1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "gc/shared/gc_globals.hpp" 29 #include "utilities/align.hpp" 30 #include "utilities/globalDefinitions.hpp" 31 #include "utilities/macros.hpp" 32 33 #include <float.h> // for DBL_MAX 34 35 // The larger HeapWordSize for 64bit requires larger heaps 36 // for the same application running in 64bit. See bug 4967770. 37 // The minimum alignment to a heap word size is done. Other 38 // parts of the memory system may require additional alignment 39 // and are responsible for those alignments. 40 #ifdef _LP64 41 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 42 #else 43 #define ScaleForWordSize(x) (x) 44 #endif 45 46 // use this for flags that are true per default in the tiered build 47 // but false in non-tiered builds, and vice versa 48 #ifdef TIERED 49 #define trueInTiered true 50 #define falseInTiered false 51 #else 52 #define trueInTiered false 53 #define falseInTiered true 54 #endif 55 56 #include CPU_HEADER(globals) 57 #include OS_HEADER(globals) 58 #include OS_CPU_HEADER(globals) 59 #ifdef COMPILER1 60 #include CPU_HEADER(c1_globals) 61 #include OS_HEADER(c1_globals) 62 #endif 63 #ifdef COMPILER2 64 #include CPU_HEADER(c2_globals) 65 #include OS_HEADER(c2_globals) 66 #endif 67 68 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 69 define_pd_global(bool, BackgroundCompilation, false); 70 define_pd_global(bool, UseTLAB, false); 71 define_pd_global(bool, CICompileOSR, false); 72 define_pd_global(bool, UseTypeProfile, false); 73 define_pd_global(bool, UseOnStackReplacement, false); 74 define_pd_global(bool, InlineIntrinsics, false); 75 define_pd_global(bool, PreferInterpreterNativeStubs, true); 76 define_pd_global(bool, ProfileInterpreter, false); 77 define_pd_global(bool, ProfileTraps, false); 78 define_pd_global(bool, TieredCompilation, false); 79 80 define_pd_global(intx, CompileThreshold, 0); 81 82 define_pd_global(intx, OnStackReplacePercentage, 0); 83 define_pd_global(bool, ResizeTLAB, false); 84 define_pd_global(intx, FreqInlineSize, 0); 85 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 86 define_pd_global(bool, InlineClassNatives, true); 87 define_pd_global(bool, InlineUnsafeOps, true); 88 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 89 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 90 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 91 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 92 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 93 94 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 95 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 96 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 97 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 98 define_pd_global(bool, NeverActAsServerClassMachine, true); 99 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 100 #define CI_COMPILER_COUNT 0 101 #else 102 103 #if COMPILER2_OR_JVMCI 104 #define CI_COMPILER_COUNT 2 105 #else 106 #define CI_COMPILER_COUNT 1 107 #endif // COMPILER2_OR_JVMCI 108 109 #endif // no compilers 110 111 // string type aliases used only in this file 112 typedef const char* ccstr; 113 typedef const char* ccstrlist; // represents string arguments which accumulate 114 115 // function type that will construct default range string 116 typedef const char* (*RangeStrFunc)(void); 117 118 struct Flag { 119 enum Flags { 120 // latest value origin 121 DEFAULT = 0, 122 COMMAND_LINE = 1, 123 ENVIRON_VAR = 2, 124 CONFIG_FILE = 3, 125 MANAGEMENT = 4, 126 ERGONOMIC = 5, 127 ATTACH_ON_DEMAND = 6, 128 INTERNAL = 7, 129 130 LAST_VALUE_ORIGIN = INTERNAL, 131 VALUE_ORIGIN_BITS = 4, 132 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 133 134 // flag kind 135 KIND_PRODUCT = 1 << 4, 136 KIND_MANAGEABLE = 1 << 5, 137 KIND_DIAGNOSTIC = 1 << 6, 138 KIND_EXPERIMENTAL = 1 << 7, 139 KIND_NOT_PRODUCT = 1 << 8, 140 KIND_DEVELOP = 1 << 9, 141 KIND_PLATFORM_DEPENDENT = 1 << 10, 142 KIND_READ_WRITE = 1 << 11, 143 KIND_C1 = 1 << 12, 144 KIND_C2 = 1 << 13, 145 KIND_ARCH = 1 << 14, 146 KIND_LP64_PRODUCT = 1 << 15, 147 KIND_COMMERCIAL = 1 << 16, 148 KIND_JVMCI = 1 << 17, 149 150 // set this bit if the flag was set on the command line 151 ORIG_COMMAND_LINE = 1 << 18, 152 153 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 154 }; 155 156 enum Error { 157 // no error 158 SUCCESS = 0, 159 // flag name is missing 160 MISSING_NAME, 161 // flag value is missing 162 MISSING_VALUE, 163 // error parsing the textual form of the value 164 WRONG_FORMAT, 165 // flag is not writable 166 NON_WRITABLE, 167 // flag value is outside of its bounds 168 OUT_OF_BOUNDS, 169 // flag value violates its constraint 170 VIOLATES_CONSTRAINT, 171 // there is no flag with the given name 172 INVALID_FLAG, 173 // the flag can only be set only on command line during invocation of the VM 174 COMMAND_LINE_ONLY, 175 // the flag may only be set once 176 SET_ONLY_ONCE, 177 // the flag is not writable in this combination of product/debug build 178 CONSTANT, 179 // other, unspecified error related to setting the flag 180 ERR_OTHER 181 }; 182 183 enum MsgType { 184 NONE = 0, 185 DIAGNOSTIC_FLAG_BUT_LOCKED, 186 EXPERIMENTAL_FLAG_BUT_LOCKED, 187 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 188 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD, 189 COMMERCIAL_FLAG_BUT_DISABLED, 190 COMMERCIAL_FLAG_BUT_LOCKED 191 }; 192 193 const char* _type; 194 const char* _name; 195 void* _addr; 196 NOT_PRODUCT(const char* _doc;) 197 Flags _flags; 198 size_t _name_len; 199 200 // points to all Flags static array 201 static Flag* flags; 202 203 // number of flags 204 static size_t numFlags; 205 206 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 207 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 208 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 209 210 static const char* get_int_default_range_str(); 211 static const char* get_uint_default_range_str(); 212 static const char* get_intx_default_range_str(); 213 static const char* get_uintx_default_range_str(); 214 static const char* get_uint64_t_default_range_str(); 215 static const char* get_size_t_default_range_str(); 216 static const char* get_double_default_range_str(); 217 218 Flag::Error check_writable(bool changed); 219 220 bool is_bool() const; 221 bool get_bool() const; 222 Flag::Error set_bool(bool value); 223 224 bool is_int() const; 225 int get_int() const; 226 Flag::Error set_int(int value); 227 228 bool is_uint() const; 229 uint get_uint() const; 230 Flag::Error set_uint(uint value); 231 232 bool is_intx() const; 233 intx get_intx() const; 234 Flag::Error set_intx(intx value); 235 236 bool is_uintx() const; 237 uintx get_uintx() const; 238 Flag::Error set_uintx(uintx value); 239 240 bool is_uint64_t() const; 241 uint64_t get_uint64_t() const; 242 Flag::Error set_uint64_t(uint64_t value); 243 244 bool is_size_t() const; 245 size_t get_size_t() const; 246 Flag::Error set_size_t(size_t value); 247 248 bool is_double() const; 249 double get_double() const; 250 Flag::Error set_double(double value); 251 252 bool is_ccstr() const; 253 bool ccstr_accumulates() const; 254 ccstr get_ccstr() const; 255 Flag::Error set_ccstr(ccstr value); 256 257 Flags get_origin(); 258 void set_origin(Flags origin); 259 260 size_t get_name_length(); 261 262 bool is_default(); 263 bool is_ergonomic(); 264 bool is_command_line(); 265 void set_command_line(); 266 267 bool is_product() const; 268 bool is_manageable() const; 269 bool is_diagnostic() const; 270 bool is_experimental() const; 271 bool is_notproduct() const; 272 bool is_develop() const; 273 bool is_read_write() const; 274 bool is_commercial() const; 275 276 bool is_constant_in_binary() const; 277 278 bool is_unlocker() const; 279 bool is_unlocked() const; 280 bool is_writeable() const; 281 bool is_external() const; 282 283 bool is_unlocker_ext() const; 284 bool is_unlocked_ext() const; 285 bool is_writeable_ext() const; 286 bool is_external_ext() const; 287 288 void clear_diagnostic(); 289 290 Flag::MsgType get_locked_message(char*, int) const; 291 Flag::MsgType get_locked_message_ext(char*, int) const; 292 293 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 294 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 295 void print_kind(outputStream* st, unsigned int width); 296 void print_origin(outputStream* st, unsigned int width); 297 void print_as_flag(outputStream* st); 298 299 static const char* flag_error_str(Flag::Error error); 300 }; 301 302 // debug flags control various aspects of the VM and are global accessible 303 304 // use FlagSetting to temporarily change some debug flag 305 // e.g. FlagSetting fs(DebugThisAndThat, true); 306 // restored to previous value upon leaving scope 307 class FlagSetting { 308 bool val; 309 bool* flag; 310 public: 311 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 312 ~FlagSetting() { *flag = val; } 313 }; 314 315 316 class CounterSetting { 317 intx* counter; 318 public: 319 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 320 ~CounterSetting() { (*counter)--; } 321 }; 322 323 class IntFlagSetting { 324 int val; 325 int* flag; 326 public: 327 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 328 ~IntFlagSetting() { *flag = val; } 329 }; 330 331 class UIntFlagSetting { 332 uint val; 333 uint* flag; 334 public: 335 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 336 ~UIntFlagSetting() { *flag = val; } 337 }; 338 339 class UIntXFlagSetting { 340 uintx val; 341 uintx* flag; 342 public: 343 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 344 ~UIntXFlagSetting() { *flag = val; } 345 }; 346 347 class DoubleFlagSetting { 348 double val; 349 double* flag; 350 public: 351 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 352 ~DoubleFlagSetting() { *flag = val; } 353 }; 354 355 class SizeTFlagSetting { 356 size_t val; 357 size_t* flag; 358 public: 359 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 360 ~SizeTFlagSetting() { *flag = val; } 361 }; 362 363 // Helper class for temporarily saving the value of a flag during a scope. 364 template <size_t SIZE> 365 class FlagGuard { 366 unsigned char _value[SIZE]; 367 void* const _addr; 368 369 // Hide operator new, this class should only be allocated on the stack. 370 // NOTE: Cannot include memory/allocation.hpp here due to circular 371 // dependencies. 372 void* operator new(size_t size) throw(); 373 void* operator new [](size_t size) throw(); 374 375 public: 376 FlagGuard(void* flag_addr) : _addr(flag_addr) { 377 memcpy(_value, _addr, SIZE); 378 } 379 380 ~FlagGuard() { 381 memcpy(_addr, _value, SIZE); 382 } 383 }; 384 385 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 386 387 class CommandLineFlags { 388 public: 389 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 390 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 391 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 392 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 393 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 394 395 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 396 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 397 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 398 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 399 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 400 401 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 402 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 403 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 404 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 405 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 406 407 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 408 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 409 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 410 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 411 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 412 413 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 414 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 415 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 416 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 417 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 418 419 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 420 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 421 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 422 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 423 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 424 425 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 426 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 427 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 428 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 429 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 430 431 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 432 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 433 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 434 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 435 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 436 437 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 438 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 439 // Contract: Flag will make private copy of the incoming value. 440 // Outgoing value is always malloc-ed, and caller MUST call free. 441 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 442 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 443 444 // Returns false if name is not a command line flag. 445 static bool wasSetOnCmdline(const char* name, bool* value); 446 static void printSetFlags(outputStream* out); 447 448 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 449 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 450 451 static void verify() PRODUCT_RETURN; 452 }; 453 454 // use this for flags that are true by default in the debug version but 455 // false in the optimized version, and vice versa 456 #ifdef ASSERT 457 #define trueInDebug true 458 #define falseInDebug false 459 #else 460 #define trueInDebug false 461 #define falseInDebug true 462 #endif 463 464 // use this for flags that are true per default in the product build 465 // but false in development builds, and vice versa 466 #ifdef PRODUCT 467 #define trueInProduct true 468 #define falseInProduct false 469 #else 470 #define trueInProduct false 471 #define falseInProduct true 472 #endif 473 474 // develop flags are settable / visible only during development and are constant in the PRODUCT version 475 // product flags are always settable / visible 476 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 477 478 // A flag must be declared with one of the following types: 479 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 480 // The type "ccstr" is an alias for "const char*" and is used 481 // only in this file, because the macrology requires single-token type names. 482 483 // Note: Diagnostic options not meant for VM tuning or for product modes. 484 // They are to be used for VM quality assurance or field diagnosis 485 // of VM bugs. They are hidden so that users will not be encouraged to 486 // try them as if they were VM ordinary execution options. However, they 487 // are available in the product version of the VM. Under instruction 488 // from support engineers, VM customers can turn them on to collect 489 // diagnostic information about VM problems. To use a VM diagnostic 490 // option, you must first specify +UnlockDiagnosticVMOptions. 491 // (This master switch also affects the behavior of -Xprintflags.) 492 // 493 // experimental flags are in support of features that are not 494 // part of the officially supported product, but are available 495 // for experimenting with. They could, for example, be performance 496 // features that may not have undergone full or rigorous QA, but which may 497 // help performance in some cases and released for experimentation 498 // by the community of users and developers. This flag also allows one to 499 // be able to build a fully supported product that nonetheless also 500 // ships with some unsupported, lightly tested, experimental features. 501 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 502 // UnlockExperimentalVMOptions flag, which allows the control and 503 // modification of the experimental flags. 504 // 505 // Nota bene: neither diagnostic nor experimental options should be used casually, 506 // and they are not supported on production loads, except under explicit 507 // direction from support engineers. 508 // 509 // manageable flags are writeable external product flags. 510 // They are dynamically writeable through the JDK management interface 511 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 512 // These flags are external exported interface (see CCC). The list of 513 // manageable flags can be queried programmatically through the management 514 // interface. 515 // 516 // A flag can be made as "manageable" only if 517 // - the flag is defined in a CCC as an external exported interface. 518 // - the VM implementation supports dynamic setting of the flag. 519 // This implies that the VM must *always* query the flag variable 520 // and not reuse state related to the flag state at any given time. 521 // - you want the flag to be queried programmatically by the customers. 522 // 523 // product_rw flags are writeable internal product flags. 524 // They are like "manageable" flags but for internal/private use. 525 // The list of product_rw flags are internal/private flags which 526 // may be changed/removed in a future release. It can be set 527 // through the management interface to get/set value 528 // when the name of flag is supplied. 529 // 530 // A flag can be made as "product_rw" only if 531 // - the VM implementation supports dynamic setting of the flag. 532 // This implies that the VM must *always* query the flag variable 533 // and not reuse state related to the flag state at any given time. 534 // 535 // Note that when there is a need to support develop flags to be writeable, 536 // it can be done in the same way as product_rw. 537 // 538 // range is a macro that will expand to min and max arguments for range 539 // checking code if provided - see commandLineFlagRangeList.hpp 540 // 541 // constraint is a macro that will expand to custom function call 542 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 543 // 544 // writeable is a macro that controls if and how the value can change during the runtime 545 // 546 // writeable(Always) is optional and allows the flag to have its value changed 547 // without any limitations at any time 548 // 549 // writeable(Once) flag value's can be only set once during the lifetime of VM 550 // 551 // writeable(CommandLineOnly) flag value's can be only set from command line 552 // (multiple times allowed) 553 // 554 555 556 #define RUNTIME_FLAGS(develop, \ 557 develop_pd, \ 558 product, \ 559 product_pd, \ 560 diagnostic, \ 561 diagnostic_pd, \ 562 experimental, \ 563 notproduct, \ 564 manageable, \ 565 product_rw, \ 566 lp64_product, \ 567 range, \ 568 constraint, \ 569 writeable) \ 570 \ 571 lp64_product(bool, UseCompressedOops, false, \ 572 "Use 32-bit object references in 64-bit VM. " \ 573 "lp64_product means flag is always constant in 32 bit VM") \ 574 \ 575 lp64_product(bool, UseCompressedClassPointers, false, \ 576 "Use 32-bit class pointers in 64-bit VM. " \ 577 "lp64_product means flag is always constant in 32 bit VM") \ 578 \ 579 notproduct(bool, CheckCompressedOops, true, \ 580 "Generate checks in encoding/decoding code in debug VM") \ 581 \ 582 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 583 "Heap allocation steps through preferred address regions to find" \ 584 " where it can allocate the heap. Number of steps to take per " \ 585 "region.") \ 586 range(1, max_uintx) \ 587 \ 588 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 589 "Default object alignment in bytes, 8 is minimum") \ 590 range(8, 256) \ 591 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 592 \ 593 product(bool, AssumeMP, true, \ 594 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 595 \ 596 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 597 /* removal testing. It was supposed to be removed before FCS but has */ \ 598 /* been re-added (see 6401008) */ \ 599 product_pd(bool, UseMembar, \ 600 "(Unstable) Issues membars on thread state transitions") \ 601 \ 602 develop(bool, CleanChunkPoolAsync, true, \ 603 "Clean the chunk pool asynchronously") \ 604 \ 605 product_pd(bool, ThreadLocalHandshakes, \ 606 "Use thread-local polls instead of global poll for safepoints.") \ 607 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 608 \ 609 diagnostic(uint, HandshakeTimeout, 0, \ 610 "If nonzero set a timeout in milliseconds for handshakes") \ 611 \ 612 experimental(bool, AlwaysSafeConstructors, false, \ 613 "Force safe construction, as if all fields are final.") \ 614 \ 615 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 616 "Enable normal processing of flags relating to field diagnostics")\ 617 \ 618 experimental(bool, UnlockExperimentalVMOptions, false, \ 619 "Enable normal processing of flags relating to experimental " \ 620 "features") \ 621 \ 622 product(bool, JavaMonitorsInStackTrace, true, \ 623 "Print information about Java monitor locks when the stacks are" \ 624 "dumped") \ 625 \ 626 product_pd(bool, UseLargePages, \ 627 "Use large page memory") \ 628 \ 629 product_pd(bool, UseLargePagesIndividualAllocation, \ 630 "Allocate large pages individually for better affinity") \ 631 \ 632 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 633 "Fail large pages individual allocation") \ 634 \ 635 product(bool, UseLargePagesInMetaspace, false, \ 636 "Use large page memory in metaspace. " \ 637 "Only used if UseLargePages is enabled.") \ 638 \ 639 product(bool, UseNUMA, false, \ 640 "Use NUMA if available") \ 641 \ 642 product(bool, UseNUMAInterleaving, false, \ 643 "Interleave memory across NUMA nodes if available") \ 644 \ 645 product(size_t, NUMAInterleaveGranularity, 2*M, \ 646 "Granularity to use for NUMA interleaving on Windows OS") \ 647 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 648 \ 649 product(bool, ForceNUMA, false, \ 650 "Force NUMA optimizations on single-node/UMA systems") \ 651 \ 652 product(uintx, NUMAChunkResizeWeight, 20, \ 653 "Percentage (0-100) used to weight the current sample when " \ 654 "computing exponentially decaying average for " \ 655 "AdaptiveNUMAChunkSizing") \ 656 range(0, 100) \ 657 \ 658 product(size_t, NUMASpaceResizeRate, 1*G, \ 659 "Do not reallocate more than this amount per collection") \ 660 range(0, max_uintx) \ 661 \ 662 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 663 "Enable adaptive chunk sizing for NUMA") \ 664 \ 665 product(bool, NUMAStats, false, \ 666 "Print NUMA stats in detailed heap information") \ 667 \ 668 product(uintx, NUMAPageScanRate, 256, \ 669 "Maximum number of pages to include in the page scan procedure") \ 670 range(0, max_uintx) \ 671 \ 672 product_pd(bool, NeedsDeoptSuspend, \ 673 "True for register window machines (sparc/ia64)") \ 674 \ 675 product(intx, UseSSE, 99, \ 676 "Highest supported SSE instructions set on x86/x64") \ 677 range(0, 99) \ 678 \ 679 product(bool, UseAES, false, \ 680 "Control whether AES instructions are used when available") \ 681 \ 682 product(bool, UseFMA, false, \ 683 "Control whether FMA instructions are used when available") \ 684 \ 685 product(bool, UseSHA, false, \ 686 "Control whether SHA instructions are used when available") \ 687 \ 688 diagnostic(bool, UseGHASHIntrinsics, false, \ 689 "Use intrinsics for GHASH versions of crypto") \ 690 \ 691 product(size_t, LargePageSizeInBytes, 0, \ 692 "Large page size (0 to let VM choose the page size)") \ 693 range(0, max_uintx) \ 694 \ 695 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 696 "Use large pages if maximum heap is at least this big") \ 697 range(0, max_uintx) \ 698 \ 699 product(bool, ForceTimeHighResolution, false, \ 700 "Using high time resolution (for Win32 only)") \ 701 \ 702 develop(bool, TracePcPatching, false, \ 703 "Trace usage of frame::patch_pc") \ 704 \ 705 develop(bool, TraceRelocator, false, \ 706 "Trace the bytecode relocator") \ 707 \ 708 develop(bool, TraceLongCompiles, false, \ 709 "Print out every time compilation is longer than " \ 710 "a given threshold") \ 711 \ 712 develop(bool, SafepointALot, false, \ 713 "Generate a lot of safepoints. This works with " \ 714 "GuaranteedSafepointInterval") \ 715 \ 716 product_pd(bool, BackgroundCompilation, \ 717 "A thread requesting compilation is not blocked during " \ 718 "compilation") \ 719 \ 720 product(bool, PrintVMQWaitTime, false, \ 721 "Print out the waiting time in VM operation queue") \ 722 \ 723 product(bool, MethodFlushing, true, \ 724 "Reclamation of zombie and not-entrant methods") \ 725 \ 726 develop(bool, VerifyStack, false, \ 727 "Verify stack of each thread when it is entering a runtime call") \ 728 \ 729 diagnostic(bool, ForceUnreachable, false, \ 730 "Make all non code cache addresses to be unreachable by " \ 731 "forcing use of 64bit literal fixups") \ 732 \ 733 notproduct(bool, StressDerivedPointers, false, \ 734 "Force scavenge when a derived pointer is detected on stack " \ 735 "after rtm call") \ 736 \ 737 develop(bool, TraceDerivedPointers, false, \ 738 "Trace traversal of derived pointers on stack") \ 739 \ 740 notproduct(bool, TraceCodeBlobStacks, false, \ 741 "Trace stack-walk of codeblobs") \ 742 \ 743 product(bool, PrintJNIResolving, false, \ 744 "Used to implement -v:jni") \ 745 \ 746 notproduct(bool, PrintRewrites, false, \ 747 "Print methods that are being rewritten") \ 748 \ 749 product(bool, UseInlineCaches, true, \ 750 "Use Inline Caches for virtual calls ") \ 751 \ 752 diagnostic(bool, InlineArrayCopy, true, \ 753 "Inline arraycopy native that is known to be part of " \ 754 "base library DLL") \ 755 \ 756 diagnostic(bool, InlineObjectHash, true, \ 757 "Inline Object::hashCode() native that is known to be part " \ 758 "of base library DLL") \ 759 \ 760 diagnostic(bool, InlineNatives, true, \ 761 "Inline natives that are known to be part of base library DLL") \ 762 \ 763 diagnostic(bool, InlineMathNatives, true, \ 764 "Inline SinD, CosD, etc.") \ 765 \ 766 diagnostic(bool, InlineClassNatives, true, \ 767 "Inline Class.isInstance, etc") \ 768 \ 769 diagnostic(bool, InlineThreadNatives, true, \ 770 "Inline Thread.currentThread, etc") \ 771 \ 772 diagnostic(bool, InlineUnsafeOps, true, \ 773 "Inline memory ops (native methods) from Unsafe") \ 774 \ 775 product(bool, CriticalJNINatives, true, \ 776 "Check for critical JNI entry points") \ 777 \ 778 notproduct(bool, StressCriticalJNINatives, false, \ 779 "Exercise register saving code in critical natives") \ 780 \ 781 diagnostic(bool, UseAESIntrinsics, false, \ 782 "Use intrinsics for AES versions of crypto") \ 783 \ 784 diagnostic(bool, UseAESCTRIntrinsics, false, \ 785 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 786 \ 787 diagnostic(bool, UseSHA1Intrinsics, false, \ 788 "Use intrinsics for SHA-1 crypto hash function. " \ 789 "Requires that UseSHA is enabled.") \ 790 \ 791 diagnostic(bool, UseSHA256Intrinsics, false, \ 792 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 793 "Requires that UseSHA is enabled.") \ 794 \ 795 diagnostic(bool, UseSHA512Intrinsics, false, \ 796 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 797 "Requires that UseSHA is enabled.") \ 798 \ 799 diagnostic(bool, UseCRC32Intrinsics, false, \ 800 "use intrinsics for java.util.zip.CRC32") \ 801 \ 802 diagnostic(bool, UseCRC32CIntrinsics, false, \ 803 "use intrinsics for java.util.zip.CRC32C") \ 804 \ 805 diagnostic(bool, UseAdler32Intrinsics, false, \ 806 "use intrinsics for java.util.zip.Adler32") \ 807 \ 808 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 809 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 810 \ 811 diagnostic(ccstrlist, DisableIntrinsic, "", \ 812 "do not expand intrinsics whose (internal) names appear here") \ 813 \ 814 develop(bool, TraceCallFixup, false, \ 815 "Trace all call fixups") \ 816 \ 817 develop(bool, DeoptimizeALot, false, \ 818 "Deoptimize at every exit from the runtime system") \ 819 \ 820 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 821 "A comma separated list of bcis to deoptimize at") \ 822 \ 823 product(bool, DeoptimizeRandom, false, \ 824 "Deoptimize random frames on random exit from the runtime system")\ 825 \ 826 notproduct(bool, ZombieALot, false, \ 827 "Create zombies (non-entrant) at exit from the runtime system") \ 828 \ 829 product(bool, UnlinkSymbolsALot, false, \ 830 "Unlink unreferenced symbols from the symbol table at safepoints")\ 831 \ 832 notproduct(bool, WalkStackALot, false, \ 833 "Trace stack (no print) at every exit from the runtime system") \ 834 \ 835 product(bool, Debugging, false, \ 836 "Set when executing debug methods in debug.cpp " \ 837 "(to prevent triggering assertions)") \ 838 \ 839 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 840 "Enable strict checks that safepoints cannot happen for threads " \ 841 "that use NoSafepointVerifier") \ 842 \ 843 notproduct(bool, VerifyLastFrame, false, \ 844 "Verify oops on last frame on entry to VM") \ 845 \ 846 product(bool, FailOverToOldVerifier, true, \ 847 "Fail over to old verifier when split verifier fails") \ 848 \ 849 product(bool, SafepointTimeout, false, \ 850 "Time out and warn or fail after SafepointTimeoutDelay " \ 851 "milliseconds if failed to reach safepoint") \ 852 \ 853 develop(bool, DieOnSafepointTimeout, false, \ 854 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 855 \ 856 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 857 /* typically, at most a few retries are needed */ \ 858 product(intx, SuspendRetryCount, 50, \ 859 "Maximum retry count for an external suspend request") \ 860 range(0, max_intx) \ 861 \ 862 product(intx, SuspendRetryDelay, 5, \ 863 "Milliseconds to delay per retry (* current_retry_count)") \ 864 range(0, max_intx) \ 865 \ 866 product(bool, AssertOnSuspendWaitFailure, false, \ 867 "Assert/Guarantee on external suspend wait failure") \ 868 \ 869 product(bool, TraceSuspendWaitFailures, false, \ 870 "Trace external suspend wait failures") \ 871 \ 872 product(bool, MaxFDLimit, true, \ 873 "Bump the number of file descriptors to maximum in Solaris") \ 874 \ 875 diagnostic(bool, LogEvents, true, \ 876 "Enable the various ring buffer event logs") \ 877 \ 878 diagnostic(uintx, LogEventsBufferEntries, 10, \ 879 "Number of ring buffer event logs") \ 880 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 881 \ 882 product(bool, BytecodeVerificationRemote, true, \ 883 "Enable the Java bytecode verifier for remote classes") \ 884 \ 885 product(bool, BytecodeVerificationLocal, false, \ 886 "Enable the Java bytecode verifier for local classes") \ 887 \ 888 develop(bool, ForceFloatExceptions, trueInDebug, \ 889 "Force exceptions on FP stack under/overflow") \ 890 \ 891 develop(bool, VerifyStackAtCalls, false, \ 892 "Verify that the stack pointer is unchanged after calls") \ 893 \ 894 develop(bool, TraceJavaAssertions, false, \ 895 "Trace java language assertions") \ 896 \ 897 notproduct(bool, VerifyCodeCache, false, \ 898 "Verify code cache on memory allocation/deallocation") \ 899 \ 900 develop(bool, UseMallocOnly, false, \ 901 "Use only malloc/free for allocation (no resource area/arena)") \ 902 \ 903 develop(bool, PrintMallocStatistics, false, \ 904 "Print malloc/free statistics") \ 905 \ 906 develop(bool, ZapResourceArea, trueInDebug, \ 907 "Zap freed resource/arena space with 0xABABABAB") \ 908 \ 909 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 910 "Zap freed VM handle space with 0xBCBCBCBC") \ 911 \ 912 notproduct(bool, ZapStackSegments, trueInDebug, \ 913 "Zap allocated/freed stack segments with 0xFADFADED") \ 914 \ 915 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 916 "Zap unused heap space with 0xBAADBABE") \ 917 \ 918 develop(bool, CheckZapUnusedHeapArea, false, \ 919 "Check zapping of unused heap space") \ 920 \ 921 develop(bool, ZapFillerObjects, trueInDebug, \ 922 "Zap filler objects with 0xDEAFBABE") \ 923 \ 924 develop(bool, PrintVMMessages, true, \ 925 "Print VM messages on console") \ 926 \ 927 notproduct(uintx, ErrorHandlerTest, 0, \ 928 "If > 0, provokes an error after VM initialization; the value " \ 929 "determines which error to provoke. See test_error_handler() " \ 930 "in vmError.cpp.") \ 931 \ 932 notproduct(uintx, TestCrashInErrorHandler, 0, \ 933 "If > 0, provokes an error inside VM error handler (a secondary " \ 934 "crash). see test_error_handler() in vmError.cpp") \ 935 \ 936 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 937 "If true, tests SafeFetch inside error handler.") \ 938 \ 939 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 940 "If true, simulates an unresponsive error handler.") \ 941 \ 942 develop(bool, Verbose, false, \ 943 "Print additional debugging information from other modes") \ 944 \ 945 develop(bool, PrintMiscellaneous, false, \ 946 "Print uncategorized debugging information (requires +Verbose)") \ 947 \ 948 develop(bool, WizardMode, false, \ 949 "Print much more debugging information") \ 950 \ 951 product(bool, ShowMessageBoxOnError, false, \ 952 "Keep process alive on VM fatal error") \ 953 \ 954 product(bool, CreateCoredumpOnCrash, true, \ 955 "Create core/mini dump on VM fatal error") \ 956 \ 957 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 958 "Timeout, in seconds, to limit the time spent on writing an " \ 959 "error log in case of a crash.") \ 960 range(0, (uint64_t)max_jlong/1000) \ 961 \ 962 product_pd(bool, UseOSErrorReporting, \ 963 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 964 \ 965 product(bool, SuppressFatalErrorMessage, false, \ 966 "Report NO fatal error message (avoid deadlock)") \ 967 \ 968 product(ccstrlist, OnError, "", \ 969 "Run user-defined commands on fatal error; see VMError.cpp " \ 970 "for examples") \ 971 \ 972 product(ccstrlist, OnOutOfMemoryError, "", \ 973 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 974 \ 975 manageable(bool, HeapDumpBeforeFullGC, false, \ 976 "Dump heap to file before any major stop-the-world GC") \ 977 \ 978 manageable(bool, HeapDumpAfterFullGC, false, \ 979 "Dump heap to file after any major stop-the-world GC") \ 980 \ 981 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 982 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 983 \ 984 manageable(ccstr, HeapDumpPath, NULL, \ 985 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 986 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 987 "in the working directory)") \ 988 \ 989 develop(bool, BreakAtWarning, false, \ 990 "Execute breakpoint upon encountering VM warning") \ 991 \ 992 develop(bool, UseFakeTimers, false, \ 993 "Tell whether the VM should use system time or a fake timer") \ 994 \ 995 product(ccstr, NativeMemoryTracking, "off", \ 996 "Native memory tracking options") \ 997 \ 998 diagnostic(bool, PrintNMTStatistics, false, \ 999 "Print native memory tracking summary data if it is on") \ 1000 \ 1001 diagnostic(bool, LogCompilation, false, \ 1002 "Log compilation activity in detail to LogFile") \ 1003 \ 1004 product(bool, PrintCompilation, false, \ 1005 "Print compilations") \ 1006 \ 1007 diagnostic(bool, TraceNMethodInstalls, false, \ 1008 "Trace nmethod installation") \ 1009 \ 1010 diagnostic(intx, ScavengeRootsInCode, 2, \ 1011 "0: do not allow scavengable oops in the code cache; " \ 1012 "1: allow scavenging from the code cache; " \ 1013 "2: emit as many constants as the compiler can see") \ 1014 range(0, 2) \ 1015 \ 1016 product(bool, AlwaysRestoreFPU, false, \ 1017 "Restore the FPU control word after every JNI call (expensive)") \ 1018 \ 1019 diagnostic(bool, PrintCompilation2, false, \ 1020 "Print additional statistics per compilation") \ 1021 \ 1022 diagnostic(bool, PrintAdapterHandlers, false, \ 1023 "Print code generated for i2c/c2i adapters") \ 1024 \ 1025 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1026 "Verify that i2c/c2i adapters are called properly") \ 1027 \ 1028 develop(bool, VerifyAdapterSharing, false, \ 1029 "Verify that the code for shared adapters is the equivalent") \ 1030 \ 1031 diagnostic(bool, PrintAssembly, false, \ 1032 "Print assembly code (using external disassembler.so)") \ 1033 \ 1034 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1035 "Print options string passed to disassembler.so") \ 1036 \ 1037 notproduct(bool, PrintNMethodStatistics, false, \ 1038 "Print a summary statistic for the generated nmethods") \ 1039 \ 1040 diagnostic(bool, PrintNMethods, false, \ 1041 "Print assembly code for nmethods when generated") \ 1042 \ 1043 diagnostic(bool, PrintNativeNMethods, false, \ 1044 "Print assembly code for native nmethods when generated") \ 1045 \ 1046 develop(bool, PrintDebugInfo, false, \ 1047 "Print debug information for all nmethods when generated") \ 1048 \ 1049 develop(bool, PrintRelocations, false, \ 1050 "Print relocation information for all nmethods when generated") \ 1051 \ 1052 develop(bool, PrintDependencies, false, \ 1053 "Print dependency information for all nmethods when generated") \ 1054 \ 1055 develop(bool, PrintExceptionHandlers, false, \ 1056 "Print exception handler tables for all nmethods when generated") \ 1057 \ 1058 develop(bool, StressCompiledExceptionHandlers, false, \ 1059 "Exercise compiled exception handlers") \ 1060 \ 1061 develop(bool, InterceptOSException, false, \ 1062 "Start debugger when an implicit OS (e.g. NULL) " \ 1063 "exception happens") \ 1064 \ 1065 product(bool, PrintCodeCache, false, \ 1066 "Print the code cache memory usage when exiting") \ 1067 \ 1068 develop(bool, PrintCodeCache2, false, \ 1069 "Print detailed usage information on the code cache when exiting")\ 1070 \ 1071 product(bool, PrintCodeCacheOnCompilation, false, \ 1072 "Print the code cache memory usage each time a method is " \ 1073 "compiled") \ 1074 \ 1075 diagnostic(bool, PrintStubCode, false, \ 1076 "Print generated stub code") \ 1077 \ 1078 product(bool, StackTraceInThrowable, true, \ 1079 "Collect backtrace in throwable when exception happens") \ 1080 \ 1081 product(bool, OmitStackTraceInFastThrow, true, \ 1082 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1083 \ 1084 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1085 "Print bytecode statistics when dumping profiler output") \ 1086 \ 1087 product(bool, ProfilerRecordPC, false, \ 1088 "Collect ticks for each 16 byte interval of compiled code") \ 1089 \ 1090 product(bool, ProfileVM, false, \ 1091 "Profile ticks that fall within VM (either in the VM Thread " \ 1092 "or VM code called through stubs)") \ 1093 \ 1094 product(bool, ProfileIntervals, false, \ 1095 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1096 \ 1097 notproduct(bool, ProfilerCheckIntervals, false, \ 1098 "Collect and print information on spacing of profiler ticks") \ 1099 \ 1100 product(bool, PrintWarnings, true, \ 1101 "Print JVM warnings to output stream") \ 1102 \ 1103 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1104 "Print warnings for stalled SpinLocks") \ 1105 \ 1106 product(bool, RegisterFinalizersAtInit, true, \ 1107 "Register finalizable objects at end of Object.<init> or " \ 1108 "after allocation") \ 1109 \ 1110 develop(bool, RegisterReferences, true, \ 1111 "Tell whether the VM should register soft/weak/final/phantom " \ 1112 "references") \ 1113 \ 1114 develop(bool, IgnoreRewrites, false, \ 1115 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1116 "This is unsafe!") \ 1117 \ 1118 develop(bool, PrintCodeCacheExtension, false, \ 1119 "Print extension of code cache") \ 1120 \ 1121 develop(bool, UsePrivilegedStack, true, \ 1122 "Enable the security JVM functions") \ 1123 \ 1124 develop(bool, ProtectionDomainVerification, true, \ 1125 "Verify protection domain before resolution in system dictionary")\ 1126 \ 1127 product(bool, ClassUnloading, true, \ 1128 "Do unloading of classes") \ 1129 \ 1130 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1131 "Do unloading of classes with a concurrent marking cycle") \ 1132 \ 1133 develop(bool, DisableStartThread, false, \ 1134 "Disable starting of additional Java threads " \ 1135 "(for debugging only)") \ 1136 \ 1137 develop(bool, MemProfiling, false, \ 1138 "Write memory usage profiling to log file") \ 1139 \ 1140 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1141 "Print the system dictionary at exit") \ 1142 \ 1143 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1144 "Dynamically resize system dictionaries as needed") \ 1145 \ 1146 product(bool, AlwaysLockClassLoader, false, \ 1147 "Require the VM to acquire the class loader lock before calling " \ 1148 "loadClass() even for class loaders registering " \ 1149 "as parallel capable") \ 1150 \ 1151 product(bool, AllowParallelDefineClass, false, \ 1152 "Allow parallel defineClass requests for class loaders " \ 1153 "registering as parallel capable") \ 1154 \ 1155 product_pd(bool, DontYieldALot, \ 1156 "Throw away obvious excess yield calls") \ 1157 \ 1158 develop(bool, UseDetachedThreads, true, \ 1159 "Use detached threads that are recycled upon termination " \ 1160 "(for Solaris only)") \ 1161 \ 1162 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1163 "Disable the use of stack guard pages if the JVM is loaded " \ 1164 "on the primordial process thread") \ 1165 \ 1166 product(bool, UseLWPSynchronization, true, \ 1167 "Use LWP-based instead of libthread-based synchronization " \ 1168 "(SPARC only)") \ 1169 \ 1170 experimental(ccstr, SyncKnobs, NULL, \ 1171 "(Unstable) Various monitor synchronization tunables") \ 1172 \ 1173 experimental(intx, EmitSync, 0, \ 1174 "(Unsafe, Unstable) " \ 1175 "Control emission of inline sync fast-path code") \ 1176 \ 1177 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1178 range(0, max_jint) \ 1179 \ 1180 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1181 \ 1182 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1183 "Percentage of used monitors before triggering cleanup " \ 1184 "safepoint which deflates monitors (0 is off). " \ 1185 "The check is performed on GuaranteedSafepointInterval.") \ 1186 range(0, 100) \ 1187 \ 1188 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1189 "Experimental Sync flags") \ 1190 \ 1191 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1192 \ 1193 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1194 \ 1195 experimental(intx, hashCode, 5, \ 1196 "(Unstable) select hashCode generation algorithm") \ 1197 \ 1198 product(bool, FilterSpuriousWakeups, true, \ 1199 "When true prevents OS-level spurious, or premature, wakeups " \ 1200 "from Object.wait (Ignored for Windows)") \ 1201 \ 1202 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1203 \ 1204 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1205 \ 1206 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1207 \ 1208 develop(bool, UsePthreads, false, \ 1209 "Use pthread-based instead of libthread-based synchronization " \ 1210 "(SPARC only)") \ 1211 \ 1212 product(bool, ReduceSignalUsage, false, \ 1213 "Reduce the use of OS signals in Java and/or the VM") \ 1214 \ 1215 develop_pd(bool, ShareVtableStubs, \ 1216 "Share vtable stubs (smaller code but worse branch prediction") \ 1217 \ 1218 develop(bool, LoadLineNumberTables, true, \ 1219 "Tell whether the class file parser loads line number tables") \ 1220 \ 1221 develop(bool, LoadLocalVariableTables, true, \ 1222 "Tell whether the class file parser loads local variable tables") \ 1223 \ 1224 develop(bool, LoadLocalVariableTypeTables, true, \ 1225 "Tell whether the class file parser loads local variable type" \ 1226 "tables") \ 1227 \ 1228 product(bool, AllowUserSignalHandlers, false, \ 1229 "Do not complain if the application installs signal handlers " \ 1230 "(Solaris & Linux only)") \ 1231 \ 1232 product(bool, UseSignalChaining, true, \ 1233 "Use signal-chaining to invoke signal handlers installed " \ 1234 "by the application (Solaris & Linux only)") \ 1235 \ 1236 product(bool, AllowJNIEnvProxy, false, \ 1237 "Allow JNIEnv proxies for jdbx") \ 1238 \ 1239 product(bool, RestoreMXCSROnJNICalls, false, \ 1240 "Restore MXCSR when returning from JNI calls") \ 1241 \ 1242 product(bool, CheckJNICalls, false, \ 1243 "Verify all arguments to JNI calls") \ 1244 \ 1245 product(bool, UseFastJNIAccessors, true, \ 1246 "Use optimized versions of Get<Primitive>Field") \ 1247 \ 1248 product(intx, MaxJNILocalCapacity, 65536, \ 1249 "Maximum allowable local JNI handle capacity to " \ 1250 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1251 "where <= 0 is unlimited, default: 65536") \ 1252 range(min_intx, max_intx) \ 1253 \ 1254 product(bool, EagerXrunInit, false, \ 1255 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1256 "but not all -Xrun libraries may support the state of the VM " \ 1257 "at this time") \ 1258 \ 1259 product(bool, PreserveAllAnnotations, false, \ 1260 "Preserve RuntimeInvisibleAnnotations as well " \ 1261 "as RuntimeVisibleAnnotations") \ 1262 \ 1263 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1264 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1265 \ 1266 product(bool, UseXMMForArrayCopy, false, \ 1267 "Use SSE2 MOVQ instruction for Arraycopy") \ 1268 \ 1269 product(intx, FieldsAllocationStyle, 1, \ 1270 "0 - type based with oops first, " \ 1271 "1 - with oops last, " \ 1272 "2 - oops in super and sub classes are together") \ 1273 range(0, 2) \ 1274 \ 1275 product(bool, CompactFields, true, \ 1276 "Allocate nonstatic fields in gaps between previous fields") \ 1277 \ 1278 notproduct(bool, PrintFieldLayout, false, \ 1279 "Print field layout for each class") \ 1280 \ 1281 /* Need to limit the extent of the padding to reasonable size. */\ 1282 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1283 /* aggressive prefetching, while still leaving the room for segregating */\ 1284 /* among the distinct pages. */\ 1285 product(intx, ContendedPaddingWidth, 128, \ 1286 "How many bytes to pad the fields/classes marked @Contended with")\ 1287 range(0, 8192) \ 1288 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1289 \ 1290 product(bool, EnableContended, true, \ 1291 "Enable @Contended annotation support") \ 1292 \ 1293 product(bool, RestrictContended, true, \ 1294 "Restrict @Contended to trusted classes") \ 1295 \ 1296 product(bool, UseBiasedLocking, true, \ 1297 "Enable biased locking in JVM") \ 1298 \ 1299 product(intx, BiasedLockingStartupDelay, 0, \ 1300 "Number of milliseconds to wait before enabling biased locking") \ 1301 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1302 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1303 \ 1304 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1305 "Print statistics of biased locking in JVM") \ 1306 \ 1307 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1308 "Threshold of number of revocations per type to try to " \ 1309 "rebias all objects in the heap of that type") \ 1310 range(0, max_intx) \ 1311 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1312 \ 1313 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1314 "Threshold of number of revocations per type to permanently " \ 1315 "revoke biases of all objects in the heap of that type") \ 1316 range(0, max_intx) \ 1317 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1318 \ 1319 product(intx, BiasedLockingDecayTime, 25000, \ 1320 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1321 "type after previous bulk rebias") \ 1322 range(500, max_intx) \ 1323 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1324 \ 1325 product(bool, ExitOnOutOfMemoryError, false, \ 1326 "JVM exits on the first occurrence of an out-of-memory error") \ 1327 \ 1328 product(bool, CrashOnOutOfMemoryError, false, \ 1329 "JVM aborts, producing an error log and core/mini dump, on the " \ 1330 "first occurrence of an out-of-memory error") \ 1331 \ 1332 /* tracing */ \ 1333 \ 1334 develop(bool, StressRewriter, false, \ 1335 "Stress linktime bytecode rewriting") \ 1336 \ 1337 product(ccstr, TraceJVMTI, NULL, \ 1338 "Trace flags for JVMTI functions and events") \ 1339 \ 1340 /* This option can change an EMCP method into an obsolete method. */ \ 1341 /* This can affect tests that except specific methods to be EMCP. */ \ 1342 /* This option should be used with caution. */ \ 1343 product(bool, StressLdcRewrite, false, \ 1344 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1345 \ 1346 /* change to false by default sometime after Mustang */ \ 1347 product(bool, VerifyMergedCPBytecodes, true, \ 1348 "Verify bytecodes after RedefineClasses constant pool merging") \ 1349 \ 1350 develop(bool, TraceBytecodes, false, \ 1351 "Trace bytecode execution") \ 1352 \ 1353 develop(bool, TraceICs, false, \ 1354 "Trace inline cache changes") \ 1355 \ 1356 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1357 "Trace method invocation counter overflow") \ 1358 \ 1359 develop(bool, TraceInlineCacheClearing, false, \ 1360 "Trace clearing of inline caches in nmethods") \ 1361 \ 1362 develop(bool, TraceDependencies, false, \ 1363 "Trace dependencies") \ 1364 \ 1365 develop(bool, VerifyDependencies, trueInDebug, \ 1366 "Exercise and verify the compilation dependency mechanism") \ 1367 \ 1368 develop(bool, TraceNewOopMapGeneration, false, \ 1369 "Trace OopMapGeneration") \ 1370 \ 1371 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1372 "Trace OopMapGeneration: print detailed cell states") \ 1373 \ 1374 develop(bool, TimeOopMap, false, \ 1375 "Time calls to GenerateOopMap::compute_map() in sum") \ 1376 \ 1377 develop(bool, TimeOopMap2, false, \ 1378 "Time calls to GenerateOopMap::compute_map() individually") \ 1379 \ 1380 develop(bool, TraceOopMapRewrites, false, \ 1381 "Trace rewriting of method oops during oop map generation") \ 1382 \ 1383 develop(bool, TraceICBuffer, false, \ 1384 "Trace usage of IC buffer") \ 1385 \ 1386 develop(bool, TraceCompiledIC, false, \ 1387 "Trace changes of compiled IC") \ 1388 \ 1389 develop(bool, FLSVerifyDictionary, false, \ 1390 "Do lots of (expensive) FLS dictionary verification") \ 1391 \ 1392 \ 1393 notproduct(bool, CheckMemoryInitialization, false, \ 1394 "Check memory initialization") \ 1395 \ 1396 product(uintx, ProcessDistributionStride, 4, \ 1397 "Stride through processors when distributing processes") \ 1398 range(0, max_juint) \ 1399 \ 1400 develop(bool, TraceFinalizerRegistration, false, \ 1401 "Trace registration of final references") \ 1402 \ 1403 notproduct(bool, TraceScavenge, false, \ 1404 "Trace scavenge") \ 1405 \ 1406 product(bool, IgnoreEmptyClassPaths, false, \ 1407 "Ignore empty path elements in -classpath") \ 1408 \ 1409 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 1410 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 1411 "Initial size of the boot class loader data metaspace") \ 1412 range(30*K, max_uintx/BytesPerWord) \ 1413 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 1414 \ 1415 product(bool, PrintHeapAtSIGBREAK, true, \ 1416 "Print heap layout in response to SIGBREAK") \ 1417 \ 1418 manageable(bool, PrintClassHistogram, false, \ 1419 "Print a histogram of class instances") \ 1420 \ 1421 develop(bool, IgnoreLibthreadGPFault, false, \ 1422 "Suppress workaround for libthread GP fault") \ 1423 \ 1424 experimental(double, ObjectCountCutOffPercent, 0.5, \ 1425 "The percentage of the used heap that the instances of a class " \ 1426 "must occupy for the class to generate a trace event") \ 1427 range(0.0, 100.0) \ 1428 \ 1429 /* JVMTI heap profiling */ \ 1430 \ 1431 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 1432 "Trace JVMTI object tagging calls") \ 1433 \ 1434 diagnostic(bool, VerifyBeforeIteration, false, \ 1435 "Verify memory system before JVMTI iteration") \ 1436 \ 1437 /* compiler interface */ \ 1438 \ 1439 develop(bool, CIPrintCompilerName, false, \ 1440 "when CIPrint is active, print the name of the active compiler") \ 1441 \ 1442 diagnostic(bool, CIPrintCompileQueue, false, \ 1443 "display the contents of the compile queue whenever a " \ 1444 "compilation is enqueued") \ 1445 \ 1446 develop(bool, CIPrintRequests, false, \ 1447 "display every request for compilation") \ 1448 \ 1449 product(bool, CITime, false, \ 1450 "collect timing information for compilation") \ 1451 \ 1452 develop(bool, CITimeVerbose, false, \ 1453 "be more verbose in compilation timings") \ 1454 \ 1455 develop(bool, CITimeEach, false, \ 1456 "display timing information after each successful compilation") \ 1457 \ 1458 develop(bool, CICountOSR, false, \ 1459 "use a separate counter when assigning ids to osr compilations") \ 1460 \ 1461 develop(bool, CICompileNatives, true, \ 1462 "compile native methods if supported by the compiler") \ 1463 \ 1464 develop_pd(bool, CICompileOSR, \ 1465 "compile on stack replacement methods if supported by the " \ 1466 "compiler") \ 1467 \ 1468 develop(bool, CIPrintMethodCodes, false, \ 1469 "print method bytecodes of the compiled code") \ 1470 \ 1471 develop(bool, CIPrintTypeFlow, false, \ 1472 "print the results of ciTypeFlow analysis") \ 1473 \ 1474 develop(bool, CITraceTypeFlow, false, \ 1475 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1476 \ 1477 develop(intx, OSROnlyBCI, -1, \ 1478 "OSR only at this bci. Negative values mean exclude that bci") \ 1479 \ 1480 /* compiler */ \ 1481 \ 1482 /* notice: the max range value here is max_jint, not max_intx */ \ 1483 /* because of overflow issue */ \ 1484 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1485 "Number of compiler threads to run") \ 1486 range(0, max_jint) \ 1487 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1488 \ 1489 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1490 "Dynamically choose the number of parallel compiler threads") \ 1491 \ 1492 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1493 "Reduce the number of parallel compiler threads when they " \ 1494 "are not used") \ 1495 \ 1496 diagnostic(bool, TraceCompilerThreads, false, \ 1497 "Trace creation and removal of compiler threads") \ 1498 \ 1499 develop(bool, InjectCompilerCreationFailure, false, \ 1500 "Inject thread creation failures for " \ 1501 "UseDynamicNumberOfCompilerThreads") \ 1502 \ 1503 product(intx, CompilationPolicyChoice, 0, \ 1504 "which compilation policy (0-3)") \ 1505 range(0, 3) \ 1506 \ 1507 develop(bool, UseStackBanging, true, \ 1508 "use stack banging for stack overflow checks (required for " \ 1509 "proper StackOverflow handling; disable only to measure cost " \ 1510 "of stackbanging)") \ 1511 \ 1512 develop(bool, UseStrictFP, true, \ 1513 "use strict fp if modifier strictfp is set") \ 1514 \ 1515 develop(bool, GenerateSynchronizationCode, true, \ 1516 "generate locking/unlocking code for synchronized methods and " \ 1517 "monitors") \ 1518 \ 1519 develop(bool, GenerateRangeChecks, true, \ 1520 "Generate range checks for array accesses") \ 1521 \ 1522 diagnostic_pd(bool, ImplicitNullChecks, \ 1523 "Generate code for implicit null checks") \ 1524 \ 1525 product_pd(bool, TrapBasedNullChecks, \ 1526 "Generate code for null checks that uses a cmp and trap " \ 1527 "instruction raising SIGTRAP. This is only used if an access to" \ 1528 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1529 "ImplicitNullChecks don't work (PPC64).") \ 1530 \ 1531 product(bool, PrintSafepointStatistics, false, \ 1532 "(Deprecated) Print statistics about safepoint synchronization") \ 1533 \ 1534 product(intx, PrintSafepointStatisticsCount, 300, \ 1535 "(Deprecated) Total number of safepoint statistics collected " \ 1536 "before printing them out") \ 1537 range(1, max_intx) \ 1538 \ 1539 product(intx, PrintSafepointStatisticsTimeout, -1, \ 1540 "(Deprecated) Print safepoint statistics only when safepoint takes " \ 1541 "more than PrintSafepointSatisticsTimeout in millis") \ 1542 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 1543 NOT_LP64(range(-1, max_intx)) \ 1544 \ 1545 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1546 "Enable Thread SMR extra validity checks") \ 1547 \ 1548 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1549 "Enable Thread SMR Statistics") \ 1550 \ 1551 product(bool, Inline, true, \ 1552 "Enable inlining") \ 1553 \ 1554 product(bool, ClipInlining, true, \ 1555 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1556 \ 1557 develop(bool, UseCHA, true, \ 1558 "Enable CHA") \ 1559 \ 1560 product(bool, UseTypeProfile, true, \ 1561 "Check interpreter profile for historically monomorphic calls") \ 1562 \ 1563 diagnostic(bool, PrintInlining, false, \ 1564 "Print inlining optimizations") \ 1565 \ 1566 product(bool, UsePopCountInstruction, false, \ 1567 "Use population count instruction") \ 1568 \ 1569 develop(bool, EagerInitialization, false, \ 1570 "Eagerly initialize classes if possible") \ 1571 \ 1572 diagnostic(bool, LogTouchedMethods, false, \ 1573 "Log methods which have been ever touched in runtime") \ 1574 \ 1575 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1576 "Print all methods that have been ever touched in runtime") \ 1577 \ 1578 develop(bool, TraceMethodReplacement, false, \ 1579 "Print when methods are replaced do to recompilation") \ 1580 \ 1581 develop(bool, PrintMethodFlushing, false, \ 1582 "Print the nmethods being flushed") \ 1583 \ 1584 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1585 "print statistics about method flushing") \ 1586 \ 1587 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1588 "Number of compiled code invocations after which " \ 1589 "the method is considered as hot by the flusher") \ 1590 range(1, max_jint) \ 1591 \ 1592 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1593 "Minimum number of sweeper passes before an nmethod " \ 1594 "can be flushed") \ 1595 range(0, max_intx) \ 1596 \ 1597 product(bool, UseCodeAging, true, \ 1598 "Insert counter to detect warm methods") \ 1599 \ 1600 diagnostic(bool, StressCodeAging, false, \ 1601 "Start with counters compiled in") \ 1602 \ 1603 develop(bool, StressCodeBuffers, false, \ 1604 "Exercise code buffer expansion and other rare state changes") \ 1605 \ 1606 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1607 "Generate extra debugging information for non-safepoints in " \ 1608 "nmethods") \ 1609 \ 1610 product(bool, PrintVMOptions, false, \ 1611 "Print flags that appeared on the command line") \ 1612 \ 1613 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1614 "Ignore unrecognized VM options") \ 1615 \ 1616 product(bool, PrintCommandLineFlags, false, \ 1617 "Print flags specified on command line or set by ergonomics") \ 1618 \ 1619 product(bool, PrintFlagsInitial, false, \ 1620 "Print all VM flags before argument processing and exit VM") \ 1621 \ 1622 product(bool, PrintFlagsFinal, false, \ 1623 "Print all VM flags after argument and ergonomic processing") \ 1624 \ 1625 notproduct(bool, PrintFlagsWithComments, false, \ 1626 "Print all VM flags with default values and descriptions and " \ 1627 "exit") \ 1628 \ 1629 product(bool, PrintFlagsRanges, false, \ 1630 "Print VM flags and their ranges and exit VM") \ 1631 \ 1632 diagnostic(bool, SerializeVMOutput, true, \ 1633 "Use a mutex to serialize output to tty and LogFile") \ 1634 \ 1635 diagnostic(bool, DisplayVMOutput, true, \ 1636 "Display all VM output on the tty, independently of LogVMOutput") \ 1637 \ 1638 diagnostic(bool, LogVMOutput, false, \ 1639 "Save VM output to LogFile") \ 1640 \ 1641 diagnostic(ccstr, LogFile, NULL, \ 1642 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1643 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1644 \ 1645 product(ccstr, ErrorFile, NULL, \ 1646 "If an error occurs, save the error data to this file " \ 1647 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1648 \ 1649 product(bool, DisplayVMOutputToStderr, false, \ 1650 "If DisplayVMOutput is true, display all VM output to stderr") \ 1651 \ 1652 product(bool, DisplayVMOutputToStdout, false, \ 1653 "If DisplayVMOutput is true, display all VM output to stdout") \ 1654 \ 1655 product(bool, UseHeavyMonitors, false, \ 1656 "use heavyweight instead of lightweight Java monitors") \ 1657 \ 1658 product(bool, PrintStringTableStatistics, false, \ 1659 "print statistics about the StringTable and SymbolTable") \ 1660 \ 1661 diagnostic(bool, VerifyStringTableAtExit, false, \ 1662 "verify StringTable contents at exit") \ 1663 \ 1664 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1665 "print histogram of the symbol table") \ 1666 \ 1667 notproduct(bool, ExitVMOnVerifyError, false, \ 1668 "standard exit from VM if bytecode verify error " \ 1669 "(only in debug mode)") \ 1670 \ 1671 diagnostic(ccstr, AbortVMOnException, NULL, \ 1672 "Call fatal if this exception is thrown. Example: " \ 1673 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1674 \ 1675 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1676 "Call fatal if the exception pointed by AbortVMOnException " \ 1677 "has this message") \ 1678 \ 1679 develop(bool, DebugVtables, false, \ 1680 "add debugging code to vtable dispatch") \ 1681 \ 1682 notproduct(bool, PrintVtableStats, false, \ 1683 "print vtables stats at end of run") \ 1684 \ 1685 develop(bool, TraceCreateZombies, false, \ 1686 "trace creation of zombie nmethods") \ 1687 \ 1688 notproduct(bool, IgnoreLockingAssertions, false, \ 1689 "disable locking assertions (for speed)") \ 1690 \ 1691 product(bool, RangeCheckElimination, true, \ 1692 "Eliminate range checks") \ 1693 \ 1694 develop_pd(bool, UncommonNullCast, \ 1695 "track occurrences of null in casts; adjust compiler tactics") \ 1696 \ 1697 develop(bool, TypeProfileCasts, true, \ 1698 "treat casts like calls for purposes of type profiling") \ 1699 \ 1700 develop(bool, DelayCompilationDuringStartup, true, \ 1701 "Delay invoking the compiler until main application class is " \ 1702 "loaded") \ 1703 \ 1704 develop(bool, CompileTheWorld, false, \ 1705 "Compile all methods in all classes in bootstrap class path " \ 1706 "(stress test)") \ 1707 \ 1708 develop(bool, CompileTheWorldPreloadClasses, true, \ 1709 "Preload all classes used by a class before start loading") \ 1710 \ 1711 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 1712 "Force a safepoint every n compiles so sweeper can keep up") \ 1713 \ 1714 develop(bool, FillDelaySlots, true, \ 1715 "Fill delay slots (on SPARC only)") \ 1716 \ 1717 develop(bool, TimeLivenessAnalysis, false, \ 1718 "Time computation of bytecode liveness analysis") \ 1719 \ 1720 develop(bool, TraceLivenessGen, false, \ 1721 "Trace the generation of liveness analysis information") \ 1722 \ 1723 notproduct(bool, TraceLivenessQuery, false, \ 1724 "Trace queries of liveness analysis information") \ 1725 \ 1726 notproduct(bool, CollectIndexSetStatistics, false, \ 1727 "Collect information about IndexSets") \ 1728 \ 1729 develop(bool, UseLoopSafepoints, true, \ 1730 "Generate Safepoint nodes in every loop") \ 1731 \ 1732 develop(intx, FastAllocateSizeLimit, 128*K, \ 1733 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1734 "Inline allocations larger than this in doublewords must go slow")\ 1735 \ 1736 product(bool, AggressiveOpts, false, \ 1737 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \ 1738 \ 1739 product_pd(bool, CompactStrings, \ 1740 "Enable Strings to use single byte chars in backing store") \ 1741 \ 1742 product_pd(uintx, TypeProfileLevel, \ 1743 "=XYZ, with Z: Type profiling of arguments at call; " \ 1744 "Y: Type profiling of return value at call; " \ 1745 "X: Type profiling of parameters to methods; " \ 1746 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1747 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1748 \ 1749 product(intx, TypeProfileArgsLimit, 2, \ 1750 "max number of call arguments to consider for type profiling") \ 1751 range(0, 16) \ 1752 \ 1753 product(intx, TypeProfileParmsLimit, 2, \ 1754 "max number of incoming parameters to consider for type profiling"\ 1755 ", -1 for all") \ 1756 range(-1, 64) \ 1757 \ 1758 /* statistics */ \ 1759 develop(bool, CountCompiledCalls, false, \ 1760 "Count method invocations") \ 1761 \ 1762 notproduct(bool, CountRuntimeCalls, false, \ 1763 "Count VM runtime calls") \ 1764 \ 1765 develop(bool, CountJNICalls, false, \ 1766 "Count jni method invocations") \ 1767 \ 1768 notproduct(bool, CountJVMCalls, false, \ 1769 "Count jvm method invocations") \ 1770 \ 1771 notproduct(bool, CountRemovableExceptions, false, \ 1772 "Count exceptions that could be replaced by branches due to " \ 1773 "inlining") \ 1774 \ 1775 notproduct(bool, ICMissHistogram, false, \ 1776 "Produce histogram of IC misses") \ 1777 \ 1778 /* interpreter */ \ 1779 product_pd(bool, RewriteBytecodes, \ 1780 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1781 \ 1782 product_pd(bool, RewriteFrequentPairs, \ 1783 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1784 \ 1785 diagnostic(bool, PrintInterpreter, false, \ 1786 "Print the generated interpreter code") \ 1787 \ 1788 product(bool, UseInterpreter, true, \ 1789 "Use interpreter for non-compiled methods") \ 1790 \ 1791 develop(bool, UseFastSignatureHandlers, true, \ 1792 "Use fast signature handlers for native calls") \ 1793 \ 1794 product(bool, UseLoopCounter, true, \ 1795 "Increment invocation counter on backward branch") \ 1796 \ 1797 product_pd(bool, UseOnStackReplacement, \ 1798 "Use on stack replacement, calls runtime if invoc. counter " \ 1799 "overflows in loop") \ 1800 \ 1801 notproduct(bool, TraceOnStackReplacement, false, \ 1802 "Trace on stack replacement") \ 1803 \ 1804 product_pd(bool, PreferInterpreterNativeStubs, \ 1805 "Use always interpreter stubs for native methods invoked via " \ 1806 "interpreter") \ 1807 \ 1808 develop(bool, CountBytecodes, false, \ 1809 "Count number of bytecodes executed") \ 1810 \ 1811 develop(bool, PrintBytecodeHistogram, false, \ 1812 "Print histogram of the executed bytecodes") \ 1813 \ 1814 develop(bool, PrintBytecodePairHistogram, false, \ 1815 "Print histogram of the executed bytecode pairs") \ 1816 \ 1817 diagnostic(bool, PrintSignatureHandlers, false, \ 1818 "Print code generated for native method signature handlers") \ 1819 \ 1820 develop(bool, VerifyOops, false, \ 1821 "Do plausibility checks for oops") \ 1822 \ 1823 develop(bool, CheckUnhandledOops, false, \ 1824 "Check for unhandled oops in VM code") \ 1825 \ 1826 develop(bool, VerifyJNIFields, trueInDebug, \ 1827 "Verify jfieldIDs for instance fields") \ 1828 \ 1829 notproduct(bool, VerifyJNIEnvThread, false, \ 1830 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1831 "from JNI") \ 1832 \ 1833 develop(bool, VerifyFPU, false, \ 1834 "Verify FPU state (check for NaN's, etc.)") \ 1835 \ 1836 develop(bool, VerifyThread, false, \ 1837 "Watch the thread register for corruption (SPARC only)") \ 1838 \ 1839 develop(bool, VerifyActivationFrameSize, false, \ 1840 "Verify that activation frame didn't become smaller than its " \ 1841 "minimal size") \ 1842 \ 1843 develop(bool, TraceFrequencyInlining, false, \ 1844 "Trace frequency based inlining") \ 1845 \ 1846 develop_pd(bool, InlineIntrinsics, \ 1847 "Inline intrinsics that can be statically resolved") \ 1848 \ 1849 product_pd(bool, ProfileInterpreter, \ 1850 "Profile at the bytecode level during interpretation") \ 1851 \ 1852 develop(bool, TraceProfileInterpreter, false, \ 1853 "Trace profiling at the bytecode level during interpretation. " \ 1854 "This outputs the profiling information collected to improve " \ 1855 "jit compilation.") \ 1856 \ 1857 develop_pd(bool, ProfileTraps, \ 1858 "Profile deoptimization traps at the bytecode level") \ 1859 \ 1860 product(intx, ProfileMaturityPercentage, 20, \ 1861 "number of method invocations/branches (expressed as % of " \ 1862 "CompileThreshold) before using the method's profile") \ 1863 range(0, 100) \ 1864 \ 1865 diagnostic(bool, PrintMethodData, false, \ 1866 "Print the results of +ProfileInterpreter at end of run") \ 1867 \ 1868 develop(bool, VerifyDataPointer, trueInDebug, \ 1869 "Verify the method data pointer during interpreter profiling") \ 1870 \ 1871 develop(bool, VerifyCompiledCode, false, \ 1872 "Include miscellaneous runtime verifications in nmethod code; " \ 1873 "default off because it disturbs nmethod size heuristics") \ 1874 \ 1875 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1876 "Manually make GC thread crash then dump java stack trace; " \ 1877 "Test only") \ 1878 \ 1879 /* compilation */ \ 1880 product(bool, UseCompiler, true, \ 1881 "Use Just-In-Time compilation") \ 1882 \ 1883 develop(bool, TraceCompilationPolicy, false, \ 1884 "Trace compilation policy") \ 1885 \ 1886 develop(bool, TimeCompilationPolicy, false, \ 1887 "Time the compilation policy") \ 1888 \ 1889 product(bool, UseCounterDecay, true, \ 1890 "Adjust recompilation counters") \ 1891 \ 1892 develop(intx, CounterHalfLifeTime, 30, \ 1893 "Half-life time of invocation counters (in seconds)") \ 1894 \ 1895 develop(intx, CounterDecayMinIntervalLength, 500, \ 1896 "The minimum interval (in milliseconds) between invocation of " \ 1897 "CounterDecay") \ 1898 \ 1899 product(bool, AlwaysCompileLoopMethods, false, \ 1900 "When using recompilation, never interpret methods " \ 1901 "containing loops") \ 1902 \ 1903 product(bool, DontCompileHugeMethods, true, \ 1904 "Do not compile methods > HugeMethodLimit") \ 1905 \ 1906 /* Bytecode escape analysis estimation. */ \ 1907 product(bool, EstimateArgEscape, true, \ 1908 "Analyze bytecodes to estimate escape state of arguments") \ 1909 \ 1910 product(intx, BCEATraceLevel, 0, \ 1911 "How much tracing to do of bytecode escape analysis estimates " \ 1912 "(0-3)") \ 1913 range(0, 3) \ 1914 \ 1915 product(intx, MaxBCEAEstimateLevel, 5, \ 1916 "Maximum number of nested calls that are analyzed by BC EA") \ 1917 range(0, max_jint) \ 1918 \ 1919 product(intx, MaxBCEAEstimateSize, 150, \ 1920 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1921 range(0, max_jint) \ 1922 \ 1923 product(intx, AllocatePrefetchStyle, 1, \ 1924 "0 = no prefetch, " \ 1925 "1 = generate prefetch instructions for each allocation, " \ 1926 "2 = use TLAB watermark to gate allocation prefetch, " \ 1927 "3 = generate one prefetch instruction per cache line") \ 1928 range(0, 3) \ 1929 \ 1930 product(intx, AllocatePrefetchDistance, -1, \ 1931 "Distance to prefetch ahead of allocation pointer. " \ 1932 "-1: use system-specific value (automatically determined") \ 1933 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1934 \ 1935 product(intx, AllocatePrefetchLines, 3, \ 1936 "Number of lines to prefetch ahead of array allocation pointer") \ 1937 range(1, 64) \ 1938 \ 1939 product(intx, AllocateInstancePrefetchLines, 1, \ 1940 "Number of lines to prefetch ahead of instance allocation " \ 1941 "pointer") \ 1942 range(1, 64) \ 1943 \ 1944 product(intx, AllocatePrefetchStepSize, 16, \ 1945 "Step size in bytes of sequential prefetch instructions") \ 1946 range(1, 512) \ 1947 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1948 \ 1949 product(intx, AllocatePrefetchInstr, 0, \ 1950 "Select instruction to prefetch ahead of allocation pointer") \ 1951 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1952 \ 1953 /* deoptimization */ \ 1954 develop(bool, TraceDeoptimization, false, \ 1955 "Trace deoptimization") \ 1956 \ 1957 develop(bool, PrintDeoptimizationDetails, false, \ 1958 "Print more information about deoptimization") \ 1959 \ 1960 develop(bool, DebugDeoptimization, false, \ 1961 "Tracing various information while debugging deoptimization") \ 1962 \ 1963 product(intx, SelfDestructTimer, 0, \ 1964 "Will cause VM to terminate after a given time (in minutes) " \ 1965 "(0 means off)") \ 1966 range(0, max_intx) \ 1967 \ 1968 product(intx, MaxJavaStackTraceDepth, 1024, \ 1969 "The maximum number of lines in the stack trace for Java " \ 1970 "exceptions (0 means all)") \ 1971 range(0, max_jint/2) \ 1972 \ 1973 /* notice: the max range value here is max_jint, not max_intx */ \ 1974 /* because of overflow issue */ \ 1975 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1976 "Guarantee a safepoint (at least) every so many milliseconds " \ 1977 "(0 means none)") \ 1978 range(0, max_jint) \ 1979 \ 1980 product(intx, SafepointTimeoutDelay, 10000, \ 1981 "Delay in milliseconds for option SafepointTimeout") \ 1982 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1983 NOT_LP64(range(0, max_intx)) \ 1984 \ 1985 product(intx, NmethodSweepActivity, 10, \ 1986 "Removes cold nmethods from code cache if > 0. Higher values " \ 1987 "result in more aggressive sweeping") \ 1988 range(0, 2000) \ 1989 \ 1990 notproduct(bool, LogSweeper, false, \ 1991 "Keep a ring buffer of sweeper activity") \ 1992 \ 1993 notproduct(intx, SweeperLogEntries, 1024, \ 1994 "Number of records in the ring buffer of sweeper activity") \ 1995 \ 1996 notproduct(intx, MemProfilingInterval, 500, \ 1997 "Time between each invocation of the MemProfiler") \ 1998 \ 1999 develop(intx, MallocCatchPtr, -1, \ 2000 "Hit breakpoint when mallocing/freeing this pointer") \ 2001 \ 2002 notproduct(ccstrlist, SuppressErrorAt, "", \ 2003 "List of assertions (file:line) to muzzle") \ 2004 \ 2005 develop(intx, StackPrintLimit, 100, \ 2006 "number of stack frames to print in VM-level stack dump") \ 2007 \ 2008 notproduct(intx, MaxElementPrintSize, 256, \ 2009 "maximum number of elements to print") \ 2010 \ 2011 notproduct(intx, MaxSubklassPrintSize, 4, \ 2012 "maximum number of subklasses to print when printing klass") \ 2013 \ 2014 product(intx, MaxInlineLevel, 9, \ 2015 "maximum number of nested calls that are inlined") \ 2016 range(0, max_jint) \ 2017 \ 2018 product(intx, MaxRecursiveInlineLevel, 1, \ 2019 "maximum number of nested recursive calls that are inlined") \ 2020 range(0, max_jint) \ 2021 \ 2022 develop(intx, MaxForceInlineLevel, 100, \ 2023 "maximum number of nested calls that are forced for inlining " \ 2024 "(using CompileCommand or marked w/ @ForceInline)") \ 2025 range(0, max_jint) \ 2026 \ 2027 product_pd(intx, InlineSmallCode, \ 2028 "Only inline already compiled methods if their code size is " \ 2029 "less than this") \ 2030 range(0, max_jint) \ 2031 \ 2032 product(intx, MaxInlineSize, 35, \ 2033 "The maximum bytecode size of a method to be inlined") \ 2034 range(0, max_jint) \ 2035 \ 2036 product_pd(intx, FreqInlineSize, \ 2037 "The maximum bytecode size of a frequent method to be inlined") \ 2038 range(0, max_jint) \ 2039 \ 2040 product(intx, MaxTrivialSize, 6, \ 2041 "The maximum bytecode size of a trivial method to be inlined") \ 2042 range(0, max_jint) \ 2043 \ 2044 product(intx, MinInliningThreshold, 250, \ 2045 "The minimum invocation count a method needs to have to be " \ 2046 "inlined") \ 2047 range(0, max_jint) \ 2048 \ 2049 develop(intx, MethodHistogramCutoff, 100, \ 2050 "The cutoff value for method invocation histogram (+CountCalls)") \ 2051 \ 2052 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2053 "Number of interpreted methods to show in profile") \ 2054 \ 2055 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2056 "Number of compiled methods to show in profile") \ 2057 \ 2058 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2059 "Number of stub methods to show in profile") \ 2060 \ 2061 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2062 "Number of runtime stub nodes to show in profile") \ 2063 \ 2064 product(intx, ProfileIntervalsTicks, 100, \ 2065 "Number of ticks between printing of interval profile " \ 2066 "(+ProfileIntervals)") \ 2067 range(0, max_intx) \ 2068 \ 2069 develop(intx, DontYieldALotInterval, 10, \ 2070 "Interval between which yields will be dropped (milliseconds)") \ 2071 \ 2072 develop(intx, ProfilerPCTickThreshold, 15, \ 2073 "Number of ticks in a PC buckets to be a hotspot") \ 2074 \ 2075 notproduct(intx, DeoptimizeALotInterval, 5, \ 2076 "Number of exits until DeoptimizeALot kicks in") \ 2077 \ 2078 notproduct(intx, ZombieALotInterval, 5, \ 2079 "Number of exits until ZombieALot kicks in") \ 2080 \ 2081 diagnostic(uintx, MallocMaxTestWords, 0, \ 2082 "If non-zero, maximum number of words that malloc/realloc can " \ 2083 "allocate (for testing only)") \ 2084 range(0, max_uintx) \ 2085 \ 2086 product(intx, TypeProfileWidth, 2, \ 2087 "Number of receiver types to record in call/cast profile") \ 2088 range(0, 8) \ 2089 \ 2090 develop(intx, BciProfileWidth, 2, \ 2091 "Number of return bci's to record in ret profile") \ 2092 \ 2093 product(intx, PerMethodRecompilationCutoff, 400, \ 2094 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2095 range(-1, max_intx) \ 2096 \ 2097 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2098 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2099 range(-1, max_intx) \ 2100 \ 2101 product(intx, PerMethodTrapLimit, 100, \ 2102 "Limit on traps (of one kind) in a method (includes inlines)") \ 2103 range(0, max_jint) \ 2104 \ 2105 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 2106 "Limit on speculative traps (of one kind) in a method " \ 2107 "(includes inlines)") \ 2108 range(0, max_jint) \ 2109 \ 2110 product(intx, PerBytecodeTrapLimit, 4, \ 2111 "Limit on traps (of one kind) at a particular BCI") \ 2112 range(0, max_jint) \ 2113 \ 2114 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 2115 "Extra method data trap entries for speculation") \ 2116 \ 2117 develop(intx, InlineFrequencyRatio, 20, \ 2118 "Ratio of call site execution to caller method invocation") \ 2119 range(0, max_jint) \ 2120 \ 2121 diagnostic_pd(intx, InlineFrequencyCount, \ 2122 "Count of call site execution necessary to trigger frequent " \ 2123 "inlining") \ 2124 range(0, max_jint) \ 2125 \ 2126 develop(intx, InlineThrowCount, 50, \ 2127 "Force inlining of interpreted methods that throw this often") \ 2128 range(0, max_jint) \ 2129 \ 2130 develop(intx, InlineThrowMaxSize, 200, \ 2131 "Force inlining of throwing methods smaller than this") \ 2132 range(0, max_jint) \ 2133 \ 2134 develop(intx, ProfilerNodeSize, 1024, \ 2135 "Size in K to allocate for the Profile Nodes of each thread") \ 2136 range(0, 1024) \ 2137 \ 2138 product_pd(size_t, MetaspaceSize, \ 2139 "Initial threshold (in bytes) at which a garbage collection " \ 2140 "is done to reduce Metaspace usage") \ 2141 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 2142 \ 2143 product(size_t, MaxMetaspaceSize, max_uintx, \ 2144 "Maximum size of Metaspaces (in bytes)") \ 2145 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 2146 \ 2147 product(size_t, CompressedClassSpaceSize, 1*G, \ 2148 "Maximum size of class area in Metaspace when compressed " \ 2149 "class pointers are used") \ 2150 range(1*M, 3*G) \ 2151 \ 2152 manageable(uintx, MinHeapFreeRatio, 40, \ 2153 "The minimum percentage of heap free after GC to avoid expansion."\ 2154 " For most GCs this applies to the old generation. In G1 and" \ 2155 " ParallelGC it applies to the whole heap.") \ 2156 range(0, 100) \ 2157 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 2158 \ 2159 manageable(uintx, MaxHeapFreeRatio, 70, \ 2160 "The maximum percentage of heap free after GC to avoid shrinking."\ 2161 " For most GCs this applies to the old generation. In G1 and" \ 2162 " ParallelGC it applies to the whole heap.") \ 2163 range(0, 100) \ 2164 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 2165 \ 2166 product(bool, ShrinkHeapInSteps, true, \ 2167 "When disabled, informs the GC to shrink the java heap directly" \ 2168 " to the target size at the next full GC rather than requiring" \ 2169 " smaller steps during multiple full GCs.") \ 2170 \ 2171 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2172 "Number of milliseconds per MB of free space in the heap") \ 2173 range(0, max_intx) \ 2174 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 2175 \ 2176 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2177 "The minimum change in heap space due to GC (in bytes)") \ 2178 range(0, max_uintx) \ 2179 \ 2180 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 2181 "The minimum expansion of Metaspace (in bytes)") \ 2182 range(0, max_uintx) \ 2183 \ 2184 product(uintx, MaxMetaspaceFreeRatio, 70, \ 2185 "The maximum percentage of Metaspace free after GC to avoid " \ 2186 "shrinking") \ 2187 range(0, 100) \ 2188 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 2189 \ 2190 product(uintx, MinMetaspaceFreeRatio, 40, \ 2191 "The minimum percentage of Metaspace free after GC to avoid " \ 2192 "expansion") \ 2193 range(0, 99) \ 2194 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 2195 \ 2196 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 2197 "The maximum expansion of Metaspace without full GC (in bytes)") \ 2198 range(0, max_uintx) \ 2199 \ 2200 /* stack parameters */ \ 2201 product_pd(intx, StackYellowPages, \ 2202 "Number of yellow zone (recoverable overflows) pages of size " \ 2203 "4KB. If pages are bigger yellow zone is aligned up.") \ 2204 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 2205 \ 2206 product_pd(intx, StackRedPages, \ 2207 "Number of red zone (unrecoverable overflows) pages of size " \ 2208 "4KB. If pages are bigger red zone is aligned up.") \ 2209 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 2210 \ 2211 product_pd(intx, StackReservedPages, \ 2212 "Number of reserved zone (reserved to annotated methods) pages" \ 2213 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 2214 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 2215 \ 2216 product(bool, RestrictReservedStack, true, \ 2217 "Restrict @ReservedStackAccess to trusted classes") \ 2218 \ 2219 /* greater stack shadow pages can't generate instruction to bang stack */ \ 2220 product_pd(intx, StackShadowPages, \ 2221 "Number of shadow zone (for overflow checking) pages of size " \ 2222 "4KB. If pages are bigger shadow zone is aligned up. " \ 2223 "This should exceed the depth of the VM and native call stack.") \ 2224 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 2225 \ 2226 product_pd(intx, ThreadStackSize, \ 2227 "Thread Stack Size (in Kbytes)") \ 2228 range(0, 1 * M) \ 2229 \ 2230 product_pd(intx, VMThreadStackSize, \ 2231 "Non-Java Thread Stack Size (in Kbytes)") \ 2232 range(0, max_intx/(1 * K)) \ 2233 \ 2234 product_pd(intx, CompilerThreadStackSize, \ 2235 "Compiler Thread Stack Size (in Kbytes)") \ 2236 range(0, max_intx/(1 * K)) \ 2237 \ 2238 develop_pd(size_t, JVMInvokeMethodSlack, \ 2239 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2240 \ 2241 /* code cache parameters */ \ 2242 develop_pd(uintx, CodeCacheSegmentSize, \ 2243 "Code cache segment size (in bytes) - smallest unit of " \ 2244 "allocation") \ 2245 range(1, 1024) \ 2246 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 2247 \ 2248 develop_pd(intx, CodeEntryAlignment, \ 2249 "Code entry alignment for generated code (in bytes)") \ 2250 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 2251 \ 2252 product_pd(intx, OptoLoopAlignment, \ 2253 "Align inner loops to zero relative to this modulus") \ 2254 range(1, 16) \ 2255 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 2256 \ 2257 product_pd(uintx, InitialCodeCacheSize, \ 2258 "Initial code cache size (in bytes)") \ 2259 range(os::vm_page_size(), max_uintx) \ 2260 \ 2261 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 2262 "Minimum code cache size (in bytes) required to start VM.") \ 2263 range(0, max_uintx) \ 2264 \ 2265 product(bool, SegmentedCodeCache, false, \ 2266 "Use a segmented code cache") \ 2267 \ 2268 product_pd(uintx, ReservedCodeCacheSize, \ 2269 "Reserved code cache size (in bytes) - maximum code cache size") \ 2270 range(os::vm_page_size(), max_uintx) \ 2271 \ 2272 product_pd(uintx, NonProfiledCodeHeapSize, \ 2273 "Size of code heap with non-profiled methods (in bytes)") \ 2274 range(0, max_uintx) \ 2275 \ 2276 product_pd(uintx, ProfiledCodeHeapSize, \ 2277 "Size of code heap with profiled methods (in bytes)") \ 2278 range(0, max_uintx) \ 2279 \ 2280 product_pd(uintx, NonNMethodCodeHeapSize, \ 2281 "Size of code heap with non-nmethods (in bytes)") \ 2282 range(os::vm_page_size(), max_uintx) \ 2283 \ 2284 product_pd(uintx, CodeCacheExpansionSize, \ 2285 "Code cache expansion size (in bytes)") \ 2286 range(32*K, max_uintx) \ 2287 \ 2288 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 2289 "Minimum number of segments in a code cache block") \ 2290 range(1, 100) \ 2291 \ 2292 notproduct(bool, ExitOnFullCodeCache, false, \ 2293 "Exit the VM if we fill the code cache") \ 2294 \ 2295 product(bool, UseCodeCacheFlushing, true, \ 2296 "Remove cold/old nmethods from the code cache") \ 2297 \ 2298 product(uintx, StartAggressiveSweepingAt, 10, \ 2299 "Start aggressive sweeping if X[%] of the code cache is free." \ 2300 "Segmented code cache: X[%] of the non-profiled heap." \ 2301 "Non-segmented code cache: X[%] of the total code cache") \ 2302 range(0, 100) \ 2303 \ 2304 /* AOT parameters */ \ 2305 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 2306 "Use AOT compiled files") \ 2307 \ 2308 product(ccstrlist, AOTLibrary, NULL, \ 2309 "AOT library") \ 2310 \ 2311 product(bool, PrintAOT, false, \ 2312 "Print used AOT klasses and methods") \ 2313 \ 2314 notproduct(bool, PrintAOTStatistics, false, \ 2315 "Print AOT statistics") \ 2316 \ 2317 diagnostic(bool, UseAOTStrictLoading, false, \ 2318 "Exit the VM if any of the AOT libraries has invalid config") \ 2319 \ 2320 product(bool, CalculateClassFingerprint, false, \ 2321 "Calculate class fingerprint") \ 2322 \ 2323 /* interpreter debugging */ \ 2324 develop(intx, BinarySwitchThreshold, 5, \ 2325 "Minimal number of lookupswitch entries for rewriting to binary " \ 2326 "switch") \ 2327 \ 2328 develop(intx, StopInterpreterAt, 0, \ 2329 "Stop interpreter execution at specified bytecode number") \ 2330 \ 2331 develop(intx, TraceBytecodesAt, 0, \ 2332 "Trace bytecodes starting with specified bytecode number") \ 2333 \ 2334 /* compiler interface */ \ 2335 develop(intx, CIStart, 0, \ 2336 "The id of the first compilation to permit") \ 2337 \ 2338 develop(intx, CIStop, max_jint, \ 2339 "The id of the last compilation to permit") \ 2340 \ 2341 develop(intx, CIStartOSR, 0, \ 2342 "The id of the first osr compilation to permit " \ 2343 "(CICountOSR must be on)") \ 2344 \ 2345 develop(intx, CIStopOSR, max_jint, \ 2346 "The id of the last osr compilation to permit " \ 2347 "(CICountOSR must be on)") \ 2348 \ 2349 develop(intx, CIBreakAtOSR, -1, \ 2350 "The id of osr compilation to break at") \ 2351 \ 2352 develop(intx, CIBreakAt, -1, \ 2353 "The id of compilation to break at") \ 2354 \ 2355 product(ccstrlist, CompileOnly, "", \ 2356 "List of methods (pkg/class.name) to restrict compilation to") \ 2357 \ 2358 product(ccstr, CompileCommandFile, NULL, \ 2359 "Read compiler commands from this file [.hotspot_compiler]") \ 2360 \ 2361 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 2362 "Read compiler directives from this file") \ 2363 \ 2364 product(ccstrlist, CompileCommand, "", \ 2365 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 2366 \ 2367 develop(bool, ReplayCompiles, false, \ 2368 "Enable replay of compilations from ReplayDataFile") \ 2369 \ 2370 product(ccstr, ReplayDataFile, NULL, \ 2371 "File containing compilation replay information" \ 2372 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 2373 \ 2374 product(ccstr, InlineDataFile, NULL, \ 2375 "File containing inlining replay information" \ 2376 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 2377 \ 2378 develop(intx, ReplaySuppressInitializers, 2, \ 2379 "Control handling of class initialization during replay: " \ 2380 "0 - don't do anything special; " \ 2381 "1 - treat all class initializers as empty; " \ 2382 "2 - treat class initializers for application classes as empty; " \ 2383 "3 - allow all class initializers to run during bootstrap but " \ 2384 " pretend they are empty after starting replay") \ 2385 range(0, 3) \ 2386 \ 2387 develop(bool, ReplayIgnoreInitErrors, false, \ 2388 "Ignore exceptions thrown during initialization for replay") \ 2389 \ 2390 product(bool, DumpReplayDataOnError, true, \ 2391 "Record replay data for crashing compiler threads") \ 2392 \ 2393 product(bool, CICompilerCountPerCPU, false, \ 2394 "1 compiler thread for log(N CPUs)") \ 2395 \ 2396 develop(intx, CIFireOOMAt, -1, \ 2397 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 2398 "(non-negative value throws OOM after this many CI accesses " \ 2399 "in each compile)") \ 2400 notproduct(intx, CICrashAt, -1, \ 2401 "id of compilation to trigger assert in compiler thread for " \ 2402 "the purpose of testing, e.g. generation of replay data") \ 2403 notproduct(bool, CIObjectFactoryVerify, false, \ 2404 "enable potentially expensive verification in ciObjectFactory") \ 2405 \ 2406 /* Priorities */ \ 2407 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 2408 \ 2409 product(intx, ThreadPriorityPolicy, 0, \ 2410 "0 : Normal. "\ 2411 " VM chooses priorities that are appropriate for normal "\ 2412 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 2413 " to normal native priority. Java priorities below " \ 2414 " NORM_PRIORITY map to lower native priority values. On "\ 2415 " Windows applications are allowed to use higher native "\ 2416 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 2417 " not use the highest possible native priority, "\ 2418 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 2419 " system threads. On Linux thread priorities are ignored "\ 2420 " because the OS does not support static priority in "\ 2421 " SCHED_OTHER scheduling class which is the only choice for "\ 2422 " non-root, non-realtime applications. "\ 2423 "1 : Aggressive. "\ 2424 " Java thread priorities map over to the entire range of "\ 2425 " native thread priorities. Higher Java thread priorities map "\ 2426 " to higher native thread priorities. This policy should be "\ 2427 " used with care, as sometimes it can cause performance "\ 2428 " degradation in the application and/or the entire system. On "\ 2429 " Linux this policy requires root privilege.") \ 2430 range(0, 1) \ 2431 \ 2432 product(bool, ThreadPriorityVerbose, false, \ 2433 "Print priority changes") \ 2434 \ 2435 product(intx, CompilerThreadPriority, -1, \ 2436 "The native priority at which compiler threads should run " \ 2437 "(-1 means no change)") \ 2438 range(min_jint, max_jint) \ 2439 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 2440 \ 2441 product(intx, VMThreadPriority, -1, \ 2442 "The native priority at which the VM thread should run " \ 2443 "(-1 means no change)") \ 2444 range(-1, 127) \ 2445 \ 2446 product(bool, CompilerThreadHintNoPreempt, false, \ 2447 "(Solaris only) Give compiler threads an extra quanta") \ 2448 \ 2449 product(bool, VMThreadHintNoPreempt, false, \ 2450 "(Solaris only) Give VM thread an extra quanta") \ 2451 \ 2452 product(intx, JavaPriority1_To_OSPriority, -1, \ 2453 "Map Java priorities to OS priorities") \ 2454 range(-1, 127) \ 2455 \ 2456 product(intx, JavaPriority2_To_OSPriority, -1, \ 2457 "Map Java priorities to OS priorities") \ 2458 range(-1, 127) \ 2459 \ 2460 product(intx, JavaPriority3_To_OSPriority, -1, \ 2461 "Map Java priorities to OS priorities") \ 2462 range(-1, 127) \ 2463 \ 2464 product(intx, JavaPriority4_To_OSPriority, -1, \ 2465 "Map Java priorities to OS priorities") \ 2466 range(-1, 127) \ 2467 \ 2468 product(intx, JavaPriority5_To_OSPriority, -1, \ 2469 "Map Java priorities to OS priorities") \ 2470 range(-1, 127) \ 2471 \ 2472 product(intx, JavaPriority6_To_OSPriority, -1, \ 2473 "Map Java priorities to OS priorities") \ 2474 range(-1, 127) \ 2475 \ 2476 product(intx, JavaPriority7_To_OSPriority, -1, \ 2477 "Map Java priorities to OS priorities") \ 2478 range(-1, 127) \ 2479 \ 2480 product(intx, JavaPriority8_To_OSPriority, -1, \ 2481 "Map Java priorities to OS priorities") \ 2482 range(-1, 127) \ 2483 \ 2484 product(intx, JavaPriority9_To_OSPriority, -1, \ 2485 "Map Java priorities to OS priorities") \ 2486 range(-1, 127) \ 2487 \ 2488 product(intx, JavaPriority10_To_OSPriority,-1, \ 2489 "Map Java priorities to OS priorities") \ 2490 range(-1, 127) \ 2491 \ 2492 experimental(bool, UseCriticalJavaThreadPriority, false, \ 2493 "Java thread priority 10 maps to critical scheduling priority") \ 2494 \ 2495 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 2496 "Compiler thread(s) run at critical scheduling priority") \ 2497 \ 2498 experimental(bool, UseCriticalCMSThreadPriority, false, \ 2499 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 2500 \ 2501 /* compiler debugging */ \ 2502 notproduct(intx, CompileTheWorldStartAt, 1, \ 2503 "First class to consider when using +CompileTheWorld") \ 2504 \ 2505 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 2506 "Last class to consider when using +CompileTheWorld") \ 2507 \ 2508 develop(intx, NewCodeParameter, 0, \ 2509 "Testing Only: Create a dedicated integer parameter before " \ 2510 "putback") \ 2511 \ 2512 /* new oopmap storage allocation */ \ 2513 develop(intx, MinOopMapAllocation, 8, \ 2514 "Minimum number of OopMap entries in an OopMapSet") \ 2515 \ 2516 /* Background Compilation */ \ 2517 develop(intx, LongCompileThreshold, 50, \ 2518 "Used with +TraceLongCompiles") \ 2519 \ 2520 /* recompilation */ \ 2521 product_pd(intx, CompileThreshold, \ 2522 "number of interpreted method invocations before (re-)compiling") \ 2523 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 2524 \ 2525 product(double, CompileThresholdScaling, 1.0, \ 2526 "Factor to control when first compilation happens " \ 2527 "(both with and without tiered compilation): " \ 2528 "values greater than 1.0 delay counter overflow, " \ 2529 "values between 0 and 1.0 rush counter overflow, " \ 2530 "value of 1.0 leaves compilation thresholds unchanged " \ 2531 "value of 0.0 is equivalent to -Xint. " \ 2532 "" \ 2533 "Flag can be set as per-method option. " \ 2534 "If a value is specified for a method, compilation thresholds " \ 2535 "for that method are scaled by both the value of the global flag "\ 2536 "and the value of the per-method flag.") \ 2537 range(0.0, DBL_MAX) \ 2538 \ 2539 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 2540 "Interpreter (tier 0) invocation notification frequency") \ 2541 range(0, 30) \ 2542 \ 2543 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 2544 "C1 without MDO (tier 2) invocation notification frequency") \ 2545 range(0, 30) \ 2546 \ 2547 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2548 "C1 with MDO profiling (tier 3) invocation notification " \ 2549 "frequency") \ 2550 range(0, 30) \ 2551 \ 2552 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2553 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2554 range(0, 30) \ 2555 \ 2556 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2557 "Interpreter (tier 0) invocation notification frequency") \ 2558 range(0, 30) \ 2559 \ 2560 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2561 "C1 without MDO (tier 2) invocation notification frequency") \ 2562 range(0, 30) \ 2563 \ 2564 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2565 "C1 with MDO profiling (tier 3) invocation notification " \ 2566 "frequency") \ 2567 range(0, 30) \ 2568 \ 2569 product(intx, Tier2CompileThreshold, 0, \ 2570 "threshold at which tier 2 compilation is invoked") \ 2571 range(0, max_jint) \ 2572 \ 2573 product(intx, Tier2BackEdgeThreshold, 0, \ 2574 "Back edge threshold at which tier 2 compilation is invoked") \ 2575 range(0, max_jint) \ 2576 \ 2577 product(intx, Tier3InvocationThreshold, 200, \ 2578 "Compile if number of method invocations crosses this " \ 2579 "threshold") \ 2580 range(0, max_jint) \ 2581 \ 2582 product(intx, Tier3MinInvocationThreshold, 100, \ 2583 "Minimum invocation to compile at tier 3") \ 2584 range(0, max_jint) \ 2585 \ 2586 product(intx, Tier3CompileThreshold, 2000, \ 2587 "Threshold at which tier 3 compilation is invoked (invocation " \ 2588 "minimum must be satisfied)") \ 2589 range(0, max_jint) \ 2590 \ 2591 product(intx, Tier3BackEdgeThreshold, 60000, \ 2592 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2593 range(0, max_jint) \ 2594 \ 2595 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2596 "Compile if number of method invocations crosses this " \ 2597 "threshold if coming from AOT") \ 2598 range(0, max_jint) \ 2599 \ 2600 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2601 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2602 range(0, max_jint) \ 2603 \ 2604 product(intx, Tier3AOTCompileThreshold, 15000, \ 2605 "Threshold at which tier 3 compilation is invoked (invocation " \ 2606 "minimum must be satisfied) if coming from AOT") \ 2607 range(0, max_jint) \ 2608 \ 2609 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2610 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2611 "if coming from AOT") \ 2612 range(0, max_jint) \ 2613 \ 2614 product(intx, Tier4InvocationThreshold, 5000, \ 2615 "Compile if number of method invocations crosses this " \ 2616 "threshold") \ 2617 range(0, max_jint) \ 2618 \ 2619 product(intx, Tier4MinInvocationThreshold, 600, \ 2620 "Minimum invocation to compile at tier 4") \ 2621 range(0, max_jint) \ 2622 \ 2623 product(intx, Tier4CompileThreshold, 15000, \ 2624 "Threshold at which tier 4 compilation is invoked (invocation " \ 2625 "minimum must be satisfied") \ 2626 range(0, max_jint) \ 2627 \ 2628 product(intx, Tier4BackEdgeThreshold, 40000, \ 2629 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2630 range(0, max_jint) \ 2631 \ 2632 product(intx, Tier3DelayOn, 5, \ 2633 "If C2 queue size grows over this amount per compiler thread " \ 2634 "stop compiling at tier 3 and start compiling at tier 2") \ 2635 range(0, max_jint) \ 2636 \ 2637 product(intx, Tier3DelayOff, 2, \ 2638 "If C2 queue size is less than this amount per compiler thread " \ 2639 "allow methods compiled at tier 2 transition to tier 3") \ 2640 range(0, max_jint) \ 2641 \ 2642 product(intx, Tier3LoadFeedback, 5, \ 2643 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2644 "reaches this amount per compiler thread") \ 2645 range(0, max_jint) \ 2646 \ 2647 product(intx, Tier4LoadFeedback, 3, \ 2648 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2649 "reaches this amount per compiler thread") \ 2650 range(0, max_jint) \ 2651 \ 2652 product(intx, TieredCompileTaskTimeout, 50, \ 2653 "Kill compile task if method was not used within " \ 2654 "given timeout in milliseconds") \ 2655 range(0, max_intx) \ 2656 \ 2657 product(intx, TieredStopAtLevel, 4, \ 2658 "Stop at given compilation level") \ 2659 range(0, 4) \ 2660 \ 2661 product(intx, Tier0ProfilingStartPercentage, 200, \ 2662 "Start profiling in interpreter if the counters exceed tier 3 " \ 2663 "thresholds by the specified percentage") \ 2664 range(0, max_jint) \ 2665 \ 2666 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2667 "Increase the compile threshold for C1 compilation if the code " \ 2668 "cache is filled by the specified percentage") \ 2669 range(0, 99) \ 2670 \ 2671 product(intx, TieredRateUpdateMinTime, 1, \ 2672 "Minimum rate sampling interval (in milliseconds)") \ 2673 range(0, max_intx) \ 2674 \ 2675 product(intx, TieredRateUpdateMaxTime, 25, \ 2676 "Maximum rate sampling interval (in milliseconds)") \ 2677 range(0, max_intx) \ 2678 \ 2679 product_pd(bool, TieredCompilation, \ 2680 "Enable tiered compilation") \ 2681 \ 2682 product(bool, PrintTieredEvents, false, \ 2683 "Print tiered events notifications") \ 2684 \ 2685 product_pd(intx, OnStackReplacePercentage, \ 2686 "NON_TIERED number of method invocations/branches (expressed as " \ 2687 "% of CompileThreshold) before (re-)compiling OSR code") \ 2688 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2689 \ 2690 product(intx, InterpreterProfilePercentage, 33, \ 2691 "NON_TIERED number of method invocations/branches (expressed as " \ 2692 "% of CompileThreshold) before profiling in the interpreter") \ 2693 range(0, 100) \ 2694 \ 2695 develop(intx, MaxRecompilationSearchLength, 10, \ 2696 "The maximum number of frames to inspect when searching for " \ 2697 "recompilee") \ 2698 \ 2699 develop(intx, MaxInterpretedSearchLength, 3, \ 2700 "The maximum number of interpreted frames to skip when searching "\ 2701 "for recompilee") \ 2702 \ 2703 develop(intx, DesiredMethodLimit, 8000, \ 2704 "The desired maximum method size (in bytecodes) after inlining") \ 2705 \ 2706 develop(intx, HugeMethodLimit, 8000, \ 2707 "Don't compile methods larger than this if " \ 2708 "+DontCompileHugeMethods") \ 2709 \ 2710 /* New JDK 1.4 reflection implementation */ \ 2711 \ 2712 develop(intx, FastSuperclassLimit, 8, \ 2713 "Depth of hardwired instanceof accelerator array") \ 2714 \ 2715 /* Properties for Java libraries */ \ 2716 \ 2717 product(uint64_t, MaxDirectMemorySize, 0, \ 2718 "Maximum total size of NIO direct-buffer allocations") \ 2719 range(0, max_jlong) \ 2720 \ 2721 /* Flags used for temporary code during development */ \ 2722 \ 2723 diagnostic(bool, UseNewCode, false, \ 2724 "Testing Only: Use the new version while testing") \ 2725 \ 2726 diagnostic(bool, UseNewCode2, false, \ 2727 "Testing Only: Use the new version while testing") \ 2728 \ 2729 diagnostic(bool, UseNewCode3, false, \ 2730 "Testing Only: Use the new version while testing") \ 2731 \ 2732 /* flags for performance data collection */ \ 2733 \ 2734 product(bool, UsePerfData, true, \ 2735 "Flag to disable jvmstat instrumentation for performance testing "\ 2736 "and problem isolation purposes") \ 2737 \ 2738 product(bool, PerfDataSaveToFile, false, \ 2739 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2740 \ 2741 product(ccstr, PerfDataSaveFile, NULL, \ 2742 "Save PerfData memory to the specified absolute pathname. " \ 2743 "The string %p in the file name (if present) " \ 2744 "will be replaced by pid") \ 2745 \ 2746 product(intx, PerfDataSamplingInterval, 50, \ 2747 "Data sampling interval (in milliseconds)") \ 2748 range(PeriodicTask::min_interval, max_jint) \ 2749 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2750 \ 2751 product(bool, PerfDisableSharedMem, false, \ 2752 "Store performance data in standard memory") \ 2753 \ 2754 product(intx, PerfDataMemorySize, 32*K, \ 2755 "Size of performance data memory region. Will be rounded " \ 2756 "up to a multiple of the native os page size.") \ 2757 range(128, 32*64*K) \ 2758 \ 2759 product(intx, PerfMaxStringConstLength, 1024, \ 2760 "Maximum PerfStringConstant string length before truncation") \ 2761 range(32, 32*K) \ 2762 \ 2763 product(bool, PerfAllowAtExitRegistration, false, \ 2764 "Allow registration of atexit() methods") \ 2765 \ 2766 product(bool, PerfBypassFileSystemCheck, false, \ 2767 "Bypass Win32 file system criteria checks (Windows Only)") \ 2768 \ 2769 product(intx, UnguardOnExecutionViolation, 0, \ 2770 "Unguard page and retry on no-execute fault (Win32 only) " \ 2771 "0=off, 1=conservative, 2=aggressive") \ 2772 range(0, 2) \ 2773 \ 2774 /* Serviceability Support */ \ 2775 \ 2776 product(bool, ManagementServer, false, \ 2777 "Create JMX Management Server") \ 2778 \ 2779 product(bool, DisableAttachMechanism, false, \ 2780 "Disable mechanism that allows tools to attach to this VM") \ 2781 \ 2782 product(bool, StartAttachListener, false, \ 2783 "Always start Attach Listener at VM startup") \ 2784 \ 2785 product(bool, EnableDynamicAgentLoading, true, \ 2786 "Allow tools to load agents with the attach mechanism") \ 2787 \ 2788 manageable(bool, PrintConcurrentLocks, false, \ 2789 "Print java.util.concurrent locks in thread dump") \ 2790 \ 2791 product(bool, TransmitErrorReport, false, \ 2792 "Enable error report transmission on erroneous termination") \ 2793 \ 2794 product(ccstr, ErrorReportServer, NULL, \ 2795 "Override built-in error report server address") \ 2796 \ 2797 /* Shared spaces */ \ 2798 \ 2799 product(bool, UseSharedSpaces, true, \ 2800 "Use shared spaces for metadata") \ 2801 \ 2802 product(bool, VerifySharedSpaces, false, \ 2803 "Verify shared spaces (false for default archive, true for " \ 2804 "archive specified by -XX:SharedArchiveFile)") \ 2805 \ 2806 product(bool, RequireSharedSpaces, false, \ 2807 "Require shared spaces for metadata") \ 2808 \ 2809 product(bool, DumpSharedSpaces, false, \ 2810 "Special mode: JVM reads a class list, loads classes, builds " \ 2811 "shared spaces, and dumps the shared spaces to a file to be " \ 2812 "used in future JVM runs") \ 2813 \ 2814 product(bool, PrintSharedArchiveAndExit, false, \ 2815 "Print shared archive file contents") \ 2816 \ 2817 product(bool, PrintSharedDictionary, false, \ 2818 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2819 "dictionary") \ 2820 \ 2821 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2822 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2823 "Address to allocate shared memory region for class data") \ 2824 range(0, SIZE_MAX) \ 2825 \ 2826 product(bool, UseAppCDS, false, \ 2827 "Enable Application Class Data Sharing when using shared spaces") \ 2828 writeable(CommandLineOnly) \ 2829 \ 2830 product(ccstr, SharedArchiveConfigFile, NULL, \ 2831 "Data to add to the CDS archive file") \ 2832 \ 2833 product(uintx, SharedSymbolTableBucketSize, 4, \ 2834 "Average number of symbols per bucket in shared table") \ 2835 range(2, 246) \ 2836 \ 2837 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 2838 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 2839 "classes. Just exclude them from the shared dictionary.") \ 2840 \ 2841 diagnostic(bool, PrintMethodHandleStubs, false, \ 2842 "Print generated stub code for method handles") \ 2843 \ 2844 develop(bool, TraceMethodHandles, false, \ 2845 "trace internal method handle operations") \ 2846 \ 2847 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2848 "perform extra checks when constructing method handles") \ 2849 \ 2850 diagnostic(bool, ShowHiddenFrames, false, \ 2851 "show method handle implementation frames (usually hidden)") \ 2852 \ 2853 experimental(bool, TrustFinalNonStaticFields, false, \ 2854 "trust final non-static declarations for constant folding") \ 2855 \ 2856 diagnostic(bool, FoldStableValues, true, \ 2857 "Optimize loads from stable fields (marked w/ @Stable)") \ 2858 \ 2859 develop(bool, TraceInvokeDynamic, false, \ 2860 "trace internal invoke dynamic operations") \ 2861 \ 2862 diagnostic(int, UseBootstrapCallInfo, 1, \ 2863 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2864 "resolved before the bootstrap method is called; 1: when a BSM " \ 2865 "that may accept a BootstrapCallInfo is detected, use that API " \ 2866 "to pass BSM arguments, which allows the BSM to delay their " \ 2867 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2868 "via that API, instead of with the eagerly-resolved array.") \ 2869 \ 2870 diagnostic(bool, PauseAtStartup, false, \ 2871 "Causes the VM to pause at startup time and wait for the pause " \ 2872 "file to be removed (default: ./vm.paused.<pid>)") \ 2873 \ 2874 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2875 "The file to create and for whose removal to await when pausing " \ 2876 "at startup. (default: ./vm.paused.<pid>)") \ 2877 \ 2878 diagnostic(bool, PauseAtExit, false, \ 2879 "Pause and wait for keypress on exit if a debugger is attached") \ 2880 \ 2881 product(bool, ExtendedDTraceProbes, false, \ 2882 "Enable performance-impacting dtrace probes") \ 2883 \ 2884 product(bool, DTraceMethodProbes, false, \ 2885 "Enable dtrace probes for method-entry and method-exit") \ 2886 \ 2887 product(bool, DTraceAllocProbes, false, \ 2888 "Enable dtrace probes for object allocation") \ 2889 \ 2890 product(bool, DTraceMonitorProbes, false, \ 2891 "Enable dtrace probes for monitor events") \ 2892 \ 2893 product(bool, RelaxAccessControlCheck, false, \ 2894 "Relax the access control checks in the verifier") \ 2895 \ 2896 product(uintx, StringTableSize, defaultStringTableSize, \ 2897 "Number of buckets in the interned String table") \ 2898 range(minimumStringTableSize, 111*defaultStringTableSize) \ 2899 \ 2900 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2901 "Number of buckets in the JVM internal Symbol table") \ 2902 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 2903 \ 2904 product(bool, UseStringDeduplication, false, \ 2905 "Use string deduplication") \ 2906 \ 2907 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2908 "A string must reach this age (or be promoted to an old region) " \ 2909 "to be considered for deduplication") \ 2910 range(1, markOopDesc::max_age) \ 2911 \ 2912 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2913 "Force table resize every time the table is scanned") \ 2914 \ 2915 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2916 "Force table rehash every time the table is scanned") \ 2917 \ 2918 diagnostic(bool, WhiteBoxAPI, false, \ 2919 "Enable internal testing APIs") \ 2920 \ 2921 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2922 "Default survivor space alignment in bytes") \ 2923 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2924 \ 2925 product(bool , AllowNonVirtualCalls, false, \ 2926 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 2927 \ 2928 product(ccstr, DumpLoadedClassList, NULL, \ 2929 "Dump the names all loaded classes, that could be stored into " \ 2930 "the CDS archive, in the specified file") \ 2931 \ 2932 product(ccstr, SharedClassListFile, NULL, \ 2933 "Override the default CDS class list") \ 2934 \ 2935 diagnostic(ccstr, SharedArchiveFile, NULL, \ 2936 "Override the default location of the CDS archive file") \ 2937 \ 2938 product(ccstr, ExtraSharedClassListFile, NULL, \ 2939 "Extra classlist for building the CDS archive file") \ 2940 \ 2941 experimental(size_t, ArrayAllocatorMallocLimit, \ 2942 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2943 "Allocation less than this value will be allocated " \ 2944 "using malloc. Larger allocations will use mmap.") \ 2945 \ 2946 experimental(bool, AlwaysAtomicAccesses, false, \ 2947 "Accesses to all variables should always be atomic") \ 2948 \ 2949 product(bool, EnableTracing, false, \ 2950 "Enable event-based tracing") \ 2951 \ 2952 product(bool, UseLockedTracing, false, \ 2953 "Use locked-tracing when doing event-based tracing") \ 2954 \ 2955 diagnostic(bool, UseUnalignedAccesses, false, \ 2956 "Use unaligned memory accesses in Unsafe") \ 2957 \ 2958 product_pd(bool, PreserveFramePointer, \ 2959 "Use the FP register for holding the frame pointer " \ 2960 "and not as a general purpose register.") \ 2961 \ 2962 diagnostic(bool, CheckIntrinsics, true, \ 2963 "When a class C is loaded, check that " \ 2964 "(1) all intrinsics defined by the VM for class C are present "\ 2965 "in the loaded class file and are marked with the " \ 2966 "@HotSpotIntrinsicCandidate annotation, that " \ 2967 "(2) there is an intrinsic registered for all loaded methods " \ 2968 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2969 "annotation, and that " \ 2970 "(3) no orphan methods exist for class C (i.e., methods for " \ 2971 "which the VM declares an intrinsic but that are not declared "\ 2972 "in the loaded class C. " \ 2973 "Check (3) is available only in debug builds.") \ 2974 \ 2975 diagnostic_pd(intx, InitArrayShortSize, \ 2976 "Threshold small size (in bytes) for clearing arrays. " \ 2977 "Anything this size or smaller may get converted to discrete " \ 2978 "scalar stores.") \ 2979 range(0, max_intx) \ 2980 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2981 \ 2982 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2983 "Disable backwards compatibility for compile commands.") \ 2984 \ 2985 diagnostic(bool, CompilerDirectivesPrint, false, \ 2986 "Print compiler directives on installation.") \ 2987 diagnostic(int, CompilerDirectivesLimit, 50, \ 2988 "Limit on number of compiler directives.") \ 2989 \ 2990 product(ccstr, AllocateHeapAt, NULL, \ 2991 "Path to the directoy where a temporary file will be created " \ 2992 "to use as the backing store for Java Heap.") \ 2993 \ 2994 develop(bool, VerifyMetaspace, false, \ 2995 "Verify metaspace on chunk movements.") \ 2996 \ 2997 diagnostic(bool, ShowRegistersOnAssert, false, \ 2998 "On internal errors, include registers in error report.") \ 2999 \ 3000 3001 #define VM_FLAGS(develop, \ 3002 develop_pd, \ 3003 product, \ 3004 product_pd, \ 3005 diagnostic, \ 3006 diagnostic_pd, \ 3007 experimental, \ 3008 notproduct, \ 3009 manageable, \ 3010 product_rw, \ 3011 lp64_product, \ 3012 range, \ 3013 constraint, \ 3014 writeable) \ 3015 \ 3016 RUNTIME_FLAGS( \ 3017 develop, \ 3018 develop_pd, \ 3019 product, \ 3020 product_pd, \ 3021 diagnostic, \ 3022 diagnostic_pd, \ 3023 experimental, \ 3024 notproduct, \ 3025 manageable, \ 3026 product_rw, \ 3027 lp64_product, \ 3028 range, \ 3029 constraint, \ 3030 writeable) \ 3031 \ 3032 GC_FLAGS( \ 3033 develop, \ 3034 develop_pd, \ 3035 product, \ 3036 product_pd, \ 3037 diagnostic, \ 3038 diagnostic_pd, \ 3039 experimental, \ 3040 notproduct, \ 3041 manageable, \ 3042 product_rw, \ 3043 lp64_product, \ 3044 range, \ 3045 constraint, \ 3046 writeable) \ 3047 3048 /* 3049 * Macros for factoring of globals 3050 */ 3051 3052 // Interface macros 3053 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3054 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3055 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3056 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 3057 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3058 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3059 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3060 #ifdef PRODUCT 3061 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3062 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3063 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 3064 #else 3065 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3066 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3067 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3068 #endif // PRODUCT 3069 // Special LP64 flags, product only needed for now. 3070 #ifdef _LP64 3071 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3072 #else 3073 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3074 #endif // _LP64 3075 3076 // Implementation macros 3077 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3078 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3079 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3080 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 3081 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3082 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3083 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3084 #ifdef PRODUCT 3085 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 3086 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 3087 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3088 #else 3089 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3090 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3091 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3092 #endif // PRODUCT 3093 #ifdef _LP64 3094 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3095 #else 3096 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3097 #endif // _LP64 3098 3099 // Only materialize src code for range checking when required, ignore otherwise 3100 #define IGNORE_RANGE(a, b) 3101 // Only materialize src code for contraint checking when required, ignore otherwise 3102 #define IGNORE_CONSTRAINT(func,type) 3103 3104 #define IGNORE_WRITEABLE(type) 3105 3106 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3107 DECLARE_PD_DEVELOPER_FLAG, \ 3108 DECLARE_PRODUCT_FLAG, \ 3109 DECLARE_PD_PRODUCT_FLAG, \ 3110 DECLARE_DIAGNOSTIC_FLAG, \ 3111 DECLARE_PD_DIAGNOSTIC_FLAG, \ 3112 DECLARE_EXPERIMENTAL_FLAG, \ 3113 DECLARE_NOTPRODUCT_FLAG, \ 3114 DECLARE_MANAGEABLE_FLAG, \ 3115 DECLARE_PRODUCT_RW_FLAG, \ 3116 DECLARE_LP64_PRODUCT_FLAG, \ 3117 IGNORE_RANGE, \ 3118 IGNORE_CONSTRAINT, \ 3119 IGNORE_WRITEABLE) 3120 3121 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3122 DECLARE_PD_DEVELOPER_FLAG, \ 3123 DECLARE_PRODUCT_FLAG, \ 3124 DECLARE_PD_PRODUCT_FLAG, \ 3125 DECLARE_DIAGNOSTIC_FLAG, \ 3126 DECLARE_PD_DIAGNOSTIC_FLAG, \ 3127 DECLARE_NOTPRODUCT_FLAG, \ 3128 IGNORE_RANGE, \ 3129 IGNORE_CONSTRAINT, \ 3130 IGNORE_WRITEABLE) 3131 3132 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3133 DECLARE_PRODUCT_FLAG, \ 3134 DECLARE_DIAGNOSTIC_FLAG, \ 3135 DECLARE_EXPERIMENTAL_FLAG, \ 3136 DECLARE_NOTPRODUCT_FLAG, \ 3137 IGNORE_RANGE, \ 3138 IGNORE_CONSTRAINT, \ 3139 IGNORE_WRITEABLE) 3140 3141 // Extensions 3142 3143 #include "runtime/globals_ext.hpp" 3144 3145 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP