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 COMPILER2_OR_JVMCI
 103 #define CI_COMPILER_COUNT 2
 104 #else
 105 #define CI_COMPILER_COUNT 1
 106 #endif // COMPILER2_OR_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   product_pd(bool, ThreadLocalHandshakes,                                   \
 602           "Use thread-local polls instead of global poll for safepoints.")  \
 603           constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo)         \
 604                                                                             \
 605   diagnostic(uint, HandshakeTimeout, 0,                                     \
 606           "If nonzero set a timeout in milliseconds for handshakes")        \
 607                                                                             \
 608   experimental(bool, AlwaysSafeConstructors, false,                         \
 609           "Force safe construction, as if all fields are final.")           \
 610                                                                             \
 611   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 612           "Enable normal processing of flags relating to field diagnostics")\
 613                                                                             \
 614   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 615           "Enable normal processing of flags relating to experimental "     \
 616           "features")                                                       \
 617                                                                             \
 618   product(bool, JavaMonitorsInStackTrace, true,                             \
 619           "Print information about Java monitor locks when the stacks are"  \
 620           "dumped")                                                         \
 621                                                                             \
 622   product_pd(bool, UseLargePages,                                           \
 623           "Use large page memory")                                          \
 624                                                                             \
 625   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 626           "Allocate large pages individually for better affinity")          \
 627                                                                             \
 628   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 629           "Fail large pages individual allocation")                         \
 630                                                                             \
 631   product(bool, UseLargePagesInMetaspace, false,                            \
 632           "Use large page memory in metaspace. "                            \
 633           "Only used if UseLargePages is enabled.")                         \
 634                                                                             \
 635   product(bool, UseNUMA, false,                                             \
 636           "Use NUMA if available")                                          \
 637                                                                             \
 638   product(bool, UseNUMAInterleaving, false,                                 \
 639           "Interleave memory across NUMA nodes if available")               \
 640                                                                             \
 641   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 642           "Granularity to use for NUMA interleaving on Windows OS")         \
 643           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 644                                                                             \
 645   product(bool, ForceNUMA, false,                                           \
 646           "Force NUMA optimizations on single-node/UMA systems")            \
 647                                                                             \
 648   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 649           "Percentage (0-100) used to weight the current sample when "      \
 650           "computing exponentially decaying average for "                   \
 651           "AdaptiveNUMAChunkSizing")                                        \
 652           range(0, 100)                                                     \
 653                                                                             \
 654   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 655           "Do not reallocate more than this amount per collection")         \
 656           range(0, max_uintx)                                               \
 657                                                                             \
 658   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 659           "Enable adaptive chunk sizing for NUMA")                          \
 660                                                                             \
 661   product(bool, NUMAStats, false,                                           \
 662           "Print NUMA stats in detailed heap information")                  \
 663                                                                             \
 664   product(uintx, NUMAPageScanRate, 256,                                     \
 665           "Maximum number of pages to include in the page scan procedure")  \
 666           range(0, max_uintx)                                               \
 667                                                                             \
 668   product_pd(bool, NeedsDeoptSuspend,                                       \
 669           "True for register window machines (sparc/ia64)")                 \
 670                                                                             \
 671   product(intx, UseSSE, 99,                                                 \
 672           "Highest supported SSE instructions set on x86/x64")              \
 673           range(0, 99)                                                      \
 674                                                                             \
 675   product(bool, UseAES, false,                                              \
 676           "Control whether AES instructions are used when available")       \
 677                                                                             \
 678   product(bool, UseFMA, false,                                              \
 679           "Control whether FMA instructions are used when available")       \
 680                                                                             \
 681   product(bool, UseSHA, false,                                              \
 682           "Control whether SHA instructions are used when available")       \
 683                                                                             \
 684   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 685           "Use intrinsics for GHASH versions of crypto")                    \
 686                                                                             \
 687   product(size_t, LargePageSizeInBytes, 0,                                  \
 688           "Large page size (0 to let VM choose the page size)")             \
 689           range(0, max_uintx)                                               \
 690                                                                             \
 691   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 692           "Use large pages if maximum heap is at least this big")           \
 693           range(0, max_uintx)                                               \
 694                                                                             \
 695   product(bool, ForceTimeHighResolution, false,                             \
 696           "Using high time resolution (for Win32 only)")                    \
 697                                                                             \
 698   develop(bool, TracePcPatching, false,                                     \
 699           "Trace usage of frame::patch_pc")                                 \
 700                                                                             \
 701   develop(bool, TraceRelocator, false,                                      \
 702           "Trace the bytecode relocator")                                   \
 703                                                                             \
 704   develop(bool, TraceLongCompiles, false,                                   \
 705           "Print out every time compilation is longer than "                \
 706           "a given threshold")                                              \
 707                                                                             \
 708   develop(bool, SafepointALot, false,                                       \
 709           "Generate a lot of safepoints. This works with "                  \
 710           "GuaranteedSafepointInterval")                                    \
 711                                                                             \
 712   product_pd(bool, BackgroundCompilation,                                   \
 713           "A thread requesting compilation is not blocked during "          \
 714           "compilation")                                                    \
 715                                                                             \
 716   product(bool, PrintVMQWaitTime, false,                                    \
 717           "Print out the waiting time in VM operation queue")               \
 718                                                                             \
 719   product(bool, MethodFlushing, true,                                       \
 720           "Reclamation of zombie and not-entrant methods")                  \
 721                                                                             \
 722   develop(bool, VerifyStack, false,                                         \
 723           "Verify stack of each thread when it is entering a runtime call") \
 724                                                                             \
 725   diagnostic(bool, ForceUnreachable, false,                                 \
 726           "Make all non code cache addresses to be unreachable by "         \
 727           "forcing use of 64bit literal fixups")                            \
 728                                                                             \
 729   notproduct(bool, StressDerivedPointers, false,                            \
 730           "Force scavenge when a derived pointer is detected on stack "     \
 731           "after rtm call")                                                 \
 732                                                                             \
 733   develop(bool, TraceDerivedPointers, false,                                \
 734           "Trace traversal of derived pointers on stack")                   \
 735                                                                             \
 736   notproduct(bool, TraceCodeBlobStacks, false,                              \
 737           "Trace stack-walk of codeblobs")                                  \
 738                                                                             \
 739   product(bool, PrintJNIResolving, false,                                   \
 740           "Used to implement -v:jni")                                       \
 741                                                                             \
 742   notproduct(bool, PrintRewrites, false,                                    \
 743           "Print methods that are being rewritten")                         \
 744                                                                             \
 745   product(bool, UseInlineCaches, true,                                      \
 746           "Use Inline Caches for virtual calls ")                           \
 747                                                                             \
 748   diagnostic(bool, InlineArrayCopy, true,                                   \
 749           "Inline arraycopy native that is known to be part of "            \
 750           "base library DLL")                                               \
 751                                                                             \
 752   diagnostic(bool, InlineObjectHash, true,                                  \
 753           "Inline Object::hashCode() native that is known to be part "      \
 754           "of base library DLL")                                            \
 755                                                                             \
 756   diagnostic(bool, InlineNatives, true,                                     \
 757           "Inline natives that are known to be part of base library DLL")   \
 758                                                                             \
 759   diagnostic(bool, InlineMathNatives, true,                                 \
 760           "Inline SinD, CosD, etc.")                                        \
 761                                                                             \
 762   diagnostic(bool, InlineClassNatives, true,                                \
 763           "Inline Class.isInstance, etc")                                   \
 764                                                                             \
 765   diagnostic(bool, InlineThreadNatives, true,                               \
 766           "Inline Thread.currentThread, etc")                               \
 767                                                                             \
 768   diagnostic(bool, InlineUnsafeOps, true,                                   \
 769           "Inline memory ops (native methods) from Unsafe")                 \
 770                                                                             \
 771   product(bool, CriticalJNINatives, true,                                   \
 772           "Check for critical JNI entry points")                            \
 773                                                                             \
 774   notproduct(bool, StressCriticalJNINatives, false,                         \
 775           "Exercise register saving code in critical natives")              \
 776                                                                             \
 777   diagnostic(bool, UseAESIntrinsics, false,                                 \
 778           "Use intrinsics for AES versions of crypto")                      \
 779                                                                             \
 780   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 781           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 782                                                                             \
 783   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 784           "Use intrinsics for SHA-1 crypto hash function. "                 \
 785           "Requires that UseSHA is enabled.")                               \
 786                                                                             \
 787   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 788           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 789           "Requires that UseSHA is enabled.")                               \
 790                                                                             \
 791   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 792           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 793           "Requires that UseSHA is enabled.")                               \
 794                                                                             \
 795   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 796           "use intrinsics for java.util.zip.CRC32")                         \
 797                                                                             \
 798   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 799           "use intrinsics for java.util.zip.CRC32C")                        \
 800                                                                             \
 801   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 802           "use intrinsics for java.util.zip.Adler32")                       \
 803                                                                             \
 804   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 805           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 806                                                                             \
 807   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 808          "do not expand intrinsics whose (internal) names appear here")     \
 809                                                                             \
 810   develop(bool, TraceCallFixup, false,                                      \
 811           "Trace all call fixups")                                          \
 812                                                                             \
 813   develop(bool, DeoptimizeALot, false,                                      \
 814           "Deoptimize at every exit from the runtime system")               \
 815                                                                             \
 816   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 817           "A comma separated list of bcis to deoptimize at")                \
 818                                                                             \
 819   product(bool, DeoptimizeRandom, false,                                    \
 820           "Deoptimize random frames on random exit from the runtime system")\
 821                                                                             \
 822   notproduct(bool, ZombieALot, false,                                       \
 823           "Create zombies (non-entrant) at exit from the runtime system")   \
 824                                                                             \
 825   product(bool, UnlinkSymbolsALot, false,                                   \
 826           "Unlink unreferenced symbols from the symbol table at safepoints")\
 827                                                                             \
 828   notproduct(bool, WalkStackALot, false,                                    \
 829           "Trace stack (no print) at every exit from the runtime system")   \
 830                                                                             \
 831   product(bool, Debugging, false,                                           \
 832           "Set when executing debug methods in debug.cpp "                  \
 833           "(to prevent triggering assertions)")                             \
 834                                                                             \
 835   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 836           "Enable strict checks that safepoints cannot happen for threads " \
 837           "that use NoSafepointVerifier")                                   \
 838                                                                             \
 839   notproduct(bool, VerifyLastFrame, false,                                  \
 840           "Verify oops on last frame on entry to VM")                       \
 841                                                                             \
 842   product(bool, FailOverToOldVerifier, true,                                \
 843           "Fail over to old verifier when split verifier fails")            \
 844                                                                             \
 845   develop(bool, ShowSafepointMsgs, false,                                   \
 846           "Show message about safepoint synchronization")                   \
 847                                                                             \
 848   product(bool, SafepointTimeout, false,                                    \
 849           "Time out and warn or fail after SafepointTimeoutDelay "          \
 850           "milliseconds if failed to reach safepoint")                      \
 851                                                                             \
 852   develop(bool, DieOnSafepointTimeout, false,                               \
 853           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 854                                                                             \
 855   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 856   /* typically, at most a few retries are needed                    */      \
 857   product(intx, SuspendRetryCount, 50,                                      \
 858           "Maximum retry count for an external suspend request")            \
 859           range(0, max_intx)                                                \
 860                                                                             \
 861   product(intx, SuspendRetryDelay, 5,                                       \
 862           "Milliseconds to delay per retry (* current_retry_count)")        \
 863           range(0, max_intx)                                                \
 864                                                                             \
 865   product(bool, AssertOnSuspendWaitFailure, false,                          \
 866           "Assert/Guarantee on external suspend wait failure")              \
 867                                                                             \
 868   product(bool, TraceSuspendWaitFailures, false,                            \
 869           "Trace external suspend wait failures")                           \
 870                                                                             \
 871   product(bool, MaxFDLimit, true,                                           \
 872           "Bump the number of file descriptors to maximum in Solaris")      \
 873                                                                             \
 874   diagnostic(bool, LogEvents, true,                                         \
 875           "Enable the various ring buffer event logs")                      \
 876                                                                             \
 877   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 878           "Number of ring buffer event logs")                               \
 879           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 880                                                                             \
 881   product(bool, BytecodeVerificationRemote, true,                           \
 882           "Enable the Java bytecode verifier for remote classes")           \
 883                                                                             \
 884   product(bool, BytecodeVerificationLocal, false,                           \
 885           "Enable the Java bytecode verifier for local classes")            \
 886                                                                             \
 887   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 888           "Force exceptions on FP stack under/overflow")                    \
 889                                                                             \
 890   develop(bool, VerifyStackAtCalls, false,                                  \
 891           "Verify that the stack pointer is unchanged after calls")         \
 892                                                                             \
 893   develop(bool, TraceJavaAssertions, false,                                 \
 894           "Trace java language assertions")                                 \
 895                                                                             \
 896   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 897           "Temporary - see javaClasses.cpp")                                \
 898                                                                             \
 899   notproduct(bool, PrintMallocFree, false,                                  \
 900           "Trace calls to C heap malloc/free allocation")                   \
 901                                                                             \
 902   notproduct(bool, VerifyCodeCache, false,                                  \
 903           "Verify code cache on memory allocation/deallocation")            \
 904                                                                             \
 905   develop(bool, UseMallocOnly, false,                                       \
 906           "Use only malloc/free for allocation (no resource area/arena)")   \
 907                                                                             \
 908   develop(bool, PrintMalloc, false,                                         \
 909           "Print all malloc/free calls")                                    \
 910                                                                             \
 911   develop(bool, PrintMallocStatistics, false,                               \
 912           "Print malloc/free statistics")                                   \
 913                                                                             \
 914   develop(bool, ZapResourceArea, trueInDebug,                               \
 915           "Zap freed resource/arena space with 0xABABABAB")                 \
 916                                                                             \
 917   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 918           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 919                                                                             \
 920   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 921           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 922                                                                             \
 923   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 924           "Zap allocated/freed stack segments with 0xFADFADED")             \
 925                                                                             \
 926   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 927           "Zap unused heap space with 0xBAADBABE")                          \
 928                                                                             \
 929   develop(bool, CheckZapUnusedHeapArea, false,                              \
 930           "Check zapping of unused heap space")                             \
 931                                                                             \
 932   develop(bool, ZapFillerObjects, trueInDebug,                              \
 933           "Zap filler objects with 0xDEAFBABE")                             \
 934                                                                             \
 935   develop(bool, PrintVMMessages, true,                                      \
 936           "Print VM messages on console")                                   \
 937                                                                             \
 938   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 939           "If > 0, provokes an error after VM initialization; the value "   \
 940           "determines which error to provoke. See test_error_handler() "    \
 941           "in vmError.cpp.")                                                \
 942                                                                             \
 943   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 944           "If > 0, provokes an error inside VM error handler (a secondary " \
 945           "crash). see test_error_handler() in vmError.cpp")                \
 946                                                                             \
 947   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 948           "If true, tests SafeFetch inside error handler.")                 \
 949                                                                             \
 950   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 951           "If true, simulates an unresponsive error handler.")              \
 952                                                                             \
 953   develop(bool, Verbose, false,                                             \
 954           "Print additional debugging information from other modes")        \
 955                                                                             \
 956   develop(bool, PrintMiscellaneous, false,                                  \
 957           "Print uncategorized debugging information (requires +Verbose)")  \
 958                                                                             \
 959   develop(bool, WizardMode, false,                                          \
 960           "Print much more debugging information")                          \
 961                                                                             \
 962   product(bool, ShowMessageBoxOnError, false,                               \
 963           "Keep process alive on VM fatal error")                           \
 964                                                                             \
 965   product(bool, CreateCoredumpOnCrash, true,                                \
 966           "Create core/mini dump on VM fatal error")                        \
 967                                                                             \
 968   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 969           "Timeout, in seconds, to limit the time spent on writing an "     \
 970           "error log in case of a crash.")                                  \
 971           range(0, (uint64_t)max_jlong/1000)                                \
 972                                                                             \
 973   product_pd(bool, UseOSErrorReporting,                                     \
 974           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 975                                                                             \
 976   product(bool, SuppressFatalErrorMessage, false,                           \
 977           "Report NO fatal error message (avoid deadlock)")                 \
 978                                                                             \
 979   product(ccstrlist, OnError, "",                                           \
 980           "Run user-defined commands on fatal error; see VMError.cpp "      \
 981           "for examples")                                                   \
 982                                                                             \
 983   product(ccstrlist, OnOutOfMemoryError, "",                                \
 984           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 985                                                                             \
 986   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 987           "Dump heap to file before any major stop-the-world GC")           \
 988                                                                             \
 989   manageable(bool, HeapDumpAfterFullGC, false,                              \
 990           "Dump heap to file after any major stop-the-world GC")            \
 991                                                                             \
 992   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 993           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 994                                                                             \
 995   manageable(ccstr, HeapDumpPath, NULL,                                     \
 996           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 997           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 998           "in the working directory)")                                      \
 999                                                                             \
1000   develop(bool, BreakAtWarning, false,                                      \
1001           "Execute breakpoint upon encountering VM warning")                \
1002                                                                             \
1003   develop(bool, UseFakeTimers, false,                                       \
1004           "Tell whether the VM should use system time or a fake timer")     \
1005                                                                             \
1006   product(ccstr, NativeMemoryTracking, "off",                               \
1007           "Native memory tracking options")                                 \
1008                                                                             \
1009   diagnostic(bool, PrintNMTStatistics, false,                               \
1010           "Print native memory tracking summary data if it is on")          \
1011                                                                             \
1012   diagnostic(bool, LogCompilation, false,                                   \
1013           "Log compilation activity in detail to LogFile")                  \
1014                                                                             \
1015   product(bool, PrintCompilation, false,                                    \
1016           "Print compilations")                                             \
1017                                                                             \
1018   diagnostic(bool, TraceNMethodInstalls, false,                             \
1019           "Trace nmethod installation")                                     \
1020                                                                             \
1021   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1022           "0: do not allow scavengable oops in the code cache; "            \
1023           "1: allow scavenging from the code cache; "                       \
1024           "2: emit as many constants as the compiler can see")              \
1025           range(0, 2)                                                       \
1026                                                                             \
1027   product(bool, AlwaysRestoreFPU, false,                                    \
1028           "Restore the FPU control word after every JNI call (expensive)")  \
1029                                                                             \
1030   diagnostic(bool, PrintCompilation2, false,                                \
1031           "Print additional statistics per compilation")                    \
1032                                                                             \
1033   diagnostic(bool, PrintAdapterHandlers, false,                             \
1034           "Print code generated for i2c/c2i adapters")                      \
1035                                                                             \
1036   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1037           "Verify that i2c/c2i adapters are called properly")               \
1038                                                                             \
1039   develop(bool, VerifyAdapterSharing, false,                                \
1040           "Verify that the code for shared adapters is the equivalent")     \
1041                                                                             \
1042   diagnostic(bool, PrintAssembly, false,                                    \
1043           "Print assembly code (using external disassembler.so)")           \
1044                                                                             \
1045   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1046           "Print options string passed to disassembler.so")                 \
1047                                                                             \
1048   notproduct(bool, PrintNMethodStatistics, false,                           \
1049           "Print a summary statistic for the generated nmethods")           \
1050                                                                             \
1051   diagnostic(bool, PrintNMethods, false,                                    \
1052           "Print assembly code for nmethods when generated")                \
1053                                                                             \
1054   diagnostic(bool, PrintNativeNMethods, false,                              \
1055           "Print assembly code for native nmethods when generated")         \
1056                                                                             \
1057   develop(bool, PrintDebugInfo, false,                                      \
1058           "Print debug information for all nmethods when generated")        \
1059                                                                             \
1060   develop(bool, PrintRelocations, false,                                    \
1061           "Print relocation information for all nmethods when generated")   \
1062                                                                             \
1063   develop(bool, PrintDependencies, false,                                   \
1064           "Print dependency information for all nmethods when generated")   \
1065                                                                             \
1066   develop(bool, PrintExceptionHandlers, false,                              \
1067           "Print exception handler tables for all nmethods when generated") \
1068                                                                             \
1069   develop(bool, StressCompiledExceptionHandlers, false,                     \
1070           "Exercise compiled exception handlers")                           \
1071                                                                             \
1072   develop(bool, InterceptOSException, false,                                \
1073           "Start debugger when an implicit OS (e.g. NULL) "                 \
1074           "exception happens")                                              \
1075                                                                             \
1076   product(bool, PrintCodeCache, false,                                      \
1077           "Print the code cache memory usage when exiting")                 \
1078                                                                             \
1079   develop(bool, PrintCodeCache2, false,                                     \
1080           "Print detailed usage information on the code cache when exiting")\
1081                                                                             \
1082   product(bool, PrintCodeCacheOnCompilation, false,                         \
1083           "Print the code cache memory usage each time a method is "        \
1084           "compiled")                                                       \
1085                                                                             \
1086   diagnostic(bool, PrintStubCode, false,                                    \
1087           "Print generated stub code")                                      \
1088                                                                             \
1089   product(bool, StackTraceInThrowable, true,                                \
1090           "Collect backtrace in throwable when exception happens")          \
1091                                                                             \
1092   product(bool, OmitStackTraceInFastThrow, true,                            \
1093           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1094                                                                             \
1095   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1096           "Print bytecode statistics when dumping profiler output")         \
1097                                                                             \
1098   product(bool, ProfilerRecordPC, false,                                    \
1099           "Collect ticks for each 16 byte interval of compiled code")       \
1100                                                                             \
1101   product(bool, ProfileVM, false,                                           \
1102           "Profile ticks that fall within VM (either in the VM Thread "     \
1103           "or VM code called through stubs)")                               \
1104                                                                             \
1105   product(bool, ProfileIntervals, false,                                    \
1106           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1107                                                                             \
1108   notproduct(bool, ProfilerCheckIntervals, false,                           \
1109           "Collect and print information on spacing of profiler ticks")     \
1110                                                                             \
1111   product(bool, PrintWarnings, true,                                        \
1112           "Print JVM warnings to output stream")                            \
1113                                                                             \
1114   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1115           "Print warnings for stalled SpinLocks")                           \
1116                                                                             \
1117   product(bool, RegisterFinalizersAtInit, true,                             \
1118           "Register finalizable objects at end of Object.<init> or "        \
1119           "after allocation")                                               \
1120                                                                             \
1121   develop(bool, RegisterReferences, true,                                   \
1122           "Tell whether the VM should register soft/weak/final/phantom "    \
1123           "references")                                                     \
1124                                                                             \
1125   develop(bool, IgnoreRewrites, false,                                      \
1126           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1127           "This is unsafe!")                                                \
1128                                                                             \
1129   develop(bool, PrintCodeCacheExtension, false,                             \
1130           "Print extension of code cache")                                  \
1131                                                                             \
1132   develop(bool, UsePrivilegedStack, true,                                   \
1133           "Enable the security JVM functions")                              \
1134                                                                             \
1135   develop(bool, ProtectionDomainVerification, true,                         \
1136           "Verify protection domain before resolution in system dictionary")\
1137                                                                             \
1138   product(bool, ClassUnloading, true,                                       \
1139           "Do unloading of classes")                                        \
1140                                                                             \
1141   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1142           "Do unloading of classes with a concurrent marking cycle")        \
1143                                                                             \
1144   develop(bool, DisableStartThread, false,                                  \
1145           "Disable starting of additional Java threads "                    \
1146           "(for debugging only)")                                           \
1147                                                                             \
1148   develop(bool, MemProfiling, false,                                        \
1149           "Write memory usage profiling to log file")                       \
1150                                                                             \
1151   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1152           "Print the system dictionary at exit")                            \
1153                                                                             \
1154   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
1155           "Dynamically resize system dictionaries as needed")               \
1156                                                                             \
1157   diagnostic(bool, UnsyncloadClass, false,                                  \
1158           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1159           "class loader must call VM synchronized for findClass "           \
1160           "and defineClass.")                                               \
1161                                                                             \
1162   product(bool, AlwaysLockClassLoader, false,                               \
1163           "Require the VM to acquire the class loader lock before calling " \
1164           "loadClass() even for class loaders registering "                 \
1165           "as parallel capable")                                            \
1166                                                                             \
1167   product(bool, AllowParallelDefineClass, false,                            \
1168           "Allow parallel defineClass requests for class loaders "          \
1169           "registering as parallel capable")                                \
1170                                                                             \
1171   product(bool, MustCallLoadClassInternal, false,                           \
1172           "Call loadClassInternal() rather than loadClass()")               \
1173                                                                             \
1174   product_pd(bool, DontYieldALot,                                           \
1175           "Throw away obvious excess yield calls")                          \
1176                                                                             \
1177   develop(bool, UseDetachedThreads, true,                                   \
1178           "Use detached threads that are recycled upon termination "        \
1179           "(for Solaris only)")                                             \
1180                                                                             \
1181   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
1182                "Disable the use of stack guard pages if the JVM is loaded " \
1183                "on the primordial process thread")                          \
1184                                                                             \
1185   product(bool, UseLWPSynchronization, true,                                \
1186           "Use LWP-based instead of libthread-based synchronization "       \
1187           "(SPARC only)")                                                   \
1188                                                                             \
1189   experimental(ccstr, SyncKnobs, NULL,                                      \
1190                "(Unstable) Various monitor synchronization tunables")       \
1191                                                                             \
1192   experimental(intx, EmitSync, 0,                                           \
1193                "(Unsafe, Unstable) "                                        \
1194                "Control emission of inline sync fast-path code")            \
1195                                                                             \
1196   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1197           range(0, max_jint)                                                \
1198                                                                             \
1199   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1200                                                                             \
1201   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1202                 "Percentage of used monitors before triggering cleanup "    \
1203                 "safepoint which deflates monitors (0 is off). "            \
1204                 "The check is performed on GuaranteedSafepointInterval.")   \
1205                 range(0, 100)                                               \
1206                                                                             \
1207   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1208                "Experimental Sync flags")                                   \
1209                                                                             \
1210   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1211                                                                             \
1212   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1213                                                                             \
1214   experimental(intx, hashCode, 5,                                           \
1215                "(Unstable) select hashCode generation algorithm")           \
1216                                                                             \
1217   product(bool, FilterSpuriousWakeups, true,                                \
1218           "When true prevents OS-level spurious, or premature, wakeups "    \
1219           "from Object.wait (Ignored for Windows)")                         \
1220                                                                             \
1221   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1222                                                                             \
1223   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1224                                                                             \
1225   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1226                                                                             \
1227   develop(bool, UsePthreads, false,                                         \
1228           "Use pthread-based instead of libthread-based synchronization "   \
1229           "(SPARC only)")                                                   \
1230                                                                             \
1231   product(bool, ReduceSignalUsage, false,                                   \
1232           "Reduce the use of OS signals in Java and/or the VM")             \
1233                                                                             \
1234   develop_pd(bool, ShareVtableStubs,                                        \
1235           "Share vtable stubs (smaller code but worse branch prediction")   \
1236                                                                             \
1237   develop(bool, LoadLineNumberTables, true,                                 \
1238           "Tell whether the class file parser loads line number tables")    \
1239                                                                             \
1240   develop(bool, LoadLocalVariableTables, true,                              \
1241           "Tell whether the class file parser loads local variable tables") \
1242                                                                             \
1243   develop(bool, LoadLocalVariableTypeTables, true,                          \
1244           "Tell whether the class file parser loads local variable type"    \
1245           "tables")                                                         \
1246                                                                             \
1247   product(bool, AllowUserSignalHandlers, false,                             \
1248           "Do not complain if the application installs signal handlers "    \
1249           "(Solaris & Linux only)")                                         \
1250                                                                             \
1251   product(bool, UseSignalChaining, true,                                    \
1252           "Use signal-chaining to invoke signal handlers installed "        \
1253           "by the application (Solaris & Linux only)")                      \
1254                                                                             \
1255   product(bool, AllowJNIEnvProxy, false,                                    \
1256           "Allow JNIEnv proxies for jdbx")                                  \
1257                                                                             \
1258   product(bool, RestoreMXCSROnJNICalls, false,                              \
1259           "Restore MXCSR when returning from JNI calls")                    \
1260                                                                             \
1261   product(bool, CheckJNICalls, false,                                       \
1262           "Verify all arguments to JNI calls")                              \
1263                                                                             \
1264   product(bool, CheckEndorsedAndExtDirs, false,                             \
1265           "Verify the endorsed and extension directories are not used")     \
1266                                                                             \
1267   product(bool, UseFastJNIAccessors, true,                                  \
1268           "Use optimized versions of Get<Primitive>Field")                  \
1269                                                                             \
1270   product(intx, MaxJNILocalCapacity, 65536,                                 \
1271           "Maximum allowable local JNI handle capacity to "                 \
1272           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1273           "where <= 0 is unlimited, default: 65536")                        \
1274           range(min_intx, max_intx)                                         \
1275                                                                             \
1276   product(bool, EagerXrunInit, false,                                       \
1277           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1278           "but not all -Xrun libraries may support the state of the VM "    \
1279           "at this time")                                                   \
1280                                                                             \
1281   product(bool, PreserveAllAnnotations, false,                              \
1282           "Preserve RuntimeInvisibleAnnotations as well "                   \
1283           "as RuntimeVisibleAnnotations")                                   \
1284                                                                             \
1285   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1286           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1287                                                                             \
1288   product(bool, UseXMMForArrayCopy, false,                                  \
1289           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1290                                                                             \
1291   product(intx, FieldsAllocationStyle, 1,                                   \
1292           "0 - type based with oops first, "                                \
1293           "1 - with oops last, "                                            \
1294           "2 - oops in super and sub classes are together")                 \
1295           range(0, 2)                                                       \
1296                                                                             \
1297   product(bool, CompactFields, true,                                        \
1298           "Allocate nonstatic fields in gaps between previous fields")      \
1299                                                                             \
1300   notproduct(bool, PrintFieldLayout, false,                                 \
1301           "Print field layout for each class")                              \
1302                                                                             \
1303   notproduct(bool, PrintValueLayout, false,                                 \
1304           "Print field layout for each value type")                         \
1305                                                                             \
1306   notproduct(bool, PrintValueArrayLayout, false,                            \
1307           "Print array layout for each value type array")                   \
1308                                                                             \
1309   product(bool, ValueArrayFlatten, true,                                    \
1310           "Flatten value array elements, if possible")                      \
1311                                                                             \
1312   product(intx, ValueArrayElemMaxFlatSize, -1,                              \
1313           "Max size for flattening value array elements, <0 no limit")      \
1314                                                                             \
1315   product(intx, ValueFieldMaxFlatSize, -1,                                  \
1316           "Max size for flattening value type fields, <0 no limit")         \
1317                                                                             \
1318   product(intx, ValueArrayElemMaxFlatOops, 4,                               \
1319           "Max nof embedded object references in a value type to flatten, <0 no limit")  \
1320                                                                             \
1321   product(bool, ValueArrayAtomicAccess, false,                              \
1322           "Atomic value array accesses by-default, for all value arrays")   \
1323                                                                             \
1324   /* Need to limit the extent of the padding to reasonable size.          */\
1325   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1326   /* aggressive prefetching, while still leaving the room for segregating */\
1327   /* among the distinct pages.                                            */\
1328   product(intx, ContendedPaddingWidth, 128,                                 \
1329           "How many bytes to pad the fields/classes marked @Contended with")\
1330           range(0, 8192)                                                    \
1331           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1332                                                                             \
1333   product(bool, EnableContended, true,                                      \
1334           "Enable @Contended annotation support")                           \
1335                                                                             \
1336   product(bool, RestrictContended, true,                                    \
1337           "Restrict @Contended to trusted classes")                         \
1338                                                                             \
1339   product(bool, UseBiasedLocking, true,                                     \
1340           "Enable biased locking in JVM")                                   \
1341                                                                             \
1342   product(intx, BiasedLockingStartupDelay, 0,                               \
1343           "Number of milliseconds to wait before enabling biased locking")  \
1344           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1345           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1346                                                                             \
1347   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1348           "Print statistics of biased locking in JVM")                      \
1349                                                                             \
1350   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1351           "Threshold of number of revocations per type to try to "          \
1352           "rebias all objects in the heap of that type")                    \
1353           range(0, max_intx)                                                \
1354           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1355                                                                             \
1356   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1357           "Threshold of number of revocations per type to permanently "     \
1358           "revoke biases of all objects in the heap of that type")          \
1359           range(0, max_intx)                                                \
1360           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1361                                                                             \
1362   product(intx, BiasedLockingDecayTime, 25000,                              \
1363           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1364           "type after previous bulk rebias")                                \
1365           range(500, max_intx)                                              \
1366           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1367                                                                             \
1368   product(bool, ExitOnOutOfMemoryError, false,                              \
1369           "JVM exits on the first occurrence of an out-of-memory error")    \
1370                                                                             \
1371   product(bool, CrashOnOutOfMemoryError, false,                             \
1372           "JVM aborts, producing an error log and core/mini dump, on the "  \
1373           "first occurrence of an out-of-memory error")                     \
1374                                                                             \
1375   /* tracing */                                                             \
1376                                                                             \
1377   develop(bool, StressRewriter, false,                                      \
1378           "Stress linktime bytecode rewriting")                             \
1379                                                                             \
1380   product(ccstr, TraceJVMTI, NULL,                                          \
1381           "Trace flags for JVMTI functions and events")                     \
1382                                                                             \
1383   /* This option can change an EMCP method into an obsolete method. */      \
1384   /* This can affect tests that except specific methods to be EMCP. */      \
1385   /* This option should be used with caution.                       */      \
1386   product(bool, StressLdcRewrite, false,                                    \
1387           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1388                                                                             \
1389   /* change to false by default sometime after Mustang */                   \
1390   product(bool, VerifyMergedCPBytecodes, true,                              \
1391           "Verify bytecodes after RedefineClasses constant pool merging")   \
1392                                                                             \
1393   develop(bool, TraceBytecodes, false,                                      \
1394           "Trace bytecode execution")                                       \
1395                                                                             \
1396   develop(bool, TraceICs, false,                                            \
1397           "Trace inline cache changes")                                     \
1398                                                                             \
1399   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1400           "Trace method invocation counter overflow")                       \
1401                                                                             \
1402   develop(bool, TraceInlineCacheClearing, false,                            \
1403           "Trace clearing of inline caches in nmethods")                    \
1404                                                                             \
1405   develop(bool, TraceDependencies, false,                                   \
1406           "Trace dependencies")                                             \
1407                                                                             \
1408   develop(bool, VerifyDependencies, trueInDebug,                            \
1409           "Exercise and verify the compilation dependency mechanism")       \
1410                                                                             \
1411   develop(bool, TraceNewOopMapGeneration, false,                            \
1412           "Trace OopMapGeneration")                                         \
1413                                                                             \
1414   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1415           "Trace OopMapGeneration: print detailed cell states")             \
1416                                                                             \
1417   develop(bool, TimeOopMap, false,                                          \
1418           "Time calls to GenerateOopMap::compute_map() in sum")             \
1419                                                                             \
1420   develop(bool, TimeOopMap2, false,                                         \
1421           "Time calls to GenerateOopMap::compute_map() individually")       \
1422                                                                             \
1423   develop(bool, TraceOopMapRewrites, false,                                 \
1424           "Trace rewriting of method oops during oop map generation")       \
1425                                                                             \
1426   develop(bool, TraceICBuffer, false,                                       \
1427           "Trace usage of IC buffer")                                       \
1428                                                                             \
1429   develop(bool, TraceCompiledIC, false,                                     \
1430           "Trace changes of compiled IC")                                   \
1431                                                                             \
1432   /* gc */                                                                  \
1433                                                                             \
1434   product(bool, UseSerialGC, false,                                         \
1435           "Use the Serial garbage collector")                               \
1436                                                                             \
1437   product(bool, UseG1GC, false,                                             \
1438           "Use the Garbage-First garbage collector")                        \
1439                                                                             \
1440   product(bool, UseParallelGC, false,                                       \
1441           "Use the Parallel Scavenge garbage collector")                    \
1442                                                                             \
1443   product(bool, UseParallelOldGC, false,                                    \
1444           "Use the Parallel Old garbage collector")                         \
1445                                                                             \
1446   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1447           "How often should we maximally compact the heap (not allowing "   \
1448           "any dead space)")                                                \
1449           range(0, max_uintx)                                               \
1450                                                                             \
1451   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1452           "The collection count for the first maximum compaction")          \
1453           range(0, max_uintx)                                               \
1454                                                                             \
1455   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1456           "Use maximum compaction in the Parallel Old garbage collector "   \
1457           "for a system GC")                                                \
1458                                                                             \
1459   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1460           "The mean used by the parallel compact dead wood "                \
1461           "limiter (a number between 0-100)")                               \
1462           range(0, 100)                                                     \
1463                                                                             \
1464   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1465           "The standard deviation used by the parallel compact dead wood "  \
1466           "limiter (a number between 0-100)")                               \
1467           range(0, 100)                                                     \
1468                                                                             \
1469   product(uint, ParallelGCThreads, 0,                                       \
1470           "Number of parallel threads parallel gc will use")                \
1471           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1472                                                                             \
1473   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1474             "Use semaphore synchronization for the GC Threads, "            \
1475             "instead of synchronization based on mutexes")                  \
1476                                                                             \
1477   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1478           "Dynamically choose the number of parallel threads "              \
1479           "parallel gc will use")                                           \
1480                                                                             \
1481   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1482              "Inject thread creation failures for "                         \
1483              "UseDynamicNumberOfGCThreads")                                 \
1484                                                                             \
1485   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1486           "Force dynamic selection of the number of "                       \
1487           "parallel threads parallel gc will use to aid debugging")         \
1488                                                                             \
1489   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1490           "Size of heap (bytes) per GC thread used in calculating the "     \
1491           "number of GC threads")                                           \
1492           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1493                                                                             \
1494   product(uint, ConcGCThreads, 0,                                           \
1495           "Number of threads concurrent gc will use")                       \
1496           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1497                                                                             \
1498   product(uint, GCTaskTimeStampEntries, 200,                                \
1499           "Number of time stamp entries per gc worker thread")              \
1500           range(1, max_jint)                                                \
1501                                                                             \
1502   product(bool, AlwaysTenure, false,                                        \
1503           "Always tenure objects in eden (ParallelGC only)")                \
1504                                                                             \
1505   product(bool, NeverTenure, false,                                         \
1506           "Never tenure objects in eden, may tenure on overflow "           \
1507           "(ParallelGC only)")                                              \
1508                                                                             \
1509   product(bool, ScavengeBeforeFullGC, true,                                 \
1510           "Scavenge youngest generation before each full GC.")              \
1511                                                                             \
1512   product(bool, UseConcMarkSweepGC, false,                                  \
1513           "Use Concurrent Mark-Sweep GC in the old generation")             \
1514                                                                             \
1515   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1516           "A System.gc() request invokes a concurrent collection; "         \
1517           "(effective only when using concurrent collectors)")              \
1518                                                                             \
1519   product(bool, GCLockerInvokesConcurrent, false,                           \
1520           "The exit of a JNI critical section necessitating a scavenge, "   \
1521           "also kicks off a background concurrent collection")              \
1522                                                                             \
1523   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1524           "How much the GC can expand the eden by while the GC locker "     \
1525           "is active (as a percentage)")                                    \
1526           range(0, 100)                                                     \
1527                                                                             \
1528   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1529           "Number of times to retry allocations when "                      \
1530           "blocked by the GC locker")                                       \
1531           range(0, max_uintx)                                               \
1532                                                                             \
1533   product(bool, UseCMSBestFit, true,                                        \
1534           "Use CMS best fit allocation strategy")                           \
1535                                                                             \
1536   product(uintx, ParallelGCBufferWastePct, 10,                              \
1537           "Wasted fraction of parallel allocation buffer")                  \
1538           range(0, 100)                                                     \
1539                                                                             \
1540   product(uintx, TargetPLABWastePct, 10,                                    \
1541           "Target wasted space in last buffer as percent of overall "       \
1542           "allocation")                                                     \
1543           range(1, 100)                                                     \
1544                                                                             \
1545   product(uintx, PLABWeight, 75,                                            \
1546           "Percentage (0-100) used to weight the current sample when "      \
1547           "computing exponentially decaying average for ResizePLAB")        \
1548           range(0, 100)                                                     \
1549                                                                             \
1550   product(bool, ResizePLAB, true,                                           \
1551           "Dynamically resize (survivor space) promotion LAB's")            \
1552                                                                             \
1553   product(int, ParGCArrayScanChunk, 50,                                     \
1554           "Scan a subset of object array and push remainder, if array is "  \
1555           "bigger than this")                                               \
1556           range(1, max_jint/3)                                              \
1557                                                                             \
1558   product(bool, ParGCUseLocalOverflow, false,                               \
1559           "Instead of a global overflow list, use local overflow stacks")   \
1560                                                                             \
1561   product(bool, ParGCTrimOverflow, true,                                    \
1562           "Eagerly trim the local overflow lists "                          \
1563           "(when ParGCUseLocalOverflow)")                                   \
1564                                                                             \
1565   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1566           "Simulate work queue overflow in ParNew")                         \
1567                                                                             \
1568   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1569           "An `interval' counter that determines how frequently "           \
1570           "we simulate overflow; a smaller number increases frequency")     \
1571                                                                             \
1572   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1573           "The desired number of objects to claim from the overflow list")  \
1574           range(0, max_uintx)                                               \
1575                                                                             \
1576   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1577           "The number of strides per worker thread that we divide up the "  \
1578           "card table scanning work into")                                  \
1579           range(1, max_uintx)                                               \
1580           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1581                                                                             \
1582   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1583           "The number of cards in each chunk of the parallel chunks used "  \
1584           "during card table scanning")                                     \
1585           range(1, max_intx)                                                \
1586           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1587                                                                             \
1588   product(uintx, OldPLABWeight, 50,                                         \
1589           "Percentage (0-100) used to weight the current sample when "      \
1590           "computing exponentially decaying average for resizing "          \
1591           "OldPLABSize")                                                    \
1592           range(0, 100)                                                     \
1593                                                                             \
1594   product(bool, ResizeOldPLAB, true,                                        \
1595           "Dynamically resize (old gen) promotion LAB's")                   \
1596                                                                             \
1597   product(size_t, CMSOldPLABMax, 1024,                                      \
1598           "Maximum size of CMS gen promotion LAB caches per worker "        \
1599           "per block size")                                                 \
1600           range(1, max_uintx)                                               \
1601           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1602                                                                             \
1603   product(size_t, CMSOldPLABMin, 16,                                        \
1604           "Minimum size of CMS gen promotion LAB caches per worker "        \
1605           "per block size")                                                 \
1606           range(1, max_uintx)                                               \
1607           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1608                                                                             \
1609   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1610           "Nominal number of refills of CMS gen promotion LAB cache "       \
1611           "per worker per block size")                                      \
1612           range(1, max_uintx)                                               \
1613                                                                             \
1614   product(bool, CMSOldPLABResizeQuicker, false,                             \
1615           "React on-the-fly during a scavenge to a sudden "                 \
1616           "change in block demand rate")                                    \
1617                                                                             \
1618   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1619           "The tolerance of the phase-change detector for on-the-fly "      \
1620           "PLAB resizing during a scavenge")                                \
1621           range(1, max_uintx)                                               \
1622                                                                             \
1623   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1624           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1625           "during a scavenge")                                              \
1626           range(1, max_uintx)                                               \
1627                                                                             \
1628   product(bool, AlwaysPreTouch, false,                                      \
1629           "Force all freshly committed pages to be pre-touched")            \
1630                                                                             \
1631   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1632           "Per-thread chunk size for parallel memory pre-touch.")           \
1633           range(1, SIZE_MAX / 2)                                            \
1634                                                                             \
1635   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1636           "The maximum size of young gen chosen by default per GC worker "  \
1637           "thread available")                                               \
1638           range(1, max_uintx)                                               \
1639                                                                             \
1640   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1641           "Percentage (0-100) used to add conservatism when computing the " \
1642           "duty cycle")                                                     \
1643           range(0, 100)                                                     \
1644                                                                             \
1645   product(uintx, CMSExpAvgFactor, 50,                                       \
1646           "Percentage (0-100) used to weight the current sample when "      \
1647           "computing exponential averages for CMS statistics")              \
1648           range(0, 100)                                                     \
1649                                                                             \
1650   product(uintx, CMS_FLSWeight, 75,                                         \
1651           "Percentage (0-100) used to weight the current sample when "      \
1652           "computing exponentially decaying averages for CMS FLS "          \
1653           "statistics")                                                     \
1654           range(0, 100)                                                     \
1655                                                                             \
1656   product(uintx, CMS_FLSPadding, 1,                                         \
1657           "The multiple of deviation from mean to use for buffering "       \
1658           "against volatility in free list demand")                         \
1659           range(0, max_juint)                                               \
1660                                                                             \
1661   product(uintx, FLSCoalescePolicy, 2,                                      \
1662           "CMS: aggressiveness level for coalescing, increasing "           \
1663           "from 0 to 4")                                                    \
1664           range(0, 4)                                                       \
1665                                                                             \
1666   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1667           "CMS: larger free blocks are always available for coalescing")    \
1668                                                                             \
1669   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1670           "CMS: the smaller the percentage the greater the coalescing "     \
1671           "force")                                                          \
1672           range(0.0, 1.0)                                                   \
1673                                                                             \
1674   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1675           "CMS: the factor by which to inflate estimated demand of small "  \
1676           "block sizes to prevent coalescing with an adjoining block")      \
1677           range(0.0, DBL_MAX)                                               \
1678                                                                             \
1679   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1680           "CMS: the factor by which to inflate estimated demand of large "  \
1681           "block sizes to prevent coalescing with an adjoining block")      \
1682           range(0.0, DBL_MAX)                                               \
1683                                                                             \
1684   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1685           "CMS: the factor by which to inflate estimated demand of small "  \
1686           "block sizes to prevent splitting to supply demand for smaller "  \
1687           "blocks")                                                         \
1688           range(0.0, DBL_MAX)                                               \
1689                                                                             \
1690   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1691           "CMS: the factor by which to inflate estimated demand of large "  \
1692           "block sizes to prevent splitting to supply demand for smaller "  \
1693           "blocks")                                                         \
1694           range(0.0, DBL_MAX)                                               \
1695                                                                             \
1696   product(bool, CMSExtrapolateSweep, false,                                 \
1697           "CMS: cushion for block demand during sweep")                     \
1698                                                                             \
1699   product(uintx, CMS_SweepWeight, 75,                                       \
1700           "Percentage (0-100) used to weight the current sample when "      \
1701           "computing exponentially decaying average for inter-sweep "       \
1702           "duration")                                                       \
1703           range(0, 100)                                                     \
1704                                                                             \
1705   product(uintx, CMS_SweepPadding, 1,                                       \
1706           "The multiple of deviation from mean to use for buffering "       \
1707           "against volatility in inter-sweep duration")                     \
1708           range(0, max_juint)                                               \
1709                                                                             \
1710   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1711           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1712           "duration exceeds this threshold in milliseconds")                \
1713           range(0, max_uintx)                                               \
1714                                                                             \
1715   product(bool, CMSClassUnloadingEnabled, true,                             \
1716           "Whether class unloading enabled when using CMS GC")              \
1717                                                                             \
1718   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1719           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1720           "count for which classes may not be unloaded")                    \
1721           range(0, max_uintx)                                               \
1722                                                                             \
1723   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1724           "Replenish an indexed free list with this number of chunks")      \
1725           range(1, max_uintx)                                               \
1726                                                                             \
1727   product(bool, CMSReplenishIntermediate, true,                             \
1728           "Replenish all intermediate free-list caches")                    \
1729                                                                             \
1730   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1731           "When satisfying batched demand, split blocks from the "          \
1732           "IndexedFreeList whose size is a multiple of requested size")     \
1733                                                                             \
1734   product(bool, CMSLoopWarn, false,                                         \
1735           "Warn in case of excessive CMS looping")                          \
1736                                                                             \
1737   /* where does the range max value of (max_jint - 1) come from? */         \
1738   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1739           "Maximum size of marking stack")                                  \
1740           range(1, (max_jint - 1))                                          \
1741                                                                             \
1742   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1743           "Size of marking stack")                                          \
1744           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1745                                                                             \
1746   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1747           "Simulate frequent marking stack / work queue overflow")          \
1748                                                                             \
1749   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1750           "An \"interval\" counter that determines how frequently "         \
1751           "to simulate overflow; a smaller number increases frequency")     \
1752                                                                             \
1753   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1754           "Maximum number of abortable preclean iterations, if > 0")        \
1755           range(0, max_uintx)                                               \
1756                                                                             \
1757   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1758           "Maximum time in abortable preclean (in milliseconds)")           \
1759           range(0, max_intx)                                                \
1760                                                                             \
1761   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1762           "Nominal minimum work per abortable preclean iteration")          \
1763           range(0, max_uintx)                                               \
1764                                                                             \
1765   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1766           "Time that we sleep between iterations when not given "           \
1767           "enough work per iteration")                                      \
1768           range(0, max_intx)                                                \
1769                                                                             \
1770   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1771   product(size_t, CMSRescanMultiple, 32,                                    \
1772           "Size (in cards) of CMS parallel rescan task")                    \
1773           range(1, SIZE_MAX / 4096)                                         \
1774           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1775                                                                             \
1776   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1777   product(size_t, CMSConcMarkMultiple, 32,                                  \
1778           "Size (in cards) of CMS concurrent MT marking task")              \
1779           range(1, SIZE_MAX / 4096)                                         \
1780           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1781                                                                             \
1782   product(bool, CMSAbortSemantics, false,                                   \
1783           "Whether abort-on-overflow semantics is implemented")             \
1784                                                                             \
1785   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1786           "Use the parallel initial mark.")                                 \
1787                                                                             \
1788   product(bool, CMSParallelRemarkEnabled, true,                             \
1789           "Whether parallel remark enabled (only if ParNewGC)")             \
1790                                                                             \
1791   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1792           "Whether parallel remark of survivor space "                      \
1793           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1794                                                                             \
1795   product(bool, CMSPLABRecordAlways, true,                                  \
1796           "Always record survivor space PLAB boundaries (effective only "   \
1797           "if CMSParallelSurvivorRemarkEnabled)")                           \
1798                                                                             \
1799   product(bool, CMSEdenChunksRecordAlways, true,                            \
1800           "Always record eden chunks used for the parallel initial mark "   \
1801           "or remark of eden")                                              \
1802                                                                             \
1803   product(bool, CMSConcurrentMTEnabled, true,                               \
1804           "Whether multi-threaded concurrent work enabled "                 \
1805           "(effective only if ParNewGC)")                                   \
1806                                                                             \
1807   product(bool, CMSPrecleaningEnabled, true,                                \
1808           "Whether concurrent precleaning enabled")                         \
1809                                                                             \
1810   product(uintx, CMSPrecleanIter, 3,                                        \
1811           "Maximum number of precleaning iteration passes")                 \
1812           range(0, 9)                                                       \
1813                                                                             \
1814   product(uintx, CMSPrecleanDenominator, 3,                                 \
1815           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1816           "ratio")                                                          \
1817           range(1, max_uintx)                                               \
1818           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1819                                                                             \
1820   product(uintx, CMSPrecleanNumerator, 2,                                   \
1821           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1822           "ratio")                                                          \
1823           range(0, max_uintx-1)                                             \
1824           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1825                                                                             \
1826   product(bool, CMSPrecleanRefLists1, true,                                 \
1827           "Preclean ref lists during (initial) preclean phase")             \
1828                                                                             \
1829   product(bool, CMSPrecleanRefLists2, false,                                \
1830           "Preclean ref lists during abortable preclean phase")             \
1831                                                                             \
1832   product(bool, CMSPrecleanSurvivors1, false,                               \
1833           "Preclean survivors during (initial) preclean phase")             \
1834                                                                             \
1835   product(bool, CMSPrecleanSurvivors2, true,                                \
1836           "Preclean survivors during abortable preclean phase")             \
1837                                                                             \
1838   product(uintx, CMSPrecleanThreshold, 1000,                                \
1839           "Do not iterate again if number of dirty cards is less than this")\
1840           range(100, max_uintx)                                             \
1841                                                                             \
1842   product(bool, CMSCleanOnEnter, true,                                      \
1843           "Clean-on-enter optimization for reducing number of dirty cards") \
1844                                                                             \
1845   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1846           "Choose variant (1,2) of verification following remark")          \
1847           range(1, 2)                                                       \
1848                                                                             \
1849   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1850           "If Eden size is below this, do not try to schedule remark")      \
1851           range(0, max_uintx)                                               \
1852                                                                             \
1853   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1854           "The Eden occupancy percentage (0-100) at which "                 \
1855           "to try and schedule remark pause")                               \
1856           range(0, 100)                                                     \
1857                                                                             \
1858   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1859           "Start sampling eden top at least before young gen "              \
1860           "occupancy reaches 1/<ratio> of the size at which "               \
1861           "we plan to schedule remark")                                     \
1862           range(1, max_uintx)                                               \
1863                                                                             \
1864   product(uintx, CMSSamplingGrain, 16*K,                                    \
1865           "The minimum distance between eden samples for CMS (see above)")  \
1866           range(ObjectAlignmentInBytes, max_uintx)                          \
1867           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1868                                                                             \
1869   product(bool, CMSScavengeBeforeRemark, false,                             \
1870           "Attempt scavenge before the CMS remark step")                    \
1871                                                                             \
1872   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1873           "Don't drain below this size per parallel worker/thief")          \
1874           range(1, max_juint)                                               \
1875           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1876                                                                             \
1877   manageable(intx, CMSWaitDuration, 2000,                                   \
1878           "Time in milliseconds that CMS thread waits for young GC")        \
1879           range(min_jint, max_jint)                                         \
1880                                                                             \
1881   develop(uintx, CMSCheckInterval, 1000,                                    \
1882           "Interval in milliseconds that CMS thread checks if it "          \
1883           "should start a collection cycle")                                \
1884                                                                             \
1885   product(bool, CMSYield, true,                                             \
1886           "Yield between steps of CMS")                                     \
1887                                                                             \
1888   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1889           "Bitmap operations should process at most this many bits "        \
1890           "between yields")                                                 \
1891           range(1, max_uintx)                                               \
1892           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1893                                                                             \
1894   product(bool, CMSPrintChunksInDump, false,                                \
1895           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1896           "trace level include more detailed information about the"         \
1897           "free chunks")                \
1898                                                                             \
1899   product(bool, CMSPrintObjectsInDump, false,                               \
1900           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1901           "trace level include more detailed information about the"         \
1902           "allocated objects")                                              \
1903                                                                             \
1904   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1905           "Verify that all references across the FLS boundary "             \
1906           "are to valid objects")                                           \
1907                                                                             \
1908   diagnostic(bool, FLSVerifyLists, false,                                   \
1909           "Do lots of (expensive) FreeListSpace verification")              \
1910                                                                             \
1911   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1912           "Do lots of (expensive) FLS index table verification")            \
1913                                                                             \
1914   develop(bool, FLSVerifyDictionary, false,                                 \
1915           "Do lots of (expensive) FLS dictionary verification")             \
1916                                                                             \
1917   develop(bool, VerifyBlockOffsetArray, false,                              \
1918           "Do (expensive) block offset array verification")                 \
1919                                                                             \
1920   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1921           "Maintain _unallocated_block in BlockOffsetArray "                \
1922           "(currently applicable only to CMS collector)")                   \
1923                                                                             \
1924   product(intx, RefDiscoveryPolicy, 0,                                      \
1925           "Select type of reference discovery policy: "                     \
1926           "reference-based(0) or referent-based(1)")                        \
1927           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1928                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1929                                                                             \
1930   product(bool, ParallelRefProcEnabled, false,                              \
1931           "Enable parallel reference processing whenever possible")         \
1932                                                                             \
1933   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1934           "Enable balancing of reference processing queues")                \
1935                                                                             \
1936   product(uintx, CMSTriggerRatio, 80,                                       \
1937           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1938           "allocated before a CMS collection cycle commences")              \
1939           range(0, 100)                                                     \
1940                                                                             \
1941   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1942           "Percentage CMS generation occupancy at which to "                \
1943           "initiate CMS collection for bootstrapping collection stats")     \
1944           range(0, 100)                                                     \
1945                                                                             \
1946   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1947           "Percentage CMS generation occupancy to start a CMS collection "  \
1948           "cycle. A negative value means that CMSTriggerRatio is used")     \
1949           range(min_intx, 100)                                              \
1950                                                                             \
1951   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1952           "The percent occupancy (IHOP) of the current old generation "     \
1953           "capacity above which a concurrent mark cycle will be initiated " \
1954           "Its value may change over time if adaptive IHOP is enabled, "    \
1955           "otherwise the value remains constant. "                          \
1956           "In the latter case a value of 0 will result as frequent as "     \
1957           "possible concurrent marking cycles. A value of 100 disables "    \
1958           "concurrent marking. "                                            \
1959           "Fragmentation waste in the old generation is not considered "    \
1960           "free space in this calculation. (G1 collector only)")            \
1961           range(0, 100)                                                     \
1962                                                                             \
1963   manageable(intx, CMSTriggerInterval, -1,                                  \
1964           "Commence a CMS collection cycle (at least) every so many "       \
1965           "milliseconds (0 permanently, -1 disabled)")                      \
1966           range(-1, max_intx)                                               \
1967                                                                             \
1968   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1969           "Only use occupancy as a criterion for starting a CMS collection")\
1970                                                                             \
1971   product(uintx, CMSIsTooFullPercentage, 98,                                \
1972           "An absolute ceiling above which CMS will always consider the "   \
1973           "unloading of classes when class unloading is enabled")           \
1974           range(0, 100)                                                     \
1975                                                                             \
1976   develop(bool, CMSTestInFreeList, false,                                   \
1977           "Check if the coalesced range is already in the "                 \
1978           "free lists as claimed")                                          \
1979                                                                             \
1980   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1981           "Check that all the garbage collected was returned to the "       \
1982           "free lists")                                                     \
1983                                                                             \
1984   notproduct(bool, ScavengeALot, false,                                     \
1985           "Force scavenge at every Nth exit from the runtime system "       \
1986           "(N=ScavengeALotInterval)")                                       \
1987                                                                             \
1988   develop(bool, FullGCALot, false,                                          \
1989           "Force full gc at every Nth exit from the runtime system "        \
1990           "(N=FullGCALotInterval)")                                         \
1991                                                                             \
1992   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1993           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1994                                                                             \
1995   notproduct(bool, PromotionFailureALot, false,                             \
1996           "Use promotion failure handling on every youngest generation "    \
1997           "collection")                                                     \
1998                                                                             \
1999   develop(uintx, PromotionFailureALotCount, 1000,                           \
2000           "Number of promotion failures occurring at PLAB "                 \
2001           "refill attempts (ParNew) or promotion attempts "                 \
2002           "(other young collectors)")                                       \
2003                                                                             \
2004   develop(uintx, PromotionFailureALotInterval, 5,                           \
2005           "Total collections between promotion failures a lot")             \
2006                                                                             \
2007   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2008           "Sleep time when sleep is used for yields")                       \
2009                                                                             \
2010   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2011           "Number of yields before a sleep is done during work stealing")   \
2012                                                                             \
2013   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2014           "Number of iterations in a spin loop between checks on "          \
2015           "time out of hard spin")                                          \
2016                                                                             \
2017   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2018           "Ratio of hard spins to calls to yield")                          \
2019                                                                             \
2020   develop(uintx, ObjArrayMarkingStride, 2048,                               \
2021           "Number of object array elements to push onto the marking stack " \
2022           "before pushing a continuation entry")                            \
2023                                                                             \
2024   develop(bool, MetadataAllocationFailALot, false,                          \
2025           "Fail metadata allocations at intervals controlled by "           \
2026           "MetadataAllocationFailALotInterval")                             \
2027                                                                             \
2028   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2029           "Metadata allocation failure a lot interval")                     \
2030                                                                             \
2031   notproduct(bool, ExecuteInternalVMTests, false,                           \
2032           "Enable execution of internal VM tests")                          \
2033                                                                             \
2034   notproduct(bool, VerboseInternalVMTests, false,                           \
2035           "Turn on logging for internal VM tests.")                         \
2036                                                                             \
2037   product(bool, ExecutingUnitTests, false,                                  \
2038           "Whether the JVM is running unit tests or not")                   \
2039                                                                             \
2040   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2041                                                                             \
2042   product_pd(bool, ResizeTLAB,                                              \
2043           "Dynamically resize TLAB size for threads")                       \
2044                                                                             \
2045   product(bool, ZeroTLAB, false,                                            \
2046           "Zero out the newly created TLAB")                                \
2047                                                                             \
2048   product(bool, FastTLABRefill, false,                                      \
2049           "(Deprecated) Use fast TLAB refill code")                         \
2050                                                                             \
2051   product(bool, TLABStats, true,                                            \
2052           "Provide more detailed and expensive TLAB statistics.")           \
2053                                                                             \
2054   product_pd(bool, NeverActAsServerClassMachine,                            \
2055           "Never act like a server-class machine")                          \
2056                                                                             \
2057   product(bool, AlwaysActAsServerClassMachine, false,                       \
2058           "Always act like a server-class machine")                         \
2059                                                                             \
2060   product_pd(uint64_t, MaxRAM,                                              \
2061           "Real memory size (in bytes) used to set maximum heap size")      \
2062           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2063                                                                             \
2064   product(bool, AggressiveHeap, false,                                      \
2065           "Optimize heap options for long-running memory intensive apps")   \
2066                                                                             \
2067   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2068           "Maximum ergonomically set heap size (in bytes); zero means use " \
2069           "MaxRAM * MaxRAMPercentage / 100")                                \
2070           range(0, max_uintx)                                               \
2071                                                                             \
2072   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2073           "Use CGroup memory limit as physical memory limit for heap "      \
2074           "sizing"                                                          \
2075           "Deprecated, replaced by container support")                      \
2076                                                                             \
2077   product(uintx, MaxRAMFraction, 4,                                         \
2078           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2079           "size. "                                                          \
2080           "Deprecated, use MaxRAMPercentage instead")                       \
2081           range(1, max_uintx)                                               \
2082                                                                             \
2083   product(uintx, MinRAMFraction, 2,                                         \
2084           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2085           "size on systems with small physical memory size. "               \
2086           "Deprecated, use MinRAMPercentage instead")                       \
2087           range(1, max_uintx)                                               \
2088                                                                             \
2089   product(uintx, InitialRAMFraction, 64,                                    \
2090           "Fraction (1/n) of real memory used for initial heap size. "      \
2091           "Deprecated, use InitialRAMPercentage instead")                   \
2092           range(1, max_uintx)                                               \
2093                                                                             \
2094   product(double, MaxRAMPercentage, 25.0,                                   \
2095           "Maximum percentage of real memory used for maximum heap size")   \
2096           range(0.0, 100.0)                                                 \
2097                                                                             \
2098   product(double, MinRAMPercentage, 50.0,                                   \
2099           "Minimum percentage of real memory used for maximum heap"         \
2100           "size on systems with small physical memory size")                \
2101           range(0.0, 100.0)                                                 \
2102                                                                             \
2103   product(double, InitialRAMPercentage, 1.5625,                             \
2104           "Percentage of real memory used for initial heap size")           \
2105           range(0.0, 100.0)                                                 \
2106                                                                             \
2107   product(int, ActiveProcessorCount, -1,                                    \
2108           "Specify the CPU count the VM should use and report as active")   \
2109                                                                             \
2110   develop(uintx, MaxVirtMemFraction, 2,                                     \
2111           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2112           "determining maximum heap size")                                  \
2113                                                                             \
2114   product(bool, UseAdaptiveSizePolicy, true,                                \
2115           "Use adaptive generation sizing policies")                        \
2116                                                                             \
2117   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2118           "Use adaptive survivor sizing policies")                          \
2119                                                                             \
2120   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2121           "Use adaptive young-old sizing policies at minor collections")    \
2122                                                                             \
2123   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2124           "Use adaptive young-old sizing policies at major collections")    \
2125                                                                             \
2126   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2127           "Include statistics from System.gc() for adaptive size policy")   \
2128                                                                             \
2129   product(bool, UseAdaptiveGCBoundary, false,                               \
2130           "Allow young-old boundary to move")                               \
2131                                                                             \
2132   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2133           "Resize the virtual spaces of the young or old generations")      \
2134           range(-1, 1)                                                      \
2135                                                                             \
2136   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2137           "Policy for changing generation size for throughput goals")       \
2138           range(0, 1)                                                       \
2139                                                                             \
2140   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2141           "Number of steps where heuristics is used before data is used")   \
2142           range(0, max_uintx)                                               \
2143                                                                             \
2144   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2145           "Number of collections before the adaptive sizing is started")    \
2146                                                                             \
2147   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2148           "Collection interval for printing information; zero means never") \
2149           range(0, max_uintx)                                               \
2150                                                                             \
2151   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2152           "Use adaptive minimum footprint as a goal")                       \
2153                                                                             \
2154   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2155           "Weight given to exponential resizing, between 0 and 100")        \
2156           range(0, 100)                                                     \
2157                                                                             \
2158   product(uintx, AdaptiveTimeWeight,       25,                              \
2159           "Weight given to time in adaptive policy, between 0 and 100")     \
2160           range(0, 100)                                                     \
2161                                                                             \
2162   product(uintx, PausePadding, 1,                                           \
2163           "How much buffer to keep for pause time")                         \
2164           range(0, max_juint)                                               \
2165                                                                             \
2166   product(uintx, PromotedPadding, 3,                                        \
2167           "How much buffer to keep for promotion failure")                  \
2168           range(0, max_juint)                                               \
2169                                                                             \
2170   product(uintx, SurvivorPadding, 3,                                        \
2171           "How much buffer to keep for survivor overflow")                  \
2172           range(0, max_juint)                                               \
2173                                                                             \
2174   product(uintx, ThresholdTolerance, 10,                                    \
2175           "Allowed collection cost difference between generations")         \
2176           range(0, 100)                                                     \
2177                                                                             \
2178   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2179           "If collection costs are within margin, reduce both by full "     \
2180           "delta")                                                          \
2181           range(0, 100)                                                     \
2182                                                                             \
2183   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2184           "Adaptive size percentage change in young generation")            \
2185           range(0, 100)                                                     \
2186                                                                             \
2187   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2188           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2189           range(0, 100)                                                     \
2190                                                                             \
2191   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2192           "Decay factor to YoungedGenerationSizeSupplement")                \
2193           range(1, max_uintx)                                               \
2194                                                                             \
2195   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2196           "Adaptive size percentage change in tenured generation")          \
2197           range(0, 100)                                                     \
2198                                                                             \
2199   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2200           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2201           range(0, 100)                                                     \
2202                                                                             \
2203   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2204           "Decay factor to TenuredGenerationSizeIncrement")                 \
2205           range(1, max_uintx)                                               \
2206                                                                             \
2207   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2208           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2209           "or (G1 Only) the maximum GC time per MMU time slice")            \
2210           range(1, max_uintx - 1)                                           \
2211           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2212                                                                             \
2213   product(uintx, GCPauseIntervalMillis, 0,                                  \
2214           "Time slice for MMU specification")                               \
2215           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2216                                                                             \
2217   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2218           "Adaptive size policy maximum GC minor pause time goal "          \
2219           "in millisecond")                                                 \
2220           range(0, max_uintx)                                               \
2221                                                                             \
2222   product(uintx, GCTimeRatio, 99,                                           \
2223           "Adaptive size policy application time to GC time ratio")         \
2224           range(0, max_juint)                                               \
2225                                                                             \
2226   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2227           "Adaptive size scale down factor for shrinking")                  \
2228           range(1, max_uintx)                                               \
2229                                                                             \
2230   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2231           "Adaptive size decays the major cost for long major intervals")   \
2232                                                                             \
2233   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2234           "Time scale over which major costs decay")                        \
2235           range(0, max_uintx)                                               \
2236                                                                             \
2237   product(uintx, MinSurvivorRatio, 3,                                       \
2238           "Minimum ratio of young generation/survivor space size")          \
2239           range(3, max_uintx)                                               \
2240                                                                             \
2241   product(uintx, InitialSurvivorRatio, 8,                                   \
2242           "Initial ratio of young generation/survivor space size")          \
2243           range(0, max_uintx)                                               \
2244                                                                             \
2245   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2246           "Estimate of footprint other than Java Heap")                     \
2247           range(0, max_uintx)                                               \
2248                                                                             \
2249   product(bool, UseGCOverheadLimit, true,                                   \
2250           "Use policy to limit of proportion of time spent in GC "          \
2251           "before an OutOfMemory error is thrown")                          \
2252                                                                             \
2253   product(uintx, GCTimeLimit, 98,                                           \
2254           "Limit of the proportion of time spent in GC before "             \
2255           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2256           range(0, 100)                                                     \
2257                                                                             \
2258   product(uintx, GCHeapFreeLimit, 2,                                        \
2259           "Minimum percentage of free space after a full GC before an "     \
2260           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2261           range(0, 100)                                                     \
2262                                                                             \
2263   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2264           "Number of consecutive collections before gc time limit fires")   \
2265           range(1, max_uintx)                                               \
2266                                                                             \
2267   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2268           "How far ahead to prefetch destination area (<= 0 means off)")    \
2269           range(-1, max_jint)                                               \
2270                                                                             \
2271   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2272           "How far ahead to prefetch scan area (<= 0 means off)")           \
2273           range(-1, max_jint)                                               \
2274                                                                             \
2275   product(intx, PrefetchFieldsAhead, -1,                                    \
2276           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2277           range(-1, max_jint)                                               \
2278                                                                             \
2279   diagnostic(bool, VerifyDuringStartup, false,                              \
2280           "Verify memory system before executing any Java code "            \
2281           "during VM initialization")                                       \
2282                                                                             \
2283   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2284           "Verify system before exiting")                                   \
2285                                                                             \
2286   diagnostic(bool, VerifyBeforeGC, false,                                   \
2287           "Verify memory system before GC")                                 \
2288                                                                             \
2289   diagnostic(bool, VerifyAfterGC, false,                                    \
2290           "Verify memory system after GC")                                  \
2291                                                                             \
2292   diagnostic(bool, VerifyDuringGC, false,                                   \
2293           "Verify memory system during GC (between phases)")                \
2294                                                                             \
2295   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2296           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2297           "are enabled. One or more sub-systems can be specified "          \
2298           "in a comma separated string. Sub-systems are: "                  \
2299           "threads, heap, symbol_table, string_table, codecache, "          \
2300           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2301           "codecache_oops")                                                 \
2302                                                                             \
2303   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2304           "Enable parallel memory system verification")                     \
2305                                                                             \
2306   diagnostic(bool, DeferInitialCardMark, false,                             \
2307           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2308           "may arise from new_pre_store_barrier")                           \
2309                                                                             \
2310   product(bool, UseCondCardMark, false,                                     \
2311           "Check for already marked card before updating card table")       \
2312                                                                             \
2313   diagnostic(bool, VerifyRememberedSets, false,                             \
2314           "Verify GC remembered sets")                                      \
2315                                                                             \
2316   diagnostic(bool, VerifyObjectStartArray, true,                            \
2317           "Verify GC object start array if verify before/after")            \
2318                                                                             \
2319   product(bool, DisableExplicitGC, false,                                   \
2320           "Ignore calls to System.gc()")                                    \
2321                                                                             \
2322   notproduct(bool, CheckMemoryInitialization, false,                        \
2323           "Check memory initialization")                                    \
2324                                                                             \
2325   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2326           "Bind CMS Thread to CPU if possible")                             \
2327                                                                             \
2328   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2329           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2330           range(0, max_juint)                                               \
2331                                                                             \
2332   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2333           "Bind GCTaskThreads to CPUs if possible")                         \
2334                                                                             \
2335   product(bool, UseGCTaskAffinity, false,                                   \
2336           "Use worker affinity when asking for GCTasks")                    \
2337                                                                             \
2338   product(uintx, ProcessDistributionStride, 4,                              \
2339           "Stride through processors when distributing processes")          \
2340           range(0, max_juint)                                               \
2341                                                                             \
2342   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2343           "Number of times the coordinator GC thread will sleep while "     \
2344           "yielding before giving up and resuming GC")                      \
2345           range(0, max_juint)                                               \
2346                                                                             \
2347   product(uintx, CMSYieldSleepCount, 0,                                     \
2348           "Number of times a GC thread (minus the coordinator) "            \
2349           "will sleep while yielding before giving up and resuming GC")     \
2350           range(0, max_juint)                                               \
2351                                                                             \
2352   product(bool, PrintGC, false,                                             \
2353           "Print message at garbage collection. "                           \
2354           "Deprecated, use -Xlog:gc instead.")                              \
2355                                                                             \
2356   product(bool, PrintGCDetails, false,                                      \
2357           "Print more details at garbage collection. "                      \
2358           "Deprecated, use -Xlog:gc* instead.")                             \
2359                                                                             \
2360   develop(intx, ConcGCYieldTimeout, 0,                                      \
2361           "If non-zero, assert that GC threads yield within this "          \
2362           "number of milliseconds")                                         \
2363           range(0, max_intx)                                                \
2364                                                                             \
2365   develop(bool, TraceFinalizerRegistration, false,                          \
2366           "Trace registration of final references")                         \
2367                                                                             \
2368   notproduct(bool, TraceScavenge, false,                                    \
2369           "Trace scavenge")                                                 \
2370                                                                             \
2371   product(bool, IgnoreEmptyClassPaths, false,                               \
2372           "Ignore empty path elements in -classpath")                       \
2373                                                                             \
2374   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2375           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2376           "Initial size of the boot class loader data metaspace")           \
2377           range(30*K, max_uintx/BytesPerWord)                               \
2378           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2379                                                                             \
2380   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2381           "Print heap layout in response to SIGBREAK")                      \
2382                                                                             \
2383   manageable(bool, PrintClassHistogram, false,                              \
2384           "Print a histogram of class instances")                           \
2385                                                                             \
2386   develop(bool, TraceGCTaskManager, false,                                  \
2387           "Trace actions of the GC task manager")                           \
2388                                                                             \
2389   develop(bool, TraceGCTaskQueue, false,                                    \
2390           "Trace actions of the GC task queues")                            \
2391                                                                             \
2392   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2393           "Trace marking phase in ParallelOldGC")                           \
2394                                                                             \
2395   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2396           "Trace dense prefix computation for ParallelOldGC")               \
2397                                                                             \
2398   develop(bool, IgnoreLibthreadGPFault, false,                              \
2399           "Suppress workaround for libthread GP fault")                     \
2400                                                                             \
2401   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2402           "The percentage of the used heap that the instances of a class "  \
2403           "must occupy for the class to generate a trace event")            \
2404           range(0.0, 100.0)                                                 \
2405                                                                             \
2406   /* JVMTI heap profiling */                                                \
2407                                                                             \
2408   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2409           "Trace JVMTI object tagging calls")                               \
2410                                                                             \
2411   diagnostic(bool, VerifyBeforeIteration, false,                            \
2412           "Verify memory system before JVMTI iteration")                    \
2413                                                                             \
2414   /* compiler interface */                                                  \
2415                                                                             \
2416   develop(bool, CIPrintCompilerName, false,                                 \
2417           "when CIPrint is active, print the name of the active compiler")  \
2418                                                                             \
2419   diagnostic(bool, CIPrintCompileQueue, false,                              \
2420           "display the contents of the compile queue whenever a "           \
2421           "compilation is enqueued")                                        \
2422                                                                             \
2423   develop(bool, CIPrintRequests, false,                                     \
2424           "display every request for compilation")                          \
2425                                                                             \
2426   product(bool, CITime, false,                                              \
2427           "collect timing information for compilation")                     \
2428                                                                             \
2429   develop(bool, CITimeVerbose, false,                                       \
2430           "be more verbose in compilation timings")                         \
2431                                                                             \
2432   develop(bool, CITimeEach, false,                                          \
2433           "display timing information after each successful compilation")   \
2434                                                                             \
2435   develop(bool, CICountOSR, false,                                          \
2436           "use a separate counter when assigning ids to osr compilations")  \
2437                                                                             \
2438   develop(bool, CICompileNatives, true,                                     \
2439           "compile native methods if supported by the compiler")            \
2440                                                                             \
2441   develop_pd(bool, CICompileOSR,                                            \
2442           "compile on stack replacement methods if supported by the "       \
2443           "compiler")                                                       \
2444                                                                             \
2445   develop(bool, CIPrintMethodCodes, false,                                  \
2446           "print method bytecodes of the compiled code")                    \
2447                                                                             \
2448   develop(bool, CIPrintTypeFlow, false,                                     \
2449           "print the results of ciTypeFlow analysis")                       \
2450                                                                             \
2451   develop(bool, CITraceTypeFlow, false,                                     \
2452           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2453                                                                             \
2454   develop(intx, OSROnlyBCI, -1,                                             \
2455           "OSR only at this bci.  Negative values mean exclude that bci")   \
2456                                                                             \
2457   /* compiler */                                                            \
2458                                                                             \
2459   /* notice: the max range value here is max_jint, not max_intx  */         \
2460   /* because of overflow issue                                   */         \
2461   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2462           "Number of compiler threads to run")                              \
2463           range(0, max_jint)                                                \
2464           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2465                                                                             \
2466   product(intx, CompilationPolicyChoice, 0,                                 \
2467           "which compilation policy (0-3)")                                 \
2468           range(0, 3)                                                       \
2469                                                                             \
2470   develop(bool, UseStackBanging, true,                                      \
2471           "use stack banging for stack overflow checks (required for "      \
2472           "proper StackOverflow handling; disable only to measure cost "    \
2473           "of stackbanging)")                                               \
2474                                                                             \
2475   develop(bool, UseStrictFP, true,                                          \
2476           "use strict fp if modifier strictfp is set")                      \
2477                                                                             \
2478   develop(bool, GenerateSynchronizationCode, true,                          \
2479           "generate locking/unlocking code for synchronized methods and "   \
2480           "monitors")                                                       \
2481                                                                             \
2482   develop(bool, GenerateRangeChecks, true,                                  \
2483           "Generate range checks for array accesses")                       \
2484                                                                             \
2485   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2486           "Generate code for implicit null checks")                         \
2487                                                                             \
2488   product_pd(bool, TrapBasedNullChecks,                                     \
2489           "Generate code for null checks that uses a cmp and trap "         \
2490           "instruction raising SIGTRAP.  This is only used if an access to" \
2491           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2492           "ImplicitNullChecks don't work (PPC64).")                         \
2493                                                                             \
2494   product(bool, PrintSafepointStatistics, false,                            \
2495           "Print statistics about safepoint synchronization")               \
2496                                                                             \
2497   product(intx, PrintSafepointStatisticsCount, 300,                         \
2498           "Total number of safepoint statistics collected "                 \
2499           "before printing them out")                                       \
2500           range(1, max_intx)                                                \
2501                                                                             \
2502   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2503           "Print safepoint statistics only when safepoint takes "           \
2504           "more than PrintSafepointSatisticsTimeout in millis")             \
2505   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2506   NOT_LP64(range(-1, max_intx))                                             \
2507                                                                             \
2508   product(bool, Inline, true,                                               \
2509           "Enable inlining")                                                \
2510                                                                             \
2511   product(bool, ClipInlining, true,                                         \
2512           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2513                                                                             \
2514   develop(bool, UseCHA, true,                                               \
2515           "Enable CHA")                                                     \
2516                                                                             \
2517   product(bool, UseTypeProfile, true,                                       \
2518           "Check interpreter profile for historically monomorphic calls")   \
2519                                                                             \
2520   diagnostic(bool, PrintInlining, false,                                    \
2521           "Print inlining optimizations")                                   \
2522                                                                             \
2523   product(bool, UsePopCountInstruction, false,                              \
2524           "Use population count instruction")                               \
2525                                                                             \
2526   develop(bool, EagerInitialization, false,                                 \
2527           "Eagerly initialize classes if possible")                         \
2528                                                                             \
2529   diagnostic(bool, LogTouchedMethods, false,                                \
2530           "Log methods which have been ever touched in runtime")            \
2531                                                                             \
2532   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2533           "Print all methods that have been ever touched in runtime")       \
2534                                                                             \
2535   develop(bool, TraceMethodReplacement, false,                              \
2536           "Print when methods are replaced do to recompilation")            \
2537                                                                             \
2538   develop(bool, PrintMethodFlushing, false,                                 \
2539           "Print the nmethods being flushed")                               \
2540                                                                             \
2541   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2542           "print statistics about method flushing")                         \
2543                                                                             \
2544   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2545           "Number of compiled code invocations after which "                \
2546           "the method is considered as hot by the flusher")                 \
2547           range(1, max_jint)                                                \
2548                                                                             \
2549   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2550           "Minimum number of sweeper passes before an nmethod "             \
2551           "can be flushed")                                                 \
2552           range(0, max_intx)                                                \
2553                                                                             \
2554   product(bool, UseCodeAging, true,                                         \
2555           "Insert counter to detect warm methods")                          \
2556                                                                             \
2557   diagnostic(bool, StressCodeAging, false,                                  \
2558           "Start with counters compiled in")                                \
2559                                                                             \
2560   develop(bool, StressCodeBuffers, false,                                   \
2561           "Exercise code buffer expansion and other rare state changes")    \
2562                                                                             \
2563   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2564           "Generate extra debugging information for non-safepoints in "     \
2565           "nmethods")                                                       \
2566                                                                             \
2567   product(bool, PrintVMOptions, false,                                      \
2568           "Print flags that appeared on the command line")                  \
2569                                                                             \
2570   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2571           "Ignore unrecognized VM options")                                 \
2572                                                                             \
2573   product(bool, PrintCommandLineFlags, false,                               \
2574           "Print flags specified on command line or set by ergonomics")     \
2575                                                                             \
2576   product(bool, PrintFlagsInitial, false,                                   \
2577           "Print all VM flags before argument processing and exit VM")      \
2578                                                                             \
2579   product(bool, PrintFlagsFinal, false,                                     \
2580           "Print all VM flags after argument and ergonomic processing")     \
2581                                                                             \
2582   notproduct(bool, PrintFlagsWithComments, false,                           \
2583           "Print all VM flags with default values and descriptions and "    \
2584           "exit")                                                           \
2585                                                                             \
2586   product(bool, PrintFlagsRanges, false,                                    \
2587           "Print VM flags and their ranges and exit VM")                    \
2588                                                                             \
2589   diagnostic(bool, SerializeVMOutput, true,                                 \
2590           "Use a mutex to serialize output to tty and LogFile")             \
2591                                                                             \
2592   diagnostic(bool, DisplayVMOutput, true,                                   \
2593           "Display all VM output on the tty, independently of LogVMOutput") \
2594                                                                             \
2595   diagnostic(bool, LogVMOutput, false,                                      \
2596           "Save VM output to LogFile")                                      \
2597                                                                             \
2598   diagnostic(ccstr, LogFile, NULL,                                          \
2599           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2600           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2601                                                                             \
2602   product(ccstr, ErrorFile, NULL,                                           \
2603           "If an error occurs, save the error data to this file "           \
2604           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2605                                                                             \
2606   product(bool, DisplayVMOutputToStderr, false,                             \
2607           "If DisplayVMOutput is true, display all VM output to stderr")    \
2608                                                                             \
2609   product(bool, DisplayVMOutputToStdout, false,                             \
2610           "If DisplayVMOutput is true, display all VM output to stdout")    \
2611                                                                             \
2612   product(bool, UseHeavyMonitors, false,                                    \
2613           "use heavyweight instead of lightweight Java monitors")           \
2614                                                                             \
2615   product(bool, PrintStringTableStatistics, false,                          \
2616           "print statistics about the StringTable and SymbolTable")         \
2617                                                                             \
2618   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2619           "verify StringTable contents at exit")                            \
2620                                                                             \
2621   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2622           "print histogram of the symbol table")                            \
2623                                                                             \
2624   notproduct(bool, ExitVMOnVerifyError, false,                              \
2625           "standard exit from VM if bytecode verify error "                 \
2626           "(only in debug mode)")                                           \
2627                                                                             \
2628   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2629           "Call fatal if this exception is thrown.  Example: "              \
2630           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2631                                                                             \
2632   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2633           "Call fatal if the exception pointed by AbortVMOnException "      \
2634           "has this message")                                               \
2635                                                                             \
2636   develop(bool, DebugVtables, false,                                        \
2637           "add debugging code to vtable dispatch")                          \
2638                                                                             \
2639   notproduct(bool, PrintVtableStats, false,                                 \
2640           "print vtables stats at end of run")                              \
2641                                                                             \
2642   develop(bool, TraceCreateZombies, false,                                  \
2643           "trace creation of zombie nmethods")                              \
2644                                                                             \
2645   notproduct(bool, IgnoreLockingAssertions, false,                          \
2646           "disable locking assertions (for speed)")                         \
2647                                                                             \
2648   product(bool, RangeCheckElimination, true,                                \
2649           "Eliminate range checks")                                         \
2650                                                                             \
2651   develop_pd(bool, UncommonNullCast,                                        \
2652           "track occurrences of null in casts; adjust compiler tactics")    \
2653                                                                             \
2654   develop(bool, TypeProfileCasts,  true,                                    \
2655           "treat casts like calls for purposes of type profiling")          \
2656                                                                             \
2657   develop(bool, DelayCompilationDuringStartup, true,                        \
2658           "Delay invoking the compiler until main application class is "    \
2659           "loaded")                                                         \
2660                                                                             \
2661   develop(bool, CompileTheWorld, false,                                     \
2662           "Compile all methods in all classes in bootstrap class path "     \
2663             "(stress test)")                                                \
2664                                                                             \
2665   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2666           "Preload all classes used by a class before start loading")       \
2667                                                                             \
2668   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2669           "Force a safepoint every n compiles so sweeper can keep up")      \
2670                                                                             \
2671   develop(bool, FillDelaySlots, true,                                       \
2672           "Fill delay slots (on SPARC only)")                               \
2673                                                                             \
2674   develop(bool, TimeLivenessAnalysis, false,                                \
2675           "Time computation of bytecode liveness analysis")                 \
2676                                                                             \
2677   develop(bool, TraceLivenessGen, false,                                    \
2678           "Trace the generation of liveness analysis information")          \
2679                                                                             \
2680   notproduct(bool, TraceLivenessQuery, false,                               \
2681           "Trace queries of liveness analysis information")                 \
2682                                                                             \
2683   notproduct(bool, CollectIndexSetStatistics, false,                        \
2684           "Collect information about IndexSets")                            \
2685                                                                             \
2686   develop(bool, UseLoopSafepoints, true,                                    \
2687           "Generate Safepoint nodes in every loop")                         \
2688                                                                             \
2689   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2690           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2691           "Inline allocations larger than this in doublewords must go slow")\
2692                                                                             \
2693   product(bool, AggressiveOpts, false,                                      \
2694           "Enable aggressive optimizations - see arguments.cpp")            \
2695                                                                             \
2696   product_pd(bool, CompactStrings,                                          \
2697           "Enable Strings to use single byte chars in backing store")       \
2698                                                                             \
2699   product_pd(uintx, TypeProfileLevel,                                       \
2700           "=XYZ, with Z: Type profiling of arguments at call; "             \
2701                      "Y: Type profiling of return value at call; "          \
2702                      "X: Type profiling of parameters to methods; "         \
2703           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2704           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2705                                                                             \
2706   product(intx, TypeProfileArgsLimit,     2,                                \
2707           "max number of call arguments to consider for type profiling")    \
2708           range(0, 16)                                                      \
2709                                                                             \
2710   product(intx, TypeProfileParmsLimit,    2,                                \
2711           "max number of incoming parameters to consider for type profiling"\
2712           ", -1 for all")                                                   \
2713           range(-1, 64)                                                     \
2714                                                                             \
2715   /* statistics */                                                          \
2716   develop(bool, CountCompiledCalls, false,                                  \
2717           "Count method invocations")                                       \
2718                                                                             \
2719   notproduct(bool, CountRuntimeCalls, false,                                \
2720           "Count VM runtime calls")                                         \
2721                                                                             \
2722   develop(bool, CountJNICalls, false,                                       \
2723           "Count jni method invocations")                                   \
2724                                                                             \
2725   notproduct(bool, CountJVMCalls, false,                                    \
2726           "Count jvm method invocations")                                   \
2727                                                                             \
2728   notproduct(bool, CountRemovableExceptions, false,                         \
2729           "Count exceptions that could be replaced by branches due to "     \
2730           "inlining")                                                       \
2731                                                                             \
2732   notproduct(bool, ICMissHistogram, false,                                  \
2733           "Produce histogram of IC misses")                                 \
2734                                                                             \
2735   /* interpreter */                                                         \
2736   product_pd(bool, RewriteBytecodes,                                        \
2737           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2738                                                                             \
2739   product_pd(bool, RewriteFrequentPairs,                                    \
2740           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2741                                                                             \
2742   diagnostic(bool, PrintInterpreter, false,                                 \
2743           "Print the generated interpreter code")                           \
2744                                                                             \
2745   product(bool, UseInterpreter, true,                                       \
2746           "Use interpreter for non-compiled methods")                       \
2747                                                                             \
2748   develop(bool, UseFastSignatureHandlers, true,                             \
2749           "Use fast signature handlers for native calls")                   \
2750                                                                             \
2751   product(bool, UseLoopCounter, true,                                       \
2752           "Increment invocation counter on backward branch")                \
2753                                                                             \
2754   product_pd(bool, UseOnStackReplacement,                                   \
2755           "Use on stack replacement, calls runtime if invoc. counter "      \
2756           "overflows in loop")                                              \
2757                                                                             \
2758   notproduct(bool, TraceOnStackReplacement, false,                          \
2759           "Trace on stack replacement")                                     \
2760                                                                             \
2761   product_pd(bool, PreferInterpreterNativeStubs,                            \
2762           "Use always interpreter stubs for native methods invoked via "    \
2763           "interpreter")                                                    \
2764                                                                             \
2765   develop(bool, CountBytecodes, false,                                      \
2766           "Count number of bytecodes executed")                             \
2767                                                                             \
2768   develop(bool, PrintBytecodeHistogram, false,                              \
2769           "Print histogram of the executed bytecodes")                      \
2770                                                                             \
2771   develop(bool, PrintBytecodePairHistogram, false,                          \
2772           "Print histogram of the executed bytecode pairs")                 \
2773                                                                             \
2774   diagnostic(bool, PrintSignatureHandlers, false,                           \
2775           "Print code generated for native method signature handlers")      \
2776                                                                             \
2777   develop(bool, VerifyOops, false,                                          \
2778           "Do plausibility checks for oops")                                \
2779                                                                             \
2780   develop(bool, CheckUnhandledOops, false,                                  \
2781           "Check for unhandled oops in VM code")                            \
2782                                                                             \
2783   develop(bool, VerifyJNIFields, trueInDebug,                               \
2784           "Verify jfieldIDs for instance fields")                           \
2785                                                                             \
2786   notproduct(bool, VerifyJNIEnvThread, false,                               \
2787           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2788           "from JNI")                                                       \
2789                                                                             \
2790   develop(bool, VerifyFPU, false,                                           \
2791           "Verify FPU state (check for NaN's, etc.)")                       \
2792                                                                             \
2793   develop(bool, VerifyThread, false,                                        \
2794           "Watch the thread register for corruption (SPARC only)")          \
2795                                                                             \
2796   develop(bool, VerifyActivationFrameSize, false,                           \
2797           "Verify that activation frame didn't become smaller than its "    \
2798           "minimal size")                                                   \
2799                                                                             \
2800   develop(bool, TraceFrequencyInlining, false,                              \
2801           "Trace frequency based inlining")                                 \
2802                                                                             \
2803   develop_pd(bool, InlineIntrinsics,                                        \
2804           "Inline intrinsics that can be statically resolved")              \
2805                                                                             \
2806   product_pd(bool, ProfileInterpreter,                                      \
2807           "Profile at the bytecode level during interpretation")            \
2808                                                                             \
2809   develop(bool, TraceProfileInterpreter, false,                             \
2810           "Trace profiling at the bytecode level during interpretation. "   \
2811           "This outputs the profiling information collected to improve "    \
2812           "jit compilation.")                                               \
2813                                                                             \
2814   develop_pd(bool, ProfileTraps,                                            \
2815           "Profile deoptimization traps at the bytecode level")             \
2816                                                                             \
2817   product(intx, ProfileMaturityPercentage, 20,                              \
2818           "number of method invocations/branches (expressed as % of "       \
2819           "CompileThreshold) before using the method's profile")            \
2820           range(0, 100)                                                     \
2821                                                                             \
2822   diagnostic(bool, PrintMethodData, false,                                  \
2823           "Print the results of +ProfileInterpreter at end of run")         \
2824                                                                             \
2825   develop(bool, VerifyDataPointer, trueInDebug,                             \
2826           "Verify the method data pointer during interpreter profiling")    \
2827                                                                             \
2828   develop(bool, VerifyCompiledCode, false,                                  \
2829           "Include miscellaneous runtime verifications in nmethod code; "   \
2830           "default off because it disturbs nmethod size heuristics")        \
2831                                                                             \
2832   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2833           "Manually make GC thread crash then dump java stack trace;  "     \
2834           "Test only")                                                      \
2835                                                                             \
2836   /* compilation */                                                         \
2837   product(bool, UseCompiler, true,                                          \
2838           "Use Just-In-Time compilation")                                   \
2839                                                                             \
2840   develop(bool, TraceCompilationPolicy, false,                              \
2841           "Trace compilation policy")                                       \
2842                                                                             \
2843   develop(bool, TimeCompilationPolicy, false,                               \
2844           "Time the compilation policy")                                    \
2845                                                                             \
2846   product(bool, UseCounterDecay, true,                                      \
2847           "Adjust recompilation counters")                                  \
2848                                                                             \
2849   develop(intx, CounterHalfLifeTime,    30,                                 \
2850           "Half-life time of invocation counters (in seconds)")             \
2851                                                                             \
2852   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2853           "The minimum interval (in milliseconds) between invocation of "   \
2854           "CounterDecay")                                                   \
2855                                                                             \
2856   product(bool, AlwaysCompileLoopMethods, false,                            \
2857           "When using recompilation, never interpret methods "              \
2858           "containing loops")                                               \
2859                                                                             \
2860   product(bool, DontCompileHugeMethods, true,                               \
2861           "Do not compile methods > HugeMethodLimit")                       \
2862                                                                             \
2863   /* Bytecode escape analysis estimation. */                                \
2864   product(bool, EstimateArgEscape, true,                                    \
2865           "Analyze bytecodes to estimate escape state of arguments")        \
2866                                                                             \
2867   product(intx, BCEATraceLevel, 0,                                          \
2868           "How much tracing to do of bytecode escape analysis estimates "   \
2869           "(0-3)")                                                          \
2870           range(0, 3)                                                       \
2871                                                                             \
2872   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2873           "Maximum number of nested calls that are analyzed by BC EA")      \
2874           range(0, max_jint)                                                \
2875                                                                             \
2876   product(intx, MaxBCEAEstimateSize, 150,                                   \
2877           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2878           range(0, max_jint)                                                \
2879                                                                             \
2880   product(intx,  AllocatePrefetchStyle, 1,                                  \
2881           "0 = no prefetch, "                                               \
2882           "1 = generate prefetch instructions for each allocation, "        \
2883           "2 = use TLAB watermark to gate allocation prefetch, "            \
2884           "3 = generate one prefetch instruction per cache line")           \
2885           range(0, 3)                                                       \
2886                                                                             \
2887   product(intx,  AllocatePrefetchDistance, -1,                              \
2888           "Distance to prefetch ahead of allocation pointer. "              \
2889           "-1: use system-specific value (automatically determined")        \
2890           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2891                                                                             \
2892   product(intx,  AllocatePrefetchLines, 3,                                  \
2893           "Number of lines to prefetch ahead of array allocation pointer")  \
2894           range(1, 64)                                                      \
2895                                                                             \
2896   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2897           "Number of lines to prefetch ahead of instance allocation "       \
2898           "pointer")                                                        \
2899           range(1, 64)                                                      \
2900                                                                             \
2901   product(intx,  AllocatePrefetchStepSize, 16,                              \
2902           "Step size in bytes of sequential prefetch instructions")         \
2903           range(1, 512)                                                     \
2904           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2905                                                                             \
2906   product(intx,  AllocatePrefetchInstr, 0,                                  \
2907           "Select instruction to prefetch ahead of allocation pointer")     \
2908           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2909                                                                             \
2910   /* deoptimization */                                                      \
2911   develop(bool, TraceDeoptimization, false,                                 \
2912           "Trace deoptimization")                                           \
2913                                                                             \
2914   develop(bool, PrintDeoptimizationDetails, false,                          \
2915           "Print more information about deoptimization")                    \
2916                                                                             \
2917   develop(bool, DebugDeoptimization, false,                                 \
2918           "Tracing various information while debugging deoptimization")     \
2919                                                                             \
2920   product(intx, SelfDestructTimer, 0,                                       \
2921           "Will cause VM to terminate after a given time (in minutes) "     \
2922           "(0 means off)")                                                  \
2923           range(0, max_intx)                                                \
2924                                                                             \
2925   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2926           "The maximum number of lines in the stack trace for Java "        \
2927           "exceptions (0 means all)")                                       \
2928           range(0, max_jint/2)                                              \
2929                                                                             \
2930   /* notice: the max range value here is max_jint, not max_intx  */         \
2931   /* because of overflow issue                                   */         \
2932   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2933           "Guarantee a safepoint (at least) every so many milliseconds "    \
2934           "(0 means none)")                                                 \
2935           range(0, max_jint)                                                \
2936                                                                             \
2937   product(intx, SafepointTimeoutDelay, 10000,                               \
2938           "Delay in milliseconds for option SafepointTimeout")              \
2939   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2940   NOT_LP64(range(0, max_intx))                                              \
2941                                                                             \
2942   product(intx, NmethodSweepActivity, 10,                                   \
2943           "Removes cold nmethods from code cache if > 0. Higher values "    \
2944           "result in more aggressive sweeping")                             \
2945           range(0, 2000)                                                    \
2946                                                                             \
2947   notproduct(bool, LogSweeper, false,                                       \
2948           "Keep a ring buffer of sweeper activity")                         \
2949                                                                             \
2950   notproduct(intx, SweeperLogEntries, 1024,                                 \
2951           "Number of records in the ring buffer of sweeper activity")       \
2952                                                                             \
2953   notproduct(intx, MemProfilingInterval, 500,                               \
2954           "Time between each invocation of the MemProfiler")                \
2955                                                                             \
2956   develop(intx, MallocCatchPtr, -1,                                         \
2957           "Hit breakpoint when mallocing/freeing this pointer")             \
2958                                                                             \
2959   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2960           "List of assertions (file:line) to muzzle")                       \
2961                                                                             \
2962   develop(intx, StackPrintLimit, 100,                                       \
2963           "number of stack frames to print in VM-level stack dump")         \
2964                                                                             \
2965   notproduct(intx, MaxElementPrintSize, 256,                                \
2966           "maximum number of elements to print")                            \
2967                                                                             \
2968   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2969           "maximum number of subklasses to print when printing klass")      \
2970                                                                             \
2971   product(intx, MaxInlineLevel, 9,                                          \
2972           "maximum number of nested calls that are inlined")                \
2973           range(0, max_jint)                                                \
2974                                                                             \
2975   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2976           "maximum number of nested recursive calls that are inlined")      \
2977           range(0, max_jint)                                                \
2978                                                                             \
2979   develop(intx, MaxForceInlineLevel, 100,                                   \
2980           "maximum number of nested calls that are forced for inlining "    \
2981           "(using CompileCommand or marked w/ @ForceInline)")               \
2982           range(0, max_jint)                                                \
2983                                                                             \
2984   product_pd(intx, InlineSmallCode,                                         \
2985           "Only inline already compiled methods if their code size is "     \
2986           "less than this")                                                 \
2987           range(0, max_jint)                                                \
2988                                                                             \
2989   product(intx, MaxInlineSize, 35,                                          \
2990           "The maximum bytecode size of a method to be inlined")            \
2991           range(0, max_jint)                                                \
2992                                                                             \
2993   product_pd(intx, FreqInlineSize,                                          \
2994           "The maximum bytecode size of a frequent method to be inlined")   \
2995           range(0, max_jint)                                                \
2996                                                                             \
2997   product(intx, MaxTrivialSize, 6,                                          \
2998           "The maximum bytecode size of a trivial method to be inlined")    \
2999           range(0, max_jint)                                                \
3000                                                                             \
3001   product(intx, MinInliningThreshold, 250,                                  \
3002           "The minimum invocation count a method needs to have to be "      \
3003           "inlined")                                                        \
3004           range(0, max_jint)                                                \
3005                                                                             \
3006   develop(intx, MethodHistogramCutoff, 100,                                 \
3007           "The cutoff value for method invocation histogram (+CountCalls)") \
3008                                                                             \
3009   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
3010           "Number of interpreted methods to show in profile")               \
3011                                                                             \
3012   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
3013           "Number of compiled methods to show in profile")                  \
3014                                                                             \
3015   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
3016           "Number of stub methods to show in profile")                      \
3017                                                                             \
3018   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
3019           "Number of runtime stub nodes to show in profile")                \
3020                                                                             \
3021   product(intx, ProfileIntervalsTicks, 100,                                 \
3022           "Number of ticks between printing of interval profile "           \
3023           "(+ProfileIntervals)")                                            \
3024           range(0, max_intx)                                                \
3025                                                                             \
3026   notproduct(intx, ScavengeALotInterval,     1,                             \
3027           "Interval between which scavenge will occur with +ScavengeALot")  \
3028                                                                             \
3029   notproduct(intx, FullGCALotInterval,     1,                               \
3030           "Interval between which full gc will occur with +FullGCALot")     \
3031                                                                             \
3032   notproduct(intx, FullGCALotStart,     0,                                  \
3033           "For which invocation to start FullGCAlot")                       \
3034                                                                             \
3035   notproduct(intx, FullGCALotDummies,  32*K,                                \
3036           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3037           "to move")                                                        \
3038                                                                             \
3039   develop(intx, DontYieldALotInterval,    10,                               \
3040           "Interval between which yields will be dropped (milliseconds)")   \
3041                                                                             \
3042   develop(intx, ProfilerPCTickThreshold,    15,                             \
3043           "Number of ticks in a PC buckets to be a hotspot")                \
3044                                                                             \
3045   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3046           "Number of exits until DeoptimizeALot kicks in")                  \
3047                                                                             \
3048   notproduct(intx, ZombieALotInterval,     5,                               \
3049           "Number of exits until ZombieALot kicks in")                      \
3050                                                                             \
3051   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3052           "If non-zero, maximum number of words that malloc/realloc can "   \
3053           "allocate (for testing only)")                                    \
3054           range(0, max_uintx)                                               \
3055                                                                             \
3056   product(intx, TypeProfileWidth, 2,                                        \
3057           "Number of receiver types to record in call/cast profile")        \
3058           range(0, 8)                                                       \
3059                                                                             \
3060   develop(intx, BciProfileWidth,      2,                                    \
3061           "Number of return bci's to record in ret profile")                \
3062                                                                             \
3063   product(intx, PerMethodRecompilationCutoff, 400,                          \
3064           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3065           range(-1, max_intx)                                               \
3066                                                                             \
3067   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3068           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3069           range(-1, max_intx)                                               \
3070                                                                             \
3071   product(intx, PerMethodTrapLimit,  100,                                   \
3072           "Limit on traps (of one kind) in a method (includes inlines)")    \
3073           range(0, max_jint)                                                \
3074                                                                             \
3075   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3076           "Limit on speculative traps (of one kind) in a method "           \
3077           "(includes inlines)")                                             \
3078           range(0, max_jint)                                                \
3079                                                                             \
3080   product(intx, PerBytecodeTrapLimit,  4,                                   \
3081           "Limit on traps (of one kind) at a particular BCI")               \
3082           range(0, max_jint)                                                \
3083                                                                             \
3084   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3085           "Extra method data trap entries for speculation")                 \
3086                                                                             \
3087   develop(intx, InlineFrequencyRatio,    20,                                \
3088           "Ratio of call site execution to caller method invocation")       \
3089           range(0, max_jint)                                                \
3090                                                                             \
3091   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3092           "Count of call site execution necessary to trigger frequent "     \
3093           "inlining")                                                       \
3094           range(0, max_jint)                                                \
3095                                                                             \
3096   develop(intx, InlineThrowCount,    50,                                    \
3097           "Force inlining of interpreted methods that throw this often")    \
3098           range(0, max_jint)                                                \
3099                                                                             \
3100   develop(intx, InlineThrowMaxSize,   200,                                  \
3101           "Force inlining of throwing methods smaller than this")           \
3102           range(0, max_jint)                                                \
3103                                                                             \
3104   develop(intx, ProfilerNodeSize,  1024,                                    \
3105           "Size in K to allocate for the Profile Nodes of each thread")     \
3106           range(0, 1024)                                                    \
3107                                                                             \
3108   /* gc parameters */                                                       \
3109   product(size_t, InitialHeapSize, 0,                                       \
3110           "Initial heap size (in bytes); zero means use ergonomics")        \
3111           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3112                                                                             \
3113   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3114           "Maximum heap size (in bytes)")                                   \
3115           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3116                                                                             \
3117   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3118           "Initial tenured generation size (in bytes)")                     \
3119           range(0, max_uintx)                                               \
3120                                                                             \
3121   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3122           "Initial new generation size (in bytes)")                         \
3123           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3124                                                                             \
3125   product(size_t, MaxNewSize, max_uintx,                                    \
3126           "Maximum new generation size (in bytes), max_uintx means set "    \
3127           "ergonomically")                                                  \
3128           range(0, max_uintx)                                               \
3129                                                                             \
3130   product_pd(size_t, HeapBaseMinAddress,                                    \
3131           "OS specific low limit for heap base address")                    \
3132           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3133                                                                             \
3134   product(size_t, PretenureSizeThreshold, 0,                                \
3135           "Maximum size in bytes of objects allocated in DefNew "           \
3136           "generation; zero means no maximum")                              \
3137           range(0, max_uintx)                                               \
3138                                                                             \
3139   product(size_t, MinTLABSize, 2*K,                                         \
3140           "Minimum allowed TLAB size (in bytes)")                           \
3141           range(1, max_uintx/2)                                             \
3142           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3143                                                                             \
3144   product(size_t, TLABSize, 0,                                              \
3145           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3146           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3147                                                                             \
3148   product(size_t, YoungPLABSize, 4096,                                      \
3149           "Size of young gen promotion LAB's (in HeapWords)")               \
3150           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3151                                                                             \
3152   product(size_t, OldPLABSize, 1024,                                        \
3153           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3154           "of blocks to attempt to claim when refilling CMS LAB's")         \
3155           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3156                                                                             \
3157   product(uintx, TLABAllocationWeight, 35,                                  \
3158           "Allocation averaging weight")                                    \
3159           range(0, 100)                                                     \
3160                                                                             \
3161   /* Limit the lower bound of this flag to 1 as it is used  */              \
3162   /* in a division expression.                              */              \
3163   product(uintx, TLABWasteTargetPercent, 1,                                 \
3164           "Percentage of Eden that can be wasted")                          \
3165           range(1, 100)                                                     \
3166                                                                             \
3167   product(uintx, TLABRefillWasteFraction,    64,                            \
3168           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3169           range(1, max_juint)                                               \
3170                                                                             \
3171   product(uintx, TLABWasteIncrement,    4,                                  \
3172           "Increment allowed waste at slow allocation")                     \
3173           range(0, max_jint)                                                \
3174           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3175                                                                             \
3176   product(uintx, SurvivorRatio, 8,                                          \
3177           "Ratio of eden/survivor space size")                              \
3178           range(1, max_uintx-2)                                             \
3179           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3180                                                                             \
3181   product(uintx, NewRatio, 2,                                               \
3182           "Ratio of old/new generation sizes")                              \
3183           range(0, max_uintx-1)                                             \
3184                                                                             \
3185   product_pd(size_t, NewSizeThreadIncrease,                                 \
3186           "Additional size added to desired new generation size per "       \
3187           "non-daemon thread (in bytes)")                                   \
3188           range(0, max_uintx)                                               \
3189                                                                             \
3190   product_pd(size_t, MetaspaceSize,                                         \
3191           "Initial threshold (in bytes) at which a garbage collection "     \
3192           "is done to reduce Metaspace usage")                              \
3193           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3194                                                                             \
3195   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3196           "Maximum size of Metaspaces (in bytes)")                          \
3197           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3198                                                                             \
3199   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3200           "Maximum size of class area in Metaspace when compressed "        \
3201           "class pointers are used")                                        \
3202           range(1*M, 3*G)                                                   \
3203                                                                             \
3204   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3205           "The minimum percentage of heap free after GC to avoid expansion."\
3206           " For most GCs this applies to the old generation. In G1 and"     \
3207           " ParallelGC it applies to the whole heap.")                      \
3208           range(0, 100)                                                     \
3209           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3210                                                                             \
3211   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3212           "The maximum percentage of heap free after GC to avoid shrinking."\
3213           " For most GCs this applies to the old generation. In G1 and"     \
3214           " ParallelGC it applies to the whole heap.")                      \
3215           range(0, 100)                                                     \
3216           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3217                                                                             \
3218   product(bool, ShrinkHeapInSteps, true,                                    \
3219           "When disabled, informs the GC to shrink the java heap directly"  \
3220           " to the target size at the next full GC rather than requiring"   \
3221           " smaller steps during multiple full GCs.")                       \
3222                                                                             \
3223   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3224           "Number of milliseconds per MB of free space in the heap")        \
3225           range(0, max_intx)                                                \
3226           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3227                                                                             \
3228   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3229           "The minimum change in heap space due to GC (in bytes)")          \
3230           range(0, max_uintx)                                               \
3231                                                                             \
3232   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3233           "The minimum expansion of Metaspace (in bytes)")                  \
3234           range(0, max_uintx)                                               \
3235                                                                             \
3236   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3237           "The maximum percentage of Metaspace free after GC to avoid "     \
3238           "shrinking")                                                      \
3239           range(0, 100)                                                     \
3240           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3241                                                                             \
3242   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3243           "The minimum percentage of Metaspace free after GC to avoid "     \
3244           "expansion")                                                      \
3245           range(0, 99)                                                      \
3246           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3247                                                                             \
3248   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3249           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3250           range(0, max_uintx)                                               \
3251                                                                             \
3252   product(uintx, QueuedAllocationWarningCount, 0,                           \
3253           "Number of times an allocation that queues behind a GC "          \
3254           "will retry before printing a warning")                           \
3255           range(0, max_uintx)                                               \
3256                                                                             \
3257   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3258           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3259           range(0, max_uintx)                                               \
3260                                                                             \
3261   diagnostic(intx, VerifyGCLevel,     0,                                    \
3262           "Generation level at which to start +VerifyBefore/AfterGC")       \
3263           range(0, 1)                                                       \
3264                                                                             \
3265   product(uintx, MaxTenuringThreshold,    15,                               \
3266           "Maximum value for tenuring threshold")                           \
3267           range(0, markOopDesc::max_age + 1)                                \
3268           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3269                                                                             \
3270   product(uintx, InitialTenuringThreshold,    7,                            \
3271           "Initial value for tenuring threshold")                           \
3272           range(0, markOopDesc::max_age + 1)                                \
3273           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3274                                                                             \
3275   product(uintx, TargetSurvivorRatio,    50,                                \
3276           "Desired percentage of survivor space used after scavenge")       \
3277           range(0, 100)                                                     \
3278                                                                             \
3279   product(uintx, MarkSweepDeadRatio,     5,                                 \
3280           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3281           "Serial mark sweep treats this as both the minimum and maximum "  \
3282           "value. "                                                         \
3283           "CMS uses this value only if it falls back to mark sweep. "       \
3284           "Par compact uses a variable scale based on the density of the "  \
3285           "generation and treats this as the maximum value when the heap "  \
3286           "is either completely full or completely empty.  Par compact "    \
3287           "also has a smaller default value; see arguments.cpp.")           \
3288           range(0, 100)                                                     \
3289                                                                             \
3290   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3291           "How often should we fully compact the heap (ignoring the dead "  \
3292           "space parameters)")                                              \
3293           range(1, max_juint)                                               \
3294                                                                             \
3295   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3296           "Delay between expansion and allocation (in milliseconds)")       \
3297                                                                             \
3298   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3299           "Delay in scheduling GC workers (in milliseconds)")               \
3300                                                                             \
3301   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3302           "(Unstable, Deprecated) "                                         \
3303           "Number of times to iterate in safepoint loop "                   \
3304           "before blocking VM threads ")                                    \
3305           range(-1, max_jint-1)                                             \
3306                                                                             \
3307   product(intx, DeferPollingPageLoopCount,     -1,                          \
3308           "(Unsafe,Unstable,Deprecated) "                                   \
3309           "Number of iterations in safepoint loop "                         \
3310           "before changing safepoint polling page to RO ")                  \
3311           range(-1, max_jint-1)                                             \
3312                                                                             \
3313   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable, Deprecated)")   \
3314           range(0, max_intx)                                                \
3315                                                                             \
3316   product(bool, PSChunkLargeArrays, true,                                   \
3317           "Process large arrays in chunks")                                 \
3318                                                                             \
3319   product(uintx, GCDrainStackTargetSize, 64,                                \
3320           "Number of entries we will try to leave on the stack "            \
3321           "during parallel gc")                                             \
3322           range(0, max_juint)                                               \
3323                                                                             \
3324   /* stack parameters */                                                    \
3325   product_pd(intx, StackYellowPages,                                        \
3326           "Number of yellow zone (recoverable overflows) pages of size "    \
3327           "4KB. If pages are bigger yellow zone is aligned up.")            \
3328           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3329                                                                             \
3330   product_pd(intx, StackRedPages,                                           \
3331           "Number of red zone (unrecoverable overflows) pages of size "     \
3332           "4KB. If pages are bigger red zone is aligned up.")               \
3333           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3334                                                                             \
3335   product_pd(intx, StackReservedPages,                                      \
3336           "Number of reserved zone (reserved to annotated methods) pages"   \
3337           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3338           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3339                                                                             \
3340   product(bool, RestrictReservedStack, true,                                \
3341           "Restrict @ReservedStackAccess to trusted classes")               \
3342                                                                             \
3343   /* greater stack shadow pages can't generate instruction to bang stack */ \
3344   product_pd(intx, StackShadowPages,                                        \
3345           "Number of shadow zone (for overflow checking) pages of size "    \
3346           "4KB. If pages are bigger shadow zone is aligned up. "            \
3347           "This should exceed the depth of the VM and native call stack.")  \
3348           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3349                                                                             \
3350   product_pd(intx, ThreadStackSize,                                         \
3351           "Thread Stack Size (in Kbytes)")                                  \
3352           range(0, 1 * M)                                                   \
3353                                                                             \
3354   product_pd(intx, VMThreadStackSize,                                       \
3355           "Non-Java Thread Stack Size (in Kbytes)")                         \
3356           range(0, max_intx/(1 * K))                                        \
3357                                                                             \
3358   product_pd(intx, CompilerThreadStackSize,                                 \
3359           "Compiler Thread Stack Size (in Kbytes)")                         \
3360           range(0, max_intx/(1 * K))                                        \
3361                                                                             \
3362   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3363           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3364                                                                             \
3365   /* code cache parameters                                    */            \
3366   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3367           "Code cache segment size (in bytes) - smallest unit of "          \
3368           "allocation")                                                     \
3369           range(1, 1024)                                                    \
3370           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3371                                                                             \
3372   develop_pd(intx, CodeEntryAlignment,                                      \
3373           "Code entry alignment for generated code (in bytes)")             \
3374           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3375                                                                             \
3376   product_pd(intx, OptoLoopAlignment,                                       \
3377           "Align inner loops to zero relative to this modulus")             \
3378           range(1, 16)                                                      \
3379           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3380                                                                             \
3381   product_pd(uintx, InitialCodeCacheSize,                                   \
3382           "Initial code cache size (in bytes)")                             \
3383           range(0, max_uintx)                                               \
3384                                                                             \
3385   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3386           "Minimum code cache size (in bytes) required to start VM.")       \
3387           range(0, max_uintx)                                               \
3388                                                                             \
3389   product(bool, SegmentedCodeCache, false,                                  \
3390           "Use a segmented code cache")                                     \
3391                                                                             \
3392   product_pd(uintx, ReservedCodeCacheSize,                                  \
3393           "Reserved code cache size (in bytes) - maximum code cache size")  \
3394           range(0, max_uintx)                                               \
3395                                                                             \
3396   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3397           "Size of code heap with non-profiled methods (in bytes)")         \
3398           range(0, max_uintx)                                               \
3399                                                                             \
3400   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3401           "Size of code heap with profiled methods (in bytes)")             \
3402           range(0, max_uintx)                                               \
3403                                                                             \
3404   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3405           "Size of code heap with non-nmethods (in bytes)")                 \
3406           range(0, max_uintx)                                               \
3407                                                                             \
3408   product_pd(uintx, CodeCacheExpansionSize,                                 \
3409           "Code cache expansion size (in bytes)")                           \
3410           range(0, max_uintx)                                               \
3411                                                                             \
3412   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3413           "Minimum number of segments in a code cache block")               \
3414           range(1, 100)                                                     \
3415                                                                             \
3416   notproduct(bool, ExitOnFullCodeCache, false,                              \
3417           "Exit the VM if we fill the code cache")                          \
3418                                                                             \
3419   product(bool, UseCodeCacheFlushing, true,                                 \
3420           "Remove cold/old nmethods from the code cache")                   \
3421                                                                             \
3422   product(uintx, StartAggressiveSweepingAt, 10,                             \
3423           "Start aggressive sweeping if X[%] of the code cache is free."    \
3424           "Segmented code cache: X[%] of the non-profiled heap."            \
3425           "Non-segmented code cache: X[%] of the total code cache")         \
3426           range(0, 100)                                                     \
3427                                                                             \
3428   /* AOT parameters */                                                      \
3429   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3430           "Use AOT compiled files")                                         \
3431                                                                             \
3432   product(ccstrlist, AOTLibrary, NULL,                                      \
3433           "AOT library")                                                    \
3434                                                                             \
3435   product(bool, PrintAOT, false,                                            \
3436           "Print used AOT klasses and methods")                             \
3437                                                                             \
3438   notproduct(bool, PrintAOTStatistics, false,                               \
3439           "Print AOT statistics")                                           \
3440                                                                             \
3441   diagnostic(bool, UseAOTStrictLoading, false,                              \
3442           "Exit the VM if any of the AOT libraries has invalid config")     \
3443                                                                             \
3444   product(bool, CalculateClassFingerprint, false,                           \
3445           "Calculate class fingerprint")                                    \
3446                                                                             \
3447   /* interpreter debugging */                                               \
3448   develop(intx, BinarySwitchThreshold, 5,                                   \
3449           "Minimal number of lookupswitch entries for rewriting to binary " \
3450           "switch")                                                         \
3451                                                                             \
3452   develop(intx, StopInterpreterAt, 0,                                       \
3453           "Stop interpreter execution at specified bytecode number")        \
3454                                                                             \
3455   develop(intx, TraceBytecodesAt, 0,                                        \
3456           "Trace bytecodes starting with specified bytecode number")        \
3457                                                                             \
3458   /* compiler interface */                                                  \
3459   develop(intx, CIStart, 0,                                                 \
3460           "The id of the first compilation to permit")                      \
3461                                                                             \
3462   develop(intx, CIStop, max_jint,                                           \
3463           "The id of the last compilation to permit")                       \
3464                                                                             \
3465   develop(intx, CIStartOSR, 0,                                              \
3466           "The id of the first osr compilation to permit "                  \
3467           "(CICountOSR must be on)")                                        \
3468                                                                             \
3469   develop(intx, CIStopOSR, max_jint,                                        \
3470           "The id of the last osr compilation to permit "                   \
3471           "(CICountOSR must be on)")                                        \
3472                                                                             \
3473   develop(intx, CIBreakAtOSR, -1,                                           \
3474           "The id of osr compilation to break at")                          \
3475                                                                             \
3476   develop(intx, CIBreakAt, -1,                                              \
3477           "The id of compilation to break at")                              \
3478                                                                             \
3479   product(ccstrlist, CompileOnly, "",                                       \
3480           "List of methods (pkg/class.name) to restrict compilation to")    \
3481                                                                             \
3482   product(ccstr, CompileCommandFile, NULL,                                  \
3483           "Read compiler commands from this file [.hotspot_compiler]")      \
3484                                                                             \
3485   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3486           "Read compiler directives from this file")                        \
3487                                                                             \
3488   product(ccstrlist, CompileCommand, "",                                    \
3489           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3490                                                                             \
3491   develop(bool, ReplayCompiles, false,                                      \
3492           "Enable replay of compilations from ReplayDataFile")              \
3493                                                                             \
3494   product(ccstr, ReplayDataFile, NULL,                                      \
3495           "File containing compilation replay information"                  \
3496           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3497                                                                             \
3498    product(ccstr, InlineDataFile, NULL,                                     \
3499           "File containing inlining replay information"                     \
3500           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3501                                                                             \
3502   develop(intx, ReplaySuppressInitializers, 2,                              \
3503           "Control handling of class initialization during replay: "        \
3504           "0 - don't do anything special; "                                 \
3505           "1 - treat all class initializers as empty; "                     \
3506           "2 - treat class initializers for application classes as empty; " \
3507           "3 - allow all class initializers to run during bootstrap but "   \
3508           "    pretend they are empty after starting replay")               \
3509           range(0, 3)                                                       \
3510                                                                             \
3511   develop(bool, ReplayIgnoreInitErrors, false,                              \
3512           "Ignore exceptions thrown during initialization for replay")      \
3513                                                                             \
3514   product(bool, DumpReplayDataOnError, true,                                \
3515           "Record replay data for crashing compiler threads")               \
3516                                                                             \
3517   product(bool, CICompilerCountPerCPU, false,                               \
3518           "1 compiler thread for log(N CPUs)")                              \
3519                                                                             \
3520   develop(intx, CIFireOOMAt,    -1,                                         \
3521           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3522           "(non-negative value throws OOM after this many CI accesses "     \
3523           "in each compile)")                                               \
3524   notproduct(intx, CICrashAt, -1,                                           \
3525           "id of compilation to trigger assert in compiler thread for "     \
3526           "the purpose of testing, e.g. generation of replay data")         \
3527   notproduct(bool, CIObjectFactoryVerify, false,                            \
3528           "enable potentially expensive verification in ciObjectFactory")   \
3529                                                                             \
3530   /* Priorities */                                                          \
3531   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3532                                                                             \
3533   product(intx, ThreadPriorityPolicy, 0,                                    \
3534           "0 : Normal.                                                     "\
3535           "    VM chooses priorities that are appropriate for normal       "\
3536           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3537           "    to normal native priority. Java priorities below "           \
3538           "    NORM_PRIORITY map to lower native priority values. On       "\
3539           "    Windows applications are allowed to use higher native       "\
3540           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3541           "    not use the highest possible native priority,               "\
3542           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3543           "    system threads. On Linux thread priorities are ignored      "\
3544           "    because the OS does not support static priority in          "\
3545           "    SCHED_OTHER scheduling class which is the only choice for   "\
3546           "    non-root, non-realtime applications.                        "\
3547           "1 : Aggressive.                                                 "\
3548           "    Java thread priorities map over to the entire range of      "\
3549           "    native thread priorities. Higher Java thread priorities map "\
3550           "    to higher native thread priorities. This policy should be   "\
3551           "    used with care, as sometimes it can cause performance       "\
3552           "    degradation in the application and/or the entire system. On "\
3553           "    Linux this policy requires root privilege.")                 \
3554           range(0, 1)                                                       \
3555                                                                             \
3556   product(bool, ThreadPriorityVerbose, false,                               \
3557           "Print priority changes")                                         \
3558                                                                             \
3559   product(intx, CompilerThreadPriority, -1,                                 \
3560           "The native priority at which compiler threads should run "       \
3561           "(-1 means no change)")                                           \
3562           range(min_jint, max_jint)                                         \
3563           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3564                                                                             \
3565   product(intx, VMThreadPriority, -1,                                       \
3566           "The native priority at which the VM thread should run "          \
3567           "(-1 means no change)")                                           \
3568           range(-1, 127)                                                    \
3569                                                                             \
3570   product(bool, CompilerThreadHintNoPreempt, true,                          \
3571           "(Solaris only) Give compiler threads an extra quanta")           \
3572                                                                             \
3573   product(bool, VMThreadHintNoPreempt, false,                               \
3574           "(Solaris only) Give VM thread an extra quanta")                  \
3575                                                                             \
3576   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3577           "Map Java priorities to OS priorities")                           \
3578           range(-1, 127)                                                    \
3579                                                                             \
3580   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3581           "Map Java priorities to OS priorities")                           \
3582           range(-1, 127)                                                    \
3583                                                                             \
3584   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3585           "Map Java priorities to OS priorities")                           \
3586           range(-1, 127)                                                    \
3587                                                                             \
3588   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3589           "Map Java priorities to OS priorities")                           \
3590           range(-1, 127)                                                    \
3591                                                                             \
3592   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3593           "Map Java priorities to OS priorities")                           \
3594           range(-1, 127)                                                    \
3595                                                                             \
3596   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3597           "Map Java priorities to OS priorities")                           \
3598           range(-1, 127)                                                    \
3599                                                                             \
3600   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3601           "Map Java priorities to OS priorities")                           \
3602           range(-1, 127)                                                    \
3603                                                                             \
3604   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3605           "Map Java priorities to OS priorities")                           \
3606           range(-1, 127)                                                    \
3607                                                                             \
3608   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3609           "Map Java priorities to OS priorities")                           \
3610           range(-1, 127)                                                    \
3611                                                                             \
3612   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3613           "Map Java priorities to OS priorities")                           \
3614           range(-1, 127)                                                    \
3615                                                                             \
3616   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3617           "Java thread priority 10 maps to critical scheduling priority")   \
3618                                                                             \
3619   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3620           "Compiler thread(s) run at critical scheduling priority")         \
3621                                                                             \
3622   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3623           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3624                                                                             \
3625   /* compiler debugging */                                                  \
3626   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3627           "First class to consider when using +CompileTheWorld")            \
3628                                                                             \
3629   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3630           "Last class to consider when using +CompileTheWorld")             \
3631                                                                             \
3632   develop(intx, NewCodeParameter,      0,                                   \
3633           "Testing Only: Create a dedicated integer parameter before "      \
3634           "putback")                                                        \
3635                                                                             \
3636   /* new oopmap storage allocation */                                       \
3637   develop(intx, MinOopMapAllocation,     8,                                 \
3638           "Minimum number of OopMap entries in an OopMapSet")               \
3639                                                                             \
3640   /* Background Compilation */                                              \
3641   develop(intx, LongCompileThreshold,     50,                               \
3642           "Used with +TraceLongCompiles")                                   \
3643                                                                             \
3644   /* recompilation */                                                       \
3645   product_pd(intx, CompileThreshold,                                        \
3646           "number of interpreted method invocations before (re-)compiling") \
3647           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3648                                                                             \
3649   product(double, CompileThresholdScaling, 1.0,                             \
3650           "Factor to control when first compilation happens "               \
3651           "(both with and without tiered compilation): "                    \
3652           "values greater than 1.0 delay counter overflow, "                \
3653           "values between 0 and 1.0 rush counter overflow, "                \
3654           "value of 1.0 leaves compilation thresholds unchanged "           \
3655           "value of 0.0 is equivalent to -Xint. "                           \
3656           ""                                                                \
3657           "Flag can be set as per-method option. "                          \
3658           "If a value is specified for a method, compilation thresholds "   \
3659           "for that method are scaled by both the value of the global flag "\
3660           "and the value of the per-method flag.")                          \
3661           range(0.0, DBL_MAX)                                               \
3662                                                                             \
3663   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3664           "Interpreter (tier 0) invocation notification frequency")         \
3665           range(0, 30)                                                      \
3666                                                                             \
3667   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3668           "C1 without MDO (tier 2) invocation notification frequency")      \
3669           range(0, 30)                                                      \
3670                                                                             \
3671   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3672           "C1 with MDO profiling (tier 3) invocation notification "         \
3673           "frequency")                                                      \
3674           range(0, 30)                                                      \
3675                                                                             \
3676   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3677           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3678           range(0, 30)                                                      \
3679                                                                             \
3680   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3681           "Interpreter (tier 0) invocation notification frequency")         \
3682           range(0, 30)                                                      \
3683                                                                             \
3684   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3685           "C1 without MDO (tier 2) invocation notification frequency")      \
3686           range(0, 30)                                                      \
3687                                                                             \
3688   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3689           "C1 with MDO profiling (tier 3) invocation notification "         \
3690           "frequency")                                                      \
3691           range(0, 30)                                                      \
3692                                                                             \
3693   product(intx, Tier2CompileThreshold, 0,                                   \
3694           "threshold at which tier 2 compilation is invoked")               \
3695           range(0, max_jint)                                                \
3696                                                                             \
3697   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3698           "Back edge threshold at which tier 2 compilation is invoked")     \
3699           range(0, max_jint)                                                \
3700                                                                             \
3701   product(intx, Tier3InvocationThreshold, 200,                              \
3702           "Compile if number of method invocations crosses this "           \
3703           "threshold")                                                      \
3704           range(0, max_jint)                                                \
3705                                                                             \
3706   product(intx, Tier3MinInvocationThreshold, 100,                           \
3707           "Minimum invocation to compile at tier 3")                        \
3708           range(0, max_jint)                                                \
3709                                                                             \
3710   product(intx, Tier3CompileThreshold, 2000,                                \
3711           "Threshold at which tier 3 compilation is invoked (invocation "   \
3712           "minimum must be satisfied)")                                     \
3713           range(0, max_jint)                                                \
3714                                                                             \
3715   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3716           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3717           range(0, max_jint)                                                \
3718                                                                             \
3719   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3720           "Compile if number of method invocations crosses this "           \
3721           "threshold if coming from AOT")                                   \
3722           range(0, max_jint)                                                \
3723                                                                             \
3724   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3725           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3726           range(0, max_jint)                                                \
3727                                                                             \
3728   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3729           "Threshold at which tier 3 compilation is invoked (invocation "   \
3730           "minimum must be satisfied) if coming from AOT")                  \
3731           range(0, max_jint)                                                \
3732                                                                             \
3733   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3734           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3735           "if coming from AOT")                                             \
3736           range(0, max_jint)                                                \
3737                                                                             \
3738   product(intx, Tier4InvocationThreshold, 5000,                             \
3739           "Compile if number of method invocations crosses this "           \
3740           "threshold")                                                      \
3741           range(0, max_jint)                                                \
3742                                                                             \
3743   product(intx, Tier4MinInvocationThreshold, 600,                           \
3744           "Minimum invocation to compile at tier 4")                        \
3745           range(0, max_jint)                                                \
3746                                                                             \
3747   product(intx, Tier4CompileThreshold, 15000,                               \
3748           "Threshold at which tier 4 compilation is invoked (invocation "   \
3749           "minimum must be satisfied")                                      \
3750           range(0, max_jint)                                                \
3751                                                                             \
3752   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3753           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3754           range(0, max_jint)                                                \
3755                                                                             \
3756   product(intx, Tier3DelayOn, 5,                                            \
3757           "If C2 queue size grows over this amount per compiler thread "    \
3758           "stop compiling at tier 3 and start compiling at tier 2")         \
3759           range(0, max_jint)                                                \
3760                                                                             \
3761   product(intx, Tier3DelayOff, 2,                                           \
3762           "If C2 queue size is less than this amount per compiler thread "  \
3763           "allow methods compiled at tier 2 transition to tier 3")          \
3764           range(0, max_jint)                                                \
3765                                                                             \
3766   product(intx, Tier3LoadFeedback, 5,                                       \
3767           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3768           "reaches this amount per compiler thread")                        \
3769           range(0, max_jint)                                                \
3770                                                                             \
3771   product(intx, Tier4LoadFeedback, 3,                                       \
3772           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3773           "reaches this amount per compiler thread")                        \
3774           range(0, max_jint)                                                \
3775                                                                             \
3776   product(intx, TieredCompileTaskTimeout, 50,                               \
3777           "Kill compile task if method was not used within "                \
3778           "given timeout in milliseconds")                                  \
3779           range(0, max_intx)                                                \
3780                                                                             \
3781   product(intx, TieredStopAtLevel, 4,                                       \
3782           "Stop at given compilation level")                                \
3783           range(0, 4)                                                       \
3784                                                                             \
3785   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3786           "Start profiling in interpreter if the counters exceed tier 3 "   \
3787           "thresholds by the specified percentage")                         \
3788           range(0, max_jint)                                                \
3789                                                                             \
3790   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3791           "Increase the compile threshold for C1 compilation if the code "  \
3792           "cache is filled by the specified percentage")                    \
3793           range(0, 99)                                                      \
3794                                                                             \
3795   product(intx, TieredRateUpdateMinTime, 1,                                 \
3796           "Minimum rate sampling interval (in milliseconds)")               \
3797           range(0, max_intx)                                                \
3798                                                                             \
3799   product(intx, TieredRateUpdateMaxTime, 25,                                \
3800           "Maximum rate sampling interval (in milliseconds)")               \
3801           range(0, max_intx)                                                \
3802                                                                             \
3803   product_pd(bool, TieredCompilation,                                       \
3804           "Enable tiered compilation")                                      \
3805                                                                             \
3806   product(bool, PrintTieredEvents, false,                                   \
3807           "Print tiered events notifications")                              \
3808                                                                             \
3809   product_pd(intx, OnStackReplacePercentage,                                \
3810           "NON_TIERED number of method invocations/branches (expressed as " \
3811           "% of CompileThreshold) before (re-)compiling OSR code")          \
3812           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3813                                                                             \
3814   product(intx, InterpreterProfilePercentage, 33,                           \
3815           "NON_TIERED number of method invocations/branches (expressed as " \
3816           "% of CompileThreshold) before profiling in the interpreter")     \
3817           range(0, 100)                                                     \
3818                                                                             \
3819   develop(intx, MaxRecompilationSearchLength,    10,                        \
3820           "The maximum number of frames to inspect when searching for "     \
3821           "recompilee")                                                     \
3822                                                                             \
3823   develop(intx, MaxInterpretedSearchLength,     3,                          \
3824           "The maximum number of interpreted frames to skip when searching "\
3825           "for recompilee")                                                 \
3826                                                                             \
3827   develop(intx, DesiredMethodLimit,  8000,                                  \
3828           "The desired maximum method size (in bytecodes) after inlining")  \
3829                                                                             \
3830   develop(intx, HugeMethodLimit,  8000,                                     \
3831           "Don't compile methods larger than this if "                      \
3832           "+DontCompileHugeMethods")                                        \
3833                                                                             \
3834   /* New JDK 1.4 reflection implementation */                               \
3835                                                                             \
3836   develop(intx, FastSuperclassLimit, 8,                                     \
3837           "Depth of hardwired instanceof accelerator array")                \
3838                                                                             \
3839   /* Properties for Java libraries  */                                      \
3840                                                                             \
3841   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3842           "Maximum total size of NIO direct-buffer allocations")            \
3843           range(0, max_jlong)                                               \
3844                                                                             \
3845   /* Flags used for temporary code during development  */                   \
3846                                                                             \
3847   diagnostic(bool, UseNewCode, false,                                       \
3848           "Testing Only: Use the new version while testing")                \
3849                                                                             \
3850   diagnostic(bool, UseNewCode2, false,                                      \
3851           "Testing Only: Use the new version while testing")                \
3852                                                                             \
3853   diagnostic(bool, UseNewCode3, false,                                      \
3854           "Testing Only: Use the new version while testing")                \
3855                                                                             \
3856   /* flags for performance data collection */                               \
3857                                                                             \
3858   product(bool, UsePerfData, true,                                          \
3859           "Flag to disable jvmstat instrumentation for performance testing "\
3860           "and problem isolation purposes")                                 \
3861                                                                             \
3862   product(bool, PerfDataSaveToFile, false,                                  \
3863           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3864                                                                             \
3865   product(ccstr, PerfDataSaveFile, NULL,                                    \
3866           "Save PerfData memory to the specified absolute pathname. "       \
3867           "The string %p in the file name (if present) "                    \
3868           "will be replaced by pid")                                        \
3869                                                                             \
3870   product(intx, PerfDataSamplingInterval, 50,                               \
3871           "Data sampling interval (in milliseconds)")                       \
3872           range(PeriodicTask::min_interval, max_jint)                       \
3873           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3874                                                                             \
3875   product(bool, PerfDisableSharedMem, false,                                \
3876           "Store performance data in standard memory")                      \
3877                                                                             \
3878   product(intx, PerfDataMemorySize, 32*K,                                   \
3879           "Size of performance data memory region. Will be rounded "        \
3880           "up to a multiple of the native os page size.")                   \
3881           range(128, 32*64*K)                                               \
3882                                                                             \
3883   product(intx, PerfMaxStringConstLength, 1024,                             \
3884           "Maximum PerfStringConstant string length before truncation")     \
3885           range(32, 32*K)                                                   \
3886                                                                             \
3887   product(bool, PerfAllowAtExitRegistration, false,                         \
3888           "Allow registration of atexit() methods")                         \
3889                                                                             \
3890   product(bool, PerfBypassFileSystemCheck, false,                           \
3891           "Bypass Win32 file system criteria checks (Windows Only)")        \
3892                                                                             \
3893   product(intx, UnguardOnExecutionViolation, 0,                             \
3894           "Unguard page and retry on no-execute fault (Win32 only) "        \
3895           "0=off, 1=conservative, 2=aggressive")                            \
3896           range(0, 2)                                                       \
3897                                                                             \
3898   /* Serviceability Support */                                              \
3899                                                                             \
3900   product(bool, ManagementServer, false,                                    \
3901           "Create JMX Management Server")                                   \
3902                                                                             \
3903   product(bool, DisableAttachMechanism, false,                              \
3904           "Disable mechanism that allows tools to attach to this VM")       \
3905                                                                             \
3906   product(bool, StartAttachListener, false,                                 \
3907           "Always start Attach Listener at VM startup")                     \
3908                                                                             \
3909   product(bool, EnableDynamicAgentLoading, true,                            \
3910           "Allow tools to load agents with the attach mechanism")           \
3911                                                                             \
3912   manageable(bool, PrintConcurrentLocks, false,                             \
3913           "Print java.util.concurrent locks in thread dump")                \
3914                                                                             \
3915   product(bool, TransmitErrorReport, false,                                 \
3916           "Enable error report transmission on erroneous termination")      \
3917                                                                             \
3918   product(ccstr, ErrorReportServer, NULL,                                   \
3919           "Override built-in error report server address")                  \
3920                                                                             \
3921   /* Shared spaces */                                                       \
3922                                                                             \
3923   product(bool, UseSharedSpaces, true,                                      \
3924           "Use shared spaces for metadata")                                 \
3925                                                                             \
3926   product(bool, VerifySharedSpaces, false,                                  \
3927           "Verify shared spaces (false for default archive, true for "      \
3928           "archive specified by -XX:SharedArchiveFile)")                    \
3929                                                                             \
3930   product(bool, RequireSharedSpaces, false,                                 \
3931           "Require shared spaces for metadata")                             \
3932                                                                             \
3933   product(bool, DumpSharedSpaces, false,                                    \
3934           "Special mode: JVM reads a class list, loads classes, builds "    \
3935           "shared spaces, and dumps the shared spaces to a file to be "     \
3936           "used in future JVM runs")                                        \
3937                                                                             \
3938   product(bool, PrintSharedArchiveAndExit, false,                           \
3939           "Print shared archive file contents")                             \
3940                                                                             \
3941   product(bool, PrintSharedDictionary, false,                               \
3942           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3943           "dictionary")                                                     \
3944                                                                             \
3945   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3946           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3947           "Address to allocate shared memory region for class data")        \
3948           range(0, SIZE_MAX)                                                \
3949                                                                             \
3950   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3951           "Average number of symbols per bucket in shared table")           \
3952           range(2, 246)                                                     \
3953                                                                             \
3954   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true,              \
3955           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3956           "classes. Just exclude them from the shared dictionary.")         \
3957                                                                             \
3958   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3959           "Print generated stub code for method handles")                   \
3960                                                                             \
3961   develop(bool, TraceMethodHandles, false,                                  \
3962           "trace internal method handle operations")                        \
3963                                                                             \
3964   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3965           "perform extra checks when constructing method handles")          \
3966                                                                             \
3967   diagnostic(bool, ShowHiddenFrames, false,                                 \
3968           "show method handle implementation frames (usually hidden)")      \
3969                                                                             \
3970   experimental(bool, TrustFinalNonStaticFields, false,                      \
3971           "trust final non-static declarations for constant folding")       \
3972                                                                             \
3973   diagnostic(bool, FoldStableValues, true,                                  \
3974           "Optimize loads from stable fields (marked w/ @Stable)")          \
3975                                                                             \
3976   develop(bool, TraceInvokeDynamic, false,                                  \
3977           "trace internal invoke dynamic operations")                       \
3978                                                                             \
3979   diagnostic(bool, PauseAtStartup,      false,                              \
3980           "Causes the VM to pause at startup time and wait for the pause "  \
3981           "file to be removed (default: ./vm.paused.<pid>)")                \
3982                                                                             \
3983   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3984           "The file to create and for whose removal to await when pausing " \
3985           "at startup. (default: ./vm.paused.<pid>)")                       \
3986                                                                             \
3987   diagnostic(bool, PauseAtExit, false,                                      \
3988           "Pause and wait for keypress on exit if a debugger is attached")  \
3989                                                                             \
3990   product(bool, ExtendedDTraceProbes,    false,                             \
3991           "Enable performance-impacting dtrace probes")                     \
3992                                                                             \
3993   product(bool, DTraceMethodProbes, false,                                  \
3994           "Enable dtrace probes for method-entry and method-exit")          \
3995                                                                             \
3996   product(bool, DTraceAllocProbes, false,                                   \
3997           "Enable dtrace probes for object allocation")                     \
3998                                                                             \
3999   product(bool, DTraceMonitorProbes, false,                                 \
4000           "Enable dtrace probes for monitor events")                        \
4001                                                                             \
4002   product(bool, RelaxAccessControlCheck, false,                             \
4003           "Relax the access control checks in the verifier")                \
4004                                                                             \
4005   product(uintx, StringTableSize, defaultStringTableSize,                   \
4006           "Number of buckets in the interned String table")                 \
4007           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4008                                                                             \
4009   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4010           "Number of buckets in the JVM internal Symbol table")             \
4011           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4012                                                                             \
4013   product(bool, UseStringDeduplication, false,                              \
4014           "Use string deduplication")                                       \
4015                                                                             \
4016   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4017           "A string must reach this age (or be promoted to an old region) " \
4018           "to be considered for deduplication")                             \
4019           range(1, markOopDesc::max_age)                                    \
4020                                                                             \
4021   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4022           "Force table resize every time the table is scanned")             \
4023                                                                             \
4024   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4025           "Force table rehash every time the table is scanned")             \
4026                                                                             \
4027   diagnostic(bool, WhiteBoxAPI, false,                                      \
4028           "Enable internal testing APIs")                                   \
4029                                                                             \
4030   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4031            "Default survivor space alignment in bytes")                     \
4032            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4033                                                                             \
4034   product(bool , AllowNonVirtualCalls, false,                               \
4035           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4036                                                                             \
4037   product(ccstr, DumpLoadedClassList, NULL,                                 \
4038           "Dump the names all loaded classes, that could be stored into "   \
4039           "the CDS archive, in the specified file")                         \
4040                                                                             \
4041   product(ccstr, SharedClassListFile, NULL,                                 \
4042           "Override the default CDS class list")                            \
4043                                                                             \
4044   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4045           "Override the default location of the CDS archive file")          \
4046                                                                             \
4047   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4048           "Extra classlist for building the CDS archive file")              \
4049                                                                             \
4050   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4051           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4052           "Allocation less than this value will be allocated "              \
4053           "using malloc. Larger allocations will use mmap.")                \
4054                                                                             \
4055   experimental(bool, AlwaysAtomicAccesses, false,                           \
4056           "Accesses to all variables should always be atomic")              \
4057                                                                             \
4058   product(bool, EnableTracing, false,                                       \
4059           "Enable event-based tracing")                                     \
4060                                                                             \
4061   product(bool, UseLockedTracing, false,                                    \
4062           "Use locked-tracing when doing event-based tracing")              \
4063                                                                             \
4064   diagnostic(bool, UseUnalignedAccesses, false,                             \
4065           "Use unaligned memory accesses in Unsafe")                        \
4066                                                                             \
4067   product_pd(bool, PreserveFramePointer,                                    \
4068              "Use the FP register for holding the frame pointer "           \
4069              "and not as a general purpose register.")                      \
4070                                                                             \
4071   diagnostic(bool, CheckIntrinsics, true,                                   \
4072              "When a class C is loaded, check that "                        \
4073              "(1) all intrinsics defined by the VM for class C are present "\
4074              "in the loaded class file and are marked with the "            \
4075              "@HotSpotIntrinsicCandidate annotation, that "                 \
4076              "(2) there is an intrinsic registered for all loaded methods " \
4077              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4078              "annotation, and that "                                        \
4079              "(3) no orphan methods exist for class C (i.e., methods for "  \
4080              "which the VM declares an intrinsic but that are not declared "\
4081              "in the loaded class C. "                                      \
4082              "Check (3) is available only in debug builds.")                \
4083                                                                             \
4084   diagnostic_pd(intx, InitArrayShortSize,                                   \
4085           "Threshold small size (in bytes) for clearing arrays. "           \
4086           "Anything this size or smaller may get converted to discrete "    \
4087           "scalar stores.")                                                 \
4088           range(0, max_intx)                                                \
4089           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4090                                                                             \
4091   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4092              "Disable backwards compatibility for compile commands.")       \
4093                                                                             \
4094   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4095              "Print compiler directives on installation.")                  \
4096   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4097              "Limit on number of compiler directives.")                     \
4098                                                                             \
4099   product(bool, EnableValhalla, false,                                      \
4100           "Enable experimental Valhalla features")                          \
4101                                                                             \
4102   product(bool, EnableMVT, false,                                           \
4103           "Enable experimental Minimal Value Types")                        \
4104                                                                             \
4105   product_pd(bool, ValueTypePassFieldsAsArgs,                               \
4106              "Pass each value type field as an argument at calls")          \
4107                                                                             \
4108   product_pd(bool, ValueTypeReturnedAsFields,                               \
4109             "return fields instead of a value type reference")              \
4110                                                                             \
4111   product(size_t, BigValueTypeThreshold, 4 * BytesPerLong,                  \
4112           "Max value type size for buffering")                              \
4113                                                                             \
4114   product(intx, ValueTypesBufferMaxMemory, 128,                             \
4115           "Max memory used for value types buffers (in pages)")             \
4116                                                                             \
4117   product(bool, ValueTypesThreadLocalRecycling, true,                       \
4118           "Enable Thread local recycling of buffered values")               \
4119                                                                             \
4120   product(bool, ReportVTBufferRecyclingTimes, false,                        \
4121           "Print duration of each VBuffer recycling")                       \
4122                                                                             \
4123   product(int, MinimumVTBufferChunkPerFrame, 2,                             \
4124           "Minimum number of VT buffer chunk allowed per frame")            \
4125                                                                             \
4126   product(bool, ZapVTBufferChunks, trueInDebug,                             \
4127           "Zap VTBufferChunk memory when recycled")                         \
4128                                                                             \
4129   develop(bool, StressValueTypeReturnedAsFields, false,                     \
4130           "stress return of fields instead of a value type reference")      \
4131                                                                             \
4132   product(bool, ReturnValuesInThreadLocalBuffer, false,                     \
4133           "Interpreter returns values in TLVB when possible")               \
4134 
4135 
4136 
4137 
4138 /*
4139  *  Macros for factoring of globals
4140  */
4141 
4142 // Interface macros
4143 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4144 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4145 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4146 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4147 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4148 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4149 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4150 #ifdef PRODUCT
4151 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4152 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4153 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4154 #else
4155 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4156 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4157 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4158 #endif // PRODUCT
4159 // Special LP64 flags, product only needed for now.
4160 #ifdef _LP64
4161 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4162 #else
4163 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4164 #endif // _LP64
4165 
4166 // Implementation macros
4167 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4168 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4169 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4170 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4171 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4172 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4173 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4174 #ifdef PRODUCT
4175 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4176 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4177 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4178 #else
4179 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4180 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4181 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4182 #endif // PRODUCT
4183 #ifdef _LP64
4184 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4185 #else
4186 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4187 #endif // _LP64
4188 
4189 // Only materialize src code for range checking when required, ignore otherwise
4190 #define IGNORE_RANGE(a, b)
4191 // Only materialize src code for contraint checking when required, ignore otherwise
4192 #define IGNORE_CONSTRAINT(func,type)
4193 
4194 #define IGNORE_WRITEABLE(type)
4195 
4196 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4197               DECLARE_PD_DEVELOPER_FLAG, \
4198               DECLARE_PRODUCT_FLAG, \
4199               DECLARE_PD_PRODUCT_FLAG, \
4200               DECLARE_DIAGNOSTIC_FLAG, \
4201               DECLARE_PD_DIAGNOSTIC_FLAG, \
4202               DECLARE_EXPERIMENTAL_FLAG, \
4203               DECLARE_NOTPRODUCT_FLAG, \
4204               DECLARE_MANAGEABLE_FLAG, \
4205               DECLARE_PRODUCT_RW_FLAG, \
4206               DECLARE_LP64_PRODUCT_FLAG, \
4207               IGNORE_RANGE, \
4208               IGNORE_CONSTRAINT, \
4209               IGNORE_WRITEABLE)
4210 
4211 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4212                  DECLARE_PD_DEVELOPER_FLAG, \
4213                  DECLARE_PRODUCT_FLAG, \
4214                  DECLARE_PD_PRODUCT_FLAG, \
4215                  DECLARE_DIAGNOSTIC_FLAG, \
4216                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4217                  DECLARE_NOTPRODUCT_FLAG, \
4218                  IGNORE_RANGE, \
4219                  IGNORE_CONSTRAINT, \
4220                  IGNORE_WRITEABLE)
4221 
4222 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4223            DECLARE_PRODUCT_FLAG, \
4224            DECLARE_DIAGNOSTIC_FLAG, \
4225            DECLARE_EXPERIMENTAL_FLAG, \
4226            DECLARE_NOTPRODUCT_FLAG, \
4227            IGNORE_RANGE, \
4228            IGNORE_CONSTRAINT, \
4229            IGNORE_WRITEABLE)
4230 
4231 // Extensions
4232 
4233 #include "runtime/globals_ext.hpp"
4234 
4235 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---