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.java.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' to the remaining
130 // part of the option string.
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 // Check if 'option' matches 'name'. No "tail" is allowed.
143 static bool match_option(const JavaVMOption *option, const char* name) {
144 const char* tail = NULL;
145 bool result = match_option(option, name, &tail);
146 if (tail != NULL && *tail == '\0') {
147 return result;
148 } else {
149 return false;
150 }
151 }
152
153 // Return true if any of the strings in null-terminated array 'names' matches.
154 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
155 // the option must match exactly.
156 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
157 bool tail_allowed) {
158 for (/* empty */; *names != NULL; ++names) {
159 if (match_option(option, *names, tail)) {
160 if (**tail == '\0' || tail_allowed && **tail == ':') {
161 return true;
162 }
163 }
164 }
165 return false;
166 }
167
168 static void logOption(const char* opt) {
169 if (PrintVMOptions) {
170 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
171 }
172 }
173
174 // Process java launcher properties.
175 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
176 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
177 // sun.java.launcher.pid is defined.
178 // Must do this before setting up other system properties,
179 // as some of them may depend on launcher type.
180 for (int index = 0; index < args->nOptions; index++) {
181 const JavaVMOption* option = args->options + index;
182 const char* tail;
183
184 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
185 process_java_launcher_argument(tail, option->extraInfo);
186 continue;
187 }
188 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
189 if (strcmp(tail, "true") == 0) {
190 _sun_java_launcher_is_altjvm = true;
191 }
192 continue;
193 }
194 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
195 _sun_java_launcher_pid = atoi(tail);
196 continue;
197 }
198 }
199 }
200
201 // Initialize system properties key and value.
202 void Arguments::init_system_properties() {
203
204 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
205 "Java Virtual Machine Specification", false));
206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
208 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
209
210 // Following are JVMTI agent writable properties.
211 // Properties values are set to NULL and they are
212 // os specific they are initialized in os::init_system_properties_values().
213 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
214 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
215 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
216 _java_library_path = new SystemProperty("java.library.path", NULL, true);
217 _java_home = new SystemProperty("java.home", NULL, true);
218 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
219
220 _java_class_path = new SystemProperty("java.class.path", "", true);
221
222 // Add to System Property list.
223 PropertyList_add(&_system_properties, _java_ext_dirs);
224 PropertyList_add(&_system_properties, _java_endorsed_dirs);
225 PropertyList_add(&_system_properties, _sun_boot_library_path);
226 PropertyList_add(&_system_properties, _java_library_path);
227 PropertyList_add(&_system_properties, _java_home);
228 PropertyList_add(&_system_properties, _java_class_path);
229 PropertyList_add(&_system_properties, _sun_boot_class_path);
230
231 // Set OS specific system properties values
232 os::init_system_properties_values();
233 }
234
235
236 // Update/Initialize System properties after JDK version number is known
237 void Arguments::init_version_specific_system_properties() {
238 enum { bufsz = 16 };
239 char buffer[bufsz];
240 const char* spec_vendor = "Sun Microsystems Inc.";
241 uint32_t spec_version = 0;
242
243 spec_vendor = "Oracle Corporation";
244 spec_version = JDK_Version::current().major_version();
245 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
246
247 PropertyList_add(&_system_properties,
248 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
249 PropertyList_add(&_system_properties,
250 new SystemProperty("java.vm.specification.version", buffer, false));
251 PropertyList_add(&_system_properties,
252 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
253 }
254
255 /**
256 * Provide a slightly more user-friendly way of eliminating -XX flags.
257 * When a flag is eliminated, it can be added to this list in order to
258 * continue accepting this flag on the command-line, while issuing a warning
259 * and ignoring the value. Once the JDK version reaches the 'accept_until'
260 * limit, we flatly refuse to admit the existence of the flag. This allows
261 * a flag to die correctly over JDK releases using HSX.
262 */
263 typedef struct {
264 const char* name;
265 JDK_Version obsoleted_in; // when the flag went away
266 JDK_Version accept_until; // which version to start denying the existence
267 } ObsoleteFlag;
268
269 static ObsoleteFlag obsolete_jvm_flags[] = {
270 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
271 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
272 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
273 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
274 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
275 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
282 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
283 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
284 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
285 { "DefaultInitialRAMFraction",
286 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
287 { "UseDepthFirstScavengeOrder",
288 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
289 { "HandlePromotionFailure",
290 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
291 { "MaxLiveObjectEvacuationRatio",
292 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
293 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
294 { "UseParallelOldGCCompacting",
295 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
296 { "UseParallelDensePrefixUpdate",
297 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
298 { "UseParallelOldGCDensePrefix",
299 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
300 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
301 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
302 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
319 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
320 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
321 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
322 #ifdef PRODUCT
323 { "DesiredMethodLimit",
324 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
325 #endif // PRODUCT
326 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
327 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
328 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
329 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
330 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
331 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
332 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
333 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
334 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
335 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
336 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
337 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
338 #ifndef ZERO
339 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
340 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
341 #endif // ZERO
342 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
343 { NULL, JDK_Version(0), JDK_Version(0) }
344 };
345
346 // Returns true if the flag is obsolete and fits into the range specified
347 // for being ignored. In the case that the flag is ignored, the 'version'
348 // value is filled in with the version number when the flag became
349 // obsolete so that that value can be displayed to the user.
350 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
351 int i = 0;
352 assert(version != NULL, "Must provide a version buffer");
353 while (obsolete_jvm_flags[i].name != NULL) {
354 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
355 // <flag>=xxx form
356 // [-|+]<flag> form
357 size_t len = strlen(flag_status.name);
358 if (((strncmp(flag_status.name, s, len) == 0) &&
359 (strlen(s) == len)) ||
360 ((s[0] == '+' || s[0] == '-') &&
361 (strncmp(flag_status.name, &s[1], len) == 0) &&
362 (strlen(&s[1]) == len))) {
363 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
364 *version = flag_status.obsoleted_in;
365 return true;
366 }
367 }
368 i++;
369 }
370 return false;
371 }
372
373 // Constructs the system class path (aka boot class path) from the following
374 // components, in order:
375 //
376 // prefix // from -Xbootclasspath/p:...
377 // endorsed // the expansion of -Djava.endorsed.dirs=...
378 // base // from os::get_system_properties() or -Xbootclasspath=
379 // suffix // from -Xbootclasspath/a:...
380 //
381 // java.endorsed.dirs is a list of directories; any jar or zip files in the
382 // directories are added to the sysclasspath just before the base.
383 //
384 // This could be AllStatic, but it isn't needed after argument processing is
385 // complete.
386 class SysClassPath: public StackObj {
387 public:
388 SysClassPath(const char* base);
389 ~SysClassPath();
390
391 inline void set_base(const char* base);
392 inline void add_prefix(const char* prefix);
393 inline void add_suffix_to_prefix(const char* suffix);
394 inline void add_suffix(const char* suffix);
395 inline void reset_path(const char* base);
396
397 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
398 // property. Must be called after all command-line arguments have been
399 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
400 // combined_path().
401 void expand_endorsed();
402
403 inline const char* get_base() const { return _items[_scp_base]; }
404 inline const char* get_prefix() const { return _items[_scp_prefix]; }
405 inline const char* get_suffix() const { return _items[_scp_suffix]; }
406 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
407
408 // Combine all the components into a single c-heap-allocated string; caller
409 // must free the string if/when no longer needed.
410 char* combined_path();
411
412 private:
413 // Utility routines.
414 static char* add_to_path(const char* path, const char* str, bool prepend);
415 static char* add_jars_to_path(char* path, const char* directory);
416
417 inline void reset_item_at(int index);
418
419 // Array indices for the items that make up the sysclasspath. All except the
420 // base are allocated in the C heap and freed by this class.
421 enum {
422 _scp_prefix, // from -Xbootclasspath/p:...
423 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
424 _scp_base, // the default sysclasspath
425 _scp_suffix, // from -Xbootclasspath/a:...
426 _scp_nitems // the number of items, must be last.
427 };
428
429 const char* _items[_scp_nitems];
430 DEBUG_ONLY(bool _expansion_done;)
431 };
432
433 SysClassPath::SysClassPath(const char* base) {
434 memset(_items, 0, sizeof(_items));
435 _items[_scp_base] = base;
436 DEBUG_ONLY(_expansion_done = false;)
437 }
438
439 SysClassPath::~SysClassPath() {
440 // Free everything except the base.
441 for (int i = 0; i < _scp_nitems; ++i) {
442 if (i != _scp_base) reset_item_at(i);
443 }
444 DEBUG_ONLY(_expansion_done = false;)
445 }
446
447 inline void SysClassPath::set_base(const char* base) {
448 _items[_scp_base] = base;
449 }
450
451 inline void SysClassPath::add_prefix(const char* prefix) {
452 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
453 }
454
455 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
456 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
457 }
458
459 inline void SysClassPath::add_suffix(const char* suffix) {
460 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
461 }
462
463 inline void SysClassPath::reset_item_at(int index) {
464 assert(index < _scp_nitems && index != _scp_base, "just checking");
465 if (_items[index] != NULL) {
466 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
467 _items[index] = NULL;
468 }
469 }
470
471 inline void SysClassPath::reset_path(const char* base) {
472 // Clear the prefix and suffix.
473 reset_item_at(_scp_prefix);
474 reset_item_at(_scp_suffix);
475 set_base(base);
476 }
477
478 //------------------------------------------------------------------------------
479
480 void SysClassPath::expand_endorsed() {
481 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
482
483 const char* path = Arguments::get_property("java.endorsed.dirs");
484 if (path == NULL) {
485 path = Arguments::get_endorsed_dir();
486 assert(path != NULL, "no default for java.endorsed.dirs");
487 }
488
489 char* expanded_path = NULL;
490 const char separator = *os::path_separator();
491 const char* const end = path + strlen(path);
492 while (path < end) {
493 const char* tmp_end = strchr(path, separator);
494 if (tmp_end == NULL) {
495 expanded_path = add_jars_to_path(expanded_path, path);
496 path = end;
497 } else {
498 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
499 memcpy(dirpath, path, tmp_end - path);
500 dirpath[tmp_end - path] = '\0';
501 expanded_path = add_jars_to_path(expanded_path, dirpath);
502 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
503 path = tmp_end + 1;
504 }
505 }
506 _items[_scp_endorsed] = expanded_path;
507 DEBUG_ONLY(_expansion_done = true;)
508 }
509
510 // Combine the bootclasspath elements, some of which may be null, into a single
511 // c-heap-allocated string.
512 char* SysClassPath::combined_path() {
513 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
514 assert(_expansion_done, "must call expand_endorsed() first.");
515
516 size_t lengths[_scp_nitems];
517 size_t total_len = 0;
518
519 const char separator = *os::path_separator();
520
521 // Get the lengths.
522 int i;
523 for (i = 0; i < _scp_nitems; ++i) {
524 if (_items[i] != NULL) {
525 lengths[i] = strlen(_items[i]);
526 // Include space for the separator char (or a NULL for the last item).
527 total_len += lengths[i] + 1;
528 }
529 }
530 assert(total_len > 0, "empty sysclasspath not allowed");
531
532 // Copy the _items to a single string.
533 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
534 char* cp_tmp = cp;
535 for (i = 0; i < _scp_nitems; ++i) {
536 if (_items[i] != NULL) {
537 memcpy(cp_tmp, _items[i], lengths[i]);
538 cp_tmp += lengths[i];
539 *cp_tmp++ = separator;
540 }
541 }
542 *--cp_tmp = '\0'; // Replace the extra separator.
543 return cp;
544 }
545
546 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
547 char*
548 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
549 char *cp;
550
551 assert(str != NULL, "just checking");
552 if (path == NULL) {
553 size_t len = strlen(str) + 1;
554 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
555 memcpy(cp, str, len); // copy the trailing null
556 } else {
557 const char separator = *os::path_separator();
558 size_t old_len = strlen(path);
559 size_t str_len = strlen(str);
560 size_t len = old_len + str_len + 2;
561
562 if (prepend) {
563 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
564 char* cp_tmp = cp;
565 memcpy(cp_tmp, str, str_len);
566 cp_tmp += str_len;
567 *cp_tmp = separator;
568 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
569 FREE_C_HEAP_ARRAY(char, path, mtInternal);
570 } else {
571 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
572 char* cp_tmp = cp + old_len;
573 *cp_tmp = separator;
574 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
575 }
576 }
577 return cp;
578 }
579
580 // Scan the directory and append any jar or zip files found to path.
581 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
582 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
583 DIR* dir = os::opendir(directory);
584 if (dir == NULL) return path;
585
586 char dir_sep[2] = { '\0', '\0' };
587 size_t directory_len = strlen(directory);
588 const char fileSep = *os::file_separator();
589 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
590
591 /* Scan the directory for jars/zips, appending them to path. */
592 struct dirent *entry;
593 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
594 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
595 const char* name = entry->d_name;
596 const char* ext = name + strlen(name) - 4;
597 bool isJarOrZip = ext > name &&
598 (os::file_name_strcmp(ext, ".jar") == 0 ||
599 os::file_name_strcmp(ext, ".zip") == 0);
600 if (isJarOrZip) {
601 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
602 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
603 path = add_to_path(path, jarpath, false);
604 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
605 }
606 }
607 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
608 os::closedir(dir);
609 return path;
610 }
611
612 // Parses a memory size specification string.
613 static bool atomull(const char *s, julong* result) {
614 julong n = 0;
615 int args_read = 0;
616 bool is_hex = false;
617 // Skip leading 0[xX] for hexadecimal
618 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
619 s += 2;
620 is_hex = true;
621 args_read = sscanf(s, JULONG_FORMAT_X, &n);
622 } else {
623 args_read = sscanf(s, JULONG_FORMAT, &n);
624 }
625 if (args_read != 1) {
626 return false;
627 }
628 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
629 s++;
630 }
631 // 4705540: illegal if more characters are found after the first non-digit
632 if (strlen(s) > 1) {
633 return false;
634 }
635 switch (*s) {
636 case 'T': case 't':
637 *result = n * G * K;
638 // Check for overflow.
639 if (*result/((julong)G * K) != n) return false;
640 return true;
641 case 'G': case 'g':
642 *result = n * G;
643 if (*result/G != n) return false;
644 return true;
645 case 'M': case 'm':
646 *result = n * M;
647 if (*result/M != n) return false;
648 return true;
649 case 'K': case 'k':
650 *result = n * K;
651 if (*result/K != n) return false;
652 return true;
653 case '\0':
654 *result = n;
655 return true;
656 default:
657 return false;
658 }
659 }
660
661 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
662 if (size < min_size) return arg_too_small;
663 // Check that size will fit in a size_t (only relevant on 32-bit)
664 if (size > max_uintx) return arg_too_big;
665 return arg_in_range;
666 }
667
668 // Describe an argument out of range error
669 void Arguments::describe_range_error(ArgsRange errcode) {
670 switch(errcode) {
671 case arg_too_big:
672 jio_fprintf(defaultStream::error_stream(),
673 "The specified size exceeds the maximum "
674 "representable size.\n");
675 break;
676 case arg_too_small:
677 case arg_unreadable:
678 case arg_in_range:
679 // do nothing for now
680 break;
681 default:
682 ShouldNotReachHere();
683 }
684 }
685
686 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
687 return CommandLineFlags::boolAtPut(name, &value, origin);
688 }
689
690 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
691 double v;
692 if (sscanf(value, "%lf", &v) != 1) {
693 return false;
694 }
695
696 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
697 return true;
698 }
699 return false;
700 }
701
702 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
703 julong v;
704 intx intx_v;
705 bool is_neg = false;
706 // Check the sign first since atomull() parses only unsigned values.
707 if (*value == '-') {
708 if (!CommandLineFlags::intxAt(name, &intx_v)) {
709 return false;
710 }
711 value++;
712 is_neg = true;
713 }
714 if (!atomull(value, &v)) {
715 return false;
716 }
717 intx_v = (intx) v;
718 if (is_neg) {
719 intx_v = -intx_v;
720 }
721 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
722 return true;
723 }
724 uintx uintx_v = (uintx) v;
725 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
726 return true;
727 }
728 uint64_t uint64_t_v = (uint64_t) v;
729 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
730 return true;
731 }
732 size_t size_t_v = (size_t) v;
733 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
734 return true;
735 }
736 return false;
737 }
738
739 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
740 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
741 // Contract: CommandLineFlags always returns a pointer that needs freeing.
742 FREE_C_HEAP_ARRAY(char, value, mtInternal);
743 return true;
744 }
745
746 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
747 const char* old_value = "";
748 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
749 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
750 size_t new_len = strlen(new_value);
751 const char* value;
752 char* free_this_too = NULL;
753 if (old_len == 0) {
754 value = new_value;
755 } else if (new_len == 0) {
756 value = old_value;
757 } else {
758 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
759 // each new setting adds another LINE to the switch:
760 sprintf(buf, "%s\n%s", old_value, new_value);
761 value = buf;
762 free_this_too = buf;
763 }
764 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
765 // CommandLineFlags always returns a pointer that needs freeing.
766 FREE_C_HEAP_ARRAY(char, value, mtInternal);
767 if (free_this_too != NULL) {
768 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
769 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
770 }
771 return true;
772 }
773
774 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
775
776 // range of acceptable characters spelled out for portability reasons
777 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
778 #define BUFLEN 255
779 char name[BUFLEN+1];
780 char dummy;
781
782 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
783 return set_bool_flag(name, false, origin);
784 }
785 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
786 return set_bool_flag(name, true, origin);
787 }
788
789 char punct;
790 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
791 const char* value = strchr(arg, '=') + 1;
792 Flag* flag = Flag::find_flag(name, strlen(name));
793 if (flag != NULL && flag->is_ccstr()) {
794 if (flag->ccstr_accumulates()) {
795 return append_to_string_flag(name, value, origin);
796 } else {
797 if (value[0] == '\0') {
798 value = NULL;
799 }
800 return set_string_flag(name, value, origin);
801 }
802 }
803 }
804
805 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
806 const char* value = strchr(arg, '=') + 1;
807 // -XX:Foo:=xxx will reset the string flag to the given value.
808 if (value[0] == '\0') {
809 value = NULL;
810 }
811 return set_string_flag(name, value, origin);
812 }
813
814 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
815 #define SIGNED_NUMBER_RANGE "[-0123456789]"
816 #define NUMBER_RANGE "[0123456789]"
817 char value[BUFLEN + 1];
818 char value2[BUFLEN + 1];
819 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
820 // Looks like a floating-point number -- try again with more lenient format string
821 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
822 return set_fp_numeric_flag(name, value, origin);
823 }
824 }
825
826 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
827 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
828 return set_numeric_flag(name, value, origin);
829 }
830
831 return false;
832 }
833
834 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
835 assert(bldarray != NULL, "illegal argument");
836
837 if (arg == NULL) {
838 return;
839 }
840
841 int new_count = *count + 1;
842
843 // expand the array and add arg to the last element
844 if (*bldarray == NULL) {
845 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
846 } else {
847 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
848 }
849 (*bldarray)[*count] = os::strdup_check_oom(arg);
850 *count = new_count;
851 }
852
853 void Arguments::build_jvm_args(const char* arg) {
854 add_string(&_jvm_args_array, &_num_jvm_args, arg);
855 }
856
857 void Arguments::build_jvm_flags(const char* arg) {
858 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
859 }
860
861 // utility function to return a string that concatenates all
862 // strings in a given char** array
863 const char* Arguments::build_resource_string(char** args, int count) {
864 if (args == NULL || count == 0) {
865 return NULL;
866 }
867 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
868 for (int i = 1; i < count; i++) {
869 length += strlen(args[i]) + 1; // add 1 for a space
870 }
871 char* s = NEW_RESOURCE_ARRAY(char, length);
872 strcpy(s, args[0]);
873 for (int j = 1; j < count; j++) {
874 strcat(s, " ");
875 strcat(s, args[j]);
876 }
877 return (const char*) s;
878 }
879
880 void Arguments::print_on(outputStream* st) {
881 st->print_cr("VM Arguments:");
882 if (num_jvm_flags() > 0) {
883 st->print("jvm_flags: "); print_jvm_flags_on(st);
884 }
885 if (num_jvm_args() > 0) {
886 st->print("jvm_args: "); print_jvm_args_on(st);
887 }
888 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
889 if (_java_class_path != NULL) {
890 char* path = _java_class_path->value();
891 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
892 }
893 st->print_cr("Launcher Type: %s", _sun_java_launcher);
894 }
895
896 void Arguments::print_jvm_flags_on(outputStream* st) {
897 if (_num_jvm_flags > 0) {
898 for (int i=0; i < _num_jvm_flags; i++) {
899 st->print("%s ", _jvm_flags_array[i]);
900 }
901 st->cr();
902 }
903 }
904
905 void Arguments::print_jvm_args_on(outputStream* st) {
906 if (_num_jvm_args > 0) {
907 for (int i=0; i < _num_jvm_args; i++) {
908 st->print("%s ", _jvm_args_array[i]);
909 }
910 st->cr();
911 }
912 }
913
914 bool Arguments::process_argument(const char* arg,
915 jboolean ignore_unrecognized, Flag::Flags origin) {
916
917 JDK_Version since = JDK_Version();
918
919 if (parse_argument(arg, origin) || ignore_unrecognized) {
920 return true;
921 }
922
923 bool has_plus_minus = (*arg == '+' || *arg == '-');
924 const char* const argname = has_plus_minus ? arg + 1 : arg;
925 if (is_newly_obsolete(arg, &since)) {
926 char version[256];
927 since.to_string(version, sizeof(version));
928 warning("ignoring option %s; support was removed in %s", argname, version);
929 return true;
930 }
931
932 // For locked flags, report a custom error message if available.
933 // Otherwise, report the standard unrecognized VM option.
934
935 size_t arg_len;
936 const char* equal_sign = strchr(argname, '=');
937 if (equal_sign == NULL) {
938 arg_len = strlen(argname);
939 } else {
940 arg_len = equal_sign - argname;
941 }
942
943 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
944 if (found_flag != NULL) {
945 char locked_message_buf[BUFLEN];
946 found_flag->get_locked_message(locked_message_buf, BUFLEN);
947 if (strlen(locked_message_buf) == 0) {
948 if (found_flag->is_bool() && !has_plus_minus) {
949 jio_fprintf(defaultStream::error_stream(),
950 "Missing +/- setting for VM option '%s'\n", argname);
951 } else if (!found_flag->is_bool() && has_plus_minus) {
952 jio_fprintf(defaultStream::error_stream(),
953 "Unexpected +/- setting in VM option '%s'\n", argname);
954 } else {
955 jio_fprintf(defaultStream::error_stream(),
956 "Improperly specified VM option '%s'\n", argname);
957 }
958 } else {
959 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
960 }
961 } else {
962 jio_fprintf(defaultStream::error_stream(),
963 "Unrecognized VM option '%s'\n", argname);
964 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
965 if (fuzzy_matched != NULL) {
966 jio_fprintf(defaultStream::error_stream(),
967 "Did you mean '%s%s%s'? ",
968 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
969 fuzzy_matched->_name,
970 (fuzzy_matched->is_bool()) ? "" : "=<value>");
971 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
972 char version[256];
973 since.to_string(version, sizeof(version));
974 jio_fprintf(defaultStream::error_stream(),
975 "Warning: support for %s was removed in %s\n",
976 fuzzy_matched->_name,
977 version);
978 }
979 }
980 }
981
982 // allow for commandline "commenting out" options like -XX:#+Verbose
983 return arg[0] == '#';
984 }
985
986 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
987 FILE* stream = fopen(file_name, "rb");
988 if (stream == NULL) {
989 if (should_exist) {
990 jio_fprintf(defaultStream::error_stream(),
991 "Could not open settings file %s\n", file_name);
992 return false;
993 } else {
994 return true;
995 }
996 }
997
998 char token[1024];
999 int pos = 0;
1000
1001 bool in_white_space = true;
1002 bool in_comment = false;
1003 bool in_quote = false;
1004 char quote_c = 0;
1005 bool result = true;
1006
1007 int c = getc(stream);
1008 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1009 if (in_white_space) {
1010 if (in_comment) {
1011 if (c == '\n') in_comment = false;
1012 } else {
1013 if (c == '#') in_comment = true;
1014 else if (!isspace(c)) {
1015 in_white_space = false;
1016 token[pos++] = c;
1017 }
1018 }
1019 } else {
1020 if (c == '\n' || (!in_quote && isspace(c))) {
1021 // token ends at newline, or at unquoted whitespace
1022 // this allows a way to include spaces in string-valued options
1023 token[pos] = '\0';
1024 logOption(token);
1025 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1026 build_jvm_flags(token);
1027 pos = 0;
1028 in_white_space = true;
1029 in_quote = false;
1030 } else if (!in_quote && (c == '\'' || c == '"')) {
1031 in_quote = true;
1032 quote_c = c;
1033 } else if (in_quote && (c == quote_c)) {
1034 in_quote = false;
1035 } else {
1036 token[pos++] = c;
1037 }
1038 }
1039 c = getc(stream);
1040 }
1041 if (pos > 0) {
1042 token[pos] = '\0';
1043 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1044 build_jvm_flags(token);
1045 }
1046 fclose(stream);
1047 return result;
1048 }
1049
1050 //=============================================================================================================
1051 // Parsing of properties (-D)
1052
1053 const char* Arguments::get_property(const char* key) {
1054 return PropertyList_get_value(system_properties(), key);
1055 }
1056
1057 bool Arguments::add_property(const char* prop) {
1058 const char* eq = strchr(prop, '=');
1059 char* key;
1060 // ns must be static--its address may be stored in a SystemProperty object.
1061 const static char ns[1] = {0};
1062 char* value = (char *)ns;
1063
1064 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1065 key = AllocateHeap(key_len + 1, mtInternal);
1066 strncpy(key, prop, key_len);
1067 key[key_len] = '\0';
1068
1069 if (eq != NULL) {
1070 size_t value_len = strlen(prop) - key_len - 1;
1071 value = AllocateHeap(value_len + 1, mtInternal);
1072 strncpy(value, &prop[key_len + 1], value_len + 1);
1073 }
1074
1075 if (strcmp(key, "java.compiler") == 0) {
1076 process_java_compiler_argument(value);
1077 FreeHeap(key);
1078 if (eq != NULL) {
1079 FreeHeap(value);
1080 }
1081 return true;
1082 } else if (strcmp(key, "sun.java.command") == 0) {
1083 _java_command = value;
1084
1085 // Record value in Arguments, but let it get passed to Java.
1086 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1087 strcmp(key, "sun.java.launcher.pid") == 0) {
1088 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1089 // private and are processed in process_sun_java_launcher_properties();
1090 // the sun.java.launcher property is passed on to the java application
1091 FreeHeap(key);
1092 if (eq != NULL) {
1093 FreeHeap(value);
1094 }
1095 return true;
1096 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1097 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1098 // its value without going through the property list or making a Java call.
1099 _java_vendor_url_bug = value;
1100 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1101 PropertyList_unique_add(&_system_properties, key, value, true);
1102 return true;
1103 }
1104 // Create new property and add at the end of the list
1105 PropertyList_unique_add(&_system_properties, key, value);
1106 return true;
1107 }
1108
1109 //===========================================================================================================
1110 // Setting int/mixed/comp mode flags
1111
1112 void Arguments::set_mode_flags(Mode mode) {
1113 // Set up default values for all flags.
1114 // If you add a flag to any of the branches below,
1115 // add a default value for it here.
1116 set_java_compiler(false);
1117 _mode = mode;
1118
1119 // Ensure Agent_OnLoad has the correct initial values.
1120 // This may not be the final mode; mode may change later in onload phase.
1121 PropertyList_unique_add(&_system_properties, "java.vm.info",
1122 (char*)VM_Version::vm_info_string(), false);
1123
1124 UseInterpreter = true;
1125 UseCompiler = true;
1126 UseLoopCounter = true;
1127
1128 // Default values may be platform/compiler dependent -
1129 // use the saved values
1130 ClipInlining = Arguments::_ClipInlining;
1131 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1132 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1133 BackgroundCompilation = Arguments::_BackgroundCompilation;
1134
1135 // Change from defaults based on mode
1136 switch (mode) {
1137 default:
1138 ShouldNotReachHere();
1139 break;
1140 case _int:
1141 UseCompiler = false;
1142 UseLoopCounter = false;
1143 AlwaysCompileLoopMethods = false;
1144 UseOnStackReplacement = false;
1145 break;
1146 case _mixed:
1147 // same as default
1148 break;
1149 case _comp:
1150 UseInterpreter = false;
1151 BackgroundCompilation = false;
1152 ClipInlining = false;
1153 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1154 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1155 // compile a level 4 (C2) and then continue executing it.
1156 if (TieredCompilation) {
1157 Tier3InvokeNotifyFreqLog = 0;
1158 Tier4InvocationThreshold = 0;
1159 }
1160 break;
1161 }
1162 }
1163
1164 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1165 // Conflict: required to use shared spaces (-Xshare:on), but
1166 // incompatible command line options were chosen.
1167
1168 static void no_shared_spaces(const char* message) {
1169 if (RequireSharedSpaces) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Class data sharing is inconsistent with other specified options.\n");
1172 vm_exit_during_initialization("Unable to use shared archive.", message);
1173 } else {
1174 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1175 }
1176 }
1177 #endif
1178
1179 // Returns threshold scaled with CompileThresholdScaling
1180 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1181 return (intx)(threshold * CompileThresholdScaling);
1182 }
1183
1184 // Returns freq_log scaled with CompileThresholdScaling
1185 intx Arguments::get_scaled_freq_log(intx freq_log) {
1186 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1187 if (scaled_freq == 0) {
1188 return 0;
1189 } else {
1190 return log2_intptr(scaled_freq);
1191 }
1192 }
1193
1194 void Arguments::set_tiered_flags() {
1195 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1196 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1197 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1198 }
1199 if (CompilationPolicyChoice < 2) {
1200 vm_exit_during_initialization(
1201 "Incompatible compilation policy selected", NULL);
1202 }
1203 // Increase the code cache size - tiered compiles a lot more.
1204 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1205 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1206 }
1207 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1208 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1209 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1210
1211 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1212 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1213 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1214 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1215 }
1216 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1217 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1218 }
1219 // Check consistency of code heap sizes
1220 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1221 jio_fprintf(defaultStream::error_stream(),
1222 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1223 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1224 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1225 vm_exit(1);
1226 }
1227 }
1228 }
1229 if (!UseInterpreter) { // -Xcomp
1230 Tier3InvokeNotifyFreqLog = 0;
1231 Tier4InvocationThreshold = 0;
1232 }
1233 // Scale tiered compilation thresholds
1234 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1235 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1236 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1237
1238 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1239 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1240 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1241 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1242
1243 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1244 // once these thresholds become supported.
1245
1246 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1247 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1248
1249 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1250 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1251
1252 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1253
1254 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1255 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1256 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1257 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1258 }
1259 }
1260
1261 /**
1262 * Returns the minimum number of compiler threads needed to run the JVM. The following
1263 * configurations are possible.
1264 *
1265 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1266 * compiler threads is 0.
1267 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1268 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1269 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1270 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1271 * C1 can be used, so the minimum number of compiler threads is 1.
1272 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1273 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1274 * the minimum number of compiler threads is 2.
1275 */
1276 int Arguments::get_min_number_of_compiler_threads() {
1277 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1278 return 0; // case 1
1279 #else
1280 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1281 return 1; // case 2 or case 3
1282 }
1283 return 2; // case 4 (tiered)
1284 #endif
1285 }
1286
1287 #if INCLUDE_ALL_GCS
1288 static void disable_adaptive_size_policy(const char* collector_name) {
1289 if (UseAdaptiveSizePolicy) {
1290 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1291 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1292 collector_name);
1293 }
1294 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1295 }
1296 }
1297
1298 void Arguments::set_parnew_gc_flags() {
1299 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1300 "control point invariant");
1301 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1302 assert(UseParNewGC, "ParNew should always be used with CMS");
1303
1304 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1305 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1306 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1307 } else if (ParallelGCThreads == 0) {
1308 jio_fprintf(defaultStream::error_stream(),
1309 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1310 vm_exit(1);
1311 }
1312
1313 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1314 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1315 // we set them to 1024 and 1024.
1316 // See CR 6362902.
1317 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1318 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1319 }
1320 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1321 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1322 }
1323
1324 // When using compressed oops, we use local overflow stacks,
1325 // rather than using a global overflow list chained through
1326 // the klass word of the object's pre-image.
1327 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1328 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1329 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1330 }
1331 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1332 }
1333 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1334 }
1335
1336 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1337 // sparc/solaris for certain applications, but would gain from
1338 // further optimization and tuning efforts, and would almost
1339 // certainly gain from analysis of platform and environment.
1340 void Arguments::set_cms_and_parnew_gc_flags() {
1341 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1342 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1343 assert(UseParNewGC, "ParNew should always be used with CMS");
1344
1345 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1346 disable_adaptive_size_policy("UseConcMarkSweepGC");
1347
1348 set_parnew_gc_flags();
1349
1350 size_t max_heap = align_size_down(MaxHeapSize,
1351 CardTableRS::ct_max_alignment_constraint());
1352
1353 // Now make adjustments for CMS
1354 intx tenuring_default = (intx)6;
1355 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1356
1357 // Preferred young gen size for "short" pauses:
1358 // upper bound depends on # of threads and NewRatio.
1359 const uintx parallel_gc_threads =
1360 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1361 const size_t preferred_max_new_size_unaligned =
1362 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1363 size_t preferred_max_new_size =
1364 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1365
1366 // Unless explicitly requested otherwise, size young gen
1367 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1368
1369 // If either MaxNewSize or NewRatio is set on the command line,
1370 // assume the user is trying to set the size of the young gen.
1371 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1372
1373 // Set MaxNewSize to our calculated preferred_max_new_size unless
1374 // NewSize was set on the command line and it is larger than
1375 // preferred_max_new_size.
1376 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1377 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1378 } else {
1379 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1380 }
1381 if (PrintGCDetails && Verbose) {
1382 // Too early to use gclog_or_tty
1383 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1384 }
1385
1386 // Code along this path potentially sets NewSize and OldSize
1387 if (PrintGCDetails && Verbose) {
1388 // Too early to use gclog_or_tty
1389 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1390 " initial_heap_size: " SIZE_FORMAT
1391 " max_heap: " SIZE_FORMAT,
1392 min_heap_size(), InitialHeapSize, max_heap);
1393 }
1394 size_t min_new = preferred_max_new_size;
1395 if (FLAG_IS_CMDLINE(NewSize)) {
1396 min_new = NewSize;
1397 }
1398 if (max_heap > min_new && min_heap_size() > min_new) {
1399 // Unless explicitly requested otherwise, make young gen
1400 // at least min_new, and at most preferred_max_new_size.
1401 if (FLAG_IS_DEFAULT(NewSize)) {
1402 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1403 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1404 if (PrintGCDetails && Verbose) {
1405 // Too early to use gclog_or_tty
1406 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1407 }
1408 }
1409 // Unless explicitly requested otherwise, size old gen
1410 // so it's NewRatio x of NewSize.
1411 if (FLAG_IS_DEFAULT(OldSize)) {
1412 if (max_heap > NewSize) {
1413 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1414 if (PrintGCDetails && Verbose) {
1415 // Too early to use gclog_or_tty
1416 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1417 }
1418 }
1419 }
1420 }
1421 }
1422 // Unless explicitly requested otherwise, definitely
1423 // promote all objects surviving "tenuring_default" scavenges.
1424 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1425 FLAG_IS_DEFAULT(SurvivorRatio)) {
1426 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1427 }
1428 // If we decided above (or user explicitly requested)
1429 // `promote all' (via MaxTenuringThreshold := 0),
1430 // prefer minuscule survivor spaces so as not to waste
1431 // space for (non-existent) survivors
1432 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1433 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1434 }
1435 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1436 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1437 // This is done in order to make ParNew+CMS configuration to work
1438 // with YoungPLABSize and OldPLABSize options.
1439 // See CR 6362902.
1440 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1441 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1442 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1443 // is. In this situation let CMSParPromoteBlocksToClaim follow
1444 // the value (either from the command line or ergonomics) of
1445 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1446 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1447 } else {
1448 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1449 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1450 // we'll let it to take precedence.
1451 jio_fprintf(defaultStream::error_stream(),
1452 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1453 " options are specified for the CMS collector."
1454 " CMSParPromoteBlocksToClaim will take precedence.\n");
1455 }
1456 }
1457 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1458 // OldPLAB sizing manually turned off: Use a larger default setting,
1459 // unless it was manually specified. This is because a too-low value
1460 // will slow down scavenges.
1461 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1462 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1463 }
1464 }
1465 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1466 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1467 // If either of the static initialization defaults have changed, note this
1468 // modification.
1469 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1470 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1471 }
1472 if (PrintGCDetails && Verbose) {
1473 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1474 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1475 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1476 }
1477 }
1478 #endif // INCLUDE_ALL_GCS
1479
1480 void set_object_alignment() {
1481 // Object alignment.
1482 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1483 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1484 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1485 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1486 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1487 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1488
1489 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1490 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1491
1492 // Oop encoding heap max
1493 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1494
1495 #if INCLUDE_ALL_GCS
1496 // Set CMS global values
1497 CompactibleFreeListSpace::set_cms_values();
1498 #endif // INCLUDE_ALL_GCS
1499 }
1500
1501 bool verify_object_alignment() {
1502 // Object alignment.
1503 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1504 jio_fprintf(defaultStream::error_stream(),
1505 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1506 (int)ObjectAlignmentInBytes);
1507 return false;
1508 }
1509 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1510 jio_fprintf(defaultStream::error_stream(),
1511 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1512 (int)ObjectAlignmentInBytes, BytesPerLong);
1513 return false;
1514 }
1515 // It does not make sense to have big object alignment
1516 // since a space lost due to alignment will be greater
1517 // then a saved space from compressed oops.
1518 if ((int)ObjectAlignmentInBytes > 256) {
1519 jio_fprintf(defaultStream::error_stream(),
1520 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1521 (int)ObjectAlignmentInBytes);
1522 return false;
1523 }
1524 // In case page size is very small.
1525 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1526 jio_fprintf(defaultStream::error_stream(),
1527 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1528 (int)ObjectAlignmentInBytes, os::vm_page_size());
1529 return false;
1530 }
1531 if(SurvivorAlignmentInBytes == 0) {
1532 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1533 } else {
1534 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1535 jio_fprintf(defaultStream::error_stream(),
1536 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1537 (int)SurvivorAlignmentInBytes);
1538 return false;
1539 }
1540 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1541 jio_fprintf(defaultStream::error_stream(),
1542 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1543 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1544 return false;
1545 }
1546 }
1547 return true;
1548 }
1549
1550 size_t Arguments::max_heap_for_compressed_oops() {
1551 // Avoid sign flip.
1552 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1553 // We need to fit both the NULL page and the heap into the memory budget, while
1554 // keeping alignment constraints of the heap. To guarantee the latter, as the
1555 // NULL page is located before the heap, we pad the NULL page to the conservative
1556 // maximum alignment that the GC may ever impose upon the heap.
1557 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1558 _conservative_max_heap_alignment);
1559
1560 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1561 NOT_LP64(ShouldNotReachHere(); return 0);
1562 }
1563
1564 bool Arguments::should_auto_select_low_pause_collector() {
1565 if (UseAutoGCSelectPolicy &&
1566 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1567 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1568 if (PrintGCDetails) {
1569 // Cannot use gclog_or_tty yet.
1570 tty->print_cr("Automatic selection of the low pause collector"
1571 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1572 }
1573 return true;
1574 }
1575 return false;
1576 }
1577
1578 void Arguments::set_use_compressed_oops() {
1579 #ifndef ZERO
1580 #ifdef _LP64
1581 // MaxHeapSize is not set up properly at this point, but
1582 // the only value that can override MaxHeapSize if we are
1583 // to use UseCompressedOops is InitialHeapSize.
1584 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1585
1586 if (max_heap_size <= max_heap_for_compressed_oops()) {
1587 #if !defined(COMPILER1) || defined(TIERED)
1588 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1589 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1590 }
1591 #endif
1592 #ifdef _WIN64
1593 if (UseLargePages && UseCompressedOops) {
1594 // Cannot allocate guard pages for implicit checks in indexed addressing
1595 // mode, when large pages are specified on windows.
1596 // This flag could be switched ON if narrow oop base address is set to 0,
1597 // see code in Universe::initialize_heap().
1598 Universe::set_narrow_oop_use_implicit_null_checks(false);
1599 }
1600 #endif // _WIN64
1601 } else {
1602 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1603 warning("Max heap size too large for Compressed Oops");
1604 FLAG_SET_DEFAULT(UseCompressedOops, false);
1605 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1606 }
1607 }
1608 #endif // _LP64
1609 #endif // ZERO
1610 }
1611
1612
1613 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1614 // set_use_compressed_oops().
1615 void Arguments::set_use_compressed_klass_ptrs() {
1616 #ifndef ZERO
1617 #ifdef _LP64
1618 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1619 if (!UseCompressedOops) {
1620 if (UseCompressedClassPointers) {
1621 warning("UseCompressedClassPointers requires UseCompressedOops");
1622 }
1623 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1624 } else {
1625 // Turn on UseCompressedClassPointers too
1626 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1627 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1628 }
1629 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1630 if (UseCompressedClassPointers) {
1631 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1632 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1633 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1634 }
1635 }
1636 }
1637 #endif // _LP64
1638 #endif // !ZERO
1639 }
1640
1641 void Arguments::set_conservative_max_heap_alignment() {
1642 // The conservative maximum required alignment for the heap is the maximum of
1643 // the alignments imposed by several sources: any requirements from the heap
1644 // itself, the collector policy and the maximum page size we may run the VM
1645 // with.
1646 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1647 #if INCLUDE_ALL_GCS
1648 if (UseParallelGC) {
1649 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1650 } else if (UseG1GC) {
1651 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1652 }
1653 #endif // INCLUDE_ALL_GCS
1654 _conservative_max_heap_alignment = MAX4(heap_alignment,
1655 (size_t)os::vm_allocation_granularity(),
1656 os::max_page_size(),
1657 CollectorPolicy::compute_heap_alignment());
1658 }
1659
1660 void Arguments::select_gc_ergonomically() {
1661 if (os::is_server_class_machine()) {
1662 if (should_auto_select_low_pause_collector()) {
1663 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1664 } else {
1665 FLAG_SET_ERGO(bool, UseParallelGC, true);
1666 }
1667 }
1668 }
1669
1670 void Arguments::select_gc() {
1671 if (!gc_selected()) {
1672 ArgumentsExt::select_gc_ergonomically();
1673 }
1674 }
1675
1676 void Arguments::set_ergonomics_flags() {
1677 select_gc();
1678
1679 #ifdef COMPILER2
1680 // Shared spaces work fine with other GCs but causes bytecode rewriting
1681 // to be disabled, which hurts interpreter performance and decreases
1682 // server performance. When -server is specified, keep the default off
1683 // unless it is asked for. Future work: either add bytecode rewriting
1684 // at link time, or rewrite bytecodes in non-shared methods.
1685 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1686 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1687 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1688 }
1689 #endif
1690
1691 set_conservative_max_heap_alignment();
1692
1693 #ifndef ZERO
1694 #ifdef _LP64
1695 set_use_compressed_oops();
1696
1697 // set_use_compressed_klass_ptrs() must be called after calling
1698 // set_use_compressed_oops().
1699 set_use_compressed_klass_ptrs();
1700
1701 // Also checks that certain machines are slower with compressed oops
1702 // in vm_version initialization code.
1703 #endif // _LP64
1704 #endif // !ZERO
1705 }
1706
1707 void Arguments::set_parallel_gc_flags() {
1708 assert(UseParallelGC || UseParallelOldGC, "Error");
1709 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1710 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1711 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1712 }
1713 FLAG_SET_DEFAULT(UseParallelGC, true);
1714
1715 // If no heap maximum was requested explicitly, use some reasonable fraction
1716 // of the physical memory, up to a maximum of 1GB.
1717 FLAG_SET_DEFAULT(ParallelGCThreads,
1718 Abstract_VM_Version::parallel_worker_threads());
1719 if (ParallelGCThreads == 0) {
1720 jio_fprintf(defaultStream::error_stream(),
1721 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1722 vm_exit(1);
1723 }
1724
1725 if (UseAdaptiveSizePolicy) {
1726 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1727 // unless the user actually sets these flags.
1728 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1729 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1730 _min_heap_free_ratio = MinHeapFreeRatio;
1731 }
1732 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1733 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1734 _max_heap_free_ratio = MaxHeapFreeRatio;
1735 }
1736 }
1737
1738 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1739 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1740 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1741 // See CR 6362902 for details.
1742 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1743 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1744 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1745 }
1746 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1747 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1748 }
1749 }
1750
1751 if (UseParallelOldGC) {
1752 // Par compact uses lower default values since they are treated as
1753 // minimums. These are different defaults because of the different
1754 // interpretation and are not ergonomically set.
1755 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1756 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1757 }
1758 }
1759 }
1760
1761 void Arguments::set_g1_gc_flags() {
1762 assert(UseG1GC, "Error");
1763 #ifdef COMPILER1
1764 FastTLABRefill = false;
1765 #endif
1766 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1767 if (ParallelGCThreads == 0) {
1768 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1769 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1770 }
1771
1772 #if INCLUDE_ALL_GCS
1773 if (G1ConcRefinementThreads == 0) {
1774 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1775 }
1776 #endif
1777
1778 // MarkStackSize will be set (if it hasn't been set by the user)
1779 // when concurrent marking is initialized.
1780 // Its value will be based upon the number of parallel marking threads.
1781 // But we do set the maximum mark stack size here.
1782 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1783 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1784 }
1785
1786 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1787 // In G1, we want the default GC overhead goal to be higher than
1788 // say in PS. So we set it here to 10%. Otherwise the heap might
1789 // be expanded more aggressively than we would like it to. In
1790 // fact, even 10% seems to not be high enough in some cases
1791 // (especially small GC stress tests that the main thing they do
1792 // is allocation). We might consider increase it further.
1793 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1794 }
1795
1796 if (PrintGCDetails && Verbose) {
1797 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1798 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1799 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1800 }
1801 }
1802
1803 #if !INCLUDE_ALL_GCS
1804 #ifdef ASSERT
1805 static bool verify_serial_gc_flags() {
1806 return (UseSerialGC &&
1807 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1808 UseParallelGC || UseParallelOldGC));
1809 }
1810 #endif // ASSERT
1811 #endif // INCLUDE_ALL_GCS
1812
1813 void Arguments::set_gc_specific_flags() {
1814 #if INCLUDE_ALL_GCS
1815 // Set per-collector flags
1816 if (UseParallelGC || UseParallelOldGC) {
1817 set_parallel_gc_flags();
1818 } else if (UseConcMarkSweepGC) {
1819 set_cms_and_parnew_gc_flags();
1820 } else if (UseG1GC) {
1821 set_g1_gc_flags();
1822 }
1823 check_deprecated_gc_flags();
1824 if (AssumeMP && !UseSerialGC) {
1825 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1826 warning("If the number of processors is expected to increase from one, then"
1827 " you should configure the number of parallel GC threads appropriately"
1828 " using -XX:ParallelGCThreads=N");
1829 }
1830 }
1831 if (MinHeapFreeRatio == 100) {
1832 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1833 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1834 }
1835 #else // INCLUDE_ALL_GCS
1836 assert(verify_serial_gc_flags(), "SerialGC unset");
1837 #endif // INCLUDE_ALL_GCS
1838 }
1839
1840 julong Arguments::limit_by_allocatable_memory(julong limit) {
1841 julong max_allocatable;
1842 julong result = limit;
1843 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1844 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1845 }
1846 return result;
1847 }
1848
1849 // Use static initialization to get the default before parsing
1850 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1851
1852 void Arguments::set_heap_size() {
1853 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1854 // Deprecated flag
1855 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1856 }
1857
1858 const julong phys_mem =
1859 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1860 : (julong)MaxRAM;
1861
1862 // If the maximum heap size has not been set with -Xmx,
1863 // then set it as fraction of the size of physical memory,
1864 // respecting the maximum and minimum sizes of the heap.
1865 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1866 julong reasonable_max = phys_mem / MaxRAMFraction;
1867
1868 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1869 // Small physical memory, so use a minimum fraction of it for the heap
1870 reasonable_max = phys_mem / MinRAMFraction;
1871 } else {
1872 // Not-small physical memory, so require a heap at least
1873 // as large as MaxHeapSize
1874 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1875 }
1876 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1877 // Limit the heap size to ErgoHeapSizeLimit
1878 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1879 }
1880 if (UseCompressedOops) {
1881 // Limit the heap size to the maximum possible when using compressed oops
1882 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1883
1884 // HeapBaseMinAddress can be greater than default but not less than.
1885 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1886 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1887 // matches compressed oops printing flags
1888 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1889 jio_fprintf(defaultStream::error_stream(),
1890 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1891 " (" UINTX_FORMAT "G) which is greater than value given "
1892 UINTX_FORMAT "\n",
1893 DefaultHeapBaseMinAddress,
1894 DefaultHeapBaseMinAddress/G,
1895 HeapBaseMinAddress);
1896 }
1897 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1898 }
1899 }
1900
1901 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1902 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1903 // but it should be not less than default MaxHeapSize.
1904 max_coop_heap -= HeapBaseMinAddress;
1905 }
1906 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1907 }
1908 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1909
1910 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1911 // An initial heap size was specified on the command line,
1912 // so be sure that the maximum size is consistent. Done
1913 // after call to limit_by_allocatable_memory because that
1914 // method might reduce the allocation size.
1915 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1916 }
1917
1918 if (PrintGCDetails && Verbose) {
1919 // Cannot use gclog_or_tty yet.
1920 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1921 }
1922 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1923 }
1924
1925 // If the minimum or initial heap_size have not been set or requested to be set
1926 // ergonomically, set them accordingly.
1927 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1928 julong reasonable_minimum = (julong)(OldSize + NewSize);
1929
1930 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1931
1932 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1933
1934 if (InitialHeapSize == 0) {
1935 julong reasonable_initial = phys_mem / InitialRAMFraction;
1936
1937 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1938 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1939
1940 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1941
1942 if (PrintGCDetails && Verbose) {
1943 // Cannot use gclog_or_tty yet.
1944 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1945 }
1946 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1947 }
1948 // If the minimum heap size has not been set (via -Xms),
1949 // synchronize with InitialHeapSize to avoid errors with the default value.
1950 if (min_heap_size() == 0) {
1951 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1952 if (PrintGCDetails && Verbose) {
1953 // Cannot use gclog_or_tty yet.
1954 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1955 }
1956 }
1957 }
1958 }
1959
1960 // This must be called after ergonomics because we want bytecode rewriting
1961 // if the server compiler is used, or if UseSharedSpaces is disabled.
1962 void Arguments::set_bytecode_flags() {
1963 // Better not attempt to store into a read-only space.
1964 if (UseSharedSpaces) {
1965 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1966 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1967 }
1968
1969 if (!RewriteBytecodes) {
1970 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1971 }
1972 }
1973
1974 // Aggressive optimization flags -XX:+AggressiveOpts
1975 void Arguments::set_aggressive_opts_flags() {
1976 #ifdef COMPILER2
1977 if (AggressiveUnboxing) {
1978 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1979 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1980 } else if (!EliminateAutoBox) {
1981 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1982 AggressiveUnboxing = false;
1983 }
1984 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1985 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1986 } else if (!DoEscapeAnalysis) {
1987 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1988 AggressiveUnboxing = false;
1989 }
1990 }
1991 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1992 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1993 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1994 }
1995 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1996 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1997 }
1998
1999 // Feed the cache size setting into the JDK
2000 char buffer[1024];
2001 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2002 add_property(buffer);
2003 }
2004 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2005 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2006 }
2007 #endif
2008
2009 if (AggressiveOpts) {
2010 // Sample flag setting code
2011 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2012 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2013 // }
2014 }
2015 }
2016
2017 //===========================================================================================================
2018 // Parsing of java.compiler property
2019
2020 void Arguments::process_java_compiler_argument(char* arg) {
2021 // For backwards compatibility, Djava.compiler=NONE or ""
2022 // causes us to switch to -Xint mode UNLESS -Xdebug
2023 // is also specified.
2024 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2025 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2026 }
2027 }
2028
2029 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2030 _sun_java_launcher = os::strdup_check_oom(launcher);
2031 }
2032
2033 bool Arguments::created_by_java_launcher() {
2034 assert(_sun_java_launcher != NULL, "property must have value");
2035 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2036 }
2037
2038 bool Arguments::sun_java_launcher_is_altjvm() {
2039 return _sun_java_launcher_is_altjvm;
2040 }
2041
2042 //===========================================================================================================
2043 // Parsing of main arguments
2044
2045 bool Arguments::verify_interval(uintx val, uintx min,
2046 uintx max, const char* name) {
2047 // Returns true iff value is in the inclusive interval [min..max]
2048 // false, otherwise.
2049 if (val >= min && val <= max) {
2050 return true;
2051 }
2052 jio_fprintf(defaultStream::error_stream(),
2053 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2054 " and " UINTX_FORMAT "\n",
2055 name, val, min, max);
2056 return false;
2057 }
2058
2059 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2060 // Returns true if given value is at least specified min threshold
2061 // false, otherwise.
2062 if (val >= min ) {
2063 return true;
2064 }
2065 jio_fprintf(defaultStream::error_stream(),
2066 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2067 name, val, min);
2068 return false;
2069 }
2070
2071 bool Arguments::verify_percentage(uintx value, const char* name) {
2072 if (is_percentage(value)) {
2073 return true;
2074 }
2075 jio_fprintf(defaultStream::error_stream(),
2076 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2077 name, value);
2078 return false;
2079 }
2080
2081 // check if do gclog rotation
2082 // +UseGCLogFileRotation is a must,
2083 // no gc log rotation when log file not supplied or
2084 // NumberOfGCLogFiles is 0
2085 void check_gclog_consistency() {
2086 if (UseGCLogFileRotation) {
2087 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2088 jio_fprintf(defaultStream::output_stream(),
2089 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2090 "where num_of_file > 0\n"
2091 "GC log rotation is turned off\n");
2092 UseGCLogFileRotation = false;
2093 }
2094 }
2095
2096 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2097 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2098 jio_fprintf(defaultStream::output_stream(),
2099 "GCLogFileSize changed to minimum 8K\n");
2100 }
2101 }
2102
2103 // This function is called for -Xloggc:<filename>, it can be used
2104 // to check if a given file name(or string) conforms to the following
2105 // specification:
2106 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2107 // %p and %t only allowed once. We only limit usage of filename not path
2108 bool is_filename_valid(const char *file_name) {
2109 const char* p = file_name;
2110 char file_sep = os::file_separator()[0];
2111 const char* cp;
2112 // skip prefix path
2113 for (cp = file_name; *cp != '\0'; cp++) {
2114 if (*cp == '/' || *cp == file_sep) {
2115 p = cp + 1;
2116 }
2117 }
2118
2119 int count_p = 0;
2120 int count_t = 0;
2121 while (*p != '\0') {
2122 if ((*p >= '0' && *p <= '9') ||
2123 (*p >= 'A' && *p <= 'Z') ||
2124 (*p >= 'a' && *p <= 'z') ||
2125 *p == '-' ||
2126 *p == '_' ||
2127 *p == '.') {
2128 p++;
2129 continue;
2130 }
2131 if (*p == '%') {
2132 if(*(p + 1) == 'p') {
2133 p += 2;
2134 count_p ++;
2135 continue;
2136 }
2137 if (*(p + 1) == 't') {
2138 p += 2;
2139 count_t ++;
2140 continue;
2141 }
2142 }
2143 return false;
2144 }
2145 return count_p < 2 && count_t < 2;
2146 }
2147
2148 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2149 if (!is_percentage(min_heap_free_ratio)) {
2150 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2151 return false;
2152 }
2153 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2154 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2155 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2156 MaxHeapFreeRatio);
2157 return false;
2158 }
2159 // This does not set the flag itself, but stores the value in a safe place for later usage.
2160 _min_heap_free_ratio = min_heap_free_ratio;
2161 return true;
2162 }
2163
2164 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2165 if (!is_percentage(max_heap_free_ratio)) {
2166 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2167 return false;
2168 }
2169 if (max_heap_free_ratio < MinHeapFreeRatio) {
2170 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2171 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2172 MinHeapFreeRatio);
2173 return false;
2174 }
2175 // This does not set the flag itself, but stores the value in a safe place for later usage.
2176 _max_heap_free_ratio = max_heap_free_ratio;
2177 return true;
2178 }
2179
2180 // Check consistency of GC selection
2181 bool Arguments::check_gc_consistency_user() {
2182 check_gclog_consistency();
2183 // Ensure that the user has not selected conflicting sets
2184 // of collectors.
2185 uint i = 0;
2186 if (UseSerialGC) i++;
2187 if (UseConcMarkSweepGC) i++;
2188 if (UseParallelGC || UseParallelOldGC) i++;
2189 if (UseG1GC) i++;
2190 if (i > 1) {
2191 jio_fprintf(defaultStream::error_stream(),
2192 "Conflicting collector combinations in option list; "
2193 "please refer to the release notes for the combinations "
2194 "allowed\n");
2195 return false;
2196 }
2197
2198 if (UseConcMarkSweepGC && !UseParNewGC) {
2199 jio_fprintf(defaultStream::error_stream(),
2200 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2201 return false;
2202 }
2203
2204 if (UseParNewGC && !UseConcMarkSweepGC) {
2205 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2206 // set up UseSerialGC properly, so that can't be used in the check here.
2207 jio_fprintf(defaultStream::error_stream(),
2208 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2209 return false;
2210 }
2211
2212 return true;
2213 }
2214
2215 void Arguments::check_deprecated_gc_flags() {
2216 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2217 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2218 }
2219 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2220 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2221 "and will likely be removed in future release");
2222 }
2223 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2224 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2225 "Use MaxRAMFraction instead.");
2226 }
2227 }
2228
2229 // Check stack pages settings
2230 bool Arguments::check_stack_pages()
2231 {
2232 bool status = true;
2233 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2234 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2235 // greater stack shadow pages can't generate instruction to bang stack
2236 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2237 return status;
2238 }
2239
2240 // Check the consistency of vm_init_args
2241 bool Arguments::check_vm_args_consistency() {
2242 // Method for adding checks for flag consistency.
2243 // The intent is to warn the user of all possible conflicts,
2244 // before returning an error.
2245 // Note: Needs platform-dependent factoring.
2246 bool status = true;
2247
2248 if (TLABRefillWasteFraction == 0) {
2249 jio_fprintf(defaultStream::error_stream(),
2250 "TLABRefillWasteFraction should be a denominator, "
2251 "not " SIZE_FORMAT "\n",
2252 TLABRefillWasteFraction);
2253 status = false;
2254 }
2255
2256 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2257 "AdaptiveSizePolicyWeight");
2258 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2259
2260 // Divide by bucket size to prevent a large size from causing rollover when
2261 // calculating amount of memory needed to be allocated for the String table.
2262 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2263 (max_uintx / StringTable::bucket_size()), "StringTable size");
2264
2265 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2266 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2267
2268 {
2269 // Using "else if" below to avoid printing two error messages if min > max.
2270 // This will also prevent us from reporting both min>100 and max>100 at the
2271 // same time, but that is less annoying than printing two identical errors IMHO.
2272 FormatBuffer<80> err_msg("%s","");
2273 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2274 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2275 status = false;
2276 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2277 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2278 status = false;
2279 }
2280 }
2281
2282 // Min/MaxMetaspaceFreeRatio
2283 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2284 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2285
2286 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2287 jio_fprintf(defaultStream::error_stream(),
2288 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2289 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2290 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2291 MinMetaspaceFreeRatio,
2292 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2293 MaxMetaspaceFreeRatio);
2294 status = false;
2295 }
2296
2297 // Trying to keep 100% free is not practical
2298 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2299
2300 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2301 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2302 }
2303
2304 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2305 // Settings to encourage splitting.
2306 if (!FLAG_IS_CMDLINE(NewRatio)) {
2307 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2308 }
2309 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2310 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2311 }
2312 }
2313
2314 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2315 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2316 }
2317
2318 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2319 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2320 if (GCTimeLimit == 100) {
2321 // Turn off gc-overhead-limit-exceeded checks
2322 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2323 }
2324
2325 status = status && check_gc_consistency_user();
2326 status = status && check_stack_pages();
2327
2328 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2329 "CMSIncrementalSafetyFactor");
2330
2331 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2332 // insists that we hold the requisite locks so that the iteration is
2333 // MT-safe. For the verification at start-up and shut-down, we don't
2334 // yet have a good way of acquiring and releasing these locks,
2335 // which are not visible at the CollectedHeap level. We want to
2336 // be able to acquire these locks and then do the iteration rather
2337 // than just disable the lock verification. This will be fixed under
2338 // bug 4788986.
2339 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2340 if (VerifyDuringStartup) {
2341 warning("Heap verification at start-up disabled "
2342 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2343 VerifyDuringStartup = false; // Disable verification at start-up
2344 }
2345
2346 if (VerifyBeforeExit) {
2347 warning("Heap verification at shutdown disabled "
2348 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2349 VerifyBeforeExit = false; // Disable verification at shutdown
2350 }
2351 }
2352
2353 // Note: only executed in non-PRODUCT mode
2354 if (!UseAsyncConcMarkSweepGC &&
2355 (ExplicitGCInvokesConcurrent ||
2356 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2357 jio_fprintf(defaultStream::error_stream(),
2358 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2359 " with -UseAsyncConcMarkSweepGC");
2360 status = false;
2361 }
2362
2363 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2364
2365 #if INCLUDE_ALL_GCS
2366 if (UseG1GC) {
2367 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2368 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2369 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2370
2371 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2372 "InitiatingHeapOccupancyPercent");
2373 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2374 "G1RefProcDrainInterval");
2375 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2376 "G1ConcMarkStepDurationMillis");
2377 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2378 "G1ConcRSHotCardLimit");
2379 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2380 "G1ConcRSLogCacheSize");
2381 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2382 "StringDeduplicationAgeThreshold");
2383 }
2384 if (UseConcMarkSweepGC) {
2385 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2386 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2387 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2388 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2389
2390 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2391
2392 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2393 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2394 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2395
2396 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2397
2398 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2399 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2400
2401 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2402 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2403 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2404
2405 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2406
2407 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2408
2409 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2410 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2411 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2412 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2413 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2414 }
2415
2416 if (UseParallelGC || UseParallelOldGC) {
2417 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2418 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2419
2420 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2421 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2422
2423 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2424 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2425
2426 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2427
2428 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2429 }
2430 #endif // INCLUDE_ALL_GCS
2431
2432 status = status && verify_interval(RefDiscoveryPolicy,
2433 ReferenceProcessor::DiscoveryPolicyMin,
2434 ReferenceProcessor::DiscoveryPolicyMax,
2435 "RefDiscoveryPolicy");
2436
2437 // Limit the lower bound of this flag to 1 as it is used in a division
2438 // expression.
2439 status = status && verify_interval(TLABWasteTargetPercent,
2440 1, 100, "TLABWasteTargetPercent");
2441
2442 status = status && verify_object_alignment();
2443
2444 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2445 "CompressedClassSpaceSize");
2446
2447 status = status && verify_interval(MarkStackSizeMax,
2448 1, (max_jint - 1), "MarkStackSizeMax");
2449 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2450
2451 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2452
2453 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2454
2455 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2456
2457 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2458 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2459
2460 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2461
2462 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2463 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2464 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2465 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2466
2467 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2468 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2469
2470 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2471 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2472 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2473
2474 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2475 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2476
2477 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2478 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2479 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2480 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2481
2482 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2483 #ifdef COMPILER1
2484 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2485 #endif
2486
2487 if (PrintNMTStatistics) {
2488 #if INCLUDE_NMT
2489 if (MemTracker::tracking_level() == NMT_off) {
2490 #endif // INCLUDE_NMT
2491 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2492 PrintNMTStatistics = false;
2493 #if INCLUDE_NMT
2494 }
2495 #endif
2496 }
2497
2498 // Need to limit the extent of the padding to reasonable size.
2499 // 8K is well beyond the reasonable HW cache line size, even with the
2500 // aggressive prefetching, while still leaving the room for segregating
2501 // among the distinct pages.
2502 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2503 jio_fprintf(defaultStream::error_stream(),
2504 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2505 ContendedPaddingWidth, 0, 8192);
2506 status = false;
2507 }
2508
2509 // Need to enforce the padding not to break the existing field alignments.
2510 // It is sufficient to check against the largest type size.
2511 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2512 jio_fprintf(defaultStream::error_stream(),
2513 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2514 ContendedPaddingWidth, BytesPerLong);
2515 status = false;
2516 }
2517
2518 // Check lower bounds of the code cache
2519 // Template Interpreter code is approximately 3X larger in debug builds.
2520 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2521 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2524 os::vm_page_size()/K);
2525 status = false;
2526 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2527 jio_fprintf(defaultStream::error_stream(),
2528 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2529 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2530 status = false;
2531 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2534 min_code_cache_size/K);
2535 status = false;
2536 } else if (ReservedCodeCacheSize > 2*G) {
2537 // Code cache size larger than MAXINT is not supported.
2538 jio_fprintf(defaultStream::error_stream(),
2539 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2540 (2*G)/M);
2541 status = false;
2542 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2545 min_code_cache_size/K);
2546 status = false;
2547 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2548 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2549 jio_fprintf(defaultStream::error_stream(),
2550 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2551 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2552 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2553 status = false;
2554 }
2555
2556 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2557 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2558 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2559 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2560
2561
2562 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2563 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2564 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2565 // Check the minimum number of compiler threads
2566 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2567
2568 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2569 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2570 }
2571
2572 return status;
2573 }
2574
2575 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2576 const char* option_type) {
2577 if (ignore) return false;
2578
2579 const char* spacer = " ";
2580 if (option_type == NULL) {
2581 option_type = ++spacer; // Set both to the empty string.
2582 }
2583
2584 if (os::obsolete_option(option)) {
2585 jio_fprintf(defaultStream::error_stream(),
2586 "Obsolete %s%soption: %s\n", option_type, spacer,
2587 option->optionString);
2588 return false;
2589 } else {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "Unrecognized %s%soption: %s\n", option_type, spacer,
2592 option->optionString);
2593 return true;
2594 }
2595 }
2596
2597 static const char* user_assertion_options[] = {
2598 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2599 };
2600
2601 static const char* system_assertion_options[] = {
2602 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2603 };
2604
2605 bool Arguments::parse_uintx(const char* value,
2606 uintx* uintx_arg,
2607 uintx min_size) {
2608
2609 // Check the sign first since atomull() parses only unsigned values.
2610 bool value_is_positive = !(*value == '-');
2611
2612 if (value_is_positive) {
2613 julong n;
2614 bool good_return = atomull(value, &n);
2615 if (good_return) {
2616 bool above_minimum = n >= min_size;
2617 bool value_is_too_large = n > max_uintx;
2618
2619 if (above_minimum && !value_is_too_large) {
2620 *uintx_arg = n;
2621 return true;
2622 }
2623 }
2624 }
2625 return false;
2626 }
2627
2628 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2629 julong* long_arg,
2630 julong min_size) {
2631 if (!atomull(s, long_arg)) return arg_unreadable;
2632 return check_memory_size(*long_arg, min_size);
2633 }
2634
2635 // Parse JavaVMInitArgs structure
2636
2637 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2638 // For components of the system classpath.
2639 SysClassPath scp(Arguments::get_sysclasspath());
2640 bool scp_assembly_required = false;
2641
2642 // Save default settings for some mode flags
2643 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2644 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2645 Arguments::_ClipInlining = ClipInlining;
2646 Arguments::_BackgroundCompilation = BackgroundCompilation;
2647
2648 // Setup flags for mixed which is the default
2649 set_mode_flags(_mixed);
2650
2651 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2652 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2653 if (result != JNI_OK) {
2654 return result;
2655 }
2656
2657 // Parse JavaVMInitArgs structure passed in
2658 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2659 if (result != JNI_OK) {
2660 return result;
2661 }
2662
2663 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2664 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2665 if (result != JNI_OK) {
2666 return result;
2667 }
2668
2669 // Do final processing now that all arguments have been parsed
2670 result = finalize_vm_init_args(&scp, scp_assembly_required);
2671 if (result != JNI_OK) {
2672 return result;
2673 }
2674
2675 return JNI_OK;
2676 }
2677
2678 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2679 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2680 // are dealing with -agentpath (case where name is a path), otherwise with
2681 // -agentlib
2682 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2683 char *_name;
2684 const char *_hprof = "hprof", *_jdwp = "jdwp";
2685 size_t _len_hprof, _len_jdwp, _len_prefix;
2686
2687 if (is_path) {
2688 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2689 return false;
2690 }
2691
2692 _name++; // skip past last path separator
2693 _len_prefix = strlen(JNI_LIB_PREFIX);
2694
2695 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2696 return false;
2697 }
2698
2699 _name += _len_prefix;
2700 _len_hprof = strlen(_hprof);
2701 _len_jdwp = strlen(_jdwp);
2702
2703 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2704 _name += _len_hprof;
2705 }
2706 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2707 _name += _len_jdwp;
2708 }
2709 else {
2710 return false;
2711 }
2712
2713 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2714 return false;
2715 }
2716
2717 return true;
2718 }
2719
2720 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2721 return true;
2722 }
2723
2724 return false;
2725 }
2726
2727 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2728 SysClassPath* scp_p,
2729 bool* scp_assembly_required_p,
2730 Flag::Flags origin) {
2731 // Remaining part of option string
2732 const char* tail;
2733
2734 // iterate over arguments
2735 for (int index = 0; index < args->nOptions; index++) {
2736 bool is_absolute_path = false; // for -agentpath vs -agentlib
2737
2738 const JavaVMOption* option = args->options + index;
2739
2740 if (!match_option(option, "-Djava.class.path", &tail) &&
2741 !match_option(option, "-Dsun.java.command", &tail) &&
2742 !match_option(option, "-Dsun.java.launcher", &tail)) {
2743
2744 // add all jvm options to the jvm_args string. This string
2745 // is used later to set the java.vm.args PerfData string constant.
2746 // the -Djava.class.path and the -Dsun.java.command options are
2747 // omitted from jvm_args string as each have their own PerfData
2748 // string constant object.
2749 build_jvm_args(option->optionString);
2750 }
2751
2752 // -verbose:[class/gc/jni]
2753 if (match_option(option, "-verbose", &tail)) {
2754 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2755 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2756 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2757 } else if (!strcmp(tail, ":gc")) {
2758 FLAG_SET_CMDLINE(bool, PrintGC, true);
2759 } else if (!strcmp(tail, ":jni")) {
2760 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2761 }
2762 // -da / -ea / -disableassertions / -enableassertions
2763 // These accept an optional class/package name separated by a colon, e.g.,
2764 // -da:java.lang.Thread.
2765 } else if (match_option(option, user_assertion_options, &tail, true)) {
2766 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2767 if (*tail == '\0') {
2768 JavaAssertions::setUserClassDefault(enable);
2769 } else {
2770 assert(*tail == ':', "bogus match by match_option()");
2771 JavaAssertions::addOption(tail + 1, enable);
2772 }
2773 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2774 } else if (match_option(option, system_assertion_options, &tail, false)) {
2775 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2776 JavaAssertions::setSystemClassDefault(enable);
2777 // -bootclasspath:
2778 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2779 scp_p->reset_path(tail);
2780 *scp_assembly_required_p = true;
2781 // -bootclasspath/a:
2782 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2783 scp_p->add_suffix(tail);
2784 *scp_assembly_required_p = true;
2785 // -bootclasspath/p:
2786 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2787 scp_p->add_prefix(tail);
2788 *scp_assembly_required_p = true;
2789 // -Xrun
2790 } else if (match_option(option, "-Xrun", &tail)) {
2791 if (tail != NULL) {
2792 const char* pos = strchr(tail, ':');
2793 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2794 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2795 name[len] = '\0';
2796
2797 char *options = NULL;
2798 if(pos != NULL) {
2799 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2800 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2801 }
2802 #if !INCLUDE_JVMTI
2803 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "Profiling and debugging agents are not supported in this VM\n");
2806 return JNI_ERR;
2807 }
2808 #endif // !INCLUDE_JVMTI
2809 add_init_library(name, options);
2810 }
2811 // -agentlib and -agentpath
2812 } else if (match_option(option, "-agentlib:", &tail) ||
2813 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2814 if(tail != NULL) {
2815 const char* pos = strchr(tail, '=');
2816 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2817 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2818 name[len] = '\0';
2819
2820 char *options = NULL;
2821 if(pos != NULL) {
2822 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2823 }
2824 #if !INCLUDE_JVMTI
2825 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Profiling and debugging agents are not supported in this VM\n");
2828 return JNI_ERR;
2829 }
2830 #endif // !INCLUDE_JVMTI
2831 add_init_agent(name, options, is_absolute_path);
2832 }
2833 // -javaagent
2834 } else if (match_option(option, "-javaagent:", &tail)) {
2835 #if !INCLUDE_JVMTI
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Instrumentation agents are not supported in this VM\n");
2838 return JNI_ERR;
2839 #else
2840 if(tail != NULL) {
2841 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2842 add_init_agent("instrument", options, false);
2843 }
2844 #endif // !INCLUDE_JVMTI
2845 // -Xnoclassgc
2846 } else if (match_option(option, "-Xnoclassgc")) {
2847 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2848 // -Xconcgc
2849 } else if (match_option(option, "-Xconcgc")) {
2850 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2851 // -Xnoconcgc
2852 } else if (match_option(option, "-Xnoconcgc")) {
2853 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2854 // -Xbatch
2855 } else if (match_option(option, "-Xbatch")) {
2856 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2857 // -Xmn for compatibility with other JVM vendors
2858 } else if (match_option(option, "-Xmn", &tail)) {
2859 julong long_initial_young_size = 0;
2860 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid initial young generation size: %s\n", option->optionString);
2864 describe_range_error(errcode);
2865 return JNI_EINVAL;
2866 }
2867 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2868 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2869 // -Xms
2870 } else if (match_option(option, "-Xms", &tail)) {
2871 julong long_initial_heap_size = 0;
2872 // an initial heap size of 0 means automatically determine
2873 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid initial heap size: %s\n", option->optionString);
2877 describe_range_error(errcode);
2878 return JNI_EINVAL;
2879 }
2880 set_min_heap_size((uintx)long_initial_heap_size);
2881 // Currently the minimum size and the initial heap sizes are the same.
2882 // Can be overridden with -XX:InitialHeapSize.
2883 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2884 // -Xmx
2885 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2886 julong long_max_heap_size = 0;
2887 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2888 if (errcode != arg_in_range) {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Invalid maximum heap size: %s\n", option->optionString);
2891 describe_range_error(errcode);
2892 return JNI_EINVAL;
2893 }
2894 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2895 // Xmaxf
2896 } else if (match_option(option, "-Xmaxf", &tail)) {
2897 char* err;
2898 int maxf = (int)(strtod(tail, &err) * 100);
2899 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Bad max heap free percentage size: %s\n",
2902 option->optionString);
2903 return JNI_EINVAL;
2904 } else {
2905 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2906 }
2907 // Xminf
2908 } else if (match_option(option, "-Xminf", &tail)) {
2909 char* err;
2910 int minf = (int)(strtod(tail, &err) * 100);
2911 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Bad min heap free percentage size: %s\n",
2914 option->optionString);
2915 return JNI_EINVAL;
2916 } else {
2917 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2918 }
2919 // -Xss
2920 } else if (match_option(option, "-Xss", &tail)) {
2921 julong long_ThreadStackSize = 0;
2922 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2923 if (errcode != arg_in_range) {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Invalid thread stack size: %s\n", option->optionString);
2926 describe_range_error(errcode);
2927 return JNI_EINVAL;
2928 }
2929 // Internally track ThreadStackSize in units of 1024 bytes.
2930 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2931 round_to((int)long_ThreadStackSize, K) / K);
2932 // -Xoss
2933 } else if (match_option(option, "-Xoss", &tail)) {
2934 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2935 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2936 julong long_CodeCacheExpansionSize = 0;
2937 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2938 if (errcode != arg_in_range) {
2939 jio_fprintf(defaultStream::error_stream(),
2940 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2941 os::vm_page_size()/K);
2942 return JNI_EINVAL;
2943 }
2944 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2945 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2946 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2947 julong long_ReservedCodeCacheSize = 0;
2948
2949 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2950 if (errcode != arg_in_range) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Invalid maximum code cache size: %s.\n", option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2956 // -XX:NonNMethodCodeHeapSize=
2957 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2958 julong long_NonNMethodCodeHeapSize = 0;
2959
2960 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2961 if (errcode != arg_in_range) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2964 return JNI_EINVAL;
2965 }
2966 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2967 // -XX:ProfiledCodeHeapSize=
2968 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2969 julong long_ProfiledCodeHeapSize = 0;
2970
2971 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2972 if (errcode != arg_in_range) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2975 return JNI_EINVAL;
2976 }
2977 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2978 // -XX:NonProfiledCodeHeapSizee=
2979 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2980 julong long_NonProfiledCodeHeapSize = 0;
2981
2982 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2983 if (errcode != arg_in_range) {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2986 return JNI_EINVAL;
2987 }
2988 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2989 //-XX:IncreaseFirstTierCompileThresholdAt=
2990 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2991 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2992 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2993 jio_fprintf(defaultStream::error_stream(),
2994 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2995 option->optionString);
2996 return JNI_EINVAL;
2997 }
2998 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2999 // -green
3000 } else if (match_option(option, "-green")) {
3001 jio_fprintf(defaultStream::error_stream(),
3002 "Green threads support not available\n");
3003 return JNI_EINVAL;
3004 // -native
3005 } else if (match_option(option, "-native")) {
3006 // HotSpot always uses native threads, ignore silently for compatibility
3007 // -Xsqnopause
3008 } else if (match_option(option, "-Xsqnopause")) {
3009 // EVM option, ignore silently for compatibility
3010 // -Xrs
3011 } else if (match_option(option, "-Xrs")) {
3012 // Classic/EVM option, new functionality
3013 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3014 } else if (match_option(option, "-Xusealtsigs")) {
3015 // change default internal VM signals used - lower case for back compat
3016 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3017 // -Xoptimize
3018 } else if (match_option(option, "-Xoptimize")) {
3019 // EVM option, ignore silently for compatibility
3020 // -Xprof
3021 } else if (match_option(option, "-Xprof")) {
3022 #if INCLUDE_FPROF
3023 _has_profile = true;
3024 #else // INCLUDE_FPROF
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Flat profiling is not supported in this VM.\n");
3027 return JNI_ERR;
3028 #endif // INCLUDE_FPROF
3029 // -Xconcurrentio
3030 } else if (match_option(option, "-Xconcurrentio")) {
3031 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3032 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3033 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3034 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3035 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3036
3037 // -Xinternalversion
3038 } else if (match_option(option, "-Xinternalversion")) {
3039 jio_fprintf(defaultStream::output_stream(), "%s\n",
3040 VM_Version::internal_vm_info_string());
3041 vm_exit(0);
3042 #ifndef PRODUCT
3043 // -Xprintflags
3044 } else if (match_option(option, "-Xprintflags")) {
3045 CommandLineFlags::printFlags(tty, false);
3046 vm_exit(0);
3047 #endif
3048 // -D
3049 } else if (match_option(option, "-D", &tail)) {
3050 if (!add_property(tail)) {
3051 return JNI_ENOMEM;
3052 }
3053 // Out of the box management support
3054 if (match_option(option, "-Dcom.sun.management", &tail)) {
3055 #if INCLUDE_MANAGEMENT
3056 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3057 #else
3058 jio_fprintf(defaultStream::output_stream(),
3059 "-Dcom.sun.management is not supported in this VM.\n");
3060 return JNI_ERR;
3061 #endif
3062 }
3063 // -Xint
3064 } else if (match_option(option, "-Xint")) {
3065 set_mode_flags(_int);
3066 // -Xmixed
3067 } else if (match_option(option, "-Xmixed")) {
3068 set_mode_flags(_mixed);
3069 // -Xcomp
3070 } else if (match_option(option, "-Xcomp")) {
3071 // for testing the compiler; turn off all flags that inhibit compilation
3072 set_mode_flags(_comp);
3073 // -Xshare:dump
3074 } else if (match_option(option, "-Xshare:dump")) {
3075 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3076 set_mode_flags(_int); // Prevent compilation, which creates objects
3077 // -Xshare:on
3078 } else if (match_option(option, "-Xshare:on")) {
3079 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3080 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3081 // -Xshare:auto
3082 } else if (match_option(option, "-Xshare:auto")) {
3083 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3084 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3085 // -Xshare:off
3086 } else if (match_option(option, "-Xshare:off")) {
3087 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3088 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3089 // -Xverify
3090 } else if (match_option(option, "-Xverify", &tail)) {
3091 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3092 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3093 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3094 } else if (strcmp(tail, ":remote") == 0) {
3095 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3096 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3097 } else if (strcmp(tail, ":none") == 0) {
3098 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3099 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3100 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3101 return JNI_EINVAL;
3102 }
3103 // -Xdebug
3104 } else if (match_option(option, "-Xdebug")) {
3105 // note this flag has been used, then ignore
3106 set_xdebug_mode(true);
3107 // -Xnoagent
3108 } else if (match_option(option, "-Xnoagent")) {
3109 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3110 } else if (match_option(option, "-Xboundthreads")) {
3111 // Bind user level threads to kernel threads (Solaris only)
3112 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3113 } else if (match_option(option, "-Xloggc:", &tail)) {
3114 // Redirect GC output to the file. -Xloggc:<filename>
3115 // ostream_init_log(), when called will use this filename
3116 // to initialize a fileStream.
3117 _gc_log_filename = os::strdup_check_oom(tail);
3118 if (!is_filename_valid(_gc_log_filename)) {
3119 jio_fprintf(defaultStream::output_stream(),
3120 "Invalid file name for use with -Xloggc: Filename can only contain the "
3121 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3122 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3123 return JNI_EINVAL;
3124 }
3125 FLAG_SET_CMDLINE(bool, PrintGC, true);
3126 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3127
3128 // JNI hooks
3129 } else if (match_option(option, "-Xcheck", &tail)) {
3130 if (!strcmp(tail, ":jni")) {
3131 #if !INCLUDE_JNI_CHECK
3132 warning("JNI CHECKING is not supported in this VM");
3133 #else
3134 CheckJNICalls = true;
3135 #endif // INCLUDE_JNI_CHECK
3136 } else if (is_bad_option(option, args->ignoreUnrecognized,
3137 "check")) {
3138 return JNI_EINVAL;
3139 }
3140 } else if (match_option(option, "vfprintf")) {
3141 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3142 } else if (match_option(option, "exit")) {
3143 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3144 } else if (match_option(option, "abort")) {
3145 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3146 // -XX:+AggressiveHeap
3147 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3148
3149 // This option inspects the machine and attempts to set various
3150 // parameters to be optimal for long-running, memory allocation
3151 // intensive jobs. It is intended for machines with large
3152 // amounts of cpu and memory.
3153
3154 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3155 // VM, but we may not be able to represent the total physical memory
3156 // available (like having 8gb of memory on a box but using a 32bit VM).
3157 // Thus, we need to make sure we're using a julong for intermediate
3158 // calculations.
3159 julong initHeapSize;
3160 julong total_memory = os::physical_memory();
3161
3162 if (total_memory < (julong)256*M) {
3163 jio_fprintf(defaultStream::error_stream(),
3164 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3165 vm_exit(1);
3166 }
3167
3168 // The heap size is half of available memory, or (at most)
3169 // all of possible memory less 160mb (leaving room for the OS
3170 // when using ISM). This is the maximum; because adaptive sizing
3171 // is turned on below, the actual space used may be smaller.
3172
3173 initHeapSize = MIN2(total_memory / (julong)2,
3174 total_memory - (julong)160*M);
3175
3176 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3177
3178 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3179 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3180 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3181 // Currently the minimum size and the initial heap sizes are the same.
3182 set_min_heap_size(initHeapSize);
3183 }
3184 if (FLAG_IS_DEFAULT(NewSize)) {
3185 // Make the young generation 3/8ths of the total heap.
3186 FLAG_SET_CMDLINE(uintx, NewSize,
3187 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3188 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3189 }
3190
3191 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3192 FLAG_SET_DEFAULT(UseLargePages, true);
3193 #endif
3194
3195 // Increase some data structure sizes for efficiency
3196 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3197 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3198 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3199
3200 // See the OldPLABSize comment below, but replace 'after promotion'
3201 // with 'after copying'. YoungPLABSize is the size of the survivor
3202 // space per-gc-thread buffers. The default is 4kw.
3203 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3204
3205 // OldPLABSize is the size of the buffers in the old gen that
3206 // UseParallelGC uses to promote live data that doesn't fit in the
3207 // survivor spaces. At any given time, there's one for each gc thread.
3208 // The default size is 1kw. These buffers are rarely used, since the
3209 // survivor spaces are usually big enough. For specjbb, however, there
3210 // are occasions when there's lots of live data in the young gen
3211 // and we end up promoting some of it. We don't have a definite
3212 // explanation for why bumping OldPLABSize helps, but the theory
3213 // is that a bigger PLAB results in retaining something like the
3214 // original allocation order after promotion, which improves mutator
3215 // locality. A minor effect may be that larger PLABs reduce the
3216 // number of PLAB allocation events during gc. The value of 8kw
3217 // was arrived at by experimenting with specjbb.
3218 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3219
3220 // Enable parallel GC and adaptive generation sizing
3221 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3222 FLAG_SET_DEFAULT(ParallelGCThreads,
3223 Abstract_VM_Version::parallel_worker_threads());
3224
3225 // Encourage steady state memory management
3226 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3227
3228 // This appears to improve mutator locality
3229 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3230
3231 // Get around early Solaris scheduling bug
3232 // (affinity vs other jobs on system)
3233 // but disallow DR and offlining (5008695).
3234 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3235
3236 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3237 // and the last option wins.
3238 } else if (match_option(option, "-XX:+NeverTenure")) {
3239 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3240 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3241 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3242 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3243 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3244 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3245 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3246 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3247 uintx max_tenuring_thresh = 0;
3248 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3249 jio_fprintf(defaultStream::error_stream(),
3250 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3251 }
3252 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3253
3254 if (MaxTenuringThreshold == 0) {
3255 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3256 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3257 } else {
3258 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3259 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3260 }
3261 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled") ||
3262 match_option(option, "-XX:-CMSPermGenSweepingEnabled")) {
3263 jio_fprintf(defaultStream::error_stream(),
3264 "Please use CMSClassUnloadingEnabled in place of "
3265 "CMSPermGenSweepingEnabled in the future\n");
3266 } else if (match_option(option, "-XX:+UseGCTimeLimit")) {
3267 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3268 jio_fprintf(defaultStream::error_stream(),
3269 "Please use -XX:+UseGCOverheadLimit in place of "
3270 "-XX:+UseGCTimeLimit in the future\n");
3271 } else if (match_option(option, "-XX:-UseGCTimeLimit")) {
3272 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Please use -XX:-UseGCOverheadLimit in place of "
3275 "-XX:-UseGCTimeLimit in the future\n");
3276 // The TLE options are for compatibility with 1.3 and will be
3277 // removed without notice in a future release. These options
3278 // are not to be documented.
3279 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3280 // No longer used.
3281 } else if (match_option(option, "-XX:+ResizeTLE")) {
3282 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3283 } else if (match_option(option, "-XX:-ResizeTLE")) {
3284 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3285 } else if (match_option(option, "-XX:+PrintTLE")) {
3286 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3287 } else if (match_option(option, "-XX:-PrintTLE")) {
3288 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3289 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3290 // No longer used.
3291 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3292 julong long_tlab_size = 0;
3293 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3294 if (errcode != arg_in_range) {
3295 jio_fprintf(defaultStream::error_stream(),
3296 "Invalid TLAB size: %s\n", option->optionString);
3297 describe_range_error(errcode);
3298 return JNI_EINVAL;
3299 }
3300 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3301 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3302 // No longer used.
3303 } else if (match_option(option, "-XX:+UseTLE")) {
3304 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3305 } else if (match_option(option, "-XX:-UseTLE")) {
3306 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3307 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3308 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3309 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3310 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3311 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3312 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3313 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3314 #if defined(DTRACE_ENABLED)
3315 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3316 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3317 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3318 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3319 #else // defined(DTRACE_ENABLED)
3320 jio_fprintf(defaultStream::error_stream(),
3321 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3322 return JNI_EINVAL;
3323 #endif // defined(DTRACE_ENABLED)
3324 #ifdef ASSERT
3325 } else if (match_option(option, "-XX:+FullGCALot")) {
3326 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3327 // disable scavenge before parallel mark-compact
3328 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3329 #endif
3330 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3331 julong cms_blocks_to_claim = (julong)atol(tail);
3332 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3333 jio_fprintf(defaultStream::error_stream(),
3334 "Please use -XX:OldPLABSize in place of "
3335 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3336 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3337 julong cms_blocks_to_claim = (julong)atol(tail);
3338 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3339 jio_fprintf(defaultStream::error_stream(),
3340 "Please use -XX:OldPLABSize in place of "
3341 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3342 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3343 julong old_plab_size = 0;
3344 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3345 if (errcode != arg_in_range) {
3346 jio_fprintf(defaultStream::error_stream(),
3347 "Invalid old PLAB size: %s\n", option->optionString);
3348 describe_range_error(errcode);
3349 return JNI_EINVAL;
3350 }
3351 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3352 jio_fprintf(defaultStream::error_stream(),
3353 "Please use -XX:OldPLABSize in place of "
3354 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3355 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3356 julong young_plab_size = 0;
3357 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3358 if (errcode != arg_in_range) {
3359 jio_fprintf(defaultStream::error_stream(),
3360 "Invalid young PLAB size: %s\n", option->optionString);
3361 describe_range_error(errcode);
3362 return JNI_EINVAL;
3363 }
3364 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Please use -XX:YoungPLABSize in place of "
3367 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3368 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3369 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3370 julong stack_size = 0;
3371 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3372 if (errcode != arg_in_range) {
3373 jio_fprintf(defaultStream::error_stream(),
3374 "Invalid mark stack size: %s\n", option->optionString);
3375 describe_range_error(errcode);
3376 return JNI_EINVAL;
3377 }
3378 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3379 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3380 julong max_stack_size = 0;
3381 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3382 if (errcode != arg_in_range) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Invalid maximum mark stack size: %s\n",
3385 option->optionString);
3386 describe_range_error(errcode);
3387 return JNI_EINVAL;
3388 }
3389 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3390 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3391 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3392 uintx conc_threads = 0;
3393 if (!parse_uintx(tail, &conc_threads, 1)) {
3394 jio_fprintf(defaultStream::error_stream(),
3395 "Invalid concurrent threads: %s\n", option->optionString);
3396 return JNI_EINVAL;
3397 }
3398 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3399 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3400 julong max_direct_memory_size = 0;
3401 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3402 if (errcode != arg_in_range) {
3403 jio_fprintf(defaultStream::error_stream(),
3404 "Invalid maximum direct memory size: %s\n",
3405 option->optionString);
3406 describe_range_error(errcode);
3407 return JNI_EINVAL;
3408 }
3409 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3410 #if !INCLUDE_MANAGEMENT
3411 } else if (match_option(option, "-XX:+ManagementServer")) {
3412 jio_fprintf(defaultStream::error_stream(),
3413 "ManagementServer is not supported in this VM.\n");
3414 return JNI_ERR;
3415 #endif // INCLUDE_MANAGEMENT
3416 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3417 // Skip -XX:Flags= since that case has already been handled
3418 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3419 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3420 return JNI_EINVAL;
3421 }
3422 }
3423 // Unknown option
3424 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3425 return JNI_ERR;
3426 }
3427 }
3428
3429 // PrintSharedArchiveAndExit will turn on
3430 // -Xshare:on
3431 // -XX:+TraceClassPaths
3432 if (PrintSharedArchiveAndExit) {
3433 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3434 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3435 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3436 }
3437
3438 // Change the default value for flags which have different default values
3439 // when working with older JDKs.
3440 #ifdef LINUX
3441 if (JDK_Version::current().compare_major(6) <= 0 &&
3442 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3443 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3444 }
3445 #endif // LINUX
3446 fix_appclasspath();
3447 return JNI_OK;
3448 }
3449
3450 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3451 //
3452 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3453 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3454 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3455 // path is treated as the current directory.
3456 //
3457 // This causes problems with CDS, which requires that all directories specified in the classpath
3458 // must be empty. In most cases, applications do NOT want to load classes from the current
3459 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3460 // scripts compatible with CDS.
3461 void Arguments::fix_appclasspath() {
3462 if (IgnoreEmptyClassPaths) {
3463 const char separator = *os::path_separator();
3464 const char* src = _java_class_path->value();
3465
3466 // skip over all the leading empty paths
3467 while (*src == separator) {
3468 src ++;
3469 }
3470
3471 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3472 strncpy(copy, src, strlen(src) + 1);
3473
3474 // trim all trailing empty paths
3475 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3476 *tail = '\0';
3477 }
3478
3479 char from[3] = {separator, separator, '\0'};
3480 char to [2] = {separator, '\0'};
3481 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3482 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3483 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3484 }
3485
3486 _java_class_path->set_value(copy);
3487 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3488 }
3489
3490 if (!PrintSharedArchiveAndExit) {
3491 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3492 }
3493 }
3494
3495 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3496 // This must be done after all -D arguments have been processed.
3497 scp_p->expand_endorsed();
3498
3499 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3500 // Assemble the bootclasspath elements into the final path.
3501 Arguments::set_sysclasspath(scp_p->combined_path());
3502 }
3503
3504 // This must be done after all arguments have been processed.
3505 // java_compiler() true means set to "NONE" or empty.
3506 if (java_compiler() && !xdebug_mode()) {
3507 // For backwards compatibility, we switch to interpreted mode if
3508 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3509 // not specified.
3510 set_mode_flags(_int);
3511 }
3512
3513 if ((TieredCompilation && CompileThresholdScaling == 0)
3514 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3515 set_mode_flags(_int);
3516 }
3517
3518 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3519 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3520 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3521 }
3522
3523 #ifndef COMPILER2
3524 // Don't degrade server performance for footprint
3525 if (FLAG_IS_DEFAULT(UseLargePages) &&
3526 MaxHeapSize < LargePageHeapSizeThreshold) {
3527 // No need for large granularity pages w/small heaps.
3528 // Note that large pages are enabled/disabled for both the
3529 // Java heap and the code cache.
3530 FLAG_SET_DEFAULT(UseLargePages, false);
3531 }
3532
3533 #else
3534 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3535 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3536 }
3537 #endif
3538
3539 #ifndef TIERED
3540 // Tiered compilation is undefined.
3541 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3542 #endif
3543
3544 // If we are running in a headless jre, force java.awt.headless property
3545 // to be true unless the property has already been set.
3546 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3547 if (os::is_headless_jre()) {
3548 const char* headless = Arguments::get_property("java.awt.headless");
3549 if (headless == NULL) {
3550 char envbuffer[128];
3551 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3552 if (!add_property("java.awt.headless=true")) {
3553 return JNI_ENOMEM;
3554 }
3555 } else {
3556 char buffer[256];
3557 strcpy(buffer, "java.awt.headless=");
3558 strcat(buffer, envbuffer);
3559 if (!add_property(buffer)) {
3560 return JNI_ENOMEM;
3561 }
3562 }
3563 }
3564 }
3565
3566 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3567 // CMS can only be used with ParNew
3568 FLAG_SET_ERGO(bool, UseParNewGC, true);
3569 }
3570
3571 if (!check_vm_args_consistency()) {
3572 return JNI_ERR;
3573 }
3574
3575 return JNI_OK;
3576 }
3577
3578 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3579 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3580 scp_assembly_required_p);
3581 }
3582
3583 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3584 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3585 scp_assembly_required_p);
3586 }
3587
3588 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3589 const int N_MAX_OPTIONS = 64;
3590 const int OPTION_BUFFER_SIZE = 1024;
3591 char buffer[OPTION_BUFFER_SIZE];
3592
3593 // The variable will be ignored if it exceeds the length of the buffer.
3594 // Don't check this variable if user has special privileges
3595 // (e.g. unix su command).
3596 if (os::getenv(name, buffer, sizeof(buffer)) &&
3597 !os::have_special_privileges()) {
3598 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3599 jio_fprintf(defaultStream::error_stream(),
3600 "Picked up %s: %s\n", name, buffer);
3601 char* rd = buffer; // pointer to the input string (rd)
3602 int i;
3603 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3604 while (isspace(*rd)) rd++; // skip whitespace
3605 if (*rd == 0) break; // we re done when the input string is read completely
3606
3607 // The output, option string, overwrites the input string.
3608 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3609 // input string (rd).
3610 char* wrt = rd;
3611
3612 options[i++].optionString = wrt; // Fill in option
3613 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3614 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3615 int quote = *rd; // matching quote to look for
3616 rd++; // don't copy open quote
3617 while (*rd != quote) { // include everything (even spaces) up until quote
3618 if (*rd == 0) { // string termination means unmatched string
3619 jio_fprintf(defaultStream::error_stream(),
3620 "Unmatched quote in %s\n", name);
3621 return JNI_ERR;
3622 }
3623 *wrt++ = *rd++; // copy to option string
3624 }
3625 rd++; // don't copy close quote
3626 } else {
3627 *wrt++ = *rd++; // copy to option string
3628 }
3629 }
3630 // Need to check if we're done before writing a NULL,
3631 // because the write could be to the byte that rd is pointing to.
3632 if (*rd++ == 0) {
3633 *wrt = 0;
3634 break;
3635 }
3636 *wrt = 0; // Zero terminate option
3637 }
3638 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3639 JavaVMInitArgs vm_args;
3640 vm_args.version = JNI_VERSION_1_2;
3641 vm_args.options = options;
3642 vm_args.nOptions = i;
3643 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3644
3645 if (PrintVMOptions) {
3646 const char* tail;
3647 for (int i = 0; i < vm_args.nOptions; i++) {
3648 const JavaVMOption *option = vm_args.options + i;
3649 if (match_option(option, "-XX:", &tail)) {
3650 logOption(tail);
3651 }
3652 }
3653 }
3654
3655 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3656 }
3657 return JNI_OK;
3658 }
3659
3660 void Arguments::set_shared_spaces_flags() {
3661 if (DumpSharedSpaces) {
3662 if (RequireSharedSpaces) {
3663 warning("cannot dump shared archive while using shared archive");
3664 }
3665 UseSharedSpaces = false;
3666 #ifdef _LP64
3667 if (!UseCompressedOops || !UseCompressedClassPointers) {
3668 vm_exit_during_initialization(
3669 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3670 }
3671 } else {
3672 if (!UseCompressedOops || !UseCompressedClassPointers) {
3673 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3674 }
3675 #endif
3676 }
3677 }
3678
3679 #if !INCLUDE_ALL_GCS
3680 static void force_serial_gc() {
3681 FLAG_SET_DEFAULT(UseSerialGC, true);
3682 UNSUPPORTED_GC_OPTION(UseG1GC);
3683 UNSUPPORTED_GC_OPTION(UseParallelGC);
3684 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3685 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3686 UNSUPPORTED_GC_OPTION(UseParNewGC);
3687 }
3688 #endif // INCLUDE_ALL_GCS
3689
3690 // Sharing support
3691 // Construct the path to the archive
3692 static char* get_shared_archive_path() {
3693 char *shared_archive_path;
3694 if (SharedArchiveFile == NULL) {
3695 char jvm_path[JVM_MAXPATHLEN];
3696 os::jvm_path(jvm_path, sizeof(jvm_path));
3697 char *end = strrchr(jvm_path, *os::file_separator());
3698 if (end != NULL) *end = '\0';
3699 size_t jvm_path_len = strlen(jvm_path);
3700 size_t file_sep_len = strlen(os::file_separator());
3701 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3702 file_sep_len + 20, mtInternal);
3703 if (shared_archive_path != NULL) {
3704 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3705 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3706 strncat(shared_archive_path, "classes.jsa", 11);
3707 }
3708 } else {
3709 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3710 if (shared_archive_path != NULL) {
3711 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3712 }
3713 }
3714 return shared_archive_path;
3715 }
3716
3717 #ifndef PRODUCT
3718 // Determine whether LogVMOutput should be implicitly turned on.
3719 static bool use_vm_log() {
3720 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3721 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3722 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3723 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3724 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3725 return true;
3726 }
3727
3728 #ifdef COMPILER1
3729 if (PrintC1Statistics) {
3730 return true;
3731 }
3732 #endif // COMPILER1
3733
3734 #ifdef COMPILER2
3735 if (PrintOptoAssembly || PrintOptoStatistics) {
3736 return true;
3737 }
3738 #endif // COMPILER2
3739
3740 return false;
3741 }
3742 #endif // PRODUCT
3743
3744 // Parse entry point called from JNI_CreateJavaVM
3745
3746 jint Arguments::parse(const JavaVMInitArgs* args) {
3747
3748 // Remaining part of option string
3749 const char* tail;
3750
3751 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3752 const char* hotspotrc = ".hotspotrc";
3753 bool settings_file_specified = false;
3754 bool needs_hotspotrc_warning = false;
3755
3756 const char* flags_file;
3757 int index;
3758 for (index = 0; index < args->nOptions; index++) {
3759 const JavaVMOption *option = args->options + index;
3760 if (ArgumentsExt::process_options(option)) {
3761 continue;
3762 }
3763 if (match_option(option, "-XX:Flags=", &tail)) {
3764 flags_file = tail;
3765 settings_file_specified = true;
3766 continue;
3767 }
3768 if (match_option(option, "-XX:+PrintVMOptions")) {
3769 PrintVMOptions = true;
3770 continue;
3771 }
3772 if (match_option(option, "-XX:-PrintVMOptions")) {
3773 PrintVMOptions = false;
3774 continue;
3775 }
3776 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3777 IgnoreUnrecognizedVMOptions = true;
3778 continue;
3779 }
3780 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3781 IgnoreUnrecognizedVMOptions = false;
3782 continue;
3783 }
3784 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3785 CommandLineFlags::printFlags(tty, false);
3786 vm_exit(0);
3787 }
3788 #if INCLUDE_NMT
3789 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3790 // The launcher did not setup nmt environment variable properly.
3791 if (!MemTracker::check_launcher_nmt_support(tail)) {
3792 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3793 }
3794
3795 // Verify if nmt option is valid.
3796 if (MemTracker::verify_nmt_option()) {
3797 // Late initialization, still in single-threaded mode.
3798 if (MemTracker::tracking_level() >= NMT_summary) {
3799 MemTracker::init();
3800 }
3801 } else {
3802 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3803 }
3804 continue;
3805 }
3806 #endif
3807
3808
3809 #ifndef PRODUCT
3810 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3811 CommandLineFlags::printFlags(tty, true);
3812 vm_exit(0);
3813 }
3814 #endif
3815 }
3816
3817 if (IgnoreUnrecognizedVMOptions) {
3818 // uncast const to modify the flag args->ignoreUnrecognized
3819 *(jboolean*)(&args->ignoreUnrecognized) = true;
3820 }
3821
3822 // Parse specified settings file
3823 if (settings_file_specified) {
3824 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3825 return JNI_EINVAL;
3826 }
3827 } else {
3828 #ifdef ASSERT
3829 // Parse default .hotspotrc settings file
3830 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3831 return JNI_EINVAL;
3832 }
3833 #else
3834 struct stat buf;
3835 if (os::stat(hotspotrc, &buf) == 0) {
3836 needs_hotspotrc_warning = true;
3837 }
3838 #endif
3839 }
3840
3841 if (PrintVMOptions) {
3842 for (index = 0; index < args->nOptions; index++) {
3843 const JavaVMOption *option = args->options + index;
3844 if (match_option(option, "-XX:", &tail)) {
3845 logOption(tail);
3846 }
3847 }
3848 }
3849
3850 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3851 jint result = parse_vm_init_args(args);
3852 if (result != JNI_OK) {
3853 return result;
3854 }
3855
3856 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3857 SharedArchivePath = get_shared_archive_path();
3858 if (SharedArchivePath == NULL) {
3859 return JNI_ENOMEM;
3860 }
3861
3862 // Set up VerifySharedSpaces
3863 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3864 VerifySharedSpaces = true;
3865 }
3866
3867 // Delay warning until here so that we've had a chance to process
3868 // the -XX:-PrintWarnings flag
3869 if (needs_hotspotrc_warning) {
3870 warning("%s file is present but has been ignored. "
3871 "Run with -XX:Flags=%s to load the file.",
3872 hotspotrc, hotspotrc);
3873 }
3874
3875 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3876 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3877 #endif
3878
3879 #if INCLUDE_ALL_GCS
3880 #if (defined JAVASE_EMBEDDED || defined ARM)
3881 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3882 #endif
3883 #endif
3884
3885 #ifndef PRODUCT
3886 if (TraceBytecodesAt != 0) {
3887 TraceBytecodes = true;
3888 }
3889 if (CountCompiledCalls) {
3890 if (UseCounterDecay) {
3891 warning("UseCounterDecay disabled because CountCalls is set");
3892 UseCounterDecay = false;
3893 }
3894 }
3895 #endif // PRODUCT
3896
3897 if (ScavengeRootsInCode == 0) {
3898 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3899 warning("forcing ScavengeRootsInCode non-zero");
3900 }
3901 ScavengeRootsInCode = 1;
3902 }
3903
3904 if (PrintGCDetails) {
3905 // Turn on -verbose:gc options as well
3906 PrintGC = true;
3907 }
3908
3909 // Set object alignment values.
3910 set_object_alignment();
3911
3912 #if !INCLUDE_ALL_GCS
3913 force_serial_gc();
3914 #endif // INCLUDE_ALL_GCS
3915 #if !INCLUDE_CDS
3916 if (DumpSharedSpaces || RequireSharedSpaces) {
3917 jio_fprintf(defaultStream::error_stream(),
3918 "Shared spaces are not supported in this VM\n");
3919 return JNI_ERR;
3920 }
3921 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3922 warning("Shared spaces are not supported in this VM");
3923 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3924 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3925 }
3926 no_shared_spaces("CDS Disabled");
3927 #endif // INCLUDE_CDS
3928
3929 return JNI_OK;
3930 }
3931
3932 jint Arguments::apply_ergo() {
3933
3934 // Set flags based on ergonomics.
3935 set_ergonomics_flags();
3936
3937 set_shared_spaces_flags();
3938
3939 // Check the GC selections again.
3940 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3941 return JNI_EINVAL;
3942 }
3943
3944 if (TieredCompilation) {
3945 set_tiered_flags();
3946 } else {
3947 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3948 if (CompilationPolicyChoice >= 2) {
3949 vm_exit_during_initialization(
3950 "Incompatible compilation policy selected", NULL);
3951 }
3952 // Scale CompileThreshold
3953 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3954 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3955 }
3956 }
3957
3958 #ifdef COMPILER2
3959 #ifndef PRODUCT
3960 if (PrintIdealGraphLevel > 0) {
3961 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3962 }
3963 #endif
3964 #endif
3965
3966 // Set heap size based on available physical memory
3967 set_heap_size();
3968
3969 ArgumentsExt::set_gc_specific_flags();
3970
3971 // Initialize Metaspace flags and alignments
3972 Metaspace::ergo_initialize();
3973
3974 // Set bytecode rewriting flags
3975 set_bytecode_flags();
3976
3977 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3978 set_aggressive_opts_flags();
3979
3980 // Turn off biased locking for locking debug mode flags,
3981 // which are subtly different from each other but neither works with
3982 // biased locking
3983 if (UseHeavyMonitors
3984 #ifdef COMPILER1
3985 || !UseFastLocking
3986 #endif // COMPILER1
3987 ) {
3988 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3989 // flag set to true on command line; warn the user that they
3990 // can't enable biased locking here
3991 warning("Biased Locking is not supported with locking debug flags"
3992 "; ignoring UseBiasedLocking flag." );
3993 }
3994 UseBiasedLocking = false;
3995 }
3996
3997 #ifdef ZERO
3998 // Clear flags not supported on zero.
3999 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4000 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4001 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4002 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4003 #endif // CC_INTERP
4004
4005 #ifdef COMPILER2
4006 if (!EliminateLocks) {
4007 EliminateNestedLocks = false;
4008 }
4009 if (!Inline) {
4010 IncrementalInline = false;
4011 }
4012 #ifndef PRODUCT
4013 if (!IncrementalInline) {
4014 AlwaysIncrementalInline = false;
4015 }
4016 #endif
4017 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4018 // nothing to use the profiling, turn if off
4019 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4020 }
4021 #endif
4022
4023 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4024 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4025 DebugNonSafepoints = true;
4026 }
4027
4028 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4029 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4030 }
4031
4032 #ifndef PRODUCT
4033 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4034 if (use_vm_log()) {
4035 LogVMOutput = true;
4036 }
4037 }
4038 #endif // PRODUCT
4039
4040 if (PrintCommandLineFlags) {
4041 CommandLineFlags::printSetFlags(tty);
4042 }
4043
4044 // Apply CPU specific policy for the BiasedLocking
4045 if (UseBiasedLocking) {
4046 if (!VM_Version::use_biased_locking() &&
4047 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4048 UseBiasedLocking = false;
4049 }
4050 }
4051 #ifdef COMPILER2
4052 if (!UseBiasedLocking || EmitSync != 0) {
4053 UseOptoBiasInlining = false;
4054 }
4055 #endif
4056
4057 return JNI_OK;
4058 }
4059
4060 jint Arguments::adjust_after_os() {
4061 if (UseNUMA) {
4062 if (UseParallelGC || UseParallelOldGC) {
4063 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4064 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4065 }
4066 }
4067 // UseNUMAInterleaving is set to ON for all collectors and
4068 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4069 // such as the parallel collector for Linux and Solaris will
4070 // interleave old gen and survivor spaces on top of NUMA
4071 // allocation policy for the eden space.
4072 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4073 // all platforms and ParallelGC on Windows will interleave all
4074 // of the heap spaces across NUMA nodes.
4075 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4076 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4077 }
4078 }
4079 return JNI_OK;
4080 }
4081
4082 int Arguments::PropertyList_count(SystemProperty* pl) {
4083 int count = 0;
4084 while(pl != NULL) {
4085 count++;
4086 pl = pl->next();
4087 }
4088 return count;
4089 }
4090
4091 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4092 assert(key != NULL, "just checking");
4093 SystemProperty* prop;
4094 for (prop = pl; prop != NULL; prop = prop->next()) {
4095 if (strcmp(key, prop->key()) == 0) return prop->value();
4096 }
4097 return NULL;
4098 }
4099
4100 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4101 int count = 0;
4102 const char* ret_val = NULL;
4103
4104 while(pl != NULL) {
4105 if(count >= index) {
4106 ret_val = pl->key();
4107 break;
4108 }
4109 count++;
4110 pl = pl->next();
4111 }
4112
4113 return ret_val;
4114 }
4115
4116 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4117 int count = 0;
4118 char* ret_val = NULL;
4119
4120 while(pl != NULL) {
4121 if(count >= index) {
4122 ret_val = pl->value();
4123 break;
4124 }
4125 count++;
4126 pl = pl->next();
4127 }
4128
4129 return ret_val;
4130 }
4131
4132 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4133 SystemProperty* p = *plist;
4134 if (p == NULL) {
4135 *plist = new_p;
4136 } else {
4137 while (p->next() != NULL) {
4138 p = p->next();
4139 }
4140 p->set_next(new_p);
4141 }
4142 }
4143
4144 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4145 if (plist == NULL)
4146 return;
4147
4148 SystemProperty* new_p = new SystemProperty(k, v, true);
4149 PropertyList_add(plist, new_p);
4150 }
4151
4152 // This add maintains unique property key in the list.
4153 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4154 if (plist == NULL)
4155 return;
4156
4157 // If property key exist then update with new value.
4158 SystemProperty* prop;
4159 for (prop = *plist; prop != NULL; prop = prop->next()) {
4160 if (strcmp(k, prop->key()) == 0) {
4161 if (append) {
4162 prop->append_value(v);
4163 } else {
4164 prop->set_value(v);
4165 }
4166 return;
4167 }
4168 }
4169
4170 PropertyList_add(plist, k, v);
4171 }
4172
4173 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4174 // Returns true if all of the source pointed by src has been copied over to
4175 // the destination buffer pointed by buf. Otherwise, returns false.
4176 // Notes:
4177 // 1. If the length (buflen) of the destination buffer excluding the
4178 // NULL terminator character is not long enough for holding the expanded
4179 // pid characters, it also returns false instead of returning the partially
4180 // expanded one.
4181 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4182 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4183 char* buf, size_t buflen) {
4184 const char* p = src;
4185 char* b = buf;
4186 const char* src_end = &src[srclen];
4187 char* buf_end = &buf[buflen - 1];
4188
4189 while (p < src_end && b < buf_end) {
4190 if (*p == '%') {
4191 switch (*(++p)) {
4192 case '%': // "%%" ==> "%"
4193 *b++ = *p++;
4194 break;
4195 case 'p': { // "%p" ==> current process id
4196 // buf_end points to the character before the last character so
4197 // that we could write '\0' to the end of the buffer.
4198 size_t buf_sz = buf_end - b + 1;
4199 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4200
4201 // if jio_snprintf fails or the buffer is not long enough to hold
4202 // the expanded pid, returns false.
4203 if (ret < 0 || ret >= (int)buf_sz) {
4204 return false;
4205 } else {
4206 b += ret;
4207 assert(*b == '\0', "fail in copy_expand_pid");
4208 if (p == src_end && b == buf_end + 1) {
4209 // reach the end of the buffer.
4210 return true;
4211 }
4212 }
4213 p++;
4214 break;
4215 }
4216 default :
4217 *b++ = '%';
4218 }
4219 } else {
4220 *b++ = *p++;
4221 }
4222 }
4223 *b = '\0';
4224 return (p == src_end); // return false if not all of the source was copied
4225 }