1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/globalDefinitions.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   size_t _name_len;
 190 
 191   // points to all Flags static array
 192   static Flag* flags;
 193 
 194   // number of flags
 195   static size_t numFlags;
 196 
 197   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 198   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 199   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 200 
 201   static const char* get_int_default_range_str();
 202   static const char* get_uint_default_range_str();
 203   static const char* get_intx_default_range_str();
 204   static const char* get_uintx_default_range_str();
 205   static const char* get_uint64_t_default_range_str();
 206   static const char* get_size_t_default_range_str();
 207   static const char* get_double_default_range_str();
 208 
 209   Flag::Error check_writable(bool changed);
 210 
 211   bool is_bool() const;
 212   bool get_bool() const;
 213   Flag::Error set_bool(bool value);
 214 
 215   bool is_int() const;
 216   int get_int() const;
 217   Flag::Error set_int(int value);
 218 
 219   bool is_uint() const;
 220   uint get_uint() const;
 221   Flag::Error set_uint(uint value);
 222 
 223   bool is_intx() const;
 224   intx get_intx() const;
 225   Flag::Error set_intx(intx value);
 226 
 227   bool is_uintx() const;
 228   uintx get_uintx() const;
 229   Flag::Error set_uintx(uintx value);
 230 
 231   bool is_uint64_t() const;
 232   uint64_t get_uint64_t() const;
 233   Flag::Error set_uint64_t(uint64_t value);
 234 
 235   bool is_size_t() const;
 236   size_t get_size_t() const;
 237   Flag::Error set_size_t(size_t value);
 238 
 239   bool is_double() const;
 240   double get_double() const;
 241   Flag::Error set_double(double value);
 242 
 243   bool is_ccstr() const;
 244   bool ccstr_accumulates() const;
 245   ccstr get_ccstr() const;
 246   Flag::Error set_ccstr(ccstr value);
 247 
 248   Flags get_origin();
 249   void set_origin(Flags origin);
 250 
 251   size_t get_name_length();
 252 
 253   bool is_default();
 254   bool is_ergonomic();
 255   bool is_command_line();
 256   void set_command_line();
 257 
 258   bool is_product() const;
 259   bool is_manageable() const;
 260   bool is_diagnostic() const;
 261   bool is_experimental() const;
 262   bool is_notproduct() const;
 263   bool is_develop() const;
 264   bool is_read_write() const;
 265   bool is_commercial() const;
 266 
 267   bool is_constant_in_binary() const;
 268 
 269   bool is_unlocker() const;
 270   bool is_unlocked() const;
 271   bool is_writeable() const;
 272   bool is_external() const;
 273 
 274   bool is_unlocker_ext() const;
 275   bool is_unlocked_ext() const;
 276   bool is_writeable_ext() const;
 277   bool is_external_ext() const;
 278 
 279   void clear_diagnostic();
 280 
 281   Flag::MsgType get_locked_message(char*, int) const;
 282   void get_locked_message_ext(char*, int) const;
 283 
 284   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 285   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 286   void print_kind_and_origin(outputStream* st);
 287   void print_as_flag(outputStream* st);
 288 
 289   static const char* flag_error_str(Flag::Error error);
 290 };
 291 
 292 // debug flags control various aspects of the VM and are global accessible
 293 
 294 // use FlagSetting to temporarily change some debug flag
 295 // e.g. FlagSetting fs(DebugThisAndThat, true);
 296 // restored to previous value upon leaving scope
 297 class FlagSetting {
 298   bool val;
 299   bool* flag;
 300  public:
 301   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 302   ~FlagSetting()                       { *flag = val; }
 303 };
 304 
 305 
 306 class CounterSetting {
 307   intx* counter;
 308  public:
 309   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 310   ~CounterSetting()         { (*counter)--; }
 311 };
 312 
 313 class IntFlagSetting {
 314   int val;
 315   int* flag;
 316  public:
 317   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 318   ~IntFlagSetting()                     { *flag = val; }
 319 };
 320 
 321 class UIntFlagSetting {
 322   uint val;
 323   uint* flag;
 324  public:
 325   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 326   ~UIntFlagSetting()                       { *flag = val; }
 327 };
 328 
 329 class UIntXFlagSetting {
 330   uintx val;
 331   uintx* flag;
 332  public:
 333   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 334   ~UIntXFlagSetting()                         { *flag = val; }
 335 };
 336 
 337 class DoubleFlagSetting {
 338   double val;
 339   double* flag;
 340  public:
 341   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 342   ~DoubleFlagSetting()                           { *flag = val; }
 343 };
 344 
 345 class SizeTFlagSetting {
 346   size_t val;
 347   size_t* flag;
 348  public:
 349   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 350   ~SizeTFlagSetting()                           { *flag = val; }
 351 };
 352 
 353 // Helper class for temporarily saving the value of a flag during a scope.
 354 template <size_t SIZE>
 355 class FlagGuard {
 356   unsigned char _value[SIZE];
 357   void* const _addr;
 358 
 359   // Hide operator new, this class should only be allocated on the stack.
 360   // NOTE: Cannot include memory/allocation.hpp here due to circular
 361   //       dependencies.
 362   void* operator new(size_t size) throw();
 363   void* operator new [](size_t size) throw();
 364 
 365  public:
 366   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 367     memcpy(_value, _addr, SIZE);
 368   }
 369 
 370   ~FlagGuard() {
 371     memcpy(_addr, _value, SIZE);
 372   }
 373 };
 374 
 375 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 376 
 377 class CommandLineFlags {
 378 public:
 379   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 380   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); }
 381   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 382   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 383   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 384 
 385   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 386   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); }
 387   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 388   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 389   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 390 
 391   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 392   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); }
 393   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 394   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 395   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 396 
 397   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 398   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); }
 399   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 400   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 401   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 402 
 403   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 404   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); }
 405   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 406   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 407   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 408 
 409   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 410   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); }
 411   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 412   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 413   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 414 
 415   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 416   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); }
 417   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 418   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 419   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 420 
 421   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 422   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); }
 423   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 424   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 425   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 426 
 427   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 428   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); }
 429   // Contract:  Flag will make private copy of the incoming value.
 430   // Outgoing value is always malloc-ed, and caller MUST call free.
 431   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 432   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 433 
 434   // Returns false if name is not a command line flag.
 435   static bool wasSetOnCmdline(const char* name, bool* value);
 436   static void printSetFlags(outputStream* out);
 437 
 438   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 439   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 440 
 441   static void verify() PRODUCT_RETURN;
 442 };
 443 
 444 // use this for flags that are true by default in the debug version but
 445 // false in the optimized version, and vice versa
 446 #ifdef ASSERT
 447 #define trueInDebug  true
 448 #define falseInDebug false
 449 #else
 450 #define trueInDebug  false
 451 #define falseInDebug true
 452 #endif
 453 
 454 // use this for flags that are true per default in the product build
 455 // but false in development builds, and vice versa
 456 #ifdef PRODUCT
 457 #define trueInProduct  true
 458 #define falseInProduct false
 459 #else
 460 #define trueInProduct  false
 461 #define falseInProduct true
 462 #endif
 463 
 464 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 465 // product flags are always settable / visible
 466 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 467 
 468 // A flag must be declared with one of the following types:
 469 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 470 // The type "ccstr" is an alias for "const char*" and is used
 471 // only in this file, because the macrology requires single-token type names.
 472 
 473 // Note: Diagnostic options not meant for VM tuning or for product modes.
 474 // They are to be used for VM quality assurance or field diagnosis
 475 // of VM bugs.  They are hidden so that users will not be encouraged to
 476 // try them as if they were VM ordinary execution options.  However, they
 477 // are available in the product version of the VM.  Under instruction
 478 // from support engineers, VM customers can turn them on to collect
 479 // diagnostic information about VM problems.  To use a VM diagnostic
 480 // option, you must first specify +UnlockDiagnosticVMOptions.
 481 // (This master switch also affects the behavior of -Xprintflags.)
 482 //
 483 // experimental flags are in support of features that are not
 484 //    part of the officially supported product, but are available
 485 //    for experimenting with. They could, for example, be performance
 486 //    features that may not have undergone full or rigorous QA, but which may
 487 //    help performance in some cases and released for experimentation
 488 //    by the community of users and developers. This flag also allows one to
 489 //    be able to build a fully supported product that nonetheless also
 490 //    ships with some unsupported, lightly tested, experimental features.
 491 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 492 //    UnlockExperimentalVMOptions flag, which allows the control and
 493 //    modification of the experimental flags.
 494 //
 495 // Nota bene: neither diagnostic nor experimental options should be used casually,
 496 //    and they are not supported on production loads, except under explicit
 497 //    direction from support engineers.
 498 //
 499 // manageable flags are writeable external product flags.
 500 //    They are dynamically writeable through the JDK management interface
 501 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 502 //    These flags are external exported interface (see CCC).  The list of
 503 //    manageable flags can be queried programmatically through the management
 504 //    interface.
 505 //
 506 //    A flag can be made as "manageable" only if
 507 //    - the flag is defined in a CCC as an external exported interface.
 508 //    - the VM implementation supports dynamic setting of the flag.
 509 //      This implies that the VM must *always* query the flag variable
 510 //      and not reuse state related to the flag state at any given time.
 511 //    - you want the flag to be queried programmatically by the customers.
 512 //
 513 // product_rw flags are writeable internal product flags.
 514 //    They are like "manageable" flags but for internal/private use.
 515 //    The list of product_rw flags are internal/private flags which
 516 //    may be changed/removed in a future release.  It can be set
 517 //    through the management interface to get/set value
 518 //    when the name of flag is supplied.
 519 //
 520 //    A flag can be made as "product_rw" only if
 521 //    - the VM implementation supports dynamic setting of the flag.
 522 //      This implies that the VM must *always* query the flag variable
 523 //      and not reuse state related to the flag state at any given time.
 524 //
 525 // Note that when there is a need to support develop flags to be writeable,
 526 // it can be done in the same way as product_rw.
 527 //
 528 // range is a macro that will expand to min and max arguments for range
 529 //    checking code if provided - see commandLineFlagRangeList.hpp
 530 //
 531 // constraint is a macro that will expand to custom function call
 532 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 533 //
 534 // writeable is a macro that controls if and how the value can change during the runtime
 535 //
 536 // writeable(Always) is optional and allows the flag to have its value changed
 537 //    without any limitations at any time
 538 //
 539 // writeable(Once) flag value's can be only set once during the lifetime of VM
 540 //
 541 // writeable(CommandLineOnly) flag value's can be only set from command line
 542 //    (multiple times allowed)
 543 //
 544 
 545 
 546 #define RUNTIME_FLAGS(develop, \
 547                       develop_pd, \
 548                       product, \
 549                       product_pd, \
 550                       diagnostic, \
 551                       diagnostic_pd, \
 552                       experimental, \
 553                       notproduct, \
 554                       manageable, \
 555                       product_rw, \
 556                       lp64_product, \
 557                       range, \
 558                       constraint, \
 559                       writeable) \
 560                                                                             \
 561   lp64_product(bool, UseCompressedOops, false,                              \
 562           "Use 32-bit object references in 64-bit VM. "                     \
 563           "lp64_product means flag is always constant in 32 bit VM")        \
 564                                                                             \
 565   lp64_product(bool, UseCompressedClassPointers, false,                     \
 566           "Use 32-bit class pointers in 64-bit VM. "                        \
 567           "lp64_product means flag is always constant in 32 bit VM")        \
 568                                                                             \
 569   notproduct(bool, CheckCompressedOops, true,                               \
 570           "Generate checks in encoding/decoding code in debug VM")          \
 571                                                                             \
 572   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 573           "Heap allocation steps through preferred address regions to find" \
 574           " where it can allocate the heap. Number of steps to take per "   \
 575           "region.")                                                        \
 576           range(1, max_uintx)                                               \
 577                                                                             \
 578   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 579           "Default object alignment in bytes, 8 is minimum")                \
 580           range(8, 256)                                                     \
 581           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 582                                                                             \
 583   product(bool, AssumeMP, false,                                            \
 584           "Instruct the VM to assume multiple processors are available")    \
 585                                                                             \
 586   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 587   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 588   /* been re-added (see 6401008)                                         */ \
 589   product_pd(bool, UseMembar,                                               \
 590           "(Unstable) Issues membars on thread state transitions")          \
 591                                                                             \
 592   develop(bool, CleanChunkPoolAsync, true,                                  \
 593           "Clean the chunk pool asynchronously")                            \
 594                                                                             \
 595   experimental(bool, AlwaysSafeConstructors, false,                         \
 596           "Force safe construction, as if all fields are final.")           \
 597                                                                             \
 598   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 599           "Enable normal processing of flags relating to field diagnostics")\
 600                                                                             \
 601   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 602           "Enable normal processing of flags relating to experimental "     \
 603           "features")                                                       \
 604                                                                             \
 605   product(bool, JavaMonitorsInStackTrace, true,                             \
 606           "Print information about Java monitor locks when the stacks are"  \
 607           "dumped")                                                         \
 608                                                                             \
 609   product_pd(bool, UseLargePages,                                           \
 610           "Use large page memory")                                          \
 611                                                                             \
 612   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 613           "Allocate large pages individually for better affinity")          \
 614                                                                             \
 615   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 616           "Fail large pages individual allocation")                         \
 617                                                                             \
 618   product(bool, UseLargePagesInMetaspace, false,                            \
 619           "Use large page memory in metaspace. "                            \
 620           "Only used if UseLargePages is enabled.")                         \
 621                                                                             \
 622   product(bool, UseNUMA, false,                                             \
 623           "Use NUMA if available")                                          \
 624                                                                             \
 625   product(bool, UseNUMAInterleaving, false,                                 \
 626           "Interleave memory across NUMA nodes if available")               \
 627                                                                             \
 628   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 629           "Granularity to use for NUMA interleaving on Windows OS")         \
 630           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 631                                                                             \
 632   product(bool, ForceNUMA, false,                                           \
 633           "Force NUMA optimizations on single-node/UMA systems")            \
 634                                                                             \
 635   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 636           "Percentage (0-100) used to weight the current sample when "      \
 637           "computing exponentially decaying average for "                   \
 638           "AdaptiveNUMAChunkSizing")                                        \
 639           range(0, 100)                                                     \
 640                                                                             \
 641   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 642           "Do not reallocate more than this amount per collection")         \
 643           range(0, max_uintx)                                               \
 644                                                                             \
 645   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 646           "Enable adaptive chunk sizing for NUMA")                          \
 647                                                                             \
 648   product(bool, NUMAStats, false,                                           \
 649           "Print NUMA stats in detailed heap information")                  \
 650                                                                             \
 651   product(uintx, NUMAPageScanRate, 256,                                     \
 652           "Maximum number of pages to include in the page scan procedure")  \
 653           range(0, max_uintx)                                               \
 654                                                                             \
 655   product_pd(bool, NeedsDeoptSuspend,                                       \
 656           "True for register window machines (sparc/ia64)")                 \
 657                                                                             \
 658   product(intx, UseSSE, 99,                                                 \
 659           "Highest supported SSE instructions set on x86/x64")              \
 660           range(0, 99)                                                      \
 661                                                                             \
 662   product(bool, UseAES, false,                                              \
 663           "Control whether AES instructions are used when available")       \
 664                                                                             \
 665   product(bool, UseFMA, false,                                              \
 666           "Control whether FMA instructions are used when available")       \
 667                                                                             \
 668   product(bool, UseSHA, false,                                              \
 669           "Control whether SHA instructions are used when available")       \
 670                                                                             \
 671   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 672           "Use intrinsics for GHASH versions of crypto")                    \
 673                                                                             \
 674   product(size_t, LargePageSizeInBytes, 0,                                  \
 675           "Large page size (0 to let VM choose the page size)")             \
 676           range(0, max_uintx)                                               \
 677                                                                             \
 678   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 679           "Use large pages if maximum heap is at least this big")           \
 680           range(0, max_uintx)                                               \
 681                                                                             \
 682   product(bool, ForceTimeHighResolution, false,                             \
 683           "Using high time resolution (for Win32 only)")                    \
 684                                                                             \
 685   develop(bool, TracePcPatching, false,                                     \
 686           "Trace usage of frame::patch_pc")                                 \
 687                                                                             \
 688   develop(bool, TraceRelocator, false,                                      \
 689           "Trace the bytecode relocator")                                   \
 690                                                                             \
 691   develop(bool, TraceLongCompiles, false,                                   \
 692           "Print out every time compilation is longer than "                \
 693           "a given threshold")                                              \
 694                                                                             \
 695   develop(bool, SafepointALot, false,                                       \
 696           "Generate a lot of safepoints. This works with "                  \
 697           "GuaranteedSafepointInterval")                                    \
 698                                                                             \
 699   product_pd(bool, BackgroundCompilation,                                   \
 700           "A thread requesting compilation is not blocked during "          \
 701           "compilation")                                                    \
 702                                                                             \
 703   product(bool, PrintVMQWaitTime, false,                                    \
 704           "Print out the waiting time in VM operation queue")               \
 705                                                                             \
 706   develop(bool, TraceOopMapGeneration, false,                               \
 707           "Show OopMapGeneration")                                          \
 708                                                                             \
 709   product(bool, MethodFlushing, true,                                       \
 710           "Reclamation of zombie and not-entrant methods")                  \
 711                                                                             \
 712   develop(bool, VerifyStack, false,                                         \
 713           "Verify stack of each thread when it is entering a runtime call") \
 714                                                                             \
 715   diagnostic(bool, ForceUnreachable, false,                                 \
 716           "Make all non code cache addresses to be unreachable by "         \
 717           "forcing use of 64bit literal fixups")                            \
 718                                                                             \
 719   notproduct(bool, StressDerivedPointers, false,                            \
 720           "Force scavenge when a derived pointer is detected on stack "     \
 721           "after rtm call")                                                 \
 722                                                                             \
 723   develop(bool, TraceDerivedPointers, false,                                \
 724           "Trace traversal of derived pointers on stack")                   \
 725                                                                             \
 726   notproduct(bool, TraceCodeBlobStacks, false,                              \
 727           "Trace stack-walk of codeblobs")                                  \
 728                                                                             \
 729   product(bool, PrintJNIResolving, false,                                   \
 730           "Used to implement -v:jni")                                       \
 731                                                                             \
 732   notproduct(bool, PrintRewrites, false,                                    \
 733           "Print methods that are being rewritten")                         \
 734                                                                             \
 735   product(bool, UseInlineCaches, true,                                      \
 736           "Use Inline Caches for virtual calls ")                           \
 737                                                                             \
 738   diagnostic(bool, InlineArrayCopy, true,                                   \
 739           "Inline arraycopy native that is known to be part of "            \
 740           "base library DLL")                                               \
 741                                                                             \
 742   diagnostic(bool, InlineObjectHash, true,                                  \
 743           "Inline Object::hashCode() native that is known to be part "      \
 744           "of base library DLL")                                            \
 745                                                                             \
 746   diagnostic(bool, InlineNatives, true,                                     \
 747           "Inline natives that are known to be part of base library DLL")   \
 748                                                                             \
 749   diagnostic(bool, InlineMathNatives, true,                                 \
 750           "Inline SinD, CosD, etc.")                                        \
 751                                                                             \
 752   diagnostic(bool, InlineClassNatives, true,                                \
 753           "Inline Class.isInstance, etc")                                   \
 754                                                                             \
 755   diagnostic(bool, InlineThreadNatives, true,                               \
 756           "Inline Thread.currentThread, etc")                               \
 757                                                                             \
 758   diagnostic(bool, InlineUnsafeOps, true,                                   \
 759           "Inline memory ops (native methods) from Unsafe")                 \
 760                                                                             \
 761   product(bool, CriticalJNINatives, true,                                   \
 762           "Check for critical JNI entry points")                            \
 763                                                                             \
 764   notproduct(bool, StressCriticalJNINatives, false,                         \
 765           "Exercise register saving code in critical natives")              \
 766                                                                             \
 767   diagnostic(bool, UseAESIntrinsics, false,                                 \
 768           "Use intrinsics for AES versions of crypto")                      \
 769                                                                             \
 770   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 771           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 772                                                                             \
 773   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 774           "Use intrinsics for SHA-1 crypto hash function. "                 \
 775           "Requires that UseSHA is enabled.")                               \
 776                                                                             \
 777   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 778           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 779           "Requires that UseSHA is enabled.")                               \
 780                                                                             \
 781   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 782           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 783           "Requires that UseSHA is enabled.")                               \
 784                                                                             \
 785   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 786           "use intrinsics for java.util.zip.CRC32")                         \
 787                                                                             \
 788   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 789           "use intrinsics for java.util.zip.CRC32C")                        \
 790                                                                             \
 791   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 792           "use intrinsics for java.util.zip.Adler32")                       \
 793                                                                             \
 794   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 795           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 796                                                                             \
 797   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 798          "do not expand intrinsics whose (internal) names appear here")     \
 799                                                                             \
 800   develop(bool, TraceCallFixup, false,                                      \
 801           "Trace all call fixups")                                          \
 802                                                                             \
 803   develop(bool, DeoptimizeALot, false,                                      \
 804           "Deoptimize at every exit from the runtime system")               \
 805                                                                             \
 806   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 807           "A comma separated list of bcis to deoptimize at")                \
 808                                                                             \
 809   product(bool, DeoptimizeRandom, false,                                    \
 810           "Deoptimize random frames on random exit from the runtime system")\
 811                                                                             \
 812   notproduct(bool, ZombieALot, false,                                       \
 813           "Create zombies (non-entrant) at exit from the runtime system")   \
 814                                                                             \
 815   product(bool, UnlinkSymbolsALot, false,                                   \
 816           "Unlink unreferenced symbols from the symbol table at safepoints")\
 817                                                                             \
 818   notproduct(bool, WalkStackALot, false,                                    \
 819           "Trace stack (no print) at every exit from the runtime system")   \
 820                                                                             \
 821   product(bool, Debugging, false,                                           \
 822           "Set when executing debug methods in debug.cpp "                  \
 823           "(to prevent triggering assertions)")                             \
 824                                                                             \
 825   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 826           "Enable strict checks that safepoints cannot happen for threads " \
 827           "that use NoSafepointVerifier")                                   \
 828                                                                             \
 829   notproduct(bool, VerifyLastFrame, false,                                  \
 830           "Verify oops on last frame on entry to VM")                       \
 831                                                                             \
 832   product(bool, FailOverToOldVerifier, true,                                \
 833           "Fail over to old verifier when split verifier fails")            \
 834                                                                             \
 835   develop(bool, ShowSafepointMsgs, false,                                   \
 836           "Show message about safepoint synchronization")                   \
 837                                                                             \
 838   product(bool, SafepointTimeout, false,                                    \
 839           "Time out and warn or fail after SafepointTimeoutDelay "          \
 840           "milliseconds if failed to reach safepoint")                      \
 841                                                                             \
 842   develop(bool, DieOnSafepointTimeout, false,                               \
 843           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 844                                                                             \
 845   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 846   /* typically, at most a few retries are needed                    */      \
 847   product(intx, SuspendRetryCount, 50,                                      \
 848           "Maximum retry count for an external suspend request")            \
 849           range(0, max_intx)                                                \
 850                                                                             \
 851   product(intx, SuspendRetryDelay, 5,                                       \
 852           "Milliseconds to delay per retry (* current_retry_count)")        \
 853           range(0, max_intx)                                                \
 854                                                                             \
 855   product(bool, AssertOnSuspendWaitFailure, false,                          \
 856           "Assert/Guarantee on external suspend wait failure")              \
 857                                                                             \
 858   product(bool, TraceSuspendWaitFailures, false,                            \
 859           "Trace external suspend wait failures")                           \
 860                                                                             \
 861   product(bool, MaxFDLimit, true,                                           \
 862           "Bump the number of file descriptors to maximum in Solaris")      \
 863                                                                             \
 864   diagnostic(bool, LogEvents, true,                                         \
 865           "Enable the various ring buffer event logs")                      \
 866                                                                             \
 867   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 868           "Number of ring buffer event logs")                               \
 869           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 870                                                                             \
 871   product(bool, BytecodeVerificationRemote, true,                           \
 872           "Enable the Java bytecode verifier for remote classes")           \
 873                                                                             \
 874   product(bool, BytecodeVerificationLocal, false,                           \
 875           "Enable the Java bytecode verifier for local classes")            \
 876                                                                             \
 877   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 878           "Force exceptions on FP stack under/overflow")                    \
 879                                                                             \
 880   develop(bool, VerifyStackAtCalls, false,                                  \
 881           "Verify that the stack pointer is unchanged after calls")         \
 882                                                                             \
 883   develop(bool, TraceJavaAssertions, false,                                 \
 884           "Trace java language assertions")                                 \
 885                                                                             \
 886   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 887           "Temporary - see javaClasses.cpp")                                \
 888                                                                             \
 889   notproduct(bool, PrintMallocFree, false,                                  \
 890           "Trace calls to C heap malloc/free allocation")                   \
 891                                                                             \
 892   notproduct(bool, VerifyCodeCache, false,                                  \
 893           "Verify code cache on memory allocation/deallocation")            \
 894                                                                             \
 895   develop(bool, UseMallocOnly, false,                                       \
 896           "Use only malloc/free for allocation (no resource area/arena)")   \
 897                                                                             \
 898   develop(bool, PrintMalloc, false,                                         \
 899           "Print all malloc/free calls")                                    \
 900                                                                             \
 901   develop(bool, PrintMallocStatistics, false,                               \
 902           "Print malloc/free statistics")                                   \
 903                                                                             \
 904   develop(bool, ZapResourceArea, trueInDebug,                               \
 905           "Zap freed resource/arena space with 0xABABABAB")                 \
 906                                                                             \
 907   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 908           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 909                                                                             \
 910   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 911           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 912                                                                             \
 913   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 914           "Zap allocated/freed stack segments with 0xFADFADED")             \
 915                                                                             \
 916   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 917           "Zap unused heap space with 0xBAADBABE")                          \
 918                                                                             \
 919   develop(bool, CheckZapUnusedHeapArea, false,                              \
 920           "Check zapping of unused heap space")                             \
 921                                                                             \
 922   develop(bool, ZapFillerObjects, trueInDebug,                              \
 923           "Zap filler objects with 0xDEAFBABE")                             \
 924                                                                             \
 925   develop(bool, PrintVMMessages, true,                                      \
 926           "Print VM messages on console")                                   \
 927                                                                             \
 928   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 929           "If > 0, provokes an error after VM initialization; the value "   \
 930           "determines which error to provoke. See test_error_handler() "    \
 931           "in vmError.cpp.")                                                \
 932                                                                             \
 933   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 934           "If > 0, provokes an error inside VM error handler (a secondary " \
 935           "crash). see test_error_handler() in vmError.cpp")                \
 936                                                                             \
 937   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 938           "If true, tests SafeFetch inside error handler.")                 \
 939                                                                             \
 940   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 941           "If true, simulates an unresponsive error handler.")              \
 942                                                                             \
 943   develop(bool, Verbose, false,                                             \
 944           "Print additional debugging information from other modes")        \
 945                                                                             \
 946   develop(bool, PrintMiscellaneous, false,                                  \
 947           "Print uncategorized debugging information (requires +Verbose)")  \
 948                                                                             \
 949   develop(bool, WizardMode, false,                                          \
 950           "Print much more debugging information")                          \
 951                                                                             \
 952   product(bool, ShowMessageBoxOnError, false,                               \
 953           "Keep process alive on VM fatal error")                           \
 954                                                                             \
 955   product(bool, CreateCoredumpOnCrash, true,                                \
 956           "Create core/mini dump on VM fatal error")                        \
 957                                                                             \
 958   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 959           "Timeout, in seconds, to limit the time spent on writing an "     \
 960           "error log in case of a crash.")                                  \
 961           range(0, (uint64_t)max_jlong/1000)                                \
 962                                                                             \
 963   product_pd(bool, UseOSErrorReporting,                                     \
 964           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 965                                                                             \
 966   product(bool, SuppressFatalErrorMessage, false,                           \
 967           "Report NO fatal error message (avoid deadlock)")                 \
 968                                                                             \
 969   product(ccstrlist, OnError, "",                                           \
 970           "Run user-defined commands on fatal error; see VMError.cpp "      \
 971           "for examples")                                                   \
 972                                                                             \
 973   product(ccstrlist, OnOutOfMemoryError, "",                                \
 974           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 975                                                                             \
 976   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 977           "Dump heap to file before any major stop-the-world GC")           \
 978                                                                             \
 979   manageable(bool, HeapDumpAfterFullGC, false,                              \
 980           "Dump heap to file after any major stop-the-world GC")            \
 981                                                                             \
 982   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 983           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 984                                                                             \
 985   manageable(ccstr, HeapDumpPath, NULL,                                     \
 986           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 987           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 988           "in the working directory)")                                      \
 989                                                                             \
 990   develop(bool, BreakAtWarning, false,                                      \
 991           "Execute breakpoint upon encountering VM warning")                \
 992                                                                             \
 993   develop(bool, UseFakeTimers, false,                                       \
 994           "Tell whether the VM should use system time or a fake timer")     \
 995                                                                             \
 996   product(ccstr, NativeMemoryTracking, "off",                               \
 997           "Native memory tracking options")                                 \
 998                                                                             \
 999   diagnostic(bool, PrintNMTStatistics, false,                               \
1000           "Print native memory tracking summary data if it is on")          \
1001                                                                             \
1002   diagnostic(bool, LogCompilation, false,                                   \
1003           "Log compilation activity in detail to LogFile")                  \
1004                                                                             \
1005   product(bool, PrintCompilation, false,                                    \
1006           "Print compilations")                                             \
1007                                                                             \
1008   diagnostic(bool, TraceNMethodInstalls, false,                             \
1009           "Trace nmethod installation")                                     \
1010                                                                             \
1011   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1012           "0: do not allow scavengable oops in the code cache; "            \
1013           "1: allow scavenging from the code cache; "                       \
1014           "2: emit as many constants as the compiler can see")              \
1015           range(0, 2)                                                       \
1016                                                                             \
1017   product(bool, AlwaysRestoreFPU, false,                                    \
1018           "Restore the FPU control word after every JNI call (expensive)")  \
1019                                                                             \
1020   diagnostic(bool, PrintCompilation2, false,                                \
1021           "Print additional statistics per compilation")                    \
1022                                                                             \
1023   diagnostic(bool, PrintAdapterHandlers, false,                             \
1024           "Print code generated for i2c/c2i adapters")                      \
1025                                                                             \
1026   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1027           "Verify that i2c/c2i adapters are called properly")               \
1028                                                                             \
1029   develop(bool, VerifyAdapterSharing, false,                                \
1030           "Verify that the code for shared adapters is the equivalent")     \
1031                                                                             \
1032   diagnostic(bool, PrintAssembly, false,                                    \
1033           "Print assembly code (using external disassembler.so)")           \
1034                                                                             \
1035   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1036           "Print options string passed to disassembler.so")                 \
1037                                                                             \
1038   notproduct(bool, PrintNMethodStatistics, false,                           \
1039           "Print a summary statistic for the generated nmethods")           \
1040                                                                             \
1041   diagnostic(bool, PrintNMethods, false,                                    \
1042           "Print assembly code for nmethods when generated")                \
1043                                                                             \
1044   diagnostic(bool, PrintNativeNMethods, false,                              \
1045           "Print assembly code for native nmethods when generated")         \
1046                                                                             \
1047   develop(bool, PrintDebugInfo, false,                                      \
1048           "Print debug information for all nmethods when generated")        \
1049                                                                             \
1050   develop(bool, PrintRelocations, false,                                    \
1051           "Print relocation information for all nmethods when generated")   \
1052                                                                             \
1053   develop(bool, PrintDependencies, false,                                   \
1054           "Print dependency information for all nmethods when generated")   \
1055                                                                             \
1056   develop(bool, PrintExceptionHandlers, false,                              \
1057           "Print exception handler tables for all nmethods when generated") \
1058                                                                             \
1059   develop(bool, StressCompiledExceptionHandlers, false,                     \
1060           "Exercise compiled exception handlers")                           \
1061                                                                             \
1062   develop(bool, InterceptOSException, false,                                \
1063           "Start debugger when an implicit OS (e.g. NULL) "                 \
1064           "exception happens")                                              \
1065                                                                             \
1066   product(bool, PrintCodeCache, false,                                      \
1067           "Print the code cache memory usage when exiting")                 \
1068                                                                             \
1069   develop(bool, PrintCodeCache2, false,                                     \
1070           "Print detailed usage information on the code cache when exiting")\
1071                                                                             \
1072   product(bool, PrintCodeCacheOnCompilation, false,                         \
1073           "Print the code cache memory usage each time a method is "        \
1074           "compiled")                                                       \
1075                                                                             \
1076   diagnostic(bool, PrintStubCode, false,                                    \
1077           "Print generated stub code")                                      \
1078                                                                             \
1079   product(bool, StackTraceInThrowable, true,                                \
1080           "Collect backtrace in throwable when exception happens")          \
1081                                                                             \
1082   product(bool, OmitStackTraceInFastThrow, true,                            \
1083           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1084                                                                             \
1085   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1086           "Print bytecode statistics when dumping profiler output")         \
1087                                                                             \
1088   product(bool, ProfilerRecordPC, false,                                    \
1089           "Collect ticks for each 16 byte interval of compiled code")       \
1090                                                                             \
1091   product(bool, ProfileVM, false,                                           \
1092           "Profile ticks that fall within VM (either in the VM Thread "     \
1093           "or VM code called through stubs)")                               \
1094                                                                             \
1095   product(bool, ProfileIntervals, false,                                    \
1096           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1097                                                                             \
1098   notproduct(bool, ProfilerCheckIntervals, false,                           \
1099           "Collect and print information on spacing of profiler ticks")     \
1100                                                                             \
1101   product(bool, PrintWarnings, true,                                        \
1102           "Print JVM warnings to output stream")                            \
1103                                                                             \
1104   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1105           "Print warnings for stalled SpinLocks")                           \
1106                                                                             \
1107   product(bool, RegisterFinalizersAtInit, true,                             \
1108           "Register finalizable objects at end of Object.<init> or "        \
1109           "after allocation")                                               \
1110                                                                             \
1111   develop(bool, RegisterReferences, true,                                   \
1112           "Tell whether the VM should register soft/weak/final/phantom "    \
1113           "references")                                                     \
1114                                                                             \
1115   develop(bool, IgnoreRewrites, false,                                      \
1116           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1117           "This is unsafe!")                                                \
1118                                                                             \
1119   develop(bool, PrintCodeCacheExtension, false,                             \
1120           "Print extension of code cache")                                  \
1121                                                                             \
1122   develop(bool, UsePrivilegedStack, true,                                   \
1123           "Enable the security JVM functions")                              \
1124                                                                             \
1125   develop(bool, ProtectionDomainVerification, true,                         \
1126           "Verify protection domain before resolution in system dictionary")\
1127                                                                             \
1128   product(bool, ClassUnloading, true,                                       \
1129           "Do unloading of classes")                                        \
1130                                                                             \
1131   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1132           "Do unloading of classes with a concurrent marking cycle")        \
1133                                                                             \
1134   develop(bool, DisableStartThread, false,                                  \
1135           "Disable starting of additional Java threads "                    \
1136           "(for debugging only)")                                           \
1137                                                                             \
1138   develop(bool, MemProfiling, false,                                        \
1139           "Write memory usage profiling to log file")                       \
1140                                                                             \
1141   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1142           "Print the system dictionary at exit")                            \
1143                                                                             \
1144   experimental(intx, PredictedLoadedClassCount, 0,                          \
1145           "Experimental: Tune loaded class cache starting size")            \
1146                                                                             \
1147   diagnostic(bool, UnsyncloadClass, false,                                  \
1148           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1149           "class loader must call VM synchronized for findClass "           \
1150           "and defineClass.")                                               \
1151                                                                             \
1152   product(bool, AlwaysLockClassLoader, false,                               \
1153           "Require the VM to acquire the class loader lock before calling " \
1154           "loadClass() even for class loaders registering "                 \
1155           "as parallel capable")                                            \
1156                                                                             \
1157   product(bool, AllowParallelDefineClass, false,                            \
1158           "Allow parallel defineClass requests for class loaders "          \
1159           "registering as parallel capable")                                \
1160                                                                             \
1161   product(bool, MustCallLoadClassInternal, false,                           \
1162           "Call loadClassInternal() rather than loadClass()")               \
1163                                                                             \
1164   product_pd(bool, DontYieldALot,                                           \
1165           "Throw away obvious excess yield calls")                          \
1166                                                                             \
1167   develop(bool, UseDetachedThreads, true,                                   \
1168           "Use detached threads that are recycled upon termination "        \
1169           "(for Solaris only)")                                             \
1170                                                                             \
1171   product(bool, UseLWPSynchronization, true,                                \
1172           "Use LWP-based instead of libthread-based synchronization "       \
1173           "(SPARC only)")                                                   \
1174                                                                             \
1175   experimental(ccstr, SyncKnobs, NULL,                                      \
1176                "(Unstable) Various monitor synchronization tunables")       \
1177                                                                             \
1178   experimental(intx, EmitSync, 0,                                           \
1179                "(Unsafe, Unstable) "                                        \
1180                "Control emission of inline sync fast-path code")            \
1181                                                                             \
1182   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1183           range(0, max_jint)                                                \
1184                                                                             \
1185   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1186                                                                             \
1187   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1188                 "Percentage of used monitors before triggering cleanup "    \
1189                 "safepoint which deflates monitors (0 is off). "            \
1190                 "The check is performed on GuaranteedSafepointInterval.")   \
1191                 range(0, 100)                                               \
1192                                                                             \
1193   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1194                "Experimental Sync flags")                                   \
1195                                                                             \
1196   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1197                                                                             \
1198   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1199                                                                             \
1200   experimental(intx, hashCode, 5,                                           \
1201                "(Unstable) select hashCode generation algorithm")           \
1202                                                                             \
1203   product(bool, FilterSpuriousWakeups, true,                                \
1204           "When true prevents OS-level spurious, or premature, wakeups "    \
1205           "from Object.wait (Ignored for Windows)")                         \
1206                                                                             \
1207   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1208                                                                             \
1209   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1210                                                                             \
1211   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1212                                                                             \
1213   develop(bool, UsePthreads, false,                                         \
1214           "Use pthread-based instead of libthread-based synchronization "   \
1215           "(SPARC only)")                                                   \
1216                                                                             \
1217   product(bool, ReduceSignalUsage, false,                                   \
1218           "Reduce the use of OS signals in Java and/or the VM")             \
1219                                                                             \
1220   develop_pd(bool, ShareVtableStubs,                                        \
1221           "Share vtable stubs (smaller code but worse branch prediction")   \
1222                                                                             \
1223   develop(bool, LoadLineNumberTables, true,                                 \
1224           "Tell whether the class file parser loads line number tables")    \
1225                                                                             \
1226   develop(bool, LoadLocalVariableTables, true,                              \
1227           "Tell whether the class file parser loads local variable tables") \
1228                                                                             \
1229   develop(bool, LoadLocalVariableTypeTables, true,                          \
1230           "Tell whether the class file parser loads local variable type"    \
1231           "tables")                                                         \
1232                                                                             \
1233   product(bool, AllowUserSignalHandlers, false,                             \
1234           "Do not complain if the application installs signal handlers "    \
1235           "(Solaris & Linux only)")                                         \
1236                                                                             \
1237   product(bool, UseSignalChaining, true,                                    \
1238           "Use signal-chaining to invoke signal handlers installed "        \
1239           "by the application (Solaris & Linux only)")                      \
1240                                                                             \
1241   product(bool, AllowJNIEnvProxy, false,                                    \
1242           "Allow JNIEnv proxies for jdbx")                                  \
1243                                                                             \
1244   product(bool, RestoreMXCSROnJNICalls, false,                              \
1245           "Restore MXCSR when returning from JNI calls")                    \
1246                                                                             \
1247   product(bool, CheckJNICalls, false,                                       \
1248           "Verify all arguments to JNI calls")                              \
1249                                                                             \
1250   product(bool, CheckEndorsedAndExtDirs, false,                             \
1251           "Verify the endorsed and extension directories are not used")     \
1252                                                                             \
1253   product(bool, UseFastJNIAccessors, true,                                  \
1254           "Use optimized versions of Get<Primitive>Field")                  \
1255                                                                             \
1256   product(intx, MaxJNILocalCapacity, 65536,                                 \
1257           "Maximum allowable local JNI handle capacity to "                 \
1258           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1259           "where <= 0 is unlimited, default: 65536")                        \
1260           range(min_intx, max_intx)                                         \
1261                                                                             \
1262   product(bool, EagerXrunInit, false,                                       \
1263           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1264           "but not all -Xrun libraries may support the state of the VM "    \
1265           "at this time")                                                   \
1266                                                                             \
1267   product(bool, PreserveAllAnnotations, false,                              \
1268           "Preserve RuntimeInvisibleAnnotations as well "                   \
1269           "as RuntimeVisibleAnnotations")                                   \
1270                                                                             \
1271   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1272           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1273                                                                             \
1274   product(bool, UseXMMForArrayCopy, false,                                  \
1275           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1276                                                                             \
1277   product(intx, FieldsAllocationStyle, 1,                                   \
1278           "0 - type based with oops first, "                                \
1279           "1 - with oops last, "                                            \
1280           "2 - oops in super and sub classes are together")                 \
1281           range(0, 2)                                                       \
1282                                                                             \
1283   product(bool, CompactFields, true,                                        \
1284           "Allocate nonstatic fields in gaps between previous fields")      \
1285                                                                             \
1286   notproduct(bool, PrintFieldLayout, false,                                 \
1287           "Print field layout for each class")                              \
1288                                                                             \
1289   /* Need to limit the extent of the padding to reasonable size.          */\
1290   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1291   /* aggressive prefetching, while still leaving the room for segregating */\
1292   /* among the distinct pages.                                            */\
1293   product(intx, ContendedPaddingWidth, 128,                                 \
1294           "How many bytes to pad the fields/classes marked @Contended with")\
1295           range(0, 8192)                                                    \
1296           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1297                                                                             \
1298   product(bool, EnableContended, true,                                      \
1299           "Enable @Contended annotation support")                           \
1300                                                                             \
1301   product(bool, RestrictContended, true,                                    \
1302           "Restrict @Contended to trusted classes")                         \
1303                                                                             \
1304   product(bool, UseBiasedLocking, true,                                     \
1305           "Enable biased locking in JVM")                                   \
1306                                                                             \
1307   product(intx, BiasedLockingStartupDelay, 4000,                            \
1308           "Number of milliseconds to wait before enabling biased locking")  \
1309           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1310           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1311                                                                             \
1312   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1313           "Print statistics of biased locking in JVM")                      \
1314                                                                             \
1315   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1316           "Threshold of number of revocations per type to try to "          \
1317           "rebias all objects in the heap of that type")                    \
1318           range(0, max_intx)                                                \
1319           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1320                                                                             \
1321   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1322           "Threshold of number of revocations per type to permanently "     \
1323           "revoke biases of all objects in the heap of that type")          \
1324           range(0, max_intx)                                                \
1325           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1326                                                                             \
1327   product(intx, BiasedLockingDecayTime, 25000,                              \
1328           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1329           "type after previous bulk rebias")                                \
1330           range(500, max_intx)                                              \
1331           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1332                                                                             \
1333   product(bool, ExitOnOutOfMemoryError, false,                              \
1334           "JVM exits on the first occurrence of an out-of-memory error")    \
1335                                                                             \
1336   product(bool, CrashOnOutOfMemoryError, false,                             \
1337           "JVM aborts, producing an error log and core/mini dump, on the "  \
1338           "first occurrence of an out-of-memory error")                     \
1339                                                                             \
1340   /* tracing */                                                             \
1341                                                                             \
1342   develop(bool, StressRewriter, false,                                      \
1343           "Stress linktime bytecode rewriting")                             \
1344                                                                             \
1345   product(ccstr, TraceJVMTI, NULL,                                          \
1346           "Trace flags for JVMTI functions and events")                     \
1347                                                                             \
1348   /* This option can change an EMCP method into an obsolete method. */      \
1349   /* This can affect tests that except specific methods to be EMCP. */      \
1350   /* This option should be used with caution.                       */      \
1351   product(bool, StressLdcRewrite, false,                                    \
1352           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1353                                                                             \
1354   /* change to false by default sometime after Mustang */                   \
1355   product(bool, VerifyMergedCPBytecodes, true,                              \
1356           "Verify bytecodes after RedefineClasses constant pool merging")   \
1357                                                                             \
1358   develop(bool, TraceBytecodes, false,                                      \
1359           "Trace bytecode execution")                                       \
1360                                                                             \
1361   develop(bool, TraceICs, false,                                            \
1362           "Trace inline cache changes")                                     \
1363                                                                             \
1364   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1365           "Trace method invocation counter overflow")                       \
1366                                                                             \
1367   develop(bool, TraceInlineCacheClearing, false,                            \
1368           "Trace clearing of inline caches in nmethods")                    \
1369                                                                             \
1370   develop(bool, TraceDependencies, false,                                   \
1371           "Trace dependencies")                                             \
1372                                                                             \
1373   develop(bool, VerifyDependencies, trueInDebug,                            \
1374           "Exercise and verify the compilation dependency mechanism")       \
1375                                                                             \
1376   develop(bool, TraceNewOopMapGeneration, false,                            \
1377           "Trace OopMapGeneration")                                         \
1378                                                                             \
1379   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1380           "Trace OopMapGeneration: print detailed cell states")             \
1381                                                                             \
1382   develop(bool, TimeOopMap, false,                                          \
1383           "Time calls to GenerateOopMap::compute_map() in sum")             \
1384                                                                             \
1385   develop(bool, TimeOopMap2, false,                                         \
1386           "Time calls to GenerateOopMap::compute_map() individually")       \
1387                                                                             \
1388   develop(bool, TraceOopMapRewrites, false,                                 \
1389           "Trace rewriting of method oops during oop map generation")       \
1390                                                                             \
1391   develop(bool, TraceICBuffer, false,                                       \
1392           "Trace usage of IC buffer")                                       \
1393                                                                             \
1394   develop(bool, TraceCompiledIC, false,                                     \
1395           "Trace changes of compiled IC")                                   \
1396                                                                             \
1397   /* gc */                                                                  \
1398                                                                             \
1399   product(bool, UseSerialGC, false,                                         \
1400           "Use the Serial garbage collector")                               \
1401                                                                             \
1402   product(bool, UseG1GC, false,                                             \
1403           "Use the Garbage-First garbage collector")                        \
1404                                                                             \
1405   product(bool, UseParallelGC, false,                                       \
1406           "Use the Parallel Scavenge garbage collector")                    \
1407                                                                             \
1408   product(bool, UseParallelOldGC, false,                                    \
1409           "Use the Parallel Old garbage collector")                         \
1410                                                                             \
1411   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1412           "How often should we maximally compact the heap (not allowing "   \
1413           "any dead space)")                                                \
1414           range(0, max_uintx)                                               \
1415                                                                             \
1416   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1417           "The collection count for the first maximum compaction")          \
1418           range(0, max_uintx)                                               \
1419                                                                             \
1420   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1421           "Use maximum compaction in the Parallel Old garbage collector "   \
1422           "for a system GC")                                                \
1423                                                                             \
1424   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1425           "The mean used by the parallel compact dead wood "                \
1426           "limiter (a number between 0-100)")                               \
1427           range(0, 100)                                                     \
1428                                                                             \
1429   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1430           "The standard deviation used by the parallel compact dead wood "  \
1431           "limiter (a number between 0-100)")                               \
1432           range(0, 100)                                                     \
1433                                                                             \
1434   product(uint, ParallelGCThreads, 0,                                       \
1435           "Number of parallel threads parallel gc will use")                \
1436           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1437                                                                             \
1438   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1439             "Use semaphore synchronization for the GC Threads, "            \
1440             "instead of synchronization based on mutexes")                  \
1441                                                                             \
1442   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1443           "Dynamically choose the number of parallel threads "              \
1444           "parallel gc will use")                                           \
1445                                                                             \
1446   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1447              "Inject thread creation failures for "                         \
1448              "UseDynamicNumberOfGCThreads")                                 \
1449                                                                             \
1450   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1451           "Force dynamic selection of the number of "                       \
1452           "parallel threads parallel gc will use to aid debugging")         \
1453                                                                             \
1454   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1455           "Size of heap (bytes) per GC thread used in calculating the "     \
1456           "number of GC threads")                                           \
1457           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1458                                                                             \
1459   product(uint, ConcGCThreads, 0,                                           \
1460           "Number of threads concurrent gc will use")                       \
1461           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1462                                                                             \
1463   product(uint, GCTaskTimeStampEntries, 200,                                \
1464           "Number of time stamp entries per gc worker thread")              \
1465           range(1, max_jint)                                                \
1466                                                                             \
1467   product(bool, AlwaysTenure, false,                                        \
1468           "Always tenure objects in eden (ParallelGC only)")                \
1469                                                                             \
1470   product(bool, NeverTenure, false,                                         \
1471           "Never tenure objects in eden, may tenure on overflow "           \
1472           "(ParallelGC only)")                                              \
1473                                                                             \
1474   product(bool, ScavengeBeforeFullGC, true,                                 \
1475           "Scavenge youngest generation before each full GC.")              \
1476                                                                             \
1477   product(bool, UseConcMarkSweepGC, false,                                  \
1478           "Use Concurrent Mark-Sweep GC in the old generation")             \
1479                                                                             \
1480   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1481           "A System.gc() request invokes a concurrent collection; "         \
1482           "(effective only when using concurrent collectors)")              \
1483                                                                             \
1484   product(bool, GCLockerInvokesConcurrent, false,                           \
1485           "The exit of a JNI critical section necessitating a scavenge, "   \
1486           "also kicks off a background concurrent collection")              \
1487                                                                             \
1488   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1489           "How much the GC can expand the eden by while the GC locker "     \
1490           "is active (as a percentage)")                                    \
1491           range(0, 100)                                                     \
1492                                                                             \
1493   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1494           "Number of times to retry allocations when "                      \
1495           "blocked by the GC locker")                                       \
1496           range(0, max_uintx)                                               \
1497                                                                             \
1498   product(bool, UseCMSBestFit, true,                                        \
1499           "Use CMS best fit allocation strategy")                           \
1500                                                                             \
1501   product(uintx, ParallelGCBufferWastePct, 10,                              \
1502           "Wasted fraction of parallel allocation buffer")                  \
1503           range(0, 100)                                                     \
1504                                                                             \
1505   product(uintx, TargetPLABWastePct, 10,                                    \
1506           "Target wasted space in last buffer as percent of overall "       \
1507           "allocation")                                                     \
1508           range(1, 100)                                                     \
1509                                                                             \
1510   product(uintx, PLABWeight, 75,                                            \
1511           "Percentage (0-100) used to weight the current sample when "      \
1512           "computing exponentially decaying average for ResizePLAB")        \
1513           range(0, 100)                                                     \
1514                                                                             \
1515   product(bool, ResizePLAB, true,                                           \
1516           "Dynamically resize (survivor space) promotion LAB's")            \
1517                                                                             \
1518   product(int, ParGCArrayScanChunk, 50,                                     \
1519           "Scan a subset of object array and push remainder, if array is "  \
1520           "bigger than this")                                               \
1521           range(1, max_jint/3)                                              \
1522                                                                             \
1523   product(bool, ParGCUseLocalOverflow, false,                               \
1524           "Instead of a global overflow list, use local overflow stacks")   \
1525                                                                             \
1526   product(bool, ParGCTrimOverflow, true,                                    \
1527           "Eagerly trim the local overflow lists "                          \
1528           "(when ParGCUseLocalOverflow)")                                   \
1529                                                                             \
1530   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1531           "Simulate work queue overflow in ParNew")                         \
1532                                                                             \
1533   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1534           "An `interval' counter that determines how frequently "           \
1535           "we simulate overflow; a smaller number increases frequency")     \
1536                                                                             \
1537   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1538           "The desired number of objects to claim from the overflow list")  \
1539           range(0, max_uintx)                                               \
1540                                                                             \
1541   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1542           "The number of strides per worker thread that we divide up the "  \
1543           "card table scanning work into")                                  \
1544           range(1, max_uintx)                                               \
1545           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1546                                                                             \
1547   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1548           "The number of cards in each chunk of the parallel chunks used "  \
1549           "during card table scanning")                                     \
1550           range(1, max_intx)                                                \
1551           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1552                                                                             \
1553   product(uintx, OldPLABWeight, 50,                                         \
1554           "Percentage (0-100) used to weight the current sample when "      \
1555           "computing exponentially decaying average for resizing "          \
1556           "OldPLABSize")                                                    \
1557           range(0, 100)                                                     \
1558                                                                             \
1559   product(bool, ResizeOldPLAB, true,                                        \
1560           "Dynamically resize (old gen) promotion LAB's")                   \
1561                                                                             \
1562   product(size_t, CMSOldPLABMax, 1024,                                      \
1563           "Maximum size of CMS gen promotion LAB caches per worker "        \
1564           "per block size")                                                 \
1565           range(1, max_uintx)                                               \
1566           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1567                                                                             \
1568   product(size_t, CMSOldPLABMin, 16,                                        \
1569           "Minimum size of CMS gen promotion LAB caches per worker "        \
1570           "per block size")                                                 \
1571           range(1, max_uintx)                                               \
1572           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1573                                                                             \
1574   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1575           "Nominal number of refills of CMS gen promotion LAB cache "       \
1576           "per worker per block size")                                      \
1577           range(1, max_uintx)                                               \
1578                                                                             \
1579   product(bool, CMSOldPLABResizeQuicker, false,                             \
1580           "React on-the-fly during a scavenge to a sudden "                 \
1581           "change in block demand rate")                                    \
1582                                                                             \
1583   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1584           "The tolerance of the phase-change detector for on-the-fly "      \
1585           "PLAB resizing during a scavenge")                                \
1586           range(1, max_uintx)                                               \
1587                                                                             \
1588   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1589           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1590           "during a scavenge")                                              \
1591           range(1, max_uintx)                                               \
1592                                                                             \
1593   product(bool, AlwaysPreTouch, false,                                      \
1594           "Force all freshly committed pages to be pre-touched")            \
1595                                                                             \
1596   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1597           "Per-thread chunk size for parallel memory pre-touch.")           \
1598           range(1, SIZE_MAX / 2)                                            \
1599                                                                             \
1600   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1601           "The maximum size of young gen chosen by default per GC worker "  \
1602           "thread available")                                               \
1603           range(1, max_uintx)                                               \
1604                                                                             \
1605   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1606           "Percentage (0-100) used to add conservatism when computing the " \
1607           "duty cycle")                                                     \
1608           range(0, 100)                                                     \
1609                                                                             \
1610   product(uintx, CMSExpAvgFactor, 50,                                       \
1611           "Percentage (0-100) used to weight the current sample when "      \
1612           "computing exponential averages for CMS statistics")              \
1613           range(0, 100)                                                     \
1614                                                                             \
1615   product(uintx, CMS_FLSWeight, 75,                                         \
1616           "Percentage (0-100) used to weight the current sample when "      \
1617           "computing exponentially decaying averages for CMS FLS "          \
1618           "statistics")                                                     \
1619           range(0, 100)                                                     \
1620                                                                             \
1621   product(uintx, CMS_FLSPadding, 1,                                         \
1622           "The multiple of deviation from mean to use for buffering "       \
1623           "against volatility in free list demand")                         \
1624           range(0, max_juint)                                               \
1625                                                                             \
1626   product(uintx, FLSCoalescePolicy, 2,                                      \
1627           "CMS: aggressiveness level for coalescing, increasing "           \
1628           "from 0 to 4")                                                    \
1629           range(0, 4)                                                       \
1630                                                                             \
1631   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1632           "CMS: larger free blocks are always available for coalescing")    \
1633                                                                             \
1634   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1635           "CMS: the smaller the percentage the greater the coalescing "     \
1636           "force")                                                          \
1637           range(0.0, 1.0)                                                   \
1638                                                                             \
1639   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1640           "CMS: the factor by which to inflate estimated demand of small "  \
1641           "block sizes to prevent coalescing with an adjoining block")      \
1642           range(0.0, DBL_MAX)                                               \
1643                                                                             \
1644   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1645           "CMS: the factor by which to inflate estimated demand of large "  \
1646           "block sizes to prevent coalescing with an adjoining block")      \
1647           range(0.0, DBL_MAX)                                               \
1648                                                                             \
1649   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1650           "CMS: the factor by which to inflate estimated demand of small "  \
1651           "block sizes to prevent splitting to supply demand for smaller "  \
1652           "blocks")                                                         \
1653           range(0.0, DBL_MAX)                                               \
1654                                                                             \
1655   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1656           "CMS: the factor by which to inflate estimated demand of large "  \
1657           "block sizes to prevent splitting to supply demand for smaller "  \
1658           "blocks")                                                         \
1659           range(0.0, DBL_MAX)                                               \
1660                                                                             \
1661   product(bool, CMSExtrapolateSweep, false,                                 \
1662           "CMS: cushion for block demand during sweep")                     \
1663                                                                             \
1664   product(uintx, CMS_SweepWeight, 75,                                       \
1665           "Percentage (0-100) used to weight the current sample when "      \
1666           "computing exponentially decaying average for inter-sweep "       \
1667           "duration")                                                       \
1668           range(0, 100)                                                     \
1669                                                                             \
1670   product(uintx, CMS_SweepPadding, 1,                                       \
1671           "The multiple of deviation from mean to use for buffering "       \
1672           "against volatility in inter-sweep duration")                     \
1673           range(0, max_juint)                                               \
1674                                                                             \
1675   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1676           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1677           "duration exceeds this threshold in milliseconds")                \
1678           range(0, max_uintx)                                               \
1679                                                                             \
1680   product(bool, CMSClassUnloadingEnabled, true,                             \
1681           "Whether class unloading enabled when using CMS GC")              \
1682                                                                             \
1683   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1684           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1685           "count for which classes may not be unloaded")                    \
1686           range(0, max_uintx)                                               \
1687                                                                             \
1688   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1689           "Replenish an indexed free list with this number of chunks")      \
1690           range(1, max_uintx)                                               \
1691                                                                             \
1692   product(bool, CMSReplenishIntermediate, true,                             \
1693           "Replenish all intermediate free-list caches")                    \
1694                                                                             \
1695   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1696           "When satisfying batched demand, split blocks from the "          \
1697           "IndexedFreeList whose size is a multiple of requested size")     \
1698                                                                             \
1699   product(bool, CMSLoopWarn, false,                                         \
1700           "Warn in case of excessive CMS looping")                          \
1701                                                                             \
1702   /* where does the range max value of (max_jint - 1) come from? */         \
1703   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1704           "Maximum size of marking stack")                                  \
1705           range(1, (max_jint - 1))                                          \
1706                                                                             \
1707   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1708           "Size of marking stack")                                          \
1709           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1710                                                                             \
1711   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1712           "Simulate frequent marking stack / work queue overflow")          \
1713                                                                             \
1714   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1715           "An \"interval\" counter that determines how frequently "         \
1716           "to simulate overflow; a smaller number increases frequency")     \
1717                                                                             \
1718   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1719           "Maximum number of abortable preclean iterations, if > 0")        \
1720           range(0, max_uintx)                                               \
1721                                                                             \
1722   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1723           "Maximum time in abortable preclean (in milliseconds)")           \
1724           range(0, max_intx)                                                \
1725                                                                             \
1726   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1727           "Nominal minimum work per abortable preclean iteration")          \
1728           range(0, max_uintx)                                               \
1729                                                                             \
1730   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1731           "Time that we sleep between iterations when not given "           \
1732           "enough work per iteration")                                      \
1733           range(0, max_intx)                                                \
1734                                                                             \
1735   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1736   product(size_t, CMSRescanMultiple, 32,                                    \
1737           "Size (in cards) of CMS parallel rescan task")                    \
1738           range(1, SIZE_MAX / 4096)                                         \
1739           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1740                                                                             \
1741   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1742   product(size_t, CMSConcMarkMultiple, 32,                                  \
1743           "Size (in cards) of CMS concurrent MT marking task")              \
1744           range(1, SIZE_MAX / 4096)                                         \
1745           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1746                                                                             \
1747   product(bool, CMSAbortSemantics, false,                                   \
1748           "Whether abort-on-overflow semantics is implemented")             \
1749                                                                             \
1750   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1751           "Use the parallel initial mark.")                                 \
1752                                                                             \
1753   product(bool, CMSParallelRemarkEnabled, true,                             \
1754           "Whether parallel remark enabled (only if ParNewGC)")             \
1755                                                                             \
1756   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1757           "Whether parallel remark of survivor space "                      \
1758           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1759                                                                             \
1760   product(bool, CMSPLABRecordAlways, true,                                  \
1761           "Always record survivor space PLAB boundaries (effective only "   \
1762           "if CMSParallelSurvivorRemarkEnabled)")                           \
1763                                                                             \
1764   product(bool, CMSEdenChunksRecordAlways, true,                            \
1765           "Always record eden chunks used for the parallel initial mark "   \
1766           "or remark of eden")                                              \
1767                                                                             \
1768   product(bool, CMSConcurrentMTEnabled, true,                               \
1769           "Whether multi-threaded concurrent work enabled "                 \
1770           "(effective only if ParNewGC)")                                   \
1771                                                                             \
1772   product(bool, CMSPrecleaningEnabled, true,                                \
1773           "Whether concurrent precleaning enabled")                         \
1774                                                                             \
1775   product(uintx, CMSPrecleanIter, 3,                                        \
1776           "Maximum number of precleaning iteration passes")                 \
1777           range(0, 9)                                                       \
1778                                                                             \
1779   product(uintx, CMSPrecleanDenominator, 3,                                 \
1780           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1781           "ratio")                                                          \
1782           range(1, max_uintx)                                               \
1783           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1784                                                                             \
1785   product(uintx, CMSPrecleanNumerator, 2,                                   \
1786           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1787           "ratio")                                                          \
1788           range(0, max_uintx-1)                                             \
1789           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1790                                                                             \
1791   product(bool, CMSPrecleanRefLists1, true,                                 \
1792           "Preclean ref lists during (initial) preclean phase")             \
1793                                                                             \
1794   product(bool, CMSPrecleanRefLists2, false,                                \
1795           "Preclean ref lists during abortable preclean phase")             \
1796                                                                             \
1797   product(bool, CMSPrecleanSurvivors1, false,                               \
1798           "Preclean survivors during (initial) preclean phase")             \
1799                                                                             \
1800   product(bool, CMSPrecleanSurvivors2, true,                                \
1801           "Preclean survivors during abortable preclean phase")             \
1802                                                                             \
1803   product(uintx, CMSPrecleanThreshold, 1000,                                \
1804           "Do not iterate again if number of dirty cards is less than this")\
1805           range(100, max_uintx)                                             \
1806                                                                             \
1807   product(bool, CMSCleanOnEnter, true,                                      \
1808           "Clean-on-enter optimization for reducing number of dirty cards") \
1809                                                                             \
1810   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1811           "Choose variant (1,2) of verification following remark")          \
1812           range(1, 2)                                                       \
1813                                                                             \
1814   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1815           "If Eden size is below this, do not try to schedule remark")      \
1816           range(0, max_uintx)                                               \
1817                                                                             \
1818   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1819           "The Eden occupancy percentage (0-100) at which "                 \
1820           "to try and schedule remark pause")                               \
1821           range(0, 100)                                                     \
1822                                                                             \
1823   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1824           "Start sampling eden top at least before young gen "              \
1825           "occupancy reaches 1/<ratio> of the size at which "               \
1826           "we plan to schedule remark")                                     \
1827           range(1, max_uintx)                                               \
1828                                                                             \
1829   product(uintx, CMSSamplingGrain, 16*K,                                    \
1830           "The minimum distance between eden samples for CMS (see above)")  \
1831           range(ObjectAlignmentInBytes, max_uintx)                          \
1832           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1833                                                                             \
1834   product(bool, CMSScavengeBeforeRemark, false,                             \
1835           "Attempt scavenge before the CMS remark step")                    \
1836                                                                             \
1837   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1838           "Don't drain below this size per parallel worker/thief")          \
1839           range(1, max_juint)                                               \
1840           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1841                                                                             \
1842   manageable(intx, CMSWaitDuration, 2000,                                   \
1843           "Time in milliseconds that CMS thread waits for young GC")        \
1844           range(min_jint, max_jint)                                         \
1845                                                                             \
1846   develop(uintx, CMSCheckInterval, 1000,                                    \
1847           "Interval in milliseconds that CMS thread checks if it "          \
1848           "should start a collection cycle")                                \
1849                                                                             \
1850   product(bool, CMSYield, true,                                             \
1851           "Yield between steps of CMS")                                     \
1852                                                                             \
1853   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1854           "Bitmap operations should process at most this many bits "        \
1855           "between yields")                                                 \
1856           range(1, max_uintx)                                               \
1857           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1858                                                                             \
1859   product(bool, CMSPrintChunksInDump, false,                                \
1860           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1861           "trace level include more detailed information about the"         \
1862           "free chunks")                \
1863                                                                             \
1864   product(bool, CMSPrintObjectsInDump, false,                               \
1865           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1866           "trace level include more detailed information about the"         \
1867           "allocated objects")                                              \
1868                                                                             \
1869   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1870           "Verify that all references across the FLS boundary "             \
1871           "are to valid objects")                                           \
1872                                                                             \
1873   diagnostic(bool, FLSVerifyLists, false,                                   \
1874           "Do lots of (expensive) FreeListSpace verification")              \
1875                                                                             \
1876   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1877           "Do lots of (expensive) FLS index table verification")            \
1878                                                                             \
1879   develop(bool, FLSVerifyDictionary, false,                                 \
1880           "Do lots of (expensive) FLS dictionary verification")             \
1881                                                                             \
1882   develop(bool, VerifyBlockOffsetArray, false,                              \
1883           "Do (expensive) block offset array verification")                 \
1884                                                                             \
1885   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1886           "Maintain _unallocated_block in BlockOffsetArray "                \
1887           "(currently applicable only to CMS collector)")                   \
1888                                                                             \
1889   product(intx, RefDiscoveryPolicy, 0,                                      \
1890           "Select type of reference discovery policy: "                     \
1891           "reference-based(0) or referent-based(1)")                        \
1892           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1893                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1894                                                                             \
1895   product(bool, ParallelRefProcEnabled, false,                              \
1896           "Enable parallel reference processing whenever possible")         \
1897                                                                             \
1898   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1899           "Enable balancing of reference processing queues")                \
1900                                                                             \
1901   product(uintx, CMSTriggerRatio, 80,                                       \
1902           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1903           "allocated before a CMS collection cycle commences")              \
1904           range(0, 100)                                                     \
1905                                                                             \
1906   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1907           "Percentage CMS generation occupancy at which to "                \
1908           "initiate CMS collection for bootstrapping collection stats")     \
1909           range(0, 100)                                                     \
1910                                                                             \
1911   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1912           "Percentage CMS generation occupancy to start a CMS collection "  \
1913           "cycle. A negative value means that CMSTriggerRatio is used")     \
1914           range(min_intx, 100)                                              \
1915                                                                             \
1916   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1917           "The percent occupancy (IHOP) of the current old generation "     \
1918           "capacity above which a concurrent mark cycle will be initiated " \
1919           "Its value may change over time if adaptive IHOP is enabled, "    \
1920           "otherwise the value remains constant. "                          \
1921           "In the latter case a value of 0 will result as frequent as "     \
1922           "possible concurrent marking cycles. A value of 100 disables "    \
1923           "concurrent marking. "                                            \
1924           "Fragmentation waste in the old generation is not considered "    \
1925           "free space in this calculation. (G1 collector only)")            \
1926           range(0, 100)                                                     \
1927                                                                             \
1928   manageable(intx, CMSTriggerInterval, -1,                                  \
1929           "Commence a CMS collection cycle (at least) every so many "       \
1930           "milliseconds (0 permanently, -1 disabled)")                      \
1931           range(-1, max_intx)                                               \
1932                                                                             \
1933   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1934           "Only use occupancy as a criterion for starting a CMS collection")\
1935                                                                             \
1936   product(uintx, CMSIsTooFullPercentage, 98,                                \
1937           "An absolute ceiling above which CMS will always consider the "   \
1938           "unloading of classes when class unloading is enabled")           \
1939           range(0, 100)                                                     \
1940                                                                             \
1941   develop(bool, CMSTestInFreeList, false,                                   \
1942           "Check if the coalesced range is already in the "                 \
1943           "free lists as claimed")                                          \
1944                                                                             \
1945   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1946           "Check that all the garbage collected was returned to the "       \
1947           "free lists")                                                     \
1948                                                                             \
1949   notproduct(bool, ScavengeALot, false,                                     \
1950           "Force scavenge at every Nth exit from the runtime system "       \
1951           "(N=ScavengeALotInterval)")                                       \
1952                                                                             \
1953   develop(bool, FullGCALot, false,                                          \
1954           "Force full gc at every Nth exit from the runtime system "        \
1955           "(N=FullGCALotInterval)")                                         \
1956                                                                             \
1957   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1958           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1959                                                                             \
1960   notproduct(bool, PromotionFailureALot, false,                             \
1961           "Use promotion failure handling on every youngest generation "    \
1962           "collection")                                                     \
1963                                                                             \
1964   develop(uintx, PromotionFailureALotCount, 1000,                           \
1965           "Number of promotion failures occurring at PLAB "                 \
1966           "refill attempts (ParNew) or promotion attempts "                 \
1967           "(other young collectors)")                                       \
1968                                                                             \
1969   develop(uintx, PromotionFailureALotInterval, 5,                           \
1970           "Total collections between promotion failures a lot")             \
1971                                                                             \
1972   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1973           "Sleep time when sleep is used for yields")                       \
1974                                                                             \
1975   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1976           "Number of yields before a sleep is done during work stealing")   \
1977                                                                             \
1978   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1979           "Number of iterations in a spin loop between checks on "          \
1980           "time out of hard spin")                                          \
1981                                                                             \
1982   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1983           "Ratio of hard spins to calls to yield")                          \
1984                                                                             \
1985   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1986           "Number of object array elements to push onto the marking stack " \
1987           "before pushing a continuation entry")                            \
1988                                                                             \
1989   develop(bool, MetadataAllocationFailALot, false,                          \
1990           "Fail metadata allocations at intervals controlled by "           \
1991           "MetadataAllocationFailALotInterval")                             \
1992                                                                             \
1993   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1994           "Metadata allocation failure a lot interval")                     \
1995                                                                             \
1996   notproduct(bool, ExecuteInternalVMTests, false,                           \
1997           "Enable execution of internal VM tests")                          \
1998                                                                             \
1999   notproduct(bool, VerboseInternalVMTests, false,                           \
2000           "Turn on logging for internal VM tests.")                         \
2001                                                                             \
2002   product(bool, ExecutingUnitTests, false,                                  \
2003           "Whether the JVM is running unit tests or not")                   \
2004                                                                             \
2005   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2006                                                                             \
2007   product_pd(bool, ResizeTLAB,                                              \
2008           "Dynamically resize TLAB size for threads")                       \
2009                                                                             \
2010   product(bool, ZeroTLAB, false,                                            \
2011           "Zero out the newly created TLAB")                                \
2012                                                                             \
2013   product(bool, FastTLABRefill, true,                                       \
2014           "Use fast TLAB refill code")                                      \
2015                                                                             \
2016   product(bool, TLABStats, true,                                            \
2017           "Provide more detailed and expensive TLAB statistics.")           \
2018                                                                             \
2019   product_pd(bool, NeverActAsServerClassMachine,                            \
2020           "Never act like a server-class machine")                          \
2021                                                                             \
2022   product(bool, AlwaysActAsServerClassMachine, false,                       \
2023           "Always act like a server-class machine")                         \
2024                                                                             \
2025   product_pd(uint64_t, MaxRAM,                                              \
2026           "Real memory size (in bytes) used to set maximum heap size")      \
2027           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2028                                                                             \
2029   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2030           "Maximum ergonomically set heap size (in bytes); zero means use " \
2031           "MaxRAM / MaxRAMFraction")                                        \
2032           range(0, max_uintx)                                               \
2033                                                                             \
2034   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2035           "Use CGroup memory limit as physical memory limit for heap "      \
2036           "sizing")                                                         \
2037                                                                             \
2038   product(uintx, MaxRAMFraction, 4,                                         \
2039           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2040           "size")                                                           \
2041           range(1, max_uintx)                                               \
2042                                                                             \
2043   product(uintx, MinRAMFraction, 2,                                         \
2044           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2045           "size on systems with small physical memory size")                \
2046           range(1, max_uintx)                                               \
2047                                                                             \
2048   product(uintx, InitialRAMFraction, 64,                                    \
2049           "Fraction (1/n) of real memory used for initial heap size")       \
2050           range(1, max_uintx)                                               \
2051                                                                             \
2052   develop(uintx, MaxVirtMemFraction, 2,                                     \
2053           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2054           "determining maximum heap size")                                  \
2055                                                                             \
2056   product(bool, UseAdaptiveSizePolicy, true,                                \
2057           "Use adaptive generation sizing policies")                        \
2058                                                                             \
2059   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2060           "Use adaptive survivor sizing policies")                          \
2061                                                                             \
2062   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2063           "Use adaptive young-old sizing policies at minor collections")    \
2064                                                                             \
2065   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2066           "Use adaptive young-old sizing policies at major collections")    \
2067                                                                             \
2068   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2069           "Include statistics from System.gc() for adaptive size policy")   \
2070                                                                             \
2071   product(bool, UseAdaptiveGCBoundary, false,                               \
2072           "Allow young-old boundary to move")                               \
2073                                                                             \
2074   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2075           "Resize the virtual spaces of the young or old generations")      \
2076           range(-1, 1)                                                      \
2077                                                                             \
2078   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2079           "Policy for changing generation size for throughput goals")       \
2080           range(0, 1)                                                       \
2081                                                                             \
2082   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2083           "Number of steps where heuristics is used before data is used")   \
2084           range(0, max_uintx)                                               \
2085                                                                             \
2086   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2087           "Number of collections before the adaptive sizing is started")    \
2088                                                                             \
2089   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2090           "Collection interval for printing information; zero means never") \
2091           range(0, max_uintx)                                               \
2092                                                                             \
2093   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2094           "Use adaptive minimum footprint as a goal")                       \
2095                                                                             \
2096   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2097           "Weight given to exponential resizing, between 0 and 100")        \
2098           range(0, 100)                                                     \
2099                                                                             \
2100   product(uintx, AdaptiveTimeWeight,       25,                              \
2101           "Weight given to time in adaptive policy, between 0 and 100")     \
2102           range(0, 100)                                                     \
2103                                                                             \
2104   product(uintx, PausePadding, 1,                                           \
2105           "How much buffer to keep for pause time")                         \
2106           range(0, max_juint)                                               \
2107                                                                             \
2108   product(uintx, PromotedPadding, 3,                                        \
2109           "How much buffer to keep for promotion failure")                  \
2110           range(0, max_juint)                                               \
2111                                                                             \
2112   product(uintx, SurvivorPadding, 3,                                        \
2113           "How much buffer to keep for survivor overflow")                  \
2114           range(0, max_juint)                                               \
2115                                                                             \
2116   product(uintx, ThresholdTolerance, 10,                                    \
2117           "Allowed collection cost difference between generations")         \
2118           range(0, 100)                                                     \
2119                                                                             \
2120   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2121           "If collection costs are within margin, reduce both by full "     \
2122           "delta")                                                          \
2123           range(0, 100)                                                     \
2124                                                                             \
2125   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2126           "Adaptive size percentage change in young generation")            \
2127           range(0, 100)                                                     \
2128                                                                             \
2129   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2130           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2131           range(0, 100)                                                     \
2132                                                                             \
2133   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2134           "Decay factor to YoungedGenerationSizeSupplement")                \
2135           range(1, max_uintx)                                               \
2136                                                                             \
2137   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2138           "Adaptive size percentage change in tenured generation")          \
2139           range(0, 100)                                                     \
2140                                                                             \
2141   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2142           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2143           range(0, 100)                                                     \
2144                                                                             \
2145   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2146           "Decay factor to TenuredGenerationSizeIncrement")                 \
2147           range(1, max_uintx)                                               \
2148                                                                             \
2149   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2150           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2151           "or (G1 Only) the maximum GC time per MMU time slice")            \
2152           range(1, max_uintx - 1)                                           \
2153           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2154                                                                             \
2155   product(uintx, GCPauseIntervalMillis, 0,                                  \
2156           "Time slice for MMU specification")                               \
2157           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2158                                                                             \
2159   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2160           "Adaptive size policy maximum GC minor pause time goal "          \
2161           "in millisecond")                                                 \
2162           range(0, max_uintx)                                               \
2163                                                                             \
2164   product(uintx, GCTimeRatio, 99,                                           \
2165           "Adaptive size policy application time to GC time ratio")         \
2166           range(0, max_juint)                                               \
2167                                                                             \
2168   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2169           "Adaptive size scale down factor for shrinking")                  \
2170           range(1, max_uintx)                                               \
2171                                                                             \
2172   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2173           "Adaptive size decays the major cost for long major intervals")   \
2174                                                                             \
2175   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2176           "Time scale over which major costs decay")                        \
2177           range(0, max_uintx)                                               \
2178                                                                             \
2179   product(uintx, MinSurvivorRatio, 3,                                       \
2180           "Minimum ratio of young generation/survivor space size")          \
2181           range(3, max_uintx)                                               \
2182                                                                             \
2183   product(uintx, InitialSurvivorRatio, 8,                                   \
2184           "Initial ratio of young generation/survivor space size")          \
2185           range(0, max_uintx)                                               \
2186                                                                             \
2187   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2188           "Estimate of footprint other than Java Heap")                     \
2189           range(0, max_uintx)                                               \
2190                                                                             \
2191   product(bool, UseGCOverheadLimit, true,                                   \
2192           "Use policy to limit of proportion of time spent in GC "          \
2193           "before an OutOfMemory error is thrown")                          \
2194                                                                             \
2195   product(uintx, GCTimeLimit, 98,                                           \
2196           "Limit of the proportion of time spent in GC before "             \
2197           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2198           range(0, 100)                                                     \
2199                                                                             \
2200   product(uintx, GCHeapFreeLimit, 2,                                        \
2201           "Minimum percentage of free space after a full GC before an "     \
2202           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2203           range(0, 100)                                                     \
2204                                                                             \
2205   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2206           "Number of consecutive collections before gc time limit fires")   \
2207           range(1, max_uintx)                                               \
2208                                                                             \
2209   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2210           "How far ahead to prefetch destination area (<= 0 means off)")    \
2211           range(-1, max_jint)                                               \
2212                                                                             \
2213   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2214           "How far ahead to prefetch scan area (<= 0 means off)")           \
2215           range(-1, max_jint)                                               \
2216                                                                             \
2217   product(intx, PrefetchFieldsAhead, -1,                                    \
2218           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2219           range(-1, max_jint)                                               \
2220                                                                             \
2221   diagnostic(bool, VerifyDuringStartup, false,                              \
2222           "Verify memory system before executing any Java code "            \
2223           "during VM initialization")                                       \
2224                                                                             \
2225   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2226           "Verify system before exiting")                                   \
2227                                                                             \
2228   diagnostic(bool, VerifyBeforeGC, false,                                   \
2229           "Verify memory system before GC")                                 \
2230                                                                             \
2231   diagnostic(bool, VerifyAfterGC, false,                                    \
2232           "Verify memory system after GC")                                  \
2233                                                                             \
2234   diagnostic(bool, VerifyDuringGC, false,                                   \
2235           "Verify memory system during GC (between phases)")                \
2236                                                                             \
2237   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2238           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2239           "are enabled. One or more sub-systems can be specified "          \
2240           "in a comma separated string. Sub-systems are: "                  \
2241           "threads, heap, symbol_table, string_table, codecache, "          \
2242           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2243           "codecache_oops")                                                 \
2244                                                                             \
2245   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2246           "Enable parallel memory system verification")                     \
2247                                                                             \
2248   diagnostic(bool, DeferInitialCardMark, false,                             \
2249           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2250           "may arise from new_pre_store_barrier")                           \
2251                                                                             \
2252   product(bool, UseCondCardMark, false,                                     \
2253           "Check for already marked card before updating card table")       \
2254                                                                             \
2255   diagnostic(bool, VerifyRememberedSets, false,                             \
2256           "Verify GC remembered sets")                                      \
2257                                                                             \
2258   diagnostic(bool, VerifyObjectStartArray, true,                            \
2259           "Verify GC object start array if verify before/after")            \
2260                                                                             \
2261   product(bool, DisableExplicitGC, false,                                   \
2262           "Ignore calls to System.gc()")                                    \
2263                                                                             \
2264   notproduct(bool, CheckMemoryInitialization, false,                        \
2265           "Check memory initialization")                                    \
2266                                                                             \
2267   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2268           "Bind CMS Thread to CPU if possible")                             \
2269                                                                             \
2270   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2271           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2272           range(0, max_juint)                                               \
2273                                                                             \
2274   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2275           "Bind GCTaskThreads to CPUs if possible")                         \
2276                                                                             \
2277   product(bool, UseGCTaskAffinity, false,                                   \
2278           "Use worker affinity when asking for GCTasks")                    \
2279                                                                             \
2280   product(uintx, ProcessDistributionStride, 4,                              \
2281           "Stride through processors when distributing processes")          \
2282           range(0, max_juint)                                               \
2283                                                                             \
2284   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2285           "Number of times the coordinator GC thread will sleep while "     \
2286           "yielding before giving up and resuming GC")                      \
2287           range(0, max_juint)                                               \
2288                                                                             \
2289   product(uintx, CMSYieldSleepCount, 0,                                     \
2290           "Number of times a GC thread (minus the coordinator) "            \
2291           "will sleep while yielding before giving up and resuming GC")     \
2292           range(0, max_juint)                                               \
2293                                                                             \
2294   product(bool, PrintGC, false,                                             \
2295           "Print message at garbage collection. "                           \
2296           "Deprecated, use -Xlog:gc instead.")                              \
2297                                                                             \
2298   product(bool, PrintGCDetails, false,                                      \
2299           "Print more details at garbage collection. "                      \
2300           "Deprecated, use -Xlog:gc* instead.")                             \
2301                                                                             \
2302   develop(intx, ConcGCYieldTimeout, 0,                                      \
2303           "If non-zero, assert that GC threads yield within this "          \
2304           "number of milliseconds")                                         \
2305           range(0, max_intx)                                                \
2306                                                                             \
2307   develop(bool, TraceFinalizerRegistration, false,                          \
2308           "Trace registration of final references")                         \
2309                                                                             \
2310   notproduct(bool, TraceScavenge, false,                                    \
2311           "Trace scavenge")                                                 \
2312                                                                             \
2313   product(bool, IgnoreEmptyClassPaths, false,                               \
2314           "Ignore empty path elements in -classpath")                       \
2315                                                                             \
2316   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2317           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2318           "Initial size of the boot class loader data metaspace")           \
2319           range(30*K, max_uintx/BytesPerWord)                               \
2320           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2321                                                                             \
2322   product(bool, TraceYoungGenTime, false,                                   \
2323           "Trace accumulated time for young collection")                    \
2324                                                                             \
2325   product(bool, TraceOldGenTime, false,                                     \
2326           "Trace accumulated time for old collection")                      \
2327                                                                             \
2328   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2329           "Print heap layout in response to SIGBREAK")                      \
2330                                                                             \
2331   manageable(bool, PrintClassHistogram, false,                              \
2332           "Print a histogram of class instances")                           \
2333                                                                             \
2334   develop(bool, TraceGCTaskManager, false,                                  \
2335           "Trace actions of the GC task manager")                           \
2336                                                                             \
2337   develop(bool, TraceGCTaskQueue, false,                                    \
2338           "Trace actions of the GC task queues")                            \
2339                                                                             \
2340   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2341           "Trace marking phase in ParallelOldGC")                           \
2342                                                                             \
2343   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2344           "Trace dense prefix computation for ParallelOldGC")               \
2345                                                                             \
2346   develop(bool, IgnoreLibthreadGPFault, false,                              \
2347           "Suppress workaround for libthread GP fault")                     \
2348                                                                             \
2349   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2350           "The percentage of the used heap that the instances of a class "  \
2351           "must occupy for the class to generate a trace event")            \
2352           range(0.0, 100.0)                                                 \
2353                                                                             \
2354   /* JVMTI heap profiling */                                                \
2355                                                                             \
2356   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2357           "Trace JVMTI object tagging calls")                               \
2358                                                                             \
2359   diagnostic(bool, VerifyBeforeIteration, false,                            \
2360           "Verify memory system before JVMTI iteration")                    \
2361                                                                             \
2362   /* compiler interface */                                                  \
2363                                                                             \
2364   develop(bool, CIPrintCompilerName, false,                                 \
2365           "when CIPrint is active, print the name of the active compiler")  \
2366                                                                             \
2367   diagnostic(bool, CIPrintCompileQueue, false,                              \
2368           "display the contents of the compile queue whenever a "           \
2369           "compilation is enqueued")                                        \
2370                                                                             \
2371   develop(bool, CIPrintRequests, false,                                     \
2372           "display every request for compilation")                          \
2373                                                                             \
2374   product(bool, CITime, false,                                              \
2375           "collect timing information for compilation")                     \
2376                                                                             \
2377   develop(bool, CITimeVerbose, false,                                       \
2378           "be more verbose in compilation timings")                         \
2379                                                                             \
2380   develop(bool, CITimeEach, false,                                          \
2381           "display timing information after each successful compilation")   \
2382                                                                             \
2383   develop(bool, CICountOSR, false,                                          \
2384           "use a separate counter when assigning ids to osr compilations")  \
2385                                                                             \
2386   develop(bool, CICompileNatives, true,                                     \
2387           "compile native methods if supported by the compiler")            \
2388                                                                             \
2389   develop_pd(bool, CICompileOSR,                                            \
2390           "compile on stack replacement methods if supported by the "       \
2391           "compiler")                                                       \
2392                                                                             \
2393   develop(bool, CIPrintMethodCodes, false,                                  \
2394           "print method bytecodes of the compiled code")                    \
2395                                                                             \
2396   develop(bool, CIPrintTypeFlow, false,                                     \
2397           "print the results of ciTypeFlow analysis")                       \
2398                                                                             \
2399   develop(bool, CITraceTypeFlow, false,                                     \
2400           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2401                                                                             \
2402   develop(intx, OSROnlyBCI, -1,                                             \
2403           "OSR only at this bci.  Negative values mean exclude that bci")   \
2404                                                                             \
2405   /* compiler */                                                            \
2406                                                                             \
2407   /* notice: the max range value here is max_jint, not max_intx  */         \
2408   /* because of overflow issue                                   */         \
2409   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2410           "Number of compiler threads to run")                              \
2411           range(0, max_jint)                                                \
2412           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2413                                                                             \
2414   product(intx, CompilationPolicyChoice, 0,                                 \
2415           "which compilation policy (0-3)")                                 \
2416           range(0, 3)                                                       \
2417                                                                             \
2418   develop(bool, UseStackBanging, true,                                      \
2419           "use stack banging for stack overflow checks (required for "      \
2420           "proper StackOverflow handling; disable only to measure cost "    \
2421           "of stackbanging)")                                               \
2422                                                                             \
2423   develop(bool, UseStrictFP, true,                                          \
2424           "use strict fp if modifier strictfp is set")                      \
2425                                                                             \
2426   develop(bool, GenerateSynchronizationCode, true,                          \
2427           "generate locking/unlocking code for synchronized methods and "   \
2428           "monitors")                                                       \
2429                                                                             \
2430   develop(bool, GenerateRangeChecks, true,                                  \
2431           "Generate range checks for array accesses")                       \
2432                                                                             \
2433   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2434           "Generate code for implicit null checks")                         \
2435                                                                             \
2436   product_pd(bool, TrapBasedNullChecks,                                     \
2437           "Generate code for null checks that uses a cmp and trap "         \
2438           "instruction raising SIGTRAP.  This is only used if an access to" \
2439           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2440           "ImplicitNullChecks don't work (PPC64).")                         \
2441                                                                             \
2442   product(bool, PrintSafepointStatistics, false,                            \
2443           "Print statistics about safepoint synchronization")               \
2444                                                                             \
2445   product(intx, PrintSafepointStatisticsCount, 300,                         \
2446           "Total number of safepoint statistics collected "                 \
2447           "before printing them out")                                       \
2448           range(1, max_intx)                                                \
2449                                                                             \
2450   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2451           "Print safepoint statistics only when safepoint takes "           \
2452           "more than PrintSafepointSatisticsTimeout in millis")             \
2453   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2454   NOT_LP64(range(-1, max_intx))                                             \
2455                                                                             \
2456   product(bool, Inline, true,                                               \
2457           "Enable inlining")                                                \
2458                                                                             \
2459   product(bool, ClipInlining, true,                                         \
2460           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2461                                                                             \
2462   develop(bool, UseCHA, true,                                               \
2463           "Enable CHA")                                                     \
2464                                                                             \
2465   product(bool, UseTypeProfile, true,                                       \
2466           "Check interpreter profile for historically monomorphic calls")   \
2467                                                                             \
2468   diagnostic(bool, PrintInlining, false,                                    \
2469           "Print inlining optimizations")                                   \
2470                                                                             \
2471   product(bool, UsePopCountInstruction, false,                              \
2472           "Use population count instruction")                               \
2473                                                                             \
2474   develop(bool, EagerInitialization, false,                                 \
2475           "Eagerly initialize classes if possible")                         \
2476                                                                             \
2477   diagnostic(bool, LogTouchedMethods, false,                                \
2478           "Log methods which have been ever touched in runtime")            \
2479                                                                             \
2480   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2481           "Print all methods that have been ever touched in runtime")       \
2482                                                                             \
2483   develop(bool, TraceMethodReplacement, false,                              \
2484           "Print when methods are replaced do to recompilation")            \
2485                                                                             \
2486   develop(bool, PrintMethodFlushing, false,                                 \
2487           "Print the nmethods being flushed")                               \
2488                                                                             \
2489   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2490           "print statistics about method flushing")                         \
2491                                                                             \
2492   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2493           "Number of compiled code invocations after which "                \
2494           "the method is considered as hot by the flusher")                 \
2495           range(1, max_jint)                                                \
2496                                                                             \
2497   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2498           "Minimum number of sweeper passes before an nmethod "             \
2499           "can be flushed")                                                 \
2500           range(0, max_intx)                                                \
2501                                                                             \
2502   product(bool, UseCodeAging, true,                                         \
2503           "Insert counter to detect warm methods")                          \
2504                                                                             \
2505   diagnostic(bool, StressCodeAging, false,                                  \
2506           "Start with counters compiled in")                                \
2507                                                                             \
2508   develop(bool, StressCodeBuffers, false,                                   \
2509           "Exercise code buffer expansion and other rare state changes")    \
2510                                                                             \
2511   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2512           "Generate extra debugging information for non-safepoints in "     \
2513           "nmethods")                                                       \
2514                                                                             \
2515   product(bool, PrintVMOptions, false,                                      \
2516           "Print flags that appeared on the command line")                  \
2517                                                                             \
2518   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2519           "Ignore unrecognized VM options")                                 \
2520                                                                             \
2521   product(bool, PrintCommandLineFlags, false,                               \
2522           "Print flags specified on command line or set by ergonomics")     \
2523                                                                             \
2524   product(bool, PrintFlagsInitial, false,                                   \
2525           "Print all VM flags before argument processing and exit VM")      \
2526                                                                             \
2527   product(bool, PrintFlagsFinal, false,                                     \
2528           "Print all VM flags after argument and ergonomic processing")     \
2529                                                                             \
2530   notproduct(bool, PrintFlagsWithComments, false,                           \
2531           "Print all VM flags with default values and descriptions and "    \
2532           "exit")                                                           \
2533                                                                             \
2534   product(bool, PrintFlagsRanges, false,                                    \
2535           "Print VM flags and their ranges and exit VM")                    \
2536                                                                             \
2537   diagnostic(bool, SerializeVMOutput, true,                                 \
2538           "Use a mutex to serialize output to tty and LogFile")             \
2539                                                                             \
2540   diagnostic(bool, DisplayVMOutput, true,                                   \
2541           "Display all VM output on the tty, independently of LogVMOutput") \
2542                                                                             \
2543   diagnostic(bool, LogVMOutput, false,                                      \
2544           "Save VM output to LogFile")                                      \
2545                                                                             \
2546   diagnostic(ccstr, LogFile, NULL,                                          \
2547           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2548           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2549                                                                             \
2550   product(ccstr, ErrorFile, NULL,                                           \
2551           "If an error occurs, save the error data to this file "           \
2552           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2553                                                                             \
2554   product(bool, DisplayVMOutputToStderr, false,                             \
2555           "If DisplayVMOutput is true, display all VM output to stderr")    \
2556                                                                             \
2557   product(bool, DisplayVMOutputToStdout, false,                             \
2558           "If DisplayVMOutput is true, display all VM output to stdout")    \
2559                                                                             \
2560   product(bool, UseHeavyMonitors, false,                                    \
2561           "use heavyweight instead of lightweight Java monitors")           \
2562                                                                             \
2563   product(bool, PrintStringTableStatistics, false,                          \
2564           "print statistics about the StringTable and SymbolTable")         \
2565                                                                             \
2566   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2567           "verify StringTable contents at exit")                            \
2568                                                                             \
2569   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2570           "print histogram of the symbol table")                            \
2571                                                                             \
2572   notproduct(bool, ExitVMOnVerifyError, false,                              \
2573           "standard exit from VM if bytecode verify error "                 \
2574           "(only in debug mode)")                                           \
2575                                                                             \
2576   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2577           "Call fatal if this exception is thrown.  Example: "              \
2578           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2579                                                                             \
2580   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2581           "Call fatal if the exception pointed by AbortVMOnException "      \
2582           "has this message")                                               \
2583                                                                             \
2584   develop(bool, DebugVtables, false,                                        \
2585           "add debugging code to vtable dispatch")                          \
2586                                                                             \
2587   notproduct(bool, PrintVtableStats, false,                                 \
2588           "print vtables stats at end of run")                              \
2589                                                                             \
2590   develop(bool, TraceCreateZombies, false,                                  \
2591           "trace creation of zombie nmethods")                              \
2592                                                                             \
2593   notproduct(bool, IgnoreLockingAssertions, false,                          \
2594           "disable locking assertions (for speed)")                         \
2595                                                                             \
2596   product(bool, RangeCheckElimination, true,                                \
2597           "Eliminate range checks")                                         \
2598                                                                             \
2599   develop_pd(bool, UncommonNullCast,                                        \
2600           "track occurrences of null in casts; adjust compiler tactics")    \
2601                                                                             \
2602   develop(bool, TypeProfileCasts,  true,                                    \
2603           "treat casts like calls for purposes of type profiling")          \
2604                                                                             \
2605   develop(bool, DelayCompilationDuringStartup, true,                        \
2606           "Delay invoking the compiler until main application class is "    \
2607           "loaded")                                                         \
2608                                                                             \
2609   develop(bool, CompileTheWorld, false,                                     \
2610           "Compile all methods in all classes in bootstrap class path "     \
2611             "(stress test)")                                                \
2612                                                                             \
2613   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2614           "Preload all classes used by a class before start loading")       \
2615                                                                             \
2616   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2617           "Force a safepoint every n compiles so sweeper can keep up")      \
2618                                                                             \
2619   develop(bool, FillDelaySlots, true,                                       \
2620           "Fill delay slots (on SPARC only)")                               \
2621                                                                             \
2622   develop(bool, TimeLivenessAnalysis, false,                                \
2623           "Time computation of bytecode liveness analysis")                 \
2624                                                                             \
2625   develop(bool, TraceLivenessGen, false,                                    \
2626           "Trace the generation of liveness analysis information")          \
2627                                                                             \
2628   notproduct(bool, TraceLivenessQuery, false,                               \
2629           "Trace queries of liveness analysis information")                 \
2630                                                                             \
2631   notproduct(bool, CollectIndexSetStatistics, false,                        \
2632           "Collect information about IndexSets")                            \
2633                                                                             \
2634   develop(bool, UseLoopSafepoints, true,                                    \
2635           "Generate Safepoint nodes in every loop")                         \
2636                                                                             \
2637   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2638           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2639           "Inline allocations larger than this in doublewords must go slow")\
2640                                                                             \
2641   product(bool, AggressiveOpts, false,                                      \
2642           "Enable aggressive optimizations - see arguments.cpp")            \
2643                                                                             \
2644   product_pd(bool, CompactStrings,                                          \
2645           "Enable Strings to use single byte chars in backing store")       \
2646                                                                             \
2647   product_pd(uintx, TypeProfileLevel,                                       \
2648           "=XYZ, with Z: Type profiling of arguments at call; "             \
2649                      "Y: Type profiling of return value at call; "          \
2650                      "X: Type profiling of parameters to methods; "         \
2651           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2652           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2653                                                                             \
2654   product(intx, TypeProfileArgsLimit,     2,                                \
2655           "max number of call arguments to consider for type profiling")    \
2656           range(0, 16)                                                      \
2657                                                                             \
2658   product(intx, TypeProfileParmsLimit,    2,                                \
2659           "max number of incoming parameters to consider for type profiling"\
2660           ", -1 for all")                                                   \
2661           range(-1, 64)                                                     \
2662                                                                             \
2663   /* statistics */                                                          \
2664   develop(bool, CountCompiledCalls, false,                                  \
2665           "Count method invocations")                                       \
2666                                                                             \
2667   notproduct(bool, CountRuntimeCalls, false,                                \
2668           "Count VM runtime calls")                                         \
2669                                                                             \
2670   develop(bool, CountJNICalls, false,                                       \
2671           "Count jni method invocations")                                   \
2672                                                                             \
2673   notproduct(bool, CountJVMCalls, false,                                    \
2674           "Count jvm method invocations")                                   \
2675                                                                             \
2676   notproduct(bool, CountRemovableExceptions, false,                         \
2677           "Count exceptions that could be replaced by branches due to "     \
2678           "inlining")                                                       \
2679                                                                             \
2680   notproduct(bool, ICMissHistogram, false,                                  \
2681           "Produce histogram of IC misses")                                 \
2682                                                                             \
2683   /* interpreter */                                                         \
2684   product_pd(bool, RewriteBytecodes,                                        \
2685           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2686                                                                             \
2687   product_pd(bool, RewriteFrequentPairs,                                    \
2688           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2689                                                                             \
2690   diagnostic(bool, PrintInterpreter, false,                                 \
2691           "Print the generated interpreter code")                           \
2692                                                                             \
2693   product(bool, UseInterpreter, true,                                       \
2694           "Use interpreter for non-compiled methods")                       \
2695                                                                             \
2696   develop(bool, UseFastSignatureHandlers, true,                             \
2697           "Use fast signature handlers for native calls")                   \
2698                                                                             \
2699   product(bool, UseLoopCounter, true,                                       \
2700           "Increment invocation counter on backward branch")                \
2701                                                                             \
2702   product_pd(bool, UseOnStackReplacement,                                   \
2703           "Use on stack replacement, calls runtime if invoc. counter "      \
2704           "overflows in loop")                                              \
2705                                                                             \
2706   notproduct(bool, TraceOnStackReplacement, false,                          \
2707           "Trace on stack replacement")                                     \
2708                                                                             \
2709   product_pd(bool, PreferInterpreterNativeStubs,                            \
2710           "Use always interpreter stubs for native methods invoked via "    \
2711           "interpreter")                                                    \
2712                                                                             \
2713   develop(bool, CountBytecodes, false,                                      \
2714           "Count number of bytecodes executed")                             \
2715                                                                             \
2716   develop(bool, PrintBytecodeHistogram, false,                              \
2717           "Print histogram of the executed bytecodes")                      \
2718                                                                             \
2719   develop(bool, PrintBytecodePairHistogram, false,                          \
2720           "Print histogram of the executed bytecode pairs")                 \
2721                                                                             \
2722   diagnostic(bool, PrintSignatureHandlers, false,                           \
2723           "Print code generated for native method signature handlers")      \
2724                                                                             \
2725   develop(bool, VerifyOops, false,                                          \
2726           "Do plausibility checks for oops")                                \
2727                                                                             \
2728   develop(bool, CheckUnhandledOops, false,                                  \
2729           "Check for unhandled oops in VM code")                            \
2730                                                                             \
2731   develop(bool, VerifyJNIFields, trueInDebug,                               \
2732           "Verify jfieldIDs for instance fields")                           \
2733                                                                             \
2734   notproduct(bool, VerifyJNIEnvThread, false,                               \
2735           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2736           "from JNI")                                                       \
2737                                                                             \
2738   develop(bool, VerifyFPU, false,                                           \
2739           "Verify FPU state (check for NaN's, etc.)")                       \
2740                                                                             \
2741   develop(bool, VerifyThread, false,                                        \
2742           "Watch the thread register for corruption (SPARC only)")          \
2743                                                                             \
2744   develop(bool, VerifyActivationFrameSize, false,                           \
2745           "Verify that activation frame didn't become smaller than its "    \
2746           "minimal size")                                                   \
2747                                                                             \
2748   develop(bool, TraceFrequencyInlining, false,                              \
2749           "Trace frequency based inlining")                                 \
2750                                                                             \
2751   develop_pd(bool, InlineIntrinsics,                                        \
2752           "Inline intrinsics that can be statically resolved")              \
2753                                                                             \
2754   product_pd(bool, ProfileInterpreter,                                      \
2755           "Profile at the bytecode level during interpretation")            \
2756                                                                             \
2757   develop(bool, TraceProfileInterpreter, false,                             \
2758           "Trace profiling at the bytecode level during interpretation. "   \
2759           "This outputs the profiling information collected to improve "    \
2760           "jit compilation.")                                               \
2761                                                                             \
2762   develop_pd(bool, ProfileTraps,                                            \
2763           "Profile deoptimization traps at the bytecode level")             \
2764                                                                             \
2765   product(intx, ProfileMaturityPercentage, 20,                              \
2766           "number of method invocations/branches (expressed as % of "       \
2767           "CompileThreshold) before using the method's profile")            \
2768           range(0, 100)                                                     \
2769                                                                             \
2770   diagnostic(bool, PrintMethodData, false,                                  \
2771           "Print the results of +ProfileInterpreter at end of run")         \
2772                                                                             \
2773   develop(bool, VerifyDataPointer, trueInDebug,                             \
2774           "Verify the method data pointer during interpreter profiling")    \
2775                                                                             \
2776   develop(bool, VerifyCompiledCode, false,                                  \
2777           "Include miscellaneous runtime verifications in nmethod code; "   \
2778           "default off because it disturbs nmethod size heuristics")        \
2779                                                                             \
2780   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2781           "Manually make GC thread crash then dump java stack trace;  "     \
2782           "Test only")                                                      \
2783                                                                             \
2784   /* compilation */                                                         \
2785   product(bool, UseCompiler, true,                                          \
2786           "Use Just-In-Time compilation")                                   \
2787                                                                             \
2788   develop(bool, TraceCompilationPolicy, false,                              \
2789           "Trace compilation policy")                                       \
2790                                                                             \
2791   develop(bool, TimeCompilationPolicy, false,                               \
2792           "Time the compilation policy")                                    \
2793                                                                             \
2794   product(bool, UseCounterDecay, true,                                      \
2795           "Adjust recompilation counters")                                  \
2796                                                                             \
2797   develop(intx, CounterHalfLifeTime,    30,                                 \
2798           "Half-life time of invocation counters (in seconds)")             \
2799                                                                             \
2800   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2801           "The minimum interval (in milliseconds) between invocation of "   \
2802           "CounterDecay")                                                   \
2803                                                                             \
2804   product(bool, AlwaysCompileLoopMethods, false,                            \
2805           "When using recompilation, never interpret methods "              \
2806           "containing loops")                                               \
2807                                                                             \
2808   product(bool, DontCompileHugeMethods, true,                               \
2809           "Do not compile methods > HugeMethodLimit")                       \
2810                                                                             \
2811   /* Bytecode escape analysis estimation. */                                \
2812   product(bool, EstimateArgEscape, true,                                    \
2813           "Analyze bytecodes to estimate escape state of arguments")        \
2814                                                                             \
2815   product(intx, BCEATraceLevel, 0,                                          \
2816           "How much tracing to do of bytecode escape analysis estimates "   \
2817           "(0-3)")                                                          \
2818           range(0, 3)                                                       \
2819                                                                             \
2820   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2821           "Maximum number of nested calls that are analyzed by BC EA")      \
2822           range(0, max_jint)                                                \
2823                                                                             \
2824   product(intx, MaxBCEAEstimateSize, 150,                                   \
2825           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2826           range(0, max_jint)                                                \
2827                                                                             \
2828   product(intx,  AllocatePrefetchStyle, 1,                                  \
2829           "0 = no prefetch, "                                               \
2830           "1 = generate prefetch instructions for each allocation, "        \
2831           "2 = use TLAB watermark to gate allocation prefetch, "            \
2832           "3 = generate one prefetch instruction per cache line")           \
2833           range(0, 3)                                                       \
2834                                                                             \
2835   product(intx,  AllocatePrefetchDistance, -1,                              \
2836           "Distance to prefetch ahead of allocation pointer. "              \
2837           "-1: use system-specific value (automatically determined")        \
2838           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2839                                                                             \
2840   product(intx,  AllocatePrefetchLines, 3,                                  \
2841           "Number of lines to prefetch ahead of array allocation pointer")  \
2842           range(1, 64)                                                      \
2843                                                                             \
2844   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2845           "Number of lines to prefetch ahead of instance allocation "       \
2846           "pointer")                                                        \
2847           range(1, 64)                                                      \
2848                                                                             \
2849   product(intx,  AllocatePrefetchStepSize, 16,                              \
2850           "Step size in bytes of sequential prefetch instructions")         \
2851           range(1, 512)                                                     \
2852           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2853                                                                             \
2854   product(intx,  AllocatePrefetchInstr, 0,                                  \
2855           "Select instruction to prefetch ahead of allocation pointer")     \
2856           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2857                                                                             \
2858   /* deoptimization */                                                      \
2859   develop(bool, TraceDeoptimization, false,                                 \
2860           "Trace deoptimization")                                           \
2861                                                                             \
2862   develop(bool, PrintDeoptimizationDetails, false,                          \
2863           "Print more information about deoptimization")                    \
2864                                                                             \
2865   develop(bool, DebugDeoptimization, false,                                 \
2866           "Tracing various information while debugging deoptimization")     \
2867                                                                             \
2868   product(intx, SelfDestructTimer, 0,                                       \
2869           "Will cause VM to terminate after a given time (in minutes) "     \
2870           "(0 means off)")                                                  \
2871           range(0, max_intx)                                                \
2872                                                                             \
2873   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2874           "The maximum number of lines in the stack trace for Java "        \
2875           "exceptions (0 means all)")                                       \
2876           range(0, max_jint/2)                                              \
2877                                                                             \
2878   /* notice: the max range value here is max_jint, not max_intx  */         \
2879   /* because of overflow issue                                   */         \
2880   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2881           "Guarantee a safepoint (at least) every so many milliseconds "    \
2882           "(0 means none)")                                                 \
2883           range(0, max_jint)                                                \
2884                                                                             \
2885   product(intx, SafepointTimeoutDelay, 10000,                               \
2886           "Delay in milliseconds for option SafepointTimeout")              \
2887   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2888   NOT_LP64(range(0, max_intx))                                              \
2889                                                                             \
2890   product(intx, NmethodSweepActivity, 10,                                   \
2891           "Removes cold nmethods from code cache if > 0. Higher values "    \
2892           "result in more aggressive sweeping")                             \
2893           range(0, 2000)                                                    \
2894                                                                             \
2895   notproduct(bool, LogSweeper, false,                                       \
2896           "Keep a ring buffer of sweeper activity")                         \
2897                                                                             \
2898   notproduct(intx, SweeperLogEntries, 1024,                                 \
2899           "Number of records in the ring buffer of sweeper activity")       \
2900                                                                             \
2901   notproduct(intx, MemProfilingInterval, 500,                               \
2902           "Time between each invocation of the MemProfiler")                \
2903                                                                             \
2904   develop(intx, MallocCatchPtr, -1,                                         \
2905           "Hit breakpoint when mallocing/freeing this pointer")             \
2906                                                                             \
2907   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2908           "List of assertions (file:line) to muzzle")                       \
2909                                                                             \
2910   develop(intx, StackPrintLimit, 100,                                       \
2911           "number of stack frames to print in VM-level stack dump")         \
2912                                                                             \
2913   notproduct(intx, MaxElementPrintSize, 256,                                \
2914           "maximum number of elements to print")                            \
2915                                                                             \
2916   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2917           "maximum number of subklasses to print when printing klass")      \
2918                                                                             \
2919   product(intx, MaxInlineLevel, 9,                                          \
2920           "maximum number of nested calls that are inlined")                \
2921           range(0, max_jint)                                                \
2922                                                                             \
2923   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2924           "maximum number of nested recursive calls that are inlined")      \
2925           range(0, max_jint)                                                \
2926                                                                             \
2927   develop(intx, MaxForceInlineLevel, 100,                                   \
2928           "maximum number of nested calls that are forced for inlining "    \
2929           "(using CompileCommand or marked w/ @ForceInline)")               \
2930           range(0, max_jint)                                                \
2931                                                                             \
2932   product_pd(intx, InlineSmallCode,                                         \
2933           "Only inline already compiled methods if their code size is "     \
2934           "less than this")                                                 \
2935           range(0, max_jint)                                                \
2936                                                                             \
2937   product(intx, MaxInlineSize, 35,                                          \
2938           "The maximum bytecode size of a method to be inlined")            \
2939           range(0, max_jint)                                                \
2940                                                                             \
2941   product_pd(intx, FreqInlineSize,                                          \
2942           "The maximum bytecode size of a frequent method to be inlined")   \
2943           range(0, max_jint)                                                \
2944                                                                             \
2945   product(intx, MaxTrivialSize, 6,                                          \
2946           "The maximum bytecode size of a trivial method to be inlined")    \
2947           range(0, max_jint)                                                \
2948                                                                             \
2949   product(intx, MinInliningThreshold, 250,                                  \
2950           "The minimum invocation count a method needs to have to be "      \
2951           "inlined")                                                        \
2952           range(0, max_jint)                                                \
2953                                                                             \
2954   develop(intx, MethodHistogramCutoff, 100,                                 \
2955           "The cutoff value for method invocation histogram (+CountCalls)") \
2956                                                                             \
2957   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2958           "Number of interpreted methods to show in profile")               \
2959                                                                             \
2960   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2961           "Number of compiled methods to show in profile")                  \
2962                                                                             \
2963   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2964           "Number of stub methods to show in profile")                      \
2965                                                                             \
2966   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2967           "Number of runtime stub nodes to show in profile")                \
2968                                                                             \
2969   product(intx, ProfileIntervalsTicks, 100,                                 \
2970           "Number of ticks between printing of interval profile "           \
2971           "(+ProfileIntervals)")                                            \
2972           range(0, max_intx)                                                \
2973                                                                             \
2974   notproduct(intx, ScavengeALotInterval,     1,                             \
2975           "Interval between which scavenge will occur with +ScavengeALot")  \
2976                                                                             \
2977   notproduct(intx, FullGCALotInterval,     1,                               \
2978           "Interval between which full gc will occur with +FullGCALot")     \
2979                                                                             \
2980   notproduct(intx, FullGCALotStart,     0,                                  \
2981           "For which invocation to start FullGCAlot")                       \
2982                                                                             \
2983   notproduct(intx, FullGCALotDummies,  32*K,                                \
2984           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2985           "to move")                                                        \
2986                                                                             \
2987   develop(intx, DontYieldALotInterval,    10,                               \
2988           "Interval between which yields will be dropped (milliseconds)")   \
2989                                                                             \
2990   develop(intx, ProfilerPCTickThreshold,    15,                             \
2991           "Number of ticks in a PC buckets to be a hotspot")                \
2992                                                                             \
2993   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2994           "Number of exits until DeoptimizeALot kicks in")                  \
2995                                                                             \
2996   notproduct(intx, ZombieALotInterval,     5,                               \
2997           "Number of exits until ZombieALot kicks in")                      \
2998                                                                             \
2999   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3000           "If non-zero, maximum number of words that malloc/realloc can "   \
3001           "allocate (for testing only)")                                    \
3002           range(0, max_uintx)                                               \
3003                                                                             \
3004   product(intx, TypeProfileWidth, 2,                                        \
3005           "Number of receiver types to record in call/cast profile")        \
3006           range(0, 8)                                                       \
3007                                                                             \
3008   develop(intx, BciProfileWidth,      2,                                    \
3009           "Number of return bci's to record in ret profile")                \
3010                                                                             \
3011   product(intx, PerMethodRecompilationCutoff, 400,                          \
3012           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3013           range(-1, max_intx)                                               \
3014                                                                             \
3015   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3016           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3017           range(-1, max_intx)                                               \
3018                                                                             \
3019   product(intx, PerMethodTrapLimit,  100,                                   \
3020           "Limit on traps (of one kind) in a method (includes inlines)")    \
3021           range(0, max_jint)                                                \
3022                                                                             \
3023   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3024           "Limit on speculative traps (of one kind) in a method "           \
3025           "(includes inlines)")                                             \
3026           range(0, max_jint)                                                \
3027                                                                             \
3028   product(intx, PerBytecodeTrapLimit,  4,                                   \
3029           "Limit on traps (of one kind) at a particular BCI")               \
3030           range(0, max_jint)                                                \
3031                                                                             \
3032   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3033           "Extra method data trap entries for speculation")                 \
3034                                                                             \
3035   develop(intx, InlineFrequencyRatio,    20,                                \
3036           "Ratio of call site execution to caller method invocation")       \
3037           range(0, max_jint)                                                \
3038                                                                             \
3039   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3040           "Count of call site execution necessary to trigger frequent "     \
3041           "inlining")                                                       \
3042           range(0, max_jint)                                                \
3043                                                                             \
3044   develop(intx, InlineThrowCount,    50,                                    \
3045           "Force inlining of interpreted methods that throw this often")    \
3046           range(0, max_jint)                                                \
3047                                                                             \
3048   develop(intx, InlineThrowMaxSize,   200,                                  \
3049           "Force inlining of throwing methods smaller than this")           \
3050           range(0, max_jint)                                                \
3051                                                                             \
3052   develop(intx, ProfilerNodeSize,  1024,                                    \
3053           "Size in K to allocate for the Profile Nodes of each thread")     \
3054           range(0, 1024)                                                    \
3055                                                                             \
3056   /* gc parameters */                                                       \
3057   product(size_t, InitialHeapSize, 0,                                       \
3058           "Initial heap size (in bytes); zero means use ergonomics")        \
3059           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3060                                                                             \
3061   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3062           "Maximum heap size (in bytes)")                                   \
3063           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3064                                                                             \
3065   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3066           "Initial tenured generation size (in bytes)")                     \
3067           range(0, max_uintx)                                               \
3068                                                                             \
3069   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3070           "Initial new generation size (in bytes)")                         \
3071           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3072                                                                             \
3073   product(size_t, MaxNewSize, max_uintx,                                    \
3074           "Maximum new generation size (in bytes), max_uintx means set "    \
3075           "ergonomically")                                                  \
3076           range(0, max_uintx)                                               \
3077                                                                             \
3078   product_pd(size_t, HeapBaseMinAddress,                                    \
3079           "OS specific low limit for heap base address")                    \
3080           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3081                                                                             \
3082   product(size_t, PretenureSizeThreshold, 0,                                \
3083           "Maximum size in bytes of objects allocated in DefNew "           \
3084           "generation; zero means no maximum")                              \
3085           range(0, max_uintx)                                               \
3086                                                                             \
3087   product(size_t, MinTLABSize, 2*K,                                         \
3088           "Minimum allowed TLAB size (in bytes)")                           \
3089           range(1, max_uintx/2)                                             \
3090           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3091                                                                             \
3092   product(size_t, TLABSize, 0,                                              \
3093           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3094           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3095                                                                             \
3096   product(size_t, YoungPLABSize, 4096,                                      \
3097           "Size of young gen promotion LAB's (in HeapWords)")               \
3098           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3099                                                                             \
3100   product(size_t, OldPLABSize, 1024,                                        \
3101           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3102           "of blocks to attempt to claim when refilling CMS LAB's")         \
3103           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3104                                                                             \
3105   product(uintx, TLABAllocationWeight, 35,                                  \
3106           "Allocation averaging weight")                                    \
3107           range(0, 100)                                                     \
3108                                                                             \
3109   /* Limit the lower bound of this flag to 1 as it is used  */              \
3110   /* in a division expression.                              */              \
3111   product(uintx, TLABWasteTargetPercent, 1,                                 \
3112           "Percentage of Eden that can be wasted")                          \
3113           range(1, 100)                                                     \
3114                                                                             \
3115   product(uintx, TLABRefillWasteFraction,    64,                            \
3116           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3117           range(1, max_juint)                                               \
3118                                                                             \
3119   product(uintx, TLABWasteIncrement,    4,                                  \
3120           "Increment allowed waste at slow allocation")                     \
3121           range(0, max_jint)                                                \
3122           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3123                                                                             \
3124   product(uintx, SurvivorRatio, 8,                                          \
3125           "Ratio of eden/survivor space size")                              \
3126           range(1, max_uintx-2)                                             \
3127           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3128                                                                             \
3129   product(uintx, NewRatio, 2,                                               \
3130           "Ratio of old/new generation sizes")                              \
3131           range(0, max_uintx-1)                                             \
3132                                                                             \
3133   product_pd(size_t, NewSizeThreadIncrease,                                 \
3134           "Additional size added to desired new generation size per "       \
3135           "non-daemon thread (in bytes)")                                   \
3136           range(0, max_uintx)                                               \
3137                                                                             \
3138   product_pd(size_t, MetaspaceSize,                                         \
3139           "Initial threshold (in bytes) at which a garbage collection "     \
3140           "is done to reduce Metaspace usage")                              \
3141           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3142                                                                             \
3143   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3144           "Maximum size of Metaspaces (in bytes)")                          \
3145           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3146                                                                             \
3147   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3148           "Maximum size of class area in Metaspace when compressed "        \
3149           "class pointers are used")                                        \
3150           range(1*M, 3*G)                                                   \
3151                                                                             \
3152   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3153           "The minimum percentage of heap free after GC to avoid expansion."\
3154           " For most GCs this applies to the old generation. In G1 and"     \
3155           " ParallelGC it applies to the whole heap.")                      \
3156           range(0, 100)                                                     \
3157           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3158                                                                             \
3159   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3160           "The maximum percentage of heap free after GC to avoid shrinking."\
3161           " For most GCs this applies to the old generation. In G1 and"     \
3162           " ParallelGC it applies to the whole heap.")                      \
3163           range(0, 100)                                                     \
3164           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3165                                                                             \
3166   product(bool, ShrinkHeapInSteps, true,                                    \
3167           "When disabled, informs the GC to shrink the java heap directly"  \
3168           " to the target size at the next full GC rather than requiring"   \
3169           " smaller steps during multiple full GCs.")                       \
3170                                                                             \
3171   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3172           "Number of milliseconds per MB of free space in the heap")        \
3173           range(0, max_intx)                                                \
3174           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3175                                                                             \
3176   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3177           "The minimum change in heap space due to GC (in bytes)")          \
3178           range(0, max_uintx)                                               \
3179                                                                             \
3180   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3181           "The minimum expansion of Metaspace (in bytes)")                  \
3182           range(0, max_uintx)                                               \
3183                                                                             \
3184   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3185           "The maximum percentage of Metaspace free after GC to avoid "     \
3186           "shrinking")                                                      \
3187           range(0, 100)                                                     \
3188           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3189                                                                             \
3190   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3191           "The minimum percentage of Metaspace free after GC to avoid "     \
3192           "expansion")                                                      \
3193           range(0, 99)                                                      \
3194           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3195                                                                             \
3196   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3197           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3198           range(0, max_uintx)                                               \
3199                                                                             \
3200   product(uintx, QueuedAllocationWarningCount, 0,                           \
3201           "Number of times an allocation that queues behind a GC "          \
3202           "will retry before printing a warning")                           \
3203           range(0, max_uintx)                                               \
3204                                                                             \
3205   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3206           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3207           range(0, max_uintx)                                               \
3208                                                                             \
3209   diagnostic(intx, VerifyGCLevel,     0,                                    \
3210           "Generation level at which to start +VerifyBefore/AfterGC")       \
3211           range(0, 1)                                                       \
3212                                                                             \
3213   product(uintx, MaxTenuringThreshold,    15,                               \
3214           "Maximum value for tenuring threshold")                           \
3215           range(0, markOopDesc::max_age + 1)                                \
3216           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3217                                                                             \
3218   product(uintx, InitialTenuringThreshold,    7,                            \
3219           "Initial value for tenuring threshold")                           \
3220           range(0, markOopDesc::max_age + 1)                                \
3221           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3222                                                                             \
3223   product(uintx, TargetSurvivorRatio,    50,                                \
3224           "Desired percentage of survivor space used after scavenge")       \
3225           range(0, 100)                                                     \
3226                                                                             \
3227   product(uintx, MarkSweepDeadRatio,     5,                                 \
3228           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3229           "Serial mark sweep treats this as both the minimum and maximum "  \
3230           "value. "                                                         \
3231           "CMS uses this value only if it falls back to mark sweep. "       \
3232           "Par compact uses a variable scale based on the density of the "  \
3233           "generation and treats this as the maximum value when the heap "  \
3234           "is either completely full or completely empty.  Par compact "    \
3235           "also has a smaller default value; see arguments.cpp.")           \
3236           range(0, 100)                                                     \
3237                                                                             \
3238   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3239           "How often should we fully compact the heap (ignoring the dead "  \
3240           "space parameters)")                                              \
3241           range(1, max_juint)                                               \
3242                                                                             \
3243   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3244           "Delay between expansion and allocation (in milliseconds)")       \
3245                                                                             \
3246   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3247           "Delay in scheduling GC workers (in milliseconds)")               \
3248                                                                             \
3249   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3250           "(Unstable) Number of times to iterate in safepoint loop "        \
3251           "before blocking VM threads ")                                    \
3252           range(-1, max_jint-1)                                             \
3253                                                                             \
3254   product(intx, DeferPollingPageLoopCount,     -1,                          \
3255           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3256           "before changing safepoint polling page to RO ")                  \
3257           range(-1, max_jint-1)                                             \
3258                                                                             \
3259   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3260           range(0, max_intx)                                                \
3261                                                                             \
3262   product(bool, PSChunkLargeArrays, true,                                   \
3263           "Process large arrays in chunks")                                 \
3264                                                                             \
3265   product(uintx, GCDrainStackTargetSize, 64,                                \
3266           "Number of entries we will try to leave on the stack "            \
3267           "during parallel gc")                                             \
3268           range(0, max_juint)                                               \
3269                                                                             \
3270   /* stack parameters */                                                    \
3271   product_pd(intx, StackYellowPages,                                        \
3272           "Number of yellow zone (recoverable overflows) pages of size "    \
3273           "4KB. If pages are bigger yellow zone is aligned up.")            \
3274           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3275                                                                             \
3276   product_pd(intx, StackRedPages,                                           \
3277           "Number of red zone (unrecoverable overflows) pages of size "     \
3278           "4KB. If pages are bigger red zone is aligned up.")               \
3279           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3280                                                                             \
3281   product_pd(intx, StackReservedPages,                                      \
3282           "Number of reserved zone (reserved to annotated methods) pages"   \
3283           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3284           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3285                                                                             \
3286   product(bool, RestrictReservedStack, true,                                \
3287           "Restrict @ReservedStackAccess to trusted classes")               \
3288                                                                             \
3289   /* greater stack shadow pages can't generate instruction to bang stack */ \
3290   product_pd(intx, StackShadowPages,                                        \
3291           "Number of shadow zone (for overflow checking) pages of size "    \
3292           "4KB. If pages are bigger shadow zone is aligned up. "            \
3293           "This should exceed the depth of the VM and native call stack.")  \
3294           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3295                                                                             \
3296   product_pd(intx, ThreadStackSize,                                         \
3297           "Thread Stack Size (in Kbytes)")                                  \
3298           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3299                                                                             \
3300   product_pd(intx, VMThreadStackSize,                                       \
3301           "Non-Java Thread Stack Size (in Kbytes)")                         \
3302           range(0, max_intx/(1 * K))                                        \
3303                                                                             \
3304   product_pd(intx, CompilerThreadStackSize,                                 \
3305           "Compiler Thread Stack Size (in Kbytes)")                         \
3306           range(0, max_intx/(1 * K))                                        \
3307                                                                             \
3308   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3309           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3310                                                                             \
3311   /* code cache parameters                                    */            \
3312   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3313           "Code cache segment size (in bytes) - smallest unit of "          \
3314           "allocation")                                                     \
3315           range(1, 1024)                                                    \
3316           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3317                                                                             \
3318   develop_pd(intx, CodeEntryAlignment,                                      \
3319           "Code entry alignment for generated code (in bytes)")             \
3320           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3321                                                                             \
3322   product_pd(intx, OptoLoopAlignment,                                       \
3323           "Align inner loops to zero relative to this modulus")             \
3324           range(1, 16)                                                      \
3325           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3326                                                                             \
3327   product_pd(uintx, InitialCodeCacheSize,                                   \
3328           "Initial code cache size (in bytes)")                             \
3329           range(0, max_uintx)                                               \
3330                                                                             \
3331   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3332           "Minimum code cache size (in bytes) required to start VM.")       \
3333           range(0, max_uintx)                                               \
3334                                                                             \
3335   product(bool, SegmentedCodeCache, false,                                  \
3336           "Use a segmented code cache")                                     \
3337                                                                             \
3338   product_pd(uintx, ReservedCodeCacheSize,                                  \
3339           "Reserved code cache size (in bytes) - maximum code cache size")  \
3340           range(0, max_uintx)                                               \
3341                                                                             \
3342   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3343           "Size of code heap with non-profiled methods (in bytes)")         \
3344           range(0, max_uintx)                                               \
3345                                                                             \
3346   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3347           "Size of code heap with profiled methods (in bytes)")             \
3348           range(0, max_uintx)                                               \
3349                                                                             \
3350   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3351           "Size of code heap with non-nmethods (in bytes)")                 \
3352           range(0, max_uintx)                                               \
3353                                                                             \
3354   product_pd(uintx, CodeCacheExpansionSize,                                 \
3355           "Code cache expansion size (in bytes)")                           \
3356           range(0, max_uintx)                                               \
3357                                                                             \
3358   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3359           "Minimum number of segments in a code cache block")               \
3360           range(1, 100)                                                     \
3361                                                                             \
3362   notproduct(bool, ExitOnFullCodeCache, false,                              \
3363           "Exit the VM if we fill the code cache")                          \
3364                                                                             \
3365   product(bool, UseCodeCacheFlushing, true,                                 \
3366           "Remove cold/old nmethods from the code cache")                   \
3367                                                                             \
3368   product(uintx, StartAggressiveSweepingAt, 10,                             \
3369           "Start aggressive sweeping if X[%] of the code cache is free."    \
3370           "Segmented code cache: X[%] of the non-profiled heap."            \
3371           "Non-segmented code cache: X[%] of the total code cache")         \
3372           range(0, 100)                                                     \
3373                                                                             \
3374   /* AOT parameters */                                                      \
3375   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3376           "Use AOT compiled files")                                         \
3377                                                                             \
3378   product(ccstrlist, AOTLibrary, NULL,                                      \
3379           "AOT library")                                                    \
3380                                                                             \
3381   product(bool, PrintAOT, false,                                            \
3382           "Print used AOT klasses and methods")                             \
3383                                                                             \
3384   notproduct(bool, PrintAOTStatistics, false,                               \
3385           "Print AOT statistics")                                           \
3386                                                                             \
3387   diagnostic(bool, UseAOTStrictLoading, false,                              \
3388           "Exit the VM if any of the AOT libraries has invalid config")     \
3389                                                                             \
3390   product(bool, CalculateClassFingerprint, false,                           \
3391           "Calculate class fingerprint")                                    \
3392                                                                             \
3393   /* interpreter debugging */                                               \
3394   develop(intx, BinarySwitchThreshold, 5,                                   \
3395           "Minimal number of lookupswitch entries for rewriting to binary " \
3396           "switch")                                                         \
3397                                                                             \
3398   develop(intx, StopInterpreterAt, 0,                                       \
3399           "Stop interpreter execution at specified bytecode number")        \
3400                                                                             \
3401   develop(intx, TraceBytecodesAt, 0,                                        \
3402           "Trace bytecodes starting with specified bytecode number")        \
3403                                                                             \
3404   /* compiler interface */                                                  \
3405   develop(intx, CIStart, 0,                                                 \
3406           "The id of the first compilation to permit")                      \
3407                                                                             \
3408   develop(intx, CIStop, max_jint,                                           \
3409           "The id of the last compilation to permit")                       \
3410                                                                             \
3411   develop(intx, CIStartOSR, 0,                                              \
3412           "The id of the first osr compilation to permit "                  \
3413           "(CICountOSR must be on)")                                        \
3414                                                                             \
3415   develop(intx, CIStopOSR, max_jint,                                        \
3416           "The id of the last osr compilation to permit "                   \
3417           "(CICountOSR must be on)")                                        \
3418                                                                             \
3419   develop(intx, CIBreakAtOSR, -1,                                           \
3420           "The id of osr compilation to break at")                          \
3421                                                                             \
3422   develop(intx, CIBreakAt, -1,                                              \
3423           "The id of compilation to break at")                              \
3424                                                                             \
3425   product(ccstrlist, CompileOnly, "",                                       \
3426           "List of methods (pkg/class.name) to restrict compilation to")    \
3427                                                                             \
3428   product(ccstr, CompileCommandFile, NULL,                                  \
3429           "Read compiler commands from this file [.hotspot_compiler]")      \
3430                                                                             \
3431   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3432           "Read compiler directives from this file")                        \
3433                                                                             \
3434   product(ccstrlist, CompileCommand, "",                                    \
3435           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3436                                                                             \
3437   develop(bool, ReplayCompiles, false,                                      \
3438           "Enable replay of compilations from ReplayDataFile")              \
3439                                                                             \
3440   product(ccstr, ReplayDataFile, NULL,                                      \
3441           "File containing compilation replay information"                  \
3442           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3443                                                                             \
3444    product(ccstr, InlineDataFile, NULL,                                     \
3445           "File containing inlining replay information"                     \
3446           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3447                                                                             \
3448   develop(intx, ReplaySuppressInitializers, 2,                              \
3449           "Control handling of class initialization during replay: "        \
3450           "0 - don't do anything special; "                                 \
3451           "1 - treat all class initializers as empty; "                     \
3452           "2 - treat class initializers for application classes as empty; " \
3453           "3 - allow all class initializers to run during bootstrap but "   \
3454           "    pretend they are empty after starting replay")               \
3455           range(0, 3)                                                       \
3456                                                                             \
3457   develop(bool, ReplayIgnoreInitErrors, false,                              \
3458           "Ignore exceptions thrown during initialization for replay")      \
3459                                                                             \
3460   product(bool, DumpReplayDataOnError, true,                                \
3461           "Record replay data for crashing compiler threads")               \
3462                                                                             \
3463   product(bool, CICompilerCountPerCPU, false,                               \
3464           "1 compiler thread for log(N CPUs)")                              \
3465                                                                             \
3466   develop(intx, CIFireOOMAt,    -1,                                         \
3467           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3468           "(non-negative value throws OOM after this many CI accesses "     \
3469           "in each compile)")                                               \
3470   notproduct(intx, CICrashAt, -1,                                           \
3471           "id of compilation to trigger assert in compiler thread for "     \
3472           "the purpose of testing, e.g. generation of replay data")         \
3473   notproduct(bool, CIObjectFactoryVerify, false,                            \
3474           "enable potentially expensive verification in ciObjectFactory")   \
3475                                                                             \
3476   /* Priorities */                                                          \
3477   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3478                                                                             \
3479   product(intx, ThreadPriorityPolicy, 0,                                    \
3480           "0 : Normal.                                                     "\
3481           "    VM chooses priorities that are appropriate for normal       "\
3482           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3483           "    to normal native priority. Java priorities below "           \
3484           "    NORM_PRIORITY map to lower native priority values. On       "\
3485           "    Windows applications are allowed to use higher native       "\
3486           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3487           "    not use the highest possible native priority,               "\
3488           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3489           "    system threads. On Linux thread priorities are ignored      "\
3490           "    because the OS does not support static priority in          "\
3491           "    SCHED_OTHER scheduling class which is the only choice for   "\
3492           "    non-root, non-realtime applications.                        "\
3493           "1 : Aggressive.                                                 "\
3494           "    Java thread priorities map over to the entire range of      "\
3495           "    native thread priorities. Higher Java thread priorities map "\
3496           "    to higher native thread priorities. This policy should be   "\
3497           "    used with care, as sometimes it can cause performance       "\
3498           "    degradation in the application and/or the entire system. On "\
3499           "    Linux this policy requires root privilege.")                 \
3500           range(0, 1)                                                       \
3501                                                                             \
3502   product(bool, ThreadPriorityVerbose, false,                               \
3503           "Print priority changes")                                         \
3504                                                                             \
3505   product(intx, CompilerThreadPriority, -1,                                 \
3506           "The native priority at which compiler threads should run "       \
3507           "(-1 means no change)")                                           \
3508           range(min_jint, max_jint)                                         \
3509           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3510                                                                             \
3511   product(intx, VMThreadPriority, -1,                                       \
3512           "The native priority at which the VM thread should run "          \
3513           "(-1 means no change)")                                           \
3514           range(-1, 127)                                                    \
3515                                                                             \
3516   product(bool, CompilerThreadHintNoPreempt, true,                          \
3517           "(Solaris only) Give compiler threads an extra quanta")           \
3518                                                                             \
3519   product(bool, VMThreadHintNoPreempt, false,                               \
3520           "(Solaris only) Give VM thread an extra quanta")                  \
3521                                                                             \
3522   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3523           "Map Java priorities to OS priorities")                           \
3524           range(-1, 127)                                                    \
3525                                                                             \
3526   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3527           "Map Java priorities to OS priorities")                           \
3528           range(-1, 127)                                                    \
3529                                                                             \
3530   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3531           "Map Java priorities to OS priorities")                           \
3532           range(-1, 127)                                                    \
3533                                                                             \
3534   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3535           "Map Java priorities to OS priorities")                           \
3536           range(-1, 127)                                                    \
3537                                                                             \
3538   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3539           "Map Java priorities to OS priorities")                           \
3540           range(-1, 127)                                                    \
3541                                                                             \
3542   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3543           "Map Java priorities to OS priorities")                           \
3544           range(-1, 127)                                                    \
3545                                                                             \
3546   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3547           "Map Java priorities to OS priorities")                           \
3548           range(-1, 127)                                                    \
3549                                                                             \
3550   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552           range(-1, 127)                                                    \
3553                                                                             \
3554   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3555           "Map Java priorities to OS priorities")                           \
3556           range(-1, 127)                                                    \
3557                                                                             \
3558   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3559           "Map Java priorities to OS priorities")                           \
3560           range(-1, 127)                                                    \
3561                                                                             \
3562   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3563           "Java thread priority 10 maps to critical scheduling priority")   \
3564                                                                             \
3565   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3566           "Compiler thread(s) run at critical scheduling priority")         \
3567                                                                             \
3568   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3569           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3570                                                                             \
3571   /* compiler debugging */                                                  \
3572   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3573           "First class to consider when using +CompileTheWorld")            \
3574                                                                             \
3575   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3576           "Last class to consider when using +CompileTheWorld")             \
3577                                                                             \
3578   develop(intx, NewCodeParameter,      0,                                   \
3579           "Testing Only: Create a dedicated integer parameter before "      \
3580           "putback")                                                        \
3581                                                                             \
3582   /* new oopmap storage allocation */                                       \
3583   develop(intx, MinOopMapAllocation,     8,                                 \
3584           "Minimum number of OopMap entries in an OopMapSet")               \
3585                                                                             \
3586   /* Background Compilation */                                              \
3587   develop(intx, LongCompileThreshold,     50,                               \
3588           "Used with +TraceLongCompiles")                                   \
3589                                                                             \
3590   /* recompilation */                                                       \
3591   product_pd(intx, CompileThreshold,                                        \
3592           "number of interpreted method invocations before (re-)compiling") \
3593           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3594                                                                             \
3595   product(double, CompileThresholdScaling, 1.0,                             \
3596           "Factor to control when first compilation happens "               \
3597           "(both with and without tiered compilation): "                    \
3598           "values greater than 1.0 delay counter overflow, "                \
3599           "values between 0 and 1.0 rush counter overflow, "                \
3600           "value of 1.0 leaves compilation thresholds unchanged "           \
3601           "value of 0.0 is equivalent to -Xint. "                           \
3602           ""                                                                \
3603           "Flag can be set as per-method option. "                          \
3604           "If a value is specified for a method, compilation thresholds "   \
3605           "for that method are scaled by both the value of the global flag "\
3606           "and the value of the per-method flag.")                          \
3607           range(0.0, DBL_MAX)                                               \
3608                                                                             \
3609   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3610           "Interpreter (tier 0) invocation notification frequency")         \
3611           range(0, 30)                                                      \
3612                                                                             \
3613   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3614           "C1 without MDO (tier 2) invocation notification frequency")      \
3615           range(0, 30)                                                      \
3616                                                                             \
3617   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3618           "C1 with MDO profiling (tier 3) invocation notification "         \
3619           "frequency")                                                      \
3620           range(0, 30)                                                      \
3621                                                                             \
3622   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3623           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3624           range(0, 30)                                                      \
3625                                                                             \
3626   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3627           "Interpreter (tier 0) invocation notification frequency")         \
3628           range(0, 30)                                                      \
3629                                                                             \
3630   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3631           "C1 without MDO (tier 2) invocation notification frequency")      \
3632           range(0, 30)                                                      \
3633                                                                             \
3634   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3635           "C1 with MDO profiling (tier 3) invocation notification "         \
3636           "frequency")                                                      \
3637           range(0, 30)                                                      \
3638                                                                             \
3639   product(intx, Tier2CompileThreshold, 0,                                   \
3640           "threshold at which tier 2 compilation is invoked")               \
3641           range(0, max_jint)                                                \
3642                                                                             \
3643   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3644           "Back edge threshold at which tier 2 compilation is invoked")     \
3645           range(0, max_jint)                                                \
3646                                                                             \
3647   product(intx, Tier3InvocationThreshold, 200,                              \
3648           "Compile if number of method invocations crosses this "           \
3649           "threshold")                                                      \
3650           range(0, max_jint)                                                \
3651                                                                             \
3652   product(intx, Tier3MinInvocationThreshold, 100,                           \
3653           "Minimum invocation to compile at tier 3")                        \
3654           range(0, max_jint)                                                \
3655                                                                             \
3656   product(intx, Tier3CompileThreshold, 2000,                                \
3657           "Threshold at which tier 3 compilation is invoked (invocation "   \
3658           "minimum must be satisfied)")                                     \
3659           range(0, max_jint)                                                \
3660                                                                             \
3661   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3662           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3663           range(0, max_jint)                                                \
3664                                                                             \
3665   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3666           "Compile if number of method invocations crosses this "           \
3667           "threshold if coming from AOT")                                   \
3668           range(0, max_jint)                                                \
3669                                                                             \
3670   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3671           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3672           range(0, max_jint)                                                \
3673                                                                             \
3674   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3675           "Threshold at which tier 3 compilation is invoked (invocation "   \
3676           "minimum must be satisfied) if coming from AOT")                  \
3677           range(0, max_jint)                                                \
3678                                                                             \
3679   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3680           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3681           "if coming from AOT")                                             \
3682           range(0, max_jint)                                                \
3683                                                                             \
3684   product(intx, Tier4InvocationThreshold, 5000,                             \
3685           "Compile if number of method invocations crosses this "           \
3686           "threshold")                                                      \
3687           range(0, max_jint)                                                \
3688                                                                             \
3689   product(intx, Tier4MinInvocationThreshold, 600,                           \
3690           "Minimum invocation to compile at tier 4")                        \
3691           range(0, max_jint)                                                \
3692                                                                             \
3693   product(intx, Tier4CompileThreshold, 15000,                               \
3694           "Threshold at which tier 4 compilation is invoked (invocation "   \
3695           "minimum must be satisfied")                                      \
3696           range(0, max_jint)                                                \
3697                                                                             \
3698   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3699           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3700           range(0, max_jint)                                                \
3701                                                                             \
3702   product(intx, Tier3DelayOn, 5,                                            \
3703           "If C2 queue size grows over this amount per compiler thread "    \
3704           "stop compiling at tier 3 and start compiling at tier 2")         \
3705           range(0, max_jint)                                                \
3706                                                                             \
3707   product(intx, Tier3DelayOff, 2,                                           \
3708           "If C2 queue size is less than this amount per compiler thread "  \
3709           "allow methods compiled at tier 2 transition to tier 3")          \
3710           range(0, max_jint)                                                \
3711                                                                             \
3712   product(intx, Tier3LoadFeedback, 5,                                       \
3713           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3714           "reaches this amount per compiler thread")                        \
3715           range(0, max_jint)                                                \
3716                                                                             \
3717   product(intx, Tier4LoadFeedback, 3,                                       \
3718           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3719           "reaches this amount per compiler thread")                        \
3720           range(0, max_jint)                                                \
3721                                                                             \
3722   product(intx, TieredCompileTaskTimeout, 50,                               \
3723           "Kill compile task if method was not used within "                \
3724           "given timeout in milliseconds")                                  \
3725           range(0, max_intx)                                                \
3726                                                                             \
3727   product(intx, TieredStopAtLevel, 4,                                       \
3728           "Stop at given compilation level")                                \
3729           range(0, 4)                                                       \
3730                                                                             \
3731   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3732           "Start profiling in interpreter if the counters exceed tier 3 "   \
3733           "thresholds by the specified percentage")                         \
3734           range(0, max_jint)                                                \
3735                                                                             \
3736   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3737           "Increase the compile threshold for C1 compilation if the code "  \
3738           "cache is filled by the specified percentage")                    \
3739           range(0, 99)                                                      \
3740                                                                             \
3741   product(intx, TieredRateUpdateMinTime, 1,                                 \
3742           "Minimum rate sampling interval (in milliseconds)")               \
3743           range(0, max_intx)                                                \
3744                                                                             \
3745   product(intx, TieredRateUpdateMaxTime, 25,                                \
3746           "Maximum rate sampling interval (in milliseconds)")               \
3747           range(0, max_intx)                                                \
3748                                                                             \
3749   product_pd(bool, TieredCompilation,                                       \
3750           "Enable tiered compilation")                                      \
3751                                                                             \
3752   product(bool, PrintTieredEvents, false,                                   \
3753           "Print tiered events notifications")                              \
3754                                                                             \
3755   product_pd(intx, OnStackReplacePercentage,                                \
3756           "NON_TIERED number of method invocations/branches (expressed as " \
3757           "% of CompileThreshold) before (re-)compiling OSR code")          \
3758           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3759                                                                             \
3760   product(intx, InterpreterProfilePercentage, 33,                           \
3761           "NON_TIERED number of method invocations/branches (expressed as " \
3762           "% of CompileThreshold) before profiling in the interpreter")     \
3763           range(0, 100)                                                     \
3764                                                                             \
3765   develop(intx, MaxRecompilationSearchLength,    10,                        \
3766           "The maximum number of frames to inspect when searching for "     \
3767           "recompilee")                                                     \
3768                                                                             \
3769   develop(intx, MaxInterpretedSearchLength,     3,                          \
3770           "The maximum number of interpreted frames to skip when searching "\
3771           "for recompilee")                                                 \
3772                                                                             \
3773   develop(intx, DesiredMethodLimit,  8000,                                  \
3774           "The desired maximum method size (in bytecodes) after inlining")  \
3775                                                                             \
3776   develop(intx, HugeMethodLimit,  8000,                                     \
3777           "Don't compile methods larger than this if "                      \
3778           "+DontCompileHugeMethods")                                        \
3779                                                                             \
3780   /* New JDK 1.4 reflection implementation */                               \
3781                                                                             \
3782   develop(intx, FastSuperclassLimit, 8,                                     \
3783           "Depth of hardwired instanceof accelerator array")                \
3784                                                                             \
3785   /* Properties for Java libraries  */                                      \
3786                                                                             \
3787   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3788           "Maximum total size of NIO direct-buffer allocations")            \
3789           range(0, max_jlong)                                               \
3790                                                                             \
3791   /* Flags used for temporary code during development  */                   \
3792                                                                             \
3793   diagnostic(bool, UseNewCode, false,                                       \
3794           "Testing Only: Use the new version while testing")                \
3795                                                                             \
3796   diagnostic(bool, UseNewCode2, false,                                      \
3797           "Testing Only: Use the new version while testing")                \
3798                                                                             \
3799   diagnostic(bool, UseNewCode3, false,                                      \
3800           "Testing Only: Use the new version while testing")                \
3801                                                                             \
3802   /* flags for performance data collection */                               \
3803                                                                             \
3804   product(bool, UsePerfData, true,                                          \
3805           "Flag to disable jvmstat instrumentation for performance testing "\
3806           "and problem isolation purposes")                                 \
3807                                                                             \
3808   product(bool, PerfDataSaveToFile, false,                                  \
3809           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3810                                                                             \
3811   product(ccstr, PerfDataSaveFile, NULL,                                    \
3812           "Save PerfData memory to the specified absolute pathname. "       \
3813           "The string %p in the file name (if present) "                    \
3814           "will be replaced by pid")                                        \
3815                                                                             \
3816   product(intx, PerfDataSamplingInterval, 50,                               \
3817           "Data sampling interval (in milliseconds)")                       \
3818           range(PeriodicTask::min_interval, max_jint)                       \
3819           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3820                                                                             \
3821   product(bool, PerfDisableSharedMem, false,                                \
3822           "Store performance data in standard memory")                      \
3823                                                                             \
3824   product(intx, PerfDataMemorySize, 32*K,                                   \
3825           "Size of performance data memory region. Will be rounded "        \
3826           "up to a multiple of the native os page size.")                   \
3827           range(128, 32*64*K)                                               \
3828                                                                             \
3829   product(intx, PerfMaxStringConstLength, 1024,                             \
3830           "Maximum PerfStringConstant string length before truncation")     \
3831           range(32, 32*K)                                                   \
3832                                                                             \
3833   product(bool, PerfAllowAtExitRegistration, false,                         \
3834           "Allow registration of atexit() methods")                         \
3835                                                                             \
3836   product(bool, PerfBypassFileSystemCheck, false,                           \
3837           "Bypass Win32 file system criteria checks (Windows Only)")        \
3838                                                                             \
3839   product(intx, UnguardOnExecutionViolation, 0,                             \
3840           "Unguard page and retry on no-execute fault (Win32 only) "        \
3841           "0=off, 1=conservative, 2=aggressive")                            \
3842           range(0, 2)                                                       \
3843                                                                             \
3844   /* Serviceability Support */                                              \
3845                                                                             \
3846   product(bool, ManagementServer, false,                                    \
3847           "Create JMX Management Server")                                   \
3848                                                                             \
3849   product(bool, DisableAttachMechanism, false,                              \
3850           "Disable mechanism that allows tools to attach to this VM")       \
3851                                                                             \
3852   product(bool, StartAttachListener, false,                                 \
3853           "Always start Attach Listener at VM startup")                     \
3854                                                                             \
3855   product(bool, EnableDynamicAgentLoading, true,                            \
3856           "Allow tools to load agents with the attach mechanism")           \
3857                                                                             \
3858   manageable(bool, PrintConcurrentLocks, false,                             \
3859           "Print java.util.concurrent locks in thread dump")                \
3860                                                                             \
3861   product(bool, TransmitErrorReport, false,                                 \
3862           "Enable error report transmission on erroneous termination")      \
3863                                                                             \
3864   product(ccstr, ErrorReportServer, NULL,                                   \
3865           "Override built-in error report server address")                  \
3866                                                                             \
3867   /* Shared spaces */                                                       \
3868                                                                             \
3869   product(bool, UseSharedSpaces, true,                                      \
3870           "Use shared spaces for metadata")                                 \
3871                                                                             \
3872   product(bool, VerifySharedSpaces, false,                                  \
3873           "Verify shared spaces (false for default archive, true for "      \
3874           "archive specified by -XX:SharedArchiveFile)")                    \
3875                                                                             \
3876   product(bool, RequireSharedSpaces, false,                                 \
3877           "Require shared spaces for metadata")                             \
3878                                                                             \
3879   product(bool, DumpSharedSpaces, false,                                    \
3880           "Special mode: JVM reads a class list, loads classes, builds "    \
3881           "shared spaces, and dumps the shared spaces to a file to be "     \
3882           "used in future JVM runs")                                        \
3883                                                                             \
3884   product(bool, PrintSharedArchiveAndExit, false,                           \
3885           "Print shared archive file contents")                             \
3886                                                                             \
3887   product(bool, PrintSharedDictionary, false,                               \
3888           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3889           "dictionary")                                                     \
3890                                                                             \
3891   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3892           "Size of read-write space for metadata (in bytes)")               \
3893           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3894           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3895                                                                             \
3896   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3897           "Size of read-only space for metadata (in bytes)")                \
3898           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3899           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3900                                                                             \
3901   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3902           "Size of the shared miscellaneous data area (in bytes)")          \
3903           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3904           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3905                                                                             \
3906   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3907           "Size of the shared miscellaneous code area (in bytes)")          \
3908           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3909           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3910                                                                             \
3911   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3912           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3913           "Address to allocate shared memory region for class data")        \
3914           range(0, SIZE_MAX)                                                \
3915                                                                             \
3916   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3917           "Average number of symbols per bucket in shared table")           \
3918           range(2, 246)                                                     \
3919                                                                             \
3920   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3921           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3922           "classes. Just exclude them from the shared dictionary.")         \
3923                                                                             \
3924   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3925           "Print generated stub code for method handles")                   \
3926                                                                             \
3927   develop(bool, TraceMethodHandles, false,                                  \
3928           "trace internal method handle operations")                        \
3929                                                                             \
3930   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3931           "perform extra checks when constructing method handles")          \
3932                                                                             \
3933   diagnostic(bool, ShowHiddenFrames, false,                                 \
3934           "show method handle implementation frames (usually hidden)")      \
3935                                                                             \
3936   experimental(bool, TrustFinalNonStaticFields, false,                      \
3937           "trust final non-static declarations for constant folding")       \
3938                                                                             \
3939   diagnostic(bool, FoldStableValues, true,                                  \
3940           "Optimize loads from stable fields (marked w/ @Stable)")          \
3941                                                                             \
3942   develop(bool, TraceInvokeDynamic, false,                                  \
3943           "trace internal invoke dynamic operations")                       \
3944                                                                             \
3945   diagnostic(bool, PauseAtStartup,      false,                              \
3946           "Causes the VM to pause at startup time and wait for the pause "  \
3947           "file to be removed (default: ./vm.paused.<pid>)")                \
3948                                                                             \
3949   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3950           "The file to create and for whose removal to await when pausing " \
3951           "at startup. (default: ./vm.paused.<pid>)")                       \
3952                                                                             \
3953   diagnostic(bool, PauseAtExit, false,                                      \
3954           "Pause and wait for keypress on exit if a debugger is attached")  \
3955                                                                             \
3956   product(bool, ExtendedDTraceProbes,    false,                             \
3957           "Enable performance-impacting dtrace probes")                     \
3958                                                                             \
3959   product(bool, DTraceMethodProbes, false,                                  \
3960           "Enable dtrace probes for method-entry and method-exit")          \
3961                                                                             \
3962   product(bool, DTraceAllocProbes, false,                                   \
3963           "Enable dtrace probes for object allocation")                     \
3964                                                                             \
3965   product(bool, DTraceMonitorProbes, false,                                 \
3966           "Enable dtrace probes for monitor events")                        \
3967                                                                             \
3968   product(bool, RelaxAccessControlCheck, false,                             \
3969           "Relax the access control checks in the verifier")                \
3970                                                                             \
3971   product(uintx, StringTableSize, defaultStringTableSize,                   \
3972           "Number of buckets in the interned String table")                 \
3973           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3974                                                                             \
3975   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3976           "Number of buckets in the JVM internal Symbol table")             \
3977           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3978                                                                             \
3979   product(bool, UseStringDeduplication, false,                              \
3980           "Use string deduplication")                                       \
3981                                                                             \
3982   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3983           "A string must reach this age (or be promoted to an old region) " \
3984           "to be considered for deduplication")                             \
3985           range(1, markOopDesc::max_age)                                    \
3986                                                                             \
3987   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3988           "Force table resize every time the table is scanned")             \
3989                                                                             \
3990   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3991           "Force table rehash every time the table is scanned")             \
3992                                                                             \
3993   diagnostic(bool, WhiteBoxAPI, false,                                      \
3994           "Enable internal testing APIs")                                   \
3995                                                                             \
3996   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3997            "Default survivor space alignment in bytes")                     \
3998            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
3999                                                                             \
4000   product(bool , AllowNonVirtualCalls, false,                               \
4001           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4002                                                                             \
4003   product(ccstr, DumpLoadedClassList, NULL,                                 \
4004           "Dump the names all loaded classes, that could be stored into "   \
4005           "the CDS archive, in the specified file")                         \
4006                                                                             \
4007   product(ccstr, SharedClassListFile, NULL,                                 \
4008           "Override the default CDS class list")                            \
4009                                                                             \
4010   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4011           "Override the default location of the CDS archive file")          \
4012                                                                             \
4013   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4014           "Extra classlist for building the CDS archive file")              \
4015                                                                             \
4016   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4017           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4018           "Allocation less than this value will be allocated "              \
4019           "using malloc. Larger allocations will use mmap.")                \
4020                                                                             \
4021   experimental(bool, AlwaysAtomicAccesses, false,                           \
4022           "Accesses to all variables should always be atomic")              \
4023                                                                             \
4024   product(bool, EnableTracing, false,                                       \
4025           "Enable event-based tracing")                                     \
4026                                                                             \
4027   product(bool, UseLockedTracing, false,                                    \
4028           "Use locked-tracing when doing event-based tracing")              \
4029                                                                             \
4030   diagnostic(bool, UseUnalignedAccesses, false,                             \
4031           "Use unaligned memory accesses in Unsafe")                        \
4032                                                                             \
4033   product_pd(bool, PreserveFramePointer,                                    \
4034              "Use the FP register for holding the frame pointer "           \
4035              "and not as a general purpose register.")                      \
4036                                                                             \
4037   diagnostic(bool, CheckIntrinsics, true,                                   \
4038              "When a class C is loaded, check that "                        \
4039              "(1) all intrinsics defined by the VM for class C are present "\
4040              "in the loaded class file and are marked with the "            \
4041              "@HotSpotIntrinsicCandidate annotation, that "                 \
4042              "(2) there is an intrinsic registered for all loaded methods " \
4043              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4044              "annotation, and that "                                        \
4045              "(3) no orphan methods exist for class C (i.e., methods for "  \
4046              "which the VM declares an intrinsic but that are not declared "\
4047              "in the loaded class C. "                                      \
4048              "Check (3) is available only in debug builds.")                \
4049                                                                             \
4050   diagnostic_pd(intx, InitArrayShortSize,                                   \
4051           "Threshold small size (in bytes) for clearing arrays. "           \
4052           "Anything this size or smaller may get converted to discrete "    \
4053           "scalar stores.")                                                 \
4054           range(0, max_intx)                                                \
4055           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4056                                                                             \
4057   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4058              "Disable backwards compatibility for compile commands.")       \
4059                                                                             \
4060   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4061              "Print compiler directives on installation.")                  \
4062   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4063              "Limit on number of compiler directives.")
4064 
4065 
4066 /*
4067  *  Macros for factoring of globals
4068  */
4069 
4070 // Interface macros
4071 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4072 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4073 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4074 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4075 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4076 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4077 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4078 #ifdef PRODUCT
4079 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4080 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4081 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4082 #else
4083 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4084 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4085 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4086 #endif // PRODUCT
4087 // Special LP64 flags, product only needed for now.
4088 #ifdef _LP64
4089 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4090 #else
4091 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4092 #endif // _LP64
4093 
4094 // Implementation macros
4095 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4096 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4097 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4098 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4099 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4100 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4101 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4102 #ifdef PRODUCT
4103 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4104 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4105 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4106 #else
4107 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4108 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4109 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4110 #endif // PRODUCT
4111 #ifdef _LP64
4112 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4113 #else
4114 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4115 #endif // _LP64
4116 
4117 // Only materialize src code for range checking when required, ignore otherwise
4118 #define IGNORE_RANGE(a, b)
4119 // Only materialize src code for contraint checking when required, ignore otherwise
4120 #define IGNORE_CONSTRAINT(func,type)
4121 
4122 #define IGNORE_WRITEABLE(type)
4123 
4124 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4125               DECLARE_PD_DEVELOPER_FLAG, \
4126               DECLARE_PRODUCT_FLAG, \
4127               DECLARE_PD_PRODUCT_FLAG, \
4128               DECLARE_DIAGNOSTIC_FLAG, \
4129               DECLARE_PD_DIAGNOSTIC_FLAG, \
4130               DECLARE_EXPERIMENTAL_FLAG, \
4131               DECLARE_NOTPRODUCT_FLAG, \
4132               DECLARE_MANAGEABLE_FLAG, \
4133               DECLARE_PRODUCT_RW_FLAG, \
4134               DECLARE_LP64_PRODUCT_FLAG, \
4135               IGNORE_RANGE, \
4136               IGNORE_CONSTRAINT, \
4137               IGNORE_WRITEABLE)
4138 
4139 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4140                  DECLARE_PD_DEVELOPER_FLAG, \
4141                  DECLARE_PRODUCT_FLAG, \
4142                  DECLARE_PD_PRODUCT_FLAG, \
4143                  DECLARE_DIAGNOSTIC_FLAG, \
4144                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4145                  DECLARE_NOTPRODUCT_FLAG, \
4146                  IGNORE_RANGE, \
4147                  IGNORE_CONSTRAINT, \
4148                  IGNORE_WRITEABLE)
4149 
4150 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4151            DECLARE_PRODUCT_FLAG, \
4152            DECLARE_DIAGNOSTIC_FLAG, \
4153            DECLARE_EXPERIMENTAL_FLAG, \
4154            DECLARE_NOTPRODUCT_FLAG, \
4155            IGNORE_RANGE, \
4156            IGNORE_CONSTRAINT, \
4157            IGNORE_WRITEABLE)
4158 
4159 // Extensions
4160 
4161 #include "runtime/globals_ext.hpp"
4162 
4163 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP