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/align.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/macros.hpp"
  31 
  32 #include <float.h> // for DBL_MAX
  33 
  34 // The larger HeapWordSize for 64bit requires larger heaps
  35 // for the same application running in 64bit.  See bug 4967770.
  36 // The minimum alignment to a heap word size is done.  Other
  37 // parts of the memory system may require additional alignment
  38 // and are responsible for those alignments.
  39 #ifdef _LP64
  40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
  41 #else
  42 #define ScaleForWordSize(x) (x)
  43 #endif
  44 
  45 // use this for flags that are true per default in the tiered build
  46 // but false in non-tiered builds, and vice versa
  47 #ifdef TIERED
  48 #define  trueInTiered true
  49 #define falseInTiered false
  50 #else
  51 #define  trueInTiered false
  52 #define falseInTiered true
  53 #endif
  54 
  55 #include CPU_HEADER(globals)
  56 #include OS_HEADER(globals)
  57 #include OS_CPU_HEADER(globals)
  58 #ifdef COMPILER1
  59 #include CPU_HEADER(c1_globals)
  60 #include OS_HEADER(c1_globals)
  61 #endif
  62 #ifdef COMPILER2
  63 #include CPU_HEADER(c2_globals)
  64 #include OS_HEADER(c2_globals)
  65 #endif
  66 #ifdef SHARK
  67 #ifdef ZERO
  68 # include "shark_globals_zero.hpp"
  69 #endif
  70 #endif
  71 
  72 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
  73 define_pd_global(bool, BackgroundCompilation,        false);
  74 define_pd_global(bool, UseTLAB,                      false);
  75 define_pd_global(bool, CICompileOSR,                 false);
  76 define_pd_global(bool, UseTypeProfile,               false);
  77 define_pd_global(bool, UseOnStackReplacement,        false);
  78 define_pd_global(bool, InlineIntrinsics,             false);
  79 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  80 define_pd_global(bool, ProfileInterpreter,           false);
  81 define_pd_global(bool, ProfileTraps,                 false);
  82 define_pd_global(bool, TieredCompilation,            false);
  83 
  84 define_pd_global(intx, CompileThreshold,             0);
  85 
  86 define_pd_global(intx, OnStackReplacePercentage,     0);
  87 define_pd_global(bool, ResizeTLAB,                   false);
  88 define_pd_global(intx, FreqInlineSize,               0);
  89 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  90 define_pd_global(intx, InlineClassNatives,           true);
  91 define_pd_global(intx, InlineUnsafeOps,              true);
  92 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  93 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  94 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
  95 define_pd_global(intx, ProfiledCodeHeapSize,         0);
  96 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
  97 
  98 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  99 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 100 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 101 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 102 define_pd_global(bool, NeverActAsServerClassMachine, true);
 103 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 104 #define CI_COMPILER_COUNT 0
 105 #else
 106 
 107 #if defined(COMPILER2) || INCLUDE_JVMCI
 108 #define CI_COMPILER_COUNT 2
 109 #else
 110 #define CI_COMPILER_COUNT 1
 111 #endif // COMPILER2 || INCLUDE_JVMCI
 112 
 113 #endif // no compilers
 114 
 115 // string type aliases used only in this file
 116 typedef const char* ccstr;
 117 typedef const char* ccstrlist;   // represents string arguments which accumulate
 118 
 119 // function type that will construct default range string
 120 typedef const char* (*RangeStrFunc)(void);
 121 
 122 struct Flag {
 123   enum Flags {
 124     // latest value origin
 125     DEFAULT          = 0,
 126     COMMAND_LINE     = 1,
 127     ENVIRON_VAR      = 2,
 128     CONFIG_FILE      = 3,
 129     MANAGEMENT       = 4,
 130     ERGONOMIC        = 5,
 131     ATTACH_ON_DEMAND = 6,
 132     INTERNAL         = 7,
 133 
 134     LAST_VALUE_ORIGIN = INTERNAL,
 135     VALUE_ORIGIN_BITS = 4,
 136     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 137 
 138     // flag kind
 139     KIND_PRODUCT            = 1 << 4,
 140     KIND_MANAGEABLE         = 1 << 5,
 141     KIND_DIAGNOSTIC         = 1 << 6,
 142     KIND_EXPERIMENTAL       = 1 << 7,
 143     KIND_NOT_PRODUCT        = 1 << 8,
 144     KIND_DEVELOP            = 1 << 9,
 145     KIND_PLATFORM_DEPENDENT = 1 << 10,
 146     KIND_READ_WRITE         = 1 << 11,
 147     KIND_C1                 = 1 << 12,
 148     KIND_C2                 = 1 << 13,
 149     KIND_ARCH               = 1 << 14,
 150     KIND_SHARK              = 1 << 15,
 151     KIND_LP64_PRODUCT       = 1 << 16,
 152     KIND_COMMERCIAL         = 1 << 17,
 153     KIND_JVMCI              = 1 << 18,
 154 
 155     // set this bit if the flag was set on the command line
 156     ORIG_COMMAND_LINE       = 1 << 19,
 157 
 158     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 159   };
 160 
 161   enum Error {
 162     // no error
 163     SUCCESS = 0,
 164     // flag name is missing
 165     MISSING_NAME,
 166     // flag value is missing
 167     MISSING_VALUE,
 168     // error parsing the textual form of the value
 169     WRONG_FORMAT,
 170     // flag is not writable
 171     NON_WRITABLE,
 172     // flag value is outside of its bounds
 173     OUT_OF_BOUNDS,
 174     // flag value violates its constraint
 175     VIOLATES_CONSTRAINT,
 176     // there is no flag with the given name
 177     INVALID_FLAG,
 178     // the flag can only be set only on command line during invocation of the VM
 179     COMMAND_LINE_ONLY,
 180     // the flag may only be set once
 181     SET_ONLY_ONCE,
 182     // the flag is not writable in this combination of product/debug build
 183     CONSTANT,
 184     // other, unspecified error related to setting the flag
 185     ERR_OTHER
 186   };
 187 
 188   enum MsgType {
 189     NONE = 0,
 190     DIAGNOSTIC_FLAG_BUT_LOCKED,
 191     EXPERIMENTAL_FLAG_BUT_LOCKED,
 192     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 193     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 194   };
 195 
 196   const char* _type;
 197   const char* _name;
 198   void* _addr;
 199   NOT_PRODUCT(const char* _doc;)
 200   Flags _flags;
 201   size_t _name_len;
 202 
 203   // points to all Flags static array
 204   static Flag* flags;
 205 
 206   // number of flags
 207   static size_t numFlags;
 208 
 209   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 210   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 211   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 212 
 213   static const char* get_int_default_range_str();
 214   static const char* get_uint_default_range_str();
 215   static const char* get_intx_default_range_str();
 216   static const char* get_uintx_default_range_str();
 217   static const char* get_uint64_t_default_range_str();
 218   static const char* get_size_t_default_range_str();
 219   static const char* get_double_default_range_str();
 220 
 221   Flag::Error check_writable(bool changed);
 222 
 223   bool is_bool() const;
 224   bool get_bool() const;
 225   Flag::Error set_bool(bool value);
 226 
 227   bool is_int() const;
 228   int get_int() const;
 229   Flag::Error set_int(int value);
 230 
 231   bool is_uint() const;
 232   uint get_uint() const;
 233   Flag::Error set_uint(uint value);
 234 
 235   bool is_intx() const;
 236   intx get_intx() const;
 237   Flag::Error set_intx(intx value);
 238 
 239   bool is_uintx() const;
 240   uintx get_uintx() const;
 241   Flag::Error set_uintx(uintx value);
 242 
 243   bool is_uint64_t() const;
 244   uint64_t get_uint64_t() const;
 245   Flag::Error set_uint64_t(uint64_t value);
 246 
 247   bool is_size_t() const;
 248   size_t get_size_t() const;
 249   Flag::Error set_size_t(size_t value);
 250 
 251   bool is_double() const;
 252   double get_double() const;
 253   Flag::Error set_double(double value);
 254 
 255   bool is_ccstr() const;
 256   bool ccstr_accumulates() const;
 257   ccstr get_ccstr() const;
 258   Flag::Error set_ccstr(ccstr value);
 259 
 260   Flags get_origin();
 261   void set_origin(Flags origin);
 262 
 263   size_t get_name_length();
 264 
 265   bool is_default();
 266   bool is_ergonomic();
 267   bool is_command_line();
 268   void set_command_line();
 269 
 270   bool is_product() const;
 271   bool is_manageable() const;
 272   bool is_diagnostic() const;
 273   bool is_experimental() const;
 274   bool is_notproduct() const;
 275   bool is_develop() const;
 276   bool is_read_write() const;
 277   bool is_commercial() const;
 278 
 279   bool is_constant_in_binary() const;
 280 
 281   bool is_unlocker() const;
 282   bool is_unlocked() const;
 283   bool is_writeable() const;
 284   bool is_external() const;
 285 
 286   bool is_unlocker_ext() const;
 287   bool is_unlocked_ext() const;
 288   bool is_writeable_ext() const;
 289   bool is_external_ext() const;
 290 
 291   void clear_diagnostic();
 292 
 293   Flag::MsgType get_locked_message(char*, int) const;
 294   void get_locked_message_ext(char*, int) const;
 295 
 296   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 297   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 298   void print_kind_and_origin(outputStream* st);
 299   void print_as_flag(outputStream* st);
 300 
 301   static const char* flag_error_str(Flag::Error error);
 302 };
 303 
 304 // debug flags control various aspects of the VM and are global accessible
 305 
 306 // use FlagSetting to temporarily change some debug flag
 307 // e.g. FlagSetting fs(DebugThisAndThat, true);
 308 // restored to previous value upon leaving scope
 309 class FlagSetting {
 310   bool val;
 311   bool* flag;
 312  public:
 313   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 314   ~FlagSetting()                       { *flag = val; }
 315 };
 316 
 317 
 318 class CounterSetting {
 319   intx* counter;
 320  public:
 321   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 322   ~CounterSetting()         { (*counter)--; }
 323 };
 324 
 325 class IntFlagSetting {
 326   int val;
 327   int* flag;
 328  public:
 329   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 330   ~IntFlagSetting()                     { *flag = val; }
 331 };
 332 
 333 class UIntFlagSetting {
 334   uint val;
 335   uint* flag;
 336  public:
 337   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 338   ~UIntFlagSetting()                       { *flag = val; }
 339 };
 340 
 341 class UIntXFlagSetting {
 342   uintx val;
 343   uintx* flag;
 344  public:
 345   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 346   ~UIntXFlagSetting()                         { *flag = val; }
 347 };
 348 
 349 class DoubleFlagSetting {
 350   double val;
 351   double* flag;
 352  public:
 353   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 354   ~DoubleFlagSetting()                           { *flag = val; }
 355 };
 356 
 357 class SizeTFlagSetting {
 358   size_t val;
 359   size_t* flag;
 360  public:
 361   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 362   ~SizeTFlagSetting()                           { *flag = val; }
 363 };
 364 
 365 // Helper class for temporarily saving the value of a flag during a scope.
 366 template <size_t SIZE>
 367 class FlagGuard {
 368   unsigned char _value[SIZE];
 369   void* const _addr;
 370 
 371   // Hide operator new, this class should only be allocated on the stack.
 372   // NOTE: Cannot include memory/allocation.hpp here due to circular
 373   //       dependencies.
 374   void* operator new(size_t size) throw();
 375   void* operator new [](size_t size) throw();
 376 
 377  public:
 378   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 379     memcpy(_value, _addr, SIZE);
 380   }
 381 
 382   ~FlagGuard() {
 383     memcpy(_addr, _value, SIZE);
 384   }
 385 };
 386 
 387 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 388 
 389 class CommandLineFlags {
 390 public:
 391   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 392   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); }
 393   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 394   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 395   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 396 
 397   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 398   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); }
 399   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 400   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 401   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 402 
 403   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 404   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); }
 405   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 406   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 407   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 408 
 409   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 410   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); }
 411   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 412   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 413   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 414 
 415   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 416   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); }
 417   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 418   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 419   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 420 
 421   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 422   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); }
 423   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 424   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 425   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 426 
 427   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 428   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); }
 429   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 430   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 431   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 432 
 433   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 434   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); }
 435   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 436   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 437   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 438 
 439   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 440   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); }
 441   // Contract:  Flag will make private copy of the incoming value.
 442   // Outgoing value is always malloc-ed, and caller MUST call free.
 443   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 444   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 445 
 446   // Returns false if name is not a command line flag.
 447   static bool wasSetOnCmdline(const char* name, bool* value);
 448   static void printSetFlags(outputStream* out);
 449 
 450   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 451   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 452 
 453   static void verify() PRODUCT_RETURN;
 454 };
 455 
 456 // use this for flags that are true by default in the debug version but
 457 // false in the optimized version, and vice versa
 458 #ifdef ASSERT
 459 #define trueInDebug  true
 460 #define falseInDebug false
 461 #else
 462 #define trueInDebug  false
 463 #define falseInDebug true
 464 #endif
 465 
 466 // use this for flags that are true per default in the product build
 467 // but false in development builds, and vice versa
 468 #ifdef PRODUCT
 469 #define trueInProduct  true
 470 #define falseInProduct false
 471 #else
 472 #define trueInProduct  false
 473 #define falseInProduct true
 474 #endif
 475 
 476 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 477 // product flags are always settable / visible
 478 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 479 
 480 // A flag must be declared with one of the following types:
 481 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 482 // The type "ccstr" is an alias for "const char*" and is used
 483 // only in this file, because the macrology requires single-token type names.
 484 
 485 // Note: Diagnostic options not meant for VM tuning or for product modes.
 486 // They are to be used for VM quality assurance or field diagnosis
 487 // of VM bugs.  They are hidden so that users will not be encouraged to
 488 // try them as if they were VM ordinary execution options.  However, they
 489 // are available in the product version of the VM.  Under instruction
 490 // from support engineers, VM customers can turn them on to collect
 491 // diagnostic information about VM problems.  To use a VM diagnostic
 492 // option, you must first specify +UnlockDiagnosticVMOptions.
 493 // (This master switch also affects the behavior of -Xprintflags.)
 494 //
 495 // experimental flags are in support of features that are not
 496 //    part of the officially supported product, but are available
 497 //    for experimenting with. They could, for example, be performance
 498 //    features that may not have undergone full or rigorous QA, but which may
 499 //    help performance in some cases and released for experimentation
 500 //    by the community of users and developers. This flag also allows one to
 501 //    be able to build a fully supported product that nonetheless also
 502 //    ships with some unsupported, lightly tested, experimental features.
 503 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 504 //    UnlockExperimentalVMOptions flag, which allows the control and
 505 //    modification of the experimental flags.
 506 //
 507 // Nota bene: neither diagnostic nor experimental options should be used casually,
 508 //    and they are not supported on production loads, except under explicit
 509 //    direction from support engineers.
 510 //
 511 // manageable flags are writeable external product flags.
 512 //    They are dynamically writeable through the JDK management interface
 513 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 514 //    These flags are external exported interface (see CCC).  The list of
 515 //    manageable flags can be queried programmatically through the management
 516 //    interface.
 517 //
 518 //    A flag can be made as "manageable" only if
 519 //    - the flag is defined in a CCC as an external exported interface.
 520 //    - the VM implementation supports dynamic setting of the flag.
 521 //      This implies that the VM must *always* query the flag variable
 522 //      and not reuse state related to the flag state at any given time.
 523 //    - you want the flag to be queried programmatically by the customers.
 524 //
 525 // product_rw flags are writeable internal product flags.
 526 //    They are like "manageable" flags but for internal/private use.
 527 //    The list of product_rw flags are internal/private flags which
 528 //    may be changed/removed in a future release.  It can be set
 529 //    through the management interface to get/set value
 530 //    when the name of flag is supplied.
 531 //
 532 //    A flag can be made as "product_rw" only if
 533 //    - the VM implementation supports dynamic setting of the flag.
 534 //      This implies that the VM must *always* query the flag variable
 535 //      and not reuse state related to the flag state at any given time.
 536 //
 537 // Note that when there is a need to support develop flags to be writeable,
 538 // it can be done in the same way as product_rw.
 539 //
 540 // range is a macro that will expand to min and max arguments for range
 541 //    checking code if provided - see commandLineFlagRangeList.hpp
 542 //
 543 // constraint is a macro that will expand to custom function call
 544 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 545 //
 546 // writeable is a macro that controls if and how the value can change during the runtime
 547 //
 548 // writeable(Always) is optional and allows the flag to have its value changed
 549 //    without any limitations at any time
 550 //
 551 // writeable(Once) flag value's can be only set once during the lifetime of VM
 552 //
 553 // writeable(CommandLineOnly) flag value's can be only set from command line
 554 //    (multiple times allowed)
 555 //
 556 
 557 
 558 #define RUNTIME_FLAGS(develop, \
 559                       develop_pd, \
 560                       product, \
 561                       product_pd, \
 562                       diagnostic, \
 563                       diagnostic_pd, \
 564                       experimental, \
 565                       notproduct, \
 566                       manageable, \
 567                       product_rw, \
 568                       lp64_product, \
 569                       range, \
 570                       constraint, \
 571                       writeable) \
 572                                                                             \
 573   lp64_product(bool, UseCompressedOops, false,                              \
 574           "Use 32-bit object references in 64-bit VM. "                     \
 575           "lp64_product means flag is always constant in 32 bit VM")        \
 576                                                                             \
 577   lp64_product(bool, UseCompressedClassPointers, false,                     \
 578           "Use 32-bit class pointers in 64-bit VM. "                        \
 579           "lp64_product means flag is always constant in 32 bit VM")        \
 580                                                                             \
 581   notproduct(bool, CheckCompressedOops, true,                               \
 582           "Generate checks in encoding/decoding code in debug VM")          \
 583                                                                             \
 584   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 585           "Heap allocation steps through preferred address regions to find" \
 586           " where it can allocate the heap. Number of steps to take per "   \
 587           "region.")                                                        \
 588           range(1, max_uintx)                                               \
 589                                                                             \
 590   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 591           "Default object alignment in bytes, 8 is minimum")                \
 592           range(8, 256)                                                     \
 593           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 594                                                                             \
 595   product(bool, AssumeMP, false,                                            \
 596           "Instruct the VM to assume multiple processors are available")    \
 597                                                                             \
 598   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 599   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 600   /* been re-added (see 6401008)                                         */ \
 601   product_pd(bool, UseMembar,                                               \
 602           "(Unstable) Issues membars on thread state transitions")          \
 603                                                                             \
 604   develop(bool, CleanChunkPoolAsync, true,                                  \
 605           "Clean the chunk pool asynchronously")                            \
 606                                                                             \
 607   experimental(bool, AlwaysSafeConstructors, false,                         \
 608           "Force safe construction, as if all fields are final.")           \
 609                                                                             \
 610   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 611           "Enable normal processing of flags relating to field diagnostics")\
 612                                                                             \
 613   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 614           "Enable normal processing of flags relating to experimental "     \
 615           "features")                                                       \
 616                                                                             \
 617   product(bool, JavaMonitorsInStackTrace, true,                             \
 618           "Print information about Java monitor locks when the stacks are"  \
 619           "dumped")                                                         \
 620                                                                             \
 621   product_pd(bool, UseLargePages,                                           \
 622           "Use large page memory")                                          \
 623                                                                             \
 624   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 625           "Allocate large pages individually for better affinity")          \
 626                                                                             \
 627   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 628           "Fail large pages individual allocation")                         \
 629                                                                             \
 630   product(bool, UseLargePagesInMetaspace, false,                            \
 631           "Use large page memory in metaspace. "                            \
 632           "Only used if UseLargePages is enabled.")                         \
 633                                                                             \
 634   product(bool, UseNUMA, false,                                             \
 635           "Use NUMA if available")                                          \
 636                                                                             \
 637   product(bool, UseNUMAInterleaving, false,                                 \
 638           "Interleave memory across NUMA nodes if available")               \
 639                                                                             \
 640   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 641           "Granularity to use for NUMA interleaving on Windows OS")         \
 642           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 643                                                                             \
 644   product(bool, ForceNUMA, false,                                           \
 645           "Force NUMA optimizations on single-node/UMA systems")            \
 646                                                                             \
 647   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 648           "Percentage (0-100) used to weight the current sample when "      \
 649           "computing exponentially decaying average for "                   \
 650           "AdaptiveNUMAChunkSizing")                                        \
 651           range(0, 100)                                                     \
 652                                                                             \
 653   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 654           "Do not reallocate more than this amount per collection")         \
 655           range(0, max_uintx)                                               \
 656                                                                             \
 657   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 658           "Enable adaptive chunk sizing for NUMA")                          \
 659                                                                             \
 660   product(bool, NUMAStats, false,                                           \
 661           "Print NUMA stats in detailed heap information")                  \
 662                                                                             \
 663   product(uintx, NUMAPageScanRate, 256,                                     \
 664           "Maximum number of pages to include in the page scan procedure")  \
 665           range(0, max_uintx)                                               \
 666                                                                             \
 667   product_pd(bool, NeedsDeoptSuspend,                                       \
 668           "True for register window machines (sparc/ia64)")                 \
 669                                                                             \
 670   product(intx, UseSSE, 99,                                                 \
 671           "Highest supported SSE instructions set on x86/x64")              \
 672           range(0, 99)                                                      \
 673                                                                             \
 674   product(bool, UseAES, false,                                              \
 675           "Control whether AES instructions are used when available")       \
 676                                                                             \
 677   product(bool, UseFMA, false,                                              \
 678           "Control whether FMA instructions are used when available")       \
 679                                                                             \
 680   product(bool, UseSHA, false,                                              \
 681           "Control whether SHA instructions are used when available")       \
 682                                                                             \
 683   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 684           "Use intrinsics for GHASH versions of crypto")                    \
 685                                                                             \
 686   product(size_t, LargePageSizeInBytes, 0,                                  \
 687           "Large page size (0 to let VM choose the page size)")             \
 688           range(0, max_uintx)                                               \
 689                                                                             \
 690   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 691           "Use large pages if maximum heap is at least this big")           \
 692           range(0, max_uintx)                                               \
 693                                                                             \
 694   product(bool, ForceTimeHighResolution, false,                             \
 695           "Using high time resolution (for Win32 only)")                    \
 696                                                                             \
 697   develop(bool, TracePcPatching, false,                                     \
 698           "Trace usage of frame::patch_pc")                                 \
 699                                                                             \
 700   develop(bool, TraceRelocator, false,                                      \
 701           "Trace the bytecode relocator")                                   \
 702                                                                             \
 703   develop(bool, TraceLongCompiles, false,                                   \
 704           "Print out every time compilation is longer than "                \
 705           "a given threshold")                                              \
 706                                                                             \
 707   develop(bool, SafepointALot, false,                                       \
 708           "Generate a lot of safepoints. This works with "                  \
 709           "GuaranteedSafepointInterval")                                    \
 710                                                                             \
 711   product_pd(bool, BackgroundCompilation,                                   \
 712           "A thread requesting compilation is not blocked during "          \
 713           "compilation")                                                    \
 714                                                                             \
 715   product(bool, PrintVMQWaitTime, false,                                    \
 716           "Print out the waiting time in VM operation queue")               \
 717                                                                             \
 718   develop(bool, TraceOopMapGeneration, false,                               \
 719           "Show OopMapGeneration")                                          \
 720                                                                             \
 721   product(bool, MethodFlushing, true,                                       \
 722           "Reclamation of zombie and not-entrant methods")                  \
 723                                                                             \
 724   develop(bool, VerifyStack, false,                                         \
 725           "Verify stack of each thread when it is entering a runtime call") \
 726                                                                             \
 727   diagnostic(bool, ForceUnreachable, false,                                 \
 728           "Make all non code cache addresses to be unreachable by "         \
 729           "forcing use of 64bit literal fixups")                            \
 730                                                                             \
 731   notproduct(bool, StressDerivedPointers, false,                            \
 732           "Force scavenge when a derived pointer is detected on stack "     \
 733           "after rtm call")                                                 \
 734                                                                             \
 735   develop(bool, TraceDerivedPointers, false,                                \
 736           "Trace traversal of derived pointers on stack")                   \
 737                                                                             \
 738   notproduct(bool, TraceCodeBlobStacks, false,                              \
 739           "Trace stack-walk of codeblobs")                                  \
 740                                                                             \
 741   product(bool, PrintJNIResolving, false,                                   \
 742           "Used to implement -v:jni")                                       \
 743                                                                             \
 744   notproduct(bool, PrintRewrites, false,                                    \
 745           "Print methods that are being rewritten")                         \
 746                                                                             \
 747   product(bool, UseInlineCaches, true,                                      \
 748           "Use Inline Caches for virtual calls ")                           \
 749                                                                             \
 750   diagnostic(bool, InlineArrayCopy, true,                                   \
 751           "Inline arraycopy native that is known to be part of "            \
 752           "base library DLL")                                               \
 753                                                                             \
 754   diagnostic(bool, InlineObjectHash, true,                                  \
 755           "Inline Object::hashCode() native that is known to be part "      \
 756           "of base library DLL")                                            \
 757                                                                             \
 758   diagnostic(bool, InlineNatives, true,                                     \
 759           "Inline natives that are known to be part of base library DLL")   \
 760                                                                             \
 761   diagnostic(bool, InlineMathNatives, true,                                 \
 762           "Inline SinD, CosD, etc.")                                        \
 763                                                                             \
 764   diagnostic(bool, InlineClassNatives, true,                                \
 765           "Inline Class.isInstance, etc")                                   \
 766                                                                             \
 767   diagnostic(bool, InlineThreadNatives, true,                               \
 768           "Inline Thread.currentThread, etc")                               \
 769                                                                             \
 770   diagnostic(bool, InlineUnsafeOps, true,                                   \
 771           "Inline memory ops (native methods) from Unsafe")                 \
 772                                                                             \
 773   product(bool, CriticalJNINatives, true,                                   \
 774           "Check for critical JNI entry points")                            \
 775                                                                             \
 776   notproduct(bool, StressCriticalJNINatives, false,                         \
 777           "Exercise register saving code in critical natives")              \
 778                                                                             \
 779   diagnostic(bool, UseAESIntrinsics, false,                                 \
 780           "Use intrinsics for AES versions of crypto")                      \
 781                                                                             \
 782   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 783           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 784                                                                             \
 785   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 786           "Use intrinsics for SHA-1 crypto hash function. "                 \
 787           "Requires that UseSHA is enabled.")                               \
 788                                                                             \
 789   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 790           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 791           "Requires that UseSHA is enabled.")                               \
 792                                                                             \
 793   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 794           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 795           "Requires that UseSHA is enabled.")                               \
 796                                                                             \
 797   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 798           "use intrinsics for java.util.zip.CRC32")                         \
 799                                                                             \
 800   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 801           "use intrinsics for java.util.zip.CRC32C")                        \
 802                                                                             \
 803   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 804           "use intrinsics for java.util.zip.Adler32")                       \
 805                                                                             \
 806   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 807           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 808                                                                             \
 809   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 810          "do not expand intrinsics whose (internal) names appear here")     \
 811                                                                             \
 812   develop(bool, TraceCallFixup, false,                                      \
 813           "Trace all call fixups")                                          \
 814                                                                             \
 815   develop(bool, DeoptimizeALot, false,                                      \
 816           "Deoptimize at every exit from the runtime system")               \
 817                                                                             \
 818   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 819           "A comma separated list of bcis to deoptimize at")                \
 820                                                                             \
 821   product(bool, DeoptimizeRandom, false,                                    \
 822           "Deoptimize random frames on random exit from the runtime system")\
 823                                                                             \
 824   notproduct(bool, ZombieALot, false,                                       \
 825           "Create zombies (non-entrant) at exit from the runtime system")   \
 826                                                                             \
 827   product(bool, UnlinkSymbolsALot, false,                                   \
 828           "Unlink unreferenced symbols from the symbol table at safepoints")\
 829                                                                             \
 830   notproduct(bool, WalkStackALot, false,                                    \
 831           "Trace stack (no print) at every exit from the runtime system")   \
 832                                                                             \
 833   product(bool, Debugging, false,                                           \
 834           "Set when executing debug methods in debug.cpp "                  \
 835           "(to prevent triggering assertions)")                             \
 836                                                                             \
 837   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 838           "Enable strict checks that safepoints cannot happen for threads " \
 839           "that use NoSafepointVerifier")                                   \
 840                                                                             \
 841   notproduct(bool, VerifyLastFrame, false,                                  \
 842           "Verify oops on last frame on entry to VM")                       \
 843                                                                             \
 844   product(bool, FailOverToOldVerifier, true,                                \
 845           "Fail over to old verifier when split verifier fails")            \
 846                                                                             \
 847   develop(bool, ShowSafepointMsgs, false,                                   \
 848           "Show message about safepoint synchronization")                   \
 849                                                                             \
 850   product(bool, SafepointTimeout, false,                                    \
 851           "Time out and warn or fail after SafepointTimeoutDelay "          \
 852           "milliseconds if failed to reach safepoint")                      \
 853                                                                             \
 854   develop(bool, DieOnSafepointTimeout, false,                               \
 855           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 856                                                                             \
 857   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 858   /* typically, at most a few retries are needed                    */      \
 859   product(intx, SuspendRetryCount, 50,                                      \
 860           "Maximum retry count for an external suspend request")            \
 861           range(0, max_intx)                                                \
 862                                                                             \
 863   product(intx, SuspendRetryDelay, 5,                                       \
 864           "Milliseconds to delay per retry (* current_retry_count)")        \
 865           range(0, max_intx)                                                \
 866                                                                             \
 867   product(bool, AssertOnSuspendWaitFailure, false,                          \
 868           "Assert/Guarantee on external suspend wait failure")              \
 869                                                                             \
 870   product(bool, TraceSuspendWaitFailures, false,                            \
 871           "Trace external suspend wait failures")                           \
 872                                                                             \
 873   product(bool, MaxFDLimit, true,                                           \
 874           "Bump the number of file descriptors to maximum in Solaris")      \
 875                                                                             \
 876   diagnostic(bool, LogEvents, true,                                         \
 877           "Enable the various ring buffer event logs")                      \
 878                                                                             \
 879   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 880           "Number of ring buffer event logs")                               \
 881           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 882                                                                             \
 883   product(bool, BytecodeVerificationRemote, true,                           \
 884           "Enable the Java bytecode verifier for remote classes")           \
 885                                                                             \
 886   product(bool, BytecodeVerificationLocal, false,                           \
 887           "Enable the Java bytecode verifier for local classes")            \
 888                                                                             \
 889   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 890           "Force exceptions on FP stack under/overflow")                    \
 891                                                                             \
 892   develop(bool, VerifyStackAtCalls, false,                                  \
 893           "Verify that the stack pointer is unchanged after calls")         \
 894                                                                             \
 895   develop(bool, TraceJavaAssertions, false,                                 \
 896           "Trace java language assertions")                                 \
 897                                                                             \
 898   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 899           "Temporary - see javaClasses.cpp")                                \
 900                                                                             \
 901   notproduct(bool, PrintMallocFree, false,                                  \
 902           "Trace calls to C heap malloc/free allocation")                   \
 903                                                                             \
 904   notproduct(bool, VerifyCodeCache, false,                                  \
 905           "Verify code cache on memory allocation/deallocation")            \
 906                                                                             \
 907   develop(bool, UseMallocOnly, false,                                       \
 908           "Use only malloc/free for allocation (no resource area/arena)")   \
 909                                                                             \
 910   develop(bool, PrintMalloc, false,                                         \
 911           "Print all malloc/free calls")                                    \
 912                                                                             \
 913   develop(bool, PrintMallocStatistics, false,                               \
 914           "Print malloc/free statistics")                                   \
 915                                                                             \
 916   develop(bool, ZapResourceArea, trueInDebug,                               \
 917           "Zap freed resource/arena space with 0xABABABAB")                 \
 918                                                                             \
 919   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 920           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 921                                                                             \
 922   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 923           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 924                                                                             \
 925   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 926           "Zap allocated/freed stack segments with 0xFADFADED")             \
 927                                                                             \
 928   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 929           "Zap unused heap space with 0xBAADBABE")                          \
 930                                                                             \
 931   develop(bool, CheckZapUnusedHeapArea, false,                              \
 932           "Check zapping of unused heap space")                             \
 933                                                                             \
 934   develop(bool, ZapFillerObjects, trueInDebug,                              \
 935           "Zap filler objects with 0xDEAFBABE")                             \
 936                                                                             \
 937   develop(bool, PrintVMMessages, true,                                      \
 938           "Print VM messages on console")                                   \
 939                                                                             \
 940   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 941           "If > 0, provokes an error after VM initialization; the value "   \
 942           "determines which error to provoke. See test_error_handler() "    \
 943           "in vmError.cpp.")                                                \
 944                                                                             \
 945   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 946           "If > 0, provokes an error inside VM error handler (a secondary " \
 947           "crash). see test_error_handler() in vmError.cpp")                \
 948                                                                             \
 949   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 950           "If true, tests SafeFetch inside error handler.")                 \
 951                                                                             \
 952   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 953           "If true, simulates an unresponsive error handler.")              \
 954                                                                             \
 955   develop(bool, Verbose, false,                                             \
 956           "Print additional debugging information from other modes")        \
 957                                                                             \
 958   develop(bool, PrintMiscellaneous, false,                                  \
 959           "Print uncategorized debugging information (requires +Verbose)")  \
 960                                                                             \
 961   develop(bool, WizardMode, false,                                          \
 962           "Print much more debugging information")                          \
 963                                                                             \
 964   product(bool, ShowMessageBoxOnError, false,                               \
 965           "Keep process alive on VM fatal error")                           \
 966                                                                             \
 967   product(bool, CreateCoredumpOnCrash, true,                                \
 968           "Create core/mini dump on VM fatal error")                        \
 969                                                                             \
 970   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 971           "Timeout, in seconds, to limit the time spent on writing an "     \
 972           "error log in case of a crash.")                                  \
 973           range(0, (uint64_t)max_jlong/1000)                                \
 974                                                                             \
 975   product_pd(bool, UseOSErrorReporting,                                     \
 976           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 977                                                                             \
 978   product(bool, SuppressFatalErrorMessage, false,                           \
 979           "Report NO fatal error message (avoid deadlock)")                 \
 980                                                                             \
 981   product(ccstrlist, OnError, "",                                           \
 982           "Run user-defined commands on fatal error; see VMError.cpp "      \
 983           "for examples")                                                   \
 984                                                                             \
 985   product(ccstrlist, OnOutOfMemoryError, "",                                \
 986           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 987                                                                             \
 988   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 989           "Dump heap to file before any major stop-the-world GC")           \
 990                                                                             \
 991   manageable(bool, HeapDumpAfterFullGC, false,                              \
 992           "Dump heap to file after any major stop-the-world GC")            \
 993                                                                             \
 994   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 995           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 996                                                                             \
 997   manageable(ccstr, HeapDumpPath, NULL,                                     \
 998           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 999           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1000           "in the working directory)")                                      \
1001                                                                             \
1002   develop(bool, BreakAtWarning, false,                                      \
1003           "Execute breakpoint upon encountering VM warning")                \
1004                                                                             \
1005   develop(bool, UseFakeTimers, false,                                       \
1006           "Tell whether the VM should use system time or a fake timer")     \
1007                                                                             \
1008   product(ccstr, NativeMemoryTracking, "off",                               \
1009           "Native memory tracking options")                                 \
1010                                                                             \
1011   diagnostic(bool, PrintNMTStatistics, false,                               \
1012           "Print native memory tracking summary data if it is on")          \
1013                                                                             \
1014   diagnostic(bool, LogCompilation, false,                                   \
1015           "Log compilation activity in detail to LogFile")                  \
1016                                                                             \
1017   product(bool, PrintCompilation, false,                                    \
1018           "Print compilations")                                             \
1019                                                                             \
1020   diagnostic(bool, TraceNMethodInstalls, false,                             \
1021           "Trace nmethod installation")                                     \
1022                                                                             \
1023   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1024           "0: do not allow scavengable oops in the code cache; "            \
1025           "1: allow scavenging from the code cache; "                       \
1026           "2: emit as many constants as the compiler can see")              \
1027           range(0, 2)                                                       \
1028                                                                             \
1029   product(bool, AlwaysRestoreFPU, false,                                    \
1030           "Restore the FPU control word after every JNI call (expensive)")  \
1031                                                                             \
1032   diagnostic(bool, PrintCompilation2, false,                                \
1033           "Print additional statistics per compilation")                    \
1034                                                                             \
1035   diagnostic(bool, PrintAdapterHandlers, false,                             \
1036           "Print code generated for i2c/c2i adapters")                      \
1037                                                                             \
1038   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1039           "Verify that i2c/c2i adapters are called properly")               \
1040                                                                             \
1041   develop(bool, VerifyAdapterSharing, false,                                \
1042           "Verify that the code for shared adapters is the equivalent")     \
1043                                                                             \
1044   diagnostic(bool, PrintAssembly, false,                                    \
1045           "Print assembly code (using external disassembler.so)")           \
1046                                                                             \
1047   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1048           "Print options string passed to disassembler.so")                 \
1049                                                                             \
1050   notproduct(bool, PrintNMethodStatistics, false,                           \
1051           "Print a summary statistic for the generated nmethods")           \
1052                                                                             \
1053   diagnostic(bool, PrintNMethods, false,                                    \
1054           "Print assembly code for nmethods when generated")                \
1055                                                                             \
1056   diagnostic(bool, PrintNativeNMethods, false,                              \
1057           "Print assembly code for native nmethods when generated")         \
1058                                                                             \
1059   develop(bool, PrintDebugInfo, false,                                      \
1060           "Print debug information for all nmethods when generated")        \
1061                                                                             \
1062   develop(bool, PrintRelocations, false,                                    \
1063           "Print relocation information for all nmethods when generated")   \
1064                                                                             \
1065   develop(bool, PrintDependencies, false,                                   \
1066           "Print dependency information for all nmethods when generated")   \
1067                                                                             \
1068   develop(bool, PrintExceptionHandlers, false,                              \
1069           "Print exception handler tables for all nmethods when generated") \
1070                                                                             \
1071   develop(bool, StressCompiledExceptionHandlers, false,                     \
1072           "Exercise compiled exception handlers")                           \
1073                                                                             \
1074   develop(bool, InterceptOSException, false,                                \
1075           "Start debugger when an implicit OS (e.g. NULL) "                 \
1076           "exception happens")                                              \
1077                                                                             \
1078   product(bool, PrintCodeCache, false,                                      \
1079           "Print the code cache memory usage when exiting")                 \
1080                                                                             \
1081   develop(bool, PrintCodeCache2, false,                                     \
1082           "Print detailed usage information on the code cache when exiting")\
1083                                                                             \
1084   product(bool, PrintCodeCacheOnCompilation, false,                         \
1085           "Print the code cache memory usage each time a method is "        \
1086           "compiled")                                                       \
1087                                                                             \
1088   diagnostic(bool, PrintStubCode, false,                                    \
1089           "Print generated stub code")                                      \
1090                                                                             \
1091   product(bool, StackTraceInThrowable, true,                                \
1092           "Collect backtrace in throwable when exception happens")          \
1093                                                                             \
1094   product(bool, OmitStackTraceInFastThrow, true,                            \
1095           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1096                                                                             \
1097   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1098           "Print bytecode statistics when dumping profiler output")         \
1099                                                                             \
1100   product(bool, ProfilerRecordPC, false,                                    \
1101           "Collect ticks for each 16 byte interval of compiled code")       \
1102                                                                             \
1103   product(bool, ProfileVM, false,                                           \
1104           "Profile ticks that fall within VM (either in the VM Thread "     \
1105           "or VM code called through stubs)")                               \
1106                                                                             \
1107   product(bool, ProfileIntervals, false,                                    \
1108           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1109                                                                             \
1110   notproduct(bool, ProfilerCheckIntervals, false,                           \
1111           "Collect and print information on spacing of profiler ticks")     \
1112                                                                             \
1113   product(bool, PrintWarnings, true,                                        \
1114           "Print JVM warnings to output stream")                            \
1115                                                                             \
1116   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1117           "Print warnings for stalled SpinLocks")                           \
1118                                                                             \
1119   product(bool, RegisterFinalizersAtInit, true,                             \
1120           "Register finalizable objects at end of Object.<init> or "        \
1121           "after allocation")                                               \
1122                                                                             \
1123   develop(bool, RegisterReferences, true,                                   \
1124           "Tell whether the VM should register soft/weak/final/phantom "    \
1125           "references")                                                     \
1126                                                                             \
1127   develop(bool, IgnoreRewrites, false,                                      \
1128           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1129           "This is unsafe!")                                                \
1130                                                                             \
1131   develop(bool, PrintCodeCacheExtension, false,                             \
1132           "Print extension of code cache")                                  \
1133                                                                             \
1134   develop(bool, UsePrivilegedStack, true,                                   \
1135           "Enable the security JVM functions")                              \
1136                                                                             \
1137   develop(bool, ProtectionDomainVerification, true,                         \
1138           "Verify protection domain before resolution in system dictionary")\
1139                                                                             \
1140   product(bool, ClassUnloading, true,                                       \
1141           "Do unloading of classes")                                        \
1142                                                                             \
1143   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1144           "Do unloading of classes with a concurrent marking cycle")        \
1145                                                                             \
1146   develop(bool, DisableStartThread, false,                                  \
1147           "Disable starting of additional Java threads "                    \
1148           "(for debugging only)")                                           \
1149                                                                             \
1150   develop(bool, MemProfiling, false,                                        \
1151           "Write memory usage profiling to log file")                       \
1152                                                                             \
1153   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1154           "Print the system dictionary at exit")                            \
1155                                                                             \
1156   experimental(intx, PredictedLoadedClassCount, 0,                          \
1157           "Experimental: Tune loaded class cache starting size")            \
1158                                                                             \
1159   diagnostic(bool, UnsyncloadClass, false,                                  \
1160           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1161           "class loader must call VM synchronized for findClass "           \
1162           "and defineClass.")                                               \
1163                                                                             \
1164   product(bool, AlwaysLockClassLoader, false,                               \
1165           "Require the VM to acquire the class loader lock before calling " \
1166           "loadClass() even for class loaders registering "                 \
1167           "as parallel capable")                                            \
1168                                                                             \
1169   product(bool, AllowParallelDefineClass, false,                            \
1170           "Allow parallel defineClass requests for class loaders "          \
1171           "registering as parallel capable")                                \
1172                                                                             \
1173   product(bool, MustCallLoadClassInternal, false,                           \
1174           "Call loadClassInternal() rather than loadClass()")               \
1175                                                                             \
1176   product_pd(bool, DontYieldALot,                                           \
1177           "Throw away obvious excess yield calls")                          \
1178                                                                             \
1179   develop(bool, UseDetachedThreads, true,                                   \
1180           "Use detached threads that are recycled upon termination "        \
1181           "(for Solaris only)")                                             \
1182                                                                             \
1183   product(bool, UseLWPSynchronization, true,                                \
1184           "Use LWP-based instead of libthread-based synchronization "       \
1185           "(SPARC only)")                                                   \
1186                                                                             \
1187   experimental(ccstr, SyncKnobs, NULL,                                      \
1188                "(Unstable) Various monitor synchronization tunables")       \
1189                                                                             \
1190   experimental(intx, EmitSync, 0,                                           \
1191                "(Unsafe, Unstable) "                                        \
1192                "Control emission of inline sync fast-path code")            \
1193                                                                             \
1194   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1195           range(0, max_jint)                                                \
1196                                                                             \
1197   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1198                                                                             \
1199   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1200                 "Percentage of used monitors before triggering cleanup "    \
1201                 "safepoint which deflates monitors (0 is off). "            \
1202                 "The check is performed on GuaranteedSafepointInterval.")   \
1203                 range(0, 100)                                               \
1204                                                                             \
1205   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1206                "Experimental Sync flags")                                   \
1207                                                                             \
1208   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1209                                                                             \
1210   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1211                                                                             \
1212   experimental(intx, hashCode, 5,                                           \
1213                "(Unstable) select hashCode generation algorithm")           \
1214                                                                             \
1215   product(bool, FilterSpuriousWakeups, true,                                \
1216           "When true prevents OS-level spurious, or premature, wakeups "    \
1217           "from Object.wait (Ignored for Windows)")                         \
1218                                                                             \
1219   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1220                                                                             \
1221   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1222                                                                             \
1223   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1224                                                                             \
1225   develop(bool, UsePthreads, false,                                         \
1226           "Use pthread-based instead of libthread-based synchronization "   \
1227           "(SPARC only)")                                                   \
1228                                                                             \
1229   product(bool, ReduceSignalUsage, false,                                   \
1230           "Reduce the use of OS signals in Java and/or the VM")             \
1231                                                                             \
1232   develop_pd(bool, ShareVtableStubs,                                        \
1233           "Share vtable stubs (smaller code but worse branch prediction")   \
1234                                                                             \
1235   develop(bool, LoadLineNumberTables, true,                                 \
1236           "Tell whether the class file parser loads line number tables")    \
1237                                                                             \
1238   develop(bool, LoadLocalVariableTables, true,                              \
1239           "Tell whether the class file parser loads local variable tables") \
1240                                                                             \
1241   develop(bool, LoadLocalVariableTypeTables, true,                          \
1242           "Tell whether the class file parser loads local variable type"    \
1243           "tables")                                                         \
1244                                                                             \
1245   product(bool, AllowUserSignalHandlers, false,                             \
1246           "Do not complain if the application installs signal handlers "    \
1247           "(Solaris & Linux only)")                                         \
1248                                                                             \
1249   product(bool, UseSignalChaining, true,                                    \
1250           "Use signal-chaining to invoke signal handlers installed "        \
1251           "by the application (Solaris & Linux only)")                      \
1252                                                                             \
1253   product(bool, AllowJNIEnvProxy, false,                                    \
1254           "Allow JNIEnv proxies for jdbx")                                  \
1255                                                                             \
1256   product(bool, RestoreMXCSROnJNICalls, false,                              \
1257           "Restore MXCSR when returning from JNI calls")                    \
1258                                                                             \
1259   product(bool, CheckJNICalls, false,                                       \
1260           "Verify all arguments to JNI calls")                              \
1261                                                                             \
1262   product(bool, CheckEndorsedAndExtDirs, false,                             \
1263           "Verify the endorsed and extension directories are not used")     \
1264                                                                             \
1265   product(bool, UseFastJNIAccessors, true,                                  \
1266           "Use optimized versions of Get<Primitive>Field")                  \
1267                                                                             \
1268   product(intx, MaxJNILocalCapacity, 65536,                                 \
1269           "Maximum allowable local JNI handle capacity to "                 \
1270           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1271           "where <= 0 is unlimited, default: 65536")                        \
1272           range(min_intx, max_intx)                                         \
1273                                                                             \
1274   product(bool, EagerXrunInit, false,                                       \
1275           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1276           "but not all -Xrun libraries may support the state of the VM "    \
1277           "at this time")                                                   \
1278                                                                             \
1279   product(bool, PreserveAllAnnotations, false,                              \
1280           "Preserve RuntimeInvisibleAnnotations as well "                   \
1281           "as RuntimeVisibleAnnotations")                                   \
1282                                                                             \
1283   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1284           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1285                                                                             \
1286   product(bool, UseXMMForArrayCopy, false,                                  \
1287           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1288                                                                             \
1289   product(intx, FieldsAllocationStyle, 1,                                   \
1290           "0 - type based with oops first, "                                \
1291           "1 - with oops last, "                                            \
1292           "2 - oops in super and sub classes are together")                 \
1293           range(0, 2)                                                       \
1294                                                                             \
1295   product(bool, CompactFields, true,                                        \
1296           "Allocate nonstatic fields in gaps between previous fields")      \
1297                                                                             \
1298   notproduct(bool, PrintFieldLayout, false,                                 \
1299           "Print field layout for each class")                              \
1300                                                                             \
1301   /* Need to limit the extent of the padding to reasonable size.          */\
1302   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1303   /* aggressive prefetching, while still leaving the room for segregating */\
1304   /* among the distinct pages.                                            */\
1305   product(intx, ContendedPaddingWidth, 128,                                 \
1306           "How many bytes to pad the fields/classes marked @Contended with")\
1307           range(0, 8192)                                                    \
1308           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1309                                                                             \
1310   product(bool, EnableContended, true,                                      \
1311           "Enable @Contended annotation support")                           \
1312                                                                             \
1313   product(bool, RestrictContended, true,                                    \
1314           "Restrict @Contended to trusted classes")                         \
1315                                                                             \
1316   product(bool, UseBiasedLocking, true,                                     \
1317           "Enable biased locking in JVM")                                   \
1318                                                                             \
1319   product(intx, BiasedLockingStartupDelay, 0,                               \
1320           "Number of milliseconds to wait before enabling biased locking")  \
1321           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1322           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1323                                                                             \
1324   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1325           "Print statistics of biased locking in JVM")                      \
1326                                                                             \
1327   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1328           "Threshold of number of revocations per type to try to "          \
1329           "rebias all objects in the heap of that type")                    \
1330           range(0, max_intx)                                                \
1331           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1332                                                                             \
1333   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1334           "Threshold of number of revocations per type to permanently "     \
1335           "revoke biases of all objects in the heap of that type")          \
1336           range(0, max_intx)                                                \
1337           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1338                                                                             \
1339   product(intx, BiasedLockingDecayTime, 25000,                              \
1340           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1341           "type after previous bulk rebias")                                \
1342           range(500, max_intx)                                              \
1343           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1344                                                                             \
1345   product(bool, ExitOnOutOfMemoryError, false,                              \
1346           "JVM exits on the first occurrence of an out-of-memory error")    \
1347                                                                             \
1348   product(bool, CrashOnOutOfMemoryError, false,                             \
1349           "JVM aborts, producing an error log and core/mini dump, on the "  \
1350           "first occurrence of an out-of-memory error")                     \
1351                                                                             \
1352   /* tracing */                                                             \
1353                                                                             \
1354   develop(bool, StressRewriter, false,                                      \
1355           "Stress linktime bytecode rewriting")                             \
1356                                                                             \
1357   product(ccstr, TraceJVMTI, NULL,                                          \
1358           "Trace flags for JVMTI functions and events")                     \
1359                                                                             \
1360   /* This option can change an EMCP method into an obsolete method. */      \
1361   /* This can affect tests that except specific methods to be EMCP. */      \
1362   /* This option should be used with caution.                       */      \
1363   product(bool, StressLdcRewrite, false,                                    \
1364           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1365                                                                             \
1366   /* change to false by default sometime after Mustang */                   \
1367   product(bool, VerifyMergedCPBytecodes, true,                              \
1368           "Verify bytecodes after RedefineClasses constant pool merging")   \
1369                                                                             \
1370   develop(bool, TraceBytecodes, false,                                      \
1371           "Trace bytecode execution")                                       \
1372                                                                             \
1373   develop(bool, TraceICs, false,                                            \
1374           "Trace inline cache changes")                                     \
1375                                                                             \
1376   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1377           "Trace method invocation counter overflow")                       \
1378                                                                             \
1379   develop(bool, TraceInlineCacheClearing, false,                            \
1380           "Trace clearing of inline caches in nmethods")                    \
1381                                                                             \
1382   develop(bool, TraceDependencies, false,                                   \
1383           "Trace dependencies")                                             \
1384                                                                             \
1385   develop(bool, VerifyDependencies, trueInDebug,                            \
1386           "Exercise and verify the compilation dependency mechanism")       \
1387                                                                             \
1388   develop(bool, TraceNewOopMapGeneration, false,                            \
1389           "Trace OopMapGeneration")                                         \
1390                                                                             \
1391   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1392           "Trace OopMapGeneration: print detailed cell states")             \
1393                                                                             \
1394   develop(bool, TimeOopMap, false,                                          \
1395           "Time calls to GenerateOopMap::compute_map() in sum")             \
1396                                                                             \
1397   develop(bool, TimeOopMap2, false,                                         \
1398           "Time calls to GenerateOopMap::compute_map() individually")       \
1399                                                                             \
1400   develop(bool, TraceOopMapRewrites, false,                                 \
1401           "Trace rewriting of method oops during oop map generation")       \
1402                                                                             \
1403   develop(bool, TraceICBuffer, false,                                       \
1404           "Trace usage of IC buffer")                                       \
1405                                                                             \
1406   develop(bool, TraceCompiledIC, false,                                     \
1407           "Trace changes of compiled IC")                                   \
1408                                                                             \
1409   /* gc */                                                                  \
1410                                                                             \
1411   product(bool, UseSerialGC, false,                                         \
1412           "Use the Serial garbage collector")                               \
1413                                                                             \
1414   product(bool, UseG1GC, false,                                             \
1415           "Use the Garbage-First garbage collector")                        \
1416                                                                             \
1417   product(bool, UseParallelGC, false,                                       \
1418           "Use the Parallel Scavenge garbage collector")                    \
1419                                                                             \
1420   product(bool, UseParallelOldGC, false,                                    \
1421           "Use the Parallel Old garbage collector")                         \
1422                                                                             \
1423   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1424           "How often should we maximally compact the heap (not allowing "   \
1425           "any dead space)")                                                \
1426           range(0, max_uintx)                                               \
1427                                                                             \
1428   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1429           "The collection count for the first maximum compaction")          \
1430           range(0, max_uintx)                                               \
1431                                                                             \
1432   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1433           "Use maximum compaction in the Parallel Old garbage collector "   \
1434           "for a system GC")                                                \
1435                                                                             \
1436   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1437           "The mean used by the parallel compact dead wood "                \
1438           "limiter (a number between 0-100)")                               \
1439           range(0, 100)                                                     \
1440                                                                             \
1441   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1442           "The standard deviation used by the parallel compact dead wood "  \
1443           "limiter (a number between 0-100)")                               \
1444           range(0, 100)                                                     \
1445                                                                             \
1446   product(uint, ParallelGCThreads, 0,                                       \
1447           "Number of parallel threads parallel gc will use")                \
1448           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1449                                                                             \
1450   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1451             "Use semaphore synchronization for the GC Threads, "            \
1452             "instead of synchronization based on mutexes")                  \
1453                                                                             \
1454   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1455           "Dynamically choose the number of parallel threads "              \
1456           "parallel gc will use")                                           \
1457                                                                             \
1458   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1459              "Inject thread creation failures for "                         \
1460              "UseDynamicNumberOfGCThreads")                                 \
1461                                                                             \
1462   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1463           "Force dynamic selection of the number of "                       \
1464           "parallel threads parallel gc will use to aid debugging")         \
1465                                                                             \
1466   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1467           "Size of heap (bytes) per GC thread used in calculating the "     \
1468           "number of GC threads")                                           \
1469           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1470                                                                             \
1471   product(uint, ConcGCThreads, 0,                                           \
1472           "Number of threads concurrent gc will use")                       \
1473           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1474                                                                             \
1475   product(uint, GCTaskTimeStampEntries, 200,                                \
1476           "Number of time stamp entries per gc worker thread")              \
1477           range(1, max_jint)                                                \
1478                                                                             \
1479   product(bool, AlwaysTenure, false,                                        \
1480           "Always tenure objects in eden (ParallelGC only)")                \
1481                                                                             \
1482   product(bool, NeverTenure, false,                                         \
1483           "Never tenure objects in eden, may tenure on overflow "           \
1484           "(ParallelGC only)")                                              \
1485                                                                             \
1486   product(bool, ScavengeBeforeFullGC, true,                                 \
1487           "Scavenge youngest generation before each full GC.")              \
1488                                                                             \
1489   product(bool, UseConcMarkSweepGC, false,                                  \
1490           "Use Concurrent Mark-Sweep GC in the old generation")             \
1491                                                                             \
1492   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1493           "A System.gc() request invokes a concurrent collection; "         \
1494           "(effective only when using concurrent collectors)")              \
1495                                                                             \
1496   product(bool, GCLockerInvokesConcurrent, false,                           \
1497           "The exit of a JNI critical section necessitating a scavenge, "   \
1498           "also kicks off a background concurrent collection")              \
1499                                                                             \
1500   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1501           "How much the GC can expand the eden by while the GC locker "     \
1502           "is active (as a percentage)")                                    \
1503           range(0, 100)                                                     \
1504                                                                             \
1505   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1506           "Number of times to retry allocations when "                      \
1507           "blocked by the GC locker")                                       \
1508           range(0, max_uintx)                                               \
1509                                                                             \
1510   product(bool, UseCMSBestFit, true,                                        \
1511           "Use CMS best fit allocation strategy")                           \
1512                                                                             \
1513   product(uintx, ParallelGCBufferWastePct, 10,                              \
1514           "Wasted fraction of parallel allocation buffer")                  \
1515           range(0, 100)                                                     \
1516                                                                             \
1517   product(uintx, TargetPLABWastePct, 10,                                    \
1518           "Target wasted space in last buffer as percent of overall "       \
1519           "allocation")                                                     \
1520           range(1, 100)                                                     \
1521                                                                             \
1522   product(uintx, PLABWeight, 75,                                            \
1523           "Percentage (0-100) used to weight the current sample when "      \
1524           "computing exponentially decaying average for ResizePLAB")        \
1525           range(0, 100)                                                     \
1526                                                                             \
1527   product(bool, ResizePLAB, true,                                           \
1528           "Dynamically resize (survivor space) promotion LAB's")            \
1529                                                                             \
1530   product(int, ParGCArrayScanChunk, 50,                                     \
1531           "Scan a subset of object array and push remainder, if array is "  \
1532           "bigger than this")                                               \
1533           range(1, max_jint/3)                                              \
1534                                                                             \
1535   product(bool, ParGCUseLocalOverflow, false,                               \
1536           "Instead of a global overflow list, use local overflow stacks")   \
1537                                                                             \
1538   product(bool, ParGCTrimOverflow, true,                                    \
1539           "Eagerly trim the local overflow lists "                          \
1540           "(when ParGCUseLocalOverflow)")                                   \
1541                                                                             \
1542   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1543           "Simulate work queue overflow in ParNew")                         \
1544                                                                             \
1545   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1546           "An `interval' counter that determines how frequently "           \
1547           "we simulate overflow; a smaller number increases frequency")     \
1548                                                                             \
1549   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1550           "The desired number of objects to claim from the overflow list")  \
1551           range(0, max_uintx)                                               \
1552                                                                             \
1553   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1554           "The number of strides per worker thread that we divide up the "  \
1555           "card table scanning work into")                                  \
1556           range(1, max_uintx)                                               \
1557           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1558                                                                             \
1559   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1560           "The number of cards in each chunk of the parallel chunks used "  \
1561           "during card table scanning")                                     \
1562           range(1, max_intx)                                                \
1563           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1564                                                                             \
1565   product(uintx, OldPLABWeight, 50,                                         \
1566           "Percentage (0-100) used to weight the current sample when "      \
1567           "computing exponentially decaying average for resizing "          \
1568           "OldPLABSize")                                                    \
1569           range(0, 100)                                                     \
1570                                                                             \
1571   product(bool, ResizeOldPLAB, true,                                        \
1572           "Dynamically resize (old gen) promotion LAB's")                   \
1573                                                                             \
1574   product(size_t, CMSOldPLABMax, 1024,                                      \
1575           "Maximum size of CMS gen promotion LAB caches per worker "        \
1576           "per block size")                                                 \
1577           range(1, max_uintx)                                               \
1578           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1579                                                                             \
1580   product(size_t, CMSOldPLABMin, 16,                                        \
1581           "Minimum size of CMS gen promotion LAB caches per worker "        \
1582           "per block size")                                                 \
1583           range(1, max_uintx)                                               \
1584           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1585                                                                             \
1586   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1587           "Nominal number of refills of CMS gen promotion LAB cache "       \
1588           "per worker per block size")                                      \
1589           range(1, max_uintx)                                               \
1590                                                                             \
1591   product(bool, CMSOldPLABResizeQuicker, false,                             \
1592           "React on-the-fly during a scavenge to a sudden "                 \
1593           "change in block demand rate")                                    \
1594                                                                             \
1595   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1596           "The tolerance of the phase-change detector for on-the-fly "      \
1597           "PLAB resizing during a scavenge")                                \
1598           range(1, max_uintx)                                               \
1599                                                                             \
1600   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1601           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1602           "during a scavenge")                                              \
1603           range(1, max_uintx)                                               \
1604                                                                             \
1605   product(bool, AlwaysPreTouch, false,                                      \
1606           "Force all freshly committed pages to be pre-touched")            \
1607                                                                             \
1608   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1609           "Per-thread chunk size for parallel memory pre-touch.")           \
1610           range(1, SIZE_MAX / 2)                                            \
1611                                                                             \
1612   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1613           "The maximum size of young gen chosen by default per GC worker "  \
1614           "thread available")                                               \
1615           range(1, max_uintx)                                               \
1616                                                                             \
1617   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1618           "Percentage (0-100) used to add conservatism when computing the " \
1619           "duty cycle")                                                     \
1620           range(0, 100)                                                     \
1621                                                                             \
1622   product(uintx, CMSExpAvgFactor, 50,                                       \
1623           "Percentage (0-100) used to weight the current sample when "      \
1624           "computing exponential averages for CMS statistics")              \
1625           range(0, 100)                                                     \
1626                                                                             \
1627   product(uintx, CMS_FLSWeight, 75,                                         \
1628           "Percentage (0-100) used to weight the current sample when "      \
1629           "computing exponentially decaying averages for CMS FLS "          \
1630           "statistics")                                                     \
1631           range(0, 100)                                                     \
1632                                                                             \
1633   product(uintx, CMS_FLSPadding, 1,                                         \
1634           "The multiple of deviation from mean to use for buffering "       \
1635           "against volatility in free list demand")                         \
1636           range(0, max_juint)                                               \
1637                                                                             \
1638   product(uintx, FLSCoalescePolicy, 2,                                      \
1639           "CMS: aggressiveness level for coalescing, increasing "           \
1640           "from 0 to 4")                                                    \
1641           range(0, 4)                                                       \
1642                                                                             \
1643   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1644           "CMS: larger free blocks are always available for coalescing")    \
1645                                                                             \
1646   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1647           "CMS: the smaller the percentage the greater the coalescing "     \
1648           "force")                                                          \
1649           range(0.0, 1.0)                                                   \
1650                                                                             \
1651   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1652           "CMS: the factor by which to inflate estimated demand of small "  \
1653           "block sizes to prevent coalescing with an adjoining block")      \
1654           range(0.0, DBL_MAX)                                               \
1655                                                                             \
1656   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1657           "CMS: the factor by which to inflate estimated demand of large "  \
1658           "block sizes to prevent coalescing with an adjoining block")      \
1659           range(0.0, DBL_MAX)                                               \
1660                                                                             \
1661   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1662           "CMS: the factor by which to inflate estimated demand of small "  \
1663           "block sizes to prevent splitting to supply demand for smaller "  \
1664           "blocks")                                                         \
1665           range(0.0, DBL_MAX)                                               \
1666                                                                             \
1667   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1668           "CMS: the factor by which to inflate estimated demand of large "  \
1669           "block sizes to prevent splitting to supply demand for smaller "  \
1670           "blocks")                                                         \
1671           range(0.0, DBL_MAX)                                               \
1672                                                                             \
1673   product(bool, CMSExtrapolateSweep, false,                                 \
1674           "CMS: cushion for block demand during sweep")                     \
1675                                                                             \
1676   product(uintx, CMS_SweepWeight, 75,                                       \
1677           "Percentage (0-100) used to weight the current sample when "      \
1678           "computing exponentially decaying average for inter-sweep "       \
1679           "duration")                                                       \
1680           range(0, 100)                                                     \
1681                                                                             \
1682   product(uintx, CMS_SweepPadding, 1,                                       \
1683           "The multiple of deviation from mean to use for buffering "       \
1684           "against volatility in inter-sweep duration")                     \
1685           range(0, max_juint)                                               \
1686                                                                             \
1687   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1688           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1689           "duration exceeds this threshold in milliseconds")                \
1690           range(0, max_uintx)                                               \
1691                                                                             \
1692   product(bool, CMSClassUnloadingEnabled, true,                             \
1693           "Whether class unloading enabled when using CMS GC")              \
1694                                                                             \
1695   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1696           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1697           "count for which classes may not be unloaded")                    \
1698           range(0, max_uintx)                                               \
1699                                                                             \
1700   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1701           "Replenish an indexed free list with this number of chunks")      \
1702           range(1, max_uintx)                                               \
1703                                                                             \
1704   product(bool, CMSReplenishIntermediate, true,                             \
1705           "Replenish all intermediate free-list caches")                    \
1706                                                                             \
1707   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1708           "When satisfying batched demand, split blocks from the "          \
1709           "IndexedFreeList whose size is a multiple of requested size")     \
1710                                                                             \
1711   product(bool, CMSLoopWarn, false,                                         \
1712           "Warn in case of excessive CMS looping")                          \
1713                                                                             \
1714   /* where does the range max value of (max_jint - 1) come from? */         \
1715   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1716           "Maximum size of marking stack")                                  \
1717           range(1, (max_jint - 1))                                          \
1718                                                                             \
1719   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1720           "Size of marking stack")                                          \
1721           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1722                                                                             \
1723   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1724           "Simulate frequent marking stack / work queue overflow")          \
1725                                                                             \
1726   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1727           "An \"interval\" counter that determines how frequently "         \
1728           "to simulate overflow; a smaller number increases frequency")     \
1729                                                                             \
1730   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1731           "Maximum number of abortable preclean iterations, if > 0")        \
1732           range(0, max_uintx)                                               \
1733                                                                             \
1734   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1735           "Maximum time in abortable preclean (in milliseconds)")           \
1736           range(0, max_intx)                                                \
1737                                                                             \
1738   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1739           "Nominal minimum work per abortable preclean iteration")          \
1740           range(0, max_uintx)                                               \
1741                                                                             \
1742   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1743           "Time that we sleep between iterations when not given "           \
1744           "enough work per iteration")                                      \
1745           range(0, max_intx)                                                \
1746                                                                             \
1747   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1748   product(size_t, CMSRescanMultiple, 32,                                    \
1749           "Size (in cards) of CMS parallel rescan task")                    \
1750           range(1, SIZE_MAX / 4096)                                         \
1751           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1752                                                                             \
1753   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1754   product(size_t, CMSConcMarkMultiple, 32,                                  \
1755           "Size (in cards) of CMS concurrent MT marking task")              \
1756           range(1, SIZE_MAX / 4096)                                         \
1757           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1758                                                                             \
1759   product(bool, CMSAbortSemantics, false,                                   \
1760           "Whether abort-on-overflow semantics is implemented")             \
1761                                                                             \
1762   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1763           "Use the parallel initial mark.")                                 \
1764                                                                             \
1765   product(bool, CMSParallelRemarkEnabled, true,                             \
1766           "Whether parallel remark enabled (only if ParNewGC)")             \
1767                                                                             \
1768   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1769           "Whether parallel remark of survivor space "                      \
1770           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1771                                                                             \
1772   product(bool, CMSPLABRecordAlways, true,                                  \
1773           "Always record survivor space PLAB boundaries (effective only "   \
1774           "if CMSParallelSurvivorRemarkEnabled)")                           \
1775                                                                             \
1776   product(bool, CMSEdenChunksRecordAlways, true,                            \
1777           "Always record eden chunks used for the parallel initial mark "   \
1778           "or remark of eden")                                              \
1779                                                                             \
1780   product(bool, CMSConcurrentMTEnabled, true,                               \
1781           "Whether multi-threaded concurrent work enabled "                 \
1782           "(effective only if ParNewGC)")                                   \
1783                                                                             \
1784   product(bool, CMSPrecleaningEnabled, true,                                \
1785           "Whether concurrent precleaning enabled")                         \
1786                                                                             \
1787   product(uintx, CMSPrecleanIter, 3,                                        \
1788           "Maximum number of precleaning iteration passes")                 \
1789           range(0, 9)                                                       \
1790                                                                             \
1791   product(uintx, CMSPrecleanDenominator, 3,                                 \
1792           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1793           "ratio")                                                          \
1794           range(1, max_uintx)                                               \
1795           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1796                                                                             \
1797   product(uintx, CMSPrecleanNumerator, 2,                                   \
1798           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1799           "ratio")                                                          \
1800           range(0, max_uintx-1)                                             \
1801           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1802                                                                             \
1803   product(bool, CMSPrecleanRefLists1, true,                                 \
1804           "Preclean ref lists during (initial) preclean phase")             \
1805                                                                             \
1806   product(bool, CMSPrecleanRefLists2, false,                                \
1807           "Preclean ref lists during abortable preclean phase")             \
1808                                                                             \
1809   product(bool, CMSPrecleanSurvivors1, false,                               \
1810           "Preclean survivors during (initial) preclean phase")             \
1811                                                                             \
1812   product(bool, CMSPrecleanSurvivors2, true,                                \
1813           "Preclean survivors during abortable preclean phase")             \
1814                                                                             \
1815   product(uintx, CMSPrecleanThreshold, 1000,                                \
1816           "Do not iterate again if number of dirty cards is less than this")\
1817           range(100, max_uintx)                                             \
1818                                                                             \
1819   product(bool, CMSCleanOnEnter, true,                                      \
1820           "Clean-on-enter optimization for reducing number of dirty cards") \
1821                                                                             \
1822   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1823           "Choose variant (1,2) of verification following remark")          \
1824           range(1, 2)                                                       \
1825                                                                             \
1826   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1827           "If Eden size is below this, do not try to schedule remark")      \
1828           range(0, max_uintx)                                               \
1829                                                                             \
1830   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1831           "The Eden occupancy percentage (0-100) at which "                 \
1832           "to try and schedule remark pause")                               \
1833           range(0, 100)                                                     \
1834                                                                             \
1835   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1836           "Start sampling eden top at least before young gen "              \
1837           "occupancy reaches 1/<ratio> of the size at which "               \
1838           "we plan to schedule remark")                                     \
1839           range(1, max_uintx)                                               \
1840                                                                             \
1841   product(uintx, CMSSamplingGrain, 16*K,                                    \
1842           "The minimum distance between eden samples for CMS (see above)")  \
1843           range(ObjectAlignmentInBytes, max_uintx)                          \
1844           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1845                                                                             \
1846   product(bool, CMSScavengeBeforeRemark, false,                             \
1847           "Attempt scavenge before the CMS remark step")                    \
1848                                                                             \
1849   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1850           "Don't drain below this size per parallel worker/thief")          \
1851           range(1, max_juint)                                               \
1852           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1853                                                                             \
1854   manageable(intx, CMSWaitDuration, 2000,                                   \
1855           "Time in milliseconds that CMS thread waits for young GC")        \
1856           range(min_jint, max_jint)                                         \
1857                                                                             \
1858   develop(uintx, CMSCheckInterval, 1000,                                    \
1859           "Interval in milliseconds that CMS thread checks if it "          \
1860           "should start a collection cycle")                                \
1861                                                                             \
1862   product(bool, CMSYield, true,                                             \
1863           "Yield between steps of CMS")                                     \
1864                                                                             \
1865   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1866           "Bitmap operations should process at most this many bits "        \
1867           "between yields")                                                 \
1868           range(1, max_uintx)                                               \
1869           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1870                                                                             \
1871   product(bool, CMSPrintChunksInDump, false,                                \
1872           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1873           "trace level include more detailed information about the"         \
1874           "free chunks")                \
1875                                                                             \
1876   product(bool, CMSPrintObjectsInDump, false,                               \
1877           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1878           "trace level include more detailed information about the"         \
1879           "allocated objects")                                              \
1880                                                                             \
1881   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1882           "Verify that all references across the FLS boundary "             \
1883           "are to valid objects")                                           \
1884                                                                             \
1885   diagnostic(bool, FLSVerifyLists, false,                                   \
1886           "Do lots of (expensive) FreeListSpace verification")              \
1887                                                                             \
1888   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1889           "Do lots of (expensive) FLS index table verification")            \
1890                                                                             \
1891   develop(bool, FLSVerifyDictionary, false,                                 \
1892           "Do lots of (expensive) FLS dictionary verification")             \
1893                                                                             \
1894   develop(bool, VerifyBlockOffsetArray, false,                              \
1895           "Do (expensive) block offset array verification")                 \
1896                                                                             \
1897   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1898           "Maintain _unallocated_block in BlockOffsetArray "                \
1899           "(currently applicable only to CMS collector)")                   \
1900                                                                             \
1901   product(intx, RefDiscoveryPolicy, 0,                                      \
1902           "Select type of reference discovery policy: "                     \
1903           "reference-based(0) or referent-based(1)")                        \
1904           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1905                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1906                                                                             \
1907   product(bool, ParallelRefProcEnabled, false,                              \
1908           "Enable parallel reference processing whenever possible")         \
1909                                                                             \
1910   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1911           "Enable balancing of reference processing queues")                \
1912                                                                             \
1913   product(uintx, CMSTriggerRatio, 80,                                       \
1914           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1915           "allocated before a CMS collection cycle commences")              \
1916           range(0, 100)                                                     \
1917                                                                             \
1918   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1919           "Percentage CMS generation occupancy at which to "                \
1920           "initiate CMS collection for bootstrapping collection stats")     \
1921           range(0, 100)                                                     \
1922                                                                             \
1923   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1924           "Percentage CMS generation occupancy to start a CMS collection "  \
1925           "cycle. A negative value means that CMSTriggerRatio is used")     \
1926           range(min_intx, 100)                                              \
1927                                                                             \
1928   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1929           "The percent occupancy (IHOP) of the current old generation "     \
1930           "capacity above which a concurrent mark cycle will be initiated " \
1931           "Its value may change over time if adaptive IHOP is enabled, "    \
1932           "otherwise the value remains constant. "                          \
1933           "In the latter case a value of 0 will result as frequent as "     \
1934           "possible concurrent marking cycles. A value of 100 disables "    \
1935           "concurrent marking. "                                            \
1936           "Fragmentation waste in the old generation is not considered "    \
1937           "free space in this calculation. (G1 collector only)")            \
1938           range(0, 100)                                                     \
1939                                                                             \
1940   manageable(intx, CMSTriggerInterval, -1,                                  \
1941           "Commence a CMS collection cycle (at least) every so many "       \
1942           "milliseconds (0 permanently, -1 disabled)")                      \
1943           range(-1, max_intx)                                               \
1944                                                                             \
1945   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1946           "Only use occupancy as a criterion for starting a CMS collection")\
1947                                                                             \
1948   product(uintx, CMSIsTooFullPercentage, 98,                                \
1949           "An absolute ceiling above which CMS will always consider the "   \
1950           "unloading of classes when class unloading is enabled")           \
1951           range(0, 100)                                                     \
1952                                                                             \
1953   develop(bool, CMSTestInFreeList, false,                                   \
1954           "Check if the coalesced range is already in the "                 \
1955           "free lists as claimed")                                          \
1956                                                                             \
1957   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1958           "Check that all the garbage collected was returned to the "       \
1959           "free lists")                                                     \
1960                                                                             \
1961   notproduct(bool, ScavengeALot, false,                                     \
1962           "Force scavenge at every Nth exit from the runtime system "       \
1963           "(N=ScavengeALotInterval)")                                       \
1964                                                                             \
1965   develop(bool, FullGCALot, false,                                          \
1966           "Force full gc at every Nth exit from the runtime system "        \
1967           "(N=FullGCALotInterval)")                                         \
1968                                                                             \
1969   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1970           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1971                                                                             \
1972   notproduct(bool, PromotionFailureALot, false,                             \
1973           "Use promotion failure handling on every youngest generation "    \
1974           "collection")                                                     \
1975                                                                             \
1976   develop(uintx, PromotionFailureALotCount, 1000,                           \
1977           "Number of promotion failures occurring at PLAB "                 \
1978           "refill attempts (ParNew) or promotion attempts "                 \
1979           "(other young collectors)")                                       \
1980                                                                             \
1981   develop(uintx, PromotionFailureALotInterval, 5,                           \
1982           "Total collections between promotion failures a lot")             \
1983                                                                             \
1984   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1985           "Sleep time when sleep is used for yields")                       \
1986                                                                             \
1987   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1988           "Number of yields before a sleep is done during work stealing")   \
1989                                                                             \
1990   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1991           "Number of iterations in a spin loop between checks on "          \
1992           "time out of hard spin")                                          \
1993                                                                             \
1994   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1995           "Ratio of hard spins to calls to yield")                          \
1996                                                                             \
1997   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1998           "Number of object array elements to push onto the marking stack " \
1999           "before pushing a continuation entry")                            \
2000                                                                             \
2001   develop(bool, MetadataAllocationFailALot, false,                          \
2002           "Fail metadata allocations at intervals controlled by "           \
2003           "MetadataAllocationFailALotInterval")                             \
2004                                                                             \
2005   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2006           "Metadata allocation failure a lot interval")                     \
2007                                                                             \
2008   notproduct(bool, ExecuteInternalVMTests, false,                           \
2009           "Enable execution of internal VM tests")                          \
2010                                                                             \
2011   notproduct(bool, VerboseInternalVMTests, false,                           \
2012           "Turn on logging for internal VM tests.")                         \
2013                                                                             \
2014   product(bool, ExecutingUnitTests, false,                                  \
2015           "Whether the JVM is running unit tests or not")                   \
2016                                                                             \
2017   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2018                                                                             \
2019   product_pd(bool, ResizeTLAB,                                              \
2020           "Dynamically resize TLAB size for threads")                       \
2021                                                                             \
2022   product(bool, ZeroTLAB, false,                                            \
2023           "Zero out the newly created TLAB")                                \
2024                                                                             \
2025   product(bool, FastTLABRefill, true,                                       \
2026           "Use fast TLAB refill code")                                      \
2027                                                                             \
2028   product(bool, TLABStats, true,                                            \
2029           "Provide more detailed and expensive TLAB statistics.")           \
2030                                                                             \
2031   product_pd(bool, NeverActAsServerClassMachine,                            \
2032           "Never act like a server-class machine")                          \
2033                                                                             \
2034   product(bool, AlwaysActAsServerClassMachine, false,                       \
2035           "Always act like a server-class machine")                         \
2036                                                                             \
2037   product_pd(uint64_t, MaxRAM,                                              \
2038           "Real memory size (in bytes) used to set maximum heap size")      \
2039           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2040                                                                             \
2041   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2042           "Maximum ergonomically set heap size (in bytes); zero means use " \
2043           "MaxRAM / MaxRAMFraction")                                        \
2044           range(0, max_uintx)                                               \
2045                                                                             \
2046   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2047           "Use CGroup memory limit as physical memory limit for heap "      \
2048           "sizing")                                                         \
2049                                                                             \
2050   product(uintx, MaxRAMFraction, 4,                                         \
2051           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2052           "size")                                                           \
2053           range(1, max_uintx)                                               \
2054                                                                             \
2055   product(uintx, MinRAMFraction, 2,                                         \
2056           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2057           "size on systems with small physical memory size")                \
2058           range(1, max_uintx)                                               \
2059                                                                             \
2060   product(uintx, InitialRAMFraction, 64,                                    \
2061           "Fraction (1/n) of real memory used for initial heap size")       \
2062           range(1, max_uintx)                                               \
2063                                                                             \
2064   develop(uintx, MaxVirtMemFraction, 2,                                     \
2065           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2066           "determining maximum heap size")                                  \
2067                                                                             \
2068   product(bool, UseAdaptiveSizePolicy, true,                                \
2069           "Use adaptive generation sizing policies")                        \
2070                                                                             \
2071   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2072           "Use adaptive survivor sizing policies")                          \
2073                                                                             \
2074   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2075           "Use adaptive young-old sizing policies at minor collections")    \
2076                                                                             \
2077   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2078           "Use adaptive young-old sizing policies at major collections")    \
2079                                                                             \
2080   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2081           "Include statistics from System.gc() for adaptive size policy")   \
2082                                                                             \
2083   product(bool, UseAdaptiveGCBoundary, false,                               \
2084           "Allow young-old boundary to move")                               \
2085                                                                             \
2086   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2087           "Resize the virtual spaces of the young or old generations")      \
2088           range(-1, 1)                                                      \
2089                                                                             \
2090   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2091           "Policy for changing generation size for throughput goals")       \
2092           range(0, 1)                                                       \
2093                                                                             \
2094   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2095           "Number of steps where heuristics is used before data is used")   \
2096           range(0, max_uintx)                                               \
2097                                                                             \
2098   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2099           "Number of collections before the adaptive sizing is started")    \
2100                                                                             \
2101   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2102           "Collection interval for printing information; zero means never") \
2103           range(0, max_uintx)                                               \
2104                                                                             \
2105   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2106           "Use adaptive minimum footprint as a goal")                       \
2107                                                                             \
2108   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2109           "Weight given to exponential resizing, between 0 and 100")        \
2110           range(0, 100)                                                     \
2111                                                                             \
2112   product(uintx, AdaptiveTimeWeight,       25,                              \
2113           "Weight given to time in adaptive policy, between 0 and 100")     \
2114           range(0, 100)                                                     \
2115                                                                             \
2116   product(uintx, PausePadding, 1,                                           \
2117           "How much buffer to keep for pause time")                         \
2118           range(0, max_juint)                                               \
2119                                                                             \
2120   product(uintx, PromotedPadding, 3,                                        \
2121           "How much buffer to keep for promotion failure")                  \
2122           range(0, max_juint)                                               \
2123                                                                             \
2124   product(uintx, SurvivorPadding, 3,                                        \
2125           "How much buffer to keep for survivor overflow")                  \
2126           range(0, max_juint)                                               \
2127                                                                             \
2128   product(uintx, ThresholdTolerance, 10,                                    \
2129           "Allowed collection cost difference between generations")         \
2130           range(0, 100)                                                     \
2131                                                                             \
2132   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2133           "If collection costs are within margin, reduce both by full "     \
2134           "delta")                                                          \
2135           range(0, 100)                                                     \
2136                                                                             \
2137   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2138           "Adaptive size percentage change in young generation")            \
2139           range(0, 100)                                                     \
2140                                                                             \
2141   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2142           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2143           range(0, 100)                                                     \
2144                                                                             \
2145   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2146           "Decay factor to YoungedGenerationSizeSupplement")                \
2147           range(1, max_uintx)                                               \
2148                                                                             \
2149   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2150           "Adaptive size percentage change in tenured generation")          \
2151           range(0, 100)                                                     \
2152                                                                             \
2153   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2154           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2155           range(0, 100)                                                     \
2156                                                                             \
2157   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2158           "Decay factor to TenuredGenerationSizeIncrement")                 \
2159           range(1, max_uintx)                                               \
2160                                                                             \
2161   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2162           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2163           "or (G1 Only) the maximum GC time per MMU time slice")            \
2164           range(1, max_uintx - 1)                                           \
2165           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2166                                                                             \
2167   product(uintx, GCPauseIntervalMillis, 0,                                  \
2168           "Time slice for MMU specification")                               \
2169           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2170                                                                             \
2171   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2172           "Adaptive size policy maximum GC minor pause time goal "          \
2173           "in millisecond")                                                 \
2174           range(0, max_uintx)                                               \
2175                                                                             \
2176   product(uintx, GCTimeRatio, 99,                                           \
2177           "Adaptive size policy application time to GC time ratio")         \
2178           range(0, max_juint)                                               \
2179                                                                             \
2180   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2181           "Adaptive size scale down factor for shrinking")                  \
2182           range(1, max_uintx)                                               \
2183                                                                             \
2184   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2185           "Adaptive size decays the major cost for long major intervals")   \
2186                                                                             \
2187   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2188           "Time scale over which major costs decay")                        \
2189           range(0, max_uintx)                                               \
2190                                                                             \
2191   product(uintx, MinSurvivorRatio, 3,                                       \
2192           "Minimum ratio of young generation/survivor space size")          \
2193           range(3, max_uintx)                                               \
2194                                                                             \
2195   product(uintx, InitialSurvivorRatio, 8,                                   \
2196           "Initial ratio of young generation/survivor space size")          \
2197           range(0, max_uintx)                                               \
2198                                                                             \
2199   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2200           "Estimate of footprint other than Java Heap")                     \
2201           range(0, max_uintx)                                               \
2202                                                                             \
2203   product(bool, UseGCOverheadLimit, true,                                   \
2204           "Use policy to limit of proportion of time spent in GC "          \
2205           "before an OutOfMemory error is thrown")                          \
2206                                                                             \
2207   product(uintx, GCTimeLimit, 98,                                           \
2208           "Limit of the proportion of time spent in GC before "             \
2209           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2210           range(0, 100)                                                     \
2211                                                                             \
2212   product(uintx, GCHeapFreeLimit, 2,                                        \
2213           "Minimum percentage of free space after a full GC before an "     \
2214           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2215           range(0, 100)                                                     \
2216                                                                             \
2217   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2218           "Number of consecutive collections before gc time limit fires")   \
2219           range(1, max_uintx)                                               \
2220                                                                             \
2221   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2222           "How far ahead to prefetch destination area (<= 0 means off)")    \
2223           range(-1, max_jint)                                               \
2224                                                                             \
2225   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2226           "How far ahead to prefetch scan area (<= 0 means off)")           \
2227           range(-1, max_jint)                                               \
2228                                                                             \
2229   product(intx, PrefetchFieldsAhead, -1,                                    \
2230           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2231           range(-1, max_jint)                                               \
2232                                                                             \
2233   diagnostic(bool, VerifyDuringStartup, false,                              \
2234           "Verify memory system before executing any Java code "            \
2235           "during VM initialization")                                       \
2236                                                                             \
2237   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2238           "Verify system before exiting")                                   \
2239                                                                             \
2240   diagnostic(bool, VerifyBeforeGC, false,                                   \
2241           "Verify memory system before GC")                                 \
2242                                                                             \
2243   diagnostic(bool, VerifyAfterGC, false,                                    \
2244           "Verify memory system after GC")                                  \
2245                                                                             \
2246   diagnostic(bool, VerifyDuringGC, false,                                   \
2247           "Verify memory system during GC (between phases)")                \
2248                                                                             \
2249   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2250           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2251           "are enabled. One or more sub-systems can be specified "          \
2252           "in a comma separated string. Sub-systems are: "                  \
2253           "threads, heap, symbol_table, string_table, codecache, "          \
2254           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2255           "codecache_oops")                                                 \
2256                                                                             \
2257   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2258           "Enable parallel memory system verification")                     \
2259                                                                             \
2260   diagnostic(bool, DeferInitialCardMark, false,                             \
2261           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2262           "may arise from new_pre_store_barrier")                           \
2263                                                                             \
2264   product(bool, UseCondCardMark, false,                                     \
2265           "Check for already marked card before updating card table")       \
2266                                                                             \
2267   diagnostic(bool, VerifyRememberedSets, false,                             \
2268           "Verify GC remembered sets")                                      \
2269                                                                             \
2270   diagnostic(bool, VerifyObjectStartArray, true,                            \
2271           "Verify GC object start array if verify before/after")            \
2272                                                                             \
2273   product(bool, DisableExplicitGC, false,                                   \
2274           "Ignore calls to System.gc()")                                    \
2275                                                                             \
2276   notproduct(bool, CheckMemoryInitialization, false,                        \
2277           "Check memory initialization")                                    \
2278                                                                             \
2279   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2280           "Bind CMS Thread to CPU if possible")                             \
2281                                                                             \
2282   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2283           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2284           range(0, max_juint)                                               \
2285                                                                             \
2286   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2287           "Bind GCTaskThreads to CPUs if possible")                         \
2288                                                                             \
2289   product(bool, UseGCTaskAffinity, false,                                   \
2290           "Use worker affinity when asking for GCTasks")                    \
2291                                                                             \
2292   product(uintx, ProcessDistributionStride, 4,                              \
2293           "Stride through processors when distributing processes")          \
2294           range(0, max_juint)                                               \
2295                                                                             \
2296   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2297           "Number of times the coordinator GC thread will sleep while "     \
2298           "yielding before giving up and resuming GC")                      \
2299           range(0, max_juint)                                               \
2300                                                                             \
2301   product(uintx, CMSYieldSleepCount, 0,                                     \
2302           "Number of times a GC thread (minus the coordinator) "            \
2303           "will sleep while yielding before giving up and resuming GC")     \
2304           range(0, max_juint)                                               \
2305                                                                             \
2306   product(bool, PrintGC, false,                                             \
2307           "Print message at garbage collection. "                           \
2308           "Deprecated, use -Xlog:gc instead.")                              \
2309                                                                             \
2310   product(bool, PrintGCDetails, false,                                      \
2311           "Print more details at garbage collection. "                      \
2312           "Deprecated, use -Xlog:gc* instead.")                             \
2313                                                                             \
2314   develop(intx, ConcGCYieldTimeout, 0,                                      \
2315           "If non-zero, assert that GC threads yield within this "          \
2316           "number of milliseconds")                                         \
2317           range(0, max_intx)                                                \
2318                                                                             \
2319   develop(bool, TraceFinalizerRegistration, false,                          \
2320           "Trace registration of final references")                         \
2321                                                                             \
2322   notproduct(bool, TraceScavenge, false,                                    \
2323           "Trace scavenge")                                                 \
2324                                                                             \
2325   product(bool, IgnoreEmptyClassPaths, false,                               \
2326           "Ignore empty path elements in -classpath")                       \
2327                                                                             \
2328   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2329           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2330           "Initial size of the boot class loader data metaspace")           \
2331           range(30*K, max_uintx/BytesPerWord)                               \
2332           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2333                                                                             \
2334   product(bool, TraceYoungGenTime, false,                                   \
2335           "Trace accumulated time for young collection")                    \
2336                                                                             \
2337   product(bool, TraceOldGenTime, false,                                     \
2338           "Trace accumulated time for old collection")                      \
2339                                                                             \
2340   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2341           "Print heap layout in response to SIGBREAK")                      \
2342                                                                             \
2343   manageable(bool, PrintClassHistogram, false,                              \
2344           "Print a histogram of class instances")                           \
2345                                                                             \
2346   develop(bool, TraceGCTaskManager, false,                                  \
2347           "Trace actions of the GC task manager")                           \
2348                                                                             \
2349   develop(bool, TraceGCTaskQueue, false,                                    \
2350           "Trace actions of the GC task queues")                            \
2351                                                                             \
2352   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2353           "Trace marking phase in ParallelOldGC")                           \
2354                                                                             \
2355   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2356           "Trace dense prefix computation for ParallelOldGC")               \
2357                                                                             \
2358   develop(bool, IgnoreLibthreadGPFault, false,                              \
2359           "Suppress workaround for libthread GP fault")                     \
2360                                                                             \
2361   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2362           "The percentage of the used heap that the instances of a class "  \
2363           "must occupy for the class to generate a trace event")            \
2364           range(0.0, 100.0)                                                 \
2365                                                                             \
2366   /* JVMTI heap profiling */                                                \
2367                                                                             \
2368   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2369           "Trace JVMTI object tagging calls")                               \
2370                                                                             \
2371   diagnostic(bool, VerifyBeforeIteration, false,                            \
2372           "Verify memory system before JVMTI iteration")                    \
2373                                                                             \
2374   /* compiler interface */                                                  \
2375                                                                             \
2376   develop(bool, CIPrintCompilerName, false,                                 \
2377           "when CIPrint is active, print the name of the active compiler")  \
2378                                                                             \
2379   diagnostic(bool, CIPrintCompileQueue, false,                              \
2380           "display the contents of the compile queue whenever a "           \
2381           "compilation is enqueued")                                        \
2382                                                                             \
2383   develop(bool, CIPrintRequests, false,                                     \
2384           "display every request for compilation")                          \
2385                                                                             \
2386   product(bool, CITime, false,                                              \
2387           "collect timing information for compilation")                     \
2388                                                                             \
2389   develop(bool, CITimeVerbose, false,                                       \
2390           "be more verbose in compilation timings")                         \
2391                                                                             \
2392   develop(bool, CITimeEach, false,                                          \
2393           "display timing information after each successful compilation")   \
2394                                                                             \
2395   develop(bool, CICountOSR, false,                                          \
2396           "use a separate counter when assigning ids to osr compilations")  \
2397                                                                             \
2398   develop(bool, CICompileNatives, true,                                     \
2399           "compile native methods if supported by the compiler")            \
2400                                                                             \
2401   develop_pd(bool, CICompileOSR,                                            \
2402           "compile on stack replacement methods if supported by the "       \
2403           "compiler")                                                       \
2404                                                                             \
2405   develop(bool, CIPrintMethodCodes, false,                                  \
2406           "print method bytecodes of the compiled code")                    \
2407                                                                             \
2408   develop(bool, CIPrintTypeFlow, false,                                     \
2409           "print the results of ciTypeFlow analysis")                       \
2410                                                                             \
2411   develop(bool, CITraceTypeFlow, false,                                     \
2412           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2413                                                                             \
2414   develop(intx, OSROnlyBCI, -1,                                             \
2415           "OSR only at this bci.  Negative values mean exclude that bci")   \
2416                                                                             \
2417   /* compiler */                                                            \
2418                                                                             \
2419   /* notice: the max range value here is max_jint, not max_intx  */         \
2420   /* because of overflow issue                                   */         \
2421   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2422           "Number of compiler threads to run")                              \
2423           range(0, max_jint)                                                \
2424           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2425                                                                             \
2426   product(intx, CompilationPolicyChoice, 0,                                 \
2427           "which compilation policy (0-3)")                                 \
2428           range(0, 3)                                                       \
2429                                                                             \
2430   develop(bool, UseStackBanging, true,                                      \
2431           "use stack banging for stack overflow checks (required for "      \
2432           "proper StackOverflow handling; disable only to measure cost "    \
2433           "of stackbanging)")                                               \
2434                                                                             \
2435   develop(bool, UseStrictFP, true,                                          \
2436           "use strict fp if modifier strictfp is set")                      \
2437                                                                             \
2438   develop(bool, GenerateSynchronizationCode, true,                          \
2439           "generate locking/unlocking code for synchronized methods and "   \
2440           "monitors")                                                       \
2441                                                                             \
2442   develop(bool, GenerateRangeChecks, true,                                  \
2443           "Generate range checks for array accesses")                       \
2444                                                                             \
2445   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2446           "Generate code for implicit null checks")                         \
2447                                                                             \
2448   product_pd(bool, TrapBasedNullChecks,                                     \
2449           "Generate code for null checks that uses a cmp and trap "         \
2450           "instruction raising SIGTRAP.  This is only used if an access to" \
2451           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2452           "ImplicitNullChecks don't work (PPC64).")                         \
2453                                                                             \
2454   product(bool, PrintSafepointStatistics, false,                            \
2455           "Print statistics about safepoint synchronization")               \
2456                                                                             \
2457   product(intx, PrintSafepointStatisticsCount, 300,                         \
2458           "Total number of safepoint statistics collected "                 \
2459           "before printing them out")                                       \
2460           range(1, max_intx)                                                \
2461                                                                             \
2462   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2463           "Print safepoint statistics only when safepoint takes "           \
2464           "more than PrintSafepointSatisticsTimeout in millis")             \
2465   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2466   NOT_LP64(range(-1, max_intx))                                             \
2467                                                                             \
2468   product(bool, Inline, true,                                               \
2469           "Enable inlining")                                                \
2470                                                                             \
2471   product(bool, ClipInlining, true,                                         \
2472           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2473                                                                             \
2474   develop(bool, UseCHA, true,                                               \
2475           "Enable CHA")                                                     \
2476                                                                             \
2477   product(bool, UseTypeProfile, true,                                       \
2478           "Check interpreter profile for historically monomorphic calls")   \
2479                                                                             \
2480   diagnostic(bool, PrintInlining, false,                                    \
2481           "Print inlining optimizations")                                   \
2482                                                                             \
2483   product(bool, UsePopCountInstruction, false,                              \
2484           "Use population count instruction")                               \
2485                                                                             \
2486   develop(bool, EagerInitialization, false,                                 \
2487           "Eagerly initialize classes if possible")                         \
2488                                                                             \
2489   diagnostic(bool, LogTouchedMethods, false,                                \
2490           "Log methods which have been ever touched in runtime")            \
2491                                                                             \
2492   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2493           "Print all methods that have been ever touched in runtime")       \
2494                                                                             \
2495   develop(bool, TraceMethodReplacement, false,                              \
2496           "Print when methods are replaced do to recompilation")            \
2497                                                                             \
2498   develop(bool, PrintMethodFlushing, false,                                 \
2499           "Print the nmethods being flushed")                               \
2500                                                                             \
2501   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2502           "print statistics about method flushing")                         \
2503                                                                             \
2504   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2505           "Number of compiled code invocations after which "                \
2506           "the method is considered as hot by the flusher")                 \
2507           range(1, max_jint)                                                \
2508                                                                             \
2509   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2510           "Minimum number of sweeper passes before an nmethod "             \
2511           "can be flushed")                                                 \
2512           range(0, max_intx)                                                \
2513                                                                             \
2514   product(bool, UseCodeAging, true,                                         \
2515           "Insert counter to detect warm methods")                          \
2516                                                                             \
2517   diagnostic(bool, StressCodeAging, false,                                  \
2518           "Start with counters compiled in")                                \
2519                                                                             \
2520   develop(bool, StressCodeBuffers, false,                                   \
2521           "Exercise code buffer expansion and other rare state changes")    \
2522                                                                             \
2523   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2524           "Generate extra debugging information for non-safepoints in "     \
2525           "nmethods")                                                       \
2526                                                                             \
2527   product(bool, PrintVMOptions, false,                                      \
2528           "Print flags that appeared on the command line")                  \
2529                                                                             \
2530   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2531           "Ignore unrecognized VM options")                                 \
2532                                                                             \
2533   product(bool, PrintCommandLineFlags, false,                               \
2534           "Print flags specified on command line or set by ergonomics")     \
2535                                                                             \
2536   product(bool, PrintFlagsInitial, false,                                   \
2537           "Print all VM flags before argument processing and exit VM")      \
2538                                                                             \
2539   product(bool, PrintFlagsFinal, false,                                     \
2540           "Print all VM flags after argument and ergonomic processing")     \
2541                                                                             \
2542   notproduct(bool, PrintFlagsWithComments, false,                           \
2543           "Print all VM flags with default values and descriptions and "    \
2544           "exit")                                                           \
2545                                                                             \
2546   product(bool, PrintFlagsRanges, false,                                    \
2547           "Print VM flags and their ranges and exit VM")                    \
2548                                                                             \
2549   diagnostic(bool, SerializeVMOutput, true,                                 \
2550           "Use a mutex to serialize output to tty and LogFile")             \
2551                                                                             \
2552   diagnostic(bool, DisplayVMOutput, true,                                   \
2553           "Display all VM output on the tty, independently of LogVMOutput") \
2554                                                                             \
2555   diagnostic(bool, LogVMOutput, false,                                      \
2556           "Save VM output to LogFile")                                      \
2557                                                                             \
2558   diagnostic(ccstr, LogFile, NULL,                                          \
2559           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2560           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2561                                                                             \
2562   product(ccstr, ErrorFile, NULL,                                           \
2563           "If an error occurs, save the error data to this file "           \
2564           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2565                                                                             \
2566   product(bool, DisplayVMOutputToStderr, false,                             \
2567           "If DisplayVMOutput is true, display all VM output to stderr")    \
2568                                                                             \
2569   product(bool, DisplayVMOutputToStdout, false,                             \
2570           "If DisplayVMOutput is true, display all VM output to stdout")    \
2571                                                                             \
2572   product(bool, UseHeavyMonitors, false,                                    \
2573           "use heavyweight instead of lightweight Java monitors")           \
2574                                                                             \
2575   product(bool, PrintStringTableStatistics, false,                          \
2576           "print statistics about the StringTable and SymbolTable")         \
2577                                                                             \
2578   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2579           "verify StringTable contents at exit")                            \
2580                                                                             \
2581   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2582           "print histogram of the symbol table")                            \
2583                                                                             \
2584   notproduct(bool, ExitVMOnVerifyError, false,                              \
2585           "standard exit from VM if bytecode verify error "                 \
2586           "(only in debug mode)")                                           \
2587                                                                             \
2588   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2589           "Call fatal if this exception is thrown.  Example: "              \
2590           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2591                                                                             \
2592   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2593           "Call fatal if the exception pointed by AbortVMOnException "      \
2594           "has this message")                                               \
2595                                                                             \
2596   develop(bool, DebugVtables, false,                                        \
2597           "add debugging code to vtable dispatch")                          \
2598                                                                             \
2599   notproduct(bool, PrintVtableStats, false,                                 \
2600           "print vtables stats at end of run")                              \
2601                                                                             \
2602   develop(bool, TraceCreateZombies, false,                                  \
2603           "trace creation of zombie nmethods")                              \
2604                                                                             \
2605   notproduct(bool, IgnoreLockingAssertions, false,                          \
2606           "disable locking assertions (for speed)")                         \
2607                                                                             \
2608   product(bool, RangeCheckElimination, true,                                \
2609           "Eliminate range checks")                                         \
2610                                                                             \
2611   develop_pd(bool, UncommonNullCast,                                        \
2612           "track occurrences of null in casts; adjust compiler tactics")    \
2613                                                                             \
2614   develop(bool, TypeProfileCasts,  true,                                    \
2615           "treat casts like calls for purposes of type profiling")          \
2616                                                                             \
2617   develop(bool, DelayCompilationDuringStartup, true,                        \
2618           "Delay invoking the compiler until main application class is "    \
2619           "loaded")                                                         \
2620                                                                             \
2621   develop(bool, CompileTheWorld, false,                                     \
2622           "Compile all methods in all classes in bootstrap class path "     \
2623             "(stress test)")                                                \
2624                                                                             \
2625   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2626           "Preload all classes used by a class before start loading")       \
2627                                                                             \
2628   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2629           "Force a safepoint every n compiles so sweeper can keep up")      \
2630                                                                             \
2631   develop(bool, FillDelaySlots, true,                                       \
2632           "Fill delay slots (on SPARC only)")                               \
2633                                                                             \
2634   develop(bool, TimeLivenessAnalysis, false,                                \
2635           "Time computation of bytecode liveness analysis")                 \
2636                                                                             \
2637   develop(bool, TraceLivenessGen, false,                                    \
2638           "Trace the generation of liveness analysis information")          \
2639                                                                             \
2640   notproduct(bool, TraceLivenessQuery, false,                               \
2641           "Trace queries of liveness analysis information")                 \
2642                                                                             \
2643   notproduct(bool, CollectIndexSetStatistics, false,                        \
2644           "Collect information about IndexSets")                            \
2645                                                                             \
2646   develop(bool, UseLoopSafepoints, true,                                    \
2647           "Generate Safepoint nodes in every loop")                         \
2648                                                                             \
2649   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2650           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2651           "Inline allocations larger than this in doublewords must go slow")\
2652                                                                             \
2653   product(bool, AggressiveOpts, false,                                      \
2654           "Enable aggressive optimizations - see arguments.cpp")            \
2655                                                                             \
2656   product_pd(bool, CompactStrings,                                          \
2657           "Enable Strings to use single byte chars in backing store")       \
2658                                                                             \
2659   product_pd(uintx, TypeProfileLevel,                                       \
2660           "=XYZ, with Z: Type profiling of arguments at call; "             \
2661                      "Y: Type profiling of return value at call; "          \
2662                      "X: Type profiling of parameters to methods; "         \
2663           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2664           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2665                                                                             \
2666   product(intx, TypeProfileArgsLimit,     2,                                \
2667           "max number of call arguments to consider for type profiling")    \
2668           range(0, 16)                                                      \
2669                                                                             \
2670   product(intx, TypeProfileParmsLimit,    2,                                \
2671           "max number of incoming parameters to consider for type profiling"\
2672           ", -1 for all")                                                   \
2673           range(-1, 64)                                                     \
2674                                                                             \
2675   /* statistics */                                                          \
2676   develop(bool, CountCompiledCalls, false,                                  \
2677           "Count method invocations")                                       \
2678                                                                             \
2679   notproduct(bool, CountRuntimeCalls, false,                                \
2680           "Count VM runtime calls")                                         \
2681                                                                             \
2682   develop(bool, CountJNICalls, false,                                       \
2683           "Count jni method invocations")                                   \
2684                                                                             \
2685   notproduct(bool, CountJVMCalls, false,                                    \
2686           "Count jvm method invocations")                                   \
2687                                                                             \
2688   notproduct(bool, CountRemovableExceptions, false,                         \
2689           "Count exceptions that could be replaced by branches due to "     \
2690           "inlining")                                                       \
2691                                                                             \
2692   notproduct(bool, ICMissHistogram, false,                                  \
2693           "Produce histogram of IC misses")                                 \
2694                                                                             \
2695   /* interpreter */                                                         \
2696   product_pd(bool, RewriteBytecodes,                                        \
2697           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2698                                                                             \
2699   product_pd(bool, RewriteFrequentPairs,                                    \
2700           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2701                                                                             \
2702   diagnostic(bool, PrintInterpreter, false,                                 \
2703           "Print the generated interpreter code")                           \
2704                                                                             \
2705   product(bool, UseInterpreter, true,                                       \
2706           "Use interpreter for non-compiled methods")                       \
2707                                                                             \
2708   develop(bool, UseFastSignatureHandlers, true,                             \
2709           "Use fast signature handlers for native calls")                   \
2710                                                                             \
2711   product(bool, UseLoopCounter, true,                                       \
2712           "Increment invocation counter on backward branch")                \
2713                                                                             \
2714   product_pd(bool, UseOnStackReplacement,                                   \
2715           "Use on stack replacement, calls runtime if invoc. counter "      \
2716           "overflows in loop")                                              \
2717                                                                             \
2718   notproduct(bool, TraceOnStackReplacement, false,                          \
2719           "Trace on stack replacement")                                     \
2720                                                                             \
2721   product_pd(bool, PreferInterpreterNativeStubs,                            \
2722           "Use always interpreter stubs for native methods invoked via "    \
2723           "interpreter")                                                    \
2724                                                                             \
2725   develop(bool, CountBytecodes, false,                                      \
2726           "Count number of bytecodes executed")                             \
2727                                                                             \
2728   develop(bool, PrintBytecodeHistogram, false,                              \
2729           "Print histogram of the executed bytecodes")                      \
2730                                                                             \
2731   develop(bool, PrintBytecodePairHistogram, false,                          \
2732           "Print histogram of the executed bytecode pairs")                 \
2733                                                                             \
2734   diagnostic(bool, PrintSignatureHandlers, false,                           \
2735           "Print code generated for native method signature handlers")      \
2736                                                                             \
2737   develop(bool, VerifyOops, false,                                          \
2738           "Do plausibility checks for oops")                                \
2739                                                                             \
2740   develop(bool, CheckUnhandledOops, false,                                  \
2741           "Check for unhandled oops in VM code")                            \
2742                                                                             \
2743   develop(bool, VerifyJNIFields, trueInDebug,                               \
2744           "Verify jfieldIDs for instance fields")                           \
2745                                                                             \
2746   notproduct(bool, VerifyJNIEnvThread, false,                               \
2747           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2748           "from JNI")                                                       \
2749                                                                             \
2750   develop(bool, VerifyFPU, false,                                           \
2751           "Verify FPU state (check for NaN's, etc.)")                       \
2752                                                                             \
2753   develop(bool, VerifyThread, false,                                        \
2754           "Watch the thread register for corruption (SPARC only)")          \
2755                                                                             \
2756   develop(bool, VerifyActivationFrameSize, false,                           \
2757           "Verify that activation frame didn't become smaller than its "    \
2758           "minimal size")                                                   \
2759                                                                             \
2760   develop(bool, TraceFrequencyInlining, false,                              \
2761           "Trace frequency based inlining")                                 \
2762                                                                             \
2763   develop_pd(bool, InlineIntrinsics,                                        \
2764           "Inline intrinsics that can be statically resolved")              \
2765                                                                             \
2766   product_pd(bool, ProfileInterpreter,                                      \
2767           "Profile at the bytecode level during interpretation")            \
2768                                                                             \
2769   develop(bool, TraceProfileInterpreter, false,                             \
2770           "Trace profiling at the bytecode level during interpretation. "   \
2771           "This outputs the profiling information collected to improve "    \
2772           "jit compilation.")                                               \
2773                                                                             \
2774   develop_pd(bool, ProfileTraps,                                            \
2775           "Profile deoptimization traps at the bytecode level")             \
2776                                                                             \
2777   product(intx, ProfileMaturityPercentage, 20,                              \
2778           "number of method invocations/branches (expressed as % of "       \
2779           "CompileThreshold) before using the method's profile")            \
2780           range(0, 100)                                                     \
2781                                                                             \
2782   diagnostic(bool, PrintMethodData, false,                                  \
2783           "Print the results of +ProfileInterpreter at end of run")         \
2784                                                                             \
2785   develop(bool, VerifyDataPointer, trueInDebug,                             \
2786           "Verify the method data pointer during interpreter profiling")    \
2787                                                                             \
2788   develop(bool, VerifyCompiledCode, false,                                  \
2789           "Include miscellaneous runtime verifications in nmethod code; "   \
2790           "default off because it disturbs nmethod size heuristics")        \
2791                                                                             \
2792   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2793           "Manually make GC thread crash then dump java stack trace;  "     \
2794           "Test only")                                                      \
2795                                                                             \
2796   /* compilation */                                                         \
2797   product(bool, UseCompiler, true,                                          \
2798           "Use Just-In-Time compilation")                                   \
2799                                                                             \
2800   develop(bool, TraceCompilationPolicy, false,                              \
2801           "Trace compilation policy")                                       \
2802                                                                             \
2803   develop(bool, TimeCompilationPolicy, false,                               \
2804           "Time the compilation policy")                                    \
2805                                                                             \
2806   product(bool, UseCounterDecay, true,                                      \
2807           "Adjust recompilation counters")                                  \
2808                                                                             \
2809   develop(intx, CounterHalfLifeTime,    30,                                 \
2810           "Half-life time of invocation counters (in seconds)")             \
2811                                                                             \
2812   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2813           "The minimum interval (in milliseconds) between invocation of "   \
2814           "CounterDecay")                                                   \
2815                                                                             \
2816   product(bool, AlwaysCompileLoopMethods, false,                            \
2817           "When using recompilation, never interpret methods "              \
2818           "containing loops")                                               \
2819                                                                             \
2820   product(bool, DontCompileHugeMethods, true,                               \
2821           "Do not compile methods > HugeMethodLimit")                       \
2822                                                                             \
2823   /* Bytecode escape analysis estimation. */                                \
2824   product(bool, EstimateArgEscape, true,                                    \
2825           "Analyze bytecodes to estimate escape state of arguments")        \
2826                                                                             \
2827   product(intx, BCEATraceLevel, 0,                                          \
2828           "How much tracing to do of bytecode escape analysis estimates "   \
2829           "(0-3)")                                                          \
2830           range(0, 3)                                                       \
2831                                                                             \
2832   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2833           "Maximum number of nested calls that are analyzed by BC EA")      \
2834           range(0, max_jint)                                                \
2835                                                                             \
2836   product(intx, MaxBCEAEstimateSize, 150,                                   \
2837           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2838           range(0, max_jint)                                                \
2839                                                                             \
2840   product(intx,  AllocatePrefetchStyle, 1,                                  \
2841           "0 = no prefetch, "                                               \
2842           "1 = generate prefetch instructions for each allocation, "        \
2843           "2 = use TLAB watermark to gate allocation prefetch, "            \
2844           "3 = generate one prefetch instruction per cache line")           \
2845           range(0, 3)                                                       \
2846                                                                             \
2847   product(intx,  AllocatePrefetchDistance, -1,                              \
2848           "Distance to prefetch ahead of allocation pointer. "              \
2849           "-1: use system-specific value (automatically determined")        \
2850           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2851                                                                             \
2852   product(intx,  AllocatePrefetchLines, 3,                                  \
2853           "Number of lines to prefetch ahead of array allocation pointer")  \
2854           range(1, 64)                                                      \
2855                                                                             \
2856   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2857           "Number of lines to prefetch ahead of instance allocation "       \
2858           "pointer")                                                        \
2859           range(1, 64)                                                      \
2860                                                                             \
2861   product(intx,  AllocatePrefetchStepSize, 16,                              \
2862           "Step size in bytes of sequential prefetch instructions")         \
2863           range(1, 512)                                                     \
2864           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2865                                                                             \
2866   product(intx,  AllocatePrefetchInstr, 0,                                  \
2867           "Select instruction to prefetch ahead of allocation pointer")     \
2868           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2869                                                                             \
2870   /* deoptimization */                                                      \
2871   develop(bool, TraceDeoptimization, false,                                 \
2872           "Trace deoptimization")                                           \
2873                                                                             \
2874   develop(bool, PrintDeoptimizationDetails, false,                          \
2875           "Print more information about deoptimization")                    \
2876                                                                             \
2877   develop(bool, DebugDeoptimization, false,                                 \
2878           "Tracing various information while debugging deoptimization")     \
2879                                                                             \
2880   product(intx, SelfDestructTimer, 0,                                       \
2881           "Will cause VM to terminate after a given time (in minutes) "     \
2882           "(0 means off)")                                                  \
2883           range(0, max_intx)                                                \
2884                                                                             \
2885   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2886           "The maximum number of lines in the stack trace for Java "        \
2887           "exceptions (0 means all)")                                       \
2888           range(0, max_jint/2)                                              \
2889                                                                             \
2890   /* notice: the max range value here is max_jint, not max_intx  */         \
2891   /* because of overflow issue                                   */         \
2892   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2893           "Guarantee a safepoint (at least) every so many milliseconds "    \
2894           "(0 means none)")                                                 \
2895           range(0, max_jint)                                                \
2896                                                                             \
2897   product(intx, SafepointTimeoutDelay, 10000,                               \
2898           "Delay in milliseconds for option SafepointTimeout")              \
2899   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2900   NOT_LP64(range(0, max_intx))                                              \
2901                                                                             \
2902   product(intx, NmethodSweepActivity, 10,                                   \
2903           "Removes cold nmethods from code cache if > 0. Higher values "    \
2904           "result in more aggressive sweeping")                             \
2905           range(0, 2000)                                                    \
2906                                                                             \
2907   notproduct(bool, LogSweeper, false,                                       \
2908           "Keep a ring buffer of sweeper activity")                         \
2909                                                                             \
2910   notproduct(intx, SweeperLogEntries, 1024,                                 \
2911           "Number of records in the ring buffer of sweeper activity")       \
2912                                                                             \
2913   notproduct(intx, MemProfilingInterval, 500,                               \
2914           "Time between each invocation of the MemProfiler")                \
2915                                                                             \
2916   develop(intx, MallocCatchPtr, -1,                                         \
2917           "Hit breakpoint when mallocing/freeing this pointer")             \
2918                                                                             \
2919   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2920           "List of assertions (file:line) to muzzle")                       \
2921                                                                             \
2922   develop(intx, StackPrintLimit, 100,                                       \
2923           "number of stack frames to print in VM-level stack dump")         \
2924                                                                             \
2925   notproduct(intx, MaxElementPrintSize, 256,                                \
2926           "maximum number of elements to print")                            \
2927                                                                             \
2928   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2929           "maximum number of subklasses to print when printing klass")      \
2930                                                                             \
2931   product(intx, MaxInlineLevel, 9,                                          \
2932           "maximum number of nested calls that are inlined")                \
2933           range(0, max_jint)                                                \
2934                                                                             \
2935   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2936           "maximum number of nested recursive calls that are inlined")      \
2937           range(0, max_jint)                                                \
2938                                                                             \
2939   develop(intx, MaxForceInlineLevel, 100,                                   \
2940           "maximum number of nested calls that are forced for inlining "    \
2941           "(using CompileCommand or marked w/ @ForceInline)")               \
2942           range(0, max_jint)                                                \
2943                                                                             \
2944   product_pd(intx, InlineSmallCode,                                         \
2945           "Only inline already compiled methods if their code size is "     \
2946           "less than this")                                                 \
2947           range(0, max_jint)                                                \
2948                                                                             \
2949   product(intx, MaxInlineSize, 35,                                          \
2950           "The maximum bytecode size of a method to be inlined")            \
2951           range(0, max_jint)                                                \
2952                                                                             \
2953   product_pd(intx, FreqInlineSize,                                          \
2954           "The maximum bytecode size of a frequent method to be inlined")   \
2955           range(0, max_jint)                                                \
2956                                                                             \
2957   product(intx, MaxTrivialSize, 6,                                          \
2958           "The maximum bytecode size of a trivial method to be inlined")    \
2959           range(0, max_jint)                                                \
2960                                                                             \
2961   product(intx, MinInliningThreshold, 250,                                  \
2962           "The minimum invocation count a method needs to have to be "      \
2963           "inlined")                                                        \
2964           range(0, max_jint)                                                \
2965                                                                             \
2966   develop(intx, MethodHistogramCutoff, 100,                                 \
2967           "The cutoff value for method invocation histogram (+CountCalls)") \
2968                                                                             \
2969   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2970           "Number of interpreted methods to show in profile")               \
2971                                                                             \
2972   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2973           "Number of compiled methods to show in profile")                  \
2974                                                                             \
2975   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2976           "Number of stub methods to show in profile")                      \
2977                                                                             \
2978   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2979           "Number of runtime stub nodes to show in profile")                \
2980                                                                             \
2981   product(intx, ProfileIntervalsTicks, 100,                                 \
2982           "Number of ticks between printing of interval profile "           \
2983           "(+ProfileIntervals)")                                            \
2984           range(0, max_intx)                                                \
2985                                                                             \
2986   notproduct(intx, ScavengeALotInterval,     1,                             \
2987           "Interval between which scavenge will occur with +ScavengeALot")  \
2988                                                                             \
2989   notproduct(intx, FullGCALotInterval,     1,                               \
2990           "Interval between which full gc will occur with +FullGCALot")     \
2991                                                                             \
2992   notproduct(intx, FullGCALotStart,     0,                                  \
2993           "For which invocation to start FullGCAlot")                       \
2994                                                                             \
2995   notproduct(intx, FullGCALotDummies,  32*K,                                \
2996           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2997           "to move")                                                        \
2998                                                                             \
2999   develop(intx, DontYieldALotInterval,    10,                               \
3000           "Interval between which yields will be dropped (milliseconds)")   \
3001                                                                             \
3002   develop(intx, ProfilerPCTickThreshold,    15,                             \
3003           "Number of ticks in a PC buckets to be a hotspot")                \
3004                                                                             \
3005   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3006           "Number of exits until DeoptimizeALot kicks in")                  \
3007                                                                             \
3008   notproduct(intx, ZombieALotInterval,     5,                               \
3009           "Number of exits until ZombieALot kicks in")                      \
3010                                                                             \
3011   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3012           "If non-zero, maximum number of words that malloc/realloc can "   \
3013           "allocate (for testing only)")                                    \
3014           range(0, max_uintx)                                               \
3015                                                                             \
3016   product(intx, TypeProfileWidth, 2,                                        \
3017           "Number of receiver types to record in call/cast profile")        \
3018           range(0, 8)                                                       \
3019                                                                             \
3020   develop(intx, BciProfileWidth,      2,                                    \
3021           "Number of return bci's to record in ret profile")                \
3022                                                                             \
3023   product(intx, PerMethodRecompilationCutoff, 400,                          \
3024           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3025           range(-1, max_intx)                                               \
3026                                                                             \
3027   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3028           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3029           range(-1, max_intx)                                               \
3030                                                                             \
3031   product(intx, PerMethodTrapLimit,  100,                                   \
3032           "Limit on traps (of one kind) in a method (includes inlines)")    \
3033           range(0, max_jint)                                                \
3034                                                                             \
3035   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3036           "Limit on speculative traps (of one kind) in a method "           \
3037           "(includes inlines)")                                             \
3038           range(0, max_jint)                                                \
3039                                                                             \
3040   product(intx, PerBytecodeTrapLimit,  4,                                   \
3041           "Limit on traps (of one kind) at a particular BCI")               \
3042           range(0, max_jint)                                                \
3043                                                                             \
3044   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3045           "Extra method data trap entries for speculation")                 \
3046                                                                             \
3047   develop(intx, InlineFrequencyRatio,    20,                                \
3048           "Ratio of call site execution to caller method invocation")       \
3049           range(0, max_jint)                                                \
3050                                                                             \
3051   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3052           "Count of call site execution necessary to trigger frequent "     \
3053           "inlining")                                                       \
3054           range(0, max_jint)                                                \
3055                                                                             \
3056   develop(intx, InlineThrowCount,    50,                                    \
3057           "Force inlining of interpreted methods that throw this often")    \
3058           range(0, max_jint)                                                \
3059                                                                             \
3060   develop(intx, InlineThrowMaxSize,   200,                                  \
3061           "Force inlining of throwing methods smaller than this")           \
3062           range(0, max_jint)                                                \
3063                                                                             \
3064   develop(intx, ProfilerNodeSize,  1024,                                    \
3065           "Size in K to allocate for the Profile Nodes of each thread")     \
3066           range(0, 1024)                                                    \
3067                                                                             \
3068   /* gc parameters */                                                       \
3069   product(size_t, InitialHeapSize, 0,                                       \
3070           "Initial heap size (in bytes); zero means use ergonomics")        \
3071           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3072                                                                             \
3073   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3074           "Maximum heap size (in bytes)")                                   \
3075           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3076                                                                             \
3077   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3078           "Initial tenured generation size (in bytes)")                     \
3079           range(0, max_uintx)                                               \
3080                                                                             \
3081   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3082           "Initial new generation size (in bytes)")                         \
3083           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3084                                                                             \
3085   product(size_t, MaxNewSize, max_uintx,                                    \
3086           "Maximum new generation size (in bytes), max_uintx means set "    \
3087           "ergonomically")                                                  \
3088           range(0, max_uintx)                                               \
3089                                                                             \
3090   product_pd(size_t, HeapBaseMinAddress,                                    \
3091           "OS specific low limit for heap base address")                    \
3092           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3093                                                                             \
3094   product(size_t, PretenureSizeThreshold, 0,                                \
3095           "Maximum size in bytes of objects allocated in DefNew "           \
3096           "generation; zero means no maximum")                              \
3097           range(0, max_uintx)                                               \
3098                                                                             \
3099   product(size_t, MinTLABSize, 2*K,                                         \
3100           "Minimum allowed TLAB size (in bytes)")                           \
3101           range(1, max_uintx/2)                                             \
3102           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3103                                                                             \
3104   product(size_t, TLABSize, 0,                                              \
3105           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3106           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3107                                                                             \
3108   product(size_t, YoungPLABSize, 4096,                                      \
3109           "Size of young gen promotion LAB's (in HeapWords)")               \
3110           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3111                                                                             \
3112   product(size_t, OldPLABSize, 1024,                                        \
3113           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3114           "of blocks to attempt to claim when refilling CMS LAB's")         \
3115           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3116                                                                             \
3117   product(uintx, TLABAllocationWeight, 35,                                  \
3118           "Allocation averaging weight")                                    \
3119           range(0, 100)                                                     \
3120                                                                             \
3121   /* Limit the lower bound of this flag to 1 as it is used  */              \
3122   /* in a division expression.                              */              \
3123   product(uintx, TLABWasteTargetPercent, 1,                                 \
3124           "Percentage of Eden that can be wasted")                          \
3125           range(1, 100)                                                     \
3126                                                                             \
3127   product(uintx, TLABRefillWasteFraction,    64,                            \
3128           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3129           range(1, max_juint)                                               \
3130                                                                             \
3131   product(uintx, TLABWasteIncrement,    4,                                  \
3132           "Increment allowed waste at slow allocation")                     \
3133           range(0, max_jint)                                                \
3134           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3135                                                                             \
3136   product(uintx, SurvivorRatio, 8,                                          \
3137           "Ratio of eden/survivor space size")                              \
3138           range(1, max_uintx-2)                                             \
3139           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3140                                                                             \
3141   product(uintx, NewRatio, 2,                                               \
3142           "Ratio of old/new generation sizes")                              \
3143           range(0, max_uintx-1)                                             \
3144                                                                             \
3145   product_pd(size_t, NewSizeThreadIncrease,                                 \
3146           "Additional size added to desired new generation size per "       \
3147           "non-daemon thread (in bytes)")                                   \
3148           range(0, max_uintx)                                               \
3149                                                                             \
3150   product_pd(size_t, MetaspaceSize,                                         \
3151           "Initial threshold (in bytes) at which a garbage collection "     \
3152           "is done to reduce Metaspace usage")                              \
3153           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3154                                                                             \
3155   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3156           "Maximum size of Metaspaces (in bytes)")                          \
3157           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3158                                                                             \
3159   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3160           "Maximum size of class area in Metaspace when compressed "        \
3161           "class pointers are used")                                        \
3162           range(1*M, 3*G)                                                   \
3163                                                                             \
3164   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3165           "The minimum percentage of heap free after GC to avoid expansion."\
3166           " For most GCs this applies to the old generation. In G1 and"     \
3167           " ParallelGC it applies to the whole heap.")                      \
3168           range(0, 100)                                                     \
3169           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3170                                                                             \
3171   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3172           "The maximum percentage of heap free after GC to avoid shrinking."\
3173           " For most GCs this applies to the old generation. In G1 and"     \
3174           " ParallelGC it applies to the whole heap.")                      \
3175           range(0, 100)                                                     \
3176           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3177                                                                             \
3178   product(bool, ShrinkHeapInSteps, true,                                    \
3179           "When disabled, informs the GC to shrink the java heap directly"  \
3180           " to the target size at the next full GC rather than requiring"   \
3181           " smaller steps during multiple full GCs.")                       \
3182                                                                             \
3183   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3184           "Number of milliseconds per MB of free space in the heap")        \
3185           range(0, max_intx)                                                \
3186           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3187                                                                             \
3188   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3189           "The minimum change in heap space due to GC (in bytes)")          \
3190           range(0, max_uintx)                                               \
3191                                                                             \
3192   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3193           "The minimum expansion of Metaspace (in bytes)")                  \
3194           range(0, max_uintx)                                               \
3195                                                                             \
3196   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3197           "The maximum percentage of Metaspace free after GC to avoid "     \
3198           "shrinking")                                                      \
3199           range(0, 100)                                                     \
3200           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3201                                                                             \
3202   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3203           "The minimum percentage of Metaspace free after GC to avoid "     \
3204           "expansion")                                                      \
3205           range(0, 99)                                                      \
3206           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3207                                                                             \
3208   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3209           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3210           range(0, max_uintx)                                               \
3211                                                                             \
3212   product(uintx, QueuedAllocationWarningCount, 0,                           \
3213           "Number of times an allocation that queues behind a GC "          \
3214           "will retry before printing a warning")                           \
3215           range(0, max_uintx)                                               \
3216                                                                             \
3217   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3218           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3219           range(0, max_uintx)                                               \
3220                                                                             \
3221   diagnostic(intx, VerifyGCLevel,     0,                                    \
3222           "Generation level at which to start +VerifyBefore/AfterGC")       \
3223           range(0, 1)                                                       \
3224                                                                             \
3225   product(uintx, MaxTenuringThreshold,    15,                               \
3226           "Maximum value for tenuring threshold")                           \
3227           range(0, markOopDesc::max_age + 1)                                \
3228           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3229                                                                             \
3230   product(uintx, InitialTenuringThreshold,    7,                            \
3231           "Initial value for tenuring threshold")                           \
3232           range(0, markOopDesc::max_age + 1)                                \
3233           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3234                                                                             \
3235   product(uintx, TargetSurvivorRatio,    50,                                \
3236           "Desired percentage of survivor space used after scavenge")       \
3237           range(0, 100)                                                     \
3238                                                                             \
3239   product(uintx, MarkSweepDeadRatio,     5,                                 \
3240           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3241           "Serial mark sweep treats this as both the minimum and maximum "  \
3242           "value. "                                                         \
3243           "CMS uses this value only if it falls back to mark sweep. "       \
3244           "Par compact uses a variable scale based on the density of the "  \
3245           "generation and treats this as the maximum value when the heap "  \
3246           "is either completely full or completely empty.  Par compact "    \
3247           "also has a smaller default value; see arguments.cpp.")           \
3248           range(0, 100)                                                     \
3249                                                                             \
3250   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3251           "How often should we fully compact the heap (ignoring the dead "  \
3252           "space parameters)")                                              \
3253           range(1, max_juint)                                               \
3254                                                                             \
3255   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3256           "Delay between expansion and allocation (in milliseconds)")       \
3257                                                                             \
3258   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3259           "Delay in scheduling GC workers (in milliseconds)")               \
3260                                                                             \
3261   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3262           "(Unstable) Number of times to iterate in safepoint loop "        \
3263           "before blocking VM threads ")                                    \
3264           range(-1, max_jint-1)                                             \
3265                                                                             \
3266   product(intx, DeferPollingPageLoopCount,     -1,                          \
3267           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3268           "before changing safepoint polling page to RO ")                  \
3269           range(-1, max_jint-1)                                             \
3270                                                                             \
3271   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3272           range(0, max_intx)                                                \
3273                                                                             \
3274   product(bool, PSChunkLargeArrays, true,                                   \
3275           "Process large arrays in chunks")                                 \
3276                                                                             \
3277   product(uintx, GCDrainStackTargetSize, 64,                                \
3278           "Number of entries we will try to leave on the stack "            \
3279           "during parallel gc")                                             \
3280           range(0, max_juint)                                               \
3281                                                                             \
3282   /* stack parameters */                                                    \
3283   product_pd(intx, StackYellowPages,                                        \
3284           "Number of yellow zone (recoverable overflows) pages of size "    \
3285           "4KB. If pages are bigger yellow zone is aligned up.")            \
3286           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3287                                                                             \
3288   product_pd(intx, StackRedPages,                                           \
3289           "Number of red zone (unrecoverable overflows) pages of size "     \
3290           "4KB. If pages are bigger red zone is aligned up.")               \
3291           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3292                                                                             \
3293   product_pd(intx, StackReservedPages,                                      \
3294           "Number of reserved zone (reserved to annotated methods) pages"   \
3295           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3296           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3297                                                                             \
3298   product(bool, RestrictReservedStack, true,                                \
3299           "Restrict @ReservedStackAccess to trusted classes")               \
3300                                                                             \
3301   /* greater stack shadow pages can't generate instruction to bang stack */ \
3302   product_pd(intx, StackShadowPages,                                        \
3303           "Number of shadow zone (for overflow checking) pages of size "    \
3304           "4KB. If pages are bigger shadow zone is aligned up. "            \
3305           "This should exceed the depth of the VM and native call stack.")  \
3306           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3307                                                                             \
3308   product_pd(intx, ThreadStackSize,                                         \
3309           "Thread Stack Size (in Kbytes)")                                  \
3310           range(0, 1 * M)                                                   \
3311                                                                             \
3312   product_pd(intx, VMThreadStackSize,                                       \
3313           "Non-Java Thread Stack Size (in Kbytes)")                         \
3314           range(0, max_intx/(1 * K))                                        \
3315                                                                             \
3316   product_pd(intx, CompilerThreadStackSize,                                 \
3317           "Compiler Thread Stack Size (in Kbytes)")                         \
3318           range(0, max_intx/(1 * K))                                        \
3319                                                                             \
3320   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3321           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3322                                                                             \
3323   /* code cache parameters                                    */            \
3324   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3325           "Code cache segment size (in bytes) - smallest unit of "          \
3326           "allocation")                                                     \
3327           range(1, 1024)                                                    \
3328           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3329                                                                             \
3330   develop_pd(intx, CodeEntryAlignment,                                      \
3331           "Code entry alignment for generated code (in bytes)")             \
3332           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3333                                                                             \
3334   product_pd(intx, OptoLoopAlignment,                                       \
3335           "Align inner loops to zero relative to this modulus")             \
3336           range(1, 16)                                                      \
3337           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3338                                                                             \
3339   product_pd(uintx, InitialCodeCacheSize,                                   \
3340           "Initial code cache size (in bytes)")                             \
3341           range(0, max_uintx)                                               \
3342                                                                             \
3343   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3344           "Minimum code cache size (in bytes) required to start VM.")       \
3345           range(0, max_uintx)                                               \
3346                                                                             \
3347   product(bool, SegmentedCodeCache, false,                                  \
3348           "Use a segmented code cache")                                     \
3349                                                                             \
3350   product_pd(uintx, ReservedCodeCacheSize,                                  \
3351           "Reserved code cache size (in bytes) - maximum code cache size")  \
3352           range(0, max_uintx)                                               \
3353                                                                             \
3354   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3355           "Size of code heap with non-profiled methods (in bytes)")         \
3356           range(0, max_uintx)                                               \
3357                                                                             \
3358   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3359           "Size of code heap with profiled methods (in bytes)")             \
3360           range(0, max_uintx)                                               \
3361                                                                             \
3362   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3363           "Size of code heap with non-nmethods (in bytes)")                 \
3364           range(0, max_uintx)                                               \
3365                                                                             \
3366   product_pd(uintx, CodeCacheExpansionSize,                                 \
3367           "Code cache expansion size (in bytes)")                           \
3368           range(0, max_uintx)                                               \
3369                                                                             \
3370   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3371           "Minimum number of segments in a code cache block")               \
3372           range(1, 100)                                                     \
3373                                                                             \
3374   notproduct(bool, ExitOnFullCodeCache, false,                              \
3375           "Exit the VM if we fill the code cache")                          \
3376                                                                             \
3377   product(bool, UseCodeCacheFlushing, true,                                 \
3378           "Remove cold/old nmethods from the code cache")                   \
3379                                                                             \
3380   product(uintx, StartAggressiveSweepingAt, 10,                             \
3381           "Start aggressive sweeping if X[%] of the code cache is free."    \
3382           "Segmented code cache: X[%] of the non-profiled heap."            \
3383           "Non-segmented code cache: X[%] of the total code cache")         \
3384           range(0, 100)                                                     \
3385                                                                             \
3386   /* AOT parameters */                                                      \
3387   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3388           "Use AOT compiled files")                                         \
3389                                                                             \
3390   product(ccstrlist, AOTLibrary, NULL,                                      \
3391           "AOT library")                                                    \
3392                                                                             \
3393   product(bool, PrintAOT, false,                                            \
3394           "Print used AOT klasses and methods")                             \
3395                                                                             \
3396   notproduct(bool, PrintAOTStatistics, false,                               \
3397           "Print AOT statistics")                                           \
3398                                                                             \
3399   diagnostic(bool, UseAOTStrictLoading, false,                              \
3400           "Exit the VM if any of the AOT libraries has invalid config")     \
3401                                                                             \
3402   product(bool, CalculateClassFingerprint, false,                           \
3403           "Calculate class fingerprint")                                    \
3404                                                                             \
3405   /* interpreter debugging */                                               \
3406   develop(intx, BinarySwitchThreshold, 5,                                   \
3407           "Minimal number of lookupswitch entries for rewriting to binary " \
3408           "switch")                                                         \
3409                                                                             \
3410   develop(intx, StopInterpreterAt, 0,                                       \
3411           "Stop interpreter execution at specified bytecode number")        \
3412                                                                             \
3413   develop(intx, TraceBytecodesAt, 0,                                        \
3414           "Trace bytecodes starting with specified bytecode number")        \
3415                                                                             \
3416   /* compiler interface */                                                  \
3417   develop(intx, CIStart, 0,                                                 \
3418           "The id of the first compilation to permit")                      \
3419                                                                             \
3420   develop(intx, CIStop, max_jint,                                           \
3421           "The id of the last compilation to permit")                       \
3422                                                                             \
3423   develop(intx, CIStartOSR, 0,                                              \
3424           "The id of the first osr compilation to permit "                  \
3425           "(CICountOSR must be on)")                                        \
3426                                                                             \
3427   develop(intx, CIStopOSR, max_jint,                                        \
3428           "The id of the last osr compilation to permit "                   \
3429           "(CICountOSR must be on)")                                        \
3430                                                                             \
3431   develop(intx, CIBreakAtOSR, -1,                                           \
3432           "The id of osr compilation to break at")                          \
3433                                                                             \
3434   develop(intx, CIBreakAt, -1,                                              \
3435           "The id of compilation to break at")                              \
3436                                                                             \
3437   product(ccstrlist, CompileOnly, "",                                       \
3438           "List of methods (pkg/class.name) to restrict compilation to")    \
3439                                                                             \
3440   product(ccstr, CompileCommandFile, NULL,                                  \
3441           "Read compiler commands from this file [.hotspot_compiler]")      \
3442                                                                             \
3443   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3444           "Read compiler directives from this file")                        \
3445                                                                             \
3446   product(ccstrlist, CompileCommand, "",                                    \
3447           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3448                                                                             \
3449   develop(bool, ReplayCompiles, false,                                      \
3450           "Enable replay of compilations from ReplayDataFile")              \
3451                                                                             \
3452   product(ccstr, ReplayDataFile, NULL,                                      \
3453           "File containing compilation replay information"                  \
3454           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3455                                                                             \
3456    product(ccstr, InlineDataFile, NULL,                                     \
3457           "File containing inlining replay information"                     \
3458           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3459                                                                             \
3460   develop(intx, ReplaySuppressInitializers, 2,                              \
3461           "Control handling of class initialization during replay: "        \
3462           "0 - don't do anything special; "                                 \
3463           "1 - treat all class initializers as empty; "                     \
3464           "2 - treat class initializers for application classes as empty; " \
3465           "3 - allow all class initializers to run during bootstrap but "   \
3466           "    pretend they are empty after starting replay")               \
3467           range(0, 3)                                                       \
3468                                                                             \
3469   develop(bool, ReplayIgnoreInitErrors, false,                              \
3470           "Ignore exceptions thrown during initialization for replay")      \
3471                                                                             \
3472   product(bool, DumpReplayDataOnError, true,                                \
3473           "Record replay data for crashing compiler threads")               \
3474                                                                             \
3475   product(bool, CICompilerCountPerCPU, false,                               \
3476           "1 compiler thread for log(N CPUs)")                              \
3477                                                                             \
3478   develop(intx, CIFireOOMAt,    -1,                                         \
3479           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3480           "(non-negative value throws OOM after this many CI accesses "     \
3481           "in each compile)")                                               \
3482   notproduct(intx, CICrashAt, -1,                                           \
3483           "id of compilation to trigger assert in compiler thread for "     \
3484           "the purpose of testing, e.g. generation of replay data")         \
3485   notproduct(bool, CIObjectFactoryVerify, false,                            \
3486           "enable potentially expensive verification in ciObjectFactory")   \
3487                                                                             \
3488   /* Priorities */                                                          \
3489   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3490                                                                             \
3491   product(intx, ThreadPriorityPolicy, 0,                                    \
3492           "0 : Normal.                                                     "\
3493           "    VM chooses priorities that are appropriate for normal       "\
3494           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3495           "    to normal native priority. Java priorities below "           \
3496           "    NORM_PRIORITY map to lower native priority values. On       "\
3497           "    Windows applications are allowed to use higher native       "\
3498           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3499           "    not use the highest possible native priority,               "\
3500           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3501           "    system threads. On Linux thread priorities are ignored      "\
3502           "    because the OS does not support static priority in          "\
3503           "    SCHED_OTHER scheduling class which is the only choice for   "\
3504           "    non-root, non-realtime applications.                        "\
3505           "1 : Aggressive.                                                 "\
3506           "    Java thread priorities map over to the entire range of      "\
3507           "    native thread priorities. Higher Java thread priorities map "\
3508           "    to higher native thread priorities. This policy should be   "\
3509           "    used with care, as sometimes it can cause performance       "\
3510           "    degradation in the application and/or the entire system. On "\
3511           "    Linux this policy requires root privilege.")                 \
3512           range(0, 1)                                                       \
3513                                                                             \
3514   product(bool, ThreadPriorityVerbose, false,                               \
3515           "Print priority changes")                                         \
3516                                                                             \
3517   product(intx, CompilerThreadPriority, -1,                                 \
3518           "The native priority at which compiler threads should run "       \
3519           "(-1 means no change)")                                           \
3520           range(min_jint, max_jint)                                         \
3521           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3522                                                                             \
3523   product(intx, VMThreadPriority, -1,                                       \
3524           "The native priority at which the VM thread should run "          \
3525           "(-1 means no change)")                                           \
3526           range(-1, 127)                                                    \
3527                                                                             \
3528   product(bool, CompilerThreadHintNoPreempt, true,                          \
3529           "(Solaris only) Give compiler threads an extra quanta")           \
3530                                                                             \
3531   product(bool, VMThreadHintNoPreempt, false,                               \
3532           "(Solaris only) Give VM thread an extra quanta")                  \
3533                                                                             \
3534   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3535           "Map Java priorities to OS priorities")                           \
3536           range(-1, 127)                                                    \
3537                                                                             \
3538   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3539           "Map Java priorities to OS priorities")                           \
3540           range(-1, 127)                                                    \
3541                                                                             \
3542   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3543           "Map Java priorities to OS priorities")                           \
3544           range(-1, 127)                                                    \
3545                                                                             \
3546   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3547           "Map Java priorities to OS priorities")                           \
3548           range(-1, 127)                                                    \
3549                                                                             \
3550   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552           range(-1, 127)                                                    \
3553                                                                             \
3554   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3555           "Map Java priorities to OS priorities")                           \
3556           range(-1, 127)                                                    \
3557                                                                             \
3558   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3559           "Map Java priorities to OS priorities")                           \
3560           range(-1, 127)                                                    \
3561                                                                             \
3562   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3563           "Map Java priorities to OS priorities")                           \
3564           range(-1, 127)                                                    \
3565                                                                             \
3566   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3567           "Map Java priorities to OS priorities")                           \
3568           range(-1, 127)                                                    \
3569                                                                             \
3570   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3571           "Map Java priorities to OS priorities")                           \
3572           range(-1, 127)                                                    \
3573                                                                             \
3574   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3575           "Java thread priority 10 maps to critical scheduling priority")   \
3576                                                                             \
3577   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3578           "Compiler thread(s) run at critical scheduling priority")         \
3579                                                                             \
3580   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3581           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3582                                                                             \
3583   /* compiler debugging */                                                  \
3584   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3585           "First class to consider when using +CompileTheWorld")            \
3586                                                                             \
3587   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3588           "Last class to consider when using +CompileTheWorld")             \
3589                                                                             \
3590   develop(intx, NewCodeParameter,      0,                                   \
3591           "Testing Only: Create a dedicated integer parameter before "      \
3592           "putback")                                                        \
3593                                                                             \
3594   /* new oopmap storage allocation */                                       \
3595   develop(intx, MinOopMapAllocation,     8,                                 \
3596           "Minimum number of OopMap entries in an OopMapSet")               \
3597                                                                             \
3598   /* Background Compilation */                                              \
3599   develop(intx, LongCompileThreshold,     50,                               \
3600           "Used with +TraceLongCompiles")                                   \
3601                                                                             \
3602   /* recompilation */                                                       \
3603   product_pd(intx, CompileThreshold,                                        \
3604           "number of interpreted method invocations before (re-)compiling") \
3605           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3606                                                                             \
3607   product(double, CompileThresholdScaling, 1.0,                             \
3608           "Factor to control when first compilation happens "               \
3609           "(both with and without tiered compilation): "                    \
3610           "values greater than 1.0 delay counter overflow, "                \
3611           "values between 0 and 1.0 rush counter overflow, "                \
3612           "value of 1.0 leaves compilation thresholds unchanged "           \
3613           "value of 0.0 is equivalent to -Xint. "                           \
3614           ""                                                                \
3615           "Flag can be set as per-method option. "                          \
3616           "If a value is specified for a method, compilation thresholds "   \
3617           "for that method are scaled by both the value of the global flag "\
3618           "and the value of the per-method flag.")                          \
3619           range(0.0, DBL_MAX)                                               \
3620                                                                             \
3621   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3622           "Interpreter (tier 0) invocation notification frequency")         \
3623           range(0, 30)                                                      \
3624                                                                             \
3625   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3626           "C1 without MDO (tier 2) invocation notification frequency")      \
3627           range(0, 30)                                                      \
3628                                                                             \
3629   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3630           "C1 with MDO profiling (tier 3) invocation notification "         \
3631           "frequency")                                                      \
3632           range(0, 30)                                                      \
3633                                                                             \
3634   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3635           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3636           range(0, 30)                                                      \
3637                                                                             \
3638   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3639           "Interpreter (tier 0) invocation notification frequency")         \
3640           range(0, 30)                                                      \
3641                                                                             \
3642   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3643           "C1 without MDO (tier 2) invocation notification frequency")      \
3644           range(0, 30)                                                      \
3645                                                                             \
3646   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3647           "C1 with MDO profiling (tier 3) invocation notification "         \
3648           "frequency")                                                      \
3649           range(0, 30)                                                      \
3650                                                                             \
3651   product(intx, Tier2CompileThreshold, 0,                                   \
3652           "threshold at which tier 2 compilation is invoked")               \
3653           range(0, max_jint)                                                \
3654                                                                             \
3655   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3656           "Back edge threshold at which tier 2 compilation is invoked")     \
3657           range(0, max_jint)                                                \
3658                                                                             \
3659   product(intx, Tier3InvocationThreshold, 200,                              \
3660           "Compile if number of method invocations crosses this "           \
3661           "threshold")                                                      \
3662           range(0, max_jint)                                                \
3663                                                                             \
3664   product(intx, Tier3MinInvocationThreshold, 100,                           \
3665           "Minimum invocation to compile at tier 3")                        \
3666           range(0, max_jint)                                                \
3667                                                                             \
3668   product(intx, Tier3CompileThreshold, 2000,                                \
3669           "Threshold at which tier 3 compilation is invoked (invocation "   \
3670           "minimum must be satisfied)")                                     \
3671           range(0, max_jint)                                                \
3672                                                                             \
3673   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3674           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3675           range(0, max_jint)                                                \
3676                                                                             \
3677   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3678           "Compile if number of method invocations crosses this "           \
3679           "threshold if coming from AOT")                                   \
3680           range(0, max_jint)                                                \
3681                                                                             \
3682   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3683           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3684           range(0, max_jint)                                                \
3685                                                                             \
3686   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3687           "Threshold at which tier 3 compilation is invoked (invocation "   \
3688           "minimum must be satisfied) if coming from AOT")                  \
3689           range(0, max_jint)                                                \
3690                                                                             \
3691   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3692           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3693           "if coming from AOT")                                             \
3694           range(0, max_jint)                                                \
3695                                                                             \
3696   product(intx, Tier4InvocationThreshold, 5000,                             \
3697           "Compile if number of method invocations crosses this "           \
3698           "threshold")                                                      \
3699           range(0, max_jint)                                                \
3700                                                                             \
3701   product(intx, Tier4MinInvocationThreshold, 600,                           \
3702           "Minimum invocation to compile at tier 4")                        \
3703           range(0, max_jint)                                                \
3704                                                                             \
3705   product(intx, Tier4CompileThreshold, 15000,                               \
3706           "Threshold at which tier 4 compilation is invoked (invocation "   \
3707           "minimum must be satisfied")                                      \
3708           range(0, max_jint)                                                \
3709                                                                             \
3710   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3711           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3712           range(0, max_jint)                                                \
3713                                                                             \
3714   product(intx, Tier3DelayOn, 5,                                            \
3715           "If C2 queue size grows over this amount per compiler thread "    \
3716           "stop compiling at tier 3 and start compiling at tier 2")         \
3717           range(0, max_jint)                                                \
3718                                                                             \
3719   product(intx, Tier3DelayOff, 2,                                           \
3720           "If C2 queue size is less than this amount per compiler thread "  \
3721           "allow methods compiled at tier 2 transition to tier 3")          \
3722           range(0, max_jint)                                                \
3723                                                                             \
3724   product(intx, Tier3LoadFeedback, 5,                                       \
3725           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3726           "reaches this amount per compiler thread")                        \
3727           range(0, max_jint)                                                \
3728                                                                             \
3729   product(intx, Tier4LoadFeedback, 3,                                       \
3730           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3731           "reaches this amount per compiler thread")                        \
3732           range(0, max_jint)                                                \
3733                                                                             \
3734   product(intx, TieredCompileTaskTimeout, 50,                               \
3735           "Kill compile task if method was not used within "                \
3736           "given timeout in milliseconds")                                  \
3737           range(0, max_intx)                                                \
3738                                                                             \
3739   product(intx, TieredStopAtLevel, 4,                                       \
3740           "Stop at given compilation level")                                \
3741           range(0, 4)                                                       \
3742                                                                             \
3743   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3744           "Start profiling in interpreter if the counters exceed tier 3 "   \
3745           "thresholds by the specified percentage")                         \
3746           range(0, max_jint)                                                \
3747                                                                             \
3748   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3749           "Increase the compile threshold for C1 compilation if the code "  \
3750           "cache is filled by the specified percentage")                    \
3751           range(0, 99)                                                      \
3752                                                                             \
3753   product(intx, TieredRateUpdateMinTime, 1,                                 \
3754           "Minimum rate sampling interval (in milliseconds)")               \
3755           range(0, max_intx)                                                \
3756                                                                             \
3757   product(intx, TieredRateUpdateMaxTime, 25,                                \
3758           "Maximum rate sampling interval (in milliseconds)")               \
3759           range(0, max_intx)                                                \
3760                                                                             \
3761   product_pd(bool, TieredCompilation,                                       \
3762           "Enable tiered compilation")                                      \
3763                                                                             \
3764   product(bool, PrintTieredEvents, false,                                   \
3765           "Print tiered events notifications")                              \
3766                                                                             \
3767   product_pd(intx, OnStackReplacePercentage,                                \
3768           "NON_TIERED number of method invocations/branches (expressed as " \
3769           "% of CompileThreshold) before (re-)compiling OSR code")          \
3770           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3771                                                                             \
3772   product(intx, InterpreterProfilePercentage, 33,                           \
3773           "NON_TIERED number of method invocations/branches (expressed as " \
3774           "% of CompileThreshold) before profiling in the interpreter")     \
3775           range(0, 100)                                                     \
3776                                                                             \
3777   develop(intx, MaxRecompilationSearchLength,    10,                        \
3778           "The maximum number of frames to inspect when searching for "     \
3779           "recompilee")                                                     \
3780                                                                             \
3781   develop(intx, MaxInterpretedSearchLength,     3,                          \
3782           "The maximum number of interpreted frames to skip when searching "\
3783           "for recompilee")                                                 \
3784                                                                             \
3785   develop(intx, DesiredMethodLimit,  8000,                                  \
3786           "The desired maximum method size (in bytecodes) after inlining")  \
3787                                                                             \
3788   develop(intx, HugeMethodLimit,  8000,                                     \
3789           "Don't compile methods larger than this if "                      \
3790           "+DontCompileHugeMethods")                                        \
3791                                                                             \
3792   /* New JDK 1.4 reflection implementation */                               \
3793                                                                             \
3794   develop(intx, FastSuperclassLimit, 8,                                     \
3795           "Depth of hardwired instanceof accelerator array")                \
3796                                                                             \
3797   /* Properties for Java libraries  */                                      \
3798                                                                             \
3799   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3800           "Maximum total size of NIO direct-buffer allocations")            \
3801           range(0, max_jlong)                                               \
3802                                                                             \
3803   /* Flags used for temporary code during development  */                   \
3804                                                                             \
3805   diagnostic(bool, UseNewCode, false,                                       \
3806           "Testing Only: Use the new version while testing")                \
3807                                                                             \
3808   diagnostic(bool, UseNewCode2, false,                                      \
3809           "Testing Only: Use the new version while testing")                \
3810                                                                             \
3811   diagnostic(bool, UseNewCode3, false,                                      \
3812           "Testing Only: Use the new version while testing")                \
3813                                                                             \
3814   /* flags for performance data collection */                               \
3815                                                                             \
3816   product(bool, UsePerfData, true,                                          \
3817           "Flag to disable jvmstat instrumentation for performance testing "\
3818           "and problem isolation purposes")                                 \
3819                                                                             \
3820   product(bool, PerfDataSaveToFile, false,                                  \
3821           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3822                                                                             \
3823   product(ccstr, PerfDataSaveFile, NULL,                                    \
3824           "Save PerfData memory to the specified absolute pathname. "       \
3825           "The string %p in the file name (if present) "                    \
3826           "will be replaced by pid")                                        \
3827                                                                             \
3828   product(intx, PerfDataSamplingInterval, 50,                               \
3829           "Data sampling interval (in milliseconds)")                       \
3830           range(PeriodicTask::min_interval, max_jint)                       \
3831           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3832                                                                             \
3833   product(bool, PerfDisableSharedMem, false,                                \
3834           "Store performance data in standard memory")                      \
3835                                                                             \
3836   product(intx, PerfDataMemorySize, 32*K,                                   \
3837           "Size of performance data memory region. Will be rounded "        \
3838           "up to a multiple of the native os page size.")                   \
3839           range(128, 32*64*K)                                               \
3840                                                                             \
3841   product(intx, PerfMaxStringConstLength, 1024,                             \
3842           "Maximum PerfStringConstant string length before truncation")     \
3843           range(32, 32*K)                                                   \
3844                                                                             \
3845   product(bool, PerfAllowAtExitRegistration, false,                         \
3846           "Allow registration of atexit() methods")                         \
3847                                                                             \
3848   product(bool, PerfBypassFileSystemCheck, false,                           \
3849           "Bypass Win32 file system criteria checks (Windows Only)")        \
3850                                                                             \
3851   product(intx, UnguardOnExecutionViolation, 0,                             \
3852           "Unguard page and retry on no-execute fault (Win32 only) "        \
3853           "0=off, 1=conservative, 2=aggressive")                            \
3854           range(0, 2)                                                       \
3855                                                                             \
3856   /* Serviceability Support */                                              \
3857                                                                             \
3858   product(bool, ManagementServer, false,                                    \
3859           "Create JMX Management Server")                                   \
3860                                                                             \
3861   product(bool, DisableAttachMechanism, false,                              \
3862           "Disable mechanism that allows tools to attach to this VM")       \
3863                                                                             \
3864   product(bool, StartAttachListener, false,                                 \
3865           "Always start Attach Listener at VM startup")                     \
3866                                                                             \
3867   product(bool, EnableDynamicAgentLoading, true,                            \
3868           "Allow tools to load agents with the attach mechanism")           \
3869                                                                             \
3870   manageable(bool, PrintConcurrentLocks, false,                             \
3871           "Print java.util.concurrent locks in thread dump")                \
3872                                                                             \
3873   product(bool, TransmitErrorReport, false,                                 \
3874           "Enable error report transmission on erroneous termination")      \
3875                                                                             \
3876   product(ccstr, ErrorReportServer, NULL,                                   \
3877           "Override built-in error report server address")                  \
3878                                                                             \
3879   /* Shared spaces */                                                       \
3880                                                                             \
3881   product(bool, UseSharedSpaces, true,                                      \
3882           "Use shared spaces for metadata")                                 \
3883                                                                             \
3884   product(bool, VerifySharedSpaces, false,                                  \
3885           "Verify shared spaces (false for default archive, true for "      \
3886           "archive specified by -XX:SharedArchiveFile)")                    \
3887                                                                             \
3888   product(bool, RequireSharedSpaces, false,                                 \
3889           "Require shared spaces for metadata")                             \
3890                                                                             \
3891   product(bool, DumpSharedSpaces, false,                                    \
3892           "Special mode: JVM reads a class list, loads classes, builds "    \
3893           "shared spaces, and dumps the shared spaces to a file to be "     \
3894           "used in future JVM runs")                                        \
3895                                                                             \
3896   product(bool, PrintSharedArchiveAndExit, false,                           \
3897           "Print shared archive file contents")                             \
3898                                                                             \
3899   product(bool, PrintSharedDictionary, false,                               \
3900           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3901           "dictionary")                                                     \
3902                                                                             \
3903   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
3904           "Size of read-write space for metadata (in bytes)")               \
3905           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
3906           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
3907                                                                             \
3908   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
3909           "Size of read-only space for metadata (in bytes)")                \
3910           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
3911           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
3912                                                                             \
3913   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
3914           "Size of the shared miscellaneous data area (in bytes)")          \
3915           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
3916           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
3917                                                                             \
3918   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
3919           "Size of the shared miscellaneous code area (in bytes)")          \
3920           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
3921           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
3922                                                                             \
3923   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3924           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3925           "Address to allocate shared memory region for class data")        \
3926           range(0, SIZE_MAX)                                                \
3927                                                                             \
3928   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3929           "Average number of symbols per bucket in shared table")           \
3930           range(2, 246)                                                     \
3931                                                                             \
3932   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3933           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3934           "classes. Just exclude them from the shared dictionary.")         \
3935                                                                             \
3936   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3937           "Print generated stub code for method handles")                   \
3938                                                                             \
3939   develop(bool, TraceMethodHandles, false,                                  \
3940           "trace internal method handle operations")                        \
3941                                                                             \
3942   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3943           "perform extra checks when constructing method handles")          \
3944                                                                             \
3945   diagnostic(bool, ShowHiddenFrames, false,                                 \
3946           "show method handle implementation frames (usually hidden)")      \
3947                                                                             \
3948   experimental(bool, TrustFinalNonStaticFields, false,                      \
3949           "trust final non-static declarations for constant folding")       \
3950                                                                             \
3951   diagnostic(bool, FoldStableValues, true,                                  \
3952           "Optimize loads from stable fields (marked w/ @Stable)")          \
3953                                                                             \
3954   develop(bool, TraceInvokeDynamic, false,                                  \
3955           "trace internal invoke dynamic operations")                       \
3956                                                                             \
3957   diagnostic(bool, PauseAtStartup,      false,                              \
3958           "Causes the VM to pause at startup time and wait for the pause "  \
3959           "file to be removed (default: ./vm.paused.<pid>)")                \
3960                                                                             \
3961   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3962           "The file to create and for whose removal to await when pausing " \
3963           "at startup. (default: ./vm.paused.<pid>)")                       \
3964                                                                             \
3965   diagnostic(bool, PauseAtExit, false,                                      \
3966           "Pause and wait for keypress on exit if a debugger is attached")  \
3967                                                                             \
3968   product(bool, ExtendedDTraceProbes,    false,                             \
3969           "Enable performance-impacting dtrace probes")                     \
3970                                                                             \
3971   product(bool, DTraceMethodProbes, false,                                  \
3972           "Enable dtrace probes for method-entry and method-exit")          \
3973                                                                             \
3974   product(bool, DTraceAllocProbes, false,                                   \
3975           "Enable dtrace probes for object allocation")                     \
3976                                                                             \
3977   product(bool, DTraceMonitorProbes, false,                                 \
3978           "Enable dtrace probes for monitor events")                        \
3979                                                                             \
3980   product(bool, RelaxAccessControlCheck, false,                             \
3981           "Relax the access control checks in the verifier")                \
3982                                                                             \
3983   product(uintx, StringTableSize, defaultStringTableSize,                   \
3984           "Number of buckets in the interned String table")                 \
3985           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3986                                                                             \
3987   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3988           "Number of buckets in the JVM internal Symbol table")             \
3989           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3990                                                                             \
3991   product(bool, UseStringDeduplication, false,                              \
3992           "Use string deduplication")                                       \
3993                                                                             \
3994   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3995           "A string must reach this age (or be promoted to an old region) " \
3996           "to be considered for deduplication")                             \
3997           range(1, markOopDesc::max_age)                                    \
3998                                                                             \
3999   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4000           "Force table resize every time the table is scanned")             \
4001                                                                             \
4002   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4003           "Force table rehash every time the table is scanned")             \
4004                                                                             \
4005   diagnostic(bool, WhiteBoxAPI, false,                                      \
4006           "Enable internal testing APIs")                                   \
4007                                                                             \
4008   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4009            "Default survivor space alignment in bytes")                     \
4010            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4011                                                                             \
4012   product(bool , AllowNonVirtualCalls, false,                               \
4013           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4014                                                                             \
4015   product(ccstr, DumpLoadedClassList, NULL,                                 \
4016           "Dump the names all loaded classes, that could be stored into "   \
4017           "the CDS archive, in the specified file")                         \
4018                                                                             \
4019   product(ccstr, SharedClassListFile, NULL,                                 \
4020           "Override the default CDS class list")                            \
4021                                                                             \
4022   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4023           "Override the default location of the CDS archive file")          \
4024                                                                             \
4025   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4026           "Extra classlist for building the CDS archive file")              \
4027                                                                             \
4028   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4029           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4030           "Allocation less than this value will be allocated "              \
4031           "using malloc. Larger allocations will use mmap.")                \
4032                                                                             \
4033   experimental(bool, AlwaysAtomicAccesses, false,                           \
4034           "Accesses to all variables should always be atomic")              \
4035                                                                             \
4036   product(bool, EnableTracing, false,                                       \
4037           "Enable event-based tracing")                                     \
4038                                                                             \
4039   product(bool, UseLockedTracing, false,                                    \
4040           "Use locked-tracing when doing event-based tracing")              \
4041                                                                             \
4042   diagnostic(bool, UseUnalignedAccesses, false,                             \
4043           "Use unaligned memory accesses in Unsafe")                        \
4044                                                                             \
4045   product_pd(bool, PreserveFramePointer,                                    \
4046              "Use the FP register for holding the frame pointer "           \
4047              "and not as a general purpose register.")                      \
4048                                                                             \
4049   diagnostic(bool, CheckIntrinsics, true,                                   \
4050              "When a class C is loaded, check that "                        \
4051              "(1) all intrinsics defined by the VM for class C are present "\
4052              "in the loaded class file and are marked with the "            \
4053              "@HotSpotIntrinsicCandidate annotation, that "                 \
4054              "(2) there is an intrinsic registered for all loaded methods " \
4055              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4056              "annotation, and that "                                        \
4057              "(3) no orphan methods exist for class C (i.e., methods for "  \
4058              "which the VM declares an intrinsic but that are not declared "\
4059              "in the loaded class C. "                                      \
4060              "Check (3) is available only in debug builds.")                \
4061                                                                             \
4062   diagnostic_pd(intx, InitArrayShortSize,                                   \
4063           "Threshold small size (in bytes) for clearing arrays. "           \
4064           "Anything this size or smaller may get converted to discrete "    \
4065           "scalar stores.")                                                 \
4066           range(0, max_intx)                                                \
4067           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4068                                                                             \
4069   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4070              "Disable backwards compatibility for compile commands.")       \
4071                                                                             \
4072   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4073              "Print compiler directives on installation.")                  \
4074   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4075              "Limit on number of compiler directives.")
4076 
4077 
4078 /*
4079  *  Macros for factoring of globals
4080  */
4081 
4082 // Interface macros
4083 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4084 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4085 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4086 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4087 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4088 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4089 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4090 #ifdef PRODUCT
4091 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4092 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4093 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4094 #else
4095 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4096 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4097 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4098 #endif // PRODUCT
4099 // Special LP64 flags, product only needed for now.
4100 #ifdef _LP64
4101 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4102 #else
4103 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4104 #endif // _LP64
4105 
4106 // Implementation macros
4107 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4108 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4109 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4110 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4111 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4112 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4113 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4114 #ifdef PRODUCT
4115 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4116 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4117 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4118 #else
4119 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4120 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4121 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4122 #endif // PRODUCT
4123 #ifdef _LP64
4124 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4125 #else
4126 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4127 #endif // _LP64
4128 
4129 // Only materialize src code for range checking when required, ignore otherwise
4130 #define IGNORE_RANGE(a, b)
4131 // Only materialize src code for contraint checking when required, ignore otherwise
4132 #define IGNORE_CONSTRAINT(func,type)
4133 
4134 #define IGNORE_WRITEABLE(type)
4135 
4136 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4137               DECLARE_PD_DEVELOPER_FLAG, \
4138               DECLARE_PRODUCT_FLAG, \
4139               DECLARE_PD_PRODUCT_FLAG, \
4140               DECLARE_DIAGNOSTIC_FLAG, \
4141               DECLARE_PD_DIAGNOSTIC_FLAG, \
4142               DECLARE_EXPERIMENTAL_FLAG, \
4143               DECLARE_NOTPRODUCT_FLAG, \
4144               DECLARE_MANAGEABLE_FLAG, \
4145               DECLARE_PRODUCT_RW_FLAG, \
4146               DECLARE_LP64_PRODUCT_FLAG, \
4147               IGNORE_RANGE, \
4148               IGNORE_CONSTRAINT, \
4149               IGNORE_WRITEABLE)
4150 
4151 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4152                  DECLARE_PD_DEVELOPER_FLAG, \
4153                  DECLARE_PRODUCT_FLAG, \
4154                  DECLARE_PD_PRODUCT_FLAG, \
4155                  DECLARE_DIAGNOSTIC_FLAG, \
4156                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4157                  DECLARE_NOTPRODUCT_FLAG, \
4158                  IGNORE_RANGE, \
4159                  IGNORE_CONSTRAINT, \
4160                  IGNORE_WRITEABLE)
4161 
4162 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4163            DECLARE_PRODUCT_FLAG, \
4164            DECLARE_DIAGNOSTIC_FLAG, \
4165            DECLARE_EXPERIMENTAL_FLAG, \
4166            DECLARE_NOTPRODUCT_FLAG, \
4167            IGNORE_RANGE, \
4168            IGNORE_CONSTRAINT, \
4169            IGNORE_WRITEABLE)
4170 
4171 // Extensions
4172 
4173 #include "runtime/globals_ext.hpp"
4174 
4175 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP