(Unsafe, Unstable) "                                        \
1181                "Control emission of inline sync fast-path code")            \
1182                                                                             \
1183   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1184           range(0, max_jint)                                                \
1185                                                                             \
1186   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1187                                                                             \
1188   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1189                "Experimental Sync flags")                                   \
1190                                                                             \
1191   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1192                                                                             \
1193   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1194                                                                             \
1195   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1196                                                                             \
1197   experimental(intx, hashCode, 5,                                           \
1198                "(Unstable) select hashCode generation algorithm")           \
1199                                                                             \
1200   product(bool, FilterSpuriousWakeups, true,                                \
1201           "When true prevents OS-level spurious, or premature, wakeups "    \
1202           "from Object.wait (Ignored for Windows)")                         \
1203                                                                             \
1204   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1205                                                                             \
1206   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1207                                                                             \
1208   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1209                                                                             \
1210   develop(bool, UsePthreads, false,                                         \
1211           "Use pthread-based instead of libthread-based synchronization "   \
1212           "(SPARC only)")                                                   \
1213                                                                             \
1214   product(bool, ReduceSignalUsage, false,                                   \
1215           "Reduce the use of OS signals in Java and/or the VM")             \
1216                                                                             \
1217   develop_pd(bool, ShareVtableStubs,                                        \
1218           "Share vtable stubs (smaller code but worse branch prediction")   \
1219                                                                             \
1220   develop(bool, LoadLineNumberTables, true,                                 \
1221           "Tell whether the class file parser loads line number tables")    \
1222                                                                             \
1223   develop(bool, LoadLocalVariableTables, true,                              \
1224           "Tell whether the class file parser loads local variable tables") \
1225                                                                             \
1226   develop(bool, LoadLocalVariableTypeTables, true,                          \
1227           "Tell whether the class file parser loads local variable type"    \
1228           "tables")                                                         \
1229                                                                             \
1230   product(bool, AllowUserSignalHandlers, false,                             \
1231           "Do not complain if the application installs signal handlers "    \
1232           "(Solaris & Linux only)")                                         \
1233                                                                             \
1234   product(bool, UseSignalChaining, true,                                    \
1235           "Use signal-chaining to invoke signal handlers installed "        \
1236           "by the application (Solaris & Linux only)")                      \
1237                                                                             \
1238   product(bool, AllowJNIEnvProxy, false,                                    \
1239           "Allow JNIEnv proxies for jdbx")                                  \
1240                                                                             \
1241   product(bool, RestoreMXCSROnJNICalls, false,                              \
1242           "Restore MXCSR when returning from JNI calls")                    \
1243                                                                             \
1244   product(bool, CheckJNICalls, false,                                       \
1245           "Verify all arguments to JNI calls")                              \
1246                                                                             \
1247   product(bool, CheckEndorsedAndExtDirs, false,                             \
1248           "Verify the endorsed and extension directories are not used")     \
1249                                                                             \
1250   product(bool, UseFastJNIAccessors, true,                                  \
1251           "Use optimized versions of Get<Primitive>Field")                  \
1252                                                                             \
1253   product(intx, MaxJNILocalCapacity, 65536,                                 \
1254           "Maximum allowable local JNI handle capacity to "                 \
1255           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1256           "where <= 0 is unlimited, default: 65536")                        \
1257           range(min_intx, max_intx)                                         \
1258                                                                             \
1259   product(bool, EagerXrunInit, false,                                       \
1260           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1261           "but not all -Xrun libraries may support the state of the VM "    \
1262           "at this time")                                                   \
1263                                                                             \
1264   product(bool, PreserveAllAnnotations, false,                              \
1265           "Preserve RuntimeInvisibleAnnotations as well "                   \
1266           "as RuntimeVisibleAnnotations")                                   \
1267                                                                             \
1268   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1269           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1270                                                                             \
1271   product(bool, UseXMMForArrayCopy, false,                                  \
1272           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1273                                                                             \
1274   product(intx, FieldsAllocationStyle, 1,                                   \
1275           "0 - type based with oops first, "                                \
1276           "1 - with oops last, "                                            \
1277           "2 - oops in super and sub classes are together")                 \
1278           range(0, 2)                                                       \
1279                                                                             \
1280   product(bool, CompactFields, true,                                        \
1281           "Allocate nonstatic fields in gaps between previous fields")      \
1282                                                                             \
1283   notproduct(bool, PrintFieldLayout, false,                                 \
1284           "Print field layout for each class")                              \
1285                                                                             \
1286   /* Need to limit the extent of the padding to reasonable size.          */\
1287   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1288   /* aggressive prefetching, while still leaving the room for segregating */\
1289   /* among the distinct pages.                                            */\
1290   product(intx, ContendedPaddingWidth, 128,                                 \
1291           "How many bytes to pad the fields/classes marked @Contended with")\
1292           range(0, 8192)                                                    \
1293           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1294                                                                             \
1295   product(bool, EnableContended, true,                                      \
1296           "Enable @Contended annotation support")                           \
1297                                                                             \
1298   product(bool, RestrictContended, true,                                    \
1299           "Restrict @Contended to trusted classes")                         \
1300                                                                             \
1301   product(bool, UseBiasedLocking, true,                                     \
1302           "Enable biased locking in JVM")                                   \
1303                                                                             \
1304   product(intx, BiasedLockingStartupDelay, 4000,                            \
1305           "Number of milliseconds to wait before enabling biased locking")  \
1306           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1307           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1308                                                                             \
1309   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1310           "Print statistics of biased locking in JVM")                      \
1311                                                                             \
1312   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1313           "Threshold of number of revocations per type to try to "          \
1314           "rebias all objects in the heap of that type")                    \
1315           range(0, max_intx)                                                \
1316           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1317                                                                             \
1318   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1319           "Threshold of number of revocations per type to permanently "     \
1320           "revoke biases of all objects in the heap of that type")          \
1321           range(0, max_intx)                                                \
1322           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1323                                                                             \
1324   product(intx, BiasedLockingDecayTime, 25000,                              \
1325           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1326           "type after previous bulk rebias")                                \
1327           range(500, max_intx)                                              \
1328           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1329                                                                             \
1330   product(bool, ExitOnOutOfMemoryError, false,                              \
1331           "JVM exits on the first occurrence of an out-of-memory error")    \
1332                                                                             \
1333   product(bool, CrashOnOutOfMemoryError, false,                             \
1334           "JVM aborts, producing an error log and core/mini dump, on the "  \
1335           "first occurrence of an out-of-memory error")                     \
1336                                                                             \
1337   /* tracing */                                                             \
1338                                                                             \
1339   develop(bool, StressRewriter, false,                                      \
1340           "Stress linktime bytecode rewriting")                             \
1341                                                                             \
1342   product(ccstr, TraceJVMTI, NULL,                                          \
1343           "Trace flags for JVMTI functions and events")                     \
1344                                                                             \
1345   /* This option can change an EMCP method into an obsolete method. */      \
1346   /* This can affect tests that except specific methods to be EMCP. */      \
1347   /* This option should be used with caution.                       */      \
1348   product(bool, StressLdcRewrite, false,                                    \
1349           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1350                                                                             \
1351   /* change to false by default sometime after Mustang */                   \
1352   product(bool, VerifyMergedCPBytecodes, true,                              \
1353           "Verify bytecodes after RedefineClasses constant pool merging")   \
1354                                                                             \
1355   develop(bool, TraceBytecodes, false,                                      \
1356           "Trace bytecode execution")                                       \
1357                                                                             \
1358   develop(bool, TraceICs, false,                                            \
1359           "Trace inline cache changes")                                     \
1360                                                                             \
1361   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1362           "Trace method invocation counter overflow")                       \
1363                                                                             \
1364   develop(bool, TraceInlineCacheClearing, false,                            \
1365           "Trace clearing of inline caches in nmethods")                    \
1366                                                                             \
1367   develop(bool, TraceDependencies, false,                                   \
1368           "Trace dependencies")                                             \
1369                                                                             \
1370   develop(bool, VerifyDependencies, trueInDebug,                            \
1371           "Exercise and verify the compilation dependency mechanism")       \
1372                                                                             \
1373   develop(bool, TraceNewOopMapGeneration, false,                            \
1374           "Trace OopMapGeneration")                                         \
1375                                                                             \
1376   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1377           "Trace OopMapGeneration: print detailed cell states")             \
1378                                                                             \
1379   develop(bool, TimeOopMap, false,                                          \
1380           "Time calls to GenerateOopMap::compute_map() in sum")             \
1381                                                                             \
1382   develop(bool, TimeOopMap2, false,                                         \
1383           "Time calls to GenerateOopMap::compute_map() individually")       \
1384                                                                             \
1385   develop(bool, TraceOopMapRewrites, false,                                 \
1386           "Trace rewriting of method oops during oop map generation")       \
1387                                                                             \
1388   develop(bool, TraceICBuffer, false,                                       \
1389           "Trace usage of IC buffer")                                       \
1390                                                                             \
1391   develop(bool, TraceCompiledIC, false,                                     \
1392           "Trace changes of compiled IC")                                   \
1393                                                                             \
1394   /* gc */                                                                  \
1395                                                                             \
1396   product(bool, UseSerialGC, false,                                         \
1397           "Use the Serial garbage collector")                               \
1398                                                                             \
1399   product(bool, UseG1GC, false,                                             \
1400           "Use the Garbage-First garbage collector")                        \
1401                                                                             \
1402   product(bool, UseParallelGC, false,                                       \
1403           "Use the Parallel Scavenge garbage collector")                    \
1404                                                                             \
1405   product(bool, UseParallelOldGC, false,                                    \
1406           "Use the Parallel Old garbage collector")                         \
1407                                                                             \
1408   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1409           "How often should we maximally compact the heap (not allowing "   \
1410           "any dead space)")                                                \
1411           range(0, max_uintx)                                               \
1412                                                                             \
1413   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1414           "The collection count for the first maximum compaction")          \
1415           range(0, max_uintx)                                               \
1416                                                                             \
1417   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1418           "Use maximum compaction in the Parallel Old garbage collector "   \
1419           "for a system GC")                                                \
1420                                                                             \
1421   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1422           "The mean used by the parallel compact dead wood "                \
1423           "limiter (a number between 0-100)")                               \
1424           range(0, 100)                                                     \
1425                                                                             \
1426   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1427           "The standard deviation used by the parallel compact dead wood "  \
1428           "limiter (a number between 0-100)")                               \
1429           range(0, 100)                                                     \
1430                                                                             \
1431   product(uint, ParallelGCThreads, 0,                                       \
1432           "Number of parallel threads parallel gc will use")                \
1433           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1434                                                                             \
1435   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1436             "Use semaphore synchronization for the GC Threads, "            \
1437             "instead of synchronization based on mutexes")                  \
1438                                                                             \
1439   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1440           "Dynamically choose the number of parallel threads "              \
1441           "parallel gc will use")                                           \
1442                                                                             \
1443   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1444              "Inject thread creation failures for "                         \
1445              "UseDynamicNumberOfGCThreads")                                 \
1446                                                                             \
1447   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1448           "Force dynamic selection of the number of "                       \
1449           "parallel threads parallel gc will use to aid debugging")         \
1450                                                                             \
1451   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1452           "Size of heap (bytes) per GC thread used in calculating the "     \
1453           "number of GC threads")                                           \
1454           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1455                                                                             \
1456   product(uint, ConcGCThreads, 0,                                           \
1457           "Number of threads concurrent gc will use")                       \
1458           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1459                                                                             \
1460   product(uintx, GCTaskTimeStampEntries, 200,                               \
1461           "Number of time stamp entries per gc worker thread")              \
1462           range(1, max_uintx)                                               \
1463                                                                             \
1464   product(bool, AlwaysTenure, false,                                        \
1465           "Always tenure objects in eden (ParallelGC only)")                \
1466                                                                             \
1467   product(bool, NeverTenure, false,                                         \
1468           "Never tenure objects in eden, may tenure on overflow "           \
1469           "(ParallelGC only)")                                              \
1470                                                                             \
1471   product(bool, ScavengeBeforeFullGC, true,                                 \
1472           "Scavenge youngest generation before each full GC.")              \
1473                                                                             \
1474   product(bool, UseConcMarkSweepGC, false,                                  \
1475           "Use Concurrent Mark-Sweep GC in the old generation")             \
1476                                                                             \
1477   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1478           "A System.gc() request invokes a concurrent collection; "         \
1479           "(effective only when using concurrent collectors)")              \
1480                                                                             \
1481   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1482           "A System.gc() request invokes a concurrent collection and "      \
1483           "also unloads classes during such a concurrent gc cycle "         \
1484           "(effective only when UseConcMarkSweepGC)")                       \
1485                                                                             \
1486   product(bool, GCLockerInvokesConcurrent, false,                           \
1487           "The exit of a JNI critical section necessitating a scavenge, "   \
1488           "also kicks off a background concurrent collection")              \
1489                                                                             \
1490   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1491           "How much the GC can expand the eden by while the GC locker "     \
1492           "is active (as a percentage)")                                    \
1493           range(0, 100)                                                     \
1494                                                                             \
1495   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1496           "Number of times to retry allocations when "                      \
1497           "blocked by the GC locker")                                       \
1498           range(0, max_uintx)                                               \
1499                                                                             \
1500   product(bool, UseCMSBestFit, true,                                        \
1501           "Use CMS best fit allocation strategy")                           \
1502                                                                             \
1503   product(bool, UseParNewGC, false,                                         \
1504           "Use parallel threads in the new generation")                     \
1505                                                                             \
1506   product(uintx, ParallelGCBufferWastePct, 10,                              \
1507           "Wasted fraction of parallel allocation buffer")                  \
1508           range(0, 100)                                                     \
1509                                                                             \
1510   product(uintx, TargetPLABWastePct, 10,                                    \
1511           "Target wasted space in last buffer as percent of overall "       \
1512           "allocation")                                                     \
1513           range(1, 100)                                                     \
1514                                                                             \
1515   product(uintx, PLABWeight, 75,                                            \
1516           "Percentage (0-100) used to weight the current sample when "      \
1517           "computing exponentially decaying average for ResizePLAB")        \
1518           range(0, 100)                                                     \
1519                                                                             \
1520   product(bool, ResizePLAB, true,                                           \
1521           "Dynamically resize (survivor space) promotion LAB's")            \
1522                                                                             \
1523   product(int, ParGCArrayScanChunk, 50,                                     \
1524           "Scan a subset of object array and push remainder, if array is "  \
1525           "bigger than this")                                               \
1526           range(1, max_jint/3)                                              \
1527                                                                             \
1528   product(bool, ParGCUseLocalOverflow, false,                               \
1529           "Instead of a global overflow list, use local overflow stacks")   \
1530                                                                             \
1531   product(bool, ParGCTrimOverflow, true,                                    \
1532           "Eagerly trim the local overflow lists "                          \
1533           "(when ParGCUseLocalOverflow)")                                   \
1534                                                                             \
1535   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1536           "Simulate work queue overflow in ParNew")                         \
1537                                                                             \
1538   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1539           "An `interval' counter that determines how frequently "           \
1540           "we simulate overflow; a smaller number increases frequency")     \
1541                                                                             \
1542   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1543           "The desired number of objects to claim from the overflow list")  \
1544           range(0, max_uintx)                                               \
1545                                                                             \
1546   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1547           "The number of strides per worker thread that we divide up the "  \
1548           "card table scanning work into")                                  \
1549           range(1, max_uintx)                                               \
1550           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1551                                                                             \
1552   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1553           "The number of cards in each chunk of the parallel chunks used "  \
1554           "during card table scanning")                                     \
1555           range(1, max_intx)                                                \
1556           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1557                                                                             \
1558   product(uintx, OldPLABWeight, 50,                                         \
1559           "Percentage (0-100) used to weight the current sample when "      \
1560           "computing exponentially decaying average for resizing "          \
1561           "OldPLABSize")                                                    \
1562           range(0, 100)                                                     \
1563                                                                             \
1564   product(bool, ResizeOldPLAB, true,                                        \
1565           "Dynamically resize (old gen) promotion LAB's")                   \
1566                                                                             \
1567   product(size_t, CMSOldPLABMax, 1024,                                      \
1568           "Maximum size of CMS gen promotion LAB caches per worker "        \
1569           "per block size")                                                 \
1570           range(1, max_uintx)                                               \
1571           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1572                                                                             \
1573   product(size_t, CMSOldPLABMin, 16,                                        \
1574           "Minimum size of CMS gen promotion LAB caches per worker "        \
1575           "per block size")                                                 \
1576           range(1, max_uintx)                                               \
1577           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1578                                                                             \
1579   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1580           "Nominal number of refills of CMS gen promotion LAB cache "       \
1581           "per worker per block size")                                      \
1582           range(1, max_uintx)                                               \
1583                                                                             \
1584   product(bool, CMSOldPLABResizeQuicker, false,                             \
1585           "React on-the-fly during a scavenge to a sudden "                 \
1586           "change in block demand rate")                                    \
1587                                                                             \
1588   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1589           "The tolerance of the phase-change detector for on-the-fly "      \
1590           "PLAB resizing during a scavenge")                                \
1591           range(1, max_uintx)                                               \
1592                                                                             \
1593   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1594           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1595           "during a scavenge")                                              \
1596           range(1, max_uintx)                                               \
1597                                                                             \
1598   product(bool, AlwaysPreTouch, false,                                      \
1599           "Force all freshly committed pages to be pre-touched")            \
1600                                                                             \
1601   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1602           "Per-thread chunk size for parallel memory pre-touch.")           \
1603           range(1, SIZE_MAX / 2)                                            \
1604                                                                             \
1605   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1606           "The maximum size of young gen chosen by default per GC worker "  \
1607           "thread available")                                               \
1608           range(1, max_uintx)                                               \
1609                                                                             \
1610   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1611           "Percentage (0-100) used to add conservatism when computing the " \
1612           "duty cycle")                                                     \
1613           range(0, 100)                                                     \
1614                                                                             \
1615   product(uintx, CMSExpAvgFactor, 50,                                       \
1616           "Percentage (0-100) used to weight the current sample when "      \
1617           "computing exponential averages for CMS statistics")              \
1618           range(0, 100)                                                     \
1619                                                                             \
1620   product(uintx, CMS_FLSWeight, 75,                                         \
1621           "Percentage (0-100) used to weight the current sample when "      \
1622           "computing exponentially decaying averages for CMS FLS "          \
1623           "statistics")                                                     \
1624           range(0, 100)                                                     \
1625                                                                             \
1626   product(uintx, CMS_FLSPadding, 1,                                         \
1627           "The multiple of deviation from mean to use for buffering "       \
1628           "against volatility in free list demand")                         \
1629           range(0, max_juint)                                               \
1630                                                                             \
1631   product(uintx, FLSCoalescePolicy, 2,                                      \
1632           "CMS: aggressiveness level for coalescing, increasing "           \
1633           "from 0 to 4")                                                    \
1634           range(0, 4)                                                       \
1635                                                                             \
1636   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1637           "CMS: larger free blocks are always available for coalescing")    \
1638                                                                             \
1639   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1640           "CMS: the smaller the percentage the greater the coalescing "     \
1641           "force")                                                          \
1642           range(0.0, 1.0)                                                   \
1643                                                                             \
1644   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1645           "CMS: the factor by which to inflate estimated demand of small "  \
1646           "block sizes to prevent coalescing with an adjoining block")      \
1647           range(0.0, DBL_MAX)                                               \
1648                                                                             \
1649   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1650           "CMS: the factor by which to inflate estimated demand of large "  \
1651           "block sizes to prevent coalescing with an adjoining block")      \
1652           range(0.0, DBL_MAX)                                               \
1653                                                                             \
1654   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1655           "CMS: the factor by which to inflate estimated demand of small "  \
1656           "block sizes to prevent splitting to supply demand for smaller "  \
1657           "blocks")                                                         \
1658           range(0.0, DBL_MAX)                                               \
1659                                                                             \
1660   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1661           "CMS: the factor by which to inflate estimated demand of large "  \
1662           "block sizes to prevent splitting to supply demand for smaller "  \
1663           "blocks")                                                         \
1664           range(0.0, DBL_MAX)                                               \
1665                                                                             \
1666   product(bool, CMSExtrapolateSweep, false,                                 \
1667           "CMS: cushion for block demand during sweep")                     \
1668                                                                             \
1669   product(uintx, CMS_SweepWeight, 75,                                       \
1670           "Percentage (0-100) used to weight the current sample when "      \
1671           "computing exponentially decaying average for inter-sweep "       \
1672           "duration")                                                       \
1673           range(0, 100)                                                     \
1674                                                                             \
1675   product(uintx, CMS_SweepPadding, 1,                                       \
1676           "The multiple of deviation from mean to use for buffering "       \
1677           "against volatility in inter-sweep duration")                     \
1678           range(0, max_juint)                                               \
1679                                                                             \
1680   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1681           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1682           "duration exceeds this threshold in milliseconds")                \
1683           range(0, max_uintx)                                               \
1684                                                                             \
1685   product(bool, CMSClassUnloadingEnabled, true,                             \
1686           "Whether class unloading enabled when using CMS GC")              \
1687                                                                             \
1688   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1689           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1690           "count for which classes may not be unloaded")                    \
1691           range(0, max_uintx)                                               \
1692                                                                             \
1693   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1694           "Replenish an indexed free list with this number of chunks")      \
1695           range(1, max_uintx)                                               \
1696                                                                             \
1697   product(bool, CMSReplenishIntermediate, true,                             \
1698           "Replenish all intermediate free-list caches")                    \
1699                                                                             \
1700   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1701           "When satisfying batched demand, split blocks from the "          \
1702           "IndexedFreeList whose size is a multiple of requested size")     \
1703                                                                             \
1704   product(bool, CMSLoopWarn, false,                                         \
1705           "Warn in case of excessive CMS looping")                          \
1706                                                                             \
1707   /* where does the range max value of (max_jint - 1) come from? */         \
1708   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1709           "Maximum size of marking stack")                                  \
1710           range(1, (max_jint - 1))                                          \
1711                                                                             \
1712   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1713           "Size of marking stack")                                          \
1714           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1715                                                                             \
1716   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1717           "Simulate frequent marking stack / work queue overflow")          \
1718                                                                             \
1719   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1720           "An \"interval\" counter that determines how frequently "         \
1721           "to simulate overflow; a smaller number increases frequency")     \
1722                                                                             \
1723   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1724           "Maximum number of abortable preclean iterations, if > 0")        \
1725           range(0, max_uintx)                                               \
1726                                                                             \
1727   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1728           "Maximum time in abortable preclean (in milliseconds)")           \
1729           range(0, max_intx)                                                \
1730                                                                             \
1731   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1732           "Nominal minimum work per abortable preclean iteration")          \
1733           range(0, max_uintx)                                               \
1734                                                                             \
1735   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1736           "Time that we sleep between iterations when not given "           \
1737           "enough work per iteration")                                      \
1738           range(0, max_intx)                                                \
1739                                                                             \
1740   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1741   product(size_t, CMSRescanMultiple, 32,                                    \
1742           "Size (in cards) of CMS parallel rescan task")                    \
1743           range(1, SIZE_MAX / 4096)                                         \
1744           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1745                                                                             \
1746   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1747   product(size_t, CMSConcMarkMultiple, 32,                                  \
1748           "Size (in cards) of CMS concurrent MT marking task")              \
1749           range(1, SIZE_MAX / 4096)                                         \
1750           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1751                                                                             \
1752   product(bool, CMSAbortSemantics, false,                                   \
1753           "Whether abort-on-overflow semantics is implemented")             \
1754                                                                             \
1755   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1756           "Use the parallel initial mark.")                                 \
1757                                                                             \
1758   product(bool, CMSParallelRemarkEnabled, true,                             \
1759           "Whether parallel remark enabled (only if ParNewGC)")             \
1760                                                                             \
1761   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1762           "Whether parallel remark of survivor space "                      \
1763           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1764                                                                             \
1765   product(bool, CMSPLABRecordAlways, true,                                  \
1766           "Always record survivor space PLAB boundaries (effective only "   \
1767           "if CMSParallelSurvivorRemarkEnabled)")                           \
1768                                                                             \
1769   product(bool, CMSEdenChunksRecordAlways, true,                            \
1770           "Always record eden chunks used for the parallel initial mark "   \
1771           "or remark of eden")                                              \
1772                                                                             \
1773   product(bool, CMSConcurrentMTEnabled, true,                               \
1774           "Whether multi-threaded concurrent work enabled "                 \
1775           "(effective only if ParNewGC)")                                   \
1776                                                                             \
1777   product(bool, CMSPrecleaningEnabled, true,                                \
1778           "Whether concurrent precleaning enabled")                         \
1779                                                                             \
1780   product(uintx, CMSPrecleanIter, 3,                                        \
1781           "Maximum number of precleaning iteration passes")                 \
1782           range(0, 9)                                                       \
1783                                                                             \
1784   product(uintx, CMSPrecleanDenominator, 3,                                 \
1785           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1786           "ratio")                                                          \
1787           range(1, max_uintx)                                               \
1788           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1789                                                                             \
1790   product(uintx, CMSPrecleanNumerator, 2,                                   \
1791           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1792           "ratio")                                                          \
1793           range(0, max_uintx-1)                                             \
1794           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1795                                                                             \
1796   product(bool, CMSPrecleanRefLists1, true,                                 \
1797           "Preclean ref lists during (initial) preclean phase")             \
1798                                                                             \
1799   product(bool, CMSPrecleanRefLists2, false,                                \
1800           "Preclean ref lists during abortable preclean phase")             \
1801                                                                             \
1802   product(bool, CMSPrecleanSurvivors1, false,                               \
1803           "Preclean survivors during (initial) preclean phase")             \
1804                                                                             \
1805   product(bool, CMSPrecleanSurvivors2, true,                                \
1806           "Preclean survivors during abortable preclean phase")             \
1807                                                                             \
1808   product(uintx, CMSPrecleanThreshold, 1000,                                \
1809           "Do not iterate again if number of dirty cards is less than this")\
1810           range(100, max_uintx)                                             \
1811                                                                             \
1812   product(bool, CMSCleanOnEnter, true,                                      \
1813           "Clean-on-enter optimization for reducing number of dirty cards") \
1814                                                                             \
1815   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1816           "Choose variant (1,2) of verification following remark")          \
1817           range(1, 2)                                                       \
1818                                                                             \
1819   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1820           "If Eden size is below this, do not try to schedule remark")      \
1821           range(0, max_uintx)                                               \
1822                                                                             \
1823   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1824           "The Eden occupancy percentage (0-100) at which "                 \
1825           "to try and schedule remark pause")                               \
1826           range(0, 100)                                                     \
1827                                                                             \
1828   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1829           "Start sampling eden top at least before young gen "              \
1830           "occupancy reaches 1/<ratio> of the size at which "               \
1831           "we plan to schedule remark")                                     \
1832           range(1, max_uintx)                                               \
1833                                                                             \
1834   product(uintx, CMSSamplingGrain, 16*K,                                    \
1835           "The minimum distance between eden samples for CMS (see above)")  \
1836           range(ObjectAlignmentInBytes, max_uintx)                          \
1837           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1838                                                                             \
1839   product(bool, CMSScavengeBeforeRemark, false,                             \
1840           "Attempt scavenge before the CMS remark step")                    \
1841                                                                             \
1842   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1843           "Don't drain below this size per parallel worker/thief")          \
1844           range(1, max_juint)                                               \
1845           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1846                                                                             \
1847   manageable(intx, CMSWaitDuration, 2000,                                   \
1848           "Time in milliseconds that CMS thread waits for young GC")        \
1849           range(min_jint, max_jint)                                         \
1850                                                                             \
1851   develop(uintx, CMSCheckInterval, 1000,                                    \
1852           "Interval in milliseconds that CMS thread checks if it "          \
1853           "should start a collection cycle")                                \
1854                                                                             \
1855   product(bool, CMSYield, true,                                             \
1856           "Yield between steps of CMS")                                     \
1857                                                                             \
1858   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1859           "Bitmap operations should process at most this many bits "        \
1860           "between yields")                                                 \
1861           range(1, max_uintx)                                               \
1862           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1863                                                                             \
1864   product(bool, CMSPrintChunksInDump, false,                                \
1865           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1866           "trace level include more detailed information about the"         \
1867           "free chunks")                \
1868                                                                             \
1869   product(bool, CMSPrintObjectsInDump, false,                               \
1870           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1871           "trace level include more detailed information about the"         \
1872           "allocated objects")                                              \
1873                                                                             \
1874   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1875           "Verify that all references across the FLS boundary "             \
1876           "are to valid objects")                                           \
1877                                                                             \
1878   diagnostic(bool, FLSVerifyLists, false,                                   \
1879           "Do lots of (expensive) FreeListSpace verification")              \
1880                                                                             \
1881   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1882           "Do lots of (expensive) FLS index table verification")            \
1883                                                                             \
1884   develop(bool, FLSVerifyDictionary, false,                                 \
1885           "Do lots of (expensive) FLS dictionary verification")             \
1886                                                                             \
1887   develop(bool, VerifyBlockOffsetArray, false,                              \
1888           "Do (expensive) block offset array verification")                 \
1889                                                                             \
1890   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1891           "Maintain _unallocated_block in BlockOffsetArray "                \
1892           "(currently applicable only to CMS collector)")                   \
1893                                                                             \
1894   product(intx, RefDiscoveryPolicy, 0,                                      \
1895           "Select type of reference discovery policy: "                     \
1896           "reference-based(0) or referent-based(1)")                        \
1897           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1898                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1899                                                                             \
1900   product(bool, ParallelRefProcEnabled, false,                              \
1901           "Enable parallel reference processing whenever possible")         \
1902                                                                             \
1903   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1904           "Enable balancing of reference processing queues")                \
1905                                                                             \
1906   product(uintx, CMSTriggerRatio, 80,                                       \
1907           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1908           "allocated before a CMS collection cycle commences")              \
1909           range(0, 100)                                                     \
1910                                                                             \
1911   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1912           "Percentage CMS generation occupancy at which to "                \
1913           "initiate CMS collection for bootstrapping collection stats")     \
1914           range(0, 100)                                                     \
1915                                                                             \
1916   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1917           "Percentage CMS generation occupancy to start a CMS collection "  \
1918           "cycle. A negative value means that CMSTriggerRatio is used")     \
1919           range(min_intx, 100)                                              \
1920                                                                             \
1921   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1922           "The percent occupancy (IHOP) of the current old generation "     \
1923           "capacity above which a concurrent mark cycle will be initiated " \
1924           "Its value may change over time if adaptive IHOP is enabled, "    \
1925           "otherwise the value remains constant. "                          \
1926           "In the latter case a value of 0 will result as frequent as "     \
1927           "possible concurrent marking cycles. A value of 100 disables "    \
1928           "concurrent marking. "                                            \
1929           "Fragmentation waste in the old generation is not considered "    \
1930           "free space in this calculation. (G1 collector only)")            \
1931           range(0, 100)                                                     \
1932                                                                             \
1933   manageable(intx, CMSTriggerInterval, -1,                                  \
1934           "Commence a CMS collection cycle (at least) every so many "       \
1935           "milliseconds (0 permanently, -1 disabled)")                      \
1936           range(-1, max_intx)                                               \
1937                                                                             \
1938   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1939           "Only use occupancy as a criterion for starting a CMS collection")\
1940                                                                             \
1941   product(uintx, CMSIsTooFullPercentage, 98,                                \
1942           "An absolute ceiling above which CMS will always consider the "   \
1943           "unloading of classes when class unloading is enabled")           \
1944           range(0, 100)                                                     \
1945                                                                             \
1946   develop(bool, CMSTestInFreeList, false,                                   \
1947           "Check if the coalesced range is already in the "                 \
1948           "free lists as claimed")                                          \
1949                                                                             \
1950   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1951           "Check that all the garbage collected was returned to the "       \
1952           "free lists")                                                     \
1953                                                                             \
1954   notproduct(bool, ScavengeALot, false,                                     \
1955           "Force scavenge at every Nth exit from the runtime system "       \
1956           "(N=ScavengeALotInterval)")                                       \
1957                                                                             \
1958   develop(bool, FullGCALot, false,                                          \
1959           "Force full gc at every Nth exit from the runtime system "        \
1960           "(N=FullGCALotInterval)")                                         \
1961                                                                             \
1962   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1963           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1964                                                                             \
1965   notproduct(bool, PromotionFailureALot, false,                             \
1966           "Use promotion failure handling on every youngest generation "    \
1967           "collection")                                                     \
1968                                                                             \
1969   develop(uintx, PromotionFailureALotCount, 1000,                           \
1970           "Number of promotion failures occurring at PLAB "                 \
1971           "refill attempts (ParNew) or promotion attempts "                 \
1972           "(other young collectors)")                                       \
1973                                                                             \
1974   develop(uintx, PromotionFailureALotInterval, 5,                           \
1975           "Total collections between promotion failures a lot")             \
1976                                                                             \
1977   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1978           "Sleep time when sleep is used for yields")                       \
1979                                                                             \
1980   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1981           "Number of yields before a sleep is done during work stealing")   \
1982                                                                             \
1983   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1984           "Number of iterations in a spin loop between checks on "          \
1985           "time out of hard spin")                                          \
1986                                                                             \
1987   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1988           "Ratio of hard spins to calls to yield")                          \
1989                                                                             \
1990   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1991           "Number of object array elements to push onto the marking stack " \
1992           "before pushing a continuation entry")                            \
1993                                                                             \
1994   develop(bool, MetadataAllocationFailALot, false,                          \
1995           "Fail metadata allocations at intervals controlled by "           \
1996           "MetadataAllocationFailALotInterval")                             \
1997                                                                             \
1998   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1999           "Metadata allocation failure a lot interval")                     \
2000                                                                             \
2001   notproduct(bool, ExecuteInternalVMTests, false,                           \
2002           "Enable execution of internal VM tests")                          \
2003                                                                             \
2004   notproduct(bool, VerboseInternalVMTests, false,                           \
2005           "Turn on logging for internal VM tests.")                         \
2006                                                                             \
2007   product(bool, ExecutingUnitTests, false,                                  \
2008           "Whether the JVM is running unit tests or not")                   \
2009                                                                             \
2010   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2011                                                                             \
2012   product_pd(bool, ResizeTLAB,                                              \
2013           "Dynamically resize TLAB size for threads")                       \
2014                                                                             \
2015   product(bool, ZeroTLAB, false,                                            \
2016           "Zero out the newly created TLAB")                                \
2017                                                                             \
2018   product(bool, FastTLABRefill, true,                                       \
2019           "Use fast TLAB refill code")                                      \
2020                                                                             \
2021   product(bool, TLABStats, true,                                            \
2022           "Provide more detailed and expensive TLAB statistics.")           \
2023                                                                             \
2024   product_pd(bool, NeverActAsServerClassMachine,                            \
2025           "Never act like a server-class machine")                          \
2026                                                                             \
2027   product(bool, AlwaysActAsServerClassMachine, false,                       \
2028           "Always act like a server-class machine")                         \
2029                                                                             \
2030   product_pd(uint64_t, MaxRAM,                                              \
2031           "Real memory size (in bytes) used to set maximum heap size")      \
2032           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2033                                                                             \
2034   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2035           "Maximum ergonomically set heap size (in bytes); zero means use " \
2036           "MaxRAM / MaxRAMFraction")                                        \
2037           range(0, max_uintx)                                               \
2038                                                                             \
2039   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2040           "Use CGroup memory limit as physical memory limit for heap "      \
2041           "sizing")                                                         \
2042                                                                             \
2043   product(uintx, MaxRAMFraction, 4,                                         \
2044           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2045           "size")                                                           \
2046           range(1, max_uintx)                                               \
2047                                                                             \
2048   product(uintx, MinRAMFraction, 2,                                         \
2049           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2050           "size on systems with small physical memory size")                \
2051           range(1, max_uintx)                                               \
2052                                                                             \
2053   product(uintx, InitialRAMFraction, 64,                                    \
2054           "Fraction (1/n) of real memory used for initial heap size")       \
2055           range(1, max_uintx)                                               \
2056                                                                             \
2057   develop(uintx, MaxVirtMemFraction, 2,                                     \
2058           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2059           "determining maximum heap size")                                  \
2060                                                                             \
2061   product(bool, UseAutoGCSelectPolicy, false,                               \
2062           "Use automatic collection selection policy")                      \
2063                                                                             \
2064   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2065           "Automatic GC selection pause threshold in milliseconds")         \
2066           range(0, max_uintx)                                               \
2067                                                                             \
2068   product(bool, UseAdaptiveSizePolicy, true,                                \
2069           "Use adaptive generation sizing policies")                        \
2070                                                                             \
2071   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2072           "Use adaptive survivor sizing policies")                          \
2073                                                                             \
2074   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2075           "Use adaptive young-old sizing policies at minor collections")    \
2076                                                                             \
2077   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2078           "Use adaptive young-old sizing policies at major collections")    \
2079                                                                             \
2080   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2081           "Include statistics from System.gc() for adaptive size policy")   \
2082                                                                             \
2083   product(bool, UseAdaptiveGCBoundary, false,                               \
2084           "Allow young-old boundary to move")                               \
2085                                                                             \
2086   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2087           "Resize the virtual spaces of the young or old generations")      \
2088           range(-1, 1)                                                      \
2089                                                                             \
2090   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2091           "Policy for changing generation size for throughput goals")       \
2092           range(0, 1)                                                       \
2093                                                                             \
2094   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2095           "Number of steps where heuristics is used before data is used")   \
2096           range(0, max_uintx)                                               \
2097                                                                             \
2098   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2099           "Number of collections before the adaptive sizing is started")    \
2100                                                                             \
2101   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2102           "Collection interval for printing information; zero means never") \
2103           range(0, max_uintx)                                               \
2104                                                                             \
2105   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2106           "Use adaptive minimum footprint as a goal")                       \
2107                                                                             \
2108   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2109           "Weight given to exponential resizing, between 0 and 100")        \
2110           range(0, 100)                                                     \
2111                                                                             \
2112   product(uintx, AdaptiveTimeWeight,       25,                              \
2113           "Weight given to time in adaptive policy, between 0 and 100")     \
2114           range(0, 100)                                                     \
2115                                                                             \
2116   product(uintx, PausePadding, 1,                                           \
2117           "How much buffer to keep for pause time")                         \
2118           range(0, max_juint)                                               \
2119                                                                             \
2120   product(uintx, PromotedPadding, 3,                                        \
2121           "How much buffer to keep for promotion failure")                  \
2122           range(0, max_juint)                                               \
2123                                                                             \
2124   product(uintx, SurvivorPadding, 3,                                        \
2125           "How much buffer to keep for survivor overflow")                  \
2126           range(0, max_juint)                                               \
2127                                                                             \
2128   product(uintx, ThresholdTolerance, 10,                                    \
2129           "Allowed collection cost difference between generations")         \
2130           range(0, 100)                                                     \
2131                                                                             \
2132   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2133           "If collection costs are within margin, reduce both by full "     \
2134           "delta")                                                          \
2135           range(0, 100)                                                     \
2136                                                                             \
2137   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2138           "Adaptive size percentage change in young generation")            \
2139           range(0, 100)                                                     \
2140                                                                             \
2141   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2142           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2143           range(0, 100)                                                     \
2144                                                                             \
2145   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2146           "Decay factor to YoungedGenerationSizeSupplement")                \
2147           range(1, max_uintx)                                               \
2148                                                                             \
2149   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2150           "Adaptive size percentage change in tenured generation")          \
2151           range(0, 100)                                                     \
2152                                                                             \
2153   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2154           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2155           range(0, 100)                                                     \
2156                                                                             \
2157   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2158           "Decay factor to TenuredGenerationSizeIncrement")                 \
2159           range(1, max_uintx)                                               \
2160                                                                             \
2161   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2162           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2163           "or (G1 Only) the maximum GC time per MMU time slice")            \
2164           range(1, max_uintx - 1)                                           \
2165           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2166                                                                             \
2167   product(uintx, GCPauseIntervalMillis, 0,                                  \
2168           "Time slice for MMU specification")                               \
2169           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2170                                                                             \
2171   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2172           "Adaptive size policy maximum GC minor pause time goal "          \
2173           "in millisecond")                                                 \
2174           range(0, max_uintx)                                               \
2175                                                                             \
2176   product(uintx, GCTimeRatio, 99,                                           \
2177           "Adaptive size policy application time to GC time ratio")         \
2178           range(0, max_juint)                                               \
2179                                                                             \
2180   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2181           "Adaptive size scale down factor for shrinking")                  \
2182           range(1, max_uintx)                                               \
2183                                                                             \
2184   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2185           "Adaptive size decays the major cost for long major intervals")   \
2186                                                                             \
2187   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2188           "Time scale over which major costs decay")                        \
2189           range(0, max_uintx)                                               \
2190                                                                             \
2191   product(uintx, MinSurvivorRatio, 3,                                       \
2192           "Minimum ratio of young generation/survivor space size")          \
2193           range(3, max_uintx)                                               \
2194                                                                             \
2195   product(uintx, InitialSurvivorRatio, 8,                                   \
2196           "Initial ratio of young generation/survivor space size")          \
2197           range(0, max_uintx)                                               \
2198                                                                             \
2199   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2200           "Estimate of footprint other than Java Heap")                     \
2201           range(0, max_uintx)                                               \
2202                                                                             \
2203   product(bool, UseGCOverheadLimit, true,                                   \
2204           "Use policy to limit of proportion of time spent in GC "          \
2205           "before an OutOfMemory error is thrown")                          \
2206                                                                             \
2207   product(uintx, GCTimeLimit, 98,                                           \
2208           "Limit of the proportion of time spent in GC before "             \
2209           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2210           range(0, 100)                                                     \
2211                                                                             \
2212   product(uintx, GCHeapFreeLimit, 2,                                        \
2213           "Minimum percentage of free space after a full GC before an "     \
2214           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2215           range(0, 100)                                                     \
2216                                                                             \
2217   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2218           "Number of consecutive collections before gc time limit fires")   \
2219           range(1, max_uintx)                                               \
2220                                                                             \
2221   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2222           "How far ahead to prefetch destination area (<= 0 means off)")    \
2223           range(-1, max_jint)                                               \
2224                                                                             \
2225   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2226           "How far ahead to prefetch scan area (<= 0 means off)")           \
2227           range(-1, max_jint)                                               \
2228                                                                             \
2229   product(intx, PrefetchFieldsAhead, -1,                                    \
2230           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2231           range(-1, max_jint)                                               \
2232                                                                             \
2233   diagnostic(bool, VerifyDuringStartup, false,                              \
2234           "Verify memory system before executing any Java code "            \
2235           "during VM initialization")                                       \
2236                                                                             \
2237   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2238           "Verify system before exiting")                                   \
2239                                                                             \
2240   diagnostic(bool, VerifyBeforeGC, false,                                   \
2241           "Verify memory system before GC")                                 \
2242                                                                             \
2243   diagnostic(bool, VerifyAfterGC, false,                                    \
2244           "Verify memory system after GC")                                  \
2245                                                                             \
2246   diagnostic(bool, VerifyDuringGC, false,                                   \
2247           "Verify memory system during GC (between phases)")                \
2248                                                                             \
2249   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2250           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2251           "are enabled. One or more sub-systems can be specified "          \
2252           "in a comma separated string. Sub-systems are: "                  \
2253           "threads, heap, symbol_table, string_table, codecache, "          \
2254           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2255           "codecache_oops")                                                 \
2256                                                                             \
2257   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2258           "Enable parallel memory system verification")                     \
2259                                                                             \
2260   diagnostic(bool, DeferInitialCardMark, false,                             \
2261           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2262           "may arise from new_pre_store_barrier")                           \
2263                                                                             \
2264   product(bool, UseCondCardMark, false,                                     \
2265           "Check for already marked card before updating card table")       \
2266                                                                             \
2267   diagnostic(bool, VerifyRememberedSets, false,                             \
2268           "Verify GC remembered sets")                                      \
2269                                                                             \
2270   diagnostic(bool, VerifyObjectStartArray, true,                            \
2271           "Verify GC object start array if verify before/after")            \
2272                                                                             \
2273   product(bool, DisableExplicitGC, false,                                   \
2274           "Ignore calls to System.gc()")                                    \
2275                                                                             \
2276   notproduct(bool, CheckMemoryInitialization, false,                        \
2277           "Check memory initialization")                                    \
2278                                                                             \
2279   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2280           "Bind CMS Thread to CPU if possible")                             \
2281                                                                             \
2282   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2283           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2284           range(0, max_juint)                                               \
2285                                                                             \
2286   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2287           "Bind GCTaskThreads to CPUs if possible")                         \
2288                                                                             \
2289   product(bool, UseGCTaskAffinity, false,                                   \
2290           "Use worker affinity when asking for GCTasks")                    \
2291                                                                             \
2292   product(uintx, ProcessDistributionStride, 4,                              \
2293           "Stride through processors when distributing processes")          \
2294           range(0, max_juint)                                               \
2295                                                                             \
2296   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2297           "Number of times the coordinator GC thread will sleep while "     \
2298           "yielding before giving up and resuming GC")                      \
2299           range(0, max_juint)                                               \
2300                                                                             \
2301   product(uintx, CMSYieldSleepCount, 0,                                     \
2302           "Number of times a GC thread (minus the coordinator) "            \
2303           "will sleep while yielding before giving up and resuming GC")     \
2304           range(0, max_juint)                                               \
2305                                                                             \
2306   product(bool, PrintGC, false,                                             \
2307           "Print message at garbage collection. "                           \
2308           "Deprecated, use -Xlog:gc instead.")                              \
2309                                                                             \
2310   product(bool, PrintGCDetails, false,                                      \
2311           "Print more details at garbage collection. "                      \
2312           "Deprecated, use -Xlog:gc* instead.")                             \
2313                                                                             \
2314   develop(intx, ConcGCYieldTimeout, 0,                                      \
2315           "If non-zero, assert that GC threads yield within this "          \
2316           "number of milliseconds")                                         \
2317           range(0, max_intx)                                                \
2318                                                                             \
2319   develop(bool, TraceFinalizerRegistration, false,                          \
2320           "Trace registration of final references")                         \
2321                                                                             \
2322   notproduct(bool, TraceScavenge, false,                                    \
2323           "Trace scavenge")                                                 \
2324                                                                             \
2325   product(bool, IgnoreEmptyClassPaths, false,                               \
2326           "Ignore empty path elements in -classpath")                       \
2327                                                                             \
2328   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2329           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2330           "Initial size of the boot class loader data metaspace")           \
2331           range(30*K, max_uintx/BytesPerWord)                               \
2332           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2333                                                                             \
2334   product(bool, TraceYoungGenTime, false,                                   \
2335           "Trace accumulated time for young collection")                    \
2336                                                                             \
2337   product(bool, TraceOldGenTime, false,                                     \
2338           "Trace accumulated time for old collection")                      \
2339                                                                             \
2340   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2341           "Print heap layout in response to SIGBREAK")                      \
2342                                                                             \
2343   manageable(bool, PrintClassHistogram, false,                              \
2344           "Print a histogram of class instances")                           \
2345                                                                             \
2346   develop(bool, TraceGCTaskManager, false,                                  \
2347           "Trace actions of the GC task manager")                           \
2348                                                                             \
2349   develop(bool, TraceGCTaskQueue, false,                                    \
2350           "Trace actions of the GC task queues")                            \
2351                                                                             \
2352   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2353           "Trace marking phase in ParallelOldGC")                           \
2354                                                                             \
2355   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2356           "Trace dense prefix computation for ParallelOldGC")               \
2357                                                                             \
2358   develop(bool, IgnoreLibthreadGPFault, false,                              \
2359           "Suppress workaround for libthread GP fault")                     \
2360                                                                             \
2361   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2362           "The percentage of the used heap that the instances of a class "  \
2363           "must occupy for the class to generate a trace event")            \
2364           range(0.0, 100.0)                                                 \
2365                                                                             \
2366   /* JVMTI heap profiling */                                                \
2367                                                                             \
2368   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2369           "Trace JVMTI object tagging calls")                               \
2370                                                                             \
2371   diagnostic(bool, VerifyBeforeIteration, false,                            \
2372           "Verify memory system before JVMTI iteration")                    \
2373                                                                             \
2374   /* compiler interface */                                                  \
2375                                                                             \
2376   develop(bool, CIPrintCompilerName, false,                                 \
2377           "when CIPrint is active, print the name of the active compiler")  \
2378                                                                             \
2379   diagnostic(bool, CIPrintCompileQueue, false,                              \
2380           "display the contents of the compile queue whenever a "           \
2381           "compilation is enqueued")                                        \
2382                                                                             \
2383   develop(bool, CIPrintRequests, false,                                     \
2384           "display every request for compilation")                          \
2385                                                                             \
2386   product(bool, CITime, false,                                              \
2387           "collect timing information for compilation")                     \
2388                                                                             \
2389   develop(bool, CITimeVerbose, false,                                       \
2390           "be more verbose in compilation timings")                         \
2391                                                                             \
2392   develop(bool, CITimeEach, false,                                          \
2393           "display timing information after each successful compilation")   \
2394                                                                             \
2395   develop(bool, CICountOSR, false,                                          \
2396           "use a separate counter when assigning ids to osr compilations")  \
2397                                                                             \
2398   develop(bool, CICompileNatives, true,                                     \
2399           "compile native methods if supported by the compiler")            \
2400                                                                             \
2401   develop_pd(bool, CICompileOSR,                                            \
2402           "compile on stack replacement methods if supported by the "       \
2403           "compiler")                                                       \
2404                                                                             \
2405   develop(bool, CIPrintMethodCodes, false,                                  \
2406           "print method bytecodes of the compiled code")                    \
2407                                                                             \
2408   develop(bool, CIPrintTypeFlow, false,                                     \
2409           "print the results of ciTypeFlow analysis")                       \
2410                                                                             \
2411   develop(bool, CITraceTypeFlow, false,                                     \
2412           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2413                                                                             \
2414   develop(intx, OSROnlyBCI, -1,                                             \
2415           "OSR only at this bci.  Negative values mean exclude that bci")   \
2416                                                                             \
2417   /* compiler */                                                            \
2418                                                                             \
2419   /* notice: the max range value here is max_jint, not max_intx  */         \
2420   /* because of overflow issue                                   */         \
2421   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2422           "Number of compiler threads to run")                              \
2423           range(0, max_jint)                                                \
2424           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2425                                                                             \
2426   product(intx, CompilationPolicyChoice, 0,                                 \
2427           "which compilation policy (0-3)")                                 \
2428           range(0, 3)                                                       \
2429                                                                             \
2430   develop(bool, UseStackBanging, true,                                      \
2431           "use stack banging for stack overflow checks (required for "      \
2432           "proper StackOverflow handling; disable only to measure cost "    \
2433           "of stackbanging)")                                               \
2434                                                                             \
2435   develop(bool, UseStrictFP, true,                                          \
2436           "use strict fp if modifier strictfp is set")                      \
2437                                                                             \
2438   develop(bool, GenerateSynchronizationCode, true,                          \
2439           "generate locking/unlocking code for synchronized methods and "   \
2440           "monitors")                                                       \
2441                                                                             \
2442   develop(bool, GenerateRangeChecks, true,                                  \
2443           "Generate range checks for array accesses")                       \
2444                                                                             \
2445   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2446           "Generate code for implicit null checks")                         \
2447                                                                             \
2448   product_pd(bool, TrapBasedNullChecks,                                     \
2449           "Generate code for null checks that uses a cmp and trap "         \
2450           "instruction raising SIGTRAP.  This is only used if an access to" \
2451           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2452           "ImplicitNullChecks don't work (PPC64).")                         \
2453                                                                             \
2454   product(bool, PrintSafepointStatistics, false,                            \
2455           "Print statistics about safepoint synchronization")               \
2456                                                                             \
2457   product(intx, PrintSafepointStatisticsCount, 300,                         \
2458           "Total number of safepoint statistics collected "                 \
2459           "before printing them out")                                       \
2460           range(1, max_intx)                                                \
2461                                                                             \
2462   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2463           "Print safepoint statistics only when safepoint takes "           \
2464           "more than PrintSafepointSatisticsTimeout in millis")             \
2465   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2466   NOT_LP64(range(-1, max_intx))                                             \
2467                                                                             \
2468   product(bool, Inline, true,                                               \
2469           "Enable inlining")                                                \
2470                                                                             \
2471   product(bool, ClipInlining, true,                                         \
2472           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2473                                                                             \
2474   develop(bool, UseCHA, true,                                               \
2475           "Enable CHA")                                                     \
2476                                                                             \
2477   product(bool, UseTypeProfile, true,                                       \
2478           "Check interpreter profile for historically monomorphic calls")   \
2479                                                                             \
2480   diagnostic(bool, PrintInlining, false,                                    \
2481           "Print inlining optimizations")                                   \
2482                                                                             \
2483   product(bool, UsePopCountInstruction, false,                              \
2484           "Use population count instruction")                               \
2485                                                                             \
2486   develop(bool, EagerInitialization, false,                                 \
2487           "Eagerly initialize classes if possible")                         \
2488                                                                             \
2489   diagnostic(bool, LogTouchedMethods, false,                                \
2490           "Log methods which have been ever touched in runtime")            \
2491                                                                             \
2492   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2493           "Print all methods that have been ever touched in runtime")       \
2494                                                                             \
2495   develop(bool, TraceMethodReplacement, false,                              \
2496           "Print when methods are replaced do to recompilation")            \
2497                                                                             \
2498   develop(bool, PrintMethodFlushing, false,                                 \
2499           "Print the nmethods being flushed")                               \
2500                                                                             \
2501   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2502           "print statistics about method flushing")                         \
2503                                                                             \
2504   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2505           "Number of compiled code invocations after which "                \
2506           "the method is considered as hot by the flusher")                 \
2507           range(1, max_jint)                                                \
2508                                                                             \
2509   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2510           "Minimum number of sweeper passes before an nmethod "             \
2511           "can be flushed")                                                 \
2512           range(0, max_intx)                                                \
2513                                                                             \
2514   product(bool, UseCodeAging, true,                                         \
2515           "Insert counter to detect warm methods")                          \
2516                                                                             \
2517   diagnostic(bool, StressCodeAging, false,                                  \
2518           "Start with counters compiled in")                                \
2519                                                                             \
2520   develop(bool, UseRelocIndex, false,                                       \
2521           "Use an index to speed random access to relocations")             \
2522                                                                             \
2523   develop(bool, StressCodeBuffers, false,                                   \
2524           "Exercise code buffer expansion and other rare state changes")    \
2525                                                                             \
2526   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2527           "Generate extra debugging information for non-safepoints in "     \
2528           "nmethods")                                                       \
2529                                                                             \
2530   product(bool, PrintVMOptions, false,                                      \
2531           "Print flags that appeared on the command line")                  \
2532                                                                             \
2533   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2534           "Ignore unrecognized VM options")                                 \
2535                                                                             \
2536   product(bool, PrintCommandLineFlags, false,                               \
2537           "Print flags specified on command line or set by ergonomics")     \
2538                                                                             \
2539   product(bool, PrintFlagsInitial, false,                                   \
2540           "Print all VM flags before argument processing and exit VM")      \
2541                                                                             \
2542   product(bool, PrintFlagsFinal, false,                                     \
2543           "Print all VM flags after argument and ergonomic processing")     \
2544                                                                             \
2545   notproduct(bool, PrintFlagsWithComments, false,                           \
2546           "Print all VM flags with default values and descriptions and "    \
2547           "exit")                                                           \
2548                                                                             \
2549   product(bool, PrintFlagsRanges, false,                                    \
2550           "Print VM flags and their ranges and exit VM")                    \
2551                                                                             \
2552   diagnostic(bool, SerializeVMOutput, true,                                 \
2553           "Use a mutex to serialize output to tty and LogFile")             \
2554                                                                             \
2555   diagnostic(bool, DisplayVMOutput, true,                                   \
2556           "Display all VM output on the tty, independently of LogVMOutput") \
2557                                                                             \
2558   diagnostic(bool, LogVMOutput, false,                                      \
2559           "Save VM output to LogFile")                                      \
2560                                                                             \
2561   diagnostic(ccstr, LogFile, NULL,                                          \
2562           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2563           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2564                                                                             \
2565   product(ccstr, ErrorFile, NULL,                                           \
2566           "If an error occurs, save the error data to this file "           \
2567           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2568                                                                             \
2569   product(bool, DisplayVMOutputToStderr, false,                             \
2570           "If DisplayVMOutput is true, display all VM output to stderr")    \
2571                                                                             \
2572   product(bool, DisplayVMOutputToStdout, false,                             \
2573           "If DisplayVMOutput is true, display all VM output to stdout")    \
2574                                                                             \
2575   product(bool, UseHeavyMonitors, false,                                    \
2576           "use heavyweight instead of lightweight Java monitors")           \
2577                                                                             \
2578   product(bool, PrintStringTableStatistics, false,                          \
2579           "print statistics about the StringTable and SymbolTable")         \
2580                                                                             \
2581   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2582           "verify StringTable contents at exit")                            \
2583                                                                             \
2584   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2585           "print histogram of the symbol table")                            \
2586                                                                             \
2587   notproduct(bool, ExitVMOnVerifyError, false,                              \
2588           "standard exit from VM if bytecode verify error "                 \
2589           "(only in debug mode)")                                           \
2590                                                                             \
2591   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2592           "Call fatal if this exception is thrown.  Example: "              \
2593           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2594                                                                             \
2595   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2596           "Call fatal if the exception pointed by AbortVMOnException "      \
2597           "has this message")                                               \
2598                                                                             \
2599   develop(bool, DebugVtables, false,                                        \
2600           "add debugging code to vtable dispatch")                          \
2601                                                                             \
2602   notproduct(bool, PrintVtableStats, false,                                 \
2603           "print vtables stats at end of run")                              \
2604                                                                             \
2605   develop(bool, TraceCreateZombies, false,                                  \
2606           "trace creation of zombie nmethods")                              \
2607                                                                             \
2608   notproduct(bool, IgnoreLockingAssertions, false,                          \
2609           "disable locking assertions (for speed)")                         \
2610                                                                             \
2611   product(bool, RangeCheckElimination, true,                                \
2612           "Eliminate range checks")                                         \
2613                                                                             \
2614   develop_pd(bool, UncommonNullCast,                                        \
2615           "track occurrences of null in casts; adjust compiler tactics")    \
2616                                                                             \
2617   develop(bool, TypeProfileCasts,  true,                                    \
2618           "treat casts like calls for purposes of type profiling")          \
2619                                                                             \
2620   develop(bool, DelayCompilationDuringStartup, true,                        \
2621           "Delay invoking the compiler until main application class is "    \
2622           "loaded")                                                         \
2623                                                                             \
2624   develop(bool, CompileTheWorld, false,                                     \
2625           "Compile all methods in all classes in bootstrap class path "     \
2626             "(stress test)")                                                \
2627                                                                             \
2628   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2629           "Preload all classes used by a class before start loading")       \
2630                                                                             \
2631   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2632           "Force a safepoint every n compiles so sweeper can keep up")      \
2633                                                                             \
2634   develop(bool, FillDelaySlots, true,                                       \
2635           "Fill delay slots (on SPARC only)")                               \
2636                                                                             \
2637   develop(bool, TimeLivenessAnalysis, false,                                \
2638           "Time computation of bytecode liveness analysis")                 \
2639                                                                             \
2640   develop(bool, TraceLivenessGen, false,                                    \
2641           "Trace the generation of liveness analysis information")          \
2642                                                                             \
2643   notproduct(bool, TraceLivenessQuery, false,                               \
2644           "Trace queries of liveness analysis information")                 \
2645                                                                             \
2646   notproduct(bool, CollectIndexSetStatistics, false,                        \
2647           "Collect information about IndexSets")                            \
2648                                                                             \
2649   develop(bool, UseLoopSafepoints, true,                                    \
2650           "Generate Safepoint nodes in every loop")                         \
2651                                                                             \
2652   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2653           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2654           "Inline allocations larger than this in doublewords must go slow")\
2655                                                                             \
2656   product(bool, AggressiveOpts, false,                                      \
2657           "Enable aggressive optimizations - see arguments.cpp")            \
2658                                                                             \
2659   product_pd(bool, CompactStrings,                                          \
2660           "Enable Strings to use single byte chars in backing store")       \
2661                                                                             \
2662   product_pd(uintx, TypeProfileLevel,                                       \
2663           "=XYZ, with Z: Type profiling of arguments at call; "             \
2664                      "Y: Type profiling of return value at call; "          \
2665                      "X: Type profiling of parameters to methods; "         \
2666           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2667           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2668                                                                             \
2669   product(intx, TypeProfileArgsLimit,     2,                                \
2670           "max number of call arguments to consider for type profiling")    \
2671           range(0, 16)                                                      \
2672                                                                             \
2673   product(intx, TypeProfileParmsLimit,    2,                                \
2674           "max number of incoming parameters to consider for type profiling"\
2675           ", -1 for all")                                                   \
2676           range(-1, 64)                                                     \
2677                                                                             \
2678   /* statistics */                                                          \
2679   develop(bool, CountCompiledCalls, false,                                  \
2680           "Count method invocations")                                       \
2681                                                                             \
2682   notproduct(bool, CountRuntimeCalls, false,                                \
2683           "Count VM runtime calls")                                         \
2684                                                                             \
2685   develop(bool, CountJNICalls, false,                                       \
2686           "Count jni method invocations")                                   \
2687                                                                             \
2688   notproduct(bool, CountJVMCalls, false,                                    \
2689           "Count jvm method invocations")                                   \
2690                                                                             \
2691   notproduct(bool, CountRemovableExceptions, false,                         \
2692           "Count exceptions that could be replaced by branches due to "     \
2693           "inlining")                                                       \
2694                                                                             \
2695   notproduct(bool, ICMissHistogram, false,                                  \
2696           "Produce histogram of IC misses")                                 \
2697                                                                             \
2698   /* interpreter */                                                         \
2699   product_pd(bool, RewriteBytecodes,                                        \
2700           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2701                                                                             \
2702   product_pd(bool, RewriteFrequentPairs,                                    \
2703           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2704                                                                             \
2705   diagnostic(bool, PrintInterpreter, false,                                 \
2706           "Print the generated interpreter code")                           \
2707                                                                             \
2708   product(bool, UseInterpreter, true,                                       \
2709           "Use interpreter for non-compiled methods")                       \
2710                                                                             \
2711   develop(bool, UseFastSignatureHandlers, true,                             \
2712           "Use fast signature handlers for native calls")                   \
2713                                                                             \
2714   product(bool, UseLoopCounter, true,                                       \
2715           "Increment invocation counter on backward branch")                \
2716                                                                             \
2717   product_pd(bool, UseOnStackReplacement,                                   \
2718           "Use on stack replacement, calls runtime if invoc. counter "      \
2719           "overflows in loop")                                              \
2720                                                                             \
2721   notproduct(bool, TraceOnStackReplacement, false,                          \
2722           "Trace on stack replacement")                                     \
2723                                                                             \
2724   product_pd(bool, PreferInterpreterNativeStubs,                            \
2725           "Use always interpreter stubs for native methods invoked via "    \
2726           "interpreter")                                                    \
2727                                                                             \
2728   develop(bool, CountBytecodes, false,                                      \
2729           "Count number of bytecodes executed")                             \
2730                                                                             \
2731   develop(bool, PrintBytecodeHistogram, false,                              \
2732           "Print histogram of the executed bytecodes")                      \
2733                                                                             \
2734   develop(bool, PrintBytecodePairHistogram, false,                          \
2735           "Print histogram of the executed bytecode pairs")                 \
2736                                                                             \
2737   diagnostic(bool, PrintSignatureHandlers, false,                           \
2738           "Print code generated for native method signature handlers")      \
2739                                                                             \
2740   develop(bool, VerifyOops, false,                                          \
2741           "Do plausibility checks for oops")                                \
2742                                                                             \
2743   develop(bool, CheckUnhandledOops, false,                                  \
2744           "Check for unhandled oops in VM code")                            \
2745                                                                             \
2746   develop(bool, VerifyJNIFields, trueInDebug,                               \
2747           "Verify jfieldIDs for instance fields")                           \
2748                                                                             \
2749   notproduct(bool, VerifyJNIEnvThread, false,                               \
2750           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2751           "from JNI")                                                       \
2752                                                                             \
2753   develop(bool, VerifyFPU, false,                                           \
2754           "Verify FPU state (check for NaN's, etc.)")                       \
2755                                                                             \
2756   develop(bool, VerifyThread, false,                                        \
2757           "Watch the thread register for corruption (SPARC only)")          \
2758                                                                             \
2759   develop(bool, VerifyActivationFrameSize, false,                           \
2760           "Verify that activation frame didn't become smaller than its "    \
2761           "minimal size")                                                   \
2762                                                                             \
2763   develop(bool, TraceFrequencyInlining, false,                              \
2764           "Trace frequency based inlining")                                 \
2765                                                                             \
2766   develop_pd(bool, InlineIntrinsics,                                        \
2767           "Inline intrinsics that can be statically resolved")              \
2768                                                                             \
2769   product_pd(bool, ProfileInterpreter,                                      \
2770           "Profile at the bytecode level during interpretation")            \
2771                                                                             \
2772   develop(bool, TraceProfileInterpreter, false,                             \
2773           "Trace profiling at the bytecode level during interpretation. "   \
2774           "This outputs the profiling information collected to improve "    \
2775           "jit compilation.")                                               \
2776                                                                             \
2777   develop_pd(bool, ProfileTraps,                                            \
2778           "Profile deoptimization traps at the bytecode level")             \
2779                                                                             \
2780   product(intx, ProfileMaturityPercentage, 20,                              \
2781           "number of method invocations/branches (expressed as % of "       \
2782           "CompileThreshold) before using the method's profile")            \
2783           range(0, 100)                                                     \
2784                                                                             \
2785   diagnostic(bool, PrintMethodData, false,                                  \
2786           "Print the results of +ProfileInterpreter at end of run")         \
2787                                                                             \
2788   develop(bool, VerifyDataPointer, trueInDebug,                             \
2789           "Verify the method data pointer during interpreter profiling")    \
2790                                                                             \
2791   develop(bool, VerifyCompiledCode, false,                                  \
2792           "Include miscellaneous runtime verifications in nmethod code; "   \
2793           "default off because it disturbs nmethod size heuristics")        \
2794                                                                             \
2795   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2796           "Manually make GC thread crash then dump java stack trace;  "     \
2797           "Test only")                                                      \
2798                                                                             \
2799   /* compilation */                                                         \
2800   product(bool, UseCompiler, true,                                          \
2801           "Use Just-In-Time compilation")                                   \
2802                                                                             \
2803   develop(bool, TraceCompilationPolicy, false,                              \
2804           "Trace compilation policy")                                       \
2805                                                                             \
2806   develop(bool, TimeCompilationPolicy, false,                               \
2807           "Time the compilation policy")                                    \
2808                                                                             \
2809   product(bool, UseCounterDecay, true,                                      \
2810           "Adjust recompilation counters")                                  \
2811                                                                             \
2812   develop(intx, CounterHalfLifeTime,    30,                                 \
2813           "Half-life time of invocation counters (in seconds)")             \
2814                                                                             \
2815   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2816           "The minimum interval (in milliseconds) between invocation of "   \
2817           "CounterDecay")                                                   \
2818                                                                             \
2819   product(bool, AlwaysCompileLoopMethods, false,                            \
2820           "When using recompilation, never interpret methods "              \
2821           "containing loops")                                               \
2822                                                                             \
2823   product(bool, DontCompileHugeMethods, true,                               \
2824           "Do not compile methods > HugeMethodLimit")                       \
2825                                                                             \
2826   /* Bytecode escape analysis estimation. */                                \
2827   product(bool, EstimateArgEscape, true,                                    \
2828           "Analyze bytecodes to estimate escape state of arguments")        \
2829                                                                             \
2830   product(intx, BCEATraceLevel, 0,                                          \
2831           "How much tracing to do of bytecode escape analysis estimates "   \
2832           "(0-3)")                                                          \
2833           range(0, 3)                                                       \
2834                                                                             \
2835   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2836           "Maximum number of nested calls that are analyzed by BC EA")      \
2837           range(0, max_jint)                                                \
2838                                                                             \
2839   product(intx, MaxBCEAEstimateSize, 150,                                   \
2840           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2841           range(0, max_jint)                                                \
2842                                                                             \
2843   product(intx,  AllocatePrefetchStyle, 1,                                  \
2844           "0 = no prefetch, "                                               \
2845           "1 = generate prefetch instructions for each allocation, "        \
2846           "2 = use TLAB watermark to gate allocation prefetch, "            \
2847           "3 = generate one prefetch instruction per cache line")           \
2848           range(0, 3)                                                       \
2849                                                                             \
2850   product(intx,  AllocatePrefetchDistance, -1,                              \
2851           "Distance to prefetch ahead of allocation pointer. "              \
2852           "-1: use system-specific value (automatically determined")        \
2853           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2854                                                                             \
2855   product(intx,  AllocatePrefetchLines, 3,                                  \
2856           "Number of lines to prefetch ahead of array allocation pointer")  \
2857           range(1, 64)                                                      \
2858                                                                             \
2859   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2860           "Number of lines to prefetch ahead of instance allocation "       \
2861           "pointer")                                                        \
2862           range(1, 64)                                                      \
2863                                                                             \
2864   product(intx,  AllocatePrefetchStepSize, 16,                              \
2865           "Step size in bytes of sequential prefetch instructions")         \
2866           range(1, 512)                                                     \
2867           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2868                                                                             \
2869   product(intx,  AllocatePrefetchInstr, 0,                                  \
2870           "Select instruction to prefetch ahead of allocation pointer")     \
2871           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2872                                                                             \
2873   /* deoptimization */                                                      \
2874   develop(bool, TraceDeoptimization, false,                                 \
2875           "Trace deoptimization")                                           \
2876                                                                             \
2877   develop(bool, PrintDeoptimizationDetails, false,                          \
2878           "Print more information about deoptimization")                    \
2879                                                                             \
2880   develop(bool, DebugDeoptimization, false,                                 \
2881           "Tracing various information while debugging deoptimization")     \
2882                                                                             \
2883   product(intx, SelfDestructTimer, 0,                                       \
2884           "Will cause VM to terminate after a given time (in minutes) "     \
2885           "(0 means off)")                                                  \
2886           range(0, max_intx)                                                \
2887                                                                             \
2888   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2889           "The maximum number of lines in the stack trace for Java "        \
2890           "exceptions (0 means all)")                                       \
2891           range(0, max_jint/2)                                              \
2892                                                                             \
2893   /* notice: the max range value here is max_jint, not max_intx  */         \
2894   /* because of overflow issue                                   */         \
2895   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2896           "Guarantee a safepoint (at least) every so many milliseconds "    \
2897           "(0 means none)")                                                 \
2898           range(0, max_jint)                                                \
2899                                                                             \
2900   product(intx, SafepointTimeoutDelay, 10000,                               \
2901           "Delay in milliseconds for option SafepointTimeout")              \
2902   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2903   NOT_LP64(range(0, max_intx))                                              \
2904                                                                             \
2905   product(intx, NmethodSweepActivity, 10,                                   \
2906           "Removes cold nmethods from code cache if > 0. Higher values "    \
2907           "result in more aggressive sweeping")                             \
2908           range(0, 2000)                                                    \
2909                                                                             \
2910   notproduct(bool, LogSweeper, false,                                       \
2911           "Keep a ring buffer of sweeper activity")                         \
2912                                                                             \
2913   notproduct(intx, SweeperLogEntries, 1024,                                 \
2914           "Number of records in the ring buffer of sweeper activity")       \
2915                                                                             \
2916   notproduct(intx, MemProfilingInterval, 500,                               \
2917           "Time between each invocation of the MemProfiler")                \
2918                                                                             \
2919   develop(intx, MallocCatchPtr, -1,                                         \
2920           "Hit breakpoint when mallocing/freeing this pointer")             \
2921                                                                             \
2922   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2923           "List of assertions (file:line) to muzzle")                       \
2924                                                                             \
2925   develop(intx, StackPrintLimit, 100,                                       \
2926           "number of stack frames to print in VM-level stack dump")         \
2927                                                                             \
2928   notproduct(intx, MaxElementPrintSize, 256,                                \
2929           "maximum number of elements to print")                            \
2930                                                                             \
2931   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2932           "maximum number of subklasses to print when printing klass")      \
2933                                                                             \
2934   product(intx, MaxInlineLevel, 9,                                          \
2935           "maximum number of nested calls that are inlined")                \
2936           range(0, max_jint)                                                \
2937                                                                             \
2938   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2939           "maximum number of nested recursive calls that are inlined")      \
2940           range(0, max_jint)                                                \
2941                                                                             \
2942   develop(intx, MaxForceInlineLevel, 100,                                   \
2943           "maximum number of nested calls that are forced for inlining "    \
2944           "(using CompileCommand or marked w/ @ForceInline)")               \
2945           range(0, max_jint)                                                \
2946                                                                             \
2947   product_pd(intx, InlineSmallCode,                                         \
2948           "Only inline already compiled methods if their code size is "     \
2949           "less than this")                                                 \
2950           range(0, max_jint)                                                \
2951                                                                             \
2952   product(intx, MaxInlineSize, 35,                                          \
2953           "The maximum bytecode size of a method to be inlined")            \
2954           range(0, max_jint)                                                \
2955                                                                             \
2956   product_pd(intx, FreqInlineSize,                                          \
2957           "The maximum bytecode size of a frequent method to be inlined")   \
2958           range(0, max_jint)                                                \
2959                                                                             \
2960   product(intx, MaxTrivialSize, 6,                                          \
2961           "The maximum bytecode size of a trivial method to be inlined")    \
2962           range(0, max_jint)                                                \
2963                                                                             \
2964   product(intx, MinInliningThreshold, 250,                                  \
2965           "The minimum invocation count a method needs to have to be "      \
2966           "inlined")                                                        \
2967           range(0, max_jint)                                                \
2968                                                                             \
2969   develop(intx, MethodHistogramCutoff, 100,                                 \
2970           "The cutoff value for method invocation histogram (+CountCalls)") \
2971                                                                             \
2972   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2973           "Number of interpreted methods to show in profile")               \
2974                                                                             \
2975   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2976           "Number of compiled methods to show in profile")                  \
2977                                                                             \
2978   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2979           "Number of stub methods to show in profile")                      \
2980                                                                             \
2981   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2982           "Number of runtime stub nodes to show in profile")                \
2983                                                                             \
2984   product(intx, ProfileIntervalsTicks, 100,                                 \
2985           "Number of ticks between printing of interval profile "           \
2986           "(+ProfileIntervals)")                                            \
2987           range(0, max_intx)                                                \
2988                                                                             \
2989   notproduct(intx, ScavengeALotInterval,     1,                             \
2990           "Interval between which scavenge will occur with +ScavengeALot")  \
2991                                                                             \
2992   notproduct(intx, FullGCALotInterval,     1,                               \
2993           "Interval between which full gc will occur with +FullGCALot")     \
2994                                                                             \
2995   notproduct(intx, FullGCALotStart,     0,                                  \
2996           "For which invocation to start FullGCAlot")                       \
2997                                                                             \
2998   notproduct(intx, FullGCALotDummies,  32*K,                                \
2999           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3000           "to move")                                                        \
3001                                                                             \
3002   develop(intx, DontYieldALotInterval,    10,                               \
3003           "Interval between which yields will be dropped (milliseconds)")   \
3004                                                                             \
3005   develop(intx, MinSleepInterval,     1,                                    \
3006           "Minimum sleep() interval (milliseconds) when "                   \
3007           "ConvertSleepToYield is off (used for Solaris)")                  \
3008                                                                             \
3009   develop(intx, ProfilerPCTickThreshold,    15,                             \
3010           "Number of ticks in a PC buckets to be a hotspot")                \
3011                                                                             \
3012   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3013           "Number of exits until DeoptimizeALot kicks in")                  \
3014                                                                             \
3015   notproduct(intx, ZombieALotInterval,     5,                               \
3016           "Number of exits until ZombieALot kicks in")                      \
3017                                                                             \
3018   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3019           "If non-zero, maximum number of words that malloc/realloc can "   \
3020           "allocate (for testing only)")                                    \
3021           range(0, max_uintx)                                               \
3022                                                                             \
3023   product(intx, TypeProfileWidth, 2,                                        \
3024           "Number of receiver types to record in call/cast profile")        \
3025           range(0, 8)                                                       \
3026                                                                             \
3027   develop(intx, BciProfileWidth,      2,                                    \
3028           "Number of return bci's to record in ret profile")                \
3029                                                                             \
3030   product(intx, PerMethodRecompilationCutoff, 400,                          \
3031           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3032           range(-1, max_intx)                                               \
3033                                                                             \
3034   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3035           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3036           range(-1, max_intx)                                               \
3037                                                                             \
3038   product(intx, PerMethodTrapLimit,  100,                                   \
3039           "Limit on traps (of one kind) in a method (includes inlines)")    \
3040           range(0, max_jint)                                                \
3041                                                                             \
3042   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3043           "Limit on speculative traps (of one kind) in a method "           \
3044           "(includes inlines)")                                             \
3045           range(0, max_jint)                                                \
3046                                                                             \
3047   product(intx, PerBytecodeTrapLimit,  4,                                   \
3048           "Limit on traps (of one kind) at a particular BCI")               \
3049           range(0, max_jint)                                                \
3050                                                                             \
3051   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3052           "Extra method data trap entries for speculation")                 \
3053                                                                             \
3054   develop(intx, InlineFrequencyRatio,    20,                                \
3055           "Ratio of call site execution to caller method invocation")       \
3056           range(0, max_jint)                                                \
3057                                                                             \
3058   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3059           "Count of call site execution necessary to trigger frequent "     \
3060           "inlining")                                                       \
3061           range(0, max_jint)                                                \
3062                                                                             \
3063   develop(intx, InlineThrowCount,    50,                                    \
3064           "Force inlining of interpreted methods that throw this often")    \
3065           range(0, max_jint)                                                \
3066                                                                             \
3067   develop(intx, InlineThrowMaxSize,   200,                                  \
3068           "Force inlining of throwing methods smaller than this")           \
3069           range(0, max_jint)                                                \
3070                                                                             \
3071   develop(intx, ProfilerNodeSize,  1024,                                    \
3072           "Size in K to allocate for the Profile Nodes of each thread")     \
3073           range(0, 1024)                                                    \
3074                                                                             \
3075   /* gc parameters */                                                       \
3076   product(size_t, InitialHeapSize, 0,                                       \
3077           "Initial heap size (in bytes); zero means use ergonomics")        \
3078           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3079                                                                             \
3080   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3081           "Maximum heap size (in bytes)")                                   \
3082           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3083                                                                             \
3084   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3085           "Initial tenured generation size (in bytes)")                     \
3086           range(0, max_uintx)                                               \
3087                                                                             \
3088   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3089           "Initial new generation size (in bytes)")                         \
3090           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3091                                                                             \
3092   product(size_t, MaxNewSize, max_uintx,                                    \
3093           "Maximum new generation size (in bytes), max_uintx means set "    \
3094           "ergonomically")                                                  \
3095           range(0, max_uintx)                                               \
3096                                                                             \
3097   product_pd(size_t, HeapBaseMinAddress,                                    \
3098           "OS specific low limit for heap base address")                    \
3099           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3100                                                                             \
3101   product(size_t, PretenureSizeThreshold, 0,                                \
3102           "Maximum size in bytes of objects allocated in DefNew "           \
3103           "generation; zero means no maximum")                              \
3104           range(0, max_uintx)                                               \
3105                                                                             \
3106   product(size_t, MinTLABSize, 2*K,                                         \
3107           "Minimum allowed TLAB size (in bytes)")                           \
3108           range(1, max_uintx/2)                                             \
3109           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3110                                                                             \
3111   product(size_t, TLABSize, 0,                                              \
3112           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3113           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3114                                                                             \
3115   product(size_t, YoungPLABSize, 4096,                                      \
3116           "Size of young gen promotion LAB's (in HeapWords)")               \
3117           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3118                                                                             \
3119   product(size_t, OldPLABSize, 1024,                                        \
3120           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3121           "of blocks to attempt to claim when refilling CMS LAB's")         \
3122           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3123                                                                             \
3124   product(uintx, TLABAllocationWeight, 35,                                  \
3125           "Allocation averaging weight")                                    \
3126           range(0, 100)                                                     \
3127                                                                             \
3128   /* Limit the lower bound of this flag to 1 as it is used  */              \
3129   /* in a division expression.                              */              \
3130   product(uintx, TLABWasteTargetPercent, 1,                                 \
3131           "Percentage of Eden that can be wasted")                          \
3132           range(1, 100)                                                     \
3133                                                                             \
3134   product(uintx, TLABRefillWasteFraction,    64,                            \
3135           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3136           range(1, max_juint)                                               \
3137                                                                             \
3138   product(uintx, TLABWasteIncrement,    4,                                  \
3139           "Increment allowed waste at slow allocation")                     \
3140           range(0, max_jint)                                                \
3141           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3142                                                                             \
3143   product(uintx, SurvivorRatio, 8,                                          \
3144           "Ratio of eden/survivor space size")                              \
3145           range(1, max_uintx-2)                                             \
3146           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3147                                                                             \
3148   product(uintx, NewRatio, 2,                                               \
3149           "Ratio of old/new generation sizes")                              \
3150           range(0, max_uintx-1)                                             \
3151                                                                             \
3152   product_pd(size_t, NewSizeThreadIncrease,                                 \
3153           "Additional size added to desired new generation size per "       \
3154           "non-daemon thread (in bytes)")                                   \
3155           range(0, max_uintx)                                               \
3156                                                                             \
3157   product_pd(size_t, MetaspaceSize,                                         \
3158           "Initial threshold (in bytes) at which a garbage collection "     \
3159           "is done to reduce Metaspace usage")                              \
3160           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3161                                                                             \
3162   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3163           "Maximum size of Metaspaces (in bytes)")                          \
3164           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3165                                                                             \
3166   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3167           "Maximum size of class area in Metaspace when compressed "        \
3168           "class pointers are used")                                        \
3169           range(1*M, 3*G)                                                   \
3170                                                                             \
3171   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3172           "The minimum percentage of heap free after GC to avoid expansion."\
3173           " For most GCs this applies to the old generation. In G1 and"     \
3174           " ParallelGC it applies to the whole heap.")                      \
3175           range(0, 100)                                                     \
3176           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3177                                                                             \
3178   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3179           "The maximum percentage of heap free after GC to avoid shrinking."\
3180           " For most GCs this applies to the old generation. In G1 and"     \
3181           " ParallelGC it applies to the whole heap.")                      \
3182           range(0, 100)                                                     \
3183           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3184                                                                             \
3185   product(bool, ShrinkHeapInSteps, true,                                    \
3186           "When disabled, informs the GC to shrink the java heap directly"  \
3187           " to the target size at the next full GC rather than requiring"   \
3188           " smaller steps during multiple full GCs.")                       \
3189                                                                             \
3190   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3191           "Number of milliseconds per MB of free space in the heap")        \
3192           range(0, max_intx)                                                \
3193           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3194                                                                             \
3195   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3196           "The minimum change in heap space due to GC (in bytes)")          \
3197           range(0, max_uintx)                                               \
3198                                                                             \
3199   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3200           "The minimum expansion of Metaspace (in bytes)")                  \
3201           range(0, max_uintx)                                               \
3202                                                                             \
3203   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3204           "The maximum percentage of Metaspace free after GC to avoid "     \
3205           "shrinking")                                                      \
3206           range(0, 100)                                                     \
3207           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3208                                                                             \
3209   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3210           "The minimum percentage of Metaspace free after GC to avoid "     \
3211           "expansion")                                                      \
3212           range(0, 99)                                                      \
3213           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3214                                                                             \
3215   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3216           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3217           range(0, max_uintx)                                               \
3218                                                                             \
3219   product(uintx, QueuedAllocationWarningCount, 0,                           \
3220           "Number of times an allocation that queues behind a GC "          \
3221           "will retry before printing a warning")                           \
3222           range(0, max_uintx)                                               \
3223                                                                             \
3224   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3225           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3226           range(0, max_uintx)                                               \
3227                                                                             \
3228   diagnostic(intx, VerifyGCLevel,     0,                                    \
3229           "Generation level at which to start +VerifyBefore/AfterGC")       \
3230           range(0, 1)                                                       \
3231                                                                             \
3232   product(uintx, MaxTenuringThreshold,    15,                               \
3233           "Maximum value for tenuring threshold")                           \
3234           range(0, markOopDesc::max_age + 1)                                \
3235           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3236                                                                             \
3237   product(uintx, InitialTenuringThreshold,    7,                            \
3238           "Initial value for tenuring threshold")                           \
3239           range(0, markOopDesc::max_age + 1)                                \
3240           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3241                                                                             \
3242   product(uintx, TargetSurvivorRatio,    50,                                \
3243           "Desired percentage of survivor space used after scavenge")       \
3244           range(0, 100)                                                     \
3245                                                                             \
3246   product(uintx, MarkSweepDeadRatio,     5,                                 \
3247           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3248           "Serial mark sweep treats this as both the minimum and maximum "  \
3249           "value. "                                                         \
3250           "CMS uses this value only if it falls back to mark sweep. "       \
3251           "Par compact uses a variable scale based on the density of the "  \
3252           "generation and treats this as the maximum value when the heap "  \
3253           "is either completely full or completely empty.  Par compact "    \
3254           "also has a smaller default value; see arguments.cpp.")           \
3255           range(0, 100)                                                     \
3256                                                                             \
3257   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3258           "How often should we fully compact the heap (ignoring the dead "  \
3259           "space parameters)")                                              \
3260           range(1, max_juint)                                               \
3261                                                                             \
3262   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3263           "Delay between expansion and allocation (in milliseconds)")       \
3264                                                                             \
3265   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3266           "Delay in scheduling GC workers (in milliseconds)")               \
3267                                                                             \
3268   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3269           "(Unstable) Number of times to iterate in safepoint loop "        \
3270           "before blocking VM threads ")                                    \
3271           range(-1, max_jint-1)                                             \
3272                                                                             \
3273   product(intx, DeferPollingPageLoopCount,     -1,                          \
3274           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3275           "before changing safepoint polling page to RO ")                  \
3276           range(-1, max_jint-1)                                             \
3277                                                                             \
3278   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3279           range(0, max_intx)                                                \
3280                                                                             \
3281   product(bool, PSChunkLargeArrays, true,                                   \
3282           "Process large arrays in chunks")                                 \
3283                                                                             \
3284   product(uintx, GCDrainStackTargetSize, 64,                                \
3285           "Number of entries we will try to leave on the stack "            \
3286           "during parallel gc")                                             \
3287           range(0, max_juint)                                               \
3288                                                                             \
3289   /* stack parameters */                                                    \
3290   product_pd(intx, StackYellowPages,                                        \
3291           "Number of yellow zone (recoverable overflows) pages of size "    \
3292           "4KB. If pages are bigger yellow zone is aligned up.")            \
3293           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3294                                                                             \
3295   product_pd(intx, StackRedPages,                                           \
3296           "Number of red zone (unrecoverable overflows) pages of size "     \
3297           "4KB. If pages are bigger red zone is aligned up.")               \
3298           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3299                                                                             \
3300   product_pd(intx, StackReservedPages,                                      \
3301           "Number of reserved zone (reserved to annotated methods) pages"   \
3302           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3303           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3304                                                                             \
3305   product(bool, RestrictReservedStack, true,                                \
3306           "Restrict @ReservedStackAccess to trusted classes")               \
3307                                                                             \
3308   /* greater stack shadow pages can't generate instruction to bang stack */ \
3309   product_pd(intx, StackShadowPages,                                        \
3310           "Number of shadow zone (for overflow checking) pages of size "    \
3311           "4KB. If pages are bigger shadow zone is aligned up. "            \
3312           "This should exceed the depth of the VM and native call stack.")  \
3313           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3314                                                                             \
3315   product_pd(intx, ThreadStackSize,                                         \
3316           "Thread Stack Size (in Kbytes)")                                  \
3317           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3318                                                                             \
3319   product_pd(intx, VMThreadStackSize,                                       \
3320           "Non-Java Thread Stack Size (in Kbytes)")                         \
3321           range(0, max_intx/(1 * K))                                        \
3322                                                                             \
3323   product_pd(intx, CompilerThreadStackSize,                                 \
3324           "Compiler Thread Stack Size (in Kbytes)")                         \
3325           range(0, max_intx/(1 * K))                                        \
3326                                                                             \
3327   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3328           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3329                                                                             \
3330   /* code cache parameters                                    */            \
3331   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3332           "Code cache segment size (in bytes) - smallest unit of "          \
3333           "allocation")                                                     \
3334           range(1, 1024)                                                    \
3335           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3336                                                                             \
3337   develop_pd(intx, CodeEntryAlignment,                                      \
3338           "Code entry alignment for generated code (in bytes)")             \
3339           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3340                                                                             \
3341   product_pd(intx, OptoLoopAlignment,                                       \
3342           "Align inner loops to zero relative to this modulus")             \
3343           range(1, 16)                                                      \
3344           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3345                                                                             \
3346   product_pd(uintx, InitialCodeCacheSize,                                   \
3347           "Initial code cache size (in bytes)")                             \
3348           range(0, max_uintx)                                               \
3349                                                                             \
3350   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3351           "Minimum code cache size (in bytes) required to start VM.")       \
3352           range(0, max_uintx)                                               \
3353                                                                             \
3354   product(bool, SegmentedCodeCache, false,                                  \
3355           "Use a segmented code cache")                                     \
3356                                                                             \
3357   product_pd(uintx, ReservedCodeCacheSize,                                  \
3358           "Reserved code cache size (in bytes) - maximum code cache size")  \
3359           range(0, max_uintx)                                               \
3360                                                                             \
3361   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3362           "Size of code heap with non-profiled methods (in bytes)")         \
3363           range(0, max_uintx)                                               \
3364                                                                             \
3365   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3366           "Size of code heap with profiled methods (in bytes)")             \
3367           range(0, max_uintx)                                               \
3368                                                                             \
3369   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3370           "Size of code heap with non-nmethods (in bytes)")                 \
3371           range(0, max_uintx)                                               \
3372                                                                             \
3373   product_pd(uintx, CodeCacheExpansionSize,                                 \
3374           "Code cache expansion size (in bytes)")                           \
3375           range(0, max_uintx)                                               \
3376                                                                             \
3377   product_pd(uintx, CodeCacheMinBlockLength,                                \
3378           "Minimum number of segments in a code cache block")               \
3379           range(1, 100)                                                     \
3380                                                                             \
3381   notproduct(bool, ExitOnFullCodeCache, false,                              \
3382           "Exit the VM if we fill the code cache")                          \
3383                                                                             \
3384   product(bool, UseCodeCacheFlushing, true,                                 \
3385           "Remove cold/old nmethods from the code cache")                   \
3386                                                                             \
3387   product(uintx, StartAggressiveSweepingAt, 10,                             \
3388           "Start aggressive sweeping if X[%] of the code cache is free."    \
3389           "Segmented code cache: X[%] of the non-profiled heap."            \
3390           "Non-segmented code cache: X[%] of the total code cache")         \
3391           range(0, 100)                                                     \
3392                                                                             \
3393   /* AOT parameters */                                                      \
3394   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3395           "Use AOT compiled files")                                         \
3396                                                                             \
3397   product(ccstrlist, AOTLibrary, NULL,                                      \
3398           "AOT library")                                                    \
3399                                                                             \
3400   product(bool, PrintAOT, false,                                            \
3401           "Print used AOT klasses and methods")                             \
3402                                                                             \
3403   notproduct(bool, PrintAOTStatistics, false,                               \
3404           "Print AOT statistics")                                           \
3405                                                                             \
3406   diagnostic(bool, UseAOTStrictLoading, false,                              \
3407           "Exit the VM if any of the AOT libraries has invalid config")     \
3408                                                                             \
3409   /* interpreter debugging */                                               \
3410   develop(intx, BinarySwitchThreshold, 5,                                   \
3411           "Minimal number of lookupswitch entries for rewriting to binary " \
3412           "switch")                                                         \
3413                                                                             \
3414   develop(intx, StopInterpreterAt, 0,                                       \
3415           "Stop interpreter execution at specified bytecode number")        \
3416                                                                             \
3417   develop(intx, TraceBytecodesAt, 0,                                        \
3418           "Trace bytecodes starting with specified bytecode number")        \
3419                                                                             \
3420   /* compiler interface */                                                  \
3421   develop(intx, CIStart, 0,                                                 \
3422           "The id of the first compilation to permit")                      \
3423                                                                             \
3424   develop(intx, CIStop, max_jint,                                           \
3425           "The id of the last compilation to permit")                       \
3426                                                                             \
3427   develop(intx, CIStartOSR, 0,                                              \
3428           "The id of the first osr compilation to permit "                  \
3429           "(CICountOSR must be on)")                                        \
3430                                                                             \
3431   develop(intx, CIStopOSR, max_jint,                                        \
3432           "The id of the last osr compilation to permit "                   \
3433           "(CICountOSR must be on)")                                        \
3434                                                                             \
3435   develop(intx, CIBreakAtOSR, -1,                                           \
3436           "The id of osr compilation to break at")                          \
3437                                                                             \
3438   develop(intx, CIBreakAt, -1,                                              \
3439           "The id of compilation to break at")                              \
3440                                                                             \
3441   product(ccstrlist, CompileOnly, "",                                       \
3442           "List of methods (pkg/class.name) to restrict compilation to")    \
3443                                                                             \
3444   product(ccstr, CompileCommandFile, NULL,                                  \
3445           "Read compiler commands from this file [.hotspot_compiler]")      \
3446                                                                             \
3447   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3448           "Read compiler directives from this file")                        \
3449                                                                             \
3450   product(ccstrlist, CompileCommand, "",                                    \
3451           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3452                                                                             \
3453   develop(bool, ReplayCompiles, false,                                      \
3454           "Enable replay of compilations from ReplayDataFile")              \
3455                                                                             \
3456   product(ccstr, ReplayDataFile, NULL,                                      \
3457           "File containing compilation replay information"                  \
3458           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3459                                                                             \
3460    product(ccstr, InlineDataFile, NULL,                                     \
3461           "File containing inlining replay information"                     \
3462           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3463                                                                             \
3464   develop(intx, ReplaySuppressInitializers, 2,                              \
3465           "Control handling of class initialization during replay: "        \
3466           "0 - don't do anything special; "                                 \
3467           "1 - treat all class initializers as empty; "                     \
3468           "2 - treat class initializers for application classes as empty; " \
3469           "3 - allow all class initializers to run during bootstrap but "   \
3470           "    pretend they are empty after starting replay")               \
3471           range(0, 3)                                                       \
3472                                                                             \
3473   develop(bool, ReplayIgnoreInitErrors, false,                              \
3474           "Ignore exceptions thrown during initialization for replay")      \
3475                                                                             \
3476   product(bool, DumpReplayDataOnError, true,                                \
3477           "Record replay data for crashing compiler threads")               \
3478                                                                             \
3479   product(bool, CICompilerCountPerCPU, false,                               \
3480           "1 compiler thread for log(N CPUs)")                              \
3481                                                                             \
3482   develop(intx, CIFireOOMAt,    -1,                                         \
3483           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3484           "(non-negative value throws OOM after this many CI accesses "     \
3485           "in each compile)")                                               \
3486   notproduct(intx, CICrashAt, -1,                                           \
3487           "id of compilation to trigger assert in compiler thread for "     \
3488           "the purpose of testing, e.g. generation of replay data")         \
3489   notproduct(bool, CIObjectFactoryVerify, false,                            \
3490           "enable potentially expensive verification in ciObjectFactory")   \
3491                                                                             \
3492   /* Priorities */                                                          \
3493   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3494                                                                             \
3495   product(intx, ThreadPriorityPolicy, 0,                                    \
3496           "0 : Normal.                                                     "\
3497           "    VM chooses priorities that are appropriate for normal       "\
3498           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3499           "    to normal native priority. Java priorities below "           \
3500           "    NORM_PRIORITY map to lower native priority values. On       "\
3501           "    Windows applications are allowed to use higher native       "\
3502           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3503           "    not use the highest possible native priority,               "\
3504           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3505           "    system threads. On Linux thread priorities are ignored      "\
3506           "    because the OS does not support static priority in          "\
3507           "    SCHED_OTHER scheduling class which is the only choice for   "\
3508           "    non-root, non-realtime applications.                        "\
3509           "1 : Aggressive.                                                 "\
3510           "    Java thread priorities map over to the entire range of      "\
3511           "    native thread priorities. Higher Java thread priorities map "\
3512           "    to higher native thread priorities. This policy should be   "\
3513           "    used with care, as sometimes it can cause performance       "\
3514           "    degradation in the application and/or the entire system. On "\
3515           "    Linux this policy requires root privilege.")                 \
3516           range(0, 1)                                                       \
3517                                                                             \
3518   product(bool, ThreadPriorityVerbose, false,                               \
3519           "Print priority changes")                                         \
3520                                                                             \
3521   product(intx, CompilerThreadPriority, -1,                                 \
3522           "The native priority at which compiler threads should run "       \
3523           "(-1 means no change)")                                           \
3524           range(min_jint, max_jint)                                         \
3525           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3526                                                                             \
3527   product(intx, VMThreadPriority, -1,                                       \
3528           "The native priority at which the VM thread should run "          \
3529           "(-1 means no change)")                                           \
3530           range(-1, 127)                                                    \
3531                                                                             \
3532   product(bool, CompilerThreadHintNoPreempt, true,                          \
3533           "(Solaris only) Give compiler threads an extra quanta")           \
3534                                                                             \
3535   product(bool, VMThreadHintNoPreempt, false,                               \
3536           "(Solaris only) Give VM thread an extra quanta")                  \
3537                                                                             \
3538   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3539           "Map Java priorities to OS priorities")                           \
3540           range(-1, 127)                                                    \
3541                                                                             \
3542   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3543           "Map Java priorities to OS priorities")                           \
3544           range(-1, 127)                                                    \
3545                                                                             \
3546   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3547           "Map Java priorities to OS priorities")                           \
3548           range(-1, 127)                                                    \
3549                                                                             \
3550   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552           range(-1, 127)                                                    \
3553                                                                             \
3554   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3555           "Map Java priorities to OS priorities")                           \
3556           range(-1, 127)                                                    \
3557                                                                             \
3558   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3559           "Map Java priorities to OS priorities")                           \
3560           range(-1, 127)                                                    \
3561                                                                             \
3562   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3563           "Map Java priorities to OS priorities")                           \
3564           range(-1, 127)                                                    \
3565                                                                             \
3566   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3567           "Map Java priorities to OS priorities")                           \
3568           range(-1, 127)                                                    \
3569                                                                             \
3570   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3571           "Map Java priorities to OS priorities")                           \
3572           range(-1, 127)                                                    \
3573                                                                             \
3574   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3575           "Map Java priorities to OS priorities")                           \
3576           range(-1, 127)                                                    \
3577                                                                             \
3578   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3579           "Java thread priority 10 maps to critical scheduling priority")   \
3580                                                                             \
3581   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3582           "Compiler thread(s) run at critical scheduling priority")         \
3583                                                                             \
3584   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3585           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3586                                                                             \
3587   /* compiler debugging */                                                  \
3588   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3589           "First class to consider when using +CompileTheWorld")            \
3590                                                                             \
3591   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3592           "Last class to consider when using +CompileTheWorld")             \
3593                                                                             \
3594   develop(intx, NewCodeParameter,      0,                                   \
3595           "Testing Only: Create a dedicated integer parameter before "      \
3596           "putback")                                                        \
3597                                                                             \
3598   /* new oopmap storage allocation */                                       \
3599   develop(intx, MinOopMapAllocation,     8,                                 \
3600           "Minimum number of OopMap entries in an OopMapSet")               \
3601                                                                             \
3602   /* Background Compilation */                                              \
3603   develop(intx, LongCompileThreshold,     50,                               \
3604           "Used with +TraceLongCompiles")                                   \
3605                                                                             \
3606   /* recompilation */                                                       \
3607   product_pd(intx, CompileThreshold,                                        \
3608           "number of interpreted method invocations before (re-)compiling") \
3609           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3610                                                                             \
3611   product(double, CompileThresholdScaling, 1.0,                             \
3612           "Factor to control when first compilation happens "               \
3613           "(both with and without tiered compilation): "                    \
3614           "values greater than 1.0 delay counter overflow, "                \
3615           "values between 0 and 1.0 rush counter overflow, "                \
3616           "value of 1.0 leaves compilation thresholds unchanged "           \
3617           "value of 0.0 is equivalent to -Xint. "                           \
3618           ""                                                                \
3619           "Flag can be set as per-method option. "                          \
3620           "If a value is specified for a method, compilation thresholds "   \
3621           "for that method are scaled by both the value of the global flag "\
3622           "and the value of the per-method flag.")                          \
3623           range(0.0, DBL_MAX)                                               \
3624                                                                             \
3625   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3626           "Interpreter (tier 0) invocation notification frequency")         \
3627           range(0, 30)                                                      \
3628                                                                             \
3629   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3630           "C1 without MDO (tier 2) invocation notification frequency")      \
3631           range(0, 30)                                                      \
3632                                                                             \
3633   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3634           "C1 with MDO profiling (tier 3) invocation notification "         \
3635           "frequency")                                                      \
3636           range(0, 30)                                                      \
3637                                                                             \
3638   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3639           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3640           range(0, 30)                                                      \
3641                                                                             \
3642   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3643           "Interpreter (tier 0) invocation notification frequency")         \
3644           range(0, 30)                                                      \
3645                                                                             \
3646   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3647           "C1 without MDO (tier 2) invocation notification frequency")      \
3648           range(0, 30)                                                      \
3649                                                                             \
3650   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3651           "C1 with MDO profiling (tier 3) invocation notification "         \
3652           "frequency")                                                      \
3653           range(0, 30)                                                      \
3654                                                                             \
3655   product(intx, Tier2CompileThreshold, 0,                                   \
3656           "threshold at which tier 2 compilation is invoked")               \
3657           range(0, max_jint)                                                \
3658                                                                             \
3659   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3660           "Back edge threshold at which tier 2 compilation is invoked")     \
3661           range(0, max_jint)                                                \
3662                                                                             \
3663   product(intx, Tier3InvocationThreshold, 200,                              \
3664           "Compile if number of method invocations crosses this "           \
3665           "threshold")                                                      \
3666           range(0, max_jint)                                                \
3667                                                                             \
3668   product(intx, Tier3MinInvocationThreshold, 100,                           \
3669           "Minimum invocation to compile at tier 3")                        \
3670           range(0, max_jint)                                                \
3671                                                                             \
3672   product(intx, Tier3CompileThreshold, 2000,                                \
3673           "Threshold at which tier 3 compilation is invoked (invocation "   \
3674           "minimum must be satisfied)")                                     \
3675           range(0, max_jint)                                                \
3676                                                                             \
3677   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3678           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3679           range(0, max_jint)                                                \
3680                                                                             \
3681   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3682           "Compile if number of method invocations crosses this "           \
3683           "threshold if coming from AOT")                                   \
3684           range(0, max_jint)                                                \
3685                                                                             \
3686   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3687           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3688           range(0, max_jint)                                                \
3689                                                                             \
3690   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3691           "Threshold at which tier 3 compilation is invoked (invocation "   \
3692           "minimum must be satisfied) if coming from AOT")                  \
3693           range(0, max_jint)                                                \
3694                                                                             \
3695   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3696           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3697           "if coming from AOT")                                             \
3698           range(0, max_jint)                                                \
3699                                                                             \
3700   product(intx, Tier4InvocationThreshold, 5000,                             \
3701           "Compile if number of method invocations crosses this "           \
3702           "threshold")                                                      \
3703           range(0, max_jint)                                                \
3704                                                                             \
3705   product(intx, Tier4MinInvocationThreshold, 600,                           \
3706           "Minimum invocation to compile at tier 4")                        \
3707           range(0, max_jint)                                                \
3708                                                                             \
3709   product(intx, Tier4CompileThreshold, 15000,                               \
3710           "Threshold at which tier 4 compilation is invoked (invocation "   \
3711           "minimum must be satisfied")                                      \
3712           range(0, max_jint)                                                \
3713                                                                             \
3714   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3715           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3716           range(0, max_jint)                                                \
3717                                                                             \
3718   product(intx, Tier3DelayOn, 5,                                            \
3719           "If C2 queue size grows over this amount per compiler thread "    \
3720           "stop compiling at tier 3 and start compiling at tier 2")         \
3721           range(0, max_jint)                                                \
3722                                                                             \
3723   product(intx, Tier3DelayOff, 2,                                           \
3724           "If C2 queue size is less than this amount per compiler thread "  \
3725           "allow methods compiled at tier 2 transition to tier 3")          \
3726           range(0, max_jint)                                                \
3727                                                                             \
3728   product(intx, Tier3LoadFeedback, 5,                                       \
3729           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3730           "reaches this amount per compiler thread")                        \
3731           range(0, max_jint)                                                \
3732                                                                             \
3733   product(intx, Tier4LoadFeedback, 3,                                       \
3734           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3735           "reaches this amount per compiler thread")                        \
3736           range(0, max_jint)                                                \
3737                                                                             \
3738   product(intx, TieredCompileTaskTimeout, 50,                               \
3739           "Kill compile task if method was not used within "                \
3740           "given timeout in milliseconds")                                  \
3741           range(0, max_intx)                                                \
3742                                                                             \
3743   product(intx, TieredStopAtLevel, 4,                                       \
3744           "Stop at given compilation level")                                \
3745           range(0, 4)                                                       \
3746                                                                             \
3747   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3748           "Start profiling in interpreter if the counters exceed tier 3 "   \
3749           "thresholds by the specified percentage")                         \
3750           range(0, max_jint)                                                \
3751                                                                             \
3752   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3753           "Increase the compile threshold for C1 compilation if the code "  \
3754           "cache is filled by the specified percentage")                    \
3755           range(0, 99)                                                      \
3756                                                                             \
3757   product(intx, TieredRateUpdateMinTime, 1,                                 \
3758           "Minimum rate sampling interval (in milliseconds)")               \
3759           range(0, max_intx)                                                \
3760                                                                             \
3761   product(intx, TieredRateUpdateMaxTime, 25,                                \
3762           "Maximum rate sampling interval (in milliseconds)")               \
3763           range(0, max_intx)                                                \
3764                                                                             \
3765   product_pd(bool, TieredCompilation,                                       \
3766           "Enable tiered compilation")                                      \
3767                                                                             \
3768   product(bool, PrintTieredEvents, false,                                   \
3769           "Print tiered events notifications")                              \
3770                                                                             \
3771   product_pd(intx, OnStackReplacePercentage,                                \
3772           "NON_TIERED number of method invocations/branches (expressed as " \
3773           "% of CompileThreshold) before (re-)compiling OSR code")          \
3774           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3775                                                                             \
3776   product(intx, InterpreterProfilePercentage, 33,                           \
3777           "NON_TIERED number of method invocations/branches (expressed as " \
3778           "% of CompileThreshold) before profiling in the interpreter")     \
3779           range(0, 100)                                                     \
3780                                                                             \
3781   develop(intx, MaxRecompilationSearchLength,    10,                        \
3782           "The maximum number of frames to inspect when searching for "     \
3783           "recompilee")                                                     \
3784                                                                             \
3785   develop(intx, MaxInterpretedSearchLength,     3,                          \
3786           "The maximum number of interpreted frames to skip when searching "\
3787           "for recompilee")                                                 \
3788                                                                             \
3789   develop(intx, DesiredMethodLimit,  8000,                                  \
3790           "The desired maximum method size (in bytecodes) after inlining")  \
3791                                                                             \
3792   develop(intx, HugeMethodLimit,  8000,                                     \
3793           "Don't compile methods larger than this if "                      \
3794           "+DontCompileHugeMethods")                                        \
3795                                                                             \
3796   /* New JDK 1.4 reflection implementation */                               \
3797                                                                             \
3798   develop(intx, FastSuperclassLimit, 8,                                     \
3799           "Depth of hardwired instanceof accelerator array")                \
3800                                                                             \
3801   /* Properties for Java libraries  */                                      \
3802                                                                             \
3803   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3804           "Maximum total size of NIO direct-buffer allocations")            \
3805           range(0, max_jlong)                                               \
3806                                                                             \
3807   /* Flags used for temporary code during development  */                   \
3808                                                                             \
3809   diagnostic(bool, UseNewCode, false,                                       \
3810           "Testing Only: Use the new version while testing")                \
3811                                                                             \
3812   diagnostic(bool, UseNewCode2, false,                                      \
3813           "Testing Only: Use the new version while testing")                \
3814                                                                             \
3815   diagnostic(bool, UseNewCode3, false,                                      \
3816           "Testing Only: Use the new version while testing")                \
3817                                                                             \
3818   /* flags for performance data collection */                               \
3819                                                                             \
3820   product(bool, UsePerfData, true,                                          \
3821           "Flag to disable jvmstat instrumentation for performance testing "\
3822           "and problem isolation purposes")                                 \
3823                                                                             \
3824   product(bool, PerfDataSaveToFile, false,                                  \
3825           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3826                                                                             \
3827   product(ccstr, PerfDataSaveFile, NULL,                                    \
3828           "Save PerfData memory to the specified absolute pathname. "       \
3829           "The string %p in the file name (if present) "                    \
3830           "will be replaced by pid")                                        \
3831                                                                             \
3832   product(intx, PerfDataSamplingInterval, 50,                               \
3833           "Data sampling interval (in milliseconds)")                       \
3834           range(PeriodicTask::min_interval, max_jint)                       \
3835           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3836                                                                             \
3837   develop(bool, PerfTraceDataCreation, false,                               \
3838           "Trace creation of Performance Data Entries")                     \
3839                                                                             \
3840   develop(bool, PerfTraceMemOps, false,                                     \
3841           "Trace PerfMemory create/attach/detach calls")                    \
3842                                                                             \
3843   product(bool, PerfDisableSharedMem, false,                                \
3844           "Store performance data in standard memory")                      \
3845                                                                             \
3846   product(intx, PerfDataMemorySize, 32*K,                                   \
3847           "Size of performance data memory region. Will be rounded "        \
3848           "up to a multiple of the native os page size.")                   \
3849           range(128, 32*64*K)                                               \
3850                                                                             \
3851   product(intx, PerfMaxStringConstLength, 1024,                             \
3852           "Maximum PerfStringConstant string length before truncation")     \
3853           range(32, 32*K)                                                   \
3854                                                                             \
3855   product(bool, PerfAllowAtExitRegistration, false,                         \
3856           "Allow registration of atexit() methods")                         \
3857                                                                             \
3858   product(bool, PerfBypassFileSystemCheck, false,                           \
3859           "Bypass Win32 file system criteria checks (Windows Only)")        \
3860                                                                             \
3861   product(intx, UnguardOnExecutionViolation, 0,                             \
3862           "Unguard page and retry on no-execute fault (Win32 only) "        \
3863           "0=off, 1=conservative, 2=aggressive")                            \
3864           range(0, 2)                                                       \
3865                                                                             \
3866   /* Serviceability Support */                                              \
3867                                                                             \
3868   product(bool, ManagementServer, false,                                    \
3869           "Create JMX Management Server")                                   \
3870                                                                             \
3871   product(bool, DisableAttachMechanism, false,                              \
3872           "Disable mechanism that allows tools to attach to this VM")       \
3873                                                                             \
3874   product(bool, StartAttachListener, false,                                 \
3875           "Always start Attach Listener at VM startup")                     \
3876                                                                             \
3877   manageable(bool, PrintConcurrentLocks, false,                             \
3878           "Print java.util.concurrent locks in thread dump")                \
3879                                                                             \
3880   product(bool, TransmitErrorReport, false,                                 \
3881           "Enable error report transmission on erroneous termination")      \
3882                                                                             \
3883   product(ccstr, ErrorReportServer, NULL,                                   \
3884           "Override built-in error report server address")                  \
3885                                                                             \
3886   /* Shared spaces */                                                       \
3887                                                                             \
3888   product(bool, UseSharedSpaces, true,                                      \
3889           "Use shared spaces for metadata")                                 \
3890                                                                             \
3891   product(bool, VerifySharedSpaces, false,                                  \
3892           "Verify shared spaces (false for default archive, true for "      \
3893           "archive specified by -XX:SharedArchiveFile)")                    \
3894                                                                             \
3895   product(bool, RequireSharedSpaces, false,                                 \
3896           "Require shared spaces for metadata")                             \
3897                                                                             \
3898   product(bool, DumpSharedSpaces, false,                                    \
3899           "Special mode: JVM reads a class list, loads classes, builds "    \
3900           "shared spaces, and dumps the shared spaces to a file to be "     \
3901           "used in future JVM runs")                                        \
3902                                                                             \
3903   product(bool, PrintSharedSpaces, false,                                   \
3904           "Print usage of shared spaces")                                   \
3905                                                                             \
3906   product(bool, PrintSharedArchiveAndExit, false,                           \
3907           "Print shared archive file contents")                             \
3908                                                                             \
3909   product(bool, PrintSharedDictionary, false,                               \
3910           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3911           "dictionary")                                                     \
3912                                                                             \
3913   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3914           "Size of read-write space for metadata (in bytes)")               \
3915           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3916           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3917                                                                             \
3918   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3919           "Size of read-only space for metadata (in bytes)")                \
3920           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3921           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3922                                                                             \
3923   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3924           "Size of the shared miscellaneous data area (in bytes)")          \
3925           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3926           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3927                                                                             \
3928   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3929           "Size of the shared miscellaneous code area (in bytes)")          \
3930           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3931           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3932                                                                             \
3933   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3934           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3935           "Address to allocate shared memory region for class data")        \
3936           range(0, SIZE_MAX)                                                \
3937                                                                             \
3938   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3939           "Average number of symbols per bucket in shared table")           \
3940           range(2, 246)                                                     \
3941                                                                             \
3942   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3943           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3944           "classes. Just exclude them from the shared dictionary.")         \
3945                                                                             \
3946   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3947           "Print generated stub code for method handles")                   \
3948                                                                             \
3949   develop(bool, TraceMethodHandles, false,                                  \
3950           "trace internal method handle operations")                        \
3951                                                                             \
3952   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3953           "perform extra checks when constructing method handles")          \
3954                                                                             \
3955   diagnostic(bool, ShowHiddenFrames, false,                                 \
3956           "show method handle implementation frames (usually hidden)")      \
3957                                                                             \
3958   experimental(bool, TrustFinalNonStaticFields, false,                      \
3959           "trust final non-static declarations for constant folding")       \
3960                                                                             \
3961   diagnostic(bool, FoldStableValues, true,                                  \
3962           "Optimize loads from stable fields (marked w/ @Stable)")          \
3963                                                                             \
3964   develop(bool, TraceInvokeDynamic, false,                                  \
3965           "trace internal invoke dynamic operations")                       \
3966                                                                             \
3967   diagnostic(bool, PauseAtStartup,      false,                              \
3968           "Causes the VM to pause at startup time and wait for the pause "  \
3969           "file to be removed (default: ./vm.paused.<pid>)")                \
3970                                                                             \
3971   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3972           "The file to create and for whose removal to await when pausing " \
3973           "at startup. (default: ./vm.paused.<pid>)")                       \
3974                                                                             \
3975   diagnostic(bool, PauseAtExit, false,                                      \
3976           "Pause and wait for keypress on exit if a debugger is attached")  \
3977                                                                             \
3978   product(bool, ExtendedDTraceProbes,    false,                             \
3979           "Enable performance-impacting dtrace probes")                     \
3980                                                                             \
3981   product(bool, DTraceMethodProbes, false,                                  \
3982           "Enable dtrace probes for method-entry and method-exit")          \
3983                                                                             \
3984   product(bool, DTraceAllocProbes, false,                                   \
3985           "Enable dtrace probes for object allocation")                     \
3986                                                                             \
3987   product(bool, DTraceMonitorProbes, false,                                 \
3988           "Enable dtrace probes for monitor events")                        \
3989                                                                             \
3990   product(bool, RelaxAccessControlCheck, false,                             \
3991           "Relax the access control checks in the verifier")                \
3992                                                                             \
3993   product(uintx, StringTableSize, defaultStringTableSize,                   \
3994           "Number of buckets in the interned String table")                 \
3995           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3996                                                                             \
3997   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3998           "Number of buckets in the JVM internal Symbol table")             \
3999           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4000                                                                             \
4001   product(bool, UseStringDeduplication, false,                              \
4002           "Use string deduplication")                                       \
4003                                                                             \
4004   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4005           "A string must reach this age (or be promoted to an old region) " \
4006           "to be considered for deduplication")                             \
4007           range(1, markOopDesc::max_age)                                    \
4008                                                                             \
4009   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4010           "Force table resize every time the table is scanned")             \
4011                                                                             \
4012   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4013           "Force table rehash every time the table is scanned")             \
4014                                                                             \
4015   diagnostic(bool, WhiteBoxAPI, false,                                      \
4016           "Enable internal testing APIs")                                   \
4017                                                                             \
4018   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4019            "Default survivor space alignment in bytes")                     \
4020            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4021                                                                             \
4022   product(bool , AllowNonVirtualCalls, false,                               \
4023           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4024                                                                             \
4025   product(ccstr, DumpLoadedClassList, NULL,                                 \
4026           "Dump the names all loaded classes, that could be stored into "   \
4027           "the CDS archive, in the specified file")                         \
4028                                                                             \
4029   product(ccstr, SharedClassListFile, NULL,                                 \
4030           "Override the default CDS class list")                            \
4031                                                                             \
4032   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4033           "Override the default location of the CDS archive file")          \
4034                                                                             \
4035   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4036           "Extra classlist for building the CDS archive file")              \
4037                                                                             \
4038   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4039           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4040           "Allocation less than this value will be allocated "              \
4041           "using malloc. Larger allocations will use mmap.")                \
4042                                                                             \
4043   experimental(bool, AlwaysAtomicAccesses, false,                           \
4044           "Accesses to all variables should always be atomic")              \
4045                                                                             \
4046   product(bool, EnableTracing, false,                                       \
4047           "Enable event-based tracing")                                     \
4048                                                                             \
4049   product(bool, UseLockedTracing, false,                                    \
4050           "Use locked-tracing when doing event-based tracing")              \
4051                                                                             \
4052   diagnostic(bool, UseUnalignedAccesses, false,                             \
4053           "Use unaligned memory accesses in Unsafe")                        \
4054                                                                             \
4055   product_pd(bool, PreserveFramePointer,                                    \
4056              "Use the FP register for holding the frame pointer "           \
4057              "and not as a general purpose register.")                      \
4058                                                                             \
4059   diagnostic(bool, CheckIntrinsics, true,                                   \
4060              "When a class C is loaded, check that "                        \
4061              "(1) all intrinsics defined by the VM for class C are present "\
4062              "in the loaded class file and are marked with the "            \
4063              "@HotSpotIntrinsicCandidate annotation, that "                 \
4064              "(2) there is an intrinsic registered for all loaded methods " \
4065              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4066              "annotation, and that "                                        \
4067              "(3) no orphan methods exist for class C (i.e., methods for "  \
4068              "which the VM declares an intrinsic but that are not declared "\
4069              "in the loaded class C. "                                      \
4070              "Check (3) is available only in debug builds.")                \
4071                                                                             \
4072   diagnostic_pd(intx, InitArrayShortSize,                                   \
4073           "Threshold small size (in bytes) for clearing arrays. "           \
4074           "Anything this size or smaller may get converted to discrete "    \
4075           "scalar stores.")                                                 \
4076           range(0, max_intx)                                                \
4077           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4078                                                                             \
4079   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4080              "Disable backwards compatibility for compile commands.")       \
4081                                                                             \
4082   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4083              "Print compiler directives on installation.")                  \
4084   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4085              "Limit on number of compiler directives.")
4086 
4087 
4088 /*
4089  *  Macros for factoring of globals
4090  */
4091 
4092 // Interface macros
4093 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4094 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4095 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4096 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4097 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4098 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4099 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4100 #ifdef PRODUCT
4101 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4102 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4103 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4104 #else
4105 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4106 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4107 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4108 #endif // PRODUCT
4109 // Special LP64 flags, product only needed for now.
4110 #ifdef _LP64
4111 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4112 #else
4113 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4114 #endif // _LP64
4115 
4116 // Implementation macros
4117 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4118 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4119 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4120 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4121 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4122 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4123 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4124 #ifdef PRODUCT
4125 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4126 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4127 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4128 #else
4129 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4130 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4131 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4132 #endif // PRODUCT
4133 #ifdef _LP64
4134 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4135 #else
4136 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4137 #endif // _LP64
4138 
4139 // Only materialize src code for range checking when required, ignore otherwise
4140 #define IGNORE_RANGE(a, b)
4141 // Only materialize src code for contraint checking when required, ignore otherwise
4142 #define IGNORE_CONSTRAINT(func,type)
4143 
4144 #define IGNORE_WRITEABLE(type)
4145 
4146 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4147               DECLARE_PD_DEVELOPER_FLAG, \
4148               DECLARE_PRODUCT_FLAG, \
4149               DECLARE_PD_PRODUCT_FLAG, \
4150               DECLARE_DIAGNOSTIC_FLAG, \
4151               DECLARE_PD_DIAGNOSTIC_FLAG, \
4152               DECLARE_EXPERIMENTAL_FLAG, \
4153               DECLARE_NOTPRODUCT_FLAG, \
4154               DECLARE_MANAGEABLE_FLAG, \
4155               DECLARE_PRODUCT_RW_FLAG, \
4156               DECLARE_LP64_PRODUCT_FLAG, \
4157               IGNORE_RANGE, \
4158               IGNORE_CONSTRAINT, \
4159               IGNORE_WRITEABLE)
4160 
4161 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4162                  DECLARE_PD_DEVELOPER_FLAG, \
4163                  DECLARE_PRODUCT_FLAG, \
4164                  DECLARE_PD_PRODUCT_FLAG, \
4165                  DECLARE_DIAGNOSTIC_FLAG, \
4166                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4167                  DECLARE_NOTPRODUCT_FLAG, \
4168                  IGNORE_RANGE, \
4169                  IGNORE_CONSTRAINT, \
4170                  IGNORE_WRITEABLE)
4171 
4172 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4173            DECLARE_PRODUCT_FLAG, \
4174            DECLARE_DIAGNOSTIC_FLAG, \
4175            DECLARE_EXPERIMENTAL_FLAG, \
4176            DECLARE_NOTPRODUCT_FLAG, \
4177            IGNORE_RANGE, \
4178            IGNORE_CONSTRAINT, \
4179            IGNORE_WRITEABLE)
4180 
4181 // Extensions
4182 
4183 #include "runtime/globals_ext.hpp"
4184 
4185 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---