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