1 /*
2 * Copyright (c) 1997, 2016, 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 "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagRangeList.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/stringUtils.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciRuntime.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc/cms/compactibleFreeListSpace.hpp"
61 #include "gc/g1/g1CollectedHeap.inline.hpp"
62 #include "gc/parallel/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 #define UNSUPPORTED_GC_OPTION(gc) \
70 do { \
71 if (gc) { \
72 if (FLAG_IS_CMDLINE(gc)) { \
73 warning(#gc " is not supported in this VM. Using Serial GC."); \
74 } \
75 FLAG_SET_DEFAULT(gc, false); \
76 } \
77 } while(0)
78
79 char* Arguments::_jvm_flags_file = NULL;
80 char** Arguments::_jvm_flags_array = NULL;
81 int Arguments::_num_jvm_flags = 0;
82 char** Arguments::_jvm_args_array = NULL;
83 int Arguments::_num_jvm_args = 0;
84 char* Arguments::_java_command = NULL;
85 SystemProperty* Arguments::_system_properties = NULL;
86 bool Arguments::_has_profile = false;
87 size_t Arguments::_conservative_max_heap_alignment = 0;
88 size_t Arguments::_min_heap_size = 0;
89 Arguments::Mode Arguments::_mode = _mixed;
90 bool Arguments::_java_compiler = false;
91 bool Arguments::_xdebug_mode = false;
92 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 int Arguments::_sun_java_launcher_pid = -1;
95 bool Arguments::_sun_java_launcher_is_altjvm = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
103 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
104
105 char* Arguments::SharedArchivePath = NULL;
106
107 AgentLibraryList Arguments::_libraryList;
108 AgentLibraryList Arguments::_agentList;
109
110 abort_hook_t Arguments::_abort_hook = NULL;
111 exit_hook_t Arguments::_exit_hook = NULL;
112 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = NULL;
116 SystemProperty *Arguments::_java_library_path = NULL;
117 SystemProperty *Arguments::_java_home = NULL;
118 SystemProperty *Arguments::_java_class_path = NULL;
119 SystemProperty *Arguments::_sun_boot_class_path = NULL;
120
121 char* Arguments::_ext_dirs = NULL;
122
123 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
124 // part of the option string.
125 static bool match_option(const JavaVMOption *option, const char* name,
126 const char** tail) {
127 size_t len = strlen(name);
128 if (strncmp(option->optionString, name, len) == 0) {
129 *tail = option->optionString + len;
130 return true;
131 } else {
132 return false;
133 }
134 }
135
136 // Check if 'option' matches 'name'. No "tail" is allowed.
137 static bool match_option(const JavaVMOption *option, const char* name) {
138 const char* tail = NULL;
139 bool result = match_option(option, name, &tail);
140 if (tail != NULL && *tail == '\0') {
141 return result;
142 } else {
143 return false;
144 }
145 }
146
147 // Return true if any of the strings in null-terminated array 'names' matches.
148 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
149 // the option must match exactly.
150 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
151 bool tail_allowed) {
152 for (/* empty */; *names != NULL; ++names) {
153 if (match_option(option, *names, tail)) {
154 if (**tail == '\0' || tail_allowed && **tail == ':') {
155 return true;
156 }
157 }
158 }
159 return false;
160 }
161
162 static void logOption(const char* opt) {
163 if (PrintVMOptions) {
164 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
165 }
166 }
167
168 // Process java launcher properties.
169 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
170 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
171 // sun.java.launcher.pid is defined.
172 // Must do this before setting up other system properties,
173 // as some of them may depend on launcher type.
174 for (int index = 0; index < args->nOptions; index++) {
175 const JavaVMOption* option = args->options + index;
176 const char* tail;
177
178 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
179 process_java_launcher_argument(tail, option->extraInfo);
180 continue;
181 }
182 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
183 if (strcmp(tail, "true") == 0) {
184 _sun_java_launcher_is_altjvm = true;
185 }
186 continue;
187 }
188 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
189 _sun_java_launcher_pid = atoi(tail);
190 continue;
191 }
192 }
193 }
194
195 // Initialize system properties key and value.
196 void Arguments::init_system_properties() {
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
198 "Java Virtual Machine Specification", false));
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
202 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
203
204 // Following are JVMTI agent writable properties.
205 // Properties values are set to NULL and they are
206 // os specific they are initialized in os::init_system_properties_values().
207 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
208 _java_library_path = new SystemProperty("java.library.path", NULL, true);
209 _java_home = new SystemProperty("java.home", NULL, true);
210 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
211
212 _java_class_path = new SystemProperty("java.class.path", "", true);
213
214 // Add to System Property list.
215 PropertyList_add(&_system_properties, _sun_boot_library_path);
216 PropertyList_add(&_system_properties, _java_library_path);
217 PropertyList_add(&_system_properties, _java_home);
218 PropertyList_add(&_system_properties, _java_class_path);
219 PropertyList_add(&_system_properties, _sun_boot_class_path);
220
221 // Set OS specific system properties values
222 os::init_system_properties_values();
223
224 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
225 }
226
227 // Update/Initialize System properties after JDK version number is known
228 void Arguments::init_version_specific_system_properties() {
229 enum { bufsz = 16 };
230 char buffer[bufsz];
231 const char* spec_vendor = "Oracle Corporation";
232 uint32_t spec_version = JDK_Version::current().major_version();
233
234 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
235
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
238 PropertyList_add(&_system_properties,
239 new SystemProperty("java.vm.specification.version", buffer, false));
240 PropertyList_add(&_system_properties,
241 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
242 }
243
244 /*
245 * -XX argument processing:
246 *
247 * -XX arguments are defined in several places, such as:
248 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
249 * -XX arguments are parsed in parse_argument().
250 * -XX argument bounds checking is done in check_vm_args_consistency().
251 *
252 * Over time -XX arguments may change. There are mechanisms to handle common cases:
253 *
254 * ALIASED: An option that is simply another name for another option. This is often
255 * part of the process of deprecating a flag, but not all aliases need
256 * to be deprecated.
257 *
258 * Create an alias for an option by adding the old and new option names to the
259 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
260 *
261 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
262 * support may be removed in the future. Both regular and aliased options may be
263 * deprecated.
264 *
265 * Add a deprecation warning for an option (or alias) by adding an entry in the
266 * "special_jvm_flags" table and setting the "deprecated_in" field.
267 * Often an option "deprecated" in one major release will
268 * be made "obsolete" in the next. In this case the entry should also have it's
269 * "obsolete_in" field set.
270 *
271 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
272 * on the command line. A warning is printed to let the user know that option might not
273 * be accepted in the future.
274 *
275 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
276 * table and setting the "obsolete_in" field.
277 *
278 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
279 * to the current JDK version. The system will flatly refuse to admit the existence of
280 * the flag. This allows a flag to die automatically over JDK releases.
281 *
282 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
283 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
284 * - Newly obsolete or expired deprecated options should have their global variable
285 * definitions removed (from globals.hpp, etc) and related implementations removed.
286 *
287 * Recommended approach for removing options:
288 *
289 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
290 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
291 *
292 * To remove internal options (e.g. diagnostic, experimental, develop options), use
293 * a 2-step model adding major release numbers to the obsolete and expire columns.
294 *
295 * To change the name of an option, use the alias table as well as a 2-step
296 * model adding major release numbers to the deprecate and expire columns.
297 * Think twice about aliasing commonly used customer options.
298 *
299 * There are times when it is appropriate to leave a future release number as undefined.
300 *
301 * Tests: Aliases should be tested in VMAliasOptions.java.
302 * Deprecated options should be tested in VMDeprecatedOptions.java.
303 */
304
305 // Obsolete or deprecated -XX flag.
306 typedef struct {
307 const char* name;
308 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
309 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
310 JDK_Version expired_in; // When the option expires (or "undefined").
311 } SpecialFlag;
312
313 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
314 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
315 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
316 // the command-line as usual, but will issue a warning.
317 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
318 // the command-line, while issuing a warning and ignoring the flag value.
319 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
320 // existence of the flag.
321 //
322 // MANUAL CLEANUP ON JDK VERSION UPDATES:
323 // This table ensures that the handling of options will update automatically when the JDK
324 // version is incremented, but the source code needs to be cleanup up manually:
325 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
326 // variable should be removed, as well as users of the variable.
327 // - As "deprecated" options age into "obsolete" options, move the entry into the
328 // "Obsolete Flags" section of the table.
329 // - All expired options should be removed from the table.
330 static SpecialFlag const special_jvm_flags[] = {
331 // -------------- Deprecated Flags --------------
332 // --- Non-alias flags - sorted by obsolete_in then expired_in:
333 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
334 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
335
336 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
337 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
338 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
339 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344
345 // -------------- Obsolete Flags - sorted by expired_in --------------
346 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 #ifndef ZERO
360 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 #endif // ZERO
363 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372
373 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
374 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
375 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
376 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
377 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
378 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
381 #endif
382
383 { NULL, JDK_Version(0), JDK_Version(0) }
384 };
385
386 // Flags that are aliases for other flags.
387 typedef struct {
388 const char* alias_name;
389 const char* real_name;
390 } AliasedFlag;
391
392 static AliasedFlag const aliased_jvm_flags[] = {
393 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
394 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
395 { "CMSMarkStackSize", "MarkStackSize" },
396 { "G1MarkStackSize", "MarkStackSize" },
397 { "ParallelMarkingThreads", "ConcGCThreads" },
398 { "ParallelCMSThreads", "ConcGCThreads" },
399 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
400 { NULL, NULL}
401 };
402
403 static AliasedLoggingFlag const aliased_logging_flags[] = {
404 { "TraceClassLoading", LogLevel::Info, true, LogTag::_classload },
405 { "TraceClassUnloading", LogLevel::Info, true, LogTag::_classunload },
406 { "TraceClassResolution", LogLevel::Info, true, LogTag::_classresolve },
407 { "TraceExceptions", LogLevel::Info, true, LogTag::_exceptions },
408 { "TraceMonitorInflation", LogLevel::Debug, true, LogTag::_monitorinflation },
409 { NULL, LogLevel::Off, false, LogTag::__NO_TAG }
410 };
411
412 // Return true if "v" is less than "other", where "other" may be "undefined".
413 static bool version_less_than(JDK_Version v, JDK_Version other) {
414 assert(!v.is_undefined(), "must be defined");
415 if (!other.is_undefined() && v.compare(other) >= 0) {
416 return false;
417 } else {
418 return true;
419 }
420 }
421
422 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
423 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
424 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
425 flag = special_jvm_flags[i];
426 return true;
427 }
428 }
429 return false;
430 }
431
432 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
433 assert(version != NULL, "Must provide a version buffer");
434 SpecialFlag flag;
435 if (lookup_special_flag(flag_name, flag)) {
436 if (!flag.obsolete_in.is_undefined()) {
437 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
438 *version = flag.obsolete_in;
439 return true;
440 }
441 }
442 }
443 return false;
444 }
445
446 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
447 assert(version != NULL, "Must provide a version buffer");
448 SpecialFlag flag;
449 if (lookup_special_flag(flag_name, flag)) {
450 if (!flag.deprecated_in.is_undefined()) {
451 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
452 version_less_than(JDK_Version::current(), flag.expired_in)) {
453 *version = flag.deprecated_in;
454 return 1;
455 } else {
456 return -1;
457 }
458 }
459 }
460 return 0;
461 }
462
463 const char* Arguments::real_flag_name(const char *flag_name) {
464 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
465 const AliasedFlag& flag_status = aliased_jvm_flags[i];
466 if (strcmp(flag_status.alias_name, flag_name) == 0) {
467 return flag_status.real_name;
468 }
469 }
470 return flag_name;
471 }
472
473 #ifdef ASSERT
474 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
476 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
477 return true;
478 }
479 }
480 return false;
481 }
482
483 static bool verify_special_jvm_flags() {
484 bool success = true;
485 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
486 const SpecialFlag& flag = special_jvm_flags[i];
487 if (lookup_special_flag(flag.name, i)) {
488 warning("Duplicate special flag declaration \"%s\"", flag.name);
489 success = false;
490 }
491 if (flag.deprecated_in.is_undefined() &&
492 flag.obsolete_in.is_undefined()) {
493 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
494 success = false;
495 }
496
497 if (!flag.deprecated_in.is_undefined()) {
498 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
499 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
500 success = false;
501 }
502
503 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
504 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
505 success = false;
506 }
507 }
508
509 if (!flag.obsolete_in.is_undefined()) {
510 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
511 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
512 success = false;
513 }
514
515 // if flag has become obsolete it should not have a "globals" flag defined anymore.
516 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
517 if (Flag::find_flag(flag.name) != NULL) {
518 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
519 success = false;
520 }
521 }
522 }
523
524 if (!flag.expired_in.is_undefined()) {
525 // if flag has become expired it should not have a "globals" flag defined anymore.
526 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
527 if (Flag::find_flag(flag.name) != NULL) {
528 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
529 success = false;
530 }
531 }
532 }
533
534 }
535 return success;
536 }
537 #endif
538
539 // Constructs the system class path (aka boot class path) from the following
540 // components, in order:
541 //
542 // prefix // from -Xbootclasspath/p:...
543 // base // from os::get_system_properties() or -Xbootclasspath=
544 // suffix // from -Xbootclasspath/a:...
545 //
546 // This could be AllStatic, but it isn't needed after argument processing is
547 // complete.
548 class SysClassPath: public StackObj {
549 public:
550 SysClassPath(const char* base);
551 ~SysClassPath();
552
553 inline void set_base(const char* base);
554 inline void add_prefix(const char* prefix);
555 inline void add_suffix_to_prefix(const char* suffix);
556 inline void add_suffix(const char* suffix);
557 inline void reset_path(const char* base);
558
559 inline const char* get_base() const { return _items[_scp_base]; }
560 inline const char* get_prefix() const { return _items[_scp_prefix]; }
561 inline const char* get_suffix() const { return _items[_scp_suffix]; }
562
563 // Combine all the components into a single c-heap-allocated string; caller
564 // must free the string if/when no longer needed.
565 char* combined_path();
566
567 private:
568 // Utility routines.
569 static char* add_to_path(const char* path, const char* str, bool prepend);
570 static char* add_jars_to_path(char* path, const char* directory);
571
572 inline void reset_item_at(int index);
573
574 // Array indices for the items that make up the sysclasspath. All except the
575 // base are allocated in the C heap and freed by this class.
576 enum {
577 _scp_prefix, // from -Xbootclasspath/p:...
578 _scp_base, // the default sysclasspath
579 _scp_suffix, // from -Xbootclasspath/a:...
580 _scp_nitems // the number of items, must be last.
581 };
582
583 const char* _items[_scp_nitems];
584 };
585
586 SysClassPath::SysClassPath(const char* base) {
587 memset(_items, 0, sizeof(_items));
588 _items[_scp_base] = base;
589 }
590
591 SysClassPath::~SysClassPath() {
592 // Free everything except the base.
593 for (int i = 0; i < _scp_nitems; ++i) {
594 if (i != _scp_base) reset_item_at(i);
595 }
596 }
597
598 inline void SysClassPath::set_base(const char* base) {
599 _items[_scp_base] = base;
600 }
601
602 inline void SysClassPath::add_prefix(const char* prefix) {
603 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
604 }
605
606 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
607 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
608 }
609
610 inline void SysClassPath::add_suffix(const char* suffix) {
611 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
612 }
613
614 inline void SysClassPath::reset_item_at(int index) {
615 assert(index < _scp_nitems && index != _scp_base, "just checking");
616 if (_items[index] != NULL) {
617 FREE_C_HEAP_ARRAY(char, _items[index]);
618 _items[index] = NULL;
619 }
620 }
621
622 inline void SysClassPath::reset_path(const char* base) {
623 // Clear the prefix and suffix.
624 reset_item_at(_scp_prefix);
625 reset_item_at(_scp_suffix);
626 set_base(base);
627 }
628
629 //------------------------------------------------------------------------------
630
631
632 // Combine the bootclasspath elements, some of which may be null, into a single
633 // c-heap-allocated string.
634 char* SysClassPath::combined_path() {
635 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
636
637 size_t lengths[_scp_nitems];
638 size_t total_len = 0;
639
640 const char separator = *os::path_separator();
641
642 // Get the lengths.
643 int i;
644 for (i = 0; i < _scp_nitems; ++i) {
645 if (_items[i] != NULL) {
646 lengths[i] = strlen(_items[i]);
647 // Include space for the separator char (or a NULL for the last item).
648 total_len += lengths[i] + 1;
649 }
650 }
651 assert(total_len > 0, "empty sysclasspath not allowed");
652
653 // Copy the _items to a single string.
654 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
655 char* cp_tmp = cp;
656 for (i = 0; i < _scp_nitems; ++i) {
657 if (_items[i] != NULL) {
658 memcpy(cp_tmp, _items[i], lengths[i]);
659 cp_tmp += lengths[i];
660 *cp_tmp++ = separator;
661 }
662 }
663 *--cp_tmp = '\0'; // Replace the extra separator.
664 return cp;
665 }
666
667 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
668 char*
669 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
670 char *cp;
671
672 assert(str != NULL, "just checking");
673 if (path == NULL) {
674 size_t len = strlen(str) + 1;
675 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
676 memcpy(cp, str, len); // copy the trailing null
677 } else {
678 const char separator = *os::path_separator();
679 size_t old_len = strlen(path);
680 size_t str_len = strlen(str);
681 size_t len = old_len + str_len + 2;
682
683 if (prepend) {
684 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
685 char* cp_tmp = cp;
686 memcpy(cp_tmp, str, str_len);
687 cp_tmp += str_len;
688 *cp_tmp = separator;
689 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
690 FREE_C_HEAP_ARRAY(char, path);
691 } else {
692 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
693 char* cp_tmp = cp + old_len;
694 *cp_tmp = separator;
695 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
696 }
697 }
698 return cp;
699 }
700
701 // Scan the directory and append any jar or zip files found to path.
702 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
703 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
704 DIR* dir = os::opendir(directory);
705 if (dir == NULL) return path;
706
707 char dir_sep[2] = { '\0', '\0' };
708 size_t directory_len = strlen(directory);
709 const char fileSep = *os::file_separator();
710 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
711
712 /* Scan the directory for jars/zips, appending them to path. */
713 struct dirent *entry;
714 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
715 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
716 const char* name = entry->d_name;
717 const char* ext = name + strlen(name) - 4;
718 bool isJarOrZip = ext > name &&
719 (os::file_name_strcmp(ext, ".jar") == 0 ||
720 os::file_name_strcmp(ext, ".zip") == 0);
721 if (isJarOrZip) {
722 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
723 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
724 path = add_to_path(path, jarpath, false);
725 FREE_C_HEAP_ARRAY(char, jarpath);
726 }
727 }
728 FREE_C_HEAP_ARRAY(char, dbuf);
729 os::closedir(dir);
730 return path;
731 }
732
733 // Parses a memory size specification string.
734 static bool atomull(const char *s, julong* result) {
735 julong n = 0;
736 int args_read = 0;
737 bool is_hex = false;
738 // Skip leading 0[xX] for hexadecimal
739 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
740 s += 2;
741 is_hex = true;
742 args_read = sscanf(s, JULONG_FORMAT_X, &n);
743 } else {
744 args_read = sscanf(s, JULONG_FORMAT, &n);
745 }
746 if (args_read != 1) {
747 return false;
748 }
749 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
750 s++;
751 }
752 // 4705540: illegal if more characters are found after the first non-digit
753 if (strlen(s) > 1) {
754 return false;
755 }
756 switch (*s) {
757 case 'T': case 't':
758 *result = n * G * K;
759 // Check for overflow.
760 if (*result/((julong)G * K) != n) return false;
761 return true;
762 case 'G': case 'g':
763 *result = n * G;
764 if (*result/G != n) return false;
765 return true;
766 case 'M': case 'm':
767 *result = n * M;
768 if (*result/M != n) return false;
769 return true;
770 case 'K': case 'k':
771 *result = n * K;
772 if (*result/K != n) return false;
773 return true;
774 case '\0':
775 *result = n;
776 return true;
777 default:
778 return false;
779 }
780 }
781
782 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
783 if (size < min_size) return arg_too_small;
784 // Check that size will fit in a size_t (only relevant on 32-bit)
785 if (size > max_uintx) return arg_too_big;
786 return arg_in_range;
787 }
788
789 // Describe an argument out of range error
790 void Arguments::describe_range_error(ArgsRange errcode) {
791 switch(errcode) {
792 case arg_too_big:
793 jio_fprintf(defaultStream::error_stream(),
794 "The specified size exceeds the maximum "
795 "representable size.\n");
796 break;
797 case arg_too_small:
798 case arg_unreadable:
799 case arg_in_range:
800 // do nothing for now
801 break;
802 default:
803 ShouldNotReachHere();
804 }
805 }
806
807 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
808 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
809 return true;
810 } else {
811 return false;
812 }
813 }
814
815 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
816 char* end;
817 errno = 0;
818 double v = strtod(value, &end);
819 if ((errno != 0) || (*end != 0)) {
820 return false;
821 }
822
823 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
824 return true;
825 }
826 return false;
827 }
828
829 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
830 julong v;
831 int int_v;
832 intx intx_v;
833 bool is_neg = false;
834 Flag* result = Flag::find_flag(name, strlen(name));
835
836 if (result == NULL) {
837 return false;
838 }
839
840 // Check the sign first since atomull() parses only unsigned values.
841 if (*value == '-') {
842 if (!result->is_intx() && !result->is_int()) {
843 return false;
844 }
845 value++;
846 is_neg = true;
847 }
848 if (!atomull(value, &v)) {
849 return false;
850 }
851 if (result->is_int()) {
852 int_v = (int) v;
853 if (is_neg) {
854 int_v = -int_v;
855 }
856 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
857 } else if (result->is_uint()) {
858 uint uint_v = (uint) v;
859 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
860 } else if (result->is_intx()) {
861 intx_v = (intx) v;
862 if (is_neg) {
863 intx_v = -intx_v;
864 }
865 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
866 } else if (result->is_uintx()) {
867 uintx uintx_v = (uintx) v;
868 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
869 } else if (result->is_uint64_t()) {
870 uint64_t uint64_t_v = (uint64_t) v;
871 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
872 } else if (result->is_size_t()) {
873 size_t size_t_v = (size_t) v;
874 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
875 } else {
876 return false;
877 }
878 }
879
880 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
881 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
882 // Contract: CommandLineFlags always returns a pointer that needs freeing.
883 FREE_C_HEAP_ARRAY(char, value);
884 return true;
885 }
886
887 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
888 const char* old_value = "";
889 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
890 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
891 size_t new_len = strlen(new_value);
892 const char* value;
893 char* free_this_too = NULL;
894 if (old_len == 0) {
895 value = new_value;
896 } else if (new_len == 0) {
897 value = old_value;
898 } else {
899 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
900 // each new setting adds another LINE to the switch:
901 sprintf(buf, "%s\n%s", old_value, new_value);
902 value = buf;
903 free_this_too = buf;
904 }
905 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
906 // CommandLineFlags always returns a pointer that needs freeing.
907 FREE_C_HEAP_ARRAY(char, value);
908 if (free_this_too != NULL) {
909 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
910 FREE_C_HEAP_ARRAY(char, free_this_too);
911 }
912 return true;
913 }
914
915 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
916 const char* real_name = real_flag_name(arg);
917 JDK_Version since = JDK_Version();
918 switch (is_deprecated_flag(arg, &since)) {
919 case -1:
920 return NULL; // obsolete or expired, don't process normally
921 case 0:
922 return real_name;
923 case 1: {
924 if (warn) {
925 char version[256];
926 since.to_string(version, sizeof(version));
927 if (real_name != arg) {
928 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
929 arg, version, real_name);
930 } else {
931 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
932 arg, version);
933 }
934 }
935 return real_name;
936 }
937 }
938 ShouldNotReachHere();
939 return NULL;
940 }
941
942 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name){
943 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
944 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
945 if (strcmp(alf.alias_name, name) == 0) {
946 return alf;
947 }
948 }
949 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LogTag::__NO_TAG};
950 return a;
951 }
952
953 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
954
955 // range of acceptable characters spelled out for portability reasons
956 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
957 #define BUFLEN 255
958 char name[BUFLEN+1];
959 char dummy;
960 const char* real_name;
961 bool warn_if_deprecated = true;
962 AliasedLoggingFlag alf;
963
964 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
965 alf = catch_logging_aliases(name);
966 if (alf.alias_name != NULL){
967 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
968 return true;
969 }
970 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
971 if (real_name == NULL) {
972 return false;
973 }
974 return set_bool_flag(real_name, false, origin);
975 }
976 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
977 alf = catch_logging_aliases(name);
978 if (alf.alias_name != NULL){
979 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
980 return true;
981 }
982 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
983 if (real_name == NULL) {
984 return false;
985 }
986 return set_bool_flag(real_name, true, origin);
987 }
988
989 char punct;
990 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
991 const char* value = strchr(arg, '=') + 1;
992 Flag* flag;
993
994 // this scanf pattern matches both strings (handled here) and numbers (handled later))
995 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
996 if (real_name == NULL) {
997 return false;
998 }
999 flag = Flag::find_flag(real_name);
1000 if (flag != NULL && flag->is_ccstr()) {
1001 if (flag->ccstr_accumulates()) {
1002 return append_to_string_flag(real_name, value, origin);
1003 } else {
1004 if (value[0] == '\0') {
1005 value = NULL;
1006 }
1007 return set_string_flag(real_name, value, origin);
1008 }
1009 } else {
1010 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1011 }
1012 }
1013
1014 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1015 const char* value = strchr(arg, '=') + 1;
1016 // -XX:Foo:=xxx will reset the string flag to the given value.
1017 if (value[0] == '\0') {
1018 value = NULL;
1019 }
1020 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1021 if (real_name == NULL) {
1022 return false;
1023 }
1024 return set_string_flag(real_name, value, origin);
1025 }
1026
1027 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1028 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1029 #define NUMBER_RANGE "[0123456789eE+-]"
1030 char value[BUFLEN + 1];
1031 char value2[BUFLEN + 1];
1032 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1033 // Looks like a floating-point number -- try again with more lenient format string
1034 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1035 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1036 if (real_name == NULL) {
1037 return false;
1038 }
1039 return set_fp_numeric_flag(real_name, value, origin);
1040 }
1041 }
1042
1043 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1044 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1045 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1046 if (real_name == NULL) {
1047 return false;
1048 }
1049 return set_numeric_flag(real_name, value, origin);
1050 }
1051
1052 return false;
1053 }
1054
1055 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1056 assert(bldarray != NULL, "illegal argument");
1057
1058 if (arg == NULL) {
1059 return;
1060 }
1061
1062 int new_count = *count + 1;
1063
1064 // expand the array and add arg to the last element
1065 if (*bldarray == NULL) {
1066 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1067 } else {
1068 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1069 }
1070 (*bldarray)[*count] = os::strdup_check_oom(arg);
1071 *count = new_count;
1072 }
1073
1074 void Arguments::build_jvm_args(const char* arg) {
1075 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1076 }
1077
1078 void Arguments::build_jvm_flags(const char* arg) {
1079 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1080 }
1081
1082 // utility function to return a string that concatenates all
1083 // strings in a given char** array
1084 const char* Arguments::build_resource_string(char** args, int count) {
1085 if (args == NULL || count == 0) {
1086 return NULL;
1087 }
1088 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1089 for (int i = 1; i < count; i++) {
1090 length += strlen(args[i]) + 1; // add 1 for a space
1091 }
1092 char* s = NEW_RESOURCE_ARRAY(char, length);
1093 strcpy(s, args[0]);
1094 for (int j = 1; j < count; j++) {
1095 strcat(s, " ");
1096 strcat(s, args[j]);
1097 }
1098 return (const char*) s;
1099 }
1100
1101 void Arguments::print_on(outputStream* st) {
1102 st->print_cr("VM Arguments:");
1103 if (num_jvm_flags() > 0) {
1104 st->print("jvm_flags: "); print_jvm_flags_on(st);
1105 st->cr();
1106 }
1107 if (num_jvm_args() > 0) {
1108 st->print("jvm_args: "); print_jvm_args_on(st);
1109 st->cr();
1110 }
1111 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1112 if (_java_class_path != NULL) {
1113 char* path = _java_class_path->value();
1114 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1115 }
1116 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1117 }
1118
1119 void Arguments::print_summary_on(outputStream* st) {
1120 // Print the command line. Environment variables that are helpful for
1121 // reproducing the problem are written later in the hs_err file.
1122 // flags are from setting file
1123 if (num_jvm_flags() > 0) {
1124 st->print_raw("Settings File: ");
1125 print_jvm_flags_on(st);
1126 st->cr();
1127 }
1128 // args are the command line and environment variable arguments.
1129 st->print_raw("Command Line: ");
1130 if (num_jvm_args() > 0) {
1131 print_jvm_args_on(st);
1132 }
1133 // this is the classfile and any arguments to the java program
1134 if (java_command() != NULL) {
1135 st->print("%s", java_command());
1136 }
1137 st->cr();
1138 }
1139
1140 void Arguments::print_jvm_flags_on(outputStream* st) {
1141 if (_num_jvm_flags > 0) {
1142 for (int i=0; i < _num_jvm_flags; i++) {
1143 st->print("%s ", _jvm_flags_array[i]);
1144 }
1145 }
1146 }
1147
1148 void Arguments::print_jvm_args_on(outputStream* st) {
1149 if (_num_jvm_args > 0) {
1150 for (int i=0; i < _num_jvm_args; i++) {
1151 st->print("%s ", _jvm_args_array[i]);
1152 }
1153 }
1154 }
1155
1156 bool Arguments::process_argument(const char* arg,
1157 jboolean ignore_unrecognized,
1158 Flag::Flags origin) {
1159 JDK_Version since = JDK_Version();
1160
1161 if (parse_argument(arg, origin)) {
1162 return true;
1163 }
1164
1165 // Determine if the flag has '+', '-', or '=' characters.
1166 bool has_plus_minus = (*arg == '+' || *arg == '-');
1167 const char* const argname = has_plus_minus ? arg + 1 : arg;
1168
1169 size_t arg_len;
1170 const char* equal_sign = strchr(argname, '=');
1171 if (equal_sign == NULL) {
1172 arg_len = strlen(argname);
1173 } else {
1174 arg_len = equal_sign - argname;
1175 }
1176
1177 // Only make the obsolete check for valid arguments.
1178 if (arg_len <= BUFLEN) {
1179 // Construct a string which consists only of the argument name without '+', '-', or '='.
1180 char stripped_argname[BUFLEN+1];
1181 strncpy(stripped_argname, argname, arg_len);
1182 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1183
1184 if (is_obsolete_flag(stripped_argname, &since)) {
1185 char version[256];
1186 since.to_string(version, sizeof(version));
1187 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1188 return true;
1189 }
1190 }
1191
1192 // For locked flags, report a custom error message if available.
1193 // Otherwise, report the standard unrecognized VM option.
1194 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1195 if (found_flag != NULL) {
1196 char locked_message_buf[BUFLEN];
1197 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1198 if (strlen(locked_message_buf) == 0) {
1199 if (found_flag->is_bool() && !has_plus_minus) {
1200 jio_fprintf(defaultStream::error_stream(),
1201 "Missing +/- setting for VM option '%s'\n", argname);
1202 } else if (!found_flag->is_bool() && has_plus_minus) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Unexpected +/- setting in VM option '%s'\n", argname);
1205 } else {
1206 jio_fprintf(defaultStream::error_stream(),
1207 "Improperly specified VM option '%s'\n", argname);
1208 }
1209 } else {
1210 #ifdef PRODUCT
1211 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1212 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1213 if (ignore_unrecognized && mismatched) {
1214 return true;
1215 }
1216 #endif
1217 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1218 }
1219 } else {
1220 if (ignore_unrecognized) {
1221 return true;
1222 }
1223 jio_fprintf(defaultStream::error_stream(),
1224 "Unrecognized VM option '%s'\n", argname);
1225 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1226 if (fuzzy_matched != NULL) {
1227 jio_fprintf(defaultStream::error_stream(),
1228 "Did you mean '%s%s%s'? ",
1229 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1230 fuzzy_matched->_name,
1231 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1232 }
1233 }
1234
1235 // allow for commandline "commenting out" options like -XX:#+Verbose
1236 return arg[0] == '#';
1237 }
1238
1239 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1240 FILE* stream = fopen(file_name, "rb");
1241 if (stream == NULL) {
1242 if (should_exist) {
1243 jio_fprintf(defaultStream::error_stream(),
1244 "Could not open settings file %s\n", file_name);
1245 return false;
1246 } else {
1247 return true;
1248 }
1249 }
1250
1251 char token[1024];
1252 int pos = 0;
1253
1254 bool in_white_space = true;
1255 bool in_comment = false;
1256 bool in_quote = false;
1257 char quote_c = 0;
1258 bool result = true;
1259
1260 int c = getc(stream);
1261 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1262 if (in_white_space) {
1263 if (in_comment) {
1264 if (c == '\n') in_comment = false;
1265 } else {
1266 if (c == '#') in_comment = true;
1267 else if (!isspace(c)) {
1268 in_white_space = false;
1269 token[pos++] = c;
1270 }
1271 }
1272 } else {
1273 if (c == '\n' || (!in_quote && isspace(c))) {
1274 // token ends at newline, or at unquoted whitespace
1275 // this allows a way to include spaces in string-valued options
1276 token[pos] = '\0';
1277 logOption(token);
1278 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1279 build_jvm_flags(token);
1280 pos = 0;
1281 in_white_space = true;
1282 in_quote = false;
1283 } else if (!in_quote && (c == '\'' || c == '"')) {
1284 in_quote = true;
1285 quote_c = c;
1286 } else if (in_quote && (c == quote_c)) {
1287 in_quote = false;
1288 } else {
1289 token[pos++] = c;
1290 }
1291 }
1292 c = getc(stream);
1293 }
1294 if (pos > 0) {
1295 token[pos] = '\0';
1296 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1297 build_jvm_flags(token);
1298 }
1299 fclose(stream);
1300 return result;
1301 }
1302
1303 //=============================================================================================================
1304 // Parsing of properties (-D)
1305
1306 const char* Arguments::get_property(const char* key) {
1307 return PropertyList_get_value(system_properties(), key);
1308 }
1309
1310 bool Arguments::add_property(const char* prop) {
1311 const char* eq = strchr(prop, '=');
1312 const char* key;
1313 const char* value = "";
1314
1315 if (eq == NULL) {
1316 // property doesn't have a value, thus use passed string
1317 key = prop;
1318 } else {
1319 // property have a value, thus extract it and save to the
1320 // allocated string
1321 size_t key_len = eq - prop;
1322 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1323
1324 strncpy(tmp_key, prop, key_len);
1325 tmp_key[key_len] = '\0';
1326 key = tmp_key;
1327
1328 value = &prop[key_len + 1];
1329 }
1330
1331 if (strcmp(key, "java.compiler") == 0) {
1332 process_java_compiler_argument(value);
1333 // Record value in Arguments, but let it get passed to Java.
1334 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1335 strcmp(key, "sun.java.launcher.pid") == 0) {
1336 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1337 // private and are processed in process_sun_java_launcher_properties();
1338 // the sun.java.launcher property is passed on to the java application
1339 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1340 PropertyList_unique_add(&_system_properties, key, value, true);
1341 } else {
1342 if (strcmp(key, "sun.java.command") == 0) {
1343 char *old_java_command = _java_command;
1344 _java_command = os::strdup_check_oom(value, mtInternal);
1345 if (old_java_command != NULL) {
1346 os::free(old_java_command);
1347 }
1348 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1349 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1350 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1351 // its value without going through the property list or making a Java call.
1352 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1353 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1354 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1355 os::free((void *)old_java_vendor_url_bug);
1356 }
1357 }
1358
1359 // Create new property and add at the end of the list
1360 PropertyList_unique_add(&_system_properties, key, value);
1361 }
1362
1363 if (key != prop) {
1364 // SystemProperty copy passed value, thus free previously allocated
1365 // memory
1366 FreeHeap((void *)key);
1367 }
1368
1369 return true;
1370 }
1371
1372 //===========================================================================================================
1373 // Setting int/mixed/comp mode flags
1374
1375 void Arguments::set_mode_flags(Mode mode) {
1376 // Set up default values for all flags.
1377 // If you add a flag to any of the branches below,
1378 // add a default value for it here.
1379 set_java_compiler(false);
1380 _mode = mode;
1381
1382 // Ensure Agent_OnLoad has the correct initial values.
1383 // This may not be the final mode; mode may change later in onload phase.
1384 PropertyList_unique_add(&_system_properties, "java.vm.info",
1385 VM_Version::vm_info_string(), false);
1386
1387 UseInterpreter = true;
1388 UseCompiler = true;
1389 UseLoopCounter = true;
1390
1391 // Default values may be platform/compiler dependent -
1392 // use the saved values
1393 ClipInlining = Arguments::_ClipInlining;
1394 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1395 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1396 BackgroundCompilation = Arguments::_BackgroundCompilation;
1397 if (TieredCompilation) {
1398 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1399 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1400 }
1401 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1402 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1403 }
1404 }
1405
1406 // Change from defaults based on mode
1407 switch (mode) {
1408 default:
1409 ShouldNotReachHere();
1410 break;
1411 case _int:
1412 UseCompiler = false;
1413 UseLoopCounter = false;
1414 AlwaysCompileLoopMethods = false;
1415 UseOnStackReplacement = false;
1416 break;
1417 case _mixed:
1418 // same as default
1419 break;
1420 case _comp:
1421 UseInterpreter = false;
1422 BackgroundCompilation = false;
1423 ClipInlining = false;
1424 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1425 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1426 // compile a level 4 (C2) and then continue executing it.
1427 if (TieredCompilation) {
1428 Tier3InvokeNotifyFreqLog = 0;
1429 Tier4InvocationThreshold = 0;
1430 }
1431 break;
1432 }
1433 }
1434
1435 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1436 // Conflict: required to use shared spaces (-Xshare:on), but
1437 // incompatible command line options were chosen.
1438
1439 static void no_shared_spaces(const char* message) {
1440 if (RequireSharedSpaces) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "Class data sharing is inconsistent with other specified options.\n");
1443 vm_exit_during_initialization("Unable to use shared archive.", message);
1444 } else {
1445 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1446 }
1447 }
1448 #endif
1449
1450 // Returns threshold scaled with the value of scale.
1451 // If scale < 0.0, threshold is returned without scaling.
1452 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1453 if (scale == 1.0 || scale < 0.0) {
1454 return threshold;
1455 } else {
1456 return (intx)(threshold * scale);
1457 }
1458 }
1459
1460 // Returns freq_log scaled with the value of scale.
1461 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1462 // If scale < 0.0, freq_log is returned without scaling.
1463 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1464 // Check if scaling is necessary or if negative value was specified.
1465 if (scale == 1.0 || scale < 0.0) {
1466 return freq_log;
1467 }
1468 // Check values to avoid calculating log2 of 0.
1469 if (scale == 0.0 || freq_log == 0) {
1470 return 0;
1471 }
1472 // Determine the maximum notification frequency value currently supported.
1473 // The largest mask value that the interpreter/C1 can handle is
1474 // of length InvocationCounter::number_of_count_bits. Mask values are always
1475 // one bit shorter then the value of the notification frequency. Set
1476 // max_freq_bits accordingly.
1477 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1478 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1479 if (scaled_freq == 0) {
1480 // Return 0 right away to avoid calculating log2 of 0.
1481 return 0;
1482 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1483 return max_freq_bits;
1484 } else {
1485 return log2_intptr(scaled_freq);
1486 }
1487 }
1488
1489 void Arguments::set_tiered_flags() {
1490 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1491 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1492 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1493 }
1494 if (CompilationPolicyChoice < 2) {
1495 vm_exit_during_initialization(
1496 "Incompatible compilation policy selected", NULL);
1497 }
1498 // Increase the code cache size - tiered compiles a lot more.
1499 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1500 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1501 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1502 }
1503 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1504 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1505 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1506 }
1507 if (!UseInterpreter) { // -Xcomp
1508 Tier3InvokeNotifyFreqLog = 0;
1509 Tier4InvocationThreshold = 0;
1510 }
1511
1512 if (CompileThresholdScaling < 0) {
1513 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1514 }
1515
1516 // Scale tiered compilation thresholds.
1517 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1518 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1519 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1520 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1521
1522 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1523 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1524 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1525 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1526
1527 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1528 // once these thresholds become supported.
1529
1530 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1531 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1532
1533 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1534 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1535
1536 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1537
1538 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1539 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1540 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1541 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1542 }
1543 }
1544
1545 #if INCLUDE_ALL_GCS
1546 static void disable_adaptive_size_policy(const char* collector_name) {
1547 if (UseAdaptiveSizePolicy) {
1548 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1549 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1550 collector_name);
1551 }
1552 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1553 }
1554 }
1555
1556 void Arguments::set_parnew_gc_flags() {
1557 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1558 "control point invariant");
1559 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1560 assert(UseParNewGC, "ParNew should always be used with CMS");
1561
1562 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1563 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1564 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1565 } else if (ParallelGCThreads == 0) {
1566 jio_fprintf(defaultStream::error_stream(),
1567 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1568 vm_exit(1);
1569 }
1570
1571 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1572 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1573 // we set them to 1024 and 1024.
1574 // See CR 6362902.
1575 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1576 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1577 }
1578 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1579 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1580 }
1581
1582 // When using compressed oops, we use local overflow stacks,
1583 // rather than using a global overflow list chained through
1584 // the klass word of the object's pre-image.
1585 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1586 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1587 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1588 }
1589 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1590 }
1591 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1592 }
1593
1594 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1595 // sparc/solaris for certain applications, but would gain from
1596 // further optimization and tuning efforts, and would almost
1597 // certainly gain from analysis of platform and environment.
1598 void Arguments::set_cms_and_parnew_gc_flags() {
1599 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1600 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1601 assert(UseParNewGC, "ParNew should always be used with CMS");
1602
1603 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1604 disable_adaptive_size_policy("UseConcMarkSweepGC");
1605
1606 set_parnew_gc_flags();
1607
1608 size_t max_heap = align_size_down(MaxHeapSize,
1609 CardTableRS::ct_max_alignment_constraint());
1610
1611 // Now make adjustments for CMS
1612 intx tenuring_default = (intx)6;
1613 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1614
1615 // Preferred young gen size for "short" pauses:
1616 // upper bound depends on # of threads and NewRatio.
1617 const size_t preferred_max_new_size_unaligned =
1618 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1619 size_t preferred_max_new_size =
1620 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1621
1622 // Unless explicitly requested otherwise, size young gen
1623 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1624
1625 // If either MaxNewSize or NewRatio is set on the command line,
1626 // assume the user is trying to set the size of the young gen.
1627 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1628
1629 // Set MaxNewSize to our calculated preferred_max_new_size unless
1630 // NewSize was set on the command line and it is larger than
1631 // preferred_max_new_size.
1632 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1633 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1634 } else {
1635 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1636 }
1637 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1638
1639 // Code along this path potentially sets NewSize and OldSize
1640 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1641 min_heap_size(), InitialHeapSize, max_heap);
1642 size_t min_new = preferred_max_new_size;
1643 if (FLAG_IS_CMDLINE(NewSize)) {
1644 min_new = NewSize;
1645 }
1646 if (max_heap > min_new && min_heap_size() > min_new) {
1647 // Unless explicitly requested otherwise, make young gen
1648 // at least min_new, and at most preferred_max_new_size.
1649 if (FLAG_IS_DEFAULT(NewSize)) {
1650 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1651 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1652 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1653 }
1654 // Unless explicitly requested otherwise, size old gen
1655 // so it's NewRatio x of NewSize.
1656 if (FLAG_IS_DEFAULT(OldSize)) {
1657 if (max_heap > NewSize) {
1658 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1659 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1660 }
1661 }
1662 }
1663 }
1664 // Unless explicitly requested otherwise, definitely
1665 // promote all objects surviving "tenuring_default" scavenges.
1666 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1667 FLAG_IS_DEFAULT(SurvivorRatio)) {
1668 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1669 }
1670 // If we decided above (or user explicitly requested)
1671 // `promote all' (via MaxTenuringThreshold := 0),
1672 // prefer minuscule survivor spaces so as not to waste
1673 // space for (non-existent) survivors
1674 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1675 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1676 }
1677
1678 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1679 // but rather the number of free blocks of a given size that are used when
1680 // replenishing the local per-worker free list caches.
1681 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1682 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1683 // OldPLAB sizing manually turned off: Use a larger default setting,
1684 // unless it was manually specified. This is because a too-low value
1685 // will slow down scavenges.
1686 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1687 } else {
1688 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1689 }
1690 }
1691
1692 // If either of the static initialization defaults have changed, note this
1693 // modification.
1694 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1695 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1696 }
1697
1698 if (!ClassUnloading) {
1699 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1700 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1701 }
1702
1703 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1704 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1705 }
1706 #endif // INCLUDE_ALL_GCS
1707
1708 void set_object_alignment() {
1709 // Object alignment.
1710 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1711 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1712 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1713 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1714 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1715 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1716
1717 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1718 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1719
1720 // Oop encoding heap max
1721 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1722
1723 if (SurvivorAlignmentInBytes == 0) {
1724 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1725 }
1726
1727 #if INCLUDE_ALL_GCS
1728 // Set CMS global values
1729 CompactibleFreeListSpace::set_cms_values();
1730 #endif // INCLUDE_ALL_GCS
1731 }
1732
1733 size_t Arguments::max_heap_for_compressed_oops() {
1734 // Avoid sign flip.
1735 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1736 // We need to fit both the NULL page and the heap into the memory budget, while
1737 // keeping alignment constraints of the heap. To guarantee the latter, as the
1738 // NULL page is located before the heap, we pad the NULL page to the conservative
1739 // maximum alignment that the GC may ever impose upon the heap.
1740 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1741 _conservative_max_heap_alignment);
1742
1743 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1744 NOT_LP64(ShouldNotReachHere(); return 0);
1745 }
1746
1747 bool Arguments::should_auto_select_low_pause_collector() {
1748 if (UseAutoGCSelectPolicy &&
1749 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1750 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1751 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1752 return true;
1753 }
1754 return false;
1755 }
1756
1757 void Arguments::set_use_compressed_oops() {
1758 #ifndef ZERO
1759 #ifdef _LP64
1760 // MaxHeapSize is not set up properly at this point, but
1761 // the only value that can override MaxHeapSize if we are
1762 // to use UseCompressedOops is InitialHeapSize.
1763 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1764
1765 if (max_heap_size <= max_heap_for_compressed_oops()) {
1766 #if !defined(COMPILER1) || defined(TIERED)
1767 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1768 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1769 }
1770 #endif
1771 } else {
1772 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1773 warning("Max heap size too large for Compressed Oops");
1774 FLAG_SET_DEFAULT(UseCompressedOops, false);
1775 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1776 }
1777 }
1778 #endif // _LP64
1779 #endif // ZERO
1780 }
1781
1782
1783 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1784 // set_use_compressed_oops().
1785 void Arguments::set_use_compressed_klass_ptrs() {
1786 #ifndef ZERO
1787 #ifdef _LP64
1788 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1789 if (!UseCompressedOops) {
1790 if (UseCompressedClassPointers) {
1791 warning("UseCompressedClassPointers requires UseCompressedOops");
1792 }
1793 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1794 } else {
1795 // Turn on UseCompressedClassPointers too
1796 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1797 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1798 }
1799 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1800 if (UseCompressedClassPointers) {
1801 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1802 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1803 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1804 }
1805 }
1806 }
1807 #endif // _LP64
1808 #endif // !ZERO
1809 }
1810
1811 void Arguments::set_conservative_max_heap_alignment() {
1812 // The conservative maximum required alignment for the heap is the maximum of
1813 // the alignments imposed by several sources: any requirements from the heap
1814 // itself, the collector policy and the maximum page size we may run the VM
1815 // with.
1816 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1817 #if INCLUDE_ALL_GCS
1818 if (UseParallelGC) {
1819 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1820 } else if (UseG1GC) {
1821 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1822 }
1823 #endif // INCLUDE_ALL_GCS
1824 _conservative_max_heap_alignment = MAX4(heap_alignment,
1825 (size_t)os::vm_allocation_granularity(),
1826 os::max_page_size(),
1827 CollectorPolicy::compute_heap_alignment());
1828 }
1829
1830 void Arguments::select_gc_ergonomically() {
1831 if (os::is_server_class_machine()) {
1832 if (should_auto_select_low_pause_collector()) {
1833 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1834 } else {
1835 #if defined(JAVASE_EMBEDDED)
1836 FLAG_SET_ERGO(bool, UseParallelGC, true);
1837 #else
1838 FLAG_SET_ERGO(bool, UseG1GC, true);
1839 #endif
1840 }
1841 } else {
1842 FLAG_SET_ERGO(bool, UseSerialGC, true);
1843 }
1844 }
1845
1846 void Arguments::select_gc() {
1847 if (!gc_selected()) {
1848 select_gc_ergonomically();
1849 guarantee(gc_selected(), "No GC selected");
1850 }
1851 }
1852
1853 void Arguments::set_ergonomics_flags() {
1854 select_gc();
1855
1856 #if defined(COMPILER2) || INCLUDE_JVMCI
1857 // Shared spaces work fine with other GCs but causes bytecode rewriting
1858 // to be disabled, which hurts interpreter performance and decreases
1859 // server performance. When -server is specified, keep the default off
1860 // unless it is asked for. Future work: either add bytecode rewriting
1861 // at link time, or rewrite bytecodes in non-shared methods.
1862 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1863 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1864 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1865 }
1866 #endif
1867
1868 set_conservative_max_heap_alignment();
1869
1870 #ifndef ZERO
1871 #ifdef _LP64
1872 set_use_compressed_oops();
1873
1874 // set_use_compressed_klass_ptrs() must be called after calling
1875 // set_use_compressed_oops().
1876 set_use_compressed_klass_ptrs();
1877
1878 // Also checks that certain machines are slower with compressed oops
1879 // in vm_version initialization code.
1880 #endif // _LP64
1881 #endif // !ZERO
1882
1883 CodeCacheExtensions::set_ergonomics_flags();
1884 }
1885
1886 void Arguments::set_parallel_gc_flags() {
1887 assert(UseParallelGC || UseParallelOldGC, "Error");
1888 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1889 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1890 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1891 }
1892 FLAG_SET_DEFAULT(UseParallelGC, true);
1893
1894 // If no heap maximum was requested explicitly, use some reasonable fraction
1895 // of the physical memory, up to a maximum of 1GB.
1896 FLAG_SET_DEFAULT(ParallelGCThreads,
1897 Abstract_VM_Version::parallel_worker_threads());
1898 if (ParallelGCThreads == 0) {
1899 jio_fprintf(defaultStream::error_stream(),
1900 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1901 vm_exit(1);
1902 }
1903
1904 if (UseAdaptiveSizePolicy) {
1905 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1906 // unless the user actually sets these flags.
1907 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1908 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1909 }
1910 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1911 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1912 }
1913 }
1914
1915 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1916 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1917 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1918 // See CR 6362902 for details.
1919 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1920 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1921 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1922 }
1923 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1924 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1925 }
1926 }
1927
1928 if (UseParallelOldGC) {
1929 // Par compact uses lower default values since they are treated as
1930 // minimums. These are different defaults because of the different
1931 // interpretation and are not ergonomically set.
1932 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1933 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1934 }
1935 }
1936 }
1937
1938 void Arguments::set_g1_gc_flags() {
1939 assert(UseG1GC, "Error");
1940 #if defined(COMPILER1) || INCLUDE_JVMCI
1941 FastTLABRefill = false;
1942 #endif
1943 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1944 if (ParallelGCThreads == 0) {
1945 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1946 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1947 }
1948
1949 #if INCLUDE_ALL_GCS
1950 if (G1ConcRefinementThreads == 0) {
1951 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1952 }
1953 #endif
1954
1955 // MarkStackSize will be set (if it hasn't been set by the user)
1956 // when concurrent marking is initialized.
1957 // Its value will be based upon the number of parallel marking threads.
1958 // But we do set the maximum mark stack size here.
1959 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1960 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1961 }
1962
1963 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1964 // In G1, we want the default GC overhead goal to be higher than
1965 // it is for PS, or the heap might be expanded too aggressively.
1966 // We set it here to ~8%.
1967 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1968 }
1969
1970 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1971 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1972 }
1973
1974 #if !INCLUDE_ALL_GCS
1975 #ifdef ASSERT
1976 static bool verify_serial_gc_flags() {
1977 return (UseSerialGC &&
1978 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1979 UseParallelGC || UseParallelOldGC));
1980 }
1981 #endif // ASSERT
1982 #endif // INCLUDE_ALL_GCS
1983
1984 void Arguments::set_gc_specific_flags() {
1985 #if INCLUDE_ALL_GCS
1986 // Set per-collector flags
1987 if (UseParallelGC || UseParallelOldGC) {
1988 set_parallel_gc_flags();
1989 } else if (UseConcMarkSweepGC) {
1990 set_cms_and_parnew_gc_flags();
1991 } else if (UseG1GC) {
1992 set_g1_gc_flags();
1993 }
1994 if (AssumeMP && !UseSerialGC) {
1995 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1996 warning("If the number of processors is expected to increase from one, then"
1997 " you should configure the number of parallel GC threads appropriately"
1998 " using -XX:ParallelGCThreads=N");
1999 }
2000 }
2001 if (MinHeapFreeRatio == 100) {
2002 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2003 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2004 }
2005 #else // INCLUDE_ALL_GCS
2006 assert(verify_serial_gc_flags(), "SerialGC unset");
2007 #endif // INCLUDE_ALL_GCS
2008 }
2009
2010 julong Arguments::limit_by_allocatable_memory(julong limit) {
2011 julong max_allocatable;
2012 julong result = limit;
2013 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2014 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2015 }
2016 return result;
2017 }
2018
2019 // Use static initialization to get the default before parsing
2020 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2021
2022 void Arguments::set_heap_size() {
2023 const julong phys_mem =
2024 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2025 : (julong)MaxRAM;
2026
2027 // If the maximum heap size has not been set with -Xmx,
2028 // then set it as fraction of the size of physical memory,
2029 // respecting the maximum and minimum sizes of the heap.
2030 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2031 julong reasonable_max = phys_mem / MaxRAMFraction;
2032
2033 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2034 // Small physical memory, so use a minimum fraction of it for the heap
2035 reasonable_max = phys_mem / MinRAMFraction;
2036 } else {
2037 // Not-small physical memory, so require a heap at least
2038 // as large as MaxHeapSize
2039 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2040 }
2041 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2042 // Limit the heap size to ErgoHeapSizeLimit
2043 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2044 }
2045 if (UseCompressedOops) {
2046 // Limit the heap size to the maximum possible when using compressed oops
2047 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2048
2049 // HeapBaseMinAddress can be greater than default but not less than.
2050 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2051 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2052 // matches compressed oops printing flags
2053 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2054 jio_fprintf(defaultStream::error_stream(),
2055 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2056 " (" SIZE_FORMAT "G) which is greater than value given "
2057 SIZE_FORMAT "\n",
2058 DefaultHeapBaseMinAddress,
2059 DefaultHeapBaseMinAddress/G,
2060 HeapBaseMinAddress);
2061 }
2062 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2063 }
2064 }
2065
2066 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2067 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2068 // but it should be not less than default MaxHeapSize.
2069 max_coop_heap -= HeapBaseMinAddress;
2070 }
2071 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2072 }
2073 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2074
2075 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2076 // An initial heap size was specified on the command line,
2077 // so be sure that the maximum size is consistent. Done
2078 // after call to limit_by_allocatable_memory because that
2079 // method might reduce the allocation size.
2080 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2081 }
2082
2083 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2084 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2085 }
2086
2087 // If the minimum or initial heap_size have not been set or requested to be set
2088 // ergonomically, set them accordingly.
2089 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2090 julong reasonable_minimum = (julong)(OldSize + NewSize);
2091
2092 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2093
2094 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2095
2096 if (InitialHeapSize == 0) {
2097 julong reasonable_initial = phys_mem / InitialRAMFraction;
2098
2099 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2100 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2101
2102 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2103
2104 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2105 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2106 }
2107 // If the minimum heap size has not been set (via -Xms),
2108 // synchronize with InitialHeapSize to avoid errors with the default value.
2109 if (min_heap_size() == 0) {
2110 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2111 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2112 }
2113 }
2114 }
2115
2116 // This option inspects the machine and attempts to set various
2117 // parameters to be optimal for long-running, memory allocation
2118 // intensive jobs. It is intended for machines with large
2119 // amounts of cpu and memory.
2120 jint Arguments::set_aggressive_heap_flags() {
2121 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2122 // VM, but we may not be able to represent the total physical memory
2123 // available (like having 8gb of memory on a box but using a 32bit VM).
2124 // Thus, we need to make sure we're using a julong for intermediate
2125 // calculations.
2126 julong initHeapSize;
2127 julong total_memory = os::physical_memory();
2128
2129 if (total_memory < (julong) 256 * M) {
2130 jio_fprintf(defaultStream::error_stream(),
2131 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2132 vm_exit(1);
2133 }
2134
2135 // The heap size is half of available memory, or (at most)
2136 // all of possible memory less 160mb (leaving room for the OS
2137 // when using ISM). This is the maximum; because adaptive sizing
2138 // is turned on below, the actual space used may be smaller.
2139
2140 initHeapSize = MIN2(total_memory / (julong) 2,
2141 total_memory - (julong) 160 * M);
2142
2143 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2144
2145 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2146 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2147 return JNI_EINVAL;
2148 }
2149 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2150 return JNI_EINVAL;
2151 }
2152 // Currently the minimum size and the initial heap sizes are the same.
2153 set_min_heap_size(initHeapSize);
2154 }
2155 if (FLAG_IS_DEFAULT(NewSize)) {
2156 // Make the young generation 3/8ths of the total heap.
2157 if (FLAG_SET_CMDLINE(size_t, NewSize,
2158 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2159 return JNI_EINVAL;
2160 }
2161 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2162 return JNI_EINVAL;
2163 }
2164 }
2165
2166 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2167 FLAG_SET_DEFAULT(UseLargePages, true);
2168 #endif
2169
2170 // Increase some data structure sizes for efficiency
2171 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2175 return JNI_EINVAL;
2176 }
2177 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2178 return JNI_EINVAL;
2179 }
2180
2181 // See the OldPLABSize comment below, but replace 'after promotion'
2182 // with 'after copying'. YoungPLABSize is the size of the survivor
2183 // space per-gc-thread buffers. The default is 4kw.
2184 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2185 return JNI_EINVAL;
2186 }
2187
2188 // OldPLABSize is the size of the buffers in the old gen that
2189 // UseParallelGC uses to promote live data that doesn't fit in the
2190 // survivor spaces. At any given time, there's one for each gc thread.
2191 // The default size is 1kw. These buffers are rarely used, since the
2192 // survivor spaces are usually big enough. For specjbb, however, there
2193 // are occasions when there's lots of live data in the young gen
2194 // and we end up promoting some of it. We don't have a definite
2195 // explanation for why bumping OldPLABSize helps, but the theory
2196 // is that a bigger PLAB results in retaining something like the
2197 // original allocation order after promotion, which improves mutator
2198 // locality. A minor effect may be that larger PLABs reduce the
2199 // number of PLAB allocation events during gc. The value of 8kw
2200 // was arrived at by experimenting with specjbb.
2201 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2202 return JNI_EINVAL;
2203 }
2204
2205 // Enable parallel GC and adaptive generation sizing
2206 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2207 return JNI_EINVAL;
2208 }
2209 FLAG_SET_DEFAULT(ParallelGCThreads,
2210 Abstract_VM_Version::parallel_worker_threads());
2211
2212 // Encourage steady state memory management
2213 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2214 return JNI_EINVAL;
2215 }
2216
2217 // This appears to improve mutator locality
2218 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221
2222 // Get around early Solaris scheduling bug
2223 // (affinity vs other jobs on system)
2224 // but disallow DR and offlining (5008695).
2225 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2226 return JNI_EINVAL;
2227 }
2228
2229 return JNI_OK;
2230 }
2231
2232 // This must be called after ergonomics.
2233 void Arguments::set_bytecode_flags() {
2234 if (!RewriteBytecodes) {
2235 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2236 }
2237 }
2238
2239 // Aggressive optimization flags -XX:+AggressiveOpts
2240 jint Arguments::set_aggressive_opts_flags() {
2241 #ifdef COMPILER2
2242 if (AggressiveUnboxing) {
2243 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2244 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2245 } else if (!EliminateAutoBox) {
2246 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2247 AggressiveUnboxing = false;
2248 }
2249 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2250 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2251 } else if (!DoEscapeAnalysis) {
2252 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2253 AggressiveUnboxing = false;
2254 }
2255 }
2256 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2257 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2258 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2259 }
2260 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2261 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2262 }
2263
2264 // Feed the cache size setting into the JDK
2265 char buffer[1024];
2266 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2267 if (!add_property(buffer)) {
2268 return JNI_ENOMEM;
2269 }
2270 }
2271 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2272 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2273 }
2274 #endif
2275
2276 if (AggressiveOpts) {
2277 // Sample flag setting code
2278 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2279 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2280 // }
2281 }
2282
2283 return JNI_OK;
2284 }
2285
2286 //===========================================================================================================
2287 // Parsing of java.compiler property
2288
2289 void Arguments::process_java_compiler_argument(const char* arg) {
2290 // For backwards compatibility, Djava.compiler=NONE or ""
2291 // causes us to switch to -Xint mode UNLESS -Xdebug
2292 // is also specified.
2293 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2294 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2295 }
2296 }
2297
2298 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2299 _sun_java_launcher = os::strdup_check_oom(launcher);
2300 }
2301
2302 bool Arguments::created_by_java_launcher() {
2303 assert(_sun_java_launcher != NULL, "property must have value");
2304 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2305 }
2306
2307 bool Arguments::sun_java_launcher_is_altjvm() {
2308 return _sun_java_launcher_is_altjvm;
2309 }
2310
2311 //===========================================================================================================
2312 // Parsing of main arguments
2313
2314 // Check consistency of GC selection
2315 bool Arguments::check_gc_consistency() {
2316 // Ensure that the user has not selected conflicting sets
2317 // of collectors.
2318 uint i = 0;
2319 if (UseSerialGC) i++;
2320 if (UseConcMarkSweepGC) i++;
2321 if (UseParallelGC || UseParallelOldGC) i++;
2322 if (UseG1GC) i++;
2323 if (i > 1) {
2324 jio_fprintf(defaultStream::error_stream(),
2325 "Conflicting collector combinations in option list; "
2326 "please refer to the release notes for the combinations "
2327 "allowed\n");
2328 return false;
2329 }
2330
2331 if (UseConcMarkSweepGC && !UseParNewGC) {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2334 return false;
2335 }
2336
2337 if (UseParNewGC && !UseConcMarkSweepGC) {
2338 jio_fprintf(defaultStream::error_stream(),
2339 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2340 return false;
2341 }
2342
2343 return true;
2344 }
2345
2346 // Check the consistency of vm_init_args
2347 bool Arguments::check_vm_args_consistency() {
2348 // Method for adding checks for flag consistency.
2349 // The intent is to warn the user of all possible conflicts,
2350 // before returning an error.
2351 // Note: Needs platform-dependent factoring.
2352 bool status = true;
2353
2354 if (TLABRefillWasteFraction == 0) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "TLABRefillWasteFraction should be a denominator, "
2357 "not " SIZE_FORMAT "\n",
2358 TLABRefillWasteFraction);
2359 status = false;
2360 }
2361
2362 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2363 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2364 }
2365
2366 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2367 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2368 }
2369
2370 if (GCTimeLimit == 100) {
2371 // Turn off gc-overhead-limit-exceeded checks
2372 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2373 }
2374
2375 status = status && check_gc_consistency();
2376
2377 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2378 // insists that we hold the requisite locks so that the iteration is
2379 // MT-safe. For the verification at start-up and shut-down, we don't
2380 // yet have a good way of acquiring and releasing these locks,
2381 // which are not visible at the CollectedHeap level. We want to
2382 // be able to acquire these locks and then do the iteration rather
2383 // than just disable the lock verification. This will be fixed under
2384 // bug 4788986.
2385 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2386 if (VerifyDuringStartup) {
2387 warning("Heap verification at start-up disabled "
2388 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2389 VerifyDuringStartup = false; // Disable verification at start-up
2390 }
2391
2392 if (VerifyBeforeExit) {
2393 warning("Heap verification at shutdown disabled "
2394 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2395 VerifyBeforeExit = false; // Disable verification at shutdown
2396 }
2397 }
2398
2399 if (PrintNMTStatistics) {
2400 #if INCLUDE_NMT
2401 if (MemTracker::tracking_level() == NMT_off) {
2402 #endif // INCLUDE_NMT
2403 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2404 PrintNMTStatistics = false;
2405 #if INCLUDE_NMT
2406 }
2407 #endif
2408 }
2409 #if INCLUDE_JVMCI
2410 if (EnableJVMCI) {
2411 if (!ScavengeRootsInCode) {
2412 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2413 ScavengeRootsInCode = 1;
2414 }
2415 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2416 TypeProfileLevel = 0;
2417 }
2418 if (UseJVMCICompiler) {
2419 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2420 TypeProfileWidth = 8;
2421 }
2422 }
2423 }
2424 #endif
2425
2426 // Check lower bounds of the code cache
2427 // Template Interpreter code is approximately 3X larger in debug builds.
2428 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2429 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2432 os::vm_page_size()/K);
2433 status = false;
2434 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2435 jio_fprintf(defaultStream::error_stream(),
2436 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2437 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2438 status = false;
2439 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2442 min_code_cache_size/K);
2443 status = false;
2444 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2445 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2446 jio_fprintf(defaultStream::error_stream(),
2447 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2448 CODE_CACHE_SIZE_LIMIT/M);
2449 status = false;
2450 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2453 min_code_cache_size/K);
2454 status = false;
2455 }
2456
2457 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2458 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2459 }
2460
2461 #ifndef SUPPORT_RESERVED_STACK_AREA
2462 if (StackReservedPages != 0) {
2463 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2464 warning("Reserved Stack Area not supported on this platform");
2465 }
2466 #endif
2467 return status;
2468 }
2469
2470 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2471 const char* option_type) {
2472 if (ignore) return false;
2473
2474 const char* spacer = " ";
2475 if (option_type == NULL) {
2476 option_type = ++spacer; // Set both to the empty string.
2477 }
2478
2479 if (os::obsolete_option(option)) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Obsolete %s%soption: %s\n", option_type, spacer,
2482 option->optionString);
2483 return false;
2484 } else {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Unrecognized %s%soption: %s\n", option_type, spacer,
2487 option->optionString);
2488 return true;
2489 }
2490 }
2491
2492 static const char* user_assertion_options[] = {
2493 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2494 };
2495
2496 static const char* system_assertion_options[] = {
2497 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2498 };
2499
2500 bool Arguments::parse_uintx(const char* value,
2501 uintx* uintx_arg,
2502 uintx min_size) {
2503
2504 // Check the sign first since atomull() parses only unsigned values.
2505 bool value_is_positive = !(*value == '-');
2506
2507 if (value_is_positive) {
2508 julong n;
2509 bool good_return = atomull(value, &n);
2510 if (good_return) {
2511 bool above_minimum = n >= min_size;
2512 bool value_is_too_large = n > max_uintx;
2513
2514 if (above_minimum && !value_is_too_large) {
2515 *uintx_arg = n;
2516 return true;
2517 }
2518 }
2519 }
2520 return false;
2521 }
2522
2523 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2524 julong* long_arg,
2525 julong min_size) {
2526 if (!atomull(s, long_arg)) return arg_unreadable;
2527 return check_memory_size(*long_arg, min_size);
2528 }
2529
2530 // Parse JavaVMInitArgs structure
2531
2532 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2533 const JavaVMInitArgs *java_options_args,
2534 const JavaVMInitArgs *cmd_line_args) {
2535 // For components of the system classpath.
2536 SysClassPath scp(Arguments::get_sysclasspath());
2537 bool scp_assembly_required = false;
2538
2539 // Save default settings for some mode flags
2540 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2541 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2542 Arguments::_ClipInlining = ClipInlining;
2543 Arguments::_BackgroundCompilation = BackgroundCompilation;
2544 if (TieredCompilation) {
2545 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2546 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2547 }
2548
2549 // Setup flags for mixed which is the default
2550 set_mode_flags(_mixed);
2551
2552 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2553 // variable (if present).
2554 jint result = parse_each_vm_init_arg(
2555 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2556 if (result != JNI_OK) {
2557 return result;
2558 }
2559
2560 // Parse args structure generated from the command line flags.
2561 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2562 Flag::COMMAND_LINE);
2563 if (result != JNI_OK) {
2564 return result;
2565 }
2566
2567 // Parse args structure generated from the _JAVA_OPTIONS environment
2568 // variable (if present) (mimics classic VM)
2569 result = parse_each_vm_init_arg(
2570 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2571 if (result != JNI_OK) {
2572 return result;
2573 }
2574
2575 // Do final processing now that all arguments have been parsed
2576 result = finalize_vm_init_args(&scp, scp_assembly_required);
2577 if (result != JNI_OK) {
2578 return result;
2579 }
2580
2581 return JNI_OK;
2582 }
2583
2584 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2585 // represents a valid JDWP agent. is_path==true denotes that we
2586 // are dealing with -agentpath (case where name is a path), otherwise with
2587 // -agentlib
2588 bool valid_jdwp_agent(char *name, bool is_path) {
2589 char *_name;
2590 const char *_jdwp = "jdwp";
2591 size_t _len_jdwp, _len_prefix;
2592
2593 if (is_path) {
2594 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2595 return false;
2596 }
2597
2598 _name++; // skip past last path separator
2599 _len_prefix = strlen(JNI_LIB_PREFIX);
2600
2601 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2602 return false;
2603 }
2604
2605 _name += _len_prefix;
2606 _len_jdwp = strlen(_jdwp);
2607
2608 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2609 _name += _len_jdwp;
2610 }
2611 else {
2612 return false;
2613 }
2614
2615 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2616 return false;
2617 }
2618
2619 return true;
2620 }
2621
2622 if (strcmp(name, _jdwp) == 0) {
2623 return true;
2624 }
2625
2626 return false;
2627 }
2628
2629 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2630 SysClassPath* scp_p,
2631 bool* scp_assembly_required_p,
2632 Flag::Flags origin) {
2633 // For match_option to return remaining or value part of option string
2634 const char* tail;
2635
2636 // iterate over arguments
2637 for (int index = 0; index < args->nOptions; index++) {
2638 bool is_absolute_path = false; // for -agentpath vs -agentlib
2639
2640 const JavaVMOption* option = args->options + index;
2641
2642 if (!match_option(option, "-Djava.class.path", &tail) &&
2643 !match_option(option, "-Dsun.java.command", &tail) &&
2644 !match_option(option, "-Dsun.java.launcher", &tail)) {
2645
2646 // add all jvm options to the jvm_args string. This string
2647 // is used later to set the java.vm.args PerfData string constant.
2648 // the -Djava.class.path and the -Dsun.java.command options are
2649 // omitted from jvm_args string as each have their own PerfData
2650 // string constant object.
2651 build_jvm_args(option->optionString);
2652 }
2653
2654 // -verbose:[class/gc/jni]
2655 if (match_option(option, "-verbose", &tail)) {
2656 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2657 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2658 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2659 } else if (!strcmp(tail, ":gc")) {
2660 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2661 } else if (!strcmp(tail, ":jni")) {
2662 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 }
2666 // -da / -ea / -disableassertions / -enableassertions
2667 // These accept an optional class/package name separated by a colon, e.g.,
2668 // -da:java.lang.Thread.
2669 } else if (match_option(option, user_assertion_options, &tail, true)) {
2670 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2671 if (*tail == '\0') {
2672 JavaAssertions::setUserClassDefault(enable);
2673 } else {
2674 assert(*tail == ':', "bogus match by match_option()");
2675 JavaAssertions::addOption(tail + 1, enable);
2676 }
2677 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2678 } else if (match_option(option, system_assertion_options, &tail, false)) {
2679 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2680 JavaAssertions::setSystemClassDefault(enable);
2681 // -bootclasspath:
2682 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2683 scp_p->reset_path(tail);
2684 *scp_assembly_required_p = true;
2685 // -bootclasspath/a:
2686 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2687 scp_p->add_suffix(tail);
2688 *scp_assembly_required_p = true;
2689 // -bootclasspath/p:
2690 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2691 scp_p->add_prefix(tail);
2692 *scp_assembly_required_p = true;
2693 // -Xrun
2694 } else if (match_option(option, "-Xrun", &tail)) {
2695 if (tail != NULL) {
2696 const char* pos = strchr(tail, ':');
2697 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2698 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2699 name[len] = '\0';
2700
2701 char *options = NULL;
2702 if(pos != NULL) {
2703 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2704 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2705 }
2706 #if !INCLUDE_JVMTI
2707 if (strcmp(name, "jdwp") == 0) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Debugging agents are not supported in this VM\n");
2710 return JNI_ERR;
2711 }
2712 #endif // !INCLUDE_JVMTI
2713 add_init_library(name, options);
2714 }
2715 // -agentlib and -agentpath
2716 } else if (match_option(option, "-agentlib:", &tail) ||
2717 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2718 if(tail != NULL) {
2719 const char* pos = strchr(tail, '=');
2720 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2721 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2722 name[len] = '\0';
2723
2724 char *options = NULL;
2725 if(pos != NULL) {
2726 options = os::strdup_check_oom(pos + 1, mtInternal);
2727 }
2728 #if !INCLUDE_JVMTI
2729 if (valid_jdwp_agent(name, is_absolute_path)) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Debugging agents are not supported in this VM\n");
2732 return JNI_ERR;
2733 }
2734 #endif // !INCLUDE_JVMTI
2735 add_init_agent(name, options, is_absolute_path);
2736 }
2737 // -javaagent
2738 } else if (match_option(option, "-javaagent:", &tail)) {
2739 #if !INCLUDE_JVMTI
2740 jio_fprintf(defaultStream::error_stream(),
2741 "Instrumentation agents are not supported in this VM\n");
2742 return JNI_ERR;
2743 #else
2744 if(tail != NULL) {
2745 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2746 add_init_agent("instrument", options, false);
2747 }
2748 #endif // !INCLUDE_JVMTI
2749 // -Xnoclassgc
2750 } else if (match_option(option, "-Xnoclassgc")) {
2751 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 // -Xconcgc
2755 } else if (match_option(option, "-Xconcgc")) {
2756 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 // -Xnoconcgc
2760 } else if (match_option(option, "-Xnoconcgc")) {
2761 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 // -Xbatch
2765 } else if (match_option(option, "-Xbatch")) {
2766 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 // -Xmn for compatibility with other JVM vendors
2770 } else if (match_option(option, "-Xmn", &tail)) {
2771 julong long_initial_young_size = 0;
2772 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2773 if (errcode != arg_in_range) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid initial young generation size: %s\n", option->optionString);
2776 describe_range_error(errcode);
2777 return JNI_EINVAL;
2778 }
2779 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 // -Xms
2786 } else if (match_option(option, "-Xms", &tail)) {
2787 julong long_initial_heap_size = 0;
2788 // an initial heap size of 0 means automatically determine
2789 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2790 if (errcode != arg_in_range) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Invalid initial heap size: %s\n", option->optionString);
2793 describe_range_error(errcode);
2794 return JNI_EINVAL;
2795 }
2796 set_min_heap_size((size_t)long_initial_heap_size);
2797 // Currently the minimum size and the initial heap sizes are the same.
2798 // Can be overridden with -XX:InitialHeapSize.
2799 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 // -Xmx
2803 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2804 julong long_max_heap_size = 0;
2805 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2806 if (errcode != arg_in_range) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Invalid maximum heap size: %s\n", option->optionString);
2809 describe_range_error(errcode);
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 // Xmaxf
2816 } else if (match_option(option, "-Xmaxf", &tail)) {
2817 char* err;
2818 int maxf = (int)(strtod(tail, &err) * 100);
2819 if (*err != '\0' || *tail == '\0') {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Bad max heap free percentage size: %s\n",
2822 option->optionString);
2823 return JNI_EINVAL;
2824 } else {
2825 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 }
2829 // Xminf
2830 } else if (match_option(option, "-Xminf", &tail)) {
2831 char* err;
2832 int minf = (int)(strtod(tail, &err) * 100);
2833 if (*err != '\0' || *tail == '\0') {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Bad min heap free percentage size: %s\n",
2836 option->optionString);
2837 return JNI_EINVAL;
2838 } else {
2839 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 }
2843 // -Xss
2844 } else if (match_option(option, "-Xss", &tail)) {
2845 julong long_ThreadStackSize = 0;
2846 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2847 if (errcode != arg_in_range) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid thread stack size: %s\n", option->optionString);
2850 describe_range_error(errcode);
2851 return JNI_EINVAL;
2852 }
2853 // Internally track ThreadStackSize in units of 1024 bytes.
2854 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2855 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2859 } else if (match_option(option, "-Xoss", &tail) ||
2860 match_option(option, "-Xsqnopause") ||
2861 match_option(option, "-Xoptimize") ||
2862 match_option(option, "-Xboundthreads") ||
2863 match_option(option, "-Xusealtsigs")) {
2864 // All these options are deprecated in JDK 9 and will be removed in a future release
2865 char version[256];
2866 JDK_Version::jdk(9).to_string(version, sizeof(version));
2867 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2868 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2869 julong long_CodeCacheExpansionSize = 0;
2870 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2871 if (errcode != arg_in_range) {
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2874 os::vm_page_size()/K);
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2881 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2882 julong long_ReservedCodeCacheSize = 0;
2883
2884 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2885 if (errcode != arg_in_range) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Invalid maximum code cache size: %s.\n", option->optionString);
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 // -XX:NonNMethodCodeHeapSize=
2894 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2895 julong long_NonNMethodCodeHeapSize = 0;
2896
2897 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2898 if (errcode != arg_in_range) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2901 return JNI_EINVAL;
2902 }
2903 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 // -XX:ProfiledCodeHeapSize=
2907 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2908 julong long_ProfiledCodeHeapSize = 0;
2909
2910 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2911 if (errcode != arg_in_range) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 // -XX:NonProfiledCodeHeapSizee=
2920 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2921 julong long_NonProfiledCodeHeapSize = 0;
2922
2923 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2924 if (errcode != arg_in_range) {
2925 jio_fprintf(defaultStream::error_stream(),
2926 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2927 return JNI_EINVAL;
2928 }
2929 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 // -green
2933 } else if (match_option(option, "-green")) {
2934 jio_fprintf(defaultStream::error_stream(),
2935 "Green threads support not available\n");
2936 return JNI_EINVAL;
2937 // -native
2938 } else if (match_option(option, "-native")) {
2939 // HotSpot always uses native threads, ignore silently for compatibility
2940 // -Xrs
2941 } else if (match_option(option, "-Xrs")) {
2942 // Classic/EVM option, new functionality
2943 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 // -Xprof
2947 } else if (match_option(option, "-Xprof")) {
2948 #if INCLUDE_FPROF
2949 _has_profile = true;
2950 #else // INCLUDE_FPROF
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Flat profiling is not supported in this VM.\n");
2953 return JNI_ERR;
2954 #endif // INCLUDE_FPROF
2955 // -Xconcurrentio
2956 } else if (match_option(option, "-Xconcurrentio")) {
2957 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2970 return JNI_EINVAL;
2971 }
2972
2973 // -Xinternalversion
2974 } else if (match_option(option, "-Xinternalversion")) {
2975 jio_fprintf(defaultStream::output_stream(), "%s\n",
2976 VM_Version::internal_vm_info_string());
2977 vm_exit(0);
2978 #ifndef PRODUCT
2979 // -Xprintflags
2980 } else if (match_option(option, "-Xprintflags")) {
2981 CommandLineFlags::printFlags(tty, false);
2982 vm_exit(0);
2983 #endif
2984 // -D
2985 } else if (match_option(option, "-D", &tail)) {
2986 const char* value;
2987 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2988 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2989 // abort if -Djava.endorsed.dirs is set
2990 jio_fprintf(defaultStream::output_stream(),
2991 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2992 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2993 return JNI_EINVAL;
2994 }
2995 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2996 *value != '\0' && strcmp(value, "\"\"") != 0) {
2997 // abort if -Djava.ext.dirs is set
2998 jio_fprintf(defaultStream::output_stream(),
2999 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3000 return JNI_EINVAL;
3001 }
3002
3003 if (!add_property(tail)) {
3004 return JNI_ENOMEM;
3005 }
3006 // Out of the box management support
3007 if (match_option(option, "-Dcom.sun.management", &tail)) {
3008 #if INCLUDE_MANAGEMENT
3009 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 #else
3013 jio_fprintf(defaultStream::output_stream(),
3014 "-Dcom.sun.management is not supported in this VM.\n");
3015 return JNI_ERR;
3016 #endif
3017 }
3018 // -Xint
3019 } else if (match_option(option, "-Xint")) {
3020 set_mode_flags(_int);
3021 // -Xmixed
3022 } else if (match_option(option, "-Xmixed")) {
3023 set_mode_flags(_mixed);
3024 // -Xcomp
3025 } else if (match_option(option, "-Xcomp")) {
3026 // for testing the compiler; turn off all flags that inhibit compilation
3027 set_mode_flags(_comp);
3028 // -Xshare:dump
3029 } else if (match_option(option, "-Xshare:dump")) {
3030 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 set_mode_flags(_int); // Prevent compilation, which creates objects
3034 // -Xshare:on
3035 } else if (match_option(option, "-Xshare:on")) {
3036 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 // -Xshare:auto
3043 } else if (match_option(option, "-Xshare:auto")) {
3044 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -Xshare:off
3051 } else if (match_option(option, "-Xshare:off")) {
3052 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 // -Xverify
3059 } else if (match_option(option, "-Xverify", &tail)) {
3060 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3061 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3065 return JNI_EINVAL;
3066 }
3067 } else if (strcmp(tail, ":remote") == 0) {
3068 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 } else if (strcmp(tail, ":none") == 0) {
3075 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3076 return JNI_EINVAL;
3077 }
3078 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3082 return JNI_EINVAL;
3083 }
3084 // -Xdebug
3085 } else if (match_option(option, "-Xdebug")) {
3086 // note this flag has been used, then ignore
3087 set_xdebug_mode(true);
3088 // -Xnoagent
3089 } else if (match_option(option, "-Xnoagent")) {
3090 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3091 } else if (match_option(option, "-Xlog", &tail)) {
3092 bool ret = false;
3093 if (strcmp(tail, ":help") == 0) {
3094 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3095 vm_exit(0);
3096 } else if (strcmp(tail, ":disable") == 0) {
3097 LogConfiguration::disable_logging();
3098 ret = true;
3099 } else if (*tail == '\0') {
3100 ret = LogConfiguration::parse_command_line_arguments();
3101 assert(ret, "-Xlog without arguments should never fail to parse");
3102 } else if (*tail == ':') {
3103 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3104 }
3105 if (ret == false) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Invalid -Xlog option '-Xlog%s'\n",
3108 tail);
3109 return JNI_EINVAL;
3110 }
3111 // JNI hooks
3112 } else if (match_option(option, "-Xcheck", &tail)) {
3113 if (!strcmp(tail, ":jni")) {
3114 #if !INCLUDE_JNI_CHECK
3115 warning("JNI CHECKING is not supported in this VM");
3116 #else
3117 CheckJNICalls = true;
3118 #endif // INCLUDE_JNI_CHECK
3119 } else if (is_bad_option(option, args->ignoreUnrecognized,
3120 "check")) {
3121 return JNI_EINVAL;
3122 }
3123 } else if (match_option(option, "vfprintf")) {
3124 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3125 } else if (match_option(option, "exit")) {
3126 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3127 } else if (match_option(option, "abort")) {
3128 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3129 // -XX:+AggressiveHeap
3130 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3131 jint result = set_aggressive_heap_flags();
3132 if (result != JNI_OK) {
3133 return result;
3134 }
3135 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3136 // and the last option wins.
3137 } else if (match_option(option, "-XX:+NeverTenure")) {
3138 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3145 return JNI_EINVAL;
3146 }
3147 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3148 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3158 uintx max_tenuring_thresh = 0;
3159 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3160 jio_fprintf(defaultStream::error_stream(),
3161 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3162 return JNI_EINVAL;
3163 }
3164
3165 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168
3169 if (MaxTenuringThreshold == 0) {
3170 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 } else {
3177 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 }
3184 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3185 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3192 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3199 #if defined(DTRACE_ENABLED)
3200 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 #else // defined(DTRACE_ENABLED)
3213 jio_fprintf(defaultStream::error_stream(),
3214 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3215 return JNI_EINVAL;
3216 #endif // defined(DTRACE_ENABLED)
3217 #ifdef ASSERT
3218 } else if (match_option(option, "-XX:+FullGCALot")) {
3219 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 // disable scavenge before parallel mark-compact
3223 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 #endif
3227 #if !INCLUDE_MANAGEMENT
3228 } else if (match_option(option, "-XX:+ManagementServer")) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "ManagementServer is not supported in this VM.\n");
3231 return JNI_ERR;
3232 #endif // INCLUDE_MANAGEMENT
3233 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3234 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3235 // already been handled
3236 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3237 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3238 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3239 return JNI_EINVAL;
3240 }
3241 }
3242 // Unknown option
3243 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3244 return JNI_ERR;
3245 }
3246 }
3247
3248 // PrintSharedArchiveAndExit will turn on
3249 // -Xshare:on
3250 // -XX:+TraceClassPaths
3251 if (PrintSharedArchiveAndExit) {
3252 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3256 return JNI_EINVAL;
3257 }
3258 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3259 return JNI_EINVAL;
3260 }
3261 }
3262
3263 // Change the default value for flags which have different default values
3264 // when working with older JDKs.
3265 #ifdef LINUX
3266 if (JDK_Version::current().compare_major(6) <= 0 &&
3267 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3268 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3269 }
3270 #endif // LINUX
3271 fix_appclasspath();
3272 return JNI_OK;
3273 }
3274
3275 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3276 //
3277 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3278 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3279 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3280 // path is treated as the current directory.
3281 //
3282 // This causes problems with CDS, which requires that all directories specified in the classpath
3283 // must be empty. In most cases, applications do NOT want to load classes from the current
3284 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3285 // scripts compatible with CDS.
3286 void Arguments::fix_appclasspath() {
3287 if (IgnoreEmptyClassPaths) {
3288 const char separator = *os::path_separator();
3289 const char* src = _java_class_path->value();
3290
3291 // skip over all the leading empty paths
3292 while (*src == separator) {
3293 src ++;
3294 }
3295
3296 char* copy = os::strdup_check_oom(src, mtInternal);
3297
3298 // trim all trailing empty paths
3299 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3300 *tail = '\0';
3301 }
3302
3303 char from[3] = {separator, separator, '\0'};
3304 char to [2] = {separator, '\0'};
3305 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3306 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3307 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3308 }
3309
3310 _java_class_path->set_value(copy);
3311 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3312 }
3313
3314 if (!PrintSharedArchiveAndExit) {
3315 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3316 }
3317 }
3318
3319 static bool has_jar_files(const char* directory) {
3320 DIR* dir = os::opendir(directory);
3321 if (dir == NULL) return false;
3322
3323 struct dirent *entry;
3324 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3325 bool hasJarFile = false;
3326 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3327 const char* name = entry->d_name;
3328 const char* ext = name + strlen(name) - 4;
3329 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3330 }
3331 FREE_C_HEAP_ARRAY(char, dbuf);
3332 os::closedir(dir);
3333 return hasJarFile ;
3334 }
3335
3336 static int check_non_empty_dirs(const char* path) {
3337 const char separator = *os::path_separator();
3338 const char* const end = path + strlen(path);
3339 int nonEmptyDirs = 0;
3340 while (path < end) {
3341 const char* tmp_end = strchr(path, separator);
3342 if (tmp_end == NULL) {
3343 if (has_jar_files(path)) {
3344 nonEmptyDirs++;
3345 jio_fprintf(defaultStream::output_stream(),
3346 "Non-empty directory: %s\n", path);
3347 }
3348 path = end;
3349 } else {
3350 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3351 memcpy(dirpath, path, tmp_end - path);
3352 dirpath[tmp_end - path] = '\0';
3353 if (has_jar_files(dirpath)) {
3354 nonEmptyDirs++;
3355 jio_fprintf(defaultStream::output_stream(),
3356 "Non-empty directory: %s\n", dirpath);
3357 }
3358 FREE_C_HEAP_ARRAY(char, dirpath);
3359 path = tmp_end + 1;
3360 }
3361 }
3362 return nonEmptyDirs;
3363 }
3364
3365 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3366 // check if the default lib/endorsed directory exists; if so, error
3367 char path[JVM_MAXPATHLEN];
3368 const char* fileSep = os::file_separator();
3369 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3370
3371 if (CheckEndorsedAndExtDirs) {
3372 int nonEmptyDirs = 0;
3373 // check endorsed directory
3374 nonEmptyDirs += check_non_empty_dirs(path);
3375 // check the extension directories
3376 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3377 if (nonEmptyDirs > 0) {
3378 return JNI_ERR;
3379 }
3380 }
3381
3382 DIR* dir = os::opendir(path);
3383 if (dir != NULL) {
3384 jio_fprintf(defaultStream::output_stream(),
3385 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3386 "in modular form will be supported via the concept of upgradeable modules.\n");
3387 os::closedir(dir);
3388 return JNI_ERR;
3389 }
3390
3391 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3392 dir = os::opendir(path);
3393 if (dir != NULL) {
3394 jio_fprintf(defaultStream::output_stream(),
3395 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3396 "Use -classpath instead.\n.");
3397 os::closedir(dir);
3398 return JNI_ERR;
3399 }
3400
3401 if (scp_assembly_required) {
3402 // Assemble the bootclasspath elements into the final path.
3403 char *combined_path = scp_p->combined_path();
3404 Arguments::set_sysclasspath(combined_path);
3405 FREE_C_HEAP_ARRAY(char, combined_path);
3406 }
3407
3408 // This must be done after all arguments have been processed.
3409 // java_compiler() true means set to "NONE" or empty.
3410 if (java_compiler() && !xdebug_mode()) {
3411 // For backwards compatibility, we switch to interpreted mode if
3412 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3413 // not specified.
3414 set_mode_flags(_int);
3415 }
3416
3417 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3418 // but like -Xint, leave compilation thresholds unaffected.
3419 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3420 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3421 set_mode_flags(_int);
3422 }
3423
3424 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3425 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3426 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3427 }
3428
3429 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3430 // Don't degrade server performance for footprint
3431 if (FLAG_IS_DEFAULT(UseLargePages) &&
3432 MaxHeapSize < LargePageHeapSizeThreshold) {
3433 // No need for large granularity pages w/small heaps.
3434 // Note that large pages are enabled/disabled for both the
3435 // Java heap and the code cache.
3436 FLAG_SET_DEFAULT(UseLargePages, false);
3437 }
3438
3439 #elif defined(COMPILER2)
3440 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3441 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3442 }
3443 #endif
3444
3445 #ifndef TIERED
3446 // Tiered compilation is undefined.
3447 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3448 #endif
3449
3450 // If we are running in a headless jre, force java.awt.headless property
3451 // to be true unless the property has already been set.
3452 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3453 if (os::is_headless_jre()) {
3454 const char* headless = Arguments::get_property("java.awt.headless");
3455 if (headless == NULL) {
3456 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3457 if (headless_env == NULL) {
3458 if (!add_property("java.awt.headless=true")) {
3459 return JNI_ENOMEM;
3460 }
3461 } else {
3462 char buffer[256];
3463 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3464 if (!add_property(buffer)) {
3465 return JNI_ENOMEM;
3466 }
3467 }
3468 }
3469 }
3470
3471 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3472 // CMS can only be used with ParNew
3473 FLAG_SET_ERGO(bool, UseParNewGC, true);
3474 }
3475
3476 if (!check_vm_args_consistency()) {
3477 return JNI_ERR;
3478 }
3479
3480 return JNI_OK;
3481 }
3482
3483 // Helper class for controlling the lifetime of JavaVMInitArgs
3484 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3485 // deleted on the destruction of the ScopedVMInitArgs object.
3486 class ScopedVMInitArgs : public StackObj {
3487 private:
3488 JavaVMInitArgs _args;
3489 char* _container_name;
3490 bool _is_set;
3491 char* _vm_options_file_arg;
3492
3493 public:
3494 ScopedVMInitArgs(const char *container_name) {
3495 _args.version = JNI_VERSION_1_2;
3496 _args.nOptions = 0;
3497 _args.options = NULL;
3498 _args.ignoreUnrecognized = false;
3499 _container_name = (char *)container_name;
3500 _is_set = false;
3501 _vm_options_file_arg = NULL;
3502 }
3503
3504 // Populates the JavaVMInitArgs object represented by this
3505 // ScopedVMInitArgs object with the arguments in options. The
3506 // allocated memory is deleted by the destructor. If this method
3507 // returns anything other than JNI_OK, then this object is in a
3508 // partially constructed state, and should be abandoned.
3509 jint set_args(GrowableArray<JavaVMOption>* options) {
3510 _is_set = true;
3511 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3512 JavaVMOption, options->length(), mtInternal);
3513 if (options_arr == NULL) {
3514 return JNI_ENOMEM;
3515 }
3516 _args.options = options_arr;
3517
3518 for (int i = 0; i < options->length(); i++) {
3519 options_arr[i] = options->at(i);
3520 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3521 if (options_arr[i].optionString == NULL) {
3522 // Rely on the destructor to do cleanup.
3523 _args.nOptions = i;
3524 return JNI_ENOMEM;
3525 }
3526 }
3527
3528 _args.nOptions = options->length();
3529 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3530 return JNI_OK;
3531 }
3532
3533 JavaVMInitArgs* get() { return &_args; }
3534 char* container_name() { return _container_name; }
3535 bool is_set() { return _is_set; }
3536 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3537 char* vm_options_file_arg() { return _vm_options_file_arg; }
3538
3539 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3540 if (_vm_options_file_arg != NULL) {
3541 os::free(_vm_options_file_arg);
3542 }
3543 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3544 }
3545
3546 ~ScopedVMInitArgs() {
3547 if (_vm_options_file_arg != NULL) {
3548 os::free(_vm_options_file_arg);
3549 }
3550 if (_args.options == NULL) return;
3551 for (int i = 0; i < _args.nOptions; i++) {
3552 os::free(_args.options[i].optionString);
3553 }
3554 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3555 }
3556
3557 // Insert options into this option list, to replace option at
3558 // vm_options_file_pos (-XX:VMOptionsFile)
3559 jint insert(const JavaVMInitArgs* args,
3560 const JavaVMInitArgs* args_to_insert,
3561 const int vm_options_file_pos) {
3562 assert(_args.options == NULL, "shouldn't be set yet");
3563 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3564 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3565
3566 int length = args->nOptions + args_to_insert->nOptions - 1;
3567 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3568 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3569 for (int i = 0; i < args->nOptions; i++) {
3570 if (i == vm_options_file_pos) {
3571 // insert the new options starting at the same place as the
3572 // -XX:VMOptionsFile option
3573 for (int j = 0; j < args_to_insert->nOptions; j++) {
3574 options->push(args_to_insert->options[j]);
3575 }
3576 } else {
3577 options->push(args->options[i]);
3578 }
3579 }
3580 // make into options array
3581 jint result = set_args(options);
3582 delete options;
3583 return result;
3584 }
3585 };
3586
3587 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3588 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3589 }
3590
3591 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3592 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3593 }
3594
3595 jint Arguments::parse_options_environment_variable(const char* name,
3596 ScopedVMInitArgs* vm_args) {
3597 char *buffer = ::getenv(name);
3598
3599 // Don't check this environment variable if user has special privileges
3600 // (e.g. unix su command).
3601 if (buffer == NULL || os::have_special_privileges()) {
3602 return JNI_OK;
3603 }
3604
3605 if ((buffer = os::strdup(buffer)) == NULL) {
3606 return JNI_ENOMEM;
3607 }
3608
3609 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3610
3611 os::free(buffer);
3612 return retcode;
3613 }
3614
3615 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3616 // read file into buffer
3617 int fd = ::open(file_name, O_RDONLY);
3618 if (fd < 0) {
3619 jio_fprintf(defaultStream::error_stream(),
3620 "Could not open options file '%s'\n",
3621 file_name);
3622 return JNI_ERR;
3623 }
3624
3625 struct stat stbuf;
3626 int retcode = os::stat(file_name, &stbuf);
3627 if (retcode != 0) {
3628 jio_fprintf(defaultStream::error_stream(),
3629 "Could not stat options file '%s'\n",
3630 file_name);
3631 os::close(fd);
3632 return JNI_ERR;
3633 }
3634
3635 if (stbuf.st_size == 0) {
3636 // tell caller there is no option data and that is ok
3637 os::close(fd);
3638 return JNI_OK;
3639 }
3640
3641 // '+ 1' for NULL termination even with max bytes
3642 size_t bytes_alloc = stbuf.st_size + 1;
3643
3644 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3645 if (NULL == buf) {
3646 jio_fprintf(defaultStream::error_stream(),
3647 "Could not allocate read buffer for options file parse\n");
3648 os::close(fd);
3649 return JNI_ENOMEM;
3650 }
3651
3652 memset(buf, 0, bytes_alloc);
3653
3654 // Fill buffer
3655 // Use ::read() instead of os::read because os::read()
3656 // might do a thread state transition
3657 // and it is too early for that here
3658
3659 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3660 os::close(fd);
3661 if (bytes_read < 0) {
3662 FREE_C_HEAP_ARRAY(char, buf);
3663 jio_fprintf(defaultStream::error_stream(),
3664 "Could not read options file '%s'\n", file_name);
3665 return JNI_ERR;
3666 }
3667
3668 if (bytes_read == 0) {
3669 // tell caller there is no option data and that is ok
3670 FREE_C_HEAP_ARRAY(char, buf);
3671 return JNI_OK;
3672 }
3673
3674 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3675
3676 FREE_C_HEAP_ARRAY(char, buf);
3677 return retcode;
3678 }
3679
3680 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3681 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3682
3683 // some pointers to help with parsing
3684 char *buffer_end = buffer + buf_len;
3685 char *opt_hd = buffer;
3686 char *wrt = buffer;
3687 char *rd = buffer;
3688
3689 // parse all options
3690 while (rd < buffer_end) {
3691 // skip leading white space from the input string
3692 while (rd < buffer_end && isspace(*rd)) {
3693 rd++;
3694 }
3695
3696 if (rd >= buffer_end) {
3697 break;
3698 }
3699
3700 // Remember this is where we found the head of the token.
3701 opt_hd = wrt;
3702
3703 // Tokens are strings of non white space characters separated
3704 // by one or more white spaces.
3705 while (rd < buffer_end && !isspace(*rd)) {
3706 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3707 int quote = *rd; // matching quote to look for
3708 rd++; // don't copy open quote
3709 while (rd < buffer_end && *rd != quote) {
3710 // include everything (even spaces)
3711 // up until the close quote
3712 *wrt++ = *rd++; // copy to option string
3713 }
3714
3715 if (rd < buffer_end) {
3716 rd++; // don't copy close quote
3717 } else {
3718 // did not see closing quote
3719 jio_fprintf(defaultStream::error_stream(),
3720 "Unmatched quote in %s\n", name);
3721 delete options;
3722 return JNI_ERR;
3723 }
3724 } else {
3725 *wrt++ = *rd++; // copy to option string
3726 }
3727 }
3728
3729 // steal a white space character and set it to NULL
3730 *wrt++ = '\0';
3731 // We now have a complete token
3732
3733 JavaVMOption option;
3734 option.optionString = opt_hd;
3735 option.extraInfo = NULL;
3736
3737 options->append(option); // Fill in option
3738
3739 rd++; // Advance to next character
3740 }
3741
3742 // Fill out JavaVMInitArgs structure.
3743 jint status = vm_args->set_args(options);
3744
3745 delete options;
3746 return status;
3747 }
3748
3749 void Arguments::set_shared_spaces_flags() {
3750 if (DumpSharedSpaces) {
3751 if (RequireSharedSpaces) {
3752 warning("Cannot dump shared archive while using shared archive");
3753 }
3754 UseSharedSpaces = false;
3755 #ifdef _LP64
3756 if (!UseCompressedOops || !UseCompressedClassPointers) {
3757 vm_exit_during_initialization(
3758 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3759 }
3760 } else {
3761 if (!UseCompressedOops || !UseCompressedClassPointers) {
3762 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3763 }
3764 #endif
3765 }
3766 }
3767
3768 #if !INCLUDE_ALL_GCS
3769 static void force_serial_gc() {
3770 FLAG_SET_DEFAULT(UseSerialGC, true);
3771 UNSUPPORTED_GC_OPTION(UseG1GC);
3772 UNSUPPORTED_GC_OPTION(UseParallelGC);
3773 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3774 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3775 UNSUPPORTED_GC_OPTION(UseParNewGC);
3776 }
3777 #endif // INCLUDE_ALL_GCS
3778
3779 // Sharing support
3780 // Construct the path to the archive
3781 static char* get_shared_archive_path() {
3782 char *shared_archive_path;
3783 if (SharedArchiveFile == NULL) {
3784 char jvm_path[JVM_MAXPATHLEN];
3785 os::jvm_path(jvm_path, sizeof(jvm_path));
3786 char *end = strrchr(jvm_path, *os::file_separator());
3787 if (end != NULL) *end = '\0';
3788 size_t jvm_path_len = strlen(jvm_path);
3789 size_t file_sep_len = strlen(os::file_separator());
3790 const size_t len = jvm_path_len + file_sep_len + 20;
3791 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3792 if (shared_archive_path != NULL) {
3793 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3794 jvm_path, os::file_separator());
3795 }
3796 } else {
3797 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3798 }
3799 return shared_archive_path;
3800 }
3801
3802 #ifndef PRODUCT
3803 // Determine whether LogVMOutput should be implicitly turned on.
3804 static bool use_vm_log() {
3805 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3806 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3807 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3808 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3809 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3810 return true;
3811 }
3812
3813 #ifdef COMPILER1
3814 if (PrintC1Statistics) {
3815 return true;
3816 }
3817 #endif // COMPILER1
3818
3819 #ifdef COMPILER2
3820 if (PrintOptoAssembly || PrintOptoStatistics) {
3821 return true;
3822 }
3823 #endif // COMPILER2
3824
3825 return false;
3826 }
3827
3828 #endif // PRODUCT
3829
3830 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3831 for (int index = 0; index < args->nOptions; index++) {
3832 const JavaVMOption* option = args->options + index;
3833 const char* tail;
3834 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3835 return true;
3836 }
3837 }
3838 return false;
3839 }
3840
3841 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3842 const char* vm_options_file,
3843 const int vm_options_file_pos,
3844 ScopedVMInitArgs* vm_options_file_args,
3845 ScopedVMInitArgs* args_out) {
3846 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3847 if (code != JNI_OK) {
3848 return code;
3849 }
3850
3851 if (vm_options_file_args->get()->nOptions < 1) {
3852 return JNI_OK;
3853 }
3854
3855 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3856 jio_fprintf(defaultStream::error_stream(),
3857 "A VM options file may not refer to a VM options file. "
3858 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3859 "options file '%s' in options container '%s' is an error.\n",
3860 vm_options_file_args->vm_options_file_arg(),
3861 vm_options_file_args->container_name());
3862 return JNI_EINVAL;
3863 }
3864
3865 return args_out->insert(args, vm_options_file_args->get(),
3866 vm_options_file_pos);
3867 }
3868
3869 // Expand -XX:VMOptionsFile found in args_in as needed.
3870 // mod_args and args_out parameters may return values as needed.
3871 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3872 ScopedVMInitArgs* mod_args,
3873 JavaVMInitArgs** args_out) {
3874 jint code = match_special_option_and_act(args_in, mod_args);
3875 if (code != JNI_OK) {
3876 return code;
3877 }
3878
3879 if (mod_args->is_set()) {
3880 // args_in contains -XX:VMOptionsFile and mod_args contains the
3881 // original options from args_in along with the options expanded
3882 // from the VMOptionsFile. Return a short-hand to the caller.
3883 *args_out = mod_args->get();
3884 } else {
3885 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3886 }
3887 return JNI_OK;
3888 }
3889
3890 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3891 ScopedVMInitArgs* args_out) {
3892 // Remaining part of option string
3893 const char* tail;
3894 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3895
3896 for (int index = 0; index < args->nOptions; index++) {
3897 const JavaVMOption* option = args->options + index;
3898 if (ArgumentsExt::process_options(option)) {
3899 continue;
3900 }
3901 if (match_option(option, "-XX:Flags=", &tail)) {
3902 Arguments::set_jvm_flags_file(tail);
3903 continue;
3904 }
3905 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3906 if (vm_options_file_args.found_vm_options_file_arg()) {
3907 jio_fprintf(defaultStream::error_stream(),
3908 "The option '%s' is already specified in the options "
3909 "container '%s' so the specification of '%s' in the "
3910 "same options container is an error.\n",
3911 vm_options_file_args.vm_options_file_arg(),
3912 vm_options_file_args.container_name(),
3913 option->optionString);
3914 return JNI_EINVAL;
3915 }
3916 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3917 // If there's a VMOptionsFile, parse that
3918 jint code = insert_vm_options_file(args, tail, index,
3919 &vm_options_file_args, args_out);
3920 if (code != JNI_OK) {
3921 return code;
3922 }
3923 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3924 if (args_out->is_set()) {
3925 // The VMOptions file inserted some options so switch 'args'
3926 // to the new set of options, and continue processing which
3927 // preserves "last option wins" semantics.
3928 args = args_out->get();
3929 // The first option from the VMOptionsFile replaces the
3930 // current option. So we back track to process the
3931 // replacement option.
3932 index--;
3933 }
3934 continue;
3935 }
3936 if (match_option(option, "-XX:+PrintVMOptions")) {
3937 PrintVMOptions = true;
3938 continue;
3939 }
3940 if (match_option(option, "-XX:-PrintVMOptions")) {
3941 PrintVMOptions = false;
3942 continue;
3943 }
3944 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3945 IgnoreUnrecognizedVMOptions = true;
3946 continue;
3947 }
3948 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3949 IgnoreUnrecognizedVMOptions = false;
3950 continue;
3951 }
3952 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3953 CommandLineFlags::printFlags(tty, false);
3954 vm_exit(0);
3955 }
3956 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3957 #if INCLUDE_NMT
3958 // The launcher did not setup nmt environment variable properly.
3959 if (!MemTracker::check_launcher_nmt_support(tail)) {
3960 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3961 }
3962
3963 // Verify if nmt option is valid.
3964 if (MemTracker::verify_nmt_option()) {
3965 // Late initialization, still in single-threaded mode.
3966 if (MemTracker::tracking_level() >= NMT_summary) {
3967 MemTracker::init();
3968 }
3969 } else {
3970 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3971 }
3972 continue;
3973 #else
3974 jio_fprintf(defaultStream::error_stream(),
3975 "Native Memory Tracking is not supported in this VM\n");
3976 return JNI_ERR;
3977 #endif
3978 }
3979
3980 #ifndef PRODUCT
3981 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3982 CommandLineFlags::printFlags(tty, true);
3983 vm_exit(0);
3984 }
3985 #endif
3986 }
3987 return JNI_OK;
3988 }
3989
3990 static void print_options(const JavaVMInitArgs *args) {
3991 const char* tail;
3992 for (int index = 0; index < args->nOptions; index++) {
3993 const JavaVMOption *option = args->options + index;
3994 if (match_option(option, "-XX:", &tail)) {
3995 logOption(tail);
3996 }
3997 }
3998 }
3999
4000 // Parse entry point called from JNI_CreateJavaVM
4001
4002 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4003 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4004
4005 // Initialize ranges and constraints
4006 CommandLineFlagRangeList::init();
4007 CommandLineFlagConstraintList::init();
4008
4009 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4010 const char* hotspotrc = ".hotspotrc";
4011 bool settings_file_specified = false;
4012 bool needs_hotspotrc_warning = false;
4013 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4014 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4015
4016 // Pointers to current working set of containers
4017 JavaVMInitArgs* cur_cmd_args;
4018 JavaVMInitArgs* cur_java_options_args;
4019 JavaVMInitArgs* cur_java_tool_options_args;
4020
4021 // Containers for modified/expanded options
4022 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4023 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4024 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4025
4026
4027 jint code =
4028 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4029 if (code != JNI_OK) {
4030 return code;
4031 }
4032
4033 code = parse_java_options_environment_variable(&initial_java_options_args);
4034 if (code != JNI_OK) {
4035 return code;
4036 }
4037
4038 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4039 &mod_java_tool_options_args,
4040 &cur_java_tool_options_args);
4041 if (code != JNI_OK) {
4042 return code;
4043 }
4044
4045 code = expand_vm_options_as_needed(initial_cmd_args,
4046 &mod_cmd_args,
4047 &cur_cmd_args);
4048 if (code != JNI_OK) {
4049 return code;
4050 }
4051
4052 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4053 &mod_java_options_args,
4054 &cur_java_options_args);
4055 if (code != JNI_OK) {
4056 return code;
4057 }
4058
4059 const char* flags_file = Arguments::get_jvm_flags_file();
4060 settings_file_specified = (flags_file != NULL);
4061
4062 if (IgnoreUnrecognizedVMOptions) {
4063 cur_cmd_args->ignoreUnrecognized = true;
4064 cur_java_tool_options_args->ignoreUnrecognized = true;
4065 cur_java_options_args->ignoreUnrecognized = true;
4066 }
4067
4068 // Parse specified settings file
4069 if (settings_file_specified) {
4070 if (!process_settings_file(flags_file, true,
4071 cur_cmd_args->ignoreUnrecognized)) {
4072 return JNI_EINVAL;
4073 }
4074 } else {
4075 #ifdef ASSERT
4076 // Parse default .hotspotrc settings file
4077 if (!process_settings_file(".hotspotrc", false,
4078 cur_cmd_args->ignoreUnrecognized)) {
4079 return JNI_EINVAL;
4080 }
4081 #else
4082 struct stat buf;
4083 if (os::stat(hotspotrc, &buf) == 0) {
4084 needs_hotspotrc_warning = true;
4085 }
4086 #endif
4087 }
4088
4089 if (PrintVMOptions) {
4090 print_options(cur_java_tool_options_args);
4091 print_options(cur_cmd_args);
4092 print_options(cur_java_options_args);
4093 }
4094
4095 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4096 jint result = parse_vm_init_args(cur_java_tool_options_args,
4097 cur_java_options_args,
4098 cur_cmd_args);
4099
4100 if (result != JNI_OK) {
4101 return result;
4102 }
4103
4104 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4105 SharedArchivePath = get_shared_archive_path();
4106 if (SharedArchivePath == NULL) {
4107 return JNI_ENOMEM;
4108 }
4109
4110 // Set up VerifySharedSpaces
4111 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4112 VerifySharedSpaces = true;
4113 }
4114
4115 // Delay warning until here so that we've had a chance to process
4116 // the -XX:-PrintWarnings flag
4117 if (needs_hotspotrc_warning) {
4118 warning("%s file is present but has been ignored. "
4119 "Run with -XX:Flags=%s to load the file.",
4120 hotspotrc, hotspotrc);
4121 }
4122
4123 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4124 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4125 #endif
4126
4127 ArgumentsExt::report_unsupported_options();
4128
4129 #ifndef PRODUCT
4130 if (TraceBytecodesAt != 0) {
4131 TraceBytecodes = true;
4132 }
4133 if (CountCompiledCalls) {
4134 if (UseCounterDecay) {
4135 warning("UseCounterDecay disabled because CountCalls is set");
4136 UseCounterDecay = false;
4137 }
4138 }
4139 #endif // PRODUCT
4140
4141 if (ScavengeRootsInCode == 0) {
4142 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4143 warning("Forcing ScavengeRootsInCode non-zero");
4144 }
4145 ScavengeRootsInCode = 1;
4146 }
4147
4148 // Set object alignment values.
4149 set_object_alignment();
4150
4151 #if !INCLUDE_ALL_GCS
4152 force_serial_gc();
4153 #endif // INCLUDE_ALL_GCS
4154 #if !INCLUDE_CDS
4155 if (DumpSharedSpaces || RequireSharedSpaces) {
4156 jio_fprintf(defaultStream::error_stream(),
4157 "Shared spaces are not supported in this VM\n");
4158 return JNI_ERR;
4159 }
4160 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4161 warning("Shared spaces are not supported in this VM");
4162 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4163 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4164 }
4165 no_shared_spaces("CDS Disabled");
4166 #endif // INCLUDE_CDS
4167
4168 return JNI_OK;
4169 }
4170
4171 jint Arguments::apply_ergo() {
4172
4173 // Set flags based on ergonomics.
4174 set_ergonomics_flags();
4175
4176 set_shared_spaces_flags();
4177
4178 // Check the GC selections again.
4179 if (!check_gc_consistency()) {
4180 return JNI_EINVAL;
4181 }
4182
4183 if (TieredCompilation) {
4184 set_tiered_flags();
4185 } else {
4186 int max_compilation_policy_choice = 1;
4187 #ifdef COMPILER2
4188 max_compilation_policy_choice = 2;
4189 #endif
4190 // Check if the policy is valid.
4191 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4192 vm_exit_during_initialization(
4193 "Incompatible compilation policy selected", NULL);
4194 }
4195 // Scale CompileThreshold
4196 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4197 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4198 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4199 }
4200 }
4201
4202 #ifdef COMPILER2
4203 #ifndef PRODUCT
4204 if (PrintIdealGraphLevel > 0) {
4205 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4206 }
4207 #endif
4208 #endif
4209
4210 // Set heap size based on available physical memory
4211 set_heap_size();
4212
4213 ArgumentsExt::set_gc_specific_flags();
4214
4215 // Initialize Metaspace flags and alignments
4216 Metaspace::ergo_initialize();
4217
4218 // Set bytecode rewriting flags
4219 set_bytecode_flags();
4220
4221 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4222 jint code = set_aggressive_opts_flags();
4223 if (code != JNI_OK) {
4224 return code;
4225 }
4226
4227 // Turn off biased locking for locking debug mode flags,
4228 // which are subtly different from each other but neither works with
4229 // biased locking
4230 if (UseHeavyMonitors
4231 #ifdef COMPILER1
4232 || !UseFastLocking
4233 #endif // COMPILER1
4234 #if INCLUDE_JVMCI
4235 || !JVMCIUseFastLocking
4236 #endif
4237 ) {
4238 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4239 // flag set to true on command line; warn the user that they
4240 // can't enable biased locking here
4241 warning("Biased Locking is not supported with locking debug flags"
4242 "; ignoring UseBiasedLocking flag." );
4243 }
4244 UseBiasedLocking = false;
4245 }
4246
4247 #ifdef CC_INTERP
4248 // Clear flags not supported on zero.
4249 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4250 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4251 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4252 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4253 #endif // CC_INTERP
4254
4255 #ifdef COMPILER2
4256 if (!EliminateLocks) {
4257 EliminateNestedLocks = false;
4258 }
4259 if (!Inline) {
4260 IncrementalInline = false;
4261 }
4262 #ifndef PRODUCT
4263 if (!IncrementalInline) {
4264 AlwaysIncrementalInline = false;
4265 }
4266 #endif
4267 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4268 // nothing to use the profiling, turn if off
4269 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4270 }
4271 #endif
4272
4273 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4274 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4275 DebugNonSafepoints = true;
4276 }
4277
4278 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4279 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4280 }
4281
4282 #ifndef PRODUCT
4283 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4284 if (use_vm_log()) {
4285 LogVMOutput = true;
4286 }
4287 }
4288 #endif // PRODUCT
4289
4290 if (PrintCommandLineFlags) {
4291 CommandLineFlags::printSetFlags(tty);
4292 }
4293
4294 // Apply CPU specific policy for the BiasedLocking
4295 if (UseBiasedLocking) {
4296 if (!VM_Version::use_biased_locking() &&
4297 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4298 UseBiasedLocking = false;
4299 }
4300 }
4301 #ifdef COMPILER2
4302 if (!UseBiasedLocking || EmitSync != 0) {
4303 UseOptoBiasInlining = false;
4304 }
4305 #endif
4306
4307 return JNI_OK;
4308 }
4309
4310 jint Arguments::adjust_after_os() {
4311 if (UseNUMA) {
4312 if (UseParallelGC || UseParallelOldGC) {
4313 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4314 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4315 }
4316 }
4317 // UseNUMAInterleaving is set to ON for all collectors and
4318 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4319 // such as the parallel collector for Linux and Solaris will
4320 // interleave old gen and survivor spaces on top of NUMA
4321 // allocation policy for the eden space.
4322 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4323 // all platforms and ParallelGC on Windows will interleave all
4324 // of the heap spaces across NUMA nodes.
4325 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4326 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4327 }
4328 }
4329 return JNI_OK;
4330 }
4331
4332 int Arguments::PropertyList_count(SystemProperty* pl) {
4333 int count = 0;
4334 while(pl != NULL) {
4335 count++;
4336 pl = pl->next();
4337 }
4338 return count;
4339 }
4340
4341 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4342 assert(key != NULL, "just checking");
4343 SystemProperty* prop;
4344 for (prop = pl; prop != NULL; prop = prop->next()) {
4345 if (strcmp(key, prop->key()) == 0) return prop->value();
4346 }
4347 return NULL;
4348 }
4349
4350 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4351 int count = 0;
4352 const char* ret_val = NULL;
4353
4354 while(pl != NULL) {
4355 if(count >= index) {
4356 ret_val = pl->key();
4357 break;
4358 }
4359 count++;
4360 pl = pl->next();
4361 }
4362
4363 return ret_val;
4364 }
4365
4366 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4367 int count = 0;
4368 char* ret_val = NULL;
4369
4370 while(pl != NULL) {
4371 if(count >= index) {
4372 ret_val = pl->value();
4373 break;
4374 }
4375 count++;
4376 pl = pl->next();
4377 }
4378
4379 return ret_val;
4380 }
4381
4382 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4383 SystemProperty* p = *plist;
4384 if (p == NULL) {
4385 *plist = new_p;
4386 } else {
4387 while (p->next() != NULL) {
4388 p = p->next();
4389 }
4390 p->set_next(new_p);
4391 }
4392 }
4393
4394 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4395 if (plist == NULL)
4396 return;
4397
4398 SystemProperty* new_p = new SystemProperty(k, v, true);
4399 PropertyList_add(plist, new_p);
4400 }
4401
4402 void Arguments::PropertyList_add(SystemProperty *element) {
4403 PropertyList_add(&_system_properties, element);
4404 }
4405
4406 // This add maintains unique property key in the list.
4407 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4408 if (plist == NULL)
4409 return;
4410
4411 // If property key exist then update with new value.
4412 SystemProperty* prop;
4413 for (prop = *plist; prop != NULL; prop = prop->next()) {
4414 if (strcmp(k, prop->key()) == 0) {
4415 if (append) {
4416 prop->append_value(v);
4417 } else {
4418 prop->set_value(v);
4419 }
4420 return;
4421 }
4422 }
4423
4424 PropertyList_add(plist, k, v);
4425 }
4426
4427 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4428 // Returns true if all of the source pointed by src has been copied over to
4429 // the destination buffer pointed by buf. Otherwise, returns false.
4430 // Notes:
4431 // 1. If the length (buflen) of the destination buffer excluding the
4432 // NULL terminator character is not long enough for holding the expanded
4433 // pid characters, it also returns false instead of returning the partially
4434 // expanded one.
4435 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4436 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4437 char* buf, size_t buflen) {
4438 const char* p = src;
4439 char* b = buf;
4440 const char* src_end = &src[srclen];
4441 char* buf_end = &buf[buflen - 1];
4442
4443 while (p < src_end && b < buf_end) {
4444 if (*p == '%') {
4445 switch (*(++p)) {
4446 case '%': // "%%" ==> "%"
4447 *b++ = *p++;
4448 break;
4449 case 'p': { // "%p" ==> current process id
4450 // buf_end points to the character before the last character so
4451 // that we could write '\0' to the end of the buffer.
4452 size_t buf_sz = buf_end - b + 1;
4453 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4454
4455 // if jio_snprintf fails or the buffer is not long enough to hold
4456 // the expanded pid, returns false.
4457 if (ret < 0 || ret >= (int)buf_sz) {
4458 return false;
4459 } else {
4460 b += ret;
4461 assert(*b == '\0', "fail in copy_expand_pid");
4462 if (p == src_end && b == buf_end + 1) {
4463 // reach the end of the buffer.
4464 return true;
4465 }
4466 }
4467 p++;
4468 break;
4469 }
4470 default :
4471 *b++ = '%';
4472 }
4473 } else {
4474 *b++ = *p++;
4475 }
4476 }
4477 *b = '\0';
4478 return (p == src_end); // return false if not all of the source was copied
4479 }