1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/align.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/macros.hpp"
  31 
  32 #include <float.h> // for DBL_MAX
  33 
  34 // The larger HeapWordSize for 64bit requires larger heaps
  35 // for the same application running in 64bit.  See bug 4967770.
  36 // The minimum alignment to a heap word size is done.  Other
  37 // parts of the memory system may require additional alignment
  38 // and are responsible for those alignments.
  39 #ifdef _LP64
  40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
  41 #else
  42 #define ScaleForWordSize(x) (x)
  43 #endif
  44 
  45 // use this for flags that are true per default in the tiered build
  46 // but false in non-tiered builds, and vice versa
  47 #ifdef TIERED
  48 #define  trueInTiered true
  49 #define falseInTiered false
  50 #else
  51 #define  trueInTiered false
  52 #define falseInTiered true
  53 #endif
  54 
  55 #include CPU_HEADER(globals)
  56 #include OS_HEADER(globals)
  57 #include OS_CPU_HEADER(globals)
  58 #ifdef COMPILER1
  59 #include CPU_HEADER(c1_globals)
  60 #include OS_HEADER(c1_globals)
  61 #endif
  62 #ifdef COMPILER2
  63 #include CPU_HEADER(c2_globals)
  64 #include OS_HEADER(c2_globals)
  65 #endif
  66 
  67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
  68 define_pd_global(bool, BackgroundCompilation,        false);
  69 define_pd_global(bool, UseTLAB,                      false);
  70 define_pd_global(bool, CICompileOSR,                 false);
  71 define_pd_global(bool, UseTypeProfile,               false);
  72 define_pd_global(bool, UseOnStackReplacement,        false);
  73 define_pd_global(bool, InlineIntrinsics,             false);
  74 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  75 define_pd_global(bool, ProfileInterpreter,           false);
  76 define_pd_global(bool, ProfileTraps,                 false);
  77 define_pd_global(bool, TieredCompilation,            false);
  78 
  79 define_pd_global(intx, CompileThreshold,             0);
  80 
  81 define_pd_global(intx, OnStackReplacePercentage,     0);
  82 define_pd_global(bool, ResizeTLAB,                   false);
  83 define_pd_global(intx, FreqInlineSize,               0);
  84 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  85 define_pd_global(intx, InlineClassNatives,           true);
  86 define_pd_global(intx, InlineUnsafeOps,              true);
  87 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  88 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  89 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
  90 define_pd_global(intx, ProfiledCodeHeapSize,         0);
  91 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
  92 
  93 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  94 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  95 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
  96 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  97 define_pd_global(bool, NeverActAsServerClassMachine, true);
  98 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
  99 #define CI_COMPILER_COUNT 0
 100 #else
 101 
 102 #if defined(COMPILER2) || INCLUDE_JVMCI
 103 #define CI_COMPILER_COUNT 2
 104 #else
 105 #define CI_COMPILER_COUNT 1
 106 #endif // COMPILER2 || INCLUDE_JVMCI
 107 
 108 #endif // no compilers
 109 
 110 // string type aliases used only in this file
 111 typedef const char* ccstr;
 112 typedef const char* ccstrlist;   // represents string arguments which accumulate
 113 
 114 // function type that will construct default range string
 115 typedef const char* (*RangeStrFunc)(void);
 116 
 117 struct Flag {
 118   enum Flags {
 119     // latest value origin
 120     DEFAULT          = 0,
 121     COMMAND_LINE     = 1,
 122     ENVIRON_VAR      = 2,
 123     CONFIG_FILE      = 3,
 124     MANAGEMENT       = 4,
 125     ERGONOMIC        = 5,
 126     ATTACH_ON_DEMAND = 6,
 127     INTERNAL         = 7,
 128 
 129     LAST_VALUE_ORIGIN = INTERNAL,
 130     VALUE_ORIGIN_BITS = 4,
 131     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 132 
 133     // flag kind
 134     KIND_PRODUCT            = 1 << 4,
 135     KIND_MANAGEABLE         = 1 << 5,
 136     KIND_DIAGNOSTIC         = 1 << 6,
 137     KIND_EXPERIMENTAL       = 1 << 7,
 138     KIND_NOT_PRODUCT        = 1 << 8,
 139     KIND_DEVELOP            = 1 << 9,
 140     KIND_PLATFORM_DEPENDENT = 1 << 10,
 141     KIND_READ_WRITE         = 1 << 11,
 142     KIND_C1                 = 1 << 12,
 143     KIND_C2                 = 1 << 13,
 144     KIND_ARCH               = 1 << 14,
 145     KIND_LP64_PRODUCT       = 1 << 15,
 146     KIND_COMMERCIAL         = 1 << 16,
 147     KIND_JVMCI              = 1 << 17,
 148 
 149     // set this bit if the flag was set on the command line
 150     ORIG_COMMAND_LINE       = 1 << 18,
 151 
 152     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 153   };
 154 
 155   enum Error {
 156     // no error
 157     SUCCESS = 0,
 158     // flag name is missing
 159     MISSING_NAME,
 160     // flag value is missing
 161     MISSING_VALUE,
 162     // error parsing the textual form of the value
 163     WRONG_FORMAT,
 164     // flag is not writable
 165     NON_WRITABLE,
 166     // flag value is outside of its bounds
 167     OUT_OF_BOUNDS,
 168     // flag value violates its constraint
 169     VIOLATES_CONSTRAINT,
 170     // there is no flag with the given name
 171     INVALID_FLAG,
 172     // the flag can only be set only on command line during invocation of the VM
 173     COMMAND_LINE_ONLY,
 174     // the flag may only be set once
 175     SET_ONLY_ONCE,
 176     // the flag is not writable in this combination of product/debug build
 177     CONSTANT,
 178     // other, unspecified error related to setting the flag
 179     ERR_OTHER
 180   };
 181 
 182   enum MsgType {
 183     NONE = 0,
 184     DIAGNOSTIC_FLAG_BUT_LOCKED,
 185     EXPERIMENTAL_FLAG_BUT_LOCKED,
 186     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 187     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 188   };
 189 
 190   const char* _type;
 191   const char* _name;
 192   void* _addr;
 193   NOT_PRODUCT(const char* _doc;)
 194   Flags _flags;
 195   size_t _name_len;
 196 
 197   // points to all Flags static array
 198   static Flag* flags;
 199 
 200   // number of flags
 201   static size_t numFlags;
 202 
 203   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 204   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 205   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 206 
 207   static const char* get_int_default_range_str();
 208   static const char* get_uint_default_range_str();
 209   static const char* get_intx_default_range_str();
 210   static const char* get_uintx_default_range_str();
 211   static const char* get_uint64_t_default_range_str();
 212   static const char* get_size_t_default_range_str();
 213   static const char* get_double_default_range_str();
 214 
 215   Flag::Error check_writable(bool changed);
 216 
 217   bool is_bool() const;
 218   bool get_bool() const;
 219   Flag::Error set_bool(bool value);
 220 
 221   bool is_int() const;
 222   int get_int() const;
 223   Flag::Error set_int(int value);
 224 
 225   bool is_uint() const;
 226   uint get_uint() const;
 227   Flag::Error set_uint(uint value);
 228 
 229   bool is_intx() const;
 230   intx get_intx() const;
 231   Flag::Error set_intx(intx value);
 232 
 233   bool is_uintx() const;
 234   uintx get_uintx() const;
 235   Flag::Error set_uintx(uintx value);
 236 
 237   bool is_uint64_t() const;
 238   uint64_t get_uint64_t() const;
 239   Flag::Error set_uint64_t(uint64_t value);
 240 
 241   bool is_size_t() const;
 242   size_t get_size_t() const;
 243   Flag::Error set_size_t(size_t value);
 244 
 245   bool is_double() const;
 246   double get_double() const;
 247   Flag::Error set_double(double value);
 248 
 249   bool is_ccstr() const;
 250   bool ccstr_accumulates() const;
 251   ccstr get_ccstr() const;
 252   Flag::Error set_ccstr(ccstr value);
 253 
 254   Flags get_origin();
 255   void set_origin(Flags origin);
 256 
 257   size_t get_name_length();
 258 
 259   bool is_default();
 260   bool is_ergonomic();
 261   bool is_command_line();
 262   void set_command_line();
 263 
 264   bool is_product() const;
 265   bool is_manageable() const;
 266   bool is_diagnostic() const;
 267   bool is_experimental() const;
 268   bool is_notproduct() const;
 269   bool is_develop() const;
 270   bool is_read_write() const;
 271   bool is_commercial() const;
 272 
 273   bool is_constant_in_binary() const;
 274 
 275   bool is_unlocker() const;
 276   bool is_unlocked() const;
 277   bool is_writeable() const;
 278   bool is_external() const;
 279 
 280   bool is_unlocker_ext() const;
 281   bool is_unlocked_ext() const;
 282   bool is_writeable_ext() const;
 283   bool is_external_ext() const;
 284 
 285   void clear_diagnostic();
 286 
 287   Flag::MsgType get_locked_message(char*, int) const;
 288   void get_locked_message_ext(char*, int) const;
 289 
 290   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 291   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 292   void print_kind_and_origin(outputStream* st);
 293   void print_as_flag(outputStream* st);
 294 
 295   static const char* flag_error_str(Flag::Error error);
 296 };
 297 
 298 // debug flags control various aspects of the VM and are global accessible
 299 
 300 // use FlagSetting to temporarily change some debug flag
 301 // e.g. FlagSetting fs(DebugThisAndThat, true);
 302 // restored to previous value upon leaving scope
 303 class FlagSetting {
 304   bool val;
 305   bool* flag;
 306  public:
 307   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 308   ~FlagSetting()                       { *flag = val; }
 309 };
 310 
 311 
 312 class CounterSetting {
 313   intx* counter;
 314  public:
 315   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 316   ~CounterSetting()         { (*counter)--; }
 317 };
 318 
 319 class IntFlagSetting {
 320   int val;
 321   int* flag;
 322  public:
 323   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 324   ~IntFlagSetting()                     { *flag = val; }
 325 };
 326 
 327 class UIntFlagSetting {
 328   uint val;
 329   uint* flag;
 330  public:
 331   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 332   ~UIntFlagSetting()                       { *flag = val; }
 333 };
 334 
 335 class UIntXFlagSetting {
 336   uintx val;
 337   uintx* flag;
 338  public:
 339   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 340   ~UIntXFlagSetting()                         { *flag = val; }
 341 };
 342 
 343 class DoubleFlagSetting {
 344   double val;
 345   double* flag;
 346  public:
 347   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 348   ~DoubleFlagSetting()                           { *flag = val; }
 349 };
 350 
 351 class SizeTFlagSetting {
 352   size_t val;
 353   size_t* flag;
 354  public:
 355   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 356   ~SizeTFlagSetting()                           { *flag = val; }
 357 };
 358 
 359 // Helper class for temporarily saving the value of a flag during a scope.
 360 template <size_t SIZE>
 361 class FlagGuard {
 362   unsigned char _value[SIZE];
 363   void* const _addr;
 364 
 365   // Hide operator new, this class should only be allocated on the stack.
 366   // NOTE: Cannot include memory/allocation.hpp here due to circular
 367   //       dependencies.
 368   void* operator new(size_t size) throw();
 369   void* operator new [](size_t size) throw();
 370 
 371  public:
 372   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 373     memcpy(_value, _addr, SIZE);
 374   }
 375 
 376   ~FlagGuard() {
 377     memcpy(_addr, _value, SIZE);
 378   }
 379 };
 380 
 381 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 382 
 383 class CommandLineFlags {
 384 public:
 385   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 386   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); }
 387   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 388   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 389   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 390 
 391   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 392   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); }
 393   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 394   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 395   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 396 
 397   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 398   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); }
 399   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 400   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 401   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 402 
 403   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 404   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); }
 405   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 406   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 407   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 408 
 409   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 410   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); }
 411   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 412   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 413   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 414 
 415   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 416   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); }
 417   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 418   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 419   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 420 
 421   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 422   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); }
 423   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 424   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 425   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 426 
 427   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 428   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); }
 429   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 430   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 431   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 432 
 433   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 434   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); }
 435   // Contract:  Flag will make private copy of the incoming value.
 436   // Outgoing value is always malloc-ed, and caller MUST call free.
 437   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 438   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 439 
 440   // Returns false if name is not a command line flag.
 441   static bool wasSetOnCmdline(const char* name, bool* value);
 442   static void printSetFlags(outputStream* out);
 443 
 444   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 445   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 446 
 447   static void verify() PRODUCT_RETURN;
 448 };
 449 
 450 // use this for flags that are true by default in the debug version but
 451 // false in the optimized version, and vice versa
 452 #ifdef ASSERT
 453 #define trueInDebug  true
 454 #define falseInDebug false
 455 #else
 456 #define trueInDebug  false
 457 #define falseInDebug true
 458 #endif
 459 
 460 // use this for flags that are true per default in the product build
 461 // but false in development builds, and vice versa
 462 #ifdef PRODUCT
 463 #define trueInProduct  true
 464 #define falseInProduct false
 465 #else
 466 #define trueInProduct  false
 467 #define falseInProduct true
 468 #endif
 469 
 470 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 471 // product flags are always settable / visible
 472 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 473 
 474 // A flag must be declared with one of the following types:
 475 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 476 // The type "ccstr" is an alias for "const char*" and is used
 477 // only in this file, because the macrology requires single-token type names.
 478 
 479 // Note: Diagnostic options not meant for VM tuning or for product modes.
 480 // They are to be used for VM quality assurance or field diagnosis
 481 // of VM bugs.  They are hidden so that users will not be encouraged to
 482 // try them as if they were VM ordinary execution options.  However, they
 483 // are available in the product version of the VM.  Under instruction
 484 // from support engineers, VM customers can turn them on to collect
 485 // diagnostic information about VM problems.  To use a VM diagnostic
 486 // option, you must first specify +UnlockDiagnosticVMOptions.
 487 // (This master switch also affects the behavior of -Xprintflags.)
 488 //
 489 // experimental flags are in support of features that are not
 490 //    part of the officially supported product, but are available
 491 //    for experimenting with. They could, for example, be performance
 492 //    features that may not have undergone full or rigorous QA, but which may
 493 //    help performance in some cases and released for experimentation
 494 //    by the community of users and developers. This flag also allows one to
 495 //    be able to build a fully supported product that nonetheless also
 496 //    ships with some unsupported, lightly tested, experimental features.
 497 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 498 //    UnlockExperimentalVMOptions flag, which allows the control and
 499 //    modification of the experimental flags.
 500 //
 501 // Nota bene: neither diagnostic nor experimental options should be used casually,
 502 //    and they are not supported on production loads, except under explicit
 503 //    direction from support engineers.
 504 //
 505 // manageable flags are writeable external product flags.
 506 //    They are dynamically writeable through the JDK management interface
 507 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 508 //    These flags are external exported interface (see CCC).  The list of
 509 //    manageable flags can be queried programmatically through the management
 510 //    interface.
 511 //
 512 //    A flag can be made as "manageable" only if
 513 //    - the flag is defined in a CCC as an external exported interface.
 514 //    - the VM implementation supports dynamic setting of the flag.
 515 //      This implies that the VM must *always* query the flag variable
 516 //      and not reuse state related to the flag state at any given time.
 517 //    - you want the flag to be queried programmatically by the customers.
 518 //
 519 // product_rw flags are writeable internal product flags.
 520 //    They are like "manageable" flags but for internal/private use.
 521 //    The list of product_rw flags are internal/private flags which
 522 //    may be changed/removed in a future release.  It can be set
 523 //    through the management interface to get/set value
 524 //    when the name of flag is supplied.
 525 //
 526 //    A flag can be made as "product_rw" only if
 527 //    - the VM implementation supports dynamic setting of the flag.
 528 //      This implies that the VM must *always* query the flag variable
 529 //      and not reuse state related to the flag state at any given time.
 530 //
 531 // Note that when there is a need to support develop flags to be writeable,
 532 // it can be done in the same way as product_rw.
 533 //
 534 // range is a macro that will expand to min and max arguments for range
 535 //    checking code if provided - see commandLineFlagRangeList.hpp
 536 //
 537 // constraint is a macro that will expand to custom function call
 538 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 539 //
 540 // writeable is a macro that controls if and how the value can change during the runtime
 541 //
 542 // writeable(Always) is optional and allows the flag to have its value changed
 543 //    without any limitations at any time
 544 //
 545 // writeable(Once) flag value's can be only set once during the lifetime of VM
 546 //
 547 // writeable(CommandLineOnly) flag value's can be only set from command line
 548 //    (multiple times allowed)
 549 //
 550 
 551 
 552 #define RUNTIME_FLAGS(develop, \
 553                       develop_pd, \
 554                       product, \
 555                       product_pd, \
 556                       diagnostic, \
 557                       diagnostic_pd, \
 558                       experimental, \
 559                       notproduct, \
 560                       manageable, \
 561                       product_rw, \
 562                       lp64_product, \
 563                       range, \
 564                       constraint, \
 565                       writeable) \
 566                                                                             \
 567   lp64_product(bool, UseCompressedOops, false,                              \
 568           "Use 32-bit object references in 64-bit VM. "                     \
 569           "lp64_product means flag is always constant in 32 bit VM")        \
 570                                                                             \
 571   lp64_product(bool, UseCompressedClassPointers, false,                     \
 572           "Use 32-bit class pointers in 64-bit VM. "                        \
 573           "lp64_product means flag is always constant in 32 bit VM")        \
 574                                                                             \
 575   notproduct(bool, CheckCompressedOops, true,                               \
 576           "Generate checks in encoding/decoding code in debug VM")          \
 577                                                                             \
 578   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 579           "Heap allocation steps through preferred address regions to find" \
 580           " where it can allocate the heap. Number of steps to take per "   \
 581           "region.")                                                        \
 582           range(1, max_uintx)                                               \
 583                                                                             \
 584   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 585           "Default object alignment in bytes, 8 is minimum")                \
 586           range(8, 256)                                                     \
 587           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 588                                                                             \
 589   product(bool, AssumeMP, true,                                             \
 590           "(Deprecated) Instruct the VM to assume multiple processors are available")\
 591                                                                             \
 592   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 593   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 594   /* been re-added (see 6401008)                                         */ \
 595   product_pd(bool, UseMembar,                                               \
 596           "(Unstable) Issues membars on thread state transitions")          \
 597                                                                             \
 598   develop(bool, CleanChunkPoolAsync, true,                                  \
 599           "Clean the chunk pool asynchronously")                            \
 600                                                                             \
 601   experimental(bool, AlwaysSafeConstructors, false,                         \
 602           "Force safe construction, as if all fields are final.")           \
 603                                                                             \
 604   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 605           "Enable normal processing of flags relating to field diagnostics")\
 606                                                                             \
 607   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 608           "Enable normal processing of flags relating to experimental "     \
 609           "features")                                                       \
 610                                                                             \
 611   product(bool, JavaMonitorsInStackTrace, true,                             \
 612           "Print information about Java monitor locks when the stacks are"  \
 613           "dumped")                                                         \
 614                                                                             \
 615   product_pd(bool, UseLargePages,                                           \
 616           "Use large page memory")                                          \
 617                                                                             \
 618   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 619           "Allocate large pages individually for better affinity")          \
 620                                                                             \
 621   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 622           "Fail large pages individual allocation")                         \
 623                                                                             \
 624   product(bool, UseLargePagesInMetaspace, false,                            \
 625           "Use large page memory in metaspace. "                            \
 626           "Only used if UseLargePages is enabled.")                         \
 627                                                                             \
 628   product(bool, UseNUMA, false,                                             \
 629           "Use NUMA if available")                                          \
 630                                                                             \
 631   product(bool, UseNUMAInterleaving, false,                                 \
 632           "Interleave memory across NUMA nodes if available")               \
 633                                                                             \
 634   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 635           "Granularity to use for NUMA interleaving on Windows OS")         \
 636           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 637                                                                             \
 638   product(bool, ForceNUMA, false,                                           \
 639           "Force NUMA optimizations on single-node/UMA systems")            \
 640                                                                             \
 641   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 642           "Percentage (0-100) used to weight the current sample when "      \
 643           "computing exponentially decaying average for "                   \
 644           "AdaptiveNUMAChunkSizing")                                        \
 645           range(0, 100)                                                     \
 646                                                                             \
 647   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 648           "Do not reallocate more than this amount per collection")         \
 649           range(0, max_uintx)                                               \
 650                                                                             \
 651   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 652           "Enable adaptive chunk sizing for NUMA")                          \
 653                                                                             \
 654   product(bool, NUMAStats, false,                                           \
 655           "Print NUMA stats in detailed heap information")                  \
 656                                                                             \
 657   product(uintx, NUMAPageScanRate, 256,                                     \
 658           "Maximum number of pages to include in the page scan procedure")  \
 659           range(0, max_uintx)                                               \
 660                                                                             \
 661   product_pd(bool, NeedsDeoptSuspend,                                       \
 662           "True for register window machines (sparc/ia64)")                 \
 663                                                                             \
 664   product(intx, UseSSE, 99,                                                 \
 665           "Highest supported SSE instructions set on x86/x64")              \
 666           range(0, 99)                                                      \
 667                                                                             \
 668   product(bool, UseAES, false,                                              \
 669           "Control whether AES instructions are used when available")       \
 670                                                                             \
 671   product(bool, UseFMA, false,                                              \
 672           "Control whether FMA instructions are used when available")       \
 673                                                                             \
 674   product(bool, UseSHA, false,                                              \
 675           "Control whether SHA instructions are used when available")       \
 676                                                                             \
 677   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 678           "Use intrinsics for GHASH versions of crypto")                    \
 679                                                                             \
 680   product(size_t, LargePageSizeInBytes, 0,                                  \
 681           "Large page size (0 to let VM choose the page size)")             \
 682           range(0, max_uintx)                                               \
 683                                                                             \
 684   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 685           "Use large pages if maximum heap is at least this big")           \
 686           range(0, max_uintx)                                               \
 687                                                                             \
 688   product(bool, ForceTimeHighResolution, false,                             \
 689           "Using high time resolution (for Win32 only)")                    \
 690                                                                             \
 691   develop(bool, TracePcPatching, false,                                     \
 692           "Trace usage of frame::patch_pc")                                 \
 693                                                                             \
 694   develop(bool, TraceRelocator, false,                                      \
 695           "Trace the bytecode relocator")                                   \
 696                                                                             \
 697   develop(bool, TraceLongCompiles, false,                                   \
 698           "Print out every time compilation is longer than "                \
 699           "a given threshold")                                              \
 700                                                                             \
 701   develop(bool, SafepointALot, false,                                       \
 702           "Generate a lot of safepoints. This works with "                  \
 703           "GuaranteedSafepointInterval")                                    \
 704                                                                             \
 705   product_pd(bool, BackgroundCompilation,                                   \
 706           "A thread requesting compilation is not blocked during "          \
 707           "compilation")                                                    \
 708                                                                             \
 709   product(bool, PrintVMQWaitTime, false,                                    \
 710           "Print out the waiting time in VM operation queue")               \
 711                                                                             \
 712   product(bool, MethodFlushing, true,                                       \
 713           "Reclamation of zombie and not-entrant methods")                  \
 714                                                                             \
 715   develop(bool, VerifyStack, false,                                         \
 716           "Verify stack of each thread when it is entering a runtime call") \
 717                                                                             \
 718   diagnostic(bool, ForceUnreachable, false,                                 \
 719           "Make all non code cache addresses to be unreachable by "         \
 720           "forcing use of 64bit literal fixups")                            \
 721                                                                             \
 722   notproduct(bool, StressDerivedPointers, false,                            \
 723           "Force scavenge when a derived pointer is detected on stack "     \
 724           "after rtm call")                                                 \
 725                                                                             \
 726   develop(bool, TraceDerivedPointers, false,                                \
 727           "Trace traversal of derived pointers on stack")                   \
 728                                                                             \
 729   notproduct(bool, TraceCodeBlobStacks, false,                              \
 730           "Trace stack-walk of codeblobs")                                  \
 731                                                                             \
 732   product(bool, PrintJNIResolving, false,                                   \
 733           "Used to implement -v:jni")                                       \
 734                                                                             \
 735   notproduct(bool, PrintRewrites, false,                                    \
 736           "Print methods that are being rewritten")                         \
 737                                                                             \
 738   product(bool, UseInlineCaches, true,                                      \
 739           "Use Inline Caches for virtual calls ")                           \
 740                                                                             \
 741   diagnostic(bool, InlineArrayCopy, true,                                   \
 742           "Inline arraycopy native that is known to be part of "            \
 743           "base library DLL")                                               \
 744                                                                             \
 745   diagnostic(bool, InlineObjectHash, true,                                  \
 746           "Inline Object::hashCode() native that is known to be part "      \
 747           "of base library DLL")                                            \
 748                                                                             \
 749   diagnostic(bool, InlineNatives, true,                                     \
 750           "Inline natives that are known to be part of base library DLL")   \
 751                                                                             \
 752   diagnostic(bool, InlineMathNatives, true,                                 \
 753           "Inline SinD, CosD, etc.")                                        \
 754                                                                             \
 755   diagnostic(bool, InlineClassNatives, true,                                \
 756           "Inline Class.isInstance, etc")                                   \
 757                                                                             \
 758   diagnostic(bool, InlineThreadNatives, true,                               \
 759           "Inline Thread.currentThread, etc")                               \
 760                                                                             \
 761   diagnostic(bool, InlineUnsafeOps, true,                                   \
 762           "Inline memory ops (native methods) from Unsafe")                 \
 763                                                                             \
 764   product(bool, CriticalJNINatives, true,                                   \
 765           "Check for critical JNI entry points")                            \
 766                                                                             \
 767   notproduct(bool, StressCriticalJNINatives, false,                         \
 768           "Exercise register saving code in critical natives")              \
 769                                                                             \
 770   diagnostic(bool, UseAESIntrinsics, false,                                 \
 771           "Use intrinsics for AES versions of crypto")                      \
 772                                                                             \
 773   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 774           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 775                                                                             \
 776   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 777           "Use intrinsics for SHA-1 crypto hash function. "                 \
 778           "Requires that UseSHA is enabled.")                               \
 779                                                                             \
 780   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 781           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 782           "Requires that UseSHA is enabled.")                               \
 783                                                                             \
 784   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 785           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 786           "Requires that UseSHA is enabled.")                               \
 787                                                                             \
 788   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 789           "use intrinsics for java.util.zip.CRC32")                         \
 790                                                                             \
 791   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 792           "use intrinsics for java.util.zip.CRC32C")                        \
 793                                                                             \
 794   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 795           "use intrinsics for java.util.zip.Adler32")                       \
 796                                                                             \
 797   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 798           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 799                                                                             \
 800   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 801          "do not expand intrinsics whose (internal) names appear here")     \
 802                                                                             \
 803   develop(bool, TraceCallFixup, false,                                      \
 804           "Trace all call fixups")                                          \
 805                                                                             \
 806   develop(bool, DeoptimizeALot, false,                                      \
 807           "Deoptimize at every exit from the runtime system")               \
 808                                                                             \
 809   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 810           "A comma separated list of bcis to deoptimize at")                \
 811                                                                             \
 812   product(bool, DeoptimizeRandom, false,                                    \
 813           "Deoptimize random frames on random exit from the runtime system")\
 814                                                                             \
 815   notproduct(bool, ZombieALot, false,                                       \
 816           "Create zombies (non-entrant) at exit from the runtime system")   \
 817                                                                             \
 818   product(bool, UnlinkSymbolsALot, false,                                   \
 819           "Unlink unreferenced symbols from the symbol table at safepoints")\
 820                                                                             \
 821   notproduct(bool, WalkStackALot, false,                                    \
 822           "Trace stack (no print) at every exit from the runtime system")   \
 823                                                                             \
 824   product(bool, Debugging, false,                                           \
 825           "Set when executing debug methods in debug.cpp "                  \
 826           "(to prevent triggering assertions)")                             \
 827                                                                             \
 828   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 829           "Enable strict checks that safepoints cannot happen for threads " \
 830           "that use NoSafepointVerifier")                                   \
 831                                                                             \
 832   notproduct(bool, VerifyLastFrame, false,                                  \
 833           "Verify oops on last frame on entry to VM")                       \
 834                                                                             \
 835   product(bool, FailOverToOldVerifier, true,                                \
 836           "Fail over to old verifier when split verifier fails")            \
 837                                                                             \
 838   develop(bool, ShowSafepointMsgs, false,                                   \
 839           "Show message about safepoint synchronization")                   \
 840                                                                             \
 841   product(bool, SafepointTimeout, false,                                    \
 842           "Time out and warn or fail after SafepointTimeoutDelay "          \
 843           "milliseconds if failed to reach safepoint")                      \
 844                                                                             \
 845   develop(bool, DieOnSafepointTimeout, false,                               \
 846           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 847                                                                             \
 848   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 849   /* typically, at most a few retries are needed                    */      \
 850   product(intx, SuspendRetryCount, 50,                                      \
 851           "Maximum retry count for an external suspend request")            \
 852           range(0, max_intx)                                                \
 853                                                                             \
 854   product(intx, SuspendRetryDelay, 5,                                       \
 855           "Milliseconds to delay per retry (* current_retry_count)")        \
 856           range(0, max_intx)                                                \
 857                                                                             \
 858   product(bool, AssertOnSuspendWaitFailure, false,                          \
 859           "Assert/Guarantee on external suspend wait failure")              \
 860                                                                             \
 861   product(bool, TraceSuspendWaitFailures, false,                            \
 862           "Trace external suspend wait failures")                           \
 863                                                                             \
 864   product(bool, MaxFDLimit, true,                                           \
 865           "Bump the number of file descriptors to maximum in Solaris")      \
 866                                                                             \
 867   diagnostic(bool, LogEvents, true,                                         \
 868           "Enable the various ring buffer event logs")                      \
 869                                                                             \
 870   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 871           "Number of ring buffer event logs")                               \
 872           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 873                                                                             \
 874   product(bool, BytecodeVerificationRemote, true,                           \
 875           "Enable the Java bytecode verifier for remote classes")           \
 876                                                                             \
 877   product(bool, BytecodeVerificationLocal, false,                           \
 878           "Enable the Java bytecode verifier for local classes")            \
 879                                                                             \
 880   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 881           "Force exceptions on FP stack under/overflow")                    \
 882                                                                             \
 883   develop(bool, VerifyStackAtCalls, false,                                  \
 884           "Verify that the stack pointer is unchanged after calls")         \
 885                                                                             \
 886   develop(bool, TraceJavaAssertions, false,                                 \
 887           "Trace java language assertions")                                 \
 888                                                                             \
 889   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 890           "Temporary - see javaClasses.cpp")                                \
 891                                                                             \
 892   notproduct(bool, PrintMallocFree, false,                                  \
 893           "Trace calls to C heap malloc/free allocation")                   \
 894                                                                             \
 895   notproduct(bool, VerifyCodeCache, false,                                  \
 896           "Verify code cache on memory allocation/deallocation")            \
 897                                                                             \
 898   develop(bool, UseMallocOnly, false,                                       \
 899           "Use only malloc/free for allocation (no resource area/arena)")   \
 900                                                                             \
 901   develop(bool, PrintMalloc, false,                                         \
 902           "Print all malloc/free calls")                                    \
 903                                                                             \
 904   develop(bool, PrintMallocStatistics, false,                               \
 905           "Print malloc/free statistics")                                   \
 906                                                                             \
 907   develop(bool, ZapResourceArea, trueInDebug,                               \
 908           "Zap freed resource/arena space with 0xABABABAB")                 \
 909                                                                             \
 910   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 911           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 912                                                                             \
 913   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 914           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 915                                                                             \
 916   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 917           "Zap allocated/freed stack segments with 0xFADFADED")             \
 918                                                                             \
 919   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 920           "Zap unused heap space with 0xBAADBABE")                          \
 921                                                                             \
 922   develop(bool, CheckZapUnusedHeapArea, false,                              \
 923           "Check zapping of unused heap space")                             \
 924                                                                             \
 925   develop(bool, ZapFillerObjects, trueInDebug,                              \
 926           "Zap filler objects with 0xDEAFBABE")                             \
 927                                                                             \
 928   develop(bool, PrintVMMessages, true,                                      \
 929           "Print VM messages on console")                                   \
 930                                                                             \
 931   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 932           "If > 0, provokes an error after VM initialization; the value "   \
 933           "determines which error to provoke. See test_error_handler() "    \
 934           "in vmError.cpp.")                                                \
 935                                                                             \
 936   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 937           "If > 0, provokes an error inside VM error handler (a secondary " \
 938           "crash). see test_error_handler() in vmError.cpp")                \
 939                                                                             \
 940   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 941           "If true, tests SafeFetch inside error handler.")                 \
 942                                                                             \
 943   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 944           "If true, simulates an unresponsive error handler.")              \
 945                                                                             \
 946   develop(bool, Verbose, false,                                             \
 947           "Print additional debugging information from other modes")        \
 948                                                                             \
 949   develop(bool, PrintMiscellaneous, false,                                  \
 950           "Print uncategorized debugging information (requires +Verbose)")  \
 951                                                                             \
 952   develop(bool, WizardMode, false,                                          \
 953           "Print much more debugging information")                          \
 954                                                                             \
 955   product(bool, ShowMessageBoxOnError, false,                               \
 956           "Keep process alive on VM fatal error")                           \
 957                                                                             \
 958   product(bool, CreateCoredumpOnCrash, true,                                \
 959           "Create core/mini dump on VM fatal error")                        \
 960                                                                             \
 961   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 962           "Timeout, in seconds, to limit the time spent on writing an "     \
 963           "error log in case of a crash.")                                  \
 964           range(0, (uint64_t)max_jlong/1000)                                \
 965                                                                             \
 966   product_pd(bool, UseOSErrorReporting,                                     \
 967           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 968                                                                             \
 969   product(bool, SuppressFatalErrorMessage, false,                           \
 970           "Report NO fatal error message (avoid deadlock)")                 \
 971                                                                             \
 972   product(ccstrlist, OnError, "",                                           \
 973           "Run user-defined commands on fatal error; see VMError.cpp "      \
 974           "for examples")                                                   \
 975                                                                             \
 976   product(ccstrlist, OnOutOfMemoryError, "",                                \
 977           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 978                                                                             \
 979   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 980           "Dump heap to file before any major stop-the-world GC")           \
 981                                                                             \
 982   manageable(bool, HeapDumpAfterFullGC, false,                              \
 983           "Dump heap to file after any major stop-the-world GC")            \
 984                                                                             \
 985   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 986           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 987                                                                             \
 988   manageable(ccstr, HeapDumpPath, NULL,                                     \
 989           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 990           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 991           "in the working directory)")                                      \
 992                                                                             \
 993   develop(bool, BreakAtWarning, false,                                      \
 994           "Execute breakpoint upon encountering VM warning")                \
 995                                                                             \
 996   develop(bool, UseFakeTimers, false,                                       \
 997           "Tell whether the VM should use system time or a fake timer")     \
 998                                                                             \
 999   product(ccstr, NativeMemoryTracking, "off",                               \
1000           "Native memory tracking options")                                 \
1001                                                                             \
1002   diagnostic(bool, PrintNMTStatistics, false,                               \
1003           "Print native memory tracking summary data if it is on")          \
1004                                                                             \
1005   diagnostic(bool, LogCompilation, false,                                   \
1006           "Log compilation activity in detail to LogFile")                  \
1007                                                                             \
1008   product(bool, PrintCompilation, false,                                    \
1009           "Print compilations")                                             \
1010                                                                             \
1011   diagnostic(bool, TraceNMethodInstalls, false,                             \
1012           "Trace nmethod installation")                                     \
1013                                                                             \
1014   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1015           "0: do not allow scavengable oops in the code cache; "            \
1016           "1: allow scavenging from the code cache; "                       \
1017           "2: emit as many constants as the compiler can see")              \
1018           range(0, 2)                                                       \
1019                                                                             \
1020   product(bool, AlwaysRestoreFPU, false,                                    \
1021           "Restore the FPU control word after every JNI call (expensive)")  \
1022                                                                             \
1023   diagnostic(bool, PrintCompilation2, false,                                \
1024           "Print additional statistics per compilation")                    \
1025                                                                             \
1026   diagnostic(bool, PrintAdapterHandlers, false,                             \
1027           "Print code generated for i2c/c2i adapters")                      \
1028                                                                             \
1029   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1030           "Verify that i2c/c2i adapters are called properly")               \
1031                                                                             \
1032   develop(bool, VerifyAdapterSharing, false,                                \
1033           "Verify that the code for shared adapters is the equivalent")     \
1034                                                                             \
1035   diagnostic(bool, PrintAssembly, false,                                    \
1036           "Print assembly code (using external disassembler.so)")           \
1037                                                                             \
1038   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1039           "Print options string passed to disassembler.so")                 \
1040                                                                             \
1041   notproduct(bool, PrintNMethodStatistics, false,                           \
1042           "Print a summary statistic for the generated nmethods")           \
1043                                                                             \
1044   diagnostic(bool, PrintNMethods, false,                                    \
1045           "Print assembly code for nmethods when generated")                \
1046                                                                             \
1047   diagnostic(bool, PrintNativeNMethods, false,                              \
1048           "Print assembly code for native nmethods when generated")         \
1049                                                                             \
1050   develop(bool, PrintDebugInfo, false,                                      \
1051           "Print debug information for all nmethods when generated")        \
1052                                                                             \
1053   develop(bool, PrintRelocations, false,                                    \
1054           "Print relocation information for all nmethods when generated")   \
1055                                                                             \
1056   develop(bool, PrintDependencies, false,                                   \
1057           "Print dependency information for all nmethods when generated")   \
1058                                                                             \
1059   develop(bool, PrintExceptionHandlers, false,                              \
1060           "Print exception handler tables for all nmethods when generated") \
1061                                                                             \
1062   develop(bool, StressCompiledExceptionHandlers, false,                     \
1063           "Exercise compiled exception handlers")                           \
1064                                                                             \
1065   develop(bool, InterceptOSException, false,                                \
1066           "Start debugger when an implicit OS (e.g. NULL) "                 \
1067           "exception happens")                                              \
1068                                                                             \
1069   product(bool, PrintCodeCache, false,                                      \
1070           "Print the code cache memory usage when exiting")                 \
1071                                                                             \
1072   develop(bool, PrintCodeCache2, false,                                     \
1073           "Print detailed usage information on the code cache when exiting")\
1074                                                                             \
1075   product(bool, PrintCodeCacheOnCompilation, false,                         \
1076           "Print the code cache memory usage each time a method is "        \
1077           "compiled")                                                       \
1078                                                                             \
1079   diagnostic(bool, PrintStubCode, false,                                    \
1080           "Print generated stub code")                                      \
1081                                                                             \
1082   product(bool, StackTraceInThrowable, true,                                \
1083           "Collect backtrace in throwable when exception happens")          \
1084                                                                             \
1085   product(bool, OmitStackTraceInFastThrow, true,                            \
1086           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1087                                                                             \
1088   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1089           "Print bytecode statistics when dumping profiler output")         \
1090                                                                             \
1091   product(bool, ProfilerRecordPC, false,                                    \
1092           "Collect ticks for each 16 byte interval of compiled code")       \
1093                                                                             \
1094   product(bool, ProfileVM, false,                                           \
1095           "Profile ticks that fall within VM (either in the VM Thread "     \
1096           "or VM code called through stubs)")                               \
1097                                                                             \
1098   product(bool, ProfileIntervals, false,                                    \
1099           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1100                                                                             \
1101   notproduct(bool, ProfilerCheckIntervals, false,                           \
1102           "Collect and print information on spacing of profiler ticks")     \
1103                                                                             \
1104   product(bool, PrintWarnings, true,                                        \
1105           "Print JVM warnings to output stream")                            \
1106                                                                             \
1107   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1108           "Print warnings for stalled SpinLocks")                           \
1109                                                                             \
1110   product(bool, RegisterFinalizersAtInit, true,                             \
1111           "Register finalizable objects at end of Object.<init> or "        \
1112           "after allocation")                                               \
1113                                                                             \
1114   develop(bool, RegisterReferences, true,                                   \
1115           "Tell whether the VM should register soft/weak/final/phantom "    \
1116           "references")                                                     \
1117                                                                             \
1118   develop(bool, IgnoreRewrites, false,                                      \
1119           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1120           "This is unsafe!")                                                \
1121                                                                             \
1122   develop(bool, PrintCodeCacheExtension, false,                             \
1123           "Print extension of code cache")                                  \
1124                                                                             \
1125   develop(bool, UsePrivilegedStack, true,                                   \
1126           "Enable the security JVM functions")                              \
1127                                                                             \
1128   develop(bool, ProtectionDomainVerification, true,                         \
1129           "Verify protection domain before resolution in system dictionary")\
1130                                                                             \
1131   product(bool, ClassUnloading, true,                                       \
1132           "Do unloading of classes")                                        \
1133                                                                             \
1134   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1135           "Do unloading of classes with a concurrent marking cycle")        \
1136                                                                             \
1137   develop(bool, DisableStartThread, false,                                  \
1138           "Disable starting of additional Java threads "                    \
1139           "(for debugging only)")                                           \
1140                                                                             \
1141   develop(bool, MemProfiling, false,                                        \
1142           "Write memory usage profiling to log file")                       \
1143                                                                             \
1144   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1145           "Print the system dictionary at exit")                            \
1146                                                                             \
1147   experimental(intx, PredictedLoadedClassCount, 0,                          \
1148           "Experimental: Tune loaded class cache starting size")            \
1149                                                                             \
1150   diagnostic(bool, UnsyncloadClass, false,                                  \
1151           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1152           "class loader must call VM synchronized for findClass "           \
1153           "and defineClass.")                                               \
1154                                                                             \
1155   product(bool, AlwaysLockClassLoader, false,                               \
1156           "Require the VM to acquire the class loader lock before calling " \
1157           "loadClass() even for class loaders registering "                 \
1158           "as parallel capable")                                            \
1159                                                                             \
1160   product(bool, AllowParallelDefineClass, false,                            \
1161           "Allow parallel defineClass requests for class loaders "          \
1162           "registering as parallel capable")                                \
1163                                                                             \
1164   product(bool, MustCallLoadClassInternal, false,                           \
1165           "Call loadClassInternal() rather than loadClass()")               \
1166                                                                             \
1167   product_pd(bool, DontYieldALot,                                           \
1168           "Throw away obvious excess yield calls")                          \
1169                                                                             \
1170   develop(bool, UseDetachedThreads, true,                                   \
1171           "Use detached threads that are recycled upon termination "        \
1172           "(for Solaris only)")                                             \
1173                                                                             \
1174   product(bool, UseLWPSynchronization, true,                                \
1175           "Use LWP-based instead of libthread-based synchronization "       \
1176           "(SPARC only)")                                                   \
1177                                                                             \
1178   experimental(ccstr, SyncKnobs, NULL,                                      \
1179                "(Unstable) Various monitor synchronization tunables")       \
1180                                                                             \
1181   experimental(intx, EmitSync, 0,                                           \
1182                "(Unsafe, Unstable) "                                        \
1183                "Control emission of inline sync fast-path code")            \
1184                                                                             \
1185   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1186           range(0, max_jint)                                                \
1187                                                                             \
1188   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1189                                                                             \
1190   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1191                 "Percentage of used monitors before triggering cleanup "    \
1192                 "safepoint which deflates monitors (0 is off). "            \
1193                 "The check is performed on GuaranteedSafepointInterval.")   \
1194                 range(0, 100)                                               \
1195                                                                             \
1196   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1197                "Experimental Sync flags")                                   \
1198                                                                             \
1199   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1200                                                                             \
1201   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1202                                                                             \
1203   experimental(intx, hashCode, 5,                                           \
1204                "(Unstable) select hashCode generation algorithm")           \
1205                                                                             \
1206   product(bool, FilterSpuriousWakeups, true,                                \
1207           "When true prevents OS-level spurious, or premature, wakeups "    \
1208           "from Object.wait (Ignored for Windows)")                         \
1209                                                                             \
1210   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1211                                                                             \
1212   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1213                                                                             \
1214   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1215                                                                             \
1216   develop(bool, UsePthreads, false,                                         \
1217           "Use pthread-based instead of libthread-based synchronization "   \
1218           "(SPARC only)")                                                   \
1219                                                                             \
1220   product(bool, ReduceSignalUsage, false,                                   \
1221           "Reduce the use of OS signals in Java and/or the VM")             \
1222                                                                             \
1223   develop_pd(bool, ShareVtableStubs,                                        \
1224           "Share vtable stubs (smaller code but worse branch prediction")   \
1225                                                                             \
1226   develop(bool, LoadLineNumberTables, true,                                 \
1227           "Tell whether the class file parser loads line number tables")    \
1228                                                                             \
1229   develop(bool, LoadLocalVariableTables, true,                              \
1230           "Tell whether the class file parser loads local variable tables") \
1231                                                                             \
1232   develop(bool, LoadLocalVariableTypeTables, true,                          \
1233           "Tell whether the class file parser loads local variable type"    \
1234           "tables")                                                         \
1235                                                                             \
1236   product(bool, AllowUserSignalHandlers, false,                             \
1237           "Do not complain if the application installs signal handlers "    \
1238           "(Solaris & Linux only)")                                         \
1239                                                                             \
1240   product(bool, UseSignalChaining, true,                                    \
1241           "Use signal-chaining to invoke signal handlers installed "        \
1242           "by the application (Solaris & Linux only)")                      \
1243                                                                             \
1244   product(bool, AllowJNIEnvProxy, false,                                    \
1245           "Allow JNIEnv proxies for jdbx")                                  \
1246                                                                             \
1247   product(bool, RestoreMXCSROnJNICalls, false,                              \
1248           "Restore MXCSR when returning from JNI calls")                    \
1249                                                                             \
1250   product(bool, CheckJNICalls, false,                                       \
1251           "Verify all arguments to JNI calls")                              \
1252                                                                             \
1253   product(bool, CheckEndorsedAndExtDirs, false,                             \
1254           "Verify the endorsed and extension directories are not used")     \
1255                                                                             \
1256   product(bool, UseFastJNIAccessors, true,                                  \
1257           "Use optimized versions of Get<Primitive>Field")                  \
1258                                                                             \
1259   product(intx, MaxJNILocalCapacity, 65536,                                 \
1260           "Maximum allowable local JNI handle capacity to "                 \
1261           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1262           "where <= 0 is unlimited, default: 65536")                        \
1263           range(min_intx, max_intx)                                         \
1264                                                                             \
1265   product(bool, EagerXrunInit, false,                                       \
1266           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1267           "but not all -Xrun libraries may support the state of the VM "    \
1268           "at this time")                                                   \
1269                                                                             \
1270   product(bool, PreserveAllAnnotations, false,                              \
1271           "Preserve RuntimeInvisibleAnnotations as well "                   \
1272           "as RuntimeVisibleAnnotations")                                   \
1273                                                                             \
1274   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1275           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1276                                                                             \
1277   product(bool, UseXMMForArrayCopy, false,                                  \
1278           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1279                                                                             \
1280   product(intx, FieldsAllocationStyle, 1,                                   \
1281           "0 - type based with oops first, "                                \
1282           "1 - with oops last, "                                            \
1283           "2 - oops in super and sub classes are together")                 \
1284           range(0, 2)                                                       \
1285                                                                             \
1286   product(bool, CompactFields, true,                                        \
1287           "Allocate nonstatic fields in gaps between previous fields")      \
1288                                                                             \
1289   notproduct(bool, PrintFieldLayout, false,                                 \
1290           "Print field layout for each class")                              \
1291                                                                             \
1292   /* Need to limit the extent of the padding to reasonable size.          */\
1293   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1294   /* aggressive prefetching, while still leaving the room for segregating */\
1295   /* among the distinct pages.                                            */\
1296   product(intx, ContendedPaddingWidth, 128,                                 \
1297           "How many bytes to pad the fields/classes marked @Contended with")\
1298           range(0, 8192)                                                    \
1299           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1300                                                                             \
1301   product(bool, EnableContended, true,                                      \
1302           "Enable @Contended annotation support")                           \
1303                                                                             \
1304   product(bool, RestrictContended, true,                                    \
1305           "Restrict @Contended to trusted classes")                         \
1306                                                                             \
1307   product(bool, UseBiasedLocking, true,                                     \
1308           "Enable biased locking in JVM")                                   \
1309                                                                             \
1310   product(intx, BiasedLockingStartupDelay, 0,                               \
1311           "Number of milliseconds to wait before enabling biased locking")  \
1312           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1313           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1314                                                                             \
1315   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1316           "Print statistics of biased locking in JVM")                      \
1317                                                                             \
1318   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1319           "Threshold of number of revocations per type to try to "          \
1320           "rebias all objects in the heap of that type")                    \
1321           range(0, max_intx)                                                \
1322           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1323                                                                             \
1324   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1325           "Threshold of number of revocations per type to permanently "     \
1326           "revoke biases of all objects in the heap of that type")          \
1327           range(0, max_intx)                                                \
1328           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1329                                                                             \
1330   product(intx, BiasedLockingDecayTime, 25000,                              \
1331           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1332           "type after previous bulk rebias")                                \
1333           range(500, max_intx)                                              \
1334           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1335                                                                             \
1336   product(bool, ExitOnOutOfMemoryError, false,                              \
1337           "JVM exits on the first occurrence of an out-of-memory error")    \
1338                                                                             \
1339   product(bool, CrashOnOutOfMemoryError, false,                             \
1340           "JVM aborts, producing an error log and core/mini dump, on the "  \
1341           "first occurrence of an out-of-memory error")                     \
1342                                                                             \
1343   /* tracing */                                                             \
1344                                                                             \
1345   develop(bool, StressRewriter, false,                                      \
1346           "Stress linktime bytecode rewriting")                             \
1347                                                                             \
1348   product(ccstr, TraceJVMTI, NULL,                                          \
1349           "Trace flags for JVMTI functions and events")                     \
1350                                                                             \
1351   /* This option can change an EMCP method into an obsolete method. */      \
1352   /* This can affect tests that except specific methods to be EMCP. */      \
1353   /* This option should be used with caution.                       */      \
1354   product(bool, StressLdcRewrite, false,                                    \
1355           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1356                                                                             \
1357   /* change to false by default sometime after Mustang */                   \
1358   product(bool, VerifyMergedCPBytecodes, true,                              \
1359           "Verify bytecodes after RedefineClasses constant pool merging")   \
1360                                                                             \
1361   develop(bool, TraceBytecodes, false,                                      \
1362           "Trace bytecode execution")                                       \
1363                                                                             \
1364   develop(bool, TraceICs, false,                                            \
1365           "Trace inline cache changes")                                     \
1366                                                                             \
1367   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1368           "Trace method invocation counter overflow")                       \
1369                                                                             \
1370   develop(bool, TraceInlineCacheClearing, false,                            \
1371           "Trace clearing of inline caches in nmethods")                    \
1372                                                                             \
1373   develop(bool, TraceDependencies, false,                                   \
1374           "Trace dependencies")                                             \
1375                                                                             \
1376   develop(bool, VerifyDependencies, trueInDebug,                            \
1377           "Exercise and verify the compilation dependency mechanism")       \
1378                                                                             \
1379   develop(bool, TraceNewOopMapGeneration, false,                            \
1380           "Trace OopMapGeneration")                                         \
1381                                                                             \
1382   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1383           "Trace OopMapGeneration: print detailed cell states")             \
1384                                                                             \
1385   develop(bool, TimeOopMap, false,                                          \
1386           "Time calls to GenerateOopMap::compute_map() in sum")             \
1387                                                                             \
1388   develop(bool, TimeOopMap2, false,                                         \
1389           "Time calls to GenerateOopMap::compute_map() individually")       \
1390                                                                             \
1391   develop(bool, TraceOopMapRewrites, false,                                 \
1392           "Trace rewriting of method oops during oop map generation")       \
1393                                                                             \
1394   develop(bool, TraceICBuffer, false,                                       \
1395           "Trace usage of IC buffer")                                       \
1396                                                                             \
1397   develop(bool, TraceCompiledIC, false,                                     \
1398           "Trace changes of compiled IC")                                   \
1399                                                                             \
1400   /* gc */                                                                  \
1401                                                                             \
1402   product(bool, UseSerialGC, false,                                         \
1403           "Use the Serial garbage collector")                               \
1404                                                                             \
1405   product(bool, UseG1GC, false,                                             \
1406           "Use the Garbage-First garbage collector")                        \
1407                                                                             \
1408   product(bool, UseParallelGC, false,                                       \
1409           "Use the Parallel Scavenge garbage collector")                    \
1410                                                                             \
1411   product(bool, UseParallelOldGC, false,                                    \
1412           "Use the Parallel Old garbage collector")                         \
1413                                                                             \
1414   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1415           "How often should we maximally compact the heap (not allowing "   \
1416           "any dead space)")                                                \
1417           range(0, max_uintx)                                               \
1418                                                                             \
1419   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1420           "The collection count for the first maximum compaction")          \
1421           range(0, max_uintx)                                               \
1422                                                                             \
1423   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1424           "Use maximum compaction in the Parallel Old garbage collector "   \
1425           "for a system GC")                                                \
1426                                                                             \
1427   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1428           "The mean used by the parallel compact dead wood "                \
1429           "limiter (a number between 0-100)")                               \
1430           range(0, 100)                                                     \
1431                                                                             \
1432   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1433           "The standard deviation used by the parallel compact dead wood "  \
1434           "limiter (a number between 0-100)")                               \
1435           range(0, 100)                                                     \
1436                                                                             \
1437   product(uint, ParallelGCThreads, 0,                                       \
1438           "Number of parallel threads parallel gc will use")                \
1439           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1440                                                                             \
1441   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1442             "Use semaphore synchronization for the GC Threads, "            \
1443             "instead of synchronization based on mutexes")                  \
1444                                                                             \
1445   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1446           "Dynamically choose the number of parallel threads "              \
1447           "parallel gc will use")                                           \
1448                                                                             \
1449   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1450              "Inject thread creation failures for "                         \
1451              "UseDynamicNumberOfGCThreads")                                 \
1452                                                                             \
1453   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1454           "Force dynamic selection of the number of "                       \
1455           "parallel threads parallel gc will use to aid debugging")         \
1456                                                                             \
1457   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1458           "Size of heap (bytes) per GC thread used in calculating the "     \
1459           "number of GC threads")                                           \
1460           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1461                                                                             \
1462   product(uint, ConcGCThreads, 0,                                           \
1463           "Number of threads concurrent gc will use")                       \
1464           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1465                                                                             \
1466   product(uint, GCTaskTimeStampEntries, 200,                                \
1467           "Number of time stamp entries per gc worker thread")              \
1468           range(1, max_jint)                                                \
1469                                                                             \
1470   product(bool, AlwaysTenure, false,                                        \
1471           "Always tenure objects in eden (ParallelGC only)")                \
1472                                                                             \
1473   product(bool, NeverTenure, false,                                         \
1474           "Never tenure objects in eden, may tenure on overflow "           \
1475           "(ParallelGC only)")                                              \
1476                                                                             \
1477   product(bool, ScavengeBeforeFullGC, true,                                 \
1478           "Scavenge youngest generation before each full GC.")              \
1479                                                                             \
1480   product(bool, UseConcMarkSweepGC, false,                                  \
1481           "Use Concurrent Mark-Sweep GC in the old generation")             \
1482                                                                             \
1483   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1484           "A System.gc() request invokes a concurrent collection; "         \
1485           "(effective only when using concurrent collectors)")              \
1486                                                                             \
1487   product(bool, GCLockerInvokesConcurrent, false,                           \
1488           "The exit of a JNI critical section necessitating a scavenge, "   \
1489           "also kicks off a background concurrent collection")              \
1490                                                                             \
1491   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1492           "How much the GC can expand the eden by while the GC locker "     \
1493           "is active (as a percentage)")                                    \
1494           range(0, 100)                                                     \
1495                                                                             \
1496   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1497           "Number of times to retry allocations when "                      \
1498           "blocked by the GC locker")                                       \
1499           range(0, max_uintx)                                               \
1500                                                                             \
1501   product(bool, UseCMSBestFit, true,                                        \
1502           "Use CMS best fit allocation strategy")                           \
1503                                                                             \
1504   product(uintx, ParallelGCBufferWastePct, 10,                              \
1505           "Wasted fraction of parallel allocation buffer")                  \
1506           range(0, 100)                                                     \
1507                                                                             \
1508   product(uintx, TargetPLABWastePct, 10,                                    \
1509           "Target wasted space in last buffer as percent of overall "       \
1510           "allocation")                                                     \
1511           range(1, 100)                                                     \
1512                                                                             \
1513   product(uintx, PLABWeight, 75,                                            \
1514           "Percentage (0-100) used to weight the current sample when "      \
1515           "computing exponentially decaying average for ResizePLAB")        \
1516           range(0, 100)                                                     \
1517                                                                             \
1518   product(bool, ResizePLAB, true,                                           \
1519           "Dynamically resize (survivor space) promotion LAB's")            \
1520                                                                             \
1521   product(int, ParGCArrayScanChunk, 50,                                     \
1522           "Scan a subset of object array and push remainder, if array is "  \
1523           "bigger than this")                                               \
1524           range(1, max_jint/3)                                              \
1525                                                                             \
1526   product(bool, ParGCUseLocalOverflow, false,                               \
1527           "Instead of a global overflow list, use local overflow stacks")   \
1528                                                                             \
1529   product(bool, ParGCTrimOverflow, true,                                    \
1530           "Eagerly trim the local overflow lists "                          \
1531           "(when ParGCUseLocalOverflow)")                                   \
1532                                                                             \
1533   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1534           "Simulate work queue overflow in ParNew")                         \
1535                                                                             \
1536   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1537           "An `interval' counter that determines how frequently "           \
1538           "we simulate overflow; a smaller number increases frequency")     \
1539                                                                             \
1540   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1541           "The desired number of objects to claim from the overflow list")  \
1542           range(0, max_uintx)                                               \
1543                                                                             \
1544   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1545           "The number of strides per worker thread that we divide up the "  \
1546           "card table scanning work into")                                  \
1547           range(1, max_uintx)                                               \
1548           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1549                                                                             \
1550   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1551           "The number of cards in each chunk of the parallel chunks used "  \
1552           "during card table scanning")                                     \
1553           range(1, max_intx)                                                \
1554           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1555                                                                             \
1556   product(uintx, OldPLABWeight, 50,                                         \
1557           "Percentage (0-100) used to weight the current sample when "      \
1558           "computing exponentially decaying average for resizing "          \
1559           "OldPLABSize")                                                    \
1560           range(0, 100)                                                     \
1561                                                                             \
1562   product(bool, ResizeOldPLAB, true,                                        \
1563           "Dynamically resize (old gen) promotion LAB's")                   \
1564                                                                             \
1565   product(size_t, CMSOldPLABMax, 1024,                                      \
1566           "Maximum size of CMS gen promotion LAB caches per worker "        \
1567           "per block size")                                                 \
1568           range(1, max_uintx)                                               \
1569           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1570                                                                             \
1571   product(size_t, CMSOldPLABMin, 16,                                        \
1572           "Minimum size of CMS gen promotion LAB caches per worker "        \
1573           "per block size")                                                 \
1574           range(1, max_uintx)                                               \
1575           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1576                                                                             \
1577   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1578           "Nominal number of refills of CMS gen promotion LAB cache "       \
1579           "per worker per block size")                                      \
1580           range(1, max_uintx)                                               \
1581                                                                             \
1582   product(bool, CMSOldPLABResizeQuicker, false,                             \
1583           "React on-the-fly during a scavenge to a sudden "                 \
1584           "change in block demand rate")                                    \
1585                                                                             \
1586   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1587           "The tolerance of the phase-change detector for on-the-fly "      \
1588           "PLAB resizing during a scavenge")                                \
1589           range(1, max_uintx)                                               \
1590                                                                             \
1591   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1592           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1593           "during a scavenge")                                              \
1594           range(1, max_uintx)                                               \
1595                                                                             \
1596   product(bool, AlwaysPreTouch, false,                                      \
1597           "Force all freshly committed pages to be pre-touched")            \
1598                                                                             \
1599   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1600           "Per-thread chunk size for parallel memory pre-touch.")           \
1601           range(1, SIZE_MAX / 2)                                            \
1602                                                                             \
1603   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1604           "The maximum size of young gen chosen by default per GC worker "  \
1605           "thread available")                                               \
1606           range(1, max_uintx)                                               \
1607                                                                             \
1608   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1609           "Percentage (0-100) used to add conservatism when computing the " \
1610           "duty cycle")                                                     \
1611           range(0, 100)                                                     \
1612                                                                             \
1613   product(uintx, CMSExpAvgFactor, 50,                                       \
1614           "Percentage (0-100) used to weight the current sample when "      \
1615           "computing exponential averages for CMS statistics")              \
1616           range(0, 100)                                                     \
1617                                                                             \
1618   product(uintx, CMS_FLSWeight, 75,                                         \
1619           "Percentage (0-100) used to weight the current sample when "      \
1620           "computing exponentially decaying averages for CMS FLS "          \
1621           "statistics")                                                     \
1622           range(0, 100)                                                     \
1623                                                                             \
1624   product(uintx, CMS_FLSPadding, 1,                                         \
1625           "The multiple of deviation from mean to use for buffering "       \
1626           "against volatility in free list demand")                         \
1627           range(0, max_juint)                                               \
1628                                                                             \
1629   product(uintx, FLSCoalescePolicy, 2,                                      \
1630           "CMS: aggressiveness level for coalescing, increasing "           \
1631           "from 0 to 4")                                                    \
1632           range(0, 4)                                                       \
1633                                                                             \
1634   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1635           "CMS: larger free blocks are always available for coalescing")    \
1636                                                                             \
1637   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1638           "CMS: the smaller the percentage the greater the coalescing "     \
1639           "force")                                                          \
1640           range(0.0, 1.0)                                                   \
1641                                                                             \
1642   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1643           "CMS: the factor by which to inflate estimated demand of small "  \
1644           "block sizes to prevent coalescing with an adjoining block")      \
1645           range(0.0, DBL_MAX)                                               \
1646                                                                             \
1647   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1648           "CMS: the factor by which to inflate estimated demand of large "  \
1649           "block sizes to prevent coalescing with an adjoining block")      \
1650           range(0.0, DBL_MAX)                                               \
1651                                                                             \
1652   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1653           "CMS: the factor by which to inflate estimated demand of small "  \
1654           "block sizes to prevent splitting to supply demand for smaller "  \
1655           "blocks")                                                         \
1656           range(0.0, DBL_MAX)                                               \
1657                                                                             \
1658   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1659           "CMS: the factor by which to inflate estimated demand of large "  \
1660           "block sizes to prevent splitting to supply demand for smaller "  \
1661           "blocks")                                                         \
1662           range(0.0, DBL_MAX)                                               \
1663                                                                             \
1664   product(bool, CMSExtrapolateSweep, false,                                 \
1665           "CMS: cushion for block demand during sweep")                     \
1666                                                                             \
1667   product(uintx, CMS_SweepWeight, 75,                                       \
1668           "Percentage (0-100) used to weight the current sample when "      \
1669           "computing exponentially decaying average for inter-sweep "       \
1670           "duration")                                                       \
1671           range(0, 100)                                                     \
1672                                                                             \
1673   product(uintx, CMS_SweepPadding, 1,                                       \
1674           "The multiple of deviation from mean to use for buffering "       \
1675           "against volatility in inter-sweep duration")                     \
1676           range(0, max_juint)                                               \
1677                                                                             \
1678   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1679           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1680           "duration exceeds this threshold in milliseconds")                \
1681           range(0, max_uintx)                                               \
1682                                                                             \
1683   product(bool, CMSClassUnloadingEnabled, true,                             \
1684           "Whether class unloading enabled when using CMS GC")              \
1685                                                                             \
1686   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1687           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1688           "count for which classes may not be unloaded")                    \
1689           range(0, max_uintx)                                               \
1690                                                                             \
1691   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1692           "Replenish an indexed free list with this number of chunks")      \
1693           range(1, max_uintx)                                               \
1694                                                                             \
1695   product(bool, CMSReplenishIntermediate, true,                             \
1696           "Replenish all intermediate free-list caches")                    \
1697                                                                             \
1698   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1699           "When satisfying batched demand, split blocks from the "          \
1700           "IndexedFreeList whose size is a multiple of requested size")     \
1701                                                                             \
1702   product(bool, CMSLoopWarn, false,                                         \
1703           "Warn in case of excessive CMS looping")                          \
1704                                                                             \
1705   /* where does the range max value of (max_jint - 1) come from? */         \
1706   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1707           "Maximum size of marking stack")                                  \
1708           range(1, (max_jint - 1))                                          \
1709                                                                             \
1710   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1711           "Size of marking stack")                                          \
1712           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1713                                                                             \
1714   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1715           "Simulate frequent marking stack / work queue overflow")          \
1716                                                                             \
1717   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1718           "An \"interval\" counter that determines how frequently "         \
1719           "to simulate overflow; a smaller number increases frequency")     \
1720                                                                             \
1721   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1722           "Maximum number of abortable preclean iterations, if > 0")        \
1723           range(0, max_uintx)                                               \
1724                                                                             \
1725   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1726           "Maximum time in abortable preclean (in milliseconds)")           \
1727           range(0, max_intx)                                                \
1728                                                                             \
1729   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1730           "Nominal minimum work per abortable preclean iteration")          \
1731           range(0, max_uintx)                                               \
1732                                                                             \
1733   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1734           "Time that we sleep between iterations when not given "           \
1735           "enough work per iteration")                                      \
1736           range(0, max_intx)                                                \
1737                                                                             \
1738   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1739   product(size_t, CMSRescanMultiple, 32,                                    \
1740           "Size (in cards) of CMS parallel rescan task")                    \
1741           range(1, SIZE_MAX / 4096)                                         \
1742           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1743                                                                             \
1744   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1745   product(size_t, CMSConcMarkMultiple, 32,                                  \
1746           "Size (in cards) of CMS concurrent MT marking task")              \
1747           range(1, SIZE_MAX / 4096)                                         \
1748           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1749                                                                             \
1750   product(bool, CMSAbortSemantics, false,                                   \
1751           "Whether abort-on-overflow semantics is implemented")             \
1752                                                                             \
1753   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1754           "Use the parallel initial mark.")                                 \
1755                                                                             \
1756   product(bool, CMSParallelRemarkEnabled, true,                             \
1757           "Whether parallel remark enabled (only if ParNewGC)")             \
1758                                                                             \
1759   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1760           "Whether parallel remark of survivor space "                      \
1761           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1762                                                                             \
1763   product(bool, CMSPLABRecordAlways, true,                                  \
1764           "Always record survivor space PLAB boundaries (effective only "   \
1765           "if CMSParallelSurvivorRemarkEnabled)")                           \
1766                                                                             \
1767   product(bool, CMSEdenChunksRecordAlways, true,                            \
1768           "Always record eden chunks used for the parallel initial mark "   \
1769           "or remark of eden")                                              \
1770                                                                             \
1771   product(bool, CMSConcurrentMTEnabled, true,                               \
1772           "Whether multi-threaded concurrent work enabled "                 \
1773           "(effective only if ParNewGC)")                                   \
1774                                                                             \
1775   product(bool, CMSPrecleaningEnabled, true,                                \
1776           "Whether concurrent precleaning enabled")                         \
1777                                                                             \
1778   product(uintx, CMSPrecleanIter, 3,                                        \
1779           "Maximum number of precleaning iteration passes")                 \
1780           range(0, 9)                                                       \
1781                                                                             \
1782   product(uintx, CMSPrecleanDenominator, 3,                                 \
1783           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1784           "ratio")                                                          \
1785           range(1, max_uintx)                                               \
1786           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1787                                                                             \
1788   product(uintx, CMSPrecleanNumerator, 2,                                   \
1789           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1790           "ratio")                                                          \
1791           range(0, max_uintx-1)                                             \
1792           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1793                                                                             \
1794   product(bool, CMSPrecleanRefLists1, true,                                 \
1795           "Preclean ref lists during (initial) preclean phase")             \
1796                                                                             \
1797   product(bool, CMSPrecleanRefLists2, false,                                \
1798           "Preclean ref lists during abortable preclean phase")             \
1799                                                                             \
1800   product(bool, CMSPrecleanSurvivors1, false,                               \
1801           "Preclean survivors during (initial) preclean phase")             \
1802                                                                             \
1803   product(bool, CMSPrecleanSurvivors2, true,                                \
1804           "Preclean survivors during abortable preclean phase")             \
1805                                                                             \
1806   product(uintx, CMSPrecleanThreshold, 1000,                                \
1807           "Do not iterate again if number of dirty cards is less than this")\
1808           range(100, max_uintx)                                             \
1809                                                                             \
1810   product(bool, CMSCleanOnEnter, true,                                      \
1811           "Clean-on-enter optimization for reducing number of dirty cards") \
1812                                                                             \
1813   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1814           "Choose variant (1,2) of verification following remark")          \
1815           range(1, 2)                                                       \
1816                                                                             \
1817   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1818           "If Eden size is below this, do not try to schedule remark")      \
1819           range(0, max_uintx)                                               \
1820                                                                             \
1821   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1822           "The Eden occupancy percentage (0-100) at which "                 \
1823           "to try and schedule remark pause")                               \
1824           range(0, 100)                                                     \
1825                                                                             \
1826   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1827           "Start sampling eden top at least before young gen "              \
1828           "occupancy reaches 1/<ratio> of the size at which "               \
1829           "we plan to schedule remark")                                     \
1830           range(1, max_uintx)                                               \
1831                                                                             \
1832   product(uintx, CMSSamplingGrain, 16*K,                                    \
1833           "The minimum distance between eden samples for CMS (see above)")  \
1834           range(ObjectAlignmentInBytes, max_uintx)                          \
1835           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1836                                                                             \
1837   product(bool, CMSScavengeBeforeRemark, false,                             \
1838           "Attempt scavenge before the CMS remark step")                    \
1839                                                                             \
1840   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1841           "Don't drain below this size per parallel worker/thief")          \
1842           range(1, max_juint)                                               \
1843           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1844                                                                             \
1845   manageable(intx, CMSWaitDuration, 2000,                                   \
1846           "Time in milliseconds that CMS thread waits for young GC")        \
1847           range(min_jint, max_jint)                                         \
1848                                                                             \
1849   develop(uintx, CMSCheckInterval, 1000,                                    \
1850           "Interval in milliseconds that CMS thread checks if it "          \
1851           "should start a collection cycle")                                \
1852                                                                             \
1853   product(bool, CMSYield, true,                                             \
1854           "Yield between steps of CMS")                                     \
1855                                                                             \
1856   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1857           "Bitmap operations should process at most this many bits "        \
1858           "between yields")                                                 \
1859           range(1, max_uintx)                                               \
1860           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1861                                                                             \
1862   product(bool, CMSPrintChunksInDump, false,                                \
1863           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1864           "trace level include more detailed information about the"         \
1865           "free chunks")                \
1866                                                                             \
1867   product(bool, CMSPrintObjectsInDump, false,                               \
1868           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1869           "trace level include more detailed information about the"         \
1870           "allocated objects")                                              \
1871                                                                             \
1872   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1873           "Verify that all references across the FLS boundary "             \
1874           "are to valid objects")                                           \
1875                                                                             \
1876   diagnostic(bool, FLSVerifyLists, false,                                   \
1877           "Do lots of (expensive) FreeListSpace verification")              \
1878                                                                             \
1879   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1880           "Do lots of (expensive) FLS index table verification")            \
1881                                                                             \
1882   develop(bool, FLSVerifyDictionary, false,                                 \
1883           "Do lots of (expensive) FLS dictionary verification")             \
1884                                                                             \
1885   develop(bool, VerifyBlockOffsetArray, false,                              \
1886           "Do (expensive) block offset array verification")                 \
1887                                                                             \
1888   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1889           "Maintain _unallocated_block in BlockOffsetArray "                \
1890           "(currently applicable only to CMS collector)")                   \
1891                                                                             \
1892   product(intx, RefDiscoveryPolicy, 0,                                      \
1893           "Select type of reference discovery policy: "                     \
1894           "reference-based(0) or referent-based(1)")                        \
1895           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1896                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1897                                                                             \
1898   product(bool, ParallelRefProcEnabled, false,                              \
1899           "Enable parallel reference processing whenever possible")         \
1900                                                                             \
1901   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1902           "Enable balancing of reference processing queues")                \
1903                                                                             \
1904   product(uintx, CMSTriggerRatio, 80,                                       \
1905           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1906           "allocated before a CMS collection cycle commences")              \
1907           range(0, 100)                                                     \
1908                                                                             \
1909   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1910           "Percentage CMS generation occupancy at which to "                \
1911           "initiate CMS collection for bootstrapping collection stats")     \
1912           range(0, 100)                                                     \
1913                                                                             \
1914   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1915           "Percentage CMS generation occupancy to start a CMS collection "  \
1916           "cycle. A negative value means that CMSTriggerRatio is used")     \
1917           range(min_intx, 100)                                              \
1918                                                                             \
1919   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1920           "The percent occupancy (IHOP) of the current old generation "     \
1921           "capacity above which a concurrent mark cycle will be initiated " \
1922           "Its value may change over time if adaptive IHOP is enabled, "    \
1923           "otherwise the value remains constant. "                          \
1924           "In the latter case a value of 0 will result as frequent as "     \
1925           "possible concurrent marking cycles. A value of 100 disables "    \
1926           "concurrent marking. "                                            \
1927           "Fragmentation waste in the old generation is not considered "    \
1928           "free space in this calculation. (G1 collector only)")            \
1929           range(0, 100)                                                     \
1930                                                                             \
1931   manageable(intx, CMSTriggerInterval, -1,                                  \
1932           "Commence a CMS collection cycle (at least) every so many "       \
1933           "milliseconds (0 permanently, -1 disabled)")                      \
1934           range(-1, max_intx)                                               \
1935                                                                             \
1936   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1937           "Only use occupancy as a criterion for starting a CMS collection")\
1938                                                                             \
1939   product(uintx, CMSIsTooFullPercentage, 98,                                \
1940           "An absolute ceiling above which CMS will always consider the "   \
1941           "unloading of classes when class unloading is enabled")           \
1942           range(0, 100)                                                     \
1943                                                                             \
1944   develop(bool, CMSTestInFreeList, false,                                   \
1945           "Check if the coalesced range is already in the "                 \
1946           "free lists as claimed")                                          \
1947                                                                             \
1948   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1949           "Check that all the garbage collected was returned to the "       \
1950           "free lists")                                                     \
1951                                                                             \
1952   notproduct(bool, ScavengeALot, false,                                     \
1953           "Force scavenge at every Nth exit from the runtime system "       \
1954           "(N=ScavengeALotInterval)")                                       \
1955                                                                             \
1956   develop(bool, FullGCALot, false,                                          \
1957           "Force full gc at every Nth exit from the runtime system "        \
1958           "(N=FullGCALotInterval)")                                         \
1959                                                                             \
1960   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1961           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1962                                                                             \
1963   notproduct(bool, PromotionFailureALot, false,                             \
1964           "Use promotion failure handling on every youngest generation "    \
1965           "collection")                                                     \
1966                                                                             \
1967   develop(uintx, PromotionFailureALotCount, 1000,                           \
1968           "Number of promotion failures occurring at PLAB "                 \
1969           "refill attempts (ParNew) or promotion attempts "                 \
1970           "(other young collectors)")                                       \
1971                                                                             \
1972   develop(uintx, PromotionFailureALotInterval, 5,                           \
1973           "Total collections between promotion failures a lot")             \
1974                                                                             \
1975   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1976           "Sleep time when sleep is used for yields")                       \
1977                                                                             \
1978   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1979           "Number of yields before a sleep is done during work stealing")   \
1980                                                                             \
1981   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1982           "Number of iterations in a spin loop between checks on "          \
1983           "time out of hard spin")                                          \
1984                                                                             \
1985   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1986           "Ratio of hard spins to calls to yield")                          \
1987                                                                             \
1988   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1989           "Number of object array elements to push onto the marking stack " \
1990           "before pushing a continuation entry")                            \
1991                                                                             \
1992   develop(bool, MetadataAllocationFailALot, false,                          \
1993           "Fail metadata allocations at intervals controlled by "           \
1994           "MetadataAllocationFailALotInterval")                             \
1995                                                                             \
1996   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1997           "Metadata allocation failure a lot interval")                     \
1998                                                                             \
1999   notproduct(bool, ExecuteInternalVMTests, false,                           \
2000           "Enable execution of internal VM tests")                          \
2001                                                                             \
2002   notproduct(bool, VerboseInternalVMTests, false,                           \
2003           "Turn on logging for internal VM tests.")                         \
2004                                                                             \
2005   product(bool, ExecutingUnitTests, false,                                  \
2006           "Whether the JVM is running unit tests or not")                   \
2007                                                                             \
2008   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2009                                                                             \
2010   product_pd(bool, ResizeTLAB,                                              \
2011           "Dynamically resize TLAB size for threads")                       \
2012                                                                             \
2013   product(bool, ZeroTLAB, false,                                            \
2014           "Zero out the newly created TLAB")                                \
2015                                                                             \
2016   product(bool, FastTLABRefill, true,                                       \
2017           "Use fast TLAB refill code")                                      \
2018                                                                             \
2019   product(bool, TLABStats, true,                                            \
2020           "Provide more detailed and expensive TLAB statistics.")           \
2021                                                                             \
2022   product_pd(bool, NeverActAsServerClassMachine,                            \
2023           "Never act like a server-class machine")                          \
2024                                                                             \
2025   product(bool, AlwaysActAsServerClassMachine, false,                       \
2026           "Always act like a server-class machine")                         \
2027                                                                             \
2028   product_pd(uint64_t, MaxRAM,                                              \
2029           "Real memory size (in bytes) used to set maximum heap size")      \
2030           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2031                                                                             \
2032   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2033           "Maximum ergonomically set heap size (in bytes); zero means use " \
2034           "MaxRAM * MaxRAMPercentage / 100")                                \
2035           range(0, max_uintx)                                               \
2036                                                                             \
2037   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2038           "Use CGroup memory limit as physical memory limit for heap "      \
2039           "sizing")                                                         \
2040                                                                             \
2041   product(uintx, MaxRAMFraction, 4,                                         \
2042           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2043           "size. "                                                          \
2044           "Deprecated, use MaxRAMPercentage instead")                       \
2045           range(1, max_uintx)                                               \
2046                                                                             \
2047   product(uintx, MinRAMFraction, 2,                                         \
2048           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2049           "size on systems with small physical memory size. "               \
2050           "Deprecated, use MinRAMPercentage instead")                       \
2051           range(1, max_uintx)                                               \
2052                                                                             \
2053   product(uintx, InitialRAMFraction, 64,                                    \
2054           "Fraction (1/n) of real memory used for initial heap size. "      \
2055           "Deprecated, use InitialRAMPercentage instead")                   \
2056           range(1, max_uintx)                                               \
2057                                                                             \
2058   product(double, MaxRAMPercentage, 25.0,                                   \
2059           "Maximum percentage of real memory used for maximum heap size")   \
2060           range(0.0, 100.0)                                                 \
2061                                                                             \
2062   product(double, MinRAMPercentage, 50.0,                                   \
2063           "Minimum percentage of real memory used for maximum heap"         \
2064           "size on systems with small physical memory size")                \
2065           range(0.0, 100.0)                                                 \
2066                                                                             \
2067   product(double, InitialRAMPercentage, 1.5625,                             \
2068           "Percentage of real memory used for initial heap size")           \
2069           range(0.0, 100.0)                                                 \
2070                                                                             \
2071   develop(uintx, MaxVirtMemFraction, 2,                                     \
2072           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2073           "determining maximum heap size")                                  \
2074                                                                             \
2075   product(bool, UseAdaptiveSizePolicy, true,                                \
2076           "Use adaptive generation sizing policies")                        \
2077                                                                             \
2078   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2079           "Use adaptive survivor sizing policies")                          \
2080                                                                             \
2081   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2082           "Use adaptive young-old sizing policies at minor collections")    \
2083                                                                             \
2084   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2085           "Use adaptive young-old sizing policies at major collections")    \
2086                                                                             \
2087   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2088           "Include statistics from System.gc() for adaptive size policy")   \
2089                                                                             \
2090   product(bool, UseAdaptiveGCBoundary, false,                               \
2091           "Allow young-old boundary to move")                               \
2092                                                                             \
2093   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2094           "Resize the virtual spaces of the young or old generations")      \
2095           range(-1, 1)                                                      \
2096                                                                             \
2097   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2098           "Policy for changing generation size for throughput goals")       \
2099           range(0, 1)                                                       \
2100                                                                             \
2101   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2102           "Number of steps where heuristics is used before data is used")   \
2103           range(0, max_uintx)                                               \
2104                                                                             \
2105   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2106           "Number of collections before the adaptive sizing is started")    \
2107                                                                             \
2108   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2109           "Collection interval for printing information; zero means never") \
2110           range(0, max_uintx)                                               \
2111                                                                             \
2112   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2113           "Use adaptive minimum footprint as a goal")                       \
2114                                                                             \
2115   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2116           "Weight given to exponential resizing, between 0 and 100")        \
2117           range(0, 100)                                                     \
2118                                                                             \
2119   product(uintx, AdaptiveTimeWeight,       25,                              \
2120           "Weight given to time in adaptive policy, between 0 and 100")     \
2121           range(0, 100)                                                     \
2122                                                                             \
2123   product(uintx, PausePadding, 1,                                           \
2124           "How much buffer to keep for pause time")                         \
2125           range(0, max_juint)                                               \
2126                                                                             \
2127   product(uintx, PromotedPadding, 3,                                        \
2128           "How much buffer to keep for promotion failure")                  \
2129           range(0, max_juint)                                               \
2130                                                                             \
2131   product(uintx, SurvivorPadding, 3,                                        \
2132           "How much buffer to keep for survivor overflow")                  \
2133           range(0, max_juint)                                               \
2134                                                                             \
2135   product(uintx, ThresholdTolerance, 10,                                    \
2136           "Allowed collection cost difference between generations")         \
2137           range(0, 100)                                                     \
2138                                                                             \
2139   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2140           "If collection costs are within margin, reduce both by full "     \
2141           "delta")                                                          \
2142           range(0, 100)                                                     \
2143                                                                             \
2144   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2145           "Adaptive size percentage change in young generation")            \
2146           range(0, 100)                                                     \
2147                                                                             \
2148   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2149           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2150           range(0, 100)                                                     \
2151                                                                             \
2152   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2153           "Decay factor to YoungedGenerationSizeSupplement")                \
2154           range(1, max_uintx)                                               \
2155                                                                             \
2156   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2157           "Adaptive size percentage change in tenured generation")          \
2158           range(0, 100)                                                     \
2159                                                                             \
2160   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2161           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2162           range(0, 100)                                                     \
2163                                                                             \
2164   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2165           "Decay factor to TenuredGenerationSizeIncrement")                 \
2166           range(1, max_uintx)                                               \
2167                                                                             \
2168   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2169           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2170           "or (G1 Only) the maximum GC time per MMU time slice")            \
2171           range(1, max_uintx - 1)                                           \
2172           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2173                                                                             \
2174   product(uintx, GCPauseIntervalMillis, 0,                                  \
2175           "Time slice for MMU specification")                               \
2176           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2177                                                                             \
2178   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2179           "Adaptive size policy maximum GC minor pause time goal "          \
2180           "in millisecond")                                                 \
2181           range(0, max_uintx)                                               \
2182                                                                             \
2183   product(uintx, GCTimeRatio, 99,                                           \
2184           "Adaptive size policy application time to GC time ratio")         \
2185           range(0, max_juint)                                               \
2186                                                                             \
2187   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2188           "Adaptive size scale down factor for shrinking")                  \
2189           range(1, max_uintx)                                               \
2190                                                                             \
2191   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2192           "Adaptive size decays the major cost for long major intervals")   \
2193                                                                             \
2194   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2195           "Time scale over which major costs decay")                        \
2196           range(0, max_uintx)                                               \
2197                                                                             \
2198   product(uintx, MinSurvivorRatio, 3,                                       \
2199           "Minimum ratio of young generation/survivor space size")          \
2200           range(3, max_uintx)                                               \
2201                                                                             \
2202   product(uintx, InitialSurvivorRatio, 8,                                   \
2203           "Initial ratio of young generation/survivor space size")          \
2204           range(0, max_uintx)                                               \
2205                                                                             \
2206   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2207           "Estimate of footprint other than Java Heap")                     \
2208           range(0, max_uintx)                                               \
2209                                                                             \
2210   product(bool, UseGCOverheadLimit, true,                                   \
2211           "Use policy to limit of proportion of time spent in GC "          \
2212           "before an OutOfMemory error is thrown")                          \
2213                                                                             \
2214   product(uintx, GCTimeLimit, 98,                                           \
2215           "Limit of the proportion of time spent in GC before "             \
2216           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2217           range(0, 100)                                                     \
2218                                                                             \
2219   product(uintx, GCHeapFreeLimit, 2,                                        \
2220           "Minimum percentage of free space after a full GC before an "     \
2221           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2222           range(0, 100)                                                     \
2223                                                                             \
2224   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2225           "Number of consecutive collections before gc time limit fires")   \
2226           range(1, max_uintx)                                               \
2227                                                                             \
2228   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2229           "How far ahead to prefetch destination area (<= 0 means off)")    \
2230           range(-1, max_jint)                                               \
2231                                                                             \
2232   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2233           "How far ahead to prefetch scan area (<= 0 means off)")           \
2234           range(-1, max_jint)                                               \
2235                                                                             \
2236   product(intx, PrefetchFieldsAhead, -1,                                    \
2237           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2238           range(-1, max_jint)                                               \
2239                                                                             \
2240   diagnostic(bool, VerifyDuringStartup, false,                              \
2241           "Verify memory system before executing any Java code "            \
2242           "during VM initialization")                                       \
2243                                                                             \
2244   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2245           "Verify system before exiting")                                   \
2246                                                                             \
2247   diagnostic(bool, VerifyBeforeGC, false,                                   \
2248           "Verify memory system before GC")                                 \
2249                                                                             \
2250   diagnostic(bool, VerifyAfterGC, false,                                    \
2251           "Verify memory system after GC")                                  \
2252                                                                             \
2253   diagnostic(bool, VerifyDuringGC, false,                                   \
2254           "Verify memory system during GC (between phases)")                \
2255                                                                             \
2256   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2257           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2258           "are enabled. One or more sub-systems can be specified "          \
2259           "in a comma separated string. Sub-systems are: "                  \
2260           "threads, heap, symbol_table, string_table, codecache, "          \
2261           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2262           "codecache_oops")                                                 \
2263                                                                             \
2264   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2265           "Enable parallel memory system verification")                     \
2266                                                                             \
2267   diagnostic(bool, DeferInitialCardMark, false,                             \
2268           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2269           "may arise from new_pre_store_barrier")                           \
2270                                                                             \
2271   product(bool, UseCondCardMark, false,                                     \
2272           "Check for already marked card before updating card table")       \
2273                                                                             \
2274   diagnostic(bool, VerifyRememberedSets, false,                             \
2275           "Verify GC remembered sets")                                      \
2276                                                                             \
2277   diagnostic(bool, VerifyObjectStartArray, true,                            \
2278           "Verify GC object start array if verify before/after")            \
2279                                                                             \
2280   product(bool, DisableExplicitGC, false,                                   \
2281           "Ignore calls to System.gc()")                                    \
2282                                                                             \
2283   notproduct(bool, CheckMemoryInitialization, false,                        \
2284           "Check memory initialization")                                    \
2285                                                                             \
2286   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2287           "Bind CMS Thread to CPU if possible")                             \
2288                                                                             \
2289   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2290           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2291           range(0, max_juint)                                               \
2292                                                                             \
2293   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2294           "Bind GCTaskThreads to CPUs if possible")                         \
2295                                                                             \
2296   product(bool, UseGCTaskAffinity, false,                                   \
2297           "Use worker affinity when asking for GCTasks")                    \
2298                                                                             \
2299   product(uintx, ProcessDistributionStride, 4,                              \
2300           "Stride through processors when distributing processes")          \
2301           range(0, max_juint)                                               \
2302                                                                             \
2303   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2304           "Number of times the coordinator GC thread will sleep while "     \
2305           "yielding before giving up and resuming GC")                      \
2306           range(0, max_juint)                                               \
2307                                                                             \
2308   product(uintx, CMSYieldSleepCount, 0,                                     \
2309           "Number of times a GC thread (minus the coordinator) "            \
2310           "will sleep while yielding before giving up and resuming GC")     \
2311           range(0, max_juint)                                               \
2312                                                                             \
2313   product(bool, PrintGC, false,                                             \
2314           "Print message at garbage collection. "                           \
2315           "Deprecated, use -Xlog:gc instead.")                              \
2316                                                                             \
2317   product(bool, PrintGCDetails, false,                                      \
2318           "Print more details at garbage collection. "                      \
2319           "Deprecated, use -Xlog:gc* instead.")                             \
2320                                                                             \
2321   develop(intx, ConcGCYieldTimeout, 0,                                      \
2322           "If non-zero, assert that GC threads yield within this "          \
2323           "number of milliseconds")                                         \
2324           range(0, max_intx)                                                \
2325                                                                             \
2326   develop(bool, TraceFinalizerRegistration, false,                          \
2327           "Trace registration of final references")                         \
2328                                                                             \
2329   notproduct(bool, TraceScavenge, false,                                    \
2330           "Trace scavenge")                                                 \
2331                                                                             \
2332   product(bool, IgnoreEmptyClassPaths, false,                               \
2333           "Ignore empty path elements in -classpath")                       \
2334                                                                             \
2335   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2336           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2337           "Initial size of the boot class loader data metaspace")           \
2338           range(30*K, max_uintx/BytesPerWord)                               \
2339           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2340                                                                             \
2341   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2342           "Print heap layout in response to SIGBREAK")                      \
2343                                                                             \
2344   manageable(bool, PrintClassHistogram, false,                              \
2345           "Print a histogram of class instances")                           \
2346                                                                             \
2347   develop(bool, TraceGCTaskManager, false,                                  \
2348           "Trace actions of the GC task manager")                           \
2349                                                                             \
2350   develop(bool, TraceGCTaskQueue, false,                                    \
2351           "Trace actions of the GC task queues")                            \
2352                                                                             \
2353   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2354           "Trace marking phase in ParallelOldGC")                           \
2355                                                                             \
2356   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2357           "Trace dense prefix computation for ParallelOldGC")               \
2358                                                                             \
2359   develop(bool, IgnoreLibthreadGPFault, false,                              \
2360           "Suppress workaround for libthread GP fault")                     \
2361                                                                             \
2362   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2363           "The percentage of the used heap that the instances of a class "  \
2364           "must occupy for the class to generate a trace event")            \
2365           range(0.0, 100.0)                                                 \
2366                                                                             \
2367   /* JVMTI heap profiling */                                                \
2368                                                                             \
2369   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2370           "Trace JVMTI object tagging calls")                               \
2371                                                                             \
2372   diagnostic(bool, VerifyBeforeIteration, false,                            \
2373           "Verify memory system before JVMTI iteration")                    \
2374                                                                             \
2375   /* compiler interface */                                                  \
2376                                                                             \
2377   develop(bool, CIPrintCompilerName, false,                                 \
2378           "when CIPrint is active, print the name of the active compiler")  \
2379                                                                             \
2380   diagnostic(bool, CIPrintCompileQueue, false,                              \
2381           "display the contents of the compile queue whenever a "           \
2382           "compilation is enqueued")                                        \
2383                                                                             \
2384   develop(bool, CIPrintRequests, false,                                     \
2385           "display every request for compilation")                          \
2386                                                                             \
2387   product(bool, CITime, false,                                              \
2388           "collect timing information for compilation")                     \
2389                                                                             \
2390   develop(bool, CITimeVerbose, false,                                       \
2391           "be more verbose in compilation timings")                         \
2392                                                                             \
2393   develop(bool, CITimeEach, false,                                          \
2394           "display timing information after each successful compilation")   \
2395                                                                             \
2396   develop(bool, CICountOSR, false,                                          \
2397           "use a separate counter when assigning ids to osr compilations")  \
2398                                                                             \
2399   develop(bool, CICompileNatives, true,                                     \
2400           "compile native methods if supported by the compiler")            \
2401                                                                             \
2402   develop_pd(bool, CICompileOSR,                                            \
2403           "compile on stack replacement methods if supported by the "       \
2404           "compiler")                                                       \
2405                                                                             \
2406   develop(bool, CIPrintMethodCodes, false,                                  \
2407           "print method bytecodes of the compiled code")                    \
2408                                                                             \
2409   develop(bool, CIPrintTypeFlow, false,                                     \
2410           "print the results of ciTypeFlow analysis")                       \
2411                                                                             \
2412   develop(bool, CITraceTypeFlow, false,                                     \
2413           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2414                                                                             \
2415   develop(intx, OSROnlyBCI, -1,                                             \
2416           "OSR only at this bci.  Negative values mean exclude that bci")   \
2417                                                                             \
2418   /* compiler */                                                            \
2419                                                                             \
2420   /* notice: the max range value here is max_jint, not max_intx  */         \
2421   /* because of overflow issue                                   */         \
2422   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2423           "Number of compiler threads to run")                              \
2424           range(0, max_jint)                                                \
2425           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2426                                                                             \
2427   product(intx, CompilationPolicyChoice, 0,                                 \
2428           "which compilation policy (0-3)")                                 \
2429           range(0, 3)                                                       \
2430                                                                             \
2431   develop(bool, UseStackBanging, true,                                      \
2432           "use stack banging for stack overflow checks (required for "      \
2433           "proper StackOverflow handling; disable only to measure cost "    \
2434           "of stackbanging)")                                               \
2435                                                                             \
2436   develop(bool, UseStrictFP, true,                                          \
2437           "use strict fp if modifier strictfp is set")                      \
2438                                                                             \
2439   develop(bool, GenerateSynchronizationCode, true,                          \
2440           "generate locking/unlocking code for synchronized methods and "   \
2441           "monitors")                                                       \
2442                                                                             \
2443   develop(bool, GenerateRangeChecks, true,                                  \
2444           "Generate range checks for array accesses")                       \
2445                                                                             \
2446   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2447           "Generate code for implicit null checks")                         \
2448                                                                             \
2449   product_pd(bool, TrapBasedNullChecks,                                     \
2450           "Generate code for null checks that uses a cmp and trap "         \
2451           "instruction raising SIGTRAP.  This is only used if an access to" \
2452           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2453           "ImplicitNullChecks don't work (PPC64).")                         \
2454                                                                             \
2455   product(bool, PrintSafepointStatistics, false,                            \
2456           "Print statistics about safepoint synchronization")               \
2457                                                                             \
2458   product(intx, PrintSafepointStatisticsCount, 300,                         \
2459           "Total number of safepoint statistics collected "                 \
2460           "before printing them out")                                       \
2461           range(1, max_intx)                                                \
2462                                                                             \
2463   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2464           "Print safepoint statistics only when safepoint takes "           \
2465           "more than PrintSafepointSatisticsTimeout in millis")             \
2466   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2467   NOT_LP64(range(-1, max_intx))                                             \
2468                                                                             \
2469   product(bool, Inline, true,                                               \
2470           "Enable inlining")                                                \
2471                                                                             \
2472   product(bool, ClipInlining, true,                                         \
2473           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2474                                                                             \
2475   develop(bool, UseCHA, true,                                               \
2476           "Enable CHA")                                                     \
2477                                                                             \
2478   product(bool, UseTypeProfile, true,                                       \
2479           "Check interpreter profile for historically monomorphic calls")   \
2480                                                                             \
2481   diagnostic(bool, PrintInlining, false,                                    \
2482           "Print inlining optimizations")                                   \
2483                                                                             \
2484   product(bool, UsePopCountInstruction, false,                              \
2485           "Use population count instruction")                               \
2486                                                                             \
2487   develop(bool, EagerInitialization, false,                                 \
2488           "Eagerly initialize classes if possible")                         \
2489                                                                             \
2490   diagnostic(bool, LogTouchedMethods, false,                                \
2491           "Log methods which have been ever touched in runtime")            \
2492                                                                             \
2493   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2494           "Print all methods that have been ever touched in runtime")       \
2495                                                                             \
2496   develop(bool, TraceMethodReplacement, false,                              \
2497           "Print when methods are replaced do to recompilation")            \
2498                                                                             \
2499   develop(bool, PrintMethodFlushing, false,                                 \
2500           "Print the nmethods being flushed")                               \
2501                                                                             \
2502   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2503           "print statistics about method flushing")                         \
2504                                                                             \
2505   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2506           "Number of compiled code invocations after which "                \
2507           "the method is considered as hot by the flusher")                 \
2508           range(1, max_jint)                                                \
2509                                                                             \
2510   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2511           "Minimum number of sweeper passes before an nmethod "             \
2512           "can be flushed")                                                 \
2513           range(0, max_intx)                                                \
2514                                                                             \
2515   product(bool, UseCodeAging, true,                                         \
2516           "Insert counter to detect warm methods")                          \
2517                                                                             \
2518   diagnostic(bool, StressCodeAging, false,                                  \
2519           "Start with counters compiled in")                                \
2520                                                                             \
2521   develop(bool, StressCodeBuffers, false,                                   \
2522           "Exercise code buffer expansion and other rare state changes")    \
2523                                                                             \
2524   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2525           "Generate extra debugging information for non-safepoints in "     \
2526           "nmethods")                                                       \
2527                                                                             \
2528   product(bool, PrintVMOptions, false,                                      \
2529           "Print flags that appeared on the command line")                  \
2530                                                                             \
2531   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2532           "Ignore unrecognized VM options")                                 \
2533                                                                             \
2534   product(bool, PrintCommandLineFlags, false,                               \
2535           "Print flags specified on command line or set by ergonomics")     \
2536                                                                             \
2537   product(bool, PrintFlagsInitial, false,                                   \
2538           "Print all VM flags before argument processing and exit VM")      \
2539                                                                             \
2540   product(bool, PrintFlagsFinal, false,                                     \
2541           "Print all VM flags after argument and ergonomic processing")     \
2542                                                                             \
2543   notproduct(bool, PrintFlagsWithComments, false,                           \
2544           "Print all VM flags with default values and descriptions and "    \
2545           "exit")                                                           \
2546                                                                             \
2547   product(bool, PrintFlagsRanges, false,                                    \
2548           "Print VM flags and their ranges and exit VM")                    \
2549                                                                             \
2550   diagnostic(bool, SerializeVMOutput, true,                                 \
2551           "Use a mutex to serialize output to tty and LogFile")             \
2552                                                                             \
2553   diagnostic(bool, DisplayVMOutput, true,                                   \
2554           "Display all VM output on the tty, independently of LogVMOutput") \
2555                                                                             \
2556   diagnostic(bool, LogVMOutput, false,                                      \
2557           "Save VM output to LogFile")                                      \
2558                                                                             \
2559   diagnostic(ccstr, LogFile, NULL,                                          \
2560           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2561           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2562                                                                             \
2563   product(ccstr, ErrorFile, NULL,                                           \
2564           "If an error occurs, save the error data to this file "           \
2565           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2566                                                                             \
2567   product(bool, DisplayVMOutputToStderr, false,                             \
2568           "If DisplayVMOutput is true, display all VM output to stderr")    \
2569                                                                             \
2570   product(bool, DisplayVMOutputToStdout, false,                             \
2571           "If DisplayVMOutput is true, display all VM output to stdout")    \
2572                                                                             \
2573   product(bool, UseHeavyMonitors, false,                                    \
2574           "use heavyweight instead of lightweight Java monitors")           \
2575                                                                             \
2576   product(bool, PrintStringTableStatistics, false,                          \
2577           "print statistics about the StringTable and SymbolTable")         \
2578                                                                             \
2579   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2580           "verify StringTable contents at exit")                            \
2581                                                                             \
2582   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2583           "print histogram of the symbol table")                            \
2584                                                                             \
2585   notproduct(bool, ExitVMOnVerifyError, false,                              \
2586           "standard exit from VM if bytecode verify error "                 \
2587           "(only in debug mode)")                                           \
2588                                                                             \
2589   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2590           "Call fatal if this exception is thrown.  Example: "              \
2591           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2592                                                                             \
2593   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2594           "Call fatal if the exception pointed by AbortVMOnException "      \
2595           "has this message")                                               \
2596                                                                             \
2597   develop(bool, DebugVtables, false,                                        \
2598           "add debugging code to vtable dispatch")                          \
2599                                                                             \
2600   notproduct(bool, PrintVtableStats, false,                                 \
2601           "print vtables stats at end of run")                              \
2602                                                                             \
2603   develop(bool, TraceCreateZombies, false,                                  \
2604           "trace creation of zombie nmethods")                              \
2605                                                                             \
2606   notproduct(bool, IgnoreLockingAssertions, false,                          \
2607           "disable locking assertions (for speed)")                         \
2608                                                                             \
2609   product(bool, RangeCheckElimination, true,                                \
2610           "Eliminate range checks")                                         \
2611                                                                             \
2612   develop_pd(bool, UncommonNullCast,                                        \
2613           "track occurrences of null in casts; adjust compiler tactics")    \
2614                                                                             \
2615   develop(bool, TypeProfileCasts,  true,                                    \
2616           "treat casts like calls for purposes of type profiling")          \
2617                                                                             \
2618   develop(bool, DelayCompilationDuringStartup, true,                        \
2619           "Delay invoking the compiler until main application class is "    \
2620           "loaded")                                                         \
2621                                                                             \
2622   develop(bool, CompileTheWorld, false,                                     \
2623           "Compile all methods in all classes in bootstrap class path "     \
2624             "(stress test)")                                                \
2625                                                                             \
2626   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2627           "Preload all classes used by a class before start loading")       \
2628                                                                             \
2629   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2630           "Force a safepoint every n compiles so sweeper can keep up")      \
2631                                                                             \
2632   develop(bool, FillDelaySlots, true,                                       \
2633           "Fill delay slots (on SPARC only)")                               \
2634                                                                             \
2635   develop(bool, TimeLivenessAnalysis, false,                                \
2636           "Time computation of bytecode liveness analysis")                 \
2637                                                                             \
2638   develop(bool, TraceLivenessGen, false,                                    \
2639           "Trace the generation of liveness analysis information")          \
2640                                                                             \
2641   notproduct(bool, TraceLivenessQuery, false,                               \
2642           "Trace queries of liveness analysis information")                 \
2643                                                                             \
2644   notproduct(bool, CollectIndexSetStatistics, false,                        \
2645           "Collect information about IndexSets")                            \
2646                                                                             \
2647   develop(bool, UseLoopSafepoints, true,                                    \
2648           "Generate Safepoint nodes in every loop")                         \
2649                                                                             \
2650   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2651           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2652           "Inline allocations larger than this in doublewords must go slow")\
2653                                                                             \
2654   product(bool, AggressiveOpts, false,                                      \
2655           "Enable aggressive optimizations - see arguments.cpp")            \
2656                                                                             \
2657   product_pd(bool, CompactStrings,                                          \
2658           "Enable Strings to use single byte chars in backing store")       \
2659                                                                             \
2660   product_pd(uintx, TypeProfileLevel,                                       \
2661           "=XYZ, with Z: Type profiling of arguments at call; "             \
2662                      "Y: Type profiling of return value at call; "          \
2663                      "X: Type profiling of parameters to methods; "         \
2664           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2665           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2666                                                                             \
2667   product(intx, TypeProfileArgsLimit,     2,                                \
2668           "max number of call arguments to consider for type profiling")    \
2669           range(0, 16)                                                      \
2670                                                                             \
2671   product(intx, TypeProfileParmsLimit,    2,                                \
2672           "max number of incoming parameters to consider for type profiling"\
2673           ", -1 for all")                                                   \
2674           range(-1, 64)                                                     \
2675                                                                             \
2676   /* statistics */                                                          \
2677   develop(bool, CountCompiledCalls, false,                                  \
2678           "Count method invocations")                                       \
2679                                                                             \
2680   notproduct(bool, CountRuntimeCalls, false,                                \
2681           "Count VM runtime calls")                                         \
2682                                                                             \
2683   develop(bool, CountJNICalls, false,                                       \
2684           "Count jni method invocations")                                   \
2685                                                                             \
2686   notproduct(bool, CountJVMCalls, false,                                    \
2687           "Count jvm method invocations")                                   \
2688                                                                             \
2689   notproduct(bool, CountRemovableExceptions, false,                         \
2690           "Count exceptions that could be replaced by branches due to "     \
2691           "inlining")                                                       \
2692                                                                             \
2693   notproduct(bool, ICMissHistogram, false,                                  \
2694           "Produce histogram of IC misses")                                 \
2695                                                                             \
2696   /* interpreter */                                                         \
2697   product_pd(bool, RewriteBytecodes,                                        \
2698           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2699                                                                             \
2700   product_pd(bool, RewriteFrequentPairs,                                    \
2701           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2702                                                                             \
2703   diagnostic(bool, PrintInterpreter, false,                                 \
2704           "Print the generated interpreter code")                           \
2705                                                                             \
2706   product(bool, UseInterpreter, true,                                       \
2707           "Use interpreter for non-compiled methods")                       \
2708                                                                             \
2709   develop(bool, UseFastSignatureHandlers, true,                             \
2710           "Use fast signature handlers for native calls")                   \
2711                                                                             \
2712   product(bool, UseLoopCounter, true,                                       \
2713           "Increment invocation counter on backward branch")                \
2714                                                                             \
2715   product_pd(bool, UseOnStackReplacement,                                   \
2716           "Use on stack replacement, calls runtime if invoc. counter "      \
2717           "overflows in loop")                                              \
2718                                                                             \
2719   notproduct(bool, TraceOnStackReplacement, false,                          \
2720           "Trace on stack replacement")                                     \
2721                                                                             \
2722   product_pd(bool, PreferInterpreterNativeStubs,                            \
2723           "Use always interpreter stubs for native methods invoked via "    \
2724           "interpreter")                                                    \
2725                                                                             \
2726   develop(bool, CountBytecodes, false,                                      \
2727           "Count number of bytecodes executed")                             \
2728                                                                             \
2729   develop(bool, PrintBytecodeHistogram, false,                              \
2730           "Print histogram of the executed bytecodes")                      \
2731                                                                             \
2732   develop(bool, PrintBytecodePairHistogram, false,                          \
2733           "Print histogram of the executed bytecode pairs")                 \
2734                                                                             \
2735   diagnostic(bool, PrintSignatureHandlers, false,                           \
2736           "Print code generated for native method signature handlers")      \
2737                                                                             \
2738   develop(bool, VerifyOops, false,                                          \
2739           "Do plausibility checks for oops")                                \
2740                                                                             \
2741   develop(bool, CheckUnhandledOops, false,                                  \
2742           "Check for unhandled oops in VM code")                            \
2743                                                                             \
2744   develop(bool, VerifyJNIFields, trueInDebug,                               \
2745           "Verify jfieldIDs for instance fields")                           \
2746                                                                             \
2747   notproduct(bool, VerifyJNIEnvThread, false,                               \
2748           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2749           "from JNI")                                                       \
2750                                                                             \
2751   develop(bool, VerifyFPU, false,                                           \
2752           "Verify FPU state (check for NaN's, etc.)")                       \
2753                                                                             \
2754   develop(bool, VerifyThread, false,                                        \
2755           "Watch the thread register for corruption (SPARC only)")          \
2756                                                                             \
2757   develop(bool, VerifyActivationFrameSize, false,                           \
2758           "Verify that activation frame didn't become smaller than its "    \
2759           "minimal size")                                                   \
2760                                                                             \
2761   develop(bool, TraceFrequencyInlining, false,                              \
2762           "Trace frequency based inlining")                                 \
2763                                                                             \
2764   develop_pd(bool, InlineIntrinsics,                                        \
2765           "Inline intrinsics that can be statically resolved")              \
2766                                                                             \
2767   product_pd(bool, ProfileInterpreter,                                      \
2768           "Profile at the bytecode level during interpretation")            \
2769                                                                             \
2770   develop(bool, TraceProfileInterpreter, false,                             \
2771           "Trace profiling at the bytecode level during interpretation. "   \
2772           "This outputs the profiling information collected to improve "    \
2773           "jit compilation.")                                               \
2774                                                                             \
2775   develop_pd(bool, ProfileTraps,                                            \
2776           "Profile deoptimization traps at the bytecode level")             \
2777                                                                             \
2778   product(intx, ProfileMaturityPercentage, 20,                              \
2779           "number of method invocations/branches (expressed as % of "       \
2780           "CompileThreshold) before using the method's profile")            \
2781           range(0, 100)                                                     \
2782                                                                             \
2783   diagnostic(bool, PrintMethodData, false,                                  \
2784           "Print the results of +ProfileInterpreter at end of run")         \
2785                                                                             \
2786   develop(bool, VerifyDataPointer, trueInDebug,                             \
2787           "Verify the method data pointer during interpreter profiling")    \
2788                                                                             \
2789   develop(bool, VerifyCompiledCode, false,                                  \
2790           "Include miscellaneous runtime verifications in nmethod code; "   \
2791           "default off because it disturbs nmethod size heuristics")        \
2792                                                                             \
2793   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2794           "Manually make GC thread crash then dump java stack trace;  "     \
2795           "Test only")                                                      \
2796                                                                             \
2797   /* compilation */                                                         \
2798   product(bool, UseCompiler, true,                                          \
2799           "Use Just-In-Time compilation")                                   \
2800                                                                             \
2801   develop(bool, TraceCompilationPolicy, false,                              \
2802           "Trace compilation policy")                                       \
2803                                                                             \
2804   develop(bool, TimeCompilationPolicy, false,                               \
2805           "Time the compilation policy")                                    \
2806                                                                             \
2807   product(bool, UseCounterDecay, true,                                      \
2808           "Adjust recompilation counters")                                  \
2809                                                                             \
2810   develop(intx, CounterHalfLifeTime,    30,                                 \
2811           "Half-life time of invocation counters (in seconds)")             \
2812                                                                             \
2813   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2814           "The minimum interval (in milliseconds) between invocation of "   \
2815           "CounterDecay")                                                   \
2816                                                                             \
2817   product(bool, AlwaysCompileLoopMethods, false,                            \
2818           "When using recompilation, never interpret methods "              \
2819           "containing loops")                                               \
2820                                                                             \
2821   product(bool, DontCompileHugeMethods, true,                               \
2822           "Do not compile methods > HugeMethodLimit")                       \
2823                                                                             \
2824   /* Bytecode escape analysis estimation. */                                \
2825   product(bool, EstimateArgEscape, true,                                    \
2826           "Analyze bytecodes to estimate escape state of arguments")        \
2827                                                                             \
2828   product(intx, BCEATraceLevel, 0,                                          \
2829           "How much tracing to do of bytecode escape analysis estimates "   \
2830           "(0-3)")                                                          \
2831           range(0, 3)                                                       \
2832                                                                             \
2833   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2834           "Maximum number of nested calls that are analyzed by BC EA")      \
2835           range(0, max_jint)                                                \
2836                                                                             \
2837   product(intx, MaxBCEAEstimateSize, 150,                                   \
2838           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2839           range(0, max_jint)                                                \
2840                                                                             \
2841   product(intx,  AllocatePrefetchStyle, 1,                                  \
2842           "0 = no prefetch, "                                               \
2843           "1 = generate prefetch instructions for each allocation, "        \
2844           "2 = use TLAB watermark to gate allocation prefetch, "            \
2845           "3 = generate one prefetch instruction per cache line")           \
2846           range(0, 3)                                                       \
2847                                                                             \
2848   product(intx,  AllocatePrefetchDistance, -1,                              \
2849           "Distance to prefetch ahead of allocation pointer. "              \
2850           "-1: use system-specific value (automatically determined")        \
2851           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2852                                                                             \
2853   product(intx,  AllocatePrefetchLines, 3,                                  \
2854           "Number of lines to prefetch ahead of array allocation pointer")  \
2855           range(1, 64)                                                      \
2856                                                                             \
2857   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2858           "Number of lines to prefetch ahead of instance allocation "       \
2859           "pointer")                                                        \
2860           range(1, 64)                                                      \
2861                                                                             \
2862   product(intx,  AllocatePrefetchStepSize, 16,                              \
2863           "Step size in bytes of sequential prefetch instructions")         \
2864           range(1, 512)                                                     \
2865           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2866                                                                             \
2867   product(intx,  AllocatePrefetchInstr, 0,                                  \
2868           "Select instruction to prefetch ahead of allocation pointer")     \
2869           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2870                                                                             \
2871   /* deoptimization */                                                      \
2872   develop(bool, TraceDeoptimization, false,                                 \
2873           "Trace deoptimization")                                           \
2874                                                                             \
2875   develop(bool, PrintDeoptimizationDetails, false,                          \
2876           "Print more information about deoptimization")                    \
2877                                                                             \
2878   develop(bool, DebugDeoptimization, false,                                 \
2879           "Tracing various information while debugging deoptimization")     \
2880                                                                             \
2881   product(intx, SelfDestructTimer, 0,                                       \
2882           "Will cause VM to terminate after a given time (in minutes) "     \
2883           "(0 means off)")                                                  \
2884           range(0, max_intx)                                                \
2885                                                                             \
2886   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2887           "The maximum number of lines in the stack trace for Java "        \
2888           "exceptions (0 means all)")                                       \
2889           range(0, max_jint/2)                                              \
2890                                                                             \
2891   /* notice: the max range value here is max_jint, not max_intx  */         \
2892   /* because of overflow issue                                   */         \
2893   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2894           "Guarantee a safepoint (at least) every so many milliseconds "    \
2895           "(0 means none)")                                                 \
2896           range(0, max_jint)                                                \
2897                                                                             \
2898   product(intx, SafepointTimeoutDelay, 10000,                               \
2899           "Delay in milliseconds for option SafepointTimeout")              \
2900   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2901   NOT_LP64(range(0, max_intx))                                              \
2902                                                                             \
2903   product(intx, NmethodSweepActivity, 10,                                   \
2904           "Removes cold nmethods from code cache if > 0. Higher values "    \
2905           "result in more aggressive sweeping")                             \
2906           range(0, 2000)                                                    \
2907                                                                             \
2908   notproduct(bool, LogSweeper, false,                                       \
2909           "Keep a ring buffer of sweeper activity")                         \
2910                                                                             \
2911   notproduct(intx, SweeperLogEntries, 1024,                                 \
2912           "Number of records in the ring buffer of sweeper activity")       \
2913                                                                             \
2914   notproduct(intx, MemProfilingInterval, 500,                               \
2915           "Time between each invocation of the MemProfiler")                \
2916                                                                             \
2917   develop(intx, MallocCatchPtr, -1,                                         \
2918           "Hit breakpoint when mallocing/freeing this pointer")             \
2919                                                                             \
2920   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2921           "List of assertions (file:line) to muzzle")                       \
2922                                                                             \
2923   develop(intx, StackPrintLimit, 100,                                       \
2924           "number of stack frames to print in VM-level stack dump")         \
2925                                                                             \
2926   notproduct(intx, MaxElementPrintSize, 256,                                \
2927           "maximum number of elements to print")                            \
2928                                                                             \
2929   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2930           "maximum number of subklasses to print when printing klass")      \
2931                                                                             \
2932   product(intx, MaxInlineLevel, 9,                                          \
2933           "maximum number of nested calls that are inlined")                \
2934           range(0, max_jint)                                                \
2935                                                                             \
2936   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2937           "maximum number of nested recursive calls that are inlined")      \
2938           range(0, max_jint)                                                \
2939                                                                             \
2940   develop(intx, MaxForceInlineLevel, 100,                                   \
2941           "maximum number of nested calls that are forced for inlining "    \
2942           "(using CompileCommand or marked w/ @ForceInline)")               \
2943           range(0, max_jint)                                                \
2944                                                                             \
2945   product_pd(intx, InlineSmallCode,                                         \
2946           "Only inline already compiled methods if their code size is "     \
2947           "less than this")                                                 \
2948           range(0, max_jint)                                                \
2949                                                                             \
2950   product(intx, MaxInlineSize, 35,                                          \
2951           "The maximum bytecode size of a method to be inlined")            \
2952           range(0, max_jint)                                                \
2953                                                                             \
2954   product_pd(intx, FreqInlineSize,                                          \
2955           "The maximum bytecode size of a frequent method to be inlined")   \
2956           range(0, max_jint)                                                \
2957                                                                             \
2958   product(intx, MaxTrivialSize, 6,                                          \
2959           "The maximum bytecode size of a trivial method to be inlined")    \
2960           range(0, max_jint)                                                \
2961                                                                             \
2962   product(intx, MinInliningThreshold, 250,                                  \
2963           "The minimum invocation count a method needs to have to be "      \
2964           "inlined")                                                        \
2965           range(0, max_jint)                                                \
2966                                                                             \
2967   develop(intx, MethodHistogramCutoff, 100,                                 \
2968           "The cutoff value for method invocation histogram (+CountCalls)") \
2969                                                                             \
2970   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2971           "Number of interpreted methods to show in profile")               \
2972                                                                             \
2973   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2974           "Number of compiled methods to show in profile")                  \
2975                                                                             \
2976   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2977           "Number of stub methods to show in profile")                      \
2978                                                                             \
2979   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2980           "Number of runtime stub nodes to show in profile")                \
2981                                                                             \
2982   product(intx, ProfileIntervalsTicks, 100,                                 \
2983           "Number of ticks between printing of interval profile "           \
2984           "(+ProfileIntervals)")                                            \
2985           range(0, max_intx)                                                \
2986                                                                             \
2987   notproduct(intx, ScavengeALotInterval,     1,                             \
2988           "Interval between which scavenge will occur with +ScavengeALot")  \
2989                                                                             \
2990   notproduct(intx, FullGCALotInterval,     1,                               \
2991           "Interval between which full gc will occur with +FullGCALot")     \
2992                                                                             \
2993   notproduct(intx, FullGCALotStart,     0,                                  \
2994           "For which invocation to start FullGCAlot")                       \
2995                                                                             \
2996   notproduct(intx, FullGCALotDummies,  32*K,                                \
2997           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2998           "to move")                                                        \
2999                                                                             \
3000   develop(intx, DontYieldALotInterval,    10,                               \
3001           "Interval between which yields will be dropped (milliseconds)")   \
3002                                                                             \
3003   develop(intx, ProfilerPCTickThreshold,    15,                             \
3004           "Number of ticks in a PC buckets to be a hotspot")                \
3005                                                                             \
3006   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3007           "Number of exits until DeoptimizeALot kicks in")                  \
3008                                                                             \
3009   notproduct(intx, ZombieALotInterval,     5,                               \
3010           "Number of exits until ZombieALot kicks in")                      \
3011                                                                             \
3012   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3013           "If non-zero, maximum number of words that malloc/realloc can "   \
3014           "allocate (for testing only)")                                    \
3015           range(0, max_uintx)                                               \
3016                                                                             \
3017   product(intx, TypeProfileWidth, 2,                                        \
3018           "Number of receiver types to record in call/cast profile")        \
3019           range(0, 8)                                                       \
3020                                                                             \
3021   develop(intx, BciProfileWidth,      2,                                    \
3022           "Number of return bci's to record in ret profile")                \
3023                                                                             \
3024   product(intx, PerMethodRecompilationCutoff, 400,                          \
3025           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3026           range(-1, max_intx)                                               \
3027                                                                             \
3028   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3029           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3030           range(-1, max_intx)                                               \
3031                                                                             \
3032   product(intx, PerMethodTrapLimit,  100,                                   \
3033           "Limit on traps (of one kind) in a method (includes inlines)")    \
3034           range(0, max_jint)                                                \
3035                                                                             \
3036   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3037           "Limit on speculative traps (of one kind) in a method "           \
3038           "(includes inlines)")                                             \
3039           range(0, max_jint)                                                \
3040                                                                             \
3041   product(intx, PerBytecodeTrapLimit,  4,                                   \
3042           "Limit on traps (of one kind) at a particular BCI")               \
3043           range(0, max_jint)                                                \
3044                                                                             \
3045   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3046           "Extra method data trap entries for speculation")                 \
3047                                                                             \
3048   develop(intx, InlineFrequencyRatio,    20,                                \
3049           "Ratio of call site execution to caller method invocation")       \
3050           range(0, max_jint)                                                \
3051                                                                             \
3052   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3053           "Count of call site execution necessary to trigger frequent "     \
3054           "inlining")                                                       \
3055           range(0, max_jint)                                                \
3056                                                                             \
3057   develop(intx, InlineThrowCount,    50,                                    \
3058           "Force inlining of interpreted methods that throw this often")    \
3059           range(0, max_jint)                                                \
3060                                                                             \
3061   develop(intx, InlineThrowMaxSize,   200,                                  \
3062           "Force inlining of throwing methods smaller than this")           \
3063           range(0, max_jint)                                                \
3064                                                                             \
3065   develop(intx, ProfilerNodeSize,  1024,                                    \
3066           "Size in K to allocate for the Profile Nodes of each thread")     \
3067           range(0, 1024)                                                    \
3068                                                                             \
3069   /* gc parameters */                                                       \
3070   product(size_t, InitialHeapSize, 0,                                       \
3071           "Initial heap size (in bytes); zero means use ergonomics")        \
3072           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3073                                                                             \
3074   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3075           "Maximum heap size (in bytes)")                                   \
3076           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3077                                                                             \
3078   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3079           "Initial tenured generation size (in bytes)")                     \
3080           range(0, max_uintx)                                               \
3081                                                                             \
3082   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3083           "Initial new generation size (in bytes)")                         \
3084           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3085                                                                             \
3086   product(size_t, MaxNewSize, max_uintx,                                    \
3087           "Maximum new generation size (in bytes), max_uintx means set "    \
3088           "ergonomically")                                                  \
3089           range(0, max_uintx)                                               \
3090                                                                             \
3091   product_pd(size_t, HeapBaseMinAddress,                                    \
3092           "OS specific low limit for heap base address")                    \
3093           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3094                                                                             \
3095   product(size_t, PretenureSizeThreshold, 0,                                \
3096           "Maximum size in bytes of objects allocated in DefNew "           \
3097           "generation; zero means no maximum")                              \
3098           range(0, max_uintx)                                               \
3099                                                                             \
3100   product(size_t, MinTLABSize, 2*K,                                         \
3101           "Minimum allowed TLAB size (in bytes)")                           \
3102           range(1, max_uintx/2)                                             \
3103           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3104                                                                             \
3105   product(size_t, TLABSize, 0,                                              \
3106           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3107           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3108                                                                             \
3109   product(size_t, YoungPLABSize, 4096,                                      \
3110           "Size of young gen promotion LAB's (in HeapWords)")               \
3111           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3112                                                                             \
3113   product(size_t, OldPLABSize, 1024,                                        \
3114           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3115           "of blocks to attempt to claim when refilling CMS LAB's")         \
3116           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3117                                                                             \
3118   product(uintx, TLABAllocationWeight, 35,                                  \
3119           "Allocation averaging weight")                                    \
3120           range(0, 100)                                                     \
3121                                                                             \
3122   /* Limit the lower bound of this flag to 1 as it is used  */              \
3123   /* in a division expression.                              */              \
3124   product(uintx, TLABWasteTargetPercent, 1,                                 \
3125           "Percentage of Eden that can be wasted")                          \
3126           range(1, 100)                                                     \
3127                                                                             \
3128   product(uintx, TLABRefillWasteFraction,    64,                            \
3129           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3130           range(1, max_juint)                                               \
3131                                                                             \
3132   product(uintx, TLABWasteIncrement,    4,                                  \
3133           "Increment allowed waste at slow allocation")                     \
3134           range(0, max_jint)                                                \
3135           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3136                                                                             \
3137   product(uintx, SurvivorRatio, 8,                                          \
3138           "Ratio of eden/survivor space size")                              \
3139           range(1, max_uintx-2)                                             \
3140           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3141                                                                             \
3142   product(uintx, NewRatio, 2,                                               \
3143           "Ratio of old/new generation sizes")                              \
3144           range(0, max_uintx-1)                                             \
3145                                                                             \
3146   product_pd(size_t, NewSizeThreadIncrease,                                 \
3147           "Additional size added to desired new generation size per "       \
3148           "non-daemon thread (in bytes)")                                   \
3149           range(0, max_uintx)                                               \
3150                                                                             \
3151   product_pd(size_t, MetaspaceSize,                                         \
3152           "Initial threshold (in bytes) at which a garbage collection "     \
3153           "is done to reduce Metaspace usage")                              \
3154           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3155                                                                             \
3156   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3157           "Maximum size of Metaspaces (in bytes)")                          \
3158           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3159                                                                             \
3160   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3161           "Maximum size of class area in Metaspace when compressed "        \
3162           "class pointers are used")                                        \
3163           range(1*M, 3*G)                                                   \
3164                                                                             \
3165   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3166           "The minimum percentage of heap free after GC to avoid expansion."\
3167           " For most GCs this applies to the old generation. In G1 and"     \
3168           " ParallelGC it applies to the whole heap.")                      \
3169           range(0, 100)                                                     \
3170           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3171                                                                             \
3172   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3173           "The maximum percentage of heap free after GC to avoid shrinking."\
3174           " For most GCs this applies to the old generation. In G1 and"     \
3175           " ParallelGC it applies to the whole heap.")                      \
3176           range(0, 100)                                                     \
3177           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3178                                                                             \
3179   product(bool, ShrinkHeapInSteps, true,                                    \
3180           "When disabled, informs the GC to shrink the java heap directly"  \
3181           " to the target size at the next full GC rather than requiring"   \
3182           " smaller steps during multiple full GCs.")                       \
3183                                                                             \
3184   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3185           "Number of milliseconds per MB of free space in the heap")        \
3186           range(0, max_intx)                                                \
3187           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3188                                                                             \
3189   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3190           "The minimum change in heap space due to GC (in bytes)")          \
3191           range(0, max_uintx)                                               \
3192                                                                             \
3193   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3194           "The minimum expansion of Metaspace (in bytes)")                  \
3195           range(0, max_uintx)                                               \
3196                                                                             \
3197   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3198           "The maximum percentage of Metaspace free after GC to avoid "     \
3199           "shrinking")                                                      \
3200           range(0, 100)                                                     \
3201           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3202                                                                             \
3203   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3204           "The minimum percentage of Metaspace free after GC to avoid "     \
3205           "expansion")                                                      \
3206           range(0, 99)                                                      \
3207           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3208                                                                             \
3209   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3210           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3211           range(0, max_uintx)                                               \
3212                                                                             \
3213   product(uintx, QueuedAllocationWarningCount, 0,                           \
3214           "Number of times an allocation that queues behind a GC "          \
3215           "will retry before printing a warning")                           \
3216           range(0, max_uintx)                                               \
3217                                                                             \
3218   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3219           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3220           range(0, max_uintx)                                               \
3221                                                                             \
3222   diagnostic(intx, VerifyGCLevel,     0,                                    \
3223           "Generation level at which to start +VerifyBefore/AfterGC")       \
3224           range(0, 1)                                                       \
3225                                                                             \
3226   product(uintx, MaxTenuringThreshold,    15,                               \
3227           "Maximum value for tenuring threshold")                           \
3228           range(0, markOopDesc::max_age + 1)                                \
3229           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3230                                                                             \
3231   product(uintx, InitialTenuringThreshold,    7,                            \
3232           "Initial value for tenuring threshold")                           \
3233           range(0, markOopDesc::max_age + 1)                                \
3234           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3235                                                                             \
3236   product(uintx, TargetSurvivorRatio,    50,                                \
3237           "Desired percentage of survivor space used after scavenge")       \
3238           range(0, 100)                                                     \
3239                                                                             \
3240   product(uintx, MarkSweepDeadRatio,     5,                                 \
3241           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3242           "Serial mark sweep treats this as both the minimum and maximum "  \
3243           "value. "                                                         \
3244           "CMS uses this value only if it falls back to mark sweep. "       \
3245           "Par compact uses a variable scale based on the density of the "  \
3246           "generation and treats this as the maximum value when the heap "  \
3247           "is either completely full or completely empty.  Par compact "    \
3248           "also has a smaller default value; see arguments.cpp.")           \
3249           range(0, 100)                                                     \
3250                                                                             \
3251   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3252           "How often should we fully compact the heap (ignoring the dead "  \
3253           "space parameters)")                                              \
3254           range(1, max_juint)                                               \
3255                                                                             \
3256   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3257           "Delay between expansion and allocation (in milliseconds)")       \
3258                                                                             \
3259   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3260           "Delay in scheduling GC workers (in milliseconds)")               \
3261                                                                             \
3262   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3263           "(Unstable) Number of times to iterate in safepoint loop "        \
3264           "before blocking VM threads ")                                    \
3265           range(-1, max_jint-1)                                             \
3266                                                                             \
3267   product(intx, DeferPollingPageLoopCount,     -1,                          \
3268           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3269           "before changing safepoint polling page to RO ")                  \
3270           range(-1, max_jint-1)                                             \
3271                                                                             \
3272   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3273           range(0, max_intx)                                                \
3274                                                                             \
3275   product(bool, PSChunkLargeArrays, true,                                   \
3276           "Process large arrays in chunks")                                 \
3277                                                                             \
3278   product(uintx, GCDrainStackTargetSize, 64,                                \
3279           "Number of entries we will try to leave on the stack "            \
3280           "during parallel gc")                                             \
3281           range(0, max_juint)                                               \
3282                                                                             \
3283   /* stack parameters */                                                    \
3284   product_pd(intx, StackYellowPages,                                        \
3285           "Number of yellow zone (recoverable overflows) pages of size "    \
3286           "4KB. If pages are bigger yellow zone is aligned up.")            \
3287           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3288                                                                             \
3289   product_pd(intx, StackRedPages,                                           \
3290           "Number of red zone (unrecoverable overflows) pages of size "     \
3291           "4KB. If pages are bigger red zone is aligned up.")               \
3292           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3293                                                                             \
3294   product_pd(intx, StackReservedPages,                                      \
3295           "Number of reserved zone (reserved to annotated methods) pages"   \
3296           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3297           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3298                                                                             \
3299   product(bool, RestrictReservedStack, true,                                \
3300           "Restrict @ReservedStackAccess to trusted classes")               \
3301                                                                             \
3302   /* greater stack shadow pages can't generate instruction to bang stack */ \
3303   product_pd(intx, StackShadowPages,                                        \
3304           "Number of shadow zone (for overflow checking) pages of size "    \
3305           "4KB. If pages are bigger shadow zone is aligned up. "            \
3306           "This should exceed the depth of the VM and native call stack.")  \
3307           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3308                                                                             \
3309   product_pd(intx, ThreadStackSize,                                         \
3310           "Thread Stack Size (in Kbytes)")                                  \
3311           range(0, 1 * M)                                                   \
3312                                                                             \
3313   product_pd(intx, VMThreadStackSize,                                       \
3314           "Non-Java Thread Stack Size (in Kbytes)")                         \
3315           range(0, max_intx/(1 * K))                                        \
3316                                                                             \
3317   product_pd(intx, CompilerThreadStackSize,                                 \
3318           "Compiler Thread Stack Size (in Kbytes)")                         \
3319           range(0, max_intx/(1 * K))                                        \
3320                                                                             \
3321   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3322           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3323                                                                             \
3324   /* code cache parameters                                    */            \
3325   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3326           "Code cache segment size (in bytes) - smallest unit of "          \
3327           "allocation")                                                     \
3328           range(1, 1024)                                                    \
3329           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3330                                                                             \
3331   develop_pd(intx, CodeEntryAlignment,                                      \
3332           "Code entry alignment for generated code (in bytes)")             \
3333           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3334                                                                             \
3335   product_pd(intx, OptoLoopAlignment,                                       \
3336           "Align inner loops to zero relative to this modulus")             \
3337           range(1, 16)                                                      \
3338           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3339                                                                             \
3340   product_pd(uintx, InitialCodeCacheSize,                                   \
3341           "Initial code cache size (in bytes)")                             \
3342           range(0, max_uintx)                                               \
3343                                                                             \
3344   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3345           "Minimum code cache size (in bytes) required to start VM.")       \
3346           range(0, max_uintx)                                               \
3347                                                                             \
3348   product(bool, SegmentedCodeCache, false,                                  \
3349           "Use a segmented code cache")                                     \
3350                                                                             \
3351   product_pd(uintx, ReservedCodeCacheSize,                                  \
3352           "Reserved code cache size (in bytes) - maximum code cache size")  \
3353           range(0, max_uintx)                                               \
3354                                                                             \
3355   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3356           "Size of code heap with non-profiled methods (in bytes)")         \
3357           range(0, max_uintx)                                               \
3358                                                                             \
3359   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3360           "Size of code heap with profiled methods (in bytes)")             \
3361           range(0, max_uintx)                                               \
3362                                                                             \
3363   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3364           "Size of code heap with non-nmethods (in bytes)")                 \
3365           range(0, max_uintx)                                               \
3366                                                                             \
3367   product_pd(uintx, CodeCacheExpansionSize,                                 \
3368           "Code cache expansion size (in bytes)")                           \
3369           range(0, max_uintx)                                               \
3370                                                                             \
3371   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3372           "Minimum number of segments in a code cache block")               \
3373           range(1, 100)                                                     \
3374                                                                             \
3375   notproduct(bool, ExitOnFullCodeCache, false,                              \
3376           "Exit the VM if we fill the code cache")                          \
3377                                                                             \
3378   product(bool, UseCodeCacheFlushing, true,                                 \
3379           "Remove cold/old nmethods from the code cache")                   \
3380                                                                             \
3381   product(uintx, StartAggressiveSweepingAt, 10,                             \
3382           "Start aggressive sweeping if X[%] of the code cache is free."    \
3383           "Segmented code cache: X[%] of the non-profiled heap."            \
3384           "Non-segmented code cache: X[%] of the total code cache")         \
3385           range(0, 100)                                                     \
3386                                                                             \
3387   /* AOT parameters */                                                      \
3388   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3389           "Use AOT compiled files")                                         \
3390                                                                             \
3391   product(ccstrlist, AOTLibrary, NULL,                                      \
3392           "AOT library")                                                    \
3393                                                                             \
3394   product(bool, PrintAOT, false,                                            \
3395           "Print used AOT klasses and methods")                             \
3396                                                                             \
3397   notproduct(bool, PrintAOTStatistics, false,                               \
3398           "Print AOT statistics")                                           \
3399                                                                             \
3400   diagnostic(bool, UseAOTStrictLoading, false,                              \
3401           "Exit the VM if any of the AOT libraries has invalid config")     \
3402                                                                             \
3403   product(bool, CalculateClassFingerprint, false,                           \
3404           "Calculate class fingerprint")                                    \
3405                                                                             \
3406   /* interpreter debugging */                                               \
3407   develop(intx, BinarySwitchThreshold, 5,                                   \
3408           "Minimal number of lookupswitch entries for rewriting to binary " \
3409           "switch")                                                         \
3410                                                                             \
3411   develop(intx, StopInterpreterAt, 0,                                       \
3412           "Stop interpreter execution at specified bytecode number")        \
3413                                                                             \
3414   develop(intx, TraceBytecodesAt, 0,                                        \
3415           "Trace bytecodes starting with specified bytecode number")        \
3416                                                                             \
3417   /* compiler interface */                                                  \
3418   develop(intx, CIStart, 0,                                                 \
3419           "The id of the first compilation to permit")                      \
3420                                                                             \
3421   develop(intx, CIStop, max_jint,                                           \
3422           "The id of the last compilation to permit")                       \
3423                                                                             \
3424   develop(intx, CIStartOSR, 0,                                              \
3425           "The id of the first osr compilation to permit "                  \
3426           "(CICountOSR must be on)")                                        \
3427                                                                             \
3428   develop(intx, CIStopOSR, max_jint,                                        \
3429           "The id of the last osr compilation to permit "                   \
3430           "(CICountOSR must be on)")                                        \
3431                                                                             \
3432   develop(intx, CIBreakAtOSR, -1,                                           \
3433           "The id of osr compilation to break at")                          \
3434                                                                             \
3435   develop(intx, CIBreakAt, -1,                                              \
3436           "The id of compilation to break at")                              \
3437                                                                             \
3438   product(ccstrlist, CompileOnly, "",                                       \
3439           "List of methods (pkg/class.name) to restrict compilation to")    \
3440                                                                             \
3441   product(ccstr, CompileCommandFile, NULL,                                  \
3442           "Read compiler commands from this file [.hotspot_compiler]")      \
3443                                                                             \
3444   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3445           "Read compiler directives from this file")                        \
3446                                                                             \
3447   product(ccstrlist, CompileCommand, "",                                    \
3448           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3449                                                                             \
3450   develop(bool, ReplayCompiles, false,                                      \
3451           "Enable replay of compilations from ReplayDataFile")              \
3452                                                                             \
3453   product(ccstr, ReplayDataFile, NULL,                                      \
3454           "File containing compilation replay information"                  \
3455           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3456                                                                             \
3457    product(ccstr, InlineDataFile, NULL,                                     \
3458           "File containing inlining replay information"                     \
3459           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3460                                                                             \
3461   develop(intx, ReplaySuppressInitializers, 2,                              \
3462           "Control handling of class initialization during replay: "        \
3463           "0 - don't do anything special; "                                 \
3464           "1 - treat all class initializers as empty; "                     \
3465           "2 - treat class initializers for application classes as empty; " \
3466           "3 - allow all class initializers to run during bootstrap but "   \
3467           "    pretend they are empty after starting replay")               \
3468           range(0, 3)                                                       \
3469                                                                             \
3470   develop(bool, ReplayIgnoreInitErrors, false,                              \
3471           "Ignore exceptions thrown during initialization for replay")      \
3472                                                                             \
3473   product(bool, DumpReplayDataOnError, true,                                \
3474           "Record replay data for crashing compiler threads")               \
3475                                                                             \
3476   product(bool, CICompilerCountPerCPU, false,                               \
3477           "1 compiler thread for log(N CPUs)")                              \
3478                                                                             \
3479   develop(intx, CIFireOOMAt,    -1,                                         \
3480           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3481           "(non-negative value throws OOM after this many CI accesses "     \
3482           "in each compile)")                                               \
3483   notproduct(intx, CICrashAt, -1,                                           \
3484           "id of compilation to trigger assert in compiler thread for "     \
3485           "the purpose of testing, e.g. generation of replay data")         \
3486   notproduct(bool, CIObjectFactoryVerify, false,                            \
3487           "enable potentially expensive verification in ciObjectFactory")   \
3488                                                                             \
3489   /* Priorities */                                                          \
3490   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3491                                                                             \
3492   product(intx, ThreadPriorityPolicy, 0,                                    \
3493           "0 : Normal.                                                     "\
3494           "    VM chooses priorities that are appropriate for normal       "\
3495           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3496           "    to normal native priority. Java priorities below "           \
3497           "    NORM_PRIORITY map to lower native priority values. On       "\
3498           "    Windows applications are allowed to use higher native       "\
3499           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3500           "    not use the highest possible native priority,               "\
3501           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3502           "    system threads. On Linux thread priorities are ignored      "\
3503           "    because the OS does not support static priority in          "\
3504           "    SCHED_OTHER scheduling class which is the only choice for   "\
3505           "    non-root, non-realtime applications.                        "\
3506           "1 : Aggressive.                                                 "\
3507           "    Java thread priorities map over to the entire range of      "\
3508           "    native thread priorities. Higher Java thread priorities map "\
3509           "    to higher native thread priorities. This policy should be   "\
3510           "    used with care, as sometimes it can cause performance       "\
3511           "    degradation in the application and/or the entire system. On "\
3512           "    Linux this policy requires root privilege.")                 \
3513           range(0, 1)                                                       \
3514                                                                             \
3515   product(bool, ThreadPriorityVerbose, false,                               \
3516           "Print priority changes")                                         \
3517                                                                             \
3518   product(intx, CompilerThreadPriority, -1,                                 \
3519           "The native priority at which compiler threads should run "       \
3520           "(-1 means no change)")                                           \
3521           range(min_jint, max_jint)                                         \
3522           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3523                                                                             \
3524   product(intx, VMThreadPriority, -1,                                       \
3525           "The native priority at which the VM thread should run "          \
3526           "(-1 means no change)")                                           \
3527           range(-1, 127)                                                    \
3528                                                                             \
3529   product(bool, CompilerThreadHintNoPreempt, true,                          \
3530           "(Solaris only) Give compiler threads an extra quanta")           \
3531                                                                             \
3532   product(bool, VMThreadHintNoPreempt, false,                               \
3533           "(Solaris only) Give VM thread an extra quanta")                  \
3534                                                                             \
3535   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3536           "Map Java priorities to OS priorities")                           \
3537           range(-1, 127)                                                    \
3538                                                                             \
3539   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3540           "Map Java priorities to OS priorities")                           \
3541           range(-1, 127)                                                    \
3542                                                                             \
3543   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3544           "Map Java priorities to OS priorities")                           \
3545           range(-1, 127)                                                    \
3546                                                                             \
3547   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3548           "Map Java priorities to OS priorities")                           \
3549           range(-1, 127)                                                    \
3550                                                                             \
3551   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3552           "Map Java priorities to OS priorities")                           \
3553           range(-1, 127)                                                    \
3554                                                                             \
3555   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3556           "Map Java priorities to OS priorities")                           \
3557           range(-1, 127)                                                    \
3558                                                                             \
3559   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3560           "Map Java priorities to OS priorities")                           \
3561           range(-1, 127)                                                    \
3562                                                                             \
3563   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3564           "Map Java priorities to OS priorities")                           \
3565           range(-1, 127)                                                    \
3566                                                                             \
3567   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3568           "Map Java priorities to OS priorities")                           \
3569           range(-1, 127)                                                    \
3570                                                                             \
3571   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3572           "Map Java priorities to OS priorities")                           \
3573           range(-1, 127)                                                    \
3574                                                                             \
3575   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3576           "Java thread priority 10 maps to critical scheduling priority")   \
3577                                                                             \
3578   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3579           "Compiler thread(s) run at critical scheduling priority")         \
3580                                                                             \
3581   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3582           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3583                                                                             \
3584   /* compiler debugging */                                                  \
3585   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3586           "First class to consider when using +CompileTheWorld")            \
3587                                                                             \
3588   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3589           "Last class to consider when using +CompileTheWorld")             \
3590                                                                             \
3591   develop(intx, NewCodeParameter,      0,                                   \
3592           "Testing Only: Create a dedicated integer parameter before "      \
3593           "putback")                                                        \
3594                                                                             \
3595   /* new oopmap storage allocation */                                       \
3596   develop(intx, MinOopMapAllocation,     8,                                 \
3597           "Minimum number of OopMap entries in an OopMapSet")               \
3598                                                                             \
3599   /* Background Compilation */                                              \
3600   develop(intx, LongCompileThreshold,     50,                               \
3601           "Used with +TraceLongCompiles")                                   \
3602                                                                             \
3603   /* recompilation */                                                       \
3604   product_pd(intx, CompileThreshold,                                        \
3605           "number of interpreted method invocations before (re-)compiling") \
3606           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3607                                                                             \
3608   product(double, CompileThresholdScaling, 1.0,                             \
3609           "Factor to control when first compilation happens "               \
3610           "(both with and without tiered compilation): "                    \
3611           "values greater than 1.0 delay counter overflow, "                \
3612           "values between 0 and 1.0 rush counter overflow, "                \
3613           "value of 1.0 leaves compilation thresholds unchanged "           \
3614           "value of 0.0 is equivalent to -Xint. "                           \
3615           ""                                                                \
3616           "Flag can be set as per-method option. "                          \
3617           "If a value is specified for a method, compilation thresholds "   \
3618           "for that method are scaled by both the value of the global flag "\
3619           "and the value of the per-method flag.")                          \
3620           range(0.0, DBL_MAX)                                               \
3621                                                                             \
3622   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3623           "Interpreter (tier 0) invocation notification frequency")         \
3624           range(0, 30)                                                      \
3625                                                                             \
3626   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3627           "C1 without MDO (tier 2) invocation notification frequency")      \
3628           range(0, 30)                                                      \
3629                                                                             \
3630   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3631           "C1 with MDO profiling (tier 3) invocation notification "         \
3632           "frequency")                                                      \
3633           range(0, 30)                                                      \
3634                                                                             \
3635   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3636           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3637           range(0, 30)                                                      \
3638                                                                             \
3639   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3640           "Interpreter (tier 0) invocation notification frequency")         \
3641           range(0, 30)                                                      \
3642                                                                             \
3643   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3644           "C1 without MDO (tier 2) invocation notification frequency")      \
3645           range(0, 30)                                                      \
3646                                                                             \
3647   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3648           "C1 with MDO profiling (tier 3) invocation notification "         \
3649           "frequency")                                                      \
3650           range(0, 30)                                                      \
3651                                                                             \
3652   product(intx, Tier2CompileThreshold, 0,                                   \
3653           "threshold at which tier 2 compilation is invoked")               \
3654           range(0, max_jint)                                                \
3655                                                                             \
3656   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3657           "Back edge threshold at which tier 2 compilation is invoked")     \
3658           range(0, max_jint)                                                \
3659                                                                             \
3660   product(intx, Tier3InvocationThreshold, 200,                              \
3661           "Compile if number of method invocations crosses this "           \
3662           "threshold")                                                      \
3663           range(0, max_jint)                                                \
3664                                                                             \
3665   product(intx, Tier3MinInvocationThreshold, 100,                           \
3666           "Minimum invocation to compile at tier 3")                        \
3667           range(0, max_jint)                                                \
3668                                                                             \
3669   product(intx, Tier3CompileThreshold, 2000,                                \
3670           "Threshold at which tier 3 compilation is invoked (invocation "   \
3671           "minimum must be satisfied)")                                     \
3672           range(0, max_jint)                                                \
3673                                                                             \
3674   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3675           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3676           range(0, max_jint)                                                \
3677                                                                             \
3678   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3679           "Compile if number of method invocations crosses this "           \
3680           "threshold if coming from AOT")                                   \
3681           range(0, max_jint)                                                \
3682                                                                             \
3683   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3684           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3685           range(0, max_jint)                                                \
3686                                                                             \
3687   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3688           "Threshold at which tier 3 compilation is invoked (invocation "   \
3689           "minimum must be satisfied) if coming from AOT")                  \
3690           range(0, max_jint)                                                \
3691                                                                             \
3692   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3693           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3694           "if coming from AOT")                                             \
3695           range(0, max_jint)                                                \
3696                                                                             \
3697   product(intx, Tier4InvocationThreshold, 5000,                             \
3698           "Compile if number of method invocations crosses this "           \
3699           "threshold")                                                      \
3700           range(0, max_jint)                                                \
3701                                                                             \
3702   product(intx, Tier4MinInvocationThreshold, 600,                           \
3703           "Minimum invocation to compile at tier 4")                        \
3704           range(0, max_jint)                                                \
3705                                                                             \
3706   product(intx, Tier4CompileThreshold, 15000,                               \
3707           "Threshold at which tier 4 compilation is invoked (invocation "   \
3708           "minimum must be satisfied")                                      \
3709           range(0, max_jint)                                                \
3710                                                                             \
3711   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3712           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3713           range(0, max_jint)                                                \
3714                                                                             \
3715   product(intx, Tier3DelayOn, 5,                                            \
3716           "If C2 queue size grows over this amount per compiler thread "    \
3717           "stop compiling at tier 3 and start compiling at tier 2")         \
3718           range(0, max_jint)                                                \
3719                                                                             \
3720   product(intx, Tier3DelayOff, 2,                                           \
3721           "If C2 queue size is less than this amount per compiler thread "  \
3722           "allow methods compiled at tier 2 transition to tier 3")          \
3723           range(0, max_jint)                                                \
3724                                                                             \
3725   product(intx, Tier3LoadFeedback, 5,                                       \
3726           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3727           "reaches this amount per compiler thread")                        \
3728           range(0, max_jint)                                                \
3729                                                                             \
3730   product(intx, Tier4LoadFeedback, 3,                                       \
3731           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3732           "reaches this amount per compiler thread")                        \
3733           range(0, max_jint)                                                \
3734                                                                             \
3735   product(intx, TieredCompileTaskTimeout, 50,                               \
3736           "Kill compile task if method was not used within "                \
3737           "given timeout in milliseconds")                                  \
3738           range(0, max_intx)                                                \
3739                                                                             \
3740   product(intx, TieredStopAtLevel, 4,                                       \
3741           "Stop at given compilation level")                                \
3742           range(0, 4)                                                       \
3743                                                                             \
3744   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3745           "Start profiling in interpreter if the counters exceed tier 3 "   \
3746           "thresholds by the specified percentage")                         \
3747           range(0, max_jint)                                                \
3748                                                                             \
3749   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3750           "Increase the compile threshold for C1 compilation if the code "  \
3751           "cache is filled by the specified percentage")                    \
3752           range(0, 99)                                                      \
3753                                                                             \
3754   product(intx, TieredRateUpdateMinTime, 1,                                 \
3755           "Minimum rate sampling interval (in milliseconds)")               \
3756           range(0, max_intx)                                                \
3757                                                                             \
3758   product(intx, TieredRateUpdateMaxTime, 25,                                \
3759           "Maximum rate sampling interval (in milliseconds)")               \
3760           range(0, max_intx)                                                \
3761                                                                             \
3762   product_pd(bool, TieredCompilation,                                       \
3763           "Enable tiered compilation")                                      \
3764                                                                             \
3765   product(bool, PrintTieredEvents, false,                                   \
3766           "Print tiered events notifications")                              \
3767                                                                             \
3768   product_pd(intx, OnStackReplacePercentage,                                \
3769           "NON_TIERED number of method invocations/branches (expressed as " \
3770           "% of CompileThreshold) before (re-)compiling OSR code")          \
3771           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3772                                                                             \
3773   product(intx, InterpreterProfilePercentage, 33,                           \
3774           "NON_TIERED number of method invocations/branches (expressed as " \
3775           "% of CompileThreshold) before profiling in the interpreter")     \
3776           range(0, 100)                                                     \
3777                                                                             \
3778   develop(intx, MaxRecompilationSearchLength,    10,                        \
3779           "The maximum number of frames to inspect when searching for "     \
3780           "recompilee")                                                     \
3781                                                                             \
3782   develop(intx, MaxInterpretedSearchLength,     3,                          \
3783           "The maximum number of interpreted frames to skip when searching "\
3784           "for recompilee")                                                 \
3785                                                                             \
3786   develop(intx, DesiredMethodLimit,  8000,                                  \
3787           "The desired maximum method size (in bytecodes) after inlining")  \
3788                                                                             \
3789   develop(intx, HugeMethodLimit,  8000,                                     \
3790           "Don't compile methods larger than this if "                      \
3791           "+DontCompileHugeMethods")                                        \
3792                                                                             \
3793   /* New JDK 1.4 reflection implementation */                               \
3794                                                                             \
3795   develop(intx, FastSuperclassLimit, 8,                                     \
3796           "Depth of hardwired instanceof accelerator array")                \
3797                                                                             \
3798   /* Properties for Java libraries  */                                      \
3799                                                                             \
3800   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3801           "Maximum total size of NIO direct-buffer allocations")            \
3802           range(0, max_jlong)                                               \
3803                                                                             \
3804   /* Flags used for temporary code during development  */                   \
3805                                                                             \
3806   diagnostic(bool, UseNewCode, false,                                       \
3807           "Testing Only: Use the new version while testing")                \
3808                                                                             \
3809   diagnostic(bool, UseNewCode2, false,                                      \
3810           "Testing Only: Use the new version while testing")                \
3811                                                                             \
3812   diagnostic(bool, UseNewCode3, false,                                      \
3813           "Testing Only: Use the new version while testing")                \
3814                                                                             \
3815   /* flags for performance data collection */                               \
3816                                                                             \
3817   product(bool, UsePerfData, true,                                          \
3818           "Flag to disable jvmstat instrumentation for performance testing "\
3819           "and problem isolation purposes")                                 \
3820                                                                             \
3821   product(bool, PerfDataSaveToFile, false,                                  \
3822           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3823                                                                             \
3824   product(ccstr, PerfDataSaveFile, NULL,                                    \
3825           "Save PerfData memory to the specified absolute pathname. "       \
3826           "The string %p in the file name (if present) "                    \
3827           "will be replaced by pid")                                        \
3828                                                                             \
3829   product(intx, PerfDataSamplingInterval, 50,                               \
3830           "Data sampling interval (in milliseconds)")                       \
3831           range(PeriodicTask::min_interval, max_jint)                       \
3832           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3833                                                                             \
3834   product(bool, PerfDisableSharedMem, false,                                \
3835           "Store performance data in standard memory")                      \
3836                                                                             \
3837   product(intx, PerfDataMemorySize, 32*K,                                   \
3838           "Size of performance data memory region. Will be rounded "        \
3839           "up to a multiple of the native os page size.")                   \
3840           range(128, 32*64*K)                                               \
3841                                                                             \
3842   product(intx, PerfMaxStringConstLength, 1024,                             \
3843           "Maximum PerfStringConstant string length before truncation")     \
3844           range(32, 32*K)                                                   \
3845                                                                             \
3846   product(bool, PerfAllowAtExitRegistration, false,                         \
3847           "Allow registration of atexit() methods")                         \
3848                                                                             \
3849   product(bool, PerfBypassFileSystemCheck, false,                           \
3850           "Bypass Win32 file system criteria checks (Windows Only)")        \
3851                                                                             \
3852   product(intx, UnguardOnExecutionViolation, 0,                             \
3853           "Unguard page and retry on no-execute fault (Win32 only) "        \
3854           "0=off, 1=conservative, 2=aggressive")                            \
3855           range(0, 2)                                                       \
3856                                                                             \
3857   /* Serviceability Support */                                              \
3858                                                                             \
3859   product(bool, ManagementServer, false,                                    \
3860           "Create JMX Management Server")                                   \
3861                                                                             \
3862   product(bool, DisableAttachMechanism, false,                              \
3863           "Disable mechanism that allows tools to attach to this VM")       \
3864                                                                             \
3865   product(bool, StartAttachListener, false,                                 \
3866           "Always start Attach Listener at VM startup")                     \
3867                                                                             \
3868   product(bool, EnableDynamicAgentLoading, true,                            \
3869           "Allow tools to load agents with the attach mechanism")           \
3870                                                                             \
3871   manageable(bool, PrintConcurrentLocks, false,                             \
3872           "Print java.util.concurrent locks in thread dump")                \
3873                                                                             \
3874   product(bool, TransmitErrorReport, false,                                 \
3875           "Enable error report transmission on erroneous termination")      \
3876                                                                             \
3877   product(ccstr, ErrorReportServer, NULL,                                   \
3878           "Override built-in error report server address")                  \
3879                                                                             \
3880   /* Shared spaces */                                                       \
3881                                                                             \
3882   product(bool, UseSharedSpaces, true,                                      \
3883           "Use shared spaces for metadata")                                 \
3884                                                                             \
3885   product(bool, VerifySharedSpaces, false,                                  \
3886           "Verify shared spaces (false for default archive, true for "      \
3887           "archive specified by -XX:SharedArchiveFile)")                    \
3888                                                                             \
3889   product(bool, RequireSharedSpaces, false,                                 \
3890           "Require shared spaces for metadata")                             \
3891                                                                             \
3892   product(bool, DumpSharedSpaces, false,                                    \
3893           "Special mode: JVM reads a class list, loads classes, builds "    \
3894           "shared spaces, and dumps the shared spaces to a file to be "     \
3895           "used in future JVM runs")                                        \
3896                                                                             \
3897   product(bool, PrintSharedArchiveAndExit, false,                           \
3898           "Print shared archive file contents")                             \
3899                                                                             \
3900   product(bool, PrintSharedDictionary, false,                               \
3901           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3902           "dictionary")                                                     \
3903                                                                             \
3904   product(size_t, SharedReadWriteSize, 0,                                   \
3905           "Deprecated")                                                     \
3906                                                                             \
3907   product(size_t, SharedReadOnlySize, 0,                                    \
3908           "Deprecated")                                                     \
3909                                                                             \
3910   product(size_t, SharedMiscDataSize,  0,                                   \
3911           "Deprecated")                                                     \
3912                                                                             \
3913   product(size_t, SharedMiscCodeSize,  0,                                   \
3914           "Deprecated")                                                     \
3915                                                                             \
3916   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3917           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3918           "Address to allocate shared memory region for class data")        \
3919           range(0, SIZE_MAX)                                                \
3920                                                                             \
3921   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3922           "Average number of symbols per bucket in shared table")           \
3923           range(2, 246)                                                     \
3924                                                                             \
3925   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3926           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3927           "classes. Just exclude them from the shared dictionary.")         \
3928                                                                             \
3929   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3930           "Print generated stub code for method handles")                   \
3931                                                                             \
3932   develop(bool, TraceMethodHandles, false,                                  \
3933           "trace internal method handle operations")                        \
3934                                                                             \
3935   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3936           "perform extra checks when constructing method handles")          \
3937                                                                             \
3938   diagnostic(bool, ShowHiddenFrames, false,                                 \
3939           "show method handle implementation frames (usually hidden)")      \
3940                                                                             \
3941   experimental(bool, TrustFinalNonStaticFields, false,                      \
3942           "trust final non-static declarations for constant folding")       \
3943                                                                             \
3944   diagnostic(bool, FoldStableValues, true,                                  \
3945           "Optimize loads from stable fields (marked w/ @Stable)")          \
3946                                                                             \
3947   develop(bool, TraceInvokeDynamic, false,                                  \
3948           "trace internal invoke dynamic operations")                       \
3949                                                                             \
3950   diagnostic(bool, PauseAtStartup,      false,                              \
3951           "Causes the VM to pause at startup time and wait for the pause "  \
3952           "file to be removed (default: ./vm.paused.<pid>)")                \
3953                                                                             \
3954   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3955           "The file to create and for whose removal to await when pausing " \
3956           "at startup. (default: ./vm.paused.<pid>)")                       \
3957                                                                             \
3958   diagnostic(bool, PauseAtExit, false,                                      \
3959           "Pause and wait for keypress on exit if a debugger is attached")  \
3960                                                                             \
3961   product(bool, ExtendedDTraceProbes,    false,                             \
3962           "Enable performance-impacting dtrace probes")                     \
3963                                                                             \
3964   product(bool, DTraceMethodProbes, false,                                  \
3965           "Enable dtrace probes for method-entry and method-exit")          \
3966                                                                             \
3967   product(bool, DTraceAllocProbes, false,                                   \
3968           "Enable dtrace probes for object allocation")                     \
3969                                                                             \
3970   product(bool, DTraceMonitorProbes, false,                                 \
3971           "Enable dtrace probes for monitor events")                        \
3972                                                                             \
3973   product(bool, RelaxAccessControlCheck, false,                             \
3974           "Relax the access control checks in the verifier")                \
3975                                                                             \
3976   product(uintx, StringTableSize, defaultStringTableSize,                   \
3977           "Number of buckets in the interned String table")                 \
3978           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3979                                                                             \
3980   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3981           "Number of buckets in the JVM internal Symbol table")             \
3982           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3983                                                                             \
3984   product(bool, UseStringDeduplication, false,                              \
3985           "Use string deduplication")                                       \
3986                                                                             \
3987   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3988           "A string must reach this age (or be promoted to an old region) " \
3989           "to be considered for deduplication")                             \
3990           range(1, markOopDesc::max_age)                                    \
3991                                                                             \
3992   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3993           "Force table resize every time the table is scanned")             \
3994                                                                             \
3995   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3996           "Force table rehash every time the table is scanned")             \
3997                                                                             \
3998   diagnostic(bool, WhiteBoxAPI, false,                                      \
3999           "Enable internal testing APIs")                                   \
4000                                                                             \
4001   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4002            "Default survivor space alignment in bytes")                     \
4003            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4004                                                                             \
4005   product(bool , AllowNonVirtualCalls, false,                               \
4006           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4007                                                                             \
4008   product(ccstr, DumpLoadedClassList, NULL,                                 \
4009           "Dump the names all loaded classes, that could be stored into "   \
4010           "the CDS archive, in the specified file")                         \
4011                                                                             \
4012   product(ccstr, SharedClassListFile, NULL,                                 \
4013           "Override the default CDS class list")                            \
4014                                                                             \
4015   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4016           "Override the default location of the CDS archive file")          \
4017                                                                             \
4018   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4019           "Extra classlist for building the CDS archive file")              \
4020                                                                             \
4021   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4022           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4023           "Allocation less than this value will be allocated "              \
4024           "using malloc. Larger allocations will use mmap.")                \
4025                                                                             \
4026   experimental(bool, AlwaysAtomicAccesses, false,                           \
4027           "Accesses to all variables should always be atomic")              \
4028                                                                             \
4029   product(bool, EnableTracing, false,                                       \
4030           "Enable event-based tracing")                                     \
4031                                                                             \
4032   product(bool, UseLockedTracing, false,                                    \
4033           "Use locked-tracing when doing event-based tracing")              \
4034                                                                             \
4035   diagnostic(bool, UseUnalignedAccesses, false,                             \
4036           "Use unaligned memory accesses in Unsafe")                        \
4037                                                                             \
4038   product_pd(bool, PreserveFramePointer,                                    \
4039              "Use the FP register for holding the frame pointer "           \
4040              "and not as a general purpose register.")                      \
4041                                                                             \
4042   diagnostic(bool, CheckIntrinsics, true,                                   \
4043              "When a class C is loaded, check that "                        \
4044              "(1) all intrinsics defined by the VM for class C are present "\
4045              "in the loaded class file and are marked with the "            \
4046              "@HotSpotIntrinsicCandidate annotation, that "                 \
4047              "(2) there is an intrinsic registered for all loaded methods " \
4048              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4049              "annotation, and that "                                        \
4050              "(3) no orphan methods exist for class C (i.e., methods for "  \
4051              "which the VM declares an intrinsic but that are not declared "\
4052              "in the loaded class C. "                                      \
4053              "Check (3) is available only in debug builds.")                \
4054                                                                             \
4055   diagnostic_pd(intx, InitArrayShortSize,                                   \
4056           "Threshold small size (in bytes) for clearing arrays. "           \
4057           "Anything this size or smaller may get converted to discrete "    \
4058           "scalar stores.")                                                 \
4059           range(0, max_intx)                                                \
4060           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4061                                                                             \
4062   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4063              "Disable backwards compatibility for compile commands.")       \
4064                                                                             \
4065   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4066              "Print compiler directives on installation.")                  \
4067   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4068              "Limit on number of compiler directives.")
4069 
4070 
4071 /*
4072  *  Macros for factoring of globals
4073  */
4074 
4075 // Interface macros
4076 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4077 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4078 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4079 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4080 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4081 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4082 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4083 #ifdef PRODUCT
4084 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4085 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4086 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4087 #else
4088 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4089 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4090 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4091 #endif // PRODUCT
4092 // Special LP64 flags, product only needed for now.
4093 #ifdef _LP64
4094 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4095 #else
4096 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4097 #endif // _LP64
4098 
4099 // Implementation macros
4100 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4101 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4102 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4103 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4104 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4105 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4106 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4107 #ifdef PRODUCT
4108 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4109 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4110 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4111 #else
4112 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4113 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4114 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4115 #endif // PRODUCT
4116 #ifdef _LP64
4117 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4118 #else
4119 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4120 #endif // _LP64
4121 
4122 // Only materialize src code for range checking when required, ignore otherwise
4123 #define IGNORE_RANGE(a, b)
4124 // Only materialize src code for contraint checking when required, ignore otherwise
4125 #define IGNORE_CONSTRAINT(func,type)
4126 
4127 #define IGNORE_WRITEABLE(type)
4128 
4129 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4130               DECLARE_PD_DEVELOPER_FLAG, \
4131               DECLARE_PRODUCT_FLAG, \
4132               DECLARE_PD_PRODUCT_FLAG, \
4133               DECLARE_DIAGNOSTIC_FLAG, \
4134               DECLARE_PD_DIAGNOSTIC_FLAG, \
4135               DECLARE_EXPERIMENTAL_FLAG, \
4136               DECLARE_NOTPRODUCT_FLAG, \
4137               DECLARE_MANAGEABLE_FLAG, \
4138               DECLARE_PRODUCT_RW_FLAG, \
4139               DECLARE_LP64_PRODUCT_FLAG, \
4140               IGNORE_RANGE, \
4141               IGNORE_CONSTRAINT, \
4142               IGNORE_WRITEABLE)
4143 
4144 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4145                  DECLARE_PD_DEVELOPER_FLAG, \
4146                  DECLARE_PRODUCT_FLAG, \
4147                  DECLARE_PD_PRODUCT_FLAG, \
4148                  DECLARE_DIAGNOSTIC_FLAG, \
4149                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4150                  DECLARE_NOTPRODUCT_FLAG, \
4151                  IGNORE_RANGE, \
4152                  IGNORE_CONSTRAINT, \
4153                  IGNORE_WRITEABLE)
4154 
4155 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4156            DECLARE_PRODUCT_FLAG, \
4157            DECLARE_DIAGNOSTIC_FLAG, \
4158            DECLARE_EXPERIMENTAL_FLAG, \
4159            DECLARE_NOTPRODUCT_FLAG, \
4160            IGNORE_RANGE, \
4161            IGNORE_CONSTRAINT, \
4162            IGNORE_WRITEABLE)
4163 
4164 // Extensions
4165 
4166 #include "runtime/globals_ext.hpp"
4167 
4168 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---