1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "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:+TraceMonitorInflation", "-Xlog:monitorinflation=debug" },
404 { "-XX:-TraceMonitorInflation", "-Xlog:monitorinflation=off" },
405 { NULL, NULL }
406 };
407
408 // Return true if "v" is less than "other", where "other" may be "undefined".
409 static bool version_less_than(JDK_Version v, JDK_Version other) {
410 assert(!v.is_undefined(), "must be defined");
411 if (!other.is_undefined() && v.compare(other) >= 0) {
412 return false;
413 } else {
414 return true;
415 }
416 }
417
418 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
419 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
420 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
421 flag = special_jvm_flags[i];
422 return true;
423 }
424 }
425 return false;
426 }
427
428 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
429 assert(version != NULL, "Must provide a version buffer");
430 SpecialFlag flag;
431 if (lookup_special_flag(flag_name, flag)) {
432 if (!flag.obsolete_in.is_undefined()) {
433 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
434 *version = flag.obsolete_in;
435 return true;
436 }
437 }
438 }
439 return false;
440 }
441
442 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
443 assert(version != NULL, "Must provide a version buffer");
444 SpecialFlag flag;
445 if (lookup_special_flag(flag_name, flag)) {
446 if (!flag.deprecated_in.is_undefined()) {
447 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
448 version_less_than(JDK_Version::current(), flag.expired_in)) {
449 *version = flag.deprecated_in;
450 return 1;
451 } else {
452 return -1;
453 }
454 }
455 }
456 return 0;
457 }
458
459 const char* Arguments::real_flag_name(const char *flag_name) {
460 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
461 const AliasedFlag& flag_status = aliased_jvm_flags[i];
462 if (strcmp(flag_status.alias_name, flag_name) == 0) {
463 return flag_status.real_name;
464 }
465 }
466 return flag_name;
467 }
468
469 #ifdef ASSERT
470 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
471 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
472 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
473 return true;
474 }
475 }
476 return false;
477 }
478
479 static bool verify_special_jvm_flags() {
480 bool success = true;
481 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
482 const SpecialFlag& flag = special_jvm_flags[i];
483 if (lookup_special_flag(flag.name, i)) {
484 warning("Duplicate special flag declaration \"%s\"", flag.name);
485 success = false;
486 }
487 if (flag.deprecated_in.is_undefined() &&
488 flag.obsolete_in.is_undefined()) {
489 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
490 success = false;
491 }
492
493 if (!flag.deprecated_in.is_undefined()) {
494 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
495 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
496 success = false;
497 }
498
499 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
500 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
501 success = false;
502 }
503 }
504
505 if (!flag.obsolete_in.is_undefined()) {
506 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
507 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
508 success = false;
509 }
510
511 // if flag has become obsolete it should not have a "globals" flag defined anymore.
512 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
513 if (Flag::find_flag(flag.name) != NULL) {
514 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
515 success = false;
516 }
517 }
518 }
519
520 if (!flag.expired_in.is_undefined()) {
521 // if flag has become expired it should not have a "globals" flag defined anymore.
522 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
523 if (Flag::find_flag(flag.name) != NULL) {
524 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
525 success = false;
526 }
527 }
528 }
529
530 }
531 return success;
532 }
533 #endif
534
535 // Constructs the system class path (aka boot class path) from the following
536 // components, in order:
537 //
538 // prefix // from -Xbootclasspath/p:...
539 // base // from os::get_system_properties() or -Xbootclasspath=
540 // suffix // from -Xbootclasspath/a:...
541 //
542 // This could be AllStatic, but it isn't needed after argument processing is
543 // complete.
544 class SysClassPath: public StackObj {
545 public:
546 SysClassPath(const char* base);
547 ~SysClassPath();
548
549 inline void set_base(const char* base);
550 inline void add_prefix(const char* prefix);
551 inline void add_suffix_to_prefix(const char* suffix);
552 inline void add_suffix(const char* suffix);
553 inline void reset_path(const char* base);
554
555 inline const char* get_base() const { return _items[_scp_base]; }
556 inline const char* get_prefix() const { return _items[_scp_prefix]; }
557 inline const char* get_suffix() const { return _items[_scp_suffix]; }
558
559 // Combine all the components into a single c-heap-allocated string; caller
560 // must free the string if/when no longer needed.
561 char* combined_path();
562
563 private:
564 // Utility routines.
565 static char* add_to_path(const char* path, const char* str, bool prepend);
566 static char* add_jars_to_path(char* path, const char* directory);
567
568 inline void reset_item_at(int index);
569
570 // Array indices for the items that make up the sysclasspath. All except the
571 // base are allocated in the C heap and freed by this class.
572 enum {
573 _scp_prefix, // from -Xbootclasspath/p:...
574 _scp_base, // the default sysclasspath
575 _scp_suffix, // from -Xbootclasspath/a:...
576 _scp_nitems // the number of items, must be last.
577 };
578
579 const char* _items[_scp_nitems];
580 };
581
582 SysClassPath::SysClassPath(const char* base) {
583 memset(_items, 0, sizeof(_items));
584 _items[_scp_base] = base;
585 }
586
587 SysClassPath::~SysClassPath() {
588 // Free everything except the base.
589 for (int i = 0; i < _scp_nitems; ++i) {
590 if (i != _scp_base) reset_item_at(i);
591 }
592 }
593
594 inline void SysClassPath::set_base(const char* base) {
595 _items[_scp_base] = base;
596 }
597
598 inline void SysClassPath::add_prefix(const char* prefix) {
599 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
600 }
601
602 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
603 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
604 }
605
606 inline void SysClassPath::add_suffix(const char* suffix) {
607 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
608 }
609
610 inline void SysClassPath::reset_item_at(int index) {
611 assert(index < _scp_nitems && index != _scp_base, "just checking");
612 if (_items[index] != NULL) {
613 FREE_C_HEAP_ARRAY(char, _items[index]);
614 _items[index] = NULL;
615 }
616 }
617
618 inline void SysClassPath::reset_path(const char* base) {
619 // Clear the prefix and suffix.
620 reset_item_at(_scp_prefix);
621 reset_item_at(_scp_suffix);
622 set_base(base);
623 }
624
625 //------------------------------------------------------------------------------
626
627
628 // Combine the bootclasspath elements, some of which may be null, into a single
629 // c-heap-allocated string.
630 char* SysClassPath::combined_path() {
631 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
632
633 size_t lengths[_scp_nitems];
634 size_t total_len = 0;
635
636 const char separator = *os::path_separator();
637
638 // Get the lengths.
639 int i;
640 for (i = 0; i < _scp_nitems; ++i) {
641 if (_items[i] != NULL) {
642 lengths[i] = strlen(_items[i]);
643 // Include space for the separator char (or a NULL for the last item).
644 total_len += lengths[i] + 1;
645 }
646 }
647 assert(total_len > 0, "empty sysclasspath not allowed");
648
649 // Copy the _items to a single string.
650 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
651 char* cp_tmp = cp;
652 for (i = 0; i < _scp_nitems; ++i) {
653 if (_items[i] != NULL) {
654 memcpy(cp_tmp, _items[i], lengths[i]);
655 cp_tmp += lengths[i];
656 *cp_tmp++ = separator;
657 }
658 }
659 *--cp_tmp = '\0'; // Replace the extra separator.
660 return cp;
661 }
662
663 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
664 char*
665 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
666 char *cp;
667
668 assert(str != NULL, "just checking");
669 if (path == NULL) {
670 size_t len = strlen(str) + 1;
671 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
672 memcpy(cp, str, len); // copy the trailing null
673 } else {
674 const char separator = *os::path_separator();
675 size_t old_len = strlen(path);
676 size_t str_len = strlen(str);
677 size_t len = old_len + str_len + 2;
678
679 if (prepend) {
680 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
681 char* cp_tmp = cp;
682 memcpy(cp_tmp, str, str_len);
683 cp_tmp += str_len;
684 *cp_tmp = separator;
685 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
686 FREE_C_HEAP_ARRAY(char, path);
687 } else {
688 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
689 char* cp_tmp = cp + old_len;
690 *cp_tmp = separator;
691 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
692 }
693 }
694 return cp;
695 }
696
697 // Scan the directory and append any jar or zip files found to path.
698 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
699 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
700 DIR* dir = os::opendir(directory);
701 if (dir == NULL) return path;
702
703 char dir_sep[2] = { '\0', '\0' };
704 size_t directory_len = strlen(directory);
705 const char fileSep = *os::file_separator();
706 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
707
708 /* Scan the directory for jars/zips, appending them to path. */
709 struct dirent *entry;
710 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
711 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
712 const char* name = entry->d_name;
713 const char* ext = name + strlen(name) - 4;
714 bool isJarOrZip = ext > name &&
715 (os::file_name_strcmp(ext, ".jar") == 0 ||
716 os::file_name_strcmp(ext, ".zip") == 0);
717 if (isJarOrZip) {
718 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
719 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
720 path = add_to_path(path, jarpath, false);
721 FREE_C_HEAP_ARRAY(char, jarpath);
722 }
723 }
724 FREE_C_HEAP_ARRAY(char, dbuf);
725 os::closedir(dir);
726 return path;
727 }
728
729 // Parses a memory size specification string.
730 static bool atomull(const char *s, julong* result) {
731 julong n = 0;
732 int args_read = 0;
733 bool is_hex = false;
734 // Skip leading 0[xX] for hexadecimal
735 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
736 s += 2;
737 is_hex = true;
738 args_read = sscanf(s, JULONG_FORMAT_X, &n);
739 } else {
740 args_read = sscanf(s, JULONG_FORMAT, &n);
741 }
742 if (args_read != 1) {
743 return false;
744 }
745 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
746 s++;
747 }
748 // 4705540: illegal if more characters are found after the first non-digit
749 if (strlen(s) > 1) {
750 return false;
751 }
752 switch (*s) {
753 case 'T': case 't':
754 *result = n * G * K;
755 // Check for overflow.
756 if (*result/((julong)G * K) != n) return false;
757 return true;
758 case 'G': case 'g':
759 *result = n * G;
760 if (*result/G != n) return false;
761 return true;
762 case 'M': case 'm':
763 *result = n * M;
764 if (*result/M != n) return false;
765 return true;
766 case 'K': case 'k':
767 *result = n * K;
768 if (*result/K != n) return false;
769 return true;
770 case '\0':
771 *result = n;
772 return true;
773 default:
774 return false;
775 }
776 }
777
778 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
779 if (size < min_size) return arg_too_small;
780 // Check that size will fit in a size_t (only relevant on 32-bit)
781 if (size > max_uintx) return arg_too_big;
782 return arg_in_range;
783 }
784
785 // Describe an argument out of range error
786 void Arguments::describe_range_error(ArgsRange errcode) {
787 switch(errcode) {
788 case arg_too_big:
789 jio_fprintf(defaultStream::error_stream(),
790 "The specified size exceeds the maximum "
791 "representable size.\n");
792 break;
793 case arg_too_small:
794 case arg_unreadable:
795 case arg_in_range:
796 // do nothing for now
797 break;
798 default:
799 ShouldNotReachHere();
800 }
801 }
802
803 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
804 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
805 return true;
806 } else {
807 return false;
808 }
809 }
810
811 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
812 char* end;
813 errno = 0;
814 double v = strtod(value, &end);
815 if ((errno != 0) || (*end != 0)) {
816 return false;
817 }
818
819 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
820 return true;
821 }
822 return false;
823 }
824
825 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
826 julong v;
827 int int_v;
828 intx intx_v;
829 bool is_neg = false;
830 Flag* result = Flag::find_flag(name, strlen(name));
831
832 if (result == NULL) {
833 return false;
834 }
835
836 // Check the sign first since atomull() parses only unsigned values.
837 if (*value == '-') {
838 if (!result->is_intx() && !result->is_int()) {
839 return false;
840 }
841 value++;
842 is_neg = true;
843 }
844 if (!atomull(value, &v)) {
845 return false;
846 }
847 if (result->is_int()) {
848 int_v = (int) v;
849 if (is_neg) {
850 int_v = -int_v;
851 }
852 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
853 } else if (result->is_uint()) {
854 uint uint_v = (uint) v;
855 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
856 } else if (result->is_intx()) {
857 intx_v = (intx) v;
858 if (is_neg) {
859 intx_v = -intx_v;
860 }
861 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
862 } else if (result->is_uintx()) {
863 uintx uintx_v = (uintx) v;
864 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
865 } else if (result->is_uint64_t()) {
866 uint64_t uint64_t_v = (uint64_t) v;
867 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
868 } else if (result->is_size_t()) {
869 size_t size_t_v = (size_t) v;
870 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
871 } else {
872 return false;
873 }
874 }
875
876 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
877 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
878 // Contract: CommandLineFlags always returns a pointer that needs freeing.
879 FREE_C_HEAP_ARRAY(char, value);
880 return true;
881 }
882
883 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
884 const char* old_value = "";
885 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
886 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
887 size_t new_len = strlen(new_value);
888 const char* value;
889 char* free_this_too = NULL;
890 if (old_len == 0) {
891 value = new_value;
892 } else if (new_len == 0) {
893 value = old_value;
894 } else {
895 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
896 // each new setting adds another LINE to the switch:
897 sprintf(buf, "%s\n%s", old_value, new_value);
898 value = buf;
899 free_this_too = buf;
900 }
901 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
902 // CommandLineFlags always returns a pointer that needs freeing.
903 FREE_C_HEAP_ARRAY(char, value);
904 if (free_this_too != NULL) {
905 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
906 FREE_C_HEAP_ARRAY(char, free_this_too);
907 }
908 return true;
909 }
910
911 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
912 const char* real_name = real_flag_name(arg);
913 JDK_Version since = JDK_Version();
914 switch (is_deprecated_flag(arg, &since)) {
915 case -1:
916 return NULL; // obsolete or expired, don't process normally
917 case 0:
918 return real_name;
919 case 1: {
920 if (warn) {
921 char version[256];
922 since.to_string(version, sizeof(version));
923 if (real_name != arg) {
924 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
925 arg, version, real_name);
926 } else {
927 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
928 arg, version);
929 }
930 }
931 return real_name;
932 }
933 }
934 ShouldNotReachHere();
935 return NULL;
936 }
937
938 // lookup_logging_aliases
939 // Called from parse_each_vm_init_arg(). Should be called on -XX options before specific cases are checked.
940 // If arg matches any aliased_jvm_logging_flags entry, look up the real name and copy it into buffer.
941 bool Arguments::lookup_logging_aliases(const char* arg, char* buffer) {
942 for (size_t i = 0; aliased_jvm_logging_flags[i].alias_name != NULL; i++) {
943 const AliasedFlag& flag_status = aliased_jvm_logging_flags[i];
944 if (strcmp(flag_status.alias_name, arg) == 0) {
945 strcpy(buffer, flag_status.real_name);
946 return true;
947 }
948 }
949 return false;
950 }
951
952 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
953
954 // range of acceptable characters spelled out for portability reasons
955 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
956 #define BUFLEN 255
957 char name[BUFLEN+1];
958 char dummy;
959 const char* real_name;
960 bool warn_if_deprecated = true;
961
962 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
963 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
964 if (real_name == NULL) {
965 return false;
966 }
967 return set_bool_flag(real_name, false, origin);
968 }
969 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
970 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
971 if (real_name == NULL) {
972 return false;
973 }
974 return set_bool_flag(real_name, true, origin);
975 }
976
977 char punct;
978 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
979 const char* value = strchr(arg, '=') + 1;
980 Flag* flag;
981
982 // this scanf pattern matches both strings (handled here) and numbers (handled later))
983 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
984 if (real_name == NULL) {
985 return false;
986 }
987 flag = Flag::find_flag(real_name);
988 if (flag != NULL && flag->is_ccstr()) {
989 if (flag->ccstr_accumulates()) {
990 return append_to_string_flag(real_name, value, origin);
991 } else {
992 if (value[0] == '\0') {
993 value = NULL;
994 }
995 return set_string_flag(real_name, value, origin);
996 }
997 } else {
998 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
999 }
1000 }
1001
1002 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1003 const char* value = strchr(arg, '=') + 1;
1004 // -XX:Foo:=xxx will reset the string flag to the given value.
1005 if (value[0] == '\0') {
1006 value = NULL;
1007 }
1008 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1009 if (real_name == NULL) {
1010 return false;
1011 }
1012 return set_string_flag(real_name, value, origin);
1013 }
1014
1015 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1016 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1017 #define NUMBER_RANGE "[0123456789eE+-]"
1018 char value[BUFLEN + 1];
1019 char value2[BUFLEN + 1];
1020 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1021 // Looks like a floating-point number -- try again with more lenient format string
1022 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1023 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1024 if (real_name == NULL) {
1025 return false;
1026 }
1027 return set_fp_numeric_flag(real_name, value, origin);
1028 }
1029 }
1030
1031 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1032 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1033 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1034 if (real_name == NULL) {
1035 return false;
1036 }
1037 return set_numeric_flag(real_name, value, origin);
1038 }
1039
1040 return false;
1041 }
1042
1043 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1044 assert(bldarray != NULL, "illegal argument");
1045
1046 if (arg == NULL) {
1047 return;
1048 }
1049
1050 int new_count = *count + 1;
1051
1052 // expand the array and add arg to the last element
1053 if (*bldarray == NULL) {
1054 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1055 } else {
1056 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1057 }
1058 (*bldarray)[*count] = os::strdup_check_oom(arg);
1059 *count = new_count;
1060 }
1061
1062 void Arguments::build_jvm_args(const char* arg) {
1063 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1064 }
1065
1066 void Arguments::build_jvm_flags(const char* arg) {
1067 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1068 }
1069
1070 // utility function to return a string that concatenates all
1071 // strings in a given char** array
1072 const char* Arguments::build_resource_string(char** args, int count) {
1073 if (args == NULL || count == 0) {
1074 return NULL;
1075 }
1076 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1077 for (int i = 1; i < count; i++) {
1078 length += strlen(args[i]) + 1; // add 1 for a space
1079 }
1080 char* s = NEW_RESOURCE_ARRAY(char, length);
1081 strcpy(s, args[0]);
1082 for (int j = 1; j < count; j++) {
1083 strcat(s, " ");
1084 strcat(s, args[j]);
1085 }
1086 return (const char*) s;
1087 }
1088
1089 void Arguments::print_on(outputStream* st) {
1090 st->print_cr("VM Arguments:");
1091 if (num_jvm_flags() > 0) {
1092 st->print("jvm_flags: "); print_jvm_flags_on(st);
1093 st->cr();
1094 }
1095 if (num_jvm_args() > 0) {
1096 st->print("jvm_args: "); print_jvm_args_on(st);
1097 st->cr();
1098 }
1099 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1100 if (_java_class_path != NULL) {
1101 char* path = _java_class_path->value();
1102 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1103 }
1104 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1105 }
1106
1107 void Arguments::print_summary_on(outputStream* st) {
1108 // Print the command line. Environment variables that are helpful for
1109 // reproducing the problem are written later in the hs_err file.
1110 // flags are from setting file
1111 if (num_jvm_flags() > 0) {
1112 st->print_raw("Settings File: ");
1113 print_jvm_flags_on(st);
1114 st->cr();
1115 }
1116 // args are the command line and environment variable arguments.
1117 st->print_raw("Command Line: ");
1118 if (num_jvm_args() > 0) {
1119 print_jvm_args_on(st);
1120 }
1121 // this is the classfile and any arguments to the java program
1122 if (java_command() != NULL) {
1123 st->print("%s", java_command());
1124 }
1125 st->cr();
1126 }
1127
1128 void Arguments::print_jvm_flags_on(outputStream* st) {
1129 if (_num_jvm_flags > 0) {
1130 for (int i=0; i < _num_jvm_flags; i++) {
1131 st->print("%s ", _jvm_flags_array[i]);
1132 }
1133 }
1134 }
1135
1136 void Arguments::print_jvm_args_on(outputStream* st) {
1137 if (_num_jvm_args > 0) {
1138 for (int i=0; i < _num_jvm_args; i++) {
1139 st->print("%s ", _jvm_args_array[i]);
1140 }
1141 }
1142 }
1143
1144 bool Arguments::process_argument(const char* arg,
1145 jboolean ignore_unrecognized,
1146 Flag::Flags origin) {
1147 JDK_Version since = JDK_Version();
1148
1149 if (parse_argument(arg, origin)) {
1150 return true;
1151 }
1152
1153 // Determine if the flag has '+', '-', or '=' characters.
1154 bool has_plus_minus = (*arg == '+' || *arg == '-');
1155 const char* const argname = has_plus_minus ? arg + 1 : arg;
1156
1157 size_t arg_len;
1158 const char* equal_sign = strchr(argname, '=');
1159 if (equal_sign == NULL) {
1160 arg_len = strlen(argname);
1161 } else {
1162 arg_len = equal_sign - argname;
1163 }
1164
1165 // Only make the obsolete check for valid arguments.
1166 if (arg_len <= BUFLEN) {
1167 // Construct a string which consists only of the argument name without '+', '-', or '='.
1168 char stripped_argname[BUFLEN+1];
1169 strncpy(stripped_argname, argname, arg_len);
1170 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1171
1172 if (is_obsolete_flag(stripped_argname, &since)) {
1173 char version[256];
1174 since.to_string(version, sizeof(version));
1175 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1176 return true;
1177 }
1178 }
1179
1180 // For locked flags, report a custom error message if available.
1181 // Otherwise, report the standard unrecognized VM option.
1182 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1183 if (found_flag != NULL) {
1184 char locked_message_buf[BUFLEN];
1185 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1186 if (strlen(locked_message_buf) == 0) {
1187 if (found_flag->is_bool() && !has_plus_minus) {
1188 jio_fprintf(defaultStream::error_stream(),
1189 "Missing +/- setting for VM option '%s'\n", argname);
1190 } else if (!found_flag->is_bool() && has_plus_minus) {
1191 jio_fprintf(defaultStream::error_stream(),
1192 "Unexpected +/- setting in VM option '%s'\n", argname);
1193 } else {
1194 jio_fprintf(defaultStream::error_stream(),
1195 "Improperly specified VM option '%s'\n", argname);
1196 }
1197 } else {
1198 #ifdef PRODUCT
1199 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1200 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1201 if (ignore_unrecognized && mismatched) {
1202 return true;
1203 }
1204 #endif
1205 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1206 }
1207 } else {
1208 if (ignore_unrecognized) {
1209 return true;
1210 }
1211 jio_fprintf(defaultStream::error_stream(),
1212 "Unrecognized VM option '%s'\n", argname);
1213 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1214 if (fuzzy_matched != NULL) {
1215 jio_fprintf(defaultStream::error_stream(),
1216 "Did you mean '%s%s%s'? ",
1217 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1218 fuzzy_matched->_name,
1219 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1220 }
1221 }
1222
1223 // allow for commandline "commenting out" options like -XX:#+Verbose
1224 return arg[0] == '#';
1225 }
1226
1227 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1228 FILE* stream = fopen(file_name, "rb");
1229 if (stream == NULL) {
1230 if (should_exist) {
1231 jio_fprintf(defaultStream::error_stream(),
1232 "Could not open settings file %s\n", file_name);
1233 return false;
1234 } else {
1235 return true;
1236 }
1237 }
1238
1239 char token[1024];
1240 int pos = 0;
1241
1242 bool in_white_space = true;
1243 bool in_comment = false;
1244 bool in_quote = false;
1245 char quote_c = 0;
1246 bool result = true;
1247
1248 int c = getc(stream);
1249 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1250 if (in_white_space) {
1251 if (in_comment) {
1252 if (c == '\n') in_comment = false;
1253 } else {
1254 if (c == '#') in_comment = true;
1255 else if (!isspace(c)) {
1256 in_white_space = false;
1257 token[pos++] = c;
1258 }
1259 }
1260 } else {
1261 if (c == '\n' || (!in_quote && isspace(c))) {
1262 // token ends at newline, or at unquoted whitespace
1263 // this allows a way to include spaces in string-valued options
1264 token[pos] = '\0';
1265 logOption(token);
1266 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1267 build_jvm_flags(token);
1268 pos = 0;
1269 in_white_space = true;
1270 in_quote = false;
1271 } else if (!in_quote && (c == '\'' || c == '"')) {
1272 in_quote = true;
1273 quote_c = c;
1274 } else if (in_quote && (c == quote_c)) {
1275 in_quote = false;
1276 } else {
1277 token[pos++] = c;
1278 }
1279 }
1280 c = getc(stream);
1281 }
1282 if (pos > 0) {
1283 token[pos] = '\0';
1284 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1285 build_jvm_flags(token);
1286 }
1287 fclose(stream);
1288 return result;
1289 }
1290
1291 //=============================================================================================================
1292 // Parsing of properties (-D)
1293
1294 const char* Arguments::get_property(const char* key) {
1295 return PropertyList_get_value(system_properties(), key);
1296 }
1297
1298 bool Arguments::add_property(const char* prop) {
1299 const char* eq = strchr(prop, '=');
1300 const char* key;
1301 const char* value = "";
1302
1303 if (eq == NULL) {
1304 // property doesn't have a value, thus use passed string
1305 key = prop;
1306 } else {
1307 // property have a value, thus extract it and save to the
1308 // allocated string
1309 size_t key_len = eq - prop;
1310 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1311
1312 strncpy(tmp_key, prop, key_len);
1313 tmp_key[key_len] = '\0';
1314 key = tmp_key;
1315
1316 value = &prop[key_len + 1];
1317 }
1318
1319 if (strcmp(key, "java.compiler") == 0) {
1320 process_java_compiler_argument(value);
1321 // Record value in Arguments, but let it get passed to Java.
1322 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1323 strcmp(key, "sun.java.launcher.pid") == 0) {
1324 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1325 // private and are processed in process_sun_java_launcher_properties();
1326 // the sun.java.launcher property is passed on to the java application
1327 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1328 PropertyList_unique_add(&_system_properties, key, value, true);
1329 } else {
1330 if (strcmp(key, "sun.java.command") == 0) {
1331 char *old_java_command = _java_command;
1332 _java_command = os::strdup_check_oom(value, mtInternal);
1333 if (old_java_command != NULL) {
1334 os::free(old_java_command);
1335 }
1336 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1337 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1338 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1339 // its value without going through the property list or making a Java call.
1340 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1341 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1342 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1343 os::free((void *)old_java_vendor_url_bug);
1344 }
1345 }
1346
1347 // Create new property and add at the end of the list
1348 PropertyList_unique_add(&_system_properties, key, value);
1349 }
1350
1351 if (key != prop) {
1352 // SystemProperty copy passed value, thus free previously allocated
1353 // memory
1354 FreeHeap((void *)key);
1355 }
1356
1357 return true;
1358 }
1359
1360 //===========================================================================================================
1361 // Setting int/mixed/comp mode flags
1362
1363 void Arguments::set_mode_flags(Mode mode) {
1364 // Set up default values for all flags.
1365 // If you add a flag to any of the branches below,
1366 // add a default value for it here.
1367 set_java_compiler(false);
1368 _mode = mode;
1369
1370 // Ensure Agent_OnLoad has the correct initial values.
1371 // This may not be the final mode; mode may change later in onload phase.
1372 PropertyList_unique_add(&_system_properties, "java.vm.info",
1373 VM_Version::vm_info_string(), false);
1374
1375 UseInterpreter = true;
1376 UseCompiler = true;
1377 UseLoopCounter = true;
1378
1379 // Default values may be platform/compiler dependent -
1380 // use the saved values
1381 ClipInlining = Arguments::_ClipInlining;
1382 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1383 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1384 BackgroundCompilation = Arguments::_BackgroundCompilation;
1385 if (TieredCompilation) {
1386 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1387 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1388 }
1389 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1390 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1391 }
1392 }
1393
1394 // Change from defaults based on mode
1395 switch (mode) {
1396 default:
1397 ShouldNotReachHere();
1398 break;
1399 case _int:
1400 UseCompiler = false;
1401 UseLoopCounter = false;
1402 AlwaysCompileLoopMethods = false;
1403 UseOnStackReplacement = false;
1404 break;
1405 case _mixed:
1406 // same as default
1407 break;
1408 case _comp:
1409 UseInterpreter = false;
1410 BackgroundCompilation = false;
1411 ClipInlining = false;
1412 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1413 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1414 // compile a level 4 (C2) and then continue executing it.
1415 if (TieredCompilation) {
1416 Tier3InvokeNotifyFreqLog = 0;
1417 Tier4InvocationThreshold = 0;
1418 }
1419 break;
1420 }
1421 }
1422
1423 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1424 // Conflict: required to use shared spaces (-Xshare:on), but
1425 // incompatible command line options were chosen.
1426
1427 static void no_shared_spaces(const char* message) {
1428 if (RequireSharedSpaces) {
1429 jio_fprintf(defaultStream::error_stream(),
1430 "Class data sharing is inconsistent with other specified options.\n");
1431 vm_exit_during_initialization("Unable to use shared archive.", message);
1432 } else {
1433 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1434 }
1435 }
1436 #endif
1437
1438 // Returns threshold scaled with the value of scale.
1439 // If scale < 0.0, threshold is returned without scaling.
1440 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1441 if (scale == 1.0 || scale < 0.0) {
1442 return threshold;
1443 } else {
1444 return (intx)(threshold * scale);
1445 }
1446 }
1447
1448 // Returns freq_log scaled with the value of scale.
1449 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1450 // If scale < 0.0, freq_log is returned without scaling.
1451 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1452 // Check if scaling is necessary or if negative value was specified.
1453 if (scale == 1.0 || scale < 0.0) {
1454 return freq_log;
1455 }
1456 // Check values to avoid calculating log2 of 0.
1457 if (scale == 0.0 || freq_log == 0) {
1458 return 0;
1459 }
1460 // Determine the maximum notification frequency value currently supported.
1461 // The largest mask value that the interpreter/C1 can handle is
1462 // of length InvocationCounter::number_of_count_bits. Mask values are always
1463 // one bit shorter then the value of the notification frequency. Set
1464 // max_freq_bits accordingly.
1465 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1466 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1467 if (scaled_freq == 0) {
1468 // Return 0 right away to avoid calculating log2 of 0.
1469 return 0;
1470 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1471 return max_freq_bits;
1472 } else {
1473 return log2_intptr(scaled_freq);
1474 }
1475 }
1476
1477 void Arguments::set_tiered_flags() {
1478 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1479 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1480 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1481 }
1482 if (CompilationPolicyChoice < 2) {
1483 vm_exit_during_initialization(
1484 "Incompatible compilation policy selected", NULL);
1485 }
1486 // Increase the code cache size - tiered compiles a lot more.
1487 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1488 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1489 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1490 }
1491 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1492 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1493 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1494 }
1495 if (!UseInterpreter) { // -Xcomp
1496 Tier3InvokeNotifyFreqLog = 0;
1497 Tier4InvocationThreshold = 0;
1498 }
1499
1500 if (CompileThresholdScaling < 0) {
1501 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1502 }
1503
1504 // Scale tiered compilation thresholds.
1505 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1506 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1507 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1508 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1509
1510 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1511 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1512 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1513 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1514
1515 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1516 // once these thresholds become supported.
1517
1518 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1519 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1520
1521 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1522 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1523
1524 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1525
1526 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1527 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1528 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1529 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1530 }
1531 }
1532
1533 #if INCLUDE_ALL_GCS
1534 static void disable_adaptive_size_policy(const char* collector_name) {
1535 if (UseAdaptiveSizePolicy) {
1536 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1537 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1538 collector_name);
1539 }
1540 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1541 }
1542 }
1543
1544 void Arguments::set_parnew_gc_flags() {
1545 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1546 "control point invariant");
1547 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1548 assert(UseParNewGC, "ParNew should always be used with CMS");
1549
1550 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1551 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1552 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1553 } else if (ParallelGCThreads == 0) {
1554 jio_fprintf(defaultStream::error_stream(),
1555 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1556 vm_exit(1);
1557 }
1558
1559 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1560 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1561 // we set them to 1024 and 1024.
1562 // See CR 6362902.
1563 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1564 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1565 }
1566 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1567 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1568 }
1569
1570 // When using compressed oops, we use local overflow stacks,
1571 // rather than using a global overflow list chained through
1572 // the klass word of the object's pre-image.
1573 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1574 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1575 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1576 }
1577 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1578 }
1579 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1580 }
1581
1582 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1583 // sparc/solaris for certain applications, but would gain from
1584 // further optimization and tuning efforts, and would almost
1585 // certainly gain from analysis of platform and environment.
1586 void Arguments::set_cms_and_parnew_gc_flags() {
1587 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1588 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1589 assert(UseParNewGC, "ParNew should always be used with CMS");
1590
1591 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1592 disable_adaptive_size_policy("UseConcMarkSweepGC");
1593
1594 set_parnew_gc_flags();
1595
1596 size_t max_heap = align_size_down(MaxHeapSize,
1597 CardTableRS::ct_max_alignment_constraint());
1598
1599 // Now make adjustments for CMS
1600 intx tenuring_default = (intx)6;
1601 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1602
1603 // Preferred young gen size for "short" pauses:
1604 // upper bound depends on # of threads and NewRatio.
1605 const size_t preferred_max_new_size_unaligned =
1606 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1607 size_t preferred_max_new_size =
1608 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1609
1610 // Unless explicitly requested otherwise, size young gen
1611 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1612
1613 // If either MaxNewSize or NewRatio is set on the command line,
1614 // assume the user is trying to set the size of the young gen.
1615 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1616
1617 // Set MaxNewSize to our calculated preferred_max_new_size unless
1618 // NewSize was set on the command line and it is larger than
1619 // preferred_max_new_size.
1620 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1621 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1622 } else {
1623 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1624 }
1625 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1626
1627 // Code along this path potentially sets NewSize and OldSize
1628 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1629 min_heap_size(), InitialHeapSize, max_heap);
1630 size_t min_new = preferred_max_new_size;
1631 if (FLAG_IS_CMDLINE(NewSize)) {
1632 min_new = NewSize;
1633 }
1634 if (max_heap > min_new && min_heap_size() > min_new) {
1635 // Unless explicitly requested otherwise, make young gen
1636 // at least min_new, and at most preferred_max_new_size.
1637 if (FLAG_IS_DEFAULT(NewSize)) {
1638 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1639 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1640 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1641 }
1642 // Unless explicitly requested otherwise, size old gen
1643 // so it's NewRatio x of NewSize.
1644 if (FLAG_IS_DEFAULT(OldSize)) {
1645 if (max_heap > NewSize) {
1646 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1647 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1648 }
1649 }
1650 }
1651 }
1652 // Unless explicitly requested otherwise, definitely
1653 // promote all objects surviving "tenuring_default" scavenges.
1654 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1655 FLAG_IS_DEFAULT(SurvivorRatio)) {
1656 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1657 }
1658 // If we decided above (or user explicitly requested)
1659 // `promote all' (via MaxTenuringThreshold := 0),
1660 // prefer minuscule survivor spaces so as not to waste
1661 // space for (non-existent) survivors
1662 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1663 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1664 }
1665
1666 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1667 // but rather the number of free blocks of a given size that are used when
1668 // replenishing the local per-worker free list caches.
1669 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1670 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1671 // OldPLAB sizing manually turned off: Use a larger default setting,
1672 // unless it was manually specified. This is because a too-low value
1673 // will slow down scavenges.
1674 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1675 } else {
1676 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1677 }
1678 }
1679
1680 // If either of the static initialization defaults have changed, note this
1681 // modification.
1682 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1683 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1684 }
1685
1686 if (!ClassUnloading) {
1687 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1688 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1689 }
1690
1691 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1692 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1693 }
1694 #endif // INCLUDE_ALL_GCS
1695
1696 void set_object_alignment() {
1697 // Object alignment.
1698 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1699 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1700 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1701 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1702 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1703 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1704
1705 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1706 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1707
1708 // Oop encoding heap max
1709 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1710
1711 if (SurvivorAlignmentInBytes == 0) {
1712 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1713 }
1714
1715 #if INCLUDE_ALL_GCS
1716 // Set CMS global values
1717 CompactibleFreeListSpace::set_cms_values();
1718 #endif // INCLUDE_ALL_GCS
1719 }
1720
1721 size_t Arguments::max_heap_for_compressed_oops() {
1722 // Avoid sign flip.
1723 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1724 // We need to fit both the NULL page and the heap into the memory budget, while
1725 // keeping alignment constraints of the heap. To guarantee the latter, as the
1726 // NULL page is located before the heap, we pad the NULL page to the conservative
1727 // maximum alignment that the GC may ever impose upon the heap.
1728 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1729 _conservative_max_heap_alignment);
1730
1731 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1732 NOT_LP64(ShouldNotReachHere(); return 0);
1733 }
1734
1735 bool Arguments::should_auto_select_low_pause_collector() {
1736 if (UseAutoGCSelectPolicy &&
1737 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1738 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1739 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1740 return true;
1741 }
1742 return false;
1743 }
1744
1745 void Arguments::set_use_compressed_oops() {
1746 #ifndef ZERO
1747 #ifdef _LP64
1748 // MaxHeapSize is not set up properly at this point, but
1749 // the only value that can override MaxHeapSize if we are
1750 // to use UseCompressedOops is InitialHeapSize.
1751 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1752
1753 if (max_heap_size <= max_heap_for_compressed_oops()) {
1754 #if !defined(COMPILER1) || defined(TIERED)
1755 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1756 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1757 }
1758 #endif
1759 } else {
1760 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1761 warning("Max heap size too large for Compressed Oops");
1762 FLAG_SET_DEFAULT(UseCompressedOops, false);
1763 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1764 }
1765 }
1766 #endif // _LP64
1767 #endif // ZERO
1768 }
1769
1770
1771 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1772 // set_use_compressed_oops().
1773 void Arguments::set_use_compressed_klass_ptrs() {
1774 #ifndef ZERO
1775 #ifdef _LP64
1776 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1777 if (!UseCompressedOops) {
1778 if (UseCompressedClassPointers) {
1779 warning("UseCompressedClassPointers requires UseCompressedOops");
1780 }
1781 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1782 } else {
1783 // Turn on UseCompressedClassPointers too
1784 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1785 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1786 }
1787 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1788 if (UseCompressedClassPointers) {
1789 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1790 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1791 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1792 }
1793 }
1794 }
1795 #endif // _LP64
1796 #endif // !ZERO
1797 }
1798
1799 void Arguments::set_conservative_max_heap_alignment() {
1800 // The conservative maximum required alignment for the heap is the maximum of
1801 // the alignments imposed by several sources: any requirements from the heap
1802 // itself, the collector policy and the maximum page size we may run the VM
1803 // with.
1804 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1805 #if INCLUDE_ALL_GCS
1806 if (UseParallelGC) {
1807 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1808 } else if (UseG1GC) {
1809 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1810 }
1811 #endif // INCLUDE_ALL_GCS
1812 _conservative_max_heap_alignment = MAX4(heap_alignment,
1813 (size_t)os::vm_allocation_granularity(),
1814 os::max_page_size(),
1815 CollectorPolicy::compute_heap_alignment());
1816 }
1817
1818 void Arguments::select_gc_ergonomically() {
1819 if (os::is_server_class_machine()) {
1820 if (should_auto_select_low_pause_collector()) {
1821 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1822 } else {
1823 #if defined(JAVASE_EMBEDDED)
1824 FLAG_SET_ERGO(bool, UseParallelGC, true);
1825 #else
1826 FLAG_SET_ERGO(bool, UseG1GC, true);
1827 #endif
1828 }
1829 } else {
1830 FLAG_SET_ERGO(bool, UseSerialGC, true);
1831 }
1832 }
1833
1834 void Arguments::select_gc() {
1835 if (!gc_selected()) {
1836 select_gc_ergonomically();
1837 guarantee(gc_selected(), "No GC selected");
1838 }
1839 }
1840
1841 void Arguments::set_ergonomics_flags() {
1842 select_gc();
1843
1844 #if defined(COMPILER2) || INCLUDE_JVMCI
1845 // Shared spaces work fine with other GCs but causes bytecode rewriting
1846 // to be disabled, which hurts interpreter performance and decreases
1847 // server performance. When -server is specified, keep the default off
1848 // unless it is asked for. Future work: either add bytecode rewriting
1849 // at link time, or rewrite bytecodes in non-shared methods.
1850 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1851 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1852 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1853 }
1854 #endif
1855
1856 set_conservative_max_heap_alignment();
1857
1858 #ifndef ZERO
1859 #ifdef _LP64
1860 set_use_compressed_oops();
1861
1862 // set_use_compressed_klass_ptrs() must be called after calling
1863 // set_use_compressed_oops().
1864 set_use_compressed_klass_ptrs();
1865
1866 // Also checks that certain machines are slower with compressed oops
1867 // in vm_version initialization code.
1868 #endif // _LP64
1869 #endif // !ZERO
1870
1871 CodeCacheExtensions::set_ergonomics_flags();
1872 }
1873
1874 void Arguments::set_parallel_gc_flags() {
1875 assert(UseParallelGC || UseParallelOldGC, "Error");
1876 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1877 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1878 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1879 }
1880 FLAG_SET_DEFAULT(UseParallelGC, true);
1881
1882 // If no heap maximum was requested explicitly, use some reasonable fraction
1883 // of the physical memory, up to a maximum of 1GB.
1884 FLAG_SET_DEFAULT(ParallelGCThreads,
1885 Abstract_VM_Version::parallel_worker_threads());
1886 if (ParallelGCThreads == 0) {
1887 jio_fprintf(defaultStream::error_stream(),
1888 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1889 vm_exit(1);
1890 }
1891
1892 if (UseAdaptiveSizePolicy) {
1893 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1894 // unless the user actually sets these flags.
1895 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1896 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1897 }
1898 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1899 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1900 }
1901 }
1902
1903 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1904 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1905 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1906 // See CR 6362902 for details.
1907 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1908 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1909 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1910 }
1911 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1912 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1913 }
1914 }
1915
1916 if (UseParallelOldGC) {
1917 // Par compact uses lower default values since they are treated as
1918 // minimums. These are different defaults because of the different
1919 // interpretation and are not ergonomically set.
1920 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1921 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1922 }
1923 }
1924 }
1925
1926 void Arguments::set_g1_gc_flags() {
1927 assert(UseG1GC, "Error");
1928 #if defined(COMPILER1) || INCLUDE_JVMCI
1929 FastTLABRefill = false;
1930 #endif
1931 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1932 if (ParallelGCThreads == 0) {
1933 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1934 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1935 }
1936
1937 #if INCLUDE_ALL_GCS
1938 if (G1ConcRefinementThreads == 0) {
1939 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1940 }
1941 #endif
1942
1943 // MarkStackSize will be set (if it hasn't been set by the user)
1944 // when concurrent marking is initialized.
1945 // Its value will be based upon the number of parallel marking threads.
1946 // But we do set the maximum mark stack size here.
1947 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1948 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1949 }
1950
1951 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1952 // In G1, we want the default GC overhead goal to be higher than
1953 // it is for PS, or the heap might be expanded too aggressively.
1954 // We set it here to ~8%.
1955 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1956 }
1957
1958 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1959 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1960 }
1961
1962 #if !INCLUDE_ALL_GCS
1963 #ifdef ASSERT
1964 static bool verify_serial_gc_flags() {
1965 return (UseSerialGC &&
1966 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1967 UseParallelGC || UseParallelOldGC));
1968 }
1969 #endif // ASSERT
1970 #endif // INCLUDE_ALL_GCS
1971
1972 void Arguments::set_gc_specific_flags() {
1973 #if INCLUDE_ALL_GCS
1974 // Set per-collector flags
1975 if (UseParallelGC || UseParallelOldGC) {
1976 set_parallel_gc_flags();
1977 } else if (UseConcMarkSweepGC) {
1978 set_cms_and_parnew_gc_flags();
1979 } else if (UseG1GC) {
1980 set_g1_gc_flags();
1981 }
1982 if (AssumeMP && !UseSerialGC) {
1983 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1984 warning("If the number of processors is expected to increase from one, then"
1985 " you should configure the number of parallel GC threads appropriately"
1986 " using -XX:ParallelGCThreads=N");
1987 }
1988 }
1989 if (MinHeapFreeRatio == 100) {
1990 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1991 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1992 }
1993 #else // INCLUDE_ALL_GCS
1994 assert(verify_serial_gc_flags(), "SerialGC unset");
1995 #endif // INCLUDE_ALL_GCS
1996 }
1997
1998 julong Arguments::limit_by_allocatable_memory(julong limit) {
1999 julong max_allocatable;
2000 julong result = limit;
2001 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2002 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2003 }
2004 return result;
2005 }
2006
2007 // Use static initialization to get the default before parsing
2008 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2009
2010 void Arguments::set_heap_size() {
2011 const julong phys_mem =
2012 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2013 : (julong)MaxRAM;
2014
2015 // If the maximum heap size has not been set with -Xmx,
2016 // then set it as fraction of the size of physical memory,
2017 // respecting the maximum and minimum sizes of the heap.
2018 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2019 julong reasonable_max = phys_mem / MaxRAMFraction;
2020
2021 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2022 // Small physical memory, so use a minimum fraction of it for the heap
2023 reasonable_max = phys_mem / MinRAMFraction;
2024 } else {
2025 // Not-small physical memory, so require a heap at least
2026 // as large as MaxHeapSize
2027 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2028 }
2029 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2030 // Limit the heap size to ErgoHeapSizeLimit
2031 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2032 }
2033 if (UseCompressedOops) {
2034 // Limit the heap size to the maximum possible when using compressed oops
2035 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2036
2037 // HeapBaseMinAddress can be greater than default but not less than.
2038 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2039 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2040 // matches compressed oops printing flags
2041 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2042 jio_fprintf(defaultStream::error_stream(),
2043 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2044 " (" SIZE_FORMAT "G) which is greater than value given "
2045 SIZE_FORMAT "\n",
2046 DefaultHeapBaseMinAddress,
2047 DefaultHeapBaseMinAddress/G,
2048 HeapBaseMinAddress);
2049 }
2050 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2051 }
2052 }
2053
2054 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2055 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2056 // but it should be not less than default MaxHeapSize.
2057 max_coop_heap -= HeapBaseMinAddress;
2058 }
2059 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2060 }
2061 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2062
2063 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2064 // An initial heap size was specified on the command line,
2065 // so be sure that the maximum size is consistent. Done
2066 // after call to limit_by_allocatable_memory because that
2067 // method might reduce the allocation size.
2068 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2069 }
2070
2071 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2072 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2073 }
2074
2075 // If the minimum or initial heap_size have not been set or requested to be set
2076 // ergonomically, set them accordingly.
2077 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2078 julong reasonable_minimum = (julong)(OldSize + NewSize);
2079
2080 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2081
2082 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2083
2084 if (InitialHeapSize == 0) {
2085 julong reasonable_initial = phys_mem / InitialRAMFraction;
2086
2087 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2088 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2089
2090 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2091
2092 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2094 }
2095 // If the minimum heap size has not been set (via -Xms),
2096 // synchronize with InitialHeapSize to avoid errors with the default value.
2097 if (min_heap_size() == 0) {
2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2099 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2100 }
2101 }
2102 }
2103
2104 // This option inspects the machine and attempts to set various
2105 // parameters to be optimal for long-running, memory allocation
2106 // intensive jobs. It is intended for machines with large
2107 // amounts of cpu and memory.
2108 jint Arguments::set_aggressive_heap_flags() {
2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2110 // VM, but we may not be able to represent the total physical memory
2111 // available (like having 8gb of memory on a box but using a 32bit VM).
2112 // Thus, we need to make sure we're using a julong for intermediate
2113 // calculations.
2114 julong initHeapSize;
2115 julong total_memory = os::physical_memory();
2116
2117 if (total_memory < (julong) 256 * M) {
2118 jio_fprintf(defaultStream::error_stream(),
2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2120 vm_exit(1);
2121 }
2122
2123 // The heap size is half of available memory, or (at most)
2124 // all of possible memory less 160mb (leaving room for the OS
2125 // when using ISM). This is the maximum; because adaptive sizing
2126 // is turned on below, the actual space used may be smaller.
2127
2128 initHeapSize = MIN2(total_memory / (julong) 2,
2129 total_memory - (julong) 160 * M);
2130
2131 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2132
2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2134 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2135 return JNI_EINVAL;
2136 }
2137 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 // Currently the minimum size and the initial heap sizes are the same.
2141 set_min_heap_size(initHeapSize);
2142 }
2143 if (FLAG_IS_DEFAULT(NewSize)) {
2144 // Make the young generation 3/8ths of the total heap.
2145 if (FLAG_SET_CMDLINE(size_t, NewSize,
2146 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2147 return JNI_EINVAL;
2148 }
2149 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2150 return JNI_EINVAL;
2151 }
2152 }
2153
2154 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2155 FLAG_SET_DEFAULT(UseLargePages, true);
2156 #endif
2157
2158 // Increase some data structure sizes for efficiency
2159 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2166 return JNI_EINVAL;
2167 }
2168
2169 // See the OldPLABSize comment below, but replace 'after promotion'
2170 // with 'after copying'. YoungPLABSize is the size of the survivor
2171 // space per-gc-thread buffers. The default is 4kw.
2172 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2173 return JNI_EINVAL;
2174 }
2175
2176 // OldPLABSize is the size of the buffers in the old gen that
2177 // UseParallelGC uses to promote live data that doesn't fit in the
2178 // survivor spaces. At any given time, there's one for each gc thread.
2179 // The default size is 1kw. These buffers are rarely used, since the
2180 // survivor spaces are usually big enough. For specjbb, however, there
2181 // are occasions when there's lots of live data in the young gen
2182 // and we end up promoting some of it. We don't have a definite
2183 // explanation for why bumping OldPLABSize helps, but the theory
2184 // is that a bigger PLAB results in retaining something like the
2185 // original allocation order after promotion, which improves mutator
2186 // locality. A minor effect may be that larger PLABs reduce the
2187 // number of PLAB allocation events during gc. The value of 8kw
2188 // was arrived at by experimenting with specjbb.
2189 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2190 return JNI_EINVAL;
2191 }
2192
2193 // Enable parallel GC and adaptive generation sizing
2194 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2195 return JNI_EINVAL;
2196 }
2197 FLAG_SET_DEFAULT(ParallelGCThreads,
2198 Abstract_VM_Version::parallel_worker_threads());
2199
2200 // Encourage steady state memory management
2201 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2202 return JNI_EINVAL;
2203 }
2204
2205 // This appears to improve mutator locality
2206 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2207 return JNI_EINVAL;
2208 }
2209
2210 // Get around early Solaris scheduling bug
2211 // (affinity vs other jobs on system)
2212 // but disallow DR and offlining (5008695).
2213 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2214 return JNI_EINVAL;
2215 }
2216
2217 return JNI_OK;
2218 }
2219
2220 // This must be called after ergonomics.
2221 void Arguments::set_bytecode_flags() {
2222 if (!RewriteBytecodes) {
2223 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2224 }
2225 }
2226
2227 // Aggressive optimization flags -XX:+AggressiveOpts
2228 jint Arguments::set_aggressive_opts_flags() {
2229 #ifdef COMPILER2
2230 if (AggressiveUnboxing) {
2231 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2232 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2233 } else if (!EliminateAutoBox) {
2234 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2235 AggressiveUnboxing = false;
2236 }
2237 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2238 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2239 } else if (!DoEscapeAnalysis) {
2240 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2241 AggressiveUnboxing = false;
2242 }
2243 }
2244 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2246 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2247 }
2248 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2249 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2250 }
2251
2252 // Feed the cache size setting into the JDK
2253 char buffer[1024];
2254 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2255 if (!add_property(buffer)) {
2256 return JNI_ENOMEM;
2257 }
2258 }
2259 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2260 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2261 }
2262 #endif
2263
2264 if (AggressiveOpts) {
2265 // Sample flag setting code
2266 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2267 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2268 // }
2269 }
2270
2271 return JNI_OK;
2272 }
2273
2274 //===========================================================================================================
2275 // Parsing of java.compiler property
2276
2277 void Arguments::process_java_compiler_argument(const char* arg) {
2278 // For backwards compatibility, Djava.compiler=NONE or ""
2279 // causes us to switch to -Xint mode UNLESS -Xdebug
2280 // is also specified.
2281 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2282 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2283 }
2284 }
2285
2286 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2287 _sun_java_launcher = os::strdup_check_oom(launcher);
2288 }
2289
2290 bool Arguments::created_by_java_launcher() {
2291 assert(_sun_java_launcher != NULL, "property must have value");
2292 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2293 }
2294
2295 bool Arguments::sun_java_launcher_is_altjvm() {
2296 return _sun_java_launcher_is_altjvm;
2297 }
2298
2299 //===========================================================================================================
2300 // Parsing of main arguments
2301
2302 // Check consistency of GC selection
2303 bool Arguments::check_gc_consistency() {
2304 // Ensure that the user has not selected conflicting sets
2305 // of collectors.
2306 uint i = 0;
2307 if (UseSerialGC) i++;
2308 if (UseConcMarkSweepGC) i++;
2309 if (UseParallelGC || UseParallelOldGC) i++;
2310 if (UseG1GC) i++;
2311 if (i > 1) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "Conflicting collector combinations in option list; "
2314 "please refer to the release notes for the combinations "
2315 "allowed\n");
2316 return false;
2317 }
2318
2319 if (UseConcMarkSweepGC && !UseParNewGC) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2322 return false;
2323 }
2324
2325 if (UseParNewGC && !UseConcMarkSweepGC) {
2326 jio_fprintf(defaultStream::error_stream(),
2327 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2328 return false;
2329 }
2330
2331 return true;
2332 }
2333
2334 // Check the consistency of vm_init_args
2335 bool Arguments::check_vm_args_consistency() {
2336 // Method for adding checks for flag consistency.
2337 // The intent is to warn the user of all possible conflicts,
2338 // before returning an error.
2339 // Note: Needs platform-dependent factoring.
2340 bool status = true;
2341
2342 if (TLABRefillWasteFraction == 0) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "TLABRefillWasteFraction should be a denominator, "
2345 "not " SIZE_FORMAT "\n",
2346 TLABRefillWasteFraction);
2347 status = false;
2348 }
2349
2350 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2351 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2352 }
2353
2354 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2355 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2356 }
2357
2358 if (GCTimeLimit == 100) {
2359 // Turn off gc-overhead-limit-exceeded checks
2360 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2361 }
2362
2363 status = status && check_gc_consistency();
2364
2365 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2366 // insists that we hold the requisite locks so that the iteration is
2367 // MT-safe. For the verification at start-up and shut-down, we don't
2368 // yet have a good way of acquiring and releasing these locks,
2369 // which are not visible at the CollectedHeap level. We want to
2370 // be able to acquire these locks and then do the iteration rather
2371 // than just disable the lock verification. This will be fixed under
2372 // bug 4788986.
2373 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2374 if (VerifyDuringStartup) {
2375 warning("Heap verification at start-up disabled "
2376 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2377 VerifyDuringStartup = false; // Disable verification at start-up
2378 }
2379
2380 if (VerifyBeforeExit) {
2381 warning("Heap verification at shutdown disabled "
2382 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2383 VerifyBeforeExit = false; // Disable verification at shutdown
2384 }
2385 }
2386
2387 if (PrintNMTStatistics) {
2388 #if INCLUDE_NMT
2389 if (MemTracker::tracking_level() == NMT_off) {
2390 #endif // INCLUDE_NMT
2391 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2392 PrintNMTStatistics = false;
2393 #if INCLUDE_NMT
2394 }
2395 #endif
2396 }
2397 #if INCLUDE_JVMCI
2398 if (EnableJVMCI) {
2399 if (!ScavengeRootsInCode) {
2400 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2401 ScavengeRootsInCode = 1;
2402 }
2403 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2404 TypeProfileLevel = 0;
2405 }
2406 if (UseJVMCICompiler) {
2407 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2408 TypeProfileWidth = 8;
2409 }
2410 }
2411 }
2412 #endif
2413
2414 // Check lower bounds of the code cache
2415 // Template Interpreter code is approximately 3X larger in debug builds.
2416 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2417 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2418 jio_fprintf(defaultStream::error_stream(),
2419 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2420 os::vm_page_size()/K);
2421 status = false;
2422 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2425 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2426 status = false;
2427 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2430 min_code_cache_size/K);
2431 status = false;
2432 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2433 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2436 CODE_CACHE_SIZE_LIMIT/M);
2437 status = false;
2438 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2441 min_code_cache_size/K);
2442 status = false;
2443 }
2444
2445 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2446 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2447 }
2448
2449 #ifndef SUPPORT_RESERVED_STACK_AREA
2450 if (StackReservedPages != 0) {
2451 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2452 warning("Reserved Stack Area not supported on this platform");
2453 }
2454 #endif
2455 return status;
2456 }
2457
2458 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2459 const char* option_type) {
2460 if (ignore) return false;
2461
2462 const char* spacer = " ";
2463 if (option_type == NULL) {
2464 option_type = ++spacer; // Set both to the empty string.
2465 }
2466
2467 if (os::obsolete_option(option)) {
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Obsolete %s%soption: %s\n", option_type, spacer,
2470 option->optionString);
2471 return false;
2472 } else {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Unrecognized %s%soption: %s\n", option_type, spacer,
2475 option->optionString);
2476 return true;
2477 }
2478 }
2479
2480 static const char* user_assertion_options[] = {
2481 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2482 };
2483
2484 static const char* system_assertion_options[] = {
2485 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2486 };
2487
2488 bool Arguments::parse_uintx(const char* value,
2489 uintx* uintx_arg,
2490 uintx min_size) {
2491
2492 // Check the sign first since atomull() parses only unsigned values.
2493 bool value_is_positive = !(*value == '-');
2494
2495 if (value_is_positive) {
2496 julong n;
2497 bool good_return = atomull(value, &n);
2498 if (good_return) {
2499 bool above_minimum = n >= min_size;
2500 bool value_is_too_large = n > max_uintx;
2501
2502 if (above_minimum && !value_is_too_large) {
2503 *uintx_arg = n;
2504 return true;
2505 }
2506 }
2507 }
2508 return false;
2509 }
2510
2511 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2512 julong* long_arg,
2513 julong min_size) {
2514 if (!atomull(s, long_arg)) return arg_unreadable;
2515 return check_memory_size(*long_arg, min_size);
2516 }
2517
2518 // Parse JavaVMInitArgs structure
2519
2520 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2521 const JavaVMInitArgs *java_options_args,
2522 const JavaVMInitArgs *cmd_line_args) {
2523 // For components of the system classpath.
2524 SysClassPath scp(Arguments::get_sysclasspath());
2525 bool scp_assembly_required = false;
2526
2527 // Save default settings for some mode flags
2528 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2529 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2530 Arguments::_ClipInlining = ClipInlining;
2531 Arguments::_BackgroundCompilation = BackgroundCompilation;
2532 if (TieredCompilation) {
2533 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2534 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2535 }
2536
2537 // Setup flags for mixed which is the default
2538 set_mode_flags(_mixed);
2539
2540 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2541 // variable (if present).
2542 jint result = parse_each_vm_init_arg(
2543 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2544 if (result != JNI_OK) {
2545 return result;
2546 }
2547
2548 // Parse args structure generated from the command line flags.
2549 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2550 Flag::COMMAND_LINE);
2551 if (result != JNI_OK) {
2552 return result;
2553 }
2554
2555 // Parse args structure generated from the _JAVA_OPTIONS environment
2556 // variable (if present) (mimics classic VM)
2557 result = parse_each_vm_init_arg(
2558 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2559 if (result != JNI_OK) {
2560 return result;
2561 }
2562
2563 // Do final processing now that all arguments have been parsed
2564 result = finalize_vm_init_args(&scp, scp_assembly_required);
2565 if (result != JNI_OK) {
2566 return result;
2567 }
2568
2569 return JNI_OK;
2570 }
2571
2572 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2573 // represents a valid JDWP agent. is_path==true denotes that we
2574 // are dealing with -agentpath (case where name is a path), otherwise with
2575 // -agentlib
2576 bool valid_jdwp_agent(char *name, bool is_path) {
2577 char *_name;
2578 const char *_jdwp = "jdwp";
2579 size_t _len_jdwp, _len_prefix;
2580
2581 if (is_path) {
2582 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2583 return false;
2584 }
2585
2586 _name++; // skip past last path separator
2587 _len_prefix = strlen(JNI_LIB_PREFIX);
2588
2589 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2590 return false;
2591 }
2592
2593 _name += _len_prefix;
2594 _len_jdwp = strlen(_jdwp);
2595
2596 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2597 _name += _len_jdwp;
2598 }
2599 else {
2600 return false;
2601 }
2602
2603 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2604 return false;
2605 }
2606
2607 return true;
2608 }
2609
2610 if (strcmp(name, _jdwp) == 0) {
2611 return true;
2612 }
2613
2614 return false;
2615 }
2616
2617 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2618 SysClassPath* scp_p,
2619 bool* scp_assembly_required_p,
2620 Flag::Flags origin) {
2621 // Remaining part of option string
2622 const char* tail;
2623
2624 // iterate over arguments
2625 for (int index = 0; index < args->nOptions; index++) {
2626 bool is_absolute_path = false; // for -agentpath vs -agentlib
2627
2628 JavaVMOption* option = args->options + index;
2629
2630 if (!match_option(option, "-Djava.class.path", &tail) &&
2631 !match_option(option, "-Dsun.java.command", &tail) &&
2632 !match_option(option, "-Dsun.java.launcher", &tail)) {
2633
2634 // add all jvm options to the jvm_args string. This string
2635 // is used later to set the java.vm.args PerfData string constant.
2636 // the -Djava.class.path and the -Dsun.java.command options are
2637 // omitted from jvm_args string as each have their own PerfData
2638 // string constant object.
2639 build_jvm_args(option->optionString);
2640 }
2641
2642 // char buffer to store looked up logging option.
2643 char aliased_logging_option[256];
2644
2645 // Catch -XX options which are aliased to Unified logging commands.
2646 if (match_option(option, "-XX:", &tail)) {
2647 if (lookup_logging_aliases(option->optionString, aliased_logging_option)) {
2648 option->optionString = aliased_logging_option;
2649 }
2650 }
2651
2652 // -verbose:[class/gc/jni]
2653 if (match_option(option, "-verbose", &tail)) {
2654 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2655 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 } else if (!strcmp(tail, ":gc")) {
2662 // LogConfiguration_lock is not set up yet, but this code is executed by a single thread
2663 bool ret = LogConfiguration::parse_log_arguments("stdout", "gc", NULL, NULL, NULL);
2664 if (!ret) {
2665 return JNI_EINVAL;
2666 }
2667 } else if (!strcmp(tail, ":jni")) {
2668 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 }
2672 // -da / -ea / -disableassertions / -enableassertions
2673 // These accept an optional class/package name separated by a colon, e.g.,
2674 // -da:java.lang.Thread.
2675 } else if (match_option(option, user_assertion_options, &tail, true)) {
2676 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2677 if (*tail == '\0') {
2678 JavaAssertions::setUserClassDefault(enable);
2679 } else {
2680 assert(*tail == ':', "bogus match by match_option()");
2681 JavaAssertions::addOption(tail + 1, enable);
2682 }
2683 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2684 } else if (match_option(option, system_assertion_options, &tail, false)) {
2685 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2686 JavaAssertions::setSystemClassDefault(enable);
2687 // -bootclasspath:
2688 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2689 scp_p->reset_path(tail);
2690 *scp_assembly_required_p = true;
2691 // -bootclasspath/a:
2692 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2693 scp_p->add_suffix(tail);
2694 *scp_assembly_required_p = true;
2695 // -bootclasspath/p:
2696 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2697 scp_p->add_prefix(tail);
2698 *scp_assembly_required_p = true;
2699 // -Xrun
2700 } else if (match_option(option, "-Xrun", &tail)) {
2701 if (tail != NULL) {
2702 const char* pos = strchr(tail, ':');
2703 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2704 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2705 name[len] = '\0';
2706
2707 char *options = NULL;
2708 if(pos != NULL) {
2709 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2710 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2711 }
2712 #if !INCLUDE_JVMTI
2713 if (strcmp(name, "jdwp") == 0) {
2714 jio_fprintf(defaultStream::error_stream(),
2715 "Debugging agents are not supported in this VM\n");
2716 return JNI_ERR;
2717 }
2718 #endif // !INCLUDE_JVMTI
2719 add_init_library(name, options);
2720 }
2721 // -agentlib and -agentpath
2722 } else if (match_option(option, "-agentlib:", &tail) ||
2723 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2724 if(tail != NULL) {
2725 const char* pos = strchr(tail, '=');
2726 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2727 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2728 name[len] = '\0';
2729
2730 char *options = NULL;
2731 if(pos != NULL) {
2732 options = os::strdup_check_oom(pos + 1, mtInternal);
2733 }
2734 #if !INCLUDE_JVMTI
2735 if (valid_jdwp_agent(name, is_absolute_path)) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Debugging agents are not supported in this VM\n");
2738 return JNI_ERR;
2739 }
2740 #endif // !INCLUDE_JVMTI
2741 add_init_agent(name, options, is_absolute_path);
2742 }
2743 // -javaagent
2744 } else if (match_option(option, "-javaagent:", &tail)) {
2745 #if !INCLUDE_JVMTI
2746 jio_fprintf(defaultStream::error_stream(),
2747 "Instrumentation agents are not supported in this VM\n");
2748 return JNI_ERR;
2749 #else
2750 if(tail != NULL) {
2751 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2752 add_init_agent("instrument", options, false);
2753 }
2754 #endif // !INCLUDE_JVMTI
2755 // -Xnoclassgc
2756 } else if (match_option(option, "-Xnoclassgc")) {
2757 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 // -Xconcgc
2761 } else if (match_option(option, "-Xconcgc")) {
2762 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 // -Xnoconcgc
2766 } else if (match_option(option, "-Xnoconcgc")) {
2767 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 // -Xbatch
2771 } else if (match_option(option, "-Xbatch")) {
2772 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 // -Xmn for compatibility with other JVM vendors
2776 } else if (match_option(option, "-Xmn", &tail)) {
2777 julong long_initial_young_size = 0;
2778 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2779 if (errcode != arg_in_range) {
2780 jio_fprintf(defaultStream::error_stream(),
2781 "Invalid initial young generation size: %s\n", option->optionString);
2782 describe_range_error(errcode);
2783 return JNI_EINVAL;
2784 }
2785 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 // -Xms
2792 } else if (match_option(option, "-Xms", &tail)) {
2793 julong long_initial_heap_size = 0;
2794 // an initial heap size of 0 means automatically determine
2795 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2796 if (errcode != arg_in_range) {
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Invalid initial heap size: %s\n", option->optionString);
2799 describe_range_error(errcode);
2800 return JNI_EINVAL;
2801 }
2802 set_min_heap_size((size_t)long_initial_heap_size);
2803 // Currently the minimum size and the initial heap sizes are the same.
2804 // Can be overridden with -XX:InitialHeapSize.
2805 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 // -Xmx
2809 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2810 julong long_max_heap_size = 0;
2811 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2812 if (errcode != arg_in_range) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid maximum heap size: %s\n", option->optionString);
2815 describe_range_error(errcode);
2816 return JNI_EINVAL;
2817 }
2818 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2819 return JNI_EINVAL;
2820 }
2821 // Xmaxf
2822 } else if (match_option(option, "-Xmaxf", &tail)) {
2823 char* err;
2824 int maxf = (int)(strtod(tail, &err) * 100);
2825 if (*err != '\0' || *tail == '\0') {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Bad max heap free percentage size: %s\n",
2828 option->optionString);
2829 return JNI_EINVAL;
2830 } else {
2831 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 }
2835 // Xminf
2836 } else if (match_option(option, "-Xminf", &tail)) {
2837 char* err;
2838 int minf = (int)(strtod(tail, &err) * 100);
2839 if (*err != '\0' || *tail == '\0') {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Bad min heap free percentage size: %s\n",
2842 option->optionString);
2843 return JNI_EINVAL;
2844 } else {
2845 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 }
2849 // -Xss
2850 } else if (match_option(option, "-Xss", &tail)) {
2851 julong long_ThreadStackSize = 0;
2852 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2853 if (errcode != arg_in_range) {
2854 jio_fprintf(defaultStream::error_stream(),
2855 "Invalid thread stack size: %s\n", option->optionString);
2856 describe_range_error(errcode);
2857 return JNI_EINVAL;
2858 }
2859 // Internally track ThreadStackSize in units of 1024 bytes.
2860 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2861 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2862 return JNI_EINVAL;
2863 }
2864 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2865 } else if (match_option(option, "-Xoss", &tail) ||
2866 match_option(option, "-Xsqnopause") ||
2867 match_option(option, "-Xoptimize") ||
2868 match_option(option, "-Xboundthreads") ||
2869 match_option(option, "-Xusealtsigs")) {
2870 // All these options are deprecated in JDK 9 and will be removed in a future release
2871 char version[256];
2872 JDK_Version::jdk(9).to_string(version, sizeof(version));
2873 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2874 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2875 julong long_CodeCacheExpansionSize = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2880 os::vm_page_size()/K);
2881 return JNI_EINVAL;
2882 }
2883 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2887 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2888 julong long_ReservedCodeCacheSize = 0;
2889
2890 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2891 if (errcode != arg_in_range) {
2892 jio_fprintf(defaultStream::error_stream(),
2893 "Invalid maximum code cache size: %s.\n", option->optionString);
2894 return JNI_EINVAL;
2895 }
2896 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 // -XX:NonNMethodCodeHeapSize=
2900 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2901 julong long_NonNMethodCodeHeapSize = 0;
2902
2903 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2904 if (errcode != arg_in_range) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2907 return JNI_EINVAL;
2908 }
2909 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2910 return JNI_EINVAL;
2911 }
2912 // -XX:ProfiledCodeHeapSize=
2913 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2914 julong long_ProfiledCodeHeapSize = 0;
2915
2916 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2917 if (errcode != arg_in_range) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2920 return JNI_EINVAL;
2921 }
2922 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 // -XX:NonProfiledCodeHeapSizee=
2926 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2927 julong long_NonProfiledCodeHeapSize = 0;
2928
2929 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2930 if (errcode != arg_in_range) {
2931 jio_fprintf(defaultStream::error_stream(),
2932 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2933 return JNI_EINVAL;
2934 }
2935 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938 // -green
2939 } else if (match_option(option, "-green")) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Green threads support not available\n");
2942 return JNI_EINVAL;
2943 // -native
2944 } else if (match_option(option, "-native")) {
2945 // HotSpot always uses native threads, ignore silently for compatibility
2946 // -Xrs
2947 } else if (match_option(option, "-Xrs")) {
2948 // Classic/EVM option, new functionality
2949 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 // -Xprof
2953 } else if (match_option(option, "-Xprof")) {
2954 #if INCLUDE_FPROF
2955 _has_profile = true;
2956 #else // INCLUDE_FPROF
2957 jio_fprintf(defaultStream::error_stream(),
2958 "Flat profiling is not supported in this VM.\n");
2959 return JNI_ERR;
2960 #endif // INCLUDE_FPROF
2961 // -Xconcurrentio
2962 } else if (match_option(option, "-Xconcurrentio")) {
2963 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2973 return JNI_EINVAL;
2974 }
2975 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2976 return JNI_EINVAL;
2977 }
2978
2979 // -Xinternalversion
2980 } else if (match_option(option, "-Xinternalversion")) {
2981 jio_fprintf(defaultStream::output_stream(), "%s\n",
2982 VM_Version::internal_vm_info_string());
2983 vm_exit(0);
2984 #ifndef PRODUCT
2985 // -Xprintflags
2986 } else if (match_option(option, "-Xprintflags")) {
2987 CommandLineFlags::printFlags(tty, false);
2988 vm_exit(0);
2989 #endif
2990 // -D
2991 } else if (match_option(option, "-D", &tail)) {
2992 const char* value;
2993 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2994 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2995 // abort if -Djava.endorsed.dirs is set
2996 jio_fprintf(defaultStream::output_stream(),
2997 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2998 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2999 return JNI_EINVAL;
3000 }
3001 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3002 *value != '\0' && strcmp(value, "\"\"") != 0) {
3003 // abort if -Djava.ext.dirs is set
3004 jio_fprintf(defaultStream::output_stream(),
3005 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3006 return JNI_EINVAL;
3007 }
3008
3009 if (!add_property(tail)) {
3010 return JNI_ENOMEM;
3011 }
3012 // Out of the box management support
3013 if (match_option(option, "-Dcom.sun.management", &tail)) {
3014 #if INCLUDE_MANAGEMENT
3015 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 #else
3019 jio_fprintf(defaultStream::output_stream(),
3020 "-Dcom.sun.management is not supported in this VM.\n");
3021 return JNI_ERR;
3022 #endif
3023 }
3024 // -Xint
3025 } else if (match_option(option, "-Xint")) {
3026 set_mode_flags(_int);
3027 // -Xmixed
3028 } else if (match_option(option, "-Xmixed")) {
3029 set_mode_flags(_mixed);
3030 // -Xcomp
3031 } else if (match_option(option, "-Xcomp")) {
3032 // for testing the compiler; turn off all flags that inhibit compilation
3033 set_mode_flags(_comp);
3034 // -Xshare:dump
3035 } else if (match_option(option, "-Xshare:dump")) {
3036 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 set_mode_flags(_int); // Prevent compilation, which creates objects
3040 // -Xshare:on
3041 } else if (match_option(option, "-Xshare:on")) {
3042 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 // -Xshare:auto
3049 } else if (match_option(option, "-Xshare:auto")) {
3050 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 // -Xshare:off
3057 } else if (match_option(option, "-Xshare:off")) {
3058 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 // -Xverify
3065 } else if (match_option(option, "-Xverify", &tail)) {
3066 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3067 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 } else if (strcmp(tail, ":remote") == 0) {
3074 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 } else if (strcmp(tail, ":none") == 0) {
3081 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3082 return JNI_EINVAL;
3083 }
3084 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3088 return JNI_EINVAL;
3089 }
3090 // -Xdebug
3091 } else if (match_option(option, "-Xdebug")) {
3092 // note this flag has been used, then ignore
3093 set_xdebug_mode(true);
3094 // -Xnoagent
3095 } else if (match_option(option, "-Xnoagent")) {
3096 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3097 } else if (match_option(option, "-Xlog", &tail)) {
3098 bool ret = false;
3099 if (strcmp(tail, ":help") == 0) {
3100 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3101 vm_exit(0);
3102 } else if (strcmp(tail, ":disable") == 0) {
3103 LogConfiguration::disable_logging();
3104 ret = true;
3105 } else if (*tail == '\0') {
3106 ret = LogConfiguration::parse_command_line_arguments();
3107 assert(ret, "-Xlog without arguments should never fail to parse");
3108 } else if (*tail == ':') {
3109 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3110 }
3111 if (ret == false) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid -Xlog option '-Xlog%s'\n",
3114 tail);
3115 return JNI_EINVAL;
3116 }
3117 // JNI hooks
3118 } else if (match_option(option, "-Xcheck", &tail)) {
3119 if (!strcmp(tail, ":jni")) {
3120 #if !INCLUDE_JNI_CHECK
3121 warning("JNI CHECKING is not supported in this VM");
3122 #else
3123 CheckJNICalls = true;
3124 #endif // INCLUDE_JNI_CHECK
3125 } else if (is_bad_option(option, args->ignoreUnrecognized,
3126 "check")) {
3127 return JNI_EINVAL;
3128 }
3129 } else if (match_option(option, "vfprintf")) {
3130 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3131 } else if (match_option(option, "exit")) {
3132 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3133 } else if (match_option(option, "abort")) {
3134 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3135 // -XX:+AggressiveHeap
3136 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3137 jint result = set_aggressive_heap_flags();
3138 if (result != JNI_OK) {
3139 return result;
3140 }
3141 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3142 // and the last option wins.
3143 } else if (match_option(option, "-XX:+NeverTenure")) {
3144 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3145 return JNI_EINVAL;
3146 }
3147 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3154 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3158 return JNI_EINVAL;
3159 }
3160 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3164 uintx max_tenuring_thresh = 0;
3165 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3166 jio_fprintf(defaultStream::error_stream(),
3167 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3168 return JNI_EINVAL;
3169 }
3170
3171 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174
3175 if (MaxTenuringThreshold == 0) {
3176 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 } else {
3183 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 }
3190 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3191 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3198 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3205 #if defined(DTRACE_ENABLED)
3206 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3213 return JNI_EINVAL;
3214 }
3215 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218 #else // defined(DTRACE_ENABLED)
3219 jio_fprintf(defaultStream::error_stream(),
3220 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3221 return JNI_EINVAL;
3222 #endif // defined(DTRACE_ENABLED)
3223 #ifdef ASSERT
3224 } else if (match_option(option, "-XX:+FullGCALot")) {
3225 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3226 return JNI_EINVAL;
3227 }
3228 // disable scavenge before parallel mark-compact
3229 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3230 return JNI_EINVAL;
3231 }
3232 #endif
3233 #if !INCLUDE_MANAGEMENT
3234 } else if (match_option(option, "-XX:+ManagementServer")) {
3235 jio_fprintf(defaultStream::error_stream(),
3236 "ManagementServer is not supported in this VM.\n");
3237 return JNI_ERR;
3238 #endif // INCLUDE_MANAGEMENT
3239 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3240 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3241 // already been handled
3242 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3243 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3244 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3245 return JNI_EINVAL;
3246 }
3247 }
3248 // Unknown option
3249 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3250 return JNI_ERR;
3251 }
3252 }
3253
3254 // PrintSharedArchiveAndExit will turn on
3255 // -Xshare:on
3256 // -XX:+TraceClassPaths
3257 if (PrintSharedArchiveAndExit) {
3258 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3259 return JNI_EINVAL;
3260 }
3261 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3262 return JNI_EINVAL;
3263 }
3264 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3265 return JNI_EINVAL;
3266 }
3267 }
3268
3269 // Change the default value for flags which have different default values
3270 // when working with older JDKs.
3271 #ifdef LINUX
3272 if (JDK_Version::current().compare_major(6) <= 0 &&
3273 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3274 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3275 }
3276 #endif // LINUX
3277 fix_appclasspath();
3278 return JNI_OK;
3279 }
3280
3281 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3282 //
3283 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3284 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3285 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3286 // path is treated as the current directory.
3287 //
3288 // This causes problems with CDS, which requires that all directories specified in the classpath
3289 // must be empty. In most cases, applications do NOT want to load classes from the current
3290 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3291 // scripts compatible with CDS.
3292 void Arguments::fix_appclasspath() {
3293 if (IgnoreEmptyClassPaths) {
3294 const char separator = *os::path_separator();
3295 const char* src = _java_class_path->value();
3296
3297 // skip over all the leading empty paths
3298 while (*src == separator) {
3299 src ++;
3300 }
3301
3302 char* copy = os::strdup_check_oom(src, mtInternal);
3303
3304 // trim all trailing empty paths
3305 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3306 *tail = '\0';
3307 }
3308
3309 char from[3] = {separator, separator, '\0'};
3310 char to [2] = {separator, '\0'};
3311 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3312 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3313 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3314 }
3315
3316 _java_class_path->set_value(copy);
3317 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3318 }
3319
3320 if (!PrintSharedArchiveAndExit) {
3321 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3322 }
3323 }
3324
3325 static bool has_jar_files(const char* directory) {
3326 DIR* dir = os::opendir(directory);
3327 if (dir == NULL) return false;
3328
3329 struct dirent *entry;
3330 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3331 bool hasJarFile = false;
3332 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3333 const char* name = entry->d_name;
3334 const char* ext = name + strlen(name) - 4;
3335 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3336 }
3337 FREE_C_HEAP_ARRAY(char, dbuf);
3338 os::closedir(dir);
3339 return hasJarFile ;
3340 }
3341
3342 static int check_non_empty_dirs(const char* path) {
3343 const char separator = *os::path_separator();
3344 const char* const end = path + strlen(path);
3345 int nonEmptyDirs = 0;
3346 while (path < end) {
3347 const char* tmp_end = strchr(path, separator);
3348 if (tmp_end == NULL) {
3349 if (has_jar_files(path)) {
3350 nonEmptyDirs++;
3351 jio_fprintf(defaultStream::output_stream(),
3352 "Non-empty directory: %s\n", path);
3353 }
3354 path = end;
3355 } else {
3356 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3357 memcpy(dirpath, path, tmp_end - path);
3358 dirpath[tmp_end - path] = '\0';
3359 if (has_jar_files(dirpath)) {
3360 nonEmptyDirs++;
3361 jio_fprintf(defaultStream::output_stream(),
3362 "Non-empty directory: %s\n", dirpath);
3363 }
3364 FREE_C_HEAP_ARRAY(char, dirpath);
3365 path = tmp_end + 1;
3366 }
3367 }
3368 return nonEmptyDirs;
3369 }
3370
3371 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3372 // check if the default lib/endorsed directory exists; if so, error
3373 char path[JVM_MAXPATHLEN];
3374 const char* fileSep = os::file_separator();
3375 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3376
3377 #if INCLUDE_JVMCI
3378 if (EnableJVMCI) {
3379 JVMCIRuntime::save_options(_system_properties);
3380 }
3381 #endif // INCLUDE_JVMCI
3382
3383 if (CheckEndorsedAndExtDirs) {
3384 int nonEmptyDirs = 0;
3385 // check endorsed directory
3386 nonEmptyDirs += check_non_empty_dirs(path);
3387 // check the extension directories
3388 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3389 if (nonEmptyDirs > 0) {
3390 return JNI_ERR;
3391 }
3392 }
3393
3394 DIR* dir = os::opendir(path);
3395 if (dir != NULL) {
3396 jio_fprintf(defaultStream::output_stream(),
3397 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3398 "in modular form will be supported via the concept of upgradeable modules.\n");
3399 os::closedir(dir);
3400 return JNI_ERR;
3401 }
3402
3403 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3404 dir = os::opendir(path);
3405 if (dir != NULL) {
3406 jio_fprintf(defaultStream::output_stream(),
3407 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3408 "Use -classpath instead.\n.");
3409 os::closedir(dir);
3410 return JNI_ERR;
3411 }
3412
3413 if (scp_assembly_required) {
3414 // Assemble the bootclasspath elements into the final path.
3415 char *combined_path = scp_p->combined_path();
3416 Arguments::set_sysclasspath(combined_path);
3417 FREE_C_HEAP_ARRAY(char, combined_path);
3418 }
3419
3420 // This must be done after all arguments have been processed.
3421 // java_compiler() true means set to "NONE" or empty.
3422 if (java_compiler() && !xdebug_mode()) {
3423 // For backwards compatibility, we switch to interpreted mode if
3424 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3425 // not specified.
3426 set_mode_flags(_int);
3427 }
3428
3429 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3430 // but like -Xint, leave compilation thresholds unaffected.
3431 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3432 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3433 set_mode_flags(_int);
3434 }
3435
3436 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3437 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3438 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3439 }
3440
3441 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3442 // Don't degrade server performance for footprint
3443 if (FLAG_IS_DEFAULT(UseLargePages) &&
3444 MaxHeapSize < LargePageHeapSizeThreshold) {
3445 // No need for large granularity pages w/small heaps.
3446 // Note that large pages are enabled/disabled for both the
3447 // Java heap and the code cache.
3448 FLAG_SET_DEFAULT(UseLargePages, false);
3449 }
3450
3451 #elif defined(COMPILER2)
3452 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3453 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3454 }
3455 #endif
3456
3457 #ifndef TIERED
3458 // Tiered compilation is undefined.
3459 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3460 #endif
3461
3462 // If we are running in a headless jre, force java.awt.headless property
3463 // to be true unless the property has already been set.
3464 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3465 if (os::is_headless_jre()) {
3466 const char* headless = Arguments::get_property("java.awt.headless");
3467 if (headless == NULL) {
3468 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3469 if (headless_env == NULL) {
3470 if (!add_property("java.awt.headless=true")) {
3471 return JNI_ENOMEM;
3472 }
3473 } else {
3474 char buffer[256];
3475 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3476 if (!add_property(buffer)) {
3477 return JNI_ENOMEM;
3478 }
3479 }
3480 }
3481 }
3482
3483 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3484 // CMS can only be used with ParNew
3485 FLAG_SET_ERGO(bool, UseParNewGC, true);
3486 }
3487
3488 if (!check_vm_args_consistency()) {
3489 return JNI_ERR;
3490 }
3491
3492 return JNI_OK;
3493 }
3494
3495 // Helper class for controlling the lifetime of JavaVMInitArgs
3496 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3497 // deleted on the destruction of the ScopedVMInitArgs object.
3498 class ScopedVMInitArgs : public StackObj {
3499 private:
3500 JavaVMInitArgs _args;
3501 bool _is_set;
3502
3503 public:
3504 ScopedVMInitArgs() {
3505 _args.version = JNI_VERSION_1_2;
3506 _args.nOptions = 0;
3507 _args.options = NULL;
3508 _args.ignoreUnrecognized = false;
3509 _is_set = false;
3510 }
3511
3512 // Populates the JavaVMInitArgs object represented by this
3513 // ScopedVMInitArgs object with the arguments in options. The
3514 // allocated memory is deleted by the destructor. If this method
3515 // returns anything other than JNI_OK, then this object is in a
3516 // partially constructed state, and should be abandoned.
3517 jint set_args(GrowableArray<JavaVMOption>* options) {
3518 _is_set = true;
3519 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3520 JavaVMOption, options->length(), mtInternal);
3521 if (options_arr == NULL) {
3522 return JNI_ENOMEM;
3523 }
3524 _args.options = options_arr;
3525
3526 for (int i = 0; i < options->length(); i++) {
3527 options_arr[i] = options->at(i);
3528 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3529 if (options_arr[i].optionString == NULL) {
3530 // Rely on the destructor to do cleanup.
3531 _args.nOptions = i;
3532 return JNI_ENOMEM;
3533 }
3534 }
3535
3536 _args.nOptions = options->length();
3537 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3538 return JNI_OK;
3539 }
3540
3541 JavaVMInitArgs* get() { return &_args; }
3542 bool is_set() { return _is_set; }
3543
3544 ~ScopedVMInitArgs() {
3545 if (_args.options == NULL) return;
3546 for (int i = 0; i < _args.nOptions; i++) {
3547 os::free(_args.options[i].optionString);
3548 }
3549 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3550 }
3551
3552 // Insert options into this option list, to replace option at
3553 // vm_options_file_pos (-XX:VMOptionsFile)
3554 jint insert(const JavaVMInitArgs* args,
3555 const JavaVMInitArgs* args_to_insert,
3556 const int vm_options_file_pos) {
3557 assert(_args.options == NULL, "shouldn't be set yet");
3558 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3559 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3560
3561 int length = args->nOptions + args_to_insert->nOptions - 1;
3562 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3563 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3564 for (int i = 0; i < args->nOptions; i++) {
3565 if (i == vm_options_file_pos) {
3566 // insert the new options starting at the same place as the
3567 // -XX:VMOptionsFile option
3568 for (int j = 0; j < args_to_insert->nOptions; j++) {
3569 options->push(args_to_insert->options[j]);
3570 }
3571 } else {
3572 options->push(args->options[i]);
3573 }
3574 }
3575 // make into options array
3576 jint result = set_args(options);
3577 delete options;
3578 return result;
3579 }
3580 };
3581
3582 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3583 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3584 }
3585
3586 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3587 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3588 }
3589
3590 jint Arguments::parse_options_environment_variable(const char* name,
3591 ScopedVMInitArgs* vm_args) {
3592 char *buffer = ::getenv(name);
3593
3594 // Don't check this environment variable if user has special privileges
3595 // (e.g. unix su command).
3596 if (buffer == NULL || os::have_special_privileges()) {
3597 return JNI_OK;
3598 }
3599
3600 if ((buffer = os::strdup(buffer)) == NULL) {
3601 return JNI_ENOMEM;
3602 }
3603
3604 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3605
3606 os::free(buffer);
3607 return retcode;
3608 }
3609
3610 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3611 // read file into buffer
3612 int fd = ::open(file_name, O_RDONLY);
3613 if (fd < 0) {
3614 jio_fprintf(defaultStream::error_stream(),
3615 "Could not open options file '%s'\n",
3616 file_name);
3617 return JNI_ERR;
3618 }
3619
3620 struct stat stbuf;
3621 int retcode = os::stat(file_name, &stbuf);
3622 if (retcode != 0) {
3623 jio_fprintf(defaultStream::error_stream(),
3624 "Could not stat options file '%s'\n",
3625 file_name);
3626 os::close(fd);
3627 return JNI_ERR;
3628 }
3629
3630 if (stbuf.st_size == 0) {
3631 // tell caller there is no option data and that is ok
3632 os::close(fd);
3633 return JNI_OK;
3634 }
3635
3636 // '+ 1' for NULL termination even with max bytes
3637 size_t bytes_alloc = stbuf.st_size + 1;
3638
3639 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3640 if (NULL == buf) {
3641 jio_fprintf(defaultStream::error_stream(),
3642 "Could not allocate read buffer for options file parse\n");
3643 os::close(fd);
3644 return JNI_ENOMEM;
3645 }
3646
3647 memset(buf, 0, bytes_alloc);
3648
3649 // Fill buffer
3650 // Use ::read() instead of os::read because os::read()
3651 // might do a thread state transition
3652 // and it is too early for that here
3653
3654 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3655 os::close(fd);
3656 if (bytes_read < 0) {
3657 FREE_C_HEAP_ARRAY(char, buf);
3658 jio_fprintf(defaultStream::error_stream(),
3659 "Could not read options file '%s'\n", file_name);
3660 return JNI_ERR;
3661 }
3662
3663 if (bytes_read == 0) {
3664 // tell caller there is no option data and that is ok
3665 FREE_C_HEAP_ARRAY(char, buf);
3666 return JNI_OK;
3667 }
3668
3669 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3670
3671 FREE_C_HEAP_ARRAY(char, buf);
3672 return retcode;
3673 }
3674
3675 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3676 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3677
3678 // some pointers to help with parsing
3679 char *buffer_end = buffer + buf_len;
3680 char *opt_hd = buffer;
3681 char *wrt = buffer;
3682 char *rd = buffer;
3683
3684 // parse all options
3685 while (rd < buffer_end) {
3686 // skip leading white space from the input string
3687 while (rd < buffer_end && isspace(*rd)) {
3688 rd++;
3689 }
3690
3691 if (rd >= buffer_end) {
3692 break;
3693 }
3694
3695 // Remember this is where we found the head of the token.
3696 opt_hd = wrt;
3697
3698 // Tokens are strings of non white space characters separated
3699 // by one or more white spaces.
3700 while (rd < buffer_end && !isspace(*rd)) {
3701 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3702 int quote = *rd; // matching quote to look for
3703 rd++; // don't copy open quote
3704 while (rd < buffer_end && *rd != quote) {
3705 // include everything (even spaces)
3706 // up until the close quote
3707 *wrt++ = *rd++; // copy to option string
3708 }
3709
3710 if (rd < buffer_end) {
3711 rd++; // don't copy close quote
3712 } else {
3713 // did not see closing quote
3714 jio_fprintf(defaultStream::error_stream(),
3715 "Unmatched quote in %s\n", name);
3716 delete options;
3717 return JNI_ERR;
3718 }
3719 } else {
3720 *wrt++ = *rd++; // copy to option string
3721 }
3722 }
3723
3724 // steal a white space character and set it to NULL
3725 *wrt++ = '\0';
3726 // We now have a complete token
3727
3728 JavaVMOption option;
3729 option.optionString = opt_hd;
3730 option.extraInfo = NULL;
3731
3732 options->append(option); // Fill in option
3733
3734 rd++; // Advance to next character
3735 }
3736
3737 // Fill out JavaVMInitArgs structure.
3738 jint status = vm_args->set_args(options);
3739
3740 delete options;
3741 return status;
3742 }
3743
3744 void Arguments::set_shared_spaces_flags() {
3745 if (DumpSharedSpaces) {
3746 if (RequireSharedSpaces) {
3747 warning("Cannot dump shared archive while using shared archive");
3748 }
3749 UseSharedSpaces = false;
3750 #ifdef _LP64
3751 if (!UseCompressedOops || !UseCompressedClassPointers) {
3752 vm_exit_during_initialization(
3753 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3754 }
3755 } else {
3756 if (!UseCompressedOops || !UseCompressedClassPointers) {
3757 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3758 }
3759 #endif
3760 }
3761 }
3762
3763 #if !INCLUDE_ALL_GCS
3764 static void force_serial_gc() {
3765 FLAG_SET_DEFAULT(UseSerialGC, true);
3766 UNSUPPORTED_GC_OPTION(UseG1GC);
3767 UNSUPPORTED_GC_OPTION(UseParallelGC);
3768 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3769 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3770 UNSUPPORTED_GC_OPTION(UseParNewGC);
3771 }
3772 #endif // INCLUDE_ALL_GCS
3773
3774 // Sharing support
3775 // Construct the path to the archive
3776 static char* get_shared_archive_path() {
3777 char *shared_archive_path;
3778 if (SharedArchiveFile == NULL) {
3779 char jvm_path[JVM_MAXPATHLEN];
3780 os::jvm_path(jvm_path, sizeof(jvm_path));
3781 char *end = strrchr(jvm_path, *os::file_separator());
3782 if (end != NULL) *end = '\0';
3783 size_t jvm_path_len = strlen(jvm_path);
3784 size_t file_sep_len = strlen(os::file_separator());
3785 const size_t len = jvm_path_len + file_sep_len + 20;
3786 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3787 if (shared_archive_path != NULL) {
3788 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3789 jvm_path, os::file_separator());
3790 }
3791 } else {
3792 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3793 }
3794 return shared_archive_path;
3795 }
3796
3797 #ifndef PRODUCT
3798 // Determine whether LogVMOutput should be implicitly turned on.
3799 static bool use_vm_log() {
3800 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3801 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3802 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3803 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3804 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3805 return true;
3806 }
3807
3808 #ifdef COMPILER1
3809 if (PrintC1Statistics) {
3810 return true;
3811 }
3812 #endif // COMPILER1
3813
3814 #ifdef COMPILER2
3815 if (PrintOptoAssembly || PrintOptoStatistics) {
3816 return true;
3817 }
3818 #endif // COMPILER2
3819
3820 return false;
3821 }
3822
3823 #endif // PRODUCT
3824
3825 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3826 char** vm_options_file,
3827 const int vm_options_file_pos,
3828 ScopedVMInitArgs *vm_options_file_args,
3829 ScopedVMInitArgs* args_out) {
3830 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3831 if (code != JNI_OK) {
3832 return code;
3833 }
3834
3835 if (vm_options_file_args->get()->nOptions < 1) {
3836 return JNI_OK;
3837 }
3838
3839 return args_out->insert(args, vm_options_file_args->get(),
3840 vm_options_file_pos);
3841 }
3842
3843 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3844 char ** vm_options_file,
3845 ScopedVMInitArgs* args_out) {
3846 // Remaining part of option string
3847 const char* tail;
3848 int vm_options_file_pos = -1;
3849 ScopedVMInitArgs vm_options_file_args;
3850
3851 for (int index = 0; index < args->nOptions; index++) {
3852 const JavaVMOption* option = args->options + index;
3853 if (ArgumentsExt::process_options(option)) {
3854 continue;
3855 }
3856 if (match_option(option, "-XX:Flags=", &tail)) {
3857 Arguments::set_jvm_flags_file(tail);
3858 continue;
3859 }
3860 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3861 if (vm_options_file != NULL) {
3862 // The caller accepts -XX:VMOptionsFile
3863 if (*vm_options_file != NULL) {
3864 jio_fprintf(defaultStream::error_stream(),
3865 "The VM Options file can only be specified once and "
3866 "only on the command line.\n");
3867 return JNI_EINVAL;
3868 }
3869
3870 *vm_options_file = (char *) tail;
3871 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
3872 // If there's a VMOptionsFile, parse that (also can set flags_file)
3873 jint code = insert_vm_options_file(args, vm_options_file,
3874 vm_options_file_pos,
3875 &vm_options_file_args, args_out);
3876 if (code != JNI_OK) {
3877 return code;
3878 }
3879 if (args_out->is_set()) {
3880 // The VMOptions file inserted some options so switch 'args'
3881 // to the new set of options, and continue processing which
3882 // preserves "last option wins" semantics.
3883 args = args_out->get();
3884 // The first option from the VMOptionsFile replaces the
3885 // current option. So we back track to process the
3886 // replacement option.
3887 index--;
3888 }
3889 } else {
3890 jio_fprintf(defaultStream::error_stream(),
3891 "VM options file is only supported on the command line\n");
3892 return JNI_EINVAL;
3893 }
3894 continue;
3895 }
3896 if (match_option(option, "-XX:+PrintVMOptions")) {
3897 PrintVMOptions = true;
3898 continue;
3899 }
3900 if (match_option(option, "-XX:-PrintVMOptions")) {
3901 PrintVMOptions = false;
3902 continue;
3903 }
3904 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3905 IgnoreUnrecognizedVMOptions = true;
3906 continue;
3907 }
3908 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3909 IgnoreUnrecognizedVMOptions = false;
3910 continue;
3911 }
3912 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3913 CommandLineFlags::printFlags(tty, false);
3914 vm_exit(0);
3915 }
3916 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3917 #if INCLUDE_NMT
3918 // The launcher did not setup nmt environment variable properly.
3919 if (!MemTracker::check_launcher_nmt_support(tail)) {
3920 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3921 }
3922
3923 // Verify if nmt option is valid.
3924 if (MemTracker::verify_nmt_option()) {
3925 // Late initialization, still in single-threaded mode.
3926 if (MemTracker::tracking_level() >= NMT_summary) {
3927 MemTracker::init();
3928 }
3929 } else {
3930 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3931 }
3932 continue;
3933 #else
3934 jio_fprintf(defaultStream::error_stream(),
3935 "Native Memory Tracking is not supported in this VM\n");
3936 return JNI_ERR;
3937 #endif
3938 }
3939
3940 #ifndef PRODUCT
3941 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3942 CommandLineFlags::printFlags(tty, true);
3943 vm_exit(0);
3944 }
3945 #endif
3946 }
3947 return JNI_OK;
3948 }
3949
3950 static void print_options(const JavaVMInitArgs *args) {
3951 const char* tail;
3952 for (int index = 0; index < args->nOptions; index++) {
3953 const JavaVMOption *option = args->options + index;
3954 if (match_option(option, "-XX:", &tail)) {
3955 logOption(tail);
3956 }
3957 }
3958 }
3959
3960 // Parse entry point called from JNI_CreateJavaVM
3961
3962 jint Arguments::parse(const JavaVMInitArgs* args) {
3963 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3964
3965 // Initialize ranges and constraints
3966 CommandLineFlagRangeList::init();
3967 CommandLineFlagConstraintList::init();
3968
3969 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3970 const char* hotspotrc = ".hotspotrc";
3971 char* vm_options_file = NULL;
3972 bool settings_file_specified = false;
3973 bool needs_hotspotrc_warning = false;
3974 ScopedVMInitArgs java_tool_options_args;
3975 ScopedVMInitArgs java_options_args;
3976 ScopedVMInitArgs modified_cmd_line_args;
3977
3978 jint code =
3979 parse_java_tool_options_environment_variable(&java_tool_options_args);
3980 if (code != JNI_OK) {
3981 return code;
3982 }
3983
3984 code = parse_java_options_environment_variable(&java_options_args);
3985 if (code != JNI_OK) {
3986 return code;
3987 }
3988
3989 code = match_special_option_and_act(java_tool_options_args.get(),
3990 NULL, NULL);
3991 if (code != JNI_OK) {
3992 return code;
3993 }
3994
3995 code = match_special_option_and_act(args, &vm_options_file,
3996 &modified_cmd_line_args);
3997 if (code != JNI_OK) {
3998 return code;
3999 }
4000
4001
4002 // The command line arguments have been modified to include VMOptionsFile arguments.
4003 if (modified_cmd_line_args.is_set()) {
4004 args = modified_cmd_line_args.get();
4005 }
4006
4007 code = match_special_option_and_act(java_options_args.get(),
4008 NULL, NULL);
4009 if (code != JNI_OK) {
4010 return code;
4011 }
4012
4013 const char * flags_file = Arguments::get_jvm_flags_file();
4014 settings_file_specified = (flags_file != NULL);
4015
4016 if (IgnoreUnrecognizedVMOptions) {
4017 // uncast const to modify the flag args->ignoreUnrecognized
4018 *(jboolean*)(&args->ignoreUnrecognized) = true;
4019 java_tool_options_args.get()->ignoreUnrecognized = true;
4020 java_options_args.get()->ignoreUnrecognized = true;
4021 }
4022
4023 // Parse specified settings file
4024 if (settings_file_specified) {
4025 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4026 return JNI_EINVAL;
4027 }
4028 } else {
4029 #ifdef ASSERT
4030 // Parse default .hotspotrc settings file
4031 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4032 return JNI_EINVAL;
4033 }
4034 #else
4035 struct stat buf;
4036 if (os::stat(hotspotrc, &buf) == 0) {
4037 needs_hotspotrc_warning = true;
4038 }
4039 #endif
4040 }
4041
4042 if (PrintVMOptions) {
4043 print_options(java_tool_options_args.get());
4044 print_options(args);
4045 print_options(java_options_args.get());
4046 }
4047
4048 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4049 jint result = parse_vm_init_args(java_tool_options_args.get(),
4050 java_options_args.get(),
4051 args); // command line arguments
4052
4053 if (result != JNI_OK) {
4054 return result;
4055 }
4056
4057 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4058 SharedArchivePath = get_shared_archive_path();
4059 if (SharedArchivePath == NULL) {
4060 return JNI_ENOMEM;
4061 }
4062
4063 // Set up VerifySharedSpaces
4064 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4065 VerifySharedSpaces = true;
4066 }
4067
4068 // Delay warning until here so that we've had a chance to process
4069 // the -XX:-PrintWarnings flag
4070 if (needs_hotspotrc_warning) {
4071 warning("%s file is present but has been ignored. "
4072 "Run with -XX:Flags=%s to load the file.",
4073 hotspotrc, hotspotrc);
4074 }
4075
4076 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4077 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4078 #endif
4079
4080 ArgumentsExt::report_unsupported_options();
4081
4082 #ifndef PRODUCT
4083 if (TraceBytecodesAt != 0) {
4084 TraceBytecodes = true;
4085 }
4086 if (CountCompiledCalls) {
4087 if (UseCounterDecay) {
4088 warning("UseCounterDecay disabled because CountCalls is set");
4089 UseCounterDecay = false;
4090 }
4091 }
4092 #endif // PRODUCT
4093
4094 if (ScavengeRootsInCode == 0) {
4095 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4096 warning("Forcing ScavengeRootsInCode non-zero");
4097 }
4098 ScavengeRootsInCode = 1;
4099 }
4100
4101 // Set object alignment values.
4102 set_object_alignment();
4103
4104 #if !INCLUDE_ALL_GCS
4105 force_serial_gc();
4106 #endif // INCLUDE_ALL_GCS
4107 #if !INCLUDE_CDS
4108 if (DumpSharedSpaces || RequireSharedSpaces) {
4109 jio_fprintf(defaultStream::error_stream(),
4110 "Shared spaces are not supported in this VM\n");
4111 return JNI_ERR;
4112 }
4113 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4114 warning("Shared spaces are not supported in this VM");
4115 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4116 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4117 }
4118 no_shared_spaces("CDS Disabled");
4119 #endif // INCLUDE_CDS
4120
4121 return JNI_OK;
4122 }
4123
4124 jint Arguments::apply_ergo() {
4125
4126 // Set flags based on ergonomics.
4127 set_ergonomics_flags();
4128
4129 set_shared_spaces_flags();
4130
4131 // Check the GC selections again.
4132 if (!check_gc_consistency()) {
4133 return JNI_EINVAL;
4134 }
4135
4136 if (TieredCompilation) {
4137 set_tiered_flags();
4138 } else {
4139 int max_compilation_policy_choice = 1;
4140 #ifdef COMPILER2
4141 max_compilation_policy_choice = 2;
4142 #endif
4143 // Check if the policy is valid.
4144 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4145 vm_exit_during_initialization(
4146 "Incompatible compilation policy selected", NULL);
4147 }
4148 // Scale CompileThreshold
4149 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4150 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4151 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4152 }
4153 }
4154
4155 #ifdef COMPILER2
4156 #ifndef PRODUCT
4157 if (PrintIdealGraphLevel > 0) {
4158 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4159 }
4160 #endif
4161 #endif
4162
4163 // Set heap size based on available physical memory
4164 set_heap_size();
4165
4166 ArgumentsExt::set_gc_specific_flags();
4167
4168 // Initialize Metaspace flags and alignments
4169 Metaspace::ergo_initialize();
4170
4171 // Set bytecode rewriting flags
4172 set_bytecode_flags();
4173
4174 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4175 jint code = set_aggressive_opts_flags();
4176 if (code != JNI_OK) {
4177 return code;
4178 }
4179
4180 // Turn off biased locking for locking debug mode flags,
4181 // which are subtly different from each other but neither works with
4182 // biased locking
4183 if (UseHeavyMonitors
4184 #ifdef COMPILER1
4185 || !UseFastLocking
4186 #endif // COMPILER1
4187 #if INCLUDE_JVMCI
4188 || !JVMCIUseFastLocking
4189 #endif
4190 ) {
4191 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4192 // flag set to true on command line; warn the user that they
4193 // can't enable biased locking here
4194 warning("Biased Locking is not supported with locking debug flags"
4195 "; ignoring UseBiasedLocking flag." );
4196 }
4197 UseBiasedLocking = false;
4198 }
4199
4200 #ifdef CC_INTERP
4201 // Clear flags not supported on zero.
4202 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4203 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4204 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4205 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4206 #endif // CC_INTERP
4207
4208 #ifdef COMPILER2
4209 if (!EliminateLocks) {
4210 EliminateNestedLocks = false;
4211 }
4212 if (!Inline) {
4213 IncrementalInline = false;
4214 }
4215 #ifndef PRODUCT
4216 if (!IncrementalInline) {
4217 AlwaysIncrementalInline = false;
4218 }
4219 #endif
4220 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4221 // nothing to use the profiling, turn if off
4222 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4223 }
4224 #endif
4225
4226 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4227 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4228 DebugNonSafepoints = true;
4229 }
4230
4231 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4232 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4233 }
4234
4235 #ifndef PRODUCT
4236 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4237 if (use_vm_log()) {
4238 LogVMOutput = true;
4239 }
4240 }
4241 #endif // PRODUCT
4242
4243 if (PrintCommandLineFlags) {
4244 CommandLineFlags::printSetFlags(tty);
4245 }
4246
4247 // Apply CPU specific policy for the BiasedLocking
4248 if (UseBiasedLocking) {
4249 if (!VM_Version::use_biased_locking() &&
4250 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4251 UseBiasedLocking = false;
4252 }
4253 }
4254 #ifdef COMPILER2
4255 if (!UseBiasedLocking || EmitSync != 0) {
4256 UseOptoBiasInlining = false;
4257 }
4258 #endif
4259
4260 return JNI_OK;
4261 }
4262
4263 jint Arguments::adjust_after_os() {
4264 if (UseNUMA) {
4265 if (UseParallelGC || UseParallelOldGC) {
4266 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4267 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4268 }
4269 }
4270 // UseNUMAInterleaving is set to ON for all collectors and
4271 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4272 // such as the parallel collector for Linux and Solaris will
4273 // interleave old gen and survivor spaces on top of NUMA
4274 // allocation policy for the eden space.
4275 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4276 // all platforms and ParallelGC on Windows will interleave all
4277 // of the heap spaces across NUMA nodes.
4278 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4279 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4280 }
4281 }
4282 return JNI_OK;
4283 }
4284
4285 int Arguments::PropertyList_count(SystemProperty* pl) {
4286 int count = 0;
4287 while(pl != NULL) {
4288 count++;
4289 pl = pl->next();
4290 }
4291 return count;
4292 }
4293
4294 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4295 assert(key != NULL, "just checking");
4296 SystemProperty* prop;
4297 for (prop = pl; prop != NULL; prop = prop->next()) {
4298 if (strcmp(key, prop->key()) == 0) return prop->value();
4299 }
4300 return NULL;
4301 }
4302
4303 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4304 int count = 0;
4305 const char* ret_val = NULL;
4306
4307 while(pl != NULL) {
4308 if(count >= index) {
4309 ret_val = pl->key();
4310 break;
4311 }
4312 count++;
4313 pl = pl->next();
4314 }
4315
4316 return ret_val;
4317 }
4318
4319 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4320 int count = 0;
4321 char* ret_val = NULL;
4322
4323 while(pl != NULL) {
4324 if(count >= index) {
4325 ret_val = pl->value();
4326 break;
4327 }
4328 count++;
4329 pl = pl->next();
4330 }
4331
4332 return ret_val;
4333 }
4334
4335 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4336 SystemProperty* p = *plist;
4337 if (p == NULL) {
4338 *plist = new_p;
4339 } else {
4340 while (p->next() != NULL) {
4341 p = p->next();
4342 }
4343 p->set_next(new_p);
4344 }
4345 }
4346
4347 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4348 if (plist == NULL)
4349 return;
4350
4351 SystemProperty* new_p = new SystemProperty(k, v, true);
4352 PropertyList_add(plist, new_p);
4353 }
4354
4355 void Arguments::PropertyList_add(SystemProperty *element) {
4356 PropertyList_add(&_system_properties, element);
4357 }
4358
4359 // This add maintains unique property key in the list.
4360 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4361 if (plist == NULL)
4362 return;
4363
4364 // If property key exist then update with new value.
4365 SystemProperty* prop;
4366 for (prop = *plist; prop != NULL; prop = prop->next()) {
4367 if (strcmp(k, prop->key()) == 0) {
4368 if (append) {
4369 prop->append_value(v);
4370 } else {
4371 prop->set_value(v);
4372 }
4373 return;
4374 }
4375 }
4376
4377 PropertyList_add(plist, k, v);
4378 }
4379
4380 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4381 // Returns true if all of the source pointed by src has been copied over to
4382 // the destination buffer pointed by buf. Otherwise, returns false.
4383 // Notes:
4384 // 1. If the length (buflen) of the destination buffer excluding the
4385 // NULL terminator character is not long enough for holding the expanded
4386 // pid characters, it also returns false instead of returning the partially
4387 // expanded one.
4388 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4389 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4390 char* buf, size_t buflen) {
4391 const char* p = src;
4392 char* b = buf;
4393 const char* src_end = &src[srclen];
4394 char* buf_end = &buf[buflen - 1];
4395
4396 while (p < src_end && b < buf_end) {
4397 if (*p == '%') {
4398 switch (*(++p)) {
4399 case '%': // "%%" ==> "%"
4400 *b++ = *p++;
4401 break;
4402 case 'p': { // "%p" ==> current process id
4403 // buf_end points to the character before the last character so
4404 // that we could write '\0' to the end of the buffer.
4405 size_t buf_sz = buf_end - b + 1;
4406 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4407
4408 // if jio_snprintf fails or the buffer is not long enough to hold
4409 // the expanded pid, returns false.
4410 if (ret < 0 || ret >= (int)buf_sz) {
4411 return false;
4412 } else {
4413 b += ret;
4414 assert(*b == '\0', "fail in copy_expand_pid");
4415 if (p == src_end && b == buf_end + 1) {
4416 // reach the end of the buffer.
4417 return true;
4418 }
4419 }
4420 p++;
4421 break;
4422 }
4423 default :
4424 *b++ = '%';
4425 }
4426 } else {
4427 *b++ = *p++;
4428 }
4429 }
4430 *b = '\0';
4431 return (p == src_end); // return false if not all of the source was copied
4432 }