1 /*
2 * Copyright (c) 1997, 2014, 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 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 // Disable options not supported in this release, with a warning if they
61 // were explicitly requested on the command-line
62 #define UNSUPPORTED_OPTION(opt, description) \
63 do { \
64 if (opt) { \
65 if (FLAG_IS_CMDLINE(opt)) { \
66 warning(description " is disabled in this release."); \
67 } \
68 FLAG_SET_DEFAULT(opt, false); \
69 } \
70 } while(0)
71
72 #define UNSUPPORTED_GC_OPTION(gc) \
73 do { \
74 if (gc) { \
75 if (FLAG_IS_CMDLINE(gc)) { \
76 warning(#gc " is not supported in this VM. Using Serial GC."); \
77 } \
78 FLAG_SET_DEFAULT(gc, false); \
79 } \
80 } while(0)
81
82 char** Arguments::_jvm_flags_array = NULL;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = NULL;
85 int Arguments::_num_jvm_args = 0;
86 char* Arguments::_java_command = NULL;
87 SystemProperty* Arguments::_system_properties = NULL;
88 const char* Arguments::_gc_log_filename = NULL;
89 bool Arguments::_has_profile = false;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 uintx Arguments::_min_heap_size = 0;
92 uintx Arguments::_min_heap_free_ratio = 0;
93 uintx Arguments::_max_heap_free_ratio = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 bool Arguments::_java_compiler = false;
96 bool Arguments::_xdebug_mode = false;
97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 int Arguments::_sun_java_launcher_pid = -1;
100 bool Arguments::_sun_java_launcher_is_altjvm = false;
101
102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107
108 char* Arguments::SharedArchivePath = NULL;
109
110 AgentLibraryList Arguments::_libraryList;
111 AgentLibraryList Arguments::_agentList;
112
113 abort_hook_t Arguments::_abort_hook = NULL;
114 exit_hook_t Arguments::_exit_hook = NULL;
115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
116
117
118 SystemProperty *Arguments::_java_ext_dirs = NULL;
119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
121 SystemProperty *Arguments::_java_library_path = NULL;
122 SystemProperty *Arguments::_java_home = NULL;
123 SystemProperty *Arguments::_java_class_path = NULL;
124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
125
126 char* Arguments::_meta_index_path = NULL;
127 char* Arguments::_meta_index_dir = NULL;
128
129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
130
131 static bool match_option(const JavaVMOption *option, const char* name,
132 const char** tail) {
133 int len = (int)strlen(name);
134 if (strncmp(option->optionString, name, len) == 0) {
135 *tail = option->optionString + len;
136 return true;
137 } else {
138 return false;
139 }
140 }
141
142 static void logOption(const char* opt) {
143 if (PrintVMOptions) {
144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
145 }
146 }
147
148 // Process java launcher properties.
149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
151 // sun.java.launcher.pid is defined.
152 // Must do this before setting up other system properties,
153 // as some of them may depend on launcher type.
154 for (int index = 0; index < args->nOptions; index++) {
155 const JavaVMOption* option = args->options + index;
156 const char* tail;
157
158 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
159 process_java_launcher_argument(tail, option->extraInfo);
160 continue;
161 }
162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
163 if (strcmp(tail, "true") == 0) {
164 _sun_java_launcher_is_altjvm = true;
165 }
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
174
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
177
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
183
184 // Following are JVMTI agent writable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
193
194 _java_class_path = new SystemProperty("java.class.path", "", true);
195
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
204
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
208
209
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
216
217 spec_vendor = "Oracle Corporation";
218 spec_version = JDK_Version::current().major_version();
219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220
221 PropertyList_add(&_system_properties,
222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.version", buffer, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
227 }
228
229 /**
230 * Provide a slightly more user-friendly way of eliminating -XX flags.
231 * When a flag is eliminated, it can be added to this list in order to
232 * continue accepting this flag on the command-line, while issuing a warning
233 * and ignoring the value. Once the JDK version reaches the 'accept_until'
234 * limit, we flatly refuse to admit the existence of the flag. This allows
235 * a flag to die correctly over JDK releases using HSX.
236 */
237 typedef struct {
238 const char* name;
239 JDK_Version obsoleted_in; // when the flag went away
240 JDK_Version accept_until; // which version to start denying the existence
241 } ObsoleteFlag;
242
243 static ObsoleteFlag obsolete_jvm_flags[] = {
244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
259 { "DefaultInitialRAMFraction",
260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "UseDepthFirstScavengeOrder",
262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
263 { "HandlePromotionFailure",
264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
265 { "MaxLiveObjectEvacuationRatio",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
268 { "UseParallelOldGCCompacting",
269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
270 { "UseParallelDensePrefixUpdate",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelOldGCDensePrefix",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
296 #ifdef PRODUCT
297 { "DesiredMethodLimit",
298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
299 #endif // PRODUCT
300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 #ifndef ZERO
310 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 #endif // ZERO
313 { NULL, JDK_Version(0), JDK_Version(0) }
314 };
315
316 // Returns true if the flag is obsolete and fits into the range specified
317 // for being ignored. In the case that the flag is ignored, the 'version'
318 // value is filled in with the version number when the flag became
319 // obsolete so that that value can be displayed to the user.
320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
321 int i = 0;
322 assert(version != NULL, "Must provide a version buffer");
323 while (obsolete_jvm_flags[i].name != NULL) {
324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
325 // <flag>=xxx form
326 // [-|+]<flag> form
327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
328 ((s[0] == '+' || s[0] == '-') &&
329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
331 *version = flag_status.obsoleted_in;
332 return true;
333 }
334 }
335 i++;
336 }
337 return false;
338 }
339
340 // Constructs the system class path (aka boot class path) from the following
341 // components, in order:
342 //
343 // prefix // from -Xbootclasspath/p:...
344 // endorsed // the expansion of -Djava.endorsed.dirs=...
345 // base // from os::get_system_properties() or -Xbootclasspath=
346 // suffix // from -Xbootclasspath/a:...
347 //
348 // java.endorsed.dirs is a list of directories; any jar or zip files in the
349 // directories are added to the sysclasspath just before the base.
350 //
351 // This could be AllStatic, but it isn't needed after argument processing is
352 // complete.
353 class SysClassPath: public StackObj {
354 public:
355 SysClassPath(const char* base);
356 ~SysClassPath();
357
358 inline void set_base(const char* base);
359 inline void add_prefix(const char* prefix);
360 inline void add_suffix_to_prefix(const char* suffix);
361 inline void add_suffix(const char* suffix);
362 inline void reset_path(const char* base);
363
364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
365 // property. Must be called after all command-line arguments have been
366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
367 // combined_path().
368 void expand_endorsed();
369
370 inline const char* get_base() const { return _items[_scp_base]; }
371 inline const char* get_prefix() const { return _items[_scp_prefix]; }
372 inline const char* get_suffix() const { return _items[_scp_suffix]; }
373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
374
375 // Combine all the components into a single c-heap-allocated string; caller
376 // must free the string if/when no longer needed.
377 char* combined_path();
378
379 private:
380 // Utility routines.
381 static char* add_to_path(const char* path, const char* str, bool prepend);
382 static char* add_jars_to_path(char* path, const char* directory);
383
384 inline void reset_item_at(int index);
385
386 // Array indices for the items that make up the sysclasspath. All except the
387 // base are allocated in the C heap and freed by this class.
388 enum {
389 _scp_prefix, // from -Xbootclasspath/p:...
390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
391 _scp_base, // the default sysclasspath
392 _scp_suffix, // from -Xbootclasspath/a:...
393 _scp_nitems // the number of items, must be last.
394 };
395
396 const char* _items[_scp_nitems];
397 DEBUG_ONLY(bool _expansion_done;)
398 };
399
400 SysClassPath::SysClassPath(const char* base) {
401 memset(_items, 0, sizeof(_items));
402 _items[_scp_base] = base;
403 DEBUG_ONLY(_expansion_done = false;)
404 }
405
406 SysClassPath::~SysClassPath() {
407 // Free everything except the base.
408 for (int i = 0; i < _scp_nitems; ++i) {
409 if (i != _scp_base) reset_item_at(i);
410 }
411 DEBUG_ONLY(_expansion_done = false;)
412 }
413
414 inline void SysClassPath::set_base(const char* base) {
415 _items[_scp_base] = base;
416 }
417
418 inline void SysClassPath::add_prefix(const char* prefix) {
419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
420 }
421
422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
424 }
425
426 inline void SysClassPath::add_suffix(const char* suffix) {
427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
428 }
429
430 inline void SysClassPath::reset_item_at(int index) {
431 assert(index < _scp_nitems && index != _scp_base, "just checking");
432 if (_items[index] != NULL) {
433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
434 _items[index] = NULL;
435 }
436 }
437
438 inline void SysClassPath::reset_path(const char* base) {
439 // Clear the prefix and suffix.
440 reset_item_at(_scp_prefix);
441 reset_item_at(_scp_suffix);
442 set_base(base);
443 }
444
445 //------------------------------------------------------------------------------
446
447 void SysClassPath::expand_endorsed() {
448 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
449
450 const char* path = Arguments::get_property("java.endorsed.dirs");
451 if (path == NULL) {
452 path = Arguments::get_endorsed_dir();
453 assert(path != NULL, "no default for java.endorsed.dirs");
454 }
455
456 char* expanded_path = NULL;
457 const char separator = *os::path_separator();
458 const char* const end = path + strlen(path);
459 while (path < end) {
460 const char* tmp_end = strchr(path, separator);
461 if (tmp_end == NULL) {
462 expanded_path = add_jars_to_path(expanded_path, path);
463 path = end;
464 } else {
465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
466 memcpy(dirpath, path, tmp_end - path);
467 dirpath[tmp_end - path] = '\0';
468 expanded_path = add_jars_to_path(expanded_path, dirpath);
469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
470 path = tmp_end + 1;
471 }
472 }
473 _items[_scp_endorsed] = expanded_path;
474 DEBUG_ONLY(_expansion_done = true;)
475 }
476
477 // Combine the bootclasspath elements, some of which may be null, into a single
478 // c-heap-allocated string.
479 char* SysClassPath::combined_path() {
480 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
481 assert(_expansion_done, "must call expand_endorsed() first.");
482
483 size_t lengths[_scp_nitems];
484 size_t total_len = 0;
485
486 const char separator = *os::path_separator();
487
488 // Get the lengths.
489 int i;
490 for (i = 0; i < _scp_nitems; ++i) {
491 if (_items[i] != NULL) {
492 lengths[i] = strlen(_items[i]);
493 // Include space for the separator char (or a NULL for the last item).
494 total_len += lengths[i] + 1;
495 }
496 }
497 assert(total_len > 0, "empty sysclasspath not allowed");
498
499 // Copy the _items to a single string.
500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
501 char* cp_tmp = cp;
502 for (i = 0; i < _scp_nitems; ++i) {
503 if (_items[i] != NULL) {
504 memcpy(cp_tmp, _items[i], lengths[i]);
505 cp_tmp += lengths[i];
506 *cp_tmp++ = separator;
507 }
508 }
509 *--cp_tmp = '\0'; // Replace the extra separator.
510 return cp;
511 }
512
513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
514 char*
515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
516 char *cp;
517
518 assert(str != NULL, "just checking");
519 if (path == NULL) {
520 size_t len = strlen(str) + 1;
521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
522 memcpy(cp, str, len); // copy the trailing null
523 } else {
524 const char separator = *os::path_separator();
525 size_t old_len = strlen(path);
526 size_t str_len = strlen(str);
527 size_t len = old_len + str_len + 2;
528
529 if (prepend) {
530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
531 char* cp_tmp = cp;
532 memcpy(cp_tmp, str, str_len);
533 cp_tmp += str_len;
534 *cp_tmp = separator;
535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
536 FREE_C_HEAP_ARRAY(char, path, mtInternal);
537 } else {
538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
539 char* cp_tmp = cp + old_len;
540 *cp_tmp = separator;
541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
542 }
543 }
544 return cp;
545 }
546
547 // Scan the directory and append any jar or zip files found to path.
548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
550 DIR* dir = os::opendir(directory);
551 if (dir == NULL) return path;
552
553 char dir_sep[2] = { '\0', '\0' };
554 size_t directory_len = strlen(directory);
555 const char fileSep = *os::file_separator();
556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
557
558 /* Scan the directory for jars/zips, appending them to path. */
559 struct dirent *entry;
560 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
561 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
562 const char* name = entry->d_name;
563 const char* ext = name + strlen(name) - 4;
564 bool isJarOrZip = ext > name &&
565 (os::file_name_strcmp(ext, ".jar") == 0 ||
566 os::file_name_strcmp(ext, ".zip") == 0);
567 if (isJarOrZip) {
568 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
569 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
570 path = add_to_path(path, jarpath, false);
571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
572 }
573 }
574 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
575 os::closedir(dir);
576 return path;
577 }
578
579 // Parses a memory size specification string.
580 static bool atomull(const char *s, julong* result) {
581 julong n = 0;
582 int args_read = 0;
583 bool is_hex = false;
584 // Skip leading 0[xX] for hexadecimal
585 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
586 s += 2;
587 is_hex = true;
588 args_read = sscanf(s, JULONG_FORMAT_X, &n);
589 } else {
590 args_read = sscanf(s, JULONG_FORMAT, &n);
591 }
592 if (args_read != 1) {
593 return false;
594 }
595 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
596 s++;
597 }
598 // 4705540: illegal if more characters are found after the first non-digit
599 if (strlen(s) > 1) {
600 return false;
601 }
602 switch (*s) {
603 case 'T': case 't':
604 *result = n * G * K;
605 // Check for overflow.
606 if (*result/((julong)G * K) != n) return false;
607 return true;
608 case 'G': case 'g':
609 *result = n * G;
610 if (*result/G != n) return false;
611 return true;
612 case 'M': case 'm':
613 *result = n * M;
614 if (*result/M != n) return false;
615 return true;
616 case 'K': case 'k':
617 *result = n * K;
618 if (*result/K != n) return false;
619 return true;
620 case '\0':
621 *result = n;
622 return true;
623 default:
624 return false;
625 }
626 }
627
628 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
629 if (size < min_size) return arg_too_small;
630 // Check that size will fit in a size_t (only relevant on 32-bit)
631 if (size > max_uintx) return arg_too_big;
632 return arg_in_range;
633 }
634
635 // Describe an argument out of range error
636 void Arguments::describe_range_error(ArgsRange errcode) {
637 switch(errcode) {
638 case arg_too_big:
639 jio_fprintf(defaultStream::error_stream(),
640 "The specified size exceeds the maximum "
641 "representable size.\n");
642 break;
643 case arg_too_small:
644 case arg_unreadable:
645 case arg_in_range:
646 // do nothing for now
647 break;
648 default:
649 ShouldNotReachHere();
650 }
651 }
652
653 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
654 return CommandLineFlags::boolAtPut(name, &value, origin);
655 }
656
657 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
658 double v;
659 if (sscanf(value, "%lf", &v) != 1) {
660 return false;
661 }
662
663 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
664 return true;
665 }
666 return false;
667 }
668
669 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
670 julong v;
671 intx intx_v;
672 bool is_neg = false;
673 // Check the sign first since atomull() parses only unsigned values.
674 if (*value == '-') {
675 if (!CommandLineFlags::intxAt(name, &intx_v)) {
676 return false;
677 }
678 value++;
679 is_neg = true;
680 }
681 if (!atomull(value, &v)) {
682 return false;
683 }
684 intx_v = (intx) v;
685 if (is_neg) {
686 intx_v = -intx_v;
687 }
688 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
689 return true;
690 }
691 uintx uintx_v = (uintx) v;
692 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
693 return true;
694 }
695 uint64_t uint64_t_v = (uint64_t) v;
696 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
697 return true;
698 }
699 size_t size_t_v = (size_t) v;
700 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
701 return true;
702 }
703 return false;
704 }
705
706 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
707 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
708 // Contract: CommandLineFlags always returns a pointer that needs freeing.
709 FREE_C_HEAP_ARRAY(char, value, mtInternal);
710 return true;
711 }
712
713 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
714 const char* old_value = "";
715 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
716 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
717 size_t new_len = strlen(new_value);
718 const char* value;
719 char* free_this_too = NULL;
720 if (old_len == 0) {
721 value = new_value;
722 } else if (new_len == 0) {
723 value = old_value;
724 } else {
725 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
726 // each new setting adds another LINE to the switch:
727 sprintf(buf, "%s\n%s", old_value, new_value);
728 value = buf;
729 free_this_too = buf;
730 }
731 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
732 // CommandLineFlags always returns a pointer that needs freeing.
733 FREE_C_HEAP_ARRAY(char, value, mtInternal);
734 if (free_this_too != NULL) {
735 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
736 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
737 }
738 return true;
739 }
740
741 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
742
743 // range of acceptable characters spelled out for portability reasons
744 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
745 #define BUFLEN 255
746 char name[BUFLEN+1];
747 char dummy;
748
749 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
750 return set_bool_flag(name, false, origin);
751 }
752 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
753 return set_bool_flag(name, true, origin);
754 }
755
756 char punct;
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
758 const char* value = strchr(arg, '=') + 1;
759 Flag* flag = Flag::find_flag(name, strlen(name));
760 if (flag != NULL && flag->is_ccstr()) {
761 if (flag->ccstr_accumulates()) {
762 return append_to_string_flag(name, value, origin);
763 } else {
764 if (value[0] == '\0') {
765 value = NULL;
766 }
767 return set_string_flag(name, value, origin);
768 }
769 }
770 }
771
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
773 const char* value = strchr(arg, '=') + 1;
774 // -XX:Foo:=xxx will reset the string flag to the given value.
775 if (value[0] == '\0') {
776 value = NULL;
777 }
778 return set_string_flag(name, value, origin);
779 }
780
781 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
782 #define SIGNED_NUMBER_RANGE "[-0123456789]"
783 #define NUMBER_RANGE "[0123456789]"
784 char value[BUFLEN + 1];
785 char value2[BUFLEN + 1];
786 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
787 // Looks like a floating-point number -- try again with more lenient format string
788 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
789 return set_fp_numeric_flag(name, value, origin);
790 }
791 }
792
793 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
794 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
795 return set_numeric_flag(name, value, origin);
796 }
797
798 return false;
799 }
800
801 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
802 assert(bldarray != NULL, "illegal argument");
803
804 if (arg == NULL) {
805 return;
806 }
807
808 int new_count = *count + 1;
809
810 // expand the array and add arg to the last element
811 if (*bldarray == NULL) {
812 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
813 } else {
814 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
815 }
816 (*bldarray)[*count] = os::strdup_check_oom(arg);
817 *count = new_count;
818 }
819
820 void Arguments::build_jvm_args(const char* arg) {
821 add_string(&_jvm_args_array, &_num_jvm_args, arg);
822 }
823
824 void Arguments::build_jvm_flags(const char* arg) {
825 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
826 }
827
828 // utility function to return a string that concatenates all
829 // strings in a given char** array
830 const char* Arguments::build_resource_string(char** args, int count) {
831 if (args == NULL || count == 0) {
832 return NULL;
833 }
834 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
835 for (int i = 1; i < count; i++) {
836 length += strlen(args[i]) + 1; // add 1 for a space
837 }
838 char* s = NEW_RESOURCE_ARRAY(char, length);
839 strcpy(s, args[0]);
840 for (int j = 1; j < count; j++) {
841 strcat(s, " ");
842 strcat(s, args[j]);
843 }
844 return (const char*) s;
845 }
846
847 void Arguments::print_on(outputStream* st) {
848 st->print_cr("VM Arguments:");
849 if (num_jvm_flags() > 0) {
850 st->print("jvm_flags: "); print_jvm_flags_on(st);
851 }
852 if (num_jvm_args() > 0) {
853 st->print("jvm_args: "); print_jvm_args_on(st);
854 }
855 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
856 if (_java_class_path != NULL) {
857 char* path = _java_class_path->value();
858 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
859 }
860 st->print_cr("Launcher Type: %s", _sun_java_launcher);
861 }
862
863 void Arguments::print_jvm_flags_on(outputStream* st) {
864 if (_num_jvm_flags > 0) {
865 for (int i=0; i < _num_jvm_flags; i++) {
866 st->print("%s ", _jvm_flags_array[i]);
867 }
868 st->cr();
869 }
870 }
871
872 void Arguments::print_jvm_args_on(outputStream* st) {
873 if (_num_jvm_args > 0) {
874 for (int i=0; i < _num_jvm_args; i++) {
875 st->print("%s ", _jvm_args_array[i]);
876 }
877 st->cr();
878 }
879 }
880
881 bool Arguments::process_argument(const char* arg,
882 jboolean ignore_unrecognized, Flag::Flags origin) {
883
884 JDK_Version since = JDK_Version();
885
886 if (parse_argument(arg, origin) || ignore_unrecognized) {
887 return true;
888 }
889
890 bool has_plus_minus = (*arg == '+' || *arg == '-');
891 const char* const argname = has_plus_minus ? arg + 1 : arg;
892 if (is_newly_obsolete(arg, &since)) {
893 char version[256];
894 since.to_string(version, sizeof(version));
895 warning("ignoring option %s; support was removed in %s", argname, version);
896 return true;
897 }
898
899 // For locked flags, report a custom error message if available.
900 // Otherwise, report the standard unrecognized VM option.
901
902 size_t arg_len;
903 const char* equal_sign = strchr(argname, '=');
904 if (equal_sign == NULL) {
905 arg_len = strlen(argname);
906 } else {
907 arg_len = equal_sign - argname;
908 }
909
910 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
911 if (found_flag != NULL) {
912 char locked_message_buf[BUFLEN];
913 found_flag->get_locked_message(locked_message_buf, BUFLEN);
914 if (strlen(locked_message_buf) == 0) {
915 if (found_flag->is_bool() && !has_plus_minus) {
916 jio_fprintf(defaultStream::error_stream(),
917 "Missing +/- setting for VM option '%s'\n", argname);
918 } else if (!found_flag->is_bool() && has_plus_minus) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Unexpected +/- setting in VM option '%s'\n", argname);
921 } else {
922 jio_fprintf(defaultStream::error_stream(),
923 "Improperly specified VM option '%s'\n", argname);
924 }
925 } else {
926 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
927 }
928 } else {
929 jio_fprintf(defaultStream::error_stream(),
930 "Unrecognized VM option '%s'\n", argname);
931 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
932 if (fuzzy_matched != NULL) {
933 jio_fprintf(defaultStream::error_stream(),
934 "Did you mean '%s%s%s'?\n",
935 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
936 fuzzy_matched->_name,
937 (fuzzy_matched->is_bool()) ? "" : "=<value>");
938 }
939 }
940
941 // allow for commandline "commenting out" options like -XX:#+Verbose
942 return arg[0] == '#';
943 }
944
945 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
946 FILE* stream = fopen(file_name, "rb");
947 if (stream == NULL) {
948 if (should_exist) {
949 jio_fprintf(defaultStream::error_stream(),
950 "Could not open settings file %s\n", file_name);
951 return false;
952 } else {
953 return true;
954 }
955 }
956
957 char token[1024];
958 int pos = 0;
959
960 bool in_white_space = true;
961 bool in_comment = false;
962 bool in_quote = false;
963 char quote_c = 0;
964 bool result = true;
965
966 int c = getc(stream);
967 while(c != EOF && pos < (int)(sizeof(token)-1)) {
968 if (in_white_space) {
969 if (in_comment) {
970 if (c == '\n') in_comment = false;
971 } else {
972 if (c == '#') in_comment = true;
973 else if (!isspace(c)) {
974 in_white_space = false;
975 token[pos++] = c;
976 }
977 }
978 } else {
979 if (c == '\n' || (!in_quote && isspace(c))) {
980 // token ends at newline, or at unquoted whitespace
981 // this allows a way to include spaces in string-valued options
982 token[pos] = '\0';
983 logOption(token);
984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
985 build_jvm_flags(token);
986 pos = 0;
987 in_white_space = true;
988 in_quote = false;
989 } else if (!in_quote && (c == '\'' || c == '"')) {
990 in_quote = true;
991 quote_c = c;
992 } else if (in_quote && (c == quote_c)) {
993 in_quote = false;
994 } else {
995 token[pos++] = c;
996 }
997 }
998 c = getc(stream);
999 }
1000 if (pos > 0) {
1001 token[pos] = '\0';
1002 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1003 build_jvm_flags(token);
1004 }
1005 fclose(stream);
1006 return result;
1007 }
1008
1009 //=============================================================================================================
1010 // Parsing of properties (-D)
1011
1012 const char* Arguments::get_property(const char* key) {
1013 return PropertyList_get_value(system_properties(), key);
1014 }
1015
1016 bool Arguments::add_property(const char* prop) {
1017 const char* eq = strchr(prop, '=');
1018 char* key;
1019 // ns must be static--its address may be stored in a SystemProperty object.
1020 const static char ns[1] = {0};
1021 char* value = (char *)ns;
1022
1023 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1024 key = AllocateHeap(key_len + 1, mtInternal);
1025 strncpy(key, prop, key_len);
1026 key[key_len] = '\0';
1027
1028 if (eq != NULL) {
1029 size_t value_len = strlen(prop) - key_len - 1;
1030 value = AllocateHeap(value_len + 1, mtInternal);
1031 strncpy(value, &prop[key_len + 1], value_len + 1);
1032 }
1033
1034 if (strcmp(key, "java.compiler") == 0) {
1035 process_java_compiler_argument(value);
1036 FreeHeap(key);
1037 if (eq != NULL) {
1038 FreeHeap(value);
1039 }
1040 return true;
1041 } else if (strcmp(key, "sun.java.command") == 0) {
1042 _java_command = value;
1043
1044 // Record value in Arguments, but let it get passed to Java.
1045 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1046 strcmp(key, "sun.java.launcher.pid") == 0) {
1047 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1048 // private and are processed in process_sun_java_launcher_properties();
1049 // the sun.java.launcher property is passed on to the java application
1050 FreeHeap(key);
1051 if (eq != NULL) {
1052 FreeHeap(value);
1053 }
1054 return true;
1055 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1056 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1057 // its value without going through the property list or making a Java call.
1058 _java_vendor_url_bug = value;
1059 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1060 PropertyList_unique_add(&_system_properties, key, value, true);
1061 return true;
1062 }
1063 // Create new property and add at the end of the list
1064 PropertyList_unique_add(&_system_properties, key, value);
1065 return true;
1066 }
1067
1068 //===========================================================================================================
1069 // Setting int/mixed/comp mode flags
1070
1071 void Arguments::set_mode_flags(Mode mode) {
1072 // Set up default values for all flags.
1073 // If you add a flag to any of the branches below,
1074 // add a default value for it here.
1075 set_java_compiler(false);
1076 _mode = mode;
1077
1078 // Ensure Agent_OnLoad has the correct initial values.
1079 // This may not be the final mode; mode may change later in onload phase.
1080 PropertyList_unique_add(&_system_properties, "java.vm.info",
1081 (char*)VM_Version::vm_info_string(), false);
1082
1083 UseInterpreter = true;
1084 UseCompiler = true;
1085 UseLoopCounter = true;
1086
1087 // Default values may be platform/compiler dependent -
1088 // use the saved values
1089 ClipInlining = Arguments::_ClipInlining;
1090 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1091 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1092 BackgroundCompilation = Arguments::_BackgroundCompilation;
1093
1094 // Change from defaults based on mode
1095 switch (mode) {
1096 default:
1097 ShouldNotReachHere();
1098 break;
1099 case _int:
1100 UseCompiler = false;
1101 UseLoopCounter = false;
1102 AlwaysCompileLoopMethods = false;
1103 UseOnStackReplacement = false;
1104 break;
1105 case _mixed:
1106 // same as default
1107 break;
1108 case _comp:
1109 UseInterpreter = false;
1110 BackgroundCompilation = false;
1111 ClipInlining = false;
1112 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1113 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1114 // compile a level 4 (C2) and then continue executing it.
1115 if (TieredCompilation) {
1116 Tier3InvokeNotifyFreqLog = 0;
1117 Tier4InvocationThreshold = 0;
1118 }
1119 break;
1120 }
1121 }
1122
1123 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1124 // Conflict: required to use shared spaces (-Xshare:on), but
1125 // incompatible command line options were chosen.
1126
1127 static void no_shared_spaces(const char* message) {
1128 if (RequireSharedSpaces) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "Class data sharing is inconsistent with other specified options.\n");
1131 vm_exit_during_initialization("Unable to use shared archive.", message);
1132 } else {
1133 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1134 }
1135 }
1136 #endif
1137
1138 void Arguments::set_tiered_flags() {
1139 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1140 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1141 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1142 }
1143 if (CompilationPolicyChoice < 2) {
1144 vm_exit_during_initialization(
1145 "Incompatible compilation policy selected", NULL);
1146 }
1147 // Increase the code cache size - tiered compiles a lot more.
1148 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1149 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1150 }
1151 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1152 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1153 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1154
1155 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1156 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1157 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1158 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1159 }
1160 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1161 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1162 }
1163 // Check consistency of code heap sizes
1164 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1167 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1168 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1169 vm_exit(1);
1170 }
1171 }
1172 }
1173 if (!UseInterpreter) { // -Xcomp
1174 Tier3InvokeNotifyFreqLog = 0;
1175 Tier4InvocationThreshold = 0;
1176 }
1177 }
1178
1179 /**
1180 * Returns the minimum number of compiler threads needed to run the JVM. The following
1181 * configurations are possible.
1182 *
1183 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1184 * compiler threads is 0.
1185 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1186 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1187 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1188 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1189 * C1 can be used, so the minimum number of compiler threads is 1.
1190 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1191 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1192 * the minimum number of compiler threads is 2.
1193 */
1194 int Arguments::get_min_number_of_compiler_threads() {
1195 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1196 return 0; // case 1
1197 #else
1198 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1199 return 1; // case 2 or case 3
1200 }
1201 return 2; // case 4 (tiered)
1202 #endif
1203 }
1204
1205 #if INCLUDE_ALL_GCS
1206 static void disable_adaptive_size_policy(const char* collector_name) {
1207 if (UseAdaptiveSizePolicy) {
1208 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1209 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1210 collector_name);
1211 }
1212 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1213 }
1214 }
1215
1216 void Arguments::set_parnew_gc_flags() {
1217 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1218 "control point invariant");
1219 assert(UseParNewGC, "Error");
1220
1221 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1222 disable_adaptive_size_policy("UseParNewGC");
1223
1224 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1225 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1226 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1227 } else if (ParallelGCThreads == 0) {
1228 jio_fprintf(defaultStream::error_stream(),
1229 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1230 vm_exit(1);
1231 }
1232
1233 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1234 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1235 // we set them to 1024 and 1024.
1236 // See CR 6362902.
1237 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1238 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1239 }
1240 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1241 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1242 }
1243
1244 // When using compressed oops, we use local overflow stacks,
1245 // rather than using a global overflow list chained through
1246 // the klass word of the object's pre-image.
1247 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1248 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1249 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1250 }
1251 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1252 }
1253 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1254 }
1255
1256 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1257 // sparc/solaris for certain applications, but would gain from
1258 // further optimization and tuning efforts, and would almost
1259 // certainly gain from analysis of platform and environment.
1260 void Arguments::set_cms_and_parnew_gc_flags() {
1261 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1262 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1263
1264 // If we are using CMS, we prefer to UseParNewGC,
1265 // unless explicitly forbidden.
1266 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1267 FLAG_SET_ERGO(bool, UseParNewGC, true);
1268 }
1269
1270 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1271 disable_adaptive_size_policy("UseConcMarkSweepGC");
1272
1273 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1274 // as needed.
1275 if (UseParNewGC) {
1276 set_parnew_gc_flags();
1277 }
1278
1279 size_t max_heap = align_size_down(MaxHeapSize,
1280 CardTableRS::ct_max_alignment_constraint());
1281
1282 // Now make adjustments for CMS
1283 intx tenuring_default = (intx)6;
1284 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1285
1286 // Preferred young gen size for "short" pauses:
1287 // upper bound depends on # of threads and NewRatio.
1288 const uintx parallel_gc_threads =
1289 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1290 const size_t preferred_max_new_size_unaligned =
1291 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1292 size_t preferred_max_new_size =
1293 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1294
1295 // Unless explicitly requested otherwise, size young gen
1296 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1297
1298 // If either MaxNewSize or NewRatio is set on the command line,
1299 // assume the user is trying to set the size of the young gen.
1300 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1301
1302 // Set MaxNewSize to our calculated preferred_max_new_size unless
1303 // NewSize was set on the command line and it is larger than
1304 // preferred_max_new_size.
1305 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1306 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1307 } else {
1308 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1309 }
1310 if (PrintGCDetails && Verbose) {
1311 // Too early to use gclog_or_tty
1312 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1313 }
1314
1315 // Code along this path potentially sets NewSize and OldSize
1316 if (PrintGCDetails && Verbose) {
1317 // Too early to use gclog_or_tty
1318 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1319 " initial_heap_size: " SIZE_FORMAT
1320 " max_heap: " SIZE_FORMAT,
1321 min_heap_size(), InitialHeapSize, max_heap);
1322 }
1323 size_t min_new = preferred_max_new_size;
1324 if (FLAG_IS_CMDLINE(NewSize)) {
1325 min_new = NewSize;
1326 }
1327 if (max_heap > min_new && min_heap_size() > min_new) {
1328 // Unless explicitly requested otherwise, make young gen
1329 // at least min_new, and at most preferred_max_new_size.
1330 if (FLAG_IS_DEFAULT(NewSize)) {
1331 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1332 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1333 if (PrintGCDetails && Verbose) {
1334 // Too early to use gclog_or_tty
1335 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1336 }
1337 }
1338 // Unless explicitly requested otherwise, size old gen
1339 // so it's NewRatio x of NewSize.
1340 if (FLAG_IS_DEFAULT(OldSize)) {
1341 if (max_heap > NewSize) {
1342 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1343 if (PrintGCDetails && Verbose) {
1344 // Too early to use gclog_or_tty
1345 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1346 }
1347 }
1348 }
1349 }
1350 }
1351 // Unless explicitly requested otherwise, definitely
1352 // promote all objects surviving "tenuring_default" scavenges.
1353 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1354 FLAG_IS_DEFAULT(SurvivorRatio)) {
1355 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1356 }
1357 // If we decided above (or user explicitly requested)
1358 // `promote all' (via MaxTenuringThreshold := 0),
1359 // prefer minuscule survivor spaces so as not to waste
1360 // space for (non-existent) survivors
1361 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1362 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1363 }
1364 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1365 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1366 // This is done in order to make ParNew+CMS configuration to work
1367 // with YoungPLABSize and OldPLABSize options.
1368 // See CR 6362902.
1369 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1370 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1371 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1372 // is. In this situation let CMSParPromoteBlocksToClaim follow
1373 // the value (either from the command line or ergonomics) of
1374 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1375 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1376 } else {
1377 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1378 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1379 // we'll let it to take precedence.
1380 jio_fprintf(defaultStream::error_stream(),
1381 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1382 " options are specified for the CMS collector."
1383 " CMSParPromoteBlocksToClaim will take precedence.\n");
1384 }
1385 }
1386 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1387 // OldPLAB sizing manually turned off: Use a larger default setting,
1388 // unless it was manually specified. This is because a too-low value
1389 // will slow down scavenges.
1390 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1391 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1392 }
1393 }
1394 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1395 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1396 // If either of the static initialization defaults have changed, note this
1397 // modification.
1398 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1399 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1400 }
1401 if (PrintGCDetails && Verbose) {
1402 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1403 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1404 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1405 }
1406 }
1407 #endif // INCLUDE_ALL_GCS
1408
1409 void set_object_alignment() {
1410 // Object alignment.
1411 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1412 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1413 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1414 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1415 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1416 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1417
1418 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1419 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1420
1421 // Oop encoding heap max
1422 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1423
1424 #if INCLUDE_ALL_GCS
1425 // Set CMS global values
1426 CompactibleFreeListSpace::set_cms_values();
1427 #endif // INCLUDE_ALL_GCS
1428 }
1429
1430 bool verify_object_alignment() {
1431 // Object alignment.
1432 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1433 jio_fprintf(defaultStream::error_stream(),
1434 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1435 (int)ObjectAlignmentInBytes);
1436 return false;
1437 }
1438 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1439 jio_fprintf(defaultStream::error_stream(),
1440 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1441 (int)ObjectAlignmentInBytes, BytesPerLong);
1442 return false;
1443 }
1444 // It does not make sense to have big object alignment
1445 // since a space lost due to alignment will be greater
1446 // then a saved space from compressed oops.
1447 if ((int)ObjectAlignmentInBytes > 256) {
1448 jio_fprintf(defaultStream::error_stream(),
1449 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1450 (int)ObjectAlignmentInBytes);
1451 return false;
1452 }
1453 // In case page size is very small.
1454 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1455 jio_fprintf(defaultStream::error_stream(),
1456 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1457 (int)ObjectAlignmentInBytes, os::vm_page_size());
1458 return false;
1459 }
1460 if(SurvivorAlignmentInBytes == 0) {
1461 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1462 } else {
1463 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1464 jio_fprintf(defaultStream::error_stream(),
1465 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1466 (int)SurvivorAlignmentInBytes);
1467 return false;
1468 }
1469 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1470 jio_fprintf(defaultStream::error_stream(),
1471 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1472 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1473 return false;
1474 }
1475 }
1476 return true;
1477 }
1478
1479 size_t Arguments::max_heap_for_compressed_oops() {
1480 // Avoid sign flip.
1481 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1482 // We need to fit both the NULL page and the heap into the memory budget, while
1483 // keeping alignment constraints of the heap. To guarantee the latter, as the
1484 // NULL page is located before the heap, we pad the NULL page to the conservative
1485 // maximum alignment that the GC may ever impose upon the heap.
1486 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1487 _conservative_max_heap_alignment);
1488
1489 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1490 NOT_LP64(ShouldNotReachHere(); return 0);
1491 }
1492
1493 bool Arguments::should_auto_select_low_pause_collector() {
1494 if (UseAutoGCSelectPolicy &&
1495 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1496 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1497 if (PrintGCDetails) {
1498 // Cannot use gclog_or_tty yet.
1499 tty->print_cr("Automatic selection of the low pause collector"
1500 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1501 }
1502 return true;
1503 }
1504 return false;
1505 }
1506
1507 void Arguments::set_use_compressed_oops() {
1508 #ifndef ZERO
1509 #ifdef _LP64
1510 // MaxHeapSize is not set up properly at this point, but
1511 // the only value that can override MaxHeapSize if we are
1512 // to use UseCompressedOops is InitialHeapSize.
1513 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1514
1515 if (max_heap_size <= max_heap_for_compressed_oops()) {
1516 #if !defined(COMPILER1) || defined(TIERED)
1517 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1518 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1519 }
1520 #endif
1521 #ifdef _WIN64
1522 if (UseLargePages && UseCompressedOops) {
1523 // Cannot allocate guard pages for implicit checks in indexed addressing
1524 // mode, when large pages are specified on windows.
1525 // This flag could be switched ON if narrow oop base address is set to 0,
1526 // see code in Universe::initialize_heap().
1527 Universe::set_narrow_oop_use_implicit_null_checks(false);
1528 }
1529 #endif // _WIN64
1530 } else {
1531 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1532 warning("Max heap size too large for Compressed Oops");
1533 FLAG_SET_DEFAULT(UseCompressedOops, false);
1534 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1535 }
1536 }
1537 #endif // _LP64
1538 #endif // ZERO
1539 }
1540
1541
1542 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1543 // set_use_compressed_oops().
1544 void Arguments::set_use_compressed_klass_ptrs() {
1545 #ifndef ZERO
1546 #ifdef _LP64
1547 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1548 if (!UseCompressedOops) {
1549 if (UseCompressedClassPointers) {
1550 warning("UseCompressedClassPointers requires UseCompressedOops");
1551 }
1552 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1553 } else {
1554 // Turn on UseCompressedClassPointers too
1555 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1556 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1557 }
1558 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1559 if (UseCompressedClassPointers) {
1560 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1561 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1562 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1563 }
1564 }
1565 }
1566 #endif // _LP64
1567 #endif // !ZERO
1568 }
1569
1570 void Arguments::set_conservative_max_heap_alignment() {
1571 // The conservative maximum required alignment for the heap is the maximum of
1572 // the alignments imposed by several sources: any requirements from the heap
1573 // itself, the collector policy and the maximum page size we may run the VM
1574 // with.
1575 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1576 #if INCLUDE_ALL_GCS
1577 if (UseParallelGC) {
1578 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1579 } else if (UseG1GC) {
1580 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1581 }
1582 #endif // INCLUDE_ALL_GCS
1583 _conservative_max_heap_alignment = MAX4(heap_alignment,
1584 (size_t)os::vm_allocation_granularity(),
1585 os::max_page_size(),
1586 CollectorPolicy::compute_heap_alignment());
1587 }
1588
1589 void Arguments::select_gc_ergonomically() {
1590 if (os::is_server_class_machine()) {
1591 if (should_auto_select_low_pause_collector()) {
1592 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1593 } else {
1594 FLAG_SET_ERGO(bool, UseParallelGC, true);
1595 }
1596 }
1597 }
1598
1599 void Arguments::select_gc() {
1600 if (!gc_selected()) {
1601 ArgumentsExt::select_gc_ergonomically();
1602 }
1603 }
1604
1605 void Arguments::set_ergonomics_flags() {
1606 select_gc();
1607
1608 #ifdef COMPILER2
1609 // Shared spaces work fine with other GCs but causes bytecode rewriting
1610 // to be disabled, which hurts interpreter performance and decreases
1611 // server performance. When -server is specified, keep the default off
1612 // unless it is asked for. Future work: either add bytecode rewriting
1613 // at link time, or rewrite bytecodes in non-shared methods.
1614 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1615 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1616 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1617 }
1618 #endif
1619
1620 set_conservative_max_heap_alignment();
1621
1622 #ifndef ZERO
1623 #ifdef _LP64
1624 set_use_compressed_oops();
1625
1626 // set_use_compressed_klass_ptrs() must be called after calling
1627 // set_use_compressed_oops().
1628 set_use_compressed_klass_ptrs();
1629
1630 // Also checks that certain machines are slower with compressed oops
1631 // in vm_version initialization code.
1632 #endif // _LP64
1633 #endif // !ZERO
1634 }
1635
1636 void Arguments::set_parallel_gc_flags() {
1637 assert(UseParallelGC || UseParallelOldGC, "Error");
1638 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1639 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1640 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1641 }
1642 FLAG_SET_DEFAULT(UseParallelGC, true);
1643
1644 // If no heap maximum was requested explicitly, use some reasonable fraction
1645 // of the physical memory, up to a maximum of 1GB.
1646 FLAG_SET_DEFAULT(ParallelGCThreads,
1647 Abstract_VM_Version::parallel_worker_threads());
1648 if (ParallelGCThreads == 0) {
1649 jio_fprintf(defaultStream::error_stream(),
1650 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1651 vm_exit(1);
1652 }
1653
1654 if (UseAdaptiveSizePolicy) {
1655 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1656 // unless the user actually sets these flags.
1657 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1658 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1659 _min_heap_free_ratio = MinHeapFreeRatio;
1660 }
1661 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1662 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1663 _max_heap_free_ratio = MaxHeapFreeRatio;
1664 }
1665 }
1666
1667 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1668 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1669 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1670 // See CR 6362902 for details.
1671 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1672 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1673 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1674 }
1675 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1676 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1677 }
1678 }
1679
1680 if (UseParallelOldGC) {
1681 // Par compact uses lower default values since they are treated as
1682 // minimums. These are different defaults because of the different
1683 // interpretation and are not ergonomically set.
1684 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1685 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1686 }
1687 }
1688 }
1689
1690 void Arguments::set_g1_gc_flags() {
1691 assert(UseG1GC, "Error");
1692 #ifdef COMPILER1
1693 FastTLABRefill = false;
1694 #endif
1695 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1696 if (ParallelGCThreads == 0) {
1697 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1698 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1699 }
1700
1701 #if INCLUDE_ALL_GCS
1702 if (G1ConcRefinementThreads == 0) {
1703 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1704 }
1705 #endif
1706
1707 // MarkStackSize will be set (if it hasn't been set by the user)
1708 // when concurrent marking is initialized.
1709 // Its value will be based upon the number of parallel marking threads.
1710 // But we do set the maximum mark stack size here.
1711 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1712 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1713 }
1714
1715 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1716 // In G1, we want the default GC overhead goal to be higher than
1717 // say in PS. So we set it here to 10%. Otherwise the heap might
1718 // be expanded more aggressively than we would like it to. In
1719 // fact, even 10% seems to not be high enough in some cases
1720 // (especially small GC stress tests that the main thing they do
1721 // is allocation). We might consider increase it further.
1722 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1723 }
1724
1725 if (PrintGCDetails && Verbose) {
1726 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1727 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1728 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1729 }
1730 }
1731
1732 #if !INCLUDE_ALL_GCS
1733 #ifdef ASSERT
1734 static bool verify_serial_gc_flags() {
1735 return (UseSerialGC &&
1736 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1737 UseParallelGC || UseParallelOldGC));
1738 }
1739 #endif // ASSERT
1740 #endif // INCLUDE_ALL_GCS
1741
1742 void Arguments::set_gc_specific_flags() {
1743 #if INCLUDE_ALL_GCS
1744 // Set per-collector flags
1745 if (UseParallelGC || UseParallelOldGC) {
1746 set_parallel_gc_flags();
1747 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1748 set_cms_and_parnew_gc_flags();
1749 } else if (UseParNewGC) { // Skipped if CMS is set above
1750 set_parnew_gc_flags();
1751 } else if (UseG1GC) {
1752 set_g1_gc_flags();
1753 }
1754 check_deprecated_gcs();
1755 check_deprecated_gc_flags();
1756 if (AssumeMP && !UseSerialGC) {
1757 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1758 warning("If the number of processors is expected to increase from one, then"
1759 " you should configure the number of parallel GC threads appropriately"
1760 " using -XX:ParallelGCThreads=N");
1761 }
1762 }
1763 if (MinHeapFreeRatio == 100) {
1764 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1765 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1766 }
1767 #else // INCLUDE_ALL_GCS
1768 assert(verify_serial_gc_flags(), "SerialGC unset");
1769 #endif // INCLUDE_ALL_GCS
1770 }
1771
1772 julong Arguments::limit_by_allocatable_memory(julong limit) {
1773 julong max_allocatable;
1774 julong result = limit;
1775 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1776 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1777 }
1778 return result;
1779 }
1780
1781 // Use static initialization to get the default before parsing
1782 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1783
1784 void Arguments::set_heap_size() {
1785 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1786 // Deprecated flag
1787 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1788 }
1789
1790 const julong phys_mem =
1791 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1792 : (julong)MaxRAM;
1793
1794 // If the maximum heap size has not been set with -Xmx,
1795 // then set it as fraction of the size of physical memory,
1796 // respecting the maximum and minimum sizes of the heap.
1797 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1798 julong reasonable_max = phys_mem / MaxRAMFraction;
1799
1800 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1801 // Small physical memory, so use a minimum fraction of it for the heap
1802 reasonable_max = phys_mem / MinRAMFraction;
1803 } else {
1804 // Not-small physical memory, so require a heap at least
1805 // as large as MaxHeapSize
1806 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1807 }
1808 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1809 // Limit the heap size to ErgoHeapSizeLimit
1810 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1811 }
1812 if (UseCompressedOops) {
1813 // Limit the heap size to the maximum possible when using compressed oops
1814 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1815
1816 // HeapBaseMinAddress can be greater than default but not less than.
1817 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1818 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1819 // matches compressed oops printing flags
1820 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1821 jio_fprintf(defaultStream::error_stream(),
1822 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1823 " (" UINTX_FORMAT "G) which is greater than value given "
1824 UINTX_FORMAT "\n",
1825 DefaultHeapBaseMinAddress,
1826 DefaultHeapBaseMinAddress/G,
1827 HeapBaseMinAddress);
1828 }
1829 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1830 }
1831 }
1832
1833 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1834 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1835 // but it should be not less than default MaxHeapSize.
1836 max_coop_heap -= HeapBaseMinAddress;
1837 }
1838 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1839 }
1840 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1841
1842 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1843 // An initial heap size was specified on the command line,
1844 // so be sure that the maximum size is consistent. Done
1845 // after call to limit_by_allocatable_memory because that
1846 // method might reduce the allocation size.
1847 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1848 }
1849
1850 if (PrintGCDetails && Verbose) {
1851 // Cannot use gclog_or_tty yet.
1852 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1853 }
1854 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1855 }
1856
1857 // If the minimum or initial heap_size have not been set or requested to be set
1858 // ergonomically, set them accordingly.
1859 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1860 julong reasonable_minimum = (julong)(OldSize + NewSize);
1861
1862 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1863
1864 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1865
1866 if (InitialHeapSize == 0) {
1867 julong reasonable_initial = phys_mem / InitialRAMFraction;
1868
1869 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1870 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1871
1872 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1873
1874 if (PrintGCDetails && Verbose) {
1875 // Cannot use gclog_or_tty yet.
1876 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1877 }
1878 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1879 }
1880 // If the minimum heap size has not been set (via -Xms),
1881 // synchronize with InitialHeapSize to avoid errors with the default value.
1882 if (min_heap_size() == 0) {
1883 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1884 if (PrintGCDetails && Verbose) {
1885 // Cannot use gclog_or_tty yet.
1886 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1887 }
1888 }
1889 }
1890 }
1891
1892 // This must be called after ergonomics because we want bytecode rewriting
1893 // if the server compiler is used, or if UseSharedSpaces is disabled.
1894 void Arguments::set_bytecode_flags() {
1895 // Better not attempt to store into a read-only space.
1896 if (UseSharedSpaces) {
1897 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1898 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1899 }
1900
1901 if (!RewriteBytecodes) {
1902 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1903 }
1904 }
1905
1906 // Aggressive optimization flags -XX:+AggressiveOpts
1907 void Arguments::set_aggressive_opts_flags() {
1908 #ifdef COMPILER2
1909 if (AggressiveUnboxing) {
1910 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1911 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1912 } else if (!EliminateAutoBox) {
1913 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1914 AggressiveUnboxing = false;
1915 }
1916 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1917 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1918 } else if (!DoEscapeAnalysis) {
1919 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1920 AggressiveUnboxing = false;
1921 }
1922 }
1923 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1924 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1925 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1926 }
1927 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1928 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1929 }
1930
1931 // Feed the cache size setting into the JDK
1932 char buffer[1024];
1933 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1934 add_property(buffer);
1935 }
1936 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1937 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1938 }
1939 #endif
1940
1941 if (AggressiveOpts) {
1942 // Sample flag setting code
1943 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1944 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1945 // }
1946 }
1947 }
1948
1949 //===========================================================================================================
1950 // Parsing of java.compiler property
1951
1952 void Arguments::process_java_compiler_argument(char* arg) {
1953 // For backwards compatibility, Djava.compiler=NONE or ""
1954 // causes us to switch to -Xint mode UNLESS -Xdebug
1955 // is also specified.
1956 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1957 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1958 }
1959 }
1960
1961 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1962 _sun_java_launcher = os::strdup_check_oom(launcher);
1963 }
1964
1965 bool Arguments::created_by_java_launcher() {
1966 assert(_sun_java_launcher != NULL, "property must have value");
1967 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1968 }
1969
1970 bool Arguments::sun_java_launcher_is_altjvm() {
1971 return _sun_java_launcher_is_altjvm;
1972 }
1973
1974 //===========================================================================================================
1975 // Parsing of main arguments
1976
1977 bool Arguments::verify_interval(uintx val, uintx min,
1978 uintx max, const char* name) {
1979 // Returns true iff value is in the inclusive interval [min..max]
1980 // false, otherwise.
1981 if (val >= min && val <= max) {
1982 return true;
1983 }
1984 jio_fprintf(defaultStream::error_stream(),
1985 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1986 " and " UINTX_FORMAT "\n",
1987 name, val, min, max);
1988 return false;
1989 }
1990
1991 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1992 // Returns true if given value is at least specified min threshold
1993 // false, otherwise.
1994 if (val >= min ) {
1995 return true;
1996 }
1997 jio_fprintf(defaultStream::error_stream(),
1998 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1999 name, val, min);
2000 return false;
2001 }
2002
2003 bool Arguments::verify_percentage(uintx value, const char* name) {
2004 if (is_percentage(value)) {
2005 return true;
2006 }
2007 jio_fprintf(defaultStream::error_stream(),
2008 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2009 name, value);
2010 return false;
2011 }
2012
2013 // check if do gclog rotation
2014 // +UseGCLogFileRotation is a must,
2015 // no gc log rotation when log file not supplied or
2016 // NumberOfGCLogFiles is 0
2017 void check_gclog_consistency() {
2018 if (UseGCLogFileRotation) {
2019 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2020 jio_fprintf(defaultStream::output_stream(),
2021 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2022 "where num_of_file > 0\n"
2023 "GC log rotation is turned off\n");
2024 UseGCLogFileRotation = false;
2025 }
2026 }
2027
2028 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2029 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2030 jio_fprintf(defaultStream::output_stream(),
2031 "GCLogFileSize changed to minimum 8K\n");
2032 }
2033 }
2034
2035 // This function is called for -Xloggc:<filename>, it can be used
2036 // to check if a given file name(or string) conforms to the following
2037 // specification:
2038 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2039 // %p and %t only allowed once. We only limit usage of filename not path
2040 bool is_filename_valid(const char *file_name) {
2041 const char* p = file_name;
2042 char file_sep = os::file_separator()[0];
2043 const char* cp;
2044 // skip prefix path
2045 for (cp = file_name; *cp != '\0'; cp++) {
2046 if (*cp == '/' || *cp == file_sep) {
2047 p = cp + 1;
2048 }
2049 }
2050
2051 int count_p = 0;
2052 int count_t = 0;
2053 while (*p != '\0') {
2054 if ((*p >= '0' && *p <= '9') ||
2055 (*p >= 'A' && *p <= 'Z') ||
2056 (*p >= 'a' && *p <= 'z') ||
2057 *p == '-' ||
2058 *p == '_' ||
2059 *p == '.') {
2060 p++;
2061 continue;
2062 }
2063 if (*p == '%') {
2064 if(*(p + 1) == 'p') {
2065 p += 2;
2066 count_p ++;
2067 continue;
2068 }
2069 if (*(p + 1) == 't') {
2070 p += 2;
2071 count_t ++;
2072 continue;
2073 }
2074 }
2075 return false;
2076 }
2077 return count_p < 2 && count_t < 2;
2078 }
2079
2080 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2081 if (!is_percentage(min_heap_free_ratio)) {
2082 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2083 return false;
2084 }
2085 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2086 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2087 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2088 MaxHeapFreeRatio);
2089 return false;
2090 }
2091 // This does not set the flag itself, but stores the value in a safe place for later usage.
2092 _min_heap_free_ratio = min_heap_free_ratio;
2093 return true;
2094 }
2095
2096 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2097 if (!is_percentage(max_heap_free_ratio)) {
2098 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2099 return false;
2100 }
2101 if (max_heap_free_ratio < MinHeapFreeRatio) {
2102 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2103 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2104 MinHeapFreeRatio);
2105 return false;
2106 }
2107 // This does not set the flag itself, but stores the value in a safe place for later usage.
2108 _max_heap_free_ratio = max_heap_free_ratio;
2109 return true;
2110 }
2111
2112 // Check consistency of GC selection
2113 bool Arguments::check_gc_consistency_user() {
2114 check_gclog_consistency();
2115 bool status = true;
2116 // Ensure that the user has not selected conflicting sets
2117 // of collectors. [Note: this check is merely a user convenience;
2118 // collectors over-ride each other so that only a non-conflicting
2119 // set is selected; however what the user gets is not what they
2120 // may have expected from the combination they asked for. It's
2121 // better to reduce user confusion by not allowing them to
2122 // select conflicting combinations.
2123 uint i = 0;
2124 if (UseSerialGC) i++;
2125 if (UseConcMarkSweepGC || UseParNewGC) i++;
2126 if (UseParallelGC || UseParallelOldGC) i++;
2127 if (UseG1GC) i++;
2128 if (i > 1) {
2129 jio_fprintf(defaultStream::error_stream(),
2130 "Conflicting collector combinations in option list; "
2131 "please refer to the release notes for the combinations "
2132 "allowed\n");
2133 status = false;
2134 }
2135 return status;
2136 }
2137
2138 void Arguments::check_deprecated_gcs() {
2139 if (UseConcMarkSweepGC && !UseParNewGC) {
2140 warning("Using the DefNew young collector with the CMS collector is deprecated "
2141 "and will likely be removed in a future release");
2142 }
2143
2144 if (UseParNewGC && !UseConcMarkSweepGC) {
2145 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2146 // set up UseSerialGC properly, so that can't be used in the check here.
2147 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2148 "and will likely be removed in a future release");
2149 }
2150 }
2151
2152 void Arguments::check_deprecated_gc_flags() {
2153 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2154 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2155 "and will likely be removed in future release");
2156 }
2157 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2158 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2159 "Use MaxRAMFraction instead.");
2160 }
2161 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2162 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2163 }
2164 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2165 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2166 }
2167 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2168 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2169 }
2170 }
2171
2172 // Check stack pages settings
2173 bool Arguments::check_stack_pages()
2174 {
2175 bool status = true;
2176 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2177 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2178 // greater stack shadow pages can't generate instruction to bang stack
2179 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2180 return status;
2181 }
2182
2183 // Check the consistency of vm_init_args
2184 bool Arguments::check_vm_args_consistency() {
2185 // Method for adding checks for flag consistency.
2186 // The intent is to warn the user of all possible conflicts,
2187 // before returning an error.
2188 // Note: Needs platform-dependent factoring.
2189 bool status = true;
2190
2191 if (TLABRefillWasteFraction == 0) {
2192 jio_fprintf(defaultStream::error_stream(),
2193 "TLABRefillWasteFraction should be a denominator, "
2194 "not " SIZE_FORMAT "\n",
2195 TLABRefillWasteFraction);
2196 status = false;
2197 }
2198
2199 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2200 "AdaptiveSizePolicyWeight");
2201 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2202
2203 // Divide by bucket size to prevent a large size from causing rollover when
2204 // calculating amount of memory needed to be allocated for the String table.
2205 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2206 (max_uintx / StringTable::bucket_size()), "StringTable size");
2207
2208 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2209 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2210
2211 {
2212 // Using "else if" below to avoid printing two error messages if min > max.
2213 // This will also prevent us from reporting both min>100 and max>100 at the
2214 // same time, but that is less annoying than printing two identical errors IMHO.
2215 FormatBuffer<80> err_msg("%s","");
2216 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2217 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2218 status = false;
2219 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2220 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2221 status = false;
2222 }
2223 }
2224
2225 // Min/MaxMetaspaceFreeRatio
2226 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2227 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2228
2229 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2232 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2233 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2234 MinMetaspaceFreeRatio,
2235 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2236 MaxMetaspaceFreeRatio);
2237 status = false;
2238 }
2239
2240 // Trying to keep 100% free is not practical
2241 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2242
2243 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2244 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2245 }
2246
2247 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2248 // Settings to encourage splitting.
2249 if (!FLAG_IS_CMDLINE(NewRatio)) {
2250 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2251 }
2252 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2253 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2254 }
2255 }
2256
2257 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2258 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2259 }
2260
2261 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2262 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2263 if (GCTimeLimit == 100) {
2264 // Turn off gc-overhead-limit-exceeded checks
2265 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2266 }
2267
2268 status = status && ArgumentsExt::check_gc_consistency_user();
2269 status = status && check_stack_pages();
2270
2271 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2272 "CMSIncrementalSafetyFactor");
2273
2274 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2275 // insists that we hold the requisite locks so that the iteration is
2276 // MT-safe. For the verification at start-up and shut-down, we don't
2277 // yet have a good way of acquiring and releasing these locks,
2278 // which are not visible at the CollectedHeap level. We want to
2279 // be able to acquire these locks and then do the iteration rather
2280 // than just disable the lock verification. This will be fixed under
2281 // bug 4788986.
2282 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2283 if (VerifyDuringStartup) {
2284 warning("Heap verification at start-up disabled "
2285 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2286 VerifyDuringStartup = false; // Disable verification at start-up
2287 }
2288
2289 if (VerifyBeforeExit) {
2290 warning("Heap verification at shutdown disabled "
2291 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2292 VerifyBeforeExit = false; // Disable verification at shutdown
2293 }
2294 }
2295
2296 // Note: only executed in non-PRODUCT mode
2297 if (!UseAsyncConcMarkSweepGC &&
2298 (ExplicitGCInvokesConcurrent ||
2299 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2302 " with -UseAsyncConcMarkSweepGC");
2303 status = false;
2304 }
2305
2306 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2307
2308 #if INCLUDE_ALL_GCS
2309 if (UseG1GC) {
2310 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2311 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2312 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2313
2314 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2315 "InitiatingHeapOccupancyPercent");
2316 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2317 "G1RefProcDrainInterval");
2318 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2319 "G1ConcMarkStepDurationMillis");
2320 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2321 "G1ConcRSHotCardLimit");
2322 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2323 "G1ConcRSLogCacheSize");
2324 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2325 "StringDeduplicationAgeThreshold");
2326 }
2327 if (UseConcMarkSweepGC) {
2328 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2329 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2330 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2331 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2332
2333 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2334
2335 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2336 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2337 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2338
2339 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2340
2341 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2342 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2343
2344 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2345 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2346 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2347
2348 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2349
2350 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2351
2352 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2353 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2354 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2355 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2356 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2357 }
2358
2359 if (UseParallelGC || UseParallelOldGC) {
2360 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2361 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2362
2363 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2364 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2365
2366 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2367 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2368
2369 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2370
2371 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2372 }
2373 #endif // INCLUDE_ALL_GCS
2374
2375 status = status && verify_interval(RefDiscoveryPolicy,
2376 ReferenceProcessor::DiscoveryPolicyMin,
2377 ReferenceProcessor::DiscoveryPolicyMax,
2378 "RefDiscoveryPolicy");
2379
2380 // Limit the lower bound of this flag to 1 as it is used in a division
2381 // expression.
2382 status = status && verify_interval(TLABWasteTargetPercent,
2383 1, 100, "TLABWasteTargetPercent");
2384
2385 status = status && verify_object_alignment();
2386
2387 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2388 "CompressedClassSpaceSize");
2389
2390 status = status && verify_interval(MarkStackSizeMax,
2391 1, (max_jint - 1), "MarkStackSizeMax");
2392 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2393
2394 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2395
2396 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2397
2398 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2399
2400 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2401 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2402
2403 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2404
2405 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2406 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2407 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2408 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2409
2410 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2411 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2412
2413 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2414 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2415 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2416
2417 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2418 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2419
2420 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2421 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2422 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2423 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2424
2425 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2426 #ifdef COMPILER1
2427 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2428 #endif
2429
2430 if (PrintNMTStatistics) {
2431 #if INCLUDE_NMT
2432 if (MemTracker::tracking_level() == NMT_off) {
2433 #endif // INCLUDE_NMT
2434 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2435 PrintNMTStatistics = false;
2436 #if INCLUDE_NMT
2437 }
2438 #endif
2439 }
2440
2441 // Need to limit the extent of the padding to reasonable size.
2442 // 8K is well beyond the reasonable HW cache line size, even with the
2443 // aggressive prefetching, while still leaving the room for segregating
2444 // among the distinct pages.
2445 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2448 ContendedPaddingWidth, 0, 8192);
2449 status = false;
2450 }
2451
2452 // Need to enforce the padding not to break the existing field alignments.
2453 // It is sufficient to check against the largest type size.
2454 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2457 ContendedPaddingWidth, BytesPerLong);
2458 status = false;
2459 }
2460
2461 // Check lower bounds of the code cache
2462 // Template Interpreter code is approximately 3X larger in debug builds.
2463 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2464 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2467 os::vm_page_size()/K);
2468 status = false;
2469 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2472 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2473 status = false;
2474 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2477 min_code_cache_size/K);
2478 status = false;
2479 } else if (ReservedCodeCacheSize > 2*G) {
2480 // Code cache size larger than MAXINT is not supported.
2481 jio_fprintf(defaultStream::error_stream(),
2482 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2483 (2*G)/M);
2484 status = false;
2485 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2488 min_code_cache_size/K);
2489 status = false;
2490 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2491 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2492 jio_fprintf(defaultStream::error_stream(),
2493 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2494 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2495 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2496 status = false;
2497 }
2498
2499 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2500 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2501 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2502 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2503
2504 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2505 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2506 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2507 // Check the minimum number of compiler threads
2508 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2509
2510 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2511 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2512 }
2513
2514 return status;
2515 }
2516
2517 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2518 const char* option_type) {
2519 if (ignore) return false;
2520
2521 const char* spacer = " ";
2522 if (option_type == NULL) {
2523 option_type = ++spacer; // Set both to the empty string.
2524 }
2525
2526 if (os::obsolete_option(option)) {
2527 jio_fprintf(defaultStream::error_stream(),
2528 "Obsolete %s%soption: %s\n", option_type, spacer,
2529 option->optionString);
2530 return false;
2531 } else {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Unrecognized %s%soption: %s\n", option_type, spacer,
2534 option->optionString);
2535 return true;
2536 }
2537 }
2538
2539 static const char* user_assertion_options[] = {
2540 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2541 };
2542
2543 static const char* system_assertion_options[] = {
2544 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2545 };
2546
2547 // Return true if any of the strings in null-terminated array 'names' matches.
2548 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2549 // the option must match exactly.
2550 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2551 bool tail_allowed) {
2552 for (/* empty */; *names != NULL; ++names) {
2553 if (match_option(option, *names, tail)) {
2554 if (**tail == '\0' || tail_allowed && **tail == ':') {
2555 return true;
2556 }
2557 }
2558 }
2559 return false;
2560 }
2561
2562 bool Arguments::parse_uintx(const char* value,
2563 uintx* uintx_arg,
2564 uintx min_size) {
2565
2566 // Check the sign first since atomull() parses only unsigned values.
2567 bool value_is_positive = !(*value == '-');
2568
2569 if (value_is_positive) {
2570 julong n;
2571 bool good_return = atomull(value, &n);
2572 if (good_return) {
2573 bool above_minimum = n >= min_size;
2574 bool value_is_too_large = n > max_uintx;
2575
2576 if (above_minimum && !value_is_too_large) {
2577 *uintx_arg = n;
2578 return true;
2579 }
2580 }
2581 }
2582 return false;
2583 }
2584
2585 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2586 julong* long_arg,
2587 julong min_size) {
2588 if (!atomull(s, long_arg)) return arg_unreadable;
2589 return check_memory_size(*long_arg, min_size);
2590 }
2591
2592 // Parse JavaVMInitArgs structure
2593
2594 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2595 // For components of the system classpath.
2596 SysClassPath scp(Arguments::get_sysclasspath());
2597 bool scp_assembly_required = false;
2598
2599 // Save default settings for some mode flags
2600 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2601 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2602 Arguments::_ClipInlining = ClipInlining;
2603 Arguments::_BackgroundCompilation = BackgroundCompilation;
2604
2605 // Setup flags for mixed which is the default
2606 set_mode_flags(_mixed);
2607
2608 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2609 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2610 if (result != JNI_OK) {
2611 return result;
2612 }
2613
2614 // Parse JavaVMInitArgs structure passed in
2615 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2616 if (result != JNI_OK) {
2617 return result;
2618 }
2619
2620 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2621 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2622 if (result != JNI_OK) {
2623 return result;
2624 }
2625
2626 // Do final processing now that all arguments have been parsed
2627 result = finalize_vm_init_args(&scp, scp_assembly_required);
2628 if (result != JNI_OK) {
2629 return result;
2630 }
2631
2632 return JNI_OK;
2633 }
2634
2635 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2636 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2637 // are dealing with -agentpath (case where name is a path), otherwise with
2638 // -agentlib
2639 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2640 char *_name;
2641 const char *_hprof = "hprof", *_jdwp = "jdwp";
2642 size_t _len_hprof, _len_jdwp, _len_prefix;
2643
2644 if (is_path) {
2645 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2646 return false;
2647 }
2648
2649 _name++; // skip past last path separator
2650 _len_prefix = strlen(JNI_LIB_PREFIX);
2651
2652 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2653 return false;
2654 }
2655
2656 _name += _len_prefix;
2657 _len_hprof = strlen(_hprof);
2658 _len_jdwp = strlen(_jdwp);
2659
2660 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2661 _name += _len_hprof;
2662 }
2663 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2664 _name += _len_jdwp;
2665 }
2666 else {
2667 return false;
2668 }
2669
2670 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2671 return false;
2672 }
2673
2674 return true;
2675 }
2676
2677 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2678 return true;
2679 }
2680
2681 return false;
2682 }
2683
2684 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2685 SysClassPath* scp_p,
2686 bool* scp_assembly_required_p,
2687 Flag::Flags origin) {
2688 // Remaining part of option string
2689 const char* tail;
2690
2691 // iterate over arguments
2692 for (int index = 0; index < args->nOptions; index++) {
2693 bool is_absolute_path = false; // for -agentpath vs -agentlib
2694
2695 const JavaVMOption* option = args->options + index;
2696
2697 if (!match_option(option, "-Djava.class.path", &tail) &&
2698 !match_option(option, "-Dsun.java.command", &tail) &&
2699 !match_option(option, "-Dsun.java.launcher", &tail)) {
2700
2701 // add all jvm options to the jvm_args string. This string
2702 // is used later to set the java.vm.args PerfData string constant.
2703 // the -Djava.class.path and the -Dsun.java.command options are
2704 // omitted from jvm_args string as each have their own PerfData
2705 // string constant object.
2706 build_jvm_args(option->optionString);
2707 }
2708
2709 // -verbose:[class/gc/jni]
2710 if (match_option(option, "-verbose", &tail)) {
2711 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2712 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2713 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2714 } else if (!strcmp(tail, ":gc")) {
2715 FLAG_SET_CMDLINE(bool, PrintGC, true);
2716 } else if (!strcmp(tail, ":jni")) {
2717 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2718 }
2719 // -da / -ea / -disableassertions / -enableassertions
2720 // These accept an optional class/package name separated by a colon, e.g.,
2721 // -da:java.lang.Thread.
2722 } else if (match_option(option, user_assertion_options, &tail, true)) {
2723 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2724 if (*tail == '\0') {
2725 JavaAssertions::setUserClassDefault(enable);
2726 } else {
2727 assert(*tail == ':', "bogus match by match_option()");
2728 JavaAssertions::addOption(tail + 1, enable);
2729 }
2730 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2731 } else if (match_option(option, system_assertion_options, &tail, false)) {
2732 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2733 JavaAssertions::setSystemClassDefault(enable);
2734 // -bootclasspath:
2735 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2736 scp_p->reset_path(tail);
2737 *scp_assembly_required_p = true;
2738 // -bootclasspath/a:
2739 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2740 scp_p->add_suffix(tail);
2741 *scp_assembly_required_p = true;
2742 // -bootclasspath/p:
2743 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2744 scp_p->add_prefix(tail);
2745 *scp_assembly_required_p = true;
2746 // -Xrun
2747 } else if (match_option(option, "-Xrun", &tail)) {
2748 if (tail != NULL) {
2749 const char* pos = strchr(tail, ':');
2750 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2751 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2752 name[len] = '\0';
2753
2754 char *options = NULL;
2755 if(pos != NULL) {
2756 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2757 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2758 }
2759 #if !INCLUDE_JVMTI
2760 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2761 jio_fprintf(defaultStream::error_stream(),
2762 "Profiling and debugging agents are not supported in this VM\n");
2763 return JNI_ERR;
2764 }
2765 #endif // !INCLUDE_JVMTI
2766 add_init_library(name, options);
2767 }
2768 // -agentlib and -agentpath
2769 } else if (match_option(option, "-agentlib:", &tail) ||
2770 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2771 if(tail != NULL) {
2772 const char* pos = strchr(tail, '=');
2773 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2774 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2775 name[len] = '\0';
2776
2777 char *options = NULL;
2778 if(pos != NULL) {
2779 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2780 }
2781 #if !INCLUDE_JVMTI
2782 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2783 jio_fprintf(defaultStream::error_stream(),
2784 "Profiling and debugging agents are not supported in this VM\n");
2785 return JNI_ERR;
2786 }
2787 #endif // !INCLUDE_JVMTI
2788 add_init_agent(name, options, is_absolute_path);
2789 }
2790 // -javaagent
2791 } else if (match_option(option, "-javaagent:", &tail)) {
2792 #if !INCLUDE_JVMTI
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Instrumentation agents are not supported in this VM\n");
2795 return JNI_ERR;
2796 #else
2797 if(tail != NULL) {
2798 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2799 add_init_agent("instrument", options, false);
2800 }
2801 #endif // !INCLUDE_JVMTI
2802 // -Xnoclassgc
2803 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2804 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2805 // -Xconcgc
2806 } else if (match_option(option, "-Xconcgc", &tail)) {
2807 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2808 // -Xnoconcgc
2809 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2810 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2811 // -Xbatch
2812 } else if (match_option(option, "-Xbatch", &tail)) {
2813 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2814 // -Xmn for compatibility with other JVM vendors
2815 } else if (match_option(option, "-Xmn", &tail)) {
2816 julong long_initial_young_size = 0;
2817 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2818 if (errcode != arg_in_range) {
2819 jio_fprintf(defaultStream::error_stream(),
2820 "Invalid initial young generation size: %s\n", option->optionString);
2821 describe_range_error(errcode);
2822 return JNI_EINVAL;
2823 }
2824 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2825 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2826 // -Xms
2827 } else if (match_option(option, "-Xms", &tail)) {
2828 julong long_initial_heap_size = 0;
2829 // an initial heap size of 0 means automatically determine
2830 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2831 if (errcode != arg_in_range) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Invalid initial heap size: %s\n", option->optionString);
2834 describe_range_error(errcode);
2835 return JNI_EINVAL;
2836 }
2837 set_min_heap_size((uintx)long_initial_heap_size);
2838 // Currently the minimum size and the initial heap sizes are the same.
2839 // Can be overridden with -XX:InitialHeapSize.
2840 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2841 // -Xmx
2842 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2843 julong long_max_heap_size = 0;
2844 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2845 if (errcode != arg_in_range) {
2846 jio_fprintf(defaultStream::error_stream(),
2847 "Invalid maximum heap size: %s\n", option->optionString);
2848 describe_range_error(errcode);
2849 return JNI_EINVAL;
2850 }
2851 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2852 // Xmaxf
2853 } else if (match_option(option, "-Xmaxf", &tail)) {
2854 char* err;
2855 int maxf = (int)(strtod(tail, &err) * 100);
2856 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Bad max heap free percentage size: %s\n",
2859 option->optionString);
2860 return JNI_EINVAL;
2861 } else {
2862 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2863 }
2864 // Xminf
2865 } else if (match_option(option, "-Xminf", &tail)) {
2866 char* err;
2867 int minf = (int)(strtod(tail, &err) * 100);
2868 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Bad min heap free percentage size: %s\n",
2871 option->optionString);
2872 return JNI_EINVAL;
2873 } else {
2874 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2875 }
2876 // -Xss
2877 } else if (match_option(option, "-Xss", &tail)) {
2878 julong long_ThreadStackSize = 0;
2879 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2880 if (errcode != arg_in_range) {
2881 jio_fprintf(defaultStream::error_stream(),
2882 "Invalid thread stack size: %s\n", option->optionString);
2883 describe_range_error(errcode);
2884 return JNI_EINVAL;
2885 }
2886 // Internally track ThreadStackSize in units of 1024 bytes.
2887 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2888 round_to((int)long_ThreadStackSize, K) / K);
2889 // -Xoss
2890 } else if (match_option(option, "-Xoss", &tail)) {
2891 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2892 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2893 julong long_CodeCacheExpansionSize = 0;
2894 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2895 if (errcode != arg_in_range) {
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2898 os::vm_page_size()/K);
2899 return JNI_EINVAL;
2900 }
2901 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2902 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2903 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2904 julong long_ReservedCodeCacheSize = 0;
2905
2906 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2907 if (errcode != arg_in_range) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid maximum code cache size: %s.\n", option->optionString);
2910 return JNI_EINVAL;
2911 }
2912 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2913 // -XX:NonNMethodCodeHeapSize=
2914 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2915 julong long_NonNMethodCodeHeapSize = 0;
2916
2917 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2918 if (errcode != arg_in_range) {
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2921 return JNI_EINVAL;
2922 }
2923 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2924 // -XX:ProfiledCodeHeapSize=
2925 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2926 julong long_ProfiledCodeHeapSize = 0;
2927
2928 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2929 if (errcode != arg_in_range) {
2930 jio_fprintf(defaultStream::error_stream(),
2931 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2935 // -XX:NonProfiledCodeHeapSizee=
2936 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2937 julong long_NonProfiledCodeHeapSize = 0;
2938
2939 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2943 return JNI_EINVAL;
2944 }
2945 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2946 //-XX:IncreaseFirstTierCompileThresholdAt=
2947 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2948 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2949 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2950 jio_fprintf(defaultStream::error_stream(),
2951 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2952 option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2956 // -green
2957 } else if (match_option(option, "-green", &tail)) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Green threads support not available\n");
2960 return JNI_EINVAL;
2961 // -native
2962 } else if (match_option(option, "-native", &tail)) {
2963 // HotSpot always uses native threads, ignore silently for compatibility
2964 // -Xsqnopause
2965 } else if (match_option(option, "-Xsqnopause", &tail)) {
2966 // EVM option, ignore silently for compatibility
2967 // -Xrs
2968 } else if (match_option(option, "-Xrs", &tail)) {
2969 // Classic/EVM option, new functionality
2970 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2971 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2972 // change default internal VM signals used - lower case for back compat
2973 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2974 // -Xoptimize
2975 } else if (match_option(option, "-Xoptimize", &tail)) {
2976 // EVM option, ignore silently for compatibility
2977 // -Xprof
2978 } else if (match_option(option, "-Xprof", &tail)) {
2979 #if INCLUDE_FPROF
2980 _has_profile = true;
2981 #else // INCLUDE_FPROF
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Flat profiling is not supported in this VM.\n");
2984 return JNI_ERR;
2985 #endif // INCLUDE_FPROF
2986 // -Xconcurrentio
2987 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2988 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2989 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2990 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2991 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2992 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2993
2994 // -Xinternalversion
2995 } else if (match_option(option, "-Xinternalversion", &tail)) {
2996 jio_fprintf(defaultStream::output_stream(), "%s\n",
2997 VM_Version::internal_vm_info_string());
2998 vm_exit(0);
2999 #ifndef PRODUCT
3000 // -Xprintflags
3001 } else if (match_option(option, "-Xprintflags", &tail)) {
3002 CommandLineFlags::printFlags(tty, false);
3003 vm_exit(0);
3004 #endif
3005 // -D
3006 } else if (match_option(option, "-D", &tail)) {
3007 if (!add_property(tail)) {
3008 return JNI_ENOMEM;
3009 }
3010 // Out of the box management support
3011 if (match_option(option, "-Dcom.sun.management", &tail)) {
3012 #if INCLUDE_MANAGEMENT
3013 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3014 #else
3015 jio_fprintf(defaultStream::output_stream(),
3016 "-Dcom.sun.management is not supported in this VM.\n");
3017 return JNI_ERR;
3018 #endif
3019 }
3020 // -Xint
3021 } else if (match_option(option, "-Xint", &tail)) {
3022 set_mode_flags(_int);
3023 // -Xmixed
3024 } else if (match_option(option, "-Xmixed", &tail)) {
3025 set_mode_flags(_mixed);
3026 // -Xcomp
3027 } else if (match_option(option, "-Xcomp", &tail)) {
3028 // for testing the compiler; turn off all flags that inhibit compilation
3029 set_mode_flags(_comp);
3030 // -Xshare:dump
3031 } else if (match_option(option, "-Xshare:dump", &tail)) {
3032 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3033 set_mode_flags(_int); // Prevent compilation, which creates objects
3034 // -Xshare:on
3035 } else if (match_option(option, "-Xshare:on", &tail)) {
3036 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3037 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3038 // -Xshare:auto
3039 } else if (match_option(option, "-Xshare:auto", &tail)) {
3040 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3041 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3042 // -Xshare:off
3043 } else if (match_option(option, "-Xshare:off", &tail)) {
3044 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3045 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3046 // -Xverify
3047 } else if (match_option(option, "-Xverify", &tail)) {
3048 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3049 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3050 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3051 } else if (strcmp(tail, ":remote") == 0) {
3052 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3053 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3054 } else if (strcmp(tail, ":none") == 0) {
3055 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3056 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3057 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xdebug
3061 } else if (match_option(option, "-Xdebug", &tail)) {
3062 // note this flag has been used, then ignore
3063 set_xdebug_mode(true);
3064 // -Xnoagent
3065 } else if (match_option(option, "-Xnoagent", &tail)) {
3066 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3067 } else if (match_option(option, "-Xboundthreads", &tail)) {
3068 // Bind user level threads to kernel threads (Solaris only)
3069 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3070 } else if (match_option(option, "-Xloggc:", &tail)) {
3071 // Redirect GC output to the file. -Xloggc:<filename>
3072 // ostream_init_log(), when called will use this filename
3073 // to initialize a fileStream.
3074 _gc_log_filename = os::strdup_check_oom(tail);
3075 if (!is_filename_valid(_gc_log_filename)) {
3076 jio_fprintf(defaultStream::output_stream(),
3077 "Invalid file name for use with -Xloggc: Filename can only contain the "
3078 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3079 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3080 return JNI_EINVAL;
3081 }
3082 FLAG_SET_CMDLINE(bool, PrintGC, true);
3083 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3084
3085 // JNI hooks
3086 } else if (match_option(option, "-Xcheck", &tail)) {
3087 if (!strcmp(tail, ":jni")) {
3088 #if !INCLUDE_JNI_CHECK
3089 warning("JNI CHECKING is not supported in this VM");
3090 #else
3091 CheckJNICalls = true;
3092 #endif // INCLUDE_JNI_CHECK
3093 } else if (is_bad_option(option, args->ignoreUnrecognized,
3094 "check")) {
3095 return JNI_EINVAL;
3096 }
3097 } else if (match_option(option, "vfprintf", &tail)) {
3098 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3099 } else if (match_option(option, "exit", &tail)) {
3100 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3101 } else if (match_option(option, "abort", &tail)) {
3102 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3103 // -XX:+AggressiveHeap
3104 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3105
3106 // This option inspects the machine and attempts to set various
3107 // parameters to be optimal for long-running, memory allocation
3108 // intensive jobs. It is intended for machines with large
3109 // amounts of cpu and memory.
3110
3111 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3112 // VM, but we may not be able to represent the total physical memory
3113 // available (like having 8gb of memory on a box but using a 32bit VM).
3114 // Thus, we need to make sure we're using a julong for intermediate
3115 // calculations.
3116 julong initHeapSize;
3117 julong total_memory = os::physical_memory();
3118
3119 if (total_memory < (julong)256*M) {
3120 jio_fprintf(defaultStream::error_stream(),
3121 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3122 vm_exit(1);
3123 }
3124
3125 // The heap size is half of available memory, or (at most)
3126 // all of possible memory less 160mb (leaving room for the OS
3127 // when using ISM). This is the maximum; because adaptive sizing
3128 // is turned on below, the actual space used may be smaller.
3129
3130 initHeapSize = MIN2(total_memory / (julong)2,
3131 total_memory - (julong)160*M);
3132
3133 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3134
3135 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3136 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3137 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3138 // Currently the minimum size and the initial heap sizes are the same.
3139 set_min_heap_size(initHeapSize);
3140 }
3141 if (FLAG_IS_DEFAULT(NewSize)) {
3142 // Make the young generation 3/8ths of the total heap.
3143 FLAG_SET_CMDLINE(uintx, NewSize,
3144 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3145 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3146 }
3147
3148 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3149 FLAG_SET_DEFAULT(UseLargePages, true);
3150 #endif
3151
3152 // Increase some data structure sizes for efficiency
3153 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3154 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3155 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3156
3157 // See the OldPLABSize comment below, but replace 'after promotion'
3158 // with 'after copying'. YoungPLABSize is the size of the survivor
3159 // space per-gc-thread buffers. The default is 4kw.
3160 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3161
3162 // OldPLABSize is the size of the buffers in the old gen that
3163 // UseParallelGC uses to promote live data that doesn't fit in the
3164 // survivor spaces. At any given time, there's one for each gc thread.
3165 // The default size is 1kw. These buffers are rarely used, since the
3166 // survivor spaces are usually big enough. For specjbb, however, there
3167 // are occasions when there's lots of live data in the young gen
3168 // and we end up promoting some of it. We don't have a definite
3169 // explanation for why bumping OldPLABSize helps, but the theory
3170 // is that a bigger PLAB results in retaining something like the
3171 // original allocation order after promotion, which improves mutator
3172 // locality. A minor effect may be that larger PLABs reduce the
3173 // number of PLAB allocation events during gc. The value of 8kw
3174 // was arrived at by experimenting with specjbb.
3175 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3176
3177 // Enable parallel GC and adaptive generation sizing
3178 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3179 FLAG_SET_DEFAULT(ParallelGCThreads,
3180 Abstract_VM_Version::parallel_worker_threads());
3181
3182 // Encourage steady state memory management
3183 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3184
3185 // This appears to improve mutator locality
3186 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3187
3188 // Get around early Solaris scheduling bug
3189 // (affinity vs other jobs on system)
3190 // but disallow DR and offlining (5008695).
3191 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3192
3193 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3194 // and the last option wins.
3195 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3196 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3197 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3198 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3199 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3200 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3201 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3202 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3203 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3204 uintx max_tenuring_thresh = 0;
3205 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3206 jio_fprintf(defaultStream::error_stream(),
3207 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3208 }
3209 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3210
3211 if (MaxTenuringThreshold == 0) {
3212 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3213 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3214 } else {
3215 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3216 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3217 }
3218 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3219 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3220 jio_fprintf(defaultStream::error_stream(),
3221 "Please use CMSClassUnloadingEnabled in place of "
3222 "CMSPermGenSweepingEnabled in the future\n");
3223 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3224 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Please use -XX:+UseGCOverheadLimit in place of "
3227 "-XX:+UseGCTimeLimit in the future\n");
3228 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3229 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Please use -XX:-UseGCOverheadLimit in place of "
3232 "-XX:-UseGCTimeLimit in the future\n");
3233 // The TLE options are for compatibility with 1.3 and will be
3234 // removed without notice in a future release. These options
3235 // are not to be documented.
3236 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3237 // No longer used.
3238 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3239 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3240 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3241 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3242 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3243 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3244 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3245 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3246 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3247 // No longer used.
3248 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3249 julong long_tlab_size = 0;
3250 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3251 if (errcode != arg_in_range) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Invalid TLAB size: %s\n", option->optionString);
3254 describe_range_error(errcode);
3255 return JNI_EINVAL;
3256 }
3257 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3258 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3259 // No longer used.
3260 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3262 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3263 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3264 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3265 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3266 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3267 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3268 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3269 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3270 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3271 #if defined(DTRACE_ENABLED)
3272 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3273 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3274 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3275 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3276 #else // defined(DTRACE_ENABLED)
3277 jio_fprintf(defaultStream::error_stream(),
3278 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3279 return JNI_EINVAL;
3280 #endif // defined(DTRACE_ENABLED)
3281 #ifdef ASSERT
3282 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3283 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3284 // disable scavenge before parallel mark-compact
3285 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3286 #endif
3287 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3288 julong cms_blocks_to_claim = (julong)atol(tail);
3289 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3290 jio_fprintf(defaultStream::error_stream(),
3291 "Please use -XX:OldPLABSize in place of "
3292 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3293 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3294 julong cms_blocks_to_claim = (julong)atol(tail);
3295 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3296 jio_fprintf(defaultStream::error_stream(),
3297 "Please use -XX:OldPLABSize in place of "
3298 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3299 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3300 julong old_plab_size = 0;
3301 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3302 if (errcode != arg_in_range) {
3303 jio_fprintf(defaultStream::error_stream(),
3304 "Invalid old PLAB size: %s\n", option->optionString);
3305 describe_range_error(errcode);
3306 return JNI_EINVAL;
3307 }
3308 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Please use -XX:OldPLABSize in place of "
3311 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3312 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3313 julong young_plab_size = 0;
3314 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3315 if (errcode != arg_in_range) {
3316 jio_fprintf(defaultStream::error_stream(),
3317 "Invalid young PLAB size: %s\n", option->optionString);
3318 describe_range_error(errcode);
3319 return JNI_EINVAL;
3320 }
3321 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Please use -XX:YoungPLABSize in place of "
3324 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3325 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3326 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3327 julong stack_size = 0;
3328 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3329 if (errcode != arg_in_range) {
3330 jio_fprintf(defaultStream::error_stream(),
3331 "Invalid mark stack size: %s\n", option->optionString);
3332 describe_range_error(errcode);
3333 return JNI_EINVAL;
3334 }
3335 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3336 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3337 julong max_stack_size = 0;
3338 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3339 if (errcode != arg_in_range) {
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Invalid maximum mark stack size: %s\n",
3342 option->optionString);
3343 describe_range_error(errcode);
3344 return JNI_EINVAL;
3345 }
3346 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3347 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3348 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3349 uintx conc_threads = 0;
3350 if (!parse_uintx(tail, &conc_threads, 1)) {
3351 jio_fprintf(defaultStream::error_stream(),
3352 "Invalid concurrent threads: %s\n", option->optionString);
3353 return JNI_EINVAL;
3354 }
3355 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3356 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3357 julong max_direct_memory_size = 0;
3358 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3359 if (errcode != arg_in_range) {
3360 jio_fprintf(defaultStream::error_stream(),
3361 "Invalid maximum direct memory size: %s\n",
3362 option->optionString);
3363 describe_range_error(errcode);
3364 return JNI_EINVAL;
3365 }
3366 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3367 #if !INCLUDE_MANAGEMENT
3368 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3369 jio_fprintf(defaultStream::error_stream(),
3370 "ManagementServer is not supported in this VM.\n");
3371 return JNI_ERR;
3372 #endif // INCLUDE_MANAGEMENT
3373 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3374 // Skip -XX:Flags= since that case has already been handled
3375 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3376 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3377 return JNI_EINVAL;
3378 }
3379 }
3380 // Unknown option
3381 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3382 return JNI_ERR;
3383 }
3384 }
3385
3386 // PrintSharedArchiveAndExit will turn on
3387 // -Xshare:on
3388 // -XX:+TraceClassPaths
3389 if (PrintSharedArchiveAndExit) {
3390 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3391 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3392 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3393 }
3394
3395 // Change the default value for flags which have different default values
3396 // when working with older JDKs.
3397 #ifdef LINUX
3398 if (JDK_Version::current().compare_major(6) <= 0 &&
3399 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3400 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3401 }
3402 #endif // LINUX
3403 fix_appclasspath();
3404 return JNI_OK;
3405 }
3406
3407 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3408 //
3409 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3410 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3411 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3412 // path is treated as the current directory.
3413 //
3414 // This causes problems with CDS, which requires that all directories specified in the classpath
3415 // must be empty. In most cases, applications do NOT want to load classes from the current
3416 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3417 // scripts compatible with CDS.
3418 void Arguments::fix_appclasspath() {
3419 if (IgnoreEmptyClassPaths) {
3420 const char separator = *os::path_separator();
3421 const char* src = _java_class_path->value();
3422
3423 // skip over all the leading empty paths
3424 while (*src == separator) {
3425 src ++;
3426 }
3427
3428 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3429 strncpy(copy, src, strlen(src) + 1);
3430
3431 // trim all trailing empty paths
3432 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3433 *tail = '\0';
3434 }
3435
3436 char from[3] = {separator, separator, '\0'};
3437 char to [2] = {separator, '\0'};
3438 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3439 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3440 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3441 }
3442
3443 _java_class_path->set_value(copy);
3444 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3445 }
3446
3447 if (!PrintSharedArchiveAndExit) {
3448 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3449 }
3450 }
3451
3452 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3453 // This must be done after all -D arguments have been processed.
3454 scp_p->expand_endorsed();
3455
3456 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3457 // Assemble the bootclasspath elements into the final path.
3458 Arguments::set_sysclasspath(scp_p->combined_path());
3459 }
3460
3461 // This must be done after all arguments have been processed.
3462 // java_compiler() true means set to "NONE" or empty.
3463 if (java_compiler() && !xdebug_mode()) {
3464 // For backwards compatibility, we switch to interpreted mode if
3465 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3466 // not specified.
3467 set_mode_flags(_int);
3468 }
3469 if (CompileThreshold == 0) {
3470 set_mode_flags(_int);
3471 }
3472
3473 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3474 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3475 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3476 }
3477
3478 #ifndef COMPILER2
3479 // Don't degrade server performance for footprint
3480 if (FLAG_IS_DEFAULT(UseLargePages) &&
3481 MaxHeapSize < LargePageHeapSizeThreshold) {
3482 // No need for large granularity pages w/small heaps.
3483 // Note that large pages are enabled/disabled for both the
3484 // Java heap and the code cache.
3485 FLAG_SET_DEFAULT(UseLargePages, false);
3486 }
3487
3488 #else
3489 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3490 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3491 }
3492 #endif
3493
3494 #ifndef TIERED
3495 // Tiered compilation is undefined.
3496 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3497 #endif
3498
3499 // If we are running in a headless jre, force java.awt.headless property
3500 // to be true unless the property has already been set.
3501 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3502 if (os::is_headless_jre()) {
3503 const char* headless = Arguments::get_property("java.awt.headless");
3504 if (headless == NULL) {
3505 char envbuffer[128];
3506 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3507 if (!add_property("java.awt.headless=true")) {
3508 return JNI_ENOMEM;
3509 }
3510 } else {
3511 char buffer[256];
3512 strcpy(buffer, "java.awt.headless=");
3513 strcat(buffer, envbuffer);
3514 if (!add_property(buffer)) {
3515 return JNI_ENOMEM;
3516 }
3517 }
3518 }
3519 }
3520
3521 if (!ArgumentsExt::check_vm_args_consistency()) {
3522 return JNI_ERR;
3523 }
3524
3525 return JNI_OK;
3526 }
3527
3528 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3529 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3530 scp_assembly_required_p);
3531 }
3532
3533 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3534 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3535 scp_assembly_required_p);
3536 }
3537
3538 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3539 const int N_MAX_OPTIONS = 64;
3540 const int OPTION_BUFFER_SIZE = 1024;
3541 char buffer[OPTION_BUFFER_SIZE];
3542
3543 // The variable will be ignored if it exceeds the length of the buffer.
3544 // Don't check this variable if user has special privileges
3545 // (e.g. unix su command).
3546 if (os::getenv(name, buffer, sizeof(buffer)) &&
3547 !os::have_special_privileges()) {
3548 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3549 jio_fprintf(defaultStream::error_stream(),
3550 "Picked up %s: %s\n", name, buffer);
3551 char* rd = buffer; // pointer to the input string (rd)
3552 int i;
3553 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3554 while (isspace(*rd)) rd++; // skip whitespace
3555 if (*rd == 0) break; // we re done when the input string is read completely
3556
3557 // The output, option string, overwrites the input string.
3558 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3559 // input string (rd).
3560 char* wrt = rd;
3561
3562 options[i++].optionString = wrt; // Fill in option
3563 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3564 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3565 int quote = *rd; // matching quote to look for
3566 rd++; // don't copy open quote
3567 while (*rd != quote) { // include everything (even spaces) up until quote
3568 if (*rd == 0) { // string termination means unmatched string
3569 jio_fprintf(defaultStream::error_stream(),
3570 "Unmatched quote in %s\n", name);
3571 return JNI_ERR;
3572 }
3573 *wrt++ = *rd++; // copy to option string
3574 }
3575 rd++; // don't copy close quote
3576 } else {
3577 *wrt++ = *rd++; // copy to option string
3578 }
3579 }
3580 // Need to check if we're done before writing a NULL,
3581 // because the write could be to the byte that rd is pointing to.
3582 if (*rd++ == 0) {
3583 *wrt = 0;
3584 break;
3585 }
3586 *wrt = 0; // Zero terminate option
3587 }
3588 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3589 JavaVMInitArgs vm_args;
3590 vm_args.version = JNI_VERSION_1_2;
3591 vm_args.options = options;
3592 vm_args.nOptions = i;
3593 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3594
3595 if (PrintVMOptions) {
3596 const char* tail;
3597 for (int i = 0; i < vm_args.nOptions; i++) {
3598 const JavaVMOption *option = vm_args.options + i;
3599 if (match_option(option, "-XX:", &tail)) {
3600 logOption(tail);
3601 }
3602 }
3603 }
3604
3605 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3606 }
3607 return JNI_OK;
3608 }
3609
3610 void Arguments::set_shared_spaces_flags() {
3611 if (DumpSharedSpaces) {
3612 if (RequireSharedSpaces) {
3613 warning("cannot dump shared archive while using shared archive");
3614 }
3615 UseSharedSpaces = false;
3616 #ifdef _LP64
3617 if (!UseCompressedOops || !UseCompressedClassPointers) {
3618 vm_exit_during_initialization(
3619 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3620 }
3621 } else {
3622 if (!UseCompressedOops || !UseCompressedClassPointers) {
3623 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3624 }
3625 #endif
3626 }
3627 }
3628
3629 #if !INCLUDE_ALL_GCS
3630 static void force_serial_gc() {
3631 FLAG_SET_DEFAULT(UseSerialGC, true);
3632 UNSUPPORTED_GC_OPTION(UseG1GC);
3633 UNSUPPORTED_GC_OPTION(UseParallelGC);
3634 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3635 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3636 UNSUPPORTED_GC_OPTION(UseParNewGC);
3637 }
3638 #endif // INCLUDE_ALL_GCS
3639
3640 // Sharing support
3641 // Construct the path to the archive
3642 static char* get_shared_archive_path() {
3643 char *shared_archive_path;
3644 if (SharedArchiveFile == NULL) {
3645 char jvm_path[JVM_MAXPATHLEN];
3646 os::jvm_path(jvm_path, sizeof(jvm_path));
3647 char *end = strrchr(jvm_path, *os::file_separator());
3648 if (end != NULL) *end = '\0';
3649 size_t jvm_path_len = strlen(jvm_path);
3650 size_t file_sep_len = strlen(os::file_separator());
3651 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3652 file_sep_len + 20, mtInternal);
3653 if (shared_archive_path != NULL) {
3654 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3655 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3656 strncat(shared_archive_path, "classes.jsa", 11);
3657 }
3658 } else {
3659 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3660 if (shared_archive_path != NULL) {
3661 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3662 }
3663 }
3664 return shared_archive_path;
3665 }
3666
3667 #ifndef PRODUCT
3668 // Determine whether LogVMOutput should be implicitly turned on.
3669 static bool use_vm_log() {
3670 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3671 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3672 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3673 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3674 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3675 return true;
3676 }
3677
3678 #ifdef COMPILER1
3679 if (PrintC1Statistics) {
3680 return true;
3681 }
3682 #endif // COMPILER1
3683
3684 #ifdef COMPILER2
3685 if (PrintOptoAssembly || PrintOptoStatistics) {
3686 return true;
3687 }
3688 #endif // COMPILER2
3689
3690 return false;
3691 }
3692 #endif // PRODUCT
3693
3694 // Parse entry point called from JNI_CreateJavaVM
3695
3696 jint Arguments::parse(const JavaVMInitArgs* args) {
3697
3698 // Remaining part of option string
3699 const char* tail;
3700
3701 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3702 const char* hotspotrc = ".hotspotrc";
3703 bool settings_file_specified = false;
3704 bool needs_hotspotrc_warning = false;
3705
3706 const char* flags_file;
3707 int index;
3708 for (index = 0; index < args->nOptions; index++) {
3709 const JavaVMOption *option = args->options + index;
3710 if (match_option(option, "-XX:Flags=", &tail)) {
3711 flags_file = tail;
3712 settings_file_specified = true;
3713 }
3714 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3715 PrintVMOptions = true;
3716 }
3717 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3718 PrintVMOptions = false;
3719 }
3720 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3721 IgnoreUnrecognizedVMOptions = true;
3722 }
3723 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3724 IgnoreUnrecognizedVMOptions = false;
3725 }
3726 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3727 CommandLineFlags::printFlags(tty, false);
3728 vm_exit(0);
3729 }
3730 #if INCLUDE_NMT
3731 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3732 // The launcher did not setup nmt environment variable properly.
3733 if (!MemTracker::check_launcher_nmt_support(tail)) {
3734 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3735 }
3736
3737 // Verify if nmt option is valid.
3738 if (MemTracker::verify_nmt_option()) {
3739 // Late initialization, still in single-threaded mode.
3740 if (MemTracker::tracking_level() >= NMT_summary) {
3741 MemTracker::init();
3742 }
3743 } else {
3744 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3745 }
3746 }
3747 #endif
3748
3749
3750 #ifndef PRODUCT
3751 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3752 CommandLineFlags::printFlags(tty, true);
3753 vm_exit(0);
3754 }
3755 #endif
3756 }
3757
3758 if (IgnoreUnrecognizedVMOptions) {
3759 // uncast const to modify the flag args->ignoreUnrecognized
3760 *(jboolean*)(&args->ignoreUnrecognized) = true;
3761 }
3762
3763 // Parse specified settings file
3764 if (settings_file_specified) {
3765 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3766 return JNI_EINVAL;
3767 }
3768 } else {
3769 #ifdef ASSERT
3770 // Parse default .hotspotrc settings file
3771 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3772 return JNI_EINVAL;
3773 }
3774 #else
3775 struct stat buf;
3776 if (os::stat(hotspotrc, &buf) == 0) {
3777 needs_hotspotrc_warning = true;
3778 }
3779 #endif
3780 }
3781
3782 if (PrintVMOptions) {
3783 for (index = 0; index < args->nOptions; index++) {
3784 const JavaVMOption *option = args->options + index;
3785 if (match_option(option, "-XX:", &tail)) {
3786 logOption(tail);
3787 }
3788 }
3789 }
3790
3791 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3792 jint result = parse_vm_init_args(args);
3793 if (result != JNI_OK) {
3794 return result;
3795 }
3796
3797 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3798 SharedArchivePath = get_shared_archive_path();
3799 if (SharedArchivePath == NULL) {
3800 return JNI_ENOMEM;
3801 }
3802
3803 // Delay warning until here so that we've had a chance to process
3804 // the -XX:-PrintWarnings flag
3805 if (needs_hotspotrc_warning) {
3806 warning("%s file is present but has been ignored. "
3807 "Run with -XX:Flags=%s to load the file.",
3808 hotspotrc, hotspotrc);
3809 }
3810
3811 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3812 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3813 #endif
3814
3815 #if INCLUDE_ALL_GCS
3816 #if (defined JAVASE_EMBEDDED || defined ARM)
3817 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3818 #endif
3819 #endif
3820
3821 #ifndef PRODUCT
3822 if (TraceBytecodesAt != 0) {
3823 TraceBytecodes = true;
3824 }
3825 if (CountCompiledCalls) {
3826 if (UseCounterDecay) {
3827 warning("UseCounterDecay disabled because CountCalls is set");
3828 UseCounterDecay = false;
3829 }
3830 }
3831 #endif // PRODUCT
3832
3833 if (ScavengeRootsInCode == 0) {
3834 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3835 warning("forcing ScavengeRootsInCode non-zero");
3836 }
3837 ScavengeRootsInCode = 1;
3838 }
3839
3840 if (PrintGCDetails) {
3841 // Turn on -verbose:gc options as well
3842 PrintGC = true;
3843 }
3844
3845 // Set object alignment values.
3846 set_object_alignment();
3847
3848 #if !INCLUDE_ALL_GCS
3849 force_serial_gc();
3850 #endif // INCLUDE_ALL_GCS
3851 #if !INCLUDE_CDS
3852 if (DumpSharedSpaces || RequireSharedSpaces) {
3853 jio_fprintf(defaultStream::error_stream(),
3854 "Shared spaces are not supported in this VM\n");
3855 return JNI_ERR;
3856 }
3857 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3858 warning("Shared spaces are not supported in this VM");
3859 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3860 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3861 }
3862 no_shared_spaces("CDS Disabled");
3863 #endif // INCLUDE_CDS
3864
3865 return JNI_OK;
3866 }
3867
3868 jint Arguments::apply_ergo() {
3869
3870 // Set flags based on ergonomics.
3871 set_ergonomics_flags();
3872
3873 set_shared_spaces_flags();
3874
3875 // Check the GC selections again.
3876 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3877 return JNI_EINVAL;
3878 }
3879
3880 if (TieredCompilation) {
3881 set_tiered_flags();
3882 } else {
3883 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3884 if (CompilationPolicyChoice >= 2) {
3885 vm_exit_during_initialization(
3886 "Incompatible compilation policy selected", NULL);
3887 }
3888 }
3889 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3890 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3891 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3892 }
3893
3894
3895 // Set heap size based on available physical memory
3896 set_heap_size();
3897
3898 set_gc_specific_flags();
3899
3900 // Initialize Metaspace flags and alignments
3901 Metaspace::ergo_initialize();
3902
3903 // Set bytecode rewriting flags
3904 set_bytecode_flags();
3905
3906 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3907 set_aggressive_opts_flags();
3908
3909 // Turn off biased locking for locking debug mode flags,
3910 // which are subtly different from each other but neither works with
3911 // biased locking
3912 if (UseHeavyMonitors
3913 #ifdef COMPILER1
3914 || !UseFastLocking
3915 #endif // COMPILER1
3916 ) {
3917 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3918 // flag set to true on command line; warn the user that they
3919 // can't enable biased locking here
3920 warning("Biased Locking is not supported with locking debug flags"
3921 "; ignoring UseBiasedLocking flag." );
3922 }
3923 UseBiasedLocking = false;
3924 }
3925
3926 #ifdef ZERO
3927 // Clear flags not supported on zero.
3928 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3929 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3930 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3931 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3932 #endif // CC_INTERP
3933
3934 #ifdef COMPILER2
3935 if (!EliminateLocks) {
3936 EliminateNestedLocks = false;
3937 }
3938 if (!Inline) {
3939 IncrementalInline = false;
3940 }
3941 #ifndef PRODUCT
3942 if (!IncrementalInline) {
3943 AlwaysIncrementalInline = false;
3944 }
3945 #endif
3946 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3947 // nothing to use the profiling, turn if off
3948 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3949 }
3950 #endif
3951
3952 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3953 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3954 DebugNonSafepoints = true;
3955 }
3956
3957 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3958 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3959 }
3960
3961 #ifndef PRODUCT
3962 if (CompileTheWorld) {
3963 // Force NmethodSweeper to sweep whole CodeCache each time.
3964 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3965 NmethodSweepFraction = 1;
3966 }
3967 }
3968
3969 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3970 if (use_vm_log()) {
3971 LogVMOutput = true;
3972 }
3973 }
3974 #endif // PRODUCT
3975
3976 if (PrintCommandLineFlags) {
3977 CommandLineFlags::printSetFlags(tty);
3978 }
3979
3980 // Apply CPU specific policy for the BiasedLocking
3981 if (UseBiasedLocking) {
3982 if (!VM_Version::use_biased_locking() &&
3983 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3984 UseBiasedLocking = false;
3985 }
3986 }
3987 #ifdef COMPILER2
3988 if (!UseBiasedLocking || EmitSync != 0) {
3989 UseOptoBiasInlining = false;
3990 }
3991 #endif
3992
3993 return JNI_OK;
3994 }
3995
3996 jint Arguments::adjust_after_os() {
3997 if (UseNUMA) {
3998 if (UseParallelGC || UseParallelOldGC) {
3999 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4000 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4001 }
4002 }
4003 // UseNUMAInterleaving is set to ON for all collectors and
4004 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4005 // such as the parallel collector for Linux and Solaris will
4006 // interleave old gen and survivor spaces on top of NUMA
4007 // allocation policy for the eden space.
4008 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4009 // all platforms and ParallelGC on Windows will interleave all
4010 // of the heap spaces across NUMA nodes.
4011 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4012 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4013 }
4014 }
4015 return JNI_OK;
4016 }
4017
4018 int Arguments::PropertyList_count(SystemProperty* pl) {
4019 int count = 0;
4020 while(pl != NULL) {
4021 count++;
4022 pl = pl->next();
4023 }
4024 return count;
4025 }
4026
4027 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4028 assert(key != NULL, "just checking");
4029 SystemProperty* prop;
4030 for (prop = pl; prop != NULL; prop = prop->next()) {
4031 if (strcmp(key, prop->key()) == 0) return prop->value();
4032 }
4033 return NULL;
4034 }
4035
4036 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4037 int count = 0;
4038 const char* ret_val = NULL;
4039
4040 while(pl != NULL) {
4041 if(count >= index) {
4042 ret_val = pl->key();
4043 break;
4044 }
4045 count++;
4046 pl = pl->next();
4047 }
4048
4049 return ret_val;
4050 }
4051
4052 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4053 int count = 0;
4054 char* ret_val = NULL;
4055
4056 while(pl != NULL) {
4057 if(count >= index) {
4058 ret_val = pl->value();
4059 break;
4060 }
4061 count++;
4062 pl = pl->next();
4063 }
4064
4065 return ret_val;
4066 }
4067
4068 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4069 SystemProperty* p = *plist;
4070 if (p == NULL) {
4071 *plist = new_p;
4072 } else {
4073 while (p->next() != NULL) {
4074 p = p->next();
4075 }
4076 p->set_next(new_p);
4077 }
4078 }
4079
4080 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4081 if (plist == NULL)
4082 return;
4083
4084 SystemProperty* new_p = new SystemProperty(k, v, true);
4085 PropertyList_add(plist, new_p);
4086 }
4087
4088 // This add maintains unique property key in the list.
4089 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4090 if (plist == NULL)
4091 return;
4092
4093 // If property key exist then update with new value.
4094 SystemProperty* prop;
4095 for (prop = *plist; prop != NULL; prop = prop->next()) {
4096 if (strcmp(k, prop->key()) == 0) {
4097 if (append) {
4098 prop->append_value(v);
4099 } else {
4100 prop->set_value(v);
4101 }
4102 return;
4103 }
4104 }
4105
4106 PropertyList_add(plist, k, v);
4107 }
4108
4109 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4110 // Returns true if all of the source pointed by src has been copied over to
4111 // the destination buffer pointed by buf. Otherwise, returns false.
4112 // Notes:
4113 // 1. If the length (buflen) of the destination buffer excluding the
4114 // NULL terminator character is not long enough for holding the expanded
4115 // pid characters, it also returns false instead of returning the partially
4116 // expanded one.
4117 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4118 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4119 char* buf, size_t buflen) {
4120 const char* p = src;
4121 char* b = buf;
4122 const char* src_end = &src[srclen];
4123 char* buf_end = &buf[buflen - 1];
4124
4125 while (p < src_end && b < buf_end) {
4126 if (*p == '%') {
4127 switch (*(++p)) {
4128 case '%': // "%%" ==> "%"
4129 *b++ = *p++;
4130 break;
4131 case 'p': { // "%p" ==> current process id
4132 // buf_end points to the character before the last character so
4133 // that we could write '\0' to the end of the buffer.
4134 size_t buf_sz = buf_end - b + 1;
4135 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4136
4137 // if jio_snprintf fails or the buffer is not long enough to hold
4138 // the expanded pid, returns false.
4139 if (ret < 0 || ret >= (int)buf_sz) {
4140 return false;
4141 } else {
4142 b += ret;
4143 assert(*b == '\0', "fail in copy_expand_pid");
4144 if (p == src_end && b == buf_end + 1) {
4145 // reach the end of the buffer.
4146 return true;
4147 }
4148 }
4149 p++;
4150 break;
4151 }
4152 default :
4153 *b++ = '%';
4154 }
4155 } else {
4156 *b++ = *p++;
4157 }
4158 }
4159 *b = '\0';
4160 return (p == src_end); // return false if not all of the source was copied
4161 }