1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 // Disable options not supported in this release, with a warning if they
61 // were explicitly requested on the command-line
62 #define UNSUPPORTED_OPTION(opt, description) \
63 do { \
64 if (opt) { \
65 if (FLAG_IS_CMDLINE(opt)) { \
66 warning(description " is disabled in this release."); \
67 } \
68 FLAG_SET_DEFAULT(opt, false); \
69 } \
70 } while(0)
71
72 #define UNSUPPORTED_GC_OPTION(gc) \
73 do { \
74 if (gc) { \
75 if (FLAG_IS_CMDLINE(gc)) { \
76 warning(#gc " is not supported in this VM. Using Serial GC."); \
77 } \
78 FLAG_SET_DEFAULT(gc, false); \
79 } \
80 } while(0)
81
82 char** Arguments::_jvm_flags_array = NULL;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = NULL;
85 int Arguments::_num_jvm_args = 0;
86 char* Arguments::_java_command = NULL;
87 SystemProperty* Arguments::_system_properties = NULL;
88 const char* Arguments::_gc_log_filename = NULL;
89 bool Arguments::_has_profile = false;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 uintx Arguments::_min_heap_size = 0;
92 uintx Arguments::_min_heap_free_ratio = 0;
93 uintx Arguments::_max_heap_free_ratio = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 bool Arguments::_java_compiler = false;
96 bool Arguments::_xdebug_mode = false;
97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 int Arguments::_sun_java_launcher_pid = -1;
100 bool Arguments::_sun_java_launcher_is_altjvm = false;
101
102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107
108 char* Arguments::SharedArchivePath = NULL;
109
110 AgentLibraryList Arguments::_libraryList;
111 AgentLibraryList Arguments::_agentList;
112
113 abort_hook_t Arguments::_abort_hook = NULL;
114 exit_hook_t Arguments::_exit_hook = NULL;
115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
116
117
118 SystemProperty *Arguments::_java_ext_dirs = NULL;
119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
121 SystemProperty *Arguments::_java_library_path = NULL;
122 SystemProperty *Arguments::_java_home = NULL;
123 SystemProperty *Arguments::_java_class_path = NULL;
124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
125
126 char* Arguments::_meta_index_path = NULL;
127 char* Arguments::_meta_index_dir = NULL;
128
129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
130
131 static bool match_option(const JavaVMOption *option, const char* name,
132 const char** tail) {
133 int len = (int)strlen(name);
134 if (strncmp(option->optionString, name, len) == 0) {
135 *tail = option->optionString + len;
136 return true;
137 } else {
138 return false;
139 }
140 }
141
142 static void logOption(const char* opt) {
143 if (PrintVMOptions) {
144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
145 }
146 }
147
148 // Process java launcher properties.
149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
151 // sun.java.launcher.pid is defined.
152 // Must do this before setting up other system properties,
153 // as some of them may depend on launcher type.
154 for (int index = 0; index < args->nOptions; index++) {
155 const JavaVMOption* option = args->options + index;
156 const char* tail;
157
158 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
159 process_java_launcher_argument(tail, option->extraInfo);
160 continue;
161 }
162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
163 if (strcmp(tail, "true") == 0) {
164 _sun_java_launcher_is_altjvm = true;
165 }
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
174
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
177
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
183
184 // Following are JVMTI agent writable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
193
194 _java_class_path = new SystemProperty("java.class.path", "", true);
195
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
204
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
208
209
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
216
217 spec_vendor = "Oracle Corporation";
218 spec_version = JDK_Version::current().major_version();
219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220
221 PropertyList_add(&_system_properties,
222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.version", buffer, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
227 }
228
229 /**
230 * Provide a slightly more user-friendly way of eliminating -XX flags.
231 * When a flag is eliminated, it can be added to this list in order to
232 * continue accepting this flag on the command-line, while issuing a warning
233 * and ignoring the value. Once the JDK version reaches the 'accept_until'
234 * limit, we flatly refuse to admit the existence of the flag. This allows
235 * a flag to die correctly over JDK releases using HSX.
236 */
237 typedef struct {
238 const char* name;
239 JDK_Version obsoleted_in; // when the flag went away
240 JDK_Version accept_until; // which version to start denying the existence
241 } ObsoleteFlag;
242
243 static ObsoleteFlag obsolete_jvm_flags[] = {
244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
259 { "DefaultInitialRAMFraction",
260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "UseDepthFirstScavengeOrder",
262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
263 { "HandlePromotionFailure",
264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
265 { "MaxLiveObjectEvacuationRatio",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
268 { "UseParallelOldGCCompacting",
269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
270 { "UseParallelDensePrefixUpdate",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelOldGCDensePrefix",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
296 #ifdef PRODUCT
297 { "DesiredMethodLimit",
298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
299 #endif // PRODUCT
300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 #ifndef ZERO
310 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 #endif // ZERO
313 { NULL, JDK_Version(0), JDK_Version(0) }
314 };
315
316 // Returns true if the flag is obsolete and fits into the range specified
317 // for being ignored. In the case that the flag is ignored, the 'version'
318 // value is filled in with the version number when the flag became
319 // obsolete so that that value can be displayed to the user.
320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
321 int i = 0;
322 assert(version != NULL, "Must provide a version buffer");
323 while (obsolete_jvm_flags[i].name != NULL) {
324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
325 // <flag>=xxx form
326 // [-|+]<flag> form
327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
328 ((s[0] == '+' || s[0] == '-') &&
329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
331 *version = flag_status.obsoleted_in;
332 return true;
333 }
334 }
335 i++;
336 }
337 return false;
338 }
339
340 // Constructs the system class path (aka boot class path) from the following
341 // components, in order:
342 //
343 // prefix // from -Xbootclasspath/p:...
344 // endorsed // the expansion of -Djava.endorsed.dirs=...
345 // base // from os::get_system_properties() or -Xbootclasspath=
346 // suffix // from -Xbootclasspath/a:...
347 //
348 // java.endorsed.dirs is a list of directories; any jar or zip files in the
349 // directories are added to the sysclasspath just before the base.
350 //
351 // This could be AllStatic, but it isn't needed after argument processing is
352 // complete.
353 class SysClassPath: public StackObj {
354 public:
355 SysClassPath(const char* base);
356 ~SysClassPath();
357
358 inline void set_base(const char* base);
359 inline void add_prefix(const char* prefix);
360 inline void add_suffix_to_prefix(const char* suffix);
361 inline void add_suffix(const char* suffix);
362 inline void reset_path(const char* base);
363
364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
365 // property. Must be called after all command-line arguments have been
366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
367 // combined_path().
368 void expand_endorsed();
369
370 inline const char* get_base() const { return _items[_scp_base]; }
371 inline const char* get_prefix() const { return _items[_scp_prefix]; }
372 inline const char* get_suffix() const { return _items[_scp_suffix]; }
373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
374
375 // Combine all the components into a single c-heap-allocated string; caller
376 // must free the string if/when no longer needed.
377 char* combined_path();
378
379 private:
380 // Utility routines.
381 static char* add_to_path(const char* path, const char* str, bool prepend);
382 static char* add_jars_to_path(char* path, const char* directory);
383
384 inline void reset_item_at(int index);
385
386 // Array indices for the items that make up the sysclasspath. All except the
387 // base are allocated in the C heap and freed by this class.
388 enum {
389 _scp_prefix, // from -Xbootclasspath/p:...
390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
391 _scp_base, // the default sysclasspath
392 _scp_suffix, // from -Xbootclasspath/a:...
393 _scp_nitems // the number of items, must be last.
394 };
395
396 const char* _items[_scp_nitems];
397 DEBUG_ONLY(bool _expansion_done;)
398 };
399
400 SysClassPath::SysClassPath(const char* base) {
401 memset(_items, 0, sizeof(_items));
402 _items[_scp_base] = base;
403 DEBUG_ONLY(_expansion_done = false;)
404 }
405
406 SysClassPath::~SysClassPath() {
407 // Free everything except the base.
408 for (int i = 0; i < _scp_nitems; ++i) {
409 if (i != _scp_base) reset_item_at(i);
410 }
411 DEBUG_ONLY(_expansion_done = false;)
412 }
413
414 inline void SysClassPath::set_base(const char* base) {
415 _items[_scp_base] = base;
416 }
417
418 inline void SysClassPath::add_prefix(const char* prefix) {
419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
420 }
421
422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
424 }
425
426 inline void SysClassPath::add_suffix(const char* suffix) {
427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
428 }
429
430 inline void SysClassPath::reset_item_at(int index) {
431 assert(index < _scp_nitems && index != _scp_base, "just checking");
432 if (_items[index] != NULL) {
433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
434 _items[index] = NULL;
435 }
436 }
437
438 inline void SysClassPath::reset_path(const char* base) {
439 // Clear the prefix and suffix.
440 reset_item_at(_scp_prefix);
441 reset_item_at(_scp_suffix);
442 set_base(base);
443 }
444
445 //------------------------------------------------------------------------------
446
447 void SysClassPath::expand_endorsed() {
448 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
449
450 const char* path = Arguments::get_property("java.endorsed.dirs");
451 if (path == NULL) {
452 path = Arguments::get_endorsed_dir();
453 assert(path != NULL, "no default for java.endorsed.dirs");
454 }
455
456 char* expanded_path = NULL;
457 const char separator = *os::path_separator();
458 const char* const end = path + strlen(path);
459 while (path < end) {
460 const char* tmp_end = strchr(path, separator);
461 if (tmp_end == NULL) {
462 expanded_path = add_jars_to_path(expanded_path, path);
463 path = end;
464 } else {
465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
466 memcpy(dirpath, path, tmp_end - path);
467 dirpath[tmp_end - path] = '\0';
468 expanded_path = add_jars_to_path(expanded_path, dirpath);
469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
470 path = tmp_end + 1;
471 }
472 }
473 _items[_scp_endorsed] = expanded_path;
474 DEBUG_ONLY(_expansion_done = true;)
475 }
476
477 // Combine the bootclasspath elements, some of which may be null, into a single
478 // c-heap-allocated string.
479 char* SysClassPath::combined_path() {
480 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
481 assert(_expansion_done, "must call expand_endorsed() first.");
482
483 size_t lengths[_scp_nitems];
484 size_t total_len = 0;
485
486 const char separator = *os::path_separator();
487
488 // Get the lengths.
489 int i;
490 for (i = 0; i < _scp_nitems; ++i) {
491 if (_items[i] != NULL) {
492 lengths[i] = strlen(_items[i]);
493 // Include space for the separator char (or a NULL for the last item).
494 total_len += lengths[i] + 1;
495 }
496 }
497 assert(total_len > 0, "empty sysclasspath not allowed");
498
499 // Copy the _items to a single string.
500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
501 char* cp_tmp = cp;
502 for (i = 0; i < _scp_nitems; ++i) {
503 if (_items[i] != NULL) {
504 memcpy(cp_tmp, _items[i], lengths[i]);
505 cp_tmp += lengths[i];
506 *cp_tmp++ = separator;
507 }
508 }
509 *--cp_tmp = '\0'; // Replace the extra separator.
510 return cp;
511 }
512
513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
514 char*
515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
516 char *cp;
517
518 assert(str != NULL, "just checking");
519 if (path == NULL) {
520 size_t len = strlen(str) + 1;
521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
522 memcpy(cp, str, len); // copy the trailing null
523 } else {
524 const char separator = *os::path_separator();
525 size_t old_len = strlen(path);
526 size_t str_len = strlen(str);
527 size_t len = old_len + str_len + 2;
528
529 if (prepend) {
530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
531 char* cp_tmp = cp;
532 memcpy(cp_tmp, str, str_len);
533 cp_tmp += str_len;
534 *cp_tmp = separator;
535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
536 FREE_C_HEAP_ARRAY(char, path, mtInternal);
537 } else {
538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
539 char* cp_tmp = cp + old_len;
540 *cp_tmp = separator;
541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
542 }
543 }
544 return cp;
545 }
546
547 // Scan the directory and append any jar or zip files found to path.
548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
550 DIR* dir = os::opendir(directory);
551 if (dir == NULL) return path;
552
553 char dir_sep[2] = { '\0', '\0' };
554 size_t directory_len = strlen(directory);
555 const char fileSep = *os::file_separator();
556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
557
558 /* Scan the directory for jars/zips, appending them to path. */
559 struct dirent *entry;
560 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
561 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
562 const char* name = entry->d_name;
563 const char* ext = name + strlen(name) - 4;
564 bool isJarOrZip = ext > name &&
565 (os::file_name_strcmp(ext, ".jar") == 0 ||
566 os::file_name_strcmp(ext, ".zip") == 0);
567 if (isJarOrZip) {
568 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
569 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
570 path = add_to_path(path, jarpath, false);
571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
572 }
573 }
574 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
575 os::closedir(dir);
576 return path;
577 }
578
579 // Parses a memory size specification string.
580 static bool atomull(const char *s, julong* result) {
581 julong n = 0;
582 int args_read = 0;
583 bool is_hex = false;
584 // Skip leading 0[xX] for hexadecimal
585 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
586 s += 2;
587 is_hex = true;
588 args_read = sscanf(s, JULONG_FORMAT_X, &n);
589 } else {
590 args_read = sscanf(s, JULONG_FORMAT, &n);
591 }
592 if (args_read != 1) {
593 return false;
594 }
595 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
596 s++;
597 }
598 // 4705540: illegal if more characters are found after the first non-digit
599 if (strlen(s) > 1) {
600 return false;
601 }
602 switch (*s) {
603 case 'T': case 't':
604 *result = n * G * K;
605 // Check for overflow.
606 if (*result/((julong)G * K) != n) return false;
607 return true;
608 case 'G': case 'g':
609 *result = n * G;
610 if (*result/G != n) return false;
611 return true;
612 case 'M': case 'm':
613 *result = n * M;
614 if (*result/M != n) return false;
615 return true;
616 case 'K': case 'k':
617 *result = n * K;
618 if (*result/K != n) return false;
619 return true;
620 case '\0':
621 *result = n;
622 return true;
623 default:
624 return false;
625 }
626 }
627
628 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
629 if (size < min_size) return arg_too_small;
630 // Check that size will fit in a size_t (only relevant on 32-bit)
631 if (size > max_uintx) return arg_too_big;
632 return arg_in_range;
633 }
634
635 // Describe an argument out of range error
636 void Arguments::describe_range_error(ArgsRange errcode) {
637 switch(errcode) {
638 case arg_too_big:
639 jio_fprintf(defaultStream::error_stream(),
640 "The specified size exceeds the maximum "
641 "representable size.\n");
642 break;
643 case arg_too_small:
644 case arg_unreadable:
645 case arg_in_range:
646 // do nothing for now
647 break;
648 default:
649 ShouldNotReachHere();
650 }
651 }
652
653 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
654 return CommandLineFlags::boolAtPut(name, &value, origin);
655 }
656
657 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
658 double v;
659 if (sscanf(value, "%lf", &v) != 1) {
660 return false;
661 }
662
663 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
664 return true;
665 }
666 return false;
667 }
668
669 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
670 julong v;
671 intx intx_v;
672 bool is_neg = false;
673 // Check the sign first since atomull() parses only unsigned values.
674 if (*value == '-') {
675 if (!CommandLineFlags::intxAt(name, &intx_v)) {
676 return false;
677 }
678 value++;
679 is_neg = true;
680 }
681 if (!atomull(value, &v)) {
682 return false;
683 }
684 intx_v = (intx) v;
685 if (is_neg) {
686 intx_v = -intx_v;
687 }
688 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
689 return true;
690 }
691 uintx uintx_v = (uintx) v;
692 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
693 return true;
694 }
695 uint64_t uint64_t_v = (uint64_t) v;
696 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
697 return true;
698 }
699 size_t size_t_v = (size_t) v;
700 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
701 return true;
702 }
703 return false;
704 }
705
706 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
707 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
708 // Contract: CommandLineFlags always returns a pointer that needs freeing.
709 FREE_C_HEAP_ARRAY(char, value, mtInternal);
710 return true;
711 }
712
713 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
714 const char* old_value = "";
715 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
716 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
717 size_t new_len = strlen(new_value);
718 const char* value;
719 char* free_this_too = NULL;
720 if (old_len == 0) {
721 value = new_value;
722 } else if (new_len == 0) {
723 value = old_value;
724 } else {
725 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
726 // each new setting adds another LINE to the switch:
727 sprintf(buf, "%s\n%s", old_value, new_value);
728 value = buf;
729 free_this_too = buf;
730 }
731 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
732 // CommandLineFlags always returns a pointer that needs freeing.
733 FREE_C_HEAP_ARRAY(char, value, mtInternal);
734 if (free_this_too != NULL) {
735 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
736 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
737 }
738 return true;
739 }
740
741 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
742
743 // range of acceptable characters spelled out for portability reasons
744 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
745 #define BUFLEN 255
746 char name[BUFLEN+1];
747 char dummy;
748
749 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
750 return set_bool_flag(name, false, origin);
751 }
752 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
753 return set_bool_flag(name, true, origin);
754 }
755
756 char punct;
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
758 const char* value = strchr(arg, '=') + 1;
759 Flag* flag = Flag::find_flag(name, strlen(name));
760 if (flag != NULL && flag->is_ccstr()) {
761 if (flag->ccstr_accumulates()) {
762 return append_to_string_flag(name, value, origin);
763 } else {
764 if (value[0] == '\0') {
765 value = NULL;
766 }
767 return set_string_flag(name, value, origin);
768 }
769 }
770 }
771
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
773 const char* value = strchr(arg, '=') + 1;
774 // -XX:Foo:=xxx will reset the string flag to the given value.
775 if (value[0] == '\0') {
776 value = NULL;
777 }
778 return set_string_flag(name, value, origin);
779 }
780
781 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
782 #define SIGNED_NUMBER_RANGE "[-0123456789]"
783 #define NUMBER_RANGE "[0123456789]"
784 char value[BUFLEN + 1];
785 char value2[BUFLEN + 1];
786 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
787 // Looks like a floating-point number -- try again with more lenient format string
788 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
789 return set_fp_numeric_flag(name, value, origin);
790 }
791 }
792
793 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
794 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
795 return set_numeric_flag(name, value, origin);
796 }
797
798 return false;
799 }
800
801 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
802 assert(bldarray != NULL, "illegal argument");
803
804 if (arg == NULL) {
805 return;
806 }
807
808 int new_count = *count + 1;
809
810 // expand the array and add arg to the last element
811 if (*bldarray == NULL) {
812 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
813 } else {
814 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
815 }
816 (*bldarray)[*count] = os::strdup_check_oom(arg);
817 *count = new_count;
818 }
819
820 void Arguments::build_jvm_args(const char* arg) {
821 add_string(&_jvm_args_array, &_num_jvm_args, arg);
822 }
823
824 void Arguments::build_jvm_flags(const char* arg) {
825 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
826 }
827
828 // utility function to return a string that concatenates all
829 // strings in a given char** array
830 const char* Arguments::build_resource_string(char** args, int count) {
831 if (args == NULL || count == 0) {
832 return NULL;
833 }
834 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
835 for (int i = 1; i < count; i++) {
836 length += strlen(args[i]) + 1; // add 1 for a space
837 }
838 char* s = NEW_RESOURCE_ARRAY(char, length);
839 strcpy(s, args[0]);
840 for (int j = 1; j < count; j++) {
841 strcat(s, " ");
842 strcat(s, args[j]);
843 }
844 return (const char*) s;
845 }
846
847 void Arguments::print_on(outputStream* st) {
848 st->print_cr("VM Arguments:");
849 if (num_jvm_flags() > 0) {
850 st->print("jvm_flags: "); print_jvm_flags_on(st);
851 }
852 if (num_jvm_args() > 0) {
853 st->print("jvm_args: "); print_jvm_args_on(st);
854 }
855 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
856 if (_java_class_path != NULL) {
857 char* path = _java_class_path->value();
858 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
859 }
860 st->print_cr("Launcher Type: %s", _sun_java_launcher);
861 }
862
863 void Arguments::print_jvm_flags_on(outputStream* st) {
864 if (_num_jvm_flags > 0) {
865 for (int i=0; i < _num_jvm_flags; i++) {
866 st->print("%s ", _jvm_flags_array[i]);
867 }
868 st->cr();
869 }
870 }
871
872 void Arguments::print_jvm_args_on(outputStream* st) {
873 if (_num_jvm_args > 0) {
874 for (int i=0; i < _num_jvm_args; i++) {
875 st->print("%s ", _jvm_args_array[i]);
876 }
877 st->cr();
878 }
879 }
880
881 bool Arguments::process_argument(const char* arg,
882 jboolean ignore_unrecognized, Flag::Flags origin) {
883
884 JDK_Version since = JDK_Version();
885
886 if (parse_argument(arg, origin) || ignore_unrecognized) {
887 return true;
888 }
889
890 bool has_plus_minus = (*arg == '+' || *arg == '-');
891 const char* const argname = has_plus_minus ? arg + 1 : arg;
892 if (is_newly_obsolete(arg, &since)) {
893 char version[256];
894 since.to_string(version, sizeof(version));
895 warning("ignoring option %s; support was removed in %s", argname, version);
896 return true;
897 }
898
899 // For locked flags, report a custom error message if available.
900 // Otherwise, report the standard unrecognized VM option.
901
902 size_t arg_len;
903 const char* equal_sign = strchr(argname, '=');
904 if (equal_sign == NULL) {
905 arg_len = strlen(argname);
906 } else {
907 arg_len = equal_sign - argname;
908 }
909
910 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
911 if (found_flag != NULL) {
912 char locked_message_buf[BUFLEN];
913 found_flag->get_locked_message(locked_message_buf, BUFLEN);
914 if (strlen(locked_message_buf) == 0) {
915 if (found_flag->is_bool() && !has_plus_minus) {
916 jio_fprintf(defaultStream::error_stream(),
917 "Missing +/- setting for VM option '%s'\n", argname);
918 } else if (!found_flag->is_bool() && has_plus_minus) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Unexpected +/- setting in VM option '%s'\n", argname);
921 } else {
922 jio_fprintf(defaultStream::error_stream(),
923 "Improperly specified VM option '%s'\n", argname);
924 }
925 } else {
926 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
927 }
928 } else {
929 jio_fprintf(defaultStream::error_stream(),
930 "Unrecognized VM option '%s'\n", argname);
931 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
932 if (fuzzy_matched != NULL) {
933 jio_fprintf(defaultStream::error_stream(),
934 "Did you mean '%s%s%s'?\n",
935 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
936 fuzzy_matched->_name,
937 (fuzzy_matched->is_bool()) ? "" : "=<value>");
938 }
939 }
940
941 // allow for commandline "commenting out" options like -XX:#+Verbose
942 return arg[0] == '#';
943 }
944
945 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
946 FILE* stream = fopen(file_name, "rb");
947 if (stream == NULL) {
948 if (should_exist) {
949 jio_fprintf(defaultStream::error_stream(),
950 "Could not open settings file %s\n", file_name);
951 return false;
952 } else {
953 return true;
954 }
955 }
956
957 char token[1024];
958 int pos = 0;
959
960 bool in_white_space = true;
961 bool in_comment = false;
962 bool in_quote = false;
963 char quote_c = 0;
964 bool result = true;
965
966 int c = getc(stream);
967 while(c != EOF && pos < (int)(sizeof(token)-1)) {
968 if (in_white_space) {
969 if (in_comment) {
970 if (c == '\n') in_comment = false;
971 } else {
972 if (c == '#') in_comment = true;
973 else if (!isspace(c)) {
974 in_white_space = false;
975 token[pos++] = c;
976 }
977 }
978 } else {
979 if (c == '\n' || (!in_quote && isspace(c))) {
980 // token ends at newline, or at unquoted whitespace
981 // this allows a way to include spaces in string-valued options
982 token[pos] = '\0';
983 logOption(token);
984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
985 build_jvm_flags(token);
986 pos = 0;
987 in_white_space = true;
988 in_quote = false;
989 } else if (!in_quote && (c == '\'' || c == '"')) {
990 in_quote = true;
991 quote_c = c;
992 } else if (in_quote && (c == quote_c)) {
993 in_quote = false;
994 } else {
995 token[pos++] = c;
996 }
997 }
998 c = getc(stream);
999 }
1000 if (pos > 0) {
1001 token[pos] = '\0';
1002 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1003 build_jvm_flags(token);
1004 }
1005 fclose(stream);
1006 return result;
1007 }
1008
1009 //=============================================================================================================
1010 // Parsing of properties (-D)
1011
1012 const char* Arguments::get_property(const char* key) {
1013 return PropertyList_get_value(system_properties(), key);
1014 }
1015
1016 bool Arguments::add_property(const char* prop) {
1017 const char* eq = strchr(prop, '=');
1018 char* key;
1019 // ns must be static--its address may be stored in a SystemProperty object.
1020 const static char ns[1] = {0};
1021 char* value = (char *)ns;
1022
1023 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1024 key = AllocateHeap(key_len + 1, mtInternal);
1025 strncpy(key, prop, key_len);
1026 key[key_len] = '\0';
1027
1028 if (eq != NULL) {
1029 size_t value_len = strlen(prop) - key_len - 1;
1030 value = AllocateHeap(value_len + 1, mtInternal);
1031 strncpy(value, &prop[key_len + 1], value_len + 1);
1032 }
1033
1034 if (strcmp(key, "java.compiler") == 0) {
1035 process_java_compiler_argument(value);
1036 FreeHeap(key);
1037 if (eq != NULL) {
1038 FreeHeap(value);
1039 }
1040 return true;
1041 } else if (strcmp(key, "sun.java.command") == 0) {
1042 _java_command = value;
1043
1044 // Record value in Arguments, but let it get passed to Java.
1045 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1046 strcmp(key, "sun.java.launcher.pid") == 0) {
1047 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1048 // private and are processed in process_sun_java_launcher_properties();
1049 // the sun.java.launcher property is passed on to the java application
1050 FreeHeap(key);
1051 if (eq != NULL) {
1052 FreeHeap(value);
1053 }
1054 return true;
1055 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1056 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1057 // its value without going through the property list or making a Java call.
1058 _java_vendor_url_bug = value;
1059 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1060 PropertyList_unique_add(&_system_properties, key, value, true);
1061 return true;
1062 }
1063 // Create new property and add at the end of the list
1064 PropertyList_unique_add(&_system_properties, key, value);
1065 return true;
1066 }
1067
1068 //===========================================================================================================
1069 // Setting int/mixed/comp mode flags
1070
1071 void Arguments::set_mode_flags(Mode mode) {
1072 // Set up default values for all flags.
1073 // If you add a flag to any of the branches below,
1074 // add a default value for it here.
1075 set_java_compiler(false);
1076 _mode = mode;
1077
1078 // Ensure Agent_OnLoad has the correct initial values.
1079 // This may not be the final mode; mode may change later in onload phase.
1080 PropertyList_unique_add(&_system_properties, "java.vm.info",
1081 (char*)VM_Version::vm_info_string(), false);
1082
1083 UseInterpreter = true;
1084 UseCompiler = true;
1085 UseLoopCounter = true;
1086
1087 // Default values may be platform/compiler dependent -
1088 // use the saved values
1089 ClipInlining = Arguments::_ClipInlining;
1090 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1091 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1092 BackgroundCompilation = Arguments::_BackgroundCompilation;
1093
1094 // Change from defaults based on mode
1095 switch (mode) {
1096 default:
1097 ShouldNotReachHere();
1098 break;
1099 case _int:
1100 UseCompiler = false;
1101 UseLoopCounter = false;
1102 AlwaysCompileLoopMethods = false;
1103 UseOnStackReplacement = false;
1104 break;
1105 case _mixed:
1106 // same as default
1107 break;
1108 case _comp:
1109 UseInterpreter = false;
1110 BackgroundCompilation = false;
1111 ClipInlining = false;
1112 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1113 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1114 // compile a level 4 (C2) and then continue executing it.
1115 if (TieredCompilation) {
1116 Tier3InvokeNotifyFreqLog = 0;
1117 Tier4InvocationThreshold = 0;
1118 }
1119 break;
1120 }
1121 }
1122
1123 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1124 // Conflict: required to use shared spaces (-Xshare:on), but
1125 // incompatible command line options were chosen.
1126
1127 static void no_shared_spaces(const char* message) {
1128 if (RequireSharedSpaces) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "Class data sharing is inconsistent with other specified options.\n");
1131 vm_exit_during_initialization("Unable to use shared archive.", message);
1132 } else {
1133 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1134 }
1135 }
1136 #endif
1137
1138 void Arguments::set_tiered_flags() {
1139 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1140 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1141 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1142 }
1143 if (CompilationPolicyChoice < 2) {
1144 vm_exit_during_initialization(
1145 "Incompatible compilation policy selected", NULL);
1146 }
1147 // Increase the code cache size - tiered compiles a lot more.
1148 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1149 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1150 }
1151 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1152 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1153 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1154
1155 // Multiply sizes by 5 but fix NonMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1156 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1157 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2);
1158 }
1159 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1160 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2);
1161 }
1162 // Check consistency of code heap sizes
1163 if ((NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1166 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1167 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1168 vm_exit(1);
1169 }
1170 }
1171 if (!UseInterpreter) { // -Xcomp
1172 Tier3InvokeNotifyFreqLog = 0;
1173 Tier4InvocationThreshold = 0;
1174 }
1175 }
1176
1177 /**
1178 * Returns the minimum number of compiler threads needed to run the JVM. The following
1179 * configurations are possible.
1180 *
1181 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1182 * compiler threads is 0.
1183 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1184 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1185 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1186 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1187 * C1 can be used, so the minimum number of compiler threads is 1.
1188 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1189 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1190 * the minimum number of compiler threads is 2.
1191 */
1192 int Arguments::get_min_number_of_compiler_threads() {
1193 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1194 return 0; // case 1
1195 #else
1196 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1197 return 1; // case 2 or case 3
1198 }
1199 return 2; // case 4 (tiered)
1200 #endif
1201 }
1202
1203 #if INCLUDE_ALL_GCS
1204 static void disable_adaptive_size_policy(const char* collector_name) {
1205 if (UseAdaptiveSizePolicy) {
1206 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1207 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1208 collector_name);
1209 }
1210 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1211 }
1212 }
1213
1214 void Arguments::set_parnew_gc_flags() {
1215 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1216 "control point invariant");
1217 assert(UseParNewGC, "Error");
1218
1219 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1220 disable_adaptive_size_policy("UseParNewGC");
1221
1222 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1223 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1224 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1225 } else if (ParallelGCThreads == 0) {
1226 jio_fprintf(defaultStream::error_stream(),
1227 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1228 vm_exit(1);
1229 }
1230
1231 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1232 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1233 // we set them to 1024 and 1024.
1234 // See CR 6362902.
1235 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1236 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1237 }
1238 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1239 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1240 }
1241
1242 // When using compressed oops, we use local overflow stacks,
1243 // rather than using a global overflow list chained through
1244 // the klass word of the object's pre-image.
1245 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1246 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1247 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1248 }
1249 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1250 }
1251 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1252 }
1253
1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1255 // sparc/solaris for certain applications, but would gain from
1256 // further optimization and tuning efforts, and would almost
1257 // certainly gain from analysis of platform and environment.
1258 void Arguments::set_cms_and_parnew_gc_flags() {
1259 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1260 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1261
1262 // If we are using CMS, we prefer to UseParNewGC,
1263 // unless explicitly forbidden.
1264 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1265 FLAG_SET_ERGO(bool, UseParNewGC, true);
1266 }
1267
1268 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1269 disable_adaptive_size_policy("UseConcMarkSweepGC");
1270
1271 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1272 // as needed.
1273 if (UseParNewGC) {
1274 set_parnew_gc_flags();
1275 }
1276
1277 size_t max_heap = align_size_down(MaxHeapSize,
1278 CardTableRS::ct_max_alignment_constraint());
1279
1280 // Now make adjustments for CMS
1281 intx tenuring_default = (intx)6;
1282 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1283
1284 // Preferred young gen size for "short" pauses:
1285 // upper bound depends on # of threads and NewRatio.
1286 const uintx parallel_gc_threads =
1287 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1288 const size_t preferred_max_new_size_unaligned =
1289 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1290 size_t preferred_max_new_size =
1291 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1292
1293 // Unless explicitly requested otherwise, size young gen
1294 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1295
1296 // If either MaxNewSize or NewRatio is set on the command line,
1297 // assume the user is trying to set the size of the young gen.
1298 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1299
1300 // Set MaxNewSize to our calculated preferred_max_new_size unless
1301 // NewSize was set on the command line and it is larger than
1302 // preferred_max_new_size.
1303 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1304 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1305 } else {
1306 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1307 }
1308 if (PrintGCDetails && Verbose) {
1309 // Too early to use gclog_or_tty
1310 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1311 }
1312
1313 // Code along this path potentially sets NewSize and OldSize
1314 if (PrintGCDetails && Verbose) {
1315 // Too early to use gclog_or_tty
1316 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1317 " initial_heap_size: " SIZE_FORMAT
1318 " max_heap: " SIZE_FORMAT,
1319 min_heap_size(), InitialHeapSize, max_heap);
1320 }
1321 size_t min_new = preferred_max_new_size;
1322 if (FLAG_IS_CMDLINE(NewSize)) {
1323 min_new = NewSize;
1324 }
1325 if (max_heap > min_new && min_heap_size() > min_new) {
1326 // Unless explicitly requested otherwise, make young gen
1327 // at least min_new, and at most preferred_max_new_size.
1328 if (FLAG_IS_DEFAULT(NewSize)) {
1329 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1330 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1331 if (PrintGCDetails && Verbose) {
1332 // Too early to use gclog_or_tty
1333 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1334 }
1335 }
1336 // Unless explicitly requested otherwise, size old gen
1337 // so it's NewRatio x of NewSize.
1338 if (FLAG_IS_DEFAULT(OldSize)) {
1339 if (max_heap > NewSize) {
1340 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1341 if (PrintGCDetails && Verbose) {
1342 // Too early to use gclog_or_tty
1343 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1344 }
1345 }
1346 }
1347 }
1348 }
1349 // Unless explicitly requested otherwise, definitely
1350 // promote all objects surviving "tenuring_default" scavenges.
1351 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1352 FLAG_IS_DEFAULT(SurvivorRatio)) {
1353 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1354 }
1355 // If we decided above (or user explicitly requested)
1356 // `promote all' (via MaxTenuringThreshold := 0),
1357 // prefer minuscule survivor spaces so as not to waste
1358 // space for (non-existent) survivors
1359 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1360 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1361 }
1362 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1363 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1364 // This is done in order to make ParNew+CMS configuration to work
1365 // with YoungPLABSize and OldPLABSize options.
1366 // See CR 6362902.
1367 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1370 // is. In this situation let CMSParPromoteBlocksToClaim follow
1371 // the value (either from the command line or ergonomics) of
1372 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1373 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1374 } else {
1375 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1376 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1377 // we'll let it to take precedence.
1378 jio_fprintf(defaultStream::error_stream(),
1379 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1380 " options are specified for the CMS collector."
1381 " CMSParPromoteBlocksToClaim will take precedence.\n");
1382 }
1383 }
1384 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1385 // OldPLAB sizing manually turned off: Use a larger default setting,
1386 // unless it was manually specified. This is because a too-low value
1387 // will slow down scavenges.
1388 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1389 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1390 }
1391 }
1392 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1393 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1394 // If either of the static initialization defaults have changed, note this
1395 // modification.
1396 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1397 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1398 }
1399 if (PrintGCDetails && Verbose) {
1400 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1401 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1402 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1403 }
1404 }
1405 #endif // INCLUDE_ALL_GCS
1406
1407 void set_object_alignment() {
1408 // Object alignment.
1409 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1410 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1411 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1412 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1413 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1414 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1415
1416 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1417 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1418
1419 // Oop encoding heap max
1420 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1421
1422 #if INCLUDE_ALL_GCS
1423 // Set CMS global values
1424 CompactibleFreeListSpace::set_cms_values();
1425 #endif // INCLUDE_ALL_GCS
1426 }
1427
1428 bool verify_object_alignment() {
1429 // Object alignment.
1430 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1431 jio_fprintf(defaultStream::error_stream(),
1432 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1433 (int)ObjectAlignmentInBytes);
1434 return false;
1435 }
1436 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1439 (int)ObjectAlignmentInBytes, BytesPerLong);
1440 return false;
1441 }
1442 // It does not make sense to have big object alignment
1443 // since a space lost due to alignment will be greater
1444 // then a saved space from compressed oops.
1445 if ((int)ObjectAlignmentInBytes > 256) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1448 (int)ObjectAlignmentInBytes);
1449 return false;
1450 }
1451 // In case page size is very small.
1452 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1453 jio_fprintf(defaultStream::error_stream(),
1454 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1455 (int)ObjectAlignmentInBytes, os::vm_page_size());
1456 return false;
1457 }
1458 if(SurvivorAlignmentInBytes == 0) {
1459 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1460 } else {
1461 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1462 jio_fprintf(defaultStream::error_stream(),
1463 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1464 (int)SurvivorAlignmentInBytes);
1465 return false;
1466 }
1467 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1468 jio_fprintf(defaultStream::error_stream(),
1469 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1470 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1471 return false;
1472 }
1473 }
1474 return true;
1475 }
1476
1477 size_t Arguments::max_heap_for_compressed_oops() {
1478 // Avoid sign flip.
1479 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1480 // We need to fit both the NULL page and the heap into the memory budget, while
1481 // keeping alignment constraints of the heap. To guarantee the latter, as the
1482 // NULL page is located before the heap, we pad the NULL page to the conservative
1483 // maximum alignment that the GC may ever impose upon the heap.
1484 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1485 _conservative_max_heap_alignment);
1486
1487 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1488 NOT_LP64(ShouldNotReachHere(); return 0);
1489 }
1490
1491 bool Arguments::should_auto_select_low_pause_collector() {
1492 if (UseAutoGCSelectPolicy &&
1493 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1494 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1495 if (PrintGCDetails) {
1496 // Cannot use gclog_or_tty yet.
1497 tty->print_cr("Automatic selection of the low pause collector"
1498 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1499 }
1500 return true;
1501 }
1502 return false;
1503 }
1504
1505 void Arguments::set_use_compressed_oops() {
1506 #ifndef ZERO
1507 #ifdef _LP64
1508 // MaxHeapSize is not set up properly at this point, but
1509 // the only value that can override MaxHeapSize if we are
1510 // to use UseCompressedOops is InitialHeapSize.
1511 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1512
1513 if (max_heap_size <= max_heap_for_compressed_oops()) {
1514 #if !defined(COMPILER1) || defined(TIERED)
1515 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1516 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1517 }
1518 #endif
1519 #ifdef _WIN64
1520 if (UseLargePages && UseCompressedOops) {
1521 // Cannot allocate guard pages for implicit checks in indexed addressing
1522 // mode, when large pages are specified on windows.
1523 // This flag could be switched ON if narrow oop base address is set to 0,
1524 // see code in Universe::initialize_heap().
1525 Universe::set_narrow_oop_use_implicit_null_checks(false);
1526 }
1527 #endif // _WIN64
1528 } else {
1529 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1530 warning("Max heap size too large for Compressed Oops");
1531 FLAG_SET_DEFAULT(UseCompressedOops, false);
1532 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1533 }
1534 }
1535 #endif // _LP64
1536 #endif // ZERO
1537 }
1538
1539
1540 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1541 // set_use_compressed_oops().
1542 void Arguments::set_use_compressed_klass_ptrs() {
1543 #ifndef ZERO
1544 #ifdef _LP64
1545 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1546 if (!UseCompressedOops) {
1547 if (UseCompressedClassPointers) {
1548 warning("UseCompressedClassPointers requires UseCompressedOops");
1549 }
1550 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1551 } else {
1552 // Turn on UseCompressedClassPointers too
1553 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1554 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1555 }
1556 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1557 if (UseCompressedClassPointers) {
1558 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1559 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1560 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1561 }
1562 }
1563 }
1564 #endif // _LP64
1565 #endif // !ZERO
1566 }
1567
1568 void Arguments::set_conservative_max_heap_alignment() {
1569 // The conservative maximum required alignment for the heap is the maximum of
1570 // the alignments imposed by several sources: any requirements from the heap
1571 // itself, the collector policy and the maximum page size we may run the VM
1572 // with.
1573 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1574 #if INCLUDE_ALL_GCS
1575 if (UseParallelGC) {
1576 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1577 } else if (UseG1GC) {
1578 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1579 }
1580 #endif // INCLUDE_ALL_GCS
1581 _conservative_max_heap_alignment = MAX4(heap_alignment,
1582 (size_t)os::vm_allocation_granularity(),
1583 os::max_page_size(),
1584 CollectorPolicy::compute_heap_alignment());
1585 }
1586
1587 void Arguments::select_gc_ergonomically() {
1588 if (os::is_server_class_machine()) {
1589 if (should_auto_select_low_pause_collector()) {
1590 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1591 } else {
1592 FLAG_SET_ERGO(bool, UseParallelGC, true);
1593 }
1594 }
1595 }
1596
1597 void Arguments::select_gc() {
1598 if (!gc_selected()) {
1599 ArgumentsExt::select_gc_ergonomically();
1600 }
1601 }
1602
1603 void Arguments::set_ergonomics_flags() {
1604 select_gc();
1605
1606 #ifdef COMPILER2
1607 // Shared spaces work fine with other GCs but causes bytecode rewriting
1608 // to be disabled, which hurts interpreter performance and decreases
1609 // server performance. When -server is specified, keep the default off
1610 // unless it is asked for. Future work: either add bytecode rewriting
1611 // at link time, or rewrite bytecodes in non-shared methods.
1612 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1613 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1614 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1615 }
1616 #endif
1617
1618 set_conservative_max_heap_alignment();
1619
1620 #ifndef ZERO
1621 #ifdef _LP64
1622 set_use_compressed_oops();
1623
1624 // set_use_compressed_klass_ptrs() must be called after calling
1625 // set_use_compressed_oops().
1626 set_use_compressed_klass_ptrs();
1627
1628 // Also checks that certain machines are slower with compressed oops
1629 // in vm_version initialization code.
1630 #endif // _LP64
1631 #endif // !ZERO
1632 }
1633
1634 void Arguments::set_parallel_gc_flags() {
1635 assert(UseParallelGC || UseParallelOldGC, "Error");
1636 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1637 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1638 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1639 }
1640 FLAG_SET_DEFAULT(UseParallelGC, true);
1641
1642 // If no heap maximum was requested explicitly, use some reasonable fraction
1643 // of the physical memory, up to a maximum of 1GB.
1644 FLAG_SET_DEFAULT(ParallelGCThreads,
1645 Abstract_VM_Version::parallel_worker_threads());
1646 if (ParallelGCThreads == 0) {
1647 jio_fprintf(defaultStream::error_stream(),
1648 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1649 vm_exit(1);
1650 }
1651
1652 if (UseAdaptiveSizePolicy) {
1653 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1654 // unless the user actually sets these flags.
1655 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1656 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1657 _min_heap_free_ratio = MinHeapFreeRatio;
1658 }
1659 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1660 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1661 _max_heap_free_ratio = MaxHeapFreeRatio;
1662 }
1663 }
1664
1665 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1666 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1667 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1668 // See CR 6362902 for details.
1669 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1670 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1671 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1672 }
1673 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1674 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1675 }
1676 }
1677
1678 if (UseParallelOldGC) {
1679 // Par compact uses lower default values since they are treated as
1680 // minimums. These are different defaults because of the different
1681 // interpretation and are not ergonomically set.
1682 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1683 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1684 }
1685 }
1686 }
1687
1688 void Arguments::set_g1_gc_flags() {
1689 assert(UseG1GC, "Error");
1690 #ifdef COMPILER1
1691 FastTLABRefill = false;
1692 #endif
1693 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1694 if (ParallelGCThreads == 0) {
1695 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1696 vm_exit_during_initialization("The G1 GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1697 }
1698
1699 #if INCLUDE_ALL_GCS
1700 if (G1ConcRefinementThreads == 0) {
1701 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1702 }
1703 #endif
1704
1705 // MarkStackSize will be set (if it hasn't been set by the user)
1706 // when concurrent marking is initialized.
1707 // Its value will be based upon the number of parallel marking threads.
1708 // But we do set the maximum mark stack size here.
1709 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1710 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1711 }
1712
1713 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1714 // In G1, we want the default GC overhead goal to be higher than
1715 // say in PS. So we set it here to 10%. Otherwise the heap might
1716 // be expanded more aggressively than we would like it to. In
1717 // fact, even 10% seems to not be high enough in some cases
1718 // (especially small GC stress tests that the main thing they do
1719 // is allocation). We might consider increase it further.
1720 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1721 }
1722
1723 if (PrintGCDetails && Verbose) {
1724 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1725 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1726 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1727 }
1728 }
1729
1730 #if !INCLUDE_ALL_GCS
1731 #ifdef ASSERT
1732 static bool verify_serial_gc_flags() {
1733 return (UseSerialGC &&
1734 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1735 UseParallelGC || UseParallelOldGC));
1736 }
1737 #endif // ASSERT
1738 #endif // INCLUDE_ALL_GCS
1739
1740 void Arguments::set_gc_specific_flags() {
1741 #if INCLUDE_ALL_GCS
1742 // Set per-collector flags
1743 if (UseParallelGC || UseParallelOldGC) {
1744 set_parallel_gc_flags();
1745 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1746 set_cms_and_parnew_gc_flags();
1747 } else if (UseParNewGC) { // Skipped if CMS is set above
1748 set_parnew_gc_flags();
1749 } else if (UseG1GC) {
1750 set_g1_gc_flags();
1751 }
1752 check_deprecated_gcs();
1753 check_deprecated_gc_flags();
1754 if (AssumeMP && !UseSerialGC) {
1755 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1756 warning("If the number of processors is expected to increase from one, then"
1757 " you should configure the number of parallel GC threads appropriately"
1758 " using -XX:ParallelGCThreads=N");
1759 }
1760 }
1761 if (MinHeapFreeRatio == 100) {
1762 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1763 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1764 }
1765 #else // INCLUDE_ALL_GCS
1766 assert(verify_serial_gc_flags(), "SerialGC unset");
1767 #endif // INCLUDE_ALL_GCS
1768 }
1769
1770 julong Arguments::limit_by_allocatable_memory(julong limit) {
1771 julong max_allocatable;
1772 julong result = limit;
1773 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1774 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1775 }
1776 return result;
1777 }
1778
1779 // Use static initialization to get the default before parsing
1780 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1781
1782 void Arguments::set_heap_size() {
1783 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1784 // Deprecated flag
1785 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1786 }
1787
1788 const julong phys_mem =
1789 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1790 : (julong)MaxRAM;
1791
1792 // If the maximum heap size has not been set with -Xmx,
1793 // then set it as fraction of the size of physical memory,
1794 // respecting the maximum and minimum sizes of the heap.
1795 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1796 julong reasonable_max = phys_mem / MaxRAMFraction;
1797
1798 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1799 // Small physical memory, so use a minimum fraction of it for the heap
1800 reasonable_max = phys_mem / MinRAMFraction;
1801 } else {
1802 // Not-small physical memory, so require a heap at least
1803 // as large as MaxHeapSize
1804 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1805 }
1806 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1807 // Limit the heap size to ErgoHeapSizeLimit
1808 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1809 }
1810 if (UseCompressedOops) {
1811 // Limit the heap size to the maximum possible when using compressed oops
1812 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1813
1814 // HeapBaseMinAddress can be greater than default but not less than.
1815 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1816 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1817 // matches compressed oops printing flags
1818 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1819 jio_fprintf(defaultStream::error_stream(),
1820 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1821 " (" UINTX_FORMAT "G) which is greater than value given "
1822 UINTX_FORMAT "\n",
1823 DefaultHeapBaseMinAddress,
1824 DefaultHeapBaseMinAddress/G,
1825 HeapBaseMinAddress);
1826 }
1827 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1828 }
1829 }
1830
1831 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1832 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1833 // but it should be not less than default MaxHeapSize.
1834 max_coop_heap -= HeapBaseMinAddress;
1835 }
1836 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1837 }
1838 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1839
1840 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1841 // An initial heap size was specified on the command line,
1842 // so be sure that the maximum size is consistent. Done
1843 // after call to limit_by_allocatable_memory because that
1844 // method might reduce the allocation size.
1845 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1846 }
1847
1848 if (PrintGCDetails && Verbose) {
1849 // Cannot use gclog_or_tty yet.
1850 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1851 }
1852 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1853 }
1854
1855 // If the minimum or initial heap_size have not been set or requested to be set
1856 // ergonomically, set them accordingly.
1857 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1858 julong reasonable_minimum = (julong)(OldSize + NewSize);
1859
1860 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1861
1862 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1863
1864 if (InitialHeapSize == 0) {
1865 julong reasonable_initial = phys_mem / InitialRAMFraction;
1866
1867 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1868 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1869
1870 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1871
1872 if (PrintGCDetails && Verbose) {
1873 // Cannot use gclog_or_tty yet.
1874 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1875 }
1876 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1877 }
1878 // If the minimum heap size has not been set (via -Xms),
1879 // synchronize with InitialHeapSize to avoid errors with the default value.
1880 if (min_heap_size() == 0) {
1881 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1882 if (PrintGCDetails && Verbose) {
1883 // Cannot use gclog_or_tty yet.
1884 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1885 }
1886 }
1887 }
1888 }
1889
1890 // This must be called after ergonomics because we want bytecode rewriting
1891 // if the server compiler is used, or if UseSharedSpaces is disabled.
1892 void Arguments::set_bytecode_flags() {
1893 // Better not attempt to store into a read-only space.
1894 if (UseSharedSpaces) {
1895 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1896 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1897 }
1898
1899 if (!RewriteBytecodes) {
1900 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1901 }
1902 }
1903
1904 // Aggressive optimization flags -XX:+AggressiveOpts
1905 void Arguments::set_aggressive_opts_flags() {
1906 #ifdef COMPILER2
1907 if (AggressiveUnboxing) {
1908 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1909 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1910 } else if (!EliminateAutoBox) {
1911 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1912 AggressiveUnboxing = false;
1913 }
1914 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1915 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1916 } else if (!DoEscapeAnalysis) {
1917 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1918 AggressiveUnboxing = false;
1919 }
1920 }
1921 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1922 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1923 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1924 }
1925 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1926 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1927 }
1928
1929 // Feed the cache size setting into the JDK
1930 char buffer[1024];
1931 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1932 add_property(buffer);
1933 }
1934 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1935 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1936 }
1937 #endif
1938
1939 if (AggressiveOpts) {
1940 // Sample flag setting code
1941 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1942 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1943 // }
1944 }
1945 }
1946
1947 //===========================================================================================================
1948 // Parsing of java.compiler property
1949
1950 void Arguments::process_java_compiler_argument(char* arg) {
1951 // For backwards compatibility, Djava.compiler=NONE or ""
1952 // causes us to switch to -Xint mode UNLESS -Xdebug
1953 // is also specified.
1954 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1955 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1956 }
1957 }
1958
1959 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1960 _sun_java_launcher = os::strdup_check_oom(launcher);
1961 }
1962
1963 bool Arguments::created_by_java_launcher() {
1964 assert(_sun_java_launcher != NULL, "property must have value");
1965 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1966 }
1967
1968 bool Arguments::sun_java_launcher_is_altjvm() {
1969 return _sun_java_launcher_is_altjvm;
1970 }
1971
1972 //===========================================================================================================
1973 // Parsing of main arguments
1974
1975 bool Arguments::verify_interval(uintx val, uintx min,
1976 uintx max, const char* name) {
1977 // Returns true iff value is in the inclusive interval [min..max]
1978 // false, otherwise.
1979 if (val >= min && val <= max) {
1980 return true;
1981 }
1982 jio_fprintf(defaultStream::error_stream(),
1983 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1984 " and " UINTX_FORMAT "\n",
1985 name, val, min, max);
1986 return false;
1987 }
1988
1989 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1990 // Returns true if given value is at least specified min threshold
1991 // false, otherwise.
1992 if (val >= min ) {
1993 return true;
1994 }
1995 jio_fprintf(defaultStream::error_stream(),
1996 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1997 name, val, min);
1998 return false;
1999 }
2000
2001 bool Arguments::verify_percentage(uintx value, const char* name) {
2002 if (is_percentage(value)) {
2003 return true;
2004 }
2005 jio_fprintf(defaultStream::error_stream(),
2006 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2007 name, value);
2008 return false;
2009 }
2010
2011 // check if do gclog rotation
2012 // +UseGCLogFileRotation is a must,
2013 // no gc log rotation when log file not supplied or
2014 // NumberOfGCLogFiles is 0
2015 void check_gclog_consistency() {
2016 if (UseGCLogFileRotation) {
2017 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2018 jio_fprintf(defaultStream::output_stream(),
2019 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2020 "where num_of_file > 0\n"
2021 "GC log rotation is turned off\n");
2022 UseGCLogFileRotation = false;
2023 }
2024 }
2025
2026 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2027 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2028 jio_fprintf(defaultStream::output_stream(),
2029 "GCLogFileSize changed to minimum 8K\n");
2030 }
2031 }
2032
2033 // This function is called for -Xloggc:<filename>, it can be used
2034 // to check if a given file name(or string) conforms to the following
2035 // specification:
2036 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2037 // %p and %t only allowed once. We only limit usage of filename not path
2038 bool is_filename_valid(const char *file_name) {
2039 const char* p = file_name;
2040 char file_sep = os::file_separator()[0];
2041 const char* cp;
2042 // skip prefix path
2043 for (cp = file_name; *cp != '\0'; cp++) {
2044 if (*cp == '/' || *cp == file_sep) {
2045 p = cp + 1;
2046 }
2047 }
2048
2049 int count_p = 0;
2050 int count_t = 0;
2051 while (*p != '\0') {
2052 if ((*p >= '0' && *p <= '9') ||
2053 (*p >= 'A' && *p <= 'Z') ||
2054 (*p >= 'a' && *p <= 'z') ||
2055 *p == '-' ||
2056 *p == '_' ||
2057 *p == '.') {
2058 p++;
2059 continue;
2060 }
2061 if (*p == '%') {
2062 if(*(p + 1) == 'p') {
2063 p += 2;
2064 count_p ++;
2065 continue;
2066 }
2067 if (*(p + 1) == 't') {
2068 p += 2;
2069 count_t ++;
2070 continue;
2071 }
2072 }
2073 return false;
2074 }
2075 return count_p < 2 && count_t < 2;
2076 }
2077
2078 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2079 if (!is_percentage(min_heap_free_ratio)) {
2080 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2081 return false;
2082 }
2083 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2084 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2085 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2086 MaxHeapFreeRatio);
2087 return false;
2088 }
2089 // This does not set the flag itself, but stores the value in a safe place for later usage.
2090 _min_heap_free_ratio = min_heap_free_ratio;
2091 return true;
2092 }
2093
2094 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2095 if (!is_percentage(max_heap_free_ratio)) {
2096 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2097 return false;
2098 }
2099 if (max_heap_free_ratio < MinHeapFreeRatio) {
2100 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2101 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2102 MinHeapFreeRatio);
2103 return false;
2104 }
2105 // This does not set the flag itself, but stores the value in a safe place for later usage.
2106 _max_heap_free_ratio = max_heap_free_ratio;
2107 return true;
2108 }
2109
2110 // Check consistency of GC selection
2111 bool Arguments::check_gc_consistency_user() {
2112 check_gclog_consistency();
2113 bool status = true;
2114 // Ensure that the user has not selected conflicting sets
2115 // of collectors. [Note: this check is merely a user convenience;
2116 // collectors over-ride each other so that only a non-conflicting
2117 // set is selected; however what the user gets is not what they
2118 // may have expected from the combination they asked for. It's
2119 // better to reduce user confusion by not allowing them to
2120 // select conflicting combinations.
2121 uint i = 0;
2122 if (UseSerialGC) i++;
2123 if (UseConcMarkSweepGC || UseParNewGC) i++;
2124 if (UseParallelGC || UseParallelOldGC) i++;
2125 if (UseG1GC) i++;
2126 if (i > 1) {
2127 jio_fprintf(defaultStream::error_stream(),
2128 "Conflicting collector combinations in option list; "
2129 "please refer to the release notes for the combinations "
2130 "allowed\n");
2131 status = false;
2132 }
2133 return status;
2134 }
2135
2136 void Arguments::check_deprecated_gcs() {
2137 if (UseConcMarkSweepGC && !UseParNewGC) {
2138 warning("Using the DefNew young collector with the CMS collector is deprecated "
2139 "and will likely be removed in a future release");
2140 }
2141
2142 if (UseParNewGC && !UseConcMarkSweepGC) {
2143 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2144 // set up UseSerialGC properly, so that can't be used in the check here.
2145 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2146 "and will likely be removed in a future release");
2147 }
2148
2149 if (CMSIncrementalMode) {
2150 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2151 }
2152 }
2153
2154 void Arguments::check_deprecated_gc_flags() {
2155 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2156 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2157 "and will likely be removed in future release");
2158 }
2159 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2160 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2161 "Use MaxRAMFraction instead.");
2162 }
2163 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2164 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2165 }
2166 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2167 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2168 }
2169 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2170 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2171 }
2172 }
2173
2174 // Check stack pages settings
2175 bool Arguments::check_stack_pages()
2176 {
2177 bool status = true;
2178 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2179 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2180 // greater stack shadow pages can't generate instruction to bang stack
2181 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2182 return status;
2183 }
2184
2185 // Check the consistency of vm_init_args
2186 bool Arguments::check_vm_args_consistency() {
2187 // Method for adding checks for flag consistency.
2188 // The intent is to warn the user of all possible conflicts,
2189 // before returning an error.
2190 // Note: Needs platform-dependent factoring.
2191 bool status = true;
2192
2193 if (TLABRefillWasteFraction == 0) {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "TLABRefillWasteFraction should be a denominator, "
2196 "not " SIZE_FORMAT "\n",
2197 TLABRefillWasteFraction);
2198 status = false;
2199 }
2200
2201 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2202 "AdaptiveSizePolicyWeight");
2203 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2204
2205 // Divide by bucket size to prevent a large size from causing rollover when
2206 // calculating amount of memory needed to be allocated for the String table.
2207 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2208 (max_uintx / StringTable::bucket_size()), "StringTable size");
2209
2210 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2211 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2212
2213 {
2214 // Using "else if" below to avoid printing two error messages if min > max.
2215 // This will also prevent us from reporting both min>100 and max>100 at the
2216 // same time, but that is less annoying than printing two identical errors IMHO.
2217 FormatBuffer<80> err_msg("%s","");
2218 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2219 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2220 status = false;
2221 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2222 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2223 status = false;
2224 }
2225 }
2226
2227 // Min/MaxMetaspaceFreeRatio
2228 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2229 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2230
2231 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2232 jio_fprintf(defaultStream::error_stream(),
2233 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2234 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2235 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2236 MinMetaspaceFreeRatio,
2237 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2238 MaxMetaspaceFreeRatio);
2239 status = false;
2240 }
2241
2242 // Trying to keep 100% free is not practical
2243 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2244
2245 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2246 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2247 }
2248
2249 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2250 // Settings to encourage splitting.
2251 if (!FLAG_IS_CMDLINE(NewRatio)) {
2252 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2253 }
2254 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2255 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2256 }
2257 }
2258
2259 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2260 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2261 }
2262
2263 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2264 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2265 if (GCTimeLimit == 100) {
2266 // Turn off gc-overhead-limit-exceeded checks
2267 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2268 }
2269
2270 status = status && ArgumentsExt::check_gc_consistency_user();
2271 status = status && check_stack_pages();
2272
2273 if (CMSIncrementalMode) {
2274 if (!UseConcMarkSweepGC) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "error: invalid argument combination.\n"
2277 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2278 "selected in order\nto use CMSIncrementalMode.\n");
2279 status = false;
2280 } else {
2281 status = status && verify_percentage(CMSIncrementalDutyCycle,
2282 "CMSIncrementalDutyCycle");
2283 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2284 "CMSIncrementalDutyCycleMin");
2285 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2286 "CMSIncrementalSafetyFactor");
2287 status = status && verify_percentage(CMSIncrementalOffset,
2288 "CMSIncrementalOffset");
2289 status = status && verify_percentage(CMSExpAvgFactor,
2290 "CMSExpAvgFactor");
2291 // If it was not set on the command line, set
2292 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2293 if (CMSInitiatingOccupancyFraction < 0) {
2294 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2295 }
2296 }
2297 }
2298
2299 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2300 // insists that we hold the requisite locks so that the iteration is
2301 // MT-safe. For the verification at start-up and shut-down, we don't
2302 // yet have a good way of acquiring and releasing these locks,
2303 // which are not visible at the CollectedHeap level. We want to
2304 // be able to acquire these locks and then do the iteration rather
2305 // than just disable the lock verification. This will be fixed under
2306 // bug 4788986.
2307 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2308 if (VerifyDuringStartup) {
2309 warning("Heap verification at start-up disabled "
2310 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2311 VerifyDuringStartup = false; // Disable verification at start-up
2312 }
2313
2314 if (VerifyBeforeExit) {
2315 warning("Heap verification at shutdown disabled "
2316 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2317 VerifyBeforeExit = false; // Disable verification at shutdown
2318 }
2319 }
2320
2321 // Note: only executed in non-PRODUCT mode
2322 if (!UseAsyncConcMarkSweepGC &&
2323 (ExplicitGCInvokesConcurrent ||
2324 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2325 jio_fprintf(defaultStream::error_stream(),
2326 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2327 " with -UseAsyncConcMarkSweepGC");
2328 status = false;
2329 }
2330
2331 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2332
2333 #if INCLUDE_ALL_GCS
2334 if (UseG1GC) {
2335 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2336 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2337 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2338
2339 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2340 "InitiatingHeapOccupancyPercent");
2341 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2342 "G1RefProcDrainInterval");
2343 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2344 "G1ConcMarkStepDurationMillis");
2345 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2346 "G1ConcRSHotCardLimit");
2347 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2348 "G1ConcRSLogCacheSize");
2349 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2350 "StringDeduplicationAgeThreshold");
2351 }
2352 if (UseConcMarkSweepGC) {
2353 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2354 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2355 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2356 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2357
2358 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2359
2360 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2361 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2362 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2363
2364 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2365
2366 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2367 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2368
2369 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2370 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2371 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2372
2373 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2374
2375 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2376
2377 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2378 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2379 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2380 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2381 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2382 }
2383
2384 if (UseParallelGC || UseParallelOldGC) {
2385 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2386 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2387
2388 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2389 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2390
2391 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2392 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2393
2394 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2395
2396 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2397 }
2398 #endif // INCLUDE_ALL_GCS
2399
2400 status = status && verify_interval(RefDiscoveryPolicy,
2401 ReferenceProcessor::DiscoveryPolicyMin,
2402 ReferenceProcessor::DiscoveryPolicyMax,
2403 "RefDiscoveryPolicy");
2404
2405 // Limit the lower bound of this flag to 1 as it is used in a division
2406 // expression.
2407 status = status && verify_interval(TLABWasteTargetPercent,
2408 1, 100, "TLABWasteTargetPercent");
2409
2410 status = status && verify_object_alignment();
2411
2412 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2413 "CompressedClassSpaceSize");
2414
2415 status = status && verify_interval(MarkStackSizeMax,
2416 1, (max_jint - 1), "MarkStackSizeMax");
2417 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2418
2419 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2420
2421 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2422
2423 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2424
2425 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2426 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2427
2428 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2429
2430 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2431 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2432 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2433 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2434
2435 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2436 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2437
2438 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2439 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2440 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2441
2442 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2443 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2444
2445 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2446 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2447 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2448 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2449
2450 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2451 #ifdef COMPILER1
2452 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2453 #endif
2454
2455 if (PrintNMTStatistics) {
2456 #if INCLUDE_NMT
2457 if (MemTracker::tracking_level() == NMT_off) {
2458 #endif // INCLUDE_NMT
2459 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2460 PrintNMTStatistics = false;
2461 #if INCLUDE_NMT
2462 }
2463 #endif
2464 }
2465
2466 // Need to limit the extent of the padding to reasonable size.
2467 // 8K is well beyond the reasonable HW cache line size, even with the
2468 // aggressive prefetching, while still leaving the room for segregating
2469 // among the distinct pages.
2470 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2471 jio_fprintf(defaultStream::error_stream(),
2472 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2473 ContendedPaddingWidth, 0, 8192);
2474 status = false;
2475 }
2476
2477 // Need to enforce the padding not to break the existing field alignments.
2478 // It is sufficient to check against the largest type size.
2479 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2482 ContendedPaddingWidth, BytesPerLong);
2483 status = false;
2484 }
2485
2486 // Check lower bounds of the code cache
2487 // Template Interpreter code is approximately 3X larger in debug builds.
2488 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2489 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2490 jio_fprintf(defaultStream::error_stream(),
2491 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2492 os::vm_page_size()/K);
2493 status = false;
2494 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2495 jio_fprintf(defaultStream::error_stream(),
2496 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2497 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2498 status = false;
2499 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2500 jio_fprintf(defaultStream::error_stream(),
2501 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2502 min_code_cache_size/K);
2503 status = false;
2504 } else if (ReservedCodeCacheSize > 2*G) {
2505 // Code cache size larger than MAXINT is not supported.
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2508 (2*G)/M);
2509 status = false;
2510 } else if (NonMethodCodeHeapSize < min_code_cache_size){
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Invalid NonMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonMethodCodeHeapSize/K,
2513 min_code_cache_size/K);
2514 status = false;
2515 } else if ((!FLAG_IS_DEFAULT(NonMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2516 && (NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2517 jio_fprintf(defaultStream::error_stream(),
2518 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2519 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2520 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2521 status = false;
2522 }
2523
2524 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2525 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2526 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2527 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2528
2529 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2530 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2531 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2532 // Check the minimum number of compiler threads
2533 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2534
2535 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2536 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2537 }
2538
2539 return status;
2540 }
2541
2542 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2543 const char* option_type) {
2544 if (ignore) return false;
2545
2546 const char* spacer = " ";
2547 if (option_type == NULL) {
2548 option_type = ++spacer; // Set both to the empty string.
2549 }
2550
2551 if (os::obsolete_option(option)) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Obsolete %s%soption: %s\n", option_type, spacer,
2554 option->optionString);
2555 return false;
2556 } else {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Unrecognized %s%soption: %s\n", option_type, spacer,
2559 option->optionString);
2560 return true;
2561 }
2562 }
2563
2564 static const char* user_assertion_options[] = {
2565 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2566 };
2567
2568 static const char* system_assertion_options[] = {
2569 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2570 };
2571
2572 // Return true if any of the strings in null-terminated array 'names' matches.
2573 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2574 // the option must match exactly.
2575 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2576 bool tail_allowed) {
2577 for (/* empty */; *names != NULL; ++names) {
2578 if (match_option(option, *names, tail)) {
2579 if (**tail == '\0' || tail_allowed && **tail == ':') {
2580 return true;
2581 }
2582 }
2583 }
2584 return false;
2585 }
2586
2587 bool Arguments::parse_uintx(const char* value,
2588 uintx* uintx_arg,
2589 uintx min_size) {
2590
2591 // Check the sign first since atomull() parses only unsigned values.
2592 bool value_is_positive = !(*value == '-');
2593
2594 if (value_is_positive) {
2595 julong n;
2596 bool good_return = atomull(value, &n);
2597 if (good_return) {
2598 bool above_minimum = n >= min_size;
2599 bool value_is_too_large = n > max_uintx;
2600
2601 if (above_minimum && !value_is_too_large) {
2602 *uintx_arg = n;
2603 return true;
2604 }
2605 }
2606 }
2607 return false;
2608 }
2609
2610 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2611 julong* long_arg,
2612 julong min_size) {
2613 if (!atomull(s, long_arg)) return arg_unreadable;
2614 return check_memory_size(*long_arg, min_size);
2615 }
2616
2617 // Parse JavaVMInitArgs structure
2618
2619 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2620 // For components of the system classpath.
2621 SysClassPath scp(Arguments::get_sysclasspath());
2622 bool scp_assembly_required = false;
2623
2624 // Save default settings for some mode flags
2625 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2626 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2627 Arguments::_ClipInlining = ClipInlining;
2628 Arguments::_BackgroundCompilation = BackgroundCompilation;
2629
2630 // Setup flags for mixed which is the default
2631 set_mode_flags(_mixed);
2632
2633 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2634 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2635 if (result != JNI_OK) {
2636 return result;
2637 }
2638
2639 // Parse JavaVMInitArgs structure passed in
2640 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2641 if (result != JNI_OK) {
2642 return result;
2643 }
2644
2645 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2646 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2647 if (result != JNI_OK) {
2648 return result;
2649 }
2650
2651 // Do final processing now that all arguments have been parsed
2652 result = finalize_vm_init_args(&scp, scp_assembly_required);
2653 if (result != JNI_OK) {
2654 return result;
2655 }
2656
2657 return JNI_OK;
2658 }
2659
2660 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2661 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2662 // are dealing with -agentpath (case where name is a path), otherwise with
2663 // -agentlib
2664 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2665 char *_name;
2666 const char *_hprof = "hprof", *_jdwp = "jdwp";
2667 size_t _len_hprof, _len_jdwp, _len_prefix;
2668
2669 if (is_path) {
2670 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2671 return false;
2672 }
2673
2674 _name++; // skip past last path separator
2675 _len_prefix = strlen(JNI_LIB_PREFIX);
2676
2677 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2678 return false;
2679 }
2680
2681 _name += _len_prefix;
2682 _len_hprof = strlen(_hprof);
2683 _len_jdwp = strlen(_jdwp);
2684
2685 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2686 _name += _len_hprof;
2687 }
2688 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2689 _name += _len_jdwp;
2690 }
2691 else {
2692 return false;
2693 }
2694
2695 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2696 return false;
2697 }
2698
2699 return true;
2700 }
2701
2702 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2703 return true;
2704 }
2705
2706 return false;
2707 }
2708
2709 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2710 SysClassPath* scp_p,
2711 bool* scp_assembly_required_p,
2712 Flag::Flags origin) {
2713 // Remaining part of option string
2714 const char* tail;
2715
2716 // iterate over arguments
2717 for (int index = 0; index < args->nOptions; index++) {
2718 bool is_absolute_path = false; // for -agentpath vs -agentlib
2719
2720 const JavaVMOption* option = args->options + index;
2721
2722 if (!match_option(option, "-Djava.class.path", &tail) &&
2723 !match_option(option, "-Dsun.java.command", &tail) &&
2724 !match_option(option, "-Dsun.java.launcher", &tail)) {
2725
2726 // add all jvm options to the jvm_args string. This string
2727 // is used later to set the java.vm.args PerfData string constant.
2728 // the -Djava.class.path and the -Dsun.java.command options are
2729 // omitted from jvm_args string as each have their own PerfData
2730 // string constant object.
2731 build_jvm_args(option->optionString);
2732 }
2733
2734 // -verbose:[class/gc/jni]
2735 if (match_option(option, "-verbose", &tail)) {
2736 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2737 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2738 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2739 } else if (!strcmp(tail, ":gc")) {
2740 FLAG_SET_CMDLINE(bool, PrintGC, true);
2741 } else if (!strcmp(tail, ":jni")) {
2742 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2743 }
2744 // -da / -ea / -disableassertions / -enableassertions
2745 // These accept an optional class/package name separated by a colon, e.g.,
2746 // -da:java.lang.Thread.
2747 } else if (match_option(option, user_assertion_options, &tail, true)) {
2748 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2749 if (*tail == '\0') {
2750 JavaAssertions::setUserClassDefault(enable);
2751 } else {
2752 assert(*tail == ':', "bogus match by match_option()");
2753 JavaAssertions::addOption(tail + 1, enable);
2754 }
2755 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2756 } else if (match_option(option, system_assertion_options, &tail, false)) {
2757 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2758 JavaAssertions::setSystemClassDefault(enable);
2759 // -bootclasspath:
2760 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2761 scp_p->reset_path(tail);
2762 *scp_assembly_required_p = true;
2763 // -bootclasspath/a:
2764 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2765 scp_p->add_suffix(tail);
2766 *scp_assembly_required_p = true;
2767 // -bootclasspath/p:
2768 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2769 scp_p->add_prefix(tail);
2770 *scp_assembly_required_p = true;
2771 // -Xrun
2772 } else if (match_option(option, "-Xrun", &tail)) {
2773 if (tail != NULL) {
2774 const char* pos = strchr(tail, ':');
2775 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2776 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2777 name[len] = '\0';
2778
2779 char *options = NULL;
2780 if(pos != NULL) {
2781 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2782 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2783 }
2784 #if !INCLUDE_JVMTI
2785 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Profiling and debugging agents are not supported in this VM\n");
2788 return JNI_ERR;
2789 }
2790 #endif // !INCLUDE_JVMTI
2791 add_init_library(name, options);
2792 }
2793 // -agentlib and -agentpath
2794 } else if (match_option(option, "-agentlib:", &tail) ||
2795 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2796 if(tail != NULL) {
2797 const char* pos = strchr(tail, '=');
2798 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2799 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2800 name[len] = '\0';
2801
2802 char *options = NULL;
2803 if(pos != NULL) {
2804 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2805 }
2806 #if !INCLUDE_JVMTI
2807 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Profiling and debugging agents are not supported in this VM\n");
2810 return JNI_ERR;
2811 }
2812 #endif // !INCLUDE_JVMTI
2813 add_init_agent(name, options, is_absolute_path);
2814 }
2815 // -javaagent
2816 } else if (match_option(option, "-javaagent:", &tail)) {
2817 #if !INCLUDE_JVMTI
2818 jio_fprintf(defaultStream::error_stream(),
2819 "Instrumentation agents are not supported in this VM\n");
2820 return JNI_ERR;
2821 #else
2822 if(tail != NULL) {
2823 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2824 add_init_agent("instrument", options, false);
2825 }
2826 #endif // !INCLUDE_JVMTI
2827 // -Xnoclassgc
2828 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2829 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2830 // -Xincgc: i-CMS
2831 } else if (match_option(option, "-Xincgc", &tail)) {
2832 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2833 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2834 // -Xnoincgc: no i-CMS
2835 } else if (match_option(option, "-Xnoincgc", &tail)) {
2836 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2837 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2838 // -Xconcgc
2839 } else if (match_option(option, "-Xconcgc", &tail)) {
2840 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2841 // -Xnoconcgc
2842 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2843 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2844 // -Xbatch
2845 } else if (match_option(option, "-Xbatch", &tail)) {
2846 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2847 // -Xmn for compatibility with other JVM vendors
2848 } else if (match_option(option, "-Xmn", &tail)) {
2849 julong long_initial_young_size = 0;
2850 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2851 if (errcode != arg_in_range) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Invalid initial young generation size: %s\n", option->optionString);
2854 describe_range_error(errcode);
2855 return JNI_EINVAL;
2856 }
2857 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2858 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2859 // -Xms
2860 } else if (match_option(option, "-Xms", &tail)) {
2861 julong long_initial_heap_size = 0;
2862 // an initial heap size of 0 means automatically determine
2863 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2864 if (errcode != arg_in_range) {
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Invalid initial heap size: %s\n", option->optionString);
2867 describe_range_error(errcode);
2868 return JNI_EINVAL;
2869 }
2870 set_min_heap_size((uintx)long_initial_heap_size);
2871 // Currently the minimum size and the initial heap sizes are the same.
2872 // Can be overridden with -XX:InitialHeapSize.
2873 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2874 // -Xmx
2875 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2876 julong long_max_heap_size = 0;
2877 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2878 if (errcode != arg_in_range) {
2879 jio_fprintf(defaultStream::error_stream(),
2880 "Invalid maximum heap size: %s\n", option->optionString);
2881 describe_range_error(errcode);
2882 return JNI_EINVAL;
2883 }
2884 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2885 // Xmaxf
2886 } else if (match_option(option, "-Xmaxf", &tail)) {
2887 char* err;
2888 int maxf = (int)(strtod(tail, &err) * 100);
2889 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Bad max heap free percentage size: %s\n",
2892 option->optionString);
2893 return JNI_EINVAL;
2894 } else {
2895 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2896 }
2897 // Xminf
2898 } else if (match_option(option, "-Xminf", &tail)) {
2899 char* err;
2900 int minf = (int)(strtod(tail, &err) * 100);
2901 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Bad min heap free percentage size: %s\n",
2904 option->optionString);
2905 return JNI_EINVAL;
2906 } else {
2907 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2908 }
2909 // -Xss
2910 } else if (match_option(option, "-Xss", &tail)) {
2911 julong long_ThreadStackSize = 0;
2912 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2913 if (errcode != arg_in_range) {
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Invalid thread stack size: %s\n", option->optionString);
2916 describe_range_error(errcode);
2917 return JNI_EINVAL;
2918 }
2919 // Internally track ThreadStackSize in units of 1024 bytes.
2920 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2921 round_to((int)long_ThreadStackSize, K) / K);
2922 // -Xoss
2923 } else if (match_option(option, "-Xoss", &tail)) {
2924 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2925 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2926 julong long_CodeCacheExpansionSize = 0;
2927 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2931 os::vm_page_size()/K);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2935 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2936 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2937 julong long_ReservedCodeCacheSize = 0;
2938
2939 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid maximum code cache size: %s.\n", option->optionString);
2943 return JNI_EINVAL;
2944 }
2945 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2946 // -XX:NonMethodCodeHeapSize=
2947 } else if (match_option(option, "-XX:NonMethodCodeHeapSize=", &tail)) {
2948 julong long_NonMethodCodeHeapSize = 0;
2949
2950 ArgsRange errcode = parse_memory_size(tail, &long_NonMethodCodeHeapSize, 1);
2951 if (errcode != arg_in_range) {
2952 jio_fprintf(defaultStream::error_stream(),
2953 "Invalid maximum non-method code heap size: %s.\n", option->optionString);
2954 return JNI_EINVAL;
2955 }
2956 FLAG_SET_CMDLINE(uintx, NonMethodCodeHeapSize, (uintx)long_NonMethodCodeHeapSize);
2957 // -XX:ProfiledCodeHeapSize=
2958 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2959 julong long_ProfiledCodeHeapSize = 0;
2960
2961 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2962 if (errcode != arg_in_range) {
2963 jio_fprintf(defaultStream::error_stream(),
2964 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2965 return JNI_EINVAL;
2966 }
2967 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2968 // -XX:NonProfiledCodeHeapSizee=
2969 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2970 julong long_NonProfiledCodeHeapSize = 0;
2971
2972 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2973 if (errcode != arg_in_range) {
2974 jio_fprintf(defaultStream::error_stream(),
2975 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2976 return JNI_EINVAL;
2977 }
2978 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2979 //-XX:IncreaseFirstTierCompileThresholdAt=
2980 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2981 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2982 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2985 option->optionString);
2986 return JNI_EINVAL;
2987 }
2988 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2989 // -green
2990 } else if (match_option(option, "-green", &tail)) {
2991 jio_fprintf(defaultStream::error_stream(),
2992 "Green threads support not available\n");
2993 return JNI_EINVAL;
2994 // -native
2995 } else if (match_option(option, "-native", &tail)) {
2996 // HotSpot always uses native threads, ignore silently for compatibility
2997 // -Xsqnopause
2998 } else if (match_option(option, "-Xsqnopause", &tail)) {
2999 // EVM option, ignore silently for compatibility
3000 // -Xrs
3001 } else if (match_option(option, "-Xrs", &tail)) {
3002 // Classic/EVM option, new functionality
3003 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3004 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3005 // change default internal VM signals used - lower case for back compat
3006 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3007 // -Xoptimize
3008 } else if (match_option(option, "-Xoptimize", &tail)) {
3009 // EVM option, ignore silently for compatibility
3010 // -Xprof
3011 } else if (match_option(option, "-Xprof", &tail)) {
3012 #if INCLUDE_FPROF
3013 _has_profile = true;
3014 #else // INCLUDE_FPROF
3015 jio_fprintf(defaultStream::error_stream(),
3016 "Flat profiling is not supported in this VM.\n");
3017 return JNI_ERR;
3018 #endif // INCLUDE_FPROF
3019 // -Xconcurrentio
3020 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3021 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3022 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3023 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3024 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3025 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3026
3027 // -Xinternalversion
3028 } else if (match_option(option, "-Xinternalversion", &tail)) {
3029 jio_fprintf(defaultStream::output_stream(), "%s\n",
3030 VM_Version::internal_vm_info_string());
3031 vm_exit(0);
3032 #ifndef PRODUCT
3033 // -Xprintflags
3034 } else if (match_option(option, "-Xprintflags", &tail)) {
3035 CommandLineFlags::printFlags(tty, false);
3036 vm_exit(0);
3037 #endif
3038 // -D
3039 } else if (match_option(option, "-D", &tail)) {
3040 if (!add_property(tail)) {
3041 return JNI_ENOMEM;
3042 }
3043 // Out of the box management support
3044 if (match_option(option, "-Dcom.sun.management", &tail)) {
3045 #if INCLUDE_MANAGEMENT
3046 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3047 #else
3048 jio_fprintf(defaultStream::output_stream(),
3049 "-Dcom.sun.management is not supported in this VM.\n");
3050 return JNI_ERR;
3051 #endif
3052 }
3053 // -Xint
3054 } else if (match_option(option, "-Xint", &tail)) {
3055 set_mode_flags(_int);
3056 // -Xmixed
3057 } else if (match_option(option, "-Xmixed", &tail)) {
3058 set_mode_flags(_mixed);
3059 // -Xcomp
3060 } else if (match_option(option, "-Xcomp", &tail)) {
3061 // for testing the compiler; turn off all flags that inhibit compilation
3062 set_mode_flags(_comp);
3063 // -Xshare:dump
3064 } else if (match_option(option, "-Xshare:dump", &tail)) {
3065 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3066 set_mode_flags(_int); // Prevent compilation, which creates objects
3067 // -Xshare:on
3068 } else if (match_option(option, "-Xshare:on", &tail)) {
3069 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3070 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3071 // -Xshare:auto
3072 } else if (match_option(option, "-Xshare:auto", &tail)) {
3073 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3074 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3075 // -Xshare:off
3076 } else if (match_option(option, "-Xshare:off", &tail)) {
3077 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3078 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3079 // -Xverify
3080 } else if (match_option(option, "-Xverify", &tail)) {
3081 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3082 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3083 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3084 } else if (strcmp(tail, ":remote") == 0) {
3085 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3086 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3087 } else if (strcmp(tail, ":none") == 0) {
3088 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3089 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3090 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3091 return JNI_EINVAL;
3092 }
3093 // -Xdebug
3094 } else if (match_option(option, "-Xdebug", &tail)) {
3095 // note this flag has been used, then ignore
3096 set_xdebug_mode(true);
3097 // -Xnoagent
3098 } else if (match_option(option, "-Xnoagent", &tail)) {
3099 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3100 } else if (match_option(option, "-Xboundthreads", &tail)) {
3101 // Bind user level threads to kernel threads (Solaris only)
3102 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3103 } else if (match_option(option, "-Xloggc:", &tail)) {
3104 // Redirect GC output to the file. -Xloggc:<filename>
3105 // ostream_init_log(), when called will use this filename
3106 // to initialize a fileStream.
3107 _gc_log_filename = os::strdup_check_oom(tail);
3108 if (!is_filename_valid(_gc_log_filename)) {
3109 jio_fprintf(defaultStream::output_stream(),
3110 "Invalid file name for use with -Xloggc: Filename can only contain the "
3111 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3112 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3113 return JNI_EINVAL;
3114 }
3115 FLAG_SET_CMDLINE(bool, PrintGC, true);
3116 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3117
3118 // JNI hooks
3119 } else if (match_option(option, "-Xcheck", &tail)) {
3120 if (!strcmp(tail, ":jni")) {
3121 #if !INCLUDE_JNI_CHECK
3122 warning("JNI CHECKING is not supported in this VM");
3123 #else
3124 CheckJNICalls = true;
3125 #endif // INCLUDE_JNI_CHECK
3126 } else if (is_bad_option(option, args->ignoreUnrecognized,
3127 "check")) {
3128 return JNI_EINVAL;
3129 }
3130 } else if (match_option(option, "vfprintf", &tail)) {
3131 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3132 } else if (match_option(option, "exit", &tail)) {
3133 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3134 } else if (match_option(option, "abort", &tail)) {
3135 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3136 // -XX:+AggressiveHeap
3137 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3138
3139 // This option inspects the machine and attempts to set various
3140 // parameters to be optimal for long-running, memory allocation
3141 // intensive jobs. It is intended for machines with large
3142 // amounts of cpu and memory.
3143
3144 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3145 // VM, but we may not be able to represent the total physical memory
3146 // available (like having 8gb of memory on a box but using a 32bit VM).
3147 // Thus, we need to make sure we're using a julong for intermediate
3148 // calculations.
3149 julong initHeapSize;
3150 julong total_memory = os::physical_memory();
3151
3152 if (total_memory < (julong)256*M) {
3153 jio_fprintf(defaultStream::error_stream(),
3154 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3155 vm_exit(1);
3156 }
3157
3158 // The heap size is half of available memory, or (at most)
3159 // all of possible memory less 160mb (leaving room for the OS
3160 // when using ISM). This is the maximum; because adaptive sizing
3161 // is turned on below, the actual space used may be smaller.
3162
3163 initHeapSize = MIN2(total_memory / (julong)2,
3164 total_memory - (julong)160*M);
3165
3166 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3167
3168 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3169 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3170 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3171 // Currently the minimum size and the initial heap sizes are the same.
3172 set_min_heap_size(initHeapSize);
3173 }
3174 if (FLAG_IS_DEFAULT(NewSize)) {
3175 // Make the young generation 3/8ths of the total heap.
3176 FLAG_SET_CMDLINE(uintx, NewSize,
3177 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3178 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3179 }
3180
3181 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3182 FLAG_SET_DEFAULT(UseLargePages, true);
3183 #endif
3184
3185 // Increase some data structure sizes for efficiency
3186 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3187 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3188 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3189
3190 // See the OldPLABSize comment below, but replace 'after promotion'
3191 // with 'after copying'. YoungPLABSize is the size of the survivor
3192 // space per-gc-thread buffers. The default is 4kw.
3193 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3194
3195 // OldPLABSize is the size of the buffers in the old gen that
3196 // UseParallelGC uses to promote live data that doesn't fit in the
3197 // survivor spaces. At any given time, there's one for each gc thread.
3198 // The default size is 1kw. These buffers are rarely used, since the
3199 // survivor spaces are usually big enough. For specjbb, however, there
3200 // are occasions when there's lots of live data in the young gen
3201 // and we end up promoting some of it. We don't have a definite
3202 // explanation for why bumping OldPLABSize helps, but the theory
3203 // is that a bigger PLAB results in retaining something like the
3204 // original allocation order after promotion, which improves mutator
3205 // locality. A minor effect may be that larger PLABs reduce the
3206 // number of PLAB allocation events during gc. The value of 8kw
3207 // was arrived at by experimenting with specjbb.
3208 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3209
3210 // Enable parallel GC and adaptive generation sizing
3211 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3212 FLAG_SET_DEFAULT(ParallelGCThreads,
3213 Abstract_VM_Version::parallel_worker_threads());
3214
3215 // Encourage steady state memory management
3216 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3217
3218 // This appears to improve mutator locality
3219 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3220
3221 // Get around early Solaris scheduling bug
3222 // (affinity vs other jobs on system)
3223 // but disallow DR and offlining (5008695).
3224 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3225
3226 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3227 // and the last option wins.
3228 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3229 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3230 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3231 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3232 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3233 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3234 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3235 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3236 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3237 uintx max_tenuring_thresh = 0;
3238 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3239 jio_fprintf(defaultStream::error_stream(),
3240 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3241 }
3242 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3243
3244 if (MaxTenuringThreshold == 0) {
3245 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3246 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3247 } else {
3248 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3249 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3250 }
3251 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3252 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3253 jio_fprintf(defaultStream::error_stream(),
3254 "Please use CMSClassUnloadingEnabled in place of "
3255 "CMSPermGenSweepingEnabled in the future\n");
3256 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3257 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Please use -XX:+UseGCOverheadLimit in place of "
3260 "-XX:+UseGCTimeLimit in the future\n");
3261 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3262 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3263 jio_fprintf(defaultStream::error_stream(),
3264 "Please use -XX:-UseGCOverheadLimit in place of "
3265 "-XX:-UseGCTimeLimit in the future\n");
3266 // The TLE options are for compatibility with 1.3 and will be
3267 // removed without notice in a future release. These options
3268 // are not to be documented.
3269 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3270 // No longer used.
3271 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3272 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3273 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3274 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3275 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3276 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3277 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3278 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3279 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3280 // No longer used.
3281 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3282 julong long_tlab_size = 0;
3283 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3284 if (errcode != arg_in_range) {
3285 jio_fprintf(defaultStream::error_stream(),
3286 "Invalid TLAB size: %s\n", option->optionString);
3287 describe_range_error(errcode);
3288 return JNI_EINVAL;
3289 }
3290 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3291 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3292 // No longer used.
3293 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3294 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3295 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3296 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3297 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3298 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3299 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3300 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3301 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3302 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3303 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3304 #if defined(DTRACE_ENABLED)
3305 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3306 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3307 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3308 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3309 #else // defined(DTRACE_ENABLED)
3310 jio_fprintf(defaultStream::error_stream(),
3311 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3312 return JNI_EINVAL;
3313 #endif // defined(DTRACE_ENABLED)
3314 #ifdef ASSERT
3315 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3316 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3317 // disable scavenge before parallel mark-compact
3318 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3319 #endif
3320 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3321 julong cms_blocks_to_claim = (julong)atol(tail);
3322 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3323 jio_fprintf(defaultStream::error_stream(),
3324 "Please use -XX:OldPLABSize in place of "
3325 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3326 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3327 julong cms_blocks_to_claim = (julong)atol(tail);
3328 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3329 jio_fprintf(defaultStream::error_stream(),
3330 "Please use -XX:OldPLABSize in place of "
3331 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3332 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3333 julong old_plab_size = 0;
3334 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3335 if (errcode != arg_in_range) {
3336 jio_fprintf(defaultStream::error_stream(),
3337 "Invalid old PLAB size: %s\n", option->optionString);
3338 describe_range_error(errcode);
3339 return JNI_EINVAL;
3340 }
3341 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3342 jio_fprintf(defaultStream::error_stream(),
3343 "Please use -XX:OldPLABSize in place of "
3344 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3345 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3346 julong young_plab_size = 0;
3347 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3348 if (errcode != arg_in_range) {
3349 jio_fprintf(defaultStream::error_stream(),
3350 "Invalid young PLAB size: %s\n", option->optionString);
3351 describe_range_error(errcode);
3352 return JNI_EINVAL;
3353 }
3354 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Please use -XX:YoungPLABSize in place of "
3357 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3358 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3359 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3360 julong stack_size = 0;
3361 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3362 if (errcode != arg_in_range) {
3363 jio_fprintf(defaultStream::error_stream(),
3364 "Invalid mark stack size: %s\n", option->optionString);
3365 describe_range_error(errcode);
3366 return JNI_EINVAL;
3367 }
3368 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3369 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3370 julong max_stack_size = 0;
3371 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3372 if (errcode != arg_in_range) {
3373 jio_fprintf(defaultStream::error_stream(),
3374 "Invalid maximum mark stack size: %s\n",
3375 option->optionString);
3376 describe_range_error(errcode);
3377 return JNI_EINVAL;
3378 }
3379 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3380 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3381 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3382 uintx conc_threads = 0;
3383 if (!parse_uintx(tail, &conc_threads, 1)) {
3384 jio_fprintf(defaultStream::error_stream(),
3385 "Invalid concurrent threads: %s\n", option->optionString);
3386 return JNI_EINVAL;
3387 }
3388 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3389 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3390 julong max_direct_memory_size = 0;
3391 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3392 if (errcode != arg_in_range) {
3393 jio_fprintf(defaultStream::error_stream(),
3394 "Invalid maximum direct memory size: %s\n",
3395 option->optionString);
3396 describe_range_error(errcode);
3397 return JNI_EINVAL;
3398 }
3399 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3400 #if !INCLUDE_MANAGEMENT
3401 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "ManagementServer is not supported in this VM.\n");
3404 return JNI_ERR;
3405 #endif // INCLUDE_MANAGEMENT
3406 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3407 // Skip -XX:Flags= since that case has already been handled
3408 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3409 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3410 return JNI_EINVAL;
3411 }
3412 }
3413 // Unknown option
3414 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3415 return JNI_ERR;
3416 }
3417 }
3418
3419 // PrintSharedArchiveAndExit will turn on
3420 // -Xshare:on
3421 // -XX:+TraceClassPaths
3422 if (PrintSharedArchiveAndExit) {
3423 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3424 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3425 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3426 }
3427
3428 // Change the default value for flags which have different default values
3429 // when working with older JDKs.
3430 #ifdef LINUX
3431 if (JDK_Version::current().compare_major(6) <= 0 &&
3432 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3433 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3434 }
3435 #endif // LINUX
3436 fix_appclasspath();
3437 return JNI_OK;
3438 }
3439
3440 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3441 //
3442 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3443 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3444 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3445 // path is treated as the current directory.
3446 //
3447 // This causes problems with CDS, which requires that all directories specified in the classpath
3448 // must be empty. In most cases, applications do NOT want to load classes from the current
3449 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3450 // scripts compatible with CDS.
3451 void Arguments::fix_appclasspath() {
3452 if (IgnoreEmptyClassPaths) {
3453 const char separator = *os::path_separator();
3454 const char* src = _java_class_path->value();
3455
3456 // skip over all the leading empty paths
3457 while (*src == separator) {
3458 src ++;
3459 }
3460
3461 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3462 strncpy(copy, src, strlen(src) + 1);
3463
3464 // trim all trailing empty paths
3465 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3466 *tail = '\0';
3467 }
3468
3469 char from[3] = {separator, separator, '\0'};
3470 char to [2] = {separator, '\0'};
3471 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3472 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3473 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3474 }
3475
3476 _java_class_path->set_value(copy);
3477 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3478 }
3479
3480 if (!PrintSharedArchiveAndExit) {
3481 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3482 }
3483 }
3484
3485 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3486 // This must be done after all -D arguments have been processed.
3487 scp_p->expand_endorsed();
3488
3489 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3490 // Assemble the bootclasspath elements into the final path.
3491 Arguments::set_sysclasspath(scp_p->combined_path());
3492 }
3493
3494 // This must be done after all arguments have been processed.
3495 // java_compiler() true means set to "NONE" or empty.
3496 if (java_compiler() && !xdebug_mode()) {
3497 // For backwards compatibility, we switch to interpreted mode if
3498 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3499 // not specified.
3500 set_mode_flags(_int);
3501 }
3502 if (CompileThreshold == 0) {
3503 set_mode_flags(_int);
3504 }
3505
3506 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3507 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3508 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3509 }
3510
3511 #ifndef COMPILER2
3512 // Don't degrade server performance for footprint
3513 if (FLAG_IS_DEFAULT(UseLargePages) &&
3514 MaxHeapSize < LargePageHeapSizeThreshold) {
3515 // No need for large granularity pages w/small heaps.
3516 // Note that large pages are enabled/disabled for both the
3517 // Java heap and the code cache.
3518 FLAG_SET_DEFAULT(UseLargePages, false);
3519 }
3520
3521 #else
3522 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3523 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3524 }
3525 #endif
3526
3527 #ifndef TIERED
3528 // Tiered compilation is undefined.
3529 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3530 #endif
3531
3532 // If we are running in a headless jre, force java.awt.headless property
3533 // to be true unless the property has already been set.
3534 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3535 if (os::is_headless_jre()) {
3536 const char* headless = Arguments::get_property("java.awt.headless");
3537 if (headless == NULL) {
3538 char envbuffer[128];
3539 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3540 if (!add_property("java.awt.headless=true")) {
3541 return JNI_ENOMEM;
3542 }
3543 } else {
3544 char buffer[256];
3545 strcpy(buffer, "java.awt.headless=");
3546 strcat(buffer, envbuffer);
3547 if (!add_property(buffer)) {
3548 return JNI_ENOMEM;
3549 }
3550 }
3551 }
3552 }
3553
3554 if (!ArgumentsExt::check_vm_args_consistency()) {
3555 return JNI_ERR;
3556 }
3557
3558 return JNI_OK;
3559 }
3560
3561 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3562 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3563 scp_assembly_required_p);
3564 }
3565
3566 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3567 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3568 scp_assembly_required_p);
3569 }
3570
3571 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3572 const int N_MAX_OPTIONS = 64;
3573 const int OPTION_BUFFER_SIZE = 1024;
3574 char buffer[OPTION_BUFFER_SIZE];
3575
3576 // The variable will be ignored if it exceeds the length of the buffer.
3577 // Don't check this variable if user has special privileges
3578 // (e.g. unix su command).
3579 if (os::getenv(name, buffer, sizeof(buffer)) &&
3580 !os::have_special_privileges()) {
3581 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3582 jio_fprintf(defaultStream::error_stream(),
3583 "Picked up %s: %s\n", name, buffer);
3584 char* rd = buffer; // pointer to the input string (rd)
3585 int i;
3586 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3587 while (isspace(*rd)) rd++; // skip whitespace
3588 if (*rd == 0) break; // we re done when the input string is read completely
3589
3590 // The output, option string, overwrites the input string.
3591 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3592 // input string (rd).
3593 char* wrt = rd;
3594
3595 options[i++].optionString = wrt; // Fill in option
3596 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3597 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3598 int quote = *rd; // matching quote to look for
3599 rd++; // don't copy open quote
3600 while (*rd != quote) { // include everything (even spaces) up until quote
3601 if (*rd == 0) { // string termination means unmatched string
3602 jio_fprintf(defaultStream::error_stream(),
3603 "Unmatched quote in %s\n", name);
3604 return JNI_ERR;
3605 }
3606 *wrt++ = *rd++; // copy to option string
3607 }
3608 rd++; // don't copy close quote
3609 } else {
3610 *wrt++ = *rd++; // copy to option string
3611 }
3612 }
3613 // Need to check if we're done before writing a NULL,
3614 // because the write could be to the byte that rd is pointing to.
3615 if (*rd++ == 0) {
3616 *wrt = 0;
3617 break;
3618 }
3619 *wrt = 0; // Zero terminate option
3620 }
3621 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3622 JavaVMInitArgs vm_args;
3623 vm_args.version = JNI_VERSION_1_2;
3624 vm_args.options = options;
3625 vm_args.nOptions = i;
3626 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3627
3628 if (PrintVMOptions) {
3629 const char* tail;
3630 for (int i = 0; i < vm_args.nOptions; i++) {
3631 const JavaVMOption *option = vm_args.options + i;
3632 if (match_option(option, "-XX:", &tail)) {
3633 logOption(tail);
3634 }
3635 }
3636 }
3637
3638 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3639 }
3640 return JNI_OK;
3641 }
3642
3643 void Arguments::set_shared_spaces_flags() {
3644 if (DumpSharedSpaces) {
3645 if (RequireSharedSpaces) {
3646 warning("cannot dump shared archive while using shared archive");
3647 }
3648 UseSharedSpaces = false;
3649 #ifdef _LP64
3650 if (!UseCompressedOops || !UseCompressedClassPointers) {
3651 vm_exit_during_initialization(
3652 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3653 }
3654 } else {
3655 if (!UseCompressedOops || !UseCompressedClassPointers) {
3656 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3657 }
3658 #endif
3659 }
3660 }
3661
3662 #if !INCLUDE_ALL_GCS
3663 static void force_serial_gc() {
3664 FLAG_SET_DEFAULT(UseSerialGC, true);
3665 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3666 UNSUPPORTED_GC_OPTION(UseG1GC);
3667 UNSUPPORTED_GC_OPTION(UseParallelGC);
3668 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3669 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3670 UNSUPPORTED_GC_OPTION(UseParNewGC);
3671 }
3672 #endif // INCLUDE_ALL_GCS
3673
3674 // Sharing support
3675 // Construct the path to the archive
3676 static char* get_shared_archive_path() {
3677 char *shared_archive_path;
3678 if (SharedArchiveFile == NULL) {
3679 char jvm_path[JVM_MAXPATHLEN];
3680 os::jvm_path(jvm_path, sizeof(jvm_path));
3681 char *end = strrchr(jvm_path, *os::file_separator());
3682 if (end != NULL) *end = '\0';
3683 size_t jvm_path_len = strlen(jvm_path);
3684 size_t file_sep_len = strlen(os::file_separator());
3685 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3686 file_sep_len + 20, mtInternal);
3687 if (shared_archive_path != NULL) {
3688 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3689 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3690 strncat(shared_archive_path, "classes.jsa", 11);
3691 }
3692 } else {
3693 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3694 if (shared_archive_path != NULL) {
3695 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3696 }
3697 }
3698 return shared_archive_path;
3699 }
3700
3701 #ifndef PRODUCT
3702 // Determine whether LogVMOutput should be implicitly turned on.
3703 static bool use_vm_log() {
3704 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3705 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3706 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3707 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3708 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3709 return true;
3710 }
3711
3712 #ifdef COMPILER1
3713 if (PrintC1Statistics) {
3714 return true;
3715 }
3716 #endif // COMPILER1
3717
3718 #ifdef COMPILER2
3719 if (PrintOptoAssembly || PrintOptoStatistics) {
3720 return true;
3721 }
3722 #endif // COMPILER2
3723
3724 return false;
3725 }
3726 #endif // PRODUCT
3727
3728 // Parse entry point called from JNI_CreateJavaVM
3729
3730 jint Arguments::parse(const JavaVMInitArgs* args) {
3731
3732 // Remaining part of option string
3733 const char* tail;
3734
3735 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3736 const char* hotspotrc = ".hotspotrc";
3737 bool settings_file_specified = false;
3738 bool needs_hotspotrc_warning = false;
3739
3740 const char* flags_file;
3741 int index;
3742 for (index = 0; index < args->nOptions; index++) {
3743 const JavaVMOption *option = args->options + index;
3744 if (match_option(option, "-XX:Flags=", &tail)) {
3745 flags_file = tail;
3746 settings_file_specified = true;
3747 }
3748 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3749 PrintVMOptions = true;
3750 }
3751 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3752 PrintVMOptions = false;
3753 }
3754 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3755 IgnoreUnrecognizedVMOptions = true;
3756 }
3757 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3758 IgnoreUnrecognizedVMOptions = false;
3759 }
3760 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3761 CommandLineFlags::printFlags(tty, false);
3762 vm_exit(0);
3763 }
3764 #if INCLUDE_NMT
3765 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3766 // The launcher did not setup nmt environment variable properly.
3767 if (!MemTracker::check_launcher_nmt_support(tail)) {
3768 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3769 }
3770
3771 // Verify if nmt option is valid.
3772 if (MemTracker::verify_nmt_option()) {
3773 // Late initialization, still in single-threaded mode.
3774 if (MemTracker::tracking_level() >= NMT_summary) {
3775 MemTracker::init();
3776 }
3777 } else {
3778 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3779 }
3780 }
3781 #endif
3782
3783
3784 #ifndef PRODUCT
3785 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3786 CommandLineFlags::printFlags(tty, true);
3787 vm_exit(0);
3788 }
3789 #endif
3790 }
3791
3792 if (IgnoreUnrecognizedVMOptions) {
3793 // uncast const to modify the flag args->ignoreUnrecognized
3794 *(jboolean*)(&args->ignoreUnrecognized) = true;
3795 }
3796
3797 // Parse specified settings file
3798 if (settings_file_specified) {
3799 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3800 return JNI_EINVAL;
3801 }
3802 } else {
3803 #ifdef ASSERT
3804 // Parse default .hotspotrc settings file
3805 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3806 return JNI_EINVAL;
3807 }
3808 #else
3809 struct stat buf;
3810 if (os::stat(hotspotrc, &buf) == 0) {
3811 needs_hotspotrc_warning = true;
3812 }
3813 #endif
3814 }
3815
3816 if (PrintVMOptions) {
3817 for (index = 0; index < args->nOptions; index++) {
3818 const JavaVMOption *option = args->options + index;
3819 if (match_option(option, "-XX:", &tail)) {
3820 logOption(tail);
3821 }
3822 }
3823 }
3824
3825 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3826 jint result = parse_vm_init_args(args);
3827 if (result != JNI_OK) {
3828 return result;
3829 }
3830
3831 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3832 SharedArchivePath = get_shared_archive_path();
3833 if (SharedArchivePath == NULL) {
3834 return JNI_ENOMEM;
3835 }
3836
3837 // Delay warning until here so that we've had a chance to process
3838 // the -XX:-PrintWarnings flag
3839 if (needs_hotspotrc_warning) {
3840 warning("%s file is present but has been ignored. "
3841 "Run with -XX:Flags=%s to load the file.",
3842 hotspotrc, hotspotrc);
3843 }
3844
3845 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3846 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3847 #endif
3848
3849 #if INCLUDE_ALL_GCS
3850 #if (defined JAVASE_EMBEDDED || defined ARM)
3851 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3852 #endif
3853 #endif
3854
3855 #ifndef PRODUCT
3856 if (TraceBytecodesAt != 0) {
3857 TraceBytecodes = true;
3858 }
3859 if (CountCompiledCalls) {
3860 if (UseCounterDecay) {
3861 warning("UseCounterDecay disabled because CountCalls is set");
3862 UseCounterDecay = false;
3863 }
3864 }
3865 #endif // PRODUCT
3866
3867 if (ScavengeRootsInCode == 0) {
3868 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3869 warning("forcing ScavengeRootsInCode non-zero");
3870 }
3871 ScavengeRootsInCode = 1;
3872 }
3873
3874 if (PrintGCDetails) {
3875 // Turn on -verbose:gc options as well
3876 PrintGC = true;
3877 }
3878
3879 // Set object alignment values.
3880 set_object_alignment();
3881
3882 #if !INCLUDE_ALL_GCS
3883 force_serial_gc();
3884 #endif // INCLUDE_ALL_GCS
3885 #if !INCLUDE_CDS
3886 if (DumpSharedSpaces || RequireSharedSpaces) {
3887 jio_fprintf(defaultStream::error_stream(),
3888 "Shared spaces are not supported in this VM\n");
3889 return JNI_ERR;
3890 }
3891 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3892 warning("Shared spaces are not supported in this VM");
3893 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3894 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3895 }
3896 no_shared_spaces("CDS Disabled");
3897 #endif // INCLUDE_CDS
3898
3899 return JNI_OK;
3900 }
3901
3902 jint Arguments::apply_ergo() {
3903
3904 // Set flags based on ergonomics.
3905 set_ergonomics_flags();
3906
3907 set_shared_spaces_flags();
3908
3909 // Check the GC selections again.
3910 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3911 return JNI_EINVAL;
3912 }
3913
3914 if (TieredCompilation) {
3915 set_tiered_flags();
3916 } else {
3917 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3918 if (CompilationPolicyChoice >= 2) {
3919 vm_exit_during_initialization(
3920 "Incompatible compilation policy selected", NULL);
3921 }
3922 }
3923 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3924 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3925 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3926 }
3927
3928
3929 // Set heap size based on available physical memory
3930 set_heap_size();
3931
3932 set_gc_specific_flags();
3933
3934 // Initialize Metaspace flags and alignments
3935 Metaspace::ergo_initialize();
3936
3937 // Set bytecode rewriting flags
3938 set_bytecode_flags();
3939
3940 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3941 set_aggressive_opts_flags();
3942
3943 // Turn off biased locking for locking debug mode flags,
3944 // which are subtly different from each other but neither works with
3945 // biased locking
3946 if (UseHeavyMonitors
3947 #ifdef COMPILER1
3948 || !UseFastLocking
3949 #endif // COMPILER1
3950 ) {
3951 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3952 // flag set to true on command line; warn the user that they
3953 // can't enable biased locking here
3954 warning("Biased Locking is not supported with locking debug flags"
3955 "; ignoring UseBiasedLocking flag." );
3956 }
3957 UseBiasedLocking = false;
3958 }
3959
3960 #ifdef ZERO
3961 // Clear flags not supported on zero.
3962 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3963 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3964 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3965 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3966 #endif // CC_INTERP
3967
3968 #ifdef COMPILER2
3969 if (!EliminateLocks) {
3970 EliminateNestedLocks = false;
3971 }
3972 if (!Inline) {
3973 IncrementalInline = false;
3974 }
3975 #ifndef PRODUCT
3976 if (!IncrementalInline) {
3977 AlwaysIncrementalInline = false;
3978 }
3979 #endif
3980 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3981 // nothing to use the profiling, turn if off
3982 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3983 }
3984 #endif
3985
3986 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3987 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3988 DebugNonSafepoints = true;
3989 }
3990
3991 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3992 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3993 }
3994
3995 #ifndef PRODUCT
3996 if (CompileTheWorld) {
3997 // Force NmethodSweeper to sweep whole CodeCache each time.
3998 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3999 NmethodSweepFraction = 1;
4000 }
4001 }
4002
4003 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4004 if (use_vm_log()) {
4005 LogVMOutput = true;
4006 }
4007 }
4008 #endif // PRODUCT
4009
4010 if (PrintCommandLineFlags) {
4011 CommandLineFlags::printSetFlags(tty);
4012 }
4013
4014 // Apply CPU specific policy for the BiasedLocking
4015 if (UseBiasedLocking) {
4016 if (!VM_Version::use_biased_locking() &&
4017 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4018 UseBiasedLocking = false;
4019 }
4020 }
4021 #ifdef COMPILER2
4022 if (!UseBiasedLocking || EmitSync != 0) {
4023 UseOptoBiasInlining = false;
4024 }
4025 #endif
4026
4027 return JNI_OK;
4028 }
4029
4030 jint Arguments::adjust_after_os() {
4031 if (UseNUMA) {
4032 if (UseParallelGC || UseParallelOldGC) {
4033 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4034 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4035 }
4036 }
4037 // UseNUMAInterleaving is set to ON for all collectors and
4038 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4039 // such as the parallel collector for Linux and Solaris will
4040 // interleave old gen and survivor spaces on top of NUMA
4041 // allocation policy for the eden space.
4042 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4043 // all platforms and ParallelGC on Windows will interleave all
4044 // of the heap spaces across NUMA nodes.
4045 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4046 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4047 }
4048 }
4049 return JNI_OK;
4050 }
4051
4052 int Arguments::PropertyList_count(SystemProperty* pl) {
4053 int count = 0;
4054 while(pl != NULL) {
4055 count++;
4056 pl = pl->next();
4057 }
4058 return count;
4059 }
4060
4061 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4062 assert(key != NULL, "just checking");
4063 SystemProperty* prop;
4064 for (prop = pl; prop != NULL; prop = prop->next()) {
4065 if (strcmp(key, prop->key()) == 0) return prop->value();
4066 }
4067 return NULL;
4068 }
4069
4070 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4071 int count = 0;
4072 const char* ret_val = NULL;
4073
4074 while(pl != NULL) {
4075 if(count >= index) {
4076 ret_val = pl->key();
4077 break;
4078 }
4079 count++;
4080 pl = pl->next();
4081 }
4082
4083 return ret_val;
4084 }
4085
4086 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4087 int count = 0;
4088 char* ret_val = NULL;
4089
4090 while(pl != NULL) {
4091 if(count >= index) {
4092 ret_val = pl->value();
4093 break;
4094 }
4095 count++;
4096 pl = pl->next();
4097 }
4098
4099 return ret_val;
4100 }
4101
4102 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4103 SystemProperty* p = *plist;
4104 if (p == NULL) {
4105 *plist = new_p;
4106 } else {
4107 while (p->next() != NULL) {
4108 p = p->next();
4109 }
4110 p->set_next(new_p);
4111 }
4112 }
4113
4114 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4115 if (plist == NULL)
4116 return;
4117
4118 SystemProperty* new_p = new SystemProperty(k, v, true);
4119 PropertyList_add(plist, new_p);
4120 }
4121
4122 // This add maintains unique property key in the list.
4123 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4124 if (plist == NULL)
4125 return;
4126
4127 // If property key exist then update with new value.
4128 SystemProperty* prop;
4129 for (prop = *plist; prop != NULL; prop = prop->next()) {
4130 if (strcmp(k, prop->key()) == 0) {
4131 if (append) {
4132 prop->append_value(v);
4133 } else {
4134 prop->set_value(v);
4135 }
4136 return;
4137 }
4138 }
4139
4140 PropertyList_add(plist, k, v);
4141 }
4142
4143 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4144 // Returns true if all of the source pointed by src has been copied over to
4145 // the destination buffer pointed by buf. Otherwise, returns false.
4146 // Notes:
4147 // 1. If the length (buflen) of the destination buffer excluding the
4148 // NULL terminator character is not long enough for holding the expanded
4149 // pid characters, it also returns false instead of returning the partially
4150 // expanded one.
4151 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4152 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4153 char* buf, size_t buflen) {
4154 const char* p = src;
4155 char* b = buf;
4156 const char* src_end = &src[srclen];
4157 char* buf_end = &buf[buflen - 1];
4158
4159 while (p < src_end && b < buf_end) {
4160 if (*p == '%') {
4161 switch (*(++p)) {
4162 case '%': // "%%" ==> "%"
4163 *b++ = *p++;
4164 break;
4165 case 'p': { // "%p" ==> current process id
4166 // buf_end points to the character before the last character so
4167 // that we could write '\0' to the end of the buffer.
4168 size_t buf_sz = buf_end - b + 1;
4169 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4170
4171 // if jio_snprintf fails or the buffer is not long enough to hold
4172 // the expanded pid, returns false.
4173 if (ret < 0 || ret >= (int)buf_sz) {
4174 return false;
4175 } else {
4176 b += ret;
4177 assert(*b == '\0', "fail in copy_expand_pid");
4178 if (p == src_end && b == buf_end + 1) {
4179 // reach the end of the buffer.
4180 return true;
4181 }
4182 }
4183 p++;
4184 break;
4185 }
4186 default :
4187 *b++ = '%';
4188 }
4189 } else {
4190 *b++ = *p++;
4191 }
4192 }
4193 *b = '\0';
4194 return (p == src_end); // return false if not all of the source was copied
4195 }