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