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