1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 #include <float.h> // for DBL_MAX
  32 
  33 // use this for flags that are true per default in the tiered build
  34 // but false in non-tiered builds, and vice versa
  35 #ifdef TIERED
  36 #define  trueInTiered true
  37 #define falseInTiered false
  38 #else
  39 #define  trueInTiered false
  40 #define falseInTiered true
  41 #endif
  42 
  43 #include CPU_HEADER(globals)
  44 #include OS_HEADER(globals)
  45 #include OS_CPU_HEADER(globals)
  46 #ifdef COMPILER1
  47 #include CPU_HEADER(c1_globals)
  48 #include OS_HEADER(c1_globals)
  49 #endif
  50 #ifdef COMPILER2
  51 #include CPU_HEADER(c2_globals)
  52 #include OS_HEADER(c2_globals)
  53 #endif
  54 #ifdef SHARK
  55 #ifdef ZERO
  56 # include "shark_globals_zero.hpp"
  57 #endif
  58 #endif
  59 
  60 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
  61 define_pd_global(bool, BackgroundCompilation,        false);
  62 define_pd_global(bool, UseTLAB,                      false);
  63 define_pd_global(bool, CICompileOSR,                 false);
  64 define_pd_global(bool, UseTypeProfile,               false);
  65 define_pd_global(bool, UseOnStackReplacement,        false);
  66 define_pd_global(bool, InlineIntrinsics,             false);
  67 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  68 define_pd_global(bool, ProfileInterpreter,           false);
  69 define_pd_global(bool, ProfileTraps,                 false);
  70 define_pd_global(bool, TieredCompilation,            false);
  71 
  72 define_pd_global(intx, CompileThreshold,             0);
  73 
  74 define_pd_global(intx, OnStackReplacePercentage,     0);
  75 define_pd_global(bool, ResizeTLAB,                   false);
  76 define_pd_global(intx, FreqInlineSize,               0);
  77 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  78 define_pd_global(intx, InlineClassNatives,           true);
  79 define_pd_global(intx, InlineUnsafeOps,              true);
  80 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  81 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  82 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
  83 define_pd_global(intx, ProfiledCodeHeapSize,         0);
  84 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
  85 
  86 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  87 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  88 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
  89 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  90 define_pd_global(bool, NeverActAsServerClassMachine, true);
  91 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
  92 #define CI_COMPILER_COUNT 0
  93 #else
  94 
  95 #if defined(COMPILER2) || INCLUDE_JVMCI
  96 #define CI_COMPILER_COUNT 2
  97 #else
  98 #define CI_COMPILER_COUNT 1
  99 #endif // COMPILER2 || INCLUDE_JVMCI
 100 
 101 #endif // no compilers
 102 
 103 // string type aliases used only in this file
 104 typedef const char* ccstr;
 105 typedef const char* ccstrlist;   // represents string arguments which accumulate
 106 
 107 // function type that will construct default range string
 108 typedef const char* (*RangeStrFunc)(void);
 109 
 110 struct Flag {
 111   enum Flags {
 112     // latest value origin
 113     DEFAULT          = 0,
 114     COMMAND_LINE     = 1,
 115     ENVIRON_VAR      = 2,
 116     CONFIG_FILE      = 3,
 117     MANAGEMENT       = 4,
 118     ERGONOMIC        = 5,
 119     ATTACH_ON_DEMAND = 6,
 120     INTERNAL         = 7,
 121 
 122     LAST_VALUE_ORIGIN = INTERNAL,
 123     VALUE_ORIGIN_BITS = 4,
 124     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 125 
 126     // flag kind
 127     KIND_PRODUCT            = 1 << 4,
 128     KIND_MANAGEABLE         = 1 << 5,
 129     KIND_DIAGNOSTIC         = 1 << 6,
 130     KIND_EXPERIMENTAL       = 1 << 7,
 131     KIND_NOT_PRODUCT        = 1 << 8,
 132     KIND_DEVELOP            = 1 << 9,
 133     KIND_PLATFORM_DEPENDENT = 1 << 10,
 134     KIND_READ_WRITE         = 1 << 11,
 135     KIND_C1                 = 1 << 12,
 136     KIND_C2                 = 1 << 13,
 137     KIND_ARCH               = 1 << 14,
 138     KIND_SHARK              = 1 << 15,
 139     KIND_LP64_PRODUCT       = 1 << 16,
 140     KIND_COMMERCIAL         = 1 << 17,
 141     KIND_JVMCI              = 1 << 18,
 142 
 143     // set this bit if the flag was set on the command line
 144     ORIG_COMMAND_LINE       = 1 << 19,
 145 
 146     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 147   };
 148 
 149   enum Error {
 150     // no error
 151     SUCCESS = 0,
 152     // flag name is missing
 153     MISSING_NAME,
 154     // flag value is missing
 155     MISSING_VALUE,
 156     // error parsing the textual form of the value
 157     WRONG_FORMAT,
 158     // flag is not writable
 159     NON_WRITABLE,
 160     // flag value is outside of its bounds
 161     OUT_OF_BOUNDS,
 162     // flag value violates its constraint
 163     VIOLATES_CONSTRAINT,
 164     // there is no flag with the given name
 165     INVALID_FLAG,
 166     // the flag can only be set only on command line during invocation of the VM
 167     COMMAND_LINE_ONLY,
 168     // the flag may only be set once
 169     SET_ONLY_ONCE,
 170     // the flag is not writable in this combination of product/debug build
 171     CONSTANT,
 172     // other, unspecified error related to setting the flag
 173     ERR_OTHER
 174   };
 175 
 176   enum MsgType {
 177     NONE = 0,
 178     DIAGNOSTIC_FLAG_BUT_LOCKED,
 179     EXPERIMENTAL_FLAG_BUT_LOCKED,
 180     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 181     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 182   };
 183 
 184   const char* _type;
 185   const char* _name;
 186   void* _addr;
 187   NOT_PRODUCT(const char* _doc;)
 188   Flags _flags;
 189 
 190   // points to all Flags static array
 191   static Flag* flags;
 192 
 193   // number of flags
 194   static size_t numFlags;
 195 
 196   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 197   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 198   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 199 
 200   static const char* get_int_default_range_str();
 201   static const char* get_uint_default_range_str();
 202   static const char* get_intx_default_range_str();
 203   static const char* get_uintx_default_range_str();
 204   static const char* get_uint64_t_default_range_str();
 205   static const char* get_size_t_default_range_str();
 206   static const char* get_double_default_range_str();
 207 
 208   Flag::Error check_writable(bool changed);
 209 
 210   bool is_bool() const;
 211   bool get_bool() const;
 212   Flag::Error set_bool(bool value);
 213 
 214   bool is_int() const;
 215   int get_int() const;
 216   Flag::Error set_int(int value);
 217 
 218   bool is_uint() const;
 219   uint get_uint() const;
 220   Flag::Error set_uint(uint value);
 221 
 222   bool is_intx() const;
 223   intx get_intx() const;
 224   Flag::Error set_intx(intx value);
 225 
 226   bool is_uintx() const;
 227   uintx get_uintx() const;
 228   Flag::Error set_uintx(uintx value);
 229 
 230   bool is_uint64_t() const;
 231   uint64_t get_uint64_t() const;
 232   Flag::Error set_uint64_t(uint64_t value);
 233 
 234   bool is_size_t() const;
 235   size_t get_size_t() const;
 236   Flag::Error set_size_t(size_t value);
 237 
 238   bool is_double() const;
 239   double get_double() const;
 240   Flag::Error set_double(double value);
 241 
 242   bool is_ccstr() const;
 243   bool ccstr_accumulates() const;
 244   ccstr get_ccstr() const;
 245   Flag::Error set_ccstr(ccstr value);
 246 
 247   Flags get_origin();
 248   void set_origin(Flags origin);
 249 
 250   bool is_default();
 251   bool is_ergonomic();
 252   bool is_command_line();
 253   void set_command_line();
 254 
 255   bool is_product() const;
 256   bool is_manageable() const;
 257   bool is_diagnostic() const;
 258   bool is_experimental() const;
 259   bool is_notproduct() const;
 260   bool is_develop() const;
 261   bool is_read_write() const;
 262   bool is_commercial() const;
 263 
 264   bool is_constant_in_binary() const;
 265 
 266   bool is_unlocker() const;
 267   bool is_unlocked() const;
 268   bool is_writeable() const;
 269   bool is_external() const;
 270 
 271   bool is_unlocker_ext() const;
 272   bool is_unlocked_ext() const;
 273   bool is_writeable_ext() const;
 274   bool is_external_ext() const;
 275 
 276   void unlock_diagnostic();
 277 
 278   Flag::MsgType get_locked_message(char*, int) const;
 279   void get_locked_message_ext(char*, int) const;
 280 
 281   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 282   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 283   void print_kind_and_origin(outputStream* st);
 284   void print_as_flag(outputStream* st);
 285 
 286   static const char* flag_error_str(Flag::Error error);
 287 };
 288 
 289 // debug flags control various aspects of the VM and are global accessible
 290 
 291 // use FlagSetting to temporarily change some debug flag
 292 // e.g. FlagSetting fs(DebugThisAndThat, true);
 293 // restored to previous value upon leaving scope
 294 class FlagSetting {
 295   bool val;
 296   bool* flag;
 297  public:
 298   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 299   ~FlagSetting()                       { *flag = val; }
 300 };
 301 
 302 
 303 class CounterSetting {
 304   intx* counter;
 305  public:
 306   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 307   ~CounterSetting()         { (*counter)--; }
 308 };
 309 
 310 class IntFlagSetting {
 311   int val;
 312   int* flag;
 313  public:
 314   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 315   ~IntFlagSetting()                     { *flag = val; }
 316 };
 317 
 318 class UIntFlagSetting {
 319   uint val;
 320   uint* flag;
 321  public:
 322   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 323   ~UIntFlagSetting()                       { *flag = val; }
 324 };
 325 
 326 class UIntXFlagSetting {
 327   uintx val;
 328   uintx* flag;
 329  public:
 330   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 331   ~UIntXFlagSetting()                         { *flag = val; }
 332 };
 333 
 334 class DoubleFlagSetting {
 335   double val;
 336   double* flag;
 337  public:
 338   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 339   ~DoubleFlagSetting()                           { *flag = val; }
 340 };
 341 
 342 class SizeTFlagSetting {
 343   size_t val;
 344   size_t* flag;
 345  public:
 346   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 347   ~SizeTFlagSetting()                           { *flag = val; }
 348 };
 349 
 350 // Helper class for temporarily saving the value of a flag during a scope.
 351 template <size_t SIZE>
 352 class FlagGuard {
 353   unsigned char _value[SIZE];
 354   void* const _addr;
 355 
 356   // Hide operator new, this class should only be allocated on the stack.
 357   // NOTE: Cannot include memory/allocation.hpp here due to circular
 358   //       dependencies.
 359   void* operator new(size_t size) throw();
 360   void* operator new [](size_t size) throw();
 361 
 362  public:
 363   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 364     memcpy(_value, _addr, SIZE);
 365   }
 366 
 367   ~FlagGuard() {
 368     memcpy(_addr, _value, SIZE);
 369   }
 370 };
 371 
 372 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 373 
 374 class CommandLineFlags {
 375 public:
 376   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 377   static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 378   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 379   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 380   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 381 
 382   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 383   static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false)      { return intAt(name, strlen(name), value, allow_locked, return_flag); }
 384   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 385   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 386   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 387 
 388   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 389   static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 390   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 391   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 392   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 393 
 394   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 395   static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 396   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 397   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 398   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 399 
 400   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 401   static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 402   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 403   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 404   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 405 
 406   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 407   static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false)    { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
 408   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 409   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 410   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 411 
 412   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 413   static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
 414   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 415   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 416   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 417 
 418   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 419   static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 420   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 421   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 422   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 423 
 424   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 425   static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 426   // Contract:  Flag will make private copy of the incoming value.
 427   // Outgoing value is always malloc-ed, and caller MUST call free.
 428   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 429   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 430 
 431   // Returns false if name is not a command line flag.
 432   static bool wasSetOnCmdline(const char* name, bool* value);
 433   static void printSetFlags(outputStream* out);
 434 
 435   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 436   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 437 
 438   static void verify() PRODUCT_RETURN;
 439 };
 440 
 441 // use this for flags that are true by default in the debug version but
 442 // false in the optimized version, and vice versa
 443 #ifdef ASSERT
 444 #define trueInDebug  true
 445 #define falseInDebug false
 446 #else
 447 #define trueInDebug  false
 448 #define falseInDebug true
 449 #endif
 450 
 451 // use this for flags that are true per default in the product build
 452 // but false in development builds, and vice versa
 453 #ifdef PRODUCT
 454 #define trueInProduct  true
 455 #define falseInProduct false
 456 #else
 457 #define trueInProduct  false
 458 #define falseInProduct true
 459 #endif
 460 
 461 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 462 // product flags are always settable / visible
 463 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 464 
 465 // A flag must be declared with one of the following types:
 466 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 467 // The type "ccstr" is an alias for "const char*" and is used
 468 // only in this file, because the macrology requires single-token type names.
 469 
 470 // Note: Diagnostic options not meant for VM tuning or for product modes.
 471 // They are to be used for VM quality assurance or field diagnosis
 472 // of VM bugs.  They are hidden so that users will not be encouraged to
 473 // try them as if they were VM ordinary execution options.  However, they
 474 // are available in the product version of the VM.  Under instruction
 475 // from support engineers, VM customers can turn them on to collect
 476 // diagnostic information about VM problems.  To use a VM diagnostic
 477 // option, you must first specify +UnlockDiagnosticVMOptions.
 478 // (This master switch also affects the behavior of -Xprintflags.)
 479 //
 480 // experimental flags are in support of features that are not
 481 //    part of the officially supported product, but are available
 482 //    for experimenting with. They could, for example, be performance
 483 //    features that may not have undergone full or rigorous QA, but which may
 484 //    help performance in some cases and released for experimentation
 485 //    by the community of users and developers. This flag also allows one to
 486 //    be able to build a fully supported product that nonetheless also
 487 //    ships with some unsupported, lightly tested, experimental features.
 488 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 489 //    UnlockExperimentalVMOptions flag, which allows the control and
 490 //    modification of the experimental flags.
 491 //
 492 // Nota bene: neither diagnostic nor experimental options should be used casually,
 493 //    and they are not supported on production loads, except under explicit
 494 //    direction from support engineers.
 495 //
 496 // manageable flags are writeable external product flags.
 497 //    They are dynamically writeable through the JDK management interface
 498 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 499 //    These flags are external exported interface (see CCC).  The list of
 500 //    manageable flags can be queried programmatically through the management
 501 //    interface.
 502 //
 503 //    A flag can be made as "manageable" only if
 504 //    - the flag is defined in a CCC as an external exported interface.
 505 //    - the VM implementation supports dynamic setting of the flag.
 506 //      This implies that the VM must *always* query the flag variable
 507 //      and not reuse state related to the flag state at any given time.
 508 //    - you want the flag to be queried programmatically by the customers.
 509 //
 510 // product_rw flags are writeable internal product flags.
 511 //    They are like "manageable" flags but for internal/private use.
 512 //    The list of product_rw flags are internal/private flags which
 513 //    may be changed/removed in a future release.  It can be set
 514 //    through the management interface to get/set value
 515 //    when the name of flag is supplied.
 516 //
 517 //    A flag can be made as "product_rw" only if
 518 //    - the VM implementation supports dynamic setting of the flag.
 519 //      This implies that the VM must *always* query the flag variable
 520 //      and not reuse state related to the flag state at any given time.
 521 //
 522 // Note that when there is a need to support develop flags to be writeable,
 523 // it can be done in the same way as product_rw.
 524 //
 525 // range is a macro that will expand to min and max arguments for range
 526 //    checking code if provided - see commandLineFlagRangeList.hpp
 527 //
 528 // constraint is a macro that will expand to custom function call
 529 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 530 //
 531 // writeable is a macro that controls if and how the value can change during the runtime
 532 //
 533 // writeable(Always) is optional and allows the flag to have its value changed
 534 //    without any limitations at any time
 535 //
 536 // writeable(Once) flag value's can be only set once during the lifetime of VM
 537 //
 538 // writeable(CommandLineOnly) flag value's can be only set from command line
 539 //    (multiple times allowed)
 540 //
 541 
 542 
 543 #define RUNTIME_FLAGS(develop, \
 544                       develop_pd, \
 545                       product, \
 546                       product_pd, \
 547                       diagnostic, \
 548                       diagnostic_pd, \
 549                       experimental, \
 550                       notproduct, \
 551                       manageable, \
 552                       product_rw, \
 553                       lp64_product, \
 554                       range, \
 555                       constraint, \
 556                       writeable) \
 557                                                                             \
 558   lp64_product(bool, UseCompressedOops, false,                              \
 559           "Use 32-bit object references in 64-bit VM. "                     \
 560           "lp64_product means flag is always constant in 32 bit VM")        \
 561                                                                             \
 562   lp64_product(bool, UseCompressedClassPointers, false,                     \
 563           "Use 32-bit class pointers in 64-bit VM. "                        \
 564           "lp64_product means flag is always constant in 32 bit VM")        \
 565                                                                             \
 566   notproduct(bool, CheckCompressedOops, true,                               \
 567           "Generate checks in encoding/decoding code in debug VM")          \
 568                                                                             \
 569   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 570           "Heap allocation steps through preferred address regions to find" \
 571           " where it can allocate the heap. Number of steps to take per "   \
 572           "region.")                                                        \
 573           range(1, max_uintx)                                               \
 574                                                                             \
 575   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 576           "Default object alignment in bytes, 8 is minimum")                \
 577           range(8, 256)                                                     \
 578           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 579                                                                             \
 580   product(bool, AssumeMP, false,                                            \
 581           "Instruct the VM to assume multiple processors are available")    \
 582                                                                             \
 583   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 584   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 585   /* been re-added (see 6401008)                                         */ \
 586   product_pd(bool, UseMembar,                                               \
 587           "(Unstable) Issues membars on thread state transitions")          \
 588                                                                             \
 589   develop(bool, CleanChunkPoolAsync, true,                                  \
 590           "Clean the chunk pool asynchronously")                            \
 591                                                                             \
 592   experimental(bool, AlwaysSafeConstructors, false,                         \
 593           "Force safe construction, as if all fields are final.")           \
 594                                                                             \
 595   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 596           "Enable normal processing of flags relating to field diagnostics")\
 597                                                                             \
 598   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 599           "Enable normal processing of flags relating to experimental "     \
 600           "features")                                                       \
 601                                                                             \
 602   product(bool, JavaMonitorsInStackTrace, true,                             \
 603           "Print information about Java monitor locks when the stacks are"  \
 604           "dumped")                                                         \
 605                                                                             \
 606   product_pd(bool, UseLargePages,                                           \
 607           "Use large page memory")                                          \
 608                                                                             \
 609   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 610           "Allocate large pages individually for better affinity")          \
 611                                                                             \
 612   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 613           "Fail large pages individual allocation")                         \
 614                                                                             \
 615   product(bool, UseLargePagesInMetaspace, false,                            \
 616           "Use large page memory in metaspace. "                            \
 617           "Only used if UseLargePages is enabled.")                         \
 618                                                                             \
 619   product(bool, UseNUMA, false,                                             \
 620           "Use NUMA if available")                                          \
 621                                                                             \
 622   product(bool, UseNUMAInterleaving, false,                                 \
 623           "Interleave memory across NUMA nodes if available")               \
 624                                                                             \
 625   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 626           "Granularity to use for NUMA interleaving on Windows OS")         \
 627           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 628                                                                             \
 629   product(bool, ForceNUMA, false,                                           \
 630           "Force NUMA optimizations on single-node/UMA systems")            \
 631                                                                             \
 632   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 633           "Percentage (0-100) used to weight the current sample when "      \
 634           "computing exponentially decaying average for "                   \
 635           "AdaptiveNUMAChunkSizing")                                        \
 636           range(0, 100)                                                     \
 637                                                                             \
 638   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 639           "Do not reallocate more than this amount per collection")         \
 640           range(0, max_uintx)                                               \
 641                                                                             \
 642   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 643           "Enable adaptive chunk sizing for NUMA")                          \
 644                                                                             \
 645   product(bool, NUMAStats, false,                                           \
 646           "Print NUMA stats in detailed heap information")                  \
 647                                                                             \
 648   product(uintx, NUMAPageScanRate, 256,                                     \
 649           "Maximum number of pages to include in the page scan procedure")  \
 650           range(0, max_uintx)                                               \
 651                                                                             \
 652   product_pd(bool, NeedsDeoptSuspend,                                       \
 653           "True for register window machines (sparc/ia64)")                 \
 654                                                                             \
 655   product(intx, UseSSE, 99,                                                 \
 656           "Highest supported SSE instructions set on x86/x64")              \
 657           range(0, 99)                                                      \
 658                                                                             \
 659   product(bool, UseAES, false,                                              \
 660           "Control whether AES instructions can be used on x86/x64")        \
 661                                                                             \
 662   product(bool, UseSHA, false,                                              \
 663           "Control whether SHA instructions can be used "                   \
 664           "on SPARC, on ARM and on x86")                                    \
 665                                                                             \
 666   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 667           "Use intrinsics for GHASH versions of crypto")                    \
 668                                                                             \
 669   product(size_t, LargePageSizeInBytes, 0,                                  \
 670           "Large page size (0 to let VM choose the page size)")             \
 671           range(0, max_uintx)                                               \
 672                                                                             \
 673   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 674           "Use large pages if maximum heap is at least this big")           \
 675           range(0, max_uintx)                                               \
 676                                                                             \
 677   product(bool, ForceTimeHighResolution, false,                             \
 678           "Using high time resolution (for Win32 only)")                    \
 679                                                                             \
 680   develop(bool, TracePcPatching, false,                                     \
 681           "Trace usage of frame::patch_pc")                                 \
 682                                                                             \
 683   develop(bool, TraceRelocator, false,                                      \
 684           "Trace the bytecode relocator")                                   \
 685                                                                             \
 686   develop(bool, TraceLongCompiles, false,                                   \
 687           "Print out every time compilation is longer than "                \
 688           "a given threshold")                                              \
 689                                                                             \
 690   develop(bool, SafepointALot, false,                                       \
 691           "Generate a lot of safepoints. This works with "                  \
 692           "GuaranteedSafepointInterval")                                    \
 693                                                                             \
 694   product_pd(bool, BackgroundCompilation,                                   \
 695           "A thread requesting compilation is not blocked during "          \
 696           "compilation")                                                    \
 697                                                                             \
 698   product(bool, PrintVMQWaitTime, false,                                    \
 699           "Print out the waiting time in VM operation queue")               \
 700                                                                             \
 701   develop(bool, TraceOopMapGeneration, false,                               \
 702           "Show OopMapGeneration")                                          \
 703                                                                             \
 704   product(bool, MethodFlushing, true,                                       \
 705           "Reclamation of zombie and not-entrant methods")                  \
 706                                                                             \
 707   develop(bool, VerifyStack, false,                                         \
 708           "Verify stack of each thread when it is entering a runtime call") \
 709                                                                             \
 710   diagnostic(bool, ForceUnreachable, false,                                 \
 711           "Make all non code cache addresses to be unreachable by "         \
 712           "forcing use of 64bit literal fixups")                            \
 713                                                                             \
 714   notproduct(bool, StressDerivedPointers, false,                            \
 715           "Force scavenge when a derived pointer is detected on stack "     \
 716           "after rtm call")                                                 \
 717                                                                             \
 718   develop(bool, TraceDerivedPointers, false,                                \
 719           "Trace traversal of derived pointers on stack")                   \
 720                                                                             \
 721   notproduct(bool, TraceCodeBlobStacks, false,                              \
 722           "Trace stack-walk of codeblobs")                                  \
 723                                                                             \
 724   product(bool, PrintJNIResolving, false,                                   \
 725           "Used to implement -v:jni")                                       \
 726                                                                             \
 727   notproduct(bool, PrintRewrites, false,                                    \
 728           "Print methods that are being rewritten")                         \
 729                                                                             \
 730   product(bool, UseInlineCaches, true,                                      \
 731           "Use Inline Caches for virtual calls ")                           \
 732                                                                             \
 733   diagnostic(bool, InlineArrayCopy, true,                                   \
 734           "Inline arraycopy native that is known to be part of "            \
 735           "base library DLL")                                               \
 736                                                                             \
 737   diagnostic(bool, InlineObjectHash, true,                                  \
 738           "Inline Object::hashCode() native that is known to be part "      \
 739           "of base library DLL")                                            \
 740                                                                             \
 741   diagnostic(bool, InlineNatives, true,                                     \
 742           "Inline natives that are known to be part of base library DLL")   \
 743                                                                             \
 744   diagnostic(bool, InlineMathNatives, true,                                 \
 745           "Inline SinD, CosD, etc.")                                        \
 746                                                                             \
 747   diagnostic(bool, InlineClassNatives, true,                                \
 748           "Inline Class.isInstance, etc")                                   \
 749                                                                             \
 750   diagnostic(bool, InlineThreadNatives, true,                               \
 751           "Inline Thread.currentThread, etc")                               \
 752                                                                             \
 753   diagnostic(bool, InlineUnsafeOps, true,                                   \
 754           "Inline memory ops (native methods) from Unsafe")                 \
 755                                                                             \
 756   product(bool, CriticalJNINatives, true,                                   \
 757           "Check for critical JNI entry points")                            \
 758                                                                             \
 759   notproduct(bool, StressCriticalJNINatives, false,                         \
 760           "Exercise register saving code in critical natives")              \
 761                                                                             \
 762   diagnostic(bool, UseAESIntrinsics, false,                                 \
 763           "Use intrinsics for AES versions of crypto")                      \
 764                                                                             \
 765   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 766           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 767                                                                             \
 768   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 769           "Use intrinsics for SHA-1 crypto hash function. "                 \
 770           "Requires that UseSHA is enabled.")                               \
 771                                                                             \
 772   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 773           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 774           "Requires that UseSHA is enabled.")                               \
 775                                                                             \
 776   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 777           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 778           "Requires that UseSHA is enabled.")                               \
 779                                                                             \
 780   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 781           "use intrinsics for java.util.zip.CRC32")                         \
 782                                                                             \
 783   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 784           "use intrinsics for java.util.zip.CRC32C")                        \
 785                                                                             \
 786   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 787           "use intrinsics for java.util.zip.Adler32")                       \
 788                                                                             \
 789   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 790           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 791                                                                             \
 792   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 793          "do not expand intrinsics whose (internal) names appear here")     \
 794                                                                             \
 795   develop(bool, TraceCallFixup, false,                                      \
 796           "Trace all call fixups")                                          \
 797                                                                             \
 798   develop(bool, DeoptimizeALot, false,                                      \
 799           "Deoptimize at every exit from the runtime system")               \
 800                                                                             \
 801   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 802           "A comma separated list of bcis to deoptimize at")                \
 803                                                                             \
 804   product(bool, DeoptimizeRandom, false,                                    \
 805           "Deoptimize random frames on random exit from the runtime system")\
 806                                                                             \
 807   notproduct(bool, ZombieALot, false,                                       \
 808           "Create zombies (non-entrant) at exit from the runtime system")   \
 809                                                                             \
 810   product(bool, UnlinkSymbolsALot, false,                                   \
 811           "Unlink unreferenced symbols from the symbol table at safepoints")\
 812                                                                             \
 813   notproduct(bool, WalkStackALot, false,                                    \
 814           "Trace stack (no print) at every exit from the runtime system")   \
 815                                                                             \
 816   product(bool, Debugging, false,                                           \
 817           "Set when executing debug methods in debug.cpp "                  \
 818           "(to prevent triggering assertions)")                             \
 819                                                                             \
 820   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 821           "Enable strict checks that safepoints cannot happen for threads " \
 822           "that use NoSafepointVerifier")                                   \
 823                                                                             \
 824   notproduct(bool, VerifyLastFrame, false,                                  \
 825           "Verify oops on last frame on entry to VM")                       \
 826                                                                             \
 827   product(bool, FailOverToOldVerifier, true,                                \
 828           "Fail over to old verifier when split verifier fails")            \
 829                                                                             \
 830   develop(bool, ShowSafepointMsgs, false,                                   \
 831           "Show message about safepoint synchronization")                   \
 832                                                                             \
 833   product(bool, SafepointTimeout, false,                                    \
 834           "Time out and warn or fail after SafepointTimeoutDelay "          \
 835           "milliseconds if failed to reach safepoint")                      \
 836                                                                             \
 837   develop(bool, DieOnSafepointTimeout, false,                               \
 838           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 839                                                                             \
 840   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 841   /* typically, at most a few retries are needed                    */      \
 842   product(intx, SuspendRetryCount, 50,                                      \
 843           "Maximum retry count for an external suspend request")            \
 844           range(0, max_intx)                                                \
 845                                                                             \
 846   product(intx, SuspendRetryDelay, 5,                                       \
 847           "Milliseconds to delay per retry (* current_retry_count)")        \
 848           range(0, max_intx)                                                \
 849                                                                             \
 850   product(bool, AssertOnSuspendWaitFailure, false,                          \
 851           "Assert/Guarantee on external suspend wait failure")              \
 852                                                                             \
 853   product(bool, TraceSuspendWaitFailures, false,                            \
 854           "Trace external suspend wait failures")                           \
 855                                                                             \
 856   product(bool, MaxFDLimit, true,                                           \
 857           "Bump the number of file descriptors to maximum in Solaris")      \
 858                                                                             \
 859   diagnostic(bool, LogEvents, true,                                         \
 860           "Enable the various ring buffer event logs")                      \
 861                                                                             \
 862   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 863           "Number of ring buffer event logs")                               \
 864           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 865                                                                             \
 866   product(bool, BytecodeVerificationRemote, true,                           \
 867           "Enable the Java bytecode verifier for remote classes")           \
 868                                                                             \
 869   product(bool, BytecodeVerificationLocal, false,                           \
 870           "Enable the Java bytecode verifier for local classes")            \
 871                                                                             \
 872   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 873           "Force exceptions on FP stack under/overflow")                    \
 874                                                                             \
 875   develop(bool, VerifyStackAtCalls, false,                                  \
 876           "Verify that the stack pointer is unchanged after calls")         \
 877                                                                             \
 878   develop(bool, TraceJavaAssertions, false,                                 \
 879           "Trace java language assertions")                                 \
 880                                                                             \
 881   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 882           "Temporary - see javaClasses.cpp")                                \
 883                                                                             \
 884   notproduct(bool, PrintMallocFree, false,                                  \
 885           "Trace calls to C heap malloc/free allocation")                   \
 886                                                                             \
 887   notproduct(bool, VerifyCodeCache, false,                                  \
 888           "Verify code cache on memory allocation/deallocation")            \
 889                                                                             \
 890   develop(bool, UseMallocOnly, false,                                       \
 891           "Use only malloc/free for allocation (no resource area/arena)")   \
 892                                                                             \
 893   develop(bool, PrintMalloc, false,                                         \
 894           "Print all malloc/free calls")                                    \
 895                                                                             \
 896   develop(bool, PrintMallocStatistics, false,                               \
 897           "Print malloc/free statistics")                                   \
 898                                                                             \
 899   develop(bool, ZapResourceArea, trueInDebug,                               \
 900           "Zap freed resource/arena space with 0xABABABAB")                 \
 901                                                                             \
 902   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 903           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 904                                                                             \
 905   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 906           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 907                                                                             \
 908   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 909           "Zap allocated/freed stack segments with 0xFADFADED")             \
 910                                                                             \
 911   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 912           "Zap unused heap space with 0xBAADBABE")                          \
 913                                                                             \
 914   develop(bool, CheckZapUnusedHeapArea, false,                              \
 915           "Check zapping of unused heap space")                             \
 916                                                                             \
 917   develop(bool, ZapFillerObjects, trueInDebug,                              \
 918           "Zap filler objects with 0xDEAFBABE")                             \
 919                                                                             \
 920   develop(bool, PrintVMMessages, true,                                      \
 921           "Print VM messages on console")                                   \
 922                                                                             \
 923   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 924           "If > 0, provokes an error after VM initialization; the value "   \
 925           "determines which error to provoke. See test_error_handler() "    \
 926           "in debug.cpp.")                                                  \
 927                                                                             \
 928   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 929           "If > 0, provokes an error inside VM error handler (a secondary " \
 930           "crash). see test_error_handler() in debug.cpp.")                 \
 931                                                                             \
 932   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 933           "If true, tests SafeFetch inside error handler.")                 \
 934                                                                             \
 935   develop(bool, Verbose, false,                                             \
 936           "Print additional debugging information from other modes")        \
 937                                                                             \
 938   develop(bool, PrintMiscellaneous, false,                                  \
 939           "Print uncategorized debugging information (requires +Verbose)")  \
 940                                                                             \
 941   develop(bool, WizardMode, false,                                          \
 942           "Print much more debugging information")                          \
 943                                                                             \
 944   product(bool, ShowMessageBoxOnError, false,                               \
 945           "Keep process alive on VM fatal error")                           \
 946                                                                             \
 947   product(bool, CreateCoredumpOnCrash, true,                                \
 948           "Create core/mini dump on VM fatal error")                        \
 949                                                                             \
 950   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 951           "Timeout, in seconds, to limit the time spent on writing an "     \
 952           "error log in case of a crash.")                                  \
 953           range(0, (uint64_t)max_jlong/1000)                                \
 954                                                                             \
 955   product_pd(bool, UseOSErrorReporting,                                     \
 956           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 957                                                                             \
 958   product(bool, SuppressFatalErrorMessage, false,                           \
 959           "Report NO fatal error message (avoid deadlock)")                 \
 960                                                                             \
 961   product(ccstrlist, OnError, "",                                           \
 962           "Run user-defined commands on fatal error; see VMError.cpp "      \
 963           "for examples")                                                   \
 964                                                                             \
 965   product(ccstrlist, OnOutOfMemoryError, "",                                \
 966           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 967                                                                             \
 968   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 969           "Dump heap to file before any major stop-the-world GC")           \
 970                                                                             \
 971   manageable(bool, HeapDumpAfterFullGC, false,                              \
 972           "Dump heap to file after any major stop-the-world GC")            \
 973                                                                             \
 974   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 975           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 976                                                                             \
 977   manageable(ccstr, HeapDumpPath, NULL,                                     \
 978           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 979           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 980           "in the working directory)")                                      \
 981                                                                             \
 982   develop(bool, BreakAtWarning, false,                                      \
 983           "Execute breakpoint upon encountering VM warning")                \
 984                                                                             \
 985   develop(bool, UseFakeTimers, false,                                       \
 986           "Tell whether the VM should use system time or a fake timer")     \
 987                                                                             \
 988   product(ccstr, NativeMemoryTracking, "off",                               \
 989           "Native memory tracking options")                                 \
 990                                                                             \
 991   diagnostic(bool, PrintNMTStatistics, false,                               \
 992           "Print native memory tracking summary data if it is on")          \
 993                                                                             \
 994   diagnostic(bool, LogCompilation, false,                                   \
 995           "Log compilation activity in detail to LogFile")                  \
 996                                                                             \
 997   product(bool, PrintCompilation, false,                                    \
 998           "Print compilations")                                             \
 999                                                                             \
1000   diagnostic(bool, TraceNMethodInstalls, false,                             \
1001           "Trace nmethod installation")                                     \
1002                                                                             \
1003   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1004           "0: do not allow scavengable oops in the code cache; "            \
1005           "1: allow scavenging from the code cache; "                       \
1006           "2: emit as many constants as the compiler can see")              \
1007           range(0, 2)                                                       \
1008                                                                             \
1009   product(bool, AlwaysRestoreFPU, false,                                    \
1010           "Restore the FPU control word after every JNI call (expensive)")  \
1011                                                                             \
1012   diagnostic(bool, PrintCompilation2, false,                                \
1013           "Print additional statistics per compilation")                    \
1014                                                                             \
1015   diagnostic(bool, PrintAdapterHandlers, false,                             \
1016           "Print code generated for i2c/c2i adapters")                      \
1017                                                                             \
1018   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1019           "Verify that i2c/c2i adapters are called properly")               \
1020                                                                             \
1021   develop(bool, VerifyAdapterSharing, false,                                \
1022           "Verify that the code for shared adapters is the equivalent")     \
1023                                                                             \
1024   diagnostic(bool, PrintAssembly, false,                                    \
1025           "Print assembly code (using external disassembler.so)")           \
1026                                                                             \
1027   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1028           "Print options string passed to disassembler.so")                 \
1029                                                                             \
1030   notproduct(bool, PrintNMethodStatistics, false,                           \
1031           "Print a summary statistic for the generated nmethods")           \
1032                                                                             \
1033   diagnostic(bool, PrintNMethods, false,                                    \
1034           "Print assembly code for nmethods when generated")                \
1035                                                                             \
1036   diagnostic(bool, PrintNativeNMethods, false,                              \
1037           "Print assembly code for native nmethods when generated")         \
1038                                                                             \
1039   develop(bool, PrintDebugInfo, false,                                      \
1040           "Print debug information for all nmethods when generated")        \
1041                                                                             \
1042   develop(bool, PrintRelocations, false,                                    \
1043           "Print relocation information for all nmethods when generated")   \
1044                                                                             \
1045   develop(bool, PrintDependencies, false,                                   \
1046           "Print dependency information for all nmethods when generated")   \
1047                                                                             \
1048   develop(bool, PrintExceptionHandlers, false,                              \
1049           "Print exception handler tables for all nmethods when generated") \
1050                                                                             \
1051   develop(bool, StressCompiledExceptionHandlers, false,                     \
1052           "Exercise compiled exception handlers")                           \
1053                                                                             \
1054   develop(bool, InterceptOSException, false,                                \
1055           "Start debugger when an implicit OS (e.g. NULL) "                 \
1056           "exception happens")                                              \
1057                                                                             \
1058   product(bool, PrintCodeCache, false,                                      \
1059           "Print the code cache memory usage when exiting")                 \
1060                                                                             \
1061   develop(bool, PrintCodeCache2, false,                                     \
1062           "Print detailed usage information on the code cache when exiting")\
1063                                                                             \
1064   product(bool, PrintCodeCacheOnCompilation, false,                         \
1065           "Print the code cache memory usage each time a method is "        \
1066           "compiled")                                                       \
1067                                                                             \
1068   diagnostic(bool, PrintStubCode, false,                                    \
1069           "Print generated stub code")                                      \
1070                                                                             \
1071   product(bool, StackTraceInThrowable, true,                                \
1072           "Collect backtrace in throwable when exception happens")          \
1073                                                                             \
1074   product(bool, OmitStackTraceInFastThrow, true,                            \
1075           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1076                                                                             \
1077   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1078           "Print bytecode statistics when dumping profiler output")         \
1079                                                                             \
1080   product(bool, ProfilerRecordPC, false,                                    \
1081           "Collect ticks for each 16 byte interval of compiled code")       \
1082                                                                             \
1083   product(bool, ProfileVM, false,                                           \
1084           "Profile ticks that fall within VM (either in the VM Thread "     \
1085           "or VM code called through stubs)")                               \
1086                                                                             \
1087   product(bool, ProfileIntervals, false,                                    \
1088           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1089                                                                             \
1090   notproduct(bool, ProfilerCheckIntervals, false,                           \
1091           "Collect and print information on spacing of profiler ticks")     \
1092                                                                             \
1093   product(bool, PrintWarnings, true,                                        \
1094           "Print JVM warnings to output stream")                            \
1095                                                                             \
1096   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1097           "Print warnings for stalled SpinLocks")                           \
1098                                                                             \
1099   product(bool, RegisterFinalizersAtInit, true,                             \
1100           "Register finalizable objects at end of Object.<init> or "        \
1101           "after allocation")                                               \
1102                                                                             \
1103   develop(bool, RegisterReferences, true,                                   \
1104           "Tell whether the VM should register soft/weak/final/phantom "    \
1105           "references")                                                     \
1106                                                                             \
1107   develop(bool, IgnoreRewrites, false,                                      \
1108           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1109           "This is unsafe!")                                                \
1110                                                                             \
1111   develop(bool, PrintCodeCacheExtension, false,                             \
1112           "Print extension of code cache")                                  \
1113                                                                             \
1114   develop(bool, UsePrivilegedStack, true,                                   \
1115           "Enable the security JVM functions")                              \
1116                                                                             \
1117   develop(bool, ProtectionDomainVerification, true,                         \
1118           "Verify protection domain before resolution in system dictionary")\
1119                                                                             \
1120   product(bool, ClassUnloading, true,                                       \
1121           "Do unloading of classes")                                        \
1122                                                                             \
1123   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1124           "Do unloading of classes with a concurrent marking cycle")        \
1125                                                                             \
1126   develop(bool, DisableStartThread, false,                                  \
1127           "Disable starting of additional Java threads "                    \
1128           "(for debugging only)")                                           \
1129                                                                             \
1130   develop(bool, MemProfiling, false,                                        \
1131           "Write memory usage profiling to log file")                       \
1132                                                                             \
1133   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1134           "Print the system dictionary at exit")                            \
1135                                                                             \
1136   experimental(intx, PredictedLoadedClassCount, 0,                          \
1137           "Experimental: Tune loaded class cache starting size")            \
1138                                                                             \
1139   diagnostic(bool, UnsyncloadClass, false,                                  \
1140           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1141           "class loader must call VM synchronized for findClass "           \
1142           "and defineClass.")                                               \
1143                                                                             \
1144   product(bool, AlwaysLockClassLoader, false,                               \
1145           "Require the VM to acquire the class loader lock before calling " \
1146           "loadClass() even for class loaders registering "                 \
1147           "as parallel capable")                                            \
1148                                                                             \
1149   product(bool, AllowParallelDefineClass, false,                            \
1150           "Allow parallel defineClass requests for class loaders "          \
1151           "registering as parallel capable")                                \
1152                                                                             \
1153   product(bool, MustCallLoadClassInternal, false,                           \
1154           "Call loadClassInternal() rather than loadClass()")               \
1155                                                                             \
1156   product_pd(bool, DontYieldALot,                                           \
1157           "Throw away obvious excess yield calls")                          \
1158                                                                             \
1159   product(bool, ConvertSleepToYield, true,                                  \
1160           "Convert sleep(0) to thread yield ")                              \
1161                                                                             \
1162   product(bool, ConvertYieldToSleep, false,                                 \
1163           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1164           "behavior")                                                       \
1165                                                                             \
1166   develop(bool, UseDetachedThreads, true,                                   \
1167           "Use detached threads that are recycled upon termination "        \
1168           "(for Solaris only)")                                             \
1169                                                                             \
1170   product(bool, UseLWPSynchronization, true,                                \
1171           "Use LWP-based instead of libthread-based synchronization "       \
1172           "(SPARC only)")                                                   \
1173                                                                             \
1174   experimental(ccstr, SyncKnobs, NULL,                                      \
1175                "(Unstable) Various monitor synchronization tunables")       \
1176                                                                             \
1177   experimental(intx, EmitSync, 0,                                           \
1178                "(Unsafe, Unstable) "                                        \
1179                "Control emission of inline sync fast-path code")            \
1180                                                                             \
1181   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1182           range(0, max_jint)                                                \
1183                                                                             \
1184   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1185                                                                             \
1186   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1187                "Experimental Sync flags")                                   \
1188                                                                             \
1189   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1190                                                                             \
1191   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1192                                                                             \
1193   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1194                                                                             \
1195   experimental(intx, hashCode, 5,                                           \
1196                "(Unstable) select hashCode generation algorithm")           \
1197                                                                             \
1198   product(bool, FilterSpuriousWakeups, true,                                \
1199           "When true prevents OS-level spurious, or premature, wakeups "    \
1200           "from Object.wait (Ignored for Windows)")                         \
1201                                                                             \
1202   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1203                                                                             \
1204   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1205                                                                             \
1206   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1207                                                                             \
1208   develop(bool, UsePthreads, false,                                         \
1209           "Use pthread-based instead of libthread-based synchronization "   \
1210           "(SPARC only)")                                                   \
1211                                                                             \
1212   product(bool, ReduceSignalUsage, false,                                   \
1213           "Reduce the use of OS signals in Java and/or the VM")             \
1214                                                                             \
1215   develop_pd(bool, ShareVtableStubs,                                        \
1216           "Share vtable stubs (smaller code but worse branch prediction")   \
1217                                                                             \
1218   develop(bool, LoadLineNumberTables, true,                                 \
1219           "Tell whether the class file parser loads line number tables")    \
1220                                                                             \
1221   develop(bool, LoadLocalVariableTables, true,                              \
1222           "Tell whether the class file parser loads local variable tables") \
1223                                                                             \
1224   develop(bool, LoadLocalVariableTypeTables, true,                          \
1225           "Tell whether the class file parser loads local variable type"    \
1226           "tables")                                                         \
1227                                                                             \
1228   product(bool, AllowUserSignalHandlers, false,                             \
1229           "Do not complain if the application installs signal handlers "    \
1230           "(Solaris & Linux only)")                                         \
1231                                                                             \
1232   product(bool, UseSignalChaining, true,                                    \
1233           "Use signal-chaining to invoke signal handlers installed "        \
1234           "by the application (Solaris & Linux only)")                      \
1235                                                                             \
1236   product(bool, AllowJNIEnvProxy, false,                                    \
1237           "Allow JNIEnv proxies for jdbx")                                  \
1238                                                                             \
1239   product(bool, RestoreMXCSROnJNICalls, false,                              \
1240           "Restore MXCSR when returning from JNI calls")                    \
1241                                                                             \
1242   product(bool, CheckJNICalls, false,                                       \
1243           "Verify all arguments to JNI calls")                              \
1244                                                                             \
1245   product(bool, CheckEndorsedAndExtDirs, false,                             \
1246           "Verify the endorsed and extension directories are not used")     \
1247                                                                             \
1248   product(bool, UseFastJNIAccessors, true,                                  \
1249           "Use optimized versions of Get<Primitive>Field")                  \
1250                                                                             \
1251   product(intx, MaxJNILocalCapacity, 65536,                                 \
1252           "Maximum allowable local JNI handle capacity to "                 \
1253           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1254           "where <= 0 is unlimited, default: 65536")                        \
1255           range(min_intx, max_intx)                                         \
1256                                                                             \
1257   product(bool, EagerXrunInit, false,                                       \
1258           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1259           "but not all -Xrun libraries may support the state of the VM "    \
1260           "at this time")                                                   \
1261                                                                             \
1262   product(bool, PreserveAllAnnotations, false,                              \
1263           "Preserve RuntimeInvisibleAnnotations as well "                   \
1264           "as RuntimeVisibleAnnotations")                                   \
1265                                                                             \
1266   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1267           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1268                                                                             \
1269   product(bool, UseXMMForArrayCopy, false,                                  \
1270           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1271                                                                             \
1272   product(intx, FieldsAllocationStyle, 1,                                   \
1273           "0 - type based with oops first, "                                \
1274           "1 - with oops last, "                                            \
1275           "2 - oops in super and sub classes are together")                 \
1276           range(0, 2)                                                       \
1277                                                                             \
1278   product(bool, CompactFields, true,                                        \
1279           "Allocate nonstatic fields in gaps between previous fields")      \
1280                                                                             \
1281   notproduct(bool, PrintFieldLayout, false,                                 \
1282           "Print field layout for each class")                              \
1283                                                                             \
1284   /* Need to limit the extent of the padding to reasonable size.          */\
1285   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1286   /* aggressive prefetching, while still leaving the room for segregating */\
1287   /* among the distinct pages.                                            */\
1288   product(intx, ContendedPaddingWidth, 128,                                 \
1289           "How many bytes to pad the fields/classes marked @Contended with")\
1290           range(0, 8192)                                                    \
1291           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1292                                                                             \
1293   product(bool, EnableContended, true,                                      \
1294           "Enable @Contended annotation support")                           \
1295                                                                             \
1296   product(bool, RestrictContended, true,                                    \
1297           "Restrict @Contended to trusted classes")                         \
1298                                                                             \
1299   product(bool, UseBiasedLocking, true,                                     \
1300           "Enable biased locking in JVM")                                   \
1301                                                                             \
1302   product(intx, BiasedLockingStartupDelay, 4000,                            \
1303           "Number of milliseconds to wait before enabling biased locking")  \
1304           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1305           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1306                                                                             \
1307   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1308           "Print statistics of biased locking in JVM")                      \
1309                                                                             \
1310   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1311           "Threshold of number of revocations per type to try to "          \
1312           "rebias all objects in the heap of that type")                    \
1313           range(0, max_intx)                                                \
1314           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1315                                                                             \
1316   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1317           "Threshold of number of revocations per type to permanently "     \
1318           "revoke biases of all objects in the heap of that type")          \
1319           range(0, max_intx)                                                \
1320           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1321                                                                             \
1322   product(intx, BiasedLockingDecayTime, 25000,                              \
1323           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1324           "type after previous bulk rebias")                                \
1325           range(500, max_intx)                                              \
1326           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1327                                                                             \
1328   product(bool, ExitOnOutOfMemoryError, false,                              \
1329           "JVM exits on the first occurrence of an out-of-memory error")    \
1330                                                                             \
1331   product(bool, CrashOnOutOfMemoryError, false,                             \
1332           "JVM aborts, producing an error log and core/mini dump, on the "  \
1333           "first occurrence of an out-of-memory error")                     \
1334                                                                             \
1335   /* tracing */                                                             \
1336                                                                             \
1337   develop(bool, StressRewriter, false,                                      \
1338           "Stress linktime bytecode rewriting")                             \
1339                                                                             \
1340   product(ccstr, TraceJVMTI, NULL,                                          \
1341           "Trace flags for JVMTI functions and events")                     \
1342                                                                             \
1343   /* This option can change an EMCP method into an obsolete method. */      \
1344   /* This can affect tests that except specific methods to be EMCP. */      \
1345   /* This option should be used with caution.                       */      \
1346   product(bool, StressLdcRewrite, false,                                    \
1347           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1348                                                                             \
1349   /* change to false by default sometime after Mustang */                   \
1350   product(bool, VerifyMergedCPBytecodes, true,                              \
1351           "Verify bytecodes after RedefineClasses constant pool merging")   \
1352                                                                             \
1353   develop(bool, TraceBytecodes, false,                                      \
1354           "Trace bytecode execution")                                       \
1355                                                                             \
1356   develop(bool, TraceICs, false,                                            \
1357           "Trace inline cache changes")                                     \
1358                                                                             \
1359   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1360           "Trace method invocation counter overflow")                       \
1361                                                                             \
1362   develop(bool, TraceInlineCacheClearing, false,                            \
1363           "Trace clearing of inline caches in nmethods")                    \
1364                                                                             \
1365   develop(bool, TraceDependencies, false,                                   \
1366           "Trace dependencies")                                             \
1367                                                                             \
1368   develop(bool, VerifyDependencies, trueInDebug,                            \
1369           "Exercise and verify the compilation dependency mechanism")       \
1370                                                                             \
1371   develop(bool, TraceNewOopMapGeneration, false,                            \
1372           "Trace OopMapGeneration")                                         \
1373                                                                             \
1374   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1375           "Trace OopMapGeneration: print detailed cell states")             \
1376                                                                             \
1377   develop(bool, TimeOopMap, false,                                          \
1378           "Time calls to GenerateOopMap::compute_map() in sum")             \
1379                                                                             \
1380   develop(bool, TimeOopMap2, false,                                         \
1381           "Time calls to GenerateOopMap::compute_map() individually")       \
1382                                                                             \
1383   develop(bool, TraceOopMapRewrites, false,                                 \
1384           "Trace rewriting of method oops during oop map generation")       \
1385                                                                             \
1386   develop(bool, TraceICBuffer, false,                                       \
1387           "Trace usage of IC buffer")                                       \
1388                                                                             \
1389   develop(bool, TraceCompiledIC, false,                                     \
1390           "Trace changes of compiled IC")                                   \
1391                                                                             \
1392   /* gc */                                                                  \
1393                                                                             \
1394   product(bool, UseSerialGC, false,                                         \
1395           "Use the Serial garbage collector")                               \
1396                                                                             \
1397   product(bool, UseG1GC, false,                                             \
1398           "Use the Garbage-First garbage collector")                        \
1399                                                                             \
1400   product(bool, UseParallelGC, false,                                       \
1401           "Use the Parallel Scavenge garbage collector")                    \
1402                                                                             \
1403   product(bool, UseParallelOldGC, false,                                    \
1404           "Use the Parallel Old garbage collector")                         \
1405                                                                             \
1406   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1407           "How often should we maximally compact the heap (not allowing "   \
1408           "any dead space)")                                                \
1409           range(0, max_uintx)                                               \
1410                                                                             \
1411   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1412           "The collection count for the first maximum compaction")          \
1413           range(0, max_uintx)                                               \
1414                                                                             \
1415   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1416           "Use maximum compaction in the Parallel Old garbage collector "   \
1417           "for a system GC")                                                \
1418                                                                             \
1419   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1420           "The mean used by the parallel compact dead wood "                \
1421           "limiter (a number between 0-100)")                               \
1422           range(0, 100)                                                     \
1423                                                                             \
1424   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1425           "The standard deviation used by the parallel compact dead wood "  \
1426           "limiter (a number between 0-100)")                               \
1427           range(0, 100)                                                     \
1428                                                                             \
1429   product(uint, ParallelGCThreads, 0,                                       \
1430           "Number of parallel threads parallel gc will use")                \
1431           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1432                                                                             \
1433   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1434             "Use semaphore synchronization for the GC Threads, "            \
1435             "instead of synchronization based on mutexes")                  \
1436                                                                             \
1437   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1438           "Dynamically choose the number of parallel threads "              \
1439           "parallel gc will use")                                           \
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(uintx, GCTaskTimeStampEntries, 200,                               \
1459           "Number of time stamp entries per gc worker thread")              \
1460           range(1, max_uintx)                                               \
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, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1480           "A System.gc() request invokes a concurrent collection and "      \
1481           "also unloads classes during such a concurrent gc cycle "         \
1482           "(effective only when UseConcMarkSweepGC)")                       \
1483                                                                             \
1484   product(bool, GCLockerInvokesConcurrent, false,                           \
1485           "The exit of a JNI critical section necessitating a scavenge, "   \
1486           "also kicks off a background concurrent collection")              \
1487                                                                             \
1488   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1489           "How much the GC can expand the eden by while the GC locker "     \
1490           "is active (as a percentage)")                                    \
1491           range(0, 100)                                                     \
1492                                                                             \
1493   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1494           "Number of times to retry allocations when "                      \
1495           "blocked by the GC locker")                                       \
1496           range(0, max_uintx)                                               \
1497                                                                             \
1498   product(bool, UseCMSBestFit, true,                                        \
1499           "Use CMS best fit allocation strategy")                           \
1500                                                                             \
1501   product(bool, UseParNewGC, false,                                         \
1502           "Use parallel threads in the new generation")                     \
1503                                                                             \
1504   product(uintx, ParallelGCBufferWastePct, 10,                              \
1505           "Wasted fraction of parallel allocation buffer")                  \
1506           range(0, 100)                                                     \
1507                                                                             \
1508   product(uintx, TargetPLABWastePct, 10,                                    \
1509           "Target wasted space in last buffer as percent of overall "       \
1510           "allocation")                                                     \
1511           range(1, 100)                                                     \
1512                                                                             \
1513   product(uintx, PLABWeight, 75,                                            \
1514           "Percentage (0-100) used to weight the current sample when "      \
1515           "computing exponentially decaying average for ResizePLAB")        \
1516           range(0, 100)                                                     \
1517                                                                             \
1518   product(bool, ResizePLAB, true,                                           \
1519           "Dynamically resize (survivor space) promotion LAB's")            \
1520                                                                             \
1521   product(int, ParGCArrayScanChunk, 50,                                     \
1522           "Scan a subset of object array and push remainder, if array is "  \
1523           "bigger than this")                                               \
1524           range(1, max_jint/3)                                              \
1525                                                                             \
1526   product(bool, ParGCUseLocalOverflow, false,                               \
1527           "Instead of a global overflow list, use local overflow stacks")   \
1528                                                                             \
1529   product(bool, ParGCTrimOverflow, true,                                    \
1530           "Eagerly trim the local overflow lists "                          \
1531           "(when ParGCUseLocalOverflow)")                                   \
1532                                                                             \
1533   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1534           "Simulate work queue overflow in ParNew")                         \
1535                                                                             \
1536   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1537           "An `interval' counter that determines how frequently "           \
1538           "we simulate overflow; a smaller number increases frequency")     \
1539                                                                             \
1540   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1541           "The desired number of objects to claim from the overflow list")  \
1542           range(0, max_uintx)                                               \
1543                                                                             \
1544   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1545           "The number of strides per worker thread that we divide up the "  \
1546           "card table scanning work into")                                  \
1547           range(1, max_uintx)                                               \
1548           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1549                                                                             \
1550   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1551           "The number of cards in each chunk of the parallel chunks used "  \
1552           "during card table scanning")                                     \
1553           range(1, max_intx)                                                \
1554           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1555                                                                             \
1556   product(uintx, OldPLABWeight, 50,                                         \
1557           "Percentage (0-100) used to weight the current sample when "      \
1558           "computing exponentially decaying average for resizing "          \
1559           "OldPLABSize")                                                    \
1560           range(0, 100)                                                     \
1561                                                                             \
1562   product(bool, ResizeOldPLAB, true,                                        \
1563           "Dynamically resize (old gen) promotion LAB's")                   \
1564                                                                             \
1565   product(size_t, CMSOldPLABMax, 1024,                                      \
1566           "Maximum size of CMS gen promotion LAB caches per worker "        \
1567           "per block size")                                                 \
1568           range(1, max_uintx)                                               \
1569           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1570                                                                             \
1571   product(size_t, CMSOldPLABMin, 16,                                        \
1572           "Minimum size of CMS gen promotion LAB caches per worker "        \
1573           "per block size")                                                 \
1574           range(1, max_uintx)                                               \
1575           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1576                                                                             \
1577   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1578           "Nominal number of refills of CMS gen promotion LAB cache "       \
1579           "per worker per block size")                                      \
1580           range(1, max_uintx)                                               \
1581                                                                             \
1582   product(bool, CMSOldPLABResizeQuicker, false,                             \
1583           "React on-the-fly during a scavenge to a sudden "                 \
1584           "change in block demand rate")                                    \
1585                                                                             \
1586   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1587           "The tolerance of the phase-change detector for on-the-fly "      \
1588           "PLAB resizing during a scavenge")                                \
1589           range(1, max_uintx)                                               \
1590                                                                             \
1591   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1592           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1593           "during a scavenge")                                              \
1594           range(1, max_uintx)                                               \
1595                                                                             \
1596   product(bool, AlwaysPreTouch, false,                                      \
1597           "Force all freshly committed pages to be pre-touched")            \
1598                                                                             \
1599   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1600           "The maximum size of young gen chosen by default per GC worker "  \
1601           "thread available")                                               \
1602           range(1, max_uintx)                                               \
1603                                                                             \
1604   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1605           "Percentage (0-100) used to add conservatism when computing the " \
1606           "duty cycle")                                                     \
1607           range(0, 100)                                                     \
1608                                                                             \
1609   product(uintx, CMSExpAvgFactor, 50,                                       \
1610           "Percentage (0-100) used to weight the current sample when "      \
1611           "computing exponential averages for CMS statistics")              \
1612           range(0, 100)                                                     \
1613                                                                             \
1614   product(uintx, CMS_FLSWeight, 75,                                         \
1615           "Percentage (0-100) used to weight the current sample when "      \
1616           "computing exponentially decaying averages for CMS FLS "          \
1617           "statistics")                                                     \
1618           range(0, 100)                                                     \
1619                                                                             \
1620   product(uintx, CMS_FLSPadding, 1,                                         \
1621           "The multiple of deviation from mean to use for buffering "       \
1622           "against volatility in free list demand")                         \
1623           range(0, max_juint)                                               \
1624                                                                             \
1625   product(uintx, FLSCoalescePolicy, 2,                                      \
1626           "CMS: aggressiveness level for coalescing, increasing "           \
1627           "from 0 to 4")                                                    \
1628           range(0, 4)                                                       \
1629                                                                             \
1630   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1631           "CMS: larger free blocks are always available for coalescing")    \
1632                                                                             \
1633   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1634           "CMS: the smaller the percentage the greater the coalescing "     \
1635           "force")                                                          \
1636           range(0.0, 1.0)                                                   \
1637                                                                             \
1638   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1639           "CMS: the factor by which to inflate estimated demand of small "  \
1640           "block sizes to prevent coalescing with an adjoining block")      \
1641           range(0.0, DBL_MAX)                                               \
1642                                                                             \
1643   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1644           "CMS: the factor by which to inflate estimated demand of large "  \
1645           "block sizes to prevent coalescing with an adjoining block")      \
1646           range(0.0, DBL_MAX)                                               \
1647                                                                             \
1648   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1649           "CMS: the factor by which to inflate estimated demand of small "  \
1650           "block sizes to prevent splitting to supply demand for smaller "  \
1651           "blocks")                                                         \
1652           range(0.0, DBL_MAX)                                               \
1653                                                                             \
1654   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1655           "CMS: the factor by which to inflate estimated demand of large "  \
1656           "block sizes to prevent splitting to supply demand for smaller "  \
1657           "blocks")                                                         \
1658           range(0.0, DBL_MAX)                                               \
1659                                                                             \
1660   product(bool, CMSExtrapolateSweep, false,                                 \
1661           "CMS: cushion for block demand during sweep")                     \
1662                                                                             \
1663   product(uintx, CMS_SweepWeight, 75,                                       \
1664           "Percentage (0-100) used to weight the current sample when "      \
1665           "computing exponentially decaying average for inter-sweep "       \
1666           "duration")                                                       \
1667           range(0, 100)                                                     \
1668                                                                             \
1669   product(uintx, CMS_SweepPadding, 1,                                       \
1670           "The multiple of deviation from mean to use for buffering "       \
1671           "against volatility in inter-sweep duration")                     \
1672           range(0, max_juint)                                               \
1673                                                                             \
1674   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1675           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1676           "duration exceeds this threshold in milliseconds")                \
1677           range(0, max_uintx)                                               \
1678                                                                             \
1679   product(bool, CMSClassUnloadingEnabled, true,                             \
1680           "Whether class unloading enabled when using CMS GC")              \
1681                                                                             \
1682   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1683           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1684           "count for which classes may not be unloaded")                    \
1685           range(0, max_uintx)                                               \
1686                                                                             \
1687   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1688           "Replenish an indexed free list with this number of chunks")      \
1689           range(1, max_uintx)                                               \
1690                                                                             \
1691   product(bool, CMSReplenishIntermediate, true,                             \
1692           "Replenish all intermediate free-list caches")                    \
1693                                                                             \
1694   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1695           "When satisfying batched demand, split blocks from the "          \
1696           "IndexedFreeList whose size is a multiple of requested size")     \
1697                                                                             \
1698   product(bool, CMSLoopWarn, false,                                         \
1699           "Warn in case of excessive CMS looping")                          \
1700                                                                             \
1701   /* where does the range max value of (max_jint - 1) come from? */         \
1702   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1703           "Maximum size of marking stack")                                  \
1704           range(1, (max_jint - 1))                                          \
1705                                                                             \
1706   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1707           "Size of marking stack")                                          \
1708           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1709                                                                             \
1710   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1711           "Simulate frequent marking stack / work queue overflow")          \
1712                                                                             \
1713   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1714           "An \"interval\" counter that determines how frequently "         \
1715           "to simulate overflow; a smaller number increases frequency")     \
1716                                                                             \
1717   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1718           "Maximum number of abortable preclean iterations, if > 0")        \
1719           range(0, max_uintx)                                               \
1720                                                                             \
1721   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1722           "Maximum time in abortable preclean (in milliseconds)")           \
1723           range(0, max_intx)                                                \
1724                                                                             \
1725   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1726           "Nominal minimum work per abortable preclean iteration")          \
1727           range(0, max_uintx)                                               \
1728                                                                             \
1729   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1730           "Time that we sleep between iterations when not given "           \
1731           "enough work per iteration")                                      \
1732           range(0, max_intx)                                                \
1733                                                                             \
1734   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1735   product(size_t, CMSRescanMultiple, 32,                                    \
1736           "Size (in cards) of CMS parallel rescan task")                    \
1737           range(1, SIZE_MAX / 4096)                                         \
1738           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1739                                                                             \
1740   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1741   product(size_t, CMSConcMarkMultiple, 32,                                  \
1742           "Size (in cards) of CMS concurrent MT marking task")              \
1743           range(1, SIZE_MAX / 4096)                                         \
1744           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1745                                                                             \
1746   product(bool, CMSAbortSemantics, false,                                   \
1747           "Whether abort-on-overflow semantics is implemented")             \
1748                                                                             \
1749   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1750           "Use the parallel initial mark.")                                 \
1751                                                                             \
1752   product(bool, CMSParallelRemarkEnabled, true,                             \
1753           "Whether parallel remark enabled (only if ParNewGC)")             \
1754                                                                             \
1755   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1756           "Whether parallel remark of survivor space "                      \
1757           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1758                                                                             \
1759   product(bool, CMSPLABRecordAlways, true,                                  \
1760           "Always record survivor space PLAB boundaries (effective only "   \
1761           "if CMSParallelSurvivorRemarkEnabled)")                           \
1762                                                                             \
1763   product(bool, CMSEdenChunksRecordAlways, true,                            \
1764           "Always record eden chunks used for the parallel initial mark "   \
1765           "or remark of eden")                                              \
1766                                                                             \
1767   product(bool, CMSConcurrentMTEnabled, true,                               \
1768           "Whether multi-threaded concurrent work enabled "                 \
1769           "(effective only if ParNewGC)")                                   \
1770                                                                             \
1771   product(bool, CMSPrecleaningEnabled, true,                                \
1772           "Whether concurrent precleaning enabled")                         \
1773                                                                             \
1774   product(uintx, CMSPrecleanIter, 3,                                        \
1775           "Maximum number of precleaning iteration passes")                 \
1776           range(0, 9)                                                       \
1777                                                                             \
1778   product(uintx, CMSPrecleanDenominator, 3,                                 \
1779           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1780           "ratio")                                                          \
1781           range(1, max_uintx)                                               \
1782           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1783                                                                             \
1784   product(uintx, CMSPrecleanNumerator, 2,                                   \
1785           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1786           "ratio")                                                          \
1787           range(0, max_uintx-1)                                             \
1788           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1789                                                                             \
1790   product(bool, CMSPrecleanRefLists1, true,                                 \
1791           "Preclean ref lists during (initial) preclean phase")             \
1792                                                                             \
1793   product(bool, CMSPrecleanRefLists2, false,                                \
1794           "Preclean ref lists during abortable preclean phase")             \
1795                                                                             \
1796   product(bool, CMSPrecleanSurvivors1, false,                               \
1797           "Preclean survivors during (initial) preclean phase")             \
1798                                                                             \
1799   product(bool, CMSPrecleanSurvivors2, true,                                \
1800           "Preclean survivors during abortable preclean phase")             \
1801                                                                             \
1802   product(uintx, CMSPrecleanThreshold, 1000,                                \
1803           "Do not iterate again if number of dirty cards is less than this")\
1804           range(100, max_uintx)                                             \
1805                                                                             \
1806   product(bool, CMSCleanOnEnter, true,                                      \
1807           "Clean-on-enter optimization for reducing number of dirty cards") \
1808                                                                             \
1809   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1810           "Choose variant (1,2) of verification following remark")          \
1811           range(1, 2)                                                       \
1812                                                                             \
1813   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1814           "If Eden size is below this, do not try to schedule remark")      \
1815           range(0, max_uintx)                                               \
1816                                                                             \
1817   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1818           "The Eden occupancy percentage (0-100) at which "                 \
1819           "to try and schedule remark pause")                               \
1820           range(0, 100)                                                     \
1821                                                                             \
1822   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1823           "Start sampling eden top at least before young gen "              \
1824           "occupancy reaches 1/<ratio> of the size at which "               \
1825           "we plan to schedule remark")                                     \
1826           range(1, max_uintx)                                               \
1827                                                                             \
1828   product(uintx, CMSSamplingGrain, 16*K,                                    \
1829           "The minimum distance between eden samples for CMS (see above)")  \
1830           range(ObjectAlignmentInBytes, max_uintx)                          \
1831           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1832                                                                             \
1833   product(bool, CMSScavengeBeforeRemark, false,                             \
1834           "Attempt scavenge before the CMS remark step")                    \
1835                                                                             \
1836   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1837           "Don't drain below this size per parallel worker/thief")          \
1838           range(1, max_juint)                                               \
1839           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1840                                                                             \
1841   manageable(intx, CMSWaitDuration, 2000,                                   \
1842           "Time in milliseconds that CMS thread waits for young GC")        \
1843           range(min_jint, max_jint)                                         \
1844                                                                             \
1845   develop(uintx, CMSCheckInterval, 1000,                                    \
1846           "Interval in milliseconds that CMS thread checks if it "          \
1847           "should start a collection cycle")                                \
1848                                                                             \
1849   product(bool, CMSYield, true,                                             \
1850           "Yield between steps of CMS")                                     \
1851                                                                             \
1852   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1853           "Bitmap operations should process at most this many bits "        \
1854           "between yields")                                                 \
1855           range(1, max_uintx)                                               \
1856           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1857                                                                             \
1858   product(bool, CMSPrintChunksInDump, false,                                \
1859           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1860           "trace level include more detailed information about the"         \
1861           "free chunks")                \
1862                                                                             \
1863   product(bool, CMSPrintObjectsInDump, false,                               \
1864           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1865           "trace level include more detailed information about the"         \
1866           "allocated objects")                                              \
1867                                                                             \
1868   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1869           "Verify that all references across the FLS boundary "             \
1870           "are to valid objects")                                           \
1871                                                                             \
1872   diagnostic(bool, FLSVerifyLists, false,                                   \
1873           "Do lots of (expensive) FreeListSpace verification")              \
1874                                                                             \
1875   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1876           "Do lots of (expensive) FLS index table verification")            \
1877                                                                             \
1878   develop(bool, FLSVerifyDictionary, false,                                 \
1879           "Do lots of (expensive) FLS dictionary verification")             \
1880                                                                             \
1881   develop(bool, VerifyBlockOffsetArray, false,                              \
1882           "Do (expensive) block offset array verification")                 \
1883                                                                             \
1884   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1885           "Maintain _unallocated_block in BlockOffsetArray "                \
1886           "(currently applicable only to CMS collector)")                   \
1887                                                                             \
1888   product(intx, RefDiscoveryPolicy, 0,                                      \
1889           "Select type of reference discovery policy: "                     \
1890           "reference-based(0) or referent-based(1)")                        \
1891           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1892                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1893                                                                             \
1894   product(bool, ParallelRefProcEnabled, false,                              \
1895           "Enable parallel reference processing whenever possible")         \
1896                                                                             \
1897   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1898           "Enable balancing of reference processing queues")                \
1899                                                                             \
1900   product(uintx, CMSTriggerRatio, 80,                                       \
1901           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1902           "allocated before a CMS collection cycle commences")              \
1903           range(0, 100)                                                     \
1904                                                                             \
1905   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1906           "Percentage CMS generation occupancy at which to "                \
1907           "initiate CMS collection for bootstrapping collection stats")     \
1908           range(0, 100)                                                     \
1909                                                                             \
1910   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1911           "Percentage CMS generation occupancy to start a CMS collection "  \
1912           "cycle. A negative value means that CMSTriggerRatio is used")     \
1913           range(min_intx, 100)                                              \
1914                                                                             \
1915   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1916           "The percent occupancy (IHOP) of the current old generation "     \
1917           "capacity above which a concurrent mark cycle will be initiated " \
1918           "Its value may change over time if adaptive IHOP is enabled, "    \
1919           "otherwise the value remains constant. "                          \
1920           "In the latter case a value of 0 will result as frequent as "     \
1921           "possible concurrent marking cycles. A value of 100 disables "    \
1922           "concurrent marking. "                                            \
1923           "Fragmentation waste in the old generation is not considered "    \
1924           "free space in this calculation. (G1 collector only)")            \
1925           range(0, 100)                                                     \
1926                                                                             \
1927   manageable(intx, CMSTriggerInterval, -1,                                  \
1928           "Commence a CMS collection cycle (at least) every so many "       \
1929           "milliseconds (0 permanently, -1 disabled)")                      \
1930           range(-1, max_intx)                                               \
1931                                                                             \
1932   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1933           "Only use occupancy as a criterion for starting a CMS collection")\
1934                                                                             \
1935   product(uintx, CMSIsTooFullPercentage, 98,                                \
1936           "An absolute ceiling above which CMS will always consider the "   \
1937           "unloading of classes when class unloading is enabled")           \
1938           range(0, 100)                                                     \
1939                                                                             \
1940   develop(bool, CMSTestInFreeList, false,                                   \
1941           "Check if the coalesced range is already in the "                 \
1942           "free lists as claimed")                                          \
1943                                                                             \
1944   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1945           "Check that all the garbage collected was returned to the "       \
1946           "free lists")                                                     \
1947                                                                             \
1948   notproduct(bool, ScavengeALot, false,                                     \
1949           "Force scavenge at every Nth exit from the runtime system "       \
1950           "(N=ScavengeALotInterval)")                                       \
1951                                                                             \
1952   develop(bool, FullGCALot, false,                                          \
1953           "Force full gc at every Nth exit from the runtime system "        \
1954           "(N=FullGCALotInterval)")                                         \
1955                                                                             \
1956   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1957           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1958                                                                             \
1959   notproduct(bool, PromotionFailureALot, false,                             \
1960           "Use promotion failure handling on every youngest generation "    \
1961           "collection")                                                     \
1962                                                                             \
1963   develop(uintx, PromotionFailureALotCount, 1000,                           \
1964           "Number of promotion failures occurring at PLAB "                 \
1965           "refill attempts (ParNew) or promotion attempts "                 \
1966           "(other young collectors)")                                       \
1967                                                                             \
1968   develop(uintx, PromotionFailureALotInterval, 5,                           \
1969           "Total collections between promotion failures a lot")             \
1970                                                                             \
1971   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1972           "Sleep time when sleep is used for yields")                       \
1973                                                                             \
1974   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1975           "Number of yields before a sleep is done during work stealing")   \
1976                                                                             \
1977   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1978           "Number of iterations in a spin loop between checks on "          \
1979           "time out of hard spin")                                          \
1980                                                                             \
1981   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1982           "Ratio of hard spins to calls to yield")                          \
1983                                                                             \
1984   develop(uintx, ObjArrayMarkingStride, 512,                                \
1985           "Number of object array elements to push onto the marking stack " \
1986           "before pushing a continuation entry")                            \
1987                                                                             \
1988   develop(bool, MetadataAllocationFailALot, false,                          \
1989           "Fail metadata allocations at intervals controlled by "           \
1990           "MetadataAllocationFailALotInterval")                             \
1991                                                                             \
1992   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1993           "Metadata allocation failure a lot interval")                     \
1994                                                                             \
1995   notproduct(bool, ExecuteInternalVMTests, false,                           \
1996           "Enable execution of internal VM tests")                          \
1997                                                                             \
1998   notproduct(bool, VerboseInternalVMTests, false,                           \
1999           "Turn on logging for internal VM tests.")                         \
2000                                                                             \
2001   product(bool, ExecutingUnitTests, false,                                  \
2002           "Whether the JVM is running unit tests or not")                   \
2003                                                                             \
2004   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2005                                                                             \
2006   product_pd(bool, ResizeTLAB,                                              \
2007           "Dynamically resize TLAB size for threads")                       \
2008                                                                             \
2009   product(bool, ZeroTLAB, false,                                            \
2010           "Zero out the newly created TLAB")                                \
2011                                                                             \
2012   product(bool, FastTLABRefill, true,                                       \
2013           "Use fast TLAB refill code")                                      \
2014                                                                             \
2015   product(bool, TLABStats, true,                                            \
2016           "Provide more detailed and expensive TLAB statistics.")           \
2017                                                                             \
2018   product_pd(bool, NeverActAsServerClassMachine,                            \
2019           "Never act like a server-class machine")                          \
2020                                                                             \
2021   product(bool, AlwaysActAsServerClassMachine, false,                       \
2022           "Always act like a server-class machine")                         \
2023                                                                             \
2024   product_pd(uint64_t, MaxRAM,                                              \
2025           "Real memory size (in bytes) used to set maximum heap size")      \
2026           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2027                                                                             \
2028   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2029           "Maximum ergonomically set heap size (in bytes); zero means use " \
2030           "MaxRAM / MaxRAMFraction")                                        \
2031           range(0, max_uintx)                                               \
2032                                                                             \
2033   product(uintx, MaxRAMFraction, 4,                                         \
2034           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2035           "size")                                                           \
2036           range(1, max_uintx)                                               \
2037                                                                             \
2038   product(uintx, MinRAMFraction, 2,                                         \
2039           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2040           "size on systems with small physical memory size")                \
2041           range(1, max_uintx)                                               \
2042                                                                             \
2043   product(uintx, InitialRAMFraction, 64,                                    \
2044           "Fraction (1/n) of real memory used for initial heap size")       \
2045           range(1, max_uintx)                                               \
2046                                                                             \
2047   develop(uintx, MaxVirtMemFraction, 2,                                     \
2048           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2049           "determining maximum heap size")                                  \
2050                                                                             \
2051   product(bool, UseAutoGCSelectPolicy, false,                               \
2052           "Use automatic collection selection policy")                      \
2053                                                                             \
2054   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2055           "Automatic GC selection pause threshold in milliseconds")         \
2056           range(0, max_uintx)                                               \
2057                                                                             \
2058   product(bool, UseAdaptiveSizePolicy, true,                                \
2059           "Use adaptive generation sizing policies")                        \
2060                                                                             \
2061   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2062           "Use adaptive survivor sizing policies")                          \
2063                                                                             \
2064   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2065           "Use adaptive young-old sizing policies at minor collections")    \
2066                                                                             \
2067   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2068           "Use adaptive young-old sizing policies at major collections")    \
2069                                                                             \
2070   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2071           "Include statistics from System.gc() for adaptive size policy")   \
2072                                                                             \
2073   product(bool, UseAdaptiveGCBoundary, false,                               \
2074           "Allow young-old boundary to move")                               \
2075                                                                             \
2076   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2077           "Resize the virtual spaces of the young or old generations")      \
2078           range(-1, 1)                                                      \
2079                                                                             \
2080   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2081           "Policy for changing generation size for throughput goals")       \
2082           range(0, 1)                                                       \
2083                                                                             \
2084   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2085           "Number of steps where heuristics is used before data is used")   \
2086           range(0, max_uintx)                                               \
2087                                                                             \
2088   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2089           "Number of collections before the adaptive sizing is started")    \
2090                                                                             \
2091   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2092           "Collection interval for printing information; zero means never") \
2093           range(0, max_uintx)                                               \
2094                                                                             \
2095   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2096           "Use adaptive minimum footprint as a goal")                       \
2097                                                                             \
2098   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2099           "Weight given to exponential resizing, between 0 and 100")        \
2100           range(0, 100)                                                     \
2101                                                                             \
2102   product(uintx, AdaptiveTimeWeight,       25,                              \
2103           "Weight given to time in adaptive policy, between 0 and 100")     \
2104           range(0, 100)                                                     \
2105                                                                             \
2106   product(uintx, PausePadding, 1,                                           \
2107           "How much buffer to keep for pause time")                         \
2108           range(0, max_juint)                                               \
2109                                                                             \
2110   product(uintx, PromotedPadding, 3,                                        \
2111           "How much buffer to keep for promotion failure")                  \
2112           range(0, max_juint)                                               \
2113                                                                             \
2114   product(uintx, SurvivorPadding, 3,                                        \
2115           "How much buffer to keep for survivor overflow")                  \
2116           range(0, max_juint)                                               \
2117                                                                             \
2118   product(uintx, ThresholdTolerance, 10,                                    \
2119           "Allowed collection cost difference between generations")         \
2120           range(0, 100)                                                     \
2121                                                                             \
2122   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2123           "If collection costs are within margin, reduce both by full "     \
2124           "delta")                                                          \
2125           range(0, 100)                                                     \
2126                                                                             \
2127   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2128           "Adaptive size percentage change in young generation")            \
2129           range(0, 100)                                                     \
2130                                                                             \
2131   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2132           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2133           range(0, 100)                                                     \
2134                                                                             \
2135   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2136           "Decay factor to YoungedGenerationSizeSupplement")                \
2137           range(1, max_uintx)                                               \
2138                                                                             \
2139   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2140           "Adaptive size percentage change in tenured generation")          \
2141           range(0, 100)                                                     \
2142                                                                             \
2143   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2144           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2145           range(0, 100)                                                     \
2146                                                                             \
2147   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2148           "Decay factor to TenuredGenerationSizeIncrement")                 \
2149           range(1, max_uintx)                                               \
2150                                                                             \
2151   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2152           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2153           "or (G1 Only) the maximum GC time per MMU time slice")            \
2154           range(1, max_uintx - 1)                                           \
2155           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2156                                                                             \
2157   product(uintx, GCPauseIntervalMillis, 0,                                  \
2158           "Time slice for MMU specification")                               \
2159           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2160                                                                             \
2161   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2162           "Adaptive size policy maximum GC minor pause time goal "          \
2163           "in millisecond")                                                 \
2164           range(0, max_uintx)                                               \
2165                                                                             \
2166   product(uintx, GCTimeRatio, 99,                                           \
2167           "Adaptive size policy application time to GC time ratio")         \
2168           range(0, max_juint)                                               \
2169                                                                             \
2170   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2171           "Adaptive size scale down factor for shrinking")                  \
2172           range(1, max_uintx)                                               \
2173                                                                             \
2174   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2175           "Adaptive size decays the major cost for long major intervals")   \
2176                                                                             \
2177   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2178           "Time scale over which major costs decay")                        \
2179           range(0, max_uintx)                                               \
2180                                                                             \
2181   product(uintx, MinSurvivorRatio, 3,                                       \
2182           "Minimum ratio of young generation/survivor space size")          \
2183           range(3, max_uintx)                                               \
2184                                                                             \
2185   product(uintx, InitialSurvivorRatio, 8,                                   \
2186           "Initial ratio of young generation/survivor space size")          \
2187           range(0, max_uintx)                                               \
2188                                                                             \
2189   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2190           "Estimate of footprint other than Java Heap")                     \
2191           range(0, max_uintx)                                               \
2192                                                                             \
2193   product(bool, UseGCOverheadLimit, true,                                   \
2194           "Use policy to limit of proportion of time spent in GC "          \
2195           "before an OutOfMemory error is thrown")                          \
2196                                                                             \
2197   product(uintx, GCTimeLimit, 98,                                           \
2198           "Limit of the proportion of time spent in GC before "             \
2199           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2200           range(0, 100)                                                     \
2201                                                                             \
2202   product(uintx, GCHeapFreeLimit, 2,                                        \
2203           "Minimum percentage of free space after a full GC before an "     \
2204           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2205           range(0, 100)                                                     \
2206                                                                             \
2207   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2208           "Number of consecutive collections before gc time limit fires")   \
2209           range(1, max_uintx)                                               \
2210                                                                             \
2211   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2212           "How far ahead to prefetch destination area (<= 0 means off)")    \
2213           range(-1, max_jint)                                               \
2214                                                                             \
2215   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2216           "How far ahead to prefetch scan area (<= 0 means off)")           \
2217           range(-1, max_jint)                                               \
2218                                                                             \
2219   product(intx, PrefetchFieldsAhead, -1,                                    \
2220           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2221           range(-1, max_jint)                                               \
2222                                                                             \
2223   diagnostic(bool, VerifyDuringStartup, false,                              \
2224           "Verify memory system before executing any Java code "            \
2225           "during VM initialization")                                       \
2226                                                                             \
2227   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2228           "Verify system before exiting")                                   \
2229                                                                             \
2230   diagnostic(bool, VerifyBeforeGC, false,                                   \
2231           "Verify memory system before GC")                                 \
2232                                                                             \
2233   diagnostic(bool, VerifyAfterGC, false,                                    \
2234           "Verify memory system after GC")                                  \
2235                                                                             \
2236   diagnostic(bool, VerifyDuringGC, false,                                   \
2237           "Verify memory system during GC (between phases)")                \
2238                                                                             \
2239   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2240           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2241           "are enabled. One or more sub-systems can be specified "          \
2242           "in a comma separated string. Sub-systems are: "                  \
2243           "threads, heap, symbol_table, string_table, codecache, "          \
2244           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2245           "codecache_oops")                                                 \
2246                                                                             \
2247   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2248           "Enable parallel memory system verification")                     \
2249                                                                             \
2250   diagnostic(bool, DeferInitialCardMark, false,                             \
2251           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2252           "may arise from new_pre_store_barrier")                           \
2253                                                                             \
2254   product(bool, UseCondCardMark, false,                                     \
2255           "Check for already marked card before updating card table")       \
2256                                                                             \
2257   diagnostic(bool, VerifyRememberedSets, false,                             \
2258           "Verify GC remembered sets")                                      \
2259                                                                             \
2260   diagnostic(bool, VerifyObjectStartArray, true,                            \
2261           "Verify GC object start array if verify before/after")            \
2262                                                                             \
2263   product(bool, DisableExplicitGC, false,                                   \
2264           "Ignore calls to System.gc()")                                    \
2265                                                                             \
2266   notproduct(bool, CheckMemoryInitialization, false,                        \
2267           "Check memory initialization")                                    \
2268                                                                             \
2269   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2270           "Bind CMS Thread to CPU if possible")                             \
2271                                                                             \
2272   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2273           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2274           range(0, max_juint)                                               \
2275                                                                             \
2276   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2277           "Bind GCTaskThreads to CPUs if possible")                         \
2278                                                                             \
2279   product(bool, UseGCTaskAffinity, false,                                   \
2280           "Use worker affinity when asking for GCTasks")                    \
2281                                                                             \
2282   product(uintx, ProcessDistributionStride, 4,                              \
2283           "Stride through processors when distributing processes")          \
2284           range(0, max_juint)                                               \
2285                                                                             \
2286   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2287           "Number of times the coordinator GC thread will sleep while "     \
2288           "yielding before giving up and resuming GC")                      \
2289           range(0, max_juint)                                               \
2290                                                                             \
2291   product(uintx, CMSYieldSleepCount, 0,                                     \
2292           "Number of times a GC thread (minus the coordinator) "            \
2293           "will sleep while yielding before giving up and resuming GC")     \
2294           range(0, max_juint)                                               \
2295                                                                             \
2296   product(bool, PrintGC, false,                                             \
2297           "Print message at garbage collection. "                           \
2298           "Deprecated, use -Xlog:gc instead.")                              \
2299                                                                             \
2300   product(bool, PrintGCDetails, false,                                      \
2301           "Print more details at garbage collection. "                      \
2302           "Deprecated, use -Xlog:gc* instead.")                             \
2303                                                                             \
2304   develop(intx, ConcGCYieldTimeout, 0,                                      \
2305           "If non-zero, assert that GC threads yield within this "          \
2306           "number of milliseconds")                                         \
2307           range(0, max_intx)                                                \
2308                                                                             \
2309   develop(bool, TraceFinalizerRegistration, false,                          \
2310           "Trace registration of final references")                         \
2311                                                                             \
2312   notproduct(bool, TraceScavenge, false,                                    \
2313           "Trace scavenge")                                                 \
2314                                                                             \
2315   product(bool, IgnoreEmptyClassPaths, false,                               \
2316           "Ignore empty path elements in -classpath")                       \
2317                                                                             \
2318   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2319           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2320           "Initial size of the boot class loader data metaspace")           \
2321           range(30*K, max_uintx/BytesPerWord)                               \
2322           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2323                                                                             \
2324   product(bool, TraceYoungGenTime, false,                                   \
2325           "Trace accumulated time for young collection")                    \
2326                                                                             \
2327   product(bool, TraceOldGenTime, false,                                     \
2328           "Trace accumulated time for old collection")                      \
2329                                                                             \
2330   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2331           "Print heap layout in response to SIGBREAK")                      \
2332                                                                             \
2333   manageable(bool, PrintClassHistogram, false,                              \
2334           "Print a histogram of class instances")                           \
2335                                                                             \
2336   develop(bool, TraceGCTaskManager, false,                                  \
2337           "Trace actions of the GC task manager")                           \
2338                                                                             \
2339   develop(bool, TraceGCTaskQueue, false,                                    \
2340           "Trace actions of the GC task queues")                            \
2341                                                                             \
2342   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2343           "Trace marking phase in ParallelOldGC")                           \
2344                                                                             \
2345   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2346           "Trace dense prefix computation for ParallelOldGC")               \
2347                                                                             \
2348   develop(bool, IgnoreLibthreadGPFault, false,                              \
2349           "Suppress workaround for libthread GP fault")                     \
2350                                                                             \
2351   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2352           "The percentage of the used heap that the instances of a class "  \
2353           "must occupy for the class to generate a trace event")            \
2354           range(0.0, 100.0)                                                 \
2355                                                                             \
2356   /* JVMTI heap profiling */                                                \
2357                                                                             \
2358   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2359           "Trace JVMTI object tagging calls")                               \
2360                                                                             \
2361   diagnostic(bool, VerifyBeforeIteration, false,                            \
2362           "Verify memory system before JVMTI iteration")                    \
2363                                                                             \
2364   /* compiler interface */                                                  \
2365                                                                             \
2366   develop(bool, CIPrintCompilerName, false,                                 \
2367           "when CIPrint is active, print the name of the active compiler")  \
2368                                                                             \
2369   diagnostic(bool, CIPrintCompileQueue, false,                              \
2370           "display the contents of the compile queue whenever a "           \
2371           "compilation is enqueued")                                        \
2372                                                                             \
2373   develop(bool, CIPrintRequests, false,                                     \
2374           "display every request for compilation")                          \
2375                                                                             \
2376   product(bool, CITime, false,                                              \
2377           "collect timing information for compilation")                     \
2378                                                                             \
2379   develop(bool, CITimeVerbose, false,                                       \
2380           "be more verbose in compilation timings")                         \
2381                                                                             \
2382   develop(bool, CITimeEach, false,                                          \
2383           "display timing information after each successful compilation")   \
2384                                                                             \
2385   develop(bool, CICountOSR, false,                                          \
2386           "use a separate counter when assigning ids to osr compilations")  \
2387                                                                             \
2388   develop(bool, CICompileNatives, true,                                     \
2389           "compile native methods if supported by the compiler")            \
2390                                                                             \
2391   develop_pd(bool, CICompileOSR,                                            \
2392           "compile on stack replacement methods if supported by the "       \
2393           "compiler")                                                       \
2394                                                                             \
2395   develop(bool, CIPrintMethodCodes, false,                                  \
2396           "print method bytecodes of the compiled code")                    \
2397                                                                             \
2398   develop(bool, CIPrintTypeFlow, false,                                     \
2399           "print the results of ciTypeFlow analysis")                       \
2400                                                                             \
2401   develop(bool, CITraceTypeFlow, false,                                     \
2402           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2403                                                                             \
2404   develop(intx, OSROnlyBCI, -1,                                             \
2405           "OSR only at this bci.  Negative values mean exclude that bci")   \
2406                                                                             \
2407   /* compiler */                                                            \
2408                                                                             \
2409   /* notice: the max range value here is max_jint, not max_intx  */         \
2410   /* because of overflow issue                                   */         \
2411   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2412           "Number of compiler threads to run")                              \
2413           range(0, max_jint)                                                \
2414           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2415                                                                             \
2416   product(intx, CompilationPolicyChoice, 0,                                 \
2417           "which compilation policy (0-3)")                                 \
2418           range(0, 3)                                                       \
2419                                                                             \
2420   develop(bool, UseStackBanging, true,                                      \
2421           "use stack banging for stack overflow checks (required for "      \
2422           "proper StackOverflow handling; disable only to measure cost "    \
2423           "of stackbanging)")                                               \
2424                                                                             \
2425   develop(bool, UseStrictFP, true,                                          \
2426           "use strict fp if modifier strictfp is set")                      \
2427                                                                             \
2428   develop(bool, GenerateSynchronizationCode, true,                          \
2429           "generate locking/unlocking code for synchronized methods and "   \
2430           "monitors")                                                       \
2431                                                                             \
2432   develop(bool, GenerateRangeChecks, true,                                  \
2433           "Generate range checks for array accesses")                       \
2434                                                                             \
2435   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2436           "Generate code for implicit null checks")                         \
2437                                                                             \
2438   product_pd(bool, TrapBasedNullChecks,                                     \
2439           "Generate code for null checks that uses a cmp and trap "         \
2440           "instruction raising SIGTRAP.  This is only used if an access to" \
2441           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2442           "ImplicitNullChecks don't work (PPC64).")                         \
2443                                                                             \
2444   product(bool, PrintSafepointStatistics, false,                            \
2445           "Print statistics about safepoint synchronization")               \
2446                                                                             \
2447   product(intx, PrintSafepointStatisticsCount, 300,                         \
2448           "Total number of safepoint statistics collected "                 \
2449           "before printing them out")                                       \
2450           range(1, max_intx)                                                \
2451                                                                             \
2452   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2453           "Print safepoint statistics only when safepoint takes "           \
2454           "more than PrintSafepointSatisticsTimeout in millis")             \
2455   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2456   NOT_LP64(range(-1, max_intx))                                             \
2457                                                                             \
2458   product(bool, Inline, true,                                               \
2459           "Enable inlining")                                                \
2460                                                                             \
2461   product(bool, ClipInlining, true,                                         \
2462           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2463                                                                             \
2464   develop(bool, UseCHA, true,                                               \
2465           "Enable CHA")                                                     \
2466                                                                             \
2467   product(bool, UseTypeProfile, true,                                       \
2468           "Check interpreter profile for historically monomorphic calls")   \
2469                                                                             \
2470   diagnostic(bool, PrintInlining, false,                                    \
2471           "Print inlining optimizations")                                   \
2472                                                                             \
2473   product(bool, UsePopCountInstruction, false,                              \
2474           "Use population count instruction")                               \
2475                                                                             \
2476   develop(bool, EagerInitialization, false,                                 \
2477           "Eagerly initialize classes if possible")                         \
2478                                                                             \
2479   diagnostic(bool, LogTouchedMethods, false,                                \
2480           "Log methods which have been ever touched in runtime")            \
2481                                                                             \
2482   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2483           "Print all methods that have been ever touched in runtime")       \
2484                                                                             \
2485   develop(bool, TraceMethodReplacement, false,                              \
2486           "Print when methods are replaced do to recompilation")            \
2487                                                                             \
2488   develop(bool, PrintMethodFlushing, false,                                 \
2489           "Print the nmethods being flushed")                               \
2490                                                                             \
2491   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2492           "print statistics about method flushing")                         \
2493                                                                             \
2494   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2495           "Number of compiled code invocations after which "                \
2496           "the method is considered as hot by the flusher")                 \
2497           range(1, max_jint)                                                \
2498                                                                             \
2499   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2500           "Minimum number of sweeper passes before an nmethod "             \
2501           "can be flushed")                                                 \
2502           range(0, max_intx)                                                \
2503                                                                             \
2504   product(bool, UseCodeAging, true,                                         \
2505           "Insert counter to detect warm methods")                          \
2506                                                                             \
2507   diagnostic(bool, StressCodeAging, false,                                  \
2508           "Start with counters compiled in")                                \
2509                                                                             \
2510   develop(bool, UseRelocIndex, false,                                       \
2511           "Use an index to speed random access to relocations")             \
2512                                                                             \
2513   develop(bool, StressCodeBuffers, false,                                   \
2514           "Exercise code buffer expansion and other rare state changes")    \
2515                                                                             \
2516   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2517           "Generate extra debugging information for non-safepoints in "     \
2518           "nmethods")                                                       \
2519                                                                             \
2520   product(bool, PrintVMOptions, false,                                      \
2521           "Print flags that appeared on the command line")                  \
2522                                                                             \
2523   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2524           "Ignore unrecognized VM options")                                 \
2525                                                                             \
2526   product(bool, PrintCommandLineFlags, false,                               \
2527           "Print flags specified on command line or set by ergonomics")     \
2528                                                                             \
2529   product(bool, PrintFlagsInitial, false,                                   \
2530           "Print all VM flags before argument processing and exit VM")      \
2531                                                                             \
2532   product(bool, PrintFlagsFinal, false,                                     \
2533           "Print all VM flags after argument and ergonomic processing")     \
2534                                                                             \
2535   notproduct(bool, PrintFlagsWithComments, false,                           \
2536           "Print all VM flags with default values and descriptions and "    \
2537           "exit")                                                           \
2538                                                                             \
2539   product(bool, PrintFlagsRanges, false,                                    \
2540           "Print VM flags and their ranges and exit VM")                    \
2541                                                                             \
2542   diagnostic(bool, SerializeVMOutput, true,                                 \
2543           "Use a mutex to serialize output to tty and LogFile")             \
2544                                                                             \
2545   diagnostic(bool, DisplayVMOutput, true,                                   \
2546           "Display all VM output on the tty, independently of LogVMOutput") \
2547                                                                             \
2548   diagnostic(bool, LogVMOutput, false,                                      \
2549           "Save VM output to LogFile")                                      \
2550                                                                             \
2551   diagnostic(ccstr, LogFile, NULL,                                          \
2552           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2553           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2554                                                                             \
2555   product(ccstr, ErrorFile, NULL,                                           \
2556           "If an error occurs, save the error data to this file "           \
2557           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2558                                                                             \
2559   product(bool, DisplayVMOutputToStderr, false,                             \
2560           "If DisplayVMOutput is true, display all VM output to stderr")    \
2561                                                                             \
2562   product(bool, DisplayVMOutputToStdout, false,                             \
2563           "If DisplayVMOutput is true, display all VM output to stdout")    \
2564                                                                             \
2565   product(bool, UseHeavyMonitors, false,                                    \
2566           "use heavyweight instead of lightweight Java monitors")           \
2567                                                                             \
2568   product(bool, PrintStringTableStatistics, false,                          \
2569           "print statistics about the StringTable and SymbolTable")         \
2570                                                                             \
2571   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2572           "verify StringTable contents at exit")                            \
2573                                                                             \
2574   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2575           "print histogram of the symbol table")                            \
2576                                                                             \
2577   notproduct(bool, ExitVMOnVerifyError, false,                              \
2578           "standard exit from VM if bytecode verify error "                 \
2579           "(only in debug mode)")                                           \
2580                                                                             \
2581   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2582           "Call fatal if this exception is thrown.  Example: "              \
2583           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2584                                                                             \
2585   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2586           "Call fatal if the exception pointed by AbortVMOnException "      \
2587           "has this message")                                               \
2588                                                                             \
2589   develop(bool, DebugVtables, false,                                        \
2590           "add debugging code to vtable dispatch")                          \
2591                                                                             \
2592   notproduct(bool, PrintVtableStats, false,                                 \
2593           "print vtables stats at end of run")                              \
2594                                                                             \
2595   develop(bool, TraceCreateZombies, false,                                  \
2596           "trace creation of zombie nmethods")                              \
2597                                                                             \
2598   notproduct(bool, IgnoreLockingAssertions, false,                          \
2599           "disable locking assertions (for speed)")                         \
2600                                                                             \
2601   product(bool, RangeCheckElimination, true,                                \
2602           "Eliminate range checks")                                         \
2603                                                                             \
2604   develop_pd(bool, UncommonNullCast,                                        \
2605           "track occurrences of null in casts; adjust compiler tactics")    \
2606                                                                             \
2607   develop(bool, TypeProfileCasts,  true,                                    \
2608           "treat casts like calls for purposes of type profiling")          \
2609                                                                             \
2610   develop(bool, DelayCompilationDuringStartup, true,                        \
2611           "Delay invoking the compiler until main application class is "    \
2612           "loaded")                                                         \
2613                                                                             \
2614   develop(bool, CompileTheWorld, false,                                     \
2615           "Compile all methods in all classes in bootstrap class path "     \
2616             "(stress test)")                                                \
2617                                                                             \
2618   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2619           "Preload all classes used by a class before start loading")       \
2620                                                                             \
2621   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2622           "Force a safepoint every n compiles so sweeper can keep up")      \
2623                                                                             \
2624   develop(bool, FillDelaySlots, true,                                       \
2625           "Fill delay slots (on SPARC only)")                               \
2626                                                                             \
2627   develop(bool, TimeLivenessAnalysis, false,                                \
2628           "Time computation of bytecode liveness analysis")                 \
2629                                                                             \
2630   develop(bool, TraceLivenessGen, false,                                    \
2631           "Trace the generation of liveness analysis information")          \
2632                                                                             \
2633   notproduct(bool, TraceLivenessQuery, false,                               \
2634           "Trace queries of liveness analysis information")                 \
2635                                                                             \
2636   notproduct(bool, CollectIndexSetStatistics, false,                        \
2637           "Collect information about IndexSets")                            \
2638                                                                             \
2639   develop(bool, UseLoopSafepoints, true,                                    \
2640           "Generate Safepoint nodes in every loop")                         \
2641                                                                             \
2642   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2643           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2644           "Inline allocations larger than this in doublewords must go slow")\
2645                                                                             \
2646   product(bool, AggressiveOpts, false,                                      \
2647           "Enable aggressive optimizations - see arguments.cpp")            \
2648                                                                             \
2649   product_pd(bool, CompactStrings,                                          \
2650           "Enable Strings to use single byte chars in backing store")       \
2651                                                                             \
2652   product_pd(uintx, TypeProfileLevel,                                       \
2653           "=XYZ, with Z: Type profiling of arguments at call; "             \
2654                      "Y: Type profiling of return value at call; "          \
2655                      "X: Type profiling of parameters to methods; "         \
2656           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2657           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2658                                                                             \
2659   product(intx, TypeProfileArgsLimit,     2,                                \
2660           "max number of call arguments to consider for type profiling")    \
2661           range(0, 16)                                                      \
2662                                                                             \
2663   product(intx, TypeProfileParmsLimit,    2,                                \
2664           "max number of incoming parameters to consider for type profiling"\
2665           ", -1 for all")                                                   \
2666           range(-1, 64)                                                     \
2667                                                                             \
2668   /* statistics */                                                          \
2669   develop(bool, CountCompiledCalls, false,                                  \
2670           "Count method invocations")                                       \
2671                                                                             \
2672   notproduct(bool, CountRuntimeCalls, false,                                \
2673           "Count VM runtime calls")                                         \
2674                                                                             \
2675   develop(bool, CountJNICalls, false,                                       \
2676           "Count jni method invocations")                                   \
2677                                                                             \
2678   notproduct(bool, CountJVMCalls, false,                                    \
2679           "Count jvm method invocations")                                   \
2680                                                                             \
2681   notproduct(bool, CountRemovableExceptions, false,                         \
2682           "Count exceptions that could be replaced by branches due to "     \
2683           "inlining")                                                       \
2684                                                                             \
2685   notproduct(bool, ICMissHistogram, false,                                  \
2686           "Produce histogram of IC misses")                                 \
2687                                                                             \
2688   /* interpreter */                                                         \
2689   product_pd(bool, RewriteBytecodes,                                        \
2690           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2691                                                                             \
2692   product_pd(bool, RewriteFrequentPairs,                                    \
2693           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2694                                                                             \
2695   diagnostic(bool, PrintInterpreter, false,                                 \
2696           "Print the generated interpreter code")                           \
2697                                                                             \
2698   product(bool, UseInterpreter, true,                                       \
2699           "Use interpreter for non-compiled methods")                       \
2700                                                                             \
2701   develop(bool, UseFastSignatureHandlers, true,                             \
2702           "Use fast signature handlers for native calls")                   \
2703                                                                             \
2704   product(bool, UseLoopCounter, true,                                       \
2705           "Increment invocation counter on backward branch")                \
2706                                                                             \
2707   product_pd(bool, UseOnStackReplacement,                                   \
2708           "Use on stack replacement, calls runtime if invoc. counter "      \
2709           "overflows in loop")                                              \
2710                                                                             \
2711   notproduct(bool, TraceOnStackReplacement, false,                          \
2712           "Trace on stack replacement")                                     \
2713                                                                             \
2714   product_pd(bool, PreferInterpreterNativeStubs,                            \
2715           "Use always interpreter stubs for native methods invoked via "    \
2716           "interpreter")                                                    \
2717                                                                             \
2718   develop(bool, CountBytecodes, false,                                      \
2719           "Count number of bytecodes executed")                             \
2720                                                                             \
2721   develop(bool, PrintBytecodeHistogram, false,                              \
2722           "Print histogram of the executed bytecodes")                      \
2723                                                                             \
2724   develop(bool, PrintBytecodePairHistogram, false,                          \
2725           "Print histogram of the executed bytecode pairs")                 \
2726                                                                             \
2727   diagnostic(bool, PrintSignatureHandlers, false,                           \
2728           "Print code generated for native method signature handlers")      \
2729                                                                             \
2730   develop(bool, VerifyOops, false,                                          \
2731           "Do plausibility checks for oops")                                \
2732                                                                             \
2733   develop(bool, CheckUnhandledOops, false,                                  \
2734           "Check for unhandled oops in VM code")                            \
2735                                                                             \
2736   develop(bool, VerifyJNIFields, trueInDebug,                               \
2737           "Verify jfieldIDs for instance fields")                           \
2738                                                                             \
2739   notproduct(bool, VerifyJNIEnvThread, false,                               \
2740           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2741           "from JNI")                                                       \
2742                                                                             \
2743   develop(bool, VerifyFPU, false,                                           \
2744           "Verify FPU state (check for NaN's, etc.)")                       \
2745                                                                             \
2746   develop(bool, VerifyThread, false,                                        \
2747           "Watch the thread register for corruption (SPARC only)")          \
2748                                                                             \
2749   develop(bool, VerifyActivationFrameSize, false,                           \
2750           "Verify that activation frame didn't become smaller than its "    \
2751           "minimal size")                                                   \
2752                                                                             \
2753   develop(bool, TraceFrequencyInlining, false,                              \
2754           "Trace frequency based inlining")                                 \
2755                                                                             \
2756   develop_pd(bool, InlineIntrinsics,                                        \
2757           "Inline intrinsics that can be statically resolved")              \
2758                                                                             \
2759   product_pd(bool, ProfileInterpreter,                                      \
2760           "Profile at the bytecode level during interpretation")            \
2761                                                                             \
2762   develop(bool, TraceProfileInterpreter, false,                             \
2763           "Trace profiling at the bytecode level during interpretation. "   \
2764           "This outputs the profiling information collected to improve "    \
2765           "jit compilation.")                                               \
2766                                                                             \
2767   develop_pd(bool, ProfileTraps,                                            \
2768           "Profile deoptimization traps at the bytecode level")             \
2769                                                                             \
2770   product(intx, ProfileMaturityPercentage, 20,                              \
2771           "number of method invocations/branches (expressed as % of "       \
2772           "CompileThreshold) before using the method's profile")            \
2773           range(0, 100)                                                     \
2774                                                                             \
2775   diagnostic(bool, PrintMethodData, false,                                  \
2776           "Print the results of +ProfileInterpreter at end of run")         \
2777                                                                             \
2778   develop(bool, VerifyDataPointer, trueInDebug,                             \
2779           "Verify the method data pointer during interpreter profiling")    \
2780                                                                             \
2781   develop(bool, VerifyCompiledCode, false,                                  \
2782           "Include miscellaneous runtime verifications in nmethod code; "   \
2783           "default off because it disturbs nmethod size heuristics")        \
2784                                                                             \
2785   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2786           "Manually make GC thread crash then dump java stack trace;  "     \
2787           "Test only")                                                      \
2788                                                                             \
2789   /* compilation */                                                         \
2790   product(bool, UseCompiler, true,                                          \
2791           "Use Just-In-Time compilation")                                   \
2792                                                                             \
2793   develop(bool, TraceCompilationPolicy, false,                              \
2794           "Trace compilation policy")                                       \
2795                                                                             \
2796   develop(bool, TimeCompilationPolicy, false,                               \
2797           "Time the compilation policy")                                    \
2798                                                                             \
2799   product(bool, UseCounterDecay, true,                                      \
2800           "Adjust recompilation counters")                                  \
2801                                                                             \
2802   develop(intx, CounterHalfLifeTime,    30,                                 \
2803           "Half-life time of invocation counters (in seconds)")             \
2804                                                                             \
2805   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2806           "The minimum interval (in milliseconds) between invocation of "   \
2807           "CounterDecay")                                                   \
2808                                                                             \
2809   product(bool, AlwaysCompileLoopMethods, false,                            \
2810           "When using recompilation, never interpret methods "              \
2811           "containing loops")                                               \
2812                                                                             \
2813   product(bool, DontCompileHugeMethods, true,                               \
2814           "Do not compile methods > HugeMethodLimit")                       \
2815                                                                             \
2816   /* Bytecode escape analysis estimation. */                                \
2817   product(bool, EstimateArgEscape, true,                                    \
2818           "Analyze bytecodes to estimate escape state of arguments")        \
2819                                                                             \
2820   product(intx, BCEATraceLevel, 0,                                          \
2821           "How much tracing to do of bytecode escape analysis estimates "   \
2822           "(0-3)")                                                          \
2823           range(0, 3)                                                       \
2824                                                                             \
2825   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2826           "Maximum number of nested calls that are analyzed by BC EA")      \
2827           range(0, max_jint)                                                \
2828                                                                             \
2829   product(intx, MaxBCEAEstimateSize, 150,                                   \
2830           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2831           range(0, max_jint)                                                \
2832                                                                             \
2833   product(intx,  AllocatePrefetchStyle, 1,                                  \
2834           "0 = no prefetch, "                                               \
2835           "1 = generate prefetch instructions for each allocation, "        \
2836           "2 = use TLAB watermark to gate allocation prefetch, "            \
2837           "3 = generate one prefetch instruction per cache line")           \
2838           range(0, 3)                                                       \
2839                                                                             \
2840   product(intx,  AllocatePrefetchDistance, -1,                              \
2841           "Distance to prefetch ahead of allocation pointer. "              \
2842           "-1: use system-specific value (automatically determined")        \
2843           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2844                                                                             \
2845   product(intx,  AllocatePrefetchLines, 3,                                  \
2846           "Number of lines to prefetch ahead of array allocation pointer")  \
2847           range(1, 64)                                                      \
2848                                                                             \
2849   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2850           "Number of lines to prefetch ahead of instance allocation "       \
2851           "pointer")                                                        \
2852           range(1, 64)                                                      \
2853                                                                             \
2854   product(intx,  AllocatePrefetchStepSize, 16,                              \
2855           "Step size in bytes of sequential prefetch instructions")         \
2856           range(1, 512)                                                     \
2857           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2858                                                                             \
2859   product(intx,  AllocatePrefetchInstr, 0,                                  \
2860           "Select instruction to prefetch ahead of allocation pointer")     \
2861           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2862                                                                             \
2863   /* deoptimization */                                                      \
2864   develop(bool, TraceDeoptimization, false,                                 \
2865           "Trace deoptimization")                                           \
2866                                                                             \
2867   develop(bool, PrintDeoptimizationDetails, false,                          \
2868           "Print more information about deoptimization")                    \
2869                                                                             \
2870   develop(bool, DebugDeoptimization, false,                                 \
2871           "Tracing various information while debugging deoptimization")     \
2872                                                                             \
2873   product(intx, SelfDestructTimer, 0,                                       \
2874           "Will cause VM to terminate after a given time (in minutes) "     \
2875           "(0 means off)")                                                  \
2876           range(0, max_intx)                                                \
2877                                                                             \
2878   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2879           "The maximum number of lines in the stack trace for Java "        \
2880           "exceptions (0 means all)")                                       \
2881           range(0, max_jint/2)                                              \
2882                                                                             \
2883   develop(bool, TraceStackWalk, false,                                      \
2884           "Trace stack walking")                                            \
2885                                                                             \
2886   /* notice: the max range value here is max_jint, not max_intx  */         \
2887   /* because of overflow issue                                   */         \
2888   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2889           "Guarantee a safepoint (at least) every so many milliseconds "    \
2890           "(0 means none)")                                                 \
2891           range(0, max_jint)                                                \
2892                                                                             \
2893   product(intx, SafepointTimeoutDelay, 10000,                               \
2894           "Delay in milliseconds for option SafepointTimeout")              \
2895   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2896   NOT_LP64(range(0, max_intx))                                              \
2897                                                                             \
2898   product(intx, NmethodSweepActivity, 10,                                   \
2899           "Removes cold nmethods from code cache if > 0. Higher values "    \
2900           "result in more aggressive sweeping")                             \
2901           range(0, 2000)                                                    \
2902                                                                             \
2903   notproduct(bool, LogSweeper, false,                                       \
2904           "Keep a ring buffer of sweeper activity")                         \
2905                                                                             \
2906   notproduct(intx, SweeperLogEntries, 1024,                                 \
2907           "Number of records in the ring buffer of sweeper activity")       \
2908                                                                             \
2909   notproduct(intx, MemProfilingInterval, 500,                               \
2910           "Time between each invocation of the MemProfiler")                \
2911                                                                             \
2912   develop(intx, MallocCatchPtr, -1,                                         \
2913           "Hit breakpoint when mallocing/freeing this pointer")             \
2914                                                                             \
2915   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2916           "List of assertions (file:line) to muzzle")                       \
2917                                                                             \
2918   develop(intx, StackPrintLimit, 100,                                       \
2919           "number of stack frames to print in VM-level stack dump")         \
2920                                                                             \
2921   notproduct(intx, MaxElementPrintSize, 256,                                \
2922           "maximum number of elements to print")                            \
2923                                                                             \
2924   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2925           "maximum number of subklasses to print when printing klass")      \
2926                                                                             \
2927   product(intx, MaxInlineLevel, 9,                                          \
2928           "maximum number of nested calls that are inlined")                \
2929           range(0, max_jint)                                                \
2930                                                                             \
2931   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2932           "maximum number of nested recursive calls that are inlined")      \
2933           range(0, max_jint)                                                \
2934                                                                             \
2935   develop(intx, MaxForceInlineLevel, 100,                                   \
2936           "maximum number of nested calls that are forced for inlining "    \
2937           "(using CompileCommand or marked w/ @ForceInline)")               \
2938           range(0, max_jint)                                                \
2939                                                                             \
2940   product_pd(intx, InlineSmallCode,                                         \
2941           "Only inline already compiled methods if their code size is "     \
2942           "less than this")                                                 \
2943           range(0, max_jint)                                                \
2944                                                                             \
2945   product(intx, MaxInlineSize, 35,                                          \
2946           "The maximum bytecode size of a method to be inlined")            \
2947           range(0, max_jint)                                                \
2948                                                                             \
2949   product_pd(intx, FreqInlineSize,                                          \
2950           "The maximum bytecode size of a frequent method to be inlined")   \
2951           range(0, max_jint)                                                \
2952                                                                             \
2953   product(intx, MaxTrivialSize, 6,                                          \
2954           "The maximum bytecode size of a trivial method to be inlined")    \
2955           range(0, max_jint)                                                \
2956                                                                             \
2957   product(intx, MinInliningThreshold, 250,                                  \
2958           "The minimum invocation count a method needs to have to be "      \
2959           "inlined")                                                        \
2960           range(0, max_jint)                                                \
2961                                                                             \
2962   develop(intx, MethodHistogramCutoff, 100,                                 \
2963           "The cutoff value for method invocation histogram (+CountCalls)") \
2964                                                                             \
2965   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2966           "Number of interpreted methods to show in profile")               \
2967                                                                             \
2968   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2969           "Number of compiled methods to show in profile")                  \
2970                                                                             \
2971   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2972           "Number of stub methods to show in profile")                      \
2973                                                                             \
2974   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2975           "Number of runtime stub nodes to show in profile")                \
2976                                                                             \
2977   product(intx, ProfileIntervalsTicks, 100,                                 \
2978           "Number of ticks between printing of interval profile "           \
2979           "(+ProfileIntervals)")                                            \
2980           range(0, max_intx)                                                \
2981                                                                             \
2982   notproduct(intx, ScavengeALotInterval,     1,                             \
2983           "Interval between which scavenge will occur with +ScavengeALot")  \
2984                                                                             \
2985   notproduct(intx, FullGCALotInterval,     1,                               \
2986           "Interval between which full gc will occur with +FullGCALot")     \
2987                                                                             \
2988   notproduct(intx, FullGCALotStart,     0,                                  \
2989           "For which invocation to start FullGCAlot")                       \
2990                                                                             \
2991   notproduct(intx, FullGCALotDummies,  32*K,                                \
2992           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2993           "to move")                                                        \
2994                                                                             \
2995   develop(intx, DontYieldALotInterval,    10,                               \
2996           "Interval between which yields will be dropped (milliseconds)")   \
2997                                                                             \
2998   develop(intx, MinSleepInterval,     1,                                    \
2999           "Minimum sleep() interval (milliseconds) when "                   \
3000           "ConvertSleepToYield is off (used for Solaris)")                  \
3001                                                                             \
3002   develop(intx, ProfilerPCTickThreshold,    15,                             \
3003           "Number of ticks in a PC buckets to be a hotspot")                \
3004                                                                             \
3005   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3006           "Number of exits until DeoptimizeALot kicks in")                  \
3007                                                                             \
3008   notproduct(intx, ZombieALotInterval,     5,                               \
3009           "Number of exits until ZombieALot kicks in")                      \
3010                                                                             \
3011   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3012           "If non-zero, maximum number of words that malloc/realloc can "   \
3013           "allocate (for testing only)")                                    \
3014           range(0, max_uintx)                                               \
3015                                                                             \
3016   product(intx, TypeProfileWidth, 2,                                        \
3017           "Number of receiver types to record in call/cast profile")        \
3018           range(0, 8)                                                       \
3019                                                                             \
3020   develop(intx, BciProfileWidth,      2,                                    \
3021           "Number of return bci's to record in ret profile")                \
3022                                                                             \
3023   product(intx, PerMethodRecompilationCutoff, 400,                          \
3024           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3025           range(-1, max_intx)                                               \
3026                                                                             \
3027   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3028           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3029           range(-1, max_intx)                                               \
3030                                                                             \
3031   product(intx, PerMethodTrapLimit,  100,                                   \
3032           "Limit on traps (of one kind) in a method (includes inlines)")    \
3033           range(0, max_jint)                                                \
3034                                                                             \
3035   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3036           "Limit on speculative traps (of one kind) in a method "           \
3037           "(includes inlines)")                                             \
3038           range(0, max_jint)                                                \
3039                                                                             \
3040   product(intx, PerBytecodeTrapLimit,  4,                                   \
3041           "Limit on traps (of one kind) at a particular BCI")               \
3042           range(0, max_jint)                                                \
3043                                                                             \
3044   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3045           "Extra method data trap entries for speculation")                 \
3046                                                                             \
3047   develop(intx, InlineFrequencyRatio,    20,                                \
3048           "Ratio of call site execution to caller method invocation")       \
3049           range(0, max_jint)                                                \
3050                                                                             \
3051   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3052           "Count of call site execution necessary to trigger frequent "     \
3053           "inlining")                                                       \
3054           range(0, max_jint)                                                \
3055                                                                             \
3056   develop(intx, InlineThrowCount,    50,                                    \
3057           "Force inlining of interpreted methods that throw this often")    \
3058           range(0, max_jint)                                                \
3059                                                                             \
3060   develop(intx, InlineThrowMaxSize,   200,                                  \
3061           "Force inlining of throwing methods smaller than this")           \
3062           range(0, max_jint)                                                \
3063                                                                             \
3064   develop(intx, ProfilerNodeSize,  1024,                                    \
3065           "Size in K to allocate for the Profile Nodes of each thread")     \
3066           range(0, 1024)                                                    \
3067                                                                             \
3068   /* gc parameters */                                                       \
3069   product(size_t, InitialHeapSize, 0,                                       \
3070           "Initial heap size (in bytes); zero means use ergonomics")        \
3071           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3072                                                                             \
3073   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3074           "Maximum heap size (in bytes)")                                   \
3075           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3076                                                                             \
3077   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3078           "Initial tenured generation size (in bytes)")                     \
3079           range(0, max_uintx)                                               \
3080                                                                             \
3081   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3082           "Initial new generation size (in bytes)")                         \
3083           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3084                                                                             \
3085   product(size_t, MaxNewSize, max_uintx,                                    \
3086           "Maximum new generation size (in bytes), max_uintx means set "    \
3087           "ergonomically")                                                  \
3088           range(0, max_uintx)                                               \
3089                                                                             \
3090   product_pd(size_t, HeapBaseMinAddress,                                    \
3091           "OS specific low limit for heap base address")                    \
3092           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3093                                                                             \
3094   product(size_t, PretenureSizeThreshold, 0,                                \
3095           "Maximum size in bytes of objects allocated in DefNew "           \
3096           "generation; zero means no maximum")                              \
3097           range(0, max_uintx)                                               \
3098                                                                             \
3099   product(size_t, MinTLABSize, 2*K,                                         \
3100           "Minimum allowed TLAB size (in bytes)")                           \
3101           range(1, max_uintx/2)                                             \
3102           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3103                                                                             \
3104   product(size_t, TLABSize, 0,                                              \
3105           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3106           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3107                                                                             \
3108   product(size_t, YoungPLABSize, 4096,                                      \
3109           "Size of young gen promotion LAB's (in HeapWords)")               \
3110           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3111                                                                             \
3112   product(size_t, OldPLABSize, 1024,                                        \
3113           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3114           "of blocks to attempt to claim when refilling CMS LAB's")         \
3115           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3116                                                                             \
3117   product(uintx, TLABAllocationWeight, 35,                                  \
3118           "Allocation averaging weight")                                    \
3119           range(0, 100)                                                     \
3120                                                                             \
3121   /* Limit the lower bound of this flag to 1 as it is used  */              \
3122   /* in a division expression.                              */              \
3123   product(uintx, TLABWasteTargetPercent, 1,                                 \
3124           "Percentage of Eden that can be wasted")                          \
3125           range(1, 100)                                                     \
3126                                                                             \
3127   product(uintx, TLABRefillWasteFraction,    64,                            \
3128           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3129           range(1, max_juint)                                               \
3130                                                                             \
3131   product(uintx, TLABWasteIncrement,    4,                                  \
3132           "Increment allowed waste at slow allocation")                     \
3133           range(0, max_jint)                                                \
3134           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3135                                                                             \
3136   product(uintx, SurvivorRatio, 8,                                          \
3137           "Ratio of eden/survivor space size")                              \
3138           range(1, max_uintx-2)                                             \
3139           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3140                                                                             \
3141   product(uintx, NewRatio, 2,                                               \
3142           "Ratio of old/new generation sizes")                              \
3143           range(0, max_uintx-1)                                             \
3144                                                                             \
3145   product_pd(size_t, NewSizeThreadIncrease,                                 \
3146           "Additional size added to desired new generation size per "       \
3147           "non-daemon thread (in bytes)")                                   \
3148           range(0, max_uintx)                                               \
3149                                                                             \
3150   product_pd(size_t, MetaspaceSize,                                         \
3151           "Initial threshold (in bytes) at which a garbage collection "     \
3152           "is done to reduce Metaspace usage")                              \
3153           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3154                                                                             \
3155   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3156           "Maximum size of Metaspaces (in bytes)")                          \
3157           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3158                                                                             \
3159   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3160           "Maximum size of class area in Metaspace when compressed "        \
3161           "class pointers are used")                                        \
3162           range(1*M, 3*G)                                                   \
3163                                                                             \
3164   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3165           "The minimum percentage of heap free after GC to avoid expansion."\
3166           " For most GCs this applies to the old generation. In G1 and"     \
3167           " ParallelGC it applies to the whole heap.")                      \
3168           range(0, 100)                                                     \
3169           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3170                                                                             \
3171   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3172           "The maximum percentage of heap free after GC to avoid shrinking."\
3173           " For most GCs this applies to the old generation. In G1 and"     \
3174           " ParallelGC it applies to the whole heap.")                      \
3175           range(0, 100)                                                     \
3176           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3177                                                                             \
3178   product(bool, ShrinkHeapInSteps, true,                                    \
3179           "When disabled, informs the GC to shrink the java heap directly"  \
3180           " to the target size at the next full GC rather than requiring"   \
3181           " smaller steps during multiple full GCs.")                       \
3182                                                                             \
3183   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3184           "Number of milliseconds per MB of free space in the heap")        \
3185           range(0, max_intx)                                                \
3186           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3187                                                                             \
3188   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3189           "The minimum change in heap space due to GC (in bytes)")          \
3190           range(0, max_uintx)                                               \
3191                                                                             \
3192   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3193           "The minimum expansion of Metaspace (in bytes)")                  \
3194           range(0, max_uintx)                                               \
3195                                                                             \
3196   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3197           "The maximum percentage of Metaspace free after GC to avoid "     \
3198           "shrinking")                                                      \
3199           range(0, 100)                                                     \
3200           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3201                                                                             \
3202   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3203           "The minimum percentage of Metaspace free after GC to avoid "     \
3204           "expansion")                                                      \
3205           range(0, 99)                                                      \
3206           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3207                                                                             \
3208   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3209           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3210           range(0, max_uintx)                                               \
3211                                                                             \
3212   product(uintx, QueuedAllocationWarningCount, 0,                           \
3213           "Number of times an allocation that queues behind a GC "          \
3214           "will retry before printing a warning")                           \
3215           range(0, max_uintx)                                               \
3216                                                                             \
3217   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3218           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3219           range(0, max_uintx)                                               \
3220                                                                             \
3221   diagnostic(intx, VerifyGCLevel,     0,                                    \
3222           "Generation level at which to start +VerifyBefore/AfterGC")       \
3223           range(0, 1)                                                       \
3224                                                                             \
3225   product(uintx, MaxTenuringThreshold,    15,                               \
3226           "Maximum value for tenuring threshold")                           \
3227           range(0, markOopDesc::max_age + 1)                                \
3228           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3229                                                                             \
3230   product(uintx, InitialTenuringThreshold,    7,                            \
3231           "Initial value for tenuring threshold")                           \
3232           range(0, markOopDesc::max_age + 1)                                \
3233           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3234                                                                             \
3235   product(uintx, TargetSurvivorRatio,    50,                                \
3236           "Desired percentage of survivor space used after scavenge")       \
3237           range(0, 100)                                                     \
3238                                                                             \
3239   product(uintx, MarkSweepDeadRatio,     5,                                 \
3240           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3241           "Serial mark sweep treats this as both the minimum and maximum "  \
3242           "value. "                                                         \
3243           "CMS uses this value only if it falls back to mark sweep. "       \
3244           "Par compact uses a variable scale based on the density of the "  \
3245           "generation and treats this as the maximum value when the heap "  \
3246           "is either completely full or completely empty.  Par compact "    \
3247           "also has a smaller default value; see arguments.cpp.")           \
3248           range(0, 100)                                                     \
3249                                                                             \
3250   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3251           "How often should we fully compact the heap (ignoring the dead "  \
3252           "space parameters)")                                              \
3253           range(1, max_juint)                                               \
3254                                                                             \
3255   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3256           "Delay between expansion and allocation (in milliseconds)")       \
3257                                                                             \
3258   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3259           "Delay in scheduling GC workers (in milliseconds)")               \
3260                                                                             \
3261   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3262           "(Unstable) Number of times to iterate in safepoint loop "        \
3263           "before blocking VM threads ")                                    \
3264           range(-1, max_jint-1)                                             \
3265                                                                             \
3266   product(intx, DeferPollingPageLoopCount,     -1,                          \
3267           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3268           "before changing safepoint polling page to RO ")                  \
3269           range(-1, max_jint-1)                                             \
3270                                                                             \
3271   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3272           range(0, max_intx)                                                \
3273                                                                             \
3274   product(bool, PSChunkLargeArrays, true,                                   \
3275           "Process large arrays in chunks")                                 \
3276                                                                             \
3277   product(uintx, GCDrainStackTargetSize, 64,                                \
3278           "Number of entries we will try to leave on the stack "            \
3279           "during parallel gc")                                             \
3280           range(0, max_juint)                                               \
3281                                                                             \
3282   /* stack parameters */                                                    \
3283   product_pd(intx, StackYellowPages,                                        \
3284           "Number of yellow zone (recoverable overflows) pages of size "    \
3285           "4KB. If pages are bigger yellow zone is aligned up.")            \
3286           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3287                                                                             \
3288   product_pd(intx, StackRedPages,                                           \
3289           "Number of red zone (unrecoverable overflows) pages of size "     \
3290           "4KB. If pages are bigger red zone is aligned up.")               \
3291           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3292                                                                             \
3293   product_pd(intx, StackReservedPages,                                      \
3294           "Number of reserved zone (reserved to annotated methods) pages"   \
3295           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3296           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3297                                                                             \
3298   product(bool, RestrictReservedStack, true,                                \
3299           "Restrict @ReservedStackAccess to trusted classes")               \
3300                                                                             \
3301   /* greater stack shadow pages can't generate instruction to bang stack */ \
3302   product_pd(intx, StackShadowPages,                                        \
3303           "Number of shadow zone (for overflow checking) pages of size "    \
3304           "4KB. If pages are bigger shadow zone is aligned up. "            \
3305           "This should exceed the depth of the VM and native call stack.")  \
3306           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3307                                                                             \
3308   product_pd(intx, ThreadStackSize,                                         \
3309           "Thread Stack Size (in Kbytes)")                                  \
3310           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3311                                                                             \
3312   product_pd(intx, VMThreadStackSize,                                       \
3313           "Non-Java Thread Stack Size (in Kbytes)")                         \
3314           range(0, max_intx/(1 * K))                                        \
3315                                                                             \
3316   product_pd(intx, CompilerThreadStackSize,                                 \
3317           "Compiler Thread Stack Size (in Kbytes)")                         \
3318           range(0, max_intx/(1 * K))                                        \
3319                                                                             \
3320   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3321           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3322                                                                             \
3323   /* code cache parameters                                    */            \
3324   /* ppc64/tiered compilation has large code-entry alignment. */            \
3325   develop(uintx, CodeCacheSegmentSize,                                      \
3326           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3327           "Code cache segment size (in bytes) - smallest unit of "          \
3328           "allocation")                                                     \
3329           range(1, 1024)                                                    \
3330           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3331                                                                             \
3332   develop_pd(intx, CodeEntryAlignment,                                      \
3333           "Code entry alignment for generated code (in bytes)")             \
3334           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3335                                                                             \
3336   product_pd(intx, OptoLoopAlignment,                                       \
3337           "Align inner loops to zero relative to this modulus")             \
3338           range(1, 16)                                                      \
3339           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3340                                                                             \
3341   product_pd(uintx, InitialCodeCacheSize,                                   \
3342           "Initial code cache size (in bytes)")                             \
3343           range(0, max_uintx)                                               \
3344                                                                             \
3345   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3346           "Minimum code cache size (in bytes) required to start VM.")       \
3347           range(0, max_uintx)                                               \
3348                                                                             \
3349   product(bool, SegmentedCodeCache, false,                                  \
3350           "Use a segmented code cache")                                     \
3351                                                                             \
3352   product_pd(uintx, ReservedCodeCacheSize,                                  \
3353           "Reserved code cache size (in bytes) - maximum code cache size")  \
3354           range(0, max_uintx)                                               \
3355                                                                             \
3356   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3357           "Size of code heap with non-profiled methods (in bytes)")         \
3358           range(0, max_uintx)                                               \
3359                                                                             \
3360   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3361           "Size of code heap with profiled methods (in bytes)")             \
3362           range(0, max_uintx)                                               \
3363                                                                             \
3364   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3365           "Size of code heap with non-nmethods (in bytes)")                 \
3366           range(0, max_uintx)                                               \
3367                                                                             \
3368   product_pd(uintx, CodeCacheExpansionSize,                                 \
3369           "Code cache expansion size (in bytes)")                           \
3370           range(0, max_uintx)                                               \
3371                                                                             \
3372   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3373           "Minimum number of segments in a code cache block")               \
3374           range(1, 100)                                                     \
3375                                                                             \
3376   notproduct(bool, ExitOnFullCodeCache, false,                              \
3377           "Exit the VM if we fill the code cache")                          \
3378                                                                             \
3379   product(bool, UseCodeCacheFlushing, true,                                 \
3380           "Remove cold/old nmethods from the code cache")                   \
3381                                                                             \
3382   product(uintx, StartAggressiveSweepingAt, 10,                             \
3383           "Start aggressive sweeping if X[%] of the code cache is free."    \
3384           "Segmented code cache: X[%] of the non-profiled heap."            \
3385           "Non-segmented code cache: X[%] of the total code cache")         \
3386           range(0, 100)                                                     \
3387                                                                             \
3388   /* interpreter debugging */                                               \
3389   develop(intx, BinarySwitchThreshold, 5,                                   \
3390           "Minimal number of lookupswitch entries for rewriting to binary " \
3391           "switch")                                                         \
3392                                                                             \
3393   develop(intx, StopInterpreterAt, 0,                                       \
3394           "Stop interpreter execution at specified bytecode number")        \
3395                                                                             \
3396   develop(intx, TraceBytecodesAt, 0,                                        \
3397           "Trace bytecodes starting with specified bytecode number")        \
3398                                                                             \
3399   /* compiler interface */                                                  \
3400   develop(intx, CIStart, 0,                                                 \
3401           "The id of the first compilation to permit")                      \
3402                                                                             \
3403   develop(intx, CIStop, max_jint,                                           \
3404           "The id of the last compilation to permit")                       \
3405                                                                             \
3406   develop(intx, CIStartOSR, 0,                                              \
3407           "The id of the first osr compilation to permit "                  \
3408           "(CICountOSR must be on)")                                        \
3409                                                                             \
3410   develop(intx, CIStopOSR, max_jint,                                        \
3411           "The id of the last osr compilation to permit "                   \
3412           "(CICountOSR must be on)")                                        \
3413                                                                             \
3414   develop(intx, CIBreakAtOSR, -1,                                           \
3415           "The id of osr compilation to break at")                          \
3416                                                                             \
3417   develop(intx, CIBreakAt, -1,                                              \
3418           "The id of compilation to break at")                              \
3419                                                                             \
3420   product(ccstrlist, CompileOnly, "",                                       \
3421           "List of methods (pkg/class.name) to restrict compilation to")    \
3422                                                                             \
3423   product(ccstr, CompileCommandFile, NULL,                                  \
3424           "Read compiler commands from this file [.hotspot_compiler]")      \
3425                                                                             \
3426   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3427           "Read compiler directives from this file")                        \
3428                                                                             \
3429   product(ccstrlist, CompileCommand, "",                                    \
3430           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3431                                                                             \
3432   develop(bool, ReplayCompiles, false,                                      \
3433           "Enable replay of compilations from ReplayDataFile")              \
3434                                                                             \
3435   product(ccstr, ReplayDataFile, NULL,                                      \
3436           "File containing compilation replay information"                  \
3437           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3438                                                                             \
3439    product(ccstr, InlineDataFile, NULL,                                     \
3440           "File containing inlining replay information"                     \
3441           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3442                                                                             \
3443   develop(intx, ReplaySuppressInitializers, 2,                              \
3444           "Control handling of class initialization during replay: "        \
3445           "0 - don't do anything special; "                                 \
3446           "1 - treat all class initializers as empty; "                     \
3447           "2 - treat class initializers for application classes as empty; " \
3448           "3 - allow all class initializers to run during bootstrap but "   \
3449           "    pretend they are empty after starting replay")               \
3450           range(0, 3)                                                       \
3451                                                                             \
3452   develop(bool, ReplayIgnoreInitErrors, false,                              \
3453           "Ignore exceptions thrown during initialization for replay")      \
3454                                                                             \
3455   product(bool, DumpReplayDataOnError, true,                                \
3456           "Record replay data for crashing compiler threads")               \
3457                                                                             \
3458   product(bool, CICompilerCountPerCPU, false,                               \
3459           "1 compiler thread for log(N CPUs)")                              \
3460                                                                             \
3461   develop(intx, CIFireOOMAt,    -1,                                         \
3462           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3463           "(non-negative value throws OOM after this many CI accesses "     \
3464           "in each compile)")                                               \
3465   notproduct(intx, CICrashAt, -1,                                           \
3466           "id of compilation to trigger assert in compiler thread for "     \
3467           "the purpose of testing, e.g. generation of replay data")         \
3468   notproduct(bool, CIObjectFactoryVerify, false,                            \
3469           "enable potentially expensive verification in ciObjectFactory")   \
3470                                                                             \
3471   /* Priorities */                                                          \
3472   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3473                                                                             \
3474   product(intx, ThreadPriorityPolicy, 0,                                    \
3475           "0 : Normal.                                                     "\
3476           "    VM chooses priorities that are appropriate for normal       "\
3477           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3478           "    to normal native priority. Java priorities below "           \
3479           "    NORM_PRIORITY map to lower native priority values. On       "\
3480           "    Windows applications are allowed to use higher native       "\
3481           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3482           "    not use the highest possible native priority,               "\
3483           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3484           "    system threads. On Linux thread priorities are ignored      "\
3485           "    because the OS does not support static priority in          "\
3486           "    SCHED_OTHER scheduling class which is the only choice for   "\
3487           "    non-root, non-realtime applications.                        "\
3488           "1 : Aggressive.                                                 "\
3489           "    Java thread priorities map over to the entire range of      "\
3490           "    native thread priorities. Higher Java thread priorities map "\
3491           "    to higher native thread priorities. This policy should be   "\
3492           "    used with care, as sometimes it can cause performance       "\
3493           "    degradation in the application and/or the entire system. On "\
3494           "    Linux this policy requires root privilege.")                 \
3495           range(0, 1)                                                       \
3496                                                                             \
3497   product(bool, ThreadPriorityVerbose, false,                               \
3498           "Print priority changes")                                         \
3499                                                                             \
3500   product(intx, CompilerThreadPriority, -1,                                 \
3501           "The native priority at which compiler threads should run "       \
3502           "(-1 means no change)")                                           \
3503           range(min_jint, max_jint)                                         \
3504           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3505                                                                             \
3506   product(intx, VMThreadPriority, -1,                                       \
3507           "The native priority at which the VM thread should run "          \
3508           "(-1 means no change)")                                           \
3509           range(-1, 127)                                                    \
3510                                                                             \
3511   product(bool, CompilerThreadHintNoPreempt, true,                          \
3512           "(Solaris only) Give compiler threads an extra quanta")           \
3513                                                                             \
3514   product(bool, VMThreadHintNoPreempt, false,                               \
3515           "(Solaris only) Give VM thread an extra quanta")                  \
3516                                                                             \
3517   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3518           "Map Java priorities to OS priorities")                           \
3519           range(-1, 127)                                                    \
3520                                                                             \
3521   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3522           "Map Java priorities to OS priorities")                           \
3523           range(-1, 127)                                                    \
3524                                                                             \
3525   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3526           "Map Java priorities to OS priorities")                           \
3527           range(-1, 127)                                                    \
3528                                                                             \
3529   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3530           "Map Java priorities to OS priorities")                           \
3531           range(-1, 127)                                                    \
3532                                                                             \
3533   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3534           "Map Java priorities to OS priorities")                           \
3535           range(-1, 127)                                                    \
3536                                                                             \
3537   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3538           "Map Java priorities to OS priorities")                           \
3539           range(-1, 127)                                                    \
3540                                                                             \
3541   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3542           "Map Java priorities to OS priorities")                           \
3543           range(-1, 127)                                                    \
3544                                                                             \
3545   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3546           "Map Java priorities to OS priorities")                           \
3547           range(-1, 127)                                                    \
3548                                                                             \
3549   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3550           "Map Java priorities to OS priorities")                           \
3551           range(-1, 127)                                                    \
3552                                                                             \
3553   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3554           "Map Java priorities to OS priorities")                           \
3555           range(-1, 127)                                                    \
3556                                                                             \
3557   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3558           "Java thread priority 10 maps to critical scheduling priority")   \
3559                                                                             \
3560   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3561           "Compiler thread(s) run at critical scheduling priority")         \
3562                                                                             \
3563   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3564           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3565                                                                             \
3566   /* compiler debugging */                                                  \
3567   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3568           "First class to consider when using +CompileTheWorld")            \
3569                                                                             \
3570   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3571           "Last class to consider when using +CompileTheWorld")             \
3572                                                                             \
3573   develop(intx, NewCodeParameter,      0,                                   \
3574           "Testing Only: Create a dedicated integer parameter before "      \
3575           "putback")                                                        \
3576                                                                             \
3577   /* new oopmap storage allocation */                                       \
3578   develop(intx, MinOopMapAllocation,     8,                                 \
3579           "Minimum number of OopMap entries in an OopMapSet")               \
3580                                                                             \
3581   /* Background Compilation */                                              \
3582   develop(intx, LongCompileThreshold,     50,                               \
3583           "Used with +TraceLongCompiles")                                   \
3584                                                                             \
3585   /* recompilation */                                                       \
3586   product_pd(intx, CompileThreshold,                                        \
3587           "number of interpreted method invocations before (re-)compiling") \
3588           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3589                                                                             \
3590   product(double, CompileThresholdScaling, 1.0,                             \
3591           "Factor to control when first compilation happens "               \
3592           "(both with and without tiered compilation): "                    \
3593           "values greater than 1.0 delay counter overflow, "                \
3594           "values between 0 and 1.0 rush counter overflow, "                \
3595           "value of 1.0 leaves compilation thresholds unchanged "           \
3596           "value of 0.0 is equivalent to -Xint. "                           \
3597           ""                                                                \
3598           "Flag can be set as per-method option. "                          \
3599           "If a value is specified for a method, compilation thresholds "   \
3600           "for that method are scaled by both the value of the global flag "\
3601           "and the value of the per-method flag.")                          \
3602           range(0.0, DBL_MAX)                                               \
3603                                                                             \
3604   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3605           "Interpreter (tier 0) invocation notification frequency")         \
3606           range(0, 30)                                                      \
3607                                                                             \
3608   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3609           "C1 without MDO (tier 2) invocation notification frequency")      \
3610           range(0, 30)                                                      \
3611                                                                             \
3612   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3613           "C1 with MDO profiling (tier 3) invocation notification "         \
3614           "frequency")                                                      \
3615           range(0, 30)                                                      \
3616                                                                             \
3617   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3618           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3619           range(0, 30)                                                      \
3620                                                                             \
3621   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3622           "Interpreter (tier 0) invocation notification frequency")         \
3623           range(0, 30)                                                      \
3624                                                                             \
3625   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3626           "C1 without MDO (tier 2) invocation notification frequency")      \
3627           range(0, 30)                                                      \
3628                                                                             \
3629   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3630           "C1 with MDO profiling (tier 3) invocation notification "         \
3631           "frequency")                                                      \
3632           range(0, 30)                                                      \
3633                                                                             \
3634   product(intx, Tier2CompileThreshold, 0,                                   \
3635           "threshold at which tier 2 compilation is invoked")               \
3636           range(0, max_jint)                                                \
3637                                                                             \
3638   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3639           "Back edge threshold at which tier 2 compilation is invoked")     \
3640           range(0, max_jint)                                                \
3641                                                                             \
3642   product(intx, Tier3InvocationThreshold, 200,                              \
3643           "Compile if number of method invocations crosses this "           \
3644           "threshold")                                                      \
3645           range(0, max_jint)                                                \
3646                                                                             \
3647   product(intx, Tier3MinInvocationThreshold, 100,                           \
3648           "Minimum invocation to compile at tier 3")                        \
3649           range(0, max_jint)                                                \
3650                                                                             \
3651   product(intx, Tier3CompileThreshold, 2000,                                \
3652           "Threshold at which tier 3 compilation is invoked (invocation "   \
3653           "minimum must be satisfied)")                                     \
3654           range(0, max_jint)                                                \
3655                                                                             \
3656   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3657           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3658           range(0, max_jint)                                                \
3659                                                                             \
3660   product(intx, Tier4InvocationThreshold, 5000,                             \
3661           "Compile if number of method invocations crosses this "           \
3662           "threshold")                                                      \
3663           range(0, max_jint)                                                \
3664                                                                             \
3665   product(intx, Tier4MinInvocationThreshold, 600,                           \
3666           "Minimum invocation to compile at tier 4")                        \
3667           range(0, max_jint)                                                \
3668                                                                             \
3669   product(intx, Tier4CompileThreshold, 15000,                               \
3670           "Threshold at which tier 4 compilation is invoked (invocation "   \
3671           "minimum must be satisfied")                                      \
3672           range(0, max_jint)                                                \
3673                                                                             \
3674   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3675           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3676           range(0, max_jint)                                                \
3677                                                                             \
3678   product(intx, Tier3DelayOn, 5,                                            \
3679           "If C2 queue size grows over this amount per compiler thread "    \
3680           "stop compiling at tier 3 and start compiling at tier 2")         \
3681           range(0, max_jint)                                                \
3682                                                                             \
3683   product(intx, Tier3DelayOff, 2,                                           \
3684           "If C2 queue size is less than this amount per compiler thread "  \
3685           "allow methods compiled at tier 2 transition to tier 3")          \
3686           range(0, max_jint)                                                \
3687                                                                             \
3688   product(intx, Tier3LoadFeedback, 5,                                       \
3689           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3690           "reaches this amount per compiler thread")                        \
3691           range(0, max_jint)                                                \
3692                                                                             \
3693   product(intx, Tier4LoadFeedback, 3,                                       \
3694           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3695           "reaches this amount per compiler thread")                        \
3696           range(0, max_jint)                                                \
3697                                                                             \
3698   product(intx, TieredCompileTaskTimeout, 50,                               \
3699           "Kill compile task if method was not used within "                \
3700           "given timeout in milliseconds")                                  \
3701           range(0, max_intx)                                                \
3702                                                                             \
3703   product(intx, TieredStopAtLevel, 4,                                       \
3704           "Stop at given compilation level")                                \
3705           range(0, 4)                                                       \
3706                                                                             \
3707   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3708           "Start profiling in interpreter if the counters exceed tier 3 "   \
3709           "thresholds by the specified percentage")                         \
3710           range(0, max_jint)                                                \
3711                                                                             \
3712   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3713           "Increase the compile threshold for C1 compilation if the code "  \
3714           "cache is filled by the specified percentage")                    \
3715           range(0, 99)                                                      \
3716                                                                             \
3717   product(intx, TieredRateUpdateMinTime, 1,                                 \
3718           "Minimum rate sampling interval (in milliseconds)")               \
3719           range(0, max_intx)                                                \
3720                                                                             \
3721   product(intx, TieredRateUpdateMaxTime, 25,                                \
3722           "Maximum rate sampling interval (in milliseconds)")               \
3723           range(0, max_intx)                                                \
3724                                                                             \
3725   product_pd(bool, TieredCompilation,                                       \
3726           "Enable tiered compilation")                                      \
3727                                                                             \
3728   product(bool, PrintTieredEvents, false,                                   \
3729           "Print tiered events notifications")                              \
3730                                                                             \
3731   product_pd(intx, OnStackReplacePercentage,                                \
3732           "NON_TIERED number of method invocations/branches (expressed as " \
3733           "% of CompileThreshold) before (re-)compiling OSR code")          \
3734           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3735                                                                             \
3736   product(intx, InterpreterProfilePercentage, 33,                           \
3737           "NON_TIERED number of method invocations/branches (expressed as " \
3738           "% of CompileThreshold) before profiling in the interpreter")     \
3739           range(0, 100)                                                     \
3740                                                                             \
3741   develop(intx, MaxRecompilationSearchLength,    10,                        \
3742           "The maximum number of frames to inspect when searching for "     \
3743           "recompilee")                                                     \
3744                                                                             \
3745   develop(intx, MaxInterpretedSearchLength,     3,                          \
3746           "The maximum number of interpreted frames to skip when searching "\
3747           "for recompilee")                                                 \
3748                                                                             \
3749   develop(intx, DesiredMethodLimit,  8000,                                  \
3750           "The desired maximum method size (in bytecodes) after inlining")  \
3751                                                                             \
3752   develop(intx, HugeMethodLimit,  8000,                                     \
3753           "Don't compile methods larger than this if "                      \
3754           "+DontCompileHugeMethods")                                        \
3755                                                                             \
3756   /* New JDK 1.4 reflection implementation */                               \
3757                                                                             \
3758   develop(intx, FastSuperclassLimit, 8,                                     \
3759           "Depth of hardwired instanceof accelerator array")                \
3760                                                                             \
3761   /* Properties for Java libraries  */                                      \
3762                                                                             \
3763   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3764           "Maximum total size of NIO direct-buffer allocations")            \
3765           range(0, max_jlong)                                               \
3766                                                                             \
3767   /* Flags used for temporary code during development  */                   \
3768                                                                             \
3769   diagnostic(bool, UseNewCode, false,                                       \
3770           "Testing Only: Use the new version while testing")                \
3771                                                                             \
3772   diagnostic(bool, UseNewCode2, false,                                      \
3773           "Testing Only: Use the new version while testing")                \
3774                                                                             \
3775   diagnostic(bool, UseNewCode3, false,                                      \
3776           "Testing Only: Use the new version while testing")                \
3777                                                                             \
3778   /* flags for performance data collection */                               \
3779                                                                             \
3780   product(bool, UsePerfData, true,                                          \
3781           "Flag to disable jvmstat instrumentation for performance testing "\
3782           "and problem isolation purposes")                                 \
3783                                                                             \
3784   product(bool, PerfDataSaveToFile, false,                                  \
3785           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3786                                                                             \
3787   product(ccstr, PerfDataSaveFile, NULL,                                    \
3788           "Save PerfData memory to the specified absolute pathname. "       \
3789           "The string %p in the file name (if present) "                    \
3790           "will be replaced by pid")                                        \
3791                                                                             \
3792   product(intx, PerfDataSamplingInterval, 50,                               \
3793           "Data sampling interval (in milliseconds)")                       \
3794           range(PeriodicTask::min_interval, max_jint)                       \
3795           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3796                                                                             \
3797   develop(bool, PerfTraceDataCreation, false,                               \
3798           "Trace creation of Performance Data Entries")                     \
3799                                                                             \
3800   develop(bool, PerfTraceMemOps, false,                                     \
3801           "Trace PerfMemory create/attach/detach calls")                    \
3802                                                                             \
3803   product(bool, PerfDisableSharedMem, false,                                \
3804           "Store performance data in standard memory")                      \
3805                                                                             \
3806   product(intx, PerfDataMemorySize, 32*K,                                   \
3807           "Size of performance data memory region. Will be rounded "        \
3808           "up to a multiple of the native os page size.")                   \
3809           range(128, 32*64*K)                                               \
3810                                                                             \
3811   product(intx, PerfMaxStringConstLength, 1024,                             \
3812           "Maximum PerfStringConstant string length before truncation")     \
3813           range(32, 32*K)                                                   \
3814                                                                             \
3815   product(bool, PerfAllowAtExitRegistration, false,                         \
3816           "Allow registration of atexit() methods")                         \
3817                                                                             \
3818   product(bool, PerfBypassFileSystemCheck, false,                           \
3819           "Bypass Win32 file system criteria checks (Windows Only)")        \
3820                                                                             \
3821   product(intx, UnguardOnExecutionViolation, 0,                             \
3822           "Unguard page and retry on no-execute fault (Win32 only) "        \
3823           "0=off, 1=conservative, 2=aggressive")                            \
3824           range(0, 2)                                                       \
3825                                                                             \
3826   /* Serviceability Support */                                              \
3827                                                                             \
3828   product(bool, ManagementServer, false,                                    \
3829           "Create JMX Management Server")                                   \
3830                                                                             \
3831   product(bool, DisableAttachMechanism, false,                              \
3832           "Disable mechanism that allows tools to attach to this VM")       \
3833                                                                             \
3834   product(bool, StartAttachListener, false,                                 \
3835           "Always start Attach Listener at VM startup")                     \
3836                                                                             \
3837   manageable(bool, PrintConcurrentLocks, false,                             \
3838           "Print java.util.concurrent locks in thread dump")                \
3839                                                                             \
3840   product(bool, TransmitErrorReport, false,                                 \
3841           "Enable error report transmission on erroneous termination")      \
3842                                                                             \
3843   product(ccstr, ErrorReportServer, NULL,                                   \
3844           "Override built-in error report server address")                  \
3845                                                                             \
3846   /* Shared spaces */                                                       \
3847                                                                             \
3848   product(bool, UseSharedSpaces, true,                                      \
3849           "Use shared spaces for metadata")                                 \
3850                                                                             \
3851   product(bool, VerifySharedSpaces, false,                                  \
3852           "Verify shared spaces (false for default archive, true for "      \
3853           "archive specified by -XX:SharedArchiveFile)")                    \
3854                                                                             \
3855   product(bool, RequireSharedSpaces, false,                                 \
3856           "Require shared spaces for metadata")                             \
3857                                                                             \
3858   product(bool, DumpSharedSpaces, false,                                    \
3859           "Special mode: JVM reads a class list, loads classes, builds "    \
3860           "shared spaces, and dumps the shared spaces to a file to be "     \
3861           "used in future JVM runs")                                        \
3862                                                                             \
3863   product(bool, PrintSharedSpaces, false,                                   \
3864           "Print usage of shared spaces")                                   \
3865                                                                             \
3866   product(bool, PrintSharedArchiveAndExit, false,                           \
3867           "Print shared archive file contents")                             \
3868                                                                             \
3869   product(bool, PrintSharedDictionary, false,                               \
3870           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3871           "dictionary")                                                     \
3872                                                                             \
3873   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3874           "Size of read-write space for metadata (in bytes)")               \
3875           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3876           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3877                                                                             \
3878   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3879           "Size of read-only space for metadata (in bytes)")                \
3880           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3881           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3882                                                                             \
3883   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3884           "Size of the shared miscellaneous data area (in bytes)")          \
3885           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3886           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3887                                                                             \
3888   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3889           "Size of the shared miscellaneous code area (in bytes)")          \
3890           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3891           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3892                                                                             \
3893   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3894           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3895           "Address to allocate shared memory region for class data")        \
3896           range(0, SIZE_MAX)                                                \
3897                                                                             \
3898   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3899           "Average number of symbols per bucket in shared table")           \
3900           range(2, 246)                                                     \
3901                                                                             \
3902   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3903           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3904           "classes. Just exclude them from the shared dictionary.")         \
3905                                                                             \
3906   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3907           "Print generated stub code for method handles")                   \
3908                                                                             \
3909   develop(bool, TraceMethodHandles, false,                                  \
3910           "trace internal method handle operations")                        \
3911                                                                             \
3912   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3913           "perform extra checks when constructing method handles")          \
3914                                                                             \
3915   diagnostic(bool, ShowHiddenFrames, false,                                 \
3916           "show method handle implementation frames (usually hidden)")      \
3917                                                                             \
3918   experimental(bool, TrustFinalNonStaticFields, false,                      \
3919           "trust final non-static declarations for constant folding")       \
3920                                                                             \
3921   diagnostic(bool, FoldStableValues, true,                                  \
3922           "Optimize loads from stable fields (marked w/ @Stable)")          \
3923                                                                             \
3924   develop(bool, TraceInvokeDynamic, false,                                  \
3925           "trace internal invoke dynamic operations")                       \
3926                                                                             \
3927   diagnostic(bool, PauseAtStartup,      false,                              \
3928           "Causes the VM to pause at startup time and wait for the pause "  \
3929           "file to be removed (default: ./vm.paused.<pid>)")                \
3930                                                                             \
3931   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3932           "The file to create and for whose removal to await when pausing " \
3933           "at startup. (default: ./vm.paused.<pid>)")                       \
3934                                                                             \
3935   diagnostic(bool, PauseAtExit, false,                                      \
3936           "Pause and wait for keypress on exit if a debugger is attached")  \
3937                                                                             \
3938   product(bool, ExtendedDTraceProbes,    false,                             \
3939           "Enable performance-impacting dtrace probes")                     \
3940                                                                             \
3941   product(bool, DTraceMethodProbes, false,                                  \
3942           "Enable dtrace probes for method-entry and method-exit")          \
3943                                                                             \
3944   product(bool, DTraceAllocProbes, false,                                   \
3945           "Enable dtrace probes for object allocation")                     \
3946                                                                             \
3947   product(bool, DTraceMonitorProbes, false,                                 \
3948           "Enable dtrace probes for monitor events")                        \
3949                                                                             \
3950   product(bool, RelaxAccessControlCheck, false,                             \
3951           "Relax the access control checks in the verifier")                \
3952                                                                             \
3953   product(uintx, StringTableSize, defaultStringTableSize,                   \
3954           "Number of buckets in the interned String table")                 \
3955           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3956                                                                             \
3957   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3958           "Number of buckets in the JVM internal Symbol table")             \
3959           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3960                                                                             \
3961   product(bool, UseStringDeduplication, false,                              \
3962           "Use string deduplication")                                       \
3963                                                                             \
3964   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3965           "A string must reach this age (or be promoted to an old region) " \
3966           "to be considered for deduplication")                             \
3967           range(1, markOopDesc::max_age)                                    \
3968                                                                             \
3969   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3970           "Force table resize every time the table is scanned")             \
3971                                                                             \
3972   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3973           "Force table rehash every time the table is scanned")             \
3974                                                                             \
3975   diagnostic(bool, WhiteBoxAPI, false,                                      \
3976           "Enable internal testing APIs")                                   \
3977                                                                             \
3978   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3979            "Default survivor space alignment in bytes")                     \
3980            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
3981                                                                             \
3982   product(bool , AllowNonVirtualCalls, false,                               \
3983           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3984                                                                             \
3985   product(ccstr, DumpLoadedClassList, NULL,                                 \
3986           "Dump the names all loaded classes, that could be stored into "   \
3987           "the CDS archive, in the specified file")                         \
3988                                                                             \
3989   product(ccstr, SharedClassListFile, NULL,                                 \
3990           "Override the default CDS class list")                            \
3991                                                                             \
3992   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3993           "Override the default location of the CDS archive file")          \
3994                                                                             \
3995   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3996           "Extra classlist for building the CDS archive file")              \
3997                                                                             \
3998   experimental(size_t, ArrayAllocatorMallocLimit,                           \
3999           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4000           "Allocation less than this value will be allocated "              \
4001           "using malloc. Larger allocations will use mmap.")                \
4002                                                                             \
4003   experimental(bool, AlwaysAtomicAccesses, false,                           \
4004           "Accesses to all variables should always be atomic")              \
4005                                                                             \
4006   product(bool, EnableTracing, false,                                       \
4007           "Enable event-based tracing")                                     \
4008                                                                             \
4009   product(bool, UseLockedTracing, false,                                    \
4010           "Use locked-tracing when doing event-based tracing")              \
4011                                                                             \
4012   diagnostic(bool, UseUnalignedAccesses, false,                             \
4013           "Use unaligned memory accesses in Unsafe")                        \
4014                                                                             \
4015   product_pd(bool, PreserveFramePointer,                                    \
4016              "Use the FP register for holding the frame pointer "           \
4017              "and not as a general purpose register.")                      \
4018                                                                             \
4019   diagnostic(bool, CheckIntrinsics, true,                                   \
4020              "When a class C is loaded, check that "                        \
4021              "(1) all intrinsics defined by the VM for class C are present "\
4022              "in the loaded class file and are marked with the "            \
4023              "@HotSpotIntrinsicCandidate annotation, that "                 \
4024              "(2) there is an intrinsic registered for all loaded methods " \
4025              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4026              "annotation, and that "                                        \
4027              "(3) no orphan methods exist for class C (i.e., methods for "  \
4028              "which the VM declares an intrinsic but that are not declared "\
4029              "in the loaded class C. "                                      \
4030              "Check (3) is available only in debug builds.")                \
4031                                                                             \
4032   diagnostic_pd(intx, InitArrayShortSize,                                   \
4033           "Threshold small size (in bytes) for clearing arrays. "           \
4034           "Anything this size or smaller may get converted to discrete "    \
4035           "scalar stores.")                                                 \
4036           range(0, max_intx)                                                \
4037           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4038                                                                             \
4039   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4040              "Disable backwards compatibility for compile commands.")       \
4041                                                                             \
4042   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4043              "Print compiler directives on installation.")                  \
4044   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4045              "Limit on number of compiler directives.")
4046 
4047 
4048 /*
4049  *  Macros for factoring of globals
4050  */
4051 
4052 // Interface macros
4053 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4054 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4055 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4056 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4057 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4058 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4059 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4060 #ifdef PRODUCT
4061 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4062 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4063 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4064 #else
4065 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4066 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4067 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4068 #endif // PRODUCT
4069 // Special LP64 flags, product only needed for now.
4070 #ifdef _LP64
4071 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4072 #else
4073 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4074 #endif // _LP64
4075 
4076 // Implementation macros
4077 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4078 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4079 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4080 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4081 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4082 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4083 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4084 #ifdef PRODUCT
4085 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4086 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4087 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4088 #else
4089 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4090 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4091 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4092 #endif // PRODUCT
4093 #ifdef _LP64
4094 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4095 #else
4096 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4097 #endif // _LP64
4098 
4099 // Only materialize src code for range checking when required, ignore otherwise
4100 #define IGNORE_RANGE(a, b)
4101 // Only materialize src code for contraint checking when required, ignore otherwise
4102 #define IGNORE_CONSTRAINT(func,type)
4103 
4104 #define IGNORE_WRITEABLE(type)
4105 
4106 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4107               DECLARE_PD_DEVELOPER_FLAG, \
4108               DECLARE_PRODUCT_FLAG, \
4109               DECLARE_PD_PRODUCT_FLAG, \
4110               DECLARE_DIAGNOSTIC_FLAG, \
4111               DECLARE_PD_DIAGNOSTIC_FLAG, \
4112               DECLARE_EXPERIMENTAL_FLAG, \
4113               DECLARE_NOTPRODUCT_FLAG, \
4114               DECLARE_MANAGEABLE_FLAG, \
4115               DECLARE_PRODUCT_RW_FLAG, \
4116               DECLARE_LP64_PRODUCT_FLAG, \
4117               IGNORE_RANGE, \
4118               IGNORE_CONSTRAINT, \
4119               IGNORE_WRITEABLE)
4120 
4121 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4122                  DECLARE_PD_DEVELOPER_FLAG, \
4123                  DECLARE_PRODUCT_FLAG, \
4124                  DECLARE_PD_PRODUCT_FLAG, \
4125                  DECLARE_DIAGNOSTIC_FLAG, \
4126                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4127                  DECLARE_NOTPRODUCT_FLAG, \
4128                  IGNORE_RANGE, \
4129                  IGNORE_CONSTRAINT, \
4130                  IGNORE_WRITEABLE)
4131 
4132 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4133            DECLARE_PRODUCT_FLAG, \
4134            DECLARE_DIAGNOSTIC_FLAG, \
4135            DECLARE_EXPERIMENTAL_FLAG, \
4136            DECLARE_NOTPRODUCT_FLAG, \
4137            IGNORE_RANGE, \
4138            IGNORE_CONSTRAINT, \
4139            IGNORE_WRITEABLE)
4140 
4141 // Extensions
4142 
4143 #include "runtime/globals_ext.hpp"
4144 
4145 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP