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   product(bool, MethodFlushing, true,                                       \
 719           "Reclamation of zombie and not-entrant methods")                  \
 720                                                                             \
 721   develop(bool, VerifyStack, false,                                         \
 722           "Verify stack of each thread when it is entering a runtime call") \
 723                                                                             \
 724   diagnostic(bool, ForceUnreachable, false,                                 \
 725           "Make all non code cache addresses to be unreachable by "         \
 726           "forcing use of 64bit literal fixups")                            \
 727                                                                             \
 728   notproduct(bool, StressDerivedPointers, false,                            \
 729           "Force scavenge when a derived pointer is detected on stack "     \
 730           "after rtm call")                                                 \
 731                                                                             \
 732   develop(bool, TraceDerivedPointers, false,                                \
 733           "Trace traversal of derived pointers on stack")                   \
 734                                                                             \
 735   notproduct(bool, TraceCodeBlobStacks, false,                              \
 736           "Trace stack-walk of codeblobs")                                  \
 737                                                                             \
 738   product(bool, PrintJNIResolving, false,                                   \
 739           "Used to implement -v:jni")                                       \
 740                                                                             \
 741   notproduct(bool, PrintRewrites, false,                                    \
 742           "Print methods that are being rewritten")                         \
 743                                                                             \
 744   product(bool, UseInlineCaches, true,                                      \
 745           "Use Inline Caches for virtual calls ")                           \
 746                                                                             \
 747   diagnostic(bool, InlineArrayCopy, true,                                   \
 748           "Inline arraycopy native that is known to be part of "            \
 749           "base library DLL")                                               \
 750                                                                             \
 751   diagnostic(bool, InlineObjectHash, true,                                  \
 752           "Inline Object::hashCode() native that is known to be part "      \
 753           "of base library DLL")                                            \
 754                                                                             \
 755   diagnostic(bool, InlineNatives, true,                                     \
 756           "Inline natives that are known to be part of base library DLL")   \
 757                                                                             \
 758   diagnostic(bool, InlineMathNatives, true,                                 \
 759           "Inline SinD, CosD, etc.")                                        \
 760                                                                             \
 761   diagnostic(bool, InlineClassNatives, true,                                \
 762           "Inline Class.isInstance, etc")                                   \
 763                                                                             \
 764   diagnostic(bool, InlineThreadNatives, true,                               \
 765           "Inline Thread.currentThread, etc")                               \
 766                                                                             \
 767   diagnostic(bool, InlineUnsafeOps, true,                                   \
 768           "Inline memory ops (native methods) from Unsafe")                 \
 769                                                                             \
 770   product(bool, CriticalJNINatives, true,                                   \
 771           "Check for critical JNI entry points")                            \
 772                                                                             \
 773   notproduct(bool, StressCriticalJNINatives, false,                         \
 774           "Exercise register saving code in critical natives")              \
 775                                                                             \
 776   diagnostic(bool, UseAESIntrinsics, false,                                 \
 777           "Use intrinsics for AES versions of crypto")                      \
 778                                                                             \
 779   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 780           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 781                                                                             \
 782   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 783           "Use intrinsics for SHA-1 crypto hash function. "                 \
 784           "Requires that UseSHA is enabled.")                               \
 785                                                                             \
 786   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 787           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 788           "Requires that UseSHA is enabled.")                               \
 789                                                                             \
 790   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 791           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 792           "Requires that UseSHA is enabled.")                               \
 793                                                                             \
 794   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 795           "use intrinsics for java.util.zip.CRC32")                         \
 796                                                                             \
 797   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 798           "use intrinsics for java.util.zip.CRC32C")                        \
 799                                                                             \
 800   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 801           "use intrinsics for java.util.zip.Adler32")                       \
 802                                                                             \
 803   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 804           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 805                                                                             \
 806   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 807          "do not expand intrinsics whose (internal) names appear here")     \
 808                                                                             \
 809   develop(bool, TraceCallFixup, false,                                      \
 810           "Trace all call fixups")                                          \
 811                                                                             \
 812   develop(bool, DeoptimizeALot, false,                                      \
 813           "Deoptimize at every exit from the runtime system")               \
 814                                                                             \
 815   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 816           "A comma separated list of bcis to deoptimize at")                \
 817                                                                             \
 818   product(bool, DeoptimizeRandom, false,                                    \
 819           "Deoptimize random frames on random exit from the runtime system")\
 820                                                                             \
 821   notproduct(bool, ZombieALot, false,                                       \
 822           "Create zombies (non-entrant) at exit from the runtime system")   \
 823                                                                             \
 824   product(bool, UnlinkSymbolsALot, false,                                   \
 825           "Unlink unreferenced symbols from the symbol table at safepoints")\
 826                                                                             \
 827   notproduct(bool, WalkStackALot, false,                                    \
 828           "Trace stack (no print) at every exit from the runtime system")   \
 829                                                                             \
 830   product(bool, Debugging, false,                                           \
 831           "Set when executing debug methods in debug.cpp "                  \
 832           "(to prevent triggering assertions)")                             \
 833                                                                             \
 834   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 835           "Enable strict checks that safepoints cannot happen for threads " \
 836           "that use NoSafepointVerifier")                                   \
 837                                                                             \
 838   notproduct(bool, VerifyLastFrame, false,                                  \
 839           "Verify oops on last frame on entry to VM")                       \
 840                                                                             \
 841   product(bool, FailOverToOldVerifier, true,                                \
 842           "Fail over to old verifier when split verifier fails")            \
 843                                                                             \
 844   develop(bool, ShowSafepointMsgs, false,                                   \
 845           "Show message about safepoint synchronization")                   \
 846                                                                             \
 847   product(bool, SafepointTimeout, false,                                    \
 848           "Time out and warn or fail after SafepointTimeoutDelay "          \
 849           "milliseconds if failed to reach safepoint")                      \
 850                                                                             \
 851   develop(bool, DieOnSafepointTimeout, false,                               \
 852           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 853                                                                             \
 854   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 855   /* typically, at most a few retries are needed                    */      \
 856   product(intx, SuspendRetryCount, 50,                                      \
 857           "Maximum retry count for an external suspend request")            \
 858           range(0, max_intx)                                                \
 859                                                                             \
 860   product(intx, SuspendRetryDelay, 5,                                       \
 861           "Milliseconds to delay per retry (* current_retry_count)")        \
 862           range(0, max_intx)                                                \
 863                                                                             \
 864   product(bool, AssertOnSuspendWaitFailure, false,                          \
 865           "Assert/Guarantee on external suspend wait failure")              \
 866                                                                             \
 867   product(bool, TraceSuspendWaitFailures, false,                            \
 868           "Trace external suspend wait failures")                           \
 869                                                                             \
 870   product(bool, MaxFDLimit, true,                                           \
 871           "Bump the number of file descriptors to maximum in Solaris")      \
 872                                                                             \
 873   diagnostic(bool, LogEvents, true,                                         \
 874           "Enable the various ring buffer event logs")                      \
 875                                                                             \
 876   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 877           "Number of ring buffer event logs")                               \
 878           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 879                                                                             \
 880   product(bool, BytecodeVerificationRemote, true,                           \
 881           "Enable the Java bytecode verifier for remote classes")           \
 882                                                                             \
 883   product(bool, BytecodeVerificationLocal, false,                           \
 884           "Enable the Java bytecode verifier for local classes")            \
 885                                                                             \
 886   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 887           "Force exceptions on FP stack under/overflow")                    \
 888                                                                             \
 889   develop(bool, VerifyStackAtCalls, false,                                  \
 890           "Verify that the stack pointer is unchanged after calls")         \
 891                                                                             \
 892   develop(bool, TraceJavaAssertions, false,                                 \
 893           "Trace java language assertions")                                 \
 894                                                                             \
 895   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 896           "Temporary - see javaClasses.cpp")                                \
 897                                                                             \
 898   notproduct(bool, PrintMallocFree, false,                                  \
 899           "Trace calls to C heap malloc/free allocation")                   \
 900                                                                             \
 901   notproduct(bool, VerifyCodeCache, false,                                  \
 902           "Verify code cache on memory allocation/deallocation")            \
 903                                                                             \
 904   develop(bool, UseMallocOnly, false,                                       \
 905           "Use only malloc/free for allocation (no resource area/arena)")   \
 906                                                                             \
 907   develop(bool, PrintMalloc, false,                                         \
 908           "Print all malloc/free calls")                                    \
 909                                                                             \
 910   develop(bool, PrintMallocStatistics, false,                               \
 911           "Print malloc/free statistics")                                   \
 912                                                                             \
 913   develop(bool, ZapResourceArea, trueInDebug,                               \
 914           "Zap freed resource/arena space with 0xABABABAB")                 \
 915                                                                             \
 916   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 917           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 918                                                                             \
 919   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 920           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 921                                                                             \
 922   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 923           "Zap allocated/freed stack segments with 0xFADFADED")             \
 924                                                                             \
 925   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 926           "Zap unused heap space with 0xBAADBABE")                          \
 927                                                                             \
 928   develop(bool, CheckZapUnusedHeapArea, false,                              \
 929           "Check zapping of unused heap space")                             \
 930                                                                             \
 931   develop(bool, ZapFillerObjects, trueInDebug,                              \
 932           "Zap filler objects with 0xDEAFBABE")                             \
 933                                                                             \
 934   develop(bool, PrintVMMessages, true,                                      \
 935           "Print VM messages on console")                                   \
 936                                                                             \
 937   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 938           "If > 0, provokes an error after VM initialization; the value "   \
 939           "determines which error to provoke. See test_error_handler() "    \
 940           "in vmError.cpp.")                                                \
 941                                                                             \
 942   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 943           "If > 0, provokes an error inside VM error handler (a secondary " \
 944           "crash). see test_error_handler() in vmError.cpp")                \
 945                                                                             \
 946   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 947           "If true, tests SafeFetch inside error handler.")                 \
 948                                                                             \
 949   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 950           "If true, simulates an unresponsive error handler.")              \
 951                                                                             \
 952   develop(bool, Verbose, false,                                             \
 953           "Print additional debugging information from other modes")        \
 954                                                                             \
 955   develop(bool, PrintMiscellaneous, false,                                  \
 956           "Print uncategorized debugging information (requires +Verbose)")  \
 957                                                                             \
 958   develop(bool, WizardMode, false,                                          \
 959           "Print much more debugging information")                          \
 960                                                                             \
 961   product(bool, ShowMessageBoxOnError, false,                               \
 962           "Keep process alive on VM fatal error")                           \
 963                                                                             \
 964   product(bool, CreateCoredumpOnCrash, true,                                \
 965           "Create core/mini dump on VM fatal error")                        \
 966                                                                             \
 967   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 968           "Timeout, in seconds, to limit the time spent on writing an "     \
 969           "error log in case of a crash.")                                  \
 970           range(0, (uint64_t)max_jlong/1000)                                \
 971                                                                             \
 972   product_pd(bool, UseOSErrorReporting,                                     \
 973           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 974                                                                             \
 975   product(bool, SuppressFatalErrorMessage, false,                           \
 976           "Report NO fatal error message (avoid deadlock)")                 \
 977                                                                             \
 978   product(ccstrlist, OnError, "",                                           \
 979           "Run user-defined commands on fatal error; see VMError.cpp "      \
 980           "for examples")                                                   \
 981                                                                             \
 982   product(ccstrlist, OnOutOfMemoryError, "",                                \
 983           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 984                                                                             \
 985   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 986           "Dump heap to file before any major stop-the-world GC")           \
 987                                                                             \
 988   manageable(bool, HeapDumpAfterFullGC, false,                              \
 989           "Dump heap to file after any major stop-the-world GC")            \
 990                                                                             \
 991   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 992           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 993                                                                             \
 994   manageable(ccstr, HeapDumpPath, NULL,                                     \
 995           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 996           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 997           "in the working directory)")                                      \
 998                                                                             \
 999   develop(bool, BreakAtWarning, false,                                      \
1000           "Execute breakpoint upon encountering VM warning")                \
1001                                                                             \
1002   develop(bool, UseFakeTimers, false,                                       \
1003           "Tell whether the VM should use system time or a fake timer")     \
1004                                                                             \
1005   product(ccstr, NativeMemoryTracking, "off",                               \
1006           "Native memory tracking options")                                 \
1007                                                                             \
1008   diagnostic(bool, PrintNMTStatistics, false,                               \
1009           "Print native memory tracking summary data if it is on")          \
1010                                                                             \
1011   diagnostic(bool, LogCompilation, false,                                   \
1012           "Log compilation activity in detail to LogFile")                  \
1013                                                                             \
1014   product(bool, PrintCompilation, false,                                    \
1015           "Print compilations")                                             \
1016                                                                             \
1017   diagnostic(bool, TraceNMethodInstalls, false,                             \
1018           "Trace nmethod installation")                                     \
1019                                                                             \
1020   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1021           "0: do not allow scavengable oops in the code cache; "            \
1022           "1: allow scavenging from the code cache; "                       \
1023           "2: emit as many constants as the compiler can see")              \
1024           range(0, 2)                                                       \
1025                                                                             \
1026   product(bool, AlwaysRestoreFPU, false,                                    \
1027           "Restore the FPU control word after every JNI call (expensive)")  \
1028                                                                             \
1029   diagnostic(bool, PrintCompilation2, false,                                \
1030           "Print additional statistics per compilation")                    \
1031                                                                             \
1032   diagnostic(bool, PrintAdapterHandlers, false,                             \
1033           "Print code generated for i2c/c2i adapters")                      \
1034                                                                             \
1035   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1036           "Verify that i2c/c2i adapters are called properly")               \
1037                                                                             \
1038   develop(bool, VerifyAdapterSharing, false,                                \
1039           "Verify that the code for shared adapters is the equivalent")     \
1040                                                                             \
1041   diagnostic(bool, PrintAssembly, false,                                    \
1042           "Print assembly code (using external disassembler.so)")           \
1043                                                                             \
1044   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1045           "Print options string passed to disassembler.so")                 \
1046                                                                             \
1047   notproduct(bool, PrintNMethodStatistics, false,                           \
1048           "Print a summary statistic for the generated nmethods")           \
1049                                                                             \
1050   diagnostic(bool, PrintNMethods, false,                                    \
1051           "Print assembly code for nmethods when generated")                \
1052                                                                             \
1053   diagnostic(bool, PrintNativeNMethods, false,                              \
1054           "Print assembly code for native nmethods when generated")         \
1055                                                                             \
1056   develop(bool, PrintDebugInfo, false,                                      \
1057           "Print debug information for all nmethods when generated")        \
1058                                                                             \
1059   develop(bool, PrintRelocations, false,                                    \
1060           "Print relocation information for all nmethods when generated")   \
1061                                                                             \
1062   develop(bool, PrintDependencies, false,                                   \
1063           "Print dependency information for all nmethods when generated")   \
1064                                                                             \
1065   develop(bool, PrintExceptionHandlers, false,                              \
1066           "Print exception handler tables for all nmethods when generated") \
1067                                                                             \
1068   develop(bool, StressCompiledExceptionHandlers, false,                     \
1069           "Exercise compiled exception handlers")                           \
1070                                                                             \
1071   develop(bool, InterceptOSException, false,                                \
1072           "Start debugger when an implicit OS (e.g. NULL) "                 \
1073           "exception happens")                                              \
1074                                                                             \
1075   product(bool, PrintCodeCache, false,                                      \
1076           "Print the code cache memory usage when exiting")                 \
1077                                                                             \
1078   develop(bool, PrintCodeCache2, false,                                     \
1079           "Print detailed usage information on the code cache when exiting")\
1080                                                                             \
1081   product(bool, PrintCodeCacheOnCompilation, false,                         \
1082           "Print the code cache memory usage each time a method is "        \
1083           "compiled")                                                       \
1084                                                                             \
1085   diagnostic(bool, PrintStubCode, false,                                    \
1086           "Print generated stub code")                                      \
1087                                                                             \
1088   product(bool, StackTraceInThrowable, true,                                \
1089           "Collect backtrace in throwable when exception happens")          \
1090                                                                             \
1091   product(bool, OmitStackTraceInFastThrow, true,                            \
1092           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1093                                                                             \
1094   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1095           "Print bytecode statistics when dumping profiler output")         \
1096                                                                             \
1097   product(bool, ProfilerRecordPC, false,                                    \
1098           "Collect ticks for each 16 byte interval of compiled code")       \
1099                                                                             \
1100   product(bool, ProfileVM, false,                                           \
1101           "Profile ticks that fall within VM (either in the VM Thread "     \
1102           "or VM code called through stubs)")                               \
1103                                                                             \
1104   product(bool, ProfileIntervals, false,                                    \
1105           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1106                                                                             \
1107   notproduct(bool, ProfilerCheckIntervals, false,                           \
1108           "Collect and print information on spacing of profiler ticks")     \
1109                                                                             \
1110   product(bool, PrintWarnings, true,                                        \
1111           "Print JVM warnings to output stream")                            \
1112                                                                             \
1113   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1114           "Print warnings for stalled SpinLocks")                           \
1115                                                                             \
1116   product(bool, RegisterFinalizersAtInit, true,                             \
1117           "Register finalizable objects at end of Object.<init> or "        \
1118           "after allocation")                                               \
1119                                                                             \
1120   develop(bool, RegisterReferences, true,                                   \
1121           "Tell whether the VM should register soft/weak/final/phantom "    \
1122           "references")                                                     \
1123                                                                             \
1124   develop(bool, IgnoreRewrites, false,                                      \
1125           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1126           "This is unsafe!")                                                \
1127                                                                             \
1128   develop(bool, PrintCodeCacheExtension, false,                             \
1129           "Print extension of code cache")                                  \
1130                                                                             \
1131   develop(bool, UsePrivilegedStack, true,                                   \
1132           "Enable the security JVM functions")                              \
1133                                                                             \
1134   develop(bool, ProtectionDomainVerification, true,                         \
1135           "Verify protection domain before resolution in system dictionary")\
1136                                                                             \
1137   product(bool, ClassUnloading, true,                                       \
1138           "Do unloading of classes")                                        \
1139                                                                             \
1140   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1141           "Do unloading of classes with a concurrent marking cycle")        \
1142                                                                             \
1143   develop(bool, DisableStartThread, false,                                  \
1144           "Disable starting of additional Java threads "                    \
1145           "(for debugging only)")                                           \
1146                                                                             \
1147   develop(bool, MemProfiling, false,                                        \
1148           "Write memory usage profiling to log file")                       \
1149                                                                             \
1150   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1151           "Print the system dictionary at exit")                            \
1152                                                                             \
1153   experimental(intx, PredictedLoadedClassCount, 0,                          \
1154           "Experimental: Tune loaded class cache starting size")            \
1155                                                                             \
1156   diagnostic(bool, UnsyncloadClass, false,                                  \
1157           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1158           "class loader must call VM synchronized for findClass "           \
1159           "and defineClass.")                                               \
1160                                                                             \
1161   product(bool, AlwaysLockClassLoader, false,                               \
1162           "Require the VM to acquire the class loader lock before calling " \
1163           "loadClass() even for class loaders registering "                 \
1164           "as parallel capable")                                            \
1165                                                                             \
1166   product(bool, AllowParallelDefineClass, false,                            \
1167           "Allow parallel defineClass requests for class loaders "          \
1168           "registering as parallel capable")                                \
1169                                                                             \
1170   product(bool, MustCallLoadClassInternal, false,                           \
1171           "Call loadClassInternal() rather than loadClass()")               \
1172                                                                             \
1173   product_pd(bool, DontYieldALot,                                           \
1174           "Throw away obvious excess yield calls")                          \
1175                                                                             \
1176   develop(bool, UseDetachedThreads, true,                                   \
1177           "Use detached threads that are recycled upon termination "        \
1178           "(for Solaris only)")                                             \
1179                                                                             \
1180   product(bool, UseLWPSynchronization, true,                                \
1181           "Use LWP-based instead of libthread-based synchronization "       \
1182           "(SPARC only)")                                                   \
1183                                                                             \
1184   experimental(ccstr, SyncKnobs, NULL,                                      \
1185                "(Unstable) Various monitor synchronization tunables")       \
1186                                                                             \
1187   experimental(intx, EmitSync, 0,                                           \
1188                "(Unsafe, Unstable) "                                        \
1189                "Control emission of inline sync fast-path code")            \
1190                                                                             \
1191   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1192           range(0, max_jint)                                                \
1193                                                                             \
1194   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1195                                                                             \
1196   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
1197                 "Percentage of used monitors before triggering cleanup "    \
1198                 "safepoint which deflates monitors (0 is off). "            \
1199                 "The check is performed on GuaranteedSafepointInterval.")   \
1200                 range(0, 100)                                               \
1201                                                                             \
1202   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1203                "Experimental Sync flags")                                   \
1204                                                                             \
1205   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1206                                                                             \
1207   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1208                                                                             \
1209   experimental(intx, hashCode, 5,                                           \
1210                "(Unstable) select hashCode generation algorithm")           \
1211                                                                             \
1212   product(bool, FilterSpuriousWakeups, true,                                \
1213           "When true prevents OS-level spurious, or premature, wakeups "    \
1214           "from Object.wait (Ignored for Windows)")                         \
1215                                                                             \
1216   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1217                                                                             \
1218   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1219                                                                             \
1220   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1221                                                                             \
1222   develop(bool, UsePthreads, false,                                         \
1223           "Use pthread-based instead of libthread-based synchronization "   \
1224           "(SPARC only)")                                                   \
1225                                                                             \
1226   product(bool, ReduceSignalUsage, false,                                   \
1227           "Reduce the use of OS signals in Java and/or the VM")             \
1228                                                                             \
1229   develop_pd(bool, ShareVtableStubs,                                        \
1230           "Share vtable stubs (smaller code but worse branch prediction")   \
1231                                                                             \
1232   develop(bool, LoadLineNumberTables, true,                                 \
1233           "Tell whether the class file parser loads line number tables")    \
1234                                                                             \
1235   develop(bool, LoadLocalVariableTables, true,                              \
1236           "Tell whether the class file parser loads local variable tables") \
1237                                                                             \
1238   develop(bool, LoadLocalVariableTypeTables, true,                          \
1239           "Tell whether the class file parser loads local variable type"    \
1240           "tables")                                                         \
1241                                                                             \
1242   product(bool, AllowUserSignalHandlers, false,                             \
1243           "Do not complain if the application installs signal handlers "    \
1244           "(Solaris & Linux only)")                                         \
1245                                                                             \
1246   product(bool, UseSignalChaining, true,                                    \
1247           "Use signal-chaining to invoke signal handlers installed "        \
1248           "by the application (Solaris & Linux only)")                      \
1249                                                                             \
1250   product(bool, AllowJNIEnvProxy, false,                                    \
1251           "Allow JNIEnv proxies for jdbx")                                  \
1252                                                                             \
1253   product(bool, RestoreMXCSROnJNICalls, false,                              \
1254           "Restore MXCSR when returning from JNI calls")                    \
1255                                                                             \
1256   product(bool, CheckJNICalls, false,                                       \
1257           "Verify all arguments to JNI calls")                              \
1258                                                                             \
1259   product(bool, CheckEndorsedAndExtDirs, false,                             \
1260           "Verify the endorsed and extension directories are not used")     \
1261                                                                             \
1262   product(bool, UseFastJNIAccessors, true,                                  \
1263           "Use optimized versions of Get<Primitive>Field")                  \
1264                                                                             \
1265   product(intx, MaxJNILocalCapacity, 65536,                                 \
1266           "Maximum allowable local JNI handle capacity to "                 \
1267           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1268           "where <= 0 is unlimited, default: 65536")                        \
1269           range(min_intx, max_intx)                                         \
1270                                                                             \
1271   product(bool, EagerXrunInit, false,                                       \
1272           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1273           "but not all -Xrun libraries may support the state of the VM "    \
1274           "at this time")                                                   \
1275                                                                             \
1276   product(bool, PreserveAllAnnotations, false,                              \
1277           "Preserve RuntimeInvisibleAnnotations as well "                   \
1278           "as RuntimeVisibleAnnotations")                                   \
1279                                                                             \
1280   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1281           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1282                                                                             \
1283   product(bool, UseXMMForArrayCopy, false,                                  \
1284           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1285                                                                             \
1286   product(intx, FieldsAllocationStyle, 1,                                   \
1287           "0 - type based with oops first, "                                \
1288           "1 - with oops last, "                                            \
1289           "2 - oops in super and sub classes are together")                 \
1290           range(0, 2)                                                       \
1291                                                                             \
1292   product(bool, CompactFields, true,                                        \
1293           "Allocate nonstatic fields in gaps between previous fields")      \
1294                                                                             \
1295   notproduct(bool, PrintFieldLayout, false,                                 \
1296           "Print field layout for each class")                              \
1297                                                                             \
1298   /* Need to limit the extent of the padding to reasonable size.          */\
1299   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1300   /* aggressive prefetching, while still leaving the room for segregating */\
1301   /* among the distinct pages.                                            */\
1302   product(intx, ContendedPaddingWidth, 128,                                 \
1303           "How many bytes to pad the fields/classes marked @Contended with")\
1304           range(0, 8192)                                                    \
1305           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1306                                                                             \
1307   product(bool, EnableContended, true,                                      \
1308           "Enable @Contended annotation support")                           \
1309                                                                             \
1310   product(bool, RestrictContended, true,                                    \
1311           "Restrict @Contended to trusted classes")                         \
1312                                                                             \
1313   product(bool, UseBiasedLocking, true,                                     \
1314           "Enable biased locking in JVM")                                   \
1315                                                                             \
1316   product(intx, BiasedLockingStartupDelay, 0,                               \
1317           "Number of milliseconds to wait before enabling biased locking")  \
1318           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1319           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1320                                                                             \
1321   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1322           "Print statistics of biased locking in JVM")                      \
1323                                                                             \
1324   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1325           "Threshold of number of revocations per type to try to "          \
1326           "rebias all objects in the heap of that type")                    \
1327           range(0, max_intx)                                                \
1328           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1329                                                                             \
1330   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1331           "Threshold of number of revocations per type to permanently "     \
1332           "revoke biases of all objects in the heap of that type")          \
1333           range(0, max_intx)                                                \
1334           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1335                                                                             \
1336   product(intx, BiasedLockingDecayTime, 25000,                              \
1337           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1338           "type after previous bulk rebias")                                \
1339           range(500, max_intx)                                              \
1340           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1341                                                                             \
1342   product(bool, ExitOnOutOfMemoryError, false,                              \
1343           "JVM exits on the first occurrence of an out-of-memory error")    \
1344                                                                             \
1345   product(bool, CrashOnOutOfMemoryError, false,                             \
1346           "JVM aborts, producing an error log and core/mini dump, on the "  \
1347           "first occurrence of an out-of-memory error")                     \
1348                                                                             \
1349   /* tracing */                                                             \
1350                                                                             \
1351   develop(bool, StressRewriter, false,                                      \
1352           "Stress linktime bytecode rewriting")                             \
1353                                                                             \
1354   product(ccstr, TraceJVMTI, NULL,                                          \
1355           "Trace flags for JVMTI functions and events")                     \
1356                                                                             \
1357   /* This option can change an EMCP method into an obsolete method. */      \
1358   /* This can affect tests that except specific methods to be EMCP. */      \
1359   /* This option should be used with caution.                       */      \
1360   product(bool, StressLdcRewrite, false,                                    \
1361           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1362                                                                             \
1363   /* change to false by default sometime after Mustang */                   \
1364   product(bool, VerifyMergedCPBytecodes, true,                              \
1365           "Verify bytecodes after RedefineClasses constant pool merging")   \
1366                                                                             \
1367   develop(bool, TraceBytecodes, false,                                      \
1368           "Trace bytecode execution")                                       \
1369                                                                             \
1370   develop(bool, TraceICs, false,                                            \
1371           "Trace inline cache changes")                                     \
1372                                                                             \
1373   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1374           "Trace method invocation counter overflow")                       \
1375                                                                             \
1376   develop(bool, TraceInlineCacheClearing, false,                            \
1377           "Trace clearing of inline caches in nmethods")                    \
1378                                                                             \
1379   develop(bool, TraceDependencies, false,                                   \
1380           "Trace dependencies")                                             \
1381                                                                             \
1382   develop(bool, VerifyDependencies, trueInDebug,                            \
1383           "Exercise and verify the compilation dependency mechanism")       \
1384                                                                             \
1385   develop(bool, TraceNewOopMapGeneration, false,                            \
1386           "Trace OopMapGeneration")                                         \
1387                                                                             \
1388   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1389           "Trace OopMapGeneration: print detailed cell states")             \
1390                                                                             \
1391   develop(bool, TimeOopMap, false,                                          \
1392           "Time calls to GenerateOopMap::compute_map() in sum")             \
1393                                                                             \
1394   develop(bool, TimeOopMap2, false,                                         \
1395           "Time calls to GenerateOopMap::compute_map() individually")       \
1396                                                                             \
1397   develop(bool, TraceOopMapRewrites, false,                                 \
1398           "Trace rewriting of method oops during oop map generation")       \
1399                                                                             \
1400   develop(bool, TraceICBuffer, false,                                       \
1401           "Trace usage of IC buffer")                                       \
1402                                                                             \
1403   develop(bool, TraceCompiledIC, false,                                     \
1404           "Trace changes of compiled IC")                                   \
1405                                                                             \
1406   /* gc */                                                                  \
1407                                                                             \
1408   product(bool, UseSerialGC, false,                                         \
1409           "Use the Serial garbage collector")                               \
1410                                                                             \
1411   product(bool, UseG1GC, false,                                             \
1412           "Use the Garbage-First garbage collector")                        \
1413                                                                             \
1414   product(bool, UseParallelGC, false,                                       \
1415           "Use the Parallel Scavenge garbage collector")                    \
1416                                                                             \
1417   product(bool, UseParallelOldGC, false,                                    \
1418           "Use the Parallel Old garbage collector")                         \
1419                                                                             \
1420   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1421           "How often should we maximally compact the heap (not allowing "   \
1422           "any dead space)")                                                \
1423           range(0, max_uintx)                                               \
1424                                                                             \
1425   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1426           "The collection count for the first maximum compaction")          \
1427           range(0, max_uintx)                                               \
1428                                                                             \
1429   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1430           "Use maximum compaction in the Parallel Old garbage collector "   \
1431           "for a system GC")                                                \
1432                                                                             \
1433   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1434           "The mean used by the parallel compact dead wood "                \
1435           "limiter (a number between 0-100)")                               \
1436           range(0, 100)                                                     \
1437                                                                             \
1438   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1439           "The standard deviation used by the parallel compact dead wood "  \
1440           "limiter (a number between 0-100)")                               \
1441           range(0, 100)                                                     \
1442                                                                             \
1443   product(uint, ParallelGCThreads, 0,                                       \
1444           "Number of parallel threads parallel gc will use")                \
1445           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1446                                                                             \
1447   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1448             "Use semaphore synchronization for the GC Threads, "            \
1449             "instead of synchronization based on mutexes")                  \
1450                                                                             \
1451   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1452           "Dynamically choose the number of parallel threads "              \
1453           "parallel gc will use")                                           \
1454                                                                             \
1455   diagnostic(bool, InjectGCWorkerCreationFailure, false,                    \
1456              "Inject thread creation failures for "                         \
1457              "UseDynamicNumberOfGCThreads")                                 \
1458                                                                             \
1459   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1460           "Force dynamic selection of the number of "                       \
1461           "parallel threads parallel gc will use to aid debugging")         \
1462                                                                             \
1463   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1464           "Size of heap (bytes) per GC thread used in calculating the "     \
1465           "number of GC threads")                                           \
1466           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1467                                                                             \
1468   product(uint, ConcGCThreads, 0,                                           \
1469           "Number of threads concurrent gc will use")                       \
1470           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1471                                                                             \
1472   product(uint, GCTaskTimeStampEntries, 200,                                \
1473           "Number of time stamp entries per gc worker thread")              \
1474           range(1, max_jint)                                                \
1475                                                                             \
1476   product(bool, AlwaysTenure, false,                                        \
1477           "Always tenure objects in eden (ParallelGC only)")                \
1478                                                                             \
1479   product(bool, NeverTenure, false,                                         \
1480           "Never tenure objects in eden, may tenure on overflow "           \
1481           "(ParallelGC only)")                                              \
1482                                                                             \
1483   product(bool, ScavengeBeforeFullGC, true,                                 \
1484           "Scavenge youngest generation before each full GC.")              \
1485                                                                             \
1486   product(bool, UseConcMarkSweepGC, false,                                  \
1487           "Use Concurrent Mark-Sweep GC in the old generation")             \
1488                                                                             \
1489   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1490           "A System.gc() request invokes a concurrent collection; "         \
1491           "(effective only when using concurrent collectors)")              \
1492                                                                             \
1493   product(bool, GCLockerInvokesConcurrent, false,                           \
1494           "The exit of a JNI critical section necessitating a scavenge, "   \
1495           "also kicks off a background concurrent collection")              \
1496                                                                             \
1497   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1498           "How much the GC can expand the eden by while the GC locker "     \
1499           "is active (as a percentage)")                                    \
1500           range(0, 100)                                                     \
1501                                                                             \
1502   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1503           "Number of times to retry allocations when "                      \
1504           "blocked by the GC locker")                                       \
1505           range(0, max_uintx)                                               \
1506                                                                             \
1507   product(bool, UseCMSBestFit, true,                                        \
1508           "Use CMS best fit allocation strategy")                           \
1509                                                                             \
1510   product(uintx, ParallelGCBufferWastePct, 10,                              \
1511           "Wasted fraction of parallel allocation buffer")                  \
1512           range(0, 100)                                                     \
1513                                                                             \
1514   product(uintx, TargetPLABWastePct, 10,                                    \
1515           "Target wasted space in last buffer as percent of overall "       \
1516           "allocation")                                                     \
1517           range(1, 100)                                                     \
1518                                                                             \
1519   product(uintx, PLABWeight, 75,                                            \
1520           "Percentage (0-100) used to weight the current sample when "      \
1521           "computing exponentially decaying average for ResizePLAB")        \
1522           range(0, 100)                                                     \
1523                                                                             \
1524   product(bool, ResizePLAB, true,                                           \
1525           "Dynamically resize (survivor space) promotion LAB's")            \
1526                                                                             \
1527   product(int, ParGCArrayScanChunk, 50,                                     \
1528           "Scan a subset of object array and push remainder, if array is "  \
1529           "bigger than this")                                               \
1530           range(1, max_jint/3)                                              \
1531                                                                             \
1532   product(bool, ParGCUseLocalOverflow, false,                               \
1533           "Instead of a global overflow list, use local overflow stacks")   \
1534                                                                             \
1535   product(bool, ParGCTrimOverflow, true,                                    \
1536           "Eagerly trim the local overflow lists "                          \
1537           "(when ParGCUseLocalOverflow)")                                   \
1538                                                                             \
1539   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1540           "Simulate work queue overflow in ParNew")                         \
1541                                                                             \
1542   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1543           "An `interval' counter that determines how frequently "           \
1544           "we simulate overflow; a smaller number increases frequency")     \
1545                                                                             \
1546   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1547           "The desired number of objects to claim from the overflow list")  \
1548           range(0, max_uintx)                                               \
1549                                                                             \
1550   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1551           "The number of strides per worker thread that we divide up the "  \
1552           "card table scanning work into")                                  \
1553           range(1, max_uintx)                                               \
1554           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1555                                                                             \
1556   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1557           "The number of cards in each chunk of the parallel chunks used "  \
1558           "during card table scanning")                                     \
1559           range(1, max_intx)                                                \
1560           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1561                                                                             \
1562   product(uintx, OldPLABWeight, 50,                                         \
1563           "Percentage (0-100) used to weight the current sample when "      \
1564           "computing exponentially decaying average for resizing "          \
1565           "OldPLABSize")                                                    \
1566           range(0, 100)                                                     \
1567                                                                             \
1568   product(bool, ResizeOldPLAB, true,                                        \
1569           "Dynamically resize (old gen) promotion LAB's")                   \
1570                                                                             \
1571   product(size_t, CMSOldPLABMax, 1024,                                      \
1572           "Maximum size of CMS gen promotion LAB caches per worker "        \
1573           "per block size")                                                 \
1574           range(1, max_uintx)                                               \
1575           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1576                                                                             \
1577   product(size_t, CMSOldPLABMin, 16,                                        \
1578           "Minimum size of CMS gen promotion LAB caches per worker "        \
1579           "per block size")                                                 \
1580           range(1, max_uintx)                                               \
1581           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1582                                                                             \
1583   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1584           "Nominal number of refills of CMS gen promotion LAB cache "       \
1585           "per worker per block size")                                      \
1586           range(1, max_uintx)                                               \
1587                                                                             \
1588   product(bool, CMSOldPLABResizeQuicker, false,                             \
1589           "React on-the-fly during a scavenge to a sudden "                 \
1590           "change in block demand rate")                                    \
1591                                                                             \
1592   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1593           "The tolerance of the phase-change detector for on-the-fly "      \
1594           "PLAB resizing during a scavenge")                                \
1595           range(1, max_uintx)                                               \
1596                                                                             \
1597   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1598           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1599           "during a scavenge")                                              \
1600           range(1, max_uintx)                                               \
1601                                                                             \
1602   product(bool, AlwaysPreTouch, false,                                      \
1603           "Force all freshly committed pages to be pre-touched")            \
1604                                                                             \
1605   product(size_t, PreTouchParallelChunkSize, 1 * G,                         \
1606           "Per-thread chunk size for parallel memory pre-touch.")           \
1607           range(1, SIZE_MAX / 2)                                            \
1608                                                                             \
1609   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1610           "The maximum size of young gen chosen by default per GC worker "  \
1611           "thread available")                                               \
1612           range(1, max_uintx)                                               \
1613                                                                             \
1614   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1615           "Percentage (0-100) used to add conservatism when computing the " \
1616           "duty cycle")                                                     \
1617           range(0, 100)                                                     \
1618                                                                             \
1619   product(uintx, CMSExpAvgFactor, 50,                                       \
1620           "Percentage (0-100) used to weight the current sample when "      \
1621           "computing exponential averages for CMS statistics")              \
1622           range(0, 100)                                                     \
1623                                                                             \
1624   product(uintx, CMS_FLSWeight, 75,                                         \
1625           "Percentage (0-100) used to weight the current sample when "      \
1626           "computing exponentially decaying averages for CMS FLS "          \
1627           "statistics")                                                     \
1628           range(0, 100)                                                     \
1629                                                                             \
1630   product(uintx, CMS_FLSPadding, 1,                                         \
1631           "The multiple of deviation from mean to use for buffering "       \
1632           "against volatility in free list demand")                         \
1633           range(0, max_juint)                                               \
1634                                                                             \
1635   product(uintx, FLSCoalescePolicy, 2,                                      \
1636           "CMS: aggressiveness level for coalescing, increasing "           \
1637           "from 0 to 4")                                                    \
1638           range(0, 4)                                                       \
1639                                                                             \
1640   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1641           "CMS: larger free blocks are always available for coalescing")    \
1642                                                                             \
1643   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1644           "CMS: the smaller the percentage the greater the coalescing "     \
1645           "force")                                                          \
1646           range(0.0, 1.0)                                                   \
1647                                                                             \
1648   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1649           "CMS: the factor by which to inflate estimated demand of small "  \
1650           "block sizes to prevent coalescing with an adjoining block")      \
1651           range(0.0, DBL_MAX)                                               \
1652                                                                             \
1653   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1654           "CMS: the factor by which to inflate estimated demand of large "  \
1655           "block sizes to prevent coalescing with an adjoining block")      \
1656           range(0.0, DBL_MAX)                                               \
1657                                                                             \
1658   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1659           "CMS: the factor by which to inflate estimated demand of small "  \
1660           "block sizes to prevent splitting to supply demand for smaller "  \
1661           "blocks")                                                         \
1662           range(0.0, DBL_MAX)                                               \
1663                                                                             \
1664   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1665           "CMS: the factor by which to inflate estimated demand of large "  \
1666           "block sizes to prevent splitting to supply demand for smaller "  \
1667           "blocks")                                                         \
1668           range(0.0, DBL_MAX)                                               \
1669                                                                             \
1670   product(bool, CMSExtrapolateSweep, false,                                 \
1671           "CMS: cushion for block demand during sweep")                     \
1672                                                                             \
1673   product(uintx, CMS_SweepWeight, 75,                                       \
1674           "Percentage (0-100) used to weight the current sample when "      \
1675           "computing exponentially decaying average for inter-sweep "       \
1676           "duration")                                                       \
1677           range(0, 100)                                                     \
1678                                                                             \
1679   product(uintx, CMS_SweepPadding, 1,                                       \
1680           "The multiple of deviation from mean to use for buffering "       \
1681           "against volatility in inter-sweep duration")                     \
1682           range(0, max_juint)                                               \
1683                                                                             \
1684   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1685           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1686           "duration exceeds this threshold in milliseconds")                \
1687           range(0, max_uintx)                                               \
1688                                                                             \
1689   product(bool, CMSClassUnloadingEnabled, true,                             \
1690           "Whether class unloading enabled when using CMS GC")              \
1691                                                                             \
1692   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1693           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1694           "count for which classes may not be unloaded")                    \
1695           range(0, max_uintx)                                               \
1696                                                                             \
1697   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1698           "Replenish an indexed free list with this number of chunks")      \
1699           range(1, max_uintx)                                               \
1700                                                                             \
1701   product(bool, CMSReplenishIntermediate, true,                             \
1702           "Replenish all intermediate free-list caches")                    \
1703                                                                             \
1704   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1705           "When satisfying batched demand, split blocks from the "          \
1706           "IndexedFreeList whose size is a multiple of requested size")     \
1707                                                                             \
1708   product(bool, CMSLoopWarn, false,                                         \
1709           "Warn in case of excessive CMS looping")                          \
1710                                                                             \
1711   /* where does the range max value of (max_jint - 1) come from? */         \
1712   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1713           "Maximum size of marking stack")                                  \
1714           range(1, (max_jint - 1))                                          \
1715                                                                             \
1716   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1717           "Size of marking stack")                                          \
1718           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1719                                                                             \
1720   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1721           "Simulate frequent marking stack / work queue overflow")          \
1722                                                                             \
1723   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1724           "An \"interval\" counter that determines how frequently "         \
1725           "to simulate overflow; a smaller number increases frequency")     \
1726                                                                             \
1727   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1728           "Maximum number of abortable preclean iterations, if > 0")        \
1729           range(0, max_uintx)                                               \
1730                                                                             \
1731   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1732           "Maximum time in abortable preclean (in milliseconds)")           \
1733           range(0, max_intx)                                                \
1734                                                                             \
1735   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1736           "Nominal minimum work per abortable preclean iteration")          \
1737           range(0, max_uintx)                                               \
1738                                                                             \
1739   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1740           "Time that we sleep between iterations when not given "           \
1741           "enough work per iteration")                                      \
1742           range(0, max_intx)                                                \
1743                                                                             \
1744   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1745   product(size_t, CMSRescanMultiple, 32,                                    \
1746           "Size (in cards) of CMS parallel rescan task")                    \
1747           range(1, SIZE_MAX / 4096)                                         \
1748           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1749                                                                             \
1750   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1751   product(size_t, CMSConcMarkMultiple, 32,                                  \
1752           "Size (in cards) of CMS concurrent MT marking task")              \
1753           range(1, SIZE_MAX / 4096)                                         \
1754           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1755                                                                             \
1756   product(bool, CMSAbortSemantics, false,                                   \
1757           "Whether abort-on-overflow semantics is implemented")             \
1758                                                                             \
1759   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1760           "Use the parallel initial mark.")                                 \
1761                                                                             \
1762   product(bool, CMSParallelRemarkEnabled, true,                             \
1763           "Whether parallel remark enabled (only if ParNewGC)")             \
1764                                                                             \
1765   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1766           "Whether parallel remark of survivor space "                      \
1767           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1768                                                                             \
1769   product(bool, CMSPLABRecordAlways, true,                                  \
1770           "Always record survivor space PLAB boundaries (effective only "   \
1771           "if CMSParallelSurvivorRemarkEnabled)")                           \
1772                                                                             \
1773   product(bool, CMSEdenChunksRecordAlways, true,                            \
1774           "Always record eden chunks used for the parallel initial mark "   \
1775           "or remark of eden")                                              \
1776                                                                             \
1777   product(bool, CMSConcurrentMTEnabled, true,                               \
1778           "Whether multi-threaded concurrent work enabled "                 \
1779           "(effective only if ParNewGC)")                                   \
1780                                                                             \
1781   product(bool, CMSPrecleaningEnabled, true,                                \
1782           "Whether concurrent precleaning enabled")                         \
1783                                                                             \
1784   product(uintx, CMSPrecleanIter, 3,                                        \
1785           "Maximum number of precleaning iteration passes")                 \
1786           range(0, 9)                                                       \
1787                                                                             \
1788   product(uintx, CMSPrecleanDenominator, 3,                                 \
1789           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1790           "ratio")                                                          \
1791           range(1, max_uintx)                                               \
1792           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1793                                                                             \
1794   product(uintx, CMSPrecleanNumerator, 2,                                   \
1795           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1796           "ratio")                                                          \
1797           range(0, max_uintx-1)                                             \
1798           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1799                                                                             \
1800   product(bool, CMSPrecleanRefLists1, true,                                 \
1801           "Preclean ref lists during (initial) preclean phase")             \
1802                                                                             \
1803   product(bool, CMSPrecleanRefLists2, false,                                \
1804           "Preclean ref lists during abortable preclean phase")             \
1805                                                                             \
1806   product(bool, CMSPrecleanSurvivors1, false,                               \
1807           "Preclean survivors during (initial) preclean phase")             \
1808                                                                             \
1809   product(bool, CMSPrecleanSurvivors2, true,                                \
1810           "Preclean survivors during abortable preclean phase")             \
1811                                                                             \
1812   product(uintx, CMSPrecleanThreshold, 1000,                                \
1813           "Do not iterate again if number of dirty cards is less than this")\
1814           range(100, max_uintx)                                             \
1815                                                                             \
1816   product(bool, CMSCleanOnEnter, true,                                      \
1817           "Clean-on-enter optimization for reducing number of dirty cards") \
1818                                                                             \
1819   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1820           "Choose variant (1,2) of verification following remark")          \
1821           range(1, 2)                                                       \
1822                                                                             \
1823   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1824           "If Eden size is below this, do not try to schedule remark")      \
1825           range(0, max_uintx)                                               \
1826                                                                             \
1827   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1828           "The Eden occupancy percentage (0-100) at which "                 \
1829           "to try and schedule remark pause")                               \
1830           range(0, 100)                                                     \
1831                                                                             \
1832   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1833           "Start sampling eden top at least before young gen "              \
1834           "occupancy reaches 1/<ratio> of the size at which "               \
1835           "we plan to schedule remark")                                     \
1836           range(1, max_uintx)                                               \
1837                                                                             \
1838   product(uintx, CMSSamplingGrain, 16*K,                                    \
1839           "The minimum distance between eden samples for CMS (see above)")  \
1840           range(ObjectAlignmentInBytes, max_uintx)                          \
1841           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1842                                                                             \
1843   product(bool, CMSScavengeBeforeRemark, false,                             \
1844           "Attempt scavenge before the CMS remark step")                    \
1845                                                                             \
1846   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1847           "Don't drain below this size per parallel worker/thief")          \
1848           range(1, max_juint)                                               \
1849           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1850                                                                             \
1851   manageable(intx, CMSWaitDuration, 2000,                                   \
1852           "Time in milliseconds that CMS thread waits for young GC")        \
1853           range(min_jint, max_jint)                                         \
1854                                                                             \
1855   develop(uintx, CMSCheckInterval, 1000,                                    \
1856           "Interval in milliseconds that CMS thread checks if it "          \
1857           "should start a collection cycle")                                \
1858                                                                             \
1859   product(bool, CMSYield, true,                                             \
1860           "Yield between steps of CMS")                                     \
1861                                                                             \
1862   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1863           "Bitmap operations should process at most this many bits "        \
1864           "between yields")                                                 \
1865           range(1, max_uintx)                                               \
1866           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1867                                                                             \
1868   product(bool, CMSPrintChunksInDump, false,                                \
1869           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1870           "trace level include more detailed information about the"         \
1871           "free chunks")                \
1872                                                                             \
1873   product(bool, CMSPrintObjectsInDump, false,                               \
1874           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1875           "trace level include more detailed information about the"         \
1876           "allocated objects")                                              \
1877                                                                             \
1878   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1879           "Verify that all references across the FLS boundary "             \
1880           "are to valid objects")                                           \
1881                                                                             \
1882   diagnostic(bool, FLSVerifyLists, false,                                   \
1883           "Do lots of (expensive) FreeListSpace verification")              \
1884                                                                             \
1885   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1886           "Do lots of (expensive) FLS index table verification")            \
1887                                                                             \
1888   develop(bool, FLSVerifyDictionary, false,                                 \
1889           "Do lots of (expensive) FLS dictionary verification")             \
1890                                                                             \
1891   develop(bool, VerifyBlockOffsetArray, false,                              \
1892           "Do (expensive) block offset array verification")                 \
1893                                                                             \
1894   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1895           "Maintain _unallocated_block in BlockOffsetArray "                \
1896           "(currently applicable only to CMS collector)")                   \
1897                                                                             \
1898   product(intx, RefDiscoveryPolicy, 0,                                      \
1899           "Select type of reference discovery policy: "                     \
1900           "reference-based(0) or referent-based(1)")                        \
1901           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1902                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1903                                                                             \
1904   product(bool, ParallelRefProcEnabled, false,                              \
1905           "Enable parallel reference processing whenever possible")         \
1906                                                                             \
1907   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1908           "Enable balancing of reference processing queues")                \
1909                                                                             \
1910   product(uintx, CMSTriggerRatio, 80,                                       \
1911           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1912           "allocated before a CMS collection cycle commences")              \
1913           range(0, 100)                                                     \
1914                                                                             \
1915   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1916           "Percentage CMS generation occupancy at which to "                \
1917           "initiate CMS collection for bootstrapping collection stats")     \
1918           range(0, 100)                                                     \
1919                                                                             \
1920   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1921           "Percentage CMS generation occupancy to start a CMS collection "  \
1922           "cycle. A negative value means that CMSTriggerRatio is used")     \
1923           range(min_intx, 100)                                              \
1924                                                                             \
1925   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1926           "The percent occupancy (IHOP) of the current old generation "     \
1927           "capacity above which a concurrent mark cycle will be initiated " \
1928           "Its value may change over time if adaptive IHOP is enabled, "    \
1929           "otherwise the value remains constant. "                          \
1930           "In the latter case a value of 0 will result as frequent as "     \
1931           "possible concurrent marking cycles. A value of 100 disables "    \
1932           "concurrent marking. "                                            \
1933           "Fragmentation waste in the old generation is not considered "    \
1934           "free space in this calculation. (G1 collector only)")            \
1935           range(0, 100)                                                     \
1936                                                                             \
1937   manageable(intx, CMSTriggerInterval, -1,                                  \
1938           "Commence a CMS collection cycle (at least) every so many "       \
1939           "milliseconds (0 permanently, -1 disabled)")                      \
1940           range(-1, max_intx)                                               \
1941                                                                             \
1942   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1943           "Only use occupancy as a criterion for starting a CMS collection")\
1944                                                                             \
1945   product(uintx, CMSIsTooFullPercentage, 98,                                \
1946           "An absolute ceiling above which CMS will always consider the "   \
1947           "unloading of classes when class unloading is enabled")           \
1948           range(0, 100)                                                     \
1949                                                                             \
1950   develop(bool, CMSTestInFreeList, false,                                   \
1951           "Check if the coalesced range is already in the "                 \
1952           "free lists as claimed")                                          \
1953                                                                             \
1954   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1955           "Check that all the garbage collected was returned to the "       \
1956           "free lists")                                                     \
1957                                                                             \
1958   notproduct(bool, ScavengeALot, false,                                     \
1959           "Force scavenge at every Nth exit from the runtime system "       \
1960           "(N=ScavengeALotInterval)")                                       \
1961                                                                             \
1962   develop(bool, FullGCALot, false,                                          \
1963           "Force full gc at every Nth exit from the runtime system "        \
1964           "(N=FullGCALotInterval)")                                         \
1965                                                                             \
1966   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1967           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1968                                                                             \
1969   notproduct(bool, PromotionFailureALot, false,                             \
1970           "Use promotion failure handling on every youngest generation "    \
1971           "collection")                                                     \
1972                                                                             \
1973   develop(uintx, PromotionFailureALotCount, 1000,                           \
1974           "Number of promotion failures occurring at PLAB "                 \
1975           "refill attempts (ParNew) or promotion attempts "                 \
1976           "(other young collectors)")                                       \
1977                                                                             \
1978   develop(uintx, PromotionFailureALotInterval, 5,                           \
1979           "Total collections between promotion failures a lot")             \
1980                                                                             \
1981   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1982           "Sleep time when sleep is used for yields")                       \
1983                                                                             \
1984   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1985           "Number of yields before a sleep is done during work stealing")   \
1986                                                                             \
1987   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1988           "Number of iterations in a spin loop between checks on "          \
1989           "time out of hard spin")                                          \
1990                                                                             \
1991   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1992           "Ratio of hard spins to calls to yield")                          \
1993                                                                             \
1994   develop(uintx, ObjArrayMarkingStride, 2048,                               \
1995           "Number of object array elements to push onto the marking stack " \
1996           "before pushing a continuation entry")                            \
1997                                                                             \
1998   develop(bool, MetadataAllocationFailALot, false,                          \
1999           "Fail metadata allocations at intervals controlled by "           \
2000           "MetadataAllocationFailALotInterval")                             \
2001                                                                             \
2002   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2003           "Metadata allocation failure a lot interval")                     \
2004                                                                             \
2005   notproduct(bool, ExecuteInternalVMTests, false,                           \
2006           "Enable execution of internal VM tests")                          \
2007                                                                             \
2008   notproduct(bool, VerboseInternalVMTests, false,                           \
2009           "Turn on logging for internal VM tests.")                         \
2010                                                                             \
2011   product(bool, ExecutingUnitTests, false,                                  \
2012           "Whether the JVM is running unit tests or not")                   \
2013                                                                             \
2014   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2015                                                                             \
2016   product_pd(bool, ResizeTLAB,                                              \
2017           "Dynamically resize TLAB size for threads")                       \
2018                                                                             \
2019   product(bool, ZeroTLAB, false,                                            \
2020           "Zero out the newly created TLAB")                                \
2021                                                                             \
2022   product(bool, FastTLABRefill, true,                                       \
2023           "Use fast TLAB refill code")                                      \
2024                                                                             \
2025   product(bool, TLABStats, true,                                            \
2026           "Provide more detailed and expensive TLAB statistics.")           \
2027                                                                             \
2028   product_pd(bool, NeverActAsServerClassMachine,                            \
2029           "Never act like a server-class machine")                          \
2030                                                                             \
2031   product(bool, AlwaysActAsServerClassMachine, false,                       \
2032           "Always act like a server-class machine")                         \
2033                                                                             \
2034   product_pd(uint64_t, MaxRAM,                                              \
2035           "Real memory size (in bytes) used to set maximum heap size")      \
2036           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2037                                                                             \
2038   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2039           "Maximum ergonomically set heap size (in bytes); zero means use " \
2040           "MaxRAM * MaxRAMPercentage / 100")                                \
2041           range(0, max_uintx)                                               \
2042                                                                             \
2043   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2044           "Use CGroup memory limit as physical memory limit for heap "      \
2045           "sizing")                                                         \
2046                                                                             \
2047   product(uintx, MaxRAMFraction, 4,                                         \
2048           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2049           "size. "                                                          \
2050           "Deprecated, use MaxRAMPercentage instead")                       \
2051           range(1, max_uintx)                                               \
2052                                                                             \
2053   product(uintx, MinRAMFraction, 2,                                         \
2054           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2055           "size on systems with small physical memory size. "               \
2056           "Deprecated, use MinRAMPercentage instead")                       \
2057           range(1, max_uintx)                                               \
2058                                                                             \
2059   product(uintx, InitialRAMFraction, 64,                                    \
2060           "Fraction (1/n) of real memory used for initial heap size. "      \
2061           "Deprecated, use InitialRAMPercentage instead")                   \
2062           range(1, max_uintx)                                               \
2063                                                                             \
2064   product(double, MaxRAMPercentage, 25.0,                                   \
2065           "Maximum percentage of real memory used for maximum heap size")   \
2066           range(0.0, 100.0)                                                 \
2067                                                                             \
2068   product(double, MinRAMPercentage, 50.0,                                   \
2069           "Minimum percentage of real memory used for maximum heap"         \
2070           "size on systems with small physical memory size")                \
2071           range(0.0, 100.0)                                                 \
2072                                                                             \
2073   product(double, InitialRAMPercentage, 1.5625,                             \
2074           "Percentage of real memory used for initial heap size")           \
2075           range(0.0, 100.0)                                                 \
2076                                                                             \
2077   develop(uintx, MaxVirtMemFraction, 2,                                     \
2078           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2079           "determining maximum heap size")                                  \
2080                                                                             \
2081   product(bool, UseAdaptiveSizePolicy, true,                                \
2082           "Use adaptive generation sizing policies")                        \
2083                                                                             \
2084   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2085           "Use adaptive survivor sizing policies")                          \
2086                                                                             \
2087   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2088           "Use adaptive young-old sizing policies at minor collections")    \
2089                                                                             \
2090   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2091           "Use adaptive young-old sizing policies at major collections")    \
2092                                                                             \
2093   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2094           "Include statistics from System.gc() for adaptive size policy")   \
2095                                                                             \
2096   product(bool, UseAdaptiveGCBoundary, false,                               \
2097           "Allow young-old boundary to move")                               \
2098                                                                             \
2099   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2100           "Resize the virtual spaces of the young or old generations")      \
2101           range(-1, 1)                                                      \
2102                                                                             \
2103   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2104           "Policy for changing generation size for throughput goals")       \
2105           range(0, 1)                                                       \
2106                                                                             \
2107   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2108           "Number of steps where heuristics is used before data is used")   \
2109           range(0, max_uintx)                                               \
2110                                                                             \
2111   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2112           "Number of collections before the adaptive sizing is started")    \
2113                                                                             \
2114   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2115           "Collection interval for printing information; zero means never") \
2116           range(0, max_uintx)                                               \
2117                                                                             \
2118   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2119           "Use adaptive minimum footprint as a goal")                       \
2120                                                                             \
2121   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2122           "Weight given to exponential resizing, between 0 and 100")        \
2123           range(0, 100)                                                     \
2124                                                                             \
2125   product(uintx, AdaptiveTimeWeight,       25,                              \
2126           "Weight given to time in adaptive policy, between 0 and 100")     \
2127           range(0, 100)                                                     \
2128                                                                             \
2129   product(uintx, PausePadding, 1,                                           \
2130           "How much buffer to keep for pause time")                         \
2131           range(0, max_juint)                                               \
2132                                                                             \
2133   product(uintx, PromotedPadding, 3,                                        \
2134           "How much buffer to keep for promotion failure")                  \
2135           range(0, max_juint)                                               \
2136                                                                             \
2137   product(uintx, SurvivorPadding, 3,                                        \
2138           "How much buffer to keep for survivor overflow")                  \
2139           range(0, max_juint)                                               \
2140                                                                             \
2141   product(uintx, ThresholdTolerance, 10,                                    \
2142           "Allowed collection cost difference between generations")         \
2143           range(0, 100)                                                     \
2144                                                                             \
2145   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2146           "If collection costs are within margin, reduce both by full "     \
2147           "delta")                                                          \
2148           range(0, 100)                                                     \
2149                                                                             \
2150   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2151           "Adaptive size percentage change in young generation")            \
2152           range(0, 100)                                                     \
2153                                                                             \
2154   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2155           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2156           range(0, 100)                                                     \
2157                                                                             \
2158   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2159           "Decay factor to YoungedGenerationSizeSupplement")                \
2160           range(1, max_uintx)                                               \
2161                                                                             \
2162   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2163           "Adaptive size percentage change in tenured generation")          \
2164           range(0, 100)                                                     \
2165                                                                             \
2166   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2167           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2168           range(0, 100)                                                     \
2169                                                                             \
2170   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2171           "Decay factor to TenuredGenerationSizeIncrement")                 \
2172           range(1, max_uintx)                                               \
2173                                                                             \
2174   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2175           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2176           "or (G1 Only) the maximum GC time per MMU time slice")            \
2177           range(1, max_uintx - 1)                                           \
2178           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2179                                                                             \
2180   product(uintx, GCPauseIntervalMillis, 0,                                  \
2181           "Time slice for MMU specification")                               \
2182           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2183                                                                             \
2184   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2185           "Adaptive size policy maximum GC minor pause time goal "          \
2186           "in millisecond")                                                 \
2187           range(0, max_uintx)                                               \
2188                                                                             \
2189   product(uintx, GCTimeRatio, 99,                                           \
2190           "Adaptive size policy application time to GC time ratio")         \
2191           range(0, max_juint)                                               \
2192                                                                             \
2193   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2194           "Adaptive size scale down factor for shrinking")                  \
2195           range(1, max_uintx)                                               \
2196                                                                             \
2197   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2198           "Adaptive size decays the major cost for long major intervals")   \
2199                                                                             \
2200   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2201           "Time scale over which major costs decay")                        \
2202           range(0, max_uintx)                                               \
2203                                                                             \
2204   product(uintx, MinSurvivorRatio, 3,                                       \
2205           "Minimum ratio of young generation/survivor space size")          \
2206           range(3, max_uintx)                                               \
2207                                                                             \
2208   product(uintx, InitialSurvivorRatio, 8,                                   \
2209           "Initial ratio of young generation/survivor space size")          \
2210           range(0, max_uintx)                                               \
2211                                                                             \
2212   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2213           "Estimate of footprint other than Java Heap")                     \
2214           range(0, max_uintx)                                               \
2215                                                                             \
2216   product(bool, UseGCOverheadLimit, true,                                   \
2217           "Use policy to limit of proportion of time spent in GC "          \
2218           "before an OutOfMemory error is thrown")                          \
2219                                                                             \
2220   product(uintx, GCTimeLimit, 98,                                           \
2221           "Limit of the proportion of time spent in GC before "             \
2222           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2223           range(0, 100)                                                     \
2224                                                                             \
2225   product(uintx, GCHeapFreeLimit, 2,                                        \
2226           "Minimum percentage of free space after a full GC before an "     \
2227           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2228           range(0, 100)                                                     \
2229                                                                             \
2230   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2231           "Number of consecutive collections before gc time limit fires")   \
2232           range(1, max_uintx)                                               \
2233                                                                             \
2234   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2235           "How far ahead to prefetch destination area (<= 0 means off)")    \
2236           range(-1, max_jint)                                               \
2237                                                                             \
2238   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2239           "How far ahead to prefetch scan area (<= 0 means off)")           \
2240           range(-1, max_jint)                                               \
2241                                                                             \
2242   product(intx, PrefetchFieldsAhead, -1,                                    \
2243           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2244           range(-1, max_jint)                                               \
2245                                                                             \
2246   diagnostic(bool, VerifyDuringStartup, false,                              \
2247           "Verify memory system before executing any Java code "            \
2248           "during VM initialization")                                       \
2249                                                                             \
2250   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2251           "Verify system before exiting")                                   \
2252                                                                             \
2253   diagnostic(bool, VerifyBeforeGC, false,                                   \
2254           "Verify memory system before GC")                                 \
2255                                                                             \
2256   diagnostic(bool, VerifyAfterGC, false,                                    \
2257           "Verify memory system after GC")                                  \
2258                                                                             \
2259   diagnostic(bool, VerifyDuringGC, false,                                   \
2260           "Verify memory system during GC (between phases)")                \
2261                                                                             \
2262   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2263           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2264           "are enabled. One or more sub-systems can be specified "          \
2265           "in a comma separated string. Sub-systems are: "                  \
2266           "threads, heap, symbol_table, string_table, codecache, "          \
2267           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2268           "codecache_oops")                                                 \
2269                                                                             \
2270   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2271           "Enable parallel memory system verification")                     \
2272                                                                             \
2273   diagnostic(bool, DeferInitialCardMark, false,                             \
2274           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2275           "may arise from new_pre_store_barrier")                           \
2276                                                                             \
2277   product(bool, UseCondCardMark, false,                                     \
2278           "Check for already marked card before updating card table")       \
2279                                                                             \
2280   diagnostic(bool, VerifyRememberedSets, false,                             \
2281           "Verify GC remembered sets")                                      \
2282                                                                             \
2283   diagnostic(bool, VerifyObjectStartArray, true,                            \
2284           "Verify GC object start array if verify before/after")            \
2285                                                                             \
2286   product(bool, DisableExplicitGC, false,                                   \
2287           "Ignore calls to System.gc()")                                    \
2288                                                                             \
2289   notproduct(bool, CheckMemoryInitialization, false,                        \
2290           "Check memory initialization")                                    \
2291                                                                             \
2292   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2293           "Bind CMS Thread to CPU if possible")                             \
2294                                                                             \
2295   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2296           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2297           range(0, max_juint)                                               \
2298                                                                             \
2299   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2300           "Bind GCTaskThreads to CPUs if possible")                         \
2301                                                                             \
2302   product(bool, UseGCTaskAffinity, false,                                   \
2303           "Use worker affinity when asking for GCTasks")                    \
2304                                                                             \
2305   product(uintx, ProcessDistributionStride, 4,                              \
2306           "Stride through processors when distributing processes")          \
2307           range(0, max_juint)                                               \
2308                                                                             \
2309   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2310           "Number of times the coordinator GC thread will sleep while "     \
2311           "yielding before giving up and resuming GC")                      \
2312           range(0, max_juint)                                               \
2313                                                                             \
2314   product(uintx, CMSYieldSleepCount, 0,                                     \
2315           "Number of times a GC thread (minus the coordinator) "            \
2316           "will sleep while yielding before giving up and resuming GC")     \
2317           range(0, max_juint)                                               \
2318                                                                             \
2319   product(bool, PrintGC, false,                                             \
2320           "Print message at garbage collection. "                           \
2321           "Deprecated, use -Xlog:gc instead.")                              \
2322                                                                             \
2323   product(bool, PrintGCDetails, false,                                      \
2324           "Print more details at garbage collection. "                      \
2325           "Deprecated, use -Xlog:gc* instead.")                             \
2326                                                                             \
2327   develop(intx, ConcGCYieldTimeout, 0,                                      \
2328           "If non-zero, assert that GC threads yield within this "          \
2329           "number of milliseconds")                                         \
2330           range(0, max_intx)                                                \
2331                                                                             \
2332   develop(bool, TraceFinalizerRegistration, false,                          \
2333           "Trace registration of final references")                         \
2334                                                                             \
2335   notproduct(bool, TraceScavenge, false,                                    \
2336           "Trace scavenge")                                                 \
2337                                                                             \
2338   product(bool, IgnoreEmptyClassPaths, false,                               \
2339           "Ignore empty path elements in -classpath")                       \
2340                                                                             \
2341   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2342           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2343           "Initial size of the boot class loader data metaspace")           \
2344           range(30*K, max_uintx/BytesPerWord)                               \
2345           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2346                                                                             \
2347   product(bool, TraceYoungGenTime, false,                                   \
2348           "Trace accumulated time for young collection")                    \
2349                                                                             \
2350   product(bool, TraceOldGenTime, false,                                     \
2351           "Trace accumulated time for old collection")                      \
2352                                                                             \
2353   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2354           "Print heap layout in response to SIGBREAK")                      \
2355                                                                             \
2356   manageable(bool, PrintClassHistogram, false,                              \
2357           "Print a histogram of class instances")                           \
2358                                                                             \
2359   develop(bool, TraceGCTaskManager, false,                                  \
2360           "Trace actions of the GC task manager")                           \
2361                                                                             \
2362   develop(bool, TraceGCTaskQueue, false,                                    \
2363           "Trace actions of the GC task queues")                            \
2364                                                                             \
2365   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2366           "Trace marking phase in ParallelOldGC")                           \
2367                                                                             \
2368   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2369           "Trace dense prefix computation for ParallelOldGC")               \
2370                                                                             \
2371   develop(bool, IgnoreLibthreadGPFault, false,                              \
2372           "Suppress workaround for libthread GP fault")                     \
2373                                                                             \
2374   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2375           "The percentage of the used heap that the instances of a class "  \
2376           "must occupy for the class to generate a trace event")            \
2377           range(0.0, 100.0)                                                 \
2378                                                                             \
2379   /* JVMTI heap profiling */                                                \
2380                                                                             \
2381   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2382           "Trace JVMTI object tagging calls")                               \
2383                                                                             \
2384   diagnostic(bool, VerifyBeforeIteration, false,                            \
2385           "Verify memory system before JVMTI iteration")                    \
2386                                                                             \
2387   /* compiler interface */                                                  \
2388                                                                             \
2389   develop(bool, CIPrintCompilerName, false,                                 \
2390           "when CIPrint is active, print the name of the active compiler")  \
2391                                                                             \
2392   diagnostic(bool, CIPrintCompileQueue, false,                              \
2393           "display the contents of the compile queue whenever a "           \
2394           "compilation is enqueued")                                        \
2395                                                                             \
2396   develop(bool, CIPrintRequests, false,                                     \
2397           "display every request for compilation")                          \
2398                                                                             \
2399   product(bool, CITime, false,                                              \
2400           "collect timing information for compilation")                     \
2401                                                                             \
2402   develop(bool, CITimeVerbose, false,                                       \
2403           "be more verbose in compilation timings")                         \
2404                                                                             \
2405   develop(bool, CITimeEach, false,                                          \
2406           "display timing information after each successful compilation")   \
2407                                                                             \
2408   develop(bool, CICountOSR, false,                                          \
2409           "use a separate counter when assigning ids to osr compilations")  \
2410                                                                             \
2411   develop(bool, CICompileNatives, true,                                     \
2412           "compile native methods if supported by the compiler")            \
2413                                                                             \
2414   develop_pd(bool, CICompileOSR,                                            \
2415           "compile on stack replacement methods if supported by the "       \
2416           "compiler")                                                       \
2417                                                                             \
2418   develop(bool, CIPrintMethodCodes, false,                                  \
2419           "print method bytecodes of the compiled code")                    \
2420                                                                             \
2421   develop(bool, CIPrintTypeFlow, false,                                     \
2422           "print the results of ciTypeFlow analysis")                       \
2423                                                                             \
2424   develop(bool, CITraceTypeFlow, false,                                     \
2425           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2426                                                                             \
2427   develop(intx, OSROnlyBCI, -1,                                             \
2428           "OSR only at this bci.  Negative values mean exclude that bci")   \
2429                                                                             \
2430   /* compiler */                                                            \
2431                                                                             \
2432   /* notice: the max range value here is max_jint, not max_intx  */         \
2433   /* because of overflow issue                                   */         \
2434   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2435           "Number of compiler threads to run")                              \
2436           range(0, max_jint)                                                \
2437           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
2438                                                                             \
2439   product(intx, CompilationPolicyChoice, 0,                                 \
2440           "which compilation policy (0-3)")                                 \
2441           range(0, 3)                                                       \
2442                                                                             \
2443   develop(bool, UseStackBanging, true,                                      \
2444           "use stack banging for stack overflow checks (required for "      \
2445           "proper StackOverflow handling; disable only to measure cost "    \
2446           "of stackbanging)")                                               \
2447                                                                             \
2448   develop(bool, UseStrictFP, true,                                          \
2449           "use strict fp if modifier strictfp is set")                      \
2450                                                                             \
2451   develop(bool, GenerateSynchronizationCode, true,                          \
2452           "generate locking/unlocking code for synchronized methods and "   \
2453           "monitors")                                                       \
2454                                                                             \
2455   develop(bool, GenerateRangeChecks, true,                                  \
2456           "Generate range checks for array accesses")                       \
2457                                                                             \
2458   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2459           "Generate code for implicit null checks")                         \
2460                                                                             \
2461   product_pd(bool, TrapBasedNullChecks,                                     \
2462           "Generate code for null checks that uses a cmp and trap "         \
2463           "instruction raising SIGTRAP.  This is only used if an access to" \
2464           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2465           "ImplicitNullChecks don't work (PPC64).")                         \
2466                                                                             \
2467   product(bool, PrintSafepointStatistics, false,                            \
2468           "Print statistics about safepoint synchronization")               \
2469                                                                             \
2470   product(intx, PrintSafepointStatisticsCount, 300,                         \
2471           "Total number of safepoint statistics collected "                 \
2472           "before printing them out")                                       \
2473           range(1, max_intx)                                                \
2474                                                                             \
2475   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2476           "Print safepoint statistics only when safepoint takes "           \
2477           "more than PrintSafepointSatisticsTimeout in millis")             \
2478   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2479   NOT_LP64(range(-1, max_intx))                                             \
2480                                                                             \
2481   product(bool, Inline, true,                                               \
2482           "Enable inlining")                                                \
2483                                                                             \
2484   product(bool, ClipInlining, true,                                         \
2485           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2486                                                                             \
2487   develop(bool, UseCHA, true,                                               \
2488           "Enable CHA")                                                     \
2489                                                                             \
2490   product(bool, UseTypeProfile, true,                                       \
2491           "Check interpreter profile for historically monomorphic calls")   \
2492                                                                             \
2493   diagnostic(bool, PrintInlining, false,                                    \
2494           "Print inlining optimizations")                                   \
2495                                                                             \
2496   product(bool, UsePopCountInstruction, false,                              \
2497           "Use population count instruction")                               \
2498                                                                             \
2499   develop(bool, EagerInitialization, false,                                 \
2500           "Eagerly initialize classes if possible")                         \
2501                                                                             \
2502   diagnostic(bool, LogTouchedMethods, false,                                \
2503           "Log methods which have been ever touched in runtime")            \
2504                                                                             \
2505   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2506           "Print all methods that have been ever touched in runtime")       \
2507                                                                             \
2508   develop(bool, TraceMethodReplacement, false,                              \
2509           "Print when methods are replaced do to recompilation")            \
2510                                                                             \
2511   develop(bool, PrintMethodFlushing, false,                                 \
2512           "Print the nmethods being flushed")                               \
2513                                                                             \
2514   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2515           "print statistics about method flushing")                         \
2516                                                                             \
2517   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2518           "Number of compiled code invocations after which "                \
2519           "the method is considered as hot by the flusher")                 \
2520           range(1, max_jint)                                                \
2521                                                                             \
2522   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2523           "Minimum number of sweeper passes before an nmethod "             \
2524           "can be flushed")                                                 \
2525           range(0, max_intx)                                                \
2526                                                                             \
2527   product(bool, UseCodeAging, true,                                         \
2528           "Insert counter to detect warm methods")                          \
2529                                                                             \
2530   diagnostic(bool, StressCodeAging, false,                                  \
2531           "Start with counters compiled in")                                \
2532                                                                             \
2533   develop(bool, StressCodeBuffers, false,                                   \
2534           "Exercise code buffer expansion and other rare state changes")    \
2535                                                                             \
2536   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2537           "Generate extra debugging information for non-safepoints in "     \
2538           "nmethods")                                                       \
2539                                                                             \
2540   product(bool, PrintVMOptions, false,                                      \
2541           "Print flags that appeared on the command line")                  \
2542                                                                             \
2543   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2544           "Ignore unrecognized VM options")                                 \
2545                                                                             \
2546   product(bool, PrintCommandLineFlags, false,                               \
2547           "Print flags specified on command line or set by ergonomics")     \
2548                                                                             \
2549   product(bool, PrintFlagsInitial, false,                                   \
2550           "Print all VM flags before argument processing and exit VM")      \
2551                                                                             \
2552   product(bool, PrintFlagsFinal, false,                                     \
2553           "Print all VM flags after argument and ergonomic processing")     \
2554                                                                             \
2555   notproduct(bool, PrintFlagsWithComments, false,                           \
2556           "Print all VM flags with default values and descriptions and "    \
2557           "exit")                                                           \
2558                                                                             \
2559   product(bool, PrintFlagsRanges, false,                                    \
2560           "Print VM flags and their ranges and exit VM")                    \
2561                                                                             \
2562   diagnostic(bool, SerializeVMOutput, true,                                 \
2563           "Use a mutex to serialize output to tty and LogFile")             \
2564                                                                             \
2565   diagnostic(bool, DisplayVMOutput, true,                                   \
2566           "Display all VM output on the tty, independently of LogVMOutput") \
2567                                                                             \
2568   diagnostic(bool, LogVMOutput, false,                                      \
2569           "Save VM output to LogFile")                                      \
2570                                                                             \
2571   diagnostic(ccstr, LogFile, NULL,                                          \
2572           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2573           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2574                                                                             \
2575   product(ccstr, ErrorFile, NULL,                                           \
2576           "If an error occurs, save the error data to this file "           \
2577           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2578                                                                             \
2579   product(bool, DisplayVMOutputToStderr, false,                             \
2580           "If DisplayVMOutput is true, display all VM output to stderr")    \
2581                                                                             \
2582   product(bool, DisplayVMOutputToStdout, false,                             \
2583           "If DisplayVMOutput is true, display all VM output to stdout")    \
2584                                                                             \
2585   product(bool, UseHeavyMonitors, false,                                    \
2586           "use heavyweight instead of lightweight Java monitors")           \
2587                                                                             \
2588   product(bool, PrintStringTableStatistics, false,                          \
2589           "print statistics about the StringTable and SymbolTable")         \
2590                                                                             \
2591   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2592           "verify StringTable contents at exit")                            \
2593                                                                             \
2594   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2595           "print histogram of the symbol table")                            \
2596                                                                             \
2597   notproduct(bool, ExitVMOnVerifyError, false,                              \
2598           "standard exit from VM if bytecode verify error "                 \
2599           "(only in debug mode)")                                           \
2600                                                                             \
2601   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2602           "Call fatal if this exception is thrown.  Example: "              \
2603           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2604                                                                             \
2605   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2606           "Call fatal if the exception pointed by AbortVMOnException "      \
2607           "has this message")                                               \
2608                                                                             \
2609   develop(bool, DebugVtables, false,                                        \
2610           "add debugging code to vtable dispatch")                          \
2611                                                                             \
2612   notproduct(bool, PrintVtableStats, false,                                 \
2613           "print vtables stats at end of run")                              \
2614                                                                             \
2615   develop(bool, TraceCreateZombies, false,                                  \
2616           "trace creation of zombie nmethods")                              \
2617                                                                             \
2618   notproduct(bool, IgnoreLockingAssertions, false,                          \
2619           "disable locking assertions (for speed)")                         \
2620                                                                             \
2621   product(bool, RangeCheckElimination, true,                                \
2622           "Eliminate range checks")                                         \
2623                                                                             \
2624   develop_pd(bool, UncommonNullCast,                                        \
2625           "track occurrences of null in casts; adjust compiler tactics")    \
2626                                                                             \
2627   develop(bool, TypeProfileCasts,  true,                                    \
2628           "treat casts like calls for purposes of type profiling")          \
2629                                                                             \
2630   develop(bool, DelayCompilationDuringStartup, true,                        \
2631           "Delay invoking the compiler until main application class is "    \
2632           "loaded")                                                         \
2633                                                                             \
2634   develop(bool, CompileTheWorld, false,                                     \
2635           "Compile all methods in all classes in bootstrap class path "     \
2636             "(stress test)")                                                \
2637                                                                             \
2638   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2639           "Preload all classes used by a class before start loading")       \
2640                                                                             \
2641   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2642           "Force a safepoint every n compiles so sweeper can keep up")      \
2643                                                                             \
2644   develop(bool, FillDelaySlots, true,                                       \
2645           "Fill delay slots (on SPARC only)")                               \
2646                                                                             \
2647   develop(bool, TimeLivenessAnalysis, false,                                \
2648           "Time computation of bytecode liveness analysis")                 \
2649                                                                             \
2650   develop(bool, TraceLivenessGen, false,                                    \
2651           "Trace the generation of liveness analysis information")          \
2652                                                                             \
2653   notproduct(bool, TraceLivenessQuery, false,                               \
2654           "Trace queries of liveness analysis information")                 \
2655                                                                             \
2656   notproduct(bool, CollectIndexSetStatistics, false,                        \
2657           "Collect information about IndexSets")                            \
2658                                                                             \
2659   develop(bool, UseLoopSafepoints, true,                                    \
2660           "Generate Safepoint nodes in every loop")                         \
2661                                                                             \
2662   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2663           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2664           "Inline allocations larger than this in doublewords must go slow")\
2665                                                                             \
2666   product(bool, AggressiveOpts, false,                                      \
2667           "Enable aggressive optimizations - see arguments.cpp")            \
2668                                                                             \
2669   product_pd(bool, CompactStrings,                                          \
2670           "Enable Strings to use single byte chars in backing store")       \
2671                                                                             \
2672   product_pd(uintx, TypeProfileLevel,                                       \
2673           "=XYZ, with Z: Type profiling of arguments at call; "             \
2674                      "Y: Type profiling of return value at call; "          \
2675                      "X: Type profiling of parameters to methods; "         \
2676           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2677           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2678                                                                             \
2679   product(intx, TypeProfileArgsLimit,     2,                                \
2680           "max number of call arguments to consider for type profiling")    \
2681           range(0, 16)                                                      \
2682                                                                             \
2683   product(intx, TypeProfileParmsLimit,    2,                                \
2684           "max number of incoming parameters to consider for type profiling"\
2685           ", -1 for all")                                                   \
2686           range(-1, 64)                                                     \
2687                                                                             \
2688   /* statistics */                                                          \
2689   develop(bool, CountCompiledCalls, false,                                  \
2690           "Count method invocations")                                       \
2691                                                                             \
2692   notproduct(bool, CountRuntimeCalls, false,                                \
2693           "Count VM runtime calls")                                         \
2694                                                                             \
2695   develop(bool, CountJNICalls, false,                                       \
2696           "Count jni method invocations")                                   \
2697                                                                             \
2698   notproduct(bool, CountJVMCalls, false,                                    \
2699           "Count jvm method invocations")                                   \
2700                                                                             \
2701   notproduct(bool, CountRemovableExceptions, false,                         \
2702           "Count exceptions that could be replaced by branches due to "     \
2703           "inlining")                                                       \
2704                                                                             \
2705   notproduct(bool, ICMissHistogram, false,                                  \
2706           "Produce histogram of IC misses")                                 \
2707                                                                             \
2708   /* interpreter */                                                         \
2709   product_pd(bool, RewriteBytecodes,                                        \
2710           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2711                                                                             \
2712   product_pd(bool, RewriteFrequentPairs,                                    \
2713           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2714                                                                             \
2715   diagnostic(bool, PrintInterpreter, false,                                 \
2716           "Print the generated interpreter code")                           \
2717                                                                             \
2718   product(bool, UseInterpreter, true,                                       \
2719           "Use interpreter for non-compiled methods")                       \
2720                                                                             \
2721   develop(bool, UseFastSignatureHandlers, true,                             \
2722           "Use fast signature handlers for native calls")                   \
2723                                                                             \
2724   product(bool, UseLoopCounter, true,                                       \
2725           "Increment invocation counter on backward branch")                \
2726                                                                             \
2727   product_pd(bool, UseOnStackReplacement,                                   \
2728           "Use on stack replacement, calls runtime if invoc. counter "      \
2729           "overflows in loop")                                              \
2730                                                                             \
2731   notproduct(bool, TraceOnStackReplacement, false,                          \
2732           "Trace on stack replacement")                                     \
2733                                                                             \
2734   product_pd(bool, PreferInterpreterNativeStubs,                            \
2735           "Use always interpreter stubs for native methods invoked via "    \
2736           "interpreter")                                                    \
2737                                                                             \
2738   develop(bool, CountBytecodes, false,                                      \
2739           "Count number of bytecodes executed")                             \
2740                                                                             \
2741   develop(bool, PrintBytecodeHistogram, false,                              \
2742           "Print histogram of the executed bytecodes")                      \
2743                                                                             \
2744   develop(bool, PrintBytecodePairHistogram, false,                          \
2745           "Print histogram of the executed bytecode pairs")                 \
2746                                                                             \
2747   diagnostic(bool, PrintSignatureHandlers, false,                           \
2748           "Print code generated for native method signature handlers")      \
2749                                                                             \
2750   develop(bool, VerifyOops, false,                                          \
2751           "Do plausibility checks for oops")                                \
2752                                                                             \
2753   develop(bool, CheckUnhandledOops, false,                                  \
2754           "Check for unhandled oops in VM code")                            \
2755                                                                             \
2756   develop(bool, VerifyJNIFields, trueInDebug,                               \
2757           "Verify jfieldIDs for instance fields")                           \
2758                                                                             \
2759   notproduct(bool, VerifyJNIEnvThread, false,                               \
2760           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2761           "from JNI")                                                       \
2762                                                                             \
2763   develop(bool, VerifyFPU, false,                                           \
2764           "Verify FPU state (check for NaN's, etc.)")                       \
2765                                                                             \
2766   develop(bool, VerifyThread, false,                                        \
2767           "Watch the thread register for corruption (SPARC only)")          \
2768                                                                             \
2769   develop(bool, VerifyActivationFrameSize, false,                           \
2770           "Verify that activation frame didn't become smaller than its "    \
2771           "minimal size")                                                   \
2772                                                                             \
2773   develop(bool, TraceFrequencyInlining, false,                              \
2774           "Trace frequency based inlining")                                 \
2775                                                                             \
2776   develop_pd(bool, InlineIntrinsics,                                        \
2777           "Inline intrinsics that can be statically resolved")              \
2778                                                                             \
2779   product_pd(bool, ProfileInterpreter,                                      \
2780           "Profile at the bytecode level during interpretation")            \
2781                                                                             \
2782   develop(bool, TraceProfileInterpreter, false,                             \
2783           "Trace profiling at the bytecode level during interpretation. "   \
2784           "This outputs the profiling information collected to improve "    \
2785           "jit compilation.")                                               \
2786                                                                             \
2787   develop_pd(bool, ProfileTraps,                                            \
2788           "Profile deoptimization traps at the bytecode level")             \
2789                                                                             \
2790   product(intx, ProfileMaturityPercentage, 20,                              \
2791           "number of method invocations/branches (expressed as % of "       \
2792           "CompileThreshold) before using the method's profile")            \
2793           range(0, 100)                                                     \
2794                                                                             \
2795   diagnostic(bool, PrintMethodData, false,                                  \
2796           "Print the results of +ProfileInterpreter at end of run")         \
2797                                                                             \
2798   develop(bool, VerifyDataPointer, trueInDebug,                             \
2799           "Verify the method data pointer during interpreter profiling")    \
2800                                                                             \
2801   develop(bool, VerifyCompiledCode, false,                                  \
2802           "Include miscellaneous runtime verifications in nmethod code; "   \
2803           "default off because it disturbs nmethod size heuristics")        \
2804                                                                             \
2805   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2806           "Manually make GC thread crash then dump java stack trace;  "     \
2807           "Test only")                                                      \
2808                                                                             \
2809   /* compilation */                                                         \
2810   product(bool, UseCompiler, true,                                          \
2811           "Use Just-In-Time compilation")                                   \
2812                                                                             \
2813   develop(bool, TraceCompilationPolicy, false,                              \
2814           "Trace compilation policy")                                       \
2815                                                                             \
2816   develop(bool, TimeCompilationPolicy, false,                               \
2817           "Time the compilation policy")                                    \
2818                                                                             \
2819   product(bool, UseCounterDecay, true,                                      \
2820           "Adjust recompilation counters")                                  \
2821                                                                             \
2822   develop(intx, CounterHalfLifeTime,    30,                                 \
2823           "Half-life time of invocation counters (in seconds)")             \
2824                                                                             \
2825   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2826           "The minimum interval (in milliseconds) between invocation of "   \
2827           "CounterDecay")                                                   \
2828                                                                             \
2829   product(bool, AlwaysCompileLoopMethods, false,                            \
2830           "When using recompilation, never interpret methods "              \
2831           "containing loops")                                               \
2832                                                                             \
2833   product(bool, DontCompileHugeMethods, true,                               \
2834           "Do not compile methods > HugeMethodLimit")                       \
2835                                                                             \
2836   /* Bytecode escape analysis estimation. */                                \
2837   product(bool, EstimateArgEscape, true,                                    \
2838           "Analyze bytecodes to estimate escape state of arguments")        \
2839                                                                             \
2840   product(intx, BCEATraceLevel, 0,                                          \
2841           "How much tracing to do of bytecode escape analysis estimates "   \
2842           "(0-3)")                                                          \
2843           range(0, 3)                                                       \
2844                                                                             \
2845   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2846           "Maximum number of nested calls that are analyzed by BC EA")      \
2847           range(0, max_jint)                                                \
2848                                                                             \
2849   product(intx, MaxBCEAEstimateSize, 150,                                   \
2850           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2851           range(0, max_jint)                                                \
2852                                                                             \
2853   product(intx,  AllocatePrefetchStyle, 1,                                  \
2854           "0 = no prefetch, "                                               \
2855           "1 = generate prefetch instructions for each allocation, "        \
2856           "2 = use TLAB watermark to gate allocation prefetch, "            \
2857           "3 = generate one prefetch instruction per cache line")           \
2858           range(0, 3)                                                       \
2859                                                                             \
2860   product(intx,  AllocatePrefetchDistance, -1,                              \
2861           "Distance to prefetch ahead of allocation pointer. "              \
2862           "-1: use system-specific value (automatically determined")        \
2863           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2864                                                                             \
2865   product(intx,  AllocatePrefetchLines, 3,                                  \
2866           "Number of lines to prefetch ahead of array allocation pointer")  \
2867           range(1, 64)                                                      \
2868                                                                             \
2869   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2870           "Number of lines to prefetch ahead of instance allocation "       \
2871           "pointer")                                                        \
2872           range(1, 64)                                                      \
2873                                                                             \
2874   product(intx,  AllocatePrefetchStepSize, 16,                              \
2875           "Step size in bytes of sequential prefetch instructions")         \
2876           range(1, 512)                                                     \
2877           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2878                                                                             \
2879   product(intx,  AllocatePrefetchInstr, 0,                                  \
2880           "Select instruction to prefetch ahead of allocation pointer")     \
2881           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2882                                                                             \
2883   /* deoptimization */                                                      \
2884   develop(bool, TraceDeoptimization, false,                                 \
2885           "Trace deoptimization")                                           \
2886                                                                             \
2887   develop(bool, PrintDeoptimizationDetails, false,                          \
2888           "Print more information about deoptimization")                    \
2889                                                                             \
2890   develop(bool, DebugDeoptimization, false,                                 \
2891           "Tracing various information while debugging deoptimization")     \
2892                                                                             \
2893   product(intx, SelfDestructTimer, 0,                                       \
2894           "Will cause VM to terminate after a given time (in minutes) "     \
2895           "(0 means off)")                                                  \
2896           range(0, max_intx)                                                \
2897                                                                             \
2898   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2899           "The maximum number of lines in the stack trace for Java "        \
2900           "exceptions (0 means all)")                                       \
2901           range(0, max_jint/2)                                              \
2902                                                                             \
2903   /* notice: the max range value here is max_jint, not max_intx  */         \
2904   /* because of overflow issue                                   */         \
2905   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
2906           "Guarantee a safepoint (at least) every so many milliseconds "    \
2907           "(0 means none)")                                                 \
2908           range(0, max_jint)                                                \
2909                                                                             \
2910   product(intx, SafepointTimeoutDelay, 10000,                               \
2911           "Delay in milliseconds for option SafepointTimeout")              \
2912   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
2913   NOT_LP64(range(0, max_intx))                                              \
2914                                                                             \
2915   product(intx, NmethodSweepActivity, 10,                                   \
2916           "Removes cold nmethods from code cache if > 0. Higher values "    \
2917           "result in more aggressive sweeping")                             \
2918           range(0, 2000)                                                    \
2919                                                                             \
2920   notproduct(bool, LogSweeper, false,                                       \
2921           "Keep a ring buffer of sweeper activity")                         \
2922                                                                             \
2923   notproduct(intx, SweeperLogEntries, 1024,                                 \
2924           "Number of records in the ring buffer of sweeper activity")       \
2925                                                                             \
2926   notproduct(intx, MemProfilingInterval, 500,                               \
2927           "Time between each invocation of the MemProfiler")                \
2928                                                                             \
2929   develop(intx, MallocCatchPtr, -1,                                         \
2930           "Hit breakpoint when mallocing/freeing this pointer")             \
2931                                                                             \
2932   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2933           "List of assertions (file:line) to muzzle")                       \
2934                                                                             \
2935   develop(intx, StackPrintLimit, 100,                                       \
2936           "number of stack frames to print in VM-level stack dump")         \
2937                                                                             \
2938   notproduct(intx, MaxElementPrintSize, 256,                                \
2939           "maximum number of elements to print")                            \
2940                                                                             \
2941   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2942           "maximum number of subklasses to print when printing klass")      \
2943                                                                             \
2944   product(intx, MaxInlineLevel, 9,                                          \
2945           "maximum number of nested calls that are inlined")                \
2946           range(0, max_jint)                                                \
2947                                                                             \
2948   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2949           "maximum number of nested recursive calls that are inlined")      \
2950           range(0, max_jint)                                                \
2951                                                                             \
2952   develop(intx, MaxForceInlineLevel, 100,                                   \
2953           "maximum number of nested calls that are forced for inlining "    \
2954           "(using CompileCommand or marked w/ @ForceInline)")               \
2955           range(0, max_jint)                                                \
2956                                                                             \
2957   product_pd(intx, InlineSmallCode,                                         \
2958           "Only inline already compiled methods if their code size is "     \
2959           "less than this")                                                 \
2960           range(0, max_jint)                                                \
2961                                                                             \
2962   product(intx, MaxInlineSize, 35,                                          \
2963           "The maximum bytecode size of a method to be inlined")            \
2964           range(0, max_jint)                                                \
2965                                                                             \
2966   product_pd(intx, FreqInlineSize,                                          \
2967           "The maximum bytecode size of a frequent method to be inlined")   \
2968           range(0, max_jint)                                                \
2969                                                                             \
2970   product(intx, MaxTrivialSize, 6,                                          \
2971           "The maximum bytecode size of a trivial method to be inlined")    \
2972           range(0, max_jint)                                                \
2973                                                                             \
2974   product(intx, MinInliningThreshold, 250,                                  \
2975           "The minimum invocation count a method needs to have to be "      \
2976           "inlined")                                                        \
2977           range(0, max_jint)                                                \
2978                                                                             \
2979   develop(intx, MethodHistogramCutoff, 100,                                 \
2980           "The cutoff value for method invocation histogram (+CountCalls)") \
2981                                                                             \
2982   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
2983           "Number of interpreted methods to show in profile")               \
2984                                                                             \
2985   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
2986           "Number of compiled methods to show in profile")                  \
2987                                                                             \
2988   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
2989           "Number of stub methods to show in profile")                      \
2990                                                                             \
2991   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
2992           "Number of runtime stub nodes to show in profile")                \
2993                                                                             \
2994   product(intx, ProfileIntervalsTicks, 100,                                 \
2995           "Number of ticks between printing of interval profile "           \
2996           "(+ProfileIntervals)")                                            \
2997           range(0, max_intx)                                                \
2998                                                                             \
2999   notproduct(intx, ScavengeALotInterval,     1,                             \
3000           "Interval between which scavenge will occur with +ScavengeALot")  \
3001                                                                             \
3002   notproduct(intx, FullGCALotInterval,     1,                               \
3003           "Interval between which full gc will occur with +FullGCALot")     \
3004                                                                             \
3005   notproduct(intx, FullGCALotStart,     0,                                  \
3006           "For which invocation to start FullGCAlot")                       \
3007                                                                             \
3008   notproduct(intx, FullGCALotDummies,  32*K,                                \
3009           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3010           "to move")                                                        \
3011                                                                             \
3012   develop(intx, DontYieldALotInterval,    10,                               \
3013           "Interval between which yields will be dropped (milliseconds)")   \
3014                                                                             \
3015   develop(intx, ProfilerPCTickThreshold,    15,                             \
3016           "Number of ticks in a PC buckets to be a hotspot")                \
3017                                                                             \
3018   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3019           "Number of exits until DeoptimizeALot kicks in")                  \
3020                                                                             \
3021   notproduct(intx, ZombieALotInterval,     5,                               \
3022           "Number of exits until ZombieALot kicks in")                      \
3023                                                                             \
3024   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3025           "If non-zero, maximum number of words that malloc/realloc can "   \
3026           "allocate (for testing only)")                                    \
3027           range(0, max_uintx)                                               \
3028                                                                             \
3029   product(intx, TypeProfileWidth, 2,                                        \
3030           "Number of receiver types to record in call/cast profile")        \
3031           range(0, 8)                                                       \
3032                                                                             \
3033   develop(intx, BciProfileWidth,      2,                                    \
3034           "Number of return bci's to record in ret profile")                \
3035                                                                             \
3036   product(intx, PerMethodRecompilationCutoff, 400,                          \
3037           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3038           range(-1, max_intx)                                               \
3039                                                                             \
3040   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3041           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3042           range(-1, max_intx)                                               \
3043                                                                             \
3044   product(intx, PerMethodTrapLimit,  100,                                   \
3045           "Limit on traps (of one kind) in a method (includes inlines)")    \
3046           range(0, max_jint)                                                \
3047                                                                             \
3048   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3049           "Limit on speculative traps (of one kind) in a method "           \
3050           "(includes inlines)")                                             \
3051           range(0, max_jint)                                                \
3052                                                                             \
3053   product(intx, PerBytecodeTrapLimit,  4,                                   \
3054           "Limit on traps (of one kind) at a particular BCI")               \
3055           range(0, max_jint)                                                \
3056                                                                             \
3057   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3058           "Extra method data trap entries for speculation")                 \
3059                                                                             \
3060   develop(intx, InlineFrequencyRatio,    20,                                \
3061           "Ratio of call site execution to caller method invocation")       \
3062           range(0, max_jint)                                                \
3063                                                                             \
3064   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3065           "Count of call site execution necessary to trigger frequent "     \
3066           "inlining")                                                       \
3067           range(0, max_jint)                                                \
3068                                                                             \
3069   develop(intx, InlineThrowCount,    50,                                    \
3070           "Force inlining of interpreted methods that throw this often")    \
3071           range(0, max_jint)                                                \
3072                                                                             \
3073   develop(intx, InlineThrowMaxSize,   200,                                  \
3074           "Force inlining of throwing methods smaller than this")           \
3075           range(0, max_jint)                                                \
3076                                                                             \
3077   develop(intx, ProfilerNodeSize,  1024,                                    \
3078           "Size in K to allocate for the Profile Nodes of each thread")     \
3079           range(0, 1024)                                                    \
3080                                                                             \
3081   /* gc parameters */                                                       \
3082   product(size_t, InitialHeapSize, 0,                                       \
3083           "Initial heap size (in bytes); zero means use ergonomics")        \
3084           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3085                                                                             \
3086   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3087           "Maximum heap size (in bytes)")                                   \
3088           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3089                                                                             \
3090   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3091           "Initial tenured generation size (in bytes)")                     \
3092           range(0, max_uintx)                                               \
3093                                                                             \
3094   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3095           "Initial new generation size (in bytes)")                         \
3096           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3097                                                                             \
3098   product(size_t, MaxNewSize, max_uintx,                                    \
3099           "Maximum new generation size (in bytes), max_uintx means set "    \
3100           "ergonomically")                                                  \
3101           range(0, max_uintx)                                               \
3102                                                                             \
3103   product_pd(size_t, HeapBaseMinAddress,                                    \
3104           "OS specific low limit for heap base address")                    \
3105           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3106                                                                             \
3107   product(size_t, PretenureSizeThreshold, 0,                                \
3108           "Maximum size in bytes of objects allocated in DefNew "           \
3109           "generation; zero means no maximum")                              \
3110           range(0, max_uintx)                                               \
3111                                                                             \
3112   product(size_t, MinTLABSize, 2*K,                                         \
3113           "Minimum allowed TLAB size (in bytes)")                           \
3114           range(1, max_uintx/2)                                             \
3115           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3116                                                                             \
3117   product(size_t, TLABSize, 0,                                              \
3118           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3119           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3120                                                                             \
3121   product(size_t, YoungPLABSize, 4096,                                      \
3122           "Size of young gen promotion LAB's (in HeapWords)")               \
3123           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3124                                                                             \
3125   product(size_t, OldPLABSize, 1024,                                        \
3126           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3127           "of blocks to attempt to claim when refilling CMS LAB's")         \
3128           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3129                                                                             \
3130   product(uintx, TLABAllocationWeight, 35,                                  \
3131           "Allocation averaging weight")                                    \
3132           range(0, 100)                                                     \
3133                                                                             \
3134   /* Limit the lower bound of this flag to 1 as it is used  */              \
3135   /* in a division expression.                              */              \
3136   product(uintx, TLABWasteTargetPercent, 1,                                 \
3137           "Percentage of Eden that can be wasted")                          \
3138           range(1, 100)                                                     \
3139                                                                             \
3140   product(uintx, TLABRefillWasteFraction,    64,                            \
3141           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3142           range(1, max_juint)                                               \
3143                                                                             \
3144   product(uintx, TLABWasteIncrement,    4,                                  \
3145           "Increment allowed waste at slow allocation")                     \
3146           range(0, max_jint)                                                \
3147           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3148                                                                             \
3149   product(uintx, SurvivorRatio, 8,                                          \
3150           "Ratio of eden/survivor space size")                              \
3151           range(1, max_uintx-2)                                             \
3152           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3153                                                                             \
3154   product(uintx, NewRatio, 2,                                               \
3155           "Ratio of old/new generation sizes")                              \
3156           range(0, max_uintx-1)                                             \
3157                                                                             \
3158   product_pd(size_t, NewSizeThreadIncrease,                                 \
3159           "Additional size added to desired new generation size per "       \
3160           "non-daemon thread (in bytes)")                                   \
3161           range(0, max_uintx)                                               \
3162                                                                             \
3163   product_pd(size_t, MetaspaceSize,                                         \
3164           "Initial threshold (in bytes) at which a garbage collection "     \
3165           "is done to reduce Metaspace usage")                              \
3166           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3167                                                                             \
3168   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3169           "Maximum size of Metaspaces (in bytes)")                          \
3170           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3171                                                                             \
3172   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3173           "Maximum size of class area in Metaspace when compressed "        \
3174           "class pointers are used")                                        \
3175           range(1*M, 3*G)                                                   \
3176                                                                             \
3177   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3178           "The minimum percentage of heap free after GC to avoid expansion."\
3179           " For most GCs this applies to the old generation. In G1 and"     \
3180           " ParallelGC it applies to the whole heap.")                      \
3181           range(0, 100)                                                     \
3182           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3183                                                                             \
3184   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3185           "The maximum percentage of heap free after GC to avoid shrinking."\
3186           " For most GCs this applies to the old generation. In G1 and"     \
3187           " ParallelGC it applies to the whole heap.")                      \
3188           range(0, 100)                                                     \
3189           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3190                                                                             \
3191   product(bool, ShrinkHeapInSteps, true,                                    \
3192           "When disabled, informs the GC to shrink the java heap directly"  \
3193           " to the target size at the next full GC rather than requiring"   \
3194           " smaller steps during multiple full GCs.")                       \
3195                                                                             \
3196   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3197           "Number of milliseconds per MB of free space in the heap")        \
3198           range(0, max_intx)                                                \
3199           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3200                                                                             \
3201   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3202           "The minimum change in heap space due to GC (in bytes)")          \
3203           range(0, max_uintx)                                               \
3204                                                                             \
3205   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3206           "The minimum expansion of Metaspace (in bytes)")                  \
3207           range(0, max_uintx)                                               \
3208                                                                             \
3209   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3210           "The maximum percentage of Metaspace free after GC to avoid "     \
3211           "shrinking")                                                      \
3212           range(0, 100)                                                     \
3213           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3214                                                                             \
3215   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3216           "The minimum percentage of Metaspace free after GC to avoid "     \
3217           "expansion")                                                      \
3218           range(0, 99)                                                      \
3219           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3220                                                                             \
3221   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3222           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3223           range(0, max_uintx)                                               \
3224                                                                             \
3225   product(uintx, QueuedAllocationWarningCount, 0,                           \
3226           "Number of times an allocation that queues behind a GC "          \
3227           "will retry before printing a warning")                           \
3228           range(0, max_uintx)                                               \
3229                                                                             \
3230   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3231           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3232           range(0, max_uintx)                                               \
3233                                                                             \
3234   diagnostic(intx, VerifyGCLevel,     0,                                    \
3235           "Generation level at which to start +VerifyBefore/AfterGC")       \
3236           range(0, 1)                                                       \
3237                                                                             \
3238   product(uintx, MaxTenuringThreshold,    15,                               \
3239           "Maximum value for tenuring threshold")                           \
3240           range(0, markOopDesc::max_age + 1)                                \
3241           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3242                                                                             \
3243   product(uintx, InitialTenuringThreshold,    7,                            \
3244           "Initial value for tenuring threshold")                           \
3245           range(0, markOopDesc::max_age + 1)                                \
3246           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3247                                                                             \
3248   product(uintx, TargetSurvivorRatio,    50,                                \
3249           "Desired percentage of survivor space used after scavenge")       \
3250           range(0, 100)                                                     \
3251                                                                             \
3252   product(uintx, MarkSweepDeadRatio,     5,                                 \
3253           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3254           "Serial mark sweep treats this as both the minimum and maximum "  \
3255           "value. "                                                         \
3256           "CMS uses this value only if it falls back to mark sweep. "       \
3257           "Par compact uses a variable scale based on the density of the "  \
3258           "generation and treats this as the maximum value when the heap "  \
3259           "is either completely full or completely empty.  Par compact "    \
3260           "also has a smaller default value; see arguments.cpp.")           \
3261           range(0, 100)                                                     \
3262                                                                             \
3263   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3264           "How often should we fully compact the heap (ignoring the dead "  \
3265           "space parameters)")                                              \
3266           range(1, max_juint)                                               \
3267                                                                             \
3268   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3269           "Delay between expansion and allocation (in milliseconds)")       \
3270                                                                             \
3271   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3272           "Delay in scheduling GC workers (in milliseconds)")               \
3273                                                                             \
3274   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3275           "(Unstable) Number of times to iterate in safepoint loop "        \
3276           "before blocking VM threads ")                                    \
3277           range(-1, max_jint-1)                                             \
3278                                                                             \
3279   product(intx, DeferPollingPageLoopCount,     -1,                          \
3280           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3281           "before changing safepoint polling page to RO ")                  \
3282           range(-1, max_jint-1)                                             \
3283                                                                             \
3284   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3285           range(0, max_intx)                                                \
3286                                                                             \
3287   product(bool, PSChunkLargeArrays, true,                                   \
3288           "Process large arrays in chunks")                                 \
3289                                                                             \
3290   product(uintx, GCDrainStackTargetSize, 64,                                \
3291           "Number of entries we will try to leave on the stack "            \
3292           "during parallel gc")                                             \
3293           range(0, max_juint)                                               \
3294                                                                             \
3295   /* stack parameters */                                                    \
3296   product_pd(intx, StackYellowPages,                                        \
3297           "Number of yellow zone (recoverable overflows) pages of size "    \
3298           "4KB. If pages are bigger yellow zone is aligned up.")            \
3299           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3300                                                                             \
3301   product_pd(intx, StackRedPages,                                           \
3302           "Number of red zone (unrecoverable overflows) pages of size "     \
3303           "4KB. If pages are bigger red zone is aligned up.")               \
3304           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3305                                                                             \
3306   product_pd(intx, StackReservedPages,                                      \
3307           "Number of reserved zone (reserved to annotated methods) pages"   \
3308           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3309           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3310                                                                             \
3311   product(bool, RestrictReservedStack, true,                                \
3312           "Restrict @ReservedStackAccess to trusted classes")               \
3313                                                                             \
3314   /* greater stack shadow pages can't generate instruction to bang stack */ \
3315   product_pd(intx, StackShadowPages,                                        \
3316           "Number of shadow zone (for overflow checking) pages of size "    \
3317           "4KB. If pages are bigger shadow zone is aligned up. "            \
3318           "This should exceed the depth of the VM and native call stack.")  \
3319           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3320                                                                             \
3321   product_pd(intx, ThreadStackSize,                                         \
3322           "Thread Stack Size (in Kbytes)")                                  \
3323           range(0, 1 * M)                                                   \
3324                                                                             \
3325   product_pd(intx, VMThreadStackSize,                                       \
3326           "Non-Java Thread Stack Size (in Kbytes)")                         \
3327           range(0, max_intx/(1 * K))                                        \
3328                                                                             \
3329   product_pd(intx, CompilerThreadStackSize,                                 \
3330           "Compiler Thread Stack Size (in Kbytes)")                         \
3331           range(0, max_intx/(1 * K))                                        \
3332                                                                             \
3333   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3334           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3335                                                                             \
3336   /* code cache parameters                                    */            \
3337   develop_pd(uintx, CodeCacheSegmentSize,                                   \
3338           "Code cache segment size (in bytes) - smallest unit of "          \
3339           "allocation")                                                     \
3340           range(1, 1024)                                                    \
3341           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3342                                                                             \
3343   develop_pd(intx, CodeEntryAlignment,                                      \
3344           "Code entry alignment for generated code (in bytes)")             \
3345           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3346                                                                             \
3347   product_pd(intx, OptoLoopAlignment,                                       \
3348           "Align inner loops to zero relative to this modulus")             \
3349           range(1, 16)                                                      \
3350           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3351                                                                             \
3352   product_pd(uintx, InitialCodeCacheSize,                                   \
3353           "Initial code cache size (in bytes)")                             \
3354           range(0, max_uintx)                                               \
3355                                                                             \
3356   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3357           "Minimum code cache size (in bytes) required to start VM.")       \
3358           range(0, max_uintx)                                               \
3359                                                                             \
3360   product(bool, SegmentedCodeCache, false,                                  \
3361           "Use a segmented code cache")                                     \
3362                                                                             \
3363   product_pd(uintx, ReservedCodeCacheSize,                                  \
3364           "Reserved code cache size (in bytes) - maximum code cache size")  \
3365           range(0, max_uintx)                                               \
3366                                                                             \
3367   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3368           "Size of code heap with non-profiled methods (in bytes)")         \
3369           range(0, max_uintx)                                               \
3370                                                                             \
3371   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3372           "Size of code heap with profiled methods (in bytes)")             \
3373           range(0, max_uintx)                                               \
3374                                                                             \
3375   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3376           "Size of code heap with non-nmethods (in bytes)")                 \
3377           range(0, max_uintx)                                               \
3378                                                                             \
3379   product_pd(uintx, CodeCacheExpansionSize,                                 \
3380           "Code cache expansion size (in bytes)")                           \
3381           range(0, max_uintx)                                               \
3382                                                                             \
3383   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
3384           "Minimum number of segments in a code cache block")               \
3385           range(1, 100)                                                     \
3386                                                                             \
3387   notproduct(bool, ExitOnFullCodeCache, false,                              \
3388           "Exit the VM if we fill the code cache")                          \
3389                                                                             \
3390   product(bool, UseCodeCacheFlushing, true,                                 \
3391           "Remove cold/old nmethods from the code cache")                   \
3392                                                                             \
3393   product(uintx, StartAggressiveSweepingAt, 10,                             \
3394           "Start aggressive sweeping if X[%] of the code cache is free."    \
3395           "Segmented code cache: X[%] of the non-profiled heap."            \
3396           "Non-segmented code cache: X[%] of the total code cache")         \
3397           range(0, 100)                                                     \
3398                                                                             \
3399   /* AOT parameters */                                                      \
3400   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
3401           "Use AOT compiled files")                                         \
3402                                                                             \
3403   product(ccstrlist, AOTLibrary, NULL,                                      \
3404           "AOT library")                                                    \
3405                                                                             \
3406   product(bool, PrintAOT, false,                                            \
3407           "Print used AOT klasses and methods")                             \
3408                                                                             \
3409   notproduct(bool, PrintAOTStatistics, false,                               \
3410           "Print AOT statistics")                                           \
3411                                                                             \
3412   diagnostic(bool, UseAOTStrictLoading, false,                              \
3413           "Exit the VM if any of the AOT libraries has invalid config")     \
3414                                                                             \
3415   product(bool, CalculateClassFingerprint, false,                           \
3416           "Calculate class fingerprint")                                    \
3417                                                                             \
3418   /* interpreter debugging */                                               \
3419   develop(intx, BinarySwitchThreshold, 5,                                   \
3420           "Minimal number of lookupswitch entries for rewriting to binary " \
3421           "switch")                                                         \
3422                                                                             \
3423   develop(intx, StopInterpreterAt, 0,                                       \
3424           "Stop interpreter execution at specified bytecode number")        \
3425                                                                             \
3426   develop(intx, TraceBytecodesAt, 0,                                        \
3427           "Trace bytecodes starting with specified bytecode number")        \
3428                                                                             \
3429   /* compiler interface */                                                  \
3430   develop(intx, CIStart, 0,                                                 \
3431           "The id of the first compilation to permit")                      \
3432                                                                             \
3433   develop(intx, CIStop, max_jint,                                           \
3434           "The id of the last compilation to permit")                       \
3435                                                                             \
3436   develop(intx, CIStartOSR, 0,                                              \
3437           "The id of the first osr compilation to permit "                  \
3438           "(CICountOSR must be on)")                                        \
3439                                                                             \
3440   develop(intx, CIStopOSR, max_jint,                                        \
3441           "The id of the last osr compilation to permit "                   \
3442           "(CICountOSR must be on)")                                        \
3443                                                                             \
3444   develop(intx, CIBreakAtOSR, -1,                                           \
3445           "The id of osr compilation to break at")                          \
3446                                                                             \
3447   develop(intx, CIBreakAt, -1,                                              \
3448           "The id of compilation to break at")                              \
3449                                                                             \
3450   product(ccstrlist, CompileOnly, "",                                       \
3451           "List of methods (pkg/class.name) to restrict compilation to")    \
3452                                                                             \
3453   product(ccstr, CompileCommandFile, NULL,                                  \
3454           "Read compiler commands from this file [.hotspot_compiler]")      \
3455                                                                             \
3456   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3457           "Read compiler directives from this file")                        \
3458                                                                             \
3459   product(ccstrlist, CompileCommand, "",                                    \
3460           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3461                                                                             \
3462   develop(bool, ReplayCompiles, false,                                      \
3463           "Enable replay of compilations from ReplayDataFile")              \
3464                                                                             \
3465   product(ccstr, ReplayDataFile, NULL,                                      \
3466           "File containing compilation replay information"                  \
3467           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3468                                                                             \
3469    product(ccstr, InlineDataFile, NULL,                                     \
3470           "File containing inlining replay information"                     \
3471           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3472                                                                             \
3473   develop(intx, ReplaySuppressInitializers, 2,                              \
3474           "Control handling of class initialization during replay: "        \
3475           "0 - don't do anything special; "                                 \
3476           "1 - treat all class initializers as empty; "                     \
3477           "2 - treat class initializers for application classes as empty; " \
3478           "3 - allow all class initializers to run during bootstrap but "   \
3479           "    pretend they are empty after starting replay")               \
3480           range(0, 3)                                                       \
3481                                                                             \
3482   develop(bool, ReplayIgnoreInitErrors, false,                              \
3483           "Ignore exceptions thrown during initialization for replay")      \
3484                                                                             \
3485   product(bool, DumpReplayDataOnError, true,                                \
3486           "Record replay data for crashing compiler threads")               \
3487                                                                             \
3488   product(bool, CICompilerCountPerCPU, false,                               \
3489           "1 compiler thread for log(N CPUs)")                              \
3490                                                                             \
3491   develop(intx, CIFireOOMAt,    -1,                                         \
3492           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3493           "(non-negative value throws OOM after this many CI accesses "     \
3494           "in each compile)")                                               \
3495   notproduct(intx, CICrashAt, -1,                                           \
3496           "id of compilation to trigger assert in compiler thread for "     \
3497           "the purpose of testing, e.g. generation of replay data")         \
3498   notproduct(bool, CIObjectFactoryVerify, false,                            \
3499           "enable potentially expensive verification in ciObjectFactory")   \
3500                                                                             \
3501   /* Priorities */                                                          \
3502   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3503                                                                             \
3504   product(intx, ThreadPriorityPolicy, 0,                                    \
3505           "0 : Normal.                                                     "\
3506           "    VM chooses priorities that are appropriate for normal       "\
3507           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3508           "    to normal native priority. Java priorities below "           \
3509           "    NORM_PRIORITY map to lower native priority values. On       "\
3510           "    Windows applications are allowed to use higher native       "\
3511           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3512           "    not use the highest possible native priority,               "\
3513           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3514           "    system threads. On Linux thread priorities are ignored      "\
3515           "    because the OS does not support static priority in          "\
3516           "    SCHED_OTHER scheduling class which is the only choice for   "\
3517           "    non-root, non-realtime applications.                        "\
3518           "1 : Aggressive.                                                 "\
3519           "    Java thread priorities map over to the entire range of      "\
3520           "    native thread priorities. Higher Java thread priorities map "\
3521           "    to higher native thread priorities. This policy should be   "\
3522           "    used with care, as sometimes it can cause performance       "\
3523           "    degradation in the application and/or the entire system. On "\
3524           "    Linux this policy requires root privilege.")                 \
3525           range(0, 1)                                                       \
3526                                                                             \
3527   product(bool, ThreadPriorityVerbose, false,                               \
3528           "Print priority changes")                                         \
3529                                                                             \
3530   product(intx, CompilerThreadPriority, -1,                                 \
3531           "The native priority at which compiler threads should run "       \
3532           "(-1 means no change)")                                           \
3533           range(min_jint, max_jint)                                         \
3534           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3535                                                                             \
3536   product(intx, VMThreadPriority, -1,                                       \
3537           "The native priority at which the VM thread should run "          \
3538           "(-1 means no change)")                                           \
3539           range(-1, 127)                                                    \
3540                                                                             \
3541   product(bool, CompilerThreadHintNoPreempt, true,                          \
3542           "(Solaris only) Give compiler threads an extra quanta")           \
3543                                                                             \
3544   product(bool, VMThreadHintNoPreempt, false,                               \
3545           "(Solaris only) Give VM thread an extra quanta")                  \
3546                                                                             \
3547   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3548           "Map Java priorities to OS priorities")                           \
3549           range(-1, 127)                                                    \
3550                                                                             \
3551   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3552           "Map Java priorities to OS priorities")                           \
3553           range(-1, 127)                                                    \
3554                                                                             \
3555   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3556           "Map Java priorities to OS priorities")                           \
3557           range(-1, 127)                                                    \
3558                                                                             \
3559   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3560           "Map Java priorities to OS priorities")                           \
3561           range(-1, 127)                                                    \
3562                                                                             \
3563   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3564           "Map Java priorities to OS priorities")                           \
3565           range(-1, 127)                                                    \
3566                                                                             \
3567   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3568           "Map Java priorities to OS priorities")                           \
3569           range(-1, 127)                                                    \
3570                                                                             \
3571   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3572           "Map Java priorities to OS priorities")                           \
3573           range(-1, 127)                                                    \
3574                                                                             \
3575   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3576           "Map Java priorities to OS priorities")                           \
3577           range(-1, 127)                                                    \
3578                                                                             \
3579   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3580           "Map Java priorities to OS priorities")                           \
3581           range(-1, 127)                                                    \
3582                                                                             \
3583   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3584           "Map Java priorities to OS priorities")                           \
3585           range(-1, 127)                                                    \
3586                                                                             \
3587   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3588           "Java thread priority 10 maps to critical scheduling priority")   \
3589                                                                             \
3590   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3591           "Compiler thread(s) run at critical scheduling priority")         \
3592                                                                             \
3593   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3594           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3595                                                                             \
3596   /* compiler debugging */                                                  \
3597   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3598           "First class to consider when using +CompileTheWorld")            \
3599                                                                             \
3600   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3601           "Last class to consider when using +CompileTheWorld")             \
3602                                                                             \
3603   develop(intx, NewCodeParameter,      0,                                   \
3604           "Testing Only: Create a dedicated integer parameter before "      \
3605           "putback")                                                        \
3606                                                                             \
3607   /* new oopmap storage allocation */                                       \
3608   develop(intx, MinOopMapAllocation,     8,                                 \
3609           "Minimum number of OopMap entries in an OopMapSet")               \
3610                                                                             \
3611   /* Background Compilation */                                              \
3612   develop(intx, LongCompileThreshold,     50,                               \
3613           "Used with +TraceLongCompiles")                                   \
3614                                                                             \
3615   /* recompilation */                                                       \
3616   product_pd(intx, CompileThreshold,                                        \
3617           "number of interpreted method invocations before (re-)compiling") \
3618           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3619                                                                             \
3620   product(double, CompileThresholdScaling, 1.0,                             \
3621           "Factor to control when first compilation happens "               \
3622           "(both with and without tiered compilation): "                    \
3623           "values greater than 1.0 delay counter overflow, "                \
3624           "values between 0 and 1.0 rush counter overflow, "                \
3625           "value of 1.0 leaves compilation thresholds unchanged "           \
3626           "value of 0.0 is equivalent to -Xint. "                           \
3627           ""                                                                \
3628           "Flag can be set as per-method option. "                          \
3629           "If a value is specified for a method, compilation thresholds "   \
3630           "for that method are scaled by both the value of the global flag "\
3631           "and the value of the per-method flag.")                          \
3632           range(0.0, DBL_MAX)                                               \
3633                                                                             \
3634   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3635           "Interpreter (tier 0) invocation notification frequency")         \
3636           range(0, 30)                                                      \
3637                                                                             \
3638   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3639           "C1 without MDO (tier 2) invocation notification frequency")      \
3640           range(0, 30)                                                      \
3641                                                                             \
3642   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3643           "C1 with MDO profiling (tier 3) invocation notification "         \
3644           "frequency")                                                      \
3645           range(0, 30)                                                      \
3646                                                                             \
3647   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3648           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3649           range(0, 30)                                                      \
3650                                                                             \
3651   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3652           "Interpreter (tier 0) invocation notification frequency")         \
3653           range(0, 30)                                                      \
3654                                                                             \
3655   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3656           "C1 without MDO (tier 2) invocation notification frequency")      \
3657           range(0, 30)                                                      \
3658                                                                             \
3659   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3660           "C1 with MDO profiling (tier 3) invocation notification "         \
3661           "frequency")                                                      \
3662           range(0, 30)                                                      \
3663                                                                             \
3664   product(intx, Tier2CompileThreshold, 0,                                   \
3665           "threshold at which tier 2 compilation is invoked")               \
3666           range(0, max_jint)                                                \
3667                                                                             \
3668   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3669           "Back edge threshold at which tier 2 compilation is invoked")     \
3670           range(0, max_jint)                                                \
3671                                                                             \
3672   product(intx, Tier3InvocationThreshold, 200,                              \
3673           "Compile if number of method invocations crosses this "           \
3674           "threshold")                                                      \
3675           range(0, max_jint)                                                \
3676                                                                             \
3677   product(intx, Tier3MinInvocationThreshold, 100,                           \
3678           "Minimum invocation to compile at tier 3")                        \
3679           range(0, max_jint)                                                \
3680                                                                             \
3681   product(intx, Tier3CompileThreshold, 2000,                                \
3682           "Threshold at which tier 3 compilation is invoked (invocation "   \
3683           "minimum must be satisfied)")                                     \
3684           range(0, max_jint)                                                \
3685                                                                             \
3686   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3687           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3688           range(0, max_jint)                                                \
3689                                                                             \
3690   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
3691           "Compile if number of method invocations crosses this "           \
3692           "threshold if coming from AOT")                                   \
3693           range(0, max_jint)                                                \
3694                                                                             \
3695   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
3696           "Minimum invocation to compile at tier 3 if coming from AOT")     \
3697           range(0, max_jint)                                                \
3698                                                                             \
3699   product(intx, Tier3AOTCompileThreshold, 15000,                            \
3700           "Threshold at which tier 3 compilation is invoked (invocation "   \
3701           "minimum must be satisfied) if coming from AOT")                  \
3702           range(0, max_jint)                                                \
3703                                                                             \
3704   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
3705           "Back edge threshold at which tier 3 OSR compilation is invoked " \
3706           "if coming from AOT")                                             \
3707           range(0, max_jint)                                                \
3708                                                                             \
3709   product(intx, Tier4InvocationThreshold, 5000,                             \
3710           "Compile if number of method invocations crosses this "           \
3711           "threshold")                                                      \
3712           range(0, max_jint)                                                \
3713                                                                             \
3714   product(intx, Tier4MinInvocationThreshold, 600,                           \
3715           "Minimum invocation to compile at tier 4")                        \
3716           range(0, max_jint)                                                \
3717                                                                             \
3718   product(intx, Tier4CompileThreshold, 15000,                               \
3719           "Threshold at which tier 4 compilation is invoked (invocation "   \
3720           "minimum must be satisfied")                                      \
3721           range(0, max_jint)                                                \
3722                                                                             \
3723   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3724           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3725           range(0, max_jint)                                                \
3726                                                                             \
3727   product(intx, Tier3DelayOn, 5,                                            \
3728           "If C2 queue size grows over this amount per compiler thread "    \
3729           "stop compiling at tier 3 and start compiling at tier 2")         \
3730           range(0, max_jint)                                                \
3731                                                                             \
3732   product(intx, Tier3DelayOff, 2,                                           \
3733           "If C2 queue size is less than this amount per compiler thread "  \
3734           "allow methods compiled at tier 2 transition to tier 3")          \
3735           range(0, max_jint)                                                \
3736                                                                             \
3737   product(intx, Tier3LoadFeedback, 5,                                       \
3738           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3739           "reaches this amount per compiler thread")                        \
3740           range(0, max_jint)                                                \
3741                                                                             \
3742   product(intx, Tier4LoadFeedback, 3,                                       \
3743           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3744           "reaches this amount per compiler thread")                        \
3745           range(0, max_jint)                                                \
3746                                                                             \
3747   product(intx, TieredCompileTaskTimeout, 50,                               \
3748           "Kill compile task if method was not used within "                \
3749           "given timeout in milliseconds")                                  \
3750           range(0, max_intx)                                                \
3751                                                                             \
3752   product(intx, TieredStopAtLevel, 4,                                       \
3753           "Stop at given compilation level")                                \
3754           range(0, 4)                                                       \
3755                                                                             \
3756   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3757           "Start profiling in interpreter if the counters exceed tier 3 "   \
3758           "thresholds by the specified percentage")                         \
3759           range(0, max_jint)                                                \
3760                                                                             \
3761   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3762           "Increase the compile threshold for C1 compilation if the code "  \
3763           "cache is filled by the specified percentage")                    \
3764           range(0, 99)                                                      \
3765                                                                             \
3766   product(intx, TieredRateUpdateMinTime, 1,                                 \
3767           "Minimum rate sampling interval (in milliseconds)")               \
3768           range(0, max_intx)                                                \
3769                                                                             \
3770   product(intx, TieredRateUpdateMaxTime, 25,                                \
3771           "Maximum rate sampling interval (in milliseconds)")               \
3772           range(0, max_intx)                                                \
3773                                                                             \
3774   product_pd(bool, TieredCompilation,                                       \
3775           "Enable tiered compilation")                                      \
3776                                                                             \
3777   product(bool, PrintTieredEvents, false,                                   \
3778           "Print tiered events notifications")                              \
3779                                                                             \
3780   product_pd(intx, OnStackReplacePercentage,                                \
3781           "NON_TIERED number of method invocations/branches (expressed as " \
3782           "% of CompileThreshold) before (re-)compiling OSR code")          \
3783           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3784                                                                             \
3785   product(intx, InterpreterProfilePercentage, 33,                           \
3786           "NON_TIERED number of method invocations/branches (expressed as " \
3787           "% of CompileThreshold) before profiling in the interpreter")     \
3788           range(0, 100)                                                     \
3789                                                                             \
3790   develop(intx, MaxRecompilationSearchLength,    10,                        \
3791           "The maximum number of frames to inspect when searching for "     \
3792           "recompilee")                                                     \
3793                                                                             \
3794   develop(intx, MaxInterpretedSearchLength,     3,                          \
3795           "The maximum number of interpreted frames to skip when searching "\
3796           "for recompilee")                                                 \
3797                                                                             \
3798   develop(intx, DesiredMethodLimit,  8000,                                  \
3799           "The desired maximum method size (in bytecodes) after inlining")  \
3800                                                                             \
3801   develop(intx, HugeMethodLimit,  8000,                                     \
3802           "Don't compile methods larger than this if "                      \
3803           "+DontCompileHugeMethods")                                        \
3804                                                                             \
3805   /* New JDK 1.4 reflection implementation */                               \
3806                                                                             \
3807   develop(intx, FastSuperclassLimit, 8,                                     \
3808           "Depth of hardwired instanceof accelerator array")                \
3809                                                                             \
3810   /* Properties for Java libraries  */                                      \
3811                                                                             \
3812   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3813           "Maximum total size of NIO direct-buffer allocations")            \
3814           range(0, max_jlong)                                               \
3815                                                                             \
3816   /* Flags used for temporary code during development  */                   \
3817                                                                             \
3818   diagnostic(bool, UseNewCode, false,                                       \
3819           "Testing Only: Use the new version while testing")                \
3820                                                                             \
3821   diagnostic(bool, UseNewCode2, false,                                      \
3822           "Testing Only: Use the new version while testing")                \
3823                                                                             \
3824   diagnostic(bool, UseNewCode3, false,                                      \
3825           "Testing Only: Use the new version while testing")                \
3826                                                                             \
3827   /* flags for performance data collection */                               \
3828                                                                             \
3829   product(bool, UsePerfData, true,                                          \
3830           "Flag to disable jvmstat instrumentation for performance testing "\
3831           "and problem isolation purposes")                                 \
3832                                                                             \
3833   product(bool, PerfDataSaveToFile, false,                                  \
3834           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3835                                                                             \
3836   product(ccstr, PerfDataSaveFile, NULL,                                    \
3837           "Save PerfData memory to the specified absolute pathname. "       \
3838           "The string %p in the file name (if present) "                    \
3839           "will be replaced by pid")                                        \
3840                                                                             \
3841   product(intx, PerfDataSamplingInterval, 50,                               \
3842           "Data sampling interval (in milliseconds)")                       \
3843           range(PeriodicTask::min_interval, max_jint)                       \
3844           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3845                                                                             \
3846   product(bool, PerfDisableSharedMem, false,                                \
3847           "Store performance data in standard memory")                      \
3848                                                                             \
3849   product(intx, PerfDataMemorySize, 32*K,                                   \
3850           "Size of performance data memory region. Will be rounded "        \
3851           "up to a multiple of the native os page size.")                   \
3852           range(128, 32*64*K)                                               \
3853                                                                             \
3854   product(intx, PerfMaxStringConstLength, 1024,                             \
3855           "Maximum PerfStringConstant string length before truncation")     \
3856           range(32, 32*K)                                                   \
3857                                                                             \
3858   product(bool, PerfAllowAtExitRegistration, false,                         \
3859           "Allow registration of atexit() methods")                         \
3860                                                                             \
3861   product(bool, PerfBypassFileSystemCheck, false,                           \
3862           "Bypass Win32 file system criteria checks (Windows Only)")        \
3863                                                                             \
3864   product(intx, UnguardOnExecutionViolation, 0,                             \
3865           "Unguard page and retry on no-execute fault (Win32 only) "        \
3866           "0=off, 1=conservative, 2=aggressive")                            \
3867           range(0, 2)                                                       \
3868                                                                             \
3869   product(bool, EnableConcGCPerfCounter, false,                             \
3870           "Enable PerfCounter for STW in CMS GC")                           \
3871                                                                             \
3872   /* Serviceability Support */                                              \
3873                                                                             \
3874   product(bool, ManagementServer, false,                                    \
3875           "Create JMX Management Server")                                   \
3876                                                                             \
3877   product(bool, DisableAttachMechanism, false,                              \
3878           "Disable mechanism that allows tools to attach to this VM")       \
3879                                                                             \
3880   product(bool, StartAttachListener, false,                                 \
3881           "Always start Attach Listener at VM startup")                     \
3882                                                                             \
3883   product(bool, EnableDynamicAgentLoading, true,                            \
3884           "Allow tools to load agents with the attach mechanism")           \
3885                                                                             \
3886   manageable(bool, PrintConcurrentLocks, false,                             \
3887           "Print java.util.concurrent locks in thread dump")                \
3888                                                                             \
3889   product(bool, TransmitErrorReport, false,                                 \
3890           "Enable error report transmission on erroneous termination")      \
3891                                                                             \
3892   product(ccstr, ErrorReportServer, NULL,                                   \
3893           "Override built-in error report server address")                  \
3894                                                                             \
3895   /* Shared spaces */                                                       \
3896                                                                             \
3897   product(bool, UseSharedSpaces, true,                                      \
3898           "Use shared spaces for metadata")                                 \
3899                                                                             \
3900   product(bool, VerifySharedSpaces, false,                                  \
3901           "Verify shared spaces (false for default archive, true for "      \
3902           "archive specified by -XX:SharedArchiveFile)")                    \
3903                                                                             \
3904   product(bool, RequireSharedSpaces, false,                                 \
3905           "Require shared spaces for metadata")                             \
3906                                                                             \
3907   product(bool, DumpSharedSpaces, false,                                    \
3908           "Special mode: JVM reads a class list, loads classes, builds "    \
3909           "shared spaces, and dumps the shared spaces to a file to be "     \
3910           "used in future JVM runs")                                        \
3911                                                                             \
3912   product(bool, PrintSharedArchiveAndExit, false,                           \
3913           "Print shared archive file contents")                             \
3914                                                                             \
3915   product(bool, PrintSharedDictionary, false,                               \
3916           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3917           "dictionary")                                                     \
3918                                                                             \
3919   product(size_t, SharedReadWriteSize, 0,                                   \
3920           "Deprecated")                                                     \
3921                                                                             \
3922   product(size_t, SharedReadOnlySize, 0,                                    \
3923           "Deprecated")                                                     \
3924                                                                             \
3925   product(size_t, SharedMiscDataSize,  0,                                   \
3926           "Deprecated")                                                     \
3927                                                                             \
3928   product(size_t, SharedMiscCodeSize,  0,                                   \
3929           "Deprecated")                                                     \
3930                                                                             \
3931   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
3932           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3933           "Address to allocate shared memory region for class data")        \
3934           range(0, SIZE_MAX)                                                \
3935                                                                             \
3936   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3937           "Average number of symbols per bucket in shared table")           \
3938           range(2, 246)                                                     \
3939                                                                             \
3940   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3941           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3942           "classes. Just exclude them from the shared dictionary.")         \
3943                                                                             \
3944   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3945           "Print generated stub code for method handles")                   \
3946                                                                             \
3947   develop(bool, TraceMethodHandles, false,                                  \
3948           "trace internal method handle operations")                        \
3949                                                                             \
3950   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3951           "perform extra checks when constructing method handles")          \
3952                                                                             \
3953   diagnostic(bool, ShowHiddenFrames, false,                                 \
3954           "show method handle implementation frames (usually hidden)")      \
3955                                                                             \
3956   experimental(bool, TrustFinalNonStaticFields, false,                      \
3957           "trust final non-static declarations for constant folding")       \
3958                                                                             \
3959   diagnostic(bool, FoldStableValues, true,                                  \
3960           "Optimize loads from stable fields (marked w/ @Stable)")          \
3961                                                                             \
3962   develop(bool, TraceInvokeDynamic, false,                                  \
3963           "trace internal invoke dynamic operations")                       \
3964                                                                             \
3965   diagnostic(bool, PauseAtStartup,      false,                              \
3966           "Causes the VM to pause at startup time and wait for the pause "  \
3967           "file to be removed (default: ./vm.paused.<pid>)")                \
3968                                                                             \
3969   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3970           "The file to create and for whose removal to await when pausing " \
3971           "at startup. (default: ./vm.paused.<pid>)")                       \
3972                                                                             \
3973   diagnostic(bool, PauseAtExit, false,                                      \
3974           "Pause and wait for keypress on exit if a debugger is attached")  \
3975                                                                             \
3976   product(bool, ExtendedDTraceProbes,    false,                             \
3977           "Enable performance-impacting dtrace probes")                     \
3978                                                                             \
3979   product(bool, DTraceMethodProbes, false,                                  \
3980           "Enable dtrace probes for method-entry and method-exit")          \
3981                                                                             \
3982   product(bool, DTraceAllocProbes, false,                                   \
3983           "Enable dtrace probes for object allocation")                     \
3984                                                                             \
3985   product(bool, DTraceMonitorProbes, false,                                 \
3986           "Enable dtrace probes for monitor events")                        \
3987                                                                             \
3988   product(bool, RelaxAccessControlCheck, false,                             \
3989           "Relax the access control checks in the verifier")                \
3990                                                                             \
3991   product(uintx, StringTableSize, defaultStringTableSize,                   \
3992           "Number of buckets in the interned String table")                 \
3993           range(minimumStringTableSize, 111*defaultStringTableSize)         \
3994                                                                             \
3995   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3996           "Number of buckets in the JVM internal Symbol table")             \
3997           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
3998                                                                             \
3999   product(bool, UseStringDeduplication, false,                              \
4000           "Use string deduplication")                                       \
4001                                                                             \
4002   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4003           "A string must reach this age (or be promoted to an old region) " \
4004           "to be considered for deduplication")                             \
4005           range(1, markOopDesc::max_age)                                    \
4006                                                                             \
4007   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4008           "Force table resize every time the table is scanned")             \
4009                                                                             \
4010   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4011           "Force table rehash every time the table is scanned")             \
4012                                                                             \
4013   diagnostic(bool, WhiteBoxAPI, false,                                      \
4014           "Enable internal testing APIs")                                   \
4015                                                                             \
4016   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4017            "Default survivor space alignment in bytes")                     \
4018            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4019                                                                             \
4020   product(bool , AllowNonVirtualCalls, false,                               \
4021           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4022                                                                             \
4023   product(ccstr, DumpLoadedClassList, NULL,                                 \
4024           "Dump the names all loaded classes, that could be stored into "   \
4025           "the CDS archive, in the specified file")                         \
4026                                                                             \
4027   product(ccstr, SharedClassListFile, NULL,                                 \
4028           "Override the default CDS class list")                            \
4029                                                                             \
4030   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4031           "Override the default location of the CDS archive file")          \
4032                                                                             \
4033   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4034           "Extra classlist for building the CDS archive file")              \
4035                                                                             \
4036   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4037           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4038           "Allocation less than this value will be allocated "              \
4039           "using malloc. Larger allocations will use mmap.")                \
4040                                                                             \
4041   experimental(bool, AlwaysAtomicAccesses, false,                           \
4042           "Accesses to all variables should always be atomic")              \
4043                                                                             \
4044   product(bool, EnableTracing, false,                                       \
4045           "Enable event-based tracing")                                     \
4046                                                                             \
4047   product(bool, UseLockedTracing, false,                                    \
4048           "Use locked-tracing when doing event-based tracing")              \
4049                                                                             \
4050   diagnostic(bool, UseUnalignedAccesses, false,                             \
4051           "Use unaligned memory accesses in Unsafe")                        \
4052                                                                             \
4053   product_pd(bool, PreserveFramePointer,                                    \
4054              "Use the FP register for holding the frame pointer "           \
4055              "and not as a general purpose register.")                      \
4056                                                                             \
4057   diagnostic(bool, CheckIntrinsics, true,                                   \
4058              "When a class C is loaded, check that "                        \
4059              "(1) all intrinsics defined by the VM for class C are present "\
4060              "in the loaded class file and are marked with the "            \
4061              "@HotSpotIntrinsicCandidate annotation, that "                 \
4062              "(2) there is an intrinsic registered for all loaded methods " \
4063              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4064              "annotation, and that "                                        \
4065              "(3) no orphan methods exist for class C (i.e., methods for "  \
4066              "which the VM declares an intrinsic but that are not declared "\
4067              "in the loaded class C. "                                      \
4068              "Check (3) is available only in debug builds.")                \
4069                                                                             \
4070   diagnostic_pd(intx, InitArrayShortSize,                                   \
4071           "Threshold small size (in bytes) for clearing arrays. "           \
4072           "Anything this size or smaller may get converted to discrete "    \
4073           "scalar stores.")                                                 \
4074           range(0, max_intx)                                                \
4075           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4076                                                                             \
4077   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4078              "Disable backwards compatibility for compile commands.")       \
4079                                                                             \
4080   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4081              "Print compiler directives on installation.")                  \
4082   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4083              "Limit on number of compiler directives.")
4084 
4085 
4086 /*
4087  *  Macros for factoring of globals
4088  */
4089 
4090 // Interface macros
4091 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4092 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4093 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4094 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4095 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4096 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4097 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4098 #ifdef PRODUCT
4099 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4100 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4101 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4102 #else
4103 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4104 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4105 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4106 #endif // PRODUCT
4107 // Special LP64 flags, product only needed for now.
4108 #ifdef _LP64
4109 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4110 #else
4111 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4112 #endif // _LP64
4113 
4114 // Implementation macros
4115 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4116 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4117 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4118 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4119 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4120 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4121 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4122 #ifdef PRODUCT
4123 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4124 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4125 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4126 #else
4127 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4128 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4129 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4130 #endif // PRODUCT
4131 #ifdef _LP64
4132 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4133 #else
4134 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4135 #endif // _LP64
4136 
4137 // Only materialize src code for range checking when required, ignore otherwise
4138 #define IGNORE_RANGE(a, b)
4139 // Only materialize src code for contraint checking when required, ignore otherwise
4140 #define IGNORE_CONSTRAINT(func,type)
4141 
4142 #define IGNORE_WRITEABLE(type)
4143 
4144 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4145               DECLARE_PD_DEVELOPER_FLAG, \
4146               DECLARE_PRODUCT_FLAG, \
4147               DECLARE_PD_PRODUCT_FLAG, \
4148               DECLARE_DIAGNOSTIC_FLAG, \
4149               DECLARE_PD_DIAGNOSTIC_FLAG, \
4150               DECLARE_EXPERIMENTAL_FLAG, \
4151               DECLARE_NOTPRODUCT_FLAG, \
4152               DECLARE_MANAGEABLE_FLAG, \
4153               DECLARE_PRODUCT_RW_FLAG, \
4154               DECLARE_LP64_PRODUCT_FLAG, \
4155               IGNORE_RANGE, \
4156               IGNORE_CONSTRAINT, \
4157               IGNORE_WRITEABLE)
4158 
4159 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4160                  DECLARE_PD_DEVELOPER_FLAG, \
4161                  DECLARE_PRODUCT_FLAG, \
4162                  DECLARE_PD_PRODUCT_FLAG, \
4163                  DECLARE_DIAGNOSTIC_FLAG, \
4164                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4165                  DECLARE_NOTPRODUCT_FLAG, \
4166                  IGNORE_RANGE, \
4167                  IGNORE_CONSTRAINT, \
4168                  IGNORE_WRITEABLE)
4169 
4170 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4171            DECLARE_PRODUCT_FLAG, \
4172            DECLARE_DIAGNOSTIC_FLAG, \
4173            DECLARE_EXPERIMENTAL_FLAG, \
4174            DECLARE_NOTPRODUCT_FLAG, \
4175            IGNORE_RANGE, \
4176            IGNORE_CONSTRAINT, \
4177            IGNORE_WRITEABLE)
4178 
4179 // Extensions
4180 
4181 #include "runtime/globals_ext.hpp"
4182 
4183 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP