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 #if INCLUDE_TRACE
455 #define TRACE_ONLY(code) code
456 #else
457 #define TRACE_ONLY(code)
458 #endif
459
460 // use this for flags that are true by default in the debug version but
461 // false in the optimized version, and vice versa
462 #ifdef ASSERT
463 #define trueInDebug true
464 #define falseInDebug false
465 #else
466 #define trueInDebug false
467 #define falseInDebug true
468 #endif
469
470 // use this for flags that are true per default in the product build
471 // but false in development builds, and vice versa
472 #ifdef PRODUCT
473 #define trueInProduct true
474 #define falseInProduct false
475 #else
476 #define trueInProduct false
477 #define falseInProduct true
478 #endif
479
480 // develop flags are settable / visible only during development and are constant in the PRODUCT version
481 // product flags are always settable / visible
482 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
483
484 // A flag must be declared with one of the following types:
485 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
486 // The type "ccstr" is an alias for "const char*" and is used
487 // only in this file, because the macrology requires single-token type names.
488
489 // Note: Diagnostic options not meant for VM tuning or for product modes.
490 // They are to be used for VM quality assurance or field diagnosis
491 // of VM bugs. They are hidden so that users will not be encouraged to
492 // try them as if they were VM ordinary execution options. However, they
493 // are available in the product version of the VM. Under instruction
494 // from support engineers, VM customers can turn them on to collect
495 // diagnostic information about VM problems. To use a VM diagnostic
496 // option, you must first specify +UnlockDiagnosticVMOptions.
497 // (This master switch also affects the behavior of -Xprintflags.)
498 //
499 // experimental flags are in support of features that are not
500 // part of the officially supported product, but are available
501 // for experimenting with. They could, for example, be performance
502 // features that may not have undergone full or rigorous QA, but which may
503 // help performance in some cases and released for experimentation
504 // by the community of users and developers. This flag also allows one to
505 // be able to build a fully supported product that nonetheless also
506 // ships with some unsupported, lightly tested, experimental features.
507 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
508 // UnlockExperimentalVMOptions flag, which allows the control and
509 // modification of the experimental flags.
510 //
511 // Nota bene: neither diagnostic nor experimental options should be used casually,
512 // and they are not supported on production loads, except under explicit
513 // direction from support engineers.
514 //
515 // manageable flags are writeable external product flags.
516 // They are dynamically writeable through the JDK management interface
517 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
518 // These flags are external exported interface (see CCC). The list of
519 // manageable flags can be queried programmatically through the management
520 // interface.
521 //
522 // A flag can be made as "manageable" only if
523 // - the flag is defined in a CCC as an external exported interface.
524 // - the VM implementation supports dynamic setting of the flag.
525 // This implies that the VM must *always* query the flag variable
526 // and not reuse state related to the flag state at any given time.
527 // - you want the flag to be queried programmatically by the customers.
528 //
529 // product_rw flags are writeable internal product flags.
530 // They are like "manageable" flags but for internal/private use.
531 // The list of product_rw flags are internal/private flags which
532 // may be changed/removed in a future release. It can be set
533 // through the management interface to get/set value
534 // when the name of flag is supplied.
535 //
536 // A flag can be made as "product_rw" only if
537 // - the VM implementation supports dynamic setting of the flag.
538 // This implies that the VM must *always* query the flag variable
539 // and not reuse state related to the flag state at any given time.
540 //
541 // Note that when there is a need to support develop flags to be writeable,
542 // it can be done in the same way as product_rw.
543 //
544 // range is a macro that will expand to min and max arguments for range
545 // checking code if provided - see commandLineFlagRangeList.hpp
546 //
547 // constraint is a macro that will expand to custom function call
548 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
549 //
550 // writeable is a macro that controls if and how the value can change during the runtime
551 //
552 // writeable(Always) is optional and allows the flag to have its value changed
553 // without any limitations at any time
554 //
555 // writeable(Once) flag value's can be only set once during the lifetime of VM
556 //
557 // writeable(CommandLineOnly) flag value's can be only set from command line
558 // (multiple times allowed)
559 //
560
561
562 #define RUNTIME_FLAGS(develop, \
563 develop_pd, \
564 product, \
565 product_pd, \
566 diagnostic, \
567 diagnostic_pd, \
568 experimental, \
569 notproduct, \
570 manageable, \
571 product_rw, \
572 lp64_product, \
573 range, \
574 constraint, \
575 writeable) \
576 \
577 lp64_product(bool, UseCompressedOops, false, \
578 "Use 32-bit object references in 64-bit VM. " \
579 "lp64_product means flag is always constant in 32 bit VM") \
580 \
581 lp64_product(bool, UseCompressedClassPointers, false, \
582 "Use 32-bit class pointers in 64-bit VM. " \
583 "lp64_product means flag is always constant in 32 bit VM") \
584 \
585 notproduct(bool, CheckCompressedOops, true, \
586 "Generate checks in encoding/decoding code in debug VM") \
587 \
588 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
589 "Heap allocation steps through preferred address regions to find" \
590 " where it can allocate the heap. Number of steps to take per " \
591 "region.") \
592 range(1, max_uintx) \
593 \
594 lp64_product(intx, ObjectAlignmentInBytes, 8, \
595 "Default object alignment in bytes, 8 is minimum") \
596 range(8, 256) \
597 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
598 \
599 product(bool, AssumeMP, true, \
600 "(Deprecated) Instruct the VM to assume multiple processors are available")\
601 \
602 /* UseMembar is theoretically a temp flag used for memory barrier */ \
603 /* removal testing. It was supposed to be removed before FCS but has */ \
604 /* been re-added (see 6401008) */ \
605 product_pd(bool, UseMembar, \
606 "(Unstable) Issues membars on thread state transitions") \
607 \
608 develop(bool, CleanChunkPoolAsync, true, \
609 "Clean the chunk pool asynchronously") \
610 \
611 product_pd(bool, ThreadLocalHandshakes, \
612 "Use thread-local polls instead of global poll for safepoints.") \
613 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \
614 \
615 diagnostic(uint, HandshakeTimeout, 0, \
616 "If nonzero set a timeout in milliseconds for handshakes") \
617 \
618 experimental(bool, AlwaysSafeConstructors, false, \
619 "Force safe construction, as if all fields are final.") \
620 \
621 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
622 "Enable normal processing of flags relating to field diagnostics")\
623 \
624 experimental(bool, UnlockExperimentalVMOptions, false, \
625 "Enable normal processing of flags relating to experimental " \
626 "features") \
627 \
628 product(bool, JavaMonitorsInStackTrace, true, \
629 "Print information about Java monitor locks when the stacks are" \
630 "dumped") \
631 \
632 product_pd(bool, UseLargePages, \
633 "Use large page memory") \
634 \
635 product_pd(bool, UseLargePagesIndividualAllocation, \
636 "Allocate large pages individually for better affinity") \
637 \
638 develop(bool, LargePagesIndividualAllocationInjectError, false, \
639 "Fail large pages individual allocation") \
640 \
641 product(bool, UseLargePagesInMetaspace, false, \
642 "Use large page memory in metaspace. " \
643 "Only used if UseLargePages is enabled.") \
644 \
645 product(bool, UseNUMA, false, \
646 "Use NUMA if available") \
647 \
648 product(bool, UseNUMAInterleaving, false, \
649 "Interleave memory across NUMA nodes if available") \
650 \
651 product(size_t, NUMAInterleaveGranularity, 2*M, \
652 "Granularity to use for NUMA interleaving on Windows OS") \
653 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
654 \
655 product(bool, ForceNUMA, false, \
656 "Force NUMA optimizations on single-node/UMA systems") \
657 \
658 product(uintx, NUMAChunkResizeWeight, 20, \
659 "Percentage (0-100) used to weight the current sample when " \
660 "computing exponentially decaying average for " \
661 "AdaptiveNUMAChunkSizing") \
662 range(0, 100) \
663 \
664 product(size_t, NUMASpaceResizeRate, 1*G, \
665 "Do not reallocate more than this amount per collection") \
666 range(0, max_uintx) \
667 \
668 product(bool, UseAdaptiveNUMAChunkSizing, true, \
669 "Enable adaptive chunk sizing for NUMA") \
670 \
671 product(bool, NUMAStats, false, \
672 "Print NUMA stats in detailed heap information") \
673 \
674 product(uintx, NUMAPageScanRate, 256, \
675 "Maximum number of pages to include in the page scan procedure") \
676 range(0, max_uintx) \
677 \
678 product_pd(bool, NeedsDeoptSuspend, \
679 "True for register window machines (sparc/ia64)") \
680 \
681 product(intx, UseSSE, 99, \
682 "Highest supported SSE instructions set on x86/x64") \
683 range(0, 99) \
684 \
685 product(bool, UseAES, false, \
686 "Control whether AES instructions are used when available") \
687 \
688 product(bool, UseFMA, false, \
689 "Control whether FMA instructions are used when available") \
690 \
691 product(bool, UseSHA, false, \
692 "Control whether SHA instructions are used when available") \
693 \
694 diagnostic(bool, UseGHASHIntrinsics, false, \
695 "Use intrinsics for GHASH versions of crypto") \
696 \
697 product(size_t, LargePageSizeInBytes, 0, \
698 "Large page size (0 to let VM choose the page size)") \
699 range(0, max_uintx) \
700 \
701 product(size_t, LargePageHeapSizeThreshold, 128*M, \
702 "Use large pages if maximum heap is at least this big") \
703 range(0, max_uintx) \
704 \
705 product(bool, ForceTimeHighResolution, false, \
706 "Using high time resolution (for Win32 only)") \
707 \
708 develop(bool, TracePcPatching, false, \
709 "Trace usage of frame::patch_pc") \
710 \
711 develop(bool, TraceRelocator, false, \
712 "Trace the bytecode relocator") \
713 \
714 develop(bool, TraceLongCompiles, false, \
715 "Print out every time compilation is longer than " \
716 "a given threshold") \
717 \
718 develop(bool, SafepointALot, false, \
719 "Generate a lot of safepoints. This works with " \
720 "GuaranteedSafepointInterval") \
721 \
722 product_pd(bool, BackgroundCompilation, \
723 "A thread requesting compilation is not blocked during " \
724 "compilation") \
725 \
726 product(bool, PrintVMQWaitTime, false, \
727 "Print out the waiting time in VM operation queue") \
728 \
729 product(bool, MethodFlushing, true, \
730 "Reclamation of zombie and not-entrant methods") \
731 \
732 develop(bool, VerifyStack, false, \
733 "Verify stack of each thread when it is entering a runtime call") \
734 \
735 diagnostic(bool, ForceUnreachable, false, \
736 "Make all non code cache addresses to be unreachable by " \
737 "forcing use of 64bit literal fixups") \
738 \
739 notproduct(bool, StressDerivedPointers, false, \
740 "Force scavenge when a derived pointer is detected on stack " \
741 "after rtm call") \
742 \
743 develop(bool, TraceDerivedPointers, false, \
744 "Trace traversal of derived pointers on stack") \
745 \
746 notproduct(bool, TraceCodeBlobStacks, false, \
747 "Trace stack-walk of codeblobs") \
748 \
749 product(bool, PrintJNIResolving, false, \
750 "Used to implement -v:jni") \
751 \
752 notproduct(bool, PrintRewrites, false, \
753 "Print methods that are being rewritten") \
754 \
755 product(bool, UseInlineCaches, true, \
756 "Use Inline Caches for virtual calls ") \
757 \
758 diagnostic(bool, InlineArrayCopy, true, \
759 "Inline arraycopy native that is known to be part of " \
760 "base library DLL") \
761 \
762 diagnostic(bool, InlineObjectHash, true, \
763 "Inline Object::hashCode() native that is known to be part " \
764 "of base library DLL") \
765 \
766 diagnostic(bool, InlineNatives, true, \
767 "Inline natives that are known to be part of base library DLL") \
768 \
769 diagnostic(bool, InlineMathNatives, true, \
770 "Inline SinD, CosD, etc.") \
771 \
772 diagnostic(bool, InlineClassNatives, true, \
773 "Inline Class.isInstance, etc") \
774 \
775 diagnostic(bool, InlineThreadNatives, true, \
776 "Inline Thread.currentThread, etc") \
777 \
778 diagnostic(bool, InlineUnsafeOps, true, \
779 "Inline memory ops (native methods) from Unsafe") \
780 \
781 product(bool, CriticalJNINatives, true, \
782 "Check for critical JNI entry points") \
783 \
784 notproduct(bool, StressCriticalJNINatives, false, \
785 "Exercise register saving code in critical natives") \
786 \
787 diagnostic(bool, UseAESIntrinsics, false, \
788 "Use intrinsics for AES versions of crypto") \
789 \
790 diagnostic(bool, UseAESCTRIntrinsics, false, \
791 "Use intrinsics for the paralleled version of AES/CTR crypto") \
792 \
793 diagnostic(bool, UseSHA1Intrinsics, false, \
794 "Use intrinsics for SHA-1 crypto hash function. " \
795 "Requires that UseSHA is enabled.") \
796 \
797 diagnostic(bool, UseSHA256Intrinsics, false, \
798 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
799 "Requires that UseSHA is enabled.") \
800 \
801 diagnostic(bool, UseSHA512Intrinsics, false, \
802 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
803 "Requires that UseSHA is enabled.") \
804 \
805 diagnostic(bool, UseCRC32Intrinsics, false, \
806 "use intrinsics for java.util.zip.CRC32") \
807 \
808 diagnostic(bool, UseCRC32CIntrinsics, false, \
809 "use intrinsics for java.util.zip.CRC32C") \
810 \
811 diagnostic(bool, UseAdler32Intrinsics, false, \
812 "use intrinsics for java.util.zip.Adler32") \
813 \
814 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
815 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
816 \
817 diagnostic(ccstrlist, DisableIntrinsic, "", \
818 "do not expand intrinsics whose (internal) names appear here") \
819 \
820 develop(bool, TraceCallFixup, false, \
821 "Trace all call fixups") \
822 \
823 develop(bool, DeoptimizeALot, false, \
824 "Deoptimize at every exit from the runtime system") \
825 \
826 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
827 "A comma separated list of bcis to deoptimize at") \
828 \
829 product(bool, DeoptimizeRandom, false, \
830 "Deoptimize random frames on random exit from the runtime system")\
831 \
832 notproduct(bool, ZombieALot, false, \
833 "Create zombies (non-entrant) at exit from the runtime system") \
834 \
835 product(bool, UnlinkSymbolsALot, false, \
836 "Unlink unreferenced symbols from the symbol table at safepoints")\
837 \
838 notproduct(bool, WalkStackALot, false, \
839 "Trace stack (no print) at every exit from the runtime system") \
840 \
841 product(bool, Debugging, false, \
842 "Set when executing debug methods in debug.cpp " \
843 "(to prevent triggering assertions)") \
844 \
845 notproduct(bool, StrictSafepointChecks, trueInDebug, \
846 "Enable strict checks that safepoints cannot happen for threads " \
847 "that use NoSafepointVerifier") \
848 \
849 notproduct(bool, VerifyLastFrame, false, \
850 "Verify oops on last frame on entry to VM") \
851 \
852 product(bool, FailOverToOldVerifier, true, \
853 "Fail over to old verifier when split verifier fails") \
854 \
855 product(bool, SafepointTimeout, false, \
856 "Time out and warn or fail after SafepointTimeoutDelay " \
857 "milliseconds if failed to reach safepoint") \
858 \
859 develop(bool, DieOnSafepointTimeout, false, \
860 "Die upon failure to reach safepoint (see SafepointTimeout)") \
861 \
862 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
863 /* typically, at most a few retries are needed */ \
864 product(intx, SuspendRetryCount, 50, \
865 "Maximum retry count for an external suspend request") \
866 range(0, max_intx) \
867 \
868 product(intx, SuspendRetryDelay, 5, \
869 "Milliseconds to delay per retry (* current_retry_count)") \
870 range(0, max_intx) \
871 \
872 product(bool, AssertOnSuspendWaitFailure, false, \
873 "Assert/Guarantee on external suspend wait failure") \
874 \
875 product(bool, TraceSuspendWaitFailures, false, \
876 "Trace external suspend wait failures") \
877 \
878 product(bool, MaxFDLimit, true, \
879 "Bump the number of file descriptors to maximum in Solaris") \
880 \
881 diagnostic(bool, LogEvents, true, \
882 "Enable the various ring buffer event logs") \
883 \
884 diagnostic(uintx, LogEventsBufferEntries, 10, \
885 "Number of ring buffer event logs") \
886 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
887 \
888 product(bool, BytecodeVerificationRemote, true, \
889 "Enable the Java bytecode verifier for remote classes") \
890 \
891 product(bool, BytecodeVerificationLocal, false, \
892 "Enable the Java bytecode verifier for local classes") \
893 \
894 develop(bool, ForceFloatExceptions, trueInDebug, \
895 "Force exceptions on FP stack under/overflow") \
896 \
897 develop(bool, VerifyStackAtCalls, false, \
898 "Verify that the stack pointer is unchanged after calls") \
899 \
900 develop(bool, TraceJavaAssertions, false, \
901 "Trace java language assertions") \
902 \
903 notproduct(bool, VerifyCodeCache, false, \
904 "Verify code cache on memory allocation/deallocation") \
905 \
906 develop(bool, UseMallocOnly, false, \
907 "Use only malloc/free for allocation (no resource area/arena)") \
908 \
909 develop(bool, PrintMallocStatistics, false, \
910 "Print malloc/free statistics") \
911 \
912 develop(bool, ZapResourceArea, trueInDebug, \
913 "Zap freed resource/arena space with 0xABABABAB") \
914 \
915 notproduct(bool, ZapVMHandleArea, trueInDebug, \
916 "Zap freed VM handle space with 0xBCBCBCBC") \
917 \
918 notproduct(bool, ZapStackSegments, trueInDebug, \
919 "Zap allocated/freed stack segments with 0xFADFADED") \
920 \
921 develop(bool, ZapUnusedHeapArea, trueInDebug, \
922 "Zap unused heap space with 0xBAADBABE") \
923 \
924 develop(bool, CheckZapUnusedHeapArea, false, \
925 "Check zapping of unused heap space") \
926 \
927 develop(bool, ZapFillerObjects, trueInDebug, \
928 "Zap filler objects with 0xDEAFBABE") \
929 \
930 develop(bool, PrintVMMessages, true, \
931 "Print VM messages on console") \
932 \
933 notproduct(uintx, ErrorHandlerTest, 0, \
934 "If > 0, provokes an error after VM initialization; the value " \
935 "determines which error to provoke. See test_error_handler() " \
936 "in vmError.cpp.") \
937 \
938 notproduct(uintx, TestCrashInErrorHandler, 0, \
939 "If > 0, provokes an error inside VM error handler (a secondary " \
940 "crash). see test_error_handler() in vmError.cpp") \
941 \
942 notproduct(bool, TestSafeFetchInErrorHandler, false, \
943 "If true, tests SafeFetch inside error handler.") \
944 \
945 notproduct(bool, TestUnresponsiveErrorHandler, false, \
946 "If true, simulates an unresponsive error handler.") \
947 \
948 develop(bool, Verbose, false, \
949 "Print additional debugging information from other modes") \
950 \
951 develop(bool, PrintMiscellaneous, false, \
952 "Print uncategorized debugging information (requires +Verbose)") \
953 \
954 develop(bool, WizardMode, false, \
955 "Print much more debugging information") \
956 \
957 product(bool, ShowMessageBoxOnError, false, \
958 "Keep process alive on VM fatal error") \
959 \
960 product(bool, CreateCoredumpOnCrash, true, \
961 "Create core/mini dump on VM fatal error") \
962 \
963 product(uint64_t, ErrorLogTimeout, 2 * 60, \
964 "Timeout, in seconds, to limit the time spent on writing an " \
965 "error log in case of a crash.") \
966 range(0, (uint64_t)max_jlong/1000) \
967 \
968 product_pd(bool, UseOSErrorReporting, \
969 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
970 \
971 product(bool, SuppressFatalErrorMessage, false, \
972 "Report NO fatal error message (avoid deadlock)") \
973 \
974 product(ccstrlist, OnError, "", \
975 "Run user-defined commands on fatal error; see VMError.cpp " \
976 "for examples") \
977 \
978 product(ccstrlist, OnOutOfMemoryError, "", \
979 "Run user-defined commands on first java.lang.OutOfMemoryError") \
980 \
981 manageable(bool, HeapDumpBeforeFullGC, false, \
982 "Dump heap to file before any major stop-the-world GC") \
983 \
984 manageable(bool, HeapDumpAfterFullGC, false, \
985 "Dump heap to file after any major stop-the-world GC") \
986 \
987 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
988 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
989 \
990 manageable(ccstr, HeapDumpPath, NULL, \
991 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
992 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
993 "in the working directory)") \
994 \
995 develop(bool, BreakAtWarning, false, \
996 "Execute breakpoint upon encountering VM warning") \
997 \
998 develop(bool, UseFakeTimers, false, \
999 "Tell whether the VM should use system time or a fake timer") \
1000 \
1001 product(ccstr, NativeMemoryTracking, "off", \
1002 "Native memory tracking options") \
1003 \
1004 diagnostic(bool, PrintNMTStatistics, false, \
1005 "Print native memory tracking summary data if it is on") \
1006 \
1007 diagnostic(bool, LogCompilation, false, \
1008 "Log compilation activity in detail to LogFile") \
1009 \
1010 product(bool, PrintCompilation, false, \
1011 "Print compilations") \
1012 \
1013 diagnostic(bool, TraceNMethodInstalls, false, \
1014 "Trace nmethod installation") \
1015 \
1016 diagnostic(intx, ScavengeRootsInCode, 2, \
1017 "0: do not allow scavengable oops in the code cache; " \
1018 "1: allow scavenging from the code cache; " \
1019 "2: emit as many constants as the compiler can see") \
1020 range(0, 2) \
1021 \
1022 product(bool, AlwaysRestoreFPU, false, \
1023 "Restore the FPU control word after every JNI call (expensive)") \
1024 \
1025 diagnostic(bool, PrintCompilation2, false, \
1026 "Print additional statistics per compilation") \
1027 \
1028 diagnostic(bool, PrintAdapterHandlers, false, \
1029 "Print code generated for i2c/c2i adapters") \
1030 \
1031 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1032 "Verify that i2c/c2i adapters are called properly") \
1033 \
1034 develop(bool, VerifyAdapterSharing, false, \
1035 "Verify that the code for shared adapters is the equivalent") \
1036 \
1037 diagnostic(bool, PrintAssembly, false, \
1038 "Print assembly code (using external disassembler.so)") \
1039 \
1040 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1041 "Print options string passed to disassembler.so") \
1042 \
1043 notproduct(bool, PrintNMethodStatistics, false, \
1044 "Print a summary statistic for the generated nmethods") \
1045 \
1046 diagnostic(bool, PrintNMethods, false, \
1047 "Print assembly code for nmethods when generated") \
1048 \
1049 diagnostic(bool, PrintNativeNMethods, false, \
1050 "Print assembly code for native nmethods when generated") \
1051 \
1052 develop(bool, PrintDebugInfo, false, \
1053 "Print debug information for all nmethods when generated") \
1054 \
1055 develop(bool, PrintRelocations, false, \
1056 "Print relocation information for all nmethods when generated") \
1057 \
1058 develop(bool, PrintDependencies, false, \
1059 "Print dependency information for all nmethods when generated") \
1060 \
1061 develop(bool, PrintExceptionHandlers, false, \
1062 "Print exception handler tables for all nmethods when generated") \
1063 \
1064 develop(bool, StressCompiledExceptionHandlers, false, \
1065 "Exercise compiled exception handlers") \
1066 \
1067 develop(bool, InterceptOSException, false, \
1068 "Start debugger when an implicit OS (e.g. NULL) " \
1069 "exception happens") \
1070 \
1071 product(bool, PrintCodeCache, false, \
1072 "Print the code cache memory usage when exiting") \
1073 \
1074 develop(bool, PrintCodeCache2, false, \
1075 "Print detailed usage information on the code cache when exiting")\
1076 \
1077 product(bool, PrintCodeCacheOnCompilation, false, \
1078 "Print the code cache memory usage each time a method is " \
1079 "compiled") \
1080 \
1081 diagnostic(bool, PrintStubCode, false, \
1082 "Print generated stub code") \
1083 \
1084 product(bool, StackTraceInThrowable, true, \
1085 "Collect backtrace in throwable when exception happens") \
1086 \
1087 product(bool, OmitStackTraceInFastThrow, true, \
1088 "Omit backtraces for some 'hot' exceptions in optimized code") \
1089 \
1090 product(bool, ProfilerPrintByteCodeStatistics, false, \
1091 "Print bytecode statistics when dumping profiler output") \
1092 \
1093 product(bool, ProfilerRecordPC, false, \
1094 "Collect ticks for each 16 byte interval of compiled code") \
1095 \
1096 product(bool, ProfileVM, false, \
1097 "Profile ticks that fall within VM (either in the VM Thread " \
1098 "or VM code called through stubs)") \
1099 \
1100 product(bool, ProfileIntervals, false, \
1101 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1102 \
1103 notproduct(bool, ProfilerCheckIntervals, false, \
1104 "Collect and print information on spacing of profiler ticks") \
1105 \
1106 product(bool, PrintWarnings, true, \
1107 "Print JVM warnings to output stream") \
1108 \
1109 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1110 "Print warnings for stalled SpinLocks") \
1111 \
1112 product(bool, RegisterFinalizersAtInit, true, \
1113 "Register finalizable objects at end of Object.<init> or " \
1114 "after allocation") \
1115 \
1116 develop(bool, RegisterReferences, true, \
1117 "Tell whether the VM should register soft/weak/final/phantom " \
1118 "references") \
1119 \
1120 develop(bool, IgnoreRewrites, false, \
1121 "Suppress rewrites of bytecodes in the oopmap generator. " \
1122 "This is unsafe!") \
1123 \
1124 develop(bool, PrintCodeCacheExtension, false, \
1125 "Print extension of code cache") \
1126 \
1127 develop(bool, UsePrivilegedStack, true, \
1128 "Enable the security JVM functions") \
1129 \
1130 develop(bool, ProtectionDomainVerification, true, \
1131 "Verify protection domain before resolution in system dictionary")\
1132 \
1133 product(bool, ClassUnloading, true, \
1134 "Do unloading of classes") \
1135 \
1136 product(bool, ClassUnloadingWithConcurrentMark, true, \
1137 "Do unloading of classes with a concurrent marking cycle") \
1138 \
1139 develop(bool, DisableStartThread, false, \
1140 "Disable starting of additional Java threads " \
1141 "(for debugging only)") \
1142 \
1143 develop(bool, MemProfiling, false, \
1144 "Write memory usage profiling to log file") \
1145 \
1146 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1147 "Print the system dictionary at exit") \
1148 \
1149 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
1150 "Dynamically resize system dictionaries as needed") \
1151 \
1152 product(bool, AlwaysLockClassLoader, false, \
1153 "Require the VM to acquire the class loader lock before calling " \
1154 "loadClass() even for class loaders registering " \
1155 "as parallel capable") \
1156 \
1157 product(bool, AllowParallelDefineClass, false, \
1158 "Allow parallel defineClass requests for class loaders " \
1159 "registering as parallel capable") \
1160 \
1161 product_pd(bool, DontYieldALot, \
1162 "Throw away obvious excess yield calls") \
1163 \
1164 develop(bool, UseDetachedThreads, true, \
1165 "Use detached threads that are recycled upon termination " \
1166 "(for Solaris only)") \
1167 \
1168 experimental(bool, DisablePrimordialThreadGuardPages, false, \
1169 "Disable the use of stack guard pages if the JVM is loaded " \
1170 "on the primordial process thread") \
1171 \
1172 product(bool, UseLWPSynchronization, true, \
1173 "Use LWP-based instead of libthread-based synchronization " \
1174 "(SPARC only)") \
1175 \
1176 experimental(ccstr, SyncKnobs, NULL, \
1177 "(Unstable) Various monitor synchronization tunables") \
1178 \
1179 experimental(intx, EmitSync, 0, \
1180 "(Unsafe, Unstable) " \
1181 "Control emission of inline sync fast-path code") \
1182 \
1183 product(intx, MonitorBound, 0, "Bound Monitor population") \
1184 range(0, max_jint) \
1185 \
1186 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1187 \
1188 experimental(intx, MonitorUsedDeflationThreshold, 90, \
1189 "Percentage of used monitors before triggering cleanup " \
1190 "safepoint which deflates monitors (0 is off). " \
1191 "The check is performed on GuaranteedSafepointInterval.") \
1192 range(0, 100) \
1193 \
1194 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1195 "Experimental Sync flags") \
1196 \
1197 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1198 \
1199 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1200 \
1201 experimental(intx, hashCode, 5, \
1202 "(Unstable) select hashCode generation algorithm") \
1203 \
1204 product(bool, FilterSpuriousWakeups, true, \
1205 "When true prevents OS-level spurious, or premature, wakeups " \
1206 "from Object.wait (Ignored for Windows)") \
1207 \
1208 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1209 \
1210 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1211 \
1212 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1213 \
1214 develop(bool, UsePthreads, false, \
1215 "Use pthread-based instead of libthread-based synchronization " \
1216 "(SPARC only)") \
1217 \
1218 product(bool, ReduceSignalUsage, false, \
1219 "Reduce the use of OS signals in Java and/or the VM") \
1220 \
1221 develop_pd(bool, ShareVtableStubs, \
1222 "Share vtable stubs (smaller code but worse branch prediction") \
1223 \
1224 develop(bool, LoadLineNumberTables, true, \
1225 "Tell whether the class file parser loads line number tables") \
1226 \
1227 develop(bool, LoadLocalVariableTables, true, \
1228 "Tell whether the class file parser loads local variable tables") \
1229 \
1230 develop(bool, LoadLocalVariableTypeTables, true, \
1231 "Tell whether the class file parser loads local variable type" \
1232 "tables") \
1233 \
1234 product(bool, AllowUserSignalHandlers, false, \
1235 "Do not complain if the application installs signal handlers " \
1236 "(Solaris & Linux only)") \
1237 \
1238 product(bool, UseSignalChaining, true, \
1239 "Use signal-chaining to invoke signal handlers installed " \
1240 "by the application (Solaris & Linux only)") \
1241 \
1242 product(bool, AllowJNIEnvProxy, false, \
1243 "Allow JNIEnv proxies for jdbx") \
1244 \
1245 product(bool, RestoreMXCSROnJNICalls, false, \
1246 "Restore MXCSR when returning from JNI calls") \
1247 \
1248 product(bool, CheckJNICalls, false, \
1249 "Verify all arguments to JNI calls") \
1250 \
1251 product(bool, UseFastJNIAccessors, true, \
1252 "Use optimized versions of Get<Primitive>Field") \
1253 \
1254 product(intx, MaxJNILocalCapacity, 65536, \
1255 "Maximum allowable local JNI handle capacity to " \
1256 "EnsureLocalCapacity() and PushLocalFrame(), " \
1257 "where <= 0 is unlimited, default: 65536") \
1258 range(min_intx, max_intx) \
1259 \
1260 product(bool, EagerXrunInit, false, \
1261 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1262 "but not all -Xrun libraries may support the state of the VM " \
1263 "at this time") \
1264 \
1265 product(bool, PreserveAllAnnotations, false, \
1266 "Preserve RuntimeInvisibleAnnotations as well " \
1267 "as RuntimeVisibleAnnotations") \
1268 \
1269 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1270 "Number of OutOfMemoryErrors preallocated with backtrace") \
1271 \
1272 product(bool, UseXMMForArrayCopy, false, \
1273 "Use SSE2 MOVQ instruction for Arraycopy") \
1274 \
1275 product(intx, FieldsAllocationStyle, 1, \
1276 "0 - type based with oops first, " \
1277 "1 - with oops last, " \
1278 "2 - oops in super and sub classes are together") \
1279 range(0, 2) \
1280 \
1281 product(bool, CompactFields, true, \
1282 "Allocate nonstatic fields in gaps between previous fields") \
1283 \
1284 notproduct(bool, PrintFieldLayout, false, \
1285 "Print field layout for each class") \
1286 \
1287 /* Need to limit the extent of the padding to reasonable size. */\
1288 /* 8K is well beyond the reasonable HW cache line size, even with */\
1289 /* aggressive prefetching, while still leaving the room for segregating */\
1290 /* among the distinct pages. */\
1291 product(intx, ContendedPaddingWidth, 128, \
1292 "How many bytes to pad the fields/classes marked @Contended with")\
1293 range(0, 8192) \
1294 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1295 \
1296 product(bool, EnableContended, true, \
1297 "Enable @Contended annotation support") \
1298 \
1299 product(bool, RestrictContended, true, \
1300 "Restrict @Contended to trusted classes") \
1301 \
1302 product(bool, UseBiasedLocking, true, \
1303 "Enable biased locking in JVM") \
1304 \
1305 product(intx, BiasedLockingStartupDelay, 0, \
1306 "Number of milliseconds to wait before enabling biased locking") \
1307 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1308 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1309 \
1310 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1311 "Print statistics of biased locking in JVM") \
1312 \
1313 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1314 "Threshold of number of revocations per type to try to " \
1315 "rebias all objects in the heap of that type") \
1316 range(0, max_intx) \
1317 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1318 \
1319 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1320 "Threshold of number of revocations per type to permanently " \
1321 "revoke biases of all objects in the heap of that type") \
1322 range(0, max_intx) \
1323 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1324 \
1325 product(intx, BiasedLockingDecayTime, 25000, \
1326 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1327 "type after previous bulk rebias") \
1328 range(500, max_intx) \
1329 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1330 \
1331 product(bool, ExitOnOutOfMemoryError, false, \
1332 "JVM exits on the first occurrence of an out-of-memory error") \
1333 \
1334 product(bool, CrashOnOutOfMemoryError, false, \
1335 "JVM aborts, producing an error log and core/mini dump, on the " \
1336 "first occurrence of an out-of-memory error") \
1337 \
1338 /* tracing */ \
1339 \
1340 develop(bool, StressRewriter, false, \
1341 "Stress linktime bytecode rewriting") \
1342 \
1343 product(ccstr, TraceJVMTI, NULL, \
1344 "Trace flags for JVMTI functions and events") \
1345 \
1346 /* This option can change an EMCP method into an obsolete method. */ \
1347 /* This can affect tests that except specific methods to be EMCP. */ \
1348 /* This option should be used with caution. */ \
1349 product(bool, StressLdcRewrite, false, \
1350 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1351 \
1352 /* change to false by default sometime after Mustang */ \
1353 product(bool, VerifyMergedCPBytecodes, true, \
1354 "Verify bytecodes after RedefineClasses constant pool merging") \
1355 \
1356 develop(bool, TraceBytecodes, false, \
1357 "Trace bytecode execution") \
1358 \
1359 develop(bool, TraceICs, false, \
1360 "Trace inline cache changes") \
1361 \
1362 notproduct(bool, TraceInvocationCounterOverflow, false, \
1363 "Trace method invocation counter overflow") \
1364 \
1365 develop(bool, TraceInlineCacheClearing, false, \
1366 "Trace clearing of inline caches in nmethods") \
1367 \
1368 develop(bool, TraceDependencies, false, \
1369 "Trace dependencies") \
1370 \
1371 develop(bool, VerifyDependencies, trueInDebug, \
1372 "Exercise and verify the compilation dependency mechanism") \
1373 \
1374 develop(bool, TraceNewOopMapGeneration, false, \
1375 "Trace OopMapGeneration") \
1376 \
1377 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1378 "Trace OopMapGeneration: print detailed cell states") \
1379 \
1380 develop(bool, TimeOopMap, false, \
1381 "Time calls to GenerateOopMap::compute_map() in sum") \
1382 \
1383 develop(bool, TimeOopMap2, false, \
1384 "Time calls to GenerateOopMap::compute_map() individually") \
1385 \
1386 develop(bool, TraceOopMapRewrites, false, \
1387 "Trace rewriting of method oops during oop map generation") \
1388 \
1389 develop(bool, TraceICBuffer, false, \
1390 "Trace usage of IC buffer") \
1391 \
1392 develop(bool, TraceCompiledIC, false, \
1393 "Trace changes of compiled IC") \
1394 \
1395 develop(bool, FLSVerifyDictionary, false, \
1396 "Do lots of (expensive) FLS dictionary verification") \
1397 \
1398 \
1399 notproduct(bool, CheckMemoryInitialization, false, \
1400 "Check memory initialization") \
1401 \
1402 product(uintx, ProcessDistributionStride, 4, \
1403 "Stride through processors when distributing processes") \
1404 range(0, max_juint) \
1405 \
1406 develop(bool, TraceFinalizerRegistration, false, \
1407 "Trace registration of final references") \
1408 \
1409 notproduct(bool, TraceScavenge, false, \
1410 "Trace scavenge") \
1411 \
1412 product(bool, IgnoreEmptyClassPaths, false, \
1413 "Ignore empty path elements in -classpath") \
1414 \
1415 product(size_t, InitialBootClassLoaderMetaspaceSize, \
1416 NOT_LP64(2200*K) LP64_ONLY(4*M), \
1417 "Initial size of the boot class loader data metaspace") \
1418 range(30*K, max_uintx/BytesPerWord) \
1419 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
1420 \
1421 product(bool, PrintHeapAtSIGBREAK, true, \
1422 "Print heap layout in response to SIGBREAK") \
1423 \
1424 manageable(bool, PrintClassHistogram, false, \
1425 "Print a histogram of class instances") \
1426 \
1427 develop(bool, IgnoreLibthreadGPFault, false, \
1428 "Suppress workaround for libthread GP fault") \
1429 \
1430 experimental(double, ObjectCountCutOffPercent, 0.5, \
1431 "The percentage of the used heap that the instances of a class " \
1432 "must occupy for the class to generate a trace event") \
1433 range(0.0, 100.0) \
1434 \
1435 /* JVMTI heap profiling */ \
1436 \
1437 diagnostic(bool, TraceJVMTIObjectTagging, false, \
1438 "Trace JVMTI object tagging calls") \
1439 \
1440 diagnostic(bool, VerifyBeforeIteration, false, \
1441 "Verify memory system before JVMTI iteration") \
1442 \
1443 /* compiler interface */ \
1444 \
1445 develop(bool, CIPrintCompilerName, false, \
1446 "when CIPrint is active, print the name of the active compiler") \
1447 \
1448 diagnostic(bool, CIPrintCompileQueue, false, \
1449 "display the contents of the compile queue whenever a " \
1450 "compilation is enqueued") \
1451 \
1452 develop(bool, CIPrintRequests, false, \
1453 "display every request for compilation") \
1454 \
1455 product(bool, CITime, false, \
1456 "collect timing information for compilation") \
1457 \
1458 develop(bool, CITimeVerbose, false, \
1459 "be more verbose in compilation timings") \
1460 \
1461 develop(bool, CITimeEach, false, \
1462 "display timing information after each successful compilation") \
1463 \
1464 develop(bool, CICountOSR, false, \
1465 "use a separate counter when assigning ids to osr compilations") \
1466 \
1467 develop(bool, CICompileNatives, true, \
1468 "compile native methods if supported by the compiler") \
1469 \
1470 develop_pd(bool, CICompileOSR, \
1471 "compile on stack replacement methods if supported by the " \
1472 "compiler") \
1473 \
1474 develop(bool, CIPrintMethodCodes, false, \
1475 "print method bytecodes of the compiled code") \
1476 \
1477 develop(bool, CIPrintTypeFlow, false, \
1478 "print the results of ciTypeFlow analysis") \
1479 \
1480 develop(bool, CITraceTypeFlow, false, \
1481 "detailed per-bytecode tracing of ciTypeFlow analysis") \
1482 \
1483 develop(intx, OSROnlyBCI, -1, \
1484 "OSR only at this bci. Negative values mean exclude that bci") \
1485 \
1486 /* compiler */ \
1487 \
1488 /* notice: the max range value here is max_jint, not max_intx */ \
1489 /* because of overflow issue */ \
1490 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
1491 "Number of compiler threads to run") \
1492 range(0, max_jint) \
1493 constraint(CICompilerCountConstraintFunc, AfterErgo) \
1494 \
1495 product(intx, CompilationPolicyChoice, 0, \
1496 "which compilation policy (0-3)") \
1497 range(0, 3) \
1498 \
1499 develop(bool, UseStackBanging, true, \
1500 "use stack banging for stack overflow checks (required for " \
1501 "proper StackOverflow handling; disable only to measure cost " \
1502 "of stackbanging)") \
1503 \
1504 develop(bool, UseStrictFP, true, \
1505 "use strict fp if modifier strictfp is set") \
1506 \
1507 develop(bool, GenerateSynchronizationCode, true, \
1508 "generate locking/unlocking code for synchronized methods and " \
1509 "monitors") \
1510 \
1511 develop(bool, GenerateRangeChecks, true, \
1512 "Generate range checks for array accesses") \
1513 \
1514 diagnostic_pd(bool, ImplicitNullChecks, \
1515 "Generate code for implicit null checks") \
1516 \
1517 product_pd(bool, TrapBasedNullChecks, \
1518 "Generate code for null checks that uses a cmp and trap " \
1519 "instruction raising SIGTRAP. This is only used if an access to" \
1520 "null (+offset) will not raise a SIGSEGV, i.e.," \
1521 "ImplicitNullChecks don't work (PPC64).") \
1522 \
1523 product(bool, PrintSafepointStatistics, false, \
1524 "(Deprecated) Print statistics about safepoint synchronization") \
1525 \
1526 product(intx, PrintSafepointStatisticsCount, 300, \
1527 "(Deprecated) Total number of safepoint statistics collected " \
1528 "before printing them out") \
1529 range(1, max_intx) \
1530 \
1531 product(intx, PrintSafepointStatisticsTimeout, -1, \
1532 "(Deprecated) Print safepoint statistics only when safepoint takes " \
1533 "more than PrintSafepointSatisticsTimeout in millis") \
1534 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
1535 NOT_LP64(range(-1, max_intx)) \
1536 \
1537 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
1538 "Enable Thread SMR extra validity checks") \
1539 \
1540 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \
1541 "Enable Thread SMR Statistics") \
1542 \
1543 product(bool, Inline, true, \
1544 "Enable inlining") \
1545 \
1546 product(bool, ClipInlining, true, \
1547 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
1548 \
1549 develop(bool, UseCHA, true, \
1550 "Enable CHA") \
1551 \
1552 product(bool, UseTypeProfile, true, \
1553 "Check interpreter profile for historically monomorphic calls") \
1554 \
1555 diagnostic(bool, PrintInlining, false, \
1556 "Print inlining optimizations") \
1557 \
1558 product(bool, UsePopCountInstruction, false, \
1559 "Use population count instruction") \
1560 \
1561 develop(bool, EagerInitialization, false, \
1562 "Eagerly initialize classes if possible") \
1563 \
1564 diagnostic(bool, LogTouchedMethods, false, \
1565 "Log methods which have been ever touched in runtime") \
1566 \
1567 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
1568 "Print all methods that have been ever touched in runtime") \
1569 \
1570 develop(bool, TraceMethodReplacement, false, \
1571 "Print when methods are replaced do to recompilation") \
1572 \
1573 develop(bool, PrintMethodFlushing, false, \
1574 "Print the nmethods being flushed") \
1575 \
1576 diagnostic(bool, PrintMethodFlushingStatistics, false, \
1577 "print statistics about method flushing") \
1578 \
1579 diagnostic(intx, HotMethodDetectionLimit, 100000, \
1580 "Number of compiled code invocations after which " \
1581 "the method is considered as hot by the flusher") \
1582 range(1, max_jint) \
1583 \
1584 diagnostic(intx, MinPassesBeforeFlush, 10, \
1585 "Minimum number of sweeper passes before an nmethod " \
1586 "can be flushed") \
1587 range(0, max_intx) \
1588 \
1589 product(bool, UseCodeAging, true, \
1590 "Insert counter to detect warm methods") \
1591 \
1592 diagnostic(bool, StressCodeAging, false, \
1593 "Start with counters compiled in") \
1594 \
1595 develop(bool, StressCodeBuffers, false, \
1596 "Exercise code buffer expansion and other rare state changes") \
1597 \
1598 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
1599 "Generate extra debugging information for non-safepoints in " \
1600 "nmethods") \
1601 \
1602 product(bool, PrintVMOptions, false, \
1603 "Print flags that appeared on the command line") \
1604 \
1605 product(bool, IgnoreUnrecognizedVMOptions, false, \
1606 "Ignore unrecognized VM options") \
1607 \
1608 product(bool, PrintCommandLineFlags, false, \
1609 "Print flags specified on command line or set by ergonomics") \
1610 \
1611 product(bool, PrintFlagsInitial, false, \
1612 "Print all VM flags before argument processing and exit VM") \
1613 \
1614 product(bool, PrintFlagsFinal, false, \
1615 "Print all VM flags after argument and ergonomic processing") \
1616 \
1617 notproduct(bool, PrintFlagsWithComments, false, \
1618 "Print all VM flags with default values and descriptions and " \
1619 "exit") \
1620 \
1621 product(bool, PrintFlagsRanges, false, \
1622 "Print VM flags and their ranges and exit VM") \
1623 \
1624 diagnostic(bool, SerializeVMOutput, true, \
1625 "Use a mutex to serialize output to tty and LogFile") \
1626 \
1627 diagnostic(bool, DisplayVMOutput, true, \
1628 "Display all VM output on the tty, independently of LogVMOutput") \
1629 \
1630 diagnostic(bool, LogVMOutput, false, \
1631 "Save VM output to LogFile") \
1632 \
1633 diagnostic(ccstr, LogFile, NULL, \
1634 "If LogVMOutput or LogCompilation is on, save VM output to " \
1635 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1636 \
1637 product(ccstr, ErrorFile, NULL, \
1638 "If an error occurs, save the error data to this file " \
1639 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
1640 \
1641 product(bool, DisplayVMOutputToStderr, false, \
1642 "If DisplayVMOutput is true, display all VM output to stderr") \
1643 \
1644 product(bool, DisplayVMOutputToStdout, false, \
1645 "If DisplayVMOutput is true, display all VM output to stdout") \
1646 \
1647 product(bool, UseHeavyMonitors, false, \
1648 "use heavyweight instead of lightweight Java monitors") \
1649 \
1650 product(bool, PrintStringTableStatistics, false, \
1651 "print statistics about the StringTable and SymbolTable") \
1652 \
1653 diagnostic(bool, VerifyStringTableAtExit, false, \
1654 "verify StringTable contents at exit") \
1655 \
1656 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
1657 "print histogram of the symbol table") \
1658 \
1659 notproduct(bool, ExitVMOnVerifyError, false, \
1660 "standard exit from VM if bytecode verify error " \
1661 "(only in debug mode)") \
1662 \
1663 diagnostic(ccstr, AbortVMOnException, NULL, \
1664 "Call fatal if this exception is thrown. Example: " \
1665 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1666 \
1667 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
1668 "Call fatal if the exception pointed by AbortVMOnException " \
1669 "has this message") \
1670 \
1671 develop(bool, DebugVtables, false, \
1672 "add debugging code to vtable dispatch") \
1673 \
1674 notproduct(bool, PrintVtableStats, false, \
1675 "print vtables stats at end of run") \
1676 \
1677 develop(bool, TraceCreateZombies, false, \
1678 "trace creation of zombie nmethods") \
1679 \
1680 notproduct(bool, IgnoreLockingAssertions, false, \
1681 "disable locking assertions (for speed)") \
1682 \
1683 product(bool, RangeCheckElimination, true, \
1684 "Eliminate range checks") \
1685 \
1686 develop_pd(bool, UncommonNullCast, \
1687 "track occurrences of null in casts; adjust compiler tactics") \
1688 \
1689 develop(bool, TypeProfileCasts, true, \
1690 "treat casts like calls for purposes of type profiling") \
1691 \
1692 develop(bool, DelayCompilationDuringStartup, true, \
1693 "Delay invoking the compiler until main application class is " \
1694 "loaded") \
1695 \
1696 develop(bool, CompileTheWorld, false, \
1697 "Compile all methods in all classes in bootstrap class path " \
1698 "(stress test)") \
1699 \
1700 develop(bool, CompileTheWorldPreloadClasses, true, \
1701 "Preload all classes used by a class before start loading") \
1702 \
1703 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
1704 "Force a safepoint every n compiles so sweeper can keep up") \
1705 \
1706 develop(bool, FillDelaySlots, true, \
1707 "Fill delay slots (on SPARC only)") \
1708 \
1709 develop(bool, TimeLivenessAnalysis, false, \
1710 "Time computation of bytecode liveness analysis") \
1711 \
1712 develop(bool, TraceLivenessGen, false, \
1713 "Trace the generation of liveness analysis information") \
1714 \
1715 notproduct(bool, TraceLivenessQuery, false, \
1716 "Trace queries of liveness analysis information") \
1717 \
1718 notproduct(bool, CollectIndexSetStatistics, false, \
1719 "Collect information about IndexSets") \
1720 \
1721 develop(bool, UseLoopSafepoints, true, \
1722 "Generate Safepoint nodes in every loop") \
1723 \
1724 develop(intx, FastAllocateSizeLimit, 128*K, \
1725 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
1726 "Inline allocations larger than this in doublewords must go slow")\
1727 \
1728 product(bool, AggressiveOpts, false, \
1729 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
1730 \
1731 product_pd(bool, CompactStrings, \
1732 "Enable Strings to use single byte chars in backing store") \
1733 \
1734 product_pd(uintx, TypeProfileLevel, \
1735 "=XYZ, with Z: Type profiling of arguments at call; " \
1736 "Y: Type profiling of return value at call; " \
1737 "X: Type profiling of parameters to methods; " \
1738 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
1739 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
1740 \
1741 product(intx, TypeProfileArgsLimit, 2, \
1742 "max number of call arguments to consider for type profiling") \
1743 range(0, 16) \
1744 \
1745 product(intx, TypeProfileParmsLimit, 2, \
1746 "max number of incoming parameters to consider for type profiling"\
1747 ", -1 for all") \
1748 range(-1, 64) \
1749 \
1750 /* statistics */ \
1751 develop(bool, CountCompiledCalls, false, \
1752 "Count method invocations") \
1753 \
1754 notproduct(bool, CountRuntimeCalls, false, \
1755 "Count VM runtime calls") \
1756 \
1757 develop(bool, CountJNICalls, false, \
1758 "Count jni method invocations") \
1759 \
1760 notproduct(bool, CountJVMCalls, false, \
1761 "Count jvm method invocations") \
1762 \
1763 notproduct(bool, CountRemovableExceptions, false, \
1764 "Count exceptions that could be replaced by branches due to " \
1765 "inlining") \
1766 \
1767 notproduct(bool, ICMissHistogram, false, \
1768 "Produce histogram of IC misses") \
1769 \
1770 /* interpreter */ \
1771 product_pd(bool, RewriteBytecodes, \
1772 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
1773 \
1774 product_pd(bool, RewriteFrequentPairs, \
1775 "Rewrite frequently used bytecode pairs into a single bytecode") \
1776 \
1777 diagnostic(bool, PrintInterpreter, false, \
1778 "Print the generated interpreter code") \
1779 \
1780 product(bool, UseInterpreter, true, \
1781 "Use interpreter for non-compiled methods") \
1782 \
1783 develop(bool, UseFastSignatureHandlers, true, \
1784 "Use fast signature handlers for native calls") \
1785 \
1786 product(bool, UseLoopCounter, true, \
1787 "Increment invocation counter on backward branch") \
1788 \
1789 product_pd(bool, UseOnStackReplacement, \
1790 "Use on stack replacement, calls runtime if invoc. counter " \
1791 "overflows in loop") \
1792 \
1793 notproduct(bool, TraceOnStackReplacement, false, \
1794 "Trace on stack replacement") \
1795 \
1796 product_pd(bool, PreferInterpreterNativeStubs, \
1797 "Use always interpreter stubs for native methods invoked via " \
1798 "interpreter") \
1799 \
1800 develop(bool, CountBytecodes, false, \
1801 "Count number of bytecodes executed") \
1802 \
1803 develop(bool, PrintBytecodeHistogram, false, \
1804 "Print histogram of the executed bytecodes") \
1805 \
1806 develop(bool, PrintBytecodePairHistogram, false, \
1807 "Print histogram of the executed bytecode pairs") \
1808 \
1809 diagnostic(bool, PrintSignatureHandlers, false, \
1810 "Print code generated for native method signature handlers") \
1811 \
1812 develop(bool, VerifyOops, false, \
1813 "Do plausibility checks for oops") \
1814 \
1815 develop(bool, CheckUnhandledOops, false, \
1816 "Check for unhandled oops in VM code") \
1817 \
1818 develop(bool, VerifyJNIFields, trueInDebug, \
1819 "Verify jfieldIDs for instance fields") \
1820 \
1821 notproduct(bool, VerifyJNIEnvThread, false, \
1822 "Verify JNIEnv.thread == Thread::current() when entering VM " \
1823 "from JNI") \
1824 \
1825 develop(bool, VerifyFPU, false, \
1826 "Verify FPU state (check for NaN's, etc.)") \
1827 \
1828 develop(bool, VerifyThread, false, \
1829 "Watch the thread register for corruption (SPARC only)") \
1830 \
1831 develop(bool, VerifyActivationFrameSize, false, \
1832 "Verify that activation frame didn't become smaller than its " \
1833 "minimal size") \
1834 \
1835 develop(bool, TraceFrequencyInlining, false, \
1836 "Trace frequency based inlining") \
1837 \
1838 develop_pd(bool, InlineIntrinsics, \
1839 "Inline intrinsics that can be statically resolved") \
1840 \
1841 product_pd(bool, ProfileInterpreter, \
1842 "Profile at the bytecode level during interpretation") \
1843 \
1844 develop(bool, TraceProfileInterpreter, false, \
1845 "Trace profiling at the bytecode level during interpretation. " \
1846 "This outputs the profiling information collected to improve " \
1847 "jit compilation.") \
1848 \
1849 develop_pd(bool, ProfileTraps, \
1850 "Profile deoptimization traps at the bytecode level") \
1851 \
1852 product(intx, ProfileMaturityPercentage, 20, \
1853 "number of method invocations/branches (expressed as % of " \
1854 "CompileThreshold) before using the method's profile") \
1855 range(0, 100) \
1856 \
1857 diagnostic(bool, PrintMethodData, false, \
1858 "Print the results of +ProfileInterpreter at end of run") \
1859 \
1860 develop(bool, VerifyDataPointer, trueInDebug, \
1861 "Verify the method data pointer during interpreter profiling") \
1862 \
1863 develop(bool, VerifyCompiledCode, false, \
1864 "Include miscellaneous runtime verifications in nmethod code; " \
1865 "default off because it disturbs nmethod size heuristics") \
1866 \
1867 notproduct(bool, CrashGCForDumpingJavaThread, false, \
1868 "Manually make GC thread crash then dump java stack trace; " \
1869 "Test only") \
1870 \
1871 /* compilation */ \
1872 product(bool, UseCompiler, true, \
1873 "Use Just-In-Time compilation") \
1874 \
1875 develop(bool, TraceCompilationPolicy, false, \
1876 "Trace compilation policy") \
1877 \
1878 develop(bool, TimeCompilationPolicy, false, \
1879 "Time the compilation policy") \
1880 \
1881 product(bool, UseCounterDecay, true, \
1882 "Adjust recompilation counters") \
1883 \
1884 develop(intx, CounterHalfLifeTime, 30, \
1885 "Half-life time of invocation counters (in seconds)") \
1886 \
1887 develop(intx, CounterDecayMinIntervalLength, 500, \
1888 "The minimum interval (in milliseconds) between invocation of " \
1889 "CounterDecay") \
1890 \
1891 product(bool, AlwaysCompileLoopMethods, false, \
1892 "When using recompilation, never interpret methods " \
1893 "containing loops") \
1894 \
1895 product(bool, DontCompileHugeMethods, true, \
1896 "Do not compile methods > HugeMethodLimit") \
1897 \
1898 /* Bytecode escape analysis estimation. */ \
1899 product(bool, EstimateArgEscape, true, \
1900 "Analyze bytecodes to estimate escape state of arguments") \
1901 \
1902 product(intx, BCEATraceLevel, 0, \
1903 "How much tracing to do of bytecode escape analysis estimates " \
1904 "(0-3)") \
1905 range(0, 3) \
1906 \
1907 product(intx, MaxBCEAEstimateLevel, 5, \
1908 "Maximum number of nested calls that are analyzed by BC EA") \
1909 range(0, max_jint) \
1910 \
1911 product(intx, MaxBCEAEstimateSize, 150, \
1912 "Maximum bytecode size of a method to be analyzed by BC EA") \
1913 range(0, max_jint) \
1914 \
1915 product(intx, AllocatePrefetchStyle, 1, \
1916 "0 = no prefetch, " \
1917 "1 = generate prefetch instructions for each allocation, " \
1918 "2 = use TLAB watermark to gate allocation prefetch, " \
1919 "3 = generate one prefetch instruction per cache line") \
1920 range(0, 3) \
1921 \
1922 product(intx, AllocatePrefetchDistance, -1, \
1923 "Distance to prefetch ahead of allocation pointer. " \
1924 "-1: use system-specific value (automatically determined") \
1925 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
1926 \
1927 product(intx, AllocatePrefetchLines, 3, \
1928 "Number of lines to prefetch ahead of array allocation pointer") \
1929 range(1, 64) \
1930 \
1931 product(intx, AllocateInstancePrefetchLines, 1, \
1932 "Number of lines to prefetch ahead of instance allocation " \
1933 "pointer") \
1934 range(1, 64) \
1935 \
1936 product(intx, AllocatePrefetchStepSize, 16, \
1937 "Step size in bytes of sequential prefetch instructions") \
1938 range(1, 512) \
1939 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1940 \
1941 product(intx, AllocatePrefetchInstr, 0, \
1942 "Select instruction to prefetch ahead of allocation pointer") \
1943 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
1944 \
1945 /* deoptimization */ \
1946 develop(bool, TraceDeoptimization, false, \
1947 "Trace deoptimization") \
1948 \
1949 develop(bool, PrintDeoptimizationDetails, false, \
1950 "Print more information about deoptimization") \
1951 \
1952 develop(bool, DebugDeoptimization, false, \
1953 "Tracing various information while debugging deoptimization") \
1954 \
1955 product(intx, SelfDestructTimer, 0, \
1956 "Will cause VM to terminate after a given time (in minutes) " \
1957 "(0 means off)") \
1958 range(0, max_intx) \
1959 \
1960 product(intx, MaxJavaStackTraceDepth, 1024, \
1961 "The maximum number of lines in the stack trace for Java " \
1962 "exceptions (0 means all)") \
1963 range(0, max_jint/2) \
1964 \
1965 /* notice: the max range value here is max_jint, not max_intx */ \
1966 /* because of overflow issue */ \
1967 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
1968 "Guarantee a safepoint (at least) every so many milliseconds " \
1969 "(0 means none)") \
1970 range(0, max_jint) \
1971 \
1972 product(intx, SafepointTimeoutDelay, 10000, \
1973 "Delay in milliseconds for option SafepointTimeout") \
1974 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
1975 NOT_LP64(range(0, max_intx)) \
1976 \
1977 product(intx, NmethodSweepActivity, 10, \
1978 "Removes cold nmethods from code cache if > 0. Higher values " \
1979 "result in more aggressive sweeping") \
1980 range(0, 2000) \
1981 \
1982 notproduct(bool, LogSweeper, false, \
1983 "Keep a ring buffer of sweeper activity") \
1984 \
1985 notproduct(intx, SweeperLogEntries, 1024, \
1986 "Number of records in the ring buffer of sweeper activity") \
1987 \
1988 notproduct(intx, MemProfilingInterval, 500, \
1989 "Time between each invocation of the MemProfiler") \
1990 \
1991 develop(intx, MallocCatchPtr, -1, \
1992 "Hit breakpoint when mallocing/freeing this pointer") \
1993 \
1994 notproduct(ccstrlist, SuppressErrorAt, "", \
1995 "List of assertions (file:line) to muzzle") \
1996 \
1997 develop(intx, StackPrintLimit, 100, \
1998 "number of stack frames to print in VM-level stack dump") \
1999 \
2000 notproduct(intx, MaxElementPrintSize, 256, \
2001 "maximum number of elements to print") \
2002 \
2003 notproduct(intx, MaxSubklassPrintSize, 4, \
2004 "maximum number of subklasses to print when printing klass") \
2005 \
2006 product(intx, MaxInlineLevel, 9, \
2007 "maximum number of nested calls that are inlined") \
2008 range(0, max_jint) \
2009 \
2010 product(intx, MaxRecursiveInlineLevel, 1, \
2011 "maximum number of nested recursive calls that are inlined") \
2012 range(0, max_jint) \
2013 \
2014 develop(intx, MaxForceInlineLevel, 100, \
2015 "maximum number of nested calls that are forced for inlining " \
2016 "(using CompileCommand or marked w/ @ForceInline)") \
2017 range(0, max_jint) \
2018 \
2019 product_pd(intx, InlineSmallCode, \
2020 "Only inline already compiled methods if their code size is " \
2021 "less than this") \
2022 range(0, max_jint) \
2023 \
2024 product(intx, MaxInlineSize, 35, \
2025 "The maximum bytecode size of a method to be inlined") \
2026 range(0, max_jint) \
2027 \
2028 product_pd(intx, FreqInlineSize, \
2029 "The maximum bytecode size of a frequent method to be inlined") \
2030 range(0, max_jint) \
2031 \
2032 product(intx, MaxTrivialSize, 6, \
2033 "The maximum bytecode size of a trivial method to be inlined") \
2034 range(0, max_jint) \
2035 \
2036 product(intx, MinInliningThreshold, 250, \
2037 "The minimum invocation count a method needs to have to be " \
2038 "inlined") \
2039 range(0, max_jint) \
2040 \
2041 develop(intx, MethodHistogramCutoff, 100, \
2042 "The cutoff value for method invocation histogram (+CountCalls)") \
2043 \
2044 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
2045 "Number of interpreted methods to show in profile") \
2046 \
2047 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
2048 "Number of compiled methods to show in profile") \
2049 \
2050 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
2051 "Number of stub methods to show in profile") \
2052 \
2053 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2054 "Number of runtime stub nodes to show in profile") \
2055 \
2056 product(intx, ProfileIntervalsTicks, 100, \
2057 "Number of ticks between printing of interval profile " \
2058 "(+ProfileIntervals)") \
2059 range(0, max_intx) \
2060 \
2061 develop(intx, DontYieldALotInterval, 10, \
2062 "Interval between which yields will be dropped (milliseconds)") \
2063 \
2064 develop(intx, ProfilerPCTickThreshold, 15, \
2065 "Number of ticks in a PC buckets to be a hotspot") \
2066 \
2067 notproduct(intx, DeoptimizeALotInterval, 5, \
2068 "Number of exits until DeoptimizeALot kicks in") \
2069 \
2070 notproduct(intx, ZombieALotInterval, 5, \
2071 "Number of exits until ZombieALot kicks in") \
2072 \
2073 diagnostic(uintx, MallocMaxTestWords, 0, \
2074 "If non-zero, maximum number of words that malloc/realloc can " \
2075 "allocate (for testing only)") \
2076 range(0, max_uintx) \
2077 \
2078 product(intx, TypeProfileWidth, 2, \
2079 "Number of receiver types to record in call/cast profile") \
2080 range(0, 8) \
2081 \
2082 develop(intx, BciProfileWidth, 2, \
2083 "Number of return bci's to record in ret profile") \
2084 \
2085 product(intx, PerMethodRecompilationCutoff, 400, \
2086 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2087 range(-1, max_intx) \
2088 \
2089 product(intx, PerBytecodeRecompilationCutoff, 200, \
2090 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2091 range(-1, max_intx) \
2092 \
2093 product(intx, PerMethodTrapLimit, 100, \
2094 "Limit on traps (of one kind) in a method (includes inlines)") \
2095 range(0, max_jint) \
2096 \
2097 experimental(intx, PerMethodSpecTrapLimit, 5000, \
2098 "Limit on speculative traps (of one kind) in a method " \
2099 "(includes inlines)") \
2100 range(0, max_jint) \
2101 \
2102 product(intx, PerBytecodeTrapLimit, 4, \
2103 "Limit on traps (of one kind) at a particular BCI") \
2104 range(0, max_jint) \
2105 \
2106 experimental(intx, SpecTrapLimitExtraEntries, 3, \
2107 "Extra method data trap entries for speculation") \
2108 \
2109 develop(intx, InlineFrequencyRatio, 20, \
2110 "Ratio of call site execution to caller method invocation") \
2111 range(0, max_jint) \
2112 \
2113 diagnostic_pd(intx, InlineFrequencyCount, \
2114 "Count of call site execution necessary to trigger frequent " \
2115 "inlining") \
2116 range(0, max_jint) \
2117 \
2118 develop(intx, InlineThrowCount, 50, \
2119 "Force inlining of interpreted methods that throw this often") \
2120 range(0, max_jint) \
2121 \
2122 develop(intx, InlineThrowMaxSize, 200, \
2123 "Force inlining of throwing methods smaller than this") \
2124 range(0, max_jint) \
2125 \
2126 develop(intx, ProfilerNodeSize, 1024, \
2127 "Size in K to allocate for the Profile Nodes of each thread") \
2128 range(0, 1024) \
2129 \
2130 product_pd(size_t, MetaspaceSize, \
2131 "Initial threshold (in bytes) at which a garbage collection " \
2132 "is done to reduce Metaspace usage") \
2133 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
2134 \
2135 product(size_t, MaxMetaspaceSize, max_uintx, \
2136 "Maximum size of Metaspaces (in bytes)") \
2137 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
2138 \
2139 product(size_t, CompressedClassSpaceSize, 1*G, \
2140 "Maximum size of class area in Metaspace when compressed " \
2141 "class pointers are used") \
2142 range(1*M, 3*G) \
2143 \
2144 manageable(uintx, MinHeapFreeRatio, 40, \
2145 "The minimum percentage of heap free after GC to avoid expansion."\
2146 " For most GCs this applies to the old generation. In G1 and" \
2147 " ParallelGC it applies to the whole heap.") \
2148 range(0, 100) \
2149 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
2150 \
2151 manageable(uintx, MaxHeapFreeRatio, 70, \
2152 "The maximum percentage of heap free after GC to avoid shrinking."\
2153 " For most GCs this applies to the old generation. In G1 and" \
2154 " ParallelGC it applies to the whole heap.") \
2155 range(0, 100) \
2156 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
2157 \
2158 product(bool, ShrinkHeapInSteps, true, \
2159 "When disabled, informs the GC to shrink the java heap directly" \
2160 " to the target size at the next full GC rather than requiring" \
2161 " smaller steps during multiple full GCs.") \
2162 \
2163 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
2164 "Number of milliseconds per MB of free space in the heap") \
2165 range(0, max_intx) \
2166 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
2167 \
2168 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
2169 "The minimum change in heap space due to GC (in bytes)") \
2170 range(0, max_uintx) \
2171 \
2172 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
2173 "The minimum expansion of Metaspace (in bytes)") \
2174 range(0, max_uintx) \
2175 \
2176 product(uintx, MaxMetaspaceFreeRatio, 70, \
2177 "The maximum percentage of Metaspace free after GC to avoid " \
2178 "shrinking") \
2179 range(0, 100) \
2180 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
2181 \
2182 product(uintx, MinMetaspaceFreeRatio, 40, \
2183 "The minimum percentage of Metaspace free after GC to avoid " \
2184 "expansion") \
2185 range(0, 99) \
2186 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
2187 \
2188 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
2189 "The maximum expansion of Metaspace without full GC (in bytes)") \
2190 range(0, max_uintx) \
2191 \
2192 /* stack parameters */ \
2193 product_pd(intx, StackYellowPages, \
2194 "Number of yellow zone (recoverable overflows) pages of size " \
2195 "4KB. If pages are bigger yellow zone is aligned up.") \
2196 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
2197 \
2198 product_pd(intx, StackRedPages, \
2199 "Number of red zone (unrecoverable overflows) pages of size " \
2200 "4KB. If pages are bigger red zone is aligned up.") \
2201 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
2202 \
2203 product_pd(intx, StackReservedPages, \
2204 "Number of reserved zone (reserved to annotated methods) pages" \
2205 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
2206 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
2207 \
2208 product(bool, RestrictReservedStack, true, \
2209 "Restrict @ReservedStackAccess to trusted classes") \
2210 \
2211 /* greater stack shadow pages can't generate instruction to bang stack */ \
2212 product_pd(intx, StackShadowPages, \
2213 "Number of shadow zone (for overflow checking) pages of size " \
2214 "4KB. If pages are bigger shadow zone is aligned up. " \
2215 "This should exceed the depth of the VM and native call stack.") \
2216 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
2217 \
2218 product_pd(intx, ThreadStackSize, \
2219 "Thread Stack Size (in Kbytes)") \
2220 range(0, 1 * M) \
2221 \
2222 product_pd(intx, VMThreadStackSize, \
2223 "Non-Java Thread Stack Size (in Kbytes)") \
2224 range(0, max_intx/(1 * K)) \
2225 \
2226 product_pd(intx, CompilerThreadStackSize, \
2227 "Compiler Thread Stack Size (in Kbytes)") \
2228 range(0, max_intx/(1 * K)) \
2229 \
2230 develop_pd(size_t, JVMInvokeMethodSlack, \
2231 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
2232 \
2233 /* code cache parameters */ \
2234 develop_pd(uintx, CodeCacheSegmentSize, \
2235 "Code cache segment size (in bytes) - smallest unit of " \
2236 "allocation") \
2237 range(1, 1024) \
2238 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
2239 \
2240 develop_pd(intx, CodeEntryAlignment, \
2241 "Code entry alignment for generated code (in bytes)") \
2242 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
2243 \
2244 product_pd(intx, OptoLoopAlignment, \
2245 "Align inner loops to zero relative to this modulus") \
2246 range(1, 16) \
2247 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
2248 \
2249 product_pd(uintx, InitialCodeCacheSize, \
2250 "Initial code cache size (in bytes)") \
2251 range(os::vm_page_size(), max_uintx) \
2252 \
2253 develop_pd(uintx, CodeCacheMinimumUseSpace, \
2254 "Minimum code cache size (in bytes) required to start VM.") \
2255 range(0, max_uintx) \
2256 \
2257 product(bool, SegmentedCodeCache, false, \
2258 "Use a segmented code cache") \
2259 \
2260 product_pd(uintx, ReservedCodeCacheSize, \
2261 "Reserved code cache size (in bytes) - maximum code cache size") \
2262 range(os::vm_page_size(), max_uintx) \
2263 \
2264 product_pd(uintx, NonProfiledCodeHeapSize, \
2265 "Size of code heap with non-profiled methods (in bytes)") \
2266 range(0, max_uintx) \
2267 \
2268 product_pd(uintx, ProfiledCodeHeapSize, \
2269 "Size of code heap with profiled methods (in bytes)") \
2270 range(0, max_uintx) \
2271 \
2272 product_pd(uintx, NonNMethodCodeHeapSize, \
2273 "Size of code heap with non-nmethods (in bytes)") \
2274 range(os::vm_page_size(), max_uintx) \
2275 \
2276 product_pd(uintx, CodeCacheExpansionSize, \
2277 "Code cache expansion size (in bytes)") \
2278 range(32*K, max_uintx) \
2279 \
2280 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
2281 "Minimum number of segments in a code cache block") \
2282 range(1, 100) \
2283 \
2284 notproduct(bool, ExitOnFullCodeCache, false, \
2285 "Exit the VM if we fill the code cache") \
2286 \
2287 product(bool, UseCodeCacheFlushing, true, \
2288 "Remove cold/old nmethods from the code cache") \
2289 \
2290 product(uintx, StartAggressiveSweepingAt, 10, \
2291 "Start aggressive sweeping if X[%] of the code cache is free." \
2292 "Segmented code cache: X[%] of the non-profiled heap." \
2293 "Non-segmented code cache: X[%] of the total code cache") \
2294 range(0, 100) \
2295 \
2296 /* AOT parameters */ \
2297 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \
2298 "Use AOT compiled files") \
2299 \
2300 product(ccstrlist, AOTLibrary, NULL, \
2301 "AOT library") \
2302 \
2303 product(bool, PrintAOT, false, \
2304 "Print used AOT klasses and methods") \
2305 \
2306 notproduct(bool, PrintAOTStatistics, false, \
2307 "Print AOT statistics") \
2308 \
2309 diagnostic(bool, UseAOTStrictLoading, false, \
2310 "Exit the VM if any of the AOT libraries has invalid config") \
2311 \
2312 product(bool, CalculateClassFingerprint, false, \
2313 "Calculate class fingerprint") \
2314 \
2315 /* interpreter debugging */ \
2316 develop(intx, BinarySwitchThreshold, 5, \
2317 "Minimal number of lookupswitch entries for rewriting to binary " \
2318 "switch") \
2319 \
2320 develop(intx, StopInterpreterAt, 0, \
2321 "Stop interpreter execution at specified bytecode number") \
2322 \
2323 develop(intx, TraceBytecodesAt, 0, \
2324 "Trace bytecodes starting with specified bytecode number") \
2325 \
2326 /* compiler interface */ \
2327 develop(intx, CIStart, 0, \
2328 "The id of the first compilation to permit") \
2329 \
2330 develop(intx, CIStop, max_jint, \
2331 "The id of the last compilation to permit") \
2332 \
2333 develop(intx, CIStartOSR, 0, \
2334 "The id of the first osr compilation to permit " \
2335 "(CICountOSR must be on)") \
2336 \
2337 develop(intx, CIStopOSR, max_jint, \
2338 "The id of the last osr compilation to permit " \
2339 "(CICountOSR must be on)") \
2340 \
2341 develop(intx, CIBreakAtOSR, -1, \
2342 "The id of osr compilation to break at") \
2343 \
2344 develop(intx, CIBreakAt, -1, \
2345 "The id of compilation to break at") \
2346 \
2347 product(ccstrlist, CompileOnly, "", \
2348 "List of methods (pkg/class.name) to restrict compilation to") \
2349 \
2350 product(ccstr, CompileCommandFile, NULL, \
2351 "Read compiler commands from this file [.hotspot_compiler]") \
2352 \
2353 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
2354 "Read compiler directives from this file") \
2355 \
2356 product(ccstrlist, CompileCommand, "", \
2357 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2358 \
2359 develop(bool, ReplayCompiles, false, \
2360 "Enable replay of compilations from ReplayDataFile") \
2361 \
2362 product(ccstr, ReplayDataFile, NULL, \
2363 "File containing compilation replay information" \
2364 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
2365 \
2366 product(ccstr, InlineDataFile, NULL, \
2367 "File containing inlining replay information" \
2368 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
2369 \
2370 develop(intx, ReplaySuppressInitializers, 2, \
2371 "Control handling of class initialization during replay: " \
2372 "0 - don't do anything special; " \
2373 "1 - treat all class initializers as empty; " \
2374 "2 - treat class initializers for application classes as empty; " \
2375 "3 - allow all class initializers to run during bootstrap but " \
2376 " pretend they are empty after starting replay") \
2377 range(0, 3) \
2378 \
2379 develop(bool, ReplayIgnoreInitErrors, false, \
2380 "Ignore exceptions thrown during initialization for replay") \
2381 \
2382 product(bool, DumpReplayDataOnError, true, \
2383 "Record replay data for crashing compiler threads") \
2384 \
2385 product(bool, CICompilerCountPerCPU, false, \
2386 "1 compiler thread for log(N CPUs)") \
2387 \
2388 develop(intx, CIFireOOMAt, -1, \
2389 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
2390 "(non-negative value throws OOM after this many CI accesses " \
2391 "in each compile)") \
2392 notproduct(intx, CICrashAt, -1, \
2393 "id of compilation to trigger assert in compiler thread for " \
2394 "the purpose of testing, e.g. generation of replay data") \
2395 notproduct(bool, CIObjectFactoryVerify, false, \
2396 "enable potentially expensive verification in ciObjectFactory") \
2397 \
2398 /* Priorities */ \
2399 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
2400 \
2401 product(intx, ThreadPriorityPolicy, 0, \
2402 "0 : Normal. "\
2403 " VM chooses priorities that are appropriate for normal "\
2404 " applications. On Solaris NORM_PRIORITY and above are mapped "\
2405 " to normal native priority. Java priorities below " \
2406 " NORM_PRIORITY map to lower native priority values. On "\
2407 " Windows applications are allowed to use higher native "\
2408 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
2409 " not use the highest possible native priority, "\
2410 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
2411 " system threads. On Linux thread priorities are ignored "\
2412 " because the OS does not support static priority in "\
2413 " SCHED_OTHER scheduling class which is the only choice for "\
2414 " non-root, non-realtime applications. "\
2415 "1 : Aggressive. "\
2416 " Java thread priorities map over to the entire range of "\
2417 " native thread priorities. Higher Java thread priorities map "\
2418 " to higher native thread priorities. This policy should be "\
2419 " used with care, as sometimes it can cause performance "\
2420 " degradation in the application and/or the entire system. On "\
2421 " Linux this policy requires root privilege.") \
2422 range(0, 1) \
2423 \
2424 product(bool, ThreadPriorityVerbose, false, \
2425 "Print priority changes") \
2426 \
2427 product(intx, CompilerThreadPriority, -1, \
2428 "The native priority at which compiler threads should run " \
2429 "(-1 means no change)") \
2430 range(min_jint, max_jint) \
2431 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
2432 \
2433 product(intx, VMThreadPriority, -1, \
2434 "The native priority at which the VM thread should run " \
2435 "(-1 means no change)") \
2436 range(-1, 127) \
2437 \
2438 product(bool, CompilerThreadHintNoPreempt, false, \
2439 "(Solaris only) Give compiler threads an extra quanta") \
2440 \
2441 product(bool, VMThreadHintNoPreempt, false, \
2442 "(Solaris only) Give VM thread an extra quanta") \
2443 \
2444 product(intx, JavaPriority1_To_OSPriority, -1, \
2445 "Map Java priorities to OS priorities") \
2446 range(-1, 127) \
2447 \
2448 product(intx, JavaPriority2_To_OSPriority, -1, \
2449 "Map Java priorities to OS priorities") \
2450 range(-1, 127) \
2451 \
2452 product(intx, JavaPriority3_To_OSPriority, -1, \
2453 "Map Java priorities to OS priorities") \
2454 range(-1, 127) \
2455 \
2456 product(intx, JavaPriority4_To_OSPriority, -1, \
2457 "Map Java priorities to OS priorities") \
2458 range(-1, 127) \
2459 \
2460 product(intx, JavaPriority5_To_OSPriority, -1, \
2461 "Map Java priorities to OS priorities") \
2462 range(-1, 127) \
2463 \
2464 product(intx, JavaPriority6_To_OSPriority, -1, \
2465 "Map Java priorities to OS priorities") \
2466 range(-1, 127) \
2467 \
2468 product(intx, JavaPriority7_To_OSPriority, -1, \
2469 "Map Java priorities to OS priorities") \
2470 range(-1, 127) \
2471 \
2472 product(intx, JavaPriority8_To_OSPriority, -1, \
2473 "Map Java priorities to OS priorities") \
2474 range(-1, 127) \
2475 \
2476 product(intx, JavaPriority9_To_OSPriority, -1, \
2477 "Map Java priorities to OS priorities") \
2478 range(-1, 127) \
2479 \
2480 product(intx, JavaPriority10_To_OSPriority,-1, \
2481 "Map Java priorities to OS priorities") \
2482 range(-1, 127) \
2483 \
2484 experimental(bool, UseCriticalJavaThreadPriority, false, \
2485 "Java thread priority 10 maps to critical scheduling priority") \
2486 \
2487 experimental(bool, UseCriticalCompilerThreadPriority, false, \
2488 "Compiler thread(s) run at critical scheduling priority") \
2489 \
2490 experimental(bool, UseCriticalCMSThreadPriority, false, \
2491 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
2492 \
2493 /* compiler debugging */ \
2494 notproduct(intx, CompileTheWorldStartAt, 1, \
2495 "First class to consider when using +CompileTheWorld") \
2496 \
2497 notproduct(intx, CompileTheWorldStopAt, max_jint, \
2498 "Last class to consider when using +CompileTheWorld") \
2499 \
2500 develop(intx, NewCodeParameter, 0, \
2501 "Testing Only: Create a dedicated integer parameter before " \
2502 "putback") \
2503 \
2504 /* new oopmap storage allocation */ \
2505 develop(intx, MinOopMapAllocation, 8, \
2506 "Minimum number of OopMap entries in an OopMapSet") \
2507 \
2508 /* Background Compilation */ \
2509 develop(intx, LongCompileThreshold, 50, \
2510 "Used with +TraceLongCompiles") \
2511 \
2512 /* recompilation */ \
2513 product_pd(intx, CompileThreshold, \
2514 "number of interpreted method invocations before (re-)compiling") \
2515 constraint(CompileThresholdConstraintFunc, AfterErgo) \
2516 \
2517 product(double, CompileThresholdScaling, 1.0, \
2518 "Factor to control when first compilation happens " \
2519 "(both with and without tiered compilation): " \
2520 "values greater than 1.0 delay counter overflow, " \
2521 "values between 0 and 1.0 rush counter overflow, " \
2522 "value of 1.0 leaves compilation thresholds unchanged " \
2523 "value of 0.0 is equivalent to -Xint. " \
2524 "" \
2525 "Flag can be set as per-method option. " \
2526 "If a value is specified for a method, compilation thresholds " \
2527 "for that method are scaled by both the value of the global flag "\
2528 "and the value of the per-method flag.") \
2529 range(0.0, DBL_MAX) \
2530 \
2531 product(intx, Tier0InvokeNotifyFreqLog, 7, \
2532 "Interpreter (tier 0) invocation notification frequency") \
2533 range(0, 30) \
2534 \
2535 product(intx, Tier2InvokeNotifyFreqLog, 11, \
2536 "C1 without MDO (tier 2) invocation notification frequency") \
2537 range(0, 30) \
2538 \
2539 product(intx, Tier3InvokeNotifyFreqLog, 10, \
2540 "C1 with MDO profiling (tier 3) invocation notification " \
2541 "frequency") \
2542 range(0, 30) \
2543 \
2544 product(intx, Tier23InlineeNotifyFreqLog, 20, \
2545 "Inlinee invocation (tiers 2 and 3) notification frequency") \
2546 range(0, 30) \
2547 \
2548 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
2549 "Interpreter (tier 0) invocation notification frequency") \
2550 range(0, 30) \
2551 \
2552 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
2553 "C1 without MDO (tier 2) invocation notification frequency") \
2554 range(0, 30) \
2555 \
2556 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
2557 "C1 with MDO profiling (tier 3) invocation notification " \
2558 "frequency") \
2559 range(0, 30) \
2560 \
2561 product(intx, Tier2CompileThreshold, 0, \
2562 "threshold at which tier 2 compilation is invoked") \
2563 range(0, max_jint) \
2564 \
2565 product(intx, Tier2BackEdgeThreshold, 0, \
2566 "Back edge threshold at which tier 2 compilation is invoked") \
2567 range(0, max_jint) \
2568 \
2569 product(intx, Tier3InvocationThreshold, 200, \
2570 "Compile if number of method invocations crosses this " \
2571 "threshold") \
2572 range(0, max_jint) \
2573 \
2574 product(intx, Tier3MinInvocationThreshold, 100, \
2575 "Minimum invocation to compile at tier 3") \
2576 range(0, max_jint) \
2577 \
2578 product(intx, Tier3CompileThreshold, 2000, \
2579 "Threshold at which tier 3 compilation is invoked (invocation " \
2580 "minimum must be satisfied)") \
2581 range(0, max_jint) \
2582 \
2583 product(intx, Tier3BackEdgeThreshold, 60000, \
2584 "Back edge threshold at which tier 3 OSR compilation is invoked") \
2585 range(0, max_jint) \
2586 \
2587 product(intx, Tier3AOTInvocationThreshold, 10000, \
2588 "Compile if number of method invocations crosses this " \
2589 "threshold if coming from AOT") \
2590 range(0, max_jint) \
2591 \
2592 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
2593 "Minimum invocation to compile at tier 3 if coming from AOT") \
2594 range(0, max_jint) \
2595 \
2596 product(intx, Tier3AOTCompileThreshold, 15000, \
2597 "Threshold at which tier 3 compilation is invoked (invocation " \
2598 "minimum must be satisfied) if coming from AOT") \
2599 range(0, max_jint) \
2600 \
2601 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
2602 "Back edge threshold at which tier 3 OSR compilation is invoked " \
2603 "if coming from AOT") \
2604 range(0, max_jint) \
2605 \
2606 product(intx, Tier4InvocationThreshold, 5000, \
2607 "Compile if number of method invocations crosses this " \
2608 "threshold") \
2609 range(0, max_jint) \
2610 \
2611 product(intx, Tier4MinInvocationThreshold, 600, \
2612 "Minimum invocation to compile at tier 4") \
2613 range(0, max_jint) \
2614 \
2615 product(intx, Tier4CompileThreshold, 15000, \
2616 "Threshold at which tier 4 compilation is invoked (invocation " \
2617 "minimum must be satisfied") \
2618 range(0, max_jint) \
2619 \
2620 product(intx, Tier4BackEdgeThreshold, 40000, \
2621 "Back edge threshold at which tier 4 OSR compilation is invoked") \
2622 range(0, max_jint) \
2623 \
2624 product(intx, Tier3DelayOn, 5, \
2625 "If C2 queue size grows over this amount per compiler thread " \
2626 "stop compiling at tier 3 and start compiling at tier 2") \
2627 range(0, max_jint) \
2628 \
2629 product(intx, Tier3DelayOff, 2, \
2630 "If C2 queue size is less than this amount per compiler thread " \
2631 "allow methods compiled at tier 2 transition to tier 3") \
2632 range(0, max_jint) \
2633 \
2634 product(intx, Tier3LoadFeedback, 5, \
2635 "Tier 3 thresholds will increase twofold when C1 queue size " \
2636 "reaches this amount per compiler thread") \
2637 range(0, max_jint) \
2638 \
2639 product(intx, Tier4LoadFeedback, 3, \
2640 "Tier 4 thresholds will increase twofold when C2 queue size " \
2641 "reaches this amount per compiler thread") \
2642 range(0, max_jint) \
2643 \
2644 product(intx, TieredCompileTaskTimeout, 50, \
2645 "Kill compile task if method was not used within " \
2646 "given timeout in milliseconds") \
2647 range(0, max_intx) \
2648 \
2649 product(intx, TieredStopAtLevel, 4, \
2650 "Stop at given compilation level") \
2651 range(0, 4) \
2652 \
2653 product(intx, Tier0ProfilingStartPercentage, 200, \
2654 "Start profiling in interpreter if the counters exceed tier 3 " \
2655 "thresholds by the specified percentage") \
2656 range(0, max_jint) \
2657 \
2658 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
2659 "Increase the compile threshold for C1 compilation if the code " \
2660 "cache is filled by the specified percentage") \
2661 range(0, 99) \
2662 \
2663 product(intx, TieredRateUpdateMinTime, 1, \
2664 "Minimum rate sampling interval (in milliseconds)") \
2665 range(0, max_intx) \
2666 \
2667 product(intx, TieredRateUpdateMaxTime, 25, \
2668 "Maximum rate sampling interval (in milliseconds)") \
2669 range(0, max_intx) \
2670 \
2671 product_pd(bool, TieredCompilation, \
2672 "Enable tiered compilation") \
2673 \
2674 product(bool, PrintTieredEvents, false, \
2675 "Print tiered events notifications") \
2676 \
2677 product_pd(intx, OnStackReplacePercentage, \
2678 "NON_TIERED number of method invocations/branches (expressed as " \
2679 "% of CompileThreshold) before (re-)compiling OSR code") \
2680 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
2681 \
2682 product(intx, InterpreterProfilePercentage, 33, \
2683 "NON_TIERED number of method invocations/branches (expressed as " \
2684 "% of CompileThreshold) before profiling in the interpreter") \
2685 range(0, 100) \
2686 \
2687 develop(intx, MaxRecompilationSearchLength, 10, \
2688 "The maximum number of frames to inspect when searching for " \
2689 "recompilee") \
2690 \
2691 develop(intx, MaxInterpretedSearchLength, 3, \
2692 "The maximum number of interpreted frames to skip when searching "\
2693 "for recompilee") \
2694 \
2695 develop(intx, DesiredMethodLimit, 8000, \
2696 "The desired maximum method size (in bytecodes) after inlining") \
2697 \
2698 develop(intx, HugeMethodLimit, 8000, \
2699 "Don't compile methods larger than this if " \
2700 "+DontCompileHugeMethods") \
2701 \
2702 /* New JDK 1.4 reflection implementation */ \
2703 \
2704 develop(intx, FastSuperclassLimit, 8, \
2705 "Depth of hardwired instanceof accelerator array") \
2706 \
2707 /* Properties for Java libraries */ \
2708 \
2709 product(uint64_t, MaxDirectMemorySize, 0, \
2710 "Maximum total size of NIO direct-buffer allocations") \
2711 range(0, max_jlong) \
2712 \
2713 /* Flags used for temporary code during development */ \
2714 \
2715 diagnostic(bool, UseNewCode, false, \
2716 "Testing Only: Use the new version while testing") \
2717 \
2718 diagnostic(bool, UseNewCode2, false, \
2719 "Testing Only: Use the new version while testing") \
2720 \
2721 diagnostic(bool, UseNewCode3, false, \
2722 "Testing Only: Use the new version while testing") \
2723 \
2724 /* flags for performance data collection */ \
2725 \
2726 product(bool, UsePerfData, true, \
2727 "Flag to disable jvmstat instrumentation for performance testing "\
2728 "and problem isolation purposes") \
2729 \
2730 product(bool, PerfDataSaveToFile, false, \
2731 "Save PerfData memory to hsperfdata_<pid> file on exit") \
2732 \
2733 product(ccstr, PerfDataSaveFile, NULL, \
2734 "Save PerfData memory to the specified absolute pathname. " \
2735 "The string %p in the file name (if present) " \
2736 "will be replaced by pid") \
2737 \
2738 product(intx, PerfDataSamplingInterval, 50, \
2739 "Data sampling interval (in milliseconds)") \
2740 range(PeriodicTask::min_interval, max_jint) \
2741 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
2742 \
2743 product(bool, PerfDisableSharedMem, false, \
2744 "Store performance data in standard memory") \
2745 \
2746 product(intx, PerfDataMemorySize, 32*K, \
2747 "Size of performance data memory region. Will be rounded " \
2748 "up to a multiple of the native os page size.") \
2749 range(128, 32*64*K) \
2750 \
2751 product(intx, PerfMaxStringConstLength, 1024, \
2752 "Maximum PerfStringConstant string length before truncation") \
2753 range(32, 32*K) \
2754 \
2755 product(bool, PerfAllowAtExitRegistration, false, \
2756 "Allow registration of atexit() methods") \
2757 \
2758 product(bool, PerfBypassFileSystemCheck, false, \
2759 "Bypass Win32 file system criteria checks (Windows Only)") \
2760 \
2761 product(intx, UnguardOnExecutionViolation, 0, \
2762 "Unguard page and retry on no-execute fault (Win32 only) " \
2763 "0=off, 1=conservative, 2=aggressive") \
2764 range(0, 2) \
2765 \
2766 /* Serviceability Support */ \
2767 \
2768 product(bool, ManagementServer, false, \
2769 "Create JMX Management Server") \
2770 \
2771 product(bool, DisableAttachMechanism, false, \
2772 "Disable mechanism that allows tools to attach to this VM") \
2773 \
2774 product(bool, StartAttachListener, false, \
2775 "Always start Attach Listener at VM startup") \
2776 \
2777 product(bool, EnableDynamicAgentLoading, true, \
2778 "Allow tools to load agents with the attach mechanism") \
2779 \
2780 manageable(bool, PrintConcurrentLocks, false, \
2781 "Print java.util.concurrent locks in thread dump") \
2782 \
2783 product(bool, TransmitErrorReport, false, \
2784 "Enable error report transmission on erroneous termination") \
2785 \
2786 product(ccstr, ErrorReportServer, NULL, \
2787 "Override built-in error report server address") \
2788 \
2789 /* Shared spaces */ \
2790 \
2791 product(bool, UseSharedSpaces, true, \
2792 "Use shared spaces for metadata") \
2793 \
2794 product(bool, VerifySharedSpaces, false, \
2795 "Verify shared spaces (false for default archive, true for " \
2796 "archive specified by -XX:SharedArchiveFile)") \
2797 \
2798 product(bool, RequireSharedSpaces, false, \
2799 "Require shared spaces for metadata") \
2800 \
2801 product(bool, DumpSharedSpaces, false, \
2802 "Special mode: JVM reads a class list, loads classes, builds " \
2803 "shared spaces, and dumps the shared spaces to a file to be " \
2804 "used in future JVM runs") \
2805 \
2806 product(bool, PrintSharedArchiveAndExit, false, \
2807 "Print shared archive file contents") \
2808 \
2809 product(bool, PrintSharedDictionary, false, \
2810 "If PrintSharedArchiveAndExit is true, also print the shared " \
2811 "dictionary") \
2812 \
2813 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
2814 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
2815 "Address to allocate shared memory region for class data") \
2816 range(0, SIZE_MAX) \
2817 \
2818 product(bool, UseAppCDS, false, \
2819 "Enable Application Class Data Sharing when using shared spaces") \
2820 writeable(CommandLineOnly) \
2821 \
2822 product(ccstr, SharedArchiveConfigFile, NULL, \
2823 "Data to add to the CDS archive file") \
2824 \
2825 product(uintx, SharedSymbolTableBucketSize, 4, \
2826 "Average number of symbols per bucket in shared table") \
2827 range(2, 246) \
2828 \
2829 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \
2830 "Do not quit -Xshare:dump even if we encounter unverifiable " \
2831 "classes. Just exclude them from the shared dictionary.") \
2832 \
2833 diagnostic(bool, PrintMethodHandleStubs, false, \
2834 "Print generated stub code for method handles") \
2835 \
2836 develop(bool, TraceMethodHandles, false, \
2837 "trace internal method handle operations") \
2838 \
2839 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
2840 "perform extra checks when constructing method handles") \
2841 \
2842 diagnostic(bool, ShowHiddenFrames, false, \
2843 "show method handle implementation frames (usually hidden)") \
2844 \
2845 experimental(bool, TrustFinalNonStaticFields, false, \
2846 "trust final non-static declarations for constant folding") \
2847 \
2848 diagnostic(bool, FoldStableValues, true, \
2849 "Optimize loads from stable fields (marked w/ @Stable)") \
2850 \
2851 develop(bool, TraceInvokeDynamic, false, \
2852 "trace internal invoke dynamic operations") \
2853 \
2854 diagnostic(int, UseBootstrapCallInfo, 1, \
2855 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2856 "resolved before the bootstrap method is called; 1: when a BSM " \
2857 "that may accept a BootstrapCallInfo is detected, use that API " \
2858 "to pass BSM arguments, which allows the BSM to delay their " \
2859 "resolution; 2+: stress test the BCI API by calling more BSMs " \
2860 "via that API, instead of with the eagerly-resolved array.") \
2861 \
2862 diagnostic(bool, PauseAtStartup, false, \
2863 "Causes the VM to pause at startup time and wait for the pause " \
2864 "file to be removed (default: ./vm.paused.<pid>)") \
2865 \
2866 diagnostic(ccstr, PauseAtStartupFile, NULL, \
2867 "The file to create and for whose removal to await when pausing " \
2868 "at startup. (default: ./vm.paused.<pid>)") \
2869 \
2870 diagnostic(bool, PauseAtExit, false, \
2871 "Pause and wait for keypress on exit if a debugger is attached") \
2872 \
2873 product(bool, ExtendedDTraceProbes, false, \
2874 "Enable performance-impacting dtrace probes") \
2875 \
2876 product(bool, DTraceMethodProbes, false, \
2877 "Enable dtrace probes for method-entry and method-exit") \
2878 \
2879 product(bool, DTraceAllocProbes, false, \
2880 "Enable dtrace probes for object allocation") \
2881 \
2882 product(bool, DTraceMonitorProbes, false, \
2883 "Enable dtrace probes for monitor events") \
2884 \
2885 product(bool, RelaxAccessControlCheck, false, \
2886 "Relax the access control checks in the verifier") \
2887 \
2888 product(uintx, StringTableSize, defaultStringTableSize, \
2889 "Number of buckets in the interned String table") \
2890 range(minimumStringTableSize, 111*defaultStringTableSize) \
2891 \
2892 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
2893 "Number of buckets in the JVM internal Symbol table") \
2894 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
2895 \
2896 product(bool, UseStringDeduplication, false, \
2897 "Use string deduplication") \
2898 \
2899 product(uintx, StringDeduplicationAgeThreshold, 3, \
2900 "A string must reach this age (or be promoted to an old region) " \
2901 "to be considered for deduplication") \
2902 range(1, markOopDesc::max_age) \
2903 \
2904 diagnostic(bool, StringDeduplicationResizeALot, false, \
2905 "Force table resize every time the table is scanned") \
2906 \
2907 diagnostic(bool, StringDeduplicationRehashALot, false, \
2908 "Force table rehash every time the table is scanned") \
2909 \
2910 diagnostic(bool, WhiteBoxAPI, false, \
2911 "Enable internal testing APIs") \
2912 \
2913 experimental(intx, SurvivorAlignmentInBytes, 0, \
2914 "Default survivor space alignment in bytes") \
2915 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
2916 \
2917 product(bool , AllowNonVirtualCalls, false, \
2918 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
2919 \
2920 product(ccstr, DumpLoadedClassList, NULL, \
2921 "Dump the names all loaded classes, that could be stored into " \
2922 "the CDS archive, in the specified file") \
2923 \
2924 product(ccstr, SharedClassListFile, NULL, \
2925 "Override the default CDS class list") \
2926 \
2927 diagnostic(ccstr, SharedArchiveFile, NULL, \
2928 "Override the default location of the CDS archive file") \
2929 \
2930 product(ccstr, ExtraSharedClassListFile, NULL, \
2931 "Extra classlist for building the CDS archive file") \
2932 \
2933 experimental(size_t, ArrayAllocatorMallocLimit, \
2934 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
2935 "Allocation less than this value will be allocated " \
2936 "using malloc. Larger allocations will use mmap.") \
2937 \
2938 experimental(bool, AlwaysAtomicAccesses, false, \
2939 "Accesses to all variables should always be atomic") \
2940 \
2941 product(bool, EnableTracing, false, \
2942 "Enable event-based tracing") \
2943 \
2944 product(bool, UseLockedTracing, false, \
2945 "Use locked-tracing when doing event-based tracing") \
2946 \
2947 diagnostic(bool, UseUnalignedAccesses, false, \
2948 "Use unaligned memory accesses in Unsafe") \
2949 \
2950 product_pd(bool, PreserveFramePointer, \
2951 "Use the FP register for holding the frame pointer " \
2952 "and not as a general purpose register.") \
2953 \
2954 diagnostic(bool, CheckIntrinsics, true, \
2955 "When a class C is loaded, check that " \
2956 "(1) all intrinsics defined by the VM for class C are present "\
2957 "in the loaded class file and are marked with the " \
2958 "@HotSpotIntrinsicCandidate annotation, that " \
2959 "(2) there is an intrinsic registered for all loaded methods " \
2960 "that are annotated with the @HotSpotIntrinsicCandidate " \
2961 "annotation, and that " \
2962 "(3) no orphan methods exist for class C (i.e., methods for " \
2963 "which the VM declares an intrinsic but that are not declared "\
2964 "in the loaded class C. " \
2965 "Check (3) is available only in debug builds.") \
2966 \
2967 diagnostic_pd(intx, InitArrayShortSize, \
2968 "Threshold small size (in bytes) for clearing arrays. " \
2969 "Anything this size or smaller may get converted to discrete " \
2970 "scalar stores.") \
2971 range(0, max_intx) \
2972 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
2973 \
2974 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
2975 "Disable backwards compatibility for compile commands.") \
2976 \
2977 diagnostic(bool, CompilerDirectivesPrint, false, \
2978 "Print compiler directives on installation.") \
2979 diagnostic(int, CompilerDirectivesLimit, 50, \
2980 "Limit on number of compiler directives.") \
2981 \
2982 product(ccstr, AllocateHeapAt, NULL, \
2983 "Path to the directoy where a temporary file will be created " \
2984 "to use as the backing store for Java Heap.") \
2985 \
2986 develop(bool, VerifyMetaspace, false, \
2987 "Verify metaspace on chunk movements.") \
2988 \
2989 diagnostic(bool, ShowRegistersOnAssert, false, \
2990 "On internal errors, include registers in error report.") \
2991 \
2992 TRACE_ONLY(product(bool, FlightRecorder, false, \
2993 "Enable Flight Recorder")) \
2994 \
2995 TRACE_ONLY(product(ccstr, FlightRecorderOptions, NULL, \
2996 "Flight Recorder options")) \
2997 \
2998 TRACE_ONLY(product(ccstr, StartFlightRecording, NULL, \
2999 "Start flight recording with options")) \
3000 \
3001 experimental(bool, UseFastUnorderedTimeStamps, false, \
3002 "Use platform unstable time where supported for timestamps only")
3003
3004 #define VM_FLAGS(develop, \
3005 develop_pd, \
3006 product, \
3007 product_pd, \
3008 diagnostic, \
3009 diagnostic_pd, \
3010 experimental, \
3011 notproduct, \
3012 manageable, \
3013 product_rw, \
3014 lp64_product, \
3015 range, \
3016 constraint, \
3017 writeable) \
3018 \
3019 RUNTIME_FLAGS( \
3020 develop, \
3021 develop_pd, \
3022 product, \
3023 product_pd, \
3024 diagnostic, \
3025 diagnostic_pd, \
3026 experimental, \
3027 notproduct, \
3028 manageable, \
3029 product_rw, \
3030 lp64_product, \
3031 range, \
3032 constraint, \
3033 writeable) \
3034 \
3035 GC_FLAGS( \
3036 develop, \
3037 develop_pd, \
3038 product, \
3039 product_pd, \
3040 diagnostic, \
3041 diagnostic_pd, \
3042 experimental, \
3043 notproduct, \
3044 manageable, \
3045 product_rw, \
3046 lp64_product, \
3047 range, \
3048 constraint, \
3049 writeable) \
3050
3051 /*
3052 * Macros for factoring of globals
3053 */
3054
3055 // Interface macros
3056 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3057 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3058 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3059 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
3060 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3061 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3062 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3063 #ifdef PRODUCT
3064 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3065 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3066 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
3067 #else
3068 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3069 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3070 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3071 #endif // PRODUCT
3072 // Special LP64 flags, product only needed for now.
3073 #ifdef _LP64
3074 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3075 #else
3076 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3077 #endif // _LP64
3078
3079 // Implementation macros
3080 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3081 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3082 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3083 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name;
3084 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3085 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3086 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3087 #ifdef PRODUCT
3088 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
3089 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
3090 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3091 #else
3092 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3093 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3094 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3095 #endif // PRODUCT
3096 #ifdef _LP64
3097 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3098 #else
3099 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3100 #endif // _LP64
3101
3102 // Only materialize src code for range checking when required, ignore otherwise
3103 #define IGNORE_RANGE(a, b)
3104 // Only materialize src code for contraint checking when required, ignore otherwise
3105 #define IGNORE_CONSTRAINT(func,type)
3106
3107 #define IGNORE_WRITEABLE(type)
3108
3109 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \
3110 DECLARE_PD_DEVELOPER_FLAG, \
3111 DECLARE_PRODUCT_FLAG, \
3112 DECLARE_PD_PRODUCT_FLAG, \
3113 DECLARE_DIAGNOSTIC_FLAG, \
3114 DECLARE_PD_DIAGNOSTIC_FLAG, \
3115 DECLARE_EXPERIMENTAL_FLAG, \
3116 DECLARE_NOTPRODUCT_FLAG, \
3117 DECLARE_MANAGEABLE_FLAG, \
3118 DECLARE_PRODUCT_RW_FLAG, \
3119 DECLARE_LP64_PRODUCT_FLAG, \
3120 IGNORE_RANGE, \
3121 IGNORE_CONSTRAINT, \
3122 IGNORE_WRITEABLE)
3123
3124 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
3125 DECLARE_PD_DEVELOPER_FLAG, \
3126 DECLARE_PRODUCT_FLAG, \
3127 DECLARE_PD_PRODUCT_FLAG, \
3128 DECLARE_DIAGNOSTIC_FLAG, \
3129 DECLARE_PD_DIAGNOSTIC_FLAG, \
3130 DECLARE_NOTPRODUCT_FLAG, \
3131 IGNORE_RANGE, \
3132 IGNORE_CONSTRAINT, \
3133 IGNORE_WRITEABLE)
3134
3135 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
3136 DECLARE_PRODUCT_FLAG, \
3137 DECLARE_DIAGNOSTIC_FLAG, \
3138 DECLARE_EXPERIMENTAL_FLAG, \
3139 DECLARE_NOTPRODUCT_FLAG, \
3140 IGNORE_RANGE, \
3141 IGNORE_CONSTRAINT, \
3142 IGNORE_WRITEABLE)
3143
3144 // Extensions
3145
3146 #include "runtime/globals_ext.hpp"
3147
3148 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP