1 /*
   2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #if !defined(COMPILER1) && !defined(COMPILER2)
  26 define_pd_global(bool, BackgroundCompilation,        false);
  27 define_pd_global(bool, UseTLAB,                      false);
  28 define_pd_global(bool, CICompileOSR,                 false);
  29 define_pd_global(bool, UseTypeProfile,               false);
  30 define_pd_global(bool, UseOnStackReplacement,        false);
  31 define_pd_global(bool, InlineIntrinsics,             false);
  32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  33 define_pd_global(bool, ProfileInterpreter,           false);
  34 define_pd_global(bool, ProfileTraps,                 false);
  35 define_pd_global(bool, TieredCompilation,            false);
  36 
  37 define_pd_global(intx, CompileThreshold,             0);
  38 define_pd_global(intx, Tier2CompileThreshold,        0);
  39 define_pd_global(intx, Tier3CompileThreshold,        0);
  40 define_pd_global(intx, Tier4CompileThreshold,        0);
  41 
  42 define_pd_global(intx, BackEdgeThreshold,            0);
  43 define_pd_global(intx, Tier2BackEdgeThreshold,       0);
  44 define_pd_global(intx, Tier3BackEdgeThreshold,       0);
  45 define_pd_global(intx, Tier4BackEdgeThreshold,       0);
  46 
  47 define_pd_global(intx, OnStackReplacePercentage,     0);
  48 define_pd_global(bool, ResizeTLAB,                   false);
  49 define_pd_global(intx, FreqInlineSize,               0);
  50 define_pd_global(intx, InlineSmallCode,              0);
  51 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
  52 define_pd_global(intx, NewRatio,                     4);
  53 define_pd_global(intx, InlineClassNatives,           true);
  54 define_pd_global(intx, InlineUnsafeOps,              true);
  55 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  56 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  57 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  58 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  59 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
  60 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
  61 define_pd_global(bool, NeverActAsServerClassMachine, true);
  62 define_pd_global(uintx, DefaultMaxRAM,               1*G);
  63 #define CI_COMPILER_COUNT 0
  64 #else
  65 
  66 #ifdef COMPILER2
  67 #define CI_COMPILER_COUNT 2
  68 #else
  69 #define CI_COMPILER_COUNT 1
  70 #endif // COMPILER2
  71 
  72 #endif // no compilers
  73 
  74 
  75 // string type aliases used only in this file
  76 typedef const char* ccstr;
  77 typedef const char* ccstrlist;   // represents string arguments which accumulate
  78 
  79 enum FlagValueOrigin {
  80   DEFAULT          = 0,
  81   COMMAND_LINE     = 1,
  82   ENVIRON_VAR      = 2,
  83   CONFIG_FILE      = 3,
  84   MANAGEMENT       = 4,
  85   ERGONOMIC        = 5,
  86   ATTACH_ON_DEMAND = 6,
  87   INTERNAL         = 99
  88 };
  89 
  90 struct Flag {
  91   const char *type;
  92   const char *name;
  93   void*       addr;
  94   const char *kind;
  95   FlagValueOrigin origin;
  96 
  97   // points to all Flags static array
  98   static Flag *flags;
  99 
 100   // number of flags
 101   static size_t numFlags;
 102 
 103   static Flag* find_flag(char* name, size_t length);
 104 
 105   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 106   bool get_bool() const       { return *((bool*) addr); }
 107   void set_bool(bool value)   { *((bool*) addr) = value; }
 108 
 109   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 110   intx get_intx() const       { return *((intx*) addr); }
 111   void set_intx(intx value)   { *((intx*) addr) = value; }
 112 
 113   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 114   uintx get_uintx() const     { return *((uintx*) addr); }
 115   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 116 
 117   bool is_double() const        { return strcmp(type, "double") == 0; }
 118   double get_double() const     { return *((double*) addr); }
 119   void set_double(double value) { *((double*) addr) = value; }
 120 
 121   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 122   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 123   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 124   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 125 
 126   bool is_unlocker() const;
 127   bool is_unlocked() const;
 128   bool is_writeable() const;
 129   bool is_external() const;
 130 
 131   void print_on(outputStream* st);
 132   void print_as_flag(outputStream* st);
 133 };
 134 
 135 // debug flags control various aspects of the VM and are global accessible
 136 
 137 // use FlagSetting to temporarily change some debug flag
 138 // e.g. FlagSetting fs(DebugThisAndThat, true);
 139 // restored to previous value upon leaving scope
 140 class FlagSetting {
 141   bool val;
 142   bool* flag;
 143  public:
 144   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 145   ~FlagSetting()                       { *flag = val; }
 146 };
 147 
 148 
 149 class CounterSetting {
 150   intx* counter;
 151  public:
 152   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 153   ~CounterSetting()         { (*counter)--; }
 154 };
 155 
 156 
 157 class IntFlagSetting {
 158   intx val;
 159   intx* flag;
 160  public:
 161   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 162   ~IntFlagSetting()                       { *flag = val; }
 163 };
 164 
 165 
 166 class DoubleFlagSetting {
 167   double val;
 168   double* flag;
 169  public:
 170   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 171   ~DoubleFlagSetting()                           { *flag = val; }
 172 };
 173 
 174 
 175 class CommandLineFlags {
 176  public:
 177   static bool boolAt(char* name, size_t len, bool* value);
 178   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 179   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 180   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 181 
 182   static bool intxAt(char* name, size_t len, intx* value);
 183   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 184   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 185   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 186 
 187   static bool uintxAt(char* name, size_t len, uintx* value);
 188   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 189   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 190   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 191 
 192   static bool doubleAt(char* name, size_t len, double* value);
 193   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 194   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 195   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 196 
 197   static bool ccstrAt(char* name, size_t len, ccstr* value);
 198   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 199   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 200   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 201 
 202   // Returns false if name is not a command line flag.
 203   static bool wasSetOnCmdline(const char* name, bool* value);
 204   static void printSetFlags();
 205 
 206   static void printFlags() PRODUCT_RETURN;
 207 
 208   static void verify() PRODUCT_RETURN;
 209 };
 210 
 211 // use this for flags that are true by default in the debug version but
 212 // false in the optimized version, and vice versa
 213 #ifdef ASSERT
 214 #define trueInDebug  true
 215 #define falseInDebug false
 216 #else
 217 #define trueInDebug  false
 218 #define falseInDebug true
 219 #endif
 220 
 221 // use this for flags that are true per default in the product build
 222 // but false in development builds, and vice versa
 223 #ifdef PRODUCT
 224 #define trueInProduct  true
 225 #define falseInProduct false
 226 #else
 227 #define trueInProduct  false
 228 #define falseInProduct true
 229 #endif
 230 
 231 // use this for flags that are true per default in the tiered build
 232 // but false in non-tiered builds, and vice versa
 233 #ifdef TIERED
 234 #define  trueInTiered true
 235 #define falseInTiered false
 236 #else
 237 #define  trueInTiered false
 238 #define falseInTiered true
 239 #endif
 240 
 241 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 242 // product flags are always settable / visible
 243 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 244 
 245 // A flag must be declared with one of the following types:
 246 // bool, intx, uintx, ccstr.
 247 // The type "ccstr" is an alias for "const char*" and is used
 248 // only in this file, because the macrology requires single-token type names.
 249 
 250 // Note: Diagnostic options not meant for VM tuning or for product modes.
 251 // They are to be used for VM quality assurance or field diagnosis
 252 // of VM bugs.  They are hidden so that users will not be encouraged to
 253 // try them as if they were VM ordinary execution options.  However, they
 254 // are available in the product version of the VM.  Under instruction
 255 // from support engineers, VM customers can turn them on to collect
 256 // diagnostic information about VM problems.  To use a VM diagnostic
 257 // option, you must first specify +UnlockDiagnosticVMOptions.
 258 // (This master switch also affects the behavior of -Xprintflags.)
 259 //
 260 // experimental flags are in support of features that are not
 261 //    part of the officially supported product, but are available
 262 //    for experimenting with. They could, for example, be performance
 263 //    features that may not have undergone full or rigorous QA, but which may
 264 //    help performance in some cases and released for experimentation
 265 //    by the community of users and developers. This flag also allows one to
 266 //    be able to build a fully supported product that nonetheless also
 267 //    ships with some unsupported, lightly tested, experimental features.
 268 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 269 //    UnlockExperimentalVMOptions flag, which allows the control and
 270 //    modification of the experimental flags.
 271 //
 272 // manageable flags are writeable external product flags.
 273 //    They are dynamically writeable through the JDK management interface
 274 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 275 //    These flags are external exported interface (see CCC).  The list of
 276 //    manageable flags can be queried programmatically through the management
 277 //    interface.
 278 //
 279 //    A flag can be made as "manageable" only if
 280 //    - the flag is defined in a CCC as an external exported interface.
 281 //    - the VM implementation supports dynamic setting of the flag.
 282 //      This implies that the VM must *always* query the flag variable
 283 //      and not reuse state related to the flag state at any given time.
 284 //    - you want the flag to be queried programmatically by the customers.
 285 //
 286 // product_rw flags are writeable internal product flags.
 287 //    They are like "manageable" flags but for internal/private use.
 288 //    The list of product_rw flags are internal/private flags which
 289 //    may be changed/removed in a future release.  It can be set
 290 //    through the management interface to get/set value
 291 //    when the name of flag is supplied.
 292 //
 293 //    A flag can be made as "product_rw" only if
 294 //    - the VM implementation supports dynamic setting of the flag.
 295 //      This implies that the VM must *always* query the flag variable
 296 //      and not reuse state related to the flag state at any given time.
 297 //
 298 // Note that when there is a need to support develop flags to be writeable,
 299 // it can be done in the same way as product_rw.
 300 
 301 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 302                                                                             \
 303   lp64_product(bool, UseCompressedOops, false,                              \
 304             "Use 32-bit object references in 64-bit VM. "                   \
 305             "lp64_product means flag is always constant in 32 bit VM")      \
 306                                                                             \
 307   notproduct(bool, CheckCompressedOops, true,                               \
 308             "generate checks in encoding/decoding code in debug VM")        \
 309                                                                             \
 310   product_pd(uintx, HeapBaseMinAddress,                                     \
 311             "OS specific low limit for heap base address")                  \
 312                                                                             \
 313   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 314             "Print compressed oops base address and encoding mode")         \
 315                                                                             \
 316   /* UseMembar is theoretically a temp flag used for memory barrier         \
 317    * removal testing.  It was supposed to be removed before FCS but has     \
 318    * been re-added (see 6401008) */                                         \
 319   product(bool, UseMembar, false,                                           \
 320           "(Unstable) Issues membars on thread state transitions")          \
 321                                                                             \
 322   product(bool, PrintCommandLineFlags, false,                               \
 323           "Prints flags that appeared on the command line")                 \
 324                                                                             \
 325   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 326           "Enable normal processing of flags relating to field diagnostics")\
 327                                                                             \
 328   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 329           "Enable normal processing of flags relating to experimental features")\
 330                                                                             \
 331   product(bool, JavaMonitorsInStackTrace, true,                             \
 332           "Print info. about Java monitor locks when the stacks are dumped")\
 333                                                                             \
 334   product_pd(bool, UseLargePages,                                           \
 335           "Use large page memory")                                          \
 336                                                                             \
 337   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 338           "Allocate large pages individually for better affinity")          \
 339                                                                             \
 340   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 341           "Fail large pages individual allocation")                         \
 342                                                                             \
 343   develop(bool, TracePageSizes, false,                                      \
 344           "Trace page size selection and usage.")                           \
 345                                                                             \
 346   product(bool, UseNUMA, false,                                             \
 347           "Use NUMA if available")                                          \
 348                                                                             \
 349   product(bool, ForceNUMA, false,                                           \
 350           "Force NUMA optimizations on single-node/UMA systems")            \
 351                                                                             \
 352   product(intx, NUMAChunkResizeWeight, 20,                                  \
 353           "Percentage (0-100) used to weight the current sample when "      \
 354           "computing exponentially decaying average for "                   \
 355           "AdaptiveNUMAChunkSizing")                                        \
 356                                                                             \
 357   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 358           "Do not reallocate more that this amount per collection")         \
 359                                                                             \
 360   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 361           "Enable adaptive chunk sizing for NUMA")                          \
 362                                                                             \
 363   product(bool, NUMAStats, false,                                           \
 364           "Print NUMA stats in detailed heap information")                  \
 365                                                                             \
 366   product(intx, NUMAPageScanRate, 256,                                      \
 367           "Maximum number of pages to include in the page scan procedure")  \
 368                                                                             \
 369   product_pd(bool, NeedsDeoptSuspend,                                       \
 370           "True for register window machines (sparc/ia64)")                 \
 371                                                                             \
 372   product(intx, UseSSE, 99,                                                 \
 373           "Highest supported SSE instructions set on x86/x64")              \
 374                                                                             \
 375   product(uintx, LargePageSizeInBytes, 0,                                   \
 376           "Large page size (0 to let VM choose the page size")              \
 377                                                                             \
 378   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 379           "Use large pages if max heap is at least this big")               \
 380                                                                             \
 381   product(bool, ForceTimeHighResolution, false,                             \
 382           "Using high time resolution(For Win32 only)")                     \
 383                                                                             \
 384   develop(bool, TraceItables, false,                                        \
 385           "Trace initialization and use of itables")                        \
 386                                                                             \
 387   develop(bool, TracePcPatching, false,                                     \
 388           "Trace usage of frame::patch_pc")                                 \
 389                                                                             \
 390   develop(bool, TraceJumps, false,                                          \
 391           "Trace assembly jumps in thread ring buffer")                     \
 392                                                                             \
 393   develop(bool, TraceRelocator, false,                                      \
 394           "Trace the bytecode relocator")                                   \
 395                                                                             \
 396   develop(bool, TraceLongCompiles, false,                                   \
 397           "Print out every time compilation is longer than "                \
 398           "a given threashold")                                             \
 399                                                                             \
 400   develop(bool, SafepointALot, false,                                       \
 401           "Generates a lot of safepoints. Works with "                      \
 402           "GuaranteedSafepointInterval")                                    \
 403                                                                             \
 404   product_pd(bool, BackgroundCompilation,                                   \
 405           "A thread requesting compilation is not blocked during "          \
 406           "compilation")                                                    \
 407                                                                             \
 408   product(bool, PrintVMQWaitTime, false,                                    \
 409           "Prints out the waiting time in VM operation queue")              \
 410                                                                             \
 411   develop(bool, BailoutToInterpreterForThrows, false,                       \
 412           "Compiled methods which throws/catches exceptions will be "       \
 413           "deopt and intp.")                                                \
 414                                                                             \
 415   develop(bool, NoYieldsInMicrolock, false,                                 \
 416           "Disable yields in microlock")                                    \
 417                                                                             \
 418   develop(bool, TraceOopMapGeneration, false,                               \
 419           "Shows oopmap generation")                                        \
 420                                                                             \
 421   product(bool, MethodFlushing, true,                                       \
 422           "Reclamation of zombie and not-entrant methods")                  \
 423                                                                             \
 424   develop(bool, VerifyStack, false,                                         \
 425           "Verify stack of each thread when it is entering a runtime call") \
 426                                                                             \
 427   develop(bool, ForceUnreachable, false,                                    \
 428           "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
 429                                                                             \
 430   notproduct(bool, StressDerivedPointers, false,                            \
 431           "Force scavenge when a derived pointers is detected on stack "    \
 432           "after rtm call")                                                 \
 433                                                                             \
 434   develop(bool, TraceDerivedPointers, false,                                \
 435           "Trace traversal of derived pointers on stack")                   \
 436                                                                             \
 437   notproduct(bool, TraceCodeBlobStacks, false,                              \
 438           "Trace stack-walk of codeblobs")                                  \
 439                                                                             \
 440   product(bool, PrintJNIResolving, false,                                   \
 441           "Used to implement -v:jni")                                       \
 442                                                                             \
 443   notproduct(bool, PrintRewrites, false,                                    \
 444           "Print methods that are being rewritten")                         \
 445                                                                             \
 446   product(bool, UseInlineCaches, true,                                      \
 447           "Use Inline Caches for virtual calls ")                           \
 448                                                                             \
 449   develop(bool, InlineArrayCopy, true,                                      \
 450           "inline arraycopy native that is known to be part of "            \
 451           "base library DLL")                                               \
 452                                                                             \
 453   develop(bool, InlineObjectHash, true,                                     \
 454           "inline Object::hashCode() native that is known to be part "      \
 455           "of base library DLL")                                            \
 456                                                                             \
 457   develop(bool, InlineObjectCopy, true,                                     \
 458           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 459                                                                             \
 460   develop(bool, InlineNatives, true,                                        \
 461           "inline natives that are known to be part of base library DLL")   \
 462                                                                             \
 463   develop(bool, InlineMathNatives, true,                                    \
 464           "inline SinD, CosD, etc.")                                        \
 465                                                                             \
 466   develop(bool, InlineClassNatives, true,                                   \
 467           "inline Class.isInstance, etc")                                   \
 468                                                                             \
 469   develop(bool, InlineAtomicLong, true,                                     \
 470           "inline sun.misc.AtomicLong")                                     \
 471                                                                             \
 472   develop(bool, InlineThreadNatives, true,                                  \
 473           "inline Thread.currentThread, etc")                               \
 474                                                                             \
 475   develop(bool, InlineReflectionGetCallerClass, true,                       \
 476           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 477           "of base library DLL")                                            \
 478                                                                             \
 479   develop(bool, InlineUnsafeOps, true,                                      \
 480           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 481                                                                             \
 482   develop(bool, ConvertCmpD2CmpF, true,                                     \
 483           "Convert cmpD to cmpF when one input is constant in float range") \
 484                                                                             \
 485   develop(bool, ConvertFloat2IntClipping, true,                             \
 486           "Convert float2int clipping idiom to integer clipping")           \
 487                                                                             \
 488   develop(bool, SpecialStringCompareTo, true,                               \
 489           "special version of string compareTo")                            \
 490                                                                             \
 491   develop(bool, SpecialStringIndexOf, true,                                 \
 492           "special version of string indexOf")                              \
 493                                                                             \
 494   develop(bool, SpecialStringEquals, true,                                  \
 495           "special version of string equals")                               \
 496                                                                             \
 497   develop(bool, SpecialArraysEquals, true,                                  \
 498           "special version of Arrays.equals(char[],char[])")                \
 499                                                                             \
 500   product(bool, UseSSE42Intrinsics, false,                                  \
 501           "SSE4.2 versions of intrinsics")                                  \
 502                                                                             \
 503   develop(bool, TraceCallFixup, false,                                      \
 504           "traces all call fixups")                                         \
 505                                                                             \
 506   develop(bool, DeoptimizeALot, false,                                      \
 507           "deoptimize at every exit from the runtime system")               \
 508                                                                             \
 509   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 510           "a comma separated list of bcis to deoptimize at")                \
 511                                                                             \
 512   product(bool, DeoptimizeRandom, false,                                    \
 513           "deoptimize random frames on random exit from the runtime system")\
 514                                                                             \
 515   notproduct(bool, ZombieALot, false,                                       \
 516           "creates zombies (non-entrant) at exit from the runt. system")    \
 517                                                                             \
 518   notproduct(bool, WalkStackALot, false,                                    \
 519           "trace stack (no print) at every exit from the runtime system")   \
 520                                                                             \
 521   develop(bool, Debugging, false,                                           \
 522           "set when executing debug methods in debug.ccp "                  \
 523           "(to prevent triggering assertions)")                             \
 524                                                                             \
 525   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 526           "Enable strict checks that safepoints cannot happen for threads " \
 527           "that used No_Safepoint_Verifier")                                \
 528                                                                             \
 529   notproduct(bool, VerifyLastFrame, false,                                  \
 530           "Verify oops on last frame on entry to VM")                       \
 531                                                                             \
 532   develop(bool, TraceHandleAllocation, false,                               \
 533           "Prints out warnings when suspicious many handles are allocated") \
 534                                                                             \
 535   product(bool, UseCompilerSafepoints, true,                                \
 536           "Stop at safepoints in compiled code")                            \
 537                                                                             \
 538   product(bool, UseSplitVerifier, true,                                     \
 539           "use split verifier with StackMapTable attributes")               \
 540                                                                             \
 541   product(bool, FailOverToOldVerifier, true,                                \
 542           "fail over to old verifier when split verifier fails")            \
 543                                                                             \
 544   develop(bool, ShowSafepointMsgs, false,                                   \
 545           "Show msg. about safepoint synch.")                               \
 546                                                                             \
 547   product(bool, SafepointTimeout, false,                                    \
 548           "Time out and warn or fail after SafepointTimeoutDelay "          \
 549           "milliseconds if failed to reach safepoint")                      \
 550                                                                             \
 551   develop(bool, DieOnSafepointTimeout, false,                               \
 552           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 553                                                                             \
 554   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 555   /* typically, at most a few retries are needed */                         \
 556   product(intx, SuspendRetryCount, 50,                                      \
 557           "Maximum retry count for an external suspend request")            \
 558                                                                             \
 559   product(intx, SuspendRetryDelay, 5,                                       \
 560           "Milliseconds to delay per retry (* current_retry_count)")        \
 561                                                                             \
 562   product(bool, AssertOnSuspendWaitFailure, false,                          \
 563           "Assert/Guarantee on external suspend wait failure")              \
 564                                                                             \
 565   product(bool, TraceSuspendWaitFailures, false,                            \
 566           "Trace external suspend wait failures")                           \
 567                                                                             \
 568   product(bool, MaxFDLimit, true,                                           \
 569           "Bump the number of file descriptors to max in solaris.")         \
 570                                                                             \
 571   notproduct(bool, LogEvents, trueInDebug,                                  \
 572           "Enable Event log")                                               \
 573                                                                             \
 574   product(bool, BytecodeVerificationRemote, true,                           \
 575           "Enables the Java bytecode verifier for remote classes")          \
 576                                                                             \
 577   product(bool, BytecodeVerificationLocal, false,                           \
 578           "Enables the Java bytecode verifier for local classes")           \
 579                                                                             \
 580   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 581           "Force exceptions on FP stack under/overflow")                    \
 582                                                                             \
 583   develop(bool, SoftMatchFailure, trueInProduct,                            \
 584           "If the DFA fails to match a node, print a message and bail out") \
 585                                                                             \
 586   develop(bool, VerifyStackAtCalls, false,                                  \
 587           "Verify that the stack pointer is unchanged after calls")         \
 588                                                                             \
 589   develop(bool, TraceJavaAssertions, false,                                 \
 590           "Trace java language assertions")                                 \
 591                                                                             \
 592   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 593           "temporary - see javaClasses.cpp")                                \
 594                                                                             \
 595   notproduct(bool, PrintMallocFree, false,                                  \
 596           "Trace calls to C heap malloc/free allocation")                   \
 597                                                                             \
 598   notproduct(bool, PrintOopAddress, false,                                  \
 599           "Always print the location of the oop")                           \
 600                                                                             \
 601   notproduct(bool, VerifyCodeCacheOften, false,                             \
 602           "Verify compiled-code cache often")                               \
 603                                                                             \
 604   develop(bool, ZapDeadCompiledLocals, false,                               \
 605           "Zap dead locals in compiler frames")                             \
 606                                                                             \
 607   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 608           "Zap dead locals (old version, zaps all frames when "             \
 609           "entering the VM")                                                \
 610                                                                             \
 611   notproduct(bool, CheckOopishValues, false,                                \
 612           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 613                                                                             \
 614   develop(bool, UseMallocOnly, false,                                       \
 615           "use only malloc/free for allocation (no resource area/arena)")   \
 616                                                                             \
 617   develop(bool, PrintMalloc, false,                                         \
 618           "print all malloc/free calls")                                    \
 619                                                                             \
 620   develop(bool, ZapResourceArea, trueInDebug,                               \
 621           "Zap freed resource/arena space with 0xABABABAB")                 \
 622                                                                             \
 623   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 624           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 625                                                                             \
 626   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 627           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 628                                                                             \
 629   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 630           "Zap unused heap space with 0xBAADBABE")                          \
 631                                                                             \
 632   develop(bool, TraceZapUnusedHeapArea, false,                              \
 633           "Trace zapping of unused heap space")                             \
 634                                                                             \
 635   develop(bool, CheckZapUnusedHeapArea, false,                              \
 636           "Check zapping of unused heap space")                             \
 637                                                                             \
 638   develop(bool, ZapFillerObjects, trueInDebug,                              \
 639           "Zap filler objects with 0xDEAFBABE")                             \
 640                                                                             \
 641   develop(bool, PrintVMMessages, true,                                      \
 642           "Print vm messages on console")                                   \
 643                                                                             \
 644   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 645           "Print the time the application has been running")                \
 646                                                                             \
 647   product(bool, PrintGCApplicationStoppedTime, false,                       \
 648           "Print the time the application has been stopped")                \
 649                                                                             \
 650   develop(bool, Verbose, false,                                             \
 651           "Prints additional debugging information from other modes")       \
 652                                                                             \
 653   develop(bool, PrintMiscellaneous, false,                                  \
 654           "Prints uncategorized debugging information (requires +Verbose)") \
 655                                                                             \
 656   develop(bool, WizardMode, false,                                          \
 657           "Prints much more debugging information")                         \
 658                                                                             \
 659   product(bool, ShowMessageBoxOnError, false,                               \
 660           "Keep process alive on VM fatal error")                           \
 661                                                                             \
 662   product_pd(bool, UseOSErrorReporting,                                     \
 663           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 664                                                                             \
 665   product(bool, SuppressFatalErrorMessage, false,                           \
 666           "Do NO Fatal Error report [Avoid deadlock]")                      \
 667                                                                             \
 668   product(ccstrlist, OnError, "",                                           \
 669           "Run user-defined commands on fatal error; see VMError.cpp "      \
 670           "for examples")                                                   \
 671                                                                             \
 672   product(ccstrlist, OnOutOfMemoryError, "",                                \
 673           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 674                                                                             \
 675   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 676           "Dump heap to file before any major stop-world GC")               \
 677                                                                             \
 678   manageable(bool, HeapDumpAfterFullGC, false,                              \
 679           "Dump heap to file after any major stop-world GC")                \
 680                                                                             \
 681   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 682           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 683                                                                             \
 684   manageable(ccstr, HeapDumpPath, NULL,                                     \
 685           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 686           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 687           "in the working directory)")                                      \
 688                                                                             \
 689   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 690           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 691           "when the heap usage is larger than this")                        \
 692                                                                             \
 693   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 694           "Approximate segment size when generating a segmented heap dump") \
 695                                                                             \
 696   develop(bool, BreakAtWarning, false,                                      \
 697           "Execute breakpoint upon encountering VM warning")                \
 698                                                                             \
 699   product_pd(bool, UseVectoredExceptions,                                   \
 700           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 701                                                                             \
 702   develop(bool, TraceVMOperation, false,                                    \
 703           "Trace vm operations")                                            \
 704                                                                             \
 705   develop(bool, UseFakeTimers, false,                                       \
 706           "Tells whether the VM should use system time or a fake timer")    \
 707                                                                             \
 708   diagnostic(bool, LogCompilation, false,                                   \
 709           "Log compilation activity in detail to hotspot.log or LogFile")   \
 710                                                                             \
 711   product(bool, PrintCompilation, false,                                    \
 712           "Print compilations")                                             \
 713                                                                             \
 714   diagnostic(bool, TraceNMethodInstalls, false,                             \
 715              "Trace nmethod intallation")                                   \
 716                                                                             \
 717   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 718              "Trace OSR Breakpoint ")                                       \
 719                                                                             \
 720   diagnostic(bool, TraceCompileTriggered, false,                            \
 721              "Trace compile triggered")                                     \
 722                                                                             \
 723   diagnostic(bool, TraceTriggers, false,                                    \
 724              "Trace triggers")                                              \
 725                                                                             \
 726   product(bool, AlwaysRestoreFPU, false,                                    \
 727           "Restore the FPU control word after every JNI call (expensive)")  \
 728                                                                             \
 729   notproduct(bool, PrintCompilation2, false,                                \
 730           "Print additional statistics per compilation")                    \
 731                                                                             \
 732   diagnostic(bool, PrintAdapterHandlers, false,                             \
 733           "Print code generated for i2c/c2i adapters")                      \
 734                                                                             \
 735   diagnostic(bool, PrintAssembly, false,                                    \
 736           "Print assembly code (using external disassembler.so)")           \
 737                                                                             \
 738   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 739           "Options string passed to disassembler.so")                       \
 740                                                                             \
 741   diagnostic(bool, PrintNMethods, false,                                    \
 742           "Print assembly code for nmethods when generated")                \
 743                                                                             \
 744   diagnostic(bool, PrintNativeNMethods, false,                              \
 745           "Print assembly code for native nmethods when generated")         \
 746                                                                             \
 747   develop(bool, PrintDebugInfo, false,                                      \
 748           "Print debug information for all nmethods when generated")        \
 749                                                                             \
 750   develop(bool, PrintRelocations, false,                                    \
 751           "Print relocation information for all nmethods when generated")   \
 752                                                                             \
 753   develop(bool, PrintDependencies, false,                                   \
 754           "Print dependency information for all nmethods when generated")   \
 755                                                                             \
 756   develop(bool, PrintExceptionHandlers, false,                              \
 757           "Print exception handler tables for all nmethods when generated") \
 758                                                                             \
 759   develop(bool, InterceptOSException, false,                                \
 760           "Starts debugger when an implicit OS (e.g., NULL) "               \
 761           "exception happens")                                              \
 762                                                                             \
 763   notproduct(bool, PrintCodeCache, false,                                   \
 764           "Print the compiled_code cache when exiting")                     \
 765                                                                             \
 766   develop(bool, PrintCodeCache2, false,                                     \
 767           "Print detailed info on the compiled_code cache when exiting")    \
 768                                                                             \
 769   diagnostic(bool, PrintStubCode, false,                                    \
 770           "Print generated stub code")                                      \
 771                                                                             \
 772   product(bool, StackTraceInThrowable, true,                                \
 773           "Collect backtrace in throwable when exception happens")          \
 774                                                                             \
 775   product(bool, OmitStackTraceInFastThrow, true,                            \
 776           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 777                                                                             \
 778   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 779           "Prints byte code statictics when dumping profiler output")       \
 780                                                                             \
 781   product(bool, ProfilerRecordPC, false,                                    \
 782           "Collects tick for each 16 byte interval of compiled code")       \
 783                                                                             \
 784   product(bool, ProfileVM,  false,                                          \
 785           "Profiles ticks that fall within VM (either in the VM Thread "    \
 786           "or VM code called through stubs)")                               \
 787                                                                             \
 788   product(bool, ProfileIntervals, false,                                    \
 789           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 790                                                                             \
 791   notproduct(bool, ProfilerCheckIntervals, false,                           \
 792           "Collect and print info on spacing of profiler ticks")            \
 793                                                                             \
 794   develop(bool, PrintJVMWarnings, false,                                    \
 795           "Prints warnings for unimplemented JVM functions")                \
 796                                                                             \
 797   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 798           "Prints warnings for stalled SpinLocks")                          \
 799                                                                             \
 800   develop(bool, InitializeJavaLangSystem, true,                             \
 801           "Initialize java.lang.System - turn off for individual "          \
 802           "method debugging")                                               \
 803                                                                             \
 804   develop(bool, InitializeJavaLangString, true,                             \
 805           "Initialize java.lang.String - turn off for individual "          \
 806           "method debugging")                                               \
 807                                                                             \
 808   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 809           "Initialize various error and exception classes - turn off for "  \
 810           "individual method debugging")                                    \
 811                                                                             \
 812   product(bool, RegisterFinalizersAtInit, true,                             \
 813           "Register finalizable objects at end of Object.<init> or "        \
 814           "after allocation.")                                              \
 815                                                                             \
 816   develop(bool, RegisterReferences, true,                                   \
 817           "Tells whether the VM should register soft/weak/final/phantom "   \
 818           "references")                                                     \
 819                                                                             \
 820   develop(bool, IgnoreRewrites, false,                                      \
 821           "Supress rewrites of bytecodes in the oopmap generator. "         \
 822           "This is unsafe!")                                                \
 823                                                                             \
 824   develop(bool, PrintCodeCacheExtension, false,                             \
 825           "Print extension of code cache")                                  \
 826                                                                             \
 827   develop(bool, UsePrivilegedStack, true,                                   \
 828           "Enable the security JVM functions")                              \
 829                                                                             \
 830   develop(bool, IEEEPrecision, true,                                        \
 831           "Enables IEEE precision (for INTEL only)")                        \
 832                                                                             \
 833   develop(bool, ProtectionDomainVerification, true,                         \
 834           "Verifies protection domain before resolution in system "         \
 835           "dictionary")                                                     \
 836                                                                             \
 837   product(bool, ClassUnloading, true,                                       \
 838           "Do unloading of classes")                                        \
 839                                                                             \
 840   diagnostic(bool, LinkWellKnownClasses, false,                             \
 841           "Resolve a well known class as soon as its name is seen")         \
 842                                                                             \
 843   develop(bool, DisableStartThread, false,                                  \
 844           "Disable starting of additional Java threads "                    \
 845           "(for debugging only)")                                           \
 846                                                                             \
 847   develop(bool, MemProfiling, false,                                        \
 848           "Write memory usage profiling to log file")                       \
 849                                                                             \
 850   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 851           "Prints the system dictionary at exit")                           \
 852                                                                             \
 853   diagnostic(bool, UnsyncloadClass, false,                                  \
 854           "Unstable: VM calls loadClass unsynchronized. Custom "            \
 855           "class loader  must call VM synchronized for findClass "          \
 856           "and defineClass.")                                               \
 857                                                                             \
 858   product(bool, AlwaysLockClassLoader, false,                               \
 859           "Require the VM to acquire the class loader lock before calling " \
 860           "loadClass() even for class loaders registering "                 \
 861           "as parallel capable. Default false. ")                           \
 862                                                                             \
 863   product(bool, AllowParallelDefineClass, false,                            \
 864           "Allow parallel defineClass requests for class loaders "          \
 865           "registering as parallel capable. Default false")                 \
 866                                                                             \
 867   product(bool, MustCallLoadClassInternal, false,                           \
 868           "Call loadClassInternal() rather than loadClass().Default false") \
 869                                                                             \
 870   product_pd(bool, DontYieldALot,                                           \
 871           "Throw away obvious excess yield calls (for SOLARIS only)")       \
 872                                                                             \
 873   product_pd(bool, ConvertSleepToYield,                                     \
 874           "Converts sleep(0) to thread yield "                              \
 875           "(may be off for SOLARIS to improve GUI)")                        \
 876                                                                             \
 877   product(bool, ConvertYieldToSleep, false,                                 \
 878           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
 879           "behavior (SOLARIS only)")                                        \
 880                                                                             \
 881   product(bool, UseBoundThreads, true,                                      \
 882           "Bind user level threads to kernel threads (for SOLARIS only)")   \
 883                                                                             \
 884   develop(bool, UseDetachedThreads, true,                                   \
 885           "Use detached threads that are recycled upon termination "        \
 886           "(for SOLARIS only)")                                             \
 887                                                                             \
 888   product(bool, UseLWPSynchronization, true,                                \
 889           "Use LWP-based instead of libthread-based synchronization "       \
 890           "(SPARC only)")                                                   \
 891                                                                             \
 892   product(ccstr, SyncKnobs, NULL,                                           \
 893           "(Unstable) Various monitor synchronization tunables")            \
 894                                                                             \
 895   product(intx, EmitSync, 0,                                                \
 896           "(Unsafe,Unstable) "                                              \
 897           " Controls emission of inline sync fast-path code")               \
 898                                                                             \
 899   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
 900                                                                             \
 901   product(intx, Atomics, 0,                                                 \
 902           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
 903                                                                             \
 904   product(intx, FenceInstruction, 0,                                        \
 905           "(Unsafe,Unstable) Experimental")                                 \
 906                                                                             \
 907   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
 908                                                                             \
 909   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
 910                                                                             \
 911   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
 912                                                                             \
 913   product(intx, hashCode, 0,                                                \
 914          "(Unstable) select hashCode generation algorithm" )                \
 915                                                                             \
 916   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
 917          "(Unstable, Linux-specific)"                                       \
 918          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
 919                                                                             \
 920   product(bool, FilterSpuriousWakeups , true,                               \
 921           "Prevent spurious or premature wakeups from object.wait"              \
 922           "(Solaris only)")                                                     \
 923                                                                             \
 924   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
 925   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
 926   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
 927                                                                             \
 928   develop(bool, UsePthreads, false,                                         \
 929           "Use pthread-based instead of libthread-based synchronization "   \
 930           "(SPARC only)")                                                   \
 931                                                                             \
 932   product(bool, AdjustConcurrency, false,                                   \
 933           "call thr_setconcurrency at thread create time to avoid "         \
 934           "LWP starvation on MP systems (For Solaris Only)")                \
 935                                                                             \
 936   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
 937           "Should the system attempt to update the compiler file when "     \
 938           "an error occurs?")                                               \
 939                                                                             \
 940   product(bool, ReduceSignalUsage, false,                                   \
 941           "Reduce the use of OS signals in Java and/or the VM")             \
 942                                                                             \
 943   notproduct(bool, ValidateMarkSweep, false,                                \
 944           "Do extra validation during MarkSweep collection")                \
 945                                                                             \
 946   notproduct(bool, RecordMarkSweepCompaction, false,                        \
 947           "Enable GC-to-GC recording and querying of compaction during "    \
 948           "MarkSweep")                                                      \
 949                                                                             \
 950   develop_pd(bool, ShareVtableStubs,                                        \
 951           "Share vtable stubs (smaller code but worse branch prediction")   \
 952                                                                             \
 953   develop(bool, LoadLineNumberTables, true,                                 \
 954           "Tells whether the class file parser loads line number tables")   \
 955                                                                             \
 956   develop(bool, LoadLocalVariableTables, true,                              \
 957           "Tells whether the class file parser loads local variable tables")\
 958                                                                             \
 959   develop(bool, LoadLocalVariableTypeTables, true,                          \
 960           "Tells whether the class file parser loads local variable type tables")\
 961                                                                             \
 962   product(bool, AllowUserSignalHandlers, false,                             \
 963           "Do not complain if the application installs signal handlers "    \
 964           "(Solaris & Linux only)")                                         \
 965                                                                             \
 966   product(bool, UseSignalChaining, true,                                    \
 967           "Use signal-chaining to invoke signal handlers installed "        \
 968           "by the application (Solaris & Linux only)")                      \
 969                                                                             \
 970   product(bool, UseAltSigs, false,                                          \
 971           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
 972           "internal signals. (Solaris only)")                               \
 973                                                                             \
 974   product(bool, UseSpinning, false,                                         \
 975           "Use spinning in monitor inflation and before entry")             \
 976                                                                             \
 977   product(bool, PreSpinYield, false,                                        \
 978           "Yield before inner spinning loop")                               \
 979                                                                             \
 980   product(bool, PostSpinYield, true,                                        \
 981           "Yield after inner spinning loop")                                \
 982                                                                             \
 983   product(bool, AllowJNIEnvProxy, false,                                    \
 984           "Allow JNIEnv proxies for jdbx")                                  \
 985                                                                             \
 986   product(bool, JNIDetachReleasesMonitors, true,                            \
 987           "JNI DetachCurrentThread releases monitors owned by thread")      \
 988                                                                             \
 989   product(bool, RestoreMXCSROnJNICalls, false,                              \
 990           "Restore MXCSR when returning from JNI calls")                    \
 991                                                                             \
 992   product(bool, CheckJNICalls, false,                                       \
 993           "Verify all arguments to JNI calls")                              \
 994                                                                             \
 995   product(bool, UseFastJNIAccessors, true,                                  \
 996           "Use optimized versions of Get<Primitive>Field")                  \
 997                                                                             \
 998   product(bool, EagerXrunInit, false,                                       \
 999           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1000           " but not all -Xrun libraries may support the state of the VM at this time") \
1001                                                                             \
1002   product(bool, PreserveAllAnnotations, false,                              \
1003           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1004                                                                             \
1005   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1006           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1007                                                                             \
1008   product(bool, LazyBootClassLoader, true,                                  \
1009           "Enable/disable lazy opening of boot class path entries")         \
1010                                                                             \
1011   diagnostic(bool, UseIncDec, true,                                         \
1012           "Use INC, DEC instructions on x86")                               \
1013                                                                             \
1014   product(bool, UseNewLongLShift, false,                                    \
1015           "Use optimized bitwise shift left")                               \
1016                                                                             \
1017   product(bool, UseStoreImmI16, true,                                       \
1018           "Use store immediate 16-bits value instruction on x86")           \
1019                                                                             \
1020   product(bool, UseAddressNop, false,                                       \
1021           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
1022                                                                             \
1023   product(bool, UseXmmLoadAndClearUpper, true,                              \
1024           "Load low part of XMM register and clear upper part")             \
1025                                                                             \
1026   product(bool, UseXmmRegToRegMoveAll, false,                               \
1027           "Copy all XMM register bits when moving value between registers") \
1028                                                                             \
1029   product(bool, UseXmmI2D, false,                                           \
1030           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1031                                                                             \
1032   product(bool, UseXmmI2F, false,                                           \
1033           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1034                                                                             \
1035   product(bool, UseXMMForArrayCopy, false,                                  \
1036           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1037                                                                             \
1038   product(bool, UseUnalignedLoadStores, false,                              \
1039           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1040                                                                             \
1041   product(intx, FieldsAllocationStyle, 1,                                   \
1042           "0 - type based with oops first, 1 - with oops last")             \
1043                                                                             \
1044   product(bool, CompactFields, true,                                        \
1045           "Allocate nonstatic fields in gaps between previous fields")      \
1046                                                                             \
1047   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1048           "Print how many words were saved with CompactFields")             \
1049                                                                             \
1050   product(bool, UseBiasedLocking, true,                                     \
1051           "Enable biased locking in JVM")                                   \
1052                                                                             \
1053   product(intx, BiasedLockingStartupDelay, 4000,                            \
1054           "Number of milliseconds to wait before enabling biased locking")  \
1055                                                                             \
1056   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1057           "Print statistics of biased locking in JVM")                      \
1058                                                                             \
1059   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1060           "Threshold of number of revocations per type to try to "          \
1061           "rebias all objects in the heap of that type")                    \
1062                                                                             \
1063   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1064           "Threshold of number of revocations per type to permanently "     \
1065           "revoke biases of all objects in the heap of that type")          \
1066                                                                             \
1067   product(intx, BiasedLockingDecayTime, 25000,                              \
1068           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1069           "type after previous bulk rebias")                                \
1070                                                                             \
1071   /* tracing */                                                             \
1072                                                                             \
1073   notproduct(bool, TraceRuntimeCalls, false,                                \
1074           "Trace run-time calls")                                           \
1075                                                                             \
1076   develop(bool, TraceJNICalls, false,                                       \
1077           "Trace JNI calls")                                                \
1078                                                                             \
1079   notproduct(bool, TraceJVMCalls, false,                                    \
1080           "Trace JVM calls")                                                \
1081                                                                             \
1082   product(ccstr, TraceJVMTI, NULL,                                          \
1083           "Trace flags for JVMTI functions and events")                     \
1084                                                                             \
1085   /* This option can change an EMCP method into an obsolete method. */      \
1086   /* This can affect tests that except specific methods to be EMCP. */      \
1087   /* This option should be used with caution. */                            \
1088   product(bool, StressLdcRewrite, false,                                    \
1089           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1090                                                                             \
1091   product(intx, TraceRedefineClasses, 0,                                    \
1092           "Trace level for JVMTI RedefineClasses")                          \
1093                                                                             \
1094   /* change to false by default sometime after Mustang */                   \
1095   product(bool, VerifyMergedCPBytecodes, true,                              \
1096           "Verify bytecodes after RedefineClasses constant pool merging")   \
1097                                                                             \
1098   develop(bool, TraceJNIHandleAllocation, false,                            \
1099           "Trace allocation/deallocation of JNI handle blocks")             \
1100                                                                             \
1101   develop(bool, TraceThreadEvents, false,                                   \
1102           "Trace all thread events")                                        \
1103                                                                             \
1104   develop(bool, TraceBytecodes, false,                                      \
1105           "Trace bytecode execution")                                       \
1106                                                                             \
1107   develop(bool, TraceClassInitialization, false,                            \
1108           "Trace class initialization")                                     \
1109                                                                             \
1110   develop(bool, TraceExceptions, false,                                     \
1111           "Trace exceptions")                                               \
1112                                                                             \
1113   develop(bool, TraceICs, false,                                            \
1114           "Trace inline cache changes")                                     \
1115                                                                             \
1116   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1117           "Trace method invocation counter overflow")                       \
1118                                                                             \
1119   develop(bool, TraceInlineCacheClearing, false,                            \
1120           "Trace clearing of inline caches in nmethods")                    \
1121                                                                             \
1122   develop(bool, TraceDependencies, false,                                   \
1123           "Trace dependencies")                                             \
1124                                                                             \
1125   develop(bool, VerifyDependencies, trueInDebug,                            \
1126          "Exercise and verify the compilation dependency mechanism")        \
1127                                                                             \
1128   develop(bool, TraceNewOopMapGeneration, false,                            \
1129           "Trace OopMapGeneration")                                         \
1130                                                                             \
1131   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1132           "Trace OopMapGeneration: print detailed cell states")             \
1133                                                                             \
1134   develop(bool, TimeOopMap, false,                                          \
1135           "Time calls to GenerateOopMap::compute_map() in sum")             \
1136                                                                             \
1137   develop(bool, TimeOopMap2, false,                                         \
1138           "Time calls to GenerateOopMap::compute_map() individually")       \
1139                                                                             \
1140   develop(bool, TraceMonitorMismatch, false,                                \
1141           "Trace monitor matching failures during OopMapGeneration")        \
1142                                                                             \
1143   develop(bool, TraceOopMapRewrites, false,                                 \
1144           "Trace rewritting of method oops during oop map generation")      \
1145                                                                             \
1146   develop(bool, TraceSafepoint, false,                                      \
1147           "Trace safepoint operations")                                     \
1148                                                                             \
1149   develop(bool, TraceICBuffer, false,                                       \
1150           "Trace usage of IC buffer")                                       \
1151                                                                             \
1152   develop(bool, TraceCompiledIC, false,                                     \
1153           "Trace changes of compiled IC")                                   \
1154                                                                             \
1155   notproduct(bool, TraceZapDeadLocals, false,                               \
1156           "Trace zapping dead locals")                                      \
1157                                                                             \
1158   develop(bool, TraceStartupTime, false,                                    \
1159           "Trace setup time")                                               \
1160                                                                             \
1161   develop(bool, TraceHPI, false,                                            \
1162           "Trace Host Porting Interface (HPI)")                             \
1163                                                                             \
1164   product(ccstr, HPILibPath, NULL,                                          \
1165           "Specify alternate path to HPI library")                          \
1166                                                                             \
1167   develop(bool, TraceProtectionDomainVerification, false,                   \
1168           "Trace protection domain verifcation")                            \
1169                                                                             \
1170   develop(bool, TraceClearedExceptions, false,                              \
1171           "Prints when an exception is forcibly cleared")                   \
1172                                                                             \
1173   product(bool, TraceClassResolution, false,                                \
1174           "Trace all constant pool resolutions (for debugging)")            \
1175                                                                             \
1176   product(bool, TraceBiasedLocking, false,                                  \
1177           "Trace biased locking in JVM")                                    \
1178                                                                             \
1179   product(bool, TraceMonitorInflation, false,                               \
1180           "Trace monitor inflation in JVM")                                 \
1181                                                                             \
1182   /* assembler */                                                           \
1183   product(bool, Use486InstrsOnly, false,                                    \
1184           "Use 80486 Compliant instruction subset")                         \
1185                                                                             \
1186   /* gc */                                                                  \
1187                                                                             \
1188   product(bool, UseSerialGC, false,                                         \
1189           "Use the serial garbage collector")                               \
1190                                                                             \
1191   experimental(bool, UseG1GC, false,                                        \
1192           "Use the Garbage-First garbage collector")                        \
1193                                                                             \
1194   product(bool, UseParallelGC, false,                                       \
1195           "Use the Parallel Scavenge garbage collector")                    \
1196                                                                             \
1197   product(bool, UseParallelOldGC, false,                                    \
1198           "Use the Parallel Old garbage collector")                         \
1199                                                                             \
1200   product(bool, UseParallelOldGCCompacting, true,                           \
1201           "In the Parallel Old garbage collector use parallel compaction")  \
1202                                                                             \
1203   product(bool, UseParallelDensePrefixUpdate, true,                         \
1204           "In the Parallel Old garbage collector use parallel dense"        \
1205           " prefix update")                                                 \
1206                                                                             \
1207   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1208           "How often should we maximally compact the heap (not allowing "   \
1209           "any dead space)")                                                \
1210                                                                             \
1211   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1212           "The collection count for the first maximum compaction")          \
1213                                                                             \
1214   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1215           "In the Parallel Old garbage collector maximum compaction for "   \
1216           "a system GC")                                                    \
1217                                                                             \
1218   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1219           "The mean used by the par compact dead wood"                      \
1220           "limiter (a number between 0-100).")                              \
1221                                                                             \
1222   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1223           "The standard deviation used by the par compact dead wood"        \
1224           "limiter (a number between 0-100).")                              \
1225                                                                             \
1226   product(bool, UseParallelOldGCDensePrefix, true,                          \
1227           "Use a dense prefix with the Parallel Old garbage collector")     \
1228                                                                             \
1229   product(uintx, ParallelGCThreads, 0,                                      \
1230           "Number of parallel threads parallel gc will use")                \
1231                                                                             \
1232   product(uintx, ParallelCMSThreads, 0,                                     \
1233           "Max number of threads CMS will use for concurrent work")         \
1234                                                                             \
1235   develop(bool, ParallelOldGCSplitALot, false,                              \
1236           "Provoke splitting (copying data from a young gen space to"       \
1237           "multiple destination spaces)")                                   \
1238                                                                             \
1239   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1240           "How often to provoke splitting a young gen space")               \
1241                                                                             \
1242   develop(bool, TraceRegionTasksQueuing, false,                             \
1243           "Trace the queuing of the region tasks")                          \
1244                                                                             \
1245   product(uintx, ParallelMarkingThreads, 0,                                 \
1246           "Number of marking threads concurrent gc will use")               \
1247                                                                             \
1248   product(uintx, YoungPLABSize, 4096,                                       \
1249           "Size of young gen promotion labs (in HeapWords)")                \
1250                                                                             \
1251   product(uintx, OldPLABSize, 1024,                                         \
1252           "Size of old gen promotion labs (in HeapWords)")                  \
1253                                                                             \
1254   product(uintx, GCTaskTimeStampEntries, 200,                               \
1255           "Number of time stamp entries per gc worker thread")              \
1256                                                                             \
1257   product(bool, AlwaysTenure, false,                                        \
1258           "Always tenure objects in eden. (ParallelGC only)")               \
1259                                                                             \
1260   product(bool, NeverTenure, false,                                         \
1261           "Never tenure objects in eden, May tenure on overflow"            \
1262           " (ParallelGC only)")                                             \
1263                                                                             \
1264   product(bool, ScavengeBeforeFullGC, true,                                 \
1265           "Scavenge youngest generation before each full GC,"               \
1266           " used with UseParallelGC")                                       \
1267                                                                             \
1268   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1269           "Allow scavenges to occur when to_space contains objects.")       \
1270                                                                             \
1271   product(bool, UseConcMarkSweepGC, false,                                  \
1272           "Use Concurrent Mark-Sweep GC in the old generation")             \
1273                                                                             \
1274   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1275           "A System.gc() request invokes a concurrent collection;"          \
1276           " (effective only when UseConcMarkSweepGC)")                      \
1277                                                                             \
1278   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1279           "A System.gc() request invokes a concurrent collection and"       \
1280           " also unloads classes during such a concurrent gc cycle  "       \
1281           " (effective only when UseConcMarkSweepGC)")                      \
1282                                                                             \
1283   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1284           "Use Adaptive Free Lists in the CMS generation")                  \
1285                                                                             \
1286   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1287           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1288                                                                             \
1289   develop(bool, RotateCMSCollectionTypes, false,                            \
1290           "Rotate the CMS collections among concurrent and STW")            \
1291                                                                             \
1292   product(bool, UseCMSBestFit, true,                                        \
1293           "Use CMS best fit allocation strategy")                           \
1294                                                                             \
1295   product(bool, UseCMSCollectionPassing, true,                              \
1296           "Use passing of collection from background to foreground")        \
1297                                                                             \
1298   product(bool, UseParNewGC, false,                                         \
1299           "Use parallel threads in the new generation.")                    \
1300                                                                             \
1301   product(bool, ParallelGCVerbose, false,                                   \
1302           "Verbose output for parallel GC.")                                \
1303                                                                             \
1304   product(intx, ParallelGCBufferWastePct, 10,                               \
1305           "wasted fraction of parallel allocation buffer.")                 \
1306                                                                             \
1307   product(bool, ParallelGCRetainPLAB, true,                                 \
1308           "Retain parallel allocation buffers across scavenges.")           \
1309                                                                             \
1310   product(intx, TargetPLABWastePct, 10,                                     \
1311           "target wasted space in last buffer as pct of overall allocation")\
1312                                                                             \
1313   product(uintx, PLABWeight, 75,                                            \
1314           "Percentage (0-100) used to weight the current sample when"       \
1315           "computing exponentially decaying average for ResizePLAB.")       \
1316                                                                             \
1317   product(bool, ResizePLAB, true,                                           \
1318           "Dynamically resize (survivor space) promotion labs")             \
1319                                                                             \
1320   product(bool, PrintPLAB, false,                                           \
1321           "Print (survivor space) promotion labs sizing decisions")         \
1322                                                                             \
1323   product(intx, ParGCArrayScanChunk, 50,                                    \
1324           "Scan a subset and push remainder, if array is bigger than this") \
1325                                                                             \
1326   product(bool, ParGCUseLocalOverflow, false,                               \
1327           "Instead of a global overflow list, use local overflow stacks")   \
1328                                                                             \
1329   product(bool, ParGCTrimOverflow, true,                                    \
1330           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1331                                                                             \
1332   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1333           "Whether we should simulate work queue overflow in ParNew")       \
1334                                                                             \
1335   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1336           "An `interval' counter that determines how frequently"            \
1337           " we simulate overflow; a smaller number increases frequency")    \
1338                                                                             \
1339   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1340           "The desired number of objects to claim from the overflow list")  \
1341                                                                             \
1342   product(uintx, CMSParPromoteBlocksToClaim, 50,                            \
1343           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1344           "parallel GC.")                                                   \
1345                                                                             \
1346   product(bool, AlwaysPreTouch, false,                                      \
1347           "It forces all freshly committed pages to be pre-touched.")       \
1348                                                                             \
1349   product(bool, CMSUseOldDefaults, false,                                   \
1350           "A flag temporarily  introduced to allow reverting to some older" \
1351           "default settings; older as of 6.0 ")                             \
1352                                                                             \
1353   product(intx, CMSYoungGenPerWorker, 16*M,                                 \
1354           "The amount of young gen chosen by default per GC worker "        \
1355           "thread available ")                                              \
1356                                                                             \
1357   product(bool, GCOverheadReporting, false,                                 \
1358          "Enables the GC overhead reporting facility")                      \
1359                                                                             \
1360   product(intx, GCOverheadReportingPeriodMS, 100,                           \
1361           "Reporting period for conc GC overhead reporting, in ms ")        \
1362                                                                             \
1363   product(bool, CMSIncrementalMode, false,                                  \
1364           "Whether CMS GC should operate in \"incremental\" mode")          \
1365                                                                             \
1366   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1367           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1368           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1369           "value")                                                          \
1370                                                                             \
1371   product(bool, CMSIncrementalPacing, true,                                 \
1372           "Whether the CMS incremental mode duty cycle should be "          \
1373           "automatically adjusted")                                         \
1374                                                                             \
1375   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1376           "Lower bound on the duty cycle when CMSIncrementalPacing is"      \
1377           "enabled (a percentage, 0-100).")                                 \
1378                                                                             \
1379   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1380           "Percentage (0-100) used to add conservatism when computing the"  \
1381           "duty cycle.")                                                    \
1382                                                                             \
1383   product(uintx, CMSIncrementalOffset, 0,                                   \
1384           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1385           "is shifted to the right within the period between young GCs")    \
1386                                                                             \
1387   product(uintx, CMSExpAvgFactor, 25,                                       \
1388           "Percentage (0-100) used to weight the current sample when"       \
1389           "computing exponential averages for CMS statistics.")             \
1390                                                                             \
1391   product(uintx, CMS_FLSWeight, 50,                                         \
1392           "Percentage (0-100) used to weight the current sample when"       \
1393           "computing exponentially decating averages for CMS FLS statistics.") \
1394                                                                             \
1395   product(uintx, CMS_FLSPadding, 2,                                         \
1396           "The multiple of deviation from mean to use for buffering"        \
1397           "against volatility in free list demand.")                        \
1398                                                                             \
1399   product(uintx, FLSCoalescePolicy, 2,                                      \
1400           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1401                                                                             \
1402   product(uintx, CMS_SweepWeight, 50,                                       \
1403           "Percentage (0-100) used to weight the current sample when"       \
1404           "computing exponentially decaying average for inter-sweep duration.") \
1405                                                                             \
1406   product(uintx, CMS_SweepPadding, 2,                                       \
1407           "The multiple of deviation from mean to use for buffering"        \
1408           "against volatility in inter-sweep duration.")                    \
1409                                                                             \
1410   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1411           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1412           " duration exceeds this threhold in milliseconds")                \
1413                                                                             \
1414   develop(bool, CMSTraceIncrementalMode, false,                             \
1415           "Trace CMS incremental mode")                                     \
1416                                                                             \
1417   develop(bool, CMSTraceIncrementalPacing, false,                           \
1418           "Trace CMS incremental mode pacing computation")                  \
1419                                                                             \
1420   develop(bool, CMSTraceThreadState, false,                                 \
1421           "Trace the CMS thread state (enable the trace_state() method)")   \
1422                                                                             \
1423   product(bool, CMSClassUnloadingEnabled, false,                            \
1424           "Whether class unloading enabled when using CMS GC")              \
1425                                                                             \
1426   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1427           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1428           " for which classes may not be unloaded")                         \
1429                                                                             \
1430   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1431           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1432                                                                             \
1433   product(bool, UseCMSCompactAtFullCollection, true,                        \
1434           "Use mark sweep compact at full collections")                     \
1435                                                                             \
1436   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1437           "Number of CMS full collection done before compaction if > 0")    \
1438                                                                             \
1439   develop(intx, CMSDictionaryChoice, 0,                                     \
1440           "Use BinaryTreeDictionary as default in the CMS generation")      \
1441                                                                             \
1442   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1443           "Replenish and indexed free list with this number of chunks")     \
1444                                                                             \
1445   product(bool, CMSLoopWarn, false,                                         \
1446           "Warn in case of excessive CMS looping")                          \
1447                                                                             \
1448   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1449           "Whether preserved marks should be restored early")               \
1450                                                                             \
1451   product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),           \
1452           "Size of CMS marking stack")                                      \
1453                                                                             \
1454   product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),       \
1455           "Max size of CMS marking stack")                                  \
1456                                                                             \
1457   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1458           "Whether we should simulate frequent marking stack / work queue"  \
1459           " overflow")                                                      \
1460                                                                             \
1461   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1462           "An `interval' counter that determines how frequently"            \
1463           " we simulate overflow; a smaller number increases frequency")    \
1464                                                                             \
1465   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1466           "(Temporary, subject to experimentation)"                         \
1467           "Maximum number of abortable preclean iterations, if > 0")        \
1468                                                                             \
1469   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1470           "(Temporary, subject to experimentation)"                         \
1471           "Maximum time in abortable preclean in ms")                       \
1472                                                                             \
1473   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1474           "(Temporary, subject to experimentation)"                         \
1475           "Nominal minimum work per abortable preclean iteration")          \
1476                                                                             \
1477   product(intx, CMSAbortablePrecleanWaitMillis, 100,                        \
1478           "(Temporary, subject to experimentation)"                         \
1479           " Time that we sleep between iterations when not given"           \
1480           " enough work per iteration")                                     \
1481                                                                             \
1482   product(uintx, CMSRescanMultiple, 32,                                     \
1483           "Size (in cards) of CMS parallel rescan task")                    \
1484                                                                             \
1485   product(uintx, CMSConcMarkMultiple, 32,                                   \
1486           "Size (in cards) of CMS concurrent MT marking task")              \
1487                                                                             \
1488   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1489           "Size of CMS KlassKlass revisit stack")                           \
1490                                                                             \
1491   product(bool, CMSAbortSemantics, false,                                   \
1492           "Whether abort-on-overflow semantics is implemented")             \
1493                                                                             \
1494   product(bool, CMSParallelRemarkEnabled, true,                             \
1495           "Whether parallel remark enabled (only if ParNewGC)")             \
1496                                                                             \
1497   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1498           "Whether parallel remark of survivor space"                       \
1499           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1500                                                                             \
1501   product(bool, CMSPLABRecordAlways, true,                                  \
1502           "Whether to always record survivor space PLAB bdries"             \
1503           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1504                                                                             \
1505   product(bool, CMSConcurrentMTEnabled, true,                               \
1506           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1507                                                                             \
1508   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1509           "Whether concurrent precleaning enabled in perm gen"              \
1510           " (effective only when CMSPrecleaningEnabled is true)")           \
1511                                                                             \
1512   product(bool, CMSPrecleaningEnabled, true,                                \
1513           "Whether concurrent precleaning enabled")                         \
1514                                                                             \
1515   product(uintx, CMSPrecleanIter, 3,                                        \
1516           "Maximum number of precleaning iteration passes")                 \
1517                                                                             \
1518   product(uintx, CMSPrecleanNumerator, 2,                                   \
1519           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1520           " ratio")                                                         \
1521                                                                             \
1522   product(uintx, CMSPrecleanDenominator, 3,                                 \
1523           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1524           " ratio")                                                         \
1525                                                                             \
1526   product(bool, CMSPrecleanRefLists1, true,                                 \
1527           "Preclean ref lists during (initial) preclean phase")             \
1528                                                                             \
1529   product(bool, CMSPrecleanRefLists2, false,                                \
1530           "Preclean ref lists during abortable preclean phase")             \
1531                                                                             \
1532   product(bool, CMSPrecleanSurvivors1, false,                               \
1533           "Preclean survivors during (initial) preclean phase")             \
1534                                                                             \
1535   product(bool, CMSPrecleanSurvivors2, true,                                \
1536           "Preclean survivors during abortable preclean phase")             \
1537                                                                             \
1538   product(uintx, CMSPrecleanThreshold, 1000,                                \
1539           "Don't re-iterate if #dirty cards less than this")                \
1540                                                                             \
1541   product(bool, CMSCleanOnEnter, true,                                      \
1542           "Clean-on-enter optimization for reducing number of dirty cards") \
1543                                                                             \
1544   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1545           "Choose variant (1,2) of verification following remark")          \
1546                                                                             \
1547   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1548           "If Eden used is below this value, don't try to schedule remark") \
1549                                                                             \
1550   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1551           "The Eden occupancy % at which to try and schedule remark pause") \
1552                                                                             \
1553   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1554           "Start sampling Eden top at least before yg occupancy reaches"    \
1555           " 1/<ratio> of the size at which we plan to schedule remark")     \
1556                                                                             \
1557   product(uintx, CMSSamplingGrain, 16*K,                                    \
1558           "The minimum distance between eden samples for CMS (see above)")  \
1559                                                                             \
1560   product(bool, CMSScavengeBeforeRemark, false,                             \
1561           "Attempt scavenge before the CMS remark step")                    \
1562                                                                             \
1563   develop(bool, CMSTraceSweeper, false,                                     \
1564           "Trace some actions of the CMS sweeper")                          \
1565                                                                             \
1566   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1567           "Don't drain below this size per parallel worker/thief")          \
1568                                                                             \
1569   product(intx, CMSWaitDuration, 2000,                                      \
1570           "Time in milliseconds that CMS thread waits for young GC")        \
1571                                                                             \
1572   product(bool, CMSYield, true,                                             \
1573           "Yield between steps of concurrent mark & sweep")                 \
1574                                                                             \
1575   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1576           "Bitmap operations should process at most this many bits"         \
1577           "between yields")                                                 \
1578                                                                             \
1579   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1580           "Verify that all refs across the FLS boundary "                   \
1581           " are to valid objects")                                          \
1582                                                                             \
1583   diagnostic(bool, FLSVerifyLists, false,                                   \
1584           "Do lots of (expensive) FreeListSpace verification")              \
1585                                                                             \
1586   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1587           "Do lots of (expensive) FLS index table verification")            \
1588                                                                             \
1589   develop(bool, FLSVerifyDictionary, false,                                 \
1590           "Do lots of (expensive) FLS dictionary verification")             \
1591                                                                             \
1592   develop(bool, VerifyBlockOffsetArray, false,                              \
1593           "Do (expensive!) block offset array verification")                \
1594                                                                             \
1595   product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug,           \
1596           "Maintain _unallocated_block in BlockOffsetArray"                 \
1597           " (currently applicable only to CMS collector)")                  \
1598                                                                             \
1599   develop(bool, TraceCMSState, false,                                       \
1600           "Trace the state of the CMS collection")                          \
1601                                                                             \
1602   product(intx, RefDiscoveryPolicy, 0,                                      \
1603           "Whether reference-based(0) or referent-based(1)")                \
1604                                                                             \
1605   product(bool, ParallelRefProcEnabled, false,                              \
1606           "Enable parallel reference processing whenever possible")         \
1607                                                                             \
1608   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1609           "Enable balancing of reference processing queues")                \
1610                                                                             \
1611   product(intx, CMSTriggerRatio, 80,                                        \
1612           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1613           "  allocated before a CMS collection cycle commences")            \
1614                                                                             \
1615   product(intx, CMSTriggerPermRatio, 80,                                    \
1616           "Percentage of MinHeapFreeRatio in the CMS perm generation that"  \
1617           "  is allocated before a CMS collection cycle commences, that  "  \
1618           "  also collects the perm generation")                            \
1619                                                                             \
1620   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1621           "Percentage CMS generation occupancy at which to "                \
1622           " initiate CMS collection for bootstrapping collection stats")    \
1623                                                                             \
1624   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1625           "Percentage CMS generation occupancy to start a CMS collection "  \
1626           " cycle (A negative value means that CMSTriggerRatio is used)")   \
1627                                                                             \
1628   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1629           "Percentage CMS perm generation occupancy to start a CMScollection"\
1630           " cycle (A negative value means that CMSTriggerPermRatio is used)")\
1631                                                                             \
1632   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1633           "Only use occupancy as a crierion for starting a CMS collection") \
1634                                                                             \
1635   product(intx, CMSIsTooFullPercentage, 98,                                 \
1636           "An absolute ceiling above which CMS will always consider the"    \
1637           " perm gen ripe for collection")                                  \
1638                                                                             \
1639   develop(bool, CMSTestInFreeList, false,                                   \
1640           "Check if the coalesced range is already in the "                 \
1641           "free lists as claimed.")                                         \
1642                                                                             \
1643   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1644           "Check that all the garbage collected was returned to the "       \
1645           "free lists.")                                                    \
1646                                                                             \
1647   notproduct(bool, ScavengeALot, false,                                     \
1648           "Force scavenge at every Nth exit from the runtime system "       \
1649           "(N=ScavengeALotInterval)")                                       \
1650                                                                             \
1651   develop(bool, FullGCALot, false,                                          \
1652           "Force full gc at every Nth exit from the runtime system "        \
1653           "(N=FullGCALotInterval)")                                         \
1654                                                                             \
1655   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1656           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1657                                                                             \
1658   product(bool, HandlePromotionFailure, true,                               \
1659           "The youngest generation collection does not require"             \
1660           " a guarantee of full promotion of all live objects.")            \
1661                                                                             \
1662   notproduct(bool, PromotionFailureALot, false,                             \
1663           "Use promotion failure handling on every youngest generation "    \
1664           "collection")                                                     \
1665                                                                             \
1666   develop(uintx, PromotionFailureALotCount, 1000,                           \
1667           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1668           "refill attempts (ParNew) or promotion attempts "                 \
1669           "(other young collectors) ")                                      \
1670                                                                             \
1671   develop(uintx, PromotionFailureALotInterval, 5,                           \
1672           "Total collections between promotion failures alot")              \
1673                                                                             \
1674   develop(intx, WorkStealingSleepMillis, 1,                                 \
1675           "Sleep time when sleep is used for yields")                       \
1676                                                                             \
1677   develop(uintx, WorkStealingYieldsBeforeSleep, 1000,                       \
1678           "Number of yields before a sleep is done during workstealing")    \
1679                                                                             \
1680   develop(uintx, WorkStealingHardSpins, 4096,                               \
1681           "Number of iterations in a spin loop between checks on "          \
1682           "time out of hard spin")                                          \
1683                                                                             \
1684   develop(uintx, WorkStealingSpinToYieldRatio, 10,                          \
1685           "Ratio of hard spins to calls to yield")                          \
1686                                                                             \
1687   product(uintx, PreserveMarkStackSize, 1024,                               \
1688            "Size for stack used in promotion failure handling")             \
1689                                                                             \
1690   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1691                                                                             \
1692   product_pd(bool, ResizeTLAB,                                              \
1693           "Dynamically resize tlab size for threads")                       \
1694                                                                             \
1695   product(bool, ZeroTLAB, false,                                            \
1696           "Zero out the newly created TLAB")                                \
1697                                                                             \
1698   product(bool, FastTLABRefill, true,                                       \
1699           "Use fast TLAB refill code")                                      \
1700                                                                             \
1701   product(bool, PrintTLAB, false,                                           \
1702           "Print various TLAB related information")                         \
1703                                                                             \
1704   product(bool, TLABStats, true,                                            \
1705           "Print various TLAB related information")                         \
1706                                                                             \
1707   product_pd(bool, NeverActAsServerClassMachine,                            \
1708           "Never act like a server-class machine")                          \
1709                                                                             \
1710   product(bool, AlwaysActAsServerClassMachine, false,                       \
1711           "Always act like a server-class machine")                         \
1712                                                                             \
1713   product_pd(uintx, DefaultMaxRAM,                                          \
1714           "Maximum real memory size for setting server class heap size")    \
1715                                                                             \
1716   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1717           "Fraction (1/n) of real memory used for server class max heap")   \
1718                                                                             \
1719   product(uintx, DefaultInitialRAMFraction, 64,                             \
1720           "Fraction (1/n) of real memory used for server class initial heap")  \
1721                                                                             \
1722   product(bool, UseAutoGCSelectPolicy, false,                               \
1723           "Use automatic collection selection policy")                      \
1724                                                                             \
1725   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1726           "Automatic GC selection pause threshhold in ms")                  \
1727                                                                             \
1728   product(bool, UseAdaptiveSizePolicy, true,                                \
1729           "Use adaptive generation sizing policies")                        \
1730                                                                             \
1731   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1732           "Use adaptive survivor sizing policies")                          \
1733                                                                             \
1734   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1735           "Use adaptive young-old sizing policies at minor collections")    \
1736                                                                             \
1737   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1738           "Use adaptive young-old sizing policies at major collections")    \
1739                                                                             \
1740   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1741           "Use statistics from System.GC for adaptive size policy")         \
1742                                                                             \
1743   product(bool, UseAdaptiveGCBoundary, false,                               \
1744           "Allow young-old boundary to move")                               \
1745                                                                             \
1746   develop(bool, TraceAdaptiveGCBoundary, false,                             \
1747           "Trace young-old boundary moves")                                 \
1748                                                                             \
1749   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
1750           "Resize the virtual spaces of the young or old generations")      \
1751                                                                             \
1752   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
1753           "Policy for changeing generation size for throughput goals")      \
1754                                                                             \
1755   product(uintx, AdaptiveSizePausePolicy, 0,                                \
1756           "Policy for changing generation size for pause goals")            \
1757                                                                             \
1758   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
1759           "Adjust tenured generation to achive a minor pause goal")         \
1760                                                                             \
1761   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
1762           "Adjust young generation to achive a major pause goal")           \
1763                                                                             \
1764   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
1765           "Number of steps where heuristics is used before data is used")   \
1766                                                                             \
1767   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
1768           "Number of collections before the adaptive sizing is started")    \
1769                                                                             \
1770   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
1771           "Collecton interval for printing information, zero => never")     \
1772                                                                             \
1773   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
1774           "Use adaptive minimum footprint as a goal")                       \
1775                                                                             \
1776   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
1777           "Weight given to exponential resizing, between 0 and 100")        \
1778                                                                             \
1779   product(uintx, AdaptiveTimeWeight,       25,                              \
1780           "Weight given to time in adaptive policy, between 0 and 100")     \
1781                                                                             \
1782   product(uintx, PausePadding, 1,                                           \
1783           "How much buffer to keep for pause time")                         \
1784                                                                             \
1785   product(uintx, PromotedPadding, 3,                                        \
1786           "How much buffer to keep for promotion failure")                  \
1787                                                                             \
1788   product(uintx, SurvivorPadding, 3,                                        \
1789           "How much buffer to keep for survivor overflow")                  \
1790                                                                             \
1791   product(uintx, AdaptivePermSizeWeight, 20,                                \
1792           "Weight for perm gen exponential resizing, between 0 and 100")    \
1793                                                                             \
1794   product(uintx, PermGenPadding, 3,                                         \
1795           "How much buffer to keep for perm gen sizing")                    \
1796                                                                             \
1797   product(uintx, ThresholdTolerance, 10,                                    \
1798           "Allowed collection cost difference between generations")         \
1799                                                                             \
1800   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
1801           "If collection costs are within margin, reduce both by full delta") \
1802                                                                             \
1803   product(uintx, YoungGenerationSizeIncrement, 20,                          \
1804           "Adaptive size percentage change in young generation")            \
1805                                                                             \
1806   product(uintx, YoungGenerationSizeSupplement, 80,                         \
1807           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
1808                                                                             \
1809   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
1810           "Decay factor to YoungedGenerationSizeSupplement")                \
1811                                                                             \
1812   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
1813           "Adaptive size percentage change in tenured generation")          \
1814                                                                             \
1815   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
1816           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
1817                                                                             \
1818   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
1819           "Decay factor to TenuredGenerationSizeIncrement")                 \
1820                                                                             \
1821   product(uintx, MaxGCPauseMillis, max_uintx,                               \
1822           "Adaptive size policy maximum GC pause time goal in msec")        \
1823                                                                             \
1824   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
1825           "Adaptive size policy maximum GC minor pause time goal in msec")  \
1826                                                                             \
1827   product(uintx, GCTimeRatio, 99,                                           \
1828           "Adaptive size policy application time to GC time ratio")         \
1829                                                                             \
1830   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
1831           "Adaptive size scale down factor for shrinking")                  \
1832                                                                             \
1833   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
1834           "Adaptive size decays the major cost for long major intervals")   \
1835                                                                             \
1836   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
1837           "Time scale over which major costs decay")                        \
1838                                                                             \
1839   product(uintx, MinSurvivorRatio, 3,                                       \
1840           "Minimum ratio of young generation/survivor space size")          \
1841                                                                             \
1842   product(uintx, InitialSurvivorRatio, 8,                                   \
1843           "Initial ratio of eden/survivor space size")                      \
1844                                                                             \
1845   product(uintx, BaseFootPrintEstimate, 256*M,                              \
1846           "Estimate of footprint other than Java Heap")                     \
1847                                                                             \
1848   product(bool, UseGCOverheadLimit, true,                                   \
1849           "Use policy to limit of proportion of time spent in GC "          \
1850           "before an OutOfMemory error is thrown")                          \
1851                                                                             \
1852   product(uintx, GCTimeLimit, 98,                                           \
1853           "Limit of proportion of time spent in GC before an OutOfMemory"   \
1854           "error is thrown (used with GCHeapFreeLimit)")                    \
1855                                                                             \
1856   product(uintx, GCHeapFreeLimit, 2,                                        \
1857           "Minimum percentage of free space after a full GC before an "     \
1858           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
1859                                                                             \
1860   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
1861           "Number of consecutive collections before gc time limit fires")   \
1862                                                                             \
1863   product(bool, PrintAdaptiveSizePolicy, false,                             \
1864           "Print information about AdaptiveSizePolicy")                     \
1865                                                                             \
1866   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
1867           "How far ahead to prefetch destination area (<= 0 means off)")    \
1868                                                                             \
1869   product(intx, PrefetchScanIntervalInBytes, -1,                            \
1870           "How far ahead to prefetch scan area (<= 0 means off)")           \
1871                                                                             \
1872   product(intx, PrefetchFieldsAhead, -1,                                    \
1873           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1874                                                                             \
1875   develop(bool, UsePrefetchQueue, true,                                     \
1876           "Use the prefetch queue during PS promotion")                     \
1877                                                                             \
1878   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
1879           "Verify system before exiting")                                   \
1880                                                                             \
1881   diagnostic(bool, VerifyBeforeGC, false,                                   \
1882           "Verify memory system before GC")                                 \
1883                                                                             \
1884   diagnostic(bool, VerifyAfterGC, false,                                    \
1885           "Verify memory system after GC")                                  \
1886                                                                             \
1887   diagnostic(bool, VerifyDuringGC, false,                                   \
1888           "Verify memory system during GC (between phases)")                \
1889                                                                             \
1890   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
1891           "Enable parallel memory system verification")                     \
1892                                                                             \
1893   diagnostic(bool, VerifyRememberedSets, false,                             \
1894           "Verify GC remembered sets")                                      \
1895                                                                             \
1896   diagnostic(bool, VerifyObjectStartArray, true,                            \
1897           "Verify GC object start array if verify before/after")            \
1898                                                                             \
1899   product(bool, DisableExplicitGC, false,                                   \
1900           "Tells whether calling System.gc() does a full GC")               \
1901                                                                             \
1902   notproduct(bool, CheckMemoryInitialization, false,                        \
1903           "Checks memory initialization")                                   \
1904                                                                             \
1905   product(bool, CollectGen0First, false,                                    \
1906           "Collect youngest generation before each full GC")                \
1907                                                                             \
1908   diagnostic(bool, BindCMSThreadToCPU, false,                               \
1909           "Bind CMS Thread to CPU if possible")                             \
1910                                                                             \
1911   diagnostic(uintx, CPUForCMSThread, 0,                                     \
1912           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1913                                                                             \
1914   product(bool, BindGCTaskThreadsToCPUs, false,                             \
1915           "Bind GCTaskThreads to CPUs if possible")                         \
1916                                                                             \
1917   product(bool, UseGCTaskAffinity, false,                                   \
1918           "Use worker affinity when asking for GCTasks")                    \
1919                                                                             \
1920   product(uintx, ProcessDistributionStride, 4,                              \
1921           "Stride through processors when distributing processes")          \
1922                                                                             \
1923   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
1924           "number of times the coordinator GC thread will sleep while "     \
1925           "yielding before giving up and resuming GC")                      \
1926                                                                             \
1927   product(uintx, CMSYieldSleepCount, 0,                                     \
1928           "number of times a GC thread (minus the coordinator) "            \
1929           "will sleep while yielding before giving up and resuming GC")     \
1930                                                                             \
1931   notproduct(bool, PrintFlagsFinal, false,                                  \
1932           "Print all command line flags after argument processing")         \
1933                                                                             \
1934   /* gc tracing */                                                          \
1935   manageable(bool, PrintGC, false,                                          \
1936           "Print message at garbage collect")                               \
1937                                                                             \
1938   manageable(bool, PrintGCDetails, false,                                   \
1939           "Print more details at garbage collect")                          \
1940                                                                             \
1941   manageable(bool, PrintGCDateStamps, false,                                \
1942           "Print date stamps at garbage collect")                           \
1943                                                                             \
1944   manageable(bool, PrintGCTimeStamps, false,                                \
1945           "Print timestamps at garbage collect")                            \
1946                                                                             \
1947   product(bool, PrintGCTaskTimeStamps, false,                               \
1948           "Print timestamps for individual gc worker thread tasks")         \
1949                                                                             \
1950   develop(intx, ConcGCYieldTimeout, 0,                                      \
1951           "If non-zero, assert that GC threads yield within this # of ms.") \
1952                                                                             \
1953   notproduct(bool, TraceMarkSweep, false,                                   \
1954           "Trace mark sweep")                                               \
1955                                                                             \
1956   product(bool, PrintReferenceGC, false,                                    \
1957           "Print times spent handling reference objects during GC "         \
1958           " (enabled only when PrintGCDetails)")                            \
1959                                                                             \
1960   develop(bool, TraceReferenceGC, false,                                    \
1961           "Trace handling of soft/weak/final/phantom references")           \
1962                                                                             \
1963   develop(bool, TraceFinalizerRegistration, false,                          \
1964          "Trace registration of final references")                          \
1965                                                                             \
1966   notproduct(bool, TraceScavenge, false,                                    \
1967           "Trace scavenge")                                                 \
1968                                                                             \
1969   product_rw(bool, TraceClassLoading, false,                                \
1970           "Trace all classes loaded")                                       \
1971                                                                             \
1972   product(bool, TraceClassLoadingPreorder, false,                           \
1973           "Trace all classes loaded in order referenced (not loaded)")      \
1974                                                                             \
1975   product_rw(bool, TraceClassUnloading, false,                              \
1976           "Trace unloading of classes")                                     \
1977                                                                             \
1978   product_rw(bool, TraceLoaderConstraints, false,                           \
1979           "Trace loader constraints")                                       \
1980                                                                             \
1981   product(bool, TraceGen0Time, false,                                       \
1982           "Trace accumulated time for Gen 0 collection")                    \
1983                                                                             \
1984   product(bool, TraceGen1Time, false,                                       \
1985           "Trace accumulated time for Gen 1 collection")                    \
1986                                                                             \
1987   product(bool, PrintTenuringDistribution, false,                           \
1988           "Print tenuring age information")                                 \
1989                                                                             \
1990   product_rw(bool, PrintHeapAtGC, false,                                    \
1991           "Print heap layout before and after each GC")                     \
1992                                                                             \
1993   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1994           "Print heap layout in response to SIGBREAK")                      \
1995                                                                             \
1996   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
1997           "Print a class histogram before any major stop-world GC")         \
1998                                                                             \
1999   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2000           "Print a class histogram after any major stop-world GC")          \
2001                                                                             \
2002   manageable(bool, PrintClassHistogram, false,                              \
2003           "Print a histogram of class instances")                           \
2004                                                                             \
2005   develop(bool, TraceWorkGang, false,                                       \
2006           "Trace activities of work gangs")                                 \
2007                                                                             \
2008   product(bool, TraceParallelOldGCTasks, false,                             \
2009           "Trace multithreaded GC activity")                                \
2010                                                                             \
2011   develop(bool, TraceBlockOffsetTable, false,                               \
2012           "Print BlockOffsetTable maps")                                    \
2013                                                                             \
2014   develop(bool, TraceCardTableModRefBS, false,                              \
2015           "Print CardTableModRefBS maps")                                   \
2016                                                                             \
2017   develop(bool, TraceGCTaskManager, false,                                  \
2018           "Trace actions of the GC task manager")                           \
2019                                                                             \
2020   develop(bool, TraceGCTaskQueue, false,                                    \
2021           "Trace actions of the GC task queues")                            \
2022                                                                             \
2023   develop(bool, TraceGCTaskThread, false,                                   \
2024           "Trace actions of the GC task threads")                           \
2025                                                                             \
2026   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2027           "Print the time taken by each parallel old gc phase."             \
2028           "PrintGCDetails must also be enabled.")                           \
2029                                                                             \
2030   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2031           "Trace parallel old gc marking phase")                            \
2032                                                                             \
2033   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2034           "Trace parallel old gc summary phase")                            \
2035                                                                             \
2036   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2037           "Trace parallel old gc compaction phase")                         \
2038                                                                             \
2039   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2040           "Trace parallel old gc dense prefix computation")                 \
2041                                                                             \
2042   develop(bool, IgnoreLibthreadGPFault, false,                              \
2043           "Suppress workaround for libthread GP fault")                     \
2044                                                                             \
2045   product(bool, PrintJNIGCStalls, false,                                    \
2046           "Print diagnostic message when GC is stalled"                     \
2047           "by JNI critical section")                                        \
2048                                                                             \
2049   /* JVMTI heap profiling */                                                \
2050                                                                             \
2051   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2052           "Trace JVMTI object tagging calls")                               \
2053                                                                             \
2054   diagnostic(bool, VerifyBeforeIteration, false,                            \
2055           "Verify memory system before JVMTI iteration")                    \
2056                                                                             \
2057   /* compiler interface */                                                  \
2058                                                                             \
2059   develop(bool, CIPrintCompilerName, false,                                 \
2060           "when CIPrint is active, print the name of the active compiler")  \
2061                                                                             \
2062   develop(bool, CIPrintCompileQueue, false,                                 \
2063           "display the contents of the compile queue whenever a "           \
2064           "compilation is enqueued")                                        \
2065                                                                             \
2066   develop(bool, CIPrintRequests, false,                                     \
2067           "display every request for compilation")                          \
2068                                                                             \
2069   product(bool, CITime, false,                                              \
2070           "collect timing information for compilation")                     \
2071                                                                             \
2072   develop(bool, CITimeEach, false,                                          \
2073           "display timing information after each successful compilation")   \
2074                                                                             \
2075   develop(bool, CICountOSR, true,                                           \
2076           "use a separate counter when assigning ids to osr compilations")  \
2077                                                                             \
2078   develop(bool, CICompileNatives, true,                                     \
2079           "compile native methods if supported by the compiler")            \
2080                                                                             \
2081   develop_pd(bool, CICompileOSR,                                            \
2082           "compile on stack replacement methods if supported by the "       \
2083           "compiler")                                                       \
2084                                                                             \
2085   develop(bool, CIPrintMethodCodes, false,                                  \
2086           "print method bytecodes of the compiled code")                    \
2087                                                                             \
2088   develop(bool, CIPrintTypeFlow, false,                                     \
2089           "print the results of ciTypeFlow analysis")                       \
2090                                                                             \
2091   develop(bool, CITraceTypeFlow, false,                                     \
2092           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2093                                                                             \
2094   develop(intx, CICloneLoopTestLimit, 100,                                  \
2095           "size limit for blocks heuristically cloned in ciTypeFlow")       \
2096                                                                             \
2097   /* temp diagnostics */                                                    \
2098                                                                             \
2099   diagnostic(bool, TraceRedundantCompiles, false,                           \
2100           "Have compile broker print when a request already in the queue is"\
2101           " requested again")                                               \
2102                                                                             \
2103   diagnostic(bool, InitialCompileFast, false,                               \
2104           "Initial compile at CompLevel_fast_compile")                      \
2105                                                                             \
2106   diagnostic(bool, InitialCompileReallyFast, false,                         \
2107           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2108                                                                             \
2109   diagnostic(bool, FullProfileOnReInterpret, true,                          \
2110           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2111                                                                             \
2112   /* compiler */                                                            \
2113                                                                             \
2114   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2115           "Number of compiler threads to run")                              \
2116                                                                             \
2117   product(intx, CompilationPolicyChoice, 0,                                 \
2118           "which compilation policy (0/1)")                                 \
2119                                                                             \
2120   develop(bool, UseStackBanging, true,                                      \
2121           "use stack banging for stack overflow checks (required for "      \
2122           "proper StackOverflow handling; disable only to measure cost "    \
2123           "of stackbanging)")                                               \
2124                                                                             \
2125   develop(bool, Use24BitFPMode, true,                                       \
2126           "Set 24-bit FPU mode on a per-compile basis ")                    \
2127                                                                             \
2128   develop(bool, Use24BitFP, true,                                           \
2129           "use FP instructions that produce 24-bit precise results")        \
2130                                                                             \
2131   develop(bool, UseStrictFP, true,                                          \
2132           "use strict fp if modifier strictfp is set")                      \
2133                                                                             \
2134   develop(bool, GenerateSynchronizationCode, true,                          \
2135           "generate locking/unlocking code for synchronized methods and "   \
2136           "monitors")                                                       \
2137                                                                             \
2138   develop(bool, GenerateCompilerNullChecks, true,                           \
2139           "Generate explicit null checks for loads/stores/calls")           \
2140                                                                             \
2141   develop(bool, GenerateRangeChecks, true,                                  \
2142           "Generate range checks for array accesses")                       \
2143                                                                             \
2144   develop_pd(bool, ImplicitNullChecks,                                      \
2145           "generate code for implicit null checks")                         \
2146                                                                             \
2147   product(bool, PrintSafepointStatistics, false,                            \
2148           "print statistics about safepoint synchronization")               \
2149                                                                             \
2150   product(intx, PrintSafepointStatisticsCount, 300,                         \
2151           "total number of safepoint statistics collected "                 \
2152           "before printing them out")                                       \
2153                                                                             \
2154   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2155           "print safepoint statistics only when safepoint takes"            \
2156           " more than PrintSafepointSatisticsTimeout in millis")            \
2157                                                                             \
2158   develop(bool, InlineAccessors, true,                                      \
2159           "inline accessor methods (get/set)")                              \
2160                                                                             \
2161   product(bool, Inline, true,                                               \
2162           "enable inlining")                                                \
2163                                                                             \
2164   product(bool, ClipInlining, true,                                         \
2165           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2166                                                                             \
2167   develop(bool, UseCHA, true,                                               \
2168           "enable CHA")                                                     \
2169                                                                             \
2170   product(bool, UseTypeProfile, true,                                       \
2171           "Check interpreter profile for historically monomorphic calls")   \
2172                                                                             \
2173   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2174           "% of major receiver type to all profiled receivers")             \
2175                                                                             \
2176   notproduct(bool, TimeCompiler, false,                                     \
2177           "time the compiler")                                              \
2178                                                                             \
2179   notproduct(bool, TimeCompiler2, false,                                    \
2180           "detailed time the compiler (requires +TimeCompiler)")            \
2181                                                                             \
2182   diagnostic(bool, PrintInlining, false,                                    \
2183           "prints inlining optimizations")                                  \
2184                                                                             \
2185   diagnostic(bool, PrintIntrinsics, false,                                  \
2186           "prints attempted and successful inlining of intrinsics")         \
2187                                                                             \
2188   product(bool, UseCountLeadingZerosInstruction, false,                     \
2189           "Use count leading zeros instruction")                            \
2190                                                                             \
2191   product(bool, UsePopCountInstruction, false,                              \
2192           "Use population count instruction")                               \
2193                                                                             \
2194   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2195           "do not expand intrinsics whose (internal) names appear here")    \
2196                                                                             \
2197   develop(bool, StressReflectiveCode, false,                                \
2198           "Use inexact types at allocations, etc., to test reflection")     \
2199                                                                             \
2200   develop(bool, EagerInitialization, false,                                 \
2201           "Eagerly initialize classes if possible")                         \
2202                                                                             \
2203   product(bool, Tier1UpdateMethodData, trueInTiered,                        \
2204           "Update methodDataOops in Tier1-generated code")                  \
2205                                                                             \
2206   develop(bool, TraceMethodReplacement, false,                              \
2207           "Print when methods are replaced do to recompilation")            \
2208                                                                             \
2209   develop(bool, PrintMethodFlushing, false,                                 \
2210           "print the nmethods being flushed")                               \
2211                                                                             \
2212   notproduct(bool, LogMultipleMutexLocking, false,                          \
2213           "log locking and unlocking of mutexes (only if multiple locks "   \
2214           "are held)")                                                      \
2215                                                                             \
2216   develop(bool, UseRelocIndex, false,                                       \
2217          "use an index to speed random access to relocations")              \
2218                                                                             \
2219   develop(bool, StressCodeBuffers, false,                                   \
2220          "Exercise code buffer expansion and other rare state changes")     \
2221                                                                             \
2222   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2223          "Generate extra debugging info for non-safepoints in nmethods")    \
2224                                                                             \
2225   diagnostic(bool, DebugInlinedCalls, true,                                 \
2226          "If false, restricts profiled locations to the root method only")  \
2227                                                                             \
2228   product(bool, PrintVMOptions, trueInDebug,                                \
2229          "print VM flag settings")                                          \
2230                                                                             \
2231   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2232          "Ignore unrecognized VM options")                                  \
2233                                                                             \
2234   diagnostic(bool, SerializeVMOutput, true,                                 \
2235          "Use a mutex to serialize output to tty and hotspot.log")          \
2236                                                                             \
2237   diagnostic(bool, DisplayVMOutput, true,                                   \
2238          "Display all VM output on the tty, independently of LogVMOutput")  \
2239                                                                             \
2240   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2241          "Save VM output to hotspot.log, or to LogFile")                    \
2242                                                                             \
2243   diagnostic(ccstr, LogFile, NULL,                                          \
2244          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2245                                                                             \
2246   product(ccstr, ErrorFile, NULL,                                           \
2247          "If an error occurs, save the error data to this file "            \
2248          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2249                                                                             \
2250   product(bool, DisplayVMOutputToStderr, false,                             \
2251          "If DisplayVMOutput is true, display all VM output to stderr")     \
2252                                                                             \
2253   product(bool, DisplayVMOutputToStdout, false,                             \
2254          "If DisplayVMOutput is true, display all VM output to stdout")     \
2255                                                                             \
2256   product(bool, UseHeavyMonitors, false,                                    \
2257           "use heavyweight instead of lightweight Java monitors")           \
2258                                                                             \
2259   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2260           "print histogram of the symbol table")                            \
2261                                                                             \
2262   notproduct(bool, ExitVMOnVerifyError, false,                              \
2263           "standard exit from VM if bytecode verify error "                 \
2264           "(only in debug mode)")                                           \
2265                                                                             \
2266   notproduct(ccstr, AbortVMOnException, NULL,                               \
2267           "Call fatal if this exception is thrown.  Example: "              \
2268           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2269                                                                             \
2270   develop(bool, DebugVtables, false,                                        \
2271           "add debugging code to vtable dispatch")                          \
2272                                                                             \
2273   develop(bool, PrintVtables, false,                                        \
2274           "print vtables when printing klass")                              \
2275                                                                             \
2276   notproduct(bool, PrintVtableStats, false,                                 \
2277           "print vtables stats at end of run")                              \
2278                                                                             \
2279   develop(bool, TraceCreateZombies, false,                                  \
2280           "trace creation of zombie nmethods")                              \
2281                                                                             \
2282   notproduct(bool, IgnoreLockingAssertions, false,                          \
2283           "disable locking assertions (for speed)")                         \
2284                                                                             \
2285   notproduct(bool, VerifyLoopOptimizations, false,                          \
2286           "verify major loop optimizations")                                \
2287                                                                             \
2288   product(bool, RangeCheckElimination, true,                                \
2289           "Split loop iterations to eliminate range checks")                \
2290                                                                             \
2291   develop_pd(bool, UncommonNullCast,                                        \
2292           "track occurrences of null in casts; adjust compiler tactics")    \
2293                                                                             \
2294   develop(bool, TypeProfileCasts,  true,                                    \
2295           "treat casts like calls for purposes of type profiling")          \
2296                                                                             \
2297   develop(bool, MonomorphicArrayCheck, true,                                \
2298           "Uncommon-trap array store checks that require full type check")  \
2299                                                                             \
2300   develop(bool, DelayCompilationDuringStartup, true,                        \
2301           "Delay invoking the compiler until main application class is "    \
2302           "loaded")                                                         \
2303                                                                             \
2304   develop(bool, CompileTheWorld, false,                                     \
2305           "Compile all methods in all classes in bootstrap class path "     \
2306           "(stress test)")                                                  \
2307                                                                             \
2308   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2309           "Preload all classes used by a class before start loading")       \
2310                                                                             \
2311   notproduct(bool, CompileTheWorldIgnoreInitErrors, false,                  \
2312           "Compile all methods although class initializer failed")          \
2313                                                                             \
2314   develop(bool, TraceIterativeGVN, false,                                   \
2315           "Print progress during Iterative Global Value Numbering")         \
2316                                                                             \
2317   develop(bool, FillDelaySlots, true,                                       \
2318           "Fill delay slots (on SPARC only)")                               \
2319                                                                             \
2320   develop(bool, VerifyIterativeGVN, false,                                  \
2321           "Verify Def-Use modifications during sparse Iterative Global "    \
2322           "Value Numbering")                                                \
2323                                                                             \
2324   notproduct(bool, TracePhaseCCP, false,                                    \
2325           "Print progress during Conditional Constant Propagation")         \
2326                                                                             \
2327   develop(bool, TimeLivenessAnalysis, false,                                \
2328           "Time computation of bytecode liveness analysis")                 \
2329                                                                             \
2330   develop(bool, TraceLivenessGen, false,                                    \
2331           "Trace the generation of liveness analysis information")          \
2332                                                                             \
2333   notproduct(bool, TraceLivenessQuery, false,                               \
2334           "Trace queries of liveness analysis information")                 \
2335                                                                             \
2336   notproduct(bool, CollectIndexSetStatistics, false,                        \
2337           "Collect information about IndexSets")                            \
2338                                                                             \
2339   develop(bool, PrintDominators, false,                                     \
2340           "Print out dominator trees for GVN")                              \
2341                                                                             \
2342   develop(bool, UseLoopSafepoints, true,                                    \
2343           "Generate Safepoint nodes in every loop")                         \
2344                                                                             \
2345   notproduct(bool, TraceCISCSpill, false,                                   \
2346           "Trace allocators use of cisc spillable instructions")            \
2347                                                                             \
2348   notproduct(bool, TraceSpilling, false,                                    \
2349           "Trace spilling")                                                 \
2350                                                                             \
2351   develop(bool, DeutschShiffmanExceptions, true,                            \
2352           "Fast check to find exception handler for precisely typed "       \
2353           "exceptions")                                                     \
2354                                                                             \
2355   product(bool, SplitIfBlocks, true,                                        \
2356           "Clone compares and control flow through merge points to fold "   \
2357           "some branches")                                                  \
2358                                                                             \
2359   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2360           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2361           "Inline allocations larger than this in doublewords must go slow")\
2362                                                                             \
2363   product(bool, AggressiveOpts, false,                                      \
2364           "Enable aggressive optimizations - see arguments.cpp")            \
2365                                                                             \
2366   product(bool, UseStringCache, false,                                      \
2367           "Enable String cache capabilities on String.java")                \
2368                                                                             \
2369   /* statistics */                                                          \
2370   develop(bool, UseVTune, false,                                            \
2371           "enable support for Intel's VTune profiler")                      \
2372                                                                             \
2373   develop(bool, CountCompiledCalls, false,                                  \
2374           "counts method invocations")                                      \
2375                                                                             \
2376   notproduct(bool, CountRuntimeCalls, false,                                \
2377           "counts VM runtime calls")                                        \
2378                                                                             \
2379   develop(bool, CountJNICalls, false,                                       \
2380           "counts jni method invocations")                                  \
2381                                                                             \
2382   notproduct(bool, CountJVMCalls, false,                                    \
2383           "counts jvm method invocations")                                  \
2384                                                                             \
2385   notproduct(bool, CountRemovableExceptions, false,                         \
2386           "count exceptions that could be replaced by branches due to "     \
2387           "inlining")                                                       \
2388                                                                             \
2389   notproduct(bool, ICMissHistogram, false,                                  \
2390           "produce histogram of IC misses")                                 \
2391                                                                             \
2392   notproduct(bool, PrintClassStatistics, false,                             \
2393           "prints class statistics at end of run")                          \
2394                                                                             \
2395   notproduct(bool, PrintMethodStatistics, false,                            \
2396           "prints method statistics at end of run")                         \
2397                                                                             \
2398   /* interpreter */                                                         \
2399   develop(bool, ClearInterpreterLocals, false,                              \
2400           "Always clear local variables of interpreter activations upon "   \
2401           "entry")                                                          \
2402                                                                             \
2403   product_pd(bool, RewriteBytecodes,                                        \
2404           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2405                                                                             \
2406   product_pd(bool, RewriteFrequentPairs,                                    \
2407           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2408                                                                             \
2409   diagnostic(bool, PrintInterpreter, false,                                 \
2410           "Prints the generated interpreter code")                          \
2411                                                                             \
2412   product(bool, UseInterpreter, true,                                       \
2413           "Use interpreter for non-compiled methods")                       \
2414                                                                             \
2415   develop(bool, UseFastSignatureHandlers, true,                             \
2416           "Use fast signature handlers for native calls")                   \
2417                                                                             \
2418   develop(bool, UseV8InstrsOnly, false,                                     \
2419           "Use SPARC-V8 Compliant instruction subset")                      \
2420                                                                             \
2421   product(bool, UseNiagaraInstrs, false,                                    \
2422           "Use Niagara-efficient instruction subset")                       \
2423                                                                             \
2424   develop(bool, UseCASForSwap, false,                                       \
2425           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2426                                                                             \
2427   product(bool, UseLoopCounter, true,                                       \
2428           "Increment invocation counter on backward branch")                \
2429                                                                             \
2430   product(bool, UseFastEmptyMethods, true,                                  \
2431           "Use fast method entry code for empty methods")                   \
2432                                                                             \
2433   product(bool, UseFastAccessorMethods, true,                               \
2434           "Use fast method entry code for accessor methods")                \
2435                                                                             \
2436   product_pd(bool, UseOnStackReplacement,                                   \
2437            "Use on stack replacement, calls runtime if invoc. counter "     \
2438            "overflows in loop")                                             \
2439                                                                             \
2440   notproduct(bool, TraceOnStackReplacement, false,                          \
2441           "Trace on stack replacement")                                     \
2442                                                                             \
2443   develop(bool, PoisonOSREntry, true,                                       \
2444            "Detect abnormal calls to OSR code")                             \
2445                                                                             \
2446   product_pd(bool, PreferInterpreterNativeStubs,                            \
2447           "Use always interpreter stubs for native methods invoked via "    \
2448           "interpreter")                                                    \
2449                                                                             \
2450   develop(bool, CountBytecodes, false,                                      \
2451           "Count number of bytecodes executed")                             \
2452                                                                             \
2453   develop(bool, PrintBytecodeHistogram, false,                              \
2454           "Print histogram of the executed bytecodes")                      \
2455                                                                             \
2456   develop(bool, PrintBytecodePairHistogram, false,                          \
2457           "Print histogram of the executed bytecode pairs")                 \
2458                                                                             \
2459   diagnostic(bool, PrintSignatureHandlers, false,                           \
2460           "Print code generated for native method signature handlers")      \
2461                                                                             \
2462   develop(bool, VerifyOops, false,                                          \
2463           "Do plausibility checks for oops")                                \
2464                                                                             \
2465   develop(bool, CheckUnhandledOops, false,                                  \
2466           "Check for unhandled oops in VM code")                            \
2467                                                                             \
2468   develop(bool, VerifyJNIFields, trueInDebug,                               \
2469           "Verify jfieldIDs for instance fields")                           \
2470                                                                             \
2471   notproduct(bool, VerifyJNIEnvThread, false,                               \
2472           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2473           "from JNI")                                                       \
2474                                                                             \
2475   develop(bool, VerifyFPU, false,                                           \
2476           "Verify FPU state (check for NaN's, etc.)")                       \
2477                                                                             \
2478   develop(bool, VerifyThread, false,                                        \
2479           "Watch the thread register for corruption (SPARC only)")          \
2480                                                                             \
2481   develop(bool, VerifyActivationFrameSize, false,                           \
2482           "Verify that activation frame didn't become smaller than its "    \
2483           "minimal size")                                                   \
2484                                                                             \
2485   develop(bool, TraceFrequencyInlining, false,                              \
2486           "Trace frequency based inlining")                                 \
2487                                                                             \
2488   notproduct(bool, TraceTypeProfile, false,                                 \
2489           "Trace type profile")                                             \
2490                                                                             \
2491   develop_pd(bool, InlineIntrinsics,                                        \
2492            "Inline intrinsics that can be statically resolved")             \
2493                                                                             \
2494   product_pd(bool, ProfileInterpreter,                                      \
2495            "Profile at the bytecode level during interpretation")           \
2496                                                                             \
2497   develop_pd(bool, ProfileTraps,                                            \
2498           "Profile deoptimization traps at the bytecode level")             \
2499                                                                             \
2500   product(intx, ProfileMaturityPercentage, 20,                              \
2501           "number of method invocations/branches (expressed as % of "       \
2502           "CompileThreshold) before using the method's profile")            \
2503                                                                             \
2504   develop(bool, PrintMethodData, false,                                     \
2505            "Print the results of +ProfileInterpreter at end of run")        \
2506                                                                             \
2507   develop(bool, VerifyDataPointer, trueInDebug,                             \
2508           "Verify the method data pointer during interpreter profiling")    \
2509                                                                             \
2510   develop(bool, VerifyCompiledCode, false,                                  \
2511           "Include miscellaneous runtime verifications in nmethod code; "   \
2512           "off by default because it disturbs nmethod size heuristics.")    \
2513                                                                             \
2514                                                                             \
2515   /* compilation */                                                         \
2516   product(bool, UseCompiler, true,                                          \
2517           "use compilation")                                                \
2518                                                                             \
2519   develop(bool, TraceCompilationPolicy, false,                              \
2520           "Trace compilation policy")                                       \
2521                                                                             \
2522   develop(bool, TimeCompilationPolicy, false,                               \
2523           "Time the compilation policy")                                    \
2524                                                                             \
2525   product(bool, UseCounterDecay, true,                                      \
2526            "adjust recompilation counters")                                 \
2527                                                                             \
2528   develop(intx, CounterHalfLifeTime,    30,                                 \
2529           "half-life time of invocation counters (in secs)")                \
2530                                                                             \
2531   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2532           "Min. ms. between invocation of CounterDecay")                    \
2533                                                                             \
2534   product(bool, AlwaysCompileLoopMethods, false,                            \
2535           "when using recompilation, never interpret methods "              \
2536           "containing loops")                                               \
2537                                                                             \
2538   product(bool, DontCompileHugeMethods, true,                               \
2539           "don't compile methods > HugeMethodLimit")                        \
2540                                                                             \
2541   /* Bytecode escape analysis estimation. */                                \
2542   product(bool, EstimateArgEscape, true,                                    \
2543           "Analyze bytecodes to estimate escape state of arguments")        \
2544                                                                             \
2545   product(intx, BCEATraceLevel, 0,                                          \
2546           "How much tracing to do of bytecode escape analysis estimates")   \
2547                                                                             \
2548   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2549           "Maximum number of nested calls that are analyzed by BC EA.")     \
2550                                                                             \
2551   product(intx, MaxBCEAEstimateSize, 150,                                   \
2552           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2553                                                                             \
2554   product(intx,  AllocatePrefetchStyle, 1,                                  \
2555           "0 = no prefetch, "                                               \
2556           "1 = prefetch instructions for each allocation, "                 \
2557           "2 = use TLAB watermark to gate allocation prefetch")             \
2558                                                                             \
2559   product(intx,  AllocatePrefetchDistance, -1,                              \
2560           "Distance to prefetch ahead of allocation pointer")               \
2561                                                                             \
2562   product(intx,  AllocatePrefetchLines, 1,                                  \
2563           "Number of lines to prefetch ahead of allocation pointer")        \
2564                                                                             \
2565   product(intx,  AllocatePrefetchStepSize, 16,                              \
2566           "Step size in bytes of sequential prefetch instructions")         \
2567                                                                             \
2568   product(intx,  AllocatePrefetchInstr, 0,                                  \
2569           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2570                                                                             \
2571   product(intx,  ReadPrefetchInstr, 0,                                      \
2572           "Prefetch instruction to prefetch ahead")                         \
2573                                                                             \
2574   /* deoptimization */                                                      \
2575   develop(bool, TraceDeoptimization, false,                                 \
2576           "Trace deoptimization")                                           \
2577                                                                             \
2578   develop(bool, DebugDeoptimization, false,                                 \
2579           "Tracing various information while debugging deoptimization")     \
2580                                                                             \
2581   product(intx, SelfDestructTimer, 0,                                       \
2582           "Will cause VM to terminate after a given time (in minutes) "     \
2583           "(0 means off)")                                                  \
2584                                                                             \
2585   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2586           "Max. no. of lines in the stack trace for Java exceptions "       \
2587           "(0 means all)")                                                  \
2588                                                                             \
2589   develop(intx, GuaranteedSafepointInterval, 1000,                          \
2590           "Guarantee a safepoint (at least) every so many milliseconds "    \
2591           "(0 means none)")                                                 \
2592                                                                             \
2593   product(intx, SafepointTimeoutDelay, 10000,                               \
2594           "Delay in milliseconds for option SafepointTimeout")              \
2595                                                                             \
2596   product(intx, NmethodSweepFraction, 4,                                    \
2597           "Number of invocations of sweeper to cover all nmethods")         \
2598                                                                             \
2599   notproduct(intx, MemProfilingInterval, 500,                               \
2600           "Time between each invocation of the MemProfiler")                \
2601                                                                             \
2602   develop(intx, MallocCatchPtr, -1,                                         \
2603           "Hit breakpoint when mallocing/freeing this pointer")             \
2604                                                                             \
2605   notproduct(intx, AssertRepeat, 1,                                         \
2606           "number of times to evaluate expression in assert "               \
2607           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2608                                                                             \
2609   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2610           "List of assertions (file:line) to muzzle")                       \
2611                                                                             \
2612   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2613           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2614           "is used")                                                        \
2615                                                                             \
2616   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2617           "Threshold for total handle allocation when "                     \
2618           "+TraceHandleAllocation is used")                                 \
2619                                                                             \
2620   develop(intx, StackPrintLimit, 100,                                       \
2621           "number of stack frames to print in VM-level stack dump")         \
2622                                                                             \
2623   notproduct(intx, MaxElementPrintSize, 256,                                \
2624           "maximum number of elements to print")                            \
2625                                                                             \
2626   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2627           "maximum number of subklasses to print when printing klass")      \
2628                                                                             \
2629   develop(intx, MaxInlineLevel, 9,                                          \
2630           "maximum number of nested calls that are inlined")                \
2631                                                                             \
2632   develop(intx, MaxRecursiveInlineLevel, 1,                                 \
2633           "maximum number of nested recursive calls that are inlined")      \
2634                                                                             \
2635   product_pd(intx, InlineSmallCode,                                         \
2636           "Only inline already compiled methods if their code size is "     \
2637           "less than this")                                                 \
2638                                                                             \
2639   product(intx, MaxInlineSize, 35,                                          \
2640           "maximum bytecode size of a method to be inlined")                \
2641                                                                             \
2642   product_pd(intx, FreqInlineSize,                                          \
2643           "maximum bytecode size of a frequent method to be inlined")       \
2644                                                                             \
2645   develop(intx, MaxTrivialSize, 6,                                          \
2646           "maximum bytecode size of a trivial method to be inlined")        \
2647                                                                             \
2648   develop(intx, MinInliningThreshold, 250,                                  \
2649           "min. invocation count a method needs to have to be inlined")     \
2650                                                                             \
2651   develop(intx, AlignEntryCode, 4,                                          \
2652           "aligns entry code to specified value (in bytes)")                \
2653                                                                             \
2654   develop(intx, MethodHistogramCutoff, 100,                                 \
2655           "cutoff value for method invoc. histogram (+CountCalls)")         \
2656                                                                             \
2657   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2658           "# of interpreted methods to show in profile")                    \
2659                                                                             \
2660   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2661           "# of compiled methods to show in profile")                       \
2662                                                                             \
2663   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2664           "# of stub methods to show in profile")                           \
2665                                                                             \
2666   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2667           "# of runtime stub nodes to show in profile")                     \
2668                                                                             \
2669   product(intx, ProfileIntervalsTicks, 100,                                 \
2670           "# of ticks between printing of interval profile "                \
2671           "(+ProfileIntervals)")                                            \
2672                                                                             \
2673   notproduct(intx, ScavengeALotInterval,     1,                             \
2674           "Interval between which scavenge will occur with +ScavengeALot")  \
2675                                                                             \
2676   notproduct(intx, FullGCALotInterval,     1,                               \
2677           "Interval between which full gc will occur with +FullGCALot")     \
2678                                                                             \
2679   notproduct(intx, FullGCALotStart,     0,                                  \
2680           "For which invocation to start FullGCAlot")                       \
2681                                                                             \
2682   notproduct(intx, FullGCALotDummies,  32*K,                                \
2683           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2684           "to move")                                                        \
2685                                                                             \
2686   develop(intx, DontYieldALotInterval,    10,                               \
2687           "Interval between which yields will be dropped (milliseconds)")   \
2688                                                                             \
2689   develop(intx, MinSleepInterval,     1,                                    \
2690           "Minimum sleep() interval (milliseconds) when "                   \
2691           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2692                                                                             \
2693   product(intx, EventLogLength,  2000,                                      \
2694           "maximum nof events in event log")                                \
2695                                                                             \
2696   develop(intx, ProfilerPCTickThreshold,    15,                             \
2697           "Number of ticks in a PC buckets to be a hotspot")                \
2698                                                                             \
2699   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2700           "Number of exits until DeoptimizeALot kicks in")                  \
2701                                                                             \
2702   notproduct(intx, ZombieALotInterval,     5,                               \
2703           "Number of exits until ZombieALot kicks in")                      \
2704                                                                             \
2705   develop(bool, StressNonEntrant, false,                                    \
2706           "Mark nmethods non-entrant at registration")                      \
2707                                                                             \
2708   diagnostic(intx, MallocVerifyInterval,     0,                             \
2709           "if non-zero, verify C heap after every N calls to "              \
2710           "malloc/realloc/free")                                            \
2711                                                                             \
2712   diagnostic(intx, MallocVerifyStart,     0,                                \
2713           "if non-zero, start verifying C heap after Nth call to "          \
2714           "malloc/realloc/free")                                            \
2715                                                                             \
2716   product(intx, TypeProfileWidth,      2,                                   \
2717           "number of receiver types to record in call/cast profile")        \
2718                                                                             \
2719   develop(intx, BciProfileWidth,      2,                                    \
2720           "number of return bci's to record in ret profile")                \
2721                                                                             \
2722   product(intx, PerMethodRecompilationCutoff, 400,                          \
2723           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2724                                                                             \
2725   product(intx, PerBytecodeRecompilationCutoff, 100,                        \
2726           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2727                                                                             \
2728   product(intx, PerMethodTrapLimit,  100,                                   \
2729           "Limit on traps (of one kind) in a method (includes inlines)")    \
2730                                                                             \
2731   product(intx, PerBytecodeTrapLimit,  4,                                   \
2732           "Limit on traps (of one kind) at a particular BCI")               \
2733                                                                             \
2734   develop(intx, FreqCountInvocations,  1,                                   \
2735           "Scaling factor for branch frequencies (deprecated)")             \
2736                                                                             \
2737   develop(intx, InlineFrequencyRatio,    20,                                \
2738           "Ratio of call site execution to caller method invocation")       \
2739                                                                             \
2740   develop_pd(intx, InlineFrequencyCount,                                    \
2741           "Count of call site execution necessary to trigger frequent "     \
2742           "inlining")                                                       \
2743                                                                             \
2744   develop(intx, InlineThrowCount,    50,                                    \
2745           "Force inlining of interpreted methods that throw this often")    \
2746                                                                             \
2747   develop(intx, InlineThrowMaxSize,   200,                                  \
2748           "Force inlining of throwing methods smaller than this")           \
2749                                                                             \
2750   product(intx, AliasLevel,     3,                                          \
2751           "0 for no aliasing, 1 for oop/field/static/array split, "         \
2752           "2 for class split, 3 for unique instances")                      \
2753                                                                             \
2754   develop(bool, VerifyAliases, false,                                       \
2755           "perform extra checks on the results of alias analysis")          \
2756                                                                             \
2757   develop(intx, ProfilerNodeSize,  1024,                                    \
2758           "Size in K to allocate for the Profile Nodes of each thread")     \
2759                                                                             \
2760   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
2761           "Number of times to spin wait on a v8 atomic operation lock")     \
2762                                                                             \
2763   product(intx, ReadSpinIterations,   100,                                  \
2764           "Number of read attempts before a yield (spin inner loop)")       \
2765                                                                             \
2766   product_pd(intx, PreInflateSpin,                                          \
2767           "Number of times to spin wait before inflation")                  \
2768                                                                             \
2769   product(intx, PreBlockSpin,    10,                                        \
2770           "Number of times to spin in an inflated lock before going to "    \
2771           "an OS lock")                                                     \
2772                                                                             \
2773   /* gc parameters */                                                       \
2774   product(uintx, MaxHeapSize, ScaleForWordSize(64*M),                       \
2775           "Default maximum size for object heap (in bytes)")                \
2776                                                                             \
2777   product_pd(uintx, NewSize,                                                \
2778           "Default size of new generation (in bytes)")                      \
2779                                                                             \
2780   product(uintx, MaxNewSize, max_uintx,                                     \
2781           "Maximum size of new generation (in bytes)")                      \
2782                                                                             \
2783   product(uintx, PretenureSizeThreshold, 0,                                 \
2784           "Max size in bytes of objects allocated in DefNew generation")    \
2785                                                                             \
2786   product_pd(uintx, TLABSize,                                               \
2787           "Default (or starting) size of TLAB (in bytes)")                  \
2788                                                                             \
2789   product(uintx, MinTLABSize, 2*K,                                          \
2790           "Minimum allowed TLAB size (in bytes)")                           \
2791                                                                             \
2792   product(uintx, TLABAllocationWeight, 35,                                  \
2793           "Allocation averaging weight")                                    \
2794                                                                             \
2795   product(uintx, TLABWasteTargetPercent, 1,                                 \
2796           "Percentage of Eden that can be wasted")                          \
2797                                                                             \
2798   product(uintx, TLABRefillWasteFraction,    64,                            \
2799           "Max TLAB waste at a refill (internal fragmentation)")            \
2800                                                                             \
2801   product(uintx, TLABWasteIncrement,    4,                                  \
2802           "Increment allowed waste at slow allocation")                     \
2803                                                                             \
2804   product_pd(intx, SurvivorRatio,                                           \
2805           "Ratio of eden/survivor space size")                              \
2806                                                                             \
2807   product_pd(intx, NewRatio,                                                \
2808           "Ratio of new/old generation sizes")                              \
2809                                                                             \
2810   product(uintx, MaxLiveObjectEvacuationRatio, 100,                         \
2811           "Max percent of eden objects that will be live at scavenge")      \
2812                                                                             \
2813   product_pd(uintx, NewSizeThreadIncrease,                                  \
2814           "Additional size added to desired new generation size per "       \
2815           "non-daemon thread (in bytes)")                                   \
2816                                                                             \
2817   product(uintx, OldSize, ScaleForWordSize(4096*K),                         \
2818           "Default size of tenured generation (in bytes)")                  \
2819                                                                             \
2820   product_pd(uintx, PermSize,                                               \
2821           "Default size of permanent generation (in bytes)")                \
2822                                                                             \
2823   product_pd(uintx, MaxPermSize,                                            \
2824           "Maximum size of permanent generation (in bytes)")                \
2825                                                                             \
2826   product(uintx, MinHeapFreeRatio,    40,                                   \
2827           "Min percentage of heap free after GC to avoid expansion")        \
2828                                                                             \
2829   product(uintx, MaxHeapFreeRatio,    70,                                   \
2830           "Max percentage of heap free after GC to avoid shrinking")        \
2831                                                                             \
2832   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
2833           "Number of milliseconds per MB of free space in the heap")        \
2834                                                                             \
2835   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
2836           "Min change in heap space due to GC (in bytes)")                  \
2837                                                                             \
2838   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
2839           "Min expansion of permanent heap (in bytes)")                     \
2840                                                                             \
2841   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
2842           "Max expansion of permanent heap without full GC (in bytes)")     \
2843                                                                             \
2844   product(intx, QueuedAllocationWarningCount, 0,                            \
2845           "Number of times an allocation that queues behind a GC "          \
2846           "will retry before printing a warning")                           \
2847                                                                             \
2848   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
2849           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
2850                                                                             \
2851   diagnostic(intx, VerifyGCLevel,     0,                                    \
2852           "Generation level at which to start +VerifyBefore/AfterGC")       \
2853                                                                             \
2854   develop(uintx, ExitAfterGCNum,   0,                                       \
2855           "If non-zero, exit after this GC.")                               \
2856                                                                             \
2857   product(intx, MaxTenuringThreshold,    15,                                \
2858           "Maximum value for tenuring threshold")                           \
2859                                                                             \
2860   product(intx, InitialTenuringThreshold,     7,                            \
2861           "Initial value for tenuring threshold")                           \
2862                                                                             \
2863   product(intx, TargetSurvivorRatio,    50,                                 \
2864           "Desired percentage of survivor space used after scavenge")       \
2865                                                                             \
2866   product(uintx, MarkSweepDeadRatio,     5,                                 \
2867           "Percentage (0-100) of the old gen allowed as dead wood."         \
2868           "Serial mark sweep treats this as both the min and max value."    \
2869           "CMS uses this value only if it falls back to mark sweep."        \
2870           "Par compact uses a variable scale based on the density of the"   \
2871           "generation and treats this as the max value when the heap is"    \
2872           "either completely full or completely empty.  Par compact also"   \
2873           "has a smaller default value; see arguments.cpp.")                \
2874                                                                             \
2875   product(uintx, PermMarkSweepDeadRatio,    20,                             \
2876           "Percentage (0-100) of the perm gen allowed as dead wood."        \
2877           "See MarkSweepDeadRatio for collector-specific comments.")        \
2878                                                                             \
2879   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
2880           "How often should we fully compact the heap (ignoring the dead "  \
2881           "space parameters)")                                              \
2882                                                                             \
2883   product(intx, PrintCMSStatistics, 0,                                      \
2884           "Statistics for CMS")                                             \
2885                                                                             \
2886   product(bool, PrintCMSInitiationStatistics, false,                        \
2887           "Statistics for initiating a CMS collection")                     \
2888                                                                             \
2889   product(intx, PrintFLSStatistics, 0,                                      \
2890           "Statistics for CMS' FreeListSpace")                              \
2891                                                                             \
2892   product(intx, PrintFLSCensus, 0,                                          \
2893           "Census for CMS' FreeListSpace")                                  \
2894                                                                             \
2895   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
2896           "Delay in ms between expansion and allocation")                   \
2897                                                                             \
2898   product(intx, DeferThrSuspendLoopCount,     4000,                         \
2899           "(Unstable) Number of times to iterate in safepoint loop "        \
2900           " before blocking VM threads ")                                   \
2901                                                                             \
2902   product(intx, DeferPollingPageLoopCount,     -1,                          \
2903           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
2904           "before changing safepoint polling page to RO ")                  \
2905                                                                             \
2906   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
2907                                                                             \
2908   product(bool, UseDepthFirstScavengeOrder, true,                           \
2909           "true: the scavenge order will be depth-first, "                  \
2910           "false: the scavenge order will be breadth-first")                \
2911                                                                             \
2912   product(bool, PSChunkLargeArrays, true,                                   \
2913           "true: process large arrays in chunks")                           \
2914                                                                             \
2915   product(uintx, GCDrainStackTargetSize, 64,                                \
2916           "how many entries we'll try to leave on the stack during "        \
2917           "parallel GC")                                                    \
2918                                                                             \
2919   product(intx, DCQBarrierQueueBufferSize, 256,                             \
2920           "Number of elements in a dirty card queue buffer")                \
2921                                                                             \
2922   product(intx, DCQBarrierProcessCompletedThreshold, 5,                     \
2923           "Number of completed dirty card buffers to trigger processing.")  \
2924                                                                             \
2925   /* stack parameters */                                                    \
2926   product_pd(intx, StackYellowPages,                                        \
2927           "Number of yellow zone (recoverable overflows) pages")            \
2928                                                                             \
2929   product_pd(intx, StackRedPages,                                           \
2930           "Number of red zone (unrecoverable overflows) pages")             \
2931                                                                             \
2932   product_pd(intx, StackShadowPages,                                        \
2933           "Number of shadow zone (for overflow checking) pages"             \
2934           " this should exceed the depth of the VM and native call stack")  \
2935                                                                             \
2936   product_pd(intx, ThreadStackSize,                                         \
2937           "Thread Stack Size (in Kbytes)")                                  \
2938                                                                             \
2939   product_pd(intx, VMThreadStackSize,                                       \
2940           "Non-Java Thread Stack Size (in Kbytes)")                         \
2941                                                                             \
2942   product_pd(intx, CompilerThreadStackSize,                                 \
2943           "Compiler Thread Stack Size (in Kbytes)")                         \
2944                                                                             \
2945   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
2946           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
2947                                                                             \
2948   product(uintx, ThreadSafetyMargin, 50*M,                                  \
2949           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
2950           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
2951           "disable this feature")                                           \
2952                                                                             \
2953   /* code cache parameters */                                               \
2954   develop(uintx, CodeCacheSegmentSize, 64,                                  \
2955           "Code cache segment size (in bytes) - smallest unit of "          \
2956           "allocation")                                                     \
2957                                                                             \
2958   develop_pd(intx, CodeEntryAlignment,                                      \
2959           "Code entry alignment for generated code (in bytes)")             \
2960                                                                             \
2961   product_pd(uintx, InitialCodeCacheSize,                                   \
2962           "Initial code cache size (in bytes)")                             \
2963                                                                             \
2964   product_pd(uintx, ReservedCodeCacheSize,                                  \
2965           "Reserved code cache size (in bytes) - maximum code cache size")  \
2966                                                                             \
2967   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
2968           "When less than X space left, we stop compiling.")                \
2969                                                                             \
2970   product_pd(uintx, CodeCacheExpansionSize,                                 \
2971           "Code cache expansion size (in bytes)")                           \
2972                                                                             \
2973   develop_pd(uintx, CodeCacheMinBlockLength,                                \
2974           "Minimum number of segments in a code cache block.")              \
2975                                                                             \
2976   notproduct(bool, ExitOnFullCodeCache, false,                              \
2977           "Exit the VM if we fill the code cache.")                         \
2978                                                                             \
2979   /* interpreter debugging */                                               \
2980   develop(intx, BinarySwitchThreshold, 5,                                   \
2981           "Minimal number of lookupswitch entries for rewriting to binary " \
2982           "switch")                                                         \
2983                                                                             \
2984   develop(intx, StopInterpreterAt, 0,                                       \
2985           "Stops interpreter execution at specified bytecode number")       \
2986                                                                             \
2987   develop(intx, TraceBytecodesAt, 0,                                        \
2988           "Traces bytecodes starting with specified bytecode number")       \
2989                                                                             \
2990   /* compiler interface */                                                  \
2991   develop(intx, CIStart, 0,                                                 \
2992           "the id of the first compilation to permit")                      \
2993                                                                             \
2994   develop(intx, CIStop,    -1,                                              \
2995           "the id of the last compilation to permit")                       \
2996                                                                             \
2997   develop(intx, CIStartOSR,     0,                                          \
2998           "the id of the first osr compilation to permit "                  \
2999           "(CICountOSR must be on)")                                        \
3000                                                                             \
3001   develop(intx, CIStopOSR,    -1,                                           \
3002           "the id of the last osr compilation to permit "                   \
3003           "(CICountOSR must be on)")                                        \
3004                                                                             \
3005   develop(intx, CIBreakAtOSR,    -1,                                        \
3006           "id of osr compilation to break at")                              \
3007                                                                             \
3008   develop(intx, CIBreakAt,    -1,                                           \
3009           "id of compilation to break at")                                  \
3010                                                                             \
3011   product(ccstrlist, CompileOnly, "",                                       \
3012           "List of methods (pkg/class.name) to restrict compilation to")    \
3013                                                                             \
3014   product(ccstr, CompileCommandFile, NULL,                                  \
3015           "Read compiler commands from this file [.hotspot_compiler]")      \
3016                                                                             \
3017   product(ccstrlist, CompileCommand, "",                                    \
3018           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3019                                                                             \
3020   product(bool, CICompilerCountPerCPU, false,                               \
3021           "1 compiler thread for log(N CPUs)")                              \
3022                                                                             \
3023   develop(intx, CIFireOOMAt,    -1,                                         \
3024           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3025           "(non-negative value throws OOM after this many CI accesses "     \
3026           "in each compile)")                                               \
3027                                                                             \
3028   develop(intx, CIFireOOMAtDelay, -1,                                       \
3029           "Wait for this many CI accesses to occur in all compiles before " \
3030           "beginning to throw OutOfMemoryErrors in each compile")           \
3031                                                                             \
3032   /* Priorities */                                                          \
3033   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3034                                                                             \
3035   product(intx, ThreadPriorityPolicy, 0,                                    \
3036           "0 : Normal.                                                     "\
3037           "    VM chooses priorities that are appropriate for normal       "\
3038           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3039           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3040           "    map to lower native priority values. On Windows applications"\
3041           "    are allowed to use higher native priorities. However, with  "\
3042           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3043           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3044           "    interfere with system threads. On Linux thread priorities   "\
3045           "    are ignored because the OS does not support static priority "\
3046           "    in SCHED_OTHER scheduling class which is the only choice for"\
3047           "    non-root, non-realtime applications.                        "\
3048           "1 : Aggressive.                                                 "\
3049           "    Java thread priorities map over to the entire range of      "\
3050           "    native thread priorities. Higher Java thread priorities map "\
3051           "    to higher native thread priorities. This policy should be   "\
3052           "    used with care, as sometimes it can cause performance       "\
3053           "    degradation in the application and/or the entire system. On "\
3054           "    Linux this policy requires root privilege.")                 \
3055                                                                             \
3056   product(bool, ThreadPriorityVerbose, false,                               \
3057           "print priority changes")                                         \
3058                                                                             \
3059   product(intx, DefaultThreadPriority, -1,                                  \
3060           "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3061                                                                             \
3062   product(intx, CompilerThreadPriority, -1,                                 \
3063           "what priority should compiler threads run at (-1 means no change)") \
3064                                                                             \
3065   product(intx, VMThreadPriority, -1,                                       \
3066           "what priority should VM threads run at (-1 means no change)")    \
3067                                                                             \
3068   product(bool, CompilerThreadHintNoPreempt, true,                          \
3069           "(Solaris only) Give compiler threads an extra quanta")           \
3070                                                                             \
3071   product(bool, VMThreadHintNoPreempt, false,                               \
3072           "(Solaris only) Give VM thread an extra quanta")                  \
3073                                                                             \
3074   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3075   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3076   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3077   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3078   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3079   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3080   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3081   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3082   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3083   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3084                                                                             \
3085   /* compiler debugging */                                                  \
3086   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3087           "First class to consider when using +CompileTheWorld")            \
3088                                                                             \
3089   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3090           "Last class to consider when using +CompileTheWorld")             \
3091                                                                             \
3092   develop(intx, NewCodeParameter,      0,                                   \
3093           "Testing Only: Create a dedicated integer parameter before "      \
3094           "putback")                                                        \
3095                                                                             \
3096   /* new oopmap storage allocation */                                       \
3097   develop(intx, MinOopMapAllocation,     8,                                 \
3098           "Minimum number of OopMap entries in an OopMapSet")               \
3099                                                                             \
3100   /* Background Compilation */                                              \
3101   develop(intx, LongCompileThreshold,     50,                               \
3102           "Used with +TraceLongCompiles")                                   \
3103                                                                             \
3104   product(intx, StarvationMonitorInterval,    200,                          \
3105           "Pause between each check in ms")                                 \
3106                                                                             \
3107   /* recompilation */                                                       \
3108   product_pd(intx, CompileThreshold,                                        \
3109           "number of interpreted method invocations before (re-)compiling") \
3110                                                                             \
3111   product_pd(intx, BackEdgeThreshold,                                       \
3112           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3113                                                                             \
3114   product(intx, Tier1BytecodeLimit,      10,                                \
3115           "Must have at least this many bytecodes before tier1"             \
3116           "invocation counters are used")                                   \
3117                                                                             \
3118   product_pd(intx, Tier2CompileThreshold,                                   \
3119           "threshold at which a tier 2 compilation is invoked")             \
3120                                                                             \
3121   product_pd(intx, Tier2BackEdgeThreshold,                                  \
3122           "Back edge threshold at which a tier 2 compilation is invoked")   \
3123                                                                             \
3124   product_pd(intx, Tier3CompileThreshold,                                   \
3125           "threshold at which a tier 3 compilation is invoked")             \
3126                                                                             \
3127   product_pd(intx, Tier3BackEdgeThreshold,                                  \
3128           "Back edge threshold at which a tier 3 compilation is invoked")   \
3129                                                                             \
3130   product_pd(intx, Tier4CompileThreshold,                                   \
3131           "threshold at which a tier 4 compilation is invoked")             \
3132                                                                             \
3133   product_pd(intx, Tier4BackEdgeThreshold,                                  \
3134           "Back edge threshold at which a tier 4 compilation is invoked")   \
3135                                                                             \
3136   product_pd(bool, TieredCompilation,                                       \
3137           "Enable two-tier compilation")                                    \
3138                                                                             \
3139   product(bool, StressTieredRuntime, false,                                 \
3140           "Alternate client and server compiler on compile requests")       \
3141                                                                             \
3142   product_pd(intx, OnStackReplacePercentage,                                \
3143           "NON_TIERED number of method invocations/branches (expressed as %"\
3144           "of CompileThreshold) before (re-)compiling OSR code")            \
3145                                                                             \
3146   product(intx, InterpreterProfilePercentage, 33,                           \
3147           "NON_TIERED number of method invocations/branches (expressed as %"\
3148           "of CompileThreshold) before profiling in the interpreter")       \
3149                                                                             \
3150   develop(intx, MaxRecompilationSearchLength,    10,                        \
3151           "max. # frames to inspect searching for recompilee")              \
3152                                                                             \
3153   develop(intx, MaxInterpretedSearchLength,     3,                          \
3154           "max. # interp. frames to skip when searching for recompilee")    \
3155                                                                             \
3156   develop(intx, DesiredMethodLimit,  8000,                                  \
3157           "desired max. method size (in bytecodes) after inlining")         \
3158                                                                             \
3159   develop(intx, HugeMethodLimit,  8000,                                     \
3160           "don't compile methods larger than this if "                      \
3161           "+DontCompileHugeMethods")                                        \
3162                                                                             \
3163   /* New JDK 1.4 reflection implementation */                               \
3164                                                                             \
3165   develop(bool, UseNewReflection, true,                                     \
3166           "Temporary flag for transition to reflection based on dynamic "   \
3167           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3168           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3169           "changes were needed")                                            \
3170                                                                             \
3171   develop(bool, VerifyReflectionBytecodes, false,                           \
3172           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3173           "in situations like that described in 4486457 or for "            \
3174           "constructors generated for serialization, so can not be enabled "\
3175           "in product.")                                                    \
3176                                                                             \
3177   product(bool, ReflectionWrapResolutionErrors, true,                       \
3178           "Temporary flag for transition to AbstractMethodError wrapped "   \
3179           "in InvocationTargetException. See 6531596")                      \
3180                                                                             \
3181                                                                             \
3182   develop(intx, FastSuperclassLimit, 8,                                     \
3183           "Depth of hardwired instanceof accelerator array")                \
3184                                                                             \
3185   /* Properties for Java libraries  */                                      \
3186                                                                             \
3187   product(intx, MaxDirectMemorySize, -1,                                    \
3188           "Maximum total size of NIO direct-buffer allocations")            \
3189                                                                             \
3190   /* temporary developer defined flags  */                                  \
3191                                                                             \
3192   diagnostic(bool, UseNewCode, false,                                       \
3193           "Testing Only: Use the new version while testing")                \
3194                                                                             \
3195   diagnostic(bool, UseNewCode2, false,                                      \
3196           "Testing Only: Use the new version while testing")                \
3197                                                                             \
3198   diagnostic(bool, UseNewCode3, false,                                      \
3199           "Testing Only: Use the new version while testing")                \
3200                                                                             \
3201   /* flags for performance data collection */                               \
3202                                                                             \
3203   product(bool, UsePerfData, true,                                          \
3204           "Flag to disable jvmstat instrumentation for performance testing" \
3205           "and problem isolation purposes.")                                \
3206                                                                             \
3207   product(bool, PerfDataSaveToFile, false,                                  \
3208           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3209                                                                             \
3210   product(ccstr, PerfDataSaveFile, NULL,                                    \
3211           "Save PerfData memory to the specified absolute pathname,"        \
3212            "%p in the file name if present will be replaced by pid")        \
3213                                                                             \
3214   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3215           "Data sampling interval in milliseconds")                         \
3216                                                                             \
3217   develop(bool, PerfTraceDataCreation, false,                               \
3218           "Trace creation of Performance Data Entries")                     \
3219                                                                             \
3220   develop(bool, PerfTraceMemOps, false,                                     \
3221           "Trace PerfMemory create/attach/detach calls")                    \
3222                                                                             \
3223   product(bool, PerfDisableSharedMem, false,                                \
3224           "Store performance data in standard memory")                      \
3225                                                                             \
3226   product(intx, PerfDataMemorySize, 32*K,                                   \
3227           "Size of performance data memory region. Will be rounded "        \
3228           "up to a multiple of the native os page size.")                   \
3229                                                                             \
3230   product(intx, PerfMaxStringConstLength, 1024,                             \
3231           "Maximum PerfStringConstant string length before truncation")     \
3232                                                                             \
3233   product(bool, PerfAllowAtExitRegistration, false,                         \
3234           "Allow registration of atexit() methods")                         \
3235                                                                             \
3236   product(bool, PerfBypassFileSystemCheck, false,                           \
3237           "Bypass Win32 file system criteria checks (Windows Only)")        \
3238                                                                             \
3239   product(intx, UnguardOnExecutionViolation, 0,                             \
3240           "Unguard page and retry on no-execute fault (Win32 only)"         \
3241           "0=off, 1=conservative, 2=aggressive")                            \
3242                                                                             \
3243   /* Serviceability Support */                                              \
3244                                                                             \
3245   product(bool, ManagementServer, false,                                    \
3246           "Create JMX Management Server")                                   \
3247                                                                             \
3248   product(bool, DisableAttachMechanism, false,                              \
3249          "Disable mechanism that allows tools to attach to this VM")        \
3250                                                                             \
3251   product(bool, StartAttachListener, false,                                 \
3252           "Always start Attach Listener at VM startup")                     \
3253                                                                             \
3254   manageable(bool, PrintConcurrentLocks, false,                             \
3255           "Print java.util.concurrent locks in thread dump")                \
3256                                                                             \
3257   /* Shared spaces */                                                       \
3258                                                                             \
3259   product(bool, UseSharedSpaces, true,                                      \
3260           "Use shared spaces in the permanent generation")                  \
3261                                                                             \
3262   product(bool, RequireSharedSpaces, false,                                 \
3263           "Require shared spaces in the permanent generation")              \
3264                                                                             \
3265   product(bool, ForceSharedSpaces, false,                                   \
3266           "Require shared spaces in the permanent generation")              \
3267                                                                             \
3268   product(bool, DumpSharedSpaces, false,                                    \
3269            "Special mode: JVM reads a class list, loads classes, builds "   \
3270             "shared spaces, and dumps the shared spaces to a file to be "   \
3271             "used in future JVM runs.")                                     \
3272                                                                             \
3273   product(bool, PrintSharedSpaces, false,                                   \
3274           "Print usage of shared spaces")                                   \
3275                                                                             \
3276   product(uintx, SharedDummyBlockSize, 512*M,                               \
3277           "Size of dummy block used to shift heap addresses (in bytes)")    \
3278                                                                             \
3279   product(uintx, SharedReadWriteSize,  12*M,                                \
3280           "Size of read-write space in permanent generation (in bytes)")    \
3281                                                                             \
3282   product(uintx, SharedReadOnlySize,    8*M,                                \
3283           "Size of read-only space in permanent generation (in bytes)")     \
3284                                                                             \
3285   product(uintx, SharedMiscDataSize,    4*M,                                \
3286           "Size of the shared data area adjacent to the heap (in bytes)")   \
3287                                                                             \
3288   product(uintx, SharedMiscCodeSize,    4*M,                                \
3289           "Size of the shared code area adjacent to the heap (in bytes)")   \
3290                                                                             \
3291   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3292           "At dump time, order shared objects to achieve better "           \
3293           "cold startup time.")                                             \
3294                                                                             \
3295   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3296           "Reordering policy for SharedOptimizeColdStart "                  \
3297           "0=favor classload-time locality, 1=balanced, "                   \
3298           "2=favor runtime locality")                                       \
3299                                                                             \
3300   diagnostic(bool, SharedSkipVerify, false,                                 \
3301           "Skip assert() and verify() which page-in unwanted shared "       \
3302           "objects. ")                                                      \
3303                                                                             \
3304   product(bool, AnonymousClasses, false,                                    \
3305           "support sun.misc.Unsafe.defineAnonymousClass")                   \
3306                                                                             \
3307   product(bool, EnableMethodHandles, false,                                 \
3308           "support method handles (true by default under JSR 292)")         \
3309                                                                             \
3310   diagnostic(intx, MethodHandlePushLimit, 3,                                \
3311           "number of additional stack slots a method handle may push")      \
3312                                                                             \
3313   develop(bool, TraceMethodHandles, false,                                  \
3314           "trace internal method handle operations")                        \
3315                                                                             \
3316   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3317           "perform extra checks when constructing method handles")          \
3318                                                                             \
3319   diagnostic(bool, OptimizeMethodHandles, true,                             \
3320           "when constructing method handles, try to improve them")          \
3321                                                                             \
3322   product(bool, EnableInvokeDynamic, false,                                 \
3323           "recognize the invokedynamic instruction")                        \
3324                                                                             \
3325   develop(bool, TraceInvokeDynamic, false,                                  \
3326           "trace internal invoke dynamic operations")                       \
3327                                                                             \
3328   product(bool, TaggedStackInterpreter, false,                              \
3329           "Insert tags in interpreter execution stack for oopmap generaion")\
3330                                                                             \
3331   diagnostic(bool, PauseAtStartup,      false,                              \
3332           "Causes the VM to pause at startup time and wait for the pause "  \
3333           "file to be removed (default: ./vm.paused.<pid>)")                \
3334                                                                             \
3335   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3336           "The file to create and for whose removal to await when pausing " \
3337           "at startup. (default: ./vm.paused.<pid>)")                       \
3338                                                                             \
3339   product(bool, ExtendedDTraceProbes,    false,                             \
3340           "Enable performance-impacting dtrace probes")                     \
3341                                                                             \
3342   product(bool, DTraceMethodProbes, false,                                  \
3343           "Enable dtrace probes for method-entry and method-exit")          \
3344                                                                             \
3345   product(bool, DTraceAllocProbes, false,                                   \
3346           "Enable dtrace probes for object allocation")                     \
3347                                                                             \
3348   product(bool, DTraceMonitorProbes, false,                                 \
3349           "Enable dtrace probes for monitor events")                        \
3350                                                                             \
3351   product(bool, RelaxAccessControlCheck, false,                             \
3352           "Relax the access control checks in the verifier")                \
3353                                                                             \
3354   diagnostic(bool, PrintDTraceDOF, false,                                   \
3355              "Print the DTrace DOF passed to the system for JSDT probes")   \
3356                                                                             \
3357   product(bool, UseVMInterruptibleIO, false,                                \
3358           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3359           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3360           " of this flag is true for JDK 6 and earliers")
3361 
3362 
3363 /*
3364  *  Macros for factoring of globals
3365  */
3366 
3367 // Interface macros
3368 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3369 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3370 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3371 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3372 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3373 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3374 #ifdef PRODUCT
3375 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3376 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3377 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3378 #else
3379 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3380 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3381 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3382 #endif
3383 // Special LP64 flags, product only needed for now.
3384 #ifdef _LP64
3385 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3386 #else
3387 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3388 #endif // _LP64
3389 
3390 // Implementation macros
3391 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3392 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3393 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3394 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3395 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3396 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3397 #ifdef PRODUCT
3398 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3399 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3400 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3401 #else
3402 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3403 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3404 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3405 #endif
3406 #ifdef _LP64
3407 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3408 #else
3409 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3410 #endif // _LP64
3411 
3412 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3413 
3414 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)