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 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 #ifndef ZERO
313 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 #endif // ZERO
316 { NULL, JDK_Version(0), JDK_Version(0) }
317 };
318
319 // Returns true if the flag is obsolete and fits into the range specified
320 // for being ignored. In the case that the flag is ignored, the 'version'
321 // value is filled in with the version number when the flag became
322 // obsolete so that that value can be displayed to the user.
323 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
324 int i = 0;
325 assert(version != NULL, "Must provide a version buffer");
326 while (obsolete_jvm_flags[i].name != NULL) {
327 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
328 // <flag>=xxx form
329 // [-|+]<flag> form
330 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
331 ((s[0] == '+' || s[0] == '-') &&
332 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
333 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
334 *version = flag_status.obsoleted_in;
335 return true;
336 }
337 }
338 i++;
339 }
340 return false;
341 }
342
343 // Constructs the system class path (aka boot class path) from the following
344 // components, in order:
345 //
346 // prefix // from -Xbootclasspath/p:...
347 // endorsed // the expansion of -Djava.endorsed.dirs=...
348 // base // from os::get_system_properties() or -Xbootclasspath=
349 // suffix // from -Xbootclasspath/a:...
350 //
351 // java.endorsed.dirs is a list of directories; any jar or zip files in the
352 // directories are added to the sysclasspath just before the base.
353 //
354 // This could be AllStatic, but it isn't needed after argument processing is
355 // complete.
356 class SysClassPath: public StackObj {
357 public:
358 SysClassPath(const char* base);
359 ~SysClassPath();
360
361 inline void set_base(const char* base);
362 inline void add_prefix(const char* prefix);
363 inline void add_suffix_to_prefix(const char* suffix);
364 inline void add_suffix(const char* suffix);
365 inline void reset_path(const char* base);
366
367 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
368 // property. Must be called after all command-line arguments have been
369 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
370 // combined_path().
371 void expand_endorsed();
372
373 inline const char* get_base() const { return _items[_scp_base]; }
374 inline const char* get_prefix() const { return _items[_scp_prefix]; }
375 inline const char* get_suffix() const { return _items[_scp_suffix]; }
376 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
377
378 // Combine all the components into a single c-heap-allocated string; caller
379 // must free the string if/when no longer needed.
380 char* combined_path();
381
382 private:
383 // Utility routines.
384 static char* add_to_path(const char* path, const char* str, bool prepend);
385 static char* add_jars_to_path(char* path, const char* directory);
386
387 inline void reset_item_at(int index);
388
389 // Array indices for the items that make up the sysclasspath. All except the
390 // base are allocated in the C heap and freed by this class.
391 enum {
392 _scp_prefix, // from -Xbootclasspath/p:...
393 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
394 _scp_base, // the default sysclasspath
395 _scp_suffix, // from -Xbootclasspath/a:...
396 _scp_nitems // the number of items, must be last.
397 };
398
399 const char* _items[_scp_nitems];
400 DEBUG_ONLY(bool _expansion_done;)
401 };
402
403 SysClassPath::SysClassPath(const char* base) {
404 memset(_items, 0, sizeof(_items));
405 _items[_scp_base] = base;
406 DEBUG_ONLY(_expansion_done = false;)
407 }
408
409 SysClassPath::~SysClassPath() {
410 // Free everything except the base.
411 for (int i = 0; i < _scp_nitems; ++i) {
412 if (i != _scp_base) reset_item_at(i);
413 }
414 DEBUG_ONLY(_expansion_done = false;)
415 }
416
417 inline void SysClassPath::set_base(const char* base) {
418 _items[_scp_base] = base;
419 }
420
421 inline void SysClassPath::add_prefix(const char* prefix) {
422 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
423 }
424
425 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
427 }
428
429 inline void SysClassPath::add_suffix(const char* suffix) {
430 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
431 }
432
433 inline void SysClassPath::reset_item_at(int index) {
434 assert(index < _scp_nitems && index != _scp_base, "just checking");
435 if (_items[index] != NULL) {
436 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
437 _items[index] = NULL;
438 }
439 }
440
441 inline void SysClassPath::reset_path(const char* base) {
442 // Clear the prefix and suffix.
443 reset_item_at(_scp_prefix);
444 reset_item_at(_scp_suffix);
445 set_base(base);
446 }
447
448 //------------------------------------------------------------------------------
449
450 void SysClassPath::expand_endorsed() {
451 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
452
453 const char* path = Arguments::get_property("java.endorsed.dirs");
454 if (path == NULL) {
455 path = Arguments::get_endorsed_dir();
456 assert(path != NULL, "no default for java.endorsed.dirs");
457 }
458
459 char* expanded_path = NULL;
460 const char separator = *os::path_separator();
461 const char* const end = path + strlen(path);
462 while (path < end) {
463 const char* tmp_end = strchr(path, separator);
464 if (tmp_end == NULL) {
465 expanded_path = add_jars_to_path(expanded_path, path);
466 path = end;
467 } else {
468 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
469 memcpy(dirpath, path, tmp_end - path);
470 dirpath[tmp_end - path] = '\0';
471 expanded_path = add_jars_to_path(expanded_path, dirpath);
472 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
473 path = tmp_end + 1;
474 }
475 }
476 _items[_scp_endorsed] = expanded_path;
477 DEBUG_ONLY(_expansion_done = true;)
478 }
479
480 // Combine the bootclasspath elements, some of which may be null, into a single
481 // c-heap-allocated string.
482 char* SysClassPath::combined_path() {
483 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
484 assert(_expansion_done, "must call expand_endorsed() first.");
485
486 size_t lengths[_scp_nitems];
487 size_t total_len = 0;
488
489 const char separator = *os::path_separator();
490
491 // Get the lengths.
492 int i;
493 for (i = 0; i < _scp_nitems; ++i) {
494 if (_items[i] != NULL) {
495 lengths[i] = strlen(_items[i]);
496 // Include space for the separator char (or a NULL for the last item).
497 total_len += lengths[i] + 1;
498 }
499 }
500 assert(total_len > 0, "empty sysclasspath not allowed");
501
502 // Copy the _items to a single string.
503 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
504 char* cp_tmp = cp;
505 for (i = 0; i < _scp_nitems; ++i) {
506 if (_items[i] != NULL) {
507 memcpy(cp_tmp, _items[i], lengths[i]);
508 cp_tmp += lengths[i];
509 *cp_tmp++ = separator;
510 }
511 }
512 *--cp_tmp = '\0'; // Replace the extra separator.
513 return cp;
514 }
515
516 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
517 char*
518 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
519 char *cp;
520
521 assert(str != NULL, "just checking");
522 if (path == NULL) {
523 size_t len = strlen(str) + 1;
524 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
525 memcpy(cp, str, len); // copy the trailing null
526 } else {
527 const char separator = *os::path_separator();
528 size_t old_len = strlen(path);
529 size_t str_len = strlen(str);
530 size_t len = old_len + str_len + 2;
531
532 if (prepend) {
533 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
534 char* cp_tmp = cp;
535 memcpy(cp_tmp, str, str_len);
536 cp_tmp += str_len;
537 *cp_tmp = separator;
538 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
539 FREE_C_HEAP_ARRAY(char, path, mtInternal);
540 } else {
541 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
542 char* cp_tmp = cp + old_len;
543 *cp_tmp = separator;
544 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
545 }
546 }
547 return cp;
548 }
549
550 // Scan the directory and append any jar or zip files found to path.
551 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
552 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
553 DIR* dir = os::opendir(directory);
554 if (dir == NULL) return path;
555
556 char dir_sep[2] = { '\0', '\0' };
557 size_t directory_len = strlen(directory);
558 const char fileSep = *os::file_separator();
559 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
560
561 /* Scan the directory for jars/zips, appending them to path. */
562 struct dirent *entry;
563 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
564 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
565 const char* name = entry->d_name;
566 const char* ext = name + strlen(name) - 4;
567 bool isJarOrZip = ext > name &&
568 (os::file_name_strcmp(ext, ".jar") == 0 ||
569 os::file_name_strcmp(ext, ".zip") == 0);
570 if (isJarOrZip) {
571 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
572 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
573 path = add_to_path(path, jarpath, false);
574 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
575 }
576 }
577 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
578 os::closedir(dir);
579 return path;
580 }
581
582 // Parses a memory size specification string.
583 static bool atomull(const char *s, julong* result) {
584 julong n = 0;
585 int args_read = 0;
586 bool is_hex = false;
587 // Skip leading 0[xX] for hexadecimal
588 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
589 s += 2;
590 is_hex = true;
591 args_read = sscanf(s, JULONG_FORMAT_X, &n);
592 } else {
593 args_read = sscanf(s, JULONG_FORMAT, &n);
594 }
595 if (args_read != 1) {
596 return false;
597 }
598 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
599 s++;
600 }
601 // 4705540: illegal if more characters are found after the first non-digit
602 if (strlen(s) > 1) {
603 return false;
604 }
605 switch (*s) {
606 case 'T': case 't':
607 *result = n * G * K;
608 // Check for overflow.
609 if (*result/((julong)G * K) != n) return false;
610 return true;
611 case 'G': case 'g':
612 *result = n * G;
613 if (*result/G != n) return false;
614 return true;
615 case 'M': case 'm':
616 *result = n * M;
617 if (*result/M != n) return false;
618 return true;
619 case 'K': case 'k':
620 *result = n * K;
621 if (*result/K != n) return false;
622 return true;
623 case '\0':
624 *result = n;
625 return true;
626 default:
627 return false;
628 }
629 }
630
631 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
632 if (size < min_size) return arg_too_small;
633 // Check that size will fit in a size_t (only relevant on 32-bit)
634 if (size > max_uintx) return arg_too_big;
635 return arg_in_range;
636 }
637
638 // Describe an argument out of range error
639 void Arguments::describe_range_error(ArgsRange errcode) {
640 switch(errcode) {
641 case arg_too_big:
642 jio_fprintf(defaultStream::error_stream(),
643 "The specified size exceeds the maximum "
644 "representable size.\n");
645 break;
646 case arg_too_small:
647 case arg_unreadable:
648 case arg_in_range:
649 // do nothing for now
650 break;
651 default:
652 ShouldNotReachHere();
653 }
654 }
655
656 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
657 return CommandLineFlags::boolAtPut(name, &value, origin);
658 }
659
660 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
661 double v;
662 if (sscanf(value, "%lf", &v) != 1) {
663 return false;
664 }
665
666 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
667 return true;
668 }
669 return false;
670 }
671
672 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
673 julong v;
674 intx intx_v;
675 bool is_neg = false;
676 // Check the sign first since atomull() parses only unsigned values.
677 if (*value == '-') {
678 if (!CommandLineFlags::intxAt(name, &intx_v)) {
679 return false;
680 }
681 value++;
682 is_neg = true;
683 }
684 if (!atomull(value, &v)) {
685 return false;
686 }
687 intx_v = (intx) v;
688 if (is_neg) {
689 intx_v = -intx_v;
690 }
691 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
692 return true;
693 }
694 uintx uintx_v = (uintx) v;
695 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
696 return true;
697 }
698 uint64_t uint64_t_v = (uint64_t) v;
699 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
700 return true;
701 }
702 size_t size_t_v = (size_t) v;
703 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
704 return true;
705 }
706 return false;
707 }
708
709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
711 // Contract: CommandLineFlags always returns a pointer that needs freeing.
712 FREE_C_HEAP_ARRAY(char, value, mtInternal);
713 return true;
714 }
715
716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
717 const char* old_value = "";
718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
719 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
720 size_t new_len = strlen(new_value);
721 const char* value;
722 char* free_this_too = NULL;
723 if (old_len == 0) {
724 value = new_value;
725 } else if (new_len == 0) {
726 value = old_value;
727 } else {
728 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
729 // each new setting adds another LINE to the switch:
730 sprintf(buf, "%s\n%s", old_value, new_value);
731 value = buf;
732 free_this_too = buf;
733 }
734 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
735 // CommandLineFlags always returns a pointer that needs freeing.
736 FREE_C_HEAP_ARRAY(char, value, mtInternal);
737 if (free_this_too != NULL) {
738 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
739 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
740 }
741 return true;
742 }
743
744 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
745
746 // range of acceptable characters spelled out for portability reasons
747 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
748 #define BUFLEN 255
749 char name[BUFLEN+1];
750 char dummy;
751
752 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
753 return set_bool_flag(name, false, origin);
754 }
755 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
756 return set_bool_flag(name, true, origin);
757 }
758
759 char punct;
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 Flag* flag = Flag::find_flag(name, strlen(name));
763 if (flag != NULL && flag->is_ccstr()) {
764 if (flag->ccstr_accumulates()) {
765 return append_to_string_flag(name, value, origin);
766 } else {
767 if (value[0] == '\0') {
768 value = NULL;
769 }
770 return set_string_flag(name, value, origin);
771 }
772 }
773 }
774
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
776 const char* value = strchr(arg, '=') + 1;
777 // -XX:Foo:=xxx will reset the string flag to the given value.
778 if (value[0] == '\0') {
779 value = NULL;
780 }
781 return set_string_flag(name, value, origin);
782 }
783
784 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
785 #define SIGNED_NUMBER_RANGE "[-0123456789]"
786 #define NUMBER_RANGE "[0123456789]"
787 char value[BUFLEN + 1];
788 char value2[BUFLEN + 1];
789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
790 // Looks like a floating-point number -- try again with more lenient format string
791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
792 return set_fp_numeric_flag(name, value, origin);
793 }
794 }
795
796 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
797 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
798 return set_numeric_flag(name, value, origin);
799 }
800
801 return false;
802 }
803
804 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
805 assert(bldarray != NULL, "illegal argument");
806
807 if (arg == NULL) {
808 return;
809 }
810
811 int new_count = *count + 1;
812
813 // expand the array and add arg to the last element
814 if (*bldarray == NULL) {
815 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
816 } else {
817 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
818 }
819 (*bldarray)[*count] = os::strdup_check_oom(arg);
820 *count = new_count;
821 }
822
823 void Arguments::build_jvm_args(const char* arg) {
824 add_string(&_jvm_args_array, &_num_jvm_args, arg);
825 }
826
827 void Arguments::build_jvm_flags(const char* arg) {
828 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
829 }
830
831 // utility function to return a string that concatenates all
832 // strings in a given char** array
833 const char* Arguments::build_resource_string(char** args, int count) {
834 if (args == NULL || count == 0) {
835 return NULL;
836 }
837 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
838 for (int i = 1; i < count; i++) {
839 length += strlen(args[i]) + 1; // add 1 for a space
840 }
841 char* s = NEW_RESOURCE_ARRAY(char, length);
842 strcpy(s, args[0]);
843 for (int j = 1; j < count; j++) {
844 strcat(s, " ");
845 strcat(s, args[j]);
846 }
847 return (const char*) s;
848 }
849
850 void Arguments::print_on(outputStream* st) {
851 st->print_cr("VM Arguments:");
852 if (num_jvm_flags() > 0) {
853 st->print("jvm_flags: "); print_jvm_flags_on(st);
854 }
855 if (num_jvm_args() > 0) {
856 st->print("jvm_args: "); print_jvm_args_on(st);
857 }
858 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
859 if (_java_class_path != NULL) {
860 char* path = _java_class_path->value();
861 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
862 }
863 st->print_cr("Launcher Type: %s", _sun_java_launcher);
864 }
865
866 void Arguments::print_jvm_flags_on(outputStream* st) {
867 if (_num_jvm_flags > 0) {
868 for (int i=0; i < _num_jvm_flags; i++) {
869 st->print("%s ", _jvm_flags_array[i]);
870 }
871 st->cr();
872 }
873 }
874
875 void Arguments::print_jvm_args_on(outputStream* st) {
876 if (_num_jvm_args > 0) {
877 for (int i=0; i < _num_jvm_args; i++) {
878 st->print("%s ", _jvm_args_array[i]);
879 }
880 st->cr();
881 }
882 }
883
884 bool Arguments::process_argument(const char* arg,
885 jboolean ignore_unrecognized, Flag::Flags origin) {
886
887 JDK_Version since = JDK_Version();
888
889 if (parse_argument(arg, origin) || ignore_unrecognized) {
890 return true;
891 }
892
893 bool has_plus_minus = (*arg == '+' || *arg == '-');
894 const char* const argname = has_plus_minus ? arg + 1 : arg;
895 if (is_newly_obsolete(arg, &since)) {
896 char version[256];
897 since.to_string(version, sizeof(version));
898 warning("ignoring option %s; support was removed in %s", argname, version);
899 return true;
900 }
901
902 // For locked flags, report a custom error message if available.
903 // Otherwise, report the standard unrecognized VM option.
904
905 size_t arg_len;
906 const char* equal_sign = strchr(argname, '=');
907 if (equal_sign == NULL) {
908 arg_len = strlen(argname);
909 } else {
910 arg_len = equal_sign - argname;
911 }
912
913 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
914 if (found_flag != NULL) {
915 char locked_message_buf[BUFLEN];
916 found_flag->get_locked_message(locked_message_buf, BUFLEN);
917 if (strlen(locked_message_buf) == 0) {
918 if (found_flag->is_bool() && !has_plus_minus) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Missing +/- setting for VM option '%s'\n", argname);
921 } else if (!found_flag->is_bool() && has_plus_minus) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Unexpected +/- setting in VM option '%s'\n", argname);
924 } else {
925 jio_fprintf(defaultStream::error_stream(),
926 "Improperly specified VM option '%s'\n", argname);
927 }
928 } else {
929 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
930 }
931 } else {
932 jio_fprintf(defaultStream::error_stream(),
933 "Unrecognized VM option '%s'\n", argname);
934 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
935 if (fuzzy_matched != NULL) {
936 jio_fprintf(defaultStream::error_stream(),
937 "Did you mean '%s%s%s'?\n",
938 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
939 fuzzy_matched->_name,
940 (fuzzy_matched->is_bool()) ? "" : "=<value>");
941 }
942 }
943
944 // allow for commandline "commenting out" options like -XX:#+Verbose
945 return arg[0] == '#';
946 }
947
948 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
949 FILE* stream = fopen(file_name, "rb");
950 if (stream == NULL) {
951 if (should_exist) {
952 jio_fprintf(defaultStream::error_stream(),
953 "Could not open settings file %s\n", file_name);
954 return false;
955 } else {
956 return true;
957 }
958 }
959
960 char token[1024];
961 int pos = 0;
962
963 bool in_white_space = true;
964 bool in_comment = false;
965 bool in_quote = false;
966 char quote_c = 0;
967 bool result = true;
968
969 int c = getc(stream);
970 while(c != EOF && pos < (int)(sizeof(token)-1)) {
971 if (in_white_space) {
972 if (in_comment) {
973 if (c == '\n') in_comment = false;
974 } else {
975 if (c == '#') in_comment = true;
976 else if (!isspace(c)) {
977 in_white_space = false;
978 token[pos++] = c;
979 }
980 }
981 } else {
982 if (c == '\n' || (!in_quote && isspace(c))) {
983 // token ends at newline, or at unquoted whitespace
984 // this allows a way to include spaces in string-valued options
985 token[pos] = '\0';
986 logOption(token);
987 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
988 build_jvm_flags(token);
989 pos = 0;
990 in_white_space = true;
991 in_quote = false;
992 } else if (!in_quote && (c == '\'' || c == '"')) {
993 in_quote = true;
994 quote_c = c;
995 } else if (in_quote && (c == quote_c)) {
996 in_quote = false;
997 } else {
998 token[pos++] = c;
999 }
1000 }
1001 c = getc(stream);
1002 }
1003 if (pos > 0) {
1004 token[pos] = '\0';
1005 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1006 build_jvm_flags(token);
1007 }
1008 fclose(stream);
1009 return result;
1010 }
1011
1012 //=============================================================================================================
1013 // Parsing of properties (-D)
1014
1015 const char* Arguments::get_property(const char* key) {
1016 return PropertyList_get_value(system_properties(), key);
1017 }
1018
1019 bool Arguments::add_property(const char* prop) {
1020 const char* eq = strchr(prop, '=');
1021 char* key;
1022 // ns must be static--its address may be stored in a SystemProperty object.
1023 const static char ns[1] = {0};
1024 char* value = (char *)ns;
1025
1026 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1027 key = AllocateHeap(key_len + 1, mtInternal);
1028 strncpy(key, prop, key_len);
1029 key[key_len] = '\0';
1030
1031 if (eq != NULL) {
1032 size_t value_len = strlen(prop) - key_len - 1;
1033 value = AllocateHeap(value_len + 1, mtInternal);
1034 strncpy(value, &prop[key_len + 1], value_len + 1);
1035 }
1036
1037 if (strcmp(key, "java.compiler") == 0) {
1038 process_java_compiler_argument(value);
1039 FreeHeap(key);
1040 if (eq != NULL) {
1041 FreeHeap(value);
1042 }
1043 return true;
1044 } else if (strcmp(key, "sun.java.command") == 0) {
1045 _java_command = value;
1046
1047 // Record value in Arguments, but let it get passed to Java.
1048 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1049 strcmp(key, "sun.java.launcher.pid") == 0) {
1050 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1051 // private and are processed in process_sun_java_launcher_properties();
1052 // the sun.java.launcher property is passed on to the java application
1053 FreeHeap(key);
1054 if (eq != NULL) {
1055 FreeHeap(value);
1056 }
1057 return true;
1058 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1059 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1060 // its value without going through the property list or making a Java call.
1061 _java_vendor_url_bug = value;
1062 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1063 PropertyList_unique_add(&_system_properties, key, value, true);
1064 return true;
1065 }
1066 // Create new property and add at the end of the list
1067 PropertyList_unique_add(&_system_properties, key, value);
1068 return true;
1069 }
1070
1071 //===========================================================================================================
1072 // Setting int/mixed/comp mode flags
1073
1074 void Arguments::set_mode_flags(Mode mode) {
1075 // Set up default values for all flags.
1076 // If you add a flag to any of the branches below,
1077 // add a default value for it here.
1078 set_java_compiler(false);
1079 _mode = mode;
1080
1081 // Ensure Agent_OnLoad has the correct initial values.
1082 // This may not be the final mode; mode may change later in onload phase.
1083 PropertyList_unique_add(&_system_properties, "java.vm.info",
1084 (char*)VM_Version::vm_info_string(), false);
1085
1086 UseInterpreter = true;
1087 UseCompiler = true;
1088 UseLoopCounter = true;
1089
1090 // Default values may be platform/compiler dependent -
1091 // use the saved values
1092 ClipInlining = Arguments::_ClipInlining;
1093 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1094 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1095 BackgroundCompilation = Arguments::_BackgroundCompilation;
1096
1097 // Change from defaults based on mode
1098 switch (mode) {
1099 default:
1100 ShouldNotReachHere();
1101 break;
1102 case _int:
1103 UseCompiler = false;
1104 UseLoopCounter = false;
1105 AlwaysCompileLoopMethods = false;
1106 UseOnStackReplacement = false;
1107 break;
1108 case _mixed:
1109 // same as default
1110 break;
1111 case _comp:
1112 UseInterpreter = false;
1113 BackgroundCompilation = false;
1114 ClipInlining = false;
1115 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1116 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1117 // compile a level 4 (C2) and then continue executing it.
1118 if (TieredCompilation) {
1119 Tier3InvokeNotifyFreqLog = 0;
1120 Tier4InvocationThreshold = 0;
1121 }
1122 break;
1123 }
1124 }
1125
1126 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1127 // Conflict: required to use shared spaces (-Xshare:on), but
1128 // incompatible command line options were chosen.
1129
1130 static void no_shared_spaces(const char* message) {
1131 if (RequireSharedSpaces) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Class data sharing is inconsistent with other specified options.\n");
1134 vm_exit_during_initialization("Unable to use shared archive.", message);
1135 } else {
1136 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1137 }
1138 }
1139 #endif
1140
1141 void Arguments::set_tiered_flags() {
1142 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1143 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1144 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1145 }
1146 if (CompilationPolicyChoice < 2) {
1147 vm_exit_during_initialization(
1148 "Incompatible compilation policy selected", NULL);
1149 }
1150 // Increase the code cache size - tiered compiles a lot more.
1151 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1152 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1153 }
1154 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1155 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1156 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1157
1158 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1159 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1160 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1161 }
1162 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1163 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1164 }
1165 // Check consistency of code heap sizes
1166 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1169 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1170 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1171 vm_exit(1);
1172 }
1173 }
1174 if (!UseInterpreter) { // -Xcomp
1175 Tier3InvokeNotifyFreqLog = 0;
1176 Tier4InvocationThreshold = 0;
1177 }
1178 }
1179
1180 /**
1181 * Returns the minimum number of compiler threads needed to run the JVM. The following
1182 * configurations are possible.
1183 *
1184 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1185 * compiler threads is 0.
1186 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1187 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1188 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1189 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1190 * C1 can be used, so the minimum number of compiler threads is 1.
1191 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1192 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1193 * the minimum number of compiler threads is 2.
1194 */
1195 int Arguments::get_min_number_of_compiler_threads() {
1196 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1197 return 0; // case 1
1198 #else
1199 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1200 return 1; // case 2 or case 3
1201 }
1202 return 2; // case 4 (tiered)
1203 #endif
1204 }
1205
1206 #if INCLUDE_ALL_GCS
1207 static void disable_adaptive_size_policy(const char* collector_name) {
1208 if (UseAdaptiveSizePolicy) {
1209 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1210 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1211 collector_name);
1212 }
1213 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1214 }
1215 }
1216
1217 void Arguments::set_parnew_gc_flags() {
1218 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1219 "control point invariant");
1220 assert(UseParNewGC, "Error");
1221
1222 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1223 disable_adaptive_size_policy("UseParNewGC");
1224
1225 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1226 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1227 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1228 } else if (ParallelGCThreads == 0) {
1229 jio_fprintf(defaultStream::error_stream(),
1230 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1231 vm_exit(1);
1232 }
1233
1234 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1235 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1236 // we set them to 1024 and 1024.
1237 // See CR 6362902.
1238 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1239 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1240 }
1241 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1242 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1243 }
1244
1245 // When using compressed oops, we use local overflow stacks,
1246 // rather than using a global overflow list chained through
1247 // the klass word of the object's pre-image.
1248 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1249 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1250 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1251 }
1252 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1253 }
1254 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1255 }
1256
1257 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1258 // sparc/solaris for certain applications, but would gain from
1259 // further optimization and tuning efforts, and would almost
1260 // certainly gain from analysis of platform and environment.
1261 void Arguments::set_cms_and_parnew_gc_flags() {
1262 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1263 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1264
1265 // If we are using CMS, we prefer to UseParNewGC,
1266 // unless explicitly forbidden.
1267 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1268 FLAG_SET_ERGO(bool, UseParNewGC, true);
1269 }
1270
1271 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1272 disable_adaptive_size_policy("UseConcMarkSweepGC");
1273
1274 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1275 // as needed.
1276 if (UseParNewGC) {
1277 set_parnew_gc_flags();
1278 }
1279
1280 size_t max_heap = align_size_down(MaxHeapSize,
1281 CardTableRS::ct_max_alignment_constraint());
1282
1283 // Now make adjustments for CMS
1284 intx tenuring_default = (intx)6;
1285 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1286
1287 // Preferred young gen size for "short" pauses:
1288 // upper bound depends on # of threads and NewRatio.
1289 const uintx parallel_gc_threads =
1290 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1291 const size_t preferred_max_new_size_unaligned =
1292 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1293 size_t preferred_max_new_size =
1294 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1295
1296 // Unless explicitly requested otherwise, size young gen
1297 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1298
1299 // If either MaxNewSize or NewRatio is set on the command line,
1300 // assume the user is trying to set the size of the young gen.
1301 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1302
1303 // Set MaxNewSize to our calculated preferred_max_new_size unless
1304 // NewSize was set on the command line and it is larger than
1305 // preferred_max_new_size.
1306 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1307 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1308 } else {
1309 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1310 }
1311 if (PrintGCDetails && Verbose) {
1312 // Too early to use gclog_or_tty
1313 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1314 }
1315
1316 // Code along this path potentially sets NewSize and OldSize
1317 if (PrintGCDetails && Verbose) {
1318 // Too early to use gclog_or_tty
1319 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1320 " initial_heap_size: " SIZE_FORMAT
1321 " max_heap: " SIZE_FORMAT,
1322 min_heap_size(), InitialHeapSize, max_heap);
1323 }
1324 size_t min_new = preferred_max_new_size;
1325 if (FLAG_IS_CMDLINE(NewSize)) {
1326 min_new = NewSize;
1327 }
1328 if (max_heap > min_new && min_heap_size() > min_new) {
1329 // Unless explicitly requested otherwise, make young gen
1330 // at least min_new, and at most preferred_max_new_size.
1331 if (FLAG_IS_DEFAULT(NewSize)) {
1332 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1333 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1334 if (PrintGCDetails && Verbose) {
1335 // Too early to use gclog_or_tty
1336 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1337 }
1338 }
1339 // Unless explicitly requested otherwise, size old gen
1340 // so it's NewRatio x of NewSize.
1341 if (FLAG_IS_DEFAULT(OldSize)) {
1342 if (max_heap > NewSize) {
1343 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1344 if (PrintGCDetails && Verbose) {
1345 // Too early to use gclog_or_tty
1346 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1347 }
1348 }
1349 }
1350 }
1351 }
1352 // Unless explicitly requested otherwise, definitely
1353 // promote all objects surviving "tenuring_default" scavenges.
1354 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1355 FLAG_IS_DEFAULT(SurvivorRatio)) {
1356 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1357 }
1358 // If we decided above (or user explicitly requested)
1359 // `promote all' (via MaxTenuringThreshold := 0),
1360 // prefer minuscule survivor spaces so as not to waste
1361 // space for (non-existent) survivors
1362 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1363 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1364 }
1365 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1366 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1367 // This is done in order to make ParNew+CMS configuration to work
1368 // with YoungPLABSize and OldPLABSize options.
1369 // See CR 6362902.
1370 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1371 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1372 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1373 // is. In this situation let CMSParPromoteBlocksToClaim follow
1374 // the value (either from the command line or ergonomics) of
1375 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1376 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1377 } else {
1378 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1379 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1380 // we'll let it to take precedence.
1381 jio_fprintf(defaultStream::error_stream(),
1382 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1383 " options are specified for the CMS collector."
1384 " CMSParPromoteBlocksToClaim will take precedence.\n");
1385 }
1386 }
1387 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1388 // OldPLAB sizing manually turned off: Use a larger default setting,
1389 // unless it was manually specified. This is because a too-low value
1390 // will slow down scavenges.
1391 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1392 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1393 }
1394 }
1395 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1396 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1397 // If either of the static initialization defaults have changed, note this
1398 // modification.
1399 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1400 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1401 }
1402 if (PrintGCDetails && Verbose) {
1403 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1404 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1405 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1406 }
1407 }
1408 #endif // INCLUDE_ALL_GCS
1409
1410 void set_object_alignment() {
1411 // Object alignment.
1412 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1413 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1414 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1415 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1416 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1417 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1418
1419 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1420 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1421
1422 // Oop encoding heap max
1423 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1424
1425 #if INCLUDE_ALL_GCS
1426 // Set CMS global values
1427 CompactibleFreeListSpace::set_cms_values();
1428 #endif // INCLUDE_ALL_GCS
1429 }
1430
1431 bool verify_object_alignment() {
1432 // Object alignment.
1433 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1434 jio_fprintf(defaultStream::error_stream(),
1435 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1436 (int)ObjectAlignmentInBytes);
1437 return false;
1438 }
1439 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1440 jio_fprintf(defaultStream::error_stream(),
1441 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1442 (int)ObjectAlignmentInBytes, BytesPerLong);
1443 return false;
1444 }
1445 // It does not make sense to have big object alignment
1446 // since a space lost due to alignment will be greater
1447 // then a saved space from compressed oops.
1448 if ((int)ObjectAlignmentInBytes > 256) {
1449 jio_fprintf(defaultStream::error_stream(),
1450 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1451 (int)ObjectAlignmentInBytes);
1452 return false;
1453 }
1454 // In case page size is very small.
1455 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1456 jio_fprintf(defaultStream::error_stream(),
1457 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1458 (int)ObjectAlignmentInBytes, os::vm_page_size());
1459 return false;
1460 }
1461 if(SurvivorAlignmentInBytes == 0) {
1462 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1463 } else {
1464 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1465 jio_fprintf(defaultStream::error_stream(),
1466 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1467 (int)SurvivorAlignmentInBytes);
1468 return false;
1469 }
1470 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1471 jio_fprintf(defaultStream::error_stream(),
1472 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1473 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1474 return false;
1475 }
1476 }
1477 return true;
1478 }
1479
1480 size_t Arguments::max_heap_for_compressed_oops() {
1481 // Avoid sign flip.
1482 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1483 // We need to fit both the NULL page and the heap into the memory budget, while
1484 // keeping alignment constraints of the heap. To guarantee the latter, as the
1485 // NULL page is located before the heap, we pad the NULL page to the conservative
1486 // maximum alignment that the GC may ever impose upon the heap.
1487 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1488 _conservative_max_heap_alignment);
1489
1490 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1491 NOT_LP64(ShouldNotReachHere(); return 0);
1492 }
1493
1494 bool Arguments::should_auto_select_low_pause_collector() {
1495 if (UseAutoGCSelectPolicy &&
1496 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1497 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1498 if (PrintGCDetails) {
1499 // Cannot use gclog_or_tty yet.
1500 tty->print_cr("Automatic selection of the low pause collector"
1501 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1502 }
1503 return true;
1504 }
1505 return false;
1506 }
1507
1508 void Arguments::set_use_compressed_oops() {
1509 #ifndef ZERO
1510 #ifdef _LP64
1511 // MaxHeapSize is not set up properly at this point, but
1512 // the only value that can override MaxHeapSize if we are
1513 // to use UseCompressedOops is InitialHeapSize.
1514 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1515
1516 if (max_heap_size <= max_heap_for_compressed_oops()) {
1517 #if !defined(COMPILER1) || defined(TIERED)
1518 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1519 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1520 }
1521 #endif
1522 #ifdef _WIN64
1523 if (UseLargePages && UseCompressedOops) {
1524 // Cannot allocate guard pages for implicit checks in indexed addressing
1525 // mode, when large pages are specified on windows.
1526 // This flag could be switched ON if narrow oop base address is set to 0,
1527 // see code in Universe::initialize_heap().
1528 Universe::set_narrow_oop_use_implicit_null_checks(false);
1529 }
1530 #endif // _WIN64
1531 } else {
1532 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1533 warning("Max heap size too large for Compressed Oops");
1534 FLAG_SET_DEFAULT(UseCompressedOops, false);
1535 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1536 }
1537 }
1538 #endif // _LP64
1539 #endif // ZERO
1540 }
1541
1542
1543 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1544 // set_use_compressed_oops().
1545 void Arguments::set_use_compressed_klass_ptrs() {
1546 #ifndef ZERO
1547 #ifdef _LP64
1548 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1549 if (!UseCompressedOops) {
1550 if (UseCompressedClassPointers) {
1551 warning("UseCompressedClassPointers requires UseCompressedOops");
1552 }
1553 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1554 } else {
1555 // Turn on UseCompressedClassPointers too
1556 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1557 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1558 }
1559 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1560 if (UseCompressedClassPointers) {
1561 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1562 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1563 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1564 }
1565 }
1566 }
1567 #endif // _LP64
1568 #endif // !ZERO
1569 }
1570
1571 void Arguments::set_conservative_max_heap_alignment() {
1572 // The conservative maximum required alignment for the heap is the maximum of
1573 // the alignments imposed by several sources: any requirements from the heap
1574 // itself, the collector policy and the maximum page size we may run the VM
1575 // with.
1576 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1577 #if INCLUDE_ALL_GCS
1578 if (UseParallelGC) {
1579 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1580 } else if (UseG1GC) {
1581 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1582 }
1583 #endif // INCLUDE_ALL_GCS
1584 _conservative_max_heap_alignment = MAX4(heap_alignment,
1585 (size_t)os::vm_allocation_granularity(),
1586 os::max_page_size(),
1587 CollectorPolicy::compute_heap_alignment());
1588 }
1589
1590 void Arguments::select_gc_ergonomically() {
1591 if (os::is_server_class_machine()) {
1592 if (should_auto_select_low_pause_collector()) {
1593 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1594 } else {
1595 FLAG_SET_ERGO(bool, UseParallelGC, true);
1596 }
1597 }
1598 }
1599
1600 void Arguments::select_gc() {
1601 if (!gc_selected()) {
1602 ArgumentsExt::select_gc_ergonomically();
1603 }
1604 }
1605
1606 void Arguments::set_ergonomics_flags() {
1607 select_gc();
1608
1609 #ifdef COMPILER2
1610 // Shared spaces work fine with other GCs but causes bytecode rewriting
1611 // to be disabled, which hurts interpreter performance and decreases
1612 // server performance. When -server is specified, keep the default off
1613 // unless it is asked for. Future work: either add bytecode rewriting
1614 // at link time, or rewrite bytecodes in non-shared methods.
1615 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1616 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1617 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1618 }
1619 #endif
1620
1621 set_conservative_max_heap_alignment();
1622
1623 #ifndef ZERO
1624 #ifdef _LP64
1625 set_use_compressed_oops();
1626
1627 // set_use_compressed_klass_ptrs() must be called after calling
1628 // set_use_compressed_oops().
1629 set_use_compressed_klass_ptrs();
1630
1631 // Also checks that certain machines are slower with compressed oops
1632 // in vm_version initialization code.
1633 #endif // _LP64
1634 #endif // !ZERO
1635 }
1636
1637 void Arguments::set_parallel_gc_flags() {
1638 assert(UseParallelGC || UseParallelOldGC, "Error");
1639 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1640 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1641 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1642 }
1643 FLAG_SET_DEFAULT(UseParallelGC, true);
1644
1645 // If no heap maximum was requested explicitly, use some reasonable fraction
1646 // of the physical memory, up to a maximum of 1GB.
1647 FLAG_SET_DEFAULT(ParallelGCThreads,
1648 Abstract_VM_Version::parallel_worker_threads());
1649 if (ParallelGCThreads == 0) {
1650 jio_fprintf(defaultStream::error_stream(),
1651 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1652 vm_exit(1);
1653 }
1654
1655 if (UseAdaptiveSizePolicy) {
1656 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1657 // unless the user actually sets these flags.
1658 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1659 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1660 _min_heap_free_ratio = MinHeapFreeRatio;
1661 }
1662 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1663 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1664 _max_heap_free_ratio = MaxHeapFreeRatio;
1665 }
1666 }
1667
1668 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1669 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1670 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1671 // See CR 6362902 for details.
1672 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1673 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1674 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1675 }
1676 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1677 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1678 }
1679 }
1680
1681 if (UseParallelOldGC) {
1682 // Par compact uses lower default values since they are treated as
1683 // minimums. These are different defaults because of the different
1684 // interpretation and are not ergonomically set.
1685 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1686 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1687 }
1688 }
1689 }
1690
1691 void Arguments::set_g1_gc_flags() {
1692 assert(UseG1GC, "Error");
1693 #ifdef COMPILER1
1694 FastTLABRefill = false;
1695 #endif
1696 FLAG_SET_DEFAULT(ParallelGCThreads,
1697 Abstract_VM_Version::parallel_worker_threads());
1698 if (ParallelGCThreads == 0) {
1699 FLAG_SET_DEFAULT(ParallelGCThreads,
1700 Abstract_VM_Version::parallel_worker_threads());
1701 }
1702
1703 // MarkStackSize will be set (if it hasn't been set by the user)
1704 // when concurrent marking is initialized.
1705 // Its value will be based upon the number of parallel marking threads.
1706 // But we do set the maximum mark stack size here.
1707 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1708 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1709 }
1710
1711 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1712 // In G1, we want the default GC overhead goal to be higher than
1713 // say in PS. So we set it here to 10%. Otherwise the heap might
1714 // be expanded more aggressively than we would like it to. In
1715 // fact, even 10% seems to not be high enough in some cases
1716 // (especially small GC stress tests that the main thing they do
1717 // is allocation). We might consider increase it further.
1718 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1719 }
1720
1721 if (PrintGCDetails && Verbose) {
1722 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1723 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1724 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1725 }
1726 }
1727
1728 #if !INCLUDE_ALL_GCS
1729 #ifdef ASSERT
1730 static bool verify_serial_gc_flags() {
1731 return (UseSerialGC &&
1732 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1733 UseParallelGC || UseParallelOldGC));
1734 }
1735 #endif // ASSERT
1736 #endif // INCLUDE_ALL_GCS
1737
1738 void Arguments::set_gc_specific_flags() {
1739 #if INCLUDE_ALL_GCS
1740 // Set per-collector flags
1741 if (UseParallelGC || UseParallelOldGC) {
1742 set_parallel_gc_flags();
1743 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1744 set_cms_and_parnew_gc_flags();
1745 } else if (UseParNewGC) { // Skipped if CMS is set above
1746 set_parnew_gc_flags();
1747 } else if (UseG1GC) {
1748 set_g1_gc_flags();
1749 }
1750 check_deprecated_gcs();
1751 check_deprecated_gc_flags();
1752 if (AssumeMP && !UseSerialGC) {
1753 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1754 warning("If the number of processors is expected to increase from one, then"
1755 " you should configure the number of parallel GC threads appropriately"
1756 " using -XX:ParallelGCThreads=N");
1757 }
1758 }
1759 if (MinHeapFreeRatio == 100) {
1760 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1761 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1762 }
1763 #else // INCLUDE_ALL_GCS
1764 assert(verify_serial_gc_flags(), "SerialGC unset");
1765 #endif // INCLUDE_ALL_GCS
1766 }
1767
1768 julong Arguments::limit_by_allocatable_memory(julong limit) {
1769 julong max_allocatable;
1770 julong result = limit;
1771 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1772 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1773 }
1774 return result;
1775 }
1776
1777 // Use static initialization to get the default before parsing
1778 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1779
1780 void Arguments::set_heap_size() {
1781 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1782 // Deprecated flag
1783 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1784 }
1785
1786 const julong phys_mem =
1787 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1788 : (julong)MaxRAM;
1789
1790 // If the maximum heap size has not been set with -Xmx,
1791 // then set it as fraction of the size of physical memory,
1792 // respecting the maximum and minimum sizes of the heap.
1793 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1794 julong reasonable_max = phys_mem / MaxRAMFraction;
1795
1796 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1797 // Small physical memory, so use a minimum fraction of it for the heap
1798 reasonable_max = phys_mem / MinRAMFraction;
1799 } else {
1800 // Not-small physical memory, so require a heap at least
1801 // as large as MaxHeapSize
1802 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1803 }
1804 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1805 // Limit the heap size to ErgoHeapSizeLimit
1806 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1807 }
1808 if (UseCompressedOops) {
1809 // Limit the heap size to the maximum possible when using compressed oops
1810 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1811
1812 // HeapBaseMinAddress can be greater than default but not less than.
1813 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1814 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1815 // matches compressed oops printing flags
1816 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1817 jio_fprintf(defaultStream::error_stream(),
1818 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1819 " (" UINTX_FORMAT "G) which is greater than value given "
1820 UINTX_FORMAT "\n",
1821 DefaultHeapBaseMinAddress,
1822 DefaultHeapBaseMinAddress/G,
1823 HeapBaseMinAddress);
1824 }
1825 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1826 }
1827 }
1828
1829 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1830 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1831 // but it should be not less than default MaxHeapSize.
1832 max_coop_heap -= HeapBaseMinAddress;
1833 }
1834 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1835 }
1836 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1837
1838 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1839 // An initial heap size was specified on the command line,
1840 // so be sure that the maximum size is consistent. Done
1841 // after call to limit_by_allocatable_memory because that
1842 // method might reduce the allocation size.
1843 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1844 }
1845
1846 if (PrintGCDetails && Verbose) {
1847 // Cannot use gclog_or_tty yet.
1848 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1849 }
1850 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1851 }
1852
1853 // If the minimum or initial heap_size have not been set or requested to be set
1854 // ergonomically, set them accordingly.
1855 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1856 julong reasonable_minimum = (julong)(OldSize + NewSize);
1857
1858 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1859
1860 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1861
1862 if (InitialHeapSize == 0) {
1863 julong reasonable_initial = phys_mem / InitialRAMFraction;
1864
1865 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1866 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1867
1868 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1869
1870 if (PrintGCDetails && Verbose) {
1871 // Cannot use gclog_or_tty yet.
1872 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1873 }
1874 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1875 }
1876 // If the minimum heap size has not been set (via -Xms),
1877 // synchronize with InitialHeapSize to avoid errors with the default value.
1878 if (min_heap_size() == 0) {
1879 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1880 if (PrintGCDetails && Verbose) {
1881 // Cannot use gclog_or_tty yet.
1882 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1883 }
1884 }
1885 }
1886 }
1887
1888 // This must be called after ergonomics because we want bytecode rewriting
1889 // if the server compiler is used, or if UseSharedSpaces is disabled.
1890 void Arguments::set_bytecode_flags() {
1891 // Better not attempt to store into a read-only space.
1892 if (UseSharedSpaces) {
1893 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1894 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1895 }
1896
1897 if (!RewriteBytecodes) {
1898 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1899 }
1900 }
1901
1902 // Aggressive optimization flags -XX:+AggressiveOpts
1903 void Arguments::set_aggressive_opts_flags() {
1904 #ifdef COMPILER2
1905 if (AggressiveUnboxing) {
1906 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1907 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1908 } else if (!EliminateAutoBox) {
1909 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1910 AggressiveUnboxing = false;
1911 }
1912 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1913 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1914 } else if (!DoEscapeAnalysis) {
1915 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1916 AggressiveUnboxing = false;
1917 }
1918 }
1919 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1920 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1921 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1922 }
1923 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1924 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1925 }
1926
1927 // Feed the cache size setting into the JDK
1928 char buffer[1024];
1929 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1930 add_property(buffer);
1931 }
1932 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1933 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1934 }
1935 #endif
1936
1937 if (AggressiveOpts) {
1938 // Sample flag setting code
1939 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1940 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1941 // }
1942 }
1943 }
1944
1945 //===========================================================================================================
1946 // Parsing of java.compiler property
1947
1948 void Arguments::process_java_compiler_argument(char* arg) {
1949 // For backwards compatibility, Djava.compiler=NONE or ""
1950 // causes us to switch to -Xint mode UNLESS -Xdebug
1951 // is also specified.
1952 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1953 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1954 }
1955 }
1956
1957 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1958 _sun_java_launcher = os::strdup_check_oom(launcher);
1959 }
1960
1961 bool Arguments::created_by_java_launcher() {
1962 assert(_sun_java_launcher != NULL, "property must have value");
1963 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1964 }
1965
1966 bool Arguments::sun_java_launcher_is_altjvm() {
1967 return _sun_java_launcher_is_altjvm;
1968 }
1969
1970 //===========================================================================================================
1971 // Parsing of main arguments
1972
1973 bool Arguments::verify_interval(uintx val, uintx min,
1974 uintx max, const char* name) {
1975 // Returns true iff value is in the inclusive interval [min..max]
1976 // false, otherwise.
1977 if (val >= min && val <= max) {
1978 return true;
1979 }
1980 jio_fprintf(defaultStream::error_stream(),
1981 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1982 " and " UINTX_FORMAT "\n",
1983 name, val, min, max);
1984 return false;
1985 }
1986
1987 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1988 // Returns true if given value is at least specified min threshold
1989 // false, otherwise.
1990 if (val >= min ) {
1991 return true;
1992 }
1993 jio_fprintf(defaultStream::error_stream(),
1994 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1995 name, val, min);
1996 return false;
1997 }
1998
1999 bool Arguments::verify_percentage(uintx value, const char* name) {
2000 if (is_percentage(value)) {
2001 return true;
2002 }
2003 jio_fprintf(defaultStream::error_stream(),
2004 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2005 name, value);
2006 return false;
2007 }
2008
2009 // check if do gclog rotation
2010 // +UseGCLogFileRotation is a must,
2011 // no gc log rotation when log file not supplied or
2012 // NumberOfGCLogFiles is 0
2013 void check_gclog_consistency() {
2014 if (UseGCLogFileRotation) {
2015 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2016 jio_fprintf(defaultStream::output_stream(),
2017 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2018 "where num_of_file > 0\n"
2019 "GC log rotation is turned off\n");
2020 UseGCLogFileRotation = false;
2021 }
2022 }
2023
2024 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2025 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2026 jio_fprintf(defaultStream::output_stream(),
2027 "GCLogFileSize changed to minimum 8K\n");
2028 }
2029 }
2030
2031 // This function is called for -Xloggc:<filename>, it can be used
2032 // to check if a given file name(or string) conforms to the following
2033 // specification:
2034 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2035 // %p and %t only allowed once. We only limit usage of filename not path
2036 bool is_filename_valid(const char *file_name) {
2037 const char* p = file_name;
2038 char file_sep = os::file_separator()[0];
2039 const char* cp;
2040 // skip prefix path
2041 for (cp = file_name; *cp != '\0'; cp++) {
2042 if (*cp == '/' || *cp == file_sep) {
2043 p = cp + 1;
2044 }
2045 }
2046
2047 int count_p = 0;
2048 int count_t = 0;
2049 while (*p != '\0') {
2050 if ((*p >= '0' && *p <= '9') ||
2051 (*p >= 'A' && *p <= 'Z') ||
2052 (*p >= 'a' && *p <= 'z') ||
2053 *p == '-' ||
2054 *p == '_' ||
2055 *p == '.') {
2056 p++;
2057 continue;
2058 }
2059 if (*p == '%') {
2060 if(*(p + 1) == 'p') {
2061 p += 2;
2062 count_p ++;
2063 continue;
2064 }
2065 if (*(p + 1) == 't') {
2066 p += 2;
2067 count_t ++;
2068 continue;
2069 }
2070 }
2071 return false;
2072 }
2073 return count_p < 2 && count_t < 2;
2074 }
2075
2076 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2077 if (!is_percentage(min_heap_free_ratio)) {
2078 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2079 return false;
2080 }
2081 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2082 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2083 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2084 MaxHeapFreeRatio);
2085 return false;
2086 }
2087 // This does not set the flag itself, but stores the value in a safe place for later usage.
2088 _min_heap_free_ratio = min_heap_free_ratio;
2089 return true;
2090 }
2091
2092 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2093 if (!is_percentage(max_heap_free_ratio)) {
2094 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2095 return false;
2096 }
2097 if (max_heap_free_ratio < MinHeapFreeRatio) {
2098 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2099 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2100 MinHeapFreeRatio);
2101 return false;
2102 }
2103 // This does not set the flag itself, but stores the value in a safe place for later usage.
2104 _max_heap_free_ratio = max_heap_free_ratio;
2105 return true;
2106 }
2107
2108 // Check consistency of GC selection
2109 bool Arguments::check_gc_consistency_user() {
2110 check_gclog_consistency();
2111 bool status = true;
2112 // Ensure that the user has not selected conflicting sets
2113 // of collectors. [Note: this check is merely a user convenience;
2114 // collectors over-ride each other so that only a non-conflicting
2115 // set is selected; however what the user gets is not what they
2116 // may have expected from the combination they asked for. It's
2117 // better to reduce user confusion by not allowing them to
2118 // select conflicting combinations.
2119 uint i = 0;
2120 if (UseSerialGC) i++;
2121 if (UseConcMarkSweepGC || UseParNewGC) i++;
2122 if (UseParallelGC || UseParallelOldGC) i++;
2123 if (UseG1GC) i++;
2124 if (i > 1) {
2125 jio_fprintf(defaultStream::error_stream(),
2126 "Conflicting collector combinations in option list; "
2127 "please refer to the release notes for the combinations "
2128 "allowed\n");
2129 status = false;
2130 }
2131 return status;
2132 }
2133
2134 void Arguments::check_deprecated_gcs() {
2135 if (UseConcMarkSweepGC && !UseParNewGC) {
2136 warning("Using the DefNew young collector with the CMS collector is deprecated "
2137 "and will likely be removed in a future release");
2138 }
2139
2140 if (UseParNewGC && !UseConcMarkSweepGC) {
2141 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2142 // set up UseSerialGC properly, so that can't be used in the check here.
2143 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2144 "and will likely be removed in a future release");
2145 }
2146
2147 if (CMSIncrementalMode) {
2148 warning("Using incremental CMS is deprecated 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 if (CMSIncrementalMode) {
2272 if (!UseConcMarkSweepGC) {
2273 jio_fprintf(defaultStream::error_stream(),
2274 "error: invalid argument combination.\n"
2275 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2276 "selected in order\nto use CMSIncrementalMode.\n");
2277 status = false;
2278 } else {
2279 status = status && verify_percentage(CMSIncrementalDutyCycle,
2280 "CMSIncrementalDutyCycle");
2281 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2282 "CMSIncrementalDutyCycleMin");
2283 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2284 "CMSIncrementalSafetyFactor");
2285 status = status && verify_percentage(CMSIncrementalOffset,
2286 "CMSIncrementalOffset");
2287 status = status && verify_percentage(CMSExpAvgFactor,
2288 "CMSExpAvgFactor");
2289 // If it was not set on the command line, set
2290 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2291 if (CMSInitiatingOccupancyFraction < 0) {
2292 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2293 }
2294 }
2295 }
2296
2297 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2298 // insists that we hold the requisite locks so that the iteration is
2299 // MT-safe. For the verification at start-up and shut-down, we don't
2300 // yet have a good way of acquiring and releasing these locks,
2301 // which are not visible at the CollectedHeap level. We want to
2302 // be able to acquire these locks and then do the iteration rather
2303 // than just disable the lock verification. This will be fixed under
2304 // bug 4788986.
2305 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2306 if (VerifyDuringStartup) {
2307 warning("Heap verification at start-up disabled "
2308 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2309 VerifyDuringStartup = false; // Disable verification at start-up
2310 }
2311
2312 if (VerifyBeforeExit) {
2313 warning("Heap verification at shutdown disabled "
2314 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2315 VerifyBeforeExit = false; // Disable verification at shutdown
2316 }
2317 }
2318
2319 // Note: only executed in non-PRODUCT mode
2320 if (!UseAsyncConcMarkSweepGC &&
2321 (ExplicitGCInvokesConcurrent ||
2322 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2323 jio_fprintf(defaultStream::error_stream(),
2324 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2325 " with -UseAsyncConcMarkSweepGC");
2326 status = false;
2327 }
2328
2329 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2330
2331 #if INCLUDE_ALL_GCS
2332 if (UseG1GC) {
2333 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2334 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2335 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2336
2337 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2338 "InitiatingHeapOccupancyPercent");
2339 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2340 "G1RefProcDrainInterval");
2341 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2342 "G1ConcMarkStepDurationMillis");
2343 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2344 "G1ConcRSHotCardLimit");
2345 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2346 "G1ConcRSLogCacheSize");
2347 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2348 "StringDeduplicationAgeThreshold");
2349 }
2350 if (UseConcMarkSweepGC) {
2351 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2352 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2353 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2354 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2355
2356 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2357
2358 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2359 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2360 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2361
2362 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2363
2364 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2365 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2366
2367 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2368 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2369 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2370
2371 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2372
2373 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2374
2375 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2376 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2377 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2378 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2379 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2380 }
2381
2382 if (UseParallelGC || UseParallelOldGC) {
2383 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2384 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2385
2386 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2387 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2388
2389 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2390 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2391
2392 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2393
2394 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2395 }
2396 #endif // INCLUDE_ALL_GCS
2397
2398 status = status && verify_interval(RefDiscoveryPolicy,
2399 ReferenceProcessor::DiscoveryPolicyMin,
2400 ReferenceProcessor::DiscoveryPolicyMax,
2401 "RefDiscoveryPolicy");
2402
2403 // Limit the lower bound of this flag to 1 as it is used in a division
2404 // expression.
2405 status = status && verify_interval(TLABWasteTargetPercent,
2406 1, 100, "TLABWasteTargetPercent");
2407
2408 status = status && verify_object_alignment();
2409
2410 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2411 "CompressedClassSpaceSize");
2412
2413 status = status && verify_interval(MarkStackSizeMax,
2414 1, (max_jint - 1), "MarkStackSizeMax");
2415 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2416
2417 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2418
2419 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2420
2421 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2422
2423 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2424 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2425
2426 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2427
2428 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2429 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2430 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2431 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2432
2433 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2434 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2435
2436 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2437 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2438 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2439
2440 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2441 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2442
2443 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2444 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2445 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2446 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2447
2448 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2449 #ifdef COMPILER1
2450 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2451 #endif
2452
2453 if (PrintNMTStatistics) {
2454 #if INCLUDE_NMT
2455 if (MemTracker::tracking_level() == NMT_off) {
2456 #endif // INCLUDE_NMT
2457 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2458 PrintNMTStatistics = false;
2459 #if INCLUDE_NMT
2460 }
2461 #endif
2462 }
2463
2464 // Need to limit the extent of the padding to reasonable size.
2465 // 8K is well beyond the reasonable HW cache line size, even with the
2466 // aggressive prefetching, while still leaving the room for segregating
2467 // among the distinct pages.
2468 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2469 jio_fprintf(defaultStream::error_stream(),
2470 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2471 ContendedPaddingWidth, 0, 8192);
2472 status = false;
2473 }
2474
2475 // Need to enforce the padding not to break the existing field alignments.
2476 // It is sufficient to check against the largest type size.
2477 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2480 ContendedPaddingWidth, BytesPerLong);
2481 status = false;
2482 }
2483
2484 // Check lower bounds of the code cache
2485 // Template Interpreter code is approximately 3X larger in debug builds.
2486 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2487 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2490 os::vm_page_size()/K);
2491 status = false;
2492 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2495 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2496 status = false;
2497 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2500 min_code_cache_size/K);
2501 status = false;
2502 } else if (ReservedCodeCacheSize > 2*G) {
2503 // Code cache size larger than MAXINT is not supported.
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2506 (2*G)/M);
2507 status = false;
2508 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2511 min_code_cache_size/K);
2512 status = false;
2513 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2514 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2515 jio_fprintf(defaultStream::error_stream(),
2516 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2517 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2518 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2519 status = false;
2520 }
2521
2522 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2523 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2524 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2525 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2526
2527
2528 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2529 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2530 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2531 // Check the minimum number of compiler threads
2532 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2533
2534 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2535 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2536 }
2537
2538 return status;
2539 }
2540
2541 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2542 const char* option_type) {
2543 if (ignore) return false;
2544
2545 const char* spacer = " ";
2546 if (option_type == NULL) {
2547 option_type = ++spacer; // Set both to the empty string.
2548 }
2549
2550 if (os::obsolete_option(option)) {
2551 jio_fprintf(defaultStream::error_stream(),
2552 "Obsolete %s%soption: %s\n", option_type, spacer,
2553 option->optionString);
2554 return false;
2555 } else {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Unrecognized %s%soption: %s\n", option_type, spacer,
2558 option->optionString);
2559 return true;
2560 }
2561 }
2562
2563 static const char* user_assertion_options[] = {
2564 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2565 };
2566
2567 static const char* system_assertion_options[] = {
2568 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2569 };
2570
2571 // Return true if any of the strings in null-terminated array 'names' matches.
2572 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2573 // the option must match exactly.
2574 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2575 bool tail_allowed) {
2576 for (/* empty */; *names != NULL; ++names) {
2577 if (match_option(option, *names, tail)) {
2578 if (**tail == '\0' || tail_allowed && **tail == ':') {
2579 return true;
2580 }
2581 }
2582 }
2583 return false;
2584 }
2585
2586 bool Arguments::parse_uintx(const char* value,
2587 uintx* uintx_arg,
2588 uintx min_size) {
2589
2590 // Check the sign first since atomull() parses only unsigned values.
2591 bool value_is_positive = !(*value == '-');
2592
2593 if (value_is_positive) {
2594 julong n;
2595 bool good_return = atomull(value, &n);
2596 if (good_return) {
2597 bool above_minimum = n >= min_size;
2598 bool value_is_too_large = n > max_uintx;
2599
2600 if (above_minimum && !value_is_too_large) {
2601 *uintx_arg = n;
2602 return true;
2603 }
2604 }
2605 }
2606 return false;
2607 }
2608
2609 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2610 julong* long_arg,
2611 julong min_size) {
2612 if (!atomull(s, long_arg)) return arg_unreadable;
2613 return check_memory_size(*long_arg, min_size);
2614 }
2615
2616 // Parse JavaVMInitArgs structure
2617
2618 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2619 // For components of the system classpath.
2620 SysClassPath scp(Arguments::get_sysclasspath());
2621 bool scp_assembly_required = false;
2622
2623 // Save default settings for some mode flags
2624 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2625 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2626 Arguments::_ClipInlining = ClipInlining;
2627 Arguments::_BackgroundCompilation = BackgroundCompilation;
2628
2629 // Setup flags for mixed which is the default
2630 set_mode_flags(_mixed);
2631
2632 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2633 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2634 if (result != JNI_OK) {
2635 return result;
2636 }
2637
2638 // Parse JavaVMInitArgs structure passed in
2639 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2640 if (result != JNI_OK) {
2641 return result;
2642 }
2643
2644 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2645 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2646 if (result != JNI_OK) {
2647 return result;
2648 }
2649
2650 // Do final processing now that all arguments have been parsed
2651 result = finalize_vm_init_args(&scp, scp_assembly_required);
2652 if (result != JNI_OK) {
2653 return result;
2654 }
2655
2656 return JNI_OK;
2657 }
2658
2659 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2660 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2661 // are dealing with -agentpath (case where name is a path), otherwise with
2662 // -agentlib
2663 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2664 char *_name;
2665 const char *_hprof = "hprof", *_jdwp = "jdwp";
2666 size_t _len_hprof, _len_jdwp, _len_prefix;
2667
2668 if (is_path) {
2669 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2670 return false;
2671 }
2672
2673 _name++; // skip past last path separator
2674 _len_prefix = strlen(JNI_LIB_PREFIX);
2675
2676 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2677 return false;
2678 }
2679
2680 _name += _len_prefix;
2681 _len_hprof = strlen(_hprof);
2682 _len_jdwp = strlen(_jdwp);
2683
2684 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2685 _name += _len_hprof;
2686 }
2687 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2688 _name += _len_jdwp;
2689 }
2690 else {
2691 return false;
2692 }
2693
2694 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2695 return false;
2696 }
2697
2698 return true;
2699 }
2700
2701 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2702 return true;
2703 }
2704
2705 return false;
2706 }
2707
2708 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2709 SysClassPath* scp_p,
2710 bool* scp_assembly_required_p,
2711 Flag::Flags origin) {
2712 // Remaining part of option string
2713 const char* tail;
2714
2715 // iterate over arguments
2716 for (int index = 0; index < args->nOptions; index++) {
2717 bool is_absolute_path = false; // for -agentpath vs -agentlib
2718
2719 const JavaVMOption* option = args->options + index;
2720
2721 if (!match_option(option, "-Djava.class.path", &tail) &&
2722 !match_option(option, "-Dsun.java.command", &tail) &&
2723 !match_option(option, "-Dsun.java.launcher", &tail)) {
2724
2725 // add all jvm options to the jvm_args string. This string
2726 // is used later to set the java.vm.args PerfData string constant.
2727 // the -Djava.class.path and the -Dsun.java.command options are
2728 // omitted from jvm_args string as each have their own PerfData
2729 // string constant object.
2730 build_jvm_args(option->optionString);
2731 }
2732
2733 // -verbose:[class/gc/jni]
2734 if (match_option(option, "-verbose", &tail)) {
2735 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2736 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2737 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2738 } else if (!strcmp(tail, ":gc")) {
2739 FLAG_SET_CMDLINE(bool, PrintGC, true);
2740 } else if (!strcmp(tail, ":jni")) {
2741 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2742 }
2743 // -da / -ea / -disableassertions / -enableassertions
2744 // These accept an optional class/package name separated by a colon, e.g.,
2745 // -da:java.lang.Thread.
2746 } else if (match_option(option, user_assertion_options, &tail, true)) {
2747 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2748 if (*tail == '\0') {
2749 JavaAssertions::setUserClassDefault(enable);
2750 } else {
2751 assert(*tail == ':', "bogus match by match_option()");
2752 JavaAssertions::addOption(tail + 1, enable);
2753 }
2754 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2755 } else if (match_option(option, system_assertion_options, &tail, false)) {
2756 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2757 JavaAssertions::setSystemClassDefault(enable);
2758 // -bootclasspath:
2759 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2760 scp_p->reset_path(tail);
2761 *scp_assembly_required_p = true;
2762 // -bootclasspath/a:
2763 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2764 scp_p->add_suffix(tail);
2765 *scp_assembly_required_p = true;
2766 // -bootclasspath/p:
2767 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2768 scp_p->add_prefix(tail);
2769 *scp_assembly_required_p = true;
2770 // -Xrun
2771 } else if (match_option(option, "-Xrun", &tail)) {
2772 if (tail != NULL) {
2773 const char* pos = strchr(tail, ':');
2774 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2775 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2776 name[len] = '\0';
2777
2778 char *options = NULL;
2779 if(pos != NULL) {
2780 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2781 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2782 }
2783 #if !INCLUDE_JVMTI
2784 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Profiling and debugging agents are not supported in this VM\n");
2787 return JNI_ERR;
2788 }
2789 #endif // !INCLUDE_JVMTI
2790 add_init_library(name, options);
2791 }
2792 // -agentlib and -agentpath
2793 } else if (match_option(option, "-agentlib:", &tail) ||
2794 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2795 if(tail != NULL) {
2796 const char* pos = strchr(tail, '=');
2797 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2798 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2799 name[len] = '\0';
2800
2801 char *options = NULL;
2802 if(pos != NULL) {
2803 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2804 }
2805 #if !INCLUDE_JVMTI
2806 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Profiling and debugging agents are not supported in this VM\n");
2809 return JNI_ERR;
2810 }
2811 #endif // !INCLUDE_JVMTI
2812 add_init_agent(name, options, is_absolute_path);
2813 }
2814 // -javaagent
2815 } else if (match_option(option, "-javaagent:", &tail)) {
2816 #if !INCLUDE_JVMTI
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Instrumentation agents are not supported in this VM\n");
2819 return JNI_ERR;
2820 #else
2821 if(tail != NULL) {
2822 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2823 add_init_agent("instrument", options, false);
2824 }
2825 #endif // !INCLUDE_JVMTI
2826 // -Xnoclassgc
2827 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2828 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2829 // -Xincgc: i-CMS
2830 } else if (match_option(option, "-Xincgc", &tail)) {
2831 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2832 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2833 // -Xnoincgc: no i-CMS
2834 } else if (match_option(option, "-Xnoincgc", &tail)) {
2835 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2836 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2837 // -Xconcgc
2838 } else if (match_option(option, "-Xconcgc", &tail)) {
2839 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2840 // -Xnoconcgc
2841 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2842 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2843 // -Xbatch
2844 } else if (match_option(option, "-Xbatch", &tail)) {
2845 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2846 // -Xmn for compatibility with other JVM vendors
2847 } else if (match_option(option, "-Xmn", &tail)) {
2848 julong long_initial_young_size = 0;
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial young generation size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2857 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2858 // -Xms
2859 } else if (match_option(option, "-Xms", &tail)) {
2860 julong long_initial_heap_size = 0;
2861 // an initial heap size of 0 means automatically determine
2862 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2863 if (errcode != arg_in_range) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Invalid initial heap size: %s\n", option->optionString);
2866 describe_range_error(errcode);
2867 return JNI_EINVAL;
2868 }
2869 set_min_heap_size((uintx)long_initial_heap_size);
2870 // Currently the minimum size and the initial heap sizes are the same.
2871 // Can be overridden with -XX:InitialHeapSize.
2872 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2873 // -Xmx
2874 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2875 julong long_max_heap_size = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid maximum heap size: %s\n", option->optionString);
2880 describe_range_error(errcode);
2881 return JNI_EINVAL;
2882 }
2883 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2884 // Xmaxf
2885 } else if (match_option(option, "-Xmaxf", &tail)) {
2886 char* err;
2887 int maxf = (int)(strtod(tail, &err) * 100);
2888 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Bad max heap free percentage size: %s\n",
2891 option->optionString);
2892 return JNI_EINVAL;
2893 } else {
2894 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2895 }
2896 // Xminf
2897 } else if (match_option(option, "-Xminf", &tail)) {
2898 char* err;
2899 int minf = (int)(strtod(tail, &err) * 100);
2900 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Bad min heap free percentage size: %s\n",
2903 option->optionString);
2904 return JNI_EINVAL;
2905 } else {
2906 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2907 }
2908 // -Xss
2909 } else if (match_option(option, "-Xss", &tail)) {
2910 julong long_ThreadStackSize = 0;
2911 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2912 if (errcode != arg_in_range) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Invalid thread stack size: %s\n", option->optionString);
2915 describe_range_error(errcode);
2916 return JNI_EINVAL;
2917 }
2918 // Internally track ThreadStackSize in units of 1024 bytes.
2919 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2920 round_to((int)long_ThreadStackSize, K) / K);
2921 // -Xoss
2922 } else if (match_option(option, "-Xoss", &tail)) {
2923 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2924 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2925 julong long_CodeCacheExpansionSize = 0;
2926 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2927 if (errcode != arg_in_range) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2930 os::vm_page_size()/K);
2931 return JNI_EINVAL;
2932 }
2933 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2934 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2935 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2936 julong long_ReservedCodeCacheSize = 0;
2937
2938 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2939 if (errcode != arg_in_range) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Invalid maximum code cache size: %s.\n", option->optionString);
2942 return JNI_EINVAL;
2943 }
2944 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2945 // -XX:NonNMethodCodeHeapSize=
2946 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2947 julong long_NonNMethodCodeHeapSize = 0;
2948
2949 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2950 if (errcode != arg_in_range) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2956 // -XX:ProfiledCodeHeapSize=
2957 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2958 julong long_ProfiledCodeHeapSize = 0;
2959
2960 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2961 if (errcode != arg_in_range) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2964 return JNI_EINVAL;
2965 }
2966 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2967 // -XX:NonProfiledCodeHeapSizee=
2968 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2969 julong long_NonProfiledCodeHeapSize = 0;
2970
2971 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2972 if (errcode != arg_in_range) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2975 return JNI_EINVAL;
2976 }
2977 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2978 //-XX:IncreaseFirstTierCompileThresholdAt=
2979 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2980 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2981 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2984 option->optionString);
2985 return JNI_EINVAL;
2986 }
2987 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2988 // -green
2989 } else if (match_option(option, "-green", &tail)) {
2990 jio_fprintf(defaultStream::error_stream(),
2991 "Green threads support not available\n");
2992 return JNI_EINVAL;
2993 // -native
2994 } else if (match_option(option, "-native", &tail)) {
2995 // HotSpot always uses native threads, ignore silently for compatibility
2996 // -Xsqnopause
2997 } else if (match_option(option, "-Xsqnopause", &tail)) {
2998 // EVM option, ignore silently for compatibility
2999 // -Xrs
3000 } else if (match_option(option, "-Xrs", &tail)) {
3001 // Classic/EVM option, new functionality
3002 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3003 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3004 // change default internal VM signals used - lower case for back compat
3005 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3006 // -Xoptimize
3007 } else if (match_option(option, "-Xoptimize", &tail)) {
3008 // EVM option, ignore silently for compatibility
3009 // -Xprof
3010 } else if (match_option(option, "-Xprof", &tail)) {
3011 #if INCLUDE_FPROF
3012 _has_profile = true;
3013 #else // INCLUDE_FPROF
3014 jio_fprintf(defaultStream::error_stream(),
3015 "Flat profiling is not supported in this VM.\n");
3016 return JNI_ERR;
3017 #endif // INCLUDE_FPROF
3018 // -Xconcurrentio
3019 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3020 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3021 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3022 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3023 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3024 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3025
3026 // -Xinternalversion
3027 } else if (match_option(option, "-Xinternalversion", &tail)) {
3028 jio_fprintf(defaultStream::output_stream(), "%s\n",
3029 VM_Version::internal_vm_info_string());
3030 vm_exit(0);
3031 #ifndef PRODUCT
3032 // -Xprintflags
3033 } else if (match_option(option, "-Xprintflags", &tail)) {
3034 CommandLineFlags::printFlags(tty, false);
3035 vm_exit(0);
3036 #endif
3037 // -D
3038 } else if (match_option(option, "-D", &tail)) {
3039 if (!add_property(tail)) {
3040 return JNI_ENOMEM;
3041 }
3042 // Out of the box management support
3043 if (match_option(option, "-Dcom.sun.management", &tail)) {
3044 #if INCLUDE_MANAGEMENT
3045 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3046 #else
3047 jio_fprintf(defaultStream::output_stream(),
3048 "-Dcom.sun.management is not supported in this VM.\n");
3049 return JNI_ERR;
3050 #endif
3051 }
3052 // -Xint
3053 } else if (match_option(option, "-Xint", &tail)) {
3054 set_mode_flags(_int);
3055 // -Xmixed
3056 } else if (match_option(option, "-Xmixed", &tail)) {
3057 set_mode_flags(_mixed);
3058 // -Xcomp
3059 } else if (match_option(option, "-Xcomp", &tail)) {
3060 // for testing the compiler; turn off all flags that inhibit compilation
3061 set_mode_flags(_comp);
3062 // -Xshare:dump
3063 } else if (match_option(option, "-Xshare:dump", &tail)) {
3064 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3065 set_mode_flags(_int); // Prevent compilation, which creates objects
3066 // -Xshare:on
3067 } else if (match_option(option, "-Xshare:on", &tail)) {
3068 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3069 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3070 // -Xshare:auto
3071 } else if (match_option(option, "-Xshare:auto", &tail)) {
3072 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3073 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3074 // -Xshare:off
3075 } else if (match_option(option, "-Xshare:off", &tail)) {
3076 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3077 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3078 // -Xverify
3079 } else if (match_option(option, "-Xverify", &tail)) {
3080 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3081 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3082 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3083 } else if (strcmp(tail, ":remote") == 0) {
3084 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3085 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3086 } else if (strcmp(tail, ":none") == 0) {
3087 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3088 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3089 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3090 return JNI_EINVAL;
3091 }
3092 // -Xdebug
3093 } else if (match_option(option, "-Xdebug", &tail)) {
3094 // note this flag has been used, then ignore
3095 set_xdebug_mode(true);
3096 // -Xnoagent
3097 } else if (match_option(option, "-Xnoagent", &tail)) {
3098 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3099 } else if (match_option(option, "-Xboundthreads", &tail)) {
3100 // Bind user level threads to kernel threads (Solaris only)
3101 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3102 } else if (match_option(option, "-Xloggc:", &tail)) {
3103 // Redirect GC output to the file. -Xloggc:<filename>
3104 // ostream_init_log(), when called will use this filename
3105 // to initialize a fileStream.
3106 _gc_log_filename = os::strdup_check_oom(tail);
3107 if (!is_filename_valid(_gc_log_filename)) {
3108 jio_fprintf(defaultStream::output_stream(),
3109 "Invalid file name for use with -Xloggc: Filename can only contain the "
3110 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3111 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3112 return JNI_EINVAL;
3113 }
3114 FLAG_SET_CMDLINE(bool, PrintGC, true);
3115 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3116
3117 // JNI hooks
3118 } else if (match_option(option, "-Xcheck", &tail)) {
3119 if (!strcmp(tail, ":jni")) {
3120 #if !INCLUDE_JNI_CHECK
3121 warning("JNI CHECKING is not supported in this VM");
3122 #else
3123 CheckJNICalls = true;
3124 #endif // INCLUDE_JNI_CHECK
3125 } else if (is_bad_option(option, args->ignoreUnrecognized,
3126 "check")) {
3127 return JNI_EINVAL;
3128 }
3129 } else if (match_option(option, "vfprintf", &tail)) {
3130 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3131 } else if (match_option(option, "exit", &tail)) {
3132 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3133 } else if (match_option(option, "abort", &tail)) {
3134 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3135 // -XX:+AggressiveHeap
3136 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3137
3138 // This option inspects the machine and attempts to set various
3139 // parameters to be optimal for long-running, memory allocation
3140 // intensive jobs. It is intended for machines with large
3141 // amounts of cpu and memory.
3142
3143 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3144 // VM, but we may not be able to represent the total physical memory
3145 // available (like having 8gb of memory on a box but using a 32bit VM).
3146 // Thus, we need to make sure we're using a julong for intermediate
3147 // calculations.
3148 julong initHeapSize;
3149 julong total_memory = os::physical_memory();
3150
3151 if (total_memory < (julong)256*M) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3154 vm_exit(1);
3155 }
3156
3157 // The heap size is half of available memory, or (at most)
3158 // all of possible memory less 160mb (leaving room for the OS
3159 // when using ISM). This is the maximum; because adaptive sizing
3160 // is turned on below, the actual space used may be smaller.
3161
3162 initHeapSize = MIN2(total_memory / (julong)2,
3163 total_memory - (julong)160*M);
3164
3165 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3166
3167 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3168 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3169 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3170 // Currently the minimum size and the initial heap sizes are the same.
3171 set_min_heap_size(initHeapSize);
3172 }
3173 if (FLAG_IS_DEFAULT(NewSize)) {
3174 // Make the young generation 3/8ths of the total heap.
3175 FLAG_SET_CMDLINE(uintx, NewSize,
3176 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3177 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3178 }
3179
3180 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3181 FLAG_SET_DEFAULT(UseLargePages, true);
3182 #endif
3183
3184 // Increase some data structure sizes for efficiency
3185 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3186 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3187 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3188
3189 // See the OldPLABSize comment below, but replace 'after promotion'
3190 // with 'after copying'. YoungPLABSize is the size of the survivor
3191 // space per-gc-thread buffers. The default is 4kw.
3192 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3193
3194 // OldPLABSize is the size of the buffers in the old gen that
3195 // UseParallelGC uses to promote live data that doesn't fit in the
3196 // survivor spaces. At any given time, there's one for each gc thread.
3197 // The default size is 1kw. These buffers are rarely used, since the
3198 // survivor spaces are usually big enough. For specjbb, however, there
3199 // are occasions when there's lots of live data in the young gen
3200 // and we end up promoting some of it. We don't have a definite
3201 // explanation for why bumping OldPLABSize helps, but the theory
3202 // is that a bigger PLAB results in retaining something like the
3203 // original allocation order after promotion, which improves mutator
3204 // locality. A minor effect may be that larger PLABs reduce the
3205 // number of PLAB allocation events during gc. The value of 8kw
3206 // was arrived at by experimenting with specjbb.
3207 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3208
3209 // Enable parallel GC and adaptive generation sizing
3210 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3211 FLAG_SET_DEFAULT(ParallelGCThreads,
3212 Abstract_VM_Version::parallel_worker_threads());
3213
3214 // Encourage steady state memory management
3215 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3216
3217 // This appears to improve mutator locality
3218 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3219
3220 // Get around early Solaris scheduling bug
3221 // (affinity vs other jobs on system)
3222 // but disallow DR and offlining (5008695).
3223 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3224
3225 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3226 // and the last option wins.
3227 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3228 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3229 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3230 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3231 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3232 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3233 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3234 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3235 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3236 uintx max_tenuring_thresh = 0;
3237 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3240 }
3241 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3242
3243 if (MaxTenuringThreshold == 0) {
3244 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3245 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3246 } else {
3247 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3248 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3249 }
3250 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3251 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Please use CMSClassUnloadingEnabled in place of "
3254 "CMSPermGenSweepingEnabled in the future\n");
3255 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3256 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Please use -XX:+UseGCOverheadLimit in place of "
3259 "-XX:+UseGCTimeLimit in the future\n");
3260 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3262 jio_fprintf(defaultStream::error_stream(),
3263 "Please use -XX:-UseGCOverheadLimit in place of "
3264 "-XX:-UseGCTimeLimit in the future\n");
3265 // The TLE options are for compatibility with 1.3 and will be
3266 // removed without notice in a future release. These options
3267 // are not to be documented.
3268 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3269 // No longer used.
3270 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3271 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3272 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3273 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3274 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3275 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3276 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3277 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3278 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3279 // No longer used.
3280 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3281 julong long_tlab_size = 0;
3282 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3283 if (errcode != arg_in_range) {
3284 jio_fprintf(defaultStream::error_stream(),
3285 "Invalid TLAB size: %s\n", option->optionString);
3286 describe_range_error(errcode);
3287 return JNI_EINVAL;
3288 }
3289 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3290 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3291 // No longer used.
3292 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3293 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3294 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3295 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3296 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3297 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3298 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3299 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3300 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3301 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3302 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3303 #if defined(DTRACE_ENABLED)
3304 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3305 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3306 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3307 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3308 #else // defined(DTRACE_ENABLED)
3309 jio_fprintf(defaultStream::error_stream(),
3310 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3311 return JNI_EINVAL;
3312 #endif // defined(DTRACE_ENABLED)
3313 #ifdef ASSERT
3314 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3315 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3316 // disable scavenge before parallel mark-compact
3317 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3318 #endif
3319 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3320 julong cms_blocks_to_claim = (julong)atol(tail);
3321 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Please use -XX:OldPLABSize in place of "
3324 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3325 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3326 julong cms_blocks_to_claim = (julong)atol(tail);
3327 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Please use -XX:OldPLABSize in place of "
3330 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3331 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3332 julong old_plab_size = 0;
3333 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3334 if (errcode != arg_in_range) {
3335 jio_fprintf(defaultStream::error_stream(),
3336 "Invalid old PLAB size: %s\n", option->optionString);
3337 describe_range_error(errcode);
3338 return JNI_EINVAL;
3339 }
3340 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Please use -XX:OldPLABSize in place of "
3343 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3344 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3345 julong young_plab_size = 0;
3346 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3347 if (errcode != arg_in_range) {
3348 jio_fprintf(defaultStream::error_stream(),
3349 "Invalid young PLAB size: %s\n", option->optionString);
3350 describe_range_error(errcode);
3351 return JNI_EINVAL;
3352 }
3353 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3354 jio_fprintf(defaultStream::error_stream(),
3355 "Please use -XX:YoungPLABSize in place of "
3356 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3357 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3358 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3359 julong stack_size = 0;
3360 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3361 if (errcode != arg_in_range) {
3362 jio_fprintf(defaultStream::error_stream(),
3363 "Invalid mark stack size: %s\n", option->optionString);
3364 describe_range_error(errcode);
3365 return JNI_EINVAL;
3366 }
3367 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3368 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3369 julong max_stack_size = 0;
3370 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3371 if (errcode != arg_in_range) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "Invalid maximum mark stack size: %s\n",
3374 option->optionString);
3375 describe_range_error(errcode);
3376 return JNI_EINVAL;
3377 }
3378 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3379 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3380 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3381 uintx conc_threads = 0;
3382 if (!parse_uintx(tail, &conc_threads, 1)) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Invalid concurrent threads: %s\n", option->optionString);
3385 return JNI_EINVAL;
3386 }
3387 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3388 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3389 julong max_direct_memory_size = 0;
3390 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3391 if (errcode != arg_in_range) {
3392 jio_fprintf(defaultStream::error_stream(),
3393 "Invalid maximum direct memory size: %s\n",
3394 option->optionString);
3395 describe_range_error(errcode);
3396 return JNI_EINVAL;
3397 }
3398 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3399 #if !INCLUDE_MANAGEMENT
3400 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "ManagementServer is not supported in this VM.\n");
3403 return JNI_ERR;
3404 #endif // INCLUDE_MANAGEMENT
3405 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3406 // Skip -XX:Flags= since that case has already been handled
3407 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3408 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3409 return JNI_EINVAL;
3410 }
3411 }
3412 // Unknown option
3413 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3414 return JNI_ERR;
3415 }
3416 }
3417
3418 // PrintSharedArchiveAndExit will turn on
3419 // -Xshare:on
3420 // -XX:+TraceClassPaths
3421 if (PrintSharedArchiveAndExit) {
3422 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3423 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3424 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3425 }
3426
3427 // Change the default value for flags which have different default values
3428 // when working with older JDKs.
3429 #ifdef LINUX
3430 if (JDK_Version::current().compare_major(6) <= 0 &&
3431 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3432 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3433 }
3434 #endif // LINUX
3435 fix_appclasspath();
3436 return JNI_OK;
3437 }
3438
3439 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3440 //
3441 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3442 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3443 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3444 // path is treated as the current directory.
3445 //
3446 // This causes problems with CDS, which requires that all directories specified in the classpath
3447 // must be empty. In most cases, applications do NOT want to load classes from the current
3448 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3449 // scripts compatible with CDS.
3450 void Arguments::fix_appclasspath() {
3451 if (IgnoreEmptyClassPaths) {
3452 const char separator = *os::path_separator();
3453 const char* src = _java_class_path->value();
3454
3455 // skip over all the leading empty paths
3456 while (*src == separator) {
3457 src ++;
3458 }
3459
3460 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3461 strncpy(copy, src, strlen(src) + 1);
3462
3463 // trim all trailing empty paths
3464 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3465 *tail = '\0';
3466 }
3467
3468 char from[3] = {separator, separator, '\0'};
3469 char to [2] = {separator, '\0'};
3470 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3471 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3472 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3473 }
3474
3475 _java_class_path->set_value(copy);
3476 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3477 }
3478
3479 if (!PrintSharedArchiveAndExit) {
3480 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3481 }
3482 }
3483
3484 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3485 // This must be done after all -D arguments have been processed.
3486 scp_p->expand_endorsed();
3487
3488 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3489 // Assemble the bootclasspath elements into the final path.
3490 Arguments::set_sysclasspath(scp_p->combined_path());
3491 }
3492
3493 // This must be done after all arguments have been processed.
3494 // java_compiler() true means set to "NONE" or empty.
3495 if (java_compiler() && !xdebug_mode()) {
3496 // For backwards compatibility, we switch to interpreted mode if
3497 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3498 // not specified.
3499 set_mode_flags(_int);
3500 }
3501 if (CompileThreshold == 0) {
3502 set_mode_flags(_int);
3503 }
3504
3505 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3506 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3507 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3508 }
3509
3510 #ifndef COMPILER2
3511 // Don't degrade server performance for footprint
3512 if (FLAG_IS_DEFAULT(UseLargePages) &&
3513 MaxHeapSize < LargePageHeapSizeThreshold) {
3514 // No need for large granularity pages w/small heaps.
3515 // Note that large pages are enabled/disabled for both the
3516 // Java heap and the code cache.
3517 FLAG_SET_DEFAULT(UseLargePages, false);
3518 }
3519
3520 #else
3521 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3522 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3523 }
3524 #endif
3525
3526 #ifndef TIERED
3527 // Tiered compilation is undefined.
3528 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3529 #endif
3530
3531 // If we are running in a headless jre, force java.awt.headless property
3532 // to be true unless the property has already been set.
3533 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3534 if (os::is_headless_jre()) {
3535 const char* headless = Arguments::get_property("java.awt.headless");
3536 if (headless == NULL) {
3537 char envbuffer[128];
3538 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3539 if (!add_property("java.awt.headless=true")) {
3540 return JNI_ENOMEM;
3541 }
3542 } else {
3543 char buffer[256];
3544 strcpy(buffer, "java.awt.headless=");
3545 strcat(buffer, envbuffer);
3546 if (!add_property(buffer)) {
3547 return JNI_ENOMEM;
3548 }
3549 }
3550 }
3551 }
3552
3553 if (!ArgumentsExt::check_vm_args_consistency()) {
3554 return JNI_ERR;
3555 }
3556
3557 return JNI_OK;
3558 }
3559
3560 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3561 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3562 scp_assembly_required_p);
3563 }
3564
3565 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3566 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3567 scp_assembly_required_p);
3568 }
3569
3570 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3571 const int N_MAX_OPTIONS = 64;
3572 const int OPTION_BUFFER_SIZE = 1024;
3573 char buffer[OPTION_BUFFER_SIZE];
3574
3575 // The variable will be ignored if it exceeds the length of the buffer.
3576 // Don't check this variable if user has special privileges
3577 // (e.g. unix su command).
3578 if (os::getenv(name, buffer, sizeof(buffer)) &&
3579 !os::have_special_privileges()) {
3580 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3581 jio_fprintf(defaultStream::error_stream(),
3582 "Picked up %s: %s\n", name, buffer);
3583 char* rd = buffer; // pointer to the input string (rd)
3584 int i;
3585 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3586 while (isspace(*rd)) rd++; // skip whitespace
3587 if (*rd == 0) break; // we re done when the input string is read completely
3588
3589 // The output, option string, overwrites the input string.
3590 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3591 // input string (rd).
3592 char* wrt = rd;
3593
3594 options[i++].optionString = wrt; // Fill in option
3595 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3596 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3597 int quote = *rd; // matching quote to look for
3598 rd++; // don't copy open quote
3599 while (*rd != quote) { // include everything (even spaces) up until quote
3600 if (*rd == 0) { // string termination means unmatched string
3601 jio_fprintf(defaultStream::error_stream(),
3602 "Unmatched quote in %s\n", name);
3603 return JNI_ERR;
3604 }
3605 *wrt++ = *rd++; // copy to option string
3606 }
3607 rd++; // don't copy close quote
3608 } else {
3609 *wrt++ = *rd++; // copy to option string
3610 }
3611 }
3612 // Need to check if we're done before writing a NULL,
3613 // because the write could be to the byte that rd is pointing to.
3614 if (*rd++ == 0) {
3615 *wrt = 0;
3616 break;
3617 }
3618 *wrt = 0; // Zero terminate option
3619 }
3620 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3621 JavaVMInitArgs vm_args;
3622 vm_args.version = JNI_VERSION_1_2;
3623 vm_args.options = options;
3624 vm_args.nOptions = i;
3625 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3626
3627 if (PrintVMOptions) {
3628 const char* tail;
3629 for (int i = 0; i < vm_args.nOptions; i++) {
3630 const JavaVMOption *option = vm_args.options + i;
3631 if (match_option(option, "-XX:", &tail)) {
3632 logOption(tail);
3633 }
3634 }
3635 }
3636
3637 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3638 }
3639 return JNI_OK;
3640 }
3641
3642 void Arguments::set_shared_spaces_flags() {
3643 if (DumpSharedSpaces) {
3644 if (RequireSharedSpaces) {
3645 warning("cannot dump shared archive while using shared archive");
3646 }
3647 UseSharedSpaces = false;
3648 #ifdef _LP64
3649 if (!UseCompressedOops || !UseCompressedClassPointers) {
3650 vm_exit_during_initialization(
3651 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3652 }
3653 } else {
3654 if (!UseCompressedOops || !UseCompressedClassPointers) {
3655 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3656 }
3657 #endif
3658 }
3659 }
3660
3661 #if !INCLUDE_ALL_GCS
3662 static void force_serial_gc() {
3663 FLAG_SET_DEFAULT(UseSerialGC, true);
3664 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3665 UNSUPPORTED_GC_OPTION(UseG1GC);
3666 UNSUPPORTED_GC_OPTION(UseParallelGC);
3667 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3668 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3669 UNSUPPORTED_GC_OPTION(UseParNewGC);
3670 }
3671 #endif // INCLUDE_ALL_GCS
3672
3673 // Sharing support
3674 // Construct the path to the archive
3675 static char* get_shared_archive_path() {
3676 char *shared_archive_path;
3677 if (SharedArchiveFile == NULL) {
3678 char jvm_path[JVM_MAXPATHLEN];
3679 os::jvm_path(jvm_path, sizeof(jvm_path));
3680 char *end = strrchr(jvm_path, *os::file_separator());
3681 if (end != NULL) *end = '\0';
3682 size_t jvm_path_len = strlen(jvm_path);
3683 size_t file_sep_len = strlen(os::file_separator());
3684 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3685 file_sep_len + 20, mtInternal);
3686 if (shared_archive_path != NULL) {
3687 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3688 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3689 strncat(shared_archive_path, "classes.jsa", 11);
3690 }
3691 } else {
3692 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3693 if (shared_archive_path != NULL) {
3694 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3695 }
3696 }
3697 return shared_archive_path;
3698 }
3699
3700 #ifndef PRODUCT
3701 // Determine whether LogVMOutput should be implicitly turned on.
3702 static bool use_vm_log() {
3703 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3704 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3705 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3706 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3707 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3708 return true;
3709 }
3710
3711 #ifdef COMPILER1
3712 if (PrintC1Statistics) {
3713 return true;
3714 }
3715 #endif // COMPILER1
3716
3717 #ifdef COMPILER2
3718 if (PrintOptoAssembly || PrintOptoStatistics) {
3719 return true;
3720 }
3721 #endif // COMPILER2
3722
3723 return false;
3724 }
3725 #endif // PRODUCT
3726
3727 // Parse entry point called from JNI_CreateJavaVM
3728
3729 jint Arguments::parse(const JavaVMInitArgs* args) {
3730
3731 // Remaining part of option string
3732 const char* tail;
3733
3734 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3735 const char* hotspotrc = ".hotspotrc";
3736 bool settings_file_specified = false;
3737 bool needs_hotspotrc_warning = false;
3738
3739 const char* flags_file;
3740 int index;
3741 for (index = 0; index < args->nOptions; index++) {
3742 const JavaVMOption *option = args->options + index;
3743 if (match_option(option, "-XX:Flags=", &tail)) {
3744 flags_file = tail;
3745 settings_file_specified = true;
3746 }
3747 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3748 PrintVMOptions = true;
3749 }
3750 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3751 PrintVMOptions = false;
3752 }
3753 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3754 IgnoreUnrecognizedVMOptions = true;
3755 }
3756 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3757 IgnoreUnrecognizedVMOptions = false;
3758 }
3759 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3760 CommandLineFlags::printFlags(tty, false);
3761 vm_exit(0);
3762 }
3763 #if INCLUDE_NMT
3764 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3765 // The launcher did not setup nmt environment variable properly.
3766 if (!MemTracker::check_launcher_nmt_support(tail)) {
3767 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3768 }
3769
3770 // Verify if nmt option is valid.
3771 if (MemTracker::verify_nmt_option()) {
3772 // Late initialization, still in single-threaded mode.
3773 if (MemTracker::tracking_level() >= NMT_summary) {
3774 MemTracker::init();
3775 }
3776 } else {
3777 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3778 }
3779 }
3780 #endif
3781
3782
3783 #ifndef PRODUCT
3784 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3785 CommandLineFlags::printFlags(tty, true);
3786 vm_exit(0);
3787 }
3788 #endif
3789 }
3790
3791 if (IgnoreUnrecognizedVMOptions) {
3792 // uncast const to modify the flag args->ignoreUnrecognized
3793 *(jboolean*)(&args->ignoreUnrecognized) = true;
3794 }
3795
3796 // Parse specified settings file
3797 if (settings_file_specified) {
3798 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3799 return JNI_EINVAL;
3800 }
3801 } else {
3802 #ifdef ASSERT
3803 // Parse default .hotspotrc settings file
3804 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3805 return JNI_EINVAL;
3806 }
3807 #else
3808 struct stat buf;
3809 if (os::stat(hotspotrc, &buf) == 0) {
3810 needs_hotspotrc_warning = true;
3811 }
3812 #endif
3813 }
3814
3815 if (PrintVMOptions) {
3816 for (index = 0; index < args->nOptions; index++) {
3817 const JavaVMOption *option = args->options + index;
3818 if (match_option(option, "-XX:", &tail)) {
3819 logOption(tail);
3820 }
3821 }
3822 }
3823
3824 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3825 jint result = parse_vm_init_args(args);
3826 if (result != JNI_OK) {
3827 return result;
3828 }
3829
3830 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3831 SharedArchivePath = get_shared_archive_path();
3832 if (SharedArchivePath == NULL) {
3833 return JNI_ENOMEM;
3834 }
3835
3836 // Delay warning until here so that we've had a chance to process
3837 // the -XX:-PrintWarnings flag
3838 if (needs_hotspotrc_warning) {
3839 warning("%s file is present but has been ignored. "
3840 "Run with -XX:Flags=%s to load the file.",
3841 hotspotrc, hotspotrc);
3842 }
3843
3844 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3845 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3846 #endif
3847
3848 #if INCLUDE_ALL_GCS
3849 #if (defined JAVASE_EMBEDDED || defined ARM)
3850 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3851 #endif
3852 #endif
3853
3854 #ifndef PRODUCT
3855 if (TraceBytecodesAt != 0) {
3856 TraceBytecodes = true;
3857 }
3858 if (CountCompiledCalls) {
3859 if (UseCounterDecay) {
3860 warning("UseCounterDecay disabled because CountCalls is set");
3861 UseCounterDecay = false;
3862 }
3863 }
3864 #endif // PRODUCT
3865
3866 if (ScavengeRootsInCode == 0) {
3867 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3868 warning("forcing ScavengeRootsInCode non-zero");
3869 }
3870 ScavengeRootsInCode = 1;
3871 }
3872
3873 if (PrintGCDetails) {
3874 // Turn on -verbose:gc options as well
3875 PrintGC = true;
3876 }
3877
3878 // Set object alignment values.
3879 set_object_alignment();
3880
3881 #if !INCLUDE_ALL_GCS
3882 force_serial_gc();
3883 #endif // INCLUDE_ALL_GCS
3884 #if !INCLUDE_CDS
3885 if (DumpSharedSpaces || RequireSharedSpaces) {
3886 jio_fprintf(defaultStream::error_stream(),
3887 "Shared spaces are not supported in this VM\n");
3888 return JNI_ERR;
3889 }
3890 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3891 warning("Shared spaces are not supported in this VM");
3892 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3893 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3894 }
3895 no_shared_spaces("CDS Disabled");
3896 #endif // INCLUDE_CDS
3897
3898 return JNI_OK;
3899 }
3900
3901 jint Arguments::apply_ergo() {
3902
3903 // Set flags based on ergonomics.
3904 set_ergonomics_flags();
3905
3906 set_shared_spaces_flags();
3907
3908 // Check the GC selections again.
3909 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3910 return JNI_EINVAL;
3911 }
3912
3913 if (TieredCompilation) {
3914 set_tiered_flags();
3915 } else {
3916 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3917 if (CompilationPolicyChoice >= 2) {
3918 vm_exit_during_initialization(
3919 "Incompatible compilation policy selected", NULL);
3920 }
3921 }
3922
3923 // Set heap size based on available physical memory
3924 set_heap_size();
3925
3926 set_gc_specific_flags();
3927
3928 // Initialize Metaspace flags and alignments
3929 Metaspace::ergo_initialize();
3930
3931 // Set bytecode rewriting flags
3932 set_bytecode_flags();
3933
3934 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3935 set_aggressive_opts_flags();
3936
3937 // Turn off biased locking for locking debug mode flags,
3938 // which are subtly different from each other but neither works with
3939 // biased locking
3940 if (UseHeavyMonitors
3941 #ifdef COMPILER1
3942 || !UseFastLocking
3943 #endif // COMPILER1
3944 ) {
3945 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3946 // flag set to true on command line; warn the user that they
3947 // can't enable biased locking here
3948 warning("Biased Locking is not supported with locking debug flags"
3949 "; ignoring UseBiasedLocking flag." );
3950 }
3951 UseBiasedLocking = false;
3952 }
3953
3954 #ifdef ZERO
3955 // Clear flags not supported on zero.
3956 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3957 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3958 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3959 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3960 #endif // CC_INTERP
3961
3962 #ifdef COMPILER2
3963 if (!EliminateLocks) {
3964 EliminateNestedLocks = false;
3965 }
3966 if (!Inline) {
3967 IncrementalInline = false;
3968 }
3969 #ifndef PRODUCT
3970 if (!IncrementalInline) {
3971 AlwaysIncrementalInline = false;
3972 }
3973 #endif
3974 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3975 // nothing to use the profiling, turn if off
3976 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3977 }
3978 #endif
3979
3980 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3981 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3982 DebugNonSafepoints = true;
3983 }
3984
3985 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3986 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3987 }
3988
3989 #ifndef PRODUCT
3990 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3991 if (use_vm_log()) {
3992 LogVMOutput = true;
3993 }
3994 }
3995 #endif // PRODUCT
3996
3997 if (PrintCommandLineFlags) {
3998 CommandLineFlags::printSetFlags(tty);
3999 }
4000
4001 // Apply CPU specific policy for the BiasedLocking
4002 if (UseBiasedLocking) {
4003 if (!VM_Version::use_biased_locking() &&
4004 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4005 UseBiasedLocking = false;
4006 }
4007 }
4008 #ifdef COMPILER2
4009 if (!UseBiasedLocking || EmitSync != 0) {
4010 UseOptoBiasInlining = false;
4011 }
4012 #endif
4013
4014 return JNI_OK;
4015 }
4016
4017 jint Arguments::adjust_after_os() {
4018 if (UseNUMA) {
4019 if (UseParallelGC || UseParallelOldGC) {
4020 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4021 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4022 }
4023 }
4024 // UseNUMAInterleaving is set to ON for all collectors and
4025 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4026 // such as the parallel collector for Linux and Solaris will
4027 // interleave old gen and survivor spaces on top of NUMA
4028 // allocation policy for the eden space.
4029 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4030 // all platforms and ParallelGC on Windows will interleave all
4031 // of the heap spaces across NUMA nodes.
4032 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4033 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4034 }
4035 }
4036 return JNI_OK;
4037 }
4038
4039 int Arguments::PropertyList_count(SystemProperty* pl) {
4040 int count = 0;
4041 while(pl != NULL) {
4042 count++;
4043 pl = pl->next();
4044 }
4045 return count;
4046 }
4047
4048 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4049 assert(key != NULL, "just checking");
4050 SystemProperty* prop;
4051 for (prop = pl; prop != NULL; prop = prop->next()) {
4052 if (strcmp(key, prop->key()) == 0) return prop->value();
4053 }
4054 return NULL;
4055 }
4056
4057 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4058 int count = 0;
4059 const char* ret_val = NULL;
4060
4061 while(pl != NULL) {
4062 if(count >= index) {
4063 ret_val = pl->key();
4064 break;
4065 }
4066 count++;
4067 pl = pl->next();
4068 }
4069
4070 return ret_val;
4071 }
4072
4073 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4074 int count = 0;
4075 char* ret_val = NULL;
4076
4077 while(pl != NULL) {
4078 if(count >= index) {
4079 ret_val = pl->value();
4080 break;
4081 }
4082 count++;
4083 pl = pl->next();
4084 }
4085
4086 return ret_val;
4087 }
4088
4089 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4090 SystemProperty* p = *plist;
4091 if (p == NULL) {
4092 *plist = new_p;
4093 } else {
4094 while (p->next() != NULL) {
4095 p = p->next();
4096 }
4097 p->set_next(new_p);
4098 }
4099 }
4100
4101 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4102 if (plist == NULL)
4103 return;
4104
4105 SystemProperty* new_p = new SystemProperty(k, v, true);
4106 PropertyList_add(plist, new_p);
4107 }
4108
4109 // This add maintains unique property key in the list.
4110 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4111 if (plist == NULL)
4112 return;
4113
4114 // If property key exist then update with new value.
4115 SystemProperty* prop;
4116 for (prop = *plist; prop != NULL; prop = prop->next()) {
4117 if (strcmp(k, prop->key()) == 0) {
4118 if (append) {
4119 prop->append_value(v);
4120 } else {
4121 prop->set_value(v);
4122 }
4123 return;
4124 }
4125 }
4126
4127 PropertyList_add(plist, k, v);
4128 }
4129
4130 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4131 // Returns true if all of the source pointed by src has been copied over to
4132 // the destination buffer pointed by buf. Otherwise, returns false.
4133 // Notes:
4134 // 1. If the length (buflen) of the destination buffer excluding the
4135 // NULL terminator character is not long enough for holding the expanded
4136 // pid characters, it also returns false instead of returning the partially
4137 // expanded one.
4138 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4139 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4140 char* buf, size_t buflen) {
4141 const char* p = src;
4142 char* b = buf;
4143 const char* src_end = &src[srclen];
4144 char* buf_end = &buf[buflen - 1];
4145
4146 while (p < src_end && b < buf_end) {
4147 if (*p == '%') {
4148 switch (*(++p)) {
4149 case '%': // "%%" ==> "%"
4150 *b++ = *p++;
4151 break;
4152 case 'p': { // "%p" ==> current process id
4153 // buf_end points to the character before the last character so
4154 // that we could write '\0' to the end of the buffer.
4155 size_t buf_sz = buf_end - b + 1;
4156 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4157
4158 // if jio_snprintf fails or the buffer is not long enough to hold
4159 // the expanded pid, returns false.
4160 if (ret < 0 || ret >= (int)buf_sz) {
4161 return false;
4162 } else {
4163 b += ret;
4164 assert(*b == '\0', "fail in copy_expand_pid");
4165 if (p == src_end && b == buf_end + 1) {
4166 // reach the end of the buffer.
4167 return true;
4168 }
4169 }
4170 p++;
4171 break;
4172 }
4173 default :
4174 *b++ = '%';
4175 }
4176 } else {
4177 *b++ = *p++;
4178 }
4179 }
4180 *b = '\0';
4181 return (p == src_end); // return false if not all of the source was copied
4182 }