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     COMMERCIAL_FLAG_BUT_DISABLED,
 189     COMMERCIAL_FLAG_BUT_LOCKED
 190   };
 191 
 192   const char* _type;
 193   const char* _name;
 194   void* _addr;
 195   NOT_PRODUCT(const char* _doc;)
 196   Flags _flags;
 197   size_t _name_len;
 198 
 199   // points to all Flags static array
 200   static Flag* flags;
 201 
 202   // number of flags
 203   static size_t numFlags;
 204 
 205   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 206   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 207   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 208 
 209   static const char* get_int_default_range_str();
 210   static const char* get_uint_default_range_str();
 211   static const char* get_intx_default_range_str();
 212   static const char* get_uintx_default_range_str();
 213   static const char* get_uint64_t_default_range_str();
 214   static const char* get_size_t_default_range_str();
 215   static const char* get_double_default_range_str();
 216 
 217   Flag::Error check_writable(bool changed);
 218 
 219   bool is_bool() const;
 220   bool get_bool() const;
 221   Flag::Error set_bool(bool value);
 222 
 223   bool is_int() const;
 224   int get_int() const;
 225   Flag::Error set_int(int value);
 226 
 227   bool is_uint() const;
 228   uint get_uint() const;
 229   Flag::Error set_uint(uint value);
 230 
 231   bool is_intx() const;
 232   intx get_intx() const;
 233   Flag::Error set_intx(intx value);
 234 
 235   bool is_uintx() const;
 236   uintx get_uintx() const;
 237   Flag::Error set_uintx(uintx value);
 238 
 239   bool is_uint64_t() const;
 240   uint64_t get_uint64_t() const;
 241   Flag::Error set_uint64_t(uint64_t value);
 242 
 243   bool is_size_t() const;
 244   size_t get_size_t() const;
 245   Flag::Error set_size_t(size_t value);
 246 
 247   bool is_double() const;
 248   double get_double() const;
 249   Flag::Error set_double(double value);
 250 
 251   bool is_ccstr() const;
 252   bool ccstr_accumulates() const;
 253   ccstr get_ccstr() const;
 254   Flag::Error set_ccstr(ccstr value);
 255 
 256   Flags get_origin();
 257   void set_origin(Flags origin);
 258 
 259   size_t get_name_length();
 260 
 261   bool is_default();
 262   bool is_ergonomic();
 263   bool is_command_line();
 264   void set_command_line();
 265 
 266   bool is_product() const;
 267   bool is_manageable() const;
 268   bool is_diagnostic() const;
 269   bool is_experimental() const;
 270   bool is_notproduct() const;
 271   bool is_develop() const;
 272   bool is_read_write() const;
 273   bool is_commercial() const;
 274 
 275   bool is_constant_in_binary() const;
 276 
 277   bool is_unlocker() const;
 278   bool is_unlocked() const;
 279   bool is_writeable() const;
 280   bool is_external() const;
 281 
 282   bool is_unlocker_ext() const;
 283   bool is_unlocked_ext() const;
 284   bool is_writeable_ext() const;
 285   bool is_external_ext() const;
 286 
 287   void clear_diagnostic();
 288 
 289   Flag::MsgType get_locked_message(char*, int) const;
 290   Flag::MsgType get_locked_message_ext(char*, int) const;
 291 
 292   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 293   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 294   void print_kind(outputStream* st, unsigned int width);
 295   void print_origin(outputStream* st, unsigned int width);
 296   void print_as_flag(outputStream* st);
 297 
 298   static const char* flag_error_str(Flag::Error error);
 299 };
 300 
 301 // debug flags control various aspects of the VM and are global accessible
 302 
 303 // use FlagSetting to temporarily change some debug flag
 304 // e.g. FlagSetting fs(DebugThisAndThat, true);
 305 // restored to previous value upon leaving scope
 306 class FlagSetting {
 307   bool val;
 308   bool* flag;
 309  public:
 310   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 311   ~FlagSetting()                       { *flag = val; }
 312 };
 313 
 314 
 315 class CounterSetting {
 316   intx* counter;
 317  public:
 318   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 319   ~CounterSetting()         { (*counter)--; }
 320 };
 321 
 322 class IntFlagSetting {
 323   int val;
 324   int* flag;
 325  public:
 326   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 327   ~IntFlagSetting()                     { *flag = val; }
 328 };
 329 
 330 class UIntFlagSetting {
 331   uint val;
 332   uint* flag;
 333  public:
 334   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 335   ~UIntFlagSetting()                       { *flag = val; }
 336 };
 337 
 338 class UIntXFlagSetting {
 339   uintx val;
 340   uintx* flag;
 341  public:
 342   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 343   ~UIntXFlagSetting()                         { *flag = val; }
 344 };
 345 
 346 class DoubleFlagSetting {
 347   double val;
 348   double* flag;
 349  public:
 350   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 351   ~DoubleFlagSetting()                           { *flag = val; }
 352 };
 353 
 354 class SizeTFlagSetting {
 355   size_t val;
 356   size_t* flag;
 357  public:
 358   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 359   ~SizeTFlagSetting()                           { *flag = val; }
 360 };
 361 
 362 // Helper class for temporarily saving the value of a flag during a scope.
 363 template <size_t SIZE>
 364 class FlagGuard {
 365   unsigned char _value[SIZE];
 366   void* const _addr;
 367 
 368   // Hide operator new, this class should only be allocated on the stack.
 369   // NOTE: Cannot include memory/allocation.hpp here due to circular
 370   //       dependencies.
 371   void* operator new(size_t size) throw();
 372   void* operator new [](size_t size) throw();
 373 
 374  public:
 375   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 376     memcpy(_value, _addr, SIZE);
 377   }
 378 
 379   ~FlagGuard() {
 380     memcpy(_addr, _value, SIZE);
 381   }
 382 };
 383 
 384 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 385 
 386 class CommandLineFlags {
 387 public:
 388   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 389   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); }
 390   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 391   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 392   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 393 
 394   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 395   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); }
 396   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 397   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 398   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 399 
 400   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 401   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); }
 402   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 403   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 404   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 405 
 406   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 407   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); }
 408   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 409   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 410   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 411 
 412   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 413   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); }
 414   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 415   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 416   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 417 
 418   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 419   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); }
 420   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 421   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 422   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 423 
 424   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 425   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); }
 426   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 427   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 428   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 429 
 430   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 431   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); }
 432   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 433   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 434   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 435 
 436   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 437   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); }
 438   // Contract:  Flag will make private copy of the incoming value.
 439   // Outgoing value is always malloc-ed, and caller MUST call free.
 440   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 441   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 442 
 443   // Returns false if name is not a command line flag.
 444   static bool wasSetOnCmdline(const char* name, bool* value);
 445   static void printSetFlags(outputStream* out);
 446 
 447   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 448   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 449 
 450   static void verify() PRODUCT_RETURN;
 451 };
 452 
 453 // use this for flags that are true by default in the debug version but
 454 // false in the optimized version, and vice versa
 455 #ifdef ASSERT
 456 #define trueInDebug  true
 457 #define falseInDebug false
 458 #else
 459 #define trueInDebug  false
 460 #define falseInDebug true
 461 #endif
 462 
 463 // use this for flags that are true per default in the product build
 464 // but false in development builds, and vice versa
 465 #ifdef PRODUCT
 466 #define trueInProduct  true
 467 #define falseInProduct false
 468 #else
 469 #define trueInProduct  false
 470 #define falseInProduct true
 471 #endif
 472 
 473 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 474 // product flags are always settable / visible
 475 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 476 
 477 // A flag must be declared with one of the following types:
 478 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 479 // The type "ccstr" is an alias for "const char*" and is used
 480 // only in this file, because the macrology requires single-token type names.
 481 
 482 // Note: Diagnostic options not meant for VM tuning or for product modes.
 483 // They are to be used for VM quality assurance or field diagnosis
 484 // of VM bugs.  They are hidden so that users will not be encouraged to
 485 // try them as if they were VM ordinary execution options.  However, they
 486 // are available in the product version of the VM.  Under instruction
 487 // from support engineers, VM customers can turn them on to collect
 488 // diagnostic information about VM problems.  To use a VM diagnostic
 489 // option, you must first specify +UnlockDiagnosticVMOptions.
 490 // (This master switch also affects the behavior of -Xprintflags.)
 491 //
 492 // experimental flags are in support of features that are not
 493 //    part of the officially supported product, but are available
 494 //    for experimenting with. They could, for example, be performance
 495 //    features that may not have undergone full or rigorous QA, but which may
 496 //    help performance in some cases and released for experimentation
 497 //    by the community of users and developers. This flag also allows one to
 498 //    be able to build a fully supported product that nonetheless also
 499 //    ships with some unsupported, lightly tested, experimental features.
 500 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 501 //    UnlockExperimentalVMOptions flag, which allows the control and
 502 //    modification of the experimental flags.
 503 //
 504 // Nota bene: neither diagnostic nor experimental options should be used casually,
 505 //    and they are not supported on production loads, except under explicit
 506 //    direction from support engineers.
 507 //
 508 // manageable flags are writeable external product flags.
 509 //    They are dynamically writeable through the JDK management interface
 510 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 511 //    These flags are external exported interface (see CCC).  The list of
 512 //    manageable flags can be queried programmatically through the management
 513 //    interface.
 514 //
 515 //    A flag can be made as "manageable" only if
 516 //    - the flag is defined in a CCC as an external exported interface.
 517 //    - the VM implementation supports dynamic setting of the flag.
 518 //      This implies that the VM must *always* query the flag variable
 519 //      and not reuse state related to the flag state at any given time.
 520 //    - you want the flag to be queried programmatically by the customers.
 521 //
 522 // product_rw flags are writeable internal product flags.
 523 //    They are like "manageable" flags but for internal/private use.
 524 //    The list of product_rw flags are internal/private flags which
 525 //    may be changed/removed in a future release.  It can be set
 526 //    through the management interface to get/set value
 527 //    when the name of flag is supplied.
 528 //
 529 //    A flag can be made as "product_rw" only if
 530 //    - the VM implementation supports dynamic setting of the flag.
 531 //      This implies that the VM must *always* query the flag variable
 532 //      and not reuse state related to the flag state at any given time.
 533 //
 534 // Note that when there is a need to support develop flags to be writeable,
 535 // it can be done in the same way as product_rw.
 536 //
 537 // range is a macro that will expand to min and max arguments for range
 538 //    checking code if provided - see commandLineFlagRangeList.hpp
 539 //
 540 // constraint is a macro that will expand to custom function call
 541 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 542 //
 543 // writeable is a macro that controls if and how the value can change during the runtime
 544 //
 545 // writeable(Always) is optional and allows the flag to have its value changed
 546 //    without any limitations at any time
 547 //
 548 // writeable(Once) flag value's can be only set once during the lifetime of VM
 549 //
 550 // writeable(CommandLineOnly) flag value's can be only set from command line
 551 //    (multiple times allowed)
 552 //
 553 
 554 
 555 #define RUNTIME_FLAGS(develop, \
 556                       develop_pd, \
 557                       product, \
 558                       product_pd, \
 559                       diagnostic, \
 560                       diagnostic_pd, \
 561                       experimental, \
 562                       notproduct, \
 563                       manageable, \
 564                       product_rw, \
 565                       lp64_product, \
 566                       range, \
 567                       constraint, \
 568                       writeable) \
 569                                                                             \
 570   lp64_product(bool, UseCompressedOops, false,                              \
 571           "Use 32-bit object references in 64-bit VM. "                     \
 572           "lp64_product means flag is always constant in 32 bit VM")        \
 573                                                                             \
 574   lp64_product(bool, UseCompressedClassPointers, false,                     \
 575           "Use 32-bit class pointers in 64-bit VM. "                        \
 576           "lp64_product means flag is always constant in 32 bit VM")        \
 577                                                                             \
 578   notproduct(bool, CheckCompressedOops, true,                               \
 579           "Generate checks in encoding/decoding code in debug VM")          \
 580                                                                             \
 581   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 582           "Heap allocation steps through preferred address regions to find" \
 583           " where it can allocate the heap. Number of steps to take per "   \
 584           "region.")                                                        \
 585           range(1, max_uintx)                                               \
 586                                                                             \
 587   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 588           "Default object alignment in bytes, 8 is minimum")                \
 589           range(8, 256)                                                     \
 590           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 591                                                                             \
 592   product(bool, AssumeMP, true,                                             \
 593           "(Deprecated) Instruct the VM to assume multiple processors are available")\
 594                                                                             \
 595   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 596   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 597   /* been re-added (see 6401008)                                         */ \
 598   product_pd(bool, UseMembar,                                               \
 599           "(Unstable) Issues membars on thread state transitions")          \
 600                                                                             \
 601   develop(bool, CleanChunkPoolAsync, true,                                  \
 602           "Clean the chunk pool asynchronously")                            \
 603                                                                             \
 604   product_pd(bool, ThreadLocalHandshakes,                                   \
 605           "Use thread-local polls instead of global poll for safepoints.")  \
 606           constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo)         \
 607                                                                             \
 608   diagnostic(uint, HandshakeTimeout, 0,                                     \
 609           "If nonzero set a timeout in milliseconds for handshakes")        \
 610                                                                             \
 611   experimental(bool, AlwaysSafeConstructors, false,                         \
 612           "Force safe construction, as if all fields are final.")           \
 613                                                                             \
 614   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 615           "Enable normal processing of flags relating to field diagnostics")\
 616                                                                             \
 617   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 618           "Enable normal processing of flags relating to experimental "     \
 619           "features")                                                       \
 620                                                                             \
 621   product(bool, JavaMonitorsInStackTrace, true,                             \
 622           "Print information about Java monitor locks when the stacks are"  \
 623           "dumped")                                                         \
 624                                                                             \
 625   product_pd(bool, UseLargePages,                                           \
 626           "Use large page memory")                                          \
 627                                                                             \
 628   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 629           "Allocate large pages individually for better affinity")          \
 630                                                                             \
 631   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 632           "Fail large pages individual allocation")                         \
 633                                                                             \
 634   product(bool, UseLargePagesInMetaspace, false,                            \
 635           "Use large page memory in metaspace. "                            \
 636           "Only used if UseLargePages is enabled.")                         \
 637                                                                             \
 638   product(bool, UseNUMA, false,                                             \
 639           "Use NUMA if available")                                          \
 640                                                                             \
 641   product(bool, UseNUMAInterleaving, false,                                 \
 642           "Interleave memory across NUMA nodes if available")               \
 643                                                                             \
 644   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 645           "Granularity to use for NUMA interleaving on Windows OS")         \
 646           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 647                                                                             \
 648   product(bool, ForceNUMA, false,                                           \
 649           "Force NUMA optimizations on single-node/UMA systems")            \
 650                                                                             \
 651   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 652           "Percentage (0-100) used to weight the current sample when "      \
 653           "computing exponentially decaying average for "                   \
 654           "AdaptiveNUMAChunkSizing")                                        \
 655           range(0, 100)                                                     \
 656                                                                             \
 657   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 658           "Do not reallocate more than this amount per collection")         \
 659           range(0, max_uintx)                                               \
 660                                                                             \
 661   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 662           "Enable adaptive chunk sizing for NUMA")                          \
 663                                                                             \
 664   product(bool, NUMAStats, false,                                           \
 665           "Print NUMA stats in detailed heap information")                  \
 666                                                                             \
 667   product(uintx, NUMAPageScanRate, 256,                                     \
 668           "Maximum number of pages to include in the page scan procedure")  \
 669           range(0, max_uintx)                                               \
 670                                                                             \
 671   product_pd(bool, NeedsDeoptSuspend,                                       \
 672           "True for register window machines (sparc/ia64)")                 \
 673                                                                             \
 674   product(intx, UseSSE, 99,                                                 \
 675           "Highest supported SSE instructions set on x86/x64")              \
 676           range(0, 99)                                                      \
 677                                                                             \
 678   product(bool, UseAES, false,                                              \
 679           "Control whether AES instructions are used when available")       \
 680                                                                             \
 681   product(bool, UseFMA, false,                                              \
 682           "Control whether FMA instructions are used when available")       \
 683                                                                             \
 684   product(bool, UseSHA, false,                                              \
 685           "Control whether SHA instructions are used when available")       \
 686                                                                             \
 687   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 688           "Use intrinsics for GHASH versions of crypto")                    \
 689                                                                             \
 690   product(size_t, LargePageSizeInBytes, 0,                                  \
 691           "Large page size (0 to let VM choose the page size)")             \
 692           range(0, max_uintx)                                               \
 693                                                                             \
 694   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 695           "Use large pages if maximum heap is at least this big")           \
 696           range(0, max_uintx)                                               \
 697                                                                             \
 698   product(bool, ForceTimeHighResolution, false,                             \
 699           "Using high time resolution (for Win32 only)")                    \
 700                                                                             \
 701   develop(bool, TracePcPatching, false,                                     \
 702           "Trace usage of frame::patch_pc")                                 \
 703                                                                             \
 704   develop(bool, TraceRelocator, false,                                      \
 705           "Trace the bytecode relocator")                                   \
 706                                                                             \
 707   develop(bool, TraceLongCompiles, false,                                   \
 708           "Print out every time compilation is longer than "                \
 709           "a given threshold")                                              \
 710                                                                             \
 711   develop(bool, SafepointALot, false,                                       \
 712           "Generate a lot of safepoints. This works with "                  \
 713           "GuaranteedSafepointInterval")                                    \
 714                                                                             \
 715   product_pd(bool, BackgroundCompilation,                                   \
 716           "A thread requesting compilation is not blocked during "          \
 717           "compilation")                                                    \
 718                                                                             \
 719   product(bool, PrintVMQWaitTime, false,                                    \
 720           "Print out the waiting time in VM operation queue")               \
 721                                                                             \
 722   product(bool, MethodFlushing, true,                                       \
 723           "Reclamation of zombie and not-entrant methods")                  \
 724                                                                             \
 725   develop(bool, VerifyStack, false,                                         \
 726           "Verify stack of each thread when it is entering a runtime call") \
 727                                                                             \
 728   diagnostic(bool, ForceUnreachable, false,                                 \
 729           "Make all non code cache addresses to be unreachable by "         \
 730           "forcing use of 64bit literal fixups")                            \
 731                                                                             \
 732   notproduct(bool, StressDerivedPointers, false,                            \
 733           "Force scavenge when a derived pointer is detected on stack "     \
 734           "after rtm call")                                                 \
 735                                                                             \
 736   develop(bool, TraceDerivedPointers, false,                                \
 737           "Trace traversal of derived pointers on stack")                   \
 738                                                                             \
 739   notproduct(bool, TraceCodeBlobStacks, false,                              \
 740           "Trace stack-walk of codeblobs")                                  \
 741                                                                             \
 742   product(bool, PrintJNIResolving, false,                                   \
 743           "Used to implement -v:jni")                                       \
 744                                                                             \
 745   notproduct(bool, PrintRewrites, false,                                    \
 746           "Print methods that are being rewritten")                         \
 747                                                                             \
 748   product(bool, UseInlineCaches, true,                                      \
 749           "Use Inline Caches for virtual calls ")                           \
 750                                                                             \
 751   diagnostic(bool, InlineArrayCopy, true,                                   \
 752           "Inline arraycopy native that is known to be part of "            \
 753           "base library DLL")                                               \
 754                                                                             \
 755   diagnostic(bool, InlineObjectHash, true,                                  \
 756           "Inline Object::hashCode() native that is known to be part "      \
 757           "of base library DLL")                                            \
 758                                                                             \
 759   diagnostic(bool, InlineNatives, true,                                     \
 760           "Inline natives that are known to be part of base library DLL")   \
 761                                                                             \
 762   diagnostic(bool, InlineMathNatives, true,                                 \
 763           "Inline SinD, CosD, etc.")                                        \
 764                                                                             \
 765   diagnostic(bool, InlineClassNatives, true,                                \
 766           "Inline Class.isInstance, etc")                                   \
 767                                                                             \
 768   diagnostic(bool, InlineThreadNatives, true,                               \
 769           "Inline Thread.currentThread, etc")                               \
 770                                                                             \
 771   diagnostic(bool, InlineUnsafeOps, true,                                   \
 772           "Inline memory ops (native methods) from Unsafe")                 \
 773                                                                             \
 774   product(bool, CriticalJNINatives, true,                                   \
 775           "Check for critical JNI entry points")                            \
 776                                                                             \
 777   notproduct(bool, StressCriticalJNINatives, false,                         \
 778           "Exercise register saving code in critical natives")              \
 779                                                                             \
 780   diagnostic(bool, UseAESIntrinsics, false,                                 \
 781           "Use intrinsics for AES versions of crypto")                      \
 782                                                                             \
 783   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 784           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 785                                                                             \
 786   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 787           "Use intrinsics for SHA-1 crypto hash function. "                 \
 788           "Requires that UseSHA is enabled.")                               \
 789                                                                             \
 790   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 791           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 792           "Requires that UseSHA is enabled.")                               \
 793                                                                             \
 794   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 795           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 796           "Requires that UseSHA is enabled.")                               \
 797                                                                             \
 798   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 799           "use intrinsics for java.util.zip.CRC32")                         \
 800                                                                             \
 801   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 802           "use intrinsics for java.util.zip.CRC32C")                        \
 803                                                                             \
 804   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 805           "use intrinsics for java.util.zip.Adler32")                       \
 806                                                                             \
 807   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 808           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 809                                                                             \
 810   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 811          "do not expand intrinsics whose (internal) names appear here")     \
 812                                                                             \
 813   develop(bool, TraceCallFixup, false,                                      \
 814           "Trace all call fixups")                                          \
 815                                                                             \
 816   develop(bool, DeoptimizeALot, false,                                      \
 817           "Deoptimize at every exit from the runtime system")               \
 818                                                                             \
 819   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 820           "A comma separated list of bcis to deoptimize at")                \
 821                                                                             \
 822   product(bool, DeoptimizeRandom, false,                                    \
 823           "Deoptimize random frames on random exit from the runtime system")\
 824                                                                             \
 825   notproduct(bool, ZombieALot, false,                                       \
 826           "Create zombies (non-entrant) at exit from the runtime system")   \
 827                                                                             \
 828   product(bool, UnlinkSymbolsALot, false,                                   \
 829           "Unlink unreferenced symbols from the symbol table at safepoints")\
 830                                                                             \
 831   notproduct(bool, WalkStackALot, false,                                    \
 832           "Trace stack (no print) at every exit from the runtime system")   \
 833                                                                             \
 834   product(bool, Debugging, false,                                           \
 835           "Set when executing debug methods in debug.cpp "                  \
 836           "(to prevent triggering assertions)")                             \
 837                                                                             \
 838   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 839           "Enable strict checks that safepoints cannot happen for threads " \
 840           "that use NoSafepointVerifier")                                   \
 841                                                                             \
 842   notproduct(bool, VerifyLastFrame, false,                                  \
 843           "Verify oops on last frame on entry to VM")                       \
 844                                                                             \
 845   product(bool, FailOverToOldVerifier, true,                                \
 846           "Fail over to old verifier when split verifier fails")            \
 847                                                                             \
 848   product(bool, SafepointTimeout, false,                                    \
 849           "Time out and warn or fail after SafepointTimeoutDelay "          \
 850           "milliseconds if failed to reach safepoint")                      \
 851                                                                             \
 852   develop(bool, DieOnSafepointTimeout, false,                               \
 853           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 854                                                                             \
 855   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 856   /* typically, at most a few retries are needed                    */      \
 857   product(intx, SuspendRetryCount, 50,                                      \
 858           "Maximum retry count for an external suspend request")            \
 859           range(0, max_intx)                                                \
 860                                                                             \
 861   product(intx, SuspendRetryDelay, 5,                                       \
 862           "Milliseconds to delay per retry (* current_retry_count)")        \
 863           range(0, max_intx)                                                \
 864                                                                             \
 865   product(bool, AssertOnSuspendWaitFailure, false,                          \
 866           "Assert/Guarantee on external suspend wait failure")              \
 867                                                                             \
 868   product(bool, TraceSuspendWaitFailures, false,                            \
 869           "Trace external suspend wait failures")                           \
 870                                                                             \
 871   product(bool, MaxFDLimit, true,                                           \
 872           "Bump the number of file descriptors to maximum in Solaris")      \
 873                                                                             \
 874   diagnostic(bool, LogEvents, true,                                         \
 875           "Enable the various ring buffer event logs")                      \
 876                                                                             \
 877   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 878           "Number of ring buffer event logs")                               \
 879           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 880                                                                             \
 881   product(bool, BytecodeVerificationRemote, true,                           \
 882           "Enable the Java bytecode verifier for remote classes")           \
 883                                                                             \
 884   product(bool, BytecodeVerificationLocal, false,                           \
 885           "Enable the Java bytecode verifier for local classes")            \
 886                                                                             \
 887   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 888           "Force exceptions on FP stack under/overflow")                    \
 889                                                                             \
 890   develop(bool, VerifyStackAtCalls, false,                                  \
 891           "Verify that the stack pointer is unchanged after calls")         \
 892                                                                             \
 893   develop(bool, TraceJavaAssertions, false,                                 \
 894           "Trace java language assertions")                                 \
 895                                                                             \
 896   notproduct(bool, VerifyCodeCache, false,                                  \
 897           "Verify code cache on memory allocation/deallocation")            \
 898                                                                             \
 899   develop(bool, UseMallocOnly, false,                                       \
 900           "Use only malloc/free for allocation (no resource area/arena)")   \
 901                                                                             \
 902   develop(bool, PrintMallocStatistics, false,                               \
 903           "Print malloc/free statistics")                                   \
 904                                                                             \
 905   develop(bool, ZapResourceArea, trueInDebug,                               \
 906           "Zap freed resource/arena space with 0xABABABAB")                 \
 907                                                                             \
 908   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 909           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 910                                                                             \
 911   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 912           "Zap allocated/freed stack segments with 0xFADFADED")             \
 913                                                                             \
 914   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 915           "Zap unused heap space with 0xBAADBABE")                          \
 916                                                                             \
 917   develop(bool, CheckZapUnusedHeapArea, false,                              \
 918           "Check zapping of unused heap space")                             \
 919                                                                             \
 920   develop(bool, ZapFillerObjects, trueInDebug,                              \
 921           "Zap filler objects with 0xDEAFBABE")                             \
 922                                                                             \
 923   develop(bool, PrintVMMessages, true,                                      \
 924           "Print VM messages on console")                                   \
 925                                                                             \
 926   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 927           "If > 0, provokes an error after VM initialization; the value "   \
 928           "determines which error to provoke. See test_error_handler() "    \
 929           "in vmError.cpp.")                                                \
 930                                                                             \
 931   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 932           "If > 0, provokes an error inside VM error handler (a secondary " \
 933           "crash). see test_error_handler() in vmError.cpp")                \
 934                                                                             \
 935   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 936           "If true, tests SafeFetch inside error handler.")                 \
 937                                                                             \
 938   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 939           "If true, simulates an unresponsive error handler.")              \
 940                                                                             \
 941   develop(bool, Verbose, false,                                             \
 942           "Print additional debugging information from other modes")        \
 943                                                                             \
 944   develop(bool, PrintMiscellaneous, false,                                  \
 945           "Print uncategorized debugging information (requires +Verbose)")  \
 946                                                                             \
 947   develop(bool, WizardMode, false,                                          \
 948           "Print much more debugging information")                          \
 949                                                                             \
 950   product(bool, ShowMessageBoxOnError, false,                               \
 951           "Keep process alive on VM fatal error")                           \
 952                                                                             \
 953   product(bool, CreateCoredumpOnCrash, true,                                \
 954           "Create core/mini dump on VM fatal error")                        \
 955                                                                             \
 956   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 957           "Timeout, in seconds, to limit the time spent on writing an "     \
 958           "error log in case of a crash.")                                  \
 959           range(0, (uint64_t)max_jlong/1000)                                \
 960                                                                             \
 961   product_pd(bool, UseOSErrorReporting,                                     \
 962           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 963                                                                             \
 964   product(bool, SuppressFatalErrorMessage, false,                           \
 965           "Report NO fatal error message (avoid deadlock)")                 \
 966                                                                             \
 967   product(ccstrlist, OnError, "",                                           \
 968           "Run user-defined commands on fatal error; see VMError.cpp "      \
 969           "for examples")                                                   \
 970                                                                             \
 971   product(ccstrlist, OnOutOfMemoryError, "",                                \
 972           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 973                                                                             \
 974   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 975           "Dump heap to file before any major stop-the-world GC")           \
 976                                                                             \
 977   manageable(bool, HeapDumpAfterFullGC, false,                              \
 978           "Dump heap to file after any major stop-the-world GC")            \
 979                                                                             \
 980   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 981           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 982                                                                             \
 983   manageable(ccstr, HeapDumpPath, NULL,                                     \
 984           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 985           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 986           "in the working directory)")                                      \
 987                                                                             \
 988   develop(bool, BreakAtWarning, false,                                      \
 989           "Execute breakpoint upon encountering VM warning")                \
 990                                                                             \
 991   develop(bool, UseFakeTimers, false,                                       \
 992           "Tell whether the VM should use system time or a fake timer")     \
 993                                                                             \
 994   product(ccstr, NativeMemoryTracking, "off",                               \
 995           "Native memory tracking options")                                 \
 996                                                                             \
 997   diagnostic(bool, PrintNMTStatistics, false,                               \
 998           "Print native memory tracking summary data if it is on")          \
 999                                                                             \
1000   diagnostic(bool, LogCompilation, false,                                   \
1001           "Log compilation activity in detail to LogFile")                  \
1002                                                                             \
1003   product(bool, PrintCompilation, false,                                    \
1004           "Print compilations")                                             \
1005                                                                             \
1006   diagnostic(bool, TraceNMethodInstalls, false,                             \
1007           "Trace nmethod installation")                                     \
1008                                                                             \
1009   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1010           "0: do not allow scavengable oops in the code cache; "            \
1011           "1: allow scavenging from the code cache; "                       \
1012           "2: emit as many constants as the compiler can see")              \
1013           range(0, 2)                                                       \
1014                                                                             \
1015   product(bool, AlwaysRestoreFPU, false,                                    \
1016           "Restore the FPU control word after every JNI call (expensive)")  \
1017                                                                             \
1018   diagnostic(bool, PrintCompilation2, false,                                \
1019           "Print additional statistics per compilation")                    \
1020                                                                             \
1021   diagnostic(bool, PrintAdapterHandlers, false,                             \
1022           "Print code generated for i2c/c2i adapters")                      \
1023                                                                             \
1024   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1025           "Verify that i2c/c2i adapters are called properly")               \
1026                                                                             \
1027   develop(bool, VerifyAdapterSharing, false,                                \
1028           "Verify that the code for shared adapters is the equivalent")     \
1029                                                                             \
1030   diagnostic(bool, PrintAssembly, false,                                    \
1031           "Print assembly code (using external disassembler.so)")           \
1032                                                                             \
1033   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1034           "Print options string passed to disassembler.so")                 \
1035                                                                             \
1036   notproduct(bool, PrintNMethodStatistics, false,                           \
1037           "Print a summary statistic for the generated nmethods")           \
1038                                                                             \
1039   diagnostic(bool, PrintNMethods, false,                                    \
1040           "Print assembly code for nmethods when generated")                \
1041                                                                             \
1042   diagnostic(bool, PrintNativeNMethods, false,                              \
1043           "Print assembly code for native nmethods when generated")         \
1044                                                                             \
1045   develop(bool, PrintDebugInfo, false,                                      \
1046           "Print debug information for all nmethods when generated")        \
1047                                                                             \
1048   develop(bool, PrintRelocations, false,                                    \
1049           "Print relocation information for all nmethods when generated")   \
1050                                                                             \
1051   develop(bool, PrintDependencies, false,                                   \
1052           "Print dependency information for all nmethods when generated")   \
1053                                                                             \
1054   develop(bool, PrintExceptionHandlers, false,                              \
1055           "Print exception handler tables for all nmethods when generated") \
1056                                                                             \
1057   develop(bool, StressCompiledExceptionHandlers, false,                     \
1058           "Exercise compiled exception handlers")                           \
1059                                                                             \
1060   develop(bool, InterceptOSException, false,                                \
1061           "Start debugger when an implicit OS (e.g. NULL) "                 \
1062           "exception happens")                                              \
1063                                                                             \
1064   product(bool, PrintCodeCache, false,                                      \
1065           "Print the code cache memory usage when exiting")                 \
1066                                                                             \
1067   develop(bool, PrintCodeCache2, false,                                     \
1068           "Print detailed usage information on the code cache when exiting")\
1069                                                                             \
1070   product(bool, PrintCodeCacheOnCompilation, false,                         \
1071           "Print the code cache memory usage each time a method is "        \
1072           "compiled")                                                       \
1073                                                                             \
1074   diagnostic(bool, PrintStubCode, false,                                    \
1075           "Print generated stub code")                                      \
1076                                                                             \
1077   product(bool, StackTraceInThrowable, true,                                \
1078           "Collect backtrace in throwable when exception happens")          \
1079                                                                             \
1080   product(bool, OmitStackTraceInFastThrow, true,                            \
1081           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1082                                                                             \
1083   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1084           "Print bytecode statistics when dumping profiler output")         \
1085                                                                             \
1086   product(bool, ProfilerRecordPC, false,                                    \
1087           "Collect ticks for each 16 byte interval of compiled code")       \
1088                                                                             \
1089   product(bool, ProfileVM, false,                                           \
1090           "Profile ticks that fall within VM (either in the VM Thread "     \
1091           "or VM code called through stubs)")                               \
1092                                                                             \
1093   product(bool, ProfileIntervals, false,                                    \
1094           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1095                                                                             \
1096   notproduct(bool, ProfilerCheckIntervals, false,                           \
1097           "Collect and print information on spacing of profiler ticks")     \
1098                                                                             \
1099   product(bool, PrintWarnings, true,                                        \
1100           "Print JVM warnings to output stream")                            \
1101                                                                             \
1102   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1103           "Print warnings for stalled SpinLocks")                           \
1104                                                                             \
1105   product(bool, RegisterFinalizersAtInit, true,                             \
1106           "Register finalizable objects at end of Object.<init> or "        \
1107           "after allocation")                                               \
1108                                                                             \
1109   develop(bool, RegisterReferences, true,                                   \
1110           "Tell whether the VM should register soft/weak/final/phantom "    \
1111           "references")                                                     \
1112                                                                             \
1113   develop(bool, IgnoreRewrites, false,                                      \
1114           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1115           "This is unsafe!")                                                \
1116                                                                             \
1117   develop(bool, PrintCodeCacheExtension, false,                             \
1118           "Print extension of code cache")                                  \
1119                                                                             \
1120   develop(bool, UsePrivilegedStack, true,                                   \
1121           "Enable the security JVM functions")                              \
1122                                                                             \
1123   develop(bool, ProtectionDomainVerification, true,                         \
1124           "Verify protection domain before resolution in system dictionary")\
1125                                                                             \
1126   product(bool, ClassUnloading, true,                                       \
1127           "Do unloading of classes")                                        \
1128                                                                             \
1129   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1130           "Do unloading of classes with a concurrent marking cycle")        \
1131                                                                             \
1132   develop(bool, DisableStartThread, false,                                  \
1133           "Disable starting of additional Java threads "                    \
1134           "(for debugging only)")                                           \
1135                                                                             \
1136   develop(bool, MemProfiling, false,                                        \
1137           "Write memory usage profiling to log file")                       \
1138                                                                             \
1139   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1140           "Print the system dictionary at exit")                            \
1141                                                                             \
1142   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
1143           "Dynamically resize system dictionaries as needed")               \
1144                                                                             \
1145   product(bool, AlwaysLockClassLoader, false,                               \
1146           "Require the VM to acquire the class loader lock before calling " \
1147           "loadClass() even for class loaders registering "                 \
1148           "as parallel capable")                                            \
1149                                                                             \
1150   product(bool, AllowParallelDefineClass, false,                            \
1151           "Allow parallel defineClass requests for class loaders "          \
1152           "registering as parallel capable")                                \
1153                                                                             \
1154   product_pd(bool, DontYieldALot,                                           \
1155           "Throw away obvious excess yield calls")                          \
1156                                                                             \
1157   develop(bool, UseDetachedThreads, true,                                   \
1158           "Use detached threads that are recycled upon termination "        \
1159           "(for Solaris only)")                                             \
1160                                                                             \
1161   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
1162                "Disable the use of stack guard pages if the JVM is loaded " \
1163                "on the primordial process thread")                          \
1164                                                                             \
1165   product(bool, UseLWPSynchronization, true,                                \
1166           "Use LWP-based instead of libthread-based synchronization "       \
1167           "(SPARC only)")                                                   \
1168                                                                             \
1169   experimental(ccstr, SyncKnobs, NULL,                                      \
1170                "(Unstable) Various monitor synchronization tunables")       \
1171                                                                             \
1172   experimental(intx, EmitSync, 0,                                           \
1173                "(Unsafe, Unstable) "                                        \
1174                "Control emission of inline sync fast-path code")            \
1175                                                                             \
1176   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1177           range(0, max_jint)                                                \
1178                                                                             \
1179   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1180                                                                             \
1181   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1182                 "Percentage of used monitors before triggering cleanup "    \
1183                 "safepoint which deflates monitors (0 is off). "            \
1184                 "The check is performed on GuaranteedSafepointInterval.")   \
1185                 range(0, 100)                                               \
1186                                                                             \
1187   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1188                "Experimental Sync flags")                                   \
1189                                                                             \
1190   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1191                                                                             \
1192   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1193                                                                             \
1194   experimental(intx, hashCode, 5,                                           \
1195                "(Unstable) select hashCode generation algorithm")           \
1196                                                                             \
1197   product(bool, FilterSpuriousWakeups, true,                                \
1198           "When true prevents OS-level spurious, or premature, wakeups "    \
1199           "from Object.wait (Ignored for Windows)")                         \
1200                                                                             \
1201   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1202                                                                             \
1203   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1204                                                                             \
1205   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1206                                                                             \
1207   develop(bool, UsePthreads, false,                                         \
1208           "Use pthread-based instead of libthread-based synchronization "   \
1209           "(SPARC only)")                                                   \
1210                                                                             \
1211   product(bool, ReduceSignalUsage, false,                                   \
1212           "Reduce the use of OS signals in Java and/or the VM")             \
1213                                                                             \
1214   develop_pd(bool, ShareVtableStubs,                                        \
1215           "Share vtable stubs (smaller code but worse branch prediction")   \
1216                                                                             \
1217   develop(bool, LoadLineNumberTables, true,                                 \
1218           "Tell whether the class file parser loads line number tables")    \
1219                                                                             \
1220   develop(bool, LoadLocalVariableTables, true,                              \
1221           "Tell whether the class file parser loads local variable tables") \
1222                                                                             \
1223   develop(bool, LoadLocalVariableTypeTables, true,                          \
1224           "Tell whether the class file parser loads local variable type"    \
1225           "tables")                                                         \
1226                                                                             \
1227   product(bool, AllowUserSignalHandlers, false,                             \
1228           "Do not complain if the application installs signal handlers "    \
1229           "(Solaris & Linux only)")                                         \
1230                                                                             \
1231   product(bool, UseSignalChaining, true,                                    \
1232           "Use signal-chaining to invoke signal handlers installed "        \
1233           "by the application (Solaris & Linux only)")                      \
1234                                                                             \
1235   product(bool, AllowJNIEnvProxy, false,                                    \
1236           "Allow JNIEnv proxies for jdbx")                                  \
1237                                                                             \
1238   product(bool, RestoreMXCSROnJNICalls, false,                              \
1239           "Restore MXCSR when returning from JNI calls")                    \
1240                                                                             \
1241   product(bool, CheckJNICalls, false,                                       \
1242           "Verify all arguments to JNI calls")                              \
1243                                                                             \
1244   product(bool, CheckEndorsedAndExtDirs, false,                             \
1245           "Verify the endorsed and extension directories are not used")     \
1246                                                                             \
1247   product(bool, UseFastJNIAccessors, true,                                  \
1248           "Use optimized versions of Get<Primitive>Field")                  \
1249                                                                             \
1250   product(intx, MaxJNILocalCapacity, 65536,                                 \
1251           "Maximum allowable local JNI handle capacity to "                 \
1252           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1253           "where <= 0 is unlimited, default: 65536")                        \
1254           range(min_intx, max_intx)                                         \
1255                                                                             \
1256   product(bool, EagerXrunInit, false,                                       \
1257           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1258           "but not all -Xrun libraries may support the state of the VM "    \
1259           "at this time")                                                   \
1260                                                                             \
1261   product(bool, PreserveAllAnnotations, false,                              \
1262           "Preserve RuntimeInvisibleAnnotations as well "                   \
1263           "as RuntimeVisibleAnnotations")                                   \
1264                                                                             \
1265   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1266           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1267                                                                             \
1268   product(bool, UseXMMForArrayCopy, false,                                  \
1269           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1270                                                                             \
1271   product(intx, FieldsAllocationStyle, 1,                                   \
1272           "0 - type based with oops first, "                                \
1273           "1 - with oops last, "                                            \
1274           "2 - oops in super and sub classes are together")                 \
1275           range(0, 2)                                                       \
1276                                                                             \
1277   product(bool, CompactFields, true,                                        \
1278           "Allocate nonstatic fields in gaps between previous fields")      \
1279                                                                             \
1280   notproduct(bool, PrintFieldLayout, false,                                 \
1281           "Print field layout for each class")                              \
1282                                                                             \
1283   /* Need to limit the extent of the padding to reasonable size.          */\
1284   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1285   /* aggressive prefetching, while still leaving the room for segregating */\
1286   /* among the distinct pages.                                            */\
1287   product(intx, ContendedPaddingWidth, 128,                                 \
1288           "How many bytes to pad the fields/classes marked @Contended with")\
1289           range(0, 8192)                                                    \
1290           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1291                                                                             \
1292   product(bool, EnableContended, true,                                      \
1293           "Enable @Contended annotation support")                           \
1294                                                                             \
1295   product(bool, RestrictContended, true,                                    \
1296           "Restrict @Contended to trusted classes")                         \
1297                                                                             \
1298   product(bool, UseBiasedLocking, true,                                     \
1299           "Enable biased locking in JVM")                                   \
1300                                                                             \
1301   product(intx, BiasedLockingStartupDelay, 0,                               \
1302           "Number of milliseconds to wait before enabling biased locking")  \
1303           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1304           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1305                                                                             \
1306   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1307           "Print statistics of biased locking in JVM")                      \
1308                                                                             \
1309   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1310           "Threshold of number of revocations per type to try to "          \
1311           "rebias all objects in the heap of that type")                    \
1312           range(0, max_intx)                                                \
1313           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1314                                                                             \
1315   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1316           "Threshold of number of revocations per type to permanently "     \
1317           "revoke biases of all objects in the heap of that type")          \
1318           range(0, max_intx)                                                \
1319           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1320                                                                             \
1321   product(intx, BiasedLockingDecayTime, 25000,                              \
1322           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1323           "type after previous bulk rebias")                                \
1324           range(500, max_intx)                                              \
1325           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1326                                                                             \
1327   product(bool, ExitOnOutOfMemoryError, false,                              \
1328           "JVM exits on the first occurrence of an out-of-memory error")    \
1329                                                                             \
1330   product(bool, CrashOnOutOfMemoryError, false,                             \
1331           "JVM aborts, producing an error log and core/mini dump, on the "  \
1332           "first occurrence of an out-of-memory error")                     \
1333                                                                             \
1334   /* tracing */                                                             \
1335                                                                             \
1336   develop(bool, StressRewriter, false,                                      \
1337           "Stress linktime bytecode rewriting")                             \
1338                                                                             \
1339   product(ccstr, TraceJVMTI, NULL,                                          \
1340           "Trace flags for JVMTI functions and events")                     \
1341                                                                             \
1342   /* This option can change an EMCP method into an obsolete method. */      \
1343   /* This can affect tests that except specific methods to be EMCP. */      \
1344   /* This option should be used with caution.                       */      \
1345   product(bool, StressLdcRewrite, false,                                    \
1346           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1347                                                                             \
1348   /* change to false by default sometime after Mustang */                   \
1349   product(bool, VerifyMergedCPBytecodes, true,                              \
1350           "Verify bytecodes after RedefineClasses constant pool merging")   \
1351                                                                             \
1352   develop(bool, TraceBytecodes, false,                                      \
1353           "Trace bytecode execution")                                       \
1354                                                                             \
1355   develop(bool, TraceICs, false,                                            \
1356           "Trace inline cache changes")                                     \
1357                                                                             \
1358   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1359           "Trace method invocation counter overflow")                       \
1360                                                                             \
1361   develop(bool, TraceInlineCacheClearing, false,                            \
1362           "Trace clearing of inline caches in nmethods")                    \
1363                                                                             \
1364   develop(bool, TraceDependencies, false,                                   \
1365           "Trace dependencies")                                             \
1366                                                                             \
1367   develop(bool, VerifyDependencies, trueInDebug,                            \
1368           "Exercise and verify the compilation dependency mechanism")       \
1369                                                                             \
1370   develop(bool, TraceNewOopMapGeneration, false,                            \
1371           "Trace OopMapGeneration")                                         \
1372                                                                             \
1373   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1374           "Trace OopMapGeneration: print detailed cell states")             \
1375                                                                             \
1376   develop(bool, TimeOopMap, false,                                          \
1377           "Time calls to GenerateOopMap::compute_map() in sum")             \
1378                                                                             \
1379   develop(bool, TimeOopMap2, false,                                         \
1380           "Time calls to GenerateOopMap::compute_map() individually")       \
1381                                                                             \
1382   develop(bool, TraceOopMapRewrites, false,                                 \
1383           "Trace rewriting of method oops during oop map generation")       \
1384                                                                             \
1385   develop(bool, TraceICBuffer, false,                                       \
1386           "Trace usage of IC buffer")                                       \
1387                                                                             \
1388   develop(bool, TraceCompiledIC, false,                                     \
1389           "Trace changes of compiled IC")                                   \
1390                                                                             \
1391   /* gc */                                                                  \
1392                                                                             \
1393   product(bool, UseSerialGC, false,                                         \
1394           "Use the Serial garbage collector")                               \
1395                                                                             \
1396   product(bool, UseG1GC, false,                                             \
1397           "Use the Garbage-First garbage collector")                        \
1398                                                                             \
1399   product(bool, UseParallelGC, false,                                       \
1400           "Use the Parallel Scavenge garbage collector")                    \
1401                                                                             \
1402   product(bool, UseParallelOldGC, false,                                    \
1403           "Use the Parallel Old garbage collector")                         \
1404                                                                             \
1405   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1406           "How often should we maximally compact the heap (not allowing "   \
1407           "any dead space)")                                                \
1408           range(0, max_uintx)                                               \
1409                                                                             \
1410   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1411           "The collection count for the first maximum compaction")          \
1412           range(0, max_uintx)                                               \
1413                                                                             \
1414   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1415           "Use maximum compaction in the Parallel Old garbage collector "   \
1416           "for a system GC")                                                \
1417                                                                             \
1418   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1419           "The mean used by the parallel compact dead wood "                \
1420           "limiter (a number between 0-100)")                               \
1421           range(0, 100)                                                     \
1422                                                                             \
1423   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1424           "The standard deviation used by the parallel compact dead wood "  \
1425           "limiter (a number between 0-100)")                               \
1426           range(0, 100)                                                     \
1427                                                                             \
1428   product(uint, ParallelGCThreads, 0,                                       \
1429           "Number of parallel threads parallel gc will use")                \
1430           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1431                                                                             \
1432   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1433             "Use semaphore synchronization for the GC Threads, "            \
1434             "instead of synchronization based on mutexes")                  \
1435                                                                             \
1436   product(bool, UseDynamicNumberOfGCThreads, true,                          \
1437           "Dynamically choose the number of threads up to a maximum of "    \
1438           "ParallelGCThreads parallel collectors will use for garbage "     \
1439           "collection work")                                                \
1440                                                                             \
1441   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1442              "Inject thread creation failures for "                         \
1443              "UseDynamicNumberOfGCThreads")                                 \
1444                                                                             \
1445   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1446           "Force dynamic selection of the number of "                       \
1447           "parallel threads parallel gc will use to aid debugging")         \
1448                                                                             \
1449   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1450           "Size of heap (bytes) per GC thread used in calculating the "     \
1451           "number of GC threads")                                           \
1452           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1453                                                                             \
1454   product(uint, ConcGCThreads, 0,                                           \
1455           "Number of threads concurrent gc will use")                       \
1456           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1457                                                                             \
1458   product(uint, GCTaskTimeStampEntries, 200,                                \
1459           "Number of time stamp entries per gc worker thread")              \
1460           range(1, max_jint)                                                \
1461                                                                             \
1462   product(bool, AlwaysTenure, false,                                        \
1463           "Always tenure objects in eden (ParallelGC only)")                \
1464                                                                             \
1465   product(bool, NeverTenure, false,                                         \
1466           "Never tenure objects in eden, may tenure on overflow "           \
1467           "(ParallelGC only)")                                              \
1468                                                                             \
1469   product(bool, ScavengeBeforeFullGC, true,                                 \
1470           "Scavenge youngest generation before each full GC.")              \
1471                                                                             \
1472   product(bool, UseConcMarkSweepGC, false,                                  \
1473           "Use Concurrent Mark-Sweep GC in the old generation")             \
1474                                                                             \
1475   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1476           "A System.gc() request invokes a concurrent collection; "         \
1477           "(effective only when using concurrent collectors)")              \
1478                                                                             \
1479   product(bool, GCLockerInvokesConcurrent, false,                           \
1480           "The exit of a JNI critical section necessitating a scavenge, "   \
1481           "also kicks off a background concurrent collection")              \
1482                                                                             \
1483   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1484           "How much the GC can expand the eden by while the GC locker "     \
1485           "is active (as a percentage)")                                    \
1486           range(0, 100)                                                     \
1487                                                                             \
1488   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1489           "Number of times to retry allocations when "                      \
1490           "blocked by the GC locker")                                       \
1491           range(0, max_uintx)                                               \
1492                                                                             \
1493   product(bool, UseCMSBestFit, true,                                        \
1494           "Use CMS best fit allocation strategy")                           \
1495                                                                             \
1496   product(uintx, ParallelGCBufferWastePct, 10,                              \
1497           "Wasted fraction of parallel allocation buffer")                  \
1498           range(0, 100)                                                     \
1499                                                                             \
1500   product(uintx, TargetPLABWastePct, 10,                                    \
1501           "Target wasted space in last buffer as percent of overall "       \
1502           "allocation")                                                     \
1503           range(1, 100)                                                     \
1504                                                                             \
1505   product(uintx, PLABWeight, 75,                                            \
1506           "Percentage (0-100) used to weight the current sample when "      \
1507           "computing exponentially decaying average for ResizePLAB")        \
1508           range(0, 100)                                                     \
1509                                                                             \
1510   product(bool, ResizePLAB, true,                                           \
1511           "Dynamically resize (survivor space) promotion LAB's")            \
1512                                                                             \
1513   product(int, ParGCArrayScanChunk, 50,                                     \
1514           "Scan a subset of object array and push remainder, if array is "  \
1515           "bigger than this")                                               \
1516           range(1, max_jint/3)                                              \
1517                                                                             \
1518   product(bool, ParGCUseLocalOverflow, false,                               \
1519           "Instead of a global overflow list, use local overflow stacks")   \
1520                                                                             \
1521   product(bool, ParGCTrimOverflow, true,                                    \
1522           "Eagerly trim the local overflow lists "                          \
1523           "(when ParGCUseLocalOverflow)")                                   \
1524                                                                             \
1525   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1526           "Simulate work queue overflow in ParNew")                         \
1527                                                                             \
1528   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1529           "An `interval' counter that determines how frequently "           \
1530           "we simulate overflow; a smaller number increases frequency")     \
1531                                                                             \
1532   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1533           "The desired number of objects to claim from the overflow list")  \
1534           range(0, max_uintx)                                               \
1535                                                                             \
1536   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1537           "The number of strides per worker thread that we divide up the "  \
1538           "card table scanning work into")                                  \
1539           range(1, max_uintx)                                               \
1540           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1541                                                                             \
1542   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1543           "The number of cards in each chunk of the parallel chunks used "  \
1544           "during card table scanning")                                     \
1545           range(1, max_intx)                                                \
1546           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1547                                                                             \
1548   product(uintx, OldPLABWeight, 50,                                         \
1549           "Percentage (0-100) used to weight the current sample when "      \
1550           "computing exponentially decaying average for resizing "          \
1551           "OldPLABSize")                                                    \
1552           range(0, 100)                                                     \
1553                                                                             \
1554   product(bool, ResizeOldPLAB, true,                                        \
1555           "Dynamically resize (old gen) promotion LAB's")                   \
1556                                                                             \
1557   product(size_t, CMSOldPLABMax, 1024,                                      \
1558           "Maximum size of CMS gen promotion LAB caches per worker "        \
1559           "per block size")                                                 \
1560           range(1, max_uintx)                                               \
1561           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1562                                                                             \
1563   product(size_t, CMSOldPLABMin, 16,                                        \
1564           "Minimum size of CMS gen promotion LAB caches per worker "        \
1565           "per block size")                                                 \
1566           range(1, max_uintx)                                               \
1567           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1568                                                                             \
1569   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1570           "Nominal number of refills of CMS gen promotion LAB cache "       \
1571           "per worker per block size")                                      \
1572           range(1, max_uintx)                                               \
1573                                                                             \
1574   product(bool, CMSOldPLABResizeQuicker, false,                             \
1575           "React on-the-fly during a scavenge to a sudden "                 \
1576           "change in block demand rate")                                    \
1577                                                                             \
1578   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1579           "The tolerance of the phase-change detector for on-the-fly "      \
1580           "PLAB resizing during a scavenge")                                \
1581           range(1, max_uintx)                                               \
1582                                                                             \
1583   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1584           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1585           "during a scavenge")                                              \
1586           range(1, max_uintx)                                               \
1587                                                                             \
1588   product(bool, AlwaysPreTouch, false,                                      \
1589           "Force all freshly committed pages to be pre-touched")            \
1590                                                                             \
1591   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1592           "Per-thread chunk size for parallel memory pre-touch.")           \
1593           range(1, SIZE_MAX / 2)                                            \
1594                                                                             \
1595   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1596           "The maximum size of young gen chosen by default per GC worker "  \
1597           "thread available")                                               \
1598           range(1, max_uintx)                                               \
1599                                                                             \
1600   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1601           "Percentage (0-100) used to add conservatism when computing the " \
1602           "duty cycle")                                                     \
1603           range(0, 100)                                                     \
1604                                                                             \
1605   product(uintx, CMSExpAvgFactor, 50,                                       \
1606           "Percentage (0-100) used to weight the current sample when "      \
1607           "computing exponential averages for CMS statistics")              \
1608           range(0, 100)                                                     \
1609                                                                             \
1610   product(uintx, CMS_FLSWeight, 75,                                         \
1611           "Percentage (0-100) used to weight the current sample when "      \
1612           "computing exponentially decaying averages for CMS FLS "          \
1613           "statistics")                                                     \
1614           range(0, 100)                                                     \
1615                                                                             \
1616   product(uintx, CMS_FLSPadding, 1,                                         \
1617           "The multiple of deviation from mean to use for buffering "       \
1618           "against volatility in free list demand")                         \
1619           range(0, max_juint)                                               \
1620                                                                             \
1621   product(uintx, FLSCoalescePolicy, 2,                                      \
1622           "CMS: aggressiveness level for coalescing, increasing "           \
1623           "from 0 to 4")                                                    \
1624           range(0, 4)                                                       \
1625                                                                             \
1626   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1627           "CMS: larger free blocks are always available for coalescing")    \
1628                                                                             \
1629   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1630           "CMS: the smaller the percentage the greater the coalescing "     \
1631           "force")                                                          \
1632           range(0.0, 1.0)                                                   \
1633                                                                             \
1634   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1635           "CMS: the factor by which to inflate estimated demand of small "  \
1636           "block sizes to prevent coalescing with an adjoining block")      \
1637           range(0.0, DBL_MAX)                                               \
1638                                                                             \
1639   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1640           "CMS: the factor by which to inflate estimated demand of large "  \
1641           "block sizes to prevent coalescing with an adjoining block")      \
1642           range(0.0, DBL_MAX)                                               \
1643                                                                             \
1644   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1645           "CMS: the factor by which to inflate estimated demand of small "  \
1646           "block sizes to prevent splitting to supply demand for smaller "  \
1647           "blocks")                                                         \
1648           range(0.0, DBL_MAX)                                               \
1649                                                                             \
1650   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1651           "CMS: the factor by which to inflate estimated demand of large "  \
1652           "block sizes to prevent splitting to supply demand for smaller "  \
1653           "blocks")                                                         \
1654           range(0.0, DBL_MAX)                                               \
1655                                                                             \
1656   product(bool, CMSExtrapolateSweep, false,                                 \
1657           "CMS: cushion for block demand during sweep")                     \
1658                                                                             \
1659   product(uintx, CMS_SweepWeight, 75,                                       \
1660           "Percentage (0-100) used to weight the current sample when "      \
1661           "computing exponentially decaying average for inter-sweep "       \
1662           "duration")                                                       \
1663           range(0, 100)                                                     \
1664                                                                             \
1665   product(uintx, CMS_SweepPadding, 1,                                       \
1666           "The multiple of deviation from mean to use for buffering "       \
1667           "against volatility in inter-sweep duration")                     \
1668           range(0, max_juint)                                               \
1669                                                                             \
1670   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1671           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1672           "duration exceeds this threshold in milliseconds")                \
1673           range(0, max_uintx)                                               \
1674                                                                             \
1675   product(bool, CMSClassUnloadingEnabled, true,                             \
1676           "Whether class unloading enabled when using CMS GC")              \
1677                                                                             \
1678   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1679           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1680           "count for which classes may not be unloaded")                    \
1681           range(0, max_uintx)                                               \
1682                                                                             \
1683   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1684           "Replenish an indexed free list with this number of chunks")      \
1685           range(1, max_uintx)                                               \
1686                                                                             \
1687   product(bool, CMSReplenishIntermediate, true,                             \
1688           "Replenish all intermediate free-list caches")                    \
1689                                                                             \
1690   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1691           "When satisfying batched demand, split blocks from the "          \
1692           "IndexedFreeList whose size is a multiple of requested size")     \
1693                                                                             \
1694   product(bool, CMSLoopWarn, false,                                         \
1695           "Warn in case of excessive CMS looping")                          \
1696                                                                             \
1697   /* where does the range max value of (max_jint - 1) come from? */         \
1698   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1699           "Maximum size of marking stack")                                  \
1700           range(1, (max_jint - 1))                                          \
1701                                                                             \
1702   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1703           "Size of marking stack")                                          \
1704           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1705                                                                             \
1706   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1707           "Simulate frequent marking stack / work queue overflow")          \
1708                                                                             \
1709   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1710           "An \"interval\" counter that determines how frequently "         \
1711           "to simulate overflow; a smaller number increases frequency")     \
1712                                                                             \
1713   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1714           "Maximum number of abortable preclean iterations, if > 0")        \
1715           range(0, max_uintx)                                               \
1716                                                                             \
1717   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1718           "Maximum time in abortable preclean (in milliseconds)")           \
1719           range(0, max_intx)                                                \
1720                                                                             \
1721   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1722           "Nominal minimum work per abortable preclean iteration")          \
1723           range(0, max_uintx)                                               \
1724                                                                             \
1725   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1726           "Time that we sleep between iterations when not given "           \
1727           "enough work per iteration")                                      \
1728           range(0, max_intx)                                                \
1729                                                                             \
1730   /* 4096 = CardTable::card_size_in_words * BitsPerWord */                  \
1731   product(size_t, CMSRescanMultiple, 32,                                    \
1732           "Size (in cards) of CMS parallel rescan task")                    \
1733           range(1, SIZE_MAX / 4096)                                         \
1734           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1735                                                                             \
1736   /* 4096 = CardTable::card_size_in_words * BitsPerWord */                  \
1737   product(size_t, CMSConcMarkMultiple, 32,                                  \
1738           "Size (in cards) of CMS concurrent MT marking task")              \
1739           range(1, SIZE_MAX / 4096)                                         \
1740           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1741                                                                             \
1742   product(bool, CMSAbortSemantics, false,                                   \
1743           "Whether abort-on-overflow semantics is implemented")             \
1744                                                                             \
1745   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1746           "Use the parallel initial mark.")                                 \
1747                                                                             \
1748   product(bool, CMSParallelRemarkEnabled, true,                             \
1749           "Whether parallel remark enabled (only if ParNewGC)")             \
1750                                                                             \
1751   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1752           "Whether parallel remark of survivor space "                      \
1753           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1754                                                                             \
1755   product(bool, CMSPLABRecordAlways, true,                                  \
1756           "Always record survivor space PLAB boundaries (effective only "   \
1757           "if CMSParallelSurvivorRemarkEnabled)")                           \
1758                                                                             \
1759   product(bool, CMSEdenChunksRecordAlways, true,                            \
1760           "Always record eden chunks used for the parallel initial mark "   \
1761           "or remark of eden")                                              \
1762                                                                             \
1763   product(bool, CMSConcurrentMTEnabled, true,                               \
1764           "Whether multi-threaded concurrent work enabled "                 \
1765           "(effective only if ParNewGC)")                                   \
1766                                                                             \
1767   product(bool, CMSPrecleaningEnabled, true,                                \
1768           "Whether concurrent precleaning enabled")                         \
1769                                                                             \
1770   product(uintx, CMSPrecleanIter, 3,                                        \
1771           "Maximum number of precleaning iteration passes")                 \
1772           range(0, 9)                                                       \
1773                                                                             \
1774   product(uintx, CMSPrecleanDenominator, 3,                                 \
1775           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1776           "ratio")                                                          \
1777           range(1, max_uintx)                                               \
1778           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1779                                                                             \
1780   product(uintx, CMSPrecleanNumerator, 2,                                   \
1781           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1782           "ratio")                                                          \
1783           range(0, max_uintx-1)                                             \
1784           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1785                                                                             \
1786   product(bool, CMSPrecleanRefLists1, true,                                 \
1787           "Preclean ref lists during (initial) preclean phase")             \
1788                                                                             \
1789   product(bool, CMSPrecleanRefLists2, false,                                \
1790           "Preclean ref lists during abortable preclean phase")             \
1791                                                                             \
1792   product(bool, CMSPrecleanSurvivors1, false,                               \
1793           "Preclean survivors during (initial) preclean phase")             \
1794                                                                             \
1795   product(bool, CMSPrecleanSurvivors2, true,                                \
1796           "Preclean survivors during abortable preclean phase")             \
1797                                                                             \
1798   product(uintx, CMSPrecleanThreshold, 1000,                                \
1799           "Do not iterate again if number of dirty cards is less than this")\
1800           range(100, max_uintx)                                             \
1801                                                                             \
1802   product(bool, CMSCleanOnEnter, true,                                      \
1803           "Clean-on-enter optimization for reducing number of dirty cards") \
1804                                                                             \
1805   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1806           "Choose variant (1,2) of verification following remark")          \
1807           range(1, 2)                                                       \
1808                                                                             \
1809   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1810           "If Eden size is below this, do not try to schedule remark")      \
1811           range(0, max_uintx)                                               \
1812                                                                             \
1813   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1814           "The Eden occupancy percentage (0-100) at which "                 \
1815           "to try and schedule remark pause")                               \
1816           range(0, 100)                                                     \
1817                                                                             \
1818   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1819           "Start sampling eden top at least before young gen "              \
1820           "occupancy reaches 1/<ratio> of the size at which "               \
1821           "we plan to schedule remark")                                     \
1822           range(1, max_uintx)                                               \
1823                                                                             \
1824   product(uintx, CMSSamplingGrain, 16*K,                                    \
1825           "The minimum distance between eden samples for CMS (see above)")  \
1826           range(ObjectAlignmentInBytes, max_uintx)                          \
1827           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1828                                                                             \
1829   product(bool, CMSScavengeBeforeRemark, false,                             \
1830           "Attempt scavenge before the CMS remark step")                    \
1831                                                                             \
1832   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1833           "Don't drain below this size per parallel worker/thief")          \
1834           range(1, max_juint)                                               \
1835           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1836                                                                             \
1837   manageable(intx, CMSWaitDuration, 2000,                                   \
1838           "Time in milliseconds that CMS thread waits for young GC")        \
1839           range(min_jint, max_jint)                                         \
1840                                                                             \
1841   develop(uintx, CMSCheckInterval, 1000,                                    \
1842           "Interval in milliseconds that CMS thread checks if it "          \
1843           "should start a collection cycle")                                \
1844                                                                             \
1845   product(bool, CMSYield, true,                                             \
1846           "Yield between steps of CMS")                                     \
1847                                                                             \
1848   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1849           "Bitmap operations should process at most this many bits "        \
1850           "between yields")                                                 \
1851           range(1, max_uintx)                                               \
1852           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1853                                                                             \
1854   product(bool, CMSPrintChunksInDump, false,                                \
1855           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1856           "trace level include more detailed information about the"         \
1857           "free chunks")                \
1858                                                                             \
1859   product(bool, CMSPrintObjectsInDump, false,                               \
1860           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1861           "trace level include more detailed information about the"         \
1862           "allocated objects")                                              \
1863                                                                             \
1864   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1865           "Verify that all references across the FLS boundary "             \
1866           "are to valid objects")                                           \
1867                                                                             \
1868   diagnostic(bool, FLSVerifyLists, false,                                   \
1869           "Do lots of (expensive) FreeListSpace verification")              \
1870                                                                             \
1871   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1872           "Do lots of (expensive) FLS index table verification")            \
1873                                                                             \
1874   develop(bool, FLSVerifyDictionary, false,                                 \
1875           "Do lots of (expensive) FLS dictionary verification")             \
1876                                                                             \
1877   develop(bool, VerifyBlockOffsetArray, false,                              \
1878           "Do (expensive) block offset array verification")                 \
1879                                                                             \
1880   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1881           "Maintain _unallocated_block in BlockOffsetArray "                \
1882           "(currently applicable only to CMS collector)")                   \
1883                                                                             \
1884   product(intx, RefDiscoveryPolicy, 0,                                      \
1885           "Select type of reference discovery policy: "                     \
1886           "reference-based(0) or referent-based(1)")                        \
1887           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1888                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1889                                                                             \
1890   product(bool, ParallelRefProcEnabled, false,                              \
1891           "Enable parallel reference processing whenever possible")         \
1892                                                                             \
1893   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1894           "Enable balancing of reference processing queues")                \
1895                                                                             \
1896   product(uintx, CMSTriggerRatio, 80,                                       \
1897           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1898           "allocated before a CMS collection cycle commences")              \
1899           range(0, 100)                                                     \
1900                                                                             \
1901   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1902           "Percentage CMS generation occupancy at which to "                \
1903           "initiate CMS collection for bootstrapping collection stats")     \
1904           range(0, 100)                                                     \
1905                                                                             \
1906   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1907           "Percentage CMS generation occupancy to start a CMS collection "  \
1908           "cycle. A negative value means that CMSTriggerRatio is used")     \
1909           range(min_intx, 100)                                              \
1910                                                                             \
1911   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1912           "The percent occupancy (IHOP) of the current old generation "     \
1913           "capacity above which a concurrent mark cycle will be initiated " \
1914           "Its value may change over time if adaptive IHOP is enabled, "    \
1915           "otherwise the value remains constant. "                          \
1916           "In the latter case a value of 0 will result as frequent as "     \
1917           "possible concurrent marking cycles. A value of 100 disables "    \
1918           "concurrent marking. "                                            \
1919           "Fragmentation waste in the old generation is not considered "    \
1920           "free space in this calculation. (G1 collector only)")            \
1921           range(0, 100)                                                     \
1922                                                                             \
1923   manageable(intx, CMSTriggerInterval, -1,                                  \
1924           "Commence a CMS collection cycle (at least) every so many "       \
1925           "milliseconds (0 permanently, -1 disabled)")                      \
1926           range(-1, max_intx)                                               \
1927                                                                             \
1928   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1929           "Only use occupancy as a criterion for starting a CMS collection")\
1930                                                                             \
1931   product(uintx, CMSIsTooFullPercentage, 98,                                \
1932           "An absolute ceiling above which CMS will always consider the "   \
1933           "unloading of classes when class unloading is enabled")           \
1934           range(0, 100)                                                     \
1935                                                                             \
1936   develop(bool, CMSTestInFreeList, false,                                   \
1937           "Check if the coalesced range is already in the "                 \
1938           "free lists as claimed")                                          \
1939                                                                             \
1940   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1941           "Check that all the garbage collected was returned to the "       \
1942           "free lists")                                                     \
1943                                                                             \
1944   notproduct(bool, ScavengeALot, false,                                     \
1945           "Force scavenge at every Nth exit from the runtime system "       \
1946           "(N=ScavengeALotInterval)")                                       \
1947                                                                             \
1948   develop(bool, FullGCALot, false,                                          \
1949           "Force full gc at every Nth exit from the runtime system "        \
1950           "(N=FullGCALotInterval)")                                         \
1951                                                                             \
1952   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1953           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1954                                                                             \
1955   notproduct(bool, PromotionFailureALot, false,                             \
1956           "Use promotion failure handling on every youngest generation "    \
1957           "collection")                                                     \
1958                                                                             \
1959   develop(uintx, PromotionFailureALotCount, 1000,                           \
1960           "Number of promotion failures occurring at PLAB "                 \
1961           "refill attempts (ParNew) or promotion attempts "                 \
1962           "(other young collectors)")                                       \
1963                                                                             \
1964   develop(uintx, PromotionFailureALotInterval, 5,                           \
1965           "Total collections between promotion failures a lot")             \
1966                                                                             \
1967   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1968           "Sleep time when sleep is used for yields")                       \
1969                                                                             \
1970   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1971           "Number of yields before a sleep is done during work stealing")   \
1972                                                                             \
1973   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1974           "Number of iterations in a spin loop between checks on "          \
1975           "time out of hard spin")                                          \
1976                                                                             \
1977   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1978           "Ratio of hard spins to calls to yield")                          \
1979                                                                             \
1980   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1981           "Number of object array elements to push onto the marking stack " \
1982           "before pushing a continuation entry")                            \
1983                                                                             \
1984   develop(bool, MetadataAllocationFailALot, false,                          \
1985           "Fail metadata allocations at intervals controlled by "           \
1986           "MetadataAllocationFailALotInterval")                             \
1987                                                                             \
1988   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1989           "Metadata allocation failure a lot interval")                     \
1990                                                                             \
1991   notproduct(bool, ExecuteInternalVMTests, false,                           \
1992           "Enable execution of internal VM tests")                          \
1993                                                                             \
1994   notproduct(bool, VerboseInternalVMTests, false,                           \
1995           "Turn on logging for internal VM tests.")                         \
1996                                                                             \
1997   product(bool, ExecutingUnitTests, false,                                  \
1998           "Whether the JVM is running unit tests or not")                   \
1999                                                                             \
2000   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2001                                                                             \
2002   product_pd(bool, ResizeTLAB,                                              \
2003           "Dynamically resize TLAB size for threads")                       \
2004                                                                             \
2005   product(bool, ZeroTLAB, false,                                            \
2006           "Zero out the newly created TLAB")                                \
2007                                                                             \
2008   product(bool, TLABStats, true,                                            \
2009           "Provide more detailed and expensive TLAB statistics.")           \
2010                                                                             \
2011   product_pd(bool, NeverActAsServerClassMachine,                            \
2012           "Never act like a server-class machine")                          \
2013                                                                             \
2014   product(bool, AlwaysActAsServerClassMachine, false,                       \
2015           "Always act like a server-class machine")                         \
2016                                                                             \
2017   product_pd(uint64_t, MaxRAM,                                              \
2018           "Real memory size (in bytes) used to set maximum heap size")      \
2019           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2020                                                                             \
2021   product(bool, AggressiveHeap, false,                                      \
2022           "Optimize heap options for long-running memory intensive apps")   \
2023                                                                             \
2024   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2025           "Maximum ergonomically set heap size (in bytes); zero means use " \
2026           "MaxRAM * MaxRAMPercentage / 100")                                \
2027           range(0, max_uintx)                                               \
2028                                                                             \
2029   product(uintx, MaxRAMFraction, 4,                                         \
2030           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2031           "size. "                                                          \
2032           "Deprecated, use MaxRAMPercentage instead")                       \
2033           range(1, max_uintx)                                               \
2034                                                                             \
2035   product(uintx, MinRAMFraction, 2,                                         \
2036           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2037           "size on systems with small physical memory size. "               \
2038           "Deprecated, use MinRAMPercentage instead")                       \
2039           range(1, max_uintx)                                               \
2040                                                                             \
2041   product(uintx, InitialRAMFraction, 64,                                    \
2042           "Fraction (1/n) of real memory used for initial heap size. "      \
2043           "Deprecated, use InitialRAMPercentage instead")                   \
2044           range(1, max_uintx)                                               \
2045                                                                             \
2046   product(double, MaxRAMPercentage, 25.0,                                   \
2047           "Maximum percentage of real memory used for maximum heap size")   \
2048           range(0.0, 100.0)                                                 \
2049                                                                             \
2050   product(double, MinRAMPercentage, 50.0,                                   \
2051           "Minimum percentage of real memory used for maximum heap"         \
2052           "size on systems with small physical memory size")                \
2053           range(0.0, 100.0)                                                 \
2054                                                                             \
2055   product(double, InitialRAMPercentage, 1.5625,                             \
2056           "Percentage of real memory used for initial heap size")           \
2057           range(0.0, 100.0)                                                 \
2058                                                                             \
2059   product(int, ActiveProcessorCount, -1,                                    \
2060           "Specify the CPU count the VM should use and report as active")   \
2061                                                                             \
2062   develop(uintx, MaxVirtMemFraction, 2,                                     \
2063           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2064           "determining maximum heap size")                                  \
2065                                                                             \
2066   product(bool, UseAdaptiveSizePolicy, true,                                \
2067           "Use adaptive generation sizing policies")                        \
2068                                                                             \
2069   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2070           "Use adaptive survivor sizing policies")                          \
2071                                                                             \
2072   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2073           "Use adaptive young-old sizing policies at minor collections")    \
2074                                                                             \
2075   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2076           "Use adaptive young-old sizing policies at major collections")    \
2077                                                                             \
2078   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2079           "Include statistics from System.gc() for adaptive size policy")   \
2080                                                                             \
2081   product(bool, UseAdaptiveGCBoundary, false,                               \
2082           "Allow young-old boundary to move")                               \
2083                                                                             \
2084   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2085           "Resize the virtual spaces of the young or old generations")      \
2086           range(-1, 1)                                                      \
2087                                                                             \
2088   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2089           "Policy for changing generation size for throughput goals")       \
2090           range(0, 1)                                                       \
2091                                                                             \
2092   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2093           "Number of steps where heuristics is used before data is used")   \
2094           range(0, max_uintx)                                               \
2095                                                                             \
2096   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2097           "Number of collections before the adaptive sizing is started")    \
2098                                                                             \
2099   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2100           "Collection interval for printing information; zero means never") \
2101           range(0, max_uintx)                                               \
2102                                                                             \
2103   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2104           "Use adaptive minimum footprint as a goal")                       \
2105                                                                             \
2106   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2107           "Weight given to exponential resizing, between 0 and 100")        \
2108           range(0, 100)                                                     \
2109                                                                             \
2110   product(uintx, AdaptiveTimeWeight,       25,                              \
2111           "Weight given to time in adaptive policy, between 0 and 100")     \
2112           range(0, 100)                                                     \
2113                                                                             \
2114   product(uintx, PausePadding, 1,                                           \
2115           "How much buffer to keep for pause time")                         \
2116           range(0, max_juint)                                               \
2117                                                                             \
2118   product(uintx, PromotedPadding, 3,                                        \
2119           "How much buffer to keep for promotion failure")                  \
2120           range(0, max_juint)                                               \
2121                                                                             \
2122   product(uintx, SurvivorPadding, 3,                                        \
2123           "How much buffer to keep for survivor overflow")                  \
2124           range(0, max_juint)                                               \
2125                                                                             \
2126   product(uintx, ThresholdTolerance, 10,                                    \
2127           "Allowed collection cost difference between generations")         \
2128           range(0, 100)                                                     \
2129                                                                             \
2130   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2131           "If collection costs are within margin, reduce both by full "     \
2132           "delta")                                                          \
2133           range(0, 100)                                                     \
2134                                                                             \
2135   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2136           "Adaptive size percentage change in young generation")            \
2137           range(0, 100)                                                     \
2138                                                                             \
2139   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2140           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2141           range(0, 100)                                                     \
2142                                                                             \
2143   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2144           "Decay factor to YoungedGenerationSizeSupplement")                \
2145           range(1, max_uintx)                                               \
2146                                                                             \
2147   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2148           "Adaptive size percentage change in tenured generation")          \
2149           range(0, 100)                                                     \
2150                                                                             \
2151   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2152           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2153           range(0, 100)                                                     \
2154                                                                             \
2155   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2156           "Decay factor to TenuredGenerationSizeIncrement")                 \
2157           range(1, max_uintx)                                               \
2158                                                                             \
2159   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2160           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2161           "or (G1 Only) the maximum GC time per MMU time slice")            \
2162           range(1, max_uintx - 1)                                           \
2163           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2164                                                                             \
2165   product(uintx, GCPauseIntervalMillis, 0,                                  \
2166           "Time slice for MMU specification")                               \
2167           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2168                                                                             \
2169   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2170           "Adaptive size policy maximum GC minor pause time goal "          \
2171           "in millisecond")                                                 \
2172           range(0, max_uintx)                                               \
2173                                                                             \
2174   product(uintx, GCTimeRatio, 99,                                           \
2175           "Adaptive size policy application time to GC time ratio")         \
2176           range(0, max_juint)                                               \
2177                                                                             \
2178   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2179           "Adaptive size scale down factor for shrinking")                  \
2180           range(1, max_uintx)                                               \
2181                                                                             \
2182   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2183           "Adaptive size decays the major cost for long major intervals")   \
2184                                                                             \
2185   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2186           "Time scale over which major costs decay")                        \
2187           range(0, max_uintx)                                               \
2188                                                                             \
2189   product(uintx, MinSurvivorRatio, 3,                                       \
2190           "Minimum ratio of young generation/survivor space size")          \
2191           range(3, max_uintx)                                               \
2192                                                                             \
2193   product(uintx, InitialSurvivorRatio, 8,                                   \
2194           "Initial ratio of young generation/survivor space size")          \
2195           range(0, max_uintx)                                               \
2196                                                                             \
2197   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2198           "Estimate of footprint other than Java Heap")                     \
2199           range(0, max_uintx)                                               \
2200                                                                             \
2201   product(bool, UseGCOverheadLimit, true,                                   \
2202           "Use policy to limit of proportion of time spent in GC "          \
2203           "before an OutOfMemory error is thrown")                          \
2204                                                                             \
2205   product(uintx, GCTimeLimit, 98,                                           \
2206           "Limit of the proportion of time spent in GC before "             \
2207           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2208           range(0, 100)                                                     \
2209                                                                             \
2210   product(uintx, GCHeapFreeLimit, 2,                                        \
2211           "Minimum percentage of free space after a full GC before an "     \
2212           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2213           range(0, 100)                                                     \
2214                                                                             \
2215   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2216           "Number of consecutive collections before gc time limit fires")   \
2217           range(1, max_uintx)                                               \
2218                                                                             \
2219   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2220           "How far ahead to prefetch destination area (<= 0 means off)")    \
2221           range(-1, max_jint)                                               \
2222                                                                             \
2223   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2224           "How far ahead to prefetch scan area (<= 0 means off)")           \
2225           range(-1, max_jint)                                               \
2226                                                                             \
2227   product(intx, PrefetchFieldsAhead, -1,                                    \
2228           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2229           range(-1, max_jint)                                               \
2230                                                                             \
2231   diagnostic(bool, VerifyDuringStartup, false,                              \
2232           "Verify memory system before executing any Java code "            \
2233           "during VM initialization")                                       \
2234                                                                             \
2235   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2236           "Verify system before exiting")                                   \
2237                                                                             \
2238   diagnostic(bool, VerifyBeforeGC, false,                                   \
2239           "Verify memory system before GC")                                 \
2240                                                                             \
2241   diagnostic(bool, VerifyAfterGC, false,                                    \
2242           "Verify memory system after GC")                                  \
2243                                                                             \
2244   diagnostic(bool, VerifyDuringGC, false,                                   \
2245           "Verify memory system during GC (between phases)")                \
2246                                                                             \
2247   diagnostic(ccstrlist, VerifyGCType, "",                                   \
2248              "GC type(s) to verify when Verify*GC is enabled."              \
2249              "Available types are collector specific.")                     \
2250                                                                             \
2251   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2252           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2253           "are enabled. One or more sub-systems can be specified "          \
2254           "in a comma separated string. Sub-systems are: "                  \
2255           "threads, heap, symbol_table, string_table, codecache, "          \
2256           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2257           "codecache_oops")                                                 \
2258                                                                             \
2259   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2260           "Enable parallel memory system verification")                     \
2261                                                                             \
2262   diagnostic(bool, DeferInitialCardMark, false,                             \
2263           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2264           "may arise from new_pre_store_barrier")                           \
2265                                                                             \
2266   product(bool, UseCondCardMark, false,                                     \
2267           "Check for already marked card before updating card table")       \
2268                                                                             \
2269   diagnostic(bool, VerifyRememberedSets, false,                             \
2270           "Verify GC remembered sets")                                      \
2271                                                                             \
2272   diagnostic(bool, VerifyObjectStartArray, true,                            \
2273           "Verify GC object start array if verify before/after")            \
2274                                                                             \
2275   product(bool, DisableExplicitGC, false,                                   \
2276           "Ignore calls to System.gc()")                                    \
2277                                                                             \
2278   notproduct(bool, CheckMemoryInitialization, false,                        \
2279           "Check memory initialization")                                    \
2280                                                                             \
2281   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2282           "Bind CMS Thread to CPU if possible")                             \
2283                                                                             \
2284   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2285           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2286           range(0, max_juint)                                               \
2287                                                                             \
2288   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2289           "Bind GCTaskThreads to CPUs if possible")                         \
2290                                                                             \
2291   product(bool, UseGCTaskAffinity, false,                                   \
2292           "Use worker affinity when asking for GCTasks")                    \
2293                                                                             \
2294   product(uintx, ProcessDistributionStride, 4,                              \
2295           "Stride through processors when distributing processes")          \
2296           range(0, max_juint)                                               \
2297                                                                             \
2298   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2299           "Number of times the coordinator GC thread will sleep while "     \
2300           "yielding before giving up and resuming GC")                      \
2301           range(0, max_juint)                                               \
2302                                                                             \
2303   product(uintx, CMSYieldSleepCount, 0,                                     \
2304           "Number of times a GC thread (minus the coordinator) "            \
2305           "will sleep while yielding before giving up and resuming GC")     \
2306           range(0, max_juint)                                               \
2307                                                                             \
2308   product(bool, PrintGC, false,                                             \
2309           "Print message at garbage collection. "                           \
2310           "Deprecated, use -Xlog:gc instead.")                              \
2311                                                                             \
2312   product(bool, PrintGCDetails, false,                                      \
2313           "Print more details at garbage collection. "                      \
2314           "Deprecated, use -Xlog:gc* instead.")                             \
2315                                                                             \
2316   develop(intx, ConcGCYieldTimeout, 0,                                      \
2317           "If non-zero, assert that GC threads yield within this "          \
2318           "number of milliseconds")                                         \
2319           range(0, max_intx)                                                \
2320                                                                             \
2321   develop(bool, TraceFinalizerRegistration, false,                          \
2322           "Trace registration of final references")                         \
2323                                                                             \
2324   notproduct(bool, TraceScavenge, false,                                    \
2325           "Trace scavenge")                                                 \
2326                                                                             \
2327   product(bool, IgnoreEmptyClassPaths, false,                               \
2328           "Ignore empty path elements in -classpath")                       \
2329                                                                             \
2330   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2331           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2332           "Initial size of the boot class loader data metaspace")           \
2333           range(30*K, max_uintx/BytesPerWord)                               \
2334           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2335                                                                             \
2336   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2337           "Print heap layout in response to SIGBREAK")                      \
2338                                                                             \
2339   manageable(bool, PrintClassHistogram, false,                              \
2340           "Print a histogram of class instances")                           \
2341                                                                             \
2342   develop(bool, TraceGCTaskManager, false,                                  \
2343           "Trace actions of the GC task manager")                           \
2344                                                                             \
2345   develop(bool, TraceGCTaskQueue, false,                                    \
2346           "Trace actions of the GC task queues")                            \
2347                                                                             \
2348   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2349           "Trace marking phase in ParallelOldGC")                           \
2350                                                                             \
2351   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2352           "Trace dense prefix computation for ParallelOldGC")               \
2353                                                                             \
2354   develop(bool, IgnoreLibthreadGPFault, false,                              \
2355           "Suppress workaround for libthread GP fault")                     \
2356                                                                             \
2357   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2358           "The percentage of the used heap that the instances of a class "  \
2359           "must occupy for the class to generate a trace event")            \
2360           range(0.0, 100.0)                                                 \
2361                                                                             \
2362   /* JVMTI heap profiling */                                                \
2363                                                                             \
2364   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2365           "Trace JVMTI object tagging calls")                               \
2366                                                                             \
2367   diagnostic(bool, VerifyBeforeIteration, false,                            \
2368           "Verify memory system before JVMTI iteration")                    \
2369                                                                             \
2370   /* compiler interface */                                                  \
2371                                                                             \
2372   develop(bool, CIPrintCompilerName, false,                                 \
2373           "when CIPrint is active, print the name of the active compiler")  \
2374                                                                             \
2375   diagnostic(bool, CIPrintCompileQueue, false,                              \
2376           "display the contents of the compile queue whenever a "           \
2377           "compilation is enqueued")                                        \
2378                                                                             \
2379   develop(bool, CIPrintRequests, false,                                     \
2380           "display every request for compilation")                          \
2381                                                                             \
2382   product(bool, CITime, false,                                              \
2383           "collect timing information for compilation")                     \
2384                                                                             \
2385   develop(bool, CITimeVerbose, false,                                       \
2386           "be more verbose in compilation timings")                         \
2387                                                                             \
2388   develop(bool, CITimeEach, false,                                          \
2389           "display timing information after each successful compilation")   \
2390                                                                             \
2391   develop(bool, CICountOSR, false,                                          \
2392           "use a separate counter when assigning ids to osr compilations")  \
2393                                                                             \
2394   develop(bool, CICompileNatives, true,                                     \
2395           "compile native methods if supported by the compiler")            \
2396                                                                             \
2397   develop_pd(bool, CICompileOSR,                                            \
2398           "compile on stack replacement methods if supported by the "       \
2399           "compiler")                                                       \
2400                                                                             \
2401   develop(bool, CIPrintMethodCodes, false,                                  \
2402           "print method bytecodes of the compiled code")                    \
2403                                                                             \
2404   develop(bool, CIPrintTypeFlow, false,                                     \
2405           "print the results of ciTypeFlow analysis")                       \
2406                                                                             \
2407   develop(bool, CITraceTypeFlow, false,                                     \
2408           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2409                                                                             \
2410   develop(intx, OSROnlyBCI, -1,                                             \
2411           "OSR only at this bci.  Negative values mean exclude that bci")   \
2412                                                                             \
2413   /* compiler */                                                            \
2414                                                                             \
2415   /* notice: the max range value here is max_jint, not max_intx  */         \
2416   /* because of overflow issue                                   */         \
2417   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2418           "Number of compiler threads to run")                              \
2419           range(0, max_jint)                                                \
2420           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2421                                                                             \
2422   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
2423           "Dynamically choose the number of parallel compiler threads")     \
2424                                                                             \
2425   diagnostic(bool, TraceCompilerThreads, false,                             \
2426              "Trace creation and removal of compiler threads")              \
2427                                                                             \
2428   diagnostic(bool, InjectCompilerCreationFailure, false,                    \
2429              "Inject thread creation failures for "                         \
2430              "UseDynamicNumberOfCompilerThreads")                           \
2431                                                                             \
2432   product(intx, CompilationPolicyChoice, 0,                                 \
2433           "which compilation policy (0-3)")                                 \
2434           range(0, 3)                                                       \
2435                                                                             \
2436   develop(bool, UseStackBanging, true,                                      \
2437           "use stack banging for stack overflow checks (required for "      \
2438           "proper StackOverflow handling; disable only to measure cost "    \
2439           "of stackbanging)")                                               \
2440                                                                             \
2441   develop(bool, UseStrictFP, true,                                          \
2442           "use strict fp if modifier strictfp is set")                      \
2443                                                                             \
2444   develop(bool, GenerateSynchronizationCode, true,                          \
2445           "generate locking/unlocking code for synchronized methods and "   \
2446           "monitors")                                                       \
2447                                                                             \
2448   develop(bool, GenerateRangeChecks, true,                                  \
2449           "Generate range checks for array accesses")                       \
2450                                                                             \
2451   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2452           "Generate code for implicit null checks")                         \
2453                                                                             \
2454   product_pd(bool, TrapBasedNullChecks,                                     \
2455           "Generate code for null checks that uses a cmp and trap "         \
2456           "instruction raising SIGTRAP.  This is only used if an access to" \
2457           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2458           "ImplicitNullChecks don't work (PPC64).")                         \
2459                                                                             \
2460   product(bool, PrintSafepointStatistics, false,                            \
2461           "(Deprecated) Print statistics about safepoint synchronization")  \
2462                                                                             \
2463   product(intx, PrintSafepointStatisticsCount, 300,                         \
2464           "(Deprecated) Total number of safepoint statistics collected "    \
2465           "before printing them out")                                       \
2466           range(1, max_intx)                                                \
2467                                                                             \
2468   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2469           "(Deprecated) Print safepoint statistics only when safepoint takes "  \
2470           "more than PrintSafepointSatisticsTimeout in millis")             \
2471   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2472   NOT_LP64(range(-1, max_intx))                                             \
2473                                                                             \
2474   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
2475              "Enable Thread SMR extra validity checks")                     \
2476                                                                             \
2477   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
2478              "Enable Thread SMR Statistics")                                \
2479                                                                             \
2480   product(bool, Inline, true,                                               \
2481           "Enable inlining")                                                \
2482                                                                             \
2483   product(bool, ClipInlining, true,                                         \
2484           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2485                                                                             \
2486   develop(bool, UseCHA, true,                                               \
2487           "Enable CHA")                                                     \
2488                                                                             \
2489   product(bool, UseTypeProfile, true,                                       \
2490           "Check interpreter profile for historically monomorphic calls")   \
2491                                                                             \
2492   diagnostic(bool, PrintInlining, false,                                    \
2493           "Print inlining optimizations")                                   \
2494                                                                             \
2495   product(bool, UsePopCountInstruction, false,                              \
2496           "Use population count instruction")                               \
2497                                                                             \
2498   develop(bool, EagerInitialization, false,                                 \
2499           "Eagerly initialize classes if possible")                         \
2500                                                                             \
2501   diagnostic(bool, LogTouchedMethods, false,                                \
2502           "Log methods which have been ever touched in runtime")            \
2503                                                                             \
2504   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2505           "Print all methods that have been ever touched in runtime")       \
2506                                                                             \
2507   develop(bool, TraceMethodReplacement, false,                              \
2508           "Print when methods are replaced do to recompilation")            \
2509                                                                             \
2510   develop(bool, PrintMethodFlushing, false,                                 \
2511           "Print the nmethods being flushed")                               \
2512                                                                             \
2513   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2514           "print statistics about method flushing")                         \
2515                                                                             \
2516   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2517           "Number of compiled code invocations after which "                \
2518           "the method is considered as hot by the flusher")                 \
2519           range(1, max_jint)                                                \
2520                                                                             \
2521   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2522           "Minimum number of sweeper passes before an nmethod "             \
2523           "can be flushed")                                                 \
2524           range(0, max_intx)                                                \
2525                                                                             \
2526   product(bool, UseCodeAging, true,                                         \
2527           "Insert counter to detect warm methods")                          \
2528                                                                             \
2529   diagnostic(bool, StressCodeAging, false,                                  \
2530           "Start with counters compiled in")                                \
2531                                                                             \
2532   develop(bool, StressCodeBuffers, false,                                   \
2533           "Exercise code buffer expansion and other rare state changes")    \
2534                                                                             \
2535   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2536           "Generate extra debugging information for non-safepoints in "     \
2537           "nmethods")                                                       \
2538                                                                             \
2539   product(bool, PrintVMOptions, false,                                      \
2540           "Print flags that appeared on the command line")                  \
2541                                                                             \
2542   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2543           "Ignore unrecognized VM options")                                 \
2544                                                                             \
2545   product(bool, PrintCommandLineFlags, false,                               \
2546           "Print flags specified on command line or set by ergonomics")     \
2547                                                                             \
2548   product(bool, PrintFlagsInitial, false,                                   \
2549           "Print all VM flags before argument processing and exit VM")      \
2550                                                                             \
2551   product(bool, PrintFlagsFinal, false,                                     \
2552           "Print all VM flags after argument and ergonomic processing")     \
2553                                                                             \
2554   notproduct(bool, PrintFlagsWithComments, false,                           \
2555           "Print all VM flags with default values and descriptions and "    \
2556           "exit")                                                           \
2557                                                                             \
2558   product(bool, PrintFlagsRanges, false,                                    \
2559           "Print VM flags and their ranges and exit VM")                    \
2560                                                                             \
2561   diagnostic(bool, SerializeVMOutput, true,                                 \
2562           "Use a mutex to serialize output to tty and LogFile")             \
2563                                                                             \
2564   diagnostic(bool, DisplayVMOutput, true,                                   \
2565           "Display all VM output on the tty, independently of LogVMOutput") \
2566                                                                             \
2567   diagnostic(bool, LogVMOutput, false,                                      \
2568           "Save VM output to LogFile")                                      \
2569                                                                             \
2570   diagnostic(ccstr, LogFile, NULL,                                          \
2571           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2572           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2573                                                                             \
2574   product(ccstr, ErrorFile, NULL,                                           \
2575           "If an error occurs, save the error data to this file "           \
2576           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2577                                                                             \
2578   product(bool, DisplayVMOutputToStderr, false,                             \
2579           "If DisplayVMOutput is true, display all VM output to stderr")    \
2580                                                                             \
2581   product(bool, DisplayVMOutputToStdout, false,                             \
2582           "If DisplayVMOutput is true, display all VM output to stdout")    \
2583                                                                             \
2584   product(bool, UseHeavyMonitors, false,                                    \
2585           "use heavyweight instead of lightweight Java monitors")           \
2586                                                                             \
2587   product(bool, PrintStringTableStatistics, false,                          \
2588           "print statistics about the StringTable and SymbolTable")         \
2589                                                                             \
2590   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2591           "verify StringTable contents at exit")                            \
2592                                                                             \
2593   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2594           "print histogram of the symbol table")                            \
2595                                                                             \
2596   notproduct(bool, ExitVMOnVerifyError, false,                              \
2597           "standard exit from VM if bytecode verify error "                 \
2598           "(only in debug mode)")                                           \
2599                                                                             \
2600   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2601           "Call fatal if this exception is thrown.  Example: "              \
2602           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2603                                                                             \
2604   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2605           "Call fatal if the exception pointed by AbortVMOnException "      \
2606           "has this message")                                               \
2607                                                                             \
2608   develop(bool, DebugVtables, false,                                        \
2609           "add debugging code to vtable dispatch")                          \
2610                                                                             \
2611   notproduct(bool, PrintVtableStats, false,                                 \
2612           "print vtables stats at end of run")                              \
2613                                                                             \
2614   develop(bool, TraceCreateZombies, false,                                  \
2615           "trace creation of zombie nmethods")                              \
2616                                                                             \
2617   notproduct(bool, IgnoreLockingAssertions, false,                          \
2618           "disable locking assertions (for speed)")                         \
2619                                                                             \
2620   product(bool, RangeCheckElimination, true,                                \
2621           "Eliminate range checks")                                         \
2622                                                                             \
2623   develop_pd(bool, UncommonNullCast,                                        \
2624           "track occurrences of null in casts; adjust compiler tactics")    \
2625                                                                             \
2626   develop(bool, TypeProfileCasts,  true,                                    \
2627           "treat casts like calls for purposes of type profiling")          \
2628                                                                             \
2629   develop(bool, DelayCompilationDuringStartup, true,                        \
2630           "Delay invoking the compiler until main application class is "    \
2631           "loaded")                                                         \
2632                                                                             \
2633   develop(bool, CompileTheWorld, false,                                     \
2634           "Compile all methods in all classes in bootstrap class path "     \
2635             "(stress test)")                                                \
2636                                                                             \
2637   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2638           "Preload all classes used by a class before start loading")       \
2639                                                                             \
2640   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2641           "Force a safepoint every n compiles so sweeper can keep up")      \
2642                                                                             \
2643   develop(bool, FillDelaySlots, true,                                       \
2644           "Fill delay slots (on SPARC only)")                               \
2645                                                                             \
2646   develop(bool, TimeLivenessAnalysis, false,                                \
2647           "Time computation of bytecode liveness analysis")                 \
2648                                                                             \
2649   develop(bool, TraceLivenessGen, false,                                    \
2650           "Trace the generation of liveness analysis information")          \
2651                                                                             \
2652   notproduct(bool, TraceLivenessQuery, false,                               \
2653           "Trace queries of liveness analysis information")                 \
2654                                                                             \
2655   notproduct(bool, CollectIndexSetStatistics, false,                        \
2656           "Collect information about IndexSets")                            \
2657                                                                             \
2658   develop(bool, UseLoopSafepoints, true,                                    \
2659           "Generate Safepoint nodes in every loop")                         \
2660                                                                             \
2661   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2662           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2663           "Inline allocations larger than this in doublewords must go slow")\
2664                                                                             \
2665   product(bool, AggressiveOpts, false,                                      \
2666           "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
2667                                                                             \
2668   product_pd(bool, CompactStrings,                                          \
2669           "Enable Strings to use single byte chars in backing store")       \
2670                                                                             \
2671   product_pd(uintx, TypeProfileLevel,                                       \
2672           "=XYZ, with Z: Type profiling of arguments at call; "             \
2673                      "Y: Type profiling of return value at call; "          \
2674                      "X: Type profiling of parameters to methods; "         \
2675           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2676           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2677                                                                             \
2678   product(intx, TypeProfileArgsLimit,     2,                                \
2679           "max number of call arguments to consider for type profiling")    \
2680           range(0, 16)                                                      \
2681                                                                             \
2682   product(intx, TypeProfileParmsLimit,    2,                                \
2683           "max number of incoming parameters to consider for type profiling"\
2684           ", -1 for all")                                                   \
2685           range(-1, 64)                                                     \
2686                                                                             \
2687   /* statistics */                                                          \
2688   develop(bool, CountCompiledCalls, false,                                  \
2689           "Count method invocations")                                       \
2690                                                                             \
2691   notproduct(bool, CountRuntimeCalls, false,                                \
2692           "Count VM runtime calls")                                         \
2693                                                                             \
2694   develop(bool, CountJNICalls, false,                                       \
2695           "Count jni method invocations")                                   \
2696                                                                             \
2697   notproduct(bool, CountJVMCalls, false,                                    \
2698           "Count jvm method invocations")                                   \
2699                                                                             \
2700   notproduct(bool, CountRemovableExceptions, false,                         \
2701           "Count exceptions that could be replaced by branches due to "     \
2702           "inlining")                                                       \
2703                                                                             \
2704   notproduct(bool, ICMissHistogram, false,                                  \
2705           "Produce histogram of IC misses")                                 \
2706                                                                             \
2707   /* interpreter */                                                         \
2708   product_pd(bool, RewriteBytecodes,                                        \
2709           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2710                                                                             \
2711   product_pd(bool, RewriteFrequentPairs,                                    \
2712           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2713                                                                             \
2714   diagnostic(bool, PrintInterpreter, false,                                 \
2715           "Print the generated interpreter code")                           \
2716                                                                             \
2717   product(bool, UseInterpreter, true,                                       \
2718           "Use interpreter for non-compiled methods")                       \
2719                                                                             \
2720   develop(bool, UseFastSignatureHandlers, true,                             \
2721           "Use fast signature handlers for native calls")                   \
2722                                                                             \
2723   product(bool, UseLoopCounter, true,                                       \
2724           "Increment invocation counter on backward branch")                \
2725                                                                             \
2726   product_pd(bool, UseOnStackReplacement,                                   \
2727           "Use on stack replacement, calls runtime if invoc. counter "      \
2728           "overflows in loop")                                              \
2729                                                                             \
2730   notproduct(bool, TraceOnStackReplacement, false,                          \
2731           "Trace on stack replacement")                                     \
2732                                                                             \
2733   product_pd(bool, PreferInterpreterNativeStubs,                            \
2734           "Use always interpreter stubs for native methods invoked via "    \
2735           "interpreter")                                                    \
2736                                                                             \
2737   develop(bool, CountBytecodes, false,                                      \
2738           "Count number of bytecodes executed")                             \
2739                                                                             \
2740   develop(bool, PrintBytecodeHistogram, false,                              \
2741           "Print histogram of the executed bytecodes")                      \
2742                                                                             \
2743   develop(bool, PrintBytecodePairHistogram, false,                          \
2744           "Print histogram of the executed bytecode pairs")                 \
2745                                                                             \
2746   diagnostic(bool, PrintSignatureHandlers, false,                           \
2747           "Print code generated for native method signature handlers")      \
2748                                                                             \
2749   develop(bool, VerifyOops, false,                                          \
2750           "Do plausibility checks for oops")                                \
2751                                                                             \
2752   develop(bool, CheckUnhandledOops, false,                                  \
2753           "Check for unhandled oops in VM code")                            \
2754                                                                             \
2755   develop(bool, VerifyJNIFields, trueInDebug,                               \
2756           "Verify jfieldIDs for instance fields")                           \
2757                                                                             \
2758   notproduct(bool, VerifyJNIEnvThread, false,                               \
2759           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2760           "from JNI")                                                       \
2761                                                                             \
2762   develop(bool, VerifyFPU, false,                                           \
2763           "Verify FPU state (check for NaN's, etc.)")                       \
2764                                                                             \
2765   develop(bool, VerifyThread, false,                                        \
2766           "Watch the thread register for corruption (SPARC only)")          \
2767                                                                             \
2768   develop(bool, VerifyActivationFrameSize, false,                           \
2769           "Verify that activation frame didn't become smaller than its "    \
2770           "minimal size")                                                   \
2771                                                                             \
2772   develop(bool, TraceFrequencyInlining, false,                              \
2773           "Trace frequency based inlining")                                 \
2774                                                                             \
2775   develop_pd(bool, InlineIntrinsics,                                        \
2776           "Inline intrinsics that can be statically resolved")              \
2777                                                                             \
2778   product_pd(bool, ProfileInterpreter,                                      \
2779           "Profile at the bytecode level during interpretation")            \
2780                                                                             \
2781   develop(bool, TraceProfileInterpreter, false,                             \
2782           "Trace profiling at the bytecode level during interpretation. "   \
2783           "This outputs the profiling information collected to improve "    \
2784           "jit compilation.")                                               \
2785                                                                             \
2786   develop_pd(bool, ProfileTraps,                                            \
2787           "Profile deoptimization traps at the bytecode level")             \
2788                                                                             \
2789   product(intx, ProfileMaturityPercentage, 20,                              \
2790           "number of method invocations/branches (expressed as % of "       \
2791           "CompileThreshold) before using the method's profile")            \
2792           range(0, 100)                                                     \
2793                                                                             \
2794   diagnostic(bool, PrintMethodData, false,                                  \
2795           "Print the results of +ProfileInterpreter at end of run")         \
2796                                                                             \
2797   develop(bool, VerifyDataPointer, trueInDebug,                             \
2798           "Verify the method data pointer during interpreter profiling")    \
2799                                                                             \
2800   develop(bool, VerifyCompiledCode, false,                                  \
2801           "Include miscellaneous runtime verifications in nmethod code; "   \
2802           "default off because it disturbs nmethod size heuristics")        \
2803                                                                             \
2804   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2805           "Manually make GC thread crash then dump java stack trace;  "     \
2806           "Test only")                                                      \
2807                                                                             \
2808   /* compilation */                                                         \
2809   product(bool, UseCompiler, true,                                          \
2810           "Use Just-In-Time compilation")                                   \
2811                                                                             \
2812   develop(bool, TraceCompilationPolicy, false,                              \
2813           "Trace compilation policy")                                       \
2814                                                                             \
2815   develop(bool, TimeCompilationPolicy, false,                               \
2816           "Time the compilation policy")                                    \
2817                                                                             \
2818   product(bool, UseCounterDecay, true,                                      \
2819           "Adjust recompilation counters")                                  \
2820                                                                             \
2821   develop(intx, CounterHalfLifeTime,    30,                                 \
2822           "Half-life time of invocation counters (in seconds)")             \
2823                                                                             \
2824   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2825           "The minimum interval (in milliseconds) between invocation of "   \
2826           "CounterDecay")                                                   \
2827                                                                             \
2828   product(bool, AlwaysCompileLoopMethods, false,                            \
2829           "When using recompilation, never interpret methods "              \
2830           "containing loops")                                               \
2831                                                                             \
2832   product(bool, DontCompileHugeMethods, true,                               \
2833           "Do not compile methods > HugeMethodLimit")                       \
2834                                                                             \
2835   /* Bytecode escape analysis estimation. */                                \
2836   product(bool, EstimateArgEscape, true,                                    \
2837           "Analyze bytecodes to estimate escape state of arguments")        \
2838                                                                             \
2839   product(intx, BCEATraceLevel, 0,                                          \
2840           "How much tracing to do of bytecode escape analysis estimates "   \
2841           "(0-3)")                                                          \
2842           range(0, 3)                                                       \
2843                                                                             \
2844   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2845           "Maximum number of nested calls that are analyzed by BC EA")      \
2846           range(0, max_jint)                                                \
2847                                                                             \
2848   product(intx, MaxBCEAEstimateSize, 150,                                   \
2849           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2850           range(0, max_jint)                                                \
2851                                                                             \
2852   product(intx,  AllocatePrefetchStyle, 1,                                  \
2853           "0 = no prefetch, "                                               \
2854           "1 = generate prefetch instructions for each allocation, "        \
2855           "2 = use TLAB watermark to gate allocation prefetch, "            \
2856           "3 = generate one prefetch instruction per cache line")           \
2857           range(0, 3)                                                       \
2858                                                                             \
2859   product(intx,  AllocatePrefetchDistance, -1,                              \
2860           "Distance to prefetch ahead of allocation pointer. "              \
2861           "-1: use system-specific value (automatically determined")        \
2862           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2863                                                                             \
2864   product(intx,  AllocatePrefetchLines, 3,                                  \
2865           "Number of lines to prefetch ahead of array allocation pointer")  \
2866           range(1, 64)                                                      \
2867                                                                             \
2868   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2869           "Number of lines to prefetch ahead of instance allocation "       \
2870           "pointer")                                                        \
2871           range(1, 64)                                                      \
2872                                                                             \
2873   product(intx,  AllocatePrefetchStepSize, 16,                              \
2874           "Step size in bytes of sequential prefetch instructions")         \
2875           range(1, 512)                                                     \
2876           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2877                                                                             \
2878   product(intx,  AllocatePrefetchInstr, 0,                                  \
2879           "Select instruction to prefetch ahead of allocation pointer")     \
2880           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2881                                                                             \
2882   /* deoptimization */                                                      \
2883   develop(bool, TraceDeoptimization, false,                                 \
2884           "Trace deoptimization")                                           \
2885                                                                             \
2886   develop(bool, PrintDeoptimizationDetails, false,                          \
2887           "Print more information about deoptimization")                    \
2888                                                                             \
2889   develop(bool, DebugDeoptimization, false,                                 \
2890           "Tracing various information while debugging deoptimization")     \
2891                                                                             \
2892   product(intx, SelfDestructTimer, 0,                                       \
2893           "Will cause VM to terminate after a given time (in minutes) "     \
2894           "(0 means off)")                                                  \
2895           range(0, max_intx)                                                \
2896                                                                             \
2897   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2898           "The maximum number of lines in the stack trace for Java "        \
2899           "exceptions (0 means all)")                                       \
2900           range(0, max_jint/2)                                              \
2901                                                                             \
2902   /* notice: the max range value here is max_jint, not max_intx  */         \
2903   /* because of overflow issue                                   */         \
2904   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2905           "Guarantee a safepoint (at least) every so many milliseconds "    \
2906           "(0 means none)")                                                 \
2907           range(0, max_jint)                                                \
2908                                                                             \
2909   product(intx, SafepointTimeoutDelay, 10000,                               \
2910           "Delay in milliseconds for option SafepointTimeout")              \
2911   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2912   NOT_LP64(range(0, max_intx))                                              \
2913                                                                             \
2914   product(intx, NmethodSweepActivity, 10,                                   \
2915           "Removes cold nmethods from code cache if > 0. Higher values "    \
2916           "result in more aggressive sweeping")                             \
2917           range(0, 2000)                                                    \
2918                                                                             \
2919   notproduct(bool, LogSweeper, false,                                       \
2920           "Keep a ring buffer of sweeper activity")                         \
2921                                                                             \
2922   notproduct(intx, SweeperLogEntries, 1024,                                 \
2923           "Number of records in the ring buffer of sweeper activity")       \
2924                                                                             \
2925   notproduct(intx, MemProfilingInterval, 500,                               \
2926           "Time between each invocation of the MemProfiler")                \
2927                                                                             \
2928   develop(intx, MallocCatchPtr, -1,                                         \
2929           "Hit breakpoint when mallocing/freeing this pointer")             \
2930                                                                             \
2931   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2932           "List of assertions (file:line) to muzzle")                       \
2933                                                                             \
2934   develop(intx, StackPrintLimit, 100,                                       \
2935           "number of stack frames to print in VM-level stack dump")         \
2936                                                                             \
2937   notproduct(intx, MaxElementPrintSize, 256,                                \
2938           "maximum number of elements to print")                            \
2939                                                                             \
2940   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2941           "maximum number of subklasses to print when printing klass")      \
2942                                                                             \
2943   product(intx, MaxInlineLevel, 9,                                          \
2944           "maximum number of nested calls that are inlined")                \
2945           range(0, max_jint)                                                \
2946                                                                             \
2947   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2948           "maximum number of nested recursive calls that are inlined")      \
2949           range(0, max_jint)                                                \
2950                                                                             \
2951   develop(intx, MaxForceInlineLevel, 100,                                   \
2952           "maximum number of nested calls that are forced for inlining "    \
2953           "(using CompileCommand or marked w/ @ForceInline)")               \
2954           range(0, max_jint)                                                \
2955                                                                             \
2956   product_pd(intx, InlineSmallCode,                                         \
2957           "Only inline already compiled methods if their code size is "     \
2958           "less than this")                                                 \
2959           range(0, max_jint)                                                \
2960                                                                             \
2961   product(intx, MaxInlineSize, 35,                                          \
2962           "The maximum bytecode size of a method to be inlined")            \
2963           range(0, max_jint)                                                \
2964                                                                             \
2965   product_pd(intx, FreqInlineSize,                                          \
2966           "The maximum bytecode size of a frequent method to be inlined")   \
2967           range(0, max_jint)                                                \
2968                                                                             \
2969   product(intx, MaxTrivialSize, 6,                                          \
2970           "The maximum bytecode size of a trivial method to be inlined")    \
2971           range(0, max_jint)                                                \
2972                                                                             \
2973   product(intx, MinInliningThreshold, 250,                                  \
2974           "The minimum invocation count a method needs to have to be "      \
2975           "inlined")                                                        \
2976           range(0, max_jint)                                                \
2977                                                                             \
2978   develop(intx, MethodHistogramCutoff, 100,                                 \
2979           "The cutoff value for method invocation histogram (+CountCalls)") \
2980                                                                             \
2981   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2982           "Number of interpreted methods to show in profile")               \
2983                                                                             \
2984   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2985           "Number of compiled methods to show in profile")                  \
2986                                                                             \
2987   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2988           "Number of stub methods to show in profile")                      \
2989                                                                             \
2990   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2991           "Number of runtime stub nodes to show in profile")                \
2992                                                                             \
2993   product(intx, ProfileIntervalsTicks, 100,                                 \
2994           "Number of ticks between printing of interval profile "           \
2995           "(+ProfileIntervals)")                                            \
2996           range(0, max_intx)                                                \
2997                                                                             \
2998   notproduct(intx, ScavengeALotInterval,     1,                             \
2999           "Interval between which scavenge will occur with +ScavengeALot")  \
3000                                                                             \
3001   notproduct(intx, FullGCALotInterval,     1,                               \
3002           "Interval between which full gc will occur with +FullGCALot")     \
3003                                                                             \
3004   notproduct(intx, FullGCALotStart,     0,                                  \
3005           "For which invocation to start FullGCAlot")                       \
3006                                                                             \
3007   notproduct(intx, FullGCALotDummies,  32*K,                                \
3008           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3009           "to move")                                                        \
3010                                                                             \
3011   develop(intx, DontYieldALotInterval,    10,                               \
3012           "Interval between which yields will be dropped (milliseconds)")   \
3013                                                                             \
3014   develop(intx, ProfilerPCTickThreshold,    15,                             \
3015           "Number of ticks in a PC buckets to be a hotspot")                \
3016                                                                             \
3017   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3018           "Number of exits until DeoptimizeALot kicks in")                  \
3019                                                                             \
3020   notproduct(intx, ZombieALotInterval,     5,                               \
3021           "Number of exits until ZombieALot kicks in")                      \
3022                                                                             \
3023   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3024           "If non-zero, maximum number of words that malloc/realloc can "   \
3025           "allocate (for testing only)")                                    \
3026           range(0, max_uintx)                                               \
3027                                                                             \
3028   product(intx, TypeProfileWidth, 2,                                        \
3029           "Number of receiver types to record in call/cast profile")        \
3030           range(0, 8)                                                       \
3031                                                                             \
3032   develop(intx, BciProfileWidth,      2,                                    \
3033           "Number of return bci's to record in ret profile")                \
3034                                                                             \
3035   product(intx, PerMethodRecompilationCutoff, 400,                          \
3036           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3037           range(-1, max_intx)                                               \
3038                                                                             \
3039   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3040           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3041           range(-1, max_intx)                                               \
3042                                                                             \
3043   product(intx, PerMethodTrapLimit,  100,                                   \
3044           "Limit on traps (of one kind) in a method (includes inlines)")    \
3045           range(0, max_jint)                                                \
3046                                                                             \
3047   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3048           "Limit on speculative traps (of one kind) in a method "           \
3049           "(includes inlines)")                                             \
3050           range(0, max_jint)                                                \
3051                                                                             \
3052   product(intx, PerBytecodeTrapLimit,  4,                                   \
3053           "Limit on traps (of one kind) at a particular BCI")               \
3054           range(0, max_jint)                                                \
3055                                                                             \
3056   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3057           "Extra method data trap entries for speculation")                 \
3058                                                                             \
3059   develop(intx, InlineFrequencyRatio,    20,                                \
3060           "Ratio of call site execution to caller method invocation")       \
3061           range(0, max_jint)                                                \
3062                                                                             \
3063   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3064           "Count of call site execution necessary to trigger frequent "     \
3065           "inlining")                                                       \
3066           range(0, max_jint)                                                \
3067                                                                             \
3068   develop(intx, InlineThrowCount,    50,                                    \
3069           "Force inlining of interpreted methods that throw this often")    \
3070           range(0, max_jint)                                                \
3071                                                                             \
3072   develop(intx, InlineThrowMaxSize,   200,                                  \
3073           "Force inlining of throwing methods smaller than this")           \
3074           range(0, max_jint)                                                \
3075                                                                             \
3076   develop(intx, ProfilerNodeSize,  1024,                                    \
3077           "Size in K to allocate for the Profile Nodes of each thread")     \
3078           range(0, 1024)                                                    \
3079                                                                             \
3080   /* gc parameters */                                                       \
3081   product(size_t, InitialHeapSize, 0,                                       \
3082           "Initial heap size (in bytes); zero means use ergonomics")        \
3083           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3084                                                                             \
3085   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3086           "Maximum heap size (in bytes)")                                   \
3087           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3088                                                                             \
3089   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3090           "Initial tenured generation size (in bytes)")                     \
3091           range(0, max_uintx)                                               \
3092                                                                             \
3093   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3094           "Initial new generation size (in bytes)")                         \
3095           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3096                                                                             \
3097   product(size_t, MaxNewSize, max_uintx,                                    \
3098           "Maximum new generation size (in bytes), max_uintx means set "    \
3099           "ergonomically")                                                  \
3100           range(0, max_uintx)                                               \
3101                                                                             \
3102   product_pd(size_t, HeapBaseMinAddress,                                    \
3103           "OS specific low limit for heap base address")                    \
3104           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3105                                                                             \
3106   product(size_t, PretenureSizeThreshold, 0,                                \
3107           "Maximum size in bytes of objects allocated in DefNew "           \
3108           "generation; zero means no maximum")                              \
3109           range(0, max_uintx)                                               \
3110                                                                             \
3111   product(size_t, MinTLABSize, 2*K,                                         \
3112           "Minimum allowed TLAB size (in bytes)")                           \
3113           range(1, max_uintx/2)                                             \
3114           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3115                                                                             \
3116   product(size_t, TLABSize, 0,                                              \
3117           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3118           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3119                                                                             \
3120   product(size_t, YoungPLABSize, 4096,                                      \
3121           "Size of young gen promotion LAB's (in HeapWords)")               \
3122           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3123                                                                             \
3124   product(size_t, OldPLABSize, 1024,                                        \
3125           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3126           "of blocks to attempt to claim when refilling CMS LAB's")         \
3127           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3128                                                                             \
3129   product(uintx, TLABAllocationWeight, 35,                                  \
3130           "Allocation averaging weight")                                    \
3131           range(0, 100)                                                     \
3132                                                                             \
3133   /* Limit the lower bound of this flag to 1 as it is used  */              \
3134   /* in a division expression.                              */              \
3135   product(uintx, TLABWasteTargetPercent, 1,                                 \
3136           "Percentage of Eden that can be wasted")                          \
3137           range(1, 100)                                                     \
3138                                                                             \
3139   product(uintx, TLABRefillWasteFraction,    64,                            \
3140           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3141           range(1, max_juint)                                               \
3142                                                                             \
3143   product(uintx, TLABWasteIncrement,    4,                                  \
3144           "Increment allowed waste at slow allocation")                     \
3145           range(0, max_jint)                                                \
3146           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3147                                                                             \
3148   product(uintx, SurvivorRatio, 8,                                          \
3149           "Ratio of eden/survivor space size")                              \
3150           range(1, max_uintx-2)                                             \
3151           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3152                                                                             \
3153   product(uintx, NewRatio, 2,                                               \
3154           "Ratio of old/new generation sizes")                              \
3155           range(0, max_uintx-1)                                             \
3156                                                                             \
3157   product_pd(size_t, NewSizeThreadIncrease,                                 \
3158           "Additional size added to desired new generation size per "       \
3159           "non-daemon thread (in bytes)")                                   \
3160           range(0, max_uintx)                                               \
3161                                                                             \
3162   product_pd(size_t, MetaspaceSize,                                         \
3163           "Initial threshold (in bytes) at which a garbage collection "     \
3164           "is done to reduce Metaspace usage")                              \
3165           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3166                                                                             \
3167   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3168           "Maximum size of Metaspaces (in bytes)")                          \
3169           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3170                                                                             \
3171   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3172           "Maximum size of class area in Metaspace when compressed "        \
3173           "class pointers are used")                                        \
3174           range(1*M, 3*G)                                                   \
3175                                                                             \
3176   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3177           "The minimum percentage of heap free after GC to avoid expansion."\
3178           " For most GCs this applies to the old generation. In G1 and"     \
3179           " ParallelGC it applies to the whole heap.")                      \
3180           range(0, 100)                                                     \
3181           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3182                                                                             \
3183   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3184           "The maximum percentage of heap free after GC to avoid shrinking."\
3185           " For most GCs this applies to the old generation. In G1 and"     \
3186           " ParallelGC it applies to the whole heap.")                      \
3187           range(0, 100)                                                     \
3188           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3189                                                                             \
3190   product(bool, ShrinkHeapInSteps, true,                                    \
3191           "When disabled, informs the GC to shrink the java heap directly"  \
3192           " to the target size at the next full GC rather than requiring"   \
3193           " smaller steps during multiple full GCs.")                       \
3194                                                                             \
3195   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3196           "Number of milliseconds per MB of free space in the heap")        \
3197           range(0, max_intx)                                                \
3198           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3199                                                                             \
3200   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3201           "The minimum change in heap space due to GC (in bytes)")          \
3202           range(0, max_uintx)                                               \
3203                                                                             \
3204   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3205           "The minimum expansion of Metaspace (in bytes)")                  \
3206           range(0, max_uintx)                                               \
3207                                                                             \
3208   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3209           "The maximum percentage of Metaspace free after GC to avoid "     \
3210           "shrinking")                                                      \
3211           range(0, 100)                                                     \
3212           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3213                                                                             \
3214   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3215           "The minimum percentage of Metaspace free after GC to avoid "     \
3216           "expansion")                                                      \
3217           range(0, 99)                                                      \
3218           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3219                                                                             \
3220   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3221           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3222           range(0, max_uintx)                                               \
3223                                                                             \
3224   product(uintx, QueuedAllocationWarningCount, 0,                           \
3225           "Number of times an allocation that queues behind a GC "          \
3226           "will retry before printing a warning")                           \
3227           range(0, max_uintx)                                               \
3228                                                                             \
3229   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3230           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3231           range(0, max_uintx)                                               \
3232                                                                             \
3233   diagnostic(intx, VerifyGCLevel,     0,                                    \
3234           "Generation level at which to start +VerifyBefore/AfterGC")       \
3235           range(0, 1)                                                       \
3236                                                                             \
3237   product(uintx, MaxTenuringThreshold,    15,                               \
3238           "Maximum value for tenuring threshold")                           \
3239           range(0, markOopDesc::max_age + 1)                                \
3240           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3241                                                                             \
3242   product(uintx, InitialTenuringThreshold,    7,                            \
3243           "Initial value for tenuring threshold")                           \
3244           range(0, markOopDesc::max_age + 1)                                \
3245           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3246                                                                             \
3247   product(uintx, TargetSurvivorRatio,    50,                                \
3248           "Desired percentage of survivor space used after scavenge")       \
3249           range(0, 100)                                                     \
3250                                                                             \
3251   product(uintx, MarkSweepDeadRatio,     5,                                 \
3252           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3253           "Serial mark sweep treats this as both the minimum and maximum "  \
3254           "value. "                                                         \
3255           "CMS uses this value only if it falls back to mark sweep. "       \
3256           "Par compact uses a variable scale based on the density of the "  \
3257           "generation and treats this as the maximum value when the heap "  \
3258           "is either completely full or completely empty.  Par compact "    \
3259           "also has a smaller default value; see arguments.cpp.")           \
3260           range(0, 100)                                                     \
3261                                                                             \
3262   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3263           "How often should we fully compact the heap (ignoring the dead "  \
3264           "space parameters)")                                              \
3265           range(1, max_juint)                                               \
3266                                                                             \
3267   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3268           "Delay between expansion and allocation (in milliseconds)")       \
3269                                                                             \
3270   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3271           "Delay in scheduling GC workers (in milliseconds)")               \
3272                                                                             \
3273   product(bool, PSChunkLargeArrays, true,                                   \
3274           "Process large arrays in chunks")                                 \
3275                                                                             \
3276   product(uintx, GCDrainStackTargetSize, 64,                                \
3277           "Number of entries we will try to leave on the stack "            \
3278           "during parallel gc")                                             \
3279           range(0, max_juint)                                               \
3280                                                                             \
3281   /* stack parameters */                                                    \
3282   product_pd(intx, StackYellowPages,                                        \
3283           "Number of yellow zone (recoverable overflows) pages of size "    \
3284           "4KB. If pages are bigger yellow zone is aligned up.")            \
3285           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3286                                                                             \
3287   product_pd(intx, StackRedPages,                                           \
3288           "Number of red zone (unrecoverable overflows) pages of size "     \
3289           "4KB. If pages are bigger red zone is aligned up.")               \
3290           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3291                                                                             \
3292   product_pd(intx, StackReservedPages,                                      \
3293           "Number of reserved zone (reserved to annotated methods) pages"   \
3294           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3295           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3296                                                                             \
3297   product(bool, RestrictReservedStack, true,                                \
3298           "Restrict @ReservedStackAccess to trusted classes")               \
3299                                                                             \
3300   /* greater stack shadow pages can't generate instruction to bang stack */ \
3301   product_pd(intx, StackShadowPages,                                        \
3302           "Number of shadow zone (for overflow checking) pages of size "    \
3303           "4KB. If pages are bigger shadow zone is aligned up. "            \
3304           "This should exceed the depth of the VM and native call stack.")  \
3305           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3306                                                                             \
3307   product_pd(intx, ThreadStackSize,                                         \
3308           "Thread Stack Size (in Kbytes)")                                  \
3309           range(0, 1 * M)                                                   \
3310                                                                             \
3311   product_pd(intx, VMThreadStackSize,                                       \
3312           "Non-Java Thread Stack Size (in Kbytes)")                         \
3313           range(0, max_intx/(1 * K))                                        \
3314                                                                             \
3315   product_pd(intx, CompilerThreadStackSize,                                 \
3316           "Compiler Thread Stack Size (in Kbytes)")                         \
3317           range(0, max_intx/(1 * K))                                        \
3318                                                                             \
3319   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3320           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3321                                                                             \
3322   /* code cache parameters                                    */            \
3323   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3324           "Code cache segment size (in bytes) - smallest unit of "          \
3325           "allocation")                                                     \
3326           range(1, 1024)                                                    \
3327           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3328                                                                             \
3329   develop_pd(intx, CodeEntryAlignment,                                      \
3330           "Code entry alignment for generated code (in bytes)")             \
3331           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3332                                                                             \
3333   product_pd(intx, OptoLoopAlignment,                                       \
3334           "Align inner loops to zero relative to this modulus")             \
3335           range(1, 16)                                                      \
3336           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3337                                                                             \
3338   product_pd(uintx, InitialCodeCacheSize,                                   \
3339           "Initial code cache size (in bytes)")                             \
3340           range(os::vm_page_size(), max_uintx)                              \
3341                                                                             \
3342   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3343           "Minimum code cache size (in bytes) required to start VM.")       \
3344           range(0, max_uintx)                                               \
3345                                                                             \
3346   product(bool, SegmentedCodeCache, false,                                  \
3347           "Use a segmented code cache")                                     \
3348                                                                             \
3349   product_pd(uintx, ReservedCodeCacheSize,                                  \
3350           "Reserved code cache size (in bytes) - maximum code cache size")  \
3351           range(os::vm_page_size(), max_uintx)                              \
3352                                                                             \
3353   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3354           "Size of code heap with non-profiled methods (in bytes)")         \
3355           range(0, max_uintx)                                               \
3356                                                                             \
3357   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3358           "Size of code heap with profiled methods (in bytes)")             \
3359           range(0, max_uintx)                                               \
3360                                                                             \
3361   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3362           "Size of code heap with non-nmethods (in bytes)")                 \
3363           range(os::vm_page_size(), max_uintx)                              \
3364                                                                             \
3365   product_pd(uintx, CodeCacheExpansionSize,                                 \
3366           "Code cache expansion size (in bytes)")                           \
3367           range(32*K, max_uintx)                                            \
3368                                                                             \
3369   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3370           "Minimum number of segments in a code cache block")               \
3371           range(1, 100)                                                     \
3372                                                                             \
3373   notproduct(bool, ExitOnFullCodeCache, false,                              \
3374           "Exit the VM if we fill the code cache")                          \
3375                                                                             \
3376   product(bool, UseCodeCacheFlushing, true,                                 \
3377           "Remove cold/old nmethods from the code cache")                   \
3378                                                                             \
3379   product(uintx, StartAggressiveSweepingAt, 10,                             \
3380           "Start aggressive sweeping if X[%] of the code cache is free."    \
3381           "Segmented code cache: X[%] of the non-profiled heap."            \
3382           "Non-segmented code cache: X[%] of the total code cache")         \
3383           range(0, 100)                                                     \
3384                                                                             \
3385   /* AOT parameters */                                                      \
3386   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3387           "Use AOT compiled files")                                         \
3388                                                                             \
3389   product(ccstrlist, AOTLibrary, NULL,                                      \
3390           "AOT library")                                                    \
3391                                                                             \
3392   product(bool, PrintAOT, false,                                            \
3393           "Print used AOT klasses and methods")                             \
3394                                                                             \
3395   notproduct(bool, PrintAOTStatistics, false,                               \
3396           "Print AOT statistics")                                           \
3397                                                                             \
3398   diagnostic(bool, UseAOTStrictLoading, false,                              \
3399           "Exit the VM if any of the AOT libraries has invalid config")     \
3400                                                                             \
3401   product(bool, CalculateClassFingerprint, false,                           \
3402           "Calculate class fingerprint")                                    \
3403                                                                             \
3404   /* interpreter debugging */                                               \
3405   develop(intx, BinarySwitchThreshold, 5,                                   \
3406           "Minimal number of lookupswitch entries for rewriting to binary " \
3407           "switch")                                                         \
3408                                                                             \
3409   develop(intx, StopInterpreterAt, 0,                                       \
3410           "Stop interpreter execution at specified bytecode number")        \
3411                                                                             \
3412   develop(intx, TraceBytecodesAt, 0,                                        \
3413           "Trace bytecodes starting with specified bytecode number")        \
3414                                                                             \
3415   /* compiler interface */                                                  \
3416   develop(intx, CIStart, 0,                                                 \
3417           "The id of the first compilation to permit")                      \
3418                                                                             \
3419   develop(intx, CIStop, max_jint,                                           \
3420           "The id of the last compilation to permit")                       \
3421                                                                             \
3422   develop(intx, CIStartOSR, 0,                                              \
3423           "The id of the first osr compilation to permit "                  \
3424           "(CICountOSR must be on)")                                        \
3425                                                                             \
3426   develop(intx, CIStopOSR, max_jint,                                        \
3427           "The id of the last osr compilation to permit "                   \
3428           "(CICountOSR must be on)")                                        \
3429                                                                             \
3430   develop(intx, CIBreakAtOSR, -1,                                           \
3431           "The id of osr compilation to break at")                          \
3432                                                                             \
3433   develop(intx, CIBreakAt, -1,                                              \
3434           "The id of compilation to break at")                              \
3435                                                                             \
3436   product(ccstrlist, CompileOnly, "",                                       \
3437           "List of methods (pkg/class.name) to restrict compilation to")    \
3438                                                                             \
3439   product(ccstr, CompileCommandFile, NULL,                                  \
3440           "Read compiler commands from this file [.hotspot_compiler]")      \
3441                                                                             \
3442   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3443           "Read compiler directives from this file")                        \
3444                                                                             \
3445   product(ccstrlist, CompileCommand, "",                                    \
3446           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3447                                                                             \
3448   develop(bool, ReplayCompiles, false,                                      \
3449           "Enable replay of compilations from ReplayDataFile")              \
3450                                                                             \
3451   product(ccstr, ReplayDataFile, NULL,                                      \
3452           "File containing compilation replay information"                  \
3453           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3454                                                                             \
3455    product(ccstr, InlineDataFile, NULL,                                     \
3456           "File containing inlining replay information"                     \
3457           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3458                                                                             \
3459   develop(intx, ReplaySuppressInitializers, 2,                              \
3460           "Control handling of class initialization during replay: "        \
3461           "0 - don't do anything special; "                                 \
3462           "1 - treat all class initializers as empty; "                     \
3463           "2 - treat class initializers for application classes as empty; " \
3464           "3 - allow all class initializers to run during bootstrap but "   \
3465           "    pretend they are empty after starting replay")               \
3466           range(0, 3)                                                       \
3467                                                                             \
3468   develop(bool, ReplayIgnoreInitErrors, false,                              \
3469           "Ignore exceptions thrown during initialization for replay")      \
3470                                                                             \
3471   product(bool, DumpReplayDataOnError, true,                                \
3472           "Record replay data for crashing compiler threads")               \
3473                                                                             \
3474   product(bool, CICompilerCountPerCPU, false,                               \
3475           "1 compiler thread for log(N CPUs)")                              \
3476                                                                             \
3477   develop(intx, CIFireOOMAt,    -1,                                         \
3478           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3479           "(non-negative value throws OOM after this many CI accesses "     \
3480           "in each compile)")                                               \
3481   notproduct(intx, CICrashAt, -1,                                           \
3482           "id of compilation to trigger assert in compiler thread for "     \
3483           "the purpose of testing, e.g. generation of replay data")         \
3484   notproduct(bool, CIObjectFactoryVerify, false,                            \
3485           "enable potentially expensive verification in ciObjectFactory")   \
3486                                                                             \
3487   /* Priorities */                                                          \
3488   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3489                                                                             \
3490   product(intx, ThreadPriorityPolicy, 0,                                    \
3491           "0 : Normal.                                                     "\
3492           "    VM chooses priorities that are appropriate for normal       "\
3493           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3494           "    to normal native priority. Java priorities below "           \
3495           "    NORM_PRIORITY map to lower native priority values. On       "\
3496           "    Windows applications are allowed to use higher native       "\
3497           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3498           "    not use the highest possible native priority,               "\
3499           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3500           "    system threads. On Linux thread priorities are ignored      "\
3501           "    because the OS does not support static priority in          "\
3502           "    SCHED_OTHER scheduling class which is the only choice for   "\
3503           "    non-root, non-realtime applications.                        "\
3504           "1 : Aggressive.                                                 "\
3505           "    Java thread priorities map over to the entire range of      "\
3506           "    native thread priorities. Higher Java thread priorities map "\
3507           "    to higher native thread priorities. This policy should be   "\
3508           "    used with care, as sometimes it can cause performance       "\
3509           "    degradation in the application and/or the entire system. On "\
3510           "    Linux this policy requires root privilege.")                 \
3511           range(0, 1)                                                       \
3512                                                                             \
3513   product(bool, ThreadPriorityVerbose, false,                               \
3514           "Print priority changes")                                         \
3515                                                                             \
3516   product(intx, CompilerThreadPriority, -1,                                 \
3517           "The native priority at which compiler threads should run "       \
3518           "(-1 means no change)")                                           \
3519           range(min_jint, max_jint)                                         \
3520           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3521                                                                             \
3522   product(intx, VMThreadPriority, -1,                                       \
3523           "The native priority at which the VM thread should run "          \
3524           "(-1 means no change)")                                           \
3525           range(-1, 127)                                                    \
3526                                                                             \
3527   product(bool, CompilerThreadHintNoPreempt, false,                         \
3528           "(Solaris only) Give compiler threads an extra quanta")           \
3529                                                                             \
3530   product(bool, VMThreadHintNoPreempt, false,                               \
3531           "(Solaris only) Give VM thread an extra quanta")                  \
3532                                                                             \
3533   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3534           "Map Java priorities to OS priorities")                           \
3535           range(-1, 127)                                                    \
3536                                                                             \
3537   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3538           "Map Java priorities to OS priorities")                           \
3539           range(-1, 127)                                                    \
3540                                                                             \
3541   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3542           "Map Java priorities to OS priorities")                           \
3543           range(-1, 127)                                                    \
3544                                                                             \
3545   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3546           "Map Java priorities to OS priorities")                           \
3547           range(-1, 127)                                                    \
3548                                                                             \
3549   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3550           "Map Java priorities to OS priorities")                           \
3551           range(-1, 127)                                                    \
3552                                                                             \
3553   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3554           "Map Java priorities to OS priorities")                           \
3555           range(-1, 127)                                                    \
3556                                                                             \
3557   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3558           "Map Java priorities to OS priorities")                           \
3559           range(-1, 127)                                                    \
3560                                                                             \
3561   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3562           "Map Java priorities to OS priorities")                           \
3563           range(-1, 127)                                                    \
3564                                                                             \
3565   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3566           "Map Java priorities to OS priorities")                           \
3567           range(-1, 127)                                                    \
3568                                                                             \
3569   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3570           "Map Java priorities to OS priorities")                           \
3571           range(-1, 127)                                                    \
3572                                                                             \
3573   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3574           "Java thread priority 10 maps to critical scheduling priority")   \
3575                                                                             \
3576   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3577           "Compiler thread(s) run at critical scheduling priority")         \
3578                                                                             \
3579   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3580           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3581                                                                             \
3582   /* compiler debugging */                                                  \
3583   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3584           "First class to consider when using +CompileTheWorld")            \
3585                                                                             \
3586   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3587           "Last class to consider when using +CompileTheWorld")             \
3588                                                                             \
3589   develop(intx, NewCodeParameter,      0,                                   \
3590           "Testing Only: Create a dedicated integer parameter before "      \
3591           "putback")                                                        \
3592                                                                             \
3593   /* new oopmap storage allocation */                                       \
3594   develop(intx, MinOopMapAllocation,     8,                                 \
3595           "Minimum number of OopMap entries in an OopMapSet")               \
3596                                                                             \
3597   /* Background Compilation */                                              \
3598   develop(intx, LongCompileThreshold,     50,                               \
3599           "Used with +TraceLongCompiles")                                   \
3600                                                                             \
3601   /* recompilation */                                                       \
3602   product_pd(intx, CompileThreshold,                                        \
3603           "number of interpreted method invocations before (re-)compiling") \
3604           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3605                                                                             \
3606   product(double, CompileThresholdScaling, 1.0,                             \
3607           "Factor to control when first compilation happens "               \
3608           "(both with and without tiered compilation): "                    \
3609           "values greater than 1.0 delay counter overflow, "                \
3610           "values between 0 and 1.0 rush counter overflow, "                \
3611           "value of 1.0 leaves compilation thresholds unchanged "           \
3612           "value of 0.0 is equivalent to -Xint. "                           \
3613           ""                                                                \
3614           "Flag can be set as per-method option. "                          \
3615           "If a value is specified for a method, compilation thresholds "   \
3616           "for that method are scaled by both the value of the global flag "\
3617           "and the value of the per-method flag.")                          \
3618           range(0.0, DBL_MAX)                                               \
3619                                                                             \
3620   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3621           "Interpreter (tier 0) invocation notification frequency")         \
3622           range(0, 30)                                                      \
3623                                                                             \
3624   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3625           "C1 without MDO (tier 2) invocation notification frequency")      \
3626           range(0, 30)                                                      \
3627                                                                             \
3628   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3629           "C1 with MDO profiling (tier 3) invocation notification "         \
3630           "frequency")                                                      \
3631           range(0, 30)                                                      \
3632                                                                             \
3633   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3634           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3635           range(0, 30)                                                      \
3636                                                                             \
3637   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3638           "Interpreter (tier 0) invocation notification frequency")         \
3639           range(0, 30)                                                      \
3640                                                                             \
3641   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3642           "C1 without MDO (tier 2) invocation notification frequency")      \
3643           range(0, 30)                                                      \
3644                                                                             \
3645   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3646           "C1 with MDO profiling (tier 3) invocation notification "         \
3647           "frequency")                                                      \
3648           range(0, 30)                                                      \
3649                                                                             \
3650   product(intx, Tier2CompileThreshold, 0,                                   \
3651           "threshold at which tier 2 compilation is invoked")               \
3652           range(0, max_jint)                                                \
3653                                                                             \
3654   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3655           "Back edge threshold at which tier 2 compilation is invoked")     \
3656           range(0, max_jint)                                                \
3657                                                                             \
3658   product(intx, Tier3InvocationThreshold, 200,                              \
3659           "Compile if number of method invocations crosses this "           \
3660           "threshold")                                                      \
3661           range(0, max_jint)                                                \
3662                                                                             \
3663   product(intx, Tier3MinInvocationThreshold, 100,                           \
3664           "Minimum invocation to compile at tier 3")                        \
3665           range(0, max_jint)                                                \
3666                                                                             \
3667   product(intx, Tier3CompileThreshold, 2000,                                \
3668           "Threshold at which tier 3 compilation is invoked (invocation "   \
3669           "minimum must be satisfied)")                                     \
3670           range(0, max_jint)                                                \
3671                                                                             \
3672   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3673           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3674           range(0, max_jint)                                                \
3675                                                                             \
3676   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3677           "Compile if number of method invocations crosses this "           \
3678           "threshold if coming from AOT")                                   \
3679           range(0, max_jint)                                                \
3680                                                                             \
3681   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3682           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3683           range(0, max_jint)                                                \
3684                                                                             \
3685   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3686           "Threshold at which tier 3 compilation is invoked (invocation "   \
3687           "minimum must be satisfied) if coming from AOT")                  \
3688           range(0, max_jint)                                                \
3689                                                                             \
3690   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3691           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3692           "if coming from AOT")                                             \
3693           range(0, max_jint)                                                \
3694                                                                             \
3695   product(intx, Tier4InvocationThreshold, 5000,                             \
3696           "Compile if number of method invocations crosses this "           \
3697           "threshold")                                                      \
3698           range(0, max_jint)                                                \
3699                                                                             \
3700   product(intx, Tier4MinInvocationThreshold, 600,                           \
3701           "Minimum invocation to compile at tier 4")                        \
3702           range(0, max_jint)                                                \
3703                                                                             \
3704   product(intx, Tier4CompileThreshold, 15000,                               \
3705           "Threshold at which tier 4 compilation is invoked (invocation "   \
3706           "minimum must be satisfied")                                      \
3707           range(0, max_jint)                                                \
3708                                                                             \
3709   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3710           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3711           range(0, max_jint)                                                \
3712                                                                             \
3713   product(intx, Tier3DelayOn, 5,                                            \
3714           "If C2 queue size grows over this amount per compiler thread "    \
3715           "stop compiling at tier 3 and start compiling at tier 2")         \
3716           range(0, max_jint)                                                \
3717                                                                             \
3718   product(intx, Tier3DelayOff, 2,                                           \
3719           "If C2 queue size is less than this amount per compiler thread "  \
3720           "allow methods compiled at tier 2 transition to tier 3")          \
3721           range(0, max_jint)                                                \
3722                                                                             \
3723   product(intx, Tier3LoadFeedback, 5,                                       \
3724           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3725           "reaches this amount per compiler thread")                        \
3726           range(0, max_jint)                                                \
3727                                                                             \
3728   product(intx, Tier4LoadFeedback, 3,                                       \
3729           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3730           "reaches this amount per compiler thread")                        \
3731           range(0, max_jint)                                                \
3732                                                                             \
3733   product(intx, TieredCompileTaskTimeout, 50,                               \
3734           "Kill compile task if method was not used within "                \
3735           "given timeout in milliseconds")                                  \
3736           range(0, max_intx)                                                \
3737                                                                             \
3738   product(intx, TieredStopAtLevel, 4,                                       \
3739           "Stop at given compilation level")                                \
3740           range(0, 4)                                                       \
3741                                                                             \
3742   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3743           "Start profiling in interpreter if the counters exceed tier 3 "   \
3744           "thresholds by the specified percentage")                         \
3745           range(0, max_jint)                                                \
3746                                                                             \
3747   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3748           "Increase the compile threshold for C1 compilation if the code "  \
3749           "cache is filled by the specified percentage")                    \
3750           range(0, 99)                                                      \
3751                                                                             \
3752   product(intx, TieredRateUpdateMinTime, 1,                                 \
3753           "Minimum rate sampling interval (in milliseconds)")               \
3754           range(0, max_intx)                                                \
3755                                                                             \
3756   product(intx, TieredRateUpdateMaxTime, 25,                                \
3757           "Maximum rate sampling interval (in milliseconds)")               \
3758           range(0, max_intx)                                                \
3759                                                                             \
3760   product_pd(bool, TieredCompilation,                                       \
3761           "Enable tiered compilation")                                      \
3762                                                                             \
3763   product(bool, PrintTieredEvents, false,                                   \
3764           "Print tiered events notifications")                              \
3765                                                                             \
3766   product_pd(intx, OnStackReplacePercentage,                                \
3767           "NON_TIERED number of method invocations/branches (expressed as " \
3768           "% of CompileThreshold) before (re-)compiling OSR code")          \
3769           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3770                                                                             \
3771   product(intx, InterpreterProfilePercentage, 33,                           \
3772           "NON_TIERED number of method invocations/branches (expressed as " \
3773           "% of CompileThreshold) before profiling in the interpreter")     \
3774           range(0, 100)                                                     \
3775                                                                             \
3776   develop(intx, MaxRecompilationSearchLength,    10,                        \
3777           "The maximum number of frames to inspect when searching for "     \
3778           "recompilee")                                                     \
3779                                                                             \
3780   develop(intx, MaxInterpretedSearchLength,     3,                          \
3781           "The maximum number of interpreted frames to skip when searching "\
3782           "for recompilee")                                                 \
3783                                                                             \
3784   develop(intx, DesiredMethodLimit,  8000,                                  \
3785           "The desired maximum method size (in bytecodes) after inlining")  \
3786                                                                             \
3787   develop(intx, HugeMethodLimit,  8000,                                     \
3788           "Don't compile methods larger than this if "                      \
3789           "+DontCompileHugeMethods")                                        \
3790                                                                             \
3791   /* New JDK 1.4 reflection implementation */                               \
3792                                                                             \
3793   develop(intx, FastSuperclassLimit, 8,                                     \
3794           "Depth of hardwired instanceof accelerator array")                \
3795                                                                             \
3796   /* Properties for Java libraries  */                                      \
3797                                                                             \
3798   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3799           "Maximum total size of NIO direct-buffer allocations")            \
3800           range(0, max_jlong)                                               \
3801                                                                             \
3802   /* Flags used for temporary code during development  */                   \
3803                                                                             \
3804   diagnostic(bool, UseNewCode, false,                                       \
3805           "Testing Only: Use the new version while testing")                \
3806                                                                             \
3807   diagnostic(bool, UseNewCode2, false,                                      \
3808           "Testing Only: Use the new version while testing")                \
3809                                                                             \
3810   diagnostic(bool, UseNewCode3, false,                                      \
3811           "Testing Only: Use the new version while testing")                \
3812                                                                             \
3813   /* flags for performance data collection */                               \
3814                                                                             \
3815   product(bool, UsePerfData, true,                                          \
3816           "Flag to disable jvmstat instrumentation for performance testing "\
3817           "and problem isolation purposes")                                 \
3818                                                                             \
3819   product(bool, PerfDataSaveToFile, false,                                  \
3820           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3821                                                                             \
3822   product(ccstr, PerfDataSaveFile, NULL,                                    \
3823           "Save PerfData memory to the specified absolute pathname. "       \
3824           "The string %p in the file name (if present) "                    \
3825           "will be replaced by pid")                                        \
3826                                                                             \
3827   product(intx, PerfDataSamplingInterval, 50,                               \
3828           "Data sampling interval (in milliseconds)")                       \
3829           range(PeriodicTask::min_interval, max_jint)                       \
3830           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3831                                                                             \
3832   product(bool, PerfDisableSharedMem, false,                                \
3833           "Store performance data in standard memory")                      \
3834                                                                             \
3835   product(intx, PerfDataMemorySize, 32*K,                                   \
3836           "Size of performance data memory region. Will be rounded "        \
3837           "up to a multiple of the native os page size.")                   \
3838           range(128, 32*64*K)                                               \
3839                                                                             \
3840   product(intx, PerfMaxStringConstLength, 1024,                             \
3841           "Maximum PerfStringConstant string length before truncation")     \
3842           range(32, 32*K)                                                   \
3843                                                                             \
3844   product(bool, PerfAllowAtExitRegistration, false,                         \
3845           "Allow registration of atexit() methods")                         \
3846                                                                             \
3847   product(bool, PerfBypassFileSystemCheck, false,                           \
3848           "Bypass Win32 file system criteria checks (Windows Only)")        \
3849                                                                             \
3850   product(intx, UnguardOnExecutionViolation, 0,                             \
3851           "Unguard page and retry on no-execute fault (Win32 only) "        \
3852           "0=off, 1=conservative, 2=aggressive")                            \
3853           range(0, 2)                                                       \
3854                                                                             \
3855   /* Serviceability Support */                                              \
3856                                                                             \
3857   product(bool, ManagementServer, false,                                    \
3858           "Create JMX Management Server")                                   \
3859                                                                             \
3860   product(bool, DisableAttachMechanism, false,                              \
3861           "Disable mechanism that allows tools to attach to this VM")       \
3862                                                                             \
3863   product(bool, StartAttachListener, false,                                 \
3864           "Always start Attach Listener at VM startup")                     \
3865                                                                             \
3866   product(bool, EnableDynamicAgentLoading, true,                            \
3867           "Allow tools to load agents with the attach mechanism")           \
3868                                                                             \
3869   manageable(bool, PrintConcurrentLocks, false,                             \
3870           "Print java.util.concurrent locks in thread dump")                \
3871                                                                             \
3872   product(bool, TransmitErrorReport, false,                                 \
3873           "Enable error report transmission on erroneous termination")      \
3874                                                                             \
3875   product(ccstr, ErrorReportServer, NULL,                                   \
3876           "Override built-in error report server address")                  \
3877                                                                             \
3878   /* Shared spaces */                                                       \
3879                                                                             \
3880   product(bool, UseSharedSpaces, true,                                      \
3881           "Use shared spaces for metadata")                                 \
3882                                                                             \
3883   product(bool, VerifySharedSpaces, false,                                  \
3884           "Verify shared spaces (false for default archive, true for "      \
3885           "archive specified by -XX:SharedArchiveFile)")                    \
3886                                                                             \
3887   product(bool, RequireSharedSpaces, false,                                 \
3888           "Require shared spaces for metadata")                             \
3889                                                                             \
3890   product(bool, DumpSharedSpaces, false,                                    \
3891           "Special mode: JVM reads a class list, loads classes, builds "    \
3892           "shared spaces, and dumps the shared spaces to a file to be "     \
3893           "used in future JVM runs")                                        \
3894                                                                             \
3895   product(bool, PrintSharedArchiveAndExit, false,                           \
3896           "Print shared archive file contents")                             \
3897                                                                             \
3898   product(bool, PrintSharedDictionary, false,                               \
3899           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3900           "dictionary")                                                     \
3901                                                                             \
3902   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3903           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3904           "Address to allocate shared memory region for class data")        \
3905           range(0, SIZE_MAX)                                                \
3906                                                                             \
3907   product(bool, UseAppCDS, false,                                           \
3908           "Enable Application Class Data Sharing when using shared spaces") \
3909           writeable(CommandLineOnly)                                        \
3910                                                                             \
3911   product(ccstr, SharedArchiveConfigFile, NULL,                             \
3912           "Data to add to the CDS archive file")                            \
3913                                                                             \
3914   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3915           "Average number of symbols per bucket in shared table")           \
3916           range(2, 246)                                                     \
3917                                                                             \
3918   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true,              \
3919           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3920           "classes. Just exclude them from the shared dictionary.")         \
3921                                                                             \
3922   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3923           "Print generated stub code for method handles")                   \
3924                                                                             \
3925   develop(bool, TraceMethodHandles, false,                                  \
3926           "trace internal method handle operations")                        \
3927                                                                             \
3928   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3929           "perform extra checks when constructing method handles")          \
3930                                                                             \
3931   diagnostic(bool, ShowHiddenFrames, false,                                 \
3932           "show method handle implementation frames (usually hidden)")      \
3933                                                                             \
3934   experimental(bool, TrustFinalNonStaticFields, false,                      \
3935           "trust final non-static declarations for constant folding")       \
3936                                                                             \
3937   diagnostic(bool, FoldStableValues, true,                                  \
3938           "Optimize loads from stable fields (marked w/ @Stable)")          \
3939                                                                             \
3940   develop(bool, TraceInvokeDynamic, false,                                  \
3941           "trace internal invoke dynamic operations")                       \
3942                                                                             \
3943   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
3944           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
3945           "resolved before the bootstrap method is called; 1: when a BSM "  \
3946           "that may accept a BootstrapCallInfo is detected, use that API "  \
3947           "to pass BSM arguments, which allows the BSM to delay their "     \
3948           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
3949           "via that API, instead of with the eagerly-resolved array.")      \
3950                                                                             \
3951   diagnostic(bool, PauseAtStartup,      false,                              \
3952           "Causes the VM to pause at startup time and wait for the pause "  \
3953           "file to be removed (default: ./vm.paused.<pid>)")                \
3954                                                                             \
3955   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3956           "The file to create and for whose removal to await when pausing " \
3957           "at startup. (default: ./vm.paused.<pid>)")                       \
3958                                                                             \
3959   diagnostic(bool, PauseAtExit, false,                                      \
3960           "Pause and wait for keypress on exit if a debugger is attached")  \
3961                                                                             \
3962   product(bool, ExtendedDTraceProbes,    false,                             \
3963           "Enable performance-impacting dtrace probes")                     \
3964                                                                             \
3965   product(bool, DTraceMethodProbes, false,                                  \
3966           "Enable dtrace probes for method-entry and method-exit")          \
3967                                                                             \
3968   product(bool, DTraceAllocProbes, false,                                   \
3969           "Enable dtrace probes for object allocation")                     \
3970                                                                             \
3971   product(bool, DTraceMonitorProbes, false,                                 \
3972           "Enable dtrace probes for monitor events")                        \
3973                                                                             \
3974   product(bool, RelaxAccessControlCheck, false,                             \
3975           "Relax the access control checks in the verifier")                \
3976                                                                             \
3977   product(uintx, StringTableSize, defaultStringTableSize,                   \
3978           "Number of buckets in the interned String table")                 \
3979           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3980                                                                             \
3981   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3982           "Number of buckets in the JVM internal Symbol table")             \
3983           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3984                                                                             \
3985   product(bool, UseStringDeduplication, false,                              \
3986           "Use string deduplication")                                       \
3987                                                                             \
3988   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3989           "A string must reach this age (or be promoted to an old region) " \
3990           "to be considered for deduplication")                             \
3991           range(1, markOopDesc::max_age)                                    \
3992                                                                             \
3993   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3994           "Force table resize every time the table is scanned")             \
3995                                                                             \
3996   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3997           "Force table rehash every time the table is scanned")             \
3998                                                                             \
3999   diagnostic(bool, WhiteBoxAPI, false,                                      \
4000           "Enable internal testing APIs")                                   \
4001                                                                             \
4002   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4003            "Default survivor space alignment in bytes")                     \
4004            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4005                                                                             \
4006   product(bool , AllowNonVirtualCalls, false,                               \
4007           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4008                                                                             \
4009   product(ccstr, DumpLoadedClassList, NULL,                                 \
4010           "Dump the names all loaded classes, that could be stored into "   \
4011           "the CDS archive, in the specified file")                         \
4012                                                                             \
4013   product(ccstr, SharedClassListFile, NULL,                                 \
4014           "Override the default CDS class list")                            \
4015                                                                             \
4016   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4017           "Override the default location of the CDS archive file")          \
4018                                                                             \
4019   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4020           "Extra classlist for building the CDS archive file")              \
4021                                                                             \
4022   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4023           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4024           "Allocation less than this value will be allocated "              \
4025           "using malloc. Larger allocations will use mmap.")                \
4026                                                                             \
4027   experimental(bool, AlwaysAtomicAccesses, false,                           \
4028           "Accesses to all variables should always be atomic")              \
4029                                                                             \
4030   product(bool, EnableTracing, false,                                       \
4031           "Enable event-based tracing")                                     \
4032                                                                             \
4033   product(bool, UseLockedTracing, false,                                    \
4034           "Use locked-tracing when doing event-based tracing")              \
4035                                                                             \
4036   diagnostic(bool, UseUnalignedAccesses, false,                             \
4037           "Use unaligned memory accesses in Unsafe")                        \
4038                                                                             \
4039   product_pd(bool, PreserveFramePointer,                                    \
4040              "Use the FP register for holding the frame pointer "           \
4041              "and not as a general purpose register.")                      \
4042                                                                             \
4043   diagnostic(bool, CheckIntrinsics, true,                                   \
4044              "When a class C is loaded, check that "                        \
4045              "(1) all intrinsics defined by the VM for class C are present "\
4046              "in the loaded class file and are marked with the "            \
4047              "@HotSpotIntrinsicCandidate annotation, that "                 \
4048              "(2) there is an intrinsic registered for all loaded methods " \
4049              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4050              "annotation, and that "                                        \
4051              "(3) no orphan methods exist for class C (i.e., methods for "  \
4052              "which the VM declares an intrinsic but that are not declared "\
4053              "in the loaded class C. "                                      \
4054              "Check (3) is available only in debug builds.")                \
4055                                                                             \
4056   diagnostic_pd(intx, InitArrayShortSize,                                   \
4057           "Threshold small size (in bytes) for clearing arrays. "           \
4058           "Anything this size or smaller may get converted to discrete "    \
4059           "scalar stores.")                                                 \
4060           range(0, max_intx)                                                \
4061           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4062                                                                             \
4063   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4064              "Disable backwards compatibility for compile commands.")       \
4065                                                                             \
4066   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4067              "Print compiler directives on installation.")                  \
4068   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4069              "Limit on number of compiler directives.")                     \
4070                                                                             \
4071   product(ccstr, AllocateHeapAt, NULL,                                      \
4072           "Path to the directoy where a temporary file will be created "    \
4073           "to use as the backing store for Java Heap.")                     \
4074                                                                             \
4075   develop(bool, VerifyMetaspace, false,                                     \
4076           "Verify metaspace on chunk movements.")                           \
4077                                                                             \
4078 
4079 
4080 
4081 /*
4082  *  Macros for factoring of globals
4083  */
4084 
4085 // Interface macros
4086 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4087 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4088 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4089 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4090 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4091 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4092 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4093 #ifdef PRODUCT
4094 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4095 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4096 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4097 #else
4098 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4099 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4100 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4101 #endif // PRODUCT
4102 // Special LP64 flags, product only needed for now.
4103 #ifdef _LP64
4104 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4105 #else
4106 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4107 #endif // _LP64
4108 
4109 // Implementation macros
4110 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4111 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4112 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4113 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4114 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4115 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4116 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4117 #ifdef PRODUCT
4118 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4119 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4120 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4121 #else
4122 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4123 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4124 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4125 #endif // PRODUCT
4126 #ifdef _LP64
4127 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4128 #else
4129 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4130 #endif // _LP64
4131 
4132 // Only materialize src code for range checking when required, ignore otherwise
4133 #define IGNORE_RANGE(a, b)
4134 // Only materialize src code for contraint checking when required, ignore otherwise
4135 #define IGNORE_CONSTRAINT(func,type)
4136 
4137 #define IGNORE_WRITEABLE(type)
4138 
4139 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4140               DECLARE_PD_DEVELOPER_FLAG, \
4141               DECLARE_PRODUCT_FLAG, \
4142               DECLARE_PD_PRODUCT_FLAG, \
4143               DECLARE_DIAGNOSTIC_FLAG, \
4144               DECLARE_PD_DIAGNOSTIC_FLAG, \
4145               DECLARE_EXPERIMENTAL_FLAG, \
4146               DECLARE_NOTPRODUCT_FLAG, \
4147               DECLARE_MANAGEABLE_FLAG, \
4148               DECLARE_PRODUCT_RW_FLAG, \
4149               DECLARE_LP64_PRODUCT_FLAG, \
4150               IGNORE_RANGE, \
4151               IGNORE_CONSTRAINT, \
4152               IGNORE_WRITEABLE)
4153 
4154 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4155                  DECLARE_PD_DEVELOPER_FLAG, \
4156                  DECLARE_PRODUCT_FLAG, \
4157                  DECLARE_PD_PRODUCT_FLAG, \
4158                  DECLARE_DIAGNOSTIC_FLAG, \
4159                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4160                  DECLARE_NOTPRODUCT_FLAG, \
4161                  IGNORE_RANGE, \
4162                  IGNORE_CONSTRAINT, \
4163                  IGNORE_WRITEABLE)
4164 
4165 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4166            DECLARE_PRODUCT_FLAG, \
4167            DECLARE_DIAGNOSTIC_FLAG, \
4168            DECLARE_EXPERIMENTAL_FLAG, \
4169            DECLARE_NOTPRODUCT_FLAG, \
4170            IGNORE_RANGE, \
4171            IGNORE_CONSTRAINT, \
4172            IGNORE_WRITEABLE)
4173 
4174 // Extensions
4175 
4176 #include "runtime/globals_ext.hpp"
4177 
4178 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP