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/debug.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 #include <float.h> // for DBL_MAX
  32 
  33 // use this for flags that are true per default in the tiered build
  34 // but false in non-tiered builds, and vice versa
  35 #ifdef TIERED
  36 #define  trueInTiered true
  37 #define falseInTiered false
  38 #else
  39 #define  trueInTiered false
  40 #define falseInTiered true
  41 #endif
  42 
  43 #include CPU_HEADER(globals)
  44 #include OS_HEADER(globals)
  45 #include OS_CPU_HEADER(globals)
  46 #ifdef COMPILER1
  47 #include CPU_HEADER(c1_globals)
  48 #include OS_HEADER(c1_globals)
  49 #endif
  50 #ifdef COMPILER2
  51 #include CPU_HEADER(c2_globals)
  52 #include OS_HEADER(c2_globals)
  53 #endif
  54 #ifdef SHARK
  55 #ifdef ZERO
  56 # include "shark_globals_zero.hpp"
  57 #endif
  58 #endif
  59 
  60 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
  61 define_pd_global(bool, BackgroundCompilation,        false);
  62 define_pd_global(bool, UseTLAB,                      false);
  63 define_pd_global(bool, CICompileOSR,                 false);
  64 define_pd_global(bool, UseTypeProfile,               false);
  65 define_pd_global(bool, UseOnStackReplacement,        false);
  66 define_pd_global(bool, InlineIntrinsics,             false);
  67 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  68 define_pd_global(bool, ProfileInterpreter,           false);
  69 define_pd_global(bool, ProfileTraps,                 false);
  70 define_pd_global(bool, TieredCompilation,            false);
  71 
  72 define_pd_global(intx, CompileThreshold,             0);
  73 
  74 define_pd_global(intx, OnStackReplacePercentage,     0);
  75 define_pd_global(bool, ResizeTLAB,                   false);
  76 define_pd_global(intx, FreqInlineSize,               0);
  77 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  78 define_pd_global(intx, InlineClassNatives,           true);
  79 define_pd_global(intx, InlineUnsafeOps,              true);
  80 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  81 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  82 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
  83 define_pd_global(intx, ProfiledCodeHeapSize,         0);
  84 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
  85 
  86 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  87 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  88 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
  89 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  90 define_pd_global(bool, NeverActAsServerClassMachine, true);
  91 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
  92 #define CI_COMPILER_COUNT 0
  93 #else
  94 
  95 #if defined(COMPILER2) || INCLUDE_JVMCI
  96 #define CI_COMPILER_COUNT 2
  97 #else
  98 #define CI_COMPILER_COUNT 1
  99 #endif // COMPILER2 || INCLUDE_JVMCI
 100 
 101 #endif // no compilers
 102 
 103 // string type aliases used only in this file
 104 typedef const char* ccstr;
 105 typedef const char* ccstrlist;   // represents string arguments which accumulate
 106 
 107 // function type that will construct default range string
 108 typedef const char* (*RangeStrFunc)(void);
 109 
 110 struct Flag {
 111   enum Flags {
 112     // latest value origin
 113     DEFAULT          = 0,
 114     COMMAND_LINE     = 1,
 115     ENVIRON_VAR      = 2,
 116     CONFIG_FILE      = 3,
 117     MANAGEMENT       = 4,
 118     ERGONOMIC        = 5,
 119     ATTACH_ON_DEMAND = 6,
 120     INTERNAL         = 7,
 121 
 122     LAST_VALUE_ORIGIN = INTERNAL,
 123     VALUE_ORIGIN_BITS = 4,
 124     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 125 
 126     // flag kind
 127     KIND_PRODUCT            = 1 << 4,
 128     KIND_MANAGEABLE         = 1 << 5,
 129     KIND_DIAGNOSTIC         = 1 << 6,
 130     KIND_EXPERIMENTAL       = 1 << 7,
 131     KIND_NOT_PRODUCT        = 1 << 8,
 132     KIND_DEVELOP            = 1 << 9,
 133     KIND_PLATFORM_DEPENDENT = 1 << 10,
 134     KIND_READ_WRITE         = 1 << 11,
 135     KIND_C1                 = 1 << 12,
 136     KIND_C2                 = 1 << 13,
 137     KIND_ARCH               = 1 << 14,
 138     KIND_SHARK              = 1 << 15,
 139     KIND_LP64_PRODUCT       = 1 << 16,
 140     KIND_COMMERCIAL         = 1 << 17,
 141     KIND_JVMCI              = 1 << 18,
 142 
 143     // set this bit if the flag was set on the command line
 144     ORIG_COMMAND_LINE       = 1 << 19,
 145 
 146     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 147   };
 148 
 149   enum Error {
 150     // no error
 151     SUCCESS = 0,
 152     // flag name is missing
 153     MISSING_NAME,
 154     // flag value is missing
 155     MISSING_VALUE,
 156     // error parsing the textual form of the value
 157     WRONG_FORMAT,
 158     // flag is not writable
 159     NON_WRITABLE,
 160     // flag value is outside of its bounds
 161     OUT_OF_BOUNDS,
 162     // flag value violates its constraint
 163     VIOLATES_CONSTRAINT,
 164     // there is no flag with the given name
 165     INVALID_FLAG,
 166     // the flag can only be set only on command line during invocation of the VM
 167     COMMAND_LINE_ONLY,
 168     // the flag may only be set once
 169     SET_ONLY_ONCE,
 170     // the flag is not writable in this combination of product/debug build
 171     CONSTANT,
 172     // other, unspecified error related to setting the flag
 173     ERR_OTHER
 174   };
 175 
 176   enum MsgType {
 177     NONE = 0,
 178     DIAGNOSTIC_FLAG_BUT_LOCKED,
 179     EXPERIMENTAL_FLAG_BUT_LOCKED,
 180     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 181     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 182   };
 183 
 184   const char* _type;
 185   const char* _name;
 186   void* _addr;
 187   NOT_PRODUCT(const char* _doc;)
 188   Flags _flags;
 189   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 debug.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 debug.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, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1188                "Experimental Sync flags")                                   \
1189                                                                             \
1190   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1191                                                                             \
1192   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1193                                                                             \
1194   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1195                                                                             \
1196   experimental(intx, hashCode, 5,                                           \
1197                "(Unstable) select hashCode generation algorithm")           \
1198                                                                             \
1199   product(bool, FilterSpuriousWakeups, true,                                \
1200           "When true prevents OS-level spurious, or premature, wakeups "    \
1201           "from Object.wait (Ignored for Windows)")                         \
1202                                                                             \
1203   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1204                                                                             \
1205   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1206                                                                             \
1207   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1208                                                                             \
1209   develop(bool, UsePthreads, false,                                         \
1210           "Use pthread-based instead of libthread-based synchronization "   \
1211           "(SPARC only)")                                                   \
1212                                                                             \
1213   product(bool, ReduceSignalUsage, false,                                   \
1214           "Reduce the use of OS signals in Java and/or the VM")             \
1215                                                                             \
1216   develop_pd(bool, ShareVtableStubs,                                        \
1217           "Share vtable stubs (smaller code but worse branch prediction")   \
1218                                                                             \
1219   develop(bool, LoadLineNumberTables, true,                                 \
1220           "Tell whether the class file parser loads line number tables")    \
1221                                                                             \
1222   develop(bool, LoadLocalVariableTables, true,                              \
1223           "Tell whether the class file parser loads local variable tables") \
1224                                                                             \
1225   develop(bool, LoadLocalVariableTypeTables, true,                          \
1226           "Tell whether the class file parser loads local variable type"    \
1227           "tables")                                                         \
1228                                                                             \
1229   product(bool, AllowUserSignalHandlers, false,                             \
1230           "Do not complain if the application installs signal handlers "    \
1231           "(Solaris & Linux only)")                                         \
1232                                                                             \
1233   product(bool, UseSignalChaining, true,                                    \
1234           "Use signal-chaining to invoke signal handlers installed "        \
1235           "by the application (Solaris & Linux only)")                      \
1236                                                                             \
1237   product(bool, AllowJNIEnvProxy, false,                                    \
1238           "Allow JNIEnv proxies for jdbx")                                  \
1239                                                                             \
1240   product(bool, RestoreMXCSROnJNICalls, false,                              \
1241           "Restore MXCSR when returning from JNI calls")                    \
1242                                                                             \
1243   product(bool, CheckJNICalls, false,                                       \
1244           "Verify all arguments to JNI calls")                              \
1245                                                                             \
1246   product(bool, CheckEndorsedAndExtDirs, false,                             \
1247           "Verify the endorsed and extension directories are not used")     \
1248                                                                             \
1249   product(bool, UseFastJNIAccessors, true,                                  \
1250           "Use optimized versions of Get<Primitive>Field")                  \
1251                                                                             \
1252   product(intx, MaxJNILocalCapacity, 65536,                                 \
1253           "Maximum allowable local JNI handle capacity to "                 \
1254           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1255           "where <= 0 is unlimited, default: 65536")                        \
1256           range(min_intx, max_intx)                                         \
1257                                                                             \
1258   product(bool, EagerXrunInit, false,                                       \
1259           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1260           "but not all -Xrun libraries may support the state of the VM "    \
1261           "at this time")                                                   \
1262                                                                             \
1263   product(bool, PreserveAllAnnotations, false,                              \
1264           "Preserve RuntimeInvisibleAnnotations as well "                   \
1265           "as RuntimeVisibleAnnotations")                                   \
1266                                                                             \
1267   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1268           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1269                                                                             \
1270   product(bool, UseXMMForArrayCopy, false,                                  \
1271           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1272                                                                             \
1273   product(intx, FieldsAllocationStyle, 1,                                   \
1274           "0 - type based with oops first, "                                \
1275           "1 - with oops last, "                                            \
1276           "2 - oops in super and sub classes are together")                 \
1277           range(0, 2)                                                       \
1278                                                                             \
1279   product(bool, CompactFields, true,                                        \
1280           "Allocate nonstatic fields in gaps between previous fields")      \
1281                                                                             \
1282   notproduct(bool, PrintFieldLayout, false,                                 \
1283           "Print field layout for each class")                              \
1284                                                                             \
1285   /* Need to limit the extent of the padding to reasonable size.          */\
1286   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1287   /* aggressive prefetching, while still leaving the room for segregating */\
1288   /* among the distinct pages.                                            */\
1289   product(intx, ContendedPaddingWidth, 128,                                 \
1290           "How many bytes to pad the fields/classes marked @Contended with")\
1291           range(0, 8192)                                                    \
1292           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1293                                                                             \
1294   product(bool, EnableContended, true,                                      \
1295           "Enable @Contended annotation support")                           \
1296                                                                             \
1297   product(bool, RestrictContended, true,                                    \
1298           "Restrict @Contended to trusted classes")                         \
1299                                                                             \
1300   product(bool, UseBiasedLocking, true,                                     \
1301           "Enable biased locking in JVM")                                   \
1302                                                                             \
1303   product(intx, BiasedLockingStartupDelay, 4000,                            \
1304           "Number of milliseconds to wait before enabling biased locking")  \
1305           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1306           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1307                                                                             \
1308   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1309           "Print statistics of biased locking in JVM")                      \
1310                                                                             \
1311   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1312           "Threshold of number of revocations per type to try to "          \
1313           "rebias all objects in the heap of that type")                    \
1314           range(0, max_intx)                                                \
1315           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1316                                                                             \
1317   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1318           "Threshold of number of revocations per type to permanently "     \
1319           "revoke biases of all objects in the heap of that type")          \
1320           range(0, max_intx)                                                \
1321           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1322                                                                             \
1323   product(intx, BiasedLockingDecayTime, 25000,                              \
1324           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1325           "type after previous bulk rebias")                                \
1326           range(500, max_intx)                                              \
1327           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1328                                                                             \
1329   product(bool, ExitOnOutOfMemoryError, false,                              \
1330           "JVM exits on the first occurrence of an out-of-memory error")    \
1331                                                                             \
1332   product(bool, CrashOnOutOfMemoryError, false,                             \
1333           "JVM aborts, producing an error log and core/mini dump, on the "  \
1334           "first occurrence of an out-of-memory error")                     \
1335                                                                             \
1336   /* tracing */                                                             \
1337                                                                             \
1338   develop(bool, StressRewriter, false,                                      \
1339           "Stress linktime bytecode rewriting")                             \
1340                                                                             \
1341   product(ccstr, TraceJVMTI, NULL,                                          \
1342           "Trace flags for JVMTI functions and events")                     \
1343                                                                             \
1344   /* This option can change an EMCP method into an obsolete method. */      \
1345   /* This can affect tests that except specific methods to be EMCP. */      \
1346   /* This option should be used with caution.                       */      \
1347   product(bool, StressLdcRewrite, false,                                    \
1348           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1349                                                                             \
1350   /* change to false by default sometime after Mustang */                   \
1351   product(bool, VerifyMergedCPBytecodes, true,                              \
1352           "Verify bytecodes after RedefineClasses constant pool merging")   \
1353                                                                             \
1354   develop(bool, TraceBytecodes, false,                                      \
1355           "Trace bytecode execution")                                       \
1356                                                                             \
1357   develop(bool, TraceICs, false,                                            \
1358           "Trace inline cache changes")                                     \
1359                                                                             \
1360   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1361           "Trace method invocation counter overflow")                       \
1362                                                                             \
1363   develop(bool, TraceInlineCacheClearing, false,                            \
1364           "Trace clearing of inline caches in nmethods")                    \
1365                                                                             \
1366   develop(bool, TraceDependencies, false,                                   \
1367           "Trace dependencies")                                             \
1368                                                                             \
1369   develop(bool, VerifyDependencies, trueInDebug,                            \
1370           "Exercise and verify the compilation dependency mechanism")       \
1371                                                                             \
1372   develop(bool, TraceNewOopMapGeneration, false,                            \
1373           "Trace OopMapGeneration")                                         \
1374                                                                             \
1375   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1376           "Trace OopMapGeneration: print detailed cell states")             \
1377                                                                             \
1378   develop(bool, TimeOopMap, false,                                          \
1379           "Time calls to GenerateOopMap::compute_map() in sum")             \
1380                                                                             \
1381   develop(bool, TimeOopMap2, false,                                         \
1382           "Time calls to GenerateOopMap::compute_map() individually")       \
1383                                                                             \
1384   develop(bool, TraceOopMapRewrites, false,                                 \
1385           "Trace rewriting of method oops during oop map generation")       \
1386                                                                             \
1387   develop(bool, TraceICBuffer, false,                                       \
1388           "Trace usage of IC buffer")                                       \
1389                                                                             \
1390   develop(bool, TraceCompiledIC, false,                                     \
1391           "Trace changes of compiled IC")                                   \
1392                                                                             \
1393   /* gc */                                                                  \
1394                                                                             \
1395   product(bool, UseSerialGC, false,                                         \
1396           "Use the Serial garbage collector")                               \
1397                                                                             \
1398   product(bool, UseG1GC, false,                                             \
1399           "Use the Garbage-First garbage collector")                        \
1400                                                                             \
1401   product(bool, UseParallelGC, false,                                       \
1402           "Use the Parallel Scavenge garbage collector")                    \
1403                                                                             \
1404   product(bool, UseParallelOldGC, false,                                    \
1405           "Use the Parallel Old garbage collector")                         \
1406                                                                             \
1407   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1408           "How often should we maximally compact the heap (not allowing "   \
1409           "any dead space)")                                                \
1410           range(0, max_uintx)                                               \
1411                                                                             \
1412   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1413           "The collection count for the first maximum compaction")          \
1414           range(0, max_uintx)                                               \
1415                                                                             \
1416   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1417           "Use maximum compaction in the Parallel Old garbage collector "   \
1418           "for a system GC")                                                \
1419                                                                             \
1420   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1421           "The mean used by the parallel compact dead wood "                \
1422           "limiter (a number between 0-100)")                               \
1423           range(0, 100)                                                     \
1424                                                                             \
1425   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1426           "The standard deviation used by the parallel compact dead wood "  \
1427           "limiter (a number between 0-100)")                               \
1428           range(0, 100)                                                     \
1429                                                                             \
1430   product(uint, ParallelGCThreads, 0,                                       \
1431           "Number of parallel threads parallel gc will use")                \
1432           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1433                                                                             \
1434   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1435             "Use semaphore synchronization for the GC Threads, "            \
1436             "instead of synchronization based on mutexes")                  \
1437                                                                             \
1438   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1439           "Dynamically choose the number of parallel threads "              \
1440           "parallel gc will use")                                           \
1441                                                                             \
1442   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1443              "Inject thread creation failures for "                         \
1444              "UseDynamicNumberOfGCThreads")                                 \
1445                                                                             \
1446   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1447           "Force dynamic selection of the number of "                       \
1448           "parallel threads parallel gc will use to aid debugging")         \
1449                                                                             \
1450   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1451           "Size of heap (bytes) per GC thread used in calculating the "     \
1452           "number of GC threads")                                           \
1453           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1454                                                                             \
1455   product(uint, ConcGCThreads, 0,                                           \
1456           "Number of threads concurrent gc will use")                       \
1457           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1458                                                                             \
1459   product(uint, GCTaskTimeStampEntries, 200,                                \
1460           "Number of time stamp entries per gc worker thread")              \
1461           range(1, max_jint)                                                \
1462                                                                             \
1463   product(bool, AlwaysTenure, false,                                        \
1464           "Always tenure objects in eden (ParallelGC only)")                \
1465                                                                             \
1466   product(bool, NeverTenure, false,                                         \
1467           "Never tenure objects in eden, may tenure on overflow "           \
1468           "(ParallelGC only)")                                              \
1469                                                                             \
1470   product(bool, ScavengeBeforeFullGC, true,                                 \
1471           "Scavenge youngest generation before each full GC.")              \
1472                                                                             \
1473   product(bool, UseConcMarkSweepGC, false,                                  \
1474           "Use Concurrent Mark-Sweep GC in the old generation")             \
1475                                                                             \
1476   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1477           "A System.gc() request invokes a concurrent collection; "         \
1478           "(effective only when using concurrent collectors)")              \
1479                                                                             \
1480   product(bool, GCLockerInvokesConcurrent, false,                           \
1481           "The exit of a JNI critical section necessitating a scavenge, "   \
1482           "also kicks off a background concurrent collection")              \
1483                                                                             \
1484   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1485           "How much the GC can expand the eden by while the GC locker "     \
1486           "is active (as a percentage)")                                    \
1487           range(0, 100)                                                     \
1488                                                                             \
1489   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1490           "Number of times to retry allocations when "                      \
1491           "blocked by the GC locker")                                       \
1492           range(0, max_uintx)                                               \
1493                                                                             \
1494   product(bool, UseCMSBestFit, true,                                        \
1495           "Use CMS best fit allocation strategy")                           \
1496                                                                             \
1497   product(uintx, ParallelGCBufferWastePct, 10,                              \
1498           "Wasted fraction of parallel allocation buffer")                  \
1499           range(0, 100)                                                     \
1500                                                                             \
1501   product(uintx, TargetPLABWastePct, 10,                                    \
1502           "Target wasted space in last buffer as percent of overall "       \
1503           "allocation")                                                     \
1504           range(1, 100)                                                     \
1505                                                                             \
1506   product(uintx, PLABWeight, 75,                                            \
1507           "Percentage (0-100) used to weight the current sample when "      \
1508           "computing exponentially decaying average for ResizePLAB")        \
1509           range(0, 100)                                                     \
1510                                                                             \
1511   product(bool, ResizePLAB, true,                                           \
1512           "Dynamically resize (survivor space) promotion LAB's")            \
1513                                                                             \
1514   product(int, ParGCArrayScanChunk, 50,                                     \
1515           "Scan a subset of object array and push remainder, if array is "  \
1516           "bigger than this")                                               \
1517           range(1, max_jint/3)                                              \
1518                                                                             \
1519   product(bool, ParGCUseLocalOverflow, false,                               \
1520           "Instead of a global overflow list, use local overflow stacks")   \
1521                                                                             \
1522   product(bool, ParGCTrimOverflow, true,                                    \
1523           "Eagerly trim the local overflow lists "                          \
1524           "(when ParGCUseLocalOverflow)")                                   \
1525                                                                             \
1526   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1527           "Simulate work queue overflow in ParNew")                         \
1528                                                                             \
1529   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1530           "An `interval' counter that determines how frequently "           \
1531           "we simulate overflow; a smaller number increases frequency")     \
1532                                                                             \
1533   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1534           "The desired number of objects to claim from the overflow list")  \
1535           range(0, max_uintx)                                               \
1536                                                                             \
1537   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1538           "The number of strides per worker thread that we divide up the "  \
1539           "card table scanning work into")                                  \
1540           range(1, max_uintx)                                               \
1541           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1542                                                                             \
1543   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1544           "The number of cards in each chunk of the parallel chunks used "  \
1545           "during card table scanning")                                     \
1546           range(1, max_intx)                                                \
1547           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1548                                                                             \
1549   product(uintx, OldPLABWeight, 50,                                         \
1550           "Percentage (0-100) used to weight the current sample when "      \
1551           "computing exponentially decaying average for resizing "          \
1552           "OldPLABSize")                                                    \
1553           range(0, 100)                                                     \
1554                                                                             \
1555   product(bool, ResizeOldPLAB, true,                                        \
1556           "Dynamically resize (old gen) promotion LAB's")                   \
1557                                                                             \
1558   product(size_t, CMSOldPLABMax, 1024,                                      \
1559           "Maximum size of CMS gen promotion LAB caches per worker "        \
1560           "per block size")                                                 \
1561           range(1, max_uintx)                                               \
1562           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1563                                                                             \
1564   product(size_t, CMSOldPLABMin, 16,                                        \
1565           "Minimum size of CMS gen promotion LAB caches per worker "        \
1566           "per block size")                                                 \
1567           range(1, max_uintx)                                               \
1568           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1569                                                                             \
1570   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1571           "Nominal number of refills of CMS gen promotion LAB cache "       \
1572           "per worker per block size")                                      \
1573           range(1, max_uintx)                                               \
1574                                                                             \
1575   product(bool, CMSOldPLABResizeQuicker, false,                             \
1576           "React on-the-fly during a scavenge to a sudden "                 \
1577           "change in block demand rate")                                    \
1578                                                                             \
1579   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1580           "The tolerance of the phase-change detector for on-the-fly "      \
1581           "PLAB resizing during a scavenge")                                \
1582           range(1, max_uintx)                                               \
1583                                                                             \
1584   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1585           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1586           "during a scavenge")                                              \
1587           range(1, max_uintx)                                               \
1588                                                                             \
1589   product(bool, AlwaysPreTouch, false,                                      \
1590           "Force all freshly committed pages to be pre-touched")            \
1591                                                                             \
1592   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1593           "Per-thread chunk size for parallel memory pre-touch.")           \
1594           range(1, SIZE_MAX / 2)                                            \
1595                                                                             \
1596   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1597           "The maximum size of young gen chosen by default per GC worker "  \
1598           "thread available")                                               \
1599           range(1, max_uintx)                                               \
1600                                                                             \
1601   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1602           "Percentage (0-100) used to add conservatism when computing the " \
1603           "duty cycle")                                                     \
1604           range(0, 100)                                                     \
1605                                                                             \
1606   product(uintx, CMSExpAvgFactor, 50,                                       \
1607           "Percentage (0-100) used to weight the current sample when "      \
1608           "computing exponential averages for CMS statistics")              \
1609           range(0, 100)                                                     \
1610                                                                             \
1611   product(uintx, CMS_FLSWeight, 75,                                         \
1612           "Percentage (0-100) used to weight the current sample when "      \
1613           "computing exponentially decaying averages for CMS FLS "          \
1614           "statistics")                                                     \
1615           range(0, 100)                                                     \
1616                                                                             \
1617   product(uintx, CMS_FLSPadding, 1,                                         \
1618           "The multiple of deviation from mean to use for buffering "       \
1619           "against volatility in free list demand")                         \
1620           range(0, max_juint)                                               \
1621                                                                             \
1622   product(uintx, FLSCoalescePolicy, 2,                                      \
1623           "CMS: aggressiveness level for coalescing, increasing "           \
1624           "from 0 to 4")                                                    \
1625           range(0, 4)                                                       \
1626                                                                             \
1627   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1628           "CMS: larger free blocks are always available for coalescing")    \
1629                                                                             \
1630   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1631           "CMS: the smaller the percentage the greater the coalescing "     \
1632           "force")                                                          \
1633           range(0.0, 1.0)                                                   \
1634                                                                             \
1635   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1636           "CMS: the factor by which to inflate estimated demand of small "  \
1637           "block sizes to prevent coalescing with an adjoining block")      \
1638           range(0.0, DBL_MAX)                                               \
1639                                                                             \
1640   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1641           "CMS: the factor by which to inflate estimated demand of large "  \
1642           "block sizes to prevent coalescing with an adjoining block")      \
1643           range(0.0, DBL_MAX)                                               \
1644                                                                             \
1645   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1646           "CMS: the factor by which to inflate estimated demand of small "  \
1647           "block sizes to prevent splitting to supply demand for smaller "  \
1648           "blocks")                                                         \
1649           range(0.0, DBL_MAX)                                               \
1650                                                                             \
1651   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1652           "CMS: the factor by which to inflate estimated demand of large "  \
1653           "block sizes to prevent splitting to supply demand for smaller "  \
1654           "blocks")                                                         \
1655           range(0.0, DBL_MAX)                                               \
1656                                                                             \
1657   product(bool, CMSExtrapolateSweep, false,                                 \
1658           "CMS: cushion for block demand during sweep")                     \
1659                                                                             \
1660   product(uintx, CMS_SweepWeight, 75,                                       \
1661           "Percentage (0-100) used to weight the current sample when "      \
1662           "computing exponentially decaying average for inter-sweep "       \
1663           "duration")                                                       \
1664           range(0, 100)                                                     \
1665                                                                             \
1666   product(uintx, CMS_SweepPadding, 1,                                       \
1667           "The multiple of deviation from mean to use for buffering "       \
1668           "against volatility in inter-sweep duration")                     \
1669           range(0, max_juint)                                               \
1670                                                                             \
1671   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1672           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1673           "duration exceeds this threshold in milliseconds")                \
1674           range(0, max_uintx)                                               \
1675                                                                             \
1676   product(bool, CMSClassUnloadingEnabled, true,                             \
1677           "Whether class unloading enabled when using CMS GC")              \
1678                                                                             \
1679   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1680           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1681           "count for which classes may not be unloaded")                    \
1682           range(0, max_uintx)                                               \
1683                                                                             \
1684   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1685           "Replenish an indexed free list with this number of chunks")      \
1686           range(1, max_uintx)                                               \
1687                                                                             \
1688   product(bool, CMSReplenishIntermediate, true,                             \
1689           "Replenish all intermediate free-list caches")                    \
1690                                                                             \
1691   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1692           "When satisfying batched demand, split blocks from the "          \
1693           "IndexedFreeList whose size is a multiple of requested size")     \
1694                                                                             \
1695   product(bool, CMSLoopWarn, false,                                         \
1696           "Warn in case of excessive CMS looping")                          \
1697                                                                             \
1698   /* where does the range max value of (max_jint - 1) come from? */         \
1699   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1700           "Maximum size of marking stack")                                  \
1701           range(1, (max_jint - 1))                                          \
1702                                                                             \
1703   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1704           "Size of marking stack")                                          \
1705           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1706                                                                             \
1707   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1708           "Simulate frequent marking stack / work queue overflow")          \
1709                                                                             \
1710   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1711           "An \"interval\" counter that determines how frequently "         \
1712           "to simulate overflow; a smaller number increases frequency")     \
1713                                                                             \
1714   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1715           "Maximum number of abortable preclean iterations, if > 0")        \
1716           range(0, max_uintx)                                               \
1717                                                                             \
1718   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1719           "Maximum time in abortable preclean (in milliseconds)")           \
1720           range(0, max_intx)                                                \
1721                                                                             \
1722   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1723           "Nominal minimum work per abortable preclean iteration")          \
1724           range(0, max_uintx)                                               \
1725                                                                             \
1726   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1727           "Time that we sleep between iterations when not given "           \
1728           "enough work per iteration")                                      \
1729           range(0, max_intx)                                                \
1730                                                                             \
1731   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1732   product(size_t, CMSRescanMultiple, 32,                                    \
1733           "Size (in cards) of CMS parallel rescan task")                    \
1734           range(1, SIZE_MAX / 4096)                                         \
1735           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1736                                                                             \
1737   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1738   product(size_t, CMSConcMarkMultiple, 32,                                  \
1739           "Size (in cards) of CMS concurrent MT marking task")              \
1740           range(1, SIZE_MAX / 4096)                                         \
1741           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1742                                                                             \
1743   product(bool, CMSAbortSemantics, false,                                   \
1744           "Whether abort-on-overflow semantics is implemented")             \
1745                                                                             \
1746   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1747           "Use the parallel initial mark.")                                 \
1748                                                                             \
1749   product(bool, CMSParallelRemarkEnabled, true,                             \
1750           "Whether parallel remark enabled (only if ParNewGC)")             \
1751                                                                             \
1752   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1753           "Whether parallel remark of survivor space "                      \
1754           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1755                                                                             \
1756   product(bool, CMSPLABRecordAlways, true,                                  \
1757           "Always record survivor space PLAB boundaries (effective only "   \
1758           "if CMSParallelSurvivorRemarkEnabled)")                           \
1759                                                                             \
1760   product(bool, CMSEdenChunksRecordAlways, true,                            \
1761           "Always record eden chunks used for the parallel initial mark "   \
1762           "or remark of eden")                                              \
1763                                                                             \
1764   product(bool, CMSConcurrentMTEnabled, true,                               \
1765           "Whether multi-threaded concurrent work enabled "                 \
1766           "(effective only if ParNewGC)")                                   \
1767                                                                             \
1768   product(bool, CMSPrecleaningEnabled, true,                                \
1769           "Whether concurrent precleaning enabled")                         \
1770                                                                             \
1771   product(uintx, CMSPrecleanIter, 3,                                        \
1772           "Maximum number of precleaning iteration passes")                 \
1773           range(0, 9)                                                       \
1774                                                                             \
1775   product(uintx, CMSPrecleanDenominator, 3,                                 \
1776           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1777           "ratio")                                                          \
1778           range(1, max_uintx)                                               \
1779           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1780                                                                             \
1781   product(uintx, CMSPrecleanNumerator, 2,                                   \
1782           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1783           "ratio")                                                          \
1784           range(0, max_uintx-1)                                             \
1785           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1786                                                                             \
1787   product(bool, CMSPrecleanRefLists1, true,                                 \
1788           "Preclean ref lists during (initial) preclean phase")             \
1789                                                                             \
1790   product(bool, CMSPrecleanRefLists2, false,                                \
1791           "Preclean ref lists during abortable preclean phase")             \
1792                                                                             \
1793   product(bool, CMSPrecleanSurvivors1, false,                               \
1794           "Preclean survivors during (initial) preclean phase")             \
1795                                                                             \
1796   product(bool, CMSPrecleanSurvivors2, true,                                \
1797           "Preclean survivors during abortable preclean phase")             \
1798                                                                             \
1799   product(uintx, CMSPrecleanThreshold, 1000,                                \
1800           "Do not iterate again if number of dirty cards is less than this")\
1801           range(100, max_uintx)                                             \
1802                                                                             \
1803   product(bool, CMSCleanOnEnter, true,                                      \
1804           "Clean-on-enter optimization for reducing number of dirty cards") \
1805                                                                             \
1806   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1807           "Choose variant (1,2) of verification following remark")          \
1808           range(1, 2)                                                       \
1809                                                                             \
1810   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1811           "If Eden size is below this, do not try to schedule remark")      \
1812           range(0, max_uintx)                                               \
1813                                                                             \
1814   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1815           "The Eden occupancy percentage (0-100) at which "                 \
1816           "to try and schedule remark pause")                               \
1817           range(0, 100)                                                     \
1818                                                                             \
1819   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1820           "Start sampling eden top at least before young gen "              \
1821           "occupancy reaches 1/<ratio> of the size at which "               \
1822           "we plan to schedule remark")                                     \
1823           range(1, max_uintx)                                               \
1824                                                                             \
1825   product(uintx, CMSSamplingGrain, 16*K,                                    \
1826           "The minimum distance between eden samples for CMS (see above)")  \
1827           range(ObjectAlignmentInBytes, max_uintx)                          \
1828           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1829                                                                             \
1830   product(bool, CMSScavengeBeforeRemark, false,                             \
1831           "Attempt scavenge before the CMS remark step")                    \
1832                                                                             \
1833   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1834           "Don't drain below this size per parallel worker/thief")          \
1835           range(1, max_juint)                                               \
1836           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1837                                                                             \
1838   manageable(intx, CMSWaitDuration, 2000,                                   \
1839           "Time in milliseconds that CMS thread waits for young GC")        \
1840           range(min_jint, max_jint)                                         \
1841                                                                             \
1842   develop(uintx, CMSCheckInterval, 1000,                                    \
1843           "Interval in milliseconds that CMS thread checks if it "          \
1844           "should start a collection cycle")                                \
1845                                                                             \
1846   product(bool, CMSYield, true,                                             \
1847           "Yield between steps of CMS")                                     \
1848                                                                             \
1849   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1850           "Bitmap operations should process at most this many bits "        \
1851           "between yields")                                                 \
1852           range(1, max_uintx)                                               \
1853           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1854                                                                             \
1855   product(bool, CMSPrintChunksInDump, false,                                \
1856           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1857           "trace level include more detailed information about the"         \
1858           "free chunks")                \
1859                                                                             \
1860   product(bool, CMSPrintObjectsInDump, false,                               \
1861           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1862           "trace level include more detailed information about the"         \
1863           "allocated objects")                                              \
1864                                                                             \
1865   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1866           "Verify that all references across the FLS boundary "             \
1867           "are to valid objects")                                           \
1868                                                                             \
1869   diagnostic(bool, FLSVerifyLists, false,                                   \
1870           "Do lots of (expensive) FreeListSpace verification")              \
1871                                                                             \
1872   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1873           "Do lots of (expensive) FLS index table verification")            \
1874                                                                             \
1875   develop(bool, FLSVerifyDictionary, false,                                 \
1876           "Do lots of (expensive) FLS dictionary verification")             \
1877                                                                             \
1878   develop(bool, VerifyBlockOffsetArray, false,                              \
1879           "Do (expensive) block offset array verification")                 \
1880                                                                             \
1881   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1882           "Maintain _unallocated_block in BlockOffsetArray "                \
1883           "(currently applicable only to CMS collector)")                   \
1884                                                                             \
1885   product(intx, RefDiscoveryPolicy, 0,                                      \
1886           "Select type of reference discovery policy: "                     \
1887           "reference-based(0) or referent-based(1)")                        \
1888           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1889                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1890                                                                             \
1891   product(bool, ParallelRefProcEnabled, false,                              \
1892           "Enable parallel reference processing whenever possible")         \
1893                                                                             \
1894   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1895           "Enable balancing of reference processing queues")                \
1896                                                                             \
1897   product(uintx, CMSTriggerRatio, 80,                                       \
1898           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1899           "allocated before a CMS collection cycle commences")              \
1900           range(0, 100)                                                     \
1901                                                                             \
1902   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1903           "Percentage CMS generation occupancy at which to "                \
1904           "initiate CMS collection for bootstrapping collection stats")     \
1905           range(0, 100)                                                     \
1906                                                                             \
1907   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1908           "Percentage CMS generation occupancy to start a CMS collection "  \
1909           "cycle. A negative value means that CMSTriggerRatio is used")     \
1910           range(min_intx, 100)                                              \
1911                                                                             \
1912   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1913           "The percent occupancy (IHOP) of the current old generation "     \
1914           "capacity above which a concurrent mark cycle will be initiated " \
1915           "Its value may change over time if adaptive IHOP is enabled, "    \
1916           "otherwise the value remains constant. "                          \
1917           "In the latter case a value of 0 will result as frequent as "     \
1918           "possible concurrent marking cycles. A value of 100 disables "    \
1919           "concurrent marking. "                                            \
1920           "Fragmentation waste in the old generation is not considered "    \
1921           "free space in this calculation. (G1 collector only)")            \
1922           range(0, 100)                                                     \
1923                                                                             \
1924   manageable(intx, CMSTriggerInterval, -1,                                  \
1925           "Commence a CMS collection cycle (at least) every so many "       \
1926           "milliseconds (0 permanently, -1 disabled)")                      \
1927           range(-1, max_intx)                                               \
1928                                                                             \
1929   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1930           "Only use occupancy as a criterion for starting a CMS collection")\
1931                                                                             \
1932   product(uintx, CMSIsTooFullPercentage, 98,                                \
1933           "An absolute ceiling above which CMS will always consider the "   \
1934           "unloading of classes when class unloading is enabled")           \
1935           range(0, 100)                                                     \
1936                                                                             \
1937   develop(bool, CMSTestInFreeList, false,                                   \
1938           "Check if the coalesced range is already in the "                 \
1939           "free lists as claimed")                                          \
1940                                                                             \
1941   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1942           "Check that all the garbage collected was returned to the "       \
1943           "free lists")                                                     \
1944                                                                             \
1945   notproduct(bool, ScavengeALot, false,                                     \
1946           "Force scavenge at every Nth exit from the runtime system "       \
1947           "(N=ScavengeALotInterval)")                                       \
1948                                                                             \
1949   develop(bool, FullGCALot, false,                                          \
1950           "Force full gc at every Nth exit from the runtime system "        \
1951           "(N=FullGCALotInterval)")                                         \
1952                                                                             \
1953   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1954           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1955                                                                             \
1956   notproduct(bool, PromotionFailureALot, false,                             \
1957           "Use promotion failure handling on every youngest generation "    \
1958           "collection")                                                     \
1959                                                                             \
1960   develop(uintx, PromotionFailureALotCount, 1000,                           \
1961           "Number of promotion failures occurring at PLAB "                 \
1962           "refill attempts (ParNew) or promotion attempts "                 \
1963           "(other young collectors)")                                       \
1964                                                                             \
1965   develop(uintx, PromotionFailureALotInterval, 5,                           \
1966           "Total collections between promotion failures a lot")             \
1967                                                                             \
1968   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1969           "Sleep time when sleep is used for yields")                       \
1970                                                                             \
1971   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1972           "Number of yields before a sleep is done during work stealing")   \
1973                                                                             \
1974   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1975           "Number of iterations in a spin loop between checks on "          \
1976           "time out of hard spin")                                          \
1977                                                                             \
1978   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1979           "Ratio of hard spins to calls to yield")                          \
1980                                                                             \
1981   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1982           "Number of object array elements to push onto the marking stack " \
1983           "before pushing a continuation entry")                            \
1984                                                                             \
1985   develop(bool, MetadataAllocationFailALot, false,                          \
1986           "Fail metadata allocations at intervals controlled by "           \
1987           "MetadataAllocationFailALotInterval")                             \
1988                                                                             \
1989   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1990           "Metadata allocation failure a lot interval")                     \
1991                                                                             \
1992   notproduct(bool, ExecuteInternalVMTests, false,                           \
1993           "Enable execution of internal VM tests")                          \
1994                                                                             \
1995   notproduct(bool, VerboseInternalVMTests, false,                           \
1996           "Turn on logging for internal VM tests.")                         \
1997                                                                             \
1998   product(bool, ExecutingUnitTests, false,                                  \
1999           "Whether the JVM is running unit tests or not")                   \
2000                                                                             \
2001   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2002                                                                             \
2003   product_pd(bool, ResizeTLAB,                                              \
2004           "Dynamically resize TLAB size for threads")                       \
2005                                                                             \
2006   product(bool, ZeroTLAB, false,                                            \
2007           "Zero out the newly created TLAB")                                \
2008                                                                             \
2009   product(bool, FastTLABRefill, true,                                       \
2010           "Use fast TLAB refill code")                                      \
2011                                                                             \
2012   product(bool, TLABStats, true,                                            \
2013           "Provide more detailed and expensive TLAB statistics.")           \
2014                                                                             \
2015   product_pd(bool, NeverActAsServerClassMachine,                            \
2016           "Never act like a server-class machine")                          \
2017                                                                             \
2018   product(bool, AlwaysActAsServerClassMachine, false,                       \
2019           "Always act like a server-class machine")                         \
2020                                                                             \
2021   product_pd(uint64_t, MaxRAM,                                              \
2022           "Real memory size (in bytes) used to set maximum heap size")      \
2023           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2024                                                                             \
2025   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2026           "Maximum ergonomically set heap size (in bytes); zero means use " \
2027           "MaxRAM / MaxRAMFraction")                                        \
2028           range(0, max_uintx)                                               \
2029                                                                             \
2030   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2031           "Use CGroup memory limit as physical memory limit for heap "      \
2032           "sizing")                                                         \
2033                                                                             \
2034   product(uintx, MaxRAMFraction, 4,                                         \
2035           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2036           "size")                                                           \
2037           range(1, max_uintx)                                               \
2038                                                                             \
2039   product(uintx, MinRAMFraction, 2,                                         \
2040           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2041           "size on systems with small physical memory size")                \
2042           range(1, max_uintx)                                               \
2043                                                                             \
2044   product(uintx, InitialRAMFraction, 64,                                    \
2045           "Fraction (1/n) of real memory used for initial heap size")       \
2046           range(1, max_uintx)                                               \
2047                                                                             \
2048   develop(uintx, MaxVirtMemFraction, 2,                                     \
2049           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2050           "determining maximum heap size")                                  \
2051                                                                             \
2052   product(bool, UseAdaptiveSizePolicy, true,                                \
2053           "Use adaptive generation sizing policies")                        \
2054                                                                             \
2055   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2056           "Use adaptive survivor sizing policies")                          \
2057                                                                             \
2058   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2059           "Use adaptive young-old sizing policies at minor collections")    \
2060                                                                             \
2061   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2062           "Use adaptive young-old sizing policies at major collections")    \
2063                                                                             \
2064   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2065           "Include statistics from System.gc() for adaptive size policy")   \
2066                                                                             \
2067   product(bool, UseAdaptiveGCBoundary, false,                               \
2068           "Allow young-old boundary to move")                               \
2069                                                                             \
2070   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2071           "Resize the virtual spaces of the young or old generations")      \
2072           range(-1, 1)                                                      \
2073                                                                             \
2074   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2075           "Policy for changing generation size for throughput goals")       \
2076           range(0, 1)                                                       \
2077                                                                             \
2078   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2079           "Number of steps where heuristics is used before data is used")   \
2080           range(0, max_uintx)                                               \
2081                                                                             \
2082   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2083           "Number of collections before the adaptive sizing is started")    \
2084                                                                             \
2085   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2086           "Collection interval for printing information; zero means never") \
2087           range(0, max_uintx)                                               \
2088                                                                             \
2089   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2090           "Use adaptive minimum footprint as a goal")                       \
2091                                                                             \
2092   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2093           "Weight given to exponential resizing, between 0 and 100")        \
2094           range(0, 100)                                                     \
2095                                                                             \
2096   product(uintx, AdaptiveTimeWeight,       25,                              \
2097           "Weight given to time in adaptive policy, between 0 and 100")     \
2098           range(0, 100)                                                     \
2099                                                                             \
2100   product(uintx, PausePadding, 1,                                           \
2101           "How much buffer to keep for pause time")                         \
2102           range(0, max_juint)                                               \
2103                                                                             \
2104   product(uintx, PromotedPadding, 3,                                        \
2105           "How much buffer to keep for promotion failure")                  \
2106           range(0, max_juint)                                               \
2107                                                                             \
2108   product(uintx, SurvivorPadding, 3,                                        \
2109           "How much buffer to keep for survivor overflow")                  \
2110           range(0, max_juint)                                               \
2111                                                                             \
2112   product(uintx, ThresholdTolerance, 10,                                    \
2113           "Allowed collection cost difference between generations")         \
2114           range(0, 100)                                                     \
2115                                                                             \
2116   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2117           "If collection costs are within margin, reduce both by full "     \
2118           "delta")                                                          \
2119           range(0, 100)                                                     \
2120                                                                             \
2121   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2122           "Adaptive size percentage change in young generation")            \
2123           range(0, 100)                                                     \
2124                                                                             \
2125   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2126           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2127           range(0, 100)                                                     \
2128                                                                             \
2129   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2130           "Decay factor to YoungedGenerationSizeSupplement")                \
2131           range(1, max_uintx)                                               \
2132                                                                             \
2133   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2134           "Adaptive size percentage change in tenured generation")          \
2135           range(0, 100)                                                     \
2136                                                                             \
2137   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2138           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2139           range(0, 100)                                                     \
2140                                                                             \
2141   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2142           "Decay factor to TenuredGenerationSizeIncrement")                 \
2143           range(1, max_uintx)                                               \
2144                                                                             \
2145   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2146           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2147           "or (G1 Only) the maximum GC time per MMU time slice")            \
2148           range(1, max_uintx - 1)                                           \
2149           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2150                                                                             \
2151   product(uintx, GCPauseIntervalMillis, 0,                                  \
2152           "Time slice for MMU specification")                               \
2153           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2154                                                                             \
2155   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2156           "Adaptive size policy maximum GC minor pause time goal "          \
2157           "in millisecond")                                                 \
2158           range(0, max_uintx)                                               \
2159                                                                             \
2160   product(uintx, GCTimeRatio, 99,                                           \
2161           "Adaptive size policy application time to GC time ratio")         \
2162           range(0, max_juint)                                               \
2163                                                                             \
2164   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2165           "Adaptive size scale down factor for shrinking")                  \
2166           range(1, max_uintx)                                               \
2167                                                                             \
2168   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2169           "Adaptive size decays the major cost for long major intervals")   \
2170                                                                             \
2171   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2172           "Time scale over which major costs decay")                        \
2173           range(0, max_uintx)                                               \
2174                                                                             \
2175   product(uintx, MinSurvivorRatio, 3,                                       \
2176           "Minimum ratio of young generation/survivor space size")          \
2177           range(3, max_uintx)                                               \
2178                                                                             \
2179   product(uintx, InitialSurvivorRatio, 8,                                   \
2180           "Initial ratio of young generation/survivor space size")          \
2181           range(0, max_uintx)                                               \
2182                                                                             \
2183   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2184           "Estimate of footprint other than Java Heap")                     \
2185           range(0, max_uintx)                                               \
2186                                                                             \
2187   product(bool, UseGCOverheadLimit, true,                                   \
2188           "Use policy to limit of proportion of time spent in GC "          \
2189           "before an OutOfMemory error is thrown")                          \
2190                                                                             \
2191   product(uintx, GCTimeLimit, 98,                                           \
2192           "Limit of the proportion of time spent in GC before "             \
2193           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2194           range(0, 100)                                                     \
2195                                                                             \
2196   product(uintx, GCHeapFreeLimit, 2,                                        \
2197           "Minimum percentage of free space after a full GC before an "     \
2198           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2199           range(0, 100)                                                     \
2200                                                                             \
2201   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2202           "Number of consecutive collections before gc time limit fires")   \
2203           range(1, max_uintx)                                               \
2204                                                                             \
2205   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2206           "How far ahead to prefetch destination area (<= 0 means off)")    \
2207           range(-1, max_jint)                                               \
2208                                                                             \
2209   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2210           "How far ahead to prefetch scan area (<= 0 means off)")           \
2211           range(-1, max_jint)                                               \
2212                                                                             \
2213   product(intx, PrefetchFieldsAhead, -1,                                    \
2214           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2215           range(-1, max_jint)                                               \
2216                                                                             \
2217   diagnostic(bool, VerifyDuringStartup, false,                              \
2218           "Verify memory system before executing any Java code "            \
2219           "during VM initialization")                                       \
2220                                                                             \
2221   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2222           "Verify system before exiting")                                   \
2223                                                                             \
2224   diagnostic(bool, VerifyBeforeGC, false,                                   \
2225           "Verify memory system before GC")                                 \
2226                                                                             \
2227   diagnostic(bool, VerifyAfterGC, false,                                    \
2228           "Verify memory system after GC")                                  \
2229                                                                             \
2230   diagnostic(bool, VerifyDuringGC, false,                                   \
2231           "Verify memory system during GC (between phases)")                \
2232                                                                             \
2233   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2234           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2235           "are enabled. One or more sub-systems can be specified "          \
2236           "in a comma separated string. Sub-systems are: "                  \
2237           "threads, heap, symbol_table, string_table, codecache, "          \
2238           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2239           "codecache_oops")                                                 \
2240                                                                             \
2241   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2242           "Enable parallel memory system verification")                     \
2243                                                                             \
2244   diagnostic(bool, DeferInitialCardMark, false,                             \
2245           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2246           "may arise from new_pre_store_barrier")                           \
2247                                                                             \
2248   product(bool, UseCondCardMark, false,                                     \
2249           "Check for already marked card before updating card table")       \
2250                                                                             \
2251   diagnostic(bool, VerifyRememberedSets, false,                             \
2252           "Verify GC remembered sets")                                      \
2253                                                                             \
2254   diagnostic(bool, VerifyObjectStartArray, true,                            \
2255           "Verify GC object start array if verify before/after")            \
2256                                                                             \
2257   product(bool, DisableExplicitGC, false,                                   \
2258           "Ignore calls to System.gc()")                                    \
2259                                                                             \
2260   notproduct(bool, CheckMemoryInitialization, false,                        \
2261           "Check memory initialization")                                    \
2262                                                                             \
2263   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2264           "Bind CMS Thread to CPU if possible")                             \
2265                                                                             \
2266   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2267           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2268           range(0, max_juint)                                               \
2269                                                                             \
2270   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2271           "Bind GCTaskThreads to CPUs if possible")                         \
2272                                                                             \
2273   product(bool, UseGCTaskAffinity, false,                                   \
2274           "Use worker affinity when asking for GCTasks")                    \
2275                                                                             \
2276   product(uintx, ProcessDistributionStride, 4,                              \
2277           "Stride through processors when distributing processes")          \
2278           range(0, max_juint)                                               \
2279                                                                             \
2280   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2281           "Number of times the coordinator GC thread will sleep while "     \
2282           "yielding before giving up and resuming GC")                      \
2283           range(0, max_juint)                                               \
2284                                                                             \
2285   product(uintx, CMSYieldSleepCount, 0,                                     \
2286           "Number of times a GC thread (minus the coordinator) "            \
2287           "will sleep while yielding before giving up and resuming GC")     \
2288           range(0, max_juint)                                               \
2289                                                                             \
2290   product(bool, PrintGC, false,                                             \
2291           "Print message at garbage collection. "                           \
2292           "Deprecated, use -Xlog:gc instead.")                              \
2293                                                                             \
2294   product(bool, PrintGCDetails, false,                                      \
2295           "Print more details at garbage collection. "                      \
2296           "Deprecated, use -Xlog:gc* instead.")                             \
2297                                                                             \
2298   develop(intx, ConcGCYieldTimeout, 0,                                      \
2299           "If non-zero, assert that GC threads yield within this "          \
2300           "number of milliseconds")                                         \
2301           range(0, max_intx)                                                \
2302                                                                             \
2303   develop(bool, TraceFinalizerRegistration, false,                          \
2304           "Trace registration of final references")                         \
2305                                                                             \
2306   notproduct(bool, TraceScavenge, false,                                    \
2307           "Trace scavenge")                                                 \
2308                                                                             \
2309   product(bool, IgnoreEmptyClassPaths, false,                               \
2310           "Ignore empty path elements in -classpath")                       \
2311                                                                             \
2312   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2313           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2314           "Initial size of the boot class loader data metaspace")           \
2315           range(30*K, max_uintx/BytesPerWord)                               \
2316           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2317                                                                             \
2318   product(bool, TraceYoungGenTime, false,                                   \
2319           "Trace accumulated time for young collection")                    \
2320                                                                             \
2321   product(bool, TraceOldGenTime, false,                                     \
2322           "Trace accumulated time for old collection")                      \
2323                                                                             \
2324   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2325           "Print heap layout in response to SIGBREAK")                      \
2326                                                                             \
2327   manageable(bool, PrintClassHistogram, false,                              \
2328           "Print a histogram of class instances")                           \
2329                                                                             \
2330   develop(bool, TraceGCTaskManager, false,                                  \
2331           "Trace actions of the GC task manager")                           \
2332                                                                             \
2333   develop(bool, TraceGCTaskQueue, false,                                    \
2334           "Trace actions of the GC task queues")                            \
2335                                                                             \
2336   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2337           "Trace marking phase in ParallelOldGC")                           \
2338                                                                             \
2339   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2340           "Trace dense prefix computation for ParallelOldGC")               \
2341                                                                             \
2342   develop(bool, IgnoreLibthreadGPFault, false,                              \
2343           "Suppress workaround for libthread GP fault")                     \
2344                                                                             \
2345   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2346           "The percentage of the used heap that the instances of a class "  \
2347           "must occupy for the class to generate a trace event")            \
2348           range(0.0, 100.0)                                                 \
2349                                                                             \
2350   /* JVMTI heap profiling */                                                \
2351                                                                             \
2352   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2353           "Trace JVMTI object tagging calls")                               \
2354                                                                             \
2355   diagnostic(bool, VerifyBeforeIteration, false,                            \
2356           "Verify memory system before JVMTI iteration")                    \
2357                                                                             \
2358   /* compiler interface */                                                  \
2359                                                                             \
2360   develop(bool, CIPrintCompilerName, false,                                 \
2361           "when CIPrint is active, print the name of the active compiler")  \
2362                                                                             \
2363   diagnostic(bool, CIPrintCompileQueue, false,                              \
2364           "display the contents of the compile queue whenever a "           \
2365           "compilation is enqueued")                                        \
2366                                                                             \
2367   develop(bool, CIPrintRequests, false,                                     \
2368           "display every request for compilation")                          \
2369                                                                             \
2370   product(bool, CITime, false,                                              \
2371           "collect timing information for compilation")                     \
2372                                                                             \
2373   develop(bool, CITimeVerbose, false,                                       \
2374           "be more verbose in compilation timings")                         \
2375                                                                             \
2376   develop(bool, CITimeEach, false,                                          \
2377           "display timing information after each successful compilation")   \
2378                                                                             \
2379   develop(bool, CICountOSR, false,                                          \
2380           "use a separate counter when assigning ids to osr compilations")  \
2381                                                                             \
2382   develop(bool, CICompileNatives, true,                                     \
2383           "compile native methods if supported by the compiler")            \
2384                                                                             \
2385   develop_pd(bool, CICompileOSR,                                            \
2386           "compile on stack replacement methods if supported by the "       \
2387           "compiler")                                                       \
2388                                                                             \
2389   develop(bool, CIPrintMethodCodes, false,                                  \
2390           "print method bytecodes of the compiled code")                    \
2391                                                                             \
2392   develop(bool, CIPrintTypeFlow, false,                                     \
2393           "print the results of ciTypeFlow analysis")                       \
2394                                                                             \
2395   develop(bool, CITraceTypeFlow, false,                                     \
2396           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2397                                                                             \
2398   develop(intx, OSROnlyBCI, -1,                                             \
2399           "OSR only at this bci.  Negative values mean exclude that bci")   \
2400                                                                             \
2401   /* compiler */                                                            \
2402                                                                             \
2403   /* notice: the max range value here is max_jint, not max_intx  */         \
2404   /* because of overflow issue                                   */         \
2405   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2406           "Number of compiler threads to run")                              \
2407           range(0, max_jint)                                                \
2408           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2409                                                                             \
2410   product(intx, CompilationPolicyChoice, 0,                                 \
2411           "which compilation policy (0-3)")                                 \
2412           range(0, 3)                                                       \
2413                                                                             \
2414   develop(bool, UseStackBanging, true,                                      \
2415           "use stack banging for stack overflow checks (required for "      \
2416           "proper StackOverflow handling; disable only to measure cost "    \
2417           "of stackbanging)")                                               \
2418                                                                             \
2419   develop(bool, UseStrictFP, true,                                          \
2420           "use strict fp if modifier strictfp is set")                      \
2421                                                                             \
2422   develop(bool, GenerateSynchronizationCode, true,                          \
2423           "generate locking/unlocking code for synchronized methods and "   \
2424           "monitors")                                                       \
2425                                                                             \
2426   develop(bool, GenerateRangeChecks, true,                                  \
2427           "Generate range checks for array accesses")                       \
2428                                                                             \
2429   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2430           "Generate code for implicit null checks")                         \
2431                                                                             \
2432   product_pd(bool, TrapBasedNullChecks,                                     \
2433           "Generate code for null checks that uses a cmp and trap "         \
2434           "instruction raising SIGTRAP.  This is only used if an access to" \
2435           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2436           "ImplicitNullChecks don't work (PPC64).")                         \
2437                                                                             \
2438   product(bool, PrintSafepointStatistics, false,                            \
2439           "Print statistics about safepoint synchronization")               \
2440                                                                             \
2441   product(intx, PrintSafepointStatisticsCount, 300,                         \
2442           "Total number of safepoint statistics collected "                 \
2443           "before printing them out")                                       \
2444           range(1, max_intx)                                                \
2445                                                                             \
2446   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2447           "Print safepoint statistics only when safepoint takes "           \
2448           "more than PrintSafepointSatisticsTimeout in millis")             \
2449   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2450   NOT_LP64(range(-1, max_intx))                                             \
2451                                                                             \
2452   product(bool, Inline, true,                                               \
2453           "Enable inlining")                                                \
2454                                                                             \
2455   product(bool, ClipInlining, true,                                         \
2456           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2457                                                                             \
2458   develop(bool, UseCHA, true,                                               \
2459           "Enable CHA")                                                     \
2460                                                                             \
2461   product(bool, UseTypeProfile, true,                                       \
2462           "Check interpreter profile for historically monomorphic calls")   \
2463                                                                             \
2464   diagnostic(bool, PrintInlining, false,                                    \
2465           "Print inlining optimizations")                                   \
2466                                                                             \
2467   product(bool, UsePopCountInstruction, false,                              \
2468           "Use population count instruction")                               \
2469                                                                             \
2470   develop(bool, EagerInitialization, false,                                 \
2471           "Eagerly initialize classes if possible")                         \
2472                                                                             \
2473   diagnostic(bool, LogTouchedMethods, false,                                \
2474           "Log methods which have been ever touched in runtime")            \
2475                                                                             \
2476   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2477           "Print all methods that have been ever touched in runtime")       \
2478                                                                             \
2479   develop(bool, TraceMethodReplacement, false,                              \
2480           "Print when methods are replaced do to recompilation")            \
2481                                                                             \
2482   develop(bool, PrintMethodFlushing, false,                                 \
2483           "Print the nmethods being flushed")                               \
2484                                                                             \
2485   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2486           "print statistics about method flushing")                         \
2487                                                                             \
2488   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2489           "Number of compiled code invocations after which "                \
2490           "the method is considered as hot by the flusher")                 \
2491           range(1, max_jint)                                                \
2492                                                                             \
2493   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2494           "Minimum number of sweeper passes before an nmethod "             \
2495           "can be flushed")                                                 \
2496           range(0, max_intx)                                                \
2497                                                                             \
2498   product(bool, UseCodeAging, true,                                         \
2499           "Insert counter to detect warm methods")                          \
2500                                                                             \
2501   diagnostic(bool, StressCodeAging, false,                                  \
2502           "Start with counters compiled in")                                \
2503                                                                             \
2504   develop(bool, UseRelocIndex, false,                                       \
2505           "Use an index to speed random access to relocations")             \
2506                                                                             \
2507   develop(bool, StressCodeBuffers, false,                                   \
2508           "Exercise code buffer expansion and other rare state changes")    \
2509                                                                             \
2510   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2511           "Generate extra debugging information for non-safepoints in "     \
2512           "nmethods")                                                       \
2513                                                                             \
2514   product(bool, PrintVMOptions, false,                                      \
2515           "Print flags that appeared on the command line")                  \
2516                                                                             \
2517   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2518           "Ignore unrecognized VM options")                                 \
2519                                                                             \
2520   product(bool, PrintCommandLineFlags, false,                               \
2521           "Print flags specified on command line or set by ergonomics")     \
2522                                                                             \
2523   product(bool, PrintFlagsInitial, false,                                   \
2524           "Print all VM flags before argument processing and exit VM")      \
2525                                                                             \
2526   product(bool, PrintFlagsFinal, false,                                     \
2527           "Print all VM flags after argument and ergonomic processing")     \
2528                                                                             \
2529   notproduct(bool, PrintFlagsWithComments, false,                           \
2530           "Print all VM flags with default values and descriptions and "    \
2531           "exit")                                                           \
2532                                                                             \
2533   product(bool, PrintFlagsRanges, false,                                    \
2534           "Print VM flags and their ranges and exit VM")                    \
2535                                                                             \
2536   diagnostic(bool, SerializeVMOutput, true,                                 \
2537           "Use a mutex to serialize output to tty and LogFile")             \
2538                                                                             \
2539   diagnostic(bool, DisplayVMOutput, true,                                   \
2540           "Display all VM output on the tty, independently of LogVMOutput") \
2541                                                                             \
2542   diagnostic(bool, LogVMOutput, false,                                      \
2543           "Save VM output to LogFile")                                      \
2544                                                                             \
2545   diagnostic(ccstr, LogFile, NULL,                                          \
2546           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2547           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2548                                                                             \
2549   product(ccstr, ErrorFile, NULL,                                           \
2550           "If an error occurs, save the error data to this file "           \
2551           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2552                                                                             \
2553   product(bool, DisplayVMOutputToStderr, false,                             \
2554           "If DisplayVMOutput is true, display all VM output to stderr")    \
2555                                                                             \
2556   product(bool, DisplayVMOutputToStdout, false,                             \
2557           "If DisplayVMOutput is true, display all VM output to stdout")    \
2558                                                                             \
2559   product(bool, UseHeavyMonitors, false,                                    \
2560           "use heavyweight instead of lightweight Java monitors")           \
2561                                                                             \
2562   product(bool, PrintStringTableStatistics, false,                          \
2563           "print statistics about the StringTable and SymbolTable")         \
2564                                                                             \
2565   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2566           "verify StringTable contents at exit")                            \
2567                                                                             \
2568   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2569           "print histogram of the symbol table")                            \
2570                                                                             \
2571   notproduct(bool, ExitVMOnVerifyError, false,                              \
2572           "standard exit from VM if bytecode verify error "                 \
2573           "(only in debug mode)")                                           \
2574                                                                             \
2575   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2576           "Call fatal if this exception is thrown.  Example: "              \
2577           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2578                                                                             \
2579   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2580           "Call fatal if the exception pointed by AbortVMOnException "      \
2581           "has this message")                                               \
2582                                                                             \
2583   develop(bool, DebugVtables, false,                                        \
2584           "add debugging code to vtable dispatch")                          \
2585                                                                             \
2586   notproduct(bool, PrintVtableStats, false,                                 \
2587           "print vtables stats at end of run")                              \
2588                                                                             \
2589   develop(bool, TraceCreateZombies, false,                                  \
2590           "trace creation of zombie nmethods")                              \
2591                                                                             \
2592   notproduct(bool, IgnoreLockingAssertions, false,                          \
2593           "disable locking assertions (for speed)")                         \
2594                                                                             \
2595   product(bool, RangeCheckElimination, true,                                \
2596           "Eliminate range checks")                                         \
2597                                                                             \
2598   develop_pd(bool, UncommonNullCast,                                        \
2599           "track occurrences of null in casts; adjust compiler tactics")    \
2600                                                                             \
2601   develop(bool, TypeProfileCasts,  true,                                    \
2602           "treat casts like calls for purposes of type profiling")          \
2603                                                                             \
2604   develop(bool, DelayCompilationDuringStartup, true,                        \
2605           "Delay invoking the compiler until main application class is "    \
2606           "loaded")                                                         \
2607                                                                             \
2608   develop(bool, CompileTheWorld, false,                                     \
2609           "Compile all methods in all classes in bootstrap class path "     \
2610             "(stress test)")                                                \
2611                                                                             \
2612   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2613           "Preload all classes used by a class before start loading")       \
2614                                                                             \
2615   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2616           "Force a safepoint every n compiles so sweeper can keep up")      \
2617                                                                             \
2618   develop(bool, FillDelaySlots, true,                                       \
2619           "Fill delay slots (on SPARC only)")                               \
2620                                                                             \
2621   develop(bool, TimeLivenessAnalysis, false,                                \
2622           "Time computation of bytecode liveness analysis")                 \
2623                                                                             \
2624   develop(bool, TraceLivenessGen, false,                                    \
2625           "Trace the generation of liveness analysis information")          \
2626                                                                             \
2627   notproduct(bool, TraceLivenessQuery, false,                               \
2628           "Trace queries of liveness analysis information")                 \
2629                                                                             \
2630   notproduct(bool, CollectIndexSetStatistics, false,                        \
2631           "Collect information about IndexSets")                            \
2632                                                                             \
2633   develop(bool, UseLoopSafepoints, true,                                    \
2634           "Generate Safepoint nodes in every loop")                         \
2635                                                                             \
2636   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2637           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2638           "Inline allocations larger than this in doublewords must go slow")\
2639                                                                             \
2640   product(bool, AggressiveOpts, false,                                      \
2641           "Enable aggressive optimizations - see arguments.cpp")            \
2642                                                                             \
2643   product_pd(bool, CompactStrings,                                          \
2644           "Enable Strings to use single byte chars in backing store")       \
2645                                                                             \
2646   product_pd(uintx, TypeProfileLevel,                                       \
2647           "=XYZ, with Z: Type profiling of arguments at call; "             \
2648                      "Y: Type profiling of return value at call; "          \
2649                      "X: Type profiling of parameters to methods; "         \
2650           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2651           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2652                                                                             \
2653   product(intx, TypeProfileArgsLimit,     2,                                \
2654           "max number of call arguments to consider for type profiling")    \
2655           range(0, 16)                                                      \
2656                                                                             \
2657   product(intx, TypeProfileParmsLimit,    2,                                \
2658           "max number of incoming parameters to consider for type profiling"\
2659           ", -1 for all")                                                   \
2660           range(-1, 64)                                                     \
2661                                                                             \
2662   /* statistics */                                                          \
2663   develop(bool, CountCompiledCalls, false,                                  \
2664           "Count method invocations")                                       \
2665                                                                             \
2666   notproduct(bool, CountRuntimeCalls, false,                                \
2667           "Count VM runtime calls")                                         \
2668                                                                             \
2669   develop(bool, CountJNICalls, false,                                       \
2670           "Count jni method invocations")                                   \
2671                                                                             \
2672   notproduct(bool, CountJVMCalls, false,                                    \
2673           "Count jvm method invocations")                                   \
2674                                                                             \
2675   notproduct(bool, CountRemovableExceptions, false,                         \
2676           "Count exceptions that could be replaced by branches due to "     \
2677           "inlining")                                                       \
2678                                                                             \
2679   notproduct(bool, ICMissHistogram, false,                                  \
2680           "Produce histogram of IC misses")                                 \
2681                                                                             \
2682   /* interpreter */                                                         \
2683   product_pd(bool, RewriteBytecodes,                                        \
2684           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2685                                                                             \
2686   product_pd(bool, RewriteFrequentPairs,                                    \
2687           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2688                                                                             \
2689   diagnostic(bool, PrintInterpreter, false,                                 \
2690           "Print the generated interpreter code")                           \
2691                                                                             \
2692   product(bool, UseInterpreter, true,                                       \
2693           "Use interpreter for non-compiled methods")                       \
2694                                                                             \
2695   develop(bool, UseFastSignatureHandlers, true,                             \
2696           "Use fast signature handlers for native calls")                   \
2697                                                                             \
2698   product(bool, UseLoopCounter, true,                                       \
2699           "Increment invocation counter on backward branch")                \
2700                                                                             \
2701   product_pd(bool, UseOnStackReplacement,                                   \
2702           "Use on stack replacement, calls runtime if invoc. counter "      \
2703           "overflows in loop")                                              \
2704                                                                             \
2705   notproduct(bool, TraceOnStackReplacement, false,                          \
2706           "Trace on stack replacement")                                     \
2707                                                                             \
2708   product_pd(bool, PreferInterpreterNativeStubs,                            \
2709           "Use always interpreter stubs for native methods invoked via "    \
2710           "interpreter")                                                    \
2711                                                                             \
2712   develop(bool, CountBytecodes, false,                                      \
2713           "Count number of bytecodes executed")                             \
2714                                                                             \
2715   develop(bool, PrintBytecodeHistogram, false,                              \
2716           "Print histogram of the executed bytecodes")                      \
2717                                                                             \
2718   develop(bool, PrintBytecodePairHistogram, false,                          \
2719           "Print histogram of the executed bytecode pairs")                 \
2720                                                                             \
2721   diagnostic(bool, PrintSignatureHandlers, false,                           \
2722           "Print code generated for native method signature handlers")      \
2723                                                                             \
2724   develop(bool, VerifyOops, false,                                          \
2725           "Do plausibility checks for oops")                                \
2726                                                                             \
2727   develop(bool, CheckUnhandledOops, false,                                  \
2728           "Check for unhandled oops in VM code")                            \
2729                                                                             \
2730   develop(bool, VerifyJNIFields, trueInDebug,                               \
2731           "Verify jfieldIDs for instance fields")                           \
2732                                                                             \
2733   notproduct(bool, VerifyJNIEnvThread, false,                               \
2734           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2735           "from JNI")                                                       \
2736                                                                             \
2737   develop(bool, VerifyFPU, false,                                           \
2738           "Verify FPU state (check for NaN's, etc.)")                       \
2739                                                                             \
2740   develop(bool, VerifyThread, false,                                        \
2741           "Watch the thread register for corruption (SPARC only)")          \
2742                                                                             \
2743   develop(bool, VerifyActivationFrameSize, false,                           \
2744           "Verify that activation frame didn't become smaller than its "    \
2745           "minimal size")                                                   \
2746                                                                             \
2747   develop(bool, TraceFrequencyInlining, false,                              \
2748           "Trace frequency based inlining")                                 \
2749                                                                             \
2750   develop_pd(bool, InlineIntrinsics,                                        \
2751           "Inline intrinsics that can be statically resolved")              \
2752                                                                             \
2753   product_pd(bool, ProfileInterpreter,                                      \
2754           "Profile at the bytecode level during interpretation")            \
2755                                                                             \
2756   develop(bool, TraceProfileInterpreter, false,                             \
2757           "Trace profiling at the bytecode level during interpretation. "   \
2758           "This outputs the profiling information collected to improve "    \
2759           "jit compilation.")                                               \
2760                                                                             \
2761   develop_pd(bool, ProfileTraps,                                            \
2762           "Profile deoptimization traps at the bytecode level")             \
2763                                                                             \
2764   product(intx, ProfileMaturityPercentage, 20,                              \
2765           "number of method invocations/branches (expressed as % of "       \
2766           "CompileThreshold) before using the method's profile")            \
2767           range(0, 100)                                                     \
2768                                                                             \
2769   diagnostic(bool, PrintMethodData, false,                                  \
2770           "Print the results of +ProfileInterpreter at end of run")         \
2771                                                                             \
2772   develop(bool, VerifyDataPointer, trueInDebug,                             \
2773           "Verify the method data pointer during interpreter profiling")    \
2774                                                                             \
2775   develop(bool, VerifyCompiledCode, false,                                  \
2776           "Include miscellaneous runtime verifications in nmethod code; "   \
2777           "default off because it disturbs nmethod size heuristics")        \
2778                                                                             \
2779   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2780           "Manually make GC thread crash then dump java stack trace;  "     \
2781           "Test only")                                                      \
2782                                                                             \
2783   /* compilation */                                                         \
2784   product(bool, UseCompiler, true,                                          \
2785           "Use Just-In-Time compilation")                                   \
2786                                                                             \
2787   develop(bool, TraceCompilationPolicy, false,                              \
2788           "Trace compilation policy")                                       \
2789                                                                             \
2790   develop(bool, TimeCompilationPolicy, false,                               \
2791           "Time the compilation policy")                                    \
2792                                                                             \
2793   product(bool, UseCounterDecay, true,                                      \
2794           "Adjust recompilation counters")                                  \
2795                                                                             \
2796   develop(intx, CounterHalfLifeTime,    30,                                 \
2797           "Half-life time of invocation counters (in seconds)")             \
2798                                                                             \
2799   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2800           "The minimum interval (in milliseconds) between invocation of "   \
2801           "CounterDecay")                                                   \
2802                                                                             \
2803   product(bool, AlwaysCompileLoopMethods, false,                            \
2804           "When using recompilation, never interpret methods "              \
2805           "containing loops")                                               \
2806                                                                             \
2807   product(bool, DontCompileHugeMethods, true,                               \
2808           "Do not compile methods > HugeMethodLimit")                       \
2809                                                                             \
2810   /* Bytecode escape analysis estimation. */                                \
2811   product(bool, EstimateArgEscape, true,                                    \
2812           "Analyze bytecodes to estimate escape state of arguments")        \
2813                                                                             \
2814   product(intx, BCEATraceLevel, 0,                                          \
2815           "How much tracing to do of bytecode escape analysis estimates "   \
2816           "(0-3)")                                                          \
2817           range(0, 3)                                                       \
2818                                                                             \
2819   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2820           "Maximum number of nested calls that are analyzed by BC EA")      \
2821           range(0, max_jint)                                                \
2822                                                                             \
2823   product(intx, MaxBCEAEstimateSize, 150,                                   \
2824           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2825           range(0, max_jint)                                                \
2826                                                                             \
2827   product(intx,  AllocatePrefetchStyle, 1,                                  \
2828           "0 = no prefetch, "                                               \
2829           "1 = generate prefetch instructions for each allocation, "        \
2830           "2 = use TLAB watermark to gate allocation prefetch, "            \
2831           "3 = generate one prefetch instruction per cache line")           \
2832           range(0, 3)                                                       \
2833                                                                             \
2834   product(intx,  AllocatePrefetchDistance, -1,                              \
2835           "Distance to prefetch ahead of allocation pointer. "              \
2836           "-1: use system-specific value (automatically determined")        \
2837           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2838                                                                             \
2839   product(intx,  AllocatePrefetchLines, 3,                                  \
2840           "Number of lines to prefetch ahead of array allocation pointer")  \
2841           range(1, 64)                                                      \
2842                                                                             \
2843   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2844           "Number of lines to prefetch ahead of instance allocation "       \
2845           "pointer")                                                        \
2846           range(1, 64)                                                      \
2847                                                                             \
2848   product(intx,  AllocatePrefetchStepSize, 16,                              \
2849           "Step size in bytes of sequential prefetch instructions")         \
2850           range(1, 512)                                                     \
2851           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2852                                                                             \
2853   product(intx,  AllocatePrefetchInstr, 0,                                  \
2854           "Select instruction to prefetch ahead of allocation pointer")     \
2855           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2856                                                                             \
2857   /* deoptimization */                                                      \
2858   develop(bool, TraceDeoptimization, false,                                 \
2859           "Trace deoptimization")                                           \
2860                                                                             \
2861   develop(bool, PrintDeoptimizationDetails, false,                          \
2862           "Print more information about deoptimization")                    \
2863                                                                             \
2864   develop(bool, DebugDeoptimization, false,                                 \
2865           "Tracing various information while debugging deoptimization")     \
2866                                                                             \
2867   product(intx, SelfDestructTimer, 0,                                       \
2868           "Will cause VM to terminate after a given time (in minutes) "     \
2869           "(0 means off)")                                                  \
2870           range(0, max_intx)                                                \
2871                                                                             \
2872   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2873           "The maximum number of lines in the stack trace for Java "        \
2874           "exceptions (0 means all)")                                       \
2875           range(0, max_jint/2)                                              \
2876                                                                             \
2877   /* notice: the max range value here is max_jint, not max_intx  */         \
2878   /* because of overflow issue                                   */         \
2879   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2880           "Guarantee a safepoint (at least) every so many milliseconds "    \
2881           "(0 means none)")                                                 \
2882           range(0, max_jint)                                                \
2883                                                                             \
2884   product(intx, SafepointTimeoutDelay, 10000,                               \
2885           "Delay in milliseconds for option SafepointTimeout")              \
2886   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2887   NOT_LP64(range(0, max_intx))                                              \
2888                                                                             \
2889   product(intx, NmethodSweepActivity, 10,                                   \
2890           "Removes cold nmethods from code cache if > 0. Higher values "    \
2891           "result in more aggressive sweeping")                             \
2892           range(0, 2000)                                                    \
2893                                                                             \
2894   notproduct(bool, LogSweeper, false,                                       \
2895           "Keep a ring buffer of sweeper activity")                         \
2896                                                                             \
2897   notproduct(intx, SweeperLogEntries, 1024,                                 \
2898           "Number of records in the ring buffer of sweeper activity")       \
2899                                                                             \
2900   notproduct(intx, MemProfilingInterval, 500,                               \
2901           "Time between each invocation of the MemProfiler")                \
2902                                                                             \
2903   develop(intx, MallocCatchPtr, -1,                                         \
2904           "Hit breakpoint when mallocing/freeing this pointer")             \
2905                                                                             \
2906   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2907           "List of assertions (file:line) to muzzle")                       \
2908                                                                             \
2909   develop(intx, StackPrintLimit, 100,                                       \
2910           "number of stack frames to print in VM-level stack dump")         \
2911                                                                             \
2912   notproduct(intx, MaxElementPrintSize, 256,                                \
2913           "maximum number of elements to print")                            \
2914                                                                             \
2915   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2916           "maximum number of subklasses to print when printing klass")      \
2917                                                                             \
2918   product(intx, MaxInlineLevel, 9,                                          \
2919           "maximum number of nested calls that are inlined")                \
2920           range(0, max_jint)                                                \
2921                                                                             \
2922   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2923           "maximum number of nested recursive calls that are inlined")      \
2924           range(0, max_jint)                                                \
2925                                                                             \
2926   develop(intx, MaxForceInlineLevel, 100,                                   \
2927           "maximum number of nested calls that are forced for inlining "    \
2928           "(using CompileCommand or marked w/ @ForceInline)")               \
2929           range(0, max_jint)                                                \
2930                                                                             \
2931   product_pd(intx, InlineSmallCode,                                         \
2932           "Only inline already compiled methods if their code size is "     \
2933           "less than this")                                                 \
2934           range(0, max_jint)                                                \
2935                                                                             \
2936   product(intx, MaxInlineSize, 35,                                          \
2937           "The maximum bytecode size of a method to be inlined")            \
2938           range(0, max_jint)                                                \
2939                                                                             \
2940   product_pd(intx, FreqInlineSize,                                          \
2941           "The maximum bytecode size of a frequent method to be inlined")   \
2942           range(0, max_jint)                                                \
2943                                                                             \
2944   product(intx, MaxTrivialSize, 6,                                          \
2945           "The maximum bytecode size of a trivial method to be inlined")    \
2946           range(0, max_jint)                                                \
2947                                                                             \
2948   product(intx, MinInliningThreshold, 250,                                  \
2949           "The minimum invocation count a method needs to have to be "      \
2950           "inlined")                                                        \
2951           range(0, max_jint)                                                \
2952                                                                             \
2953   develop(intx, MethodHistogramCutoff, 100,                                 \
2954           "The cutoff value for method invocation histogram (+CountCalls)") \
2955                                                                             \
2956   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2957           "Number of interpreted methods to show in profile")               \
2958                                                                             \
2959   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2960           "Number of compiled methods to show in profile")                  \
2961                                                                             \
2962   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2963           "Number of stub methods to show in profile")                      \
2964                                                                             \
2965   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2966           "Number of runtime stub nodes to show in profile")                \
2967                                                                             \
2968   product(intx, ProfileIntervalsTicks, 100,                                 \
2969           "Number of ticks between printing of interval profile "           \
2970           "(+ProfileIntervals)")                                            \
2971           range(0, max_intx)                                                \
2972                                                                             \
2973   notproduct(intx, ScavengeALotInterval,     1,                             \
2974           "Interval between which scavenge will occur with +ScavengeALot")  \
2975                                                                             \
2976   notproduct(intx, FullGCALotInterval,     1,                               \
2977           "Interval between which full gc will occur with +FullGCALot")     \
2978                                                                             \
2979   notproduct(intx, FullGCALotStart,     0,                                  \
2980           "For which invocation to start FullGCAlot")                       \
2981                                                                             \
2982   notproduct(intx, FullGCALotDummies,  32*K,                                \
2983           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2984           "to move")                                                        \
2985                                                                             \
2986   develop(intx, DontYieldALotInterval,    10,                               \
2987           "Interval between which yields will be dropped (milliseconds)")   \
2988                                                                             \
2989   develop(intx, ProfilerPCTickThreshold,    15,                             \
2990           "Number of ticks in a PC buckets to be a hotspot")                \
2991                                                                             \
2992   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2993           "Number of exits until DeoptimizeALot kicks in")                  \
2994                                                                             \
2995   notproduct(intx, ZombieALotInterval,     5,                               \
2996           "Number of exits until ZombieALot kicks in")                      \
2997                                                                             \
2998   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2999           "If non-zero, maximum number of words that malloc/realloc can "   \
3000           "allocate (for testing only)")                                    \
3001           range(0, max_uintx)                                               \
3002                                                                             \
3003   product(intx, TypeProfileWidth, 2,                                        \
3004           "Number of receiver types to record in call/cast profile")        \
3005           range(0, 8)                                                       \
3006                                                                             \
3007   develop(intx, BciProfileWidth,      2,                                    \
3008           "Number of return bci's to record in ret profile")                \
3009                                                                             \
3010   product(intx, PerMethodRecompilationCutoff, 400,                          \
3011           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3012           range(-1, max_intx)                                               \
3013                                                                             \
3014   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3015           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3016           range(-1, max_intx)                                               \
3017                                                                             \
3018   product(intx, PerMethodTrapLimit,  100,                                   \
3019           "Limit on traps (of one kind) in a method (includes inlines)")    \
3020           range(0, max_jint)                                                \
3021                                                                             \
3022   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3023           "Limit on speculative traps (of one kind) in a method "           \
3024           "(includes inlines)")                                             \
3025           range(0, max_jint)                                                \
3026                                                                             \
3027   product(intx, PerBytecodeTrapLimit,  4,                                   \
3028           "Limit on traps (of one kind) at a particular BCI")               \
3029           range(0, max_jint)                                                \
3030                                                                             \
3031   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3032           "Extra method data trap entries for speculation")                 \
3033                                                                             \
3034   develop(intx, InlineFrequencyRatio,    20,                                \
3035           "Ratio of call site execution to caller method invocation")       \
3036           range(0, max_jint)                                                \
3037                                                                             \
3038   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3039           "Count of call site execution necessary to trigger frequent "     \
3040           "inlining")                                                       \
3041           range(0, max_jint)                                                \
3042                                                                             \
3043   develop(intx, InlineThrowCount,    50,                                    \
3044           "Force inlining of interpreted methods that throw this often")    \
3045           range(0, max_jint)                                                \
3046                                                                             \
3047   develop(intx, InlineThrowMaxSize,   200,                                  \
3048           "Force inlining of throwing methods smaller than this")           \
3049           range(0, max_jint)                                                \
3050                                                                             \
3051   develop(intx, ProfilerNodeSize,  1024,                                    \
3052           "Size in K to allocate for the Profile Nodes of each thread")     \
3053           range(0, 1024)                                                    \
3054                                                                             \
3055   /* gc parameters */                                                       \
3056   product(size_t, InitialHeapSize, 0,                                       \
3057           "Initial heap size (in bytes); zero means use ergonomics")        \
3058           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3059                                                                             \
3060   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3061           "Maximum heap size (in bytes)")                                   \
3062           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3063                                                                             \
3064   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3065           "Initial tenured generation size (in bytes)")                     \
3066           range(0, max_uintx)                                               \
3067                                                                             \
3068   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3069           "Initial new generation size (in bytes)")                         \
3070           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3071                                                                             \
3072   product(size_t, MaxNewSize, max_uintx,                                    \
3073           "Maximum new generation size (in bytes), max_uintx means set "    \
3074           "ergonomically")                                                  \
3075           range(0, max_uintx)                                               \
3076                                                                             \
3077   product_pd(size_t, HeapBaseMinAddress,                                    \
3078           "OS specific low limit for heap base address")                    \
3079           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3080                                                                             \
3081   product(size_t, PretenureSizeThreshold, 0,                                \
3082           "Maximum size in bytes of objects allocated in DefNew "           \
3083           "generation; zero means no maximum")                              \
3084           range(0, max_uintx)                                               \
3085                                                                             \
3086   product(size_t, MinTLABSize, 2*K,                                         \
3087           "Minimum allowed TLAB size (in bytes)")                           \
3088           range(1, max_uintx/2)                                             \
3089           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3090                                                                             \
3091   product(size_t, TLABSize, 0,                                              \
3092           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3093           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3094                                                                             \
3095   product(size_t, YoungPLABSize, 4096,                                      \
3096           "Size of young gen promotion LAB's (in HeapWords)")               \
3097           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3098                                                                             \
3099   product(size_t, OldPLABSize, 1024,                                        \
3100           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3101           "of blocks to attempt to claim when refilling CMS LAB's")         \
3102           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3103                                                                             \
3104   product(uintx, TLABAllocationWeight, 35,                                  \
3105           "Allocation averaging weight")                                    \
3106           range(0, 100)                                                     \
3107                                                                             \
3108   /* Limit the lower bound of this flag to 1 as it is used  */              \
3109   /* in a division expression.                              */              \
3110   product(uintx, TLABWasteTargetPercent, 1,                                 \
3111           "Percentage of Eden that can be wasted")                          \
3112           range(1, 100)                                                     \
3113                                                                             \
3114   product(uintx, TLABRefillWasteFraction,    64,                            \
3115           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3116           range(1, max_juint)                                               \
3117                                                                             \
3118   product(uintx, TLABWasteIncrement,    4,                                  \
3119           "Increment allowed waste at slow allocation")                     \
3120           range(0, max_jint)                                                \
3121           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3122                                                                             \
3123   product(uintx, SurvivorRatio, 8,                                          \
3124           "Ratio of eden/survivor space size")                              \
3125           range(1, max_uintx-2)                                             \
3126           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3127                                                                             \
3128   product(uintx, NewRatio, 2,                                               \
3129           "Ratio of old/new generation sizes")                              \
3130           range(0, max_uintx-1)                                             \
3131                                                                             \
3132   product_pd(size_t, NewSizeThreadIncrease,                                 \
3133           "Additional size added to desired new generation size per "       \
3134           "non-daemon thread (in bytes)")                                   \
3135           range(0, max_uintx)                                               \
3136                                                                             \
3137   product_pd(size_t, MetaspaceSize,                                         \
3138           "Initial threshold (in bytes) at which a garbage collection "     \
3139           "is done to reduce Metaspace usage")                              \
3140           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3141                                                                             \
3142   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3143           "Maximum size of Metaspaces (in bytes)")                          \
3144           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3145                                                                             \
3146   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3147           "Maximum size of class area in Metaspace when compressed "        \
3148           "class pointers are used")                                        \
3149           range(1*M, 3*G)                                                   \
3150                                                                             \
3151   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3152           "The minimum percentage of heap free after GC to avoid expansion."\
3153           " For most GCs this applies to the old generation. In G1 and"     \
3154           " ParallelGC it applies to the whole heap.")                      \
3155           range(0, 100)                                                     \
3156           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3157                                                                             \
3158   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3159           "The maximum percentage of heap free after GC to avoid shrinking."\
3160           " For most GCs this applies to the old generation. In G1 and"     \
3161           " ParallelGC it applies to the whole heap.")                      \
3162           range(0, 100)                                                     \
3163           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3164                                                                             \
3165   product(bool, ShrinkHeapInSteps, true,                                    \
3166           "When disabled, informs the GC to shrink the java heap directly"  \
3167           " to the target size at the next full GC rather than requiring"   \
3168           " smaller steps during multiple full GCs.")                       \
3169                                                                             \
3170   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3171           "Number of milliseconds per MB of free space in the heap")        \
3172           range(0, max_intx)                                                \
3173           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3174                                                                             \
3175   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3176           "The minimum change in heap space due to GC (in bytes)")          \
3177           range(0, max_uintx)                                               \
3178                                                                             \
3179   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3180           "The minimum expansion of Metaspace (in bytes)")                  \
3181           range(0, max_uintx)                                               \
3182                                                                             \
3183   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3184           "The maximum percentage of Metaspace free after GC to avoid "     \
3185           "shrinking")                                                      \
3186           range(0, 100)                                                     \
3187           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3188                                                                             \
3189   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3190           "The minimum percentage of Metaspace free after GC to avoid "     \
3191           "expansion")                                                      \
3192           range(0, 99)                                                      \
3193           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3194                                                                             \
3195   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3196           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3197           range(0, max_uintx)                                               \
3198                                                                             \
3199   product(uintx, QueuedAllocationWarningCount, 0,                           \
3200           "Number of times an allocation that queues behind a GC "          \
3201           "will retry before printing a warning")                           \
3202           range(0, max_uintx)                                               \
3203                                                                             \
3204   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3205           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3206           range(0, max_uintx)                                               \
3207                                                                             \
3208   diagnostic(intx, VerifyGCLevel,     0,                                    \
3209           "Generation level at which to start +VerifyBefore/AfterGC")       \
3210           range(0, 1)                                                       \
3211                                                                             \
3212   product(uintx, MaxTenuringThreshold,    15,                               \
3213           "Maximum value for tenuring threshold")                           \
3214           range(0, markOopDesc::max_age + 1)                                \
3215           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3216                                                                             \
3217   product(uintx, InitialTenuringThreshold,    7,                            \
3218           "Initial value for tenuring threshold")                           \
3219           range(0, markOopDesc::max_age + 1)                                \
3220           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3221                                                                             \
3222   product(uintx, TargetSurvivorRatio,    50,                                \
3223           "Desired percentage of survivor space used after scavenge")       \
3224           range(0, 100)                                                     \
3225                                                                             \
3226   product(uintx, MarkSweepDeadRatio,     5,                                 \
3227           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3228           "Serial mark sweep treats this as both the minimum and maximum "  \
3229           "value. "                                                         \
3230           "CMS uses this value only if it falls back to mark sweep. "       \
3231           "Par compact uses a variable scale based on the density of the "  \
3232           "generation and treats this as the maximum value when the heap "  \
3233           "is either completely full or completely empty.  Par compact "    \
3234           "also has a smaller default value; see arguments.cpp.")           \
3235           range(0, 100)                                                     \
3236                                                                             \
3237   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3238           "How often should we fully compact the heap (ignoring the dead "  \
3239           "space parameters)")                                              \
3240           range(1, max_juint)                                               \
3241                                                                             \
3242   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3243           "Delay between expansion and allocation (in milliseconds)")       \
3244                                                                             \
3245   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3246           "Delay in scheduling GC workers (in milliseconds)")               \
3247                                                                             \
3248   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3249           "(Unstable) Number of times to iterate in safepoint loop "        \
3250           "before blocking VM threads ")                                    \
3251           range(-1, max_jint-1)                                             \
3252                                                                             \
3253   product(intx, DeferPollingPageLoopCount,     -1,                          \
3254           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3255           "before changing safepoint polling page to RO ")                  \
3256           range(-1, max_jint-1)                                             \
3257                                                                             \
3258   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3259           range(0, max_intx)                                                \
3260                                                                             \
3261   product(bool, PSChunkLargeArrays, true,                                   \
3262           "Process large arrays in chunks")                                 \
3263                                                                             \
3264   product(uintx, GCDrainStackTargetSize, 64,                                \
3265           "Number of entries we will try to leave on the stack "            \
3266           "during parallel gc")                                             \
3267           range(0, max_juint)                                               \
3268                                                                             \
3269   /* stack parameters */                                                    \
3270   product_pd(intx, StackYellowPages,                                        \
3271           "Number of yellow zone (recoverable overflows) pages of size "    \
3272           "4KB. If pages are bigger yellow zone is aligned up.")            \
3273           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3274                                                                             \
3275   product_pd(intx, StackRedPages,                                           \
3276           "Number of red zone (unrecoverable overflows) pages of size "     \
3277           "4KB. If pages are bigger red zone is aligned up.")               \
3278           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3279                                                                             \
3280   product_pd(intx, StackReservedPages,                                      \
3281           "Number of reserved zone (reserved to annotated methods) pages"   \
3282           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3283           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3284                                                                             \
3285   product(bool, RestrictReservedStack, true,                                \
3286           "Restrict @ReservedStackAccess to trusted classes")               \
3287                                                                             \
3288   /* greater stack shadow pages can't generate instruction to bang stack */ \
3289   product_pd(intx, StackShadowPages,                                        \
3290           "Number of shadow zone (for overflow checking) pages of size "    \
3291           "4KB. If pages are bigger shadow zone is aligned up. "            \
3292           "This should exceed the depth of the VM and native call stack.")  \
3293           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3294                                                                             \
3295   product_pd(intx, ThreadStackSize,                                         \
3296           "Thread Stack Size (in Kbytes)")                                  \
3297           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3298                                                                             \
3299   product_pd(intx, VMThreadStackSize,                                       \
3300           "Non-Java Thread Stack Size (in Kbytes)")                         \
3301           range(0, max_intx/(1 * K))                                        \
3302                                                                             \
3303   product_pd(intx, CompilerThreadStackSize,                                 \
3304           "Compiler Thread Stack Size (in Kbytes)")                         \
3305           range(0, max_intx/(1 * K))                                        \
3306                                                                             \
3307   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3308           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3309                                                                             \
3310   /* code cache parameters                                    */            \
3311   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3312           "Code cache segment size (in bytes) - smallest unit of "          \
3313           "allocation")                                                     \
3314           range(1, 1024)                                                    \
3315           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3316                                                                             \
3317   develop_pd(intx, CodeEntryAlignment,                                      \
3318           "Code entry alignment for generated code (in bytes)")             \
3319           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3320                                                                             \
3321   product_pd(intx, OptoLoopAlignment,                                       \
3322           "Align inner loops to zero relative to this modulus")             \
3323           range(1, 16)                                                      \
3324           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3325                                                                             \
3326   product_pd(uintx, InitialCodeCacheSize,                                   \
3327           "Initial code cache size (in bytes)")                             \
3328           range(0, max_uintx)                                               \
3329                                                                             \
3330   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3331           "Minimum code cache size (in bytes) required to start VM.")       \
3332           range(0, max_uintx)                                               \
3333                                                                             \
3334   product(bool, SegmentedCodeCache, false,                                  \
3335           "Use a segmented code cache")                                     \
3336                                                                             \
3337   product_pd(uintx, ReservedCodeCacheSize,                                  \
3338           "Reserved code cache size (in bytes) - maximum code cache size")  \
3339           range(0, max_uintx)                                               \
3340                                                                             \
3341   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3342           "Size of code heap with non-profiled methods (in bytes)")         \
3343           range(0, max_uintx)                                               \
3344                                                                             \
3345   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3346           "Size of code heap with profiled methods (in bytes)")             \
3347           range(0, max_uintx)                                               \
3348                                                                             \
3349   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3350           "Size of code heap with non-nmethods (in bytes)")                 \
3351           range(0, max_uintx)                                               \
3352                                                                             \
3353   product_pd(uintx, CodeCacheExpansionSize,                                 \
3354           "Code cache expansion size (in bytes)")                           \
3355           range(0, max_uintx)                                               \
3356                                                                             \
3357   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3358           "Minimum number of segments in a code cache block")               \
3359           range(1, 100)                                                     \
3360                                                                             \
3361   notproduct(bool, ExitOnFullCodeCache, false,                              \
3362           "Exit the VM if we fill the code cache")                          \
3363                                                                             \
3364   product(bool, UseCodeCacheFlushing, true,                                 \
3365           "Remove cold/old nmethods from the code cache")                   \
3366                                                                             \
3367   product(uintx, StartAggressiveSweepingAt, 10,                             \
3368           "Start aggressive sweeping if X[%] of the code cache is free."    \
3369           "Segmented code cache: X[%] of the non-profiled heap."            \
3370           "Non-segmented code cache: X[%] of the total code cache")         \
3371           range(0, 100)                                                     \
3372                                                                             \
3373   /* AOT parameters */                                                      \
3374   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3375           "Use AOT compiled files")                                         \
3376                                                                             \
3377   product(ccstrlist, AOTLibrary, NULL,                                      \
3378           "AOT library")                                                    \
3379                                                                             \
3380   product(bool, PrintAOT, false,                                            \
3381           "Print used AOT klasses and methods")                             \
3382                                                                             \
3383   notproduct(bool, PrintAOTStatistics, false,                               \
3384           "Print AOT statistics")                                           \
3385                                                                             \
3386   diagnostic(bool, UseAOTStrictLoading, false,                              \
3387           "Exit the VM if any of the AOT libraries has invalid config")     \
3388                                                                             \
3389   /* interpreter debugging */                                               \
3390   develop(intx, BinarySwitchThreshold, 5,                                   \
3391           "Minimal number of lookupswitch entries for rewriting to binary " \
3392           "switch")                                                         \
3393                                                                             \
3394   develop(intx, StopInterpreterAt, 0,                                       \
3395           "Stop interpreter execution at specified bytecode number")        \
3396                                                                             \
3397   develop(intx, TraceBytecodesAt, 0,                                        \
3398           "Trace bytecodes starting with specified bytecode number")        \
3399                                                                             \
3400   /* compiler interface */                                                  \
3401   develop(intx, CIStart, 0,                                                 \
3402           "The id of the first compilation to permit")                      \
3403                                                                             \
3404   develop(intx, CIStop, max_jint,                                           \
3405           "The id of the last compilation to permit")                       \
3406                                                                             \
3407   develop(intx, CIStartOSR, 0,                                              \
3408           "The id of the first osr compilation to permit "                  \
3409           "(CICountOSR must be on)")                                        \
3410                                                                             \
3411   develop(intx, CIStopOSR, max_jint,                                        \
3412           "The id of the last osr compilation to permit "                   \
3413           "(CICountOSR must be on)")                                        \
3414                                                                             \
3415   develop(intx, CIBreakAtOSR, -1,                                           \
3416           "The id of osr compilation to break at")                          \
3417                                                                             \
3418   develop(intx, CIBreakAt, -1,                                              \
3419           "The id of compilation to break at")                              \
3420                                                                             \
3421   product(ccstrlist, CompileOnly, "",                                       \
3422           "List of methods (pkg/class.name) to restrict compilation to")    \
3423                                                                             \
3424   product(ccstr, CompileCommandFile, NULL,                                  \
3425           "Read compiler commands from this file [.hotspot_compiler]")      \
3426                                                                             \
3427   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3428           "Read compiler directives from this file")                        \
3429                                                                             \
3430   product(ccstrlist, CompileCommand, "",                                    \
3431           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3432                                                                             \
3433   develop(bool, ReplayCompiles, false,                                      \
3434           "Enable replay of compilations from ReplayDataFile")              \
3435                                                                             \
3436   product(ccstr, ReplayDataFile, NULL,                                      \
3437           "File containing compilation replay information"                  \
3438           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3439                                                                             \
3440    product(ccstr, InlineDataFile, NULL,                                     \
3441           "File containing inlining replay information"                     \
3442           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3443                                                                             \
3444   develop(intx, ReplaySuppressInitializers, 2,                              \
3445           "Control handling of class initialization during replay: "        \
3446           "0 - don't do anything special; "                                 \
3447           "1 - treat all class initializers as empty; "                     \
3448           "2 - treat class initializers for application classes as empty; " \
3449           "3 - allow all class initializers to run during bootstrap but "   \
3450           "    pretend they are empty after starting replay")               \
3451           range(0, 3)                                                       \
3452                                                                             \
3453   develop(bool, ReplayIgnoreInitErrors, false,                              \
3454           "Ignore exceptions thrown during initialization for replay")      \
3455                                                                             \
3456   product(bool, DumpReplayDataOnError, true,                                \
3457           "Record replay data for crashing compiler threads")               \
3458                                                                             \
3459   product(bool, CICompilerCountPerCPU, false,                               \
3460           "1 compiler thread for log(N CPUs)")                              \
3461                                                                             \
3462   develop(intx, CIFireOOMAt,    -1,                                         \
3463           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3464           "(non-negative value throws OOM after this many CI accesses "     \
3465           "in each compile)")                                               \
3466   notproduct(intx, CICrashAt, -1,                                           \
3467           "id of compilation to trigger assert in compiler thread for "     \
3468           "the purpose of testing, e.g. generation of replay data")         \
3469   notproduct(bool, CIObjectFactoryVerify, false,                            \
3470           "enable potentially expensive verification in ciObjectFactory")   \
3471                                                                             \
3472   /* Priorities */                                                          \
3473   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3474                                                                             \
3475   product(intx, ThreadPriorityPolicy, 0,                                    \
3476           "0 : Normal.                                                     "\
3477           "    VM chooses priorities that are appropriate for normal       "\
3478           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3479           "    to normal native priority. Java priorities below "           \
3480           "    NORM_PRIORITY map to lower native priority values. On       "\
3481           "    Windows applications are allowed to use higher native       "\
3482           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3483           "    not use the highest possible native priority,               "\
3484           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3485           "    system threads. On Linux thread priorities are ignored      "\
3486           "    because the OS does not support static priority in          "\
3487           "    SCHED_OTHER scheduling class which is the only choice for   "\
3488           "    non-root, non-realtime applications.                        "\
3489           "1 : Aggressive.                                                 "\
3490           "    Java thread priorities map over to the entire range of      "\
3491           "    native thread priorities. Higher Java thread priorities map "\
3492           "    to higher native thread priorities. This policy should be   "\
3493           "    used with care, as sometimes it can cause performance       "\
3494           "    degradation in the application and/or the entire system. On "\
3495           "    Linux this policy requires root privilege.")                 \
3496           range(0, 1)                                                       \
3497                                                                             \
3498   product(bool, ThreadPriorityVerbose, false,                               \
3499           "Print priority changes")                                         \
3500                                                                             \
3501   product(intx, CompilerThreadPriority, -1,                                 \
3502           "The native priority at which compiler threads should run "       \
3503           "(-1 means no change)")                                           \
3504           range(min_jint, max_jint)                                         \
3505           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3506                                                                             \
3507   product(intx, VMThreadPriority, -1,                                       \
3508           "The native priority at which the VM thread should run "          \
3509           "(-1 means no change)")                                           \
3510           range(-1, 127)                                                    \
3511                                                                             \
3512   product(bool, CompilerThreadHintNoPreempt, true,                          \
3513           "(Solaris only) Give compiler threads an extra quanta")           \
3514                                                                             \
3515   product(bool, VMThreadHintNoPreempt, false,                               \
3516           "(Solaris only) Give VM thread an extra quanta")                  \
3517                                                                             \
3518   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3519           "Map Java priorities to OS priorities")                           \
3520           range(-1, 127)                                                    \
3521                                                                             \
3522   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3523           "Map Java priorities to OS priorities")                           \
3524           range(-1, 127)                                                    \
3525                                                                             \
3526   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3527           "Map Java priorities to OS priorities")                           \
3528           range(-1, 127)                                                    \
3529                                                                             \
3530   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3531           "Map Java priorities to OS priorities")                           \
3532           range(-1, 127)                                                    \
3533                                                                             \
3534   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3535           "Map Java priorities to OS priorities")                           \
3536           range(-1, 127)                                                    \
3537                                                                             \
3538   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3539           "Map Java priorities to OS priorities")                           \
3540           range(-1, 127)                                                    \
3541                                                                             \
3542   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3543           "Map Java priorities to OS priorities")                           \
3544           range(-1, 127)                                                    \
3545                                                                             \
3546   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3547           "Map Java priorities to OS priorities")                           \
3548           range(-1, 127)                                                    \
3549                                                                             \
3550   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552           range(-1, 127)                                                    \
3553                                                                             \
3554   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3555           "Map Java priorities to OS priorities")                           \
3556           range(-1, 127)                                                    \
3557                                                                             \
3558   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3559           "Java thread priority 10 maps to critical scheduling priority")   \
3560                                                                             \
3561   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3562           "Compiler thread(s) run at critical scheduling priority")         \
3563                                                                             \
3564   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3565           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3566                                                                             \
3567   /* compiler debugging */                                                  \
3568   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3569           "First class to consider when using +CompileTheWorld")            \
3570                                                                             \
3571   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3572           "Last class to consider when using +CompileTheWorld")             \
3573                                                                             \
3574   develop(intx, NewCodeParameter,      0,                                   \
3575           "Testing Only: Create a dedicated integer parameter before "      \
3576           "putback")                                                        \
3577                                                                             \
3578   /* new oopmap storage allocation */                                       \
3579   develop(intx, MinOopMapAllocation,     8,                                 \
3580           "Minimum number of OopMap entries in an OopMapSet")               \
3581                                                                             \
3582   /* Background Compilation */                                              \
3583   develop(intx, LongCompileThreshold,     50,                               \
3584           "Used with +TraceLongCompiles")                                   \
3585                                                                             \
3586   /* recompilation */                                                       \
3587   product_pd(intx, CompileThreshold,                                        \
3588           "number of interpreted method invocations before (re-)compiling") \
3589           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3590                                                                             \
3591   product(double, CompileThresholdScaling, 1.0,                             \
3592           "Factor to control when first compilation happens "               \
3593           "(both with and without tiered compilation): "                    \
3594           "values greater than 1.0 delay counter overflow, "                \
3595           "values between 0 and 1.0 rush counter overflow, "                \
3596           "value of 1.0 leaves compilation thresholds unchanged "           \
3597           "value of 0.0 is equivalent to -Xint. "                           \
3598           ""                                                                \
3599           "Flag can be set as per-method option. "                          \
3600           "If a value is specified for a method, compilation thresholds "   \
3601           "for that method are scaled by both the value of the global flag "\
3602           "and the value of the per-method flag.")                          \
3603           range(0.0, DBL_MAX)                                               \
3604                                                                             \
3605   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3606           "Interpreter (tier 0) invocation notification frequency")         \
3607           range(0, 30)                                                      \
3608                                                                             \
3609   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3610           "C1 without MDO (tier 2) invocation notification frequency")      \
3611           range(0, 30)                                                      \
3612                                                                             \
3613   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3614           "C1 with MDO profiling (tier 3) invocation notification "         \
3615           "frequency")                                                      \
3616           range(0, 30)                                                      \
3617                                                                             \
3618   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3619           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3620           range(0, 30)                                                      \
3621                                                                             \
3622   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3623           "Interpreter (tier 0) invocation notification frequency")         \
3624           range(0, 30)                                                      \
3625                                                                             \
3626   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3627           "C1 without MDO (tier 2) invocation notification frequency")      \
3628           range(0, 30)                                                      \
3629                                                                             \
3630   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3631           "C1 with MDO profiling (tier 3) invocation notification "         \
3632           "frequency")                                                      \
3633           range(0, 30)                                                      \
3634                                                                             \
3635   product(intx, Tier2CompileThreshold, 0,                                   \
3636           "threshold at which tier 2 compilation is invoked")               \
3637           range(0, max_jint)                                                \
3638                                                                             \
3639   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3640           "Back edge threshold at which tier 2 compilation is invoked")     \
3641           range(0, max_jint)                                                \
3642                                                                             \
3643   product(intx, Tier3InvocationThreshold, 200,                              \
3644           "Compile if number of method invocations crosses this "           \
3645           "threshold")                                                      \
3646           range(0, max_jint)                                                \
3647                                                                             \
3648   product(intx, Tier3MinInvocationThreshold, 100,                           \
3649           "Minimum invocation to compile at tier 3")                        \
3650           range(0, max_jint)                                                \
3651                                                                             \
3652   product(intx, Tier3CompileThreshold, 2000,                                \
3653           "Threshold at which tier 3 compilation is invoked (invocation "   \
3654           "minimum must be satisfied)")                                     \
3655           range(0, max_jint)                                                \
3656                                                                             \
3657   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3658           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3659           range(0, max_jint)                                                \
3660                                                                             \
3661   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3662           "Compile if number of method invocations crosses this "           \
3663           "threshold if coming from AOT")                                   \
3664           range(0, max_jint)                                                \
3665                                                                             \
3666   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3667           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3668           range(0, max_jint)                                                \
3669                                                                             \
3670   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3671           "Threshold at which tier 3 compilation is invoked (invocation "   \
3672           "minimum must be satisfied) if coming from AOT")                  \
3673           range(0, max_jint)                                                \
3674                                                                             \
3675   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3676           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3677           "if coming from AOT")                                             \
3678           range(0, max_jint)                                                \
3679                                                                             \
3680   product(intx, Tier4InvocationThreshold, 5000,                             \
3681           "Compile if number of method invocations crosses this "           \
3682           "threshold")                                                      \
3683           range(0, max_jint)                                                \
3684                                                                             \
3685   product(intx, Tier4MinInvocationThreshold, 600,                           \
3686           "Minimum invocation to compile at tier 4")                        \
3687           range(0, max_jint)                                                \
3688                                                                             \
3689   product(intx, Tier4CompileThreshold, 15000,                               \
3690           "Threshold at which tier 4 compilation is invoked (invocation "   \
3691           "minimum must be satisfied")                                      \
3692           range(0, max_jint)                                                \
3693                                                                             \
3694   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3695           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3696           range(0, max_jint)                                                \
3697                                                                             \
3698   product(intx, Tier3DelayOn, 5,                                            \
3699           "If C2 queue size grows over this amount per compiler thread "    \
3700           "stop compiling at tier 3 and start compiling at tier 2")         \
3701           range(0, max_jint)                                                \
3702                                                                             \
3703   product(intx, Tier3DelayOff, 2,                                           \
3704           "If C2 queue size is less than this amount per compiler thread "  \
3705           "allow methods compiled at tier 2 transition to tier 3")          \
3706           range(0, max_jint)                                                \
3707                                                                             \
3708   product(intx, Tier3LoadFeedback, 5,                                       \
3709           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3710           "reaches this amount per compiler thread")                        \
3711           range(0, max_jint)                                                \
3712                                                                             \
3713   product(intx, Tier4LoadFeedback, 3,                                       \
3714           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3715           "reaches this amount per compiler thread")                        \
3716           range(0, max_jint)                                                \
3717                                                                             \
3718   product(intx, TieredCompileTaskTimeout, 50,                               \
3719           "Kill compile task if method was not used within "                \
3720           "given timeout in milliseconds")                                  \
3721           range(0, max_intx)                                                \
3722                                                                             \
3723   product(intx, TieredStopAtLevel, 4,                                       \
3724           "Stop at given compilation level")                                \
3725           range(0, 4)                                                       \
3726                                                                             \
3727   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3728           "Start profiling in interpreter if the counters exceed tier 3 "   \
3729           "thresholds by the specified percentage")                         \
3730           range(0, max_jint)                                                \
3731                                                                             \
3732   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3733           "Increase the compile threshold for C1 compilation if the code "  \
3734           "cache is filled by the specified percentage")                    \
3735           range(0, 99)                                                      \
3736                                                                             \
3737   product(intx, TieredRateUpdateMinTime, 1,                                 \
3738           "Minimum rate sampling interval (in milliseconds)")               \
3739           range(0, max_intx)                                                \
3740                                                                             \
3741   product(intx, TieredRateUpdateMaxTime, 25,                                \
3742           "Maximum rate sampling interval (in milliseconds)")               \
3743           range(0, max_intx)                                                \
3744                                                                             \
3745   product_pd(bool, TieredCompilation,                                       \
3746           "Enable tiered compilation")                                      \
3747                                                                             \
3748   product(bool, PrintTieredEvents, false,                                   \
3749           "Print tiered events notifications")                              \
3750                                                                             \
3751   product_pd(intx, OnStackReplacePercentage,                                \
3752           "NON_TIERED number of method invocations/branches (expressed as " \
3753           "% of CompileThreshold) before (re-)compiling OSR code")          \
3754           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3755                                                                             \
3756   product(intx, InterpreterProfilePercentage, 33,                           \
3757           "NON_TIERED number of method invocations/branches (expressed as " \
3758           "% of CompileThreshold) before profiling in the interpreter")     \
3759           range(0, 100)                                                     \
3760                                                                             \
3761   develop(intx, MaxRecompilationSearchLength,    10,                        \
3762           "The maximum number of frames to inspect when searching for "     \
3763           "recompilee")                                                     \
3764                                                                             \
3765   develop(intx, MaxInterpretedSearchLength,     3,                          \
3766           "The maximum number of interpreted frames to skip when searching "\
3767           "for recompilee")                                                 \
3768                                                                             \
3769   develop(intx, DesiredMethodLimit,  8000,                                  \
3770           "The desired maximum method size (in bytecodes) after inlining")  \
3771                                                                             \
3772   develop(intx, HugeMethodLimit,  8000,                                     \
3773           "Don't compile methods larger than this if "                      \
3774           "+DontCompileHugeMethods")                                        \
3775                                                                             \
3776   /* New JDK 1.4 reflection implementation */                               \
3777                                                                             \
3778   develop(intx, FastSuperclassLimit, 8,                                     \
3779           "Depth of hardwired instanceof accelerator array")                \
3780                                                                             \
3781   /* Properties for Java libraries  */                                      \
3782                                                                             \
3783   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3784           "Maximum total size of NIO direct-buffer allocations")            \
3785           range(0, max_jlong)                                               \
3786                                                                             \
3787   /* Flags used for temporary code during development  */                   \
3788                                                                             \
3789   diagnostic(bool, UseNewCode, false,                                       \
3790           "Testing Only: Use the new version while testing")                \
3791                                                                             \
3792   diagnostic(bool, UseNewCode2, false,                                      \
3793           "Testing Only: Use the new version while testing")                \
3794                                                                             \
3795   diagnostic(bool, UseNewCode3, false,                                      \
3796           "Testing Only: Use the new version while testing")                \
3797                                                                             \
3798   /* flags for performance data collection */                               \
3799                                                                             \
3800   product(bool, UsePerfData, true,                                          \
3801           "Flag to disable jvmstat instrumentation for performance testing "\
3802           "and problem isolation purposes")                                 \
3803                                                                             \
3804   product(bool, PerfDataSaveToFile, false,                                  \
3805           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3806                                                                             \
3807   product(ccstr, PerfDataSaveFile, NULL,                                    \
3808           "Save PerfData memory to the specified absolute pathname. "       \
3809           "The string %p in the file name (if present) "                    \
3810           "will be replaced by pid")                                        \
3811                                                                             \
3812   product(intx, PerfDataSamplingInterval, 50,                               \
3813           "Data sampling interval (in milliseconds)")                       \
3814           range(PeriodicTask::min_interval, max_jint)                       \
3815           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3816                                                                             \
3817   product(bool, PerfDisableSharedMem, false,                                \
3818           "Store performance data in standard memory")                      \
3819                                                                             \
3820   product(intx, PerfDataMemorySize, 32*K,                                   \
3821           "Size of performance data memory region. Will be rounded "        \
3822           "up to a multiple of the native os page size.")                   \
3823           range(128, 32*64*K)                                               \
3824                                                                             \
3825   product(intx, PerfMaxStringConstLength, 1024,                             \
3826           "Maximum PerfStringConstant string length before truncation")     \
3827           range(32, 32*K)                                                   \
3828                                                                             \
3829   product(bool, PerfAllowAtExitRegistration, false,                         \
3830           "Allow registration of atexit() methods")                         \
3831                                                                             \
3832   product(bool, PerfBypassFileSystemCheck, false,                           \
3833           "Bypass Win32 file system criteria checks (Windows Only)")        \
3834                                                                             \
3835   product(intx, UnguardOnExecutionViolation, 0,                             \
3836           "Unguard page and retry on no-execute fault (Win32 only) "        \
3837           "0=off, 1=conservative, 2=aggressive")                            \
3838           range(0, 2)                                                       \
3839                                                                             \
3840   /* Serviceability Support */                                              \
3841                                                                             \
3842   product(bool, ManagementServer, false,                                    \
3843           "Create JMX Management Server")                                   \
3844                                                                             \
3845   product(bool, DisableAttachMechanism, false,                              \
3846           "Disable mechanism that allows tools to attach to this VM")       \
3847                                                                             \
3848   product(bool, StartAttachListener, false,                                 \
3849           "Always start Attach Listener at VM startup")                     \
3850                                                                             \
3851   product(bool, EnableDynamicAgentLoading, true,                            \
3852           "Allow tools to load agents with the attach mechanism")           \
3853                                                                             \
3854   manageable(bool, PrintConcurrentLocks, false,                             \
3855           "Print java.util.concurrent locks in thread dump")                \
3856                                                                             \
3857   product(bool, TransmitErrorReport, false,                                 \
3858           "Enable error report transmission on erroneous termination")      \
3859                                                                             \
3860   product(ccstr, ErrorReportServer, NULL,                                   \
3861           "Override built-in error report server address")                  \
3862                                                                             \
3863   /* Shared spaces */                                                       \
3864                                                                             \
3865   product(bool, UseSharedSpaces, true,                                      \
3866           "Use shared spaces for metadata")                                 \
3867                                                                             \
3868   product(bool, VerifySharedSpaces, false,                                  \
3869           "Verify shared spaces (false for default archive, true for "      \
3870           "archive specified by -XX:SharedArchiveFile)")                    \
3871                                                                             \
3872   product(bool, RequireSharedSpaces, false,                                 \
3873           "Require shared spaces for metadata")                             \
3874                                                                             \
3875   product(bool, DumpSharedSpaces, false,                                    \
3876           "Special mode: JVM reads a class list, loads classes, builds "    \
3877           "shared spaces, and dumps the shared spaces to a file to be "     \
3878           "used in future JVM runs")                                        \
3879                                                                             \
3880   product(bool, PrintSharedSpaces, false,                                   \
3881           "Print usage of shared spaces")                                   \
3882                                                                             \
3883   product(bool, PrintSharedArchiveAndExit, false,                           \
3884           "Print shared archive file contents")                             \
3885                                                                             \
3886   product(bool, PrintSharedDictionary, false,                               \
3887           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3888           "dictionary")                                                     \
3889                                                                             \
3890   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3891           "Size of read-write space for metadata (in bytes)")               \
3892           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3893           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3894                                                                             \
3895   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3896           "Size of read-only space for metadata (in bytes)")                \
3897           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3898           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3899                                                                             \
3900   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3901           "Size of the shared miscellaneous data area (in bytes)")          \
3902           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3903           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3904                                                                             \
3905   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3906           "Size of the shared miscellaneous code area (in bytes)")          \
3907           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3908           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3909                                                                             \
3910   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3911           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3912           "Address to allocate shared memory region for class data")        \
3913           range(0, SIZE_MAX)                                                \
3914                                                                             \
3915   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3916           "Average number of symbols per bucket in shared table")           \
3917           range(2, 246)                                                     \
3918                                                                             \
3919   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3920           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3921           "classes. Just exclude them from the shared dictionary.")         \
3922                                                                             \
3923   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3924           "Print generated stub code for method handles")                   \
3925                                                                             \
3926   develop(bool, TraceMethodHandles, false,                                  \
3927           "trace internal method handle operations")                        \
3928                                                                             \
3929   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3930           "perform extra checks when constructing method handles")          \
3931                                                                             \
3932   diagnostic(bool, ShowHiddenFrames, false,                                 \
3933           "show method handle implementation frames (usually hidden)")      \
3934                                                                             \
3935   experimental(bool, TrustFinalNonStaticFields, false,                      \
3936           "trust final non-static declarations for constant folding")       \
3937                                                                             \
3938   diagnostic(bool, FoldStableValues, true,                                  \
3939           "Optimize loads from stable fields (marked w/ @Stable)")          \
3940                                                                             \
3941   develop(bool, TraceInvokeDynamic, false,                                  \
3942           "trace internal invoke dynamic operations")                       \
3943                                                                             \
3944   diagnostic(bool, PauseAtStartup,      false,                              \
3945           "Causes the VM to pause at startup time and wait for the pause "  \
3946           "file to be removed (default: ./vm.paused.<pid>)")                \
3947                                                                             \
3948   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3949           "The file to create and for whose removal to await when pausing " \
3950           "at startup. (default: ./vm.paused.<pid>)")                       \
3951                                                                             \
3952   diagnostic(bool, PauseAtExit, false,                                      \
3953           "Pause and wait for keypress on exit if a debugger is attached")  \
3954                                                                             \
3955   product(bool, ExtendedDTraceProbes,    false,                             \
3956           "Enable performance-impacting dtrace probes")                     \
3957                                                                             \
3958   product(bool, DTraceMethodProbes, false,                                  \
3959           "Enable dtrace probes for method-entry and method-exit")          \
3960                                                                             \
3961   product(bool, DTraceAllocProbes, false,                                   \
3962           "Enable dtrace probes for object allocation")                     \
3963                                                                             \
3964   product(bool, DTraceMonitorProbes, false,                                 \
3965           "Enable dtrace probes for monitor events")                        \
3966                                                                             \
3967   product(bool, RelaxAccessControlCheck, false,                             \
3968           "Relax the access control checks in the verifier")                \
3969                                                                             \
3970   product(uintx, StringTableSize, defaultStringTableSize,                   \
3971           "Number of buckets in the interned String table")                 \
3972           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3973                                                                             \
3974   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3975           "Number of buckets in the JVM internal Symbol table")             \
3976           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3977                                                                             \
3978   product(bool, UseStringDeduplication, false,                              \
3979           "Use string deduplication")                                       \
3980                                                                             \
3981   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3982           "A string must reach this age (or be promoted to an old region) " \
3983           "to be considered for deduplication")                             \
3984           range(1, markOopDesc::max_age)                                    \
3985                                                                             \
3986   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3987           "Force table resize every time the table is scanned")             \
3988                                                                             \
3989   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3990           "Force table rehash every time the table is scanned")             \
3991                                                                             \
3992   diagnostic(bool, WhiteBoxAPI, false,                                      \
3993           "Enable internal testing APIs")                                   \
3994                                                                             \
3995   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3996            "Default survivor space alignment in bytes")                     \
3997            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
3998                                                                             \
3999   product(bool , AllowNonVirtualCalls, false,                               \
4000           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4001                                                                             \
4002   product(ccstr, DumpLoadedClassList, NULL,                                 \
4003           "Dump the names all loaded classes, that could be stored into "   \
4004           "the CDS archive, in the specified file")                         \
4005                                                                             \
4006   product(ccstr, SharedClassListFile, NULL,                                 \
4007           "Override the default CDS class list")                            \
4008                                                                             \
4009   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4010           "Override the default location of the CDS archive file")          \
4011                                                                             \
4012   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4013           "Extra classlist for building the CDS archive file")              \
4014                                                                             \
4015   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4016           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4017           "Allocation less than this value will be allocated "              \
4018           "using malloc. Larger allocations will use mmap.")                \
4019                                                                             \
4020   experimental(bool, AlwaysAtomicAccesses, false,                           \
4021           "Accesses to all variables should always be atomic")              \
4022                                                                             \
4023   product(bool, EnableTracing, false,                                       \
4024           "Enable event-based tracing")                                     \
4025                                                                             \
4026   product(bool, UseLockedTracing, false,                                    \
4027           "Use locked-tracing when doing event-based tracing")              \
4028                                                                             \
4029   diagnostic(bool, UseUnalignedAccesses, false,                             \
4030           "Use unaligned memory accesses in Unsafe")                        \
4031                                                                             \
4032   product_pd(bool, PreserveFramePointer,                                    \
4033              "Use the FP register for holding the frame pointer "           \
4034              "and not as a general purpose register.")                      \
4035                                                                             \
4036   diagnostic(bool, CheckIntrinsics, true,                                   \
4037              "When a class C is loaded, check that "                        \
4038              "(1) all intrinsics defined by the VM for class C are present "\
4039              "in the loaded class file and are marked with the "            \
4040              "@HotSpotIntrinsicCandidate annotation, that "                 \
4041              "(2) there is an intrinsic registered for all loaded methods " \
4042              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4043              "annotation, and that "                                        \
4044              "(3) no orphan methods exist for class C (i.e., methods for "  \
4045              "which the VM declares an intrinsic but that are not declared "\
4046              "in the loaded class C. "                                      \
4047              "Check (3) is available only in debug builds.")                \
4048                                                                             \
4049   diagnostic_pd(intx, InitArrayShortSize,                                   \
4050           "Threshold small size (in bytes) for clearing arrays. "           \
4051           "Anything this size or smaller may get converted to discrete "    \
4052           "scalar stores.")                                                 \
4053           range(0, max_intx)                                                \
4054           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4055                                                                             \
4056   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4057              "Disable backwards compatibility for compile commands.")       \
4058                                                                             \
4059   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4060              "Print compiler directives on installation.")                  \
4061   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4062              "Limit on number of compiler directives.")
4063 
4064 
4065 /*
4066  *  Macros for factoring of globals
4067  */
4068 
4069 // Interface macros
4070 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4071 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4072 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4073 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4074 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4075 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4076 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4077 #ifdef PRODUCT
4078 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4079 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4080 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4081 #else
4082 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4083 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4084 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4085 #endif // PRODUCT
4086 // Special LP64 flags, product only needed for now.
4087 #ifdef _LP64
4088 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4089 #else
4090 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4091 #endif // _LP64
4092 
4093 // Implementation macros
4094 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4095 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4096 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4097 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4098 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4099 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4100 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4101 #ifdef PRODUCT
4102 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4103 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4104 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4105 #else
4106 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4107 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4108 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4109 #endif // PRODUCT
4110 #ifdef _LP64
4111 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4112 #else
4113 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4114 #endif // _LP64
4115 
4116 // Only materialize src code for range checking when required, ignore otherwise
4117 #define IGNORE_RANGE(a, b)
4118 // Only materialize src code for contraint checking when required, ignore otherwise
4119 #define IGNORE_CONSTRAINT(func,type)
4120 
4121 #define IGNORE_WRITEABLE(type)
4122 
4123 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4124               DECLARE_PD_DEVELOPER_FLAG, \
4125               DECLARE_PRODUCT_FLAG, \
4126               DECLARE_PD_PRODUCT_FLAG, \
4127               DECLARE_DIAGNOSTIC_FLAG, \
4128               DECLARE_PD_DIAGNOSTIC_FLAG, \
4129               DECLARE_EXPERIMENTAL_FLAG, \
4130               DECLARE_NOTPRODUCT_FLAG, \
4131               DECLARE_MANAGEABLE_FLAG, \
4132               DECLARE_PRODUCT_RW_FLAG, \
4133               DECLARE_LP64_PRODUCT_FLAG, \
4134               IGNORE_RANGE, \
4135               IGNORE_CONSTRAINT, \
4136               IGNORE_WRITEABLE)
4137 
4138 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4139                  DECLARE_PD_DEVELOPER_FLAG, \
4140                  DECLARE_PRODUCT_FLAG, \
4141                  DECLARE_PD_PRODUCT_FLAG, \
4142                  DECLARE_DIAGNOSTIC_FLAG, \
4143                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4144                  DECLARE_NOTPRODUCT_FLAG, \
4145                  IGNORE_RANGE, \
4146                  IGNORE_CONSTRAINT, \
4147                  IGNORE_WRITEABLE)
4148 
4149 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4150            DECLARE_PRODUCT_FLAG, \
4151            DECLARE_DIAGNOSTIC_FLAG, \
4152            DECLARE_EXPERIMENTAL_FLAG, \
4153            DECLARE_NOTPRODUCT_FLAG, \
4154            IGNORE_RANGE, \
4155            IGNORE_CONSTRAINT, \
4156            IGNORE_WRITEABLE)
4157 
4158 // Extensions
4159 
4160 #include "runtime/globals_ext.hpp"
4161 
4162 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP