1 /*
2 * Copyright (c) 1997, 2015, 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::_sun_boot_library_path = NULL;
119 SystemProperty *Arguments::_java_library_path = NULL;
120 SystemProperty *Arguments::_java_home = NULL;
121 SystemProperty *Arguments::_java_class_path = NULL;
122 SystemProperty *Arguments::_sun_boot_class_path = NULL;
123
124 char* Arguments::_meta_index_path = NULL;
125 char* Arguments::_meta_index_dir = NULL;
126 char* Arguments::_ext_dirs = NULL;
127
128 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
129 // part of the option string.
130 static bool match_option(const JavaVMOption *option, const char* name,
131 const char** tail) {
132 int len = (int)strlen(name);
133 if (strncmp(option->optionString, name, len) == 0) {
134 *tail = option->optionString + len;
135 return true;
136 } else {
137 return false;
138 }
139 }
140
141 // Check if 'option' matches 'name'. No "tail" is allowed.
142 static bool match_option(const JavaVMOption *option, const char* name) {
143 const char* tail = NULL;
144 bool result = match_option(option, name, &tail);
145 if (tail != NULL && *tail == '\0') {
146 return result;
147 } else {
148 return false;
149 }
150 }
151
152 // Return true if any of the strings in null-terminated array 'names' matches.
153 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
154 // the option must match exactly.
155 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
156 bool tail_allowed) {
157 for (/* empty */; *names != NULL; ++names) {
158 if (match_option(option, *names, tail)) {
159 if (**tail == '\0' || tail_allowed && **tail == ':') {
160 return true;
161 }
162 }
163 }
164 return false;
165 }
166
167 static void logOption(const char* opt) {
168 if (PrintVMOptions) {
169 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
170 }
171 }
172
173 // Process java launcher properties.
174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
175 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
176 // sun.java.launcher.pid is defined.
177 // Must do this before setting up other system properties,
178 // as some of them may depend on launcher type.
179 for (int index = 0; index < args->nOptions; index++) {
180 const JavaVMOption* option = args->options + index;
181 const char* tail;
182
183 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
184 process_java_launcher_argument(tail, option->extraInfo);
185 continue;
186 }
187 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
188 if (strcmp(tail, "true") == 0) {
189 _sun_java_launcher_is_altjvm = true;
190 }
191 continue;
192 }
193 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
194 _sun_java_launcher_pid = atoi(tail);
195 continue;
196 }
197 }
198 }
199
200 // Initialize system properties key and value.
201 void Arguments::init_system_properties() {
202
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
204 "Java Virtual Machine Specification", false));
205 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
208
209 // Following are JVMTI agent writable properties.
210 // Properties values are set to NULL and they are
211 // os specific they are initialized in os::init_system_properties_values().
212 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
213 _java_library_path = new SystemProperty("java.library.path", NULL, true);
214 _java_home = new SystemProperty("java.home", NULL, true);
215 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
216
217 _java_class_path = new SystemProperty("java.class.path", "", true);
218
219 // Add to System Property list.
220 PropertyList_add(&_system_properties, _sun_boot_library_path);
221 PropertyList_add(&_system_properties, _java_library_path);
222 PropertyList_add(&_system_properties, _java_home);
223 PropertyList_add(&_system_properties, _java_class_path);
224 PropertyList_add(&_system_properties, _sun_boot_class_path);
225
226 // Set OS specific system properties values
227 os::init_system_properties_values();
228 }
229
230
231 // Update/Initialize System properties after JDK version number is known
232 void Arguments::init_version_specific_system_properties() {
233 enum { bufsz = 16 };
234 char buffer[bufsz];
235 const char* spec_vendor = "Sun Microsystems Inc.";
236 uint32_t spec_version = 0;
237
238 spec_vendor = "Oracle Corporation";
239 spec_version = JDK_Version::current().major_version();
240 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
241
242 PropertyList_add(&_system_properties,
243 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
244 PropertyList_add(&_system_properties,
245 new SystemProperty("java.vm.specification.version", buffer, false));
246 PropertyList_add(&_system_properties,
247 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
248 }
249
250 //------------------------------------------------------------------------------
251 /*
252 * -XX argument processing
253 *
254 * Normal -XX arguments are defined in globals.hpp and are handled here in parse_argument().
255 *
256 * Over time -XX arguments may change. There are mechanisms to handle common cases:
257 *
258 * ALIAS: An option may be renamed or replaced by another option. The old name can be supported by adding
259 * the old and new option names to the "aliased_jvm_flags" table. Delete the old variable from globals.hpp.
260 *
261 * DEPRECATED: An option may be supported, but a warning is printed to let the user know that support may be removed
262 * in the future. Both regular and aliased options may be deprecated.
263 * Add a deprecation warning for an option (or alias) by adding an entry in the "deprecated_jvm_flags" table.
264 * Specify the option name, the jdk version that deprecated the option, and the jdk version in that will
265 * remove the option (if removal has been scheduled).
266 *
267 * OBSOLETE: An option may be removed (and deleted from globals.hpp), but still be accepted on the command line.
268 * A warning is printed to let the user know that support may be removed in the future.
269 * Add an obsolete warning for an option (or alias) by adding an entry in the "obsolete_jvm_flags" table.
270 * Specify the option name, the jdk version that deprecated the option, and the jdk version in that will
271 * remove the option (if removal has been scheduled).
272 *
273 * Tests: Aliases are tested in VMAliasOptions.java. Deprecated options in VMDeprecatedOptions.java. Obosloete options are tested in various files.
274 */
275
276 /**
277 * Declare an obsolete or deprecated -XX flag.
278 */
279 typedef struct {
280 const char* name;
281 JDK_Version obsoleted_in; // when the warning started (obsolete or deprecated)
282 JDK_Version accept_until; // which version to start denying the existence (if scheduled)
283
284 static const uint8_t _removal_unscheduled = 0;
285
286 bool is_removal_scheduled() const {
287 return accept_until.major_version() != _removal_unscheduled;
288 }
289
290 } SpecialFlag;
291
292 /**
293 * When a flag is eliminated, it can be added to this list in order to
294 * continue accepting this flag on the command-line, while issuing a warning
295 * and ignoring the value. Once the JDK version reaches the 'accept_until'
296 * limit, we flatly refuse to admit the existence of the flag. This allows
297 * a flag to die correctly over JDK releases using HSX.
298 */
299 static SpecialFlag const obsolete_jvm_flags[] = {
300 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
301 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
302 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
303 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
304 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
305 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
306 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
307 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
308 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
309 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
310 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
311 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
312 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
313 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
314 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
315 { "DefaultInitialRAMFraction",
316 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
317 { "UseDepthFirstScavengeOrder",
318 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
319 { "HandlePromotionFailure",
320 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
321 { "MaxLiveObjectEvacuationRatio",
322 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
323 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
324 { "UseParallelOldGCCompacting",
325 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
326 { "UseParallelDensePrefixUpdate",
327 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
328 { "UseParallelOldGCDensePrefix",
329 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
330 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
331 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
332 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
333 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
334 { "CMSInitiatingPermOccupancyFraction",
335 JDK_Version::jdk(8), JDK_Version::jdk(9) },
336 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
337 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
338 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
339 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
340 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
341 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
342 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
343 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
344 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
345 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
346 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
347 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
348 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
349 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
350 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
351 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 #ifdef PRODUCT
354 { "DesiredMethodLimit", JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
355 #endif // PRODUCT
356 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
357 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 #ifndef ZERO
369 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 #endif // ZERO
372 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { NULL, JDK_Version(0), JDK_Version(0) }
374 };
375
376 /**
377 * Deprecated flags are like obsolete flags except that they still *do* something. A flag
378 * in the deprecated_jvm_flags list must either have a corresponding declaration in globals.hpp,
379 * or be an "alias" (see below) for a real flag.
380 *
381 * Once the JDK version reaches the 'accept_until' limit, we flatly refuse to admit the existence of the flag.
382 * At this point its declaration (if it has one) can be removed from globals.hpp.
383 */
384 static SpecialFlag const deprecated_jvm_flags[] = {
385 // deprecated non-alias flags:
386 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(SpecialFlag::_removal_unscheduled) },
387 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::jdk(10) },
388
389 // deprecated alias flags (see also aliased_jvm_flags):
390 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(SpecialFlag::_removal_unscheduled) },
391 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::jdk(10) },
392 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::jdk(10) },
393 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::jdk(10) },
394 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
395 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { NULL, JDK_Version(0), JDK_Version(0) }
397 };
398
399 /**
400 * Some flags are actually aliases for other flags. This is often part of the process of
401 * deprecating a flag, but not all aliases need to be deprecated.
402 */
403 typedef struct {
404 const char* alias_name;
405 const char* real_name;
406 } AliasedFlag;
407
408 static AliasedFlag const aliased_jvm_flags[] = {
409 { "DefaultMaxRAMFraction", "MaxRAMFraction"},
410 { "CMSMarkStackSizeMax", "MarkStackSizeMax"},
411 { "CMSMarkStackSize", "MarkStackSize"},
412 { "G1MarkStackSize", "MarkStackSize"},
413 { "ParallelMarkingThreads", "ConcGCThreads"},
414 { "ParallelCMSThreads", "ConcGCThreads"},
415 { NULL, NULL}
416 };
417
418 // Returns 1 if the flag is special and jdk version is in the range specified.
419 // In this case value is filled in with the version number when the flag became
420 // special so that that value can be displayed to the user.
421 // Returns -1 if the flag is special and has expired (should be ignored))
422 // Returns 0 if the flag is not special.
423 static int is_special_flag(const SpecialFlag special_table[], const char *s, JDK_Version* version) {
424 int i = 0;
425 assert(version != NULL, "Must provide a version buffer");
426 while (special_table[i].name != NULL) {
427 const SpecialFlag& flag_status = special_table[i];
428 // <flag>=xxx form
429 // [-|+]<flag> form
430 size_t len = strlen(flag_status.name);
431 if (((strncmp(flag_status.name, s, len) == 0) &&
432 (strlen(s) == len)) ||
433 ((s[0] == '+' || s[0] == '-') &&
434 (strncmp(flag_status.name, &s[1], len) == 0) &&
435 (strlen(&s[1]) == len))) {
436 if (!flag_status.is_removal_scheduled() ||
437 JDK_Version::current().compare(flag_status.accept_until) == -1) {
438 *version = flag_status.obsoleted_in;
439 return 1;
440 } else {
441 return -1;
442 }
443 }
444 i++;
445 }
446 return 0;
447 }
448
449 // Returns true if the flag is obsolete and fits into the range specified
450 // for being ignored. In the case that the flag is ignored, the 'version'
451 // buffer is filled in with the version number when the flag became
452 // obsolete so that that value can be displayed to the user.
453 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
454 return (is_special_flag(obsolete_jvm_flags, s, version) == 1);
455 }
456
457 int Arguments::is_deprecated_flag(const char *s, JDK_Version* version) {
458 return is_special_flag(deprecated_jvm_flags, s, version);
459 }
460
461 // Return the real name for the flag passed on the command line.
462 const char* Arguments::real_flag_name(const char *flag_name) {
463 int i = 0;
464 while (aliased_jvm_flags[i].alias_name != NULL) {
465 const AliasedFlag& flag_status = aliased_jvm_flags[i];
466 size_t len = strlen(flag_status.alias_name);
467 if (((strncmp(flag_status.alias_name, flag_name, len) == 0) &&
468 (strlen(flag_name) == len))) {
469 return flag_status.real_name;
470 }
471 i++;
472 }
473 return flag_name;
474 }
475
476 //------------------------------------------------------------------------------
477
478 // Constructs the system class path (aka boot class path) from the following
479 // components, in order:
480 //
481 // prefix // from -Xbootclasspath/p:...
482 // base // from os::get_system_properties() or -Xbootclasspath=
483 // suffix // from -Xbootclasspath/a:...
484 //
485 // This could be AllStatic, but it isn't needed after argument processing is
486 // complete.
487 class SysClassPath: public StackObj {
488 public:
489 SysClassPath(const char* base);
490 ~SysClassPath();
491
492 inline void set_base(const char* base);
493 inline void add_prefix(const char* prefix);
494 inline void add_suffix_to_prefix(const char* suffix);
495 inline void add_suffix(const char* suffix);
496 inline void reset_path(const char* base);
497
498 inline const char* get_base() const { return _items[_scp_base]; }
499 inline const char* get_prefix() const { return _items[_scp_prefix]; }
500 inline const char* get_suffix() const { return _items[_scp_suffix]; }
501
502 // Combine all the components into a single c-heap-allocated string; caller
503 // must free the string if/when no longer needed.
504 char* combined_path();
505
506 private:
507 // Utility routines.
508 static char* add_to_path(const char* path, const char* str, bool prepend);
509 static char* add_jars_to_path(char* path, const char* directory);
510
511 inline void reset_item_at(int index);
512
513 // Array indices for the items that make up the sysclasspath. All except the
514 // base are allocated in the C heap and freed by this class.
515 enum {
516 _scp_prefix, // from -Xbootclasspath/p:...
517 _scp_base, // the default sysclasspath
518 _scp_suffix, // from -Xbootclasspath/a:...
519 _scp_nitems // the number of items, must be last.
520 };
521
522 const char* _items[_scp_nitems];
523 };
524
525 SysClassPath::SysClassPath(const char* base) {
526 memset(_items, 0, sizeof(_items));
527 _items[_scp_base] = base;
528 }
529
530 SysClassPath::~SysClassPath() {
531 // Free everything except the base.
532 for (int i = 0; i < _scp_nitems; ++i) {
533 if (i != _scp_base) reset_item_at(i);
534 }
535 }
536
537 inline void SysClassPath::set_base(const char* base) {
538 _items[_scp_base] = base;
539 }
540
541 inline void SysClassPath::add_prefix(const char* prefix) {
542 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
543 }
544
545 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
546 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
547 }
548
549 inline void SysClassPath::add_suffix(const char* suffix) {
550 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
551 }
552
553 inline void SysClassPath::reset_item_at(int index) {
554 assert(index < _scp_nitems && index != _scp_base, "just checking");
555 if (_items[index] != NULL) {
556 FREE_C_HEAP_ARRAY(char, _items[index]);
557 _items[index] = NULL;
558 }
559 }
560
561 inline void SysClassPath::reset_path(const char* base) {
562 // Clear the prefix and suffix.
563 reset_item_at(_scp_prefix);
564 reset_item_at(_scp_suffix);
565 set_base(base);
566 }
567
568 //------------------------------------------------------------------------------
569
570
571 // Combine the bootclasspath elements, some of which may be null, into a single
572 // c-heap-allocated string.
573 char* SysClassPath::combined_path() {
574 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
575
576 size_t lengths[_scp_nitems];
577 size_t total_len = 0;
578
579 const char separator = *os::path_separator();
580
581 // Get the lengths.
582 int i;
583 for (i = 0; i < _scp_nitems; ++i) {
584 if (_items[i] != NULL) {
585 lengths[i] = strlen(_items[i]);
586 // Include space for the separator char (or a NULL for the last item).
587 total_len += lengths[i] + 1;
588 }
589 }
590 assert(total_len > 0, "empty sysclasspath not allowed");
591
592 // Copy the _items to a single string.
593 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
594 char* cp_tmp = cp;
595 for (i = 0; i < _scp_nitems; ++i) {
596 if (_items[i] != NULL) {
597 memcpy(cp_tmp, _items[i], lengths[i]);
598 cp_tmp += lengths[i];
599 *cp_tmp++ = separator;
600 }
601 }
602 *--cp_tmp = '\0'; // Replace the extra separator.
603 return cp;
604 }
605
606 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
607 char*
608 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
609 char *cp;
610
611 assert(str != NULL, "just checking");
612 if (path == NULL) {
613 size_t len = strlen(str) + 1;
614 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
615 memcpy(cp, str, len); // copy the trailing null
616 } else {
617 const char separator = *os::path_separator();
618 size_t old_len = strlen(path);
619 size_t str_len = strlen(str);
620 size_t len = old_len + str_len + 2;
621
622 if (prepend) {
623 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
624 char* cp_tmp = cp;
625 memcpy(cp_tmp, str, str_len);
626 cp_tmp += str_len;
627 *cp_tmp = separator;
628 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
629 FREE_C_HEAP_ARRAY(char, path);
630 } else {
631 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
632 char* cp_tmp = cp + old_len;
633 *cp_tmp = separator;
634 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
635 }
636 }
637 return cp;
638 }
639
640 // Scan the directory and append any jar or zip files found to path.
641 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
642 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
643 DIR* dir = os::opendir(directory);
644 if (dir == NULL) return path;
645
646 char dir_sep[2] = { '\0', '\0' };
647 size_t directory_len = strlen(directory);
648 const char fileSep = *os::file_separator();
649 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
650
651 /* Scan the directory for jars/zips, appending them to path. */
652 struct dirent *entry;
653 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
654 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
655 const char* name = entry->d_name;
656 const char* ext = name + strlen(name) - 4;
657 bool isJarOrZip = ext > name &&
658 (os::file_name_strcmp(ext, ".jar") == 0 ||
659 os::file_name_strcmp(ext, ".zip") == 0);
660 if (isJarOrZip) {
661 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
662 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
663 path = add_to_path(path, jarpath, false);
664 FREE_C_HEAP_ARRAY(char, jarpath);
665 }
666 }
667 FREE_C_HEAP_ARRAY(char, dbuf);
668 os::closedir(dir);
669 return path;
670 }
671
672 // Parses a memory size specification string.
673 static bool atomull(const char *s, julong* result) {
674 julong n = 0;
675 int args_read = 0;
676 bool is_hex = false;
677 // Skip leading 0[xX] for hexadecimal
678 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
679 s += 2;
680 is_hex = true;
681 args_read = sscanf(s, JULONG_FORMAT_X, &n);
682 } else {
683 args_read = sscanf(s, JULONG_FORMAT, &n);
684 }
685 if (args_read != 1) {
686 return false;
687 }
688 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
689 s++;
690 }
691 // 4705540: illegal if more characters are found after the first non-digit
692 if (strlen(s) > 1) {
693 return false;
694 }
695 switch (*s) {
696 case 'T': case 't':
697 *result = n * G * K;
698 // Check for overflow.
699 if (*result/((julong)G * K) != n) return false;
700 return true;
701 case 'G': case 'g':
702 *result = n * G;
703 if (*result/G != n) return false;
704 return true;
705 case 'M': case 'm':
706 *result = n * M;
707 if (*result/M != n) return false;
708 return true;
709 case 'K': case 'k':
710 *result = n * K;
711 if (*result/K != n) return false;
712 return true;
713 case '\0':
714 *result = n;
715 return true;
716 default:
717 return false;
718 }
719 }
720
721 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
722 if (size < min_size) return arg_too_small;
723 // Check that size will fit in a size_t (only relevant on 32-bit)
724 if (size > max_uintx) return arg_too_big;
725 return arg_in_range;
726 }
727
728 // Describe an argument out of range error
729 void Arguments::describe_range_error(ArgsRange errcode) {
730 switch(errcode) {
731 case arg_too_big:
732 jio_fprintf(defaultStream::error_stream(),
733 "The specified size exceeds the maximum "
734 "representable size.\n");
735 break;
736 case arg_too_small:
737 case arg_unreadable:
738 case arg_in_range:
739 // do nothing for now
740 break;
741 default:
742 ShouldNotReachHere();
743 }
744 }
745
746 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
747 return CommandLineFlags::boolAtPut(name, &value, origin);
748 }
749
750 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
751 double v;
752 if (sscanf(value, "%lf", &v) != 1) {
753 return false;
754 }
755
756 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
757 return true;
758 }
759 return false;
760 }
761
762 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
763 julong v;
764 intx intx_v;
765 bool is_neg = false;
766 // Check the sign first since atomull() parses only unsigned values.
767 if (*value == '-') {
768 if (!CommandLineFlags::intxAt(name, &intx_v)) {
769 return false;
770 }
771 value++;
772 is_neg = true;
773 }
774 if (!atomull(value, &v)) {
775 return false;
776 }
777 intx_v = (intx) v;
778 if (is_neg) {
779 intx_v = -intx_v;
780 }
781 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
782 return true;
783 }
784 uintx uintx_v = (uintx) v;
785 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
786 return true;
787 }
788 uint64_t uint64_t_v = (uint64_t) v;
789 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
790 return true;
791 }
792 size_t size_t_v = (size_t) v;
793 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
794 return true;
795 }
796 return false;
797 }
798
799 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
800 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
801 // Contract: CommandLineFlags always returns a pointer that needs freeing.
802 FREE_C_HEAP_ARRAY(char, value);
803 return true;
804 }
805
806 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
807 const char* old_value = "";
808 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
809 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
810 size_t new_len = strlen(new_value);
811 const char* value;
812 char* free_this_too = NULL;
813 if (old_len == 0) {
814 value = new_value;
815 } else if (new_len == 0) {
816 value = old_value;
817 } else {
818 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
819 // each new setting adds another LINE to the switch:
820 sprintf(buf, "%s\n%s", old_value, new_value);
821 value = buf;
822 free_this_too = buf;
823 }
824 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
825 // CommandLineFlags always returns a pointer that needs freeing.
826 FREE_C_HEAP_ARRAY(char, value);
827 if (free_this_too != NULL) {
828 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
829 FREE_C_HEAP_ARRAY(char, free_this_too);
830 }
831 return true;
832 }
833
834 // For expired deprecated option return null, for aliased option return the real option name, otherwise return "arg".
835 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
836 const char* real_name = real_flag_name(arg);
837 JDK_Version since = JDK_Version();
838 switch (is_deprecated_flag(arg, &since)) {
839 case -1:
840 return NULL;
841 case 0:
842 return real_name;
843 case 1: {
844 char version[256];
845 since.to_string(version, sizeof(version));
846 if (real_name != arg) {
847 warning("option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
848 arg, version, real_name);
849 } else {
850 warning("option %s was deprecated in version %s and will likely be removed in a future release.",
851 arg, version);
852 }
853 return real_name;
854 }
855 }
856 ShouldNotReachHere();
857 return NULL;
858 }
859
860 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
861
862 // range of acceptable characters spelled out for portability reasons
863 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
864 #define BUFLEN 255
865 char name[BUFLEN+1];
866 char dummy;
867 const char* real_name;
868
869 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
870 real_name = handle_aliases_and_deprecation(name);
871 if (real_name == NULL) {
872 return NULL; // "name" is a deprecated option that has expired.
873 }
874 return set_bool_flag(real_name, false, origin);
875 }
876 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
877 real_name = handle_aliases_and_deprecation(name);
878 if (real_name == NULL) {
879 return NULL;
880 }
881 return set_bool_flag(real_name, true, origin);
882 }
883
884 char punct;
885 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
886 const char* value = strchr(arg, '=') + 1;
887 Flag* flag;
888
889 real_name = handle_aliases_and_deprecation(name);
890 if (real_name == NULL) {
891 return NULL;
892 }
893 flag = Flag::find_flag(real_name, strlen(real_name));
894 if (flag != NULL && flag->is_ccstr()) {
895 if (flag->ccstr_accumulates()) {
896 return append_to_string_flag(real_name, value, origin);
897 } else {
898 if (value[0] == '\0') {
899 value = NULL;
900 }
901 return set_string_flag(real_name, value, origin);
902 }
903 }
904 }
905
906 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
907 const char* value = strchr(arg, '=') + 1;
908 // -XX:Foo:=xxx will reset the string flag to the given value.
909 if (value[0] == '\0') {
910 value = NULL;
911 }
912 real_name = handle_aliases_and_deprecation(name);
913 if (real_name == NULL) {
914 return NULL;
915 }
916 return set_string_flag(real_name, value, origin);
917 }
918
919 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
920 #define SIGNED_NUMBER_RANGE "[-0123456789]"
921 #define NUMBER_RANGE "[0123456789]"
922 char value[BUFLEN + 1];
923 char value2[BUFLEN + 1];
924 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
925 // Looks like a floating-point number -- try again with more lenient format string
926 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
927 real_name = handle_aliases_and_deprecation(name);
928 if (real_name == NULL) {
929 return NULL;
930 }
931 return set_fp_numeric_flag(real_name, value, origin);
932 }
933 }
934
935 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
936 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
937 real_name = handle_aliases_and_deprecation(name);
938 if (real_name == NULL) {
939 return NULL;
940 }
941 return set_numeric_flag(real_name, value, origin);
942 }
943
944 return false;
945 }
946
947 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
948 assert(bldarray != NULL, "illegal argument");
949
950 if (arg == NULL) {
951 return;
952 }
953
954 int new_count = *count + 1;
955
956 // expand the array and add arg to the last element
957 if (*bldarray == NULL) {
958 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
959 } else {
960 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
961 }
962 (*bldarray)[*count] = os::strdup_check_oom(arg);
963 *count = new_count;
964 }
965
966 void Arguments::build_jvm_args(const char* arg) {
967 add_string(&_jvm_args_array, &_num_jvm_args, arg);
968 }
969
970 void Arguments::build_jvm_flags(const char* arg) {
971 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
972 }
973
974 // utility function to return a string that concatenates all
975 // strings in a given char** array
976 const char* Arguments::build_resource_string(char** args, int count) {
977 if (args == NULL || count == 0) {
978 return NULL;
979 }
980 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
981 for (int i = 1; i < count; i++) {
982 length += strlen(args[i]) + 1; // add 1 for a space
983 }
984 char* s = NEW_RESOURCE_ARRAY(char, length);
985 strcpy(s, args[0]);
986 for (int j = 1; j < count; j++) {
987 strcat(s, " ");
988 strcat(s, args[j]);
989 }
990 return (const char*) s;
991 }
992
993 void Arguments::print_on(outputStream* st) {
994 st->print_cr("VM Arguments:");
995 if (num_jvm_flags() > 0) {
996 st->print("jvm_flags: "); print_jvm_flags_on(st);
997 }
998 if (num_jvm_args() > 0) {
999 st->print("jvm_args: "); print_jvm_args_on(st);
1000 }
1001 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1002 if (_java_class_path != NULL) {
1003 char* path = _java_class_path->value();
1004 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1005 }
1006 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1007 }
1008
1009 void Arguments::print_jvm_flags_on(outputStream* st) {
1010 if (_num_jvm_flags > 0) {
1011 for (int i=0; i < _num_jvm_flags; i++) {
1012 st->print("%s ", _jvm_flags_array[i]);
1013 }
1014 st->cr();
1015 }
1016 }
1017
1018 void Arguments::print_jvm_args_on(outputStream* st) {
1019 if (_num_jvm_args > 0) {
1020 for (int i=0; i < _num_jvm_args; i++) {
1021 st->print("%s ", _jvm_args_array[i]);
1022 }
1023 st->cr();
1024 }
1025 }
1026
1027 bool Arguments::process_argument(const char* arg,
1028 jboolean ignore_unrecognized, Flag::Flags origin) {
1029
1030 JDK_Version since = JDK_Version();
1031
1032 if (parse_argument(arg, origin) || ignore_unrecognized) {
1033 return true;
1034 }
1035
1036 bool has_plus_minus = (*arg == '+' || *arg == '-');
1037 const char* const argname = has_plus_minus ? arg + 1 : arg;
1038 if (is_newly_obsolete(arg, &since)) {
1039 char version[256];
1040 since.to_string(version, sizeof(version));
1041 warning("ignoring option %s; support was removed in %s", argname, version);
1042 return true;
1043 }
1044
1045 // For locked flags, report a custom error message if available.
1046 // Otherwise, report the standard unrecognized VM option.
1047
1048 size_t arg_len;
1049 const char* equal_sign = strchr(argname, '=');
1050 if (equal_sign == NULL) {
1051 arg_len = strlen(argname);
1052 } else {
1053 arg_len = equal_sign - argname;
1054 }
1055
1056 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1057 if (found_flag != NULL) {
1058 char locked_message_buf[BUFLEN];
1059 found_flag->get_locked_message(locked_message_buf, BUFLEN);
1060 if (strlen(locked_message_buf) == 0) {
1061 if (found_flag->is_bool() && !has_plus_minus) {
1062 jio_fprintf(defaultStream::error_stream(),
1063 "Missing +/- setting for VM option '%s'\n", argname);
1064 } else if (!found_flag->is_bool() && has_plus_minus) {
1065 jio_fprintf(defaultStream::error_stream(),
1066 "Unexpected +/- setting in VM option '%s'\n", argname);
1067 } else {
1068 jio_fprintf(defaultStream::error_stream(),
1069 "Improperly specified VM option '%s'\n", argname);
1070 }
1071 } else {
1072 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1073 }
1074 } else {
1075 jio_fprintf(defaultStream::error_stream(),
1076 "Unrecognized VM option '%s'\n", argname);
1077 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1078 if (fuzzy_matched != NULL) {
1079 jio_fprintf(defaultStream::error_stream(),
1080 "Did you mean '%s%s%s'? ",
1081 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1082 fuzzy_matched->_name,
1083 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1084 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
1085 char version[256];
1086 since.to_string(version, sizeof(version));
1087 jio_fprintf(defaultStream::error_stream(),
1088 "Warning: support for %s was removed in %s\n",
1089 fuzzy_matched->_name,
1090 version);
1091 }
1092 }
1093 }
1094
1095 // allow for commandline "commenting out" options like -XX:#+Verbose
1096 return arg[0] == '#';
1097 }
1098
1099 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1100 FILE* stream = fopen(file_name, "rb");
1101 if (stream == NULL) {
1102 if (should_exist) {
1103 jio_fprintf(defaultStream::error_stream(),
1104 "Could not open settings file %s\n", file_name);
1105 return false;
1106 } else {
1107 return true;
1108 }
1109 }
1110
1111 char token[1024];
1112 int pos = 0;
1113
1114 bool in_white_space = true;
1115 bool in_comment = false;
1116 bool in_quote = false;
1117 char quote_c = 0;
1118 bool result = true;
1119
1120 int c = getc(stream);
1121 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1122 if (in_white_space) {
1123 if (in_comment) {
1124 if (c == '\n') in_comment = false;
1125 } else {
1126 if (c == '#') in_comment = true;
1127 else if (!isspace(c)) {
1128 in_white_space = false;
1129 token[pos++] = c;
1130 }
1131 }
1132 } else {
1133 if (c == '\n' || (!in_quote && isspace(c))) {
1134 // token ends at newline, or at unquoted whitespace
1135 // this allows a way to include spaces in string-valued options
1136 token[pos] = '\0';
1137 logOption(token);
1138 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1139 build_jvm_flags(token);
1140 pos = 0;
1141 in_white_space = true;
1142 in_quote = false;
1143 } else if (!in_quote && (c == '\'' || c == '"')) {
1144 in_quote = true;
1145 quote_c = c;
1146 } else if (in_quote && (c == quote_c)) {
1147 in_quote = false;
1148 } else {
1149 token[pos++] = c;
1150 }
1151 }
1152 c = getc(stream);
1153 }
1154 if (pos > 0) {
1155 token[pos] = '\0';
1156 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1157 build_jvm_flags(token);
1158 }
1159 fclose(stream);
1160 return result;
1161 }
1162
1163 //=============================================================================================================
1164 // Parsing of properties (-D)
1165
1166 const char* Arguments::get_property(const char* key) {
1167 return PropertyList_get_value(system_properties(), key);
1168 }
1169
1170 bool Arguments::add_property(const char* prop) {
1171 const char* eq = strchr(prop, '=');
1172 char* key;
1173 // ns must be static--its address may be stored in a SystemProperty object.
1174 const static char ns[1] = {0};
1175 char* value = (char *)ns;
1176
1177 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1178 key = AllocateHeap(key_len + 1, mtInternal);
1179 strncpy(key, prop, key_len);
1180 key[key_len] = '\0';
1181
1182 if (eq != NULL) {
1183 size_t value_len = strlen(prop) - key_len - 1;
1184 value = AllocateHeap(value_len + 1, mtInternal);
1185 strncpy(value, &prop[key_len + 1], value_len + 1);
1186 }
1187
1188 if (strcmp(key, "java.compiler") == 0) {
1189 process_java_compiler_argument(value);
1190 FreeHeap(key);
1191 if (eq != NULL) {
1192 FreeHeap(value);
1193 }
1194 return true;
1195 } else if (strcmp(key, "sun.java.command") == 0) {
1196 _java_command = value;
1197
1198 // Record value in Arguments, but let it get passed to Java.
1199 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1200 strcmp(key, "sun.java.launcher.pid") == 0) {
1201 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1202 // private and are processed in process_sun_java_launcher_properties();
1203 // the sun.java.launcher property is passed on to the java application
1204 FreeHeap(key);
1205 if (eq != NULL) {
1206 FreeHeap(value);
1207 }
1208 return true;
1209 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1210 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1211 // its value without going through the property list or making a Java call.
1212 _java_vendor_url_bug = value;
1213 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1214 PropertyList_unique_add(&_system_properties, key, value, true);
1215 return true;
1216 }
1217 // Create new property and add at the end of the list
1218 PropertyList_unique_add(&_system_properties, key, value);
1219 return true;
1220 }
1221
1222 //===========================================================================================================
1223 // Setting int/mixed/comp mode flags
1224
1225 void Arguments::set_mode_flags(Mode mode) {
1226 // Set up default values for all flags.
1227 // If you add a flag to any of the branches below,
1228 // add a default value for it here.
1229 set_java_compiler(false);
1230 _mode = mode;
1231
1232 // Ensure Agent_OnLoad has the correct initial values.
1233 // This may not be the final mode; mode may change later in onload phase.
1234 PropertyList_unique_add(&_system_properties, "java.vm.info",
1235 (char*)VM_Version::vm_info_string(), false);
1236
1237 UseInterpreter = true;
1238 UseCompiler = true;
1239 UseLoopCounter = true;
1240
1241 // Default values may be platform/compiler dependent -
1242 // use the saved values
1243 ClipInlining = Arguments::_ClipInlining;
1244 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1245 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1246 BackgroundCompilation = Arguments::_BackgroundCompilation;
1247
1248 // Change from defaults based on mode
1249 switch (mode) {
1250 default:
1251 ShouldNotReachHere();
1252 break;
1253 case _int:
1254 UseCompiler = false;
1255 UseLoopCounter = false;
1256 AlwaysCompileLoopMethods = false;
1257 UseOnStackReplacement = false;
1258 break;
1259 case _mixed:
1260 // same as default
1261 break;
1262 case _comp:
1263 UseInterpreter = false;
1264 BackgroundCompilation = false;
1265 ClipInlining = false;
1266 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1267 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1268 // compile a level 4 (C2) and then continue executing it.
1269 if (TieredCompilation) {
1270 Tier3InvokeNotifyFreqLog = 0;
1271 Tier4InvocationThreshold = 0;
1272 }
1273 break;
1274 }
1275 }
1276
1277 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1278 // Conflict: required to use shared spaces (-Xshare:on), but
1279 // incompatible command line options were chosen.
1280
1281 static void no_shared_spaces(const char* message) {
1282 if (RequireSharedSpaces) {
1283 jio_fprintf(defaultStream::error_stream(),
1284 "Class data sharing is inconsistent with other specified options.\n");
1285 vm_exit_during_initialization("Unable to use shared archive.", message);
1286 } else {
1287 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1288 }
1289 }
1290 #endif
1291
1292 // Returns threshold scaled with CompileThresholdScaling
1293 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1294 return (intx)(threshold * CompileThresholdScaling);
1295 }
1296
1297 // Returns freq_log scaled with CompileThresholdScaling
1298 intx Arguments::get_scaled_freq_log(intx freq_log) {
1299 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1300 if (scaled_freq == 0) {
1301 return 0;
1302 } else {
1303 return log2_intptr(scaled_freq);
1304 }
1305 }
1306
1307 void Arguments::set_tiered_flags() {
1308 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1309 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1310 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1311 }
1312 if (CompilationPolicyChoice < 2) {
1313 vm_exit_during_initialization(
1314 "Incompatible compilation policy selected", NULL);
1315 }
1316 // Increase the code cache size - tiered compiles a lot more.
1317 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1318 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1319 }
1320 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1321 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1322 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1323
1324 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1325 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1326 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1327 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1328 }
1329 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1330 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1331 }
1332 // Check consistency of code heap sizes
1333 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1334 jio_fprintf(defaultStream::error_stream(),
1335 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1336 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1337 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1338 vm_exit(1);
1339 }
1340 }
1341 }
1342 if (!UseInterpreter) { // -Xcomp
1343 Tier3InvokeNotifyFreqLog = 0;
1344 Tier4InvocationThreshold = 0;
1345 }
1346 // Scale tiered compilation thresholds
1347 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1348 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1349 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1350
1351 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1352 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1353 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1354 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1355
1356 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1357 // once these thresholds become supported.
1358
1359 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1360 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1361
1362 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1363 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1364
1365 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1366
1367 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1368 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1369 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1370 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1371 }
1372 }
1373
1374 /**
1375 * Returns the minimum number of compiler threads needed to run the JVM. The following
1376 * configurations are possible.
1377 *
1378 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1379 * compiler threads is 0.
1380 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1381 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1382 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1383 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1384 * C1 can be used, so the minimum number of compiler threads is 1.
1385 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1386 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1387 * the minimum number of compiler threads is 2.
1388 */
1389 int Arguments::get_min_number_of_compiler_threads() {
1390 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1391 return 0; // case 1
1392 #else
1393 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1394 return 1; // case 2 or case 3
1395 }
1396 return 2; // case 4 (tiered)
1397 #endif
1398 }
1399
1400 #if INCLUDE_ALL_GCS
1401 static void disable_adaptive_size_policy(const char* collector_name) {
1402 if (UseAdaptiveSizePolicy) {
1403 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1404 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1405 collector_name);
1406 }
1407 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1408 }
1409 }
1410
1411 void Arguments::set_parnew_gc_flags() {
1412 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1413 "control point invariant");
1414 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1415 assert(UseParNewGC, "ParNew should always be used with CMS");
1416
1417 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1418 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1419 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1420 } else if (ParallelGCThreads == 0) {
1421 jio_fprintf(defaultStream::error_stream(),
1422 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1423 vm_exit(1);
1424 }
1425
1426 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1427 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1428 // we set them to 1024 and 1024.
1429 // See CR 6362902.
1430 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1431 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1432 }
1433 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1434 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1435 }
1436
1437 // When using compressed oops, we use local overflow stacks,
1438 // rather than using a global overflow list chained through
1439 // the klass word of the object's pre-image.
1440 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1441 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1442 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1443 }
1444 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1445 }
1446 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1447 }
1448
1449 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1450 // sparc/solaris for certain applications, but would gain from
1451 // further optimization and tuning efforts, and would almost
1452 // certainly gain from analysis of platform and environment.
1453 void Arguments::set_cms_and_parnew_gc_flags() {
1454 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1455 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1456 assert(UseParNewGC, "ParNew should always be used with CMS");
1457
1458 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1459 disable_adaptive_size_policy("UseConcMarkSweepGC");
1460
1461 set_parnew_gc_flags();
1462
1463 size_t max_heap = align_size_down(MaxHeapSize,
1464 CardTableRS::ct_max_alignment_constraint());
1465
1466 // Now make adjustments for CMS
1467 intx tenuring_default = (intx)6;
1468 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1469
1470 // Preferred young gen size for "short" pauses:
1471 // upper bound depends on # of threads and NewRatio.
1472 const uintx parallel_gc_threads =
1473 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1474 const size_t preferred_max_new_size_unaligned =
1475 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1476 size_t preferred_max_new_size =
1477 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1478
1479 // Unless explicitly requested otherwise, size young gen
1480 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1481
1482 // If either MaxNewSize or NewRatio is set on the command line,
1483 // assume the user is trying to set the size of the young gen.
1484 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1485
1486 // Set MaxNewSize to our calculated preferred_max_new_size unless
1487 // NewSize was set on the command line and it is larger than
1488 // preferred_max_new_size.
1489 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1490 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1491 } else {
1492 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1493 }
1494 if (PrintGCDetails && Verbose) {
1495 // Too early to use gclog_or_tty
1496 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1497 }
1498
1499 // Code along this path potentially sets NewSize and OldSize
1500 if (PrintGCDetails && Verbose) {
1501 // Too early to use gclog_or_tty
1502 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1503 " initial_heap_size: " SIZE_FORMAT
1504 " max_heap: " SIZE_FORMAT,
1505 min_heap_size(), InitialHeapSize, max_heap);
1506 }
1507 size_t min_new = preferred_max_new_size;
1508 if (FLAG_IS_CMDLINE(NewSize)) {
1509 min_new = NewSize;
1510 }
1511 if (max_heap > min_new && min_heap_size() > min_new) {
1512 // Unless explicitly requested otherwise, make young gen
1513 // at least min_new, and at most preferred_max_new_size.
1514 if (FLAG_IS_DEFAULT(NewSize)) {
1515 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1516 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1517 if (PrintGCDetails && Verbose) {
1518 // Too early to use gclog_or_tty
1519 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1520 }
1521 }
1522 // Unless explicitly requested otherwise, size old gen
1523 // so it's NewRatio x of NewSize.
1524 if (FLAG_IS_DEFAULT(OldSize)) {
1525 if (max_heap > NewSize) {
1526 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1527 if (PrintGCDetails && Verbose) {
1528 // Too early to use gclog_or_tty
1529 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1530 }
1531 }
1532 }
1533 }
1534 }
1535 // Unless explicitly requested otherwise, definitely
1536 // promote all objects surviving "tenuring_default" scavenges.
1537 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1538 FLAG_IS_DEFAULT(SurvivorRatio)) {
1539 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1540 }
1541 // If we decided above (or user explicitly requested)
1542 // `promote all' (via MaxTenuringThreshold := 0),
1543 // prefer minuscule survivor spaces so as not to waste
1544 // space for (non-existent) survivors
1545 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1546 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1547 }
1548
1549 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1550 // but rather the number of free blocks of a given size that are used when
1551 // replenishing the local per-worker free list caches.
1552 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1553 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1554 // OldPLAB sizing manually turned off: Use a larger default setting,
1555 // unless it was manually specified. This is because a too-low value
1556 // will slow down scavenges.
1557 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1558 } else {
1559 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1560 }
1561 }
1562
1563 // If either of the static initialization defaults have changed, note this
1564 // modification.
1565 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1566 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1567 }
1568 if (PrintGCDetails && Verbose) {
1569 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1570 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1571 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1572 }
1573 }
1574 #endif // INCLUDE_ALL_GCS
1575
1576 void set_object_alignment() {
1577 // Object alignment.
1578 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1579 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1580 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1581 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1582 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1583 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1584
1585 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1586 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1587
1588 // Oop encoding heap max
1589 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1590
1591 #if INCLUDE_ALL_GCS
1592 // Set CMS global values
1593 CompactibleFreeListSpace::set_cms_values();
1594 #endif // INCLUDE_ALL_GCS
1595 }
1596
1597 bool verify_object_alignment() {
1598 // Object alignment.
1599 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1600 jio_fprintf(defaultStream::error_stream(),
1601 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1602 (int)ObjectAlignmentInBytes);
1603 return false;
1604 }
1605 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1606 jio_fprintf(defaultStream::error_stream(),
1607 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1608 (int)ObjectAlignmentInBytes, BytesPerLong);
1609 return false;
1610 }
1611 // It does not make sense to have big object alignment
1612 // since a space lost due to alignment will be greater
1613 // then a saved space from compressed oops.
1614 if ((int)ObjectAlignmentInBytes > 256) {
1615 jio_fprintf(defaultStream::error_stream(),
1616 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1617 (int)ObjectAlignmentInBytes);
1618 return false;
1619 }
1620 // In case page size is very small.
1621 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1622 jio_fprintf(defaultStream::error_stream(),
1623 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1624 (int)ObjectAlignmentInBytes, os::vm_page_size());
1625 return false;
1626 }
1627 if(SurvivorAlignmentInBytes == 0) {
1628 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1629 } else {
1630 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1631 jio_fprintf(defaultStream::error_stream(),
1632 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1633 (int)SurvivorAlignmentInBytes);
1634 return false;
1635 }
1636 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1637 jio_fprintf(defaultStream::error_stream(),
1638 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1639 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1640 return false;
1641 }
1642 }
1643 return true;
1644 }
1645
1646 size_t Arguments::max_heap_for_compressed_oops() {
1647 // Avoid sign flip.
1648 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1649 // We need to fit both the NULL page and the heap into the memory budget, while
1650 // keeping alignment constraints of the heap. To guarantee the latter, as the
1651 // NULL page is located before the heap, we pad the NULL page to the conservative
1652 // maximum alignment that the GC may ever impose upon the heap.
1653 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1654 _conservative_max_heap_alignment);
1655
1656 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1657 NOT_LP64(ShouldNotReachHere(); return 0);
1658 }
1659
1660 bool Arguments::should_auto_select_low_pause_collector() {
1661 if (UseAutoGCSelectPolicy &&
1662 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1663 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1664 if (PrintGCDetails) {
1665 // Cannot use gclog_or_tty yet.
1666 tty->print_cr("Automatic selection of the low pause collector"
1667 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1668 }
1669 return true;
1670 }
1671 return false;
1672 }
1673
1674 void Arguments::set_use_compressed_oops() {
1675 #ifndef ZERO
1676 #ifdef _LP64
1677 // MaxHeapSize is not set up properly at this point, but
1678 // the only value that can override MaxHeapSize if we are
1679 // to use UseCompressedOops is InitialHeapSize.
1680 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1681
1682 if (max_heap_size <= max_heap_for_compressed_oops()) {
1683 #if !defined(COMPILER1) || defined(TIERED)
1684 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1685 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1686 }
1687 #endif
1688 } else {
1689 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1690 warning("Max heap size too large for Compressed Oops");
1691 FLAG_SET_DEFAULT(UseCompressedOops, false);
1692 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1693 }
1694 }
1695 #endif // _LP64
1696 #endif // ZERO
1697 }
1698
1699
1700 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1701 // set_use_compressed_oops().
1702 void Arguments::set_use_compressed_klass_ptrs() {
1703 #ifndef ZERO
1704 #ifdef _LP64
1705 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1706 if (!UseCompressedOops) {
1707 if (UseCompressedClassPointers) {
1708 warning("UseCompressedClassPointers requires UseCompressedOops");
1709 }
1710 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1711 } else {
1712 // Turn on UseCompressedClassPointers too
1713 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1714 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1715 }
1716 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1717 if (UseCompressedClassPointers) {
1718 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1719 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1720 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1721 }
1722 }
1723 }
1724 #endif // _LP64
1725 #endif // !ZERO
1726 }
1727
1728 void Arguments::set_conservative_max_heap_alignment() {
1729 // The conservative maximum required alignment for the heap is the maximum of
1730 // the alignments imposed by several sources: any requirements from the heap
1731 // itself, the collector policy and the maximum page size we may run the VM
1732 // with.
1733 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1734 #if INCLUDE_ALL_GCS
1735 if (UseParallelGC) {
1736 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1737 } else if (UseG1GC) {
1738 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1739 }
1740 #endif // INCLUDE_ALL_GCS
1741 _conservative_max_heap_alignment = MAX4(heap_alignment,
1742 (size_t)os::vm_allocation_granularity(),
1743 os::max_page_size(),
1744 CollectorPolicy::compute_heap_alignment());
1745 }
1746
1747 void Arguments::select_gc_ergonomically() {
1748 if (os::is_server_class_machine()) {
1749 if (should_auto_select_low_pause_collector()) {
1750 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1751 } else {
1752 FLAG_SET_ERGO(bool, UseParallelGC, true);
1753 }
1754 }
1755 }
1756
1757 void Arguments::select_gc() {
1758 if (!gc_selected()) {
1759 ArgumentsExt::select_gc_ergonomically();
1760 }
1761 }
1762
1763 void Arguments::set_ergonomics_flags() {
1764 select_gc();
1765
1766 #ifdef COMPILER2
1767 // Shared spaces work fine with other GCs but causes bytecode rewriting
1768 // to be disabled, which hurts interpreter performance and decreases
1769 // server performance. When -server is specified, keep the default off
1770 // unless it is asked for. Future work: either add bytecode rewriting
1771 // at link time, or rewrite bytecodes in non-shared methods.
1772 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1773 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1774 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1775 }
1776 #endif
1777
1778 set_conservative_max_heap_alignment();
1779
1780 #ifndef ZERO
1781 #ifdef _LP64
1782 set_use_compressed_oops();
1783
1784 // set_use_compressed_klass_ptrs() must be called after calling
1785 // set_use_compressed_oops().
1786 set_use_compressed_klass_ptrs();
1787
1788 // Also checks that certain machines are slower with compressed oops
1789 // in vm_version initialization code.
1790 #endif // _LP64
1791 #endif // !ZERO
1792 }
1793
1794 void Arguments::set_parallel_gc_flags() {
1795 assert(UseParallelGC || UseParallelOldGC, "Error");
1796 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1797 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1798 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1799 }
1800 FLAG_SET_DEFAULT(UseParallelGC, true);
1801
1802 // If no heap maximum was requested explicitly, use some reasonable fraction
1803 // of the physical memory, up to a maximum of 1GB.
1804 FLAG_SET_DEFAULT(ParallelGCThreads,
1805 Abstract_VM_Version::parallel_worker_threads());
1806 if (ParallelGCThreads == 0) {
1807 jio_fprintf(defaultStream::error_stream(),
1808 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1809 vm_exit(1);
1810 }
1811
1812 if (UseAdaptiveSizePolicy) {
1813 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1814 // unless the user actually sets these flags.
1815 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1816 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1817 _min_heap_free_ratio = MinHeapFreeRatio;
1818 }
1819 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1820 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1821 _max_heap_free_ratio = MaxHeapFreeRatio;
1822 }
1823 }
1824
1825 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1826 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1827 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1828 // See CR 6362902 for details.
1829 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1830 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1831 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1832 }
1833 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1834 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1835 }
1836 }
1837
1838 if (UseParallelOldGC) {
1839 // Par compact uses lower default values since they are treated as
1840 // minimums. These are different defaults because of the different
1841 // interpretation and are not ergonomically set.
1842 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1843 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1844 }
1845 }
1846 }
1847
1848 void Arguments::set_g1_gc_flags() {
1849 assert(UseG1GC, "Error");
1850 #ifdef COMPILER1
1851 FastTLABRefill = false;
1852 #endif
1853 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1854 if (ParallelGCThreads == 0) {
1855 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1856 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1857 }
1858
1859 #if INCLUDE_ALL_GCS
1860 if (G1ConcRefinementThreads == 0) {
1861 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1862 }
1863 #endif
1864
1865 // MarkStackSize will be set (if it hasn't been set by the user)
1866 // when concurrent marking is initialized.
1867 // Its value will be based upon the number of parallel marking threads.
1868 // But we do set the maximum mark stack size here.
1869 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1870 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1871 }
1872
1873 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1874 // In G1, we want the default GC overhead goal to be higher than
1875 // say in PS. So we set it here to 10%. Otherwise the heap might
1876 // be expanded more aggressively than we would like it to. In
1877 // fact, even 10% seems to not be high enough in some cases
1878 // (especially small GC stress tests that the main thing they do
1879 // is allocation). We might consider increase it further.
1880 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1881 }
1882
1883 if (PrintGCDetails && Verbose) {
1884 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1885 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1886 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1887 }
1888 }
1889
1890 #if !INCLUDE_ALL_GCS
1891 #ifdef ASSERT
1892 static bool verify_serial_gc_flags() {
1893 return (UseSerialGC &&
1894 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1895 UseParallelGC || UseParallelOldGC));
1896 }
1897 #endif // ASSERT
1898 #endif // INCLUDE_ALL_GCS
1899
1900 void Arguments::set_gc_specific_flags() {
1901 #if INCLUDE_ALL_GCS
1902 // Set per-collector flags
1903 if (UseParallelGC || UseParallelOldGC) {
1904 set_parallel_gc_flags();
1905 } else if (UseConcMarkSweepGC) {
1906 set_cms_and_parnew_gc_flags();
1907 } else if (UseG1GC) {
1908 set_g1_gc_flags();
1909 }
1910 if (AssumeMP && !UseSerialGC) {
1911 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1912 warning("If the number of processors is expected to increase from one, then"
1913 " you should configure the number of parallel GC threads appropriately"
1914 " using -XX:ParallelGCThreads=N");
1915 }
1916 }
1917 if (MinHeapFreeRatio == 100) {
1918 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1919 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1920 }
1921 #else // INCLUDE_ALL_GCS
1922 assert(verify_serial_gc_flags(), "SerialGC unset");
1923 #endif // INCLUDE_ALL_GCS
1924 }
1925
1926 julong Arguments::limit_by_allocatable_memory(julong limit) {
1927 julong max_allocatable;
1928 julong result = limit;
1929 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1930 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1931 }
1932 return result;
1933 }
1934
1935 // Use static initialization to get the default before parsing
1936 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1937
1938 void Arguments::set_heap_size() {
1939 const julong phys_mem =
1940 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1941 : (julong)MaxRAM;
1942
1943 // If the maximum heap size has not been set with -Xmx,
1944 // then set it as fraction of the size of physical memory,
1945 // respecting the maximum and minimum sizes of the heap.
1946 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1947 julong reasonable_max = phys_mem / MaxRAMFraction;
1948
1949 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1950 // Small physical memory, so use a minimum fraction of it for the heap
1951 reasonable_max = phys_mem / MinRAMFraction;
1952 } else {
1953 // Not-small physical memory, so require a heap at least
1954 // as large as MaxHeapSize
1955 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1956 }
1957 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1958 // Limit the heap size to ErgoHeapSizeLimit
1959 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1960 }
1961 if (UseCompressedOops) {
1962 // Limit the heap size to the maximum possible when using compressed oops
1963 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1964
1965 // HeapBaseMinAddress can be greater than default but not less than.
1966 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1967 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1968 // matches compressed oops printing flags
1969 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1970 jio_fprintf(defaultStream::error_stream(),
1971 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1972 " (" UINTX_FORMAT "G) which is greater than value given "
1973 UINTX_FORMAT "\n",
1974 DefaultHeapBaseMinAddress,
1975 DefaultHeapBaseMinAddress/G,
1976 HeapBaseMinAddress);
1977 }
1978 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1979 }
1980 }
1981
1982 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1983 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1984 // but it should be not less than default MaxHeapSize.
1985 max_coop_heap -= HeapBaseMinAddress;
1986 }
1987 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1988 }
1989 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1990
1991 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1992 // An initial heap size was specified on the command line,
1993 // so be sure that the maximum size is consistent. Done
1994 // after call to limit_by_allocatable_memory because that
1995 // method might reduce the allocation size.
1996 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1997 }
1998
1999 if (PrintGCDetails && Verbose) {
2000 // Cannot use gclog_or_tty yet.
2001 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2002 }
2003 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
2004 }
2005
2006 // If the minimum or initial heap_size have not been set or requested to be set
2007 // ergonomically, set them accordingly.
2008 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2009 julong reasonable_minimum = (julong)(OldSize + NewSize);
2010
2011 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2012
2013 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2014
2015 if (InitialHeapSize == 0) {
2016 julong reasonable_initial = phys_mem / InitialRAMFraction;
2017
2018 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2019 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2020
2021 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2022
2023 if (PrintGCDetails && Verbose) {
2024 // Cannot use gclog_or_tty yet.
2025 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
2026 }
2027 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
2028 }
2029 // If the minimum heap size has not been set (via -Xms),
2030 // synchronize with InitialHeapSize to avoid errors with the default value.
2031 if (min_heap_size() == 0) {
2032 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
2033 if (PrintGCDetails && Verbose) {
2034 // Cannot use gclog_or_tty yet.
2035 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2036 }
2037 }
2038 }
2039 }
2040
2041 // This must be called after ergonomics because we want bytecode rewriting
2042 // if the server compiler is used, or if UseSharedSpaces is disabled.
2043 void Arguments::set_bytecode_flags() {
2044 // Better not attempt to store into a read-only space.
2045 if (UseSharedSpaces) {
2046 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2047 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2048 }
2049
2050 if (!RewriteBytecodes) {
2051 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2052 }
2053 }
2054
2055 // Aggressive optimization flags -XX:+AggressiveOpts
2056 void Arguments::set_aggressive_opts_flags() {
2057 #ifdef COMPILER2
2058 if (AggressiveUnboxing) {
2059 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2060 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2061 } else if (!EliminateAutoBox) {
2062 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2063 AggressiveUnboxing = false;
2064 }
2065 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2066 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2067 } else if (!DoEscapeAnalysis) {
2068 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2069 AggressiveUnboxing = false;
2070 }
2071 }
2072 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2073 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2074 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2075 }
2076 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2077 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2078 }
2079
2080 // Feed the cache size setting into the JDK
2081 char buffer[1024];
2082 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2083 add_property(buffer);
2084 }
2085 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2086 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2087 }
2088 #endif
2089
2090 if (AggressiveOpts) {
2091 // Sample flag setting code
2092 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2093 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2094 // }
2095 }
2096 }
2097
2098 //===========================================================================================================
2099 // Parsing of java.compiler property
2100
2101 void Arguments::process_java_compiler_argument(char* arg) {
2102 // For backwards compatibility, Djava.compiler=NONE or ""
2103 // causes us to switch to -Xint mode UNLESS -Xdebug
2104 // is also specified.
2105 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2106 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2107 }
2108 }
2109
2110 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2111 _sun_java_launcher = os::strdup_check_oom(launcher);
2112 }
2113
2114 bool Arguments::created_by_java_launcher() {
2115 assert(_sun_java_launcher != NULL, "property must have value");
2116 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2117 }
2118
2119 bool Arguments::sun_java_launcher_is_altjvm() {
2120 return _sun_java_launcher_is_altjvm;
2121 }
2122
2123 //===========================================================================================================
2124 // Parsing of main arguments
2125
2126 bool Arguments::verify_interval(uintx val, uintx min,
2127 uintx max, const char* name) {
2128 // Returns true iff value is in the inclusive interval [min..max]
2129 // false, otherwise.
2130 if (val >= min && val <= max) {
2131 return true;
2132 }
2133 jio_fprintf(defaultStream::error_stream(),
2134 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2135 " and " UINTX_FORMAT "\n",
2136 name, val, min, max);
2137 return false;
2138 }
2139
2140 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2141 // Returns true if given value is at least specified min threshold
2142 // false, otherwise.
2143 if (val >= min ) {
2144 return true;
2145 }
2146 jio_fprintf(defaultStream::error_stream(),
2147 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2148 name, val, min);
2149 return false;
2150 }
2151
2152 bool Arguments::verify_percentage(uintx value, const char* name) {
2153 if (is_percentage(value)) {
2154 return true;
2155 }
2156 jio_fprintf(defaultStream::error_stream(),
2157 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2158 name, value);
2159 return false;
2160 }
2161
2162 // check if do gclog rotation
2163 // +UseGCLogFileRotation is a must,
2164 // no gc log rotation when log file not supplied or
2165 // NumberOfGCLogFiles is 0
2166 void check_gclog_consistency() {
2167 if (UseGCLogFileRotation) {
2168 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2169 jio_fprintf(defaultStream::output_stream(),
2170 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2171 "where num_of_file > 0\n"
2172 "GC log rotation is turned off\n");
2173 UseGCLogFileRotation = false;
2174 }
2175 }
2176
2177 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2178 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2179 jio_fprintf(defaultStream::output_stream(),
2180 "GCLogFileSize changed to minimum 8K\n");
2181 }
2182 }
2183
2184 // This function is called for -Xloggc:<filename>, it can be used
2185 // to check if a given file name(or string) conforms to the following
2186 // specification:
2187 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2188 // %p and %t only allowed once. We only limit usage of filename not path
2189 bool is_filename_valid(const char *file_name) {
2190 const char* p = file_name;
2191 char file_sep = os::file_separator()[0];
2192 const char* cp;
2193 // skip prefix path
2194 for (cp = file_name; *cp != '\0'; cp++) {
2195 if (*cp == '/' || *cp == file_sep) {
2196 p = cp + 1;
2197 }
2198 }
2199
2200 int count_p = 0;
2201 int count_t = 0;
2202 while (*p != '\0') {
2203 if ((*p >= '0' && *p <= '9') ||
2204 (*p >= 'A' && *p <= 'Z') ||
2205 (*p >= 'a' && *p <= 'z') ||
2206 *p == '-' ||
2207 *p == '_' ||
2208 *p == '.') {
2209 p++;
2210 continue;
2211 }
2212 if (*p == '%') {
2213 if(*(p + 1) == 'p') {
2214 p += 2;
2215 count_p ++;
2216 continue;
2217 }
2218 if (*(p + 1) == 't') {
2219 p += 2;
2220 count_t ++;
2221 continue;
2222 }
2223 }
2224 return false;
2225 }
2226 return count_p < 2 && count_t < 2;
2227 }
2228
2229 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2230 if (!is_percentage(min_heap_free_ratio)) {
2231 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2232 return false;
2233 }
2234 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2235 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2236 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2237 MaxHeapFreeRatio);
2238 return false;
2239 }
2240 // This does not set the flag itself, but stores the value in a safe place for later usage.
2241 _min_heap_free_ratio = min_heap_free_ratio;
2242 return true;
2243 }
2244
2245 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2246 if (!is_percentage(max_heap_free_ratio)) {
2247 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2248 return false;
2249 }
2250 if (max_heap_free_ratio < MinHeapFreeRatio) {
2251 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2252 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2253 MinHeapFreeRatio);
2254 return false;
2255 }
2256 // This does not set the flag itself, but stores the value in a safe place for later usage.
2257 _max_heap_free_ratio = max_heap_free_ratio;
2258 return true;
2259 }
2260
2261 // Check consistency of GC selection
2262 bool Arguments::check_gc_consistency_user() {
2263 check_gclog_consistency();
2264 // Ensure that the user has not selected conflicting sets
2265 // of collectors.
2266 uint i = 0;
2267 if (UseSerialGC) i++;
2268 if (UseConcMarkSweepGC) i++;
2269 if (UseParallelGC || UseParallelOldGC) i++;
2270 if (UseG1GC) i++;
2271 if (i > 1) {
2272 jio_fprintf(defaultStream::error_stream(),
2273 "Conflicting collector combinations in option list; "
2274 "please refer to the release notes for the combinations "
2275 "allowed\n");
2276 return false;
2277 }
2278
2279 if (UseConcMarkSweepGC && !UseParNewGC) {
2280 jio_fprintf(defaultStream::error_stream(),
2281 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2282 return false;
2283 }
2284
2285 if (UseParNewGC && !UseConcMarkSweepGC) {
2286 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2287 // set up UseSerialGC properly, so that can't be used in the check here.
2288 jio_fprintf(defaultStream::error_stream(),
2289 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2290 return false;
2291 }
2292
2293 return true;
2294 }
2295
2296 // Check stack pages settings
2297 bool Arguments::check_stack_pages()
2298 {
2299 bool status = true;
2300 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2301 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2302 // greater stack shadow pages can't generate instruction to bang stack
2303 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2304 return status;
2305 }
2306
2307 // Check the consistency of vm_init_args
2308 bool Arguments::check_vm_args_consistency() {
2309 // Method for adding checks for flag consistency.
2310 // The intent is to warn the user of all possible conflicts,
2311 // before returning an error.
2312 // Note: Needs platform-dependent factoring.
2313 bool status = true;
2314
2315 if (TLABRefillWasteFraction == 0) {
2316 jio_fprintf(defaultStream::error_stream(),
2317 "TLABRefillWasteFraction should be a denominator, "
2318 "not " SIZE_FORMAT "\n",
2319 TLABRefillWasteFraction);
2320 status = false;
2321 }
2322
2323 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2324 "AdaptiveSizePolicyWeight");
2325 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2326
2327 // Divide by bucket size to prevent a large size from causing rollover when
2328 // calculating amount of memory needed to be allocated for the String table.
2329 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2330 (max_uintx / StringTable::bucket_size()), "StringTable size");
2331
2332 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2333 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2334
2335 {
2336 // Using "else if" below to avoid printing two error messages if min > max.
2337 // This will also prevent us from reporting both min>100 and max>100 at the
2338 // same time, but that is less annoying than printing two identical errors IMHO.
2339 FormatBuffer<80> err_msg("%s","");
2340 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2341 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2342 status = false;
2343 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2344 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2345 status = false;
2346 }
2347 }
2348
2349 // Min/MaxMetaspaceFreeRatio
2350 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2351 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2352
2353 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2356 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2357 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2358 MinMetaspaceFreeRatio,
2359 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2360 MaxMetaspaceFreeRatio);
2361 status = false;
2362 }
2363
2364 // Trying to keep 100% free is not practical
2365 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2366
2367 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2368 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2369 }
2370
2371 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2372 // Settings to encourage splitting.
2373 if (!FLAG_IS_CMDLINE(NewRatio)) {
2374 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2375 }
2376 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2377 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2378 }
2379 }
2380
2381 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2382 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2383 }
2384
2385 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2386 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2387 if (GCTimeLimit == 100) {
2388 // Turn off gc-overhead-limit-exceeded checks
2389 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2390 }
2391
2392 status = status && check_gc_consistency_user();
2393 status = status && check_stack_pages();
2394
2395 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2396 "CMSIncrementalSafetyFactor");
2397
2398 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2399 // insists that we hold the requisite locks so that the iteration is
2400 // MT-safe. For the verification at start-up and shut-down, we don't
2401 // yet have a good way of acquiring and releasing these locks,
2402 // which are not visible at the CollectedHeap level. We want to
2403 // be able to acquire these locks and then do the iteration rather
2404 // than just disable the lock verification. This will be fixed under
2405 // bug 4788986.
2406 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2407 if (VerifyDuringStartup) {
2408 warning("Heap verification at start-up disabled "
2409 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2410 VerifyDuringStartup = false; // Disable verification at start-up
2411 }
2412
2413 if (VerifyBeforeExit) {
2414 warning("Heap verification at shutdown disabled "
2415 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2416 VerifyBeforeExit = false; // Disable verification at shutdown
2417 }
2418 }
2419
2420 // Note: only executed in non-PRODUCT mode
2421 if (!UseAsyncConcMarkSweepGC &&
2422 (ExplicitGCInvokesConcurrent ||
2423 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2426 " with -UseAsyncConcMarkSweepGC");
2427 status = false;
2428 }
2429
2430 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2431
2432 #if INCLUDE_ALL_GCS
2433 if (UseG1GC) {
2434 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2435 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2436 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2437
2438 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2439 "InitiatingHeapOccupancyPercent");
2440 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2441 "G1RefProcDrainInterval");
2442 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2443 "G1ConcMarkStepDurationMillis");
2444 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2445 "G1ConcRSHotCardLimit");
2446 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2447 "G1ConcRSLogCacheSize");
2448 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2449 "StringDeduplicationAgeThreshold");
2450 }
2451 if (UseConcMarkSweepGC) {
2452 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2453 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2454 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2455 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2456
2457 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2458
2459 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2460 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2461 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2462
2463 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2464
2465 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2466 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2467
2468 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2469 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2470 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2471
2472 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2473
2474 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2475
2476 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2477 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2478 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2479 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2480 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2481 }
2482
2483 if (UseParallelGC || UseParallelOldGC) {
2484 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2485 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2486
2487 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2488 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2489
2490 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2491 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2492
2493 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2494
2495 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2496 }
2497 #endif // INCLUDE_ALL_GCS
2498
2499 status = status && verify_interval(RefDiscoveryPolicy,
2500 ReferenceProcessor::DiscoveryPolicyMin,
2501 ReferenceProcessor::DiscoveryPolicyMax,
2502 "RefDiscoveryPolicy");
2503
2504 // Limit the lower bound of this flag to 1 as it is used in a division
2505 // expression.
2506 status = status && verify_interval(TLABWasteTargetPercent,
2507 1, 100, "TLABWasteTargetPercent");
2508
2509 status = status && verify_object_alignment();
2510
2511 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2512 "CompressedClassSpaceSize");
2513
2514 status = status && verify_interval(MarkStackSizeMax,
2515 1, (max_jint - 1), "MarkStackSizeMax");
2516 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2517
2518 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2519
2520 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2521
2522 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2523
2524 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2525 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2526
2527 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2528
2529 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2530 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2531 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2532
2533 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2534 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2535
2536 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2537 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2538 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2539
2540 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2541 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2542
2543 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2544 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2545 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2546 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2547
2548 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2549 #ifdef COMPILER1
2550 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2551 #endif
2552 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2553
2554 if (PrintNMTStatistics) {
2555 #if INCLUDE_NMT
2556 if (MemTracker::tracking_level() == NMT_off) {
2557 #endif // INCLUDE_NMT
2558 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2559 PrintNMTStatistics = false;
2560 #if INCLUDE_NMT
2561 }
2562 #endif
2563 }
2564
2565 // Need to limit the extent of the padding to reasonable size.
2566 // 8K is well beyond the reasonable HW cache line size, even with the
2567 // aggressive prefetching, while still leaving the room for segregating
2568 // among the distinct pages.
2569 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2570 jio_fprintf(defaultStream::error_stream(),
2571 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2572 ContendedPaddingWidth, 0, 8192);
2573 status = false;
2574 }
2575
2576 // Need to enforce the padding not to break the existing field alignments.
2577 // It is sufficient to check against the largest type size.
2578 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2579 jio_fprintf(defaultStream::error_stream(),
2580 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2581 ContendedPaddingWidth, BytesPerLong);
2582 status = false;
2583 }
2584
2585 // Check lower bounds of the code cache
2586 // Template Interpreter code is approximately 3X larger in debug builds.
2587 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2588 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2591 os::vm_page_size()/K);
2592 status = false;
2593 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2596 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2597 status = false;
2598 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2601 min_code_cache_size/K);
2602 status = false;
2603 } else if (ReservedCodeCacheSize > 2*G) {
2604 // Code cache size larger than MAXINT is not supported.
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2607 (2*G)/M);
2608 status = false;
2609 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2612 min_code_cache_size/K);
2613 status = false;
2614 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2615 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2618 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2619 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2620 status = false;
2621 }
2622
2623 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2624 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2625 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2626 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2627
2628
2629 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2630 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2631 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2632 // Check the minimum number of compiler threads
2633 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2634
2635 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2636 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2637 }
2638
2639 return status;
2640 }
2641
2642 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2643 const char* option_type) {
2644 if (ignore) return false;
2645
2646 const char* spacer = " ";
2647 if (option_type == NULL) {
2648 option_type = ++spacer; // Set both to the empty string.
2649 }
2650
2651 if (os::obsolete_option(option)) {
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Obsolete %s%soption: %s\n", option_type, spacer,
2654 option->optionString);
2655 return false;
2656 } else {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Unrecognized %s%soption: %s\n", option_type, spacer,
2659 option->optionString);
2660 return true;
2661 }
2662 }
2663
2664 static const char* user_assertion_options[] = {
2665 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2666 };
2667
2668 static const char* system_assertion_options[] = {
2669 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2670 };
2671
2672 bool Arguments::parse_uintx(const char* value,
2673 uintx* uintx_arg,
2674 uintx min_size) {
2675
2676 // Check the sign first since atomull() parses only unsigned values.
2677 bool value_is_positive = !(*value == '-');
2678
2679 if (value_is_positive) {
2680 julong n;
2681 bool good_return = atomull(value, &n);
2682 if (good_return) {
2683 bool above_minimum = n >= min_size;
2684 bool value_is_too_large = n > max_uintx;
2685
2686 if (above_minimum && !value_is_too_large) {
2687 *uintx_arg = n;
2688 return true;
2689 }
2690 }
2691 }
2692 return false;
2693 }
2694
2695 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2696 julong* long_arg,
2697 julong min_size) {
2698 if (!atomull(s, long_arg)) return arg_unreadable;
2699 return check_memory_size(*long_arg, min_size);
2700 }
2701
2702 // Parse JavaVMInitArgs structure
2703
2704 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2705 // For components of the system classpath.
2706 SysClassPath scp(Arguments::get_sysclasspath());
2707 bool scp_assembly_required = false;
2708
2709 // Save default settings for some mode flags
2710 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2711 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2712 Arguments::_ClipInlining = ClipInlining;
2713 Arguments::_BackgroundCompilation = BackgroundCompilation;
2714
2715 // Setup flags for mixed which is the default
2716 set_mode_flags(_mixed);
2717
2718 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2719 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2720 if (result != JNI_OK) {
2721 return result;
2722 }
2723
2724 // Parse JavaVMInitArgs structure passed in
2725 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2726 if (result != JNI_OK) {
2727 return result;
2728 }
2729
2730 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2731 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2732 if (result != JNI_OK) {
2733 return result;
2734 }
2735
2736 // Do final processing now that all arguments have been parsed
2737 result = finalize_vm_init_args(&scp, scp_assembly_required);
2738 if (result != JNI_OK) {
2739 return result;
2740 }
2741
2742 return JNI_OK;
2743 }
2744
2745 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2746 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2747 // are dealing with -agentpath (case where name is a path), otherwise with
2748 // -agentlib
2749 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2750 char *_name;
2751 const char *_hprof = "hprof", *_jdwp = "jdwp";
2752 size_t _len_hprof, _len_jdwp, _len_prefix;
2753
2754 if (is_path) {
2755 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2756 return false;
2757 }
2758
2759 _name++; // skip past last path separator
2760 _len_prefix = strlen(JNI_LIB_PREFIX);
2761
2762 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2763 return false;
2764 }
2765
2766 _name += _len_prefix;
2767 _len_hprof = strlen(_hprof);
2768 _len_jdwp = strlen(_jdwp);
2769
2770 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2771 _name += _len_hprof;
2772 }
2773 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2774 _name += _len_jdwp;
2775 }
2776 else {
2777 return false;
2778 }
2779
2780 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2781 return false;
2782 }
2783
2784 return true;
2785 }
2786
2787 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2788 return true;
2789 }
2790
2791 return false;
2792 }
2793
2794 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2795 SysClassPath* scp_p,
2796 bool* scp_assembly_required_p,
2797 Flag::Flags origin) {
2798 // Remaining part of option string
2799 const char* tail;
2800
2801 // iterate over arguments
2802 for (int index = 0; index < args->nOptions; index++) {
2803 bool is_absolute_path = false; // for -agentpath vs -agentlib
2804
2805 const JavaVMOption* option = args->options + index;
2806
2807 if (!match_option(option, "-Djava.class.path", &tail) &&
2808 !match_option(option, "-Dsun.java.command", &tail) &&
2809 !match_option(option, "-Dsun.java.launcher", &tail)) {
2810
2811 // add all jvm options to the jvm_args string. This string
2812 // is used later to set the java.vm.args PerfData string constant.
2813 // the -Djava.class.path and the -Dsun.java.command options are
2814 // omitted from jvm_args string as each have their own PerfData
2815 // string constant object.
2816 build_jvm_args(option->optionString);
2817 }
2818
2819 // -verbose:[class/gc/jni]
2820 if (match_option(option, "-verbose", &tail)) {
2821 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2822 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2823 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2824 } else if (!strcmp(tail, ":gc")) {
2825 FLAG_SET_CMDLINE(bool, PrintGC, true);
2826 } else if (!strcmp(tail, ":jni")) {
2827 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2828 }
2829 // -da / -ea / -disableassertions / -enableassertions
2830 // These accept an optional class/package name separated by a colon, e.g.,
2831 // -da:java.lang.Thread.
2832 } else if (match_option(option, user_assertion_options, &tail, true)) {
2833 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2834 if (*tail == '\0') {
2835 JavaAssertions::setUserClassDefault(enable);
2836 } else {
2837 assert(*tail == ':', "bogus match by match_option()");
2838 JavaAssertions::addOption(tail + 1, enable);
2839 }
2840 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2841 } else if (match_option(option, system_assertion_options, &tail, false)) {
2842 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2843 JavaAssertions::setSystemClassDefault(enable);
2844 // -bootclasspath:
2845 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2846 scp_p->reset_path(tail);
2847 *scp_assembly_required_p = true;
2848 // -bootclasspath/a:
2849 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2850 scp_p->add_suffix(tail);
2851 *scp_assembly_required_p = true;
2852 // -bootclasspath/p:
2853 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2854 scp_p->add_prefix(tail);
2855 *scp_assembly_required_p = true;
2856 // -Xrun
2857 } else if (match_option(option, "-Xrun", &tail)) {
2858 if (tail != NULL) {
2859 const char* pos = strchr(tail, ':');
2860 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2861 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2862 name[len] = '\0';
2863
2864 char *options = NULL;
2865 if(pos != NULL) {
2866 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2867 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2868 }
2869 #if !INCLUDE_JVMTI
2870 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Profiling and debugging agents are not supported in this VM\n");
2873 return JNI_ERR;
2874 }
2875 #endif // !INCLUDE_JVMTI
2876 add_init_library(name, options);
2877 }
2878 // -agentlib and -agentpath
2879 } else if (match_option(option, "-agentlib:", &tail) ||
2880 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2881 if(tail != NULL) {
2882 const char* pos = strchr(tail, '=');
2883 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2884 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2885 name[len] = '\0';
2886
2887 char *options = NULL;
2888 if(pos != NULL) {
2889 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2890 }
2891 #if !INCLUDE_JVMTI
2892 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2893 jio_fprintf(defaultStream::error_stream(),
2894 "Profiling and debugging agents are not supported in this VM\n");
2895 return JNI_ERR;
2896 }
2897 #endif // !INCLUDE_JVMTI
2898 add_init_agent(name, options, is_absolute_path);
2899 }
2900 // -javaagent
2901 } else if (match_option(option, "-javaagent:", &tail)) {
2902 #if !INCLUDE_JVMTI
2903 jio_fprintf(defaultStream::error_stream(),
2904 "Instrumentation agents are not supported in this VM\n");
2905 return JNI_ERR;
2906 #else
2907 if(tail != NULL) {
2908 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2909 add_init_agent("instrument", options, false);
2910 }
2911 #endif // !INCLUDE_JVMTI
2912 // -Xnoclassgc
2913 } else if (match_option(option, "-Xnoclassgc")) {
2914 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2915 // -Xconcgc
2916 } else if (match_option(option, "-Xconcgc")) {
2917 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2918 // -Xnoconcgc
2919 } else if (match_option(option, "-Xnoconcgc")) {
2920 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2921 // -Xbatch
2922 } else if (match_option(option, "-Xbatch")) {
2923 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2924 // -Xmn for compatibility with other JVM vendors
2925 } else if (match_option(option, "-Xmn", &tail)) {
2926 julong long_initial_young_size = 0;
2927 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid initial young generation size: %s\n", option->optionString);
2931 describe_range_error(errcode);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2935 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2936 // -Xms
2937 } else if (match_option(option, "-Xms", &tail)) {
2938 julong long_initial_heap_size = 0;
2939 // an initial heap size of 0 means automatically determine
2940 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2941 if (errcode != arg_in_range) {
2942 jio_fprintf(defaultStream::error_stream(),
2943 "Invalid initial heap size: %s\n", option->optionString);
2944 describe_range_error(errcode);
2945 return JNI_EINVAL;
2946 }
2947 set_min_heap_size((uintx)long_initial_heap_size);
2948 // Currently the minimum size and the initial heap sizes are the same.
2949 // Can be overridden with -XX:InitialHeapSize.
2950 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2951 // -Xmx
2952 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2953 julong long_max_heap_size = 0;
2954 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2955 if (errcode != arg_in_range) {
2956 jio_fprintf(defaultStream::error_stream(),
2957 "Invalid maximum heap size: %s\n", option->optionString);
2958 describe_range_error(errcode);
2959 return JNI_EINVAL;
2960 }
2961 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2962 // Xmaxf
2963 } else if (match_option(option, "-Xmaxf", &tail)) {
2964 char* err;
2965 int maxf = (int)(strtod(tail, &err) * 100);
2966 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Bad max heap free percentage size: %s\n",
2969 option->optionString);
2970 return JNI_EINVAL;
2971 } else {
2972 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2973 }
2974 // Xminf
2975 } else if (match_option(option, "-Xminf", &tail)) {
2976 char* err;
2977 int minf = (int)(strtod(tail, &err) * 100);
2978 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Bad min heap free percentage size: %s\n",
2981 option->optionString);
2982 return JNI_EINVAL;
2983 } else {
2984 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2985 }
2986 // -Xss
2987 } else if (match_option(option, "-Xss", &tail)) {
2988 julong long_ThreadStackSize = 0;
2989 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2990 if (errcode != arg_in_range) {
2991 jio_fprintf(defaultStream::error_stream(),
2992 "Invalid thread stack size: %s\n", option->optionString);
2993 describe_range_error(errcode);
2994 return JNI_EINVAL;
2995 }
2996 // Internally track ThreadStackSize in units of 1024 bytes.
2997 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2998 round_to((int)long_ThreadStackSize, K) / K);
2999 // -Xoss
3000 } else if (match_option(option, "-Xoss", &tail)) {
3001 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3002 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3003 julong long_CodeCacheExpansionSize = 0;
3004 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3005 if (errcode != arg_in_range) {
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3008 os::vm_page_size()/K);
3009 return JNI_EINVAL;
3010 }
3011 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3012 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3013 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3014 julong long_ReservedCodeCacheSize = 0;
3015
3016 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3017 if (errcode != arg_in_range) {
3018 jio_fprintf(defaultStream::error_stream(),
3019 "Invalid maximum code cache size: %s.\n", option->optionString);
3020 return JNI_EINVAL;
3021 }
3022 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3023 // -XX:NonNMethodCodeHeapSize=
3024 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3025 julong long_NonNMethodCodeHeapSize = 0;
3026
3027 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3028 if (errcode != arg_in_range) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3031 return JNI_EINVAL;
3032 }
3033 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
3034 // -XX:ProfiledCodeHeapSize=
3035 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3036 julong long_ProfiledCodeHeapSize = 0;
3037
3038 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3042 return JNI_EINVAL;
3043 }
3044 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
3045 // -XX:NonProfiledCodeHeapSizee=
3046 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3047 julong long_NonProfiledCodeHeapSize = 0;
3048
3049 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3050 if (errcode != arg_in_range) {
3051 jio_fprintf(defaultStream::error_stream(),
3052 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3053 return JNI_EINVAL;
3054 }
3055 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
3056 //-XX:IncreaseFirstTierCompileThresholdAt=
3057 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3058 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3059 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3060 jio_fprintf(defaultStream::error_stream(),
3061 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3062 option->optionString);
3063 return JNI_EINVAL;
3064 }
3065 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3066 // -green
3067 } else if (match_option(option, "-green")) {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "Green threads support not available\n");
3070 return JNI_EINVAL;
3071 // -native
3072 } else if (match_option(option, "-native")) {
3073 // HotSpot always uses native threads, ignore silently for compatibility
3074 // -Xsqnopause
3075 } else if (match_option(option, "-Xsqnopause")) {
3076 // EVM option, ignore silently for compatibility
3077 // -Xrs
3078 } else if (match_option(option, "-Xrs")) {
3079 // Classic/EVM option, new functionality
3080 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3081 } else if (match_option(option, "-Xusealtsigs")) {
3082 // change default internal VM signals used - lower case for back compat
3083 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3084 // -Xoptimize
3085 } else if (match_option(option, "-Xoptimize")) {
3086 // EVM option, ignore silently for compatibility
3087 // -Xprof
3088 } else if (match_option(option, "-Xprof")) {
3089 #if INCLUDE_FPROF
3090 _has_profile = true;
3091 #else // INCLUDE_FPROF
3092 jio_fprintf(defaultStream::error_stream(),
3093 "Flat profiling is not supported in this VM.\n");
3094 return JNI_ERR;
3095 #endif // INCLUDE_FPROF
3096 // -Xconcurrentio
3097 } else if (match_option(option, "-Xconcurrentio")) {
3098 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3099 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3100 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3101 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3102 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3103
3104 // -Xinternalversion
3105 } else if (match_option(option, "-Xinternalversion")) {
3106 jio_fprintf(defaultStream::output_stream(), "%s\n",
3107 VM_Version::internal_vm_info_string());
3108 vm_exit(0);
3109 #ifndef PRODUCT
3110 // -Xprintflags
3111 } else if (match_option(option, "-Xprintflags")) {
3112 CommandLineFlags::printFlags(tty, false);
3113 vm_exit(0);
3114 #endif
3115 // -D
3116 } else if (match_option(option, "-D", &tail)) {
3117 const char* value;
3118 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3119 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3120 // abort if -Djava.endorsed.dirs is set
3121 jio_fprintf(defaultStream::output_stream(),
3122 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3123 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3124 return JNI_EINVAL;
3125 }
3126 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3127 *value != '\0' && strcmp(value, "\"\"") != 0) {
3128 // abort if -Djava.ext.dirs is set
3129 jio_fprintf(defaultStream::output_stream(),
3130 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3131 return JNI_EINVAL;
3132 }
3133
3134 if (!add_property(tail)) {
3135 return JNI_ENOMEM;
3136 }
3137 // Out of the box management support
3138 if (match_option(option, "-Dcom.sun.management", &tail)) {
3139 #if INCLUDE_MANAGEMENT
3140 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3141 #else
3142 jio_fprintf(defaultStream::output_stream(),
3143 "-Dcom.sun.management is not supported in this VM.\n");
3144 return JNI_ERR;
3145 #endif
3146 }
3147 // -Xint
3148 } else if (match_option(option, "-Xint")) {
3149 set_mode_flags(_int);
3150 // -Xmixed
3151 } else if (match_option(option, "-Xmixed")) {
3152 set_mode_flags(_mixed);
3153 // -Xcomp
3154 } else if (match_option(option, "-Xcomp")) {
3155 // for testing the compiler; turn off all flags that inhibit compilation
3156 set_mode_flags(_comp);
3157 // -Xshare:dump
3158 } else if (match_option(option, "-Xshare:dump")) {
3159 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3160 set_mode_flags(_int); // Prevent compilation, which creates objects
3161 // -Xshare:on
3162 } else if (match_option(option, "-Xshare:on")) {
3163 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3164 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3165 // -Xshare:auto
3166 } else if (match_option(option, "-Xshare:auto")) {
3167 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3168 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3169 // -Xshare:off
3170 } else if (match_option(option, "-Xshare:off")) {
3171 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3172 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3173 // -Xverify
3174 } else if (match_option(option, "-Xverify", &tail)) {
3175 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3176 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3177 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3178 } else if (strcmp(tail, ":remote") == 0) {
3179 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3180 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3181 } else if (strcmp(tail, ":none") == 0) {
3182 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3183 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3184 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3185 return JNI_EINVAL;
3186 }
3187 // -Xdebug
3188 } else if (match_option(option, "-Xdebug")) {
3189 // note this flag has been used, then ignore
3190 set_xdebug_mode(true);
3191 // -Xnoagent
3192 } else if (match_option(option, "-Xnoagent")) {
3193 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3194 } else if (match_option(option, "-Xboundthreads")) {
3195 // Bind user level threads to kernel threads (Solaris only)
3196 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3197 } else if (match_option(option, "-Xloggc:", &tail)) {
3198 // Redirect GC output to the file. -Xloggc:<filename>
3199 // ostream_init_log(), when called will use this filename
3200 // to initialize a fileStream.
3201 _gc_log_filename = os::strdup_check_oom(tail);
3202 if (!is_filename_valid(_gc_log_filename)) {
3203 jio_fprintf(defaultStream::output_stream(),
3204 "Invalid file name for use with -Xloggc: Filename can only contain the "
3205 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3206 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3207 return JNI_EINVAL;
3208 }
3209 FLAG_SET_CMDLINE(bool, PrintGC, true);
3210 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3211
3212 // JNI hooks
3213 } else if (match_option(option, "-Xcheck", &tail)) {
3214 if (!strcmp(tail, ":jni")) {
3215 #if !INCLUDE_JNI_CHECK
3216 warning("JNI CHECKING is not supported in this VM");
3217 #else
3218 CheckJNICalls = true;
3219 #endif // INCLUDE_JNI_CHECK
3220 } else if (is_bad_option(option, args->ignoreUnrecognized,
3221 "check")) {
3222 return JNI_EINVAL;
3223 }
3224 } else if (match_option(option, "vfprintf")) {
3225 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3226 } else if (match_option(option, "exit")) {
3227 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3228 } else if (match_option(option, "abort")) {
3229 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3230 // -XX:+AggressiveHeap
3231 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3232
3233 // This option inspects the machine and attempts to set various
3234 // parameters to be optimal for long-running, memory allocation
3235 // intensive jobs. It is intended for machines with large
3236 // amounts of cpu and memory.
3237
3238 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3239 // VM, but we may not be able to represent the total physical memory
3240 // available (like having 8gb of memory on a box but using a 32bit VM).
3241 // Thus, we need to make sure we're using a julong for intermediate
3242 // calculations.
3243 julong initHeapSize;
3244 julong total_memory = os::physical_memory();
3245
3246 if (total_memory < (julong)256*M) {
3247 jio_fprintf(defaultStream::error_stream(),
3248 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3249 vm_exit(1);
3250 }
3251
3252 // The heap size is half of available memory, or (at most)
3253 // all of possible memory less 160mb (leaving room for the OS
3254 // when using ISM). This is the maximum; because adaptive sizing
3255 // is turned on below, the actual space used may be smaller.
3256
3257 initHeapSize = MIN2(total_memory / (julong)2,
3258 total_memory - (julong)160*M);
3259
3260 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3261
3262 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3263 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3264 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3265 // Currently the minimum size and the initial heap sizes are the same.
3266 set_min_heap_size(initHeapSize);
3267 }
3268 if (FLAG_IS_DEFAULT(NewSize)) {
3269 // Make the young generation 3/8ths of the total heap.
3270 FLAG_SET_CMDLINE(uintx, NewSize,
3271 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3272 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3273 }
3274
3275 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3276 FLAG_SET_DEFAULT(UseLargePages, true);
3277 #endif
3278
3279 // Increase some data structure sizes for efficiency
3280 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3281 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3282 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3283
3284 // See the OldPLABSize comment below, but replace 'after promotion'
3285 // with 'after copying'. YoungPLABSize is the size of the survivor
3286 // space per-gc-thread buffers. The default is 4kw.
3287 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3288
3289 // OldPLABSize is the size of the buffers in the old gen that
3290 // UseParallelGC uses to promote live data that doesn't fit in the
3291 // survivor spaces. At any given time, there's one for each gc thread.
3292 // The default size is 1kw. These buffers are rarely used, since the
3293 // survivor spaces are usually big enough. For specjbb, however, there
3294 // are occasions when there's lots of live data in the young gen
3295 // and we end up promoting some of it. We don't have a definite
3296 // explanation for why bumping OldPLABSize helps, but the theory
3297 // is that a bigger PLAB results in retaining something like the
3298 // original allocation order after promotion, which improves mutator
3299 // locality. A minor effect may be that larger PLABs reduce the
3300 // number of PLAB allocation events during gc. The value of 8kw
3301 // was arrived at by experimenting with specjbb.
3302 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3303
3304 // Enable parallel GC and adaptive generation sizing
3305 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3306 FLAG_SET_DEFAULT(ParallelGCThreads,
3307 Abstract_VM_Version::parallel_worker_threads());
3308
3309 // Encourage steady state memory management
3310 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3311
3312 // This appears to improve mutator locality
3313 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3314
3315 // Get around early Solaris scheduling bug
3316 // (affinity vs other jobs on system)
3317 // but disallow DR and offlining (5008695).
3318 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3319
3320 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3321 // and the last option wins.
3322 } else if (match_option(option, "-XX:+NeverTenure")) {
3323 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3324 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3325 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3326 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3327 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3328 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3329 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3330 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3331 uintx max_tenuring_thresh = 0;
3332 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3333 jio_fprintf(defaultStream::error_stream(),
3334 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3335 }
3336 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3337
3338 if (MaxTenuringThreshold == 0) {
3339 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3340 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3341 } else {
3342 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3343 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3344 }
3345 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3346 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3347 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3348 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3349 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3350 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3351 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3352 #if defined(DTRACE_ENABLED)
3353 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3354 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3355 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3356 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3357 #else // defined(DTRACE_ENABLED)
3358 jio_fprintf(defaultStream::error_stream(),
3359 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3360 return JNI_EINVAL;
3361 #endif // defined(DTRACE_ENABLED)
3362 #ifdef ASSERT
3363 } else if (match_option(option, "-XX:+FullGCALot")) {
3364 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3365 // disable scavenge before parallel mark-compact
3366 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3367 #endif
3368 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3369 julong max_direct_memory_size = 0;
3370 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3371 if (errcode != arg_in_range) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "Invalid maximum direct memory size: %s\n",
3374 option->optionString);
3375 describe_range_error(errcode);
3376 return JNI_EINVAL;
3377 }
3378 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3379 #if !INCLUDE_MANAGEMENT
3380 } else if (match_option(option, "-XX:+ManagementServer")) {
3381 jio_fprintf(defaultStream::error_stream(),
3382 "ManagementServer is not supported in this VM.\n");
3383 return JNI_ERR;
3384 #endif // INCLUDE_MANAGEMENT
3385 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3386 // Skip -XX:Flags= since that case has already been handled
3387 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3388 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3389 return JNI_EINVAL;
3390 }
3391 }
3392 // Unknown option
3393 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3394 return JNI_ERR;
3395 }
3396 }
3397
3398 // PrintSharedArchiveAndExit will turn on
3399 // -Xshare:on
3400 // -XX:+TraceClassPaths
3401 if (PrintSharedArchiveAndExit) {
3402 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3403 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3404 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3405 }
3406
3407 // Change the default value for flags which have different default values
3408 // when working with older JDKs.
3409 #ifdef LINUX
3410 if (JDK_Version::current().compare_major(6) <= 0 &&
3411 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3412 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3413 }
3414 #endif // LINUX
3415 fix_appclasspath();
3416 return JNI_OK;
3417 }
3418
3419 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3420 //
3421 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3422 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3423 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3424 // path is treated as the current directory.
3425 //
3426 // This causes problems with CDS, which requires that all directories specified in the classpath
3427 // must be empty. In most cases, applications do NOT want to load classes from the current
3428 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3429 // scripts compatible with CDS.
3430 void Arguments::fix_appclasspath() {
3431 if (IgnoreEmptyClassPaths) {
3432 const char separator = *os::path_separator();
3433 const char* src = _java_class_path->value();
3434
3435 // skip over all the leading empty paths
3436 while (*src == separator) {
3437 src ++;
3438 }
3439
3440 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3441 strncpy(copy, src, strlen(src) + 1);
3442
3443 // trim all trailing empty paths
3444 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3445 *tail = '\0';
3446 }
3447
3448 char from[3] = {separator, separator, '\0'};
3449 char to [2] = {separator, '\0'};
3450 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3451 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3452 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3453 }
3454
3455 _java_class_path->set_value(copy);
3456 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3457 }
3458
3459 if (!PrintSharedArchiveAndExit) {
3460 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3461 }
3462 }
3463
3464 static bool has_jar_files(const char* directory) {
3465 DIR* dir = os::opendir(directory);
3466 if (dir == NULL) return false;
3467
3468 struct dirent *entry;
3469 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3470 bool hasJarFile = false;
3471 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3472 const char* name = entry->d_name;
3473 const char* ext = name + strlen(name) - 4;
3474 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3475 }
3476 FREE_C_HEAP_ARRAY(char, dbuf);
3477 os::closedir(dir);
3478 return hasJarFile ;
3479 }
3480
3481 static int check_non_empty_dirs(const char* path) {
3482 const char separator = *os::path_separator();
3483 const char* const end = path + strlen(path);
3484 int nonEmptyDirs = 0;
3485 while (path < end) {
3486 const char* tmp_end = strchr(path, separator);
3487 if (tmp_end == NULL) {
3488 if (has_jar_files(path)) {
3489 nonEmptyDirs++;
3490 jio_fprintf(defaultStream::output_stream(),
3491 "Non-empty directory: %s\n", path);
3492 }
3493 path = end;
3494 } else {
3495 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3496 memcpy(dirpath, path, tmp_end - path);
3497 dirpath[tmp_end - path] = '\0';
3498 if (has_jar_files(dirpath)) {
3499 nonEmptyDirs++;
3500 jio_fprintf(defaultStream::output_stream(),
3501 "Non-empty directory: %s\n", dirpath);
3502 }
3503 FREE_C_HEAP_ARRAY(char, dirpath);
3504 path = tmp_end + 1;
3505 }
3506 }
3507 return nonEmptyDirs;
3508 }
3509
3510 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3511 // check if the default lib/endorsed directory exists; if so, error
3512 char path[JVM_MAXPATHLEN];
3513 const char* fileSep = os::file_separator();
3514 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3515
3516 if (CheckEndorsedAndExtDirs) {
3517 int nonEmptyDirs = 0;
3518 // check endorsed directory
3519 nonEmptyDirs += check_non_empty_dirs(path);
3520 // check the extension directories
3521 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3522 if (nonEmptyDirs > 0) {
3523 return JNI_ERR;
3524 }
3525 }
3526
3527 DIR* dir = os::opendir(path);
3528 if (dir != NULL) {
3529 jio_fprintf(defaultStream::output_stream(),
3530 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3531 "in modular form will be supported via the concept of upgradeable modules.\n");
3532 os::closedir(dir);
3533 return JNI_ERR;
3534 }
3535
3536 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3537 dir = os::opendir(path);
3538 if (dir != NULL) {
3539 jio_fprintf(defaultStream::output_stream(),
3540 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3541 "Use -classpath instead.\n.");
3542 os::closedir(dir);
3543 return JNI_ERR;
3544 }
3545
3546 if (scp_assembly_required) {
3547 // Assemble the bootclasspath elements into the final path.
3548 Arguments::set_sysclasspath(scp_p->combined_path());
3549 }
3550
3551 // This must be done after all arguments have been processed.
3552 // java_compiler() true means set to "NONE" or empty.
3553 if (java_compiler() && !xdebug_mode()) {
3554 // For backwards compatibility, we switch to interpreted mode if
3555 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3556 // not specified.
3557 set_mode_flags(_int);
3558 }
3559
3560 if ((TieredCompilation && CompileThresholdScaling == 0)
3561 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3562 set_mode_flags(_int);
3563 }
3564
3565 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3566 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3567 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3568 }
3569
3570 #ifndef COMPILER2
3571 // Don't degrade server performance for footprint
3572 if (FLAG_IS_DEFAULT(UseLargePages) &&
3573 MaxHeapSize < LargePageHeapSizeThreshold) {
3574 // No need for large granularity pages w/small heaps.
3575 // Note that large pages are enabled/disabled for both the
3576 // Java heap and the code cache.
3577 FLAG_SET_DEFAULT(UseLargePages, false);
3578 }
3579
3580 #else
3581 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3582 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3583 }
3584 #endif
3585
3586 #ifndef TIERED
3587 // Tiered compilation is undefined.
3588 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3589 #endif
3590
3591 // If we are running in a headless jre, force java.awt.headless property
3592 // to be true unless the property has already been set.
3593 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3594 if (os::is_headless_jre()) {
3595 const char* headless = Arguments::get_property("java.awt.headless");
3596 if (headless == NULL) {
3597 char envbuffer[128];
3598 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3599 if (!add_property("java.awt.headless=true")) {
3600 return JNI_ENOMEM;
3601 }
3602 } else {
3603 char buffer[256];
3604 strcpy(buffer, "java.awt.headless=");
3605 strcat(buffer, envbuffer);
3606 if (!add_property(buffer)) {
3607 return JNI_ENOMEM;
3608 }
3609 }
3610 }
3611 }
3612
3613 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3614 // CMS can only be used with ParNew
3615 FLAG_SET_ERGO(bool, UseParNewGC, true);
3616 }
3617
3618 if (!check_vm_args_consistency()) {
3619 return JNI_ERR;
3620 }
3621
3622 return JNI_OK;
3623 }
3624
3625 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3626 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3627 scp_assembly_required_p);
3628 }
3629
3630 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3631 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3632 scp_assembly_required_p);
3633 }
3634
3635 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3636 const int N_MAX_OPTIONS = 64;
3637 const int OPTION_BUFFER_SIZE = 1024;
3638 char buffer[OPTION_BUFFER_SIZE];
3639
3640 // The variable will be ignored if it exceeds the length of the buffer.
3641 // Don't check this variable if user has special privileges
3642 // (e.g. unix su command).
3643 if (os::getenv(name, buffer, sizeof(buffer)) &&
3644 !os::have_special_privileges()) {
3645 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3646 jio_fprintf(defaultStream::error_stream(),
3647 "Picked up %s: %s\n", name, buffer);
3648 char* rd = buffer; // pointer to the input string (rd)
3649 int i;
3650 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3651 while (isspace(*rd)) rd++; // skip whitespace
3652 if (*rd == 0) break; // we re done when the input string is read completely
3653
3654 // The output, option string, overwrites the input string.
3655 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3656 // input string (rd).
3657 char* wrt = rd;
3658
3659 options[i++].optionString = wrt; // Fill in option
3660 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3661 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3662 int quote = *rd; // matching quote to look for
3663 rd++; // don't copy open quote
3664 while (*rd != quote) { // include everything (even spaces) up until quote
3665 if (*rd == 0) { // string termination means unmatched string
3666 jio_fprintf(defaultStream::error_stream(),
3667 "Unmatched quote in %s\n", name);
3668 return JNI_ERR;
3669 }
3670 *wrt++ = *rd++; // copy to option string
3671 }
3672 rd++; // don't copy close quote
3673 } else {
3674 *wrt++ = *rd++; // copy to option string
3675 }
3676 }
3677 // Need to check if we're done before writing a NULL,
3678 // because the write could be to the byte that rd is pointing to.
3679 if (*rd++ == 0) {
3680 *wrt = 0;
3681 break;
3682 }
3683 *wrt = 0; // Zero terminate option
3684 }
3685 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3686 JavaVMInitArgs vm_args;
3687 vm_args.version = JNI_VERSION_1_2;
3688 vm_args.options = options;
3689 vm_args.nOptions = i;
3690 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3691
3692 if (PrintVMOptions) {
3693 const char* tail;
3694 for (int i = 0; i < vm_args.nOptions; i++) {
3695 const JavaVMOption *option = vm_args.options + i;
3696 if (match_option(option, "-XX:", &tail)) {
3697 logOption(tail);
3698 }
3699 }
3700 }
3701
3702 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3703 }
3704 return JNI_OK;
3705 }
3706
3707 void Arguments::set_shared_spaces_flags() {
3708 if (DumpSharedSpaces) {
3709 if (RequireSharedSpaces) {
3710 warning("cannot dump shared archive while using shared archive");
3711 }
3712 UseSharedSpaces = false;
3713 #ifdef _LP64
3714 if (!UseCompressedOops || !UseCompressedClassPointers) {
3715 vm_exit_during_initialization(
3716 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3717 }
3718 } else {
3719 if (!UseCompressedOops || !UseCompressedClassPointers) {
3720 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3721 }
3722 #endif
3723 }
3724 }
3725
3726 #if !INCLUDE_ALL_GCS
3727 static void force_serial_gc() {
3728 FLAG_SET_DEFAULT(UseSerialGC, true);
3729 UNSUPPORTED_GC_OPTION(UseG1GC);
3730 UNSUPPORTED_GC_OPTION(UseParallelGC);
3731 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3732 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3733 UNSUPPORTED_GC_OPTION(UseParNewGC);
3734 }
3735 #endif // INCLUDE_ALL_GCS
3736
3737 // Sharing support
3738 // Construct the path to the archive
3739 static char* get_shared_archive_path() {
3740 char *shared_archive_path;
3741 if (SharedArchiveFile == NULL) {
3742 char jvm_path[JVM_MAXPATHLEN];
3743 os::jvm_path(jvm_path, sizeof(jvm_path));
3744 char *end = strrchr(jvm_path, *os::file_separator());
3745 if (end != NULL) *end = '\0';
3746 size_t jvm_path_len = strlen(jvm_path);
3747 size_t file_sep_len = strlen(os::file_separator());
3748 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3749 file_sep_len + 20, mtInternal);
3750 if (shared_archive_path != NULL) {
3751 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3752 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3753 strncat(shared_archive_path, "classes.jsa", 11);
3754 }
3755 } else {
3756 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3757 if (shared_archive_path != NULL) {
3758 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3759 }
3760 }
3761 return shared_archive_path;
3762 }
3763
3764 #ifndef PRODUCT
3765 // Determine whether LogVMOutput should be implicitly turned on.
3766 static bool use_vm_log() {
3767 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3768 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3769 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3770 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3771 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3772 return true;
3773 }
3774
3775 #ifdef COMPILER1
3776 if (PrintC1Statistics) {
3777 return true;
3778 }
3779 #endif // COMPILER1
3780
3781 #ifdef COMPILER2
3782 if (PrintOptoAssembly || PrintOptoStatistics) {
3783 return true;
3784 }
3785 #endif // COMPILER2
3786
3787 return false;
3788 }
3789 #endif // PRODUCT
3790
3791 // Parse entry point called from JNI_CreateJavaVM
3792
3793 jint Arguments::parse(const JavaVMInitArgs* args) {
3794
3795 // Remaining part of option string
3796 const char* tail;
3797
3798 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3799 const char* hotspotrc = ".hotspotrc";
3800 bool settings_file_specified = false;
3801 bool needs_hotspotrc_warning = false;
3802
3803 const char* flags_file;
3804 int index;
3805 for (index = 0; index < args->nOptions; index++) {
3806 const JavaVMOption *option = args->options + index;
3807 if (ArgumentsExt::process_options(option)) {
3808 continue;
3809 }
3810 if (match_option(option, "-XX:Flags=", &tail)) {
3811 flags_file = tail;
3812 settings_file_specified = true;
3813 continue;
3814 }
3815 if (match_option(option, "-XX:+PrintVMOptions")) {
3816 PrintVMOptions = true;
3817 continue;
3818 }
3819 if (match_option(option, "-XX:-PrintVMOptions")) {
3820 PrintVMOptions = false;
3821 continue;
3822 }
3823 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3824 IgnoreUnrecognizedVMOptions = true;
3825 continue;
3826 }
3827 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3828 IgnoreUnrecognizedVMOptions = false;
3829 continue;
3830 }
3831 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3832 CommandLineFlags::printFlags(tty, false);
3833 vm_exit(0);
3834 }
3835 #if INCLUDE_NMT
3836 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3837 // The launcher did not setup nmt environment variable properly.
3838 if (!MemTracker::check_launcher_nmt_support(tail)) {
3839 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3840 }
3841
3842 // Verify if nmt option is valid.
3843 if (MemTracker::verify_nmt_option()) {
3844 // Late initialization, still in single-threaded mode.
3845 if (MemTracker::tracking_level() >= NMT_summary) {
3846 MemTracker::init();
3847 }
3848 } else {
3849 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3850 }
3851 continue;
3852 }
3853 #endif
3854
3855
3856 #ifndef PRODUCT
3857 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3858 CommandLineFlags::printFlags(tty, true);
3859 vm_exit(0);
3860 }
3861 #endif
3862 }
3863
3864 if (IgnoreUnrecognizedVMOptions) {
3865 // uncast const to modify the flag args->ignoreUnrecognized
3866 *(jboolean*)(&args->ignoreUnrecognized) = true;
3867 }
3868
3869 // Parse specified settings file
3870 if (settings_file_specified) {
3871 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3872 return JNI_EINVAL;
3873 }
3874 } else {
3875 #ifdef ASSERT
3876 // Parse default .hotspotrc settings file
3877 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3878 return JNI_EINVAL;
3879 }
3880 #else
3881 struct stat buf;
3882 if (os::stat(hotspotrc, &buf) == 0) {
3883 needs_hotspotrc_warning = true;
3884 }
3885 #endif
3886 }
3887
3888 if (PrintVMOptions) {
3889 for (index = 0; index < args->nOptions; index++) {
3890 const JavaVMOption *option = args->options + index;
3891 if (match_option(option, "-XX:", &tail)) {
3892 logOption(tail);
3893 }
3894 }
3895 }
3896
3897 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3898 jint result = parse_vm_init_args(args);
3899 if (result != JNI_OK) {
3900 return result;
3901 }
3902
3903 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3904 SharedArchivePath = get_shared_archive_path();
3905 if (SharedArchivePath == NULL) {
3906 return JNI_ENOMEM;
3907 }
3908
3909 // Set up VerifySharedSpaces
3910 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3911 VerifySharedSpaces = true;
3912 }
3913
3914 // Delay warning until here so that we've had a chance to process
3915 // the -XX:-PrintWarnings flag
3916 if (needs_hotspotrc_warning) {
3917 warning("%s file is present but has been ignored. "
3918 "Run with -XX:Flags=%s to load the file.",
3919 hotspotrc, hotspotrc);
3920 }
3921
3922 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3923 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3924 #endif
3925
3926 #if INCLUDE_ALL_GCS
3927 #if (defined JAVASE_EMBEDDED || defined ARM)
3928 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3929 #endif
3930 #endif
3931
3932 #ifndef PRODUCT
3933 if (TraceBytecodesAt != 0) {
3934 TraceBytecodes = true;
3935 }
3936 if (CountCompiledCalls) {
3937 if (UseCounterDecay) {
3938 warning("UseCounterDecay disabled because CountCalls is set");
3939 UseCounterDecay = false;
3940 }
3941 }
3942 #endif // PRODUCT
3943
3944 if (ScavengeRootsInCode == 0) {
3945 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3946 warning("forcing ScavengeRootsInCode non-zero");
3947 }
3948 ScavengeRootsInCode = 1;
3949 }
3950
3951 if (PrintGCDetails) {
3952 // Turn on -verbose:gc options as well
3953 PrintGC = true;
3954 }
3955
3956 // Set object alignment values.
3957 set_object_alignment();
3958
3959 #if !INCLUDE_ALL_GCS
3960 force_serial_gc();
3961 #endif // INCLUDE_ALL_GCS
3962 #if !INCLUDE_CDS
3963 if (DumpSharedSpaces || RequireSharedSpaces) {
3964 jio_fprintf(defaultStream::error_stream(),
3965 "Shared spaces are not supported in this VM\n");
3966 return JNI_ERR;
3967 }
3968 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3969 warning("Shared spaces are not supported in this VM");
3970 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3971 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3972 }
3973 no_shared_spaces("CDS Disabled");
3974 #endif // INCLUDE_CDS
3975
3976 return JNI_OK;
3977 }
3978
3979 jint Arguments::apply_ergo() {
3980
3981 // Set flags based on ergonomics.
3982 set_ergonomics_flags();
3983
3984 set_shared_spaces_flags();
3985
3986 // Check the GC selections again.
3987 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3988 return JNI_EINVAL;
3989 }
3990
3991 if (TieredCompilation) {
3992 set_tiered_flags();
3993 } else {
3994 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3995 if (CompilationPolicyChoice >= 2) {
3996 vm_exit_during_initialization(
3997 "Incompatible compilation policy selected", NULL);
3998 }
3999 // Scale CompileThreshold
4000 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
4001 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
4002 }
4003 }
4004
4005 #ifdef COMPILER2
4006 #ifndef PRODUCT
4007 if (PrintIdealGraphLevel > 0) {
4008 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4009 }
4010 #endif
4011 #endif
4012
4013 // Set heap size based on available physical memory
4014 set_heap_size();
4015
4016 ArgumentsExt::set_gc_specific_flags();
4017
4018 // Initialize Metaspace flags and alignments
4019 Metaspace::ergo_initialize();
4020
4021 // Set bytecode rewriting flags
4022 set_bytecode_flags();
4023
4024 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4025 set_aggressive_opts_flags();
4026
4027 // Turn off biased locking for locking debug mode flags,
4028 // which are subtly different from each other but neither works with
4029 // biased locking
4030 if (UseHeavyMonitors
4031 #ifdef COMPILER1
4032 || !UseFastLocking
4033 #endif // COMPILER1
4034 ) {
4035 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4036 // flag set to true on command line; warn the user that they
4037 // can't enable biased locking here
4038 warning("Biased Locking is not supported with locking debug flags"
4039 "; ignoring UseBiasedLocking flag." );
4040 }
4041 UseBiasedLocking = false;
4042 }
4043
4044 #ifdef ZERO
4045 // Clear flags not supported on zero.
4046 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4047 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4048 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4049 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4050 #endif // CC_INTERP
4051
4052 #ifdef COMPILER2
4053 if (!EliminateLocks) {
4054 EliminateNestedLocks = false;
4055 }
4056 if (!Inline) {
4057 IncrementalInline = false;
4058 }
4059 #ifndef PRODUCT
4060 if (!IncrementalInline) {
4061 AlwaysIncrementalInline = false;
4062 }
4063 #endif
4064 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4065 // nothing to use the profiling, turn if off
4066 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4067 }
4068 #endif
4069
4070 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4071 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4072 DebugNonSafepoints = true;
4073 }
4074
4075 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4076 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4077 }
4078
4079 #ifndef PRODUCT
4080 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4081 if (use_vm_log()) {
4082 LogVMOutput = true;
4083 }
4084 }
4085 #endif // PRODUCT
4086
4087 if (PrintCommandLineFlags) {
4088 CommandLineFlags::printSetFlags(tty);
4089 }
4090
4091 // Apply CPU specific policy for the BiasedLocking
4092 if (UseBiasedLocking) {
4093 if (!VM_Version::use_biased_locking() &&
4094 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4095 UseBiasedLocking = false;
4096 }
4097 }
4098 #ifdef COMPILER2
4099 if (!UseBiasedLocking || EmitSync != 0) {
4100 UseOptoBiasInlining = false;
4101 }
4102 #endif
4103
4104 return JNI_OK;
4105 }
4106
4107 jint Arguments::adjust_after_os() {
4108 if (UseNUMA) {
4109 if (UseParallelGC || UseParallelOldGC) {
4110 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4111 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4112 }
4113 }
4114 // UseNUMAInterleaving is set to ON for all collectors and
4115 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4116 // such as the parallel collector for Linux and Solaris will
4117 // interleave old gen and survivor spaces on top of NUMA
4118 // allocation policy for the eden space.
4119 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4120 // all platforms and ParallelGC on Windows will interleave all
4121 // of the heap spaces across NUMA nodes.
4122 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4123 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4124 }
4125 }
4126 return JNI_OK;
4127 }
4128
4129 int Arguments::PropertyList_count(SystemProperty* pl) {
4130 int count = 0;
4131 while(pl != NULL) {
4132 count++;
4133 pl = pl->next();
4134 }
4135 return count;
4136 }
4137
4138 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4139 assert(key != NULL, "just checking");
4140 SystemProperty* prop;
4141 for (prop = pl; prop != NULL; prop = prop->next()) {
4142 if (strcmp(key, prop->key()) == 0) return prop->value();
4143 }
4144 return NULL;
4145 }
4146
4147 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4148 int count = 0;
4149 const char* ret_val = NULL;
4150
4151 while(pl != NULL) {
4152 if(count >= index) {
4153 ret_val = pl->key();
4154 break;
4155 }
4156 count++;
4157 pl = pl->next();
4158 }
4159
4160 return ret_val;
4161 }
4162
4163 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4164 int count = 0;
4165 char* ret_val = NULL;
4166
4167 while(pl != NULL) {
4168 if(count >= index) {
4169 ret_val = pl->value();
4170 break;
4171 }
4172 count++;
4173 pl = pl->next();
4174 }
4175
4176 return ret_val;
4177 }
4178
4179 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4180 SystemProperty* p = *plist;
4181 if (p == NULL) {
4182 *plist = new_p;
4183 } else {
4184 while (p->next() != NULL) {
4185 p = p->next();
4186 }
4187 p->set_next(new_p);
4188 }
4189 }
4190
4191 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4192 if (plist == NULL)
4193 return;
4194
4195 SystemProperty* new_p = new SystemProperty(k, v, true);
4196 PropertyList_add(plist, new_p);
4197 }
4198
4199 void Arguments::PropertyList_add(SystemProperty *element) {
4200 PropertyList_add(&_system_properties, element);
4201 }
4202
4203 // This add maintains unique property key in the list.
4204 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4205 if (plist == NULL)
4206 return;
4207
4208 // If property key exist then update with new value.
4209 SystemProperty* prop;
4210 for (prop = *plist; prop != NULL; prop = prop->next()) {
4211 if (strcmp(k, prop->key()) == 0) {
4212 if (append) {
4213 prop->append_value(v);
4214 } else {
4215 prop->set_value(v);
4216 }
4217 return;
4218 }
4219 }
4220
4221 PropertyList_add(plist, k, v);
4222 }
4223
4224 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4225 // Returns true if all of the source pointed by src has been copied over to
4226 // the destination buffer pointed by buf. Otherwise, returns false.
4227 // Notes:
4228 // 1. If the length (buflen) of the destination buffer excluding the
4229 // NULL terminator character is not long enough for holding the expanded
4230 // pid characters, it also returns false instead of returning the partially
4231 // expanded one.
4232 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4233 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4234 char* buf, size_t buflen) {
4235 const char* p = src;
4236 char* b = buf;
4237 const char* src_end = &src[srclen];
4238 char* buf_end = &buf[buflen - 1];
4239
4240 while (p < src_end && b < buf_end) {
4241 if (*p == '%') {
4242 switch (*(++p)) {
4243 case '%': // "%%" ==> "%"
4244 *b++ = *p++;
4245 break;
4246 case 'p': { // "%p" ==> current process id
4247 // buf_end points to the character before the last character so
4248 // that we could write '\0' to the end of the buffer.
4249 size_t buf_sz = buf_end - b + 1;
4250 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4251
4252 // if jio_snprintf fails or the buffer is not long enough to hold
4253 // the expanded pid, returns false.
4254 if (ret < 0 || ret >= (int)buf_sz) {
4255 return false;
4256 } else {
4257 b += ret;
4258 assert(*b == '\0', "fail in copy_expand_pid");
4259 if (p == src_end && b == buf_end + 1) {
4260 // reach the end of the buffer.
4261 return true;
4262 }
4263 }
4264 p++;
4265 break;
4266 }
4267 default :
4268 *b++ = '%';
4269 }
4270 } else {
4271 *b++ = *p++;
4272 }
4273 }
4274 *b = '\0';
4275 return (p == src_end); // return false if not all of the source was copied
4276 }