1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagWriteableList.hpp"
46 #include "runtime/commandLineFlagRangeList.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/globals_extension.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/os.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/defaultStream.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/stringUtils.hpp"
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciRuntime.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc/cms/compactibleFreeListSpace.hpp"
62 #include "gc/g1/g1CollectedHeap.inline.hpp"
63 #include "gc/parallel/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 char* Arguments::_jvm_flags_file = NULL;
71 char** Arguments::_jvm_flags_array = NULL;
72 int Arguments::_num_jvm_flags = 0;
73 char** Arguments::_jvm_args_array = NULL;
74 int Arguments::_num_jvm_args = 0;
75 char* Arguments::_java_command = NULL;
76 SystemProperty* Arguments::_system_properties = NULL;
77 const char* Arguments::_gc_log_filename = NULL;
78 bool Arguments::_has_profile = false;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 size_t Arguments::_min_heap_size = 0;
81 Arguments::Mode Arguments::_mode = _mixed;
82 bool Arguments::_java_compiler = false;
83 bool Arguments::_xdebug_mode = false;
84 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
85 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
86 int Arguments::_sun_java_launcher_pid = -1;
87 bool Arguments::_sun_java_launcher_is_altjvm = false;
88
89 // These parameters are reset in method parse_vm_init_args()
90 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
91 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
92 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
93 bool Arguments::_ClipInlining = ClipInlining;
94 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
95 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
96
97 char* Arguments::SharedArchivePath = NULL;
98
99 AgentLibraryList Arguments::_libraryList;
100 AgentLibraryList Arguments::_agentList;
101
102 abort_hook_t Arguments::_abort_hook = NULL;
103 exit_hook_t Arguments::_exit_hook = NULL;
104 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
105
106
107 SystemProperty *Arguments::_sun_boot_library_path = NULL;
108 SystemProperty *Arguments::_java_library_path = NULL;
109 SystemProperty *Arguments::_java_home = NULL;
110 SystemProperty *Arguments::_java_class_path = NULL;
111 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 size_t len = strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 // Return true if any of the strings in null-terminated array 'names' matches.
144 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
145 // the option must match exactly.
146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
147 bool tail_allowed) {
148 for (/* empty */; *names != NULL; ++names) {
149 if (match_option(option, *names, tail)) {
150 if (**tail == '\0' || tail_allowed && **tail == ':') {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
163
164 bool needs_module_property_warning = false;
165
166 #define MODULE_PROPERTY_PREFIX "jdk.module."
167 #define MODULE_PROPERTY_PREFIX_LEN 11
168 #define ADDEXPORTS "addexports"
169 #define ADDEXPORTS_LEN 10
170 #define ADDREADS "addreads"
171 #define ADDREADS_LEN 8
172 #define PATCH "patch"
173 #define PATCH_LEN 5
174 #define ADDMODS "addmods"
175 #define ADDMODS_LEN 7
176 #define LIMITMODS "limitmods"
177 #define LIMITMODS_LEN 9
178 #define PATH "path"
179 #define PATH_LEN 4
180 #define UPGRADE_PATH "upgrade.path"
181 #define UPGRADE_PATH_LEN 12
182
183 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
184 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
185 return ((strncmp(option, property, len) == 0) &&
186 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
187 }
188
189 // Return true if property starts with "jdk.module." and its ensuing chars match
190 // any of the reserved module properties.
191 // property should be passed without the leading "-D".
192 bool Arguments::is_internal_module_property(const char* property) {
193 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
194 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
195 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
196 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
197 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
198 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
199 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
200 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
201 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
202 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
203 return true;
204 }
205 }
206 return false;
207 }
208
209 // Process java launcher properties.
210 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
211 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
212 // sun.java.launcher.pid is defined.
213 // Must do this before setting up other system properties,
214 // as some of them may depend on launcher type.
215 for (int index = 0; index < args->nOptions; index++) {
216 const JavaVMOption* option = args->options + index;
217 const char* tail;
218
219 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
220 process_java_launcher_argument(tail, option->extraInfo);
221 continue;
222 }
223 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
224 if (strcmp(tail, "true") == 0) {
225 _sun_java_launcher_is_altjvm = true;
226 }
227 continue;
228 }
229 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
230 _sun_java_launcher_pid = atoi(tail);
231 continue;
232 }
233 }
234 }
235
236 // Initialize system properties key and value.
237 void Arguments::init_system_properties() {
238
239 // Set up _system_boot_class_path which is not a property but
240 // relies heavily on argument processing and the jdk.boot.class.path.append
241 // property. It is used to store the underlying system boot class path.
242 _system_boot_class_path = new PathString(NULL);
243
244 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
245 "Java Virtual Machine Specification", false));
246 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
249 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
250
251 // Following are JVMTI agent writable properties.
252 // Properties values are set to NULL and they are
253 // os specific they are initialized in os::init_system_properties_values().
254 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
255 _java_library_path = new SystemProperty("java.library.path", NULL, true);
256 _java_home = new SystemProperty("java.home", NULL, true);
257 _java_class_path = new SystemProperty("java.class.path", "", true);
258 // jdk.boot.class.path.append is a non-writeable, internal property.
259 // It can only be set by either:
260 // - -Xbootclasspath/a:
261 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
262 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
263
264 // Add to System Property list.
265 PropertyList_add(&_system_properties, _sun_boot_library_path);
266 PropertyList_add(&_system_properties, _java_library_path);
267 PropertyList_add(&_system_properties, _java_home);
268 PropertyList_add(&_system_properties, _java_class_path);
269 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
270
271 // Set OS specific system properties values
272 os::init_system_properties_values();
273 }
274
275 // Update/Initialize System properties after JDK version number is known
276 void Arguments::init_version_specific_system_properties() {
277 enum { bufsz = 16 };
278 char buffer[bufsz];
279 const char* spec_vendor = "Oracle Corporation";
280 uint32_t spec_version = JDK_Version::current().major_version();
281
282 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
283
284 PropertyList_add(&_system_properties,
285 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
286 PropertyList_add(&_system_properties,
287 new SystemProperty("java.vm.specification.version", buffer, false));
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
290 }
291
292 /*
293 * -XX argument processing:
294 *
295 * -XX arguments are defined in several places, such as:
296 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
297 * -XX arguments are parsed in parse_argument().
298 * -XX argument bounds checking is done in check_vm_args_consistency().
299 *
300 * Over time -XX arguments may change. There are mechanisms to handle common cases:
301 *
302 * ALIASED: An option that is simply another name for another option. This is often
303 * part of the process of deprecating a flag, but not all aliases need
304 * to be deprecated.
305 *
306 * Create an alias for an option by adding the old and new option names to the
307 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
308 *
309 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
310 * support may be removed in the future. Both regular and aliased options may be
311 * deprecated.
312 *
313 * Add a deprecation warning for an option (or alias) by adding an entry in the
314 * "special_jvm_flags" table and setting the "deprecated_in" field.
315 * Often an option "deprecated" in one major release will
316 * be made "obsolete" in the next. In this case the entry should also have it's
317 * "obsolete_in" field set.
318 *
319 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
320 * on the command line. A warning is printed to let the user know that option might not
321 * be accepted in the future.
322 *
323 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
324 * table and setting the "obsolete_in" field.
325 *
326 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
327 * to the current JDK version. The system will flatly refuse to admit the existence of
328 * the flag. This allows a flag to die automatically over JDK releases.
329 *
330 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
331 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
332 * - Newly obsolete or expired deprecated options should have their global variable
333 * definitions removed (from globals.hpp, etc) and related implementations removed.
334 *
335 * Recommended approach for removing options:
336 *
337 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
338 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
339 *
340 * To remove internal options (e.g. diagnostic, experimental, develop options), use
341 * a 2-step model adding major release numbers to the obsolete and expire columns.
342 *
343 * To change the name of an option, use the alias table as well as a 2-step
344 * model adding major release numbers to the deprecate and expire columns.
345 * Think twice about aliasing commonly used customer options.
346 *
347 * There are times when it is appropriate to leave a future release number as undefined.
348 *
349 * Tests: Aliases should be tested in VMAliasOptions.java.
350 * Deprecated options should be tested in VMDeprecatedOptions.java.
351 */
352
353 // Obsolete or deprecated -XX flag.
354 typedef struct {
355 const char* name;
356 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
357 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
358 JDK_Version expired_in; // When the option expires (or "undefined").
359 } SpecialFlag;
360
361 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
362 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
363 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
364 // the command-line as usual, but will issue a warning.
365 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
366 // the command-line, while issuing a warning and ignoring the flag value.
367 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
368 // existence of the flag.
369 //
370 // MANUAL CLEANUP ON JDK VERSION UPDATES:
371 // This table ensures that the handling of options will update automatically when the JDK
372 // version is incremented, but the source code needs to be cleanup up manually:
373 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
374 // variable should be removed, as well as users of the variable.
375 // - As "deprecated" options age into "obsolete" options, move the entry into the
376 // "Obsolete Flags" section of the table.
377 // - All expired options should be removed from the table.
378 static SpecialFlag const special_jvm_flags[] = {
379 // -------------- Deprecated Flags --------------
380 // --- Non-alias flags - sorted by obsolete_in then expired_in:
381 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
382 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
383 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
384 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
385
386 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
387 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
392 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
393 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
394
395 // -------------- Obsolete Flags - sorted by expired_in --------------
396 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 #ifndef ZERO
410 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 #endif // ZERO
413 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
422 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
423 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
424
425 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
426 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
427 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
428 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
429 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
430 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
431 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
432 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
433 #endif
434
435 { NULL, JDK_Version(0), JDK_Version(0) }
436 };
437
438 // Flags that are aliases for other flags.
439 typedef struct {
440 const char* alias_name;
441 const char* real_name;
442 } AliasedFlag;
443
444 static AliasedFlag const aliased_jvm_flags[] = {
445 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
446 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
447 { "CMSMarkStackSize", "MarkStackSize" },
448 { "G1MarkStackSize", "MarkStackSize" },
449 { "ParallelMarkingThreads", "ConcGCThreads" },
450 { "ParallelCMSThreads", "ConcGCThreads" },
451 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
452 { NULL, NULL}
453 };
454
455 // NOTE: A compatibility request will be necessary for each alias to be removed.
456 static AliasedLoggingFlag const aliased_logging_flags[] = {
457 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
458 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
459 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
460 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
461 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
462 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
463 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
464 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
465 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
466 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
467 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
468 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
469 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
470 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
471 };
472
473 #ifndef PRODUCT
474 // These options are removed in jdk9. Remove this code for jdk10.
475 static AliasedFlag const removed_develop_logging_flags[] = {
476 { "TraceClassInitialization", "-Xlog:class+init" },
477 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
478 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
479 { "TraceItables", "-Xlog:itables=debug" },
480 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
481 { "TraceSafepoint", "-Xlog:safepoint=debug" },
482 { "TraceStartupTime", "-Xlog:startuptime" },
483 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
484 { "PrintVtables", "-Xlog:vtables=debug" },
485 { "VerboseVerification", "-Xlog:verification" },
486 { NULL, NULL }
487 };
488 #endif //PRODUCT
489
490 // Return true if "v" is less than "other", where "other" may be "undefined".
491 static bool version_less_than(JDK_Version v, JDK_Version other) {
492 assert(!v.is_undefined(), "must be defined");
493 if (!other.is_undefined() && v.compare(other) >= 0) {
494 return false;
495 } else {
496 return true;
497 }
498 }
499
500 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
501 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
502 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
503 flag = special_jvm_flags[i];
504 return true;
505 }
506 }
507 return false;
508 }
509
510 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
511 assert(version != NULL, "Must provide a version buffer");
512 SpecialFlag flag;
513 if (lookup_special_flag(flag_name, flag)) {
514 if (!flag.obsolete_in.is_undefined()) {
515 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
516 *version = flag.obsolete_in;
517 return true;
518 }
519 }
520 }
521 return false;
522 }
523
524 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
525 assert(version != NULL, "Must provide a version buffer");
526 SpecialFlag flag;
527 if (lookup_special_flag(flag_name, flag)) {
528 if (!flag.deprecated_in.is_undefined()) {
529 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
530 version_less_than(JDK_Version::current(), flag.expired_in)) {
531 *version = flag.deprecated_in;
532 return 1;
533 } else {
534 return -1;
535 }
536 }
537 }
538 return 0;
539 }
540
541 #ifndef PRODUCT
542 const char* Arguments::removed_develop_logging_flag_name(const char* name){
543 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
544 const AliasedFlag& flag = removed_develop_logging_flags[i];
545 if (strcmp(flag.alias_name, name) == 0) {
546 return flag.real_name;
547 }
548 }
549 return NULL;
550 }
551 #endif // PRODUCT
552
553 const char* Arguments::real_flag_name(const char *flag_name) {
554 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
555 const AliasedFlag& flag_status = aliased_jvm_flags[i];
556 if (strcmp(flag_status.alias_name, flag_name) == 0) {
557 return flag_status.real_name;
558 }
559 }
560 return flag_name;
561 }
562
563 #ifdef ASSERT
564 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
565 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
566 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
567 return true;
568 }
569 }
570 return false;
571 }
572
573 static bool verify_special_jvm_flags() {
574 bool success = true;
575 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
576 const SpecialFlag& flag = special_jvm_flags[i];
577 if (lookup_special_flag(flag.name, i)) {
578 warning("Duplicate special flag declaration \"%s\"", flag.name);
579 success = false;
580 }
581 if (flag.deprecated_in.is_undefined() &&
582 flag.obsolete_in.is_undefined()) {
583 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
584 success = false;
585 }
586
587 if (!flag.deprecated_in.is_undefined()) {
588 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
589 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
590 success = false;
591 }
592
593 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
594 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
595 success = false;
596 }
597 }
598
599 if (!flag.obsolete_in.is_undefined()) {
600 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
601 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
602 success = false;
603 }
604
605 // if flag has become obsolete it should not have a "globals" flag defined anymore.
606 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
607 if (Flag::find_flag(flag.name) != NULL) {
608 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
609 success = false;
610 }
611 }
612 }
613
614 if (!flag.expired_in.is_undefined()) {
615 // if flag has become expired it should not have a "globals" flag defined anymore.
616 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
617 if (Flag::find_flag(flag.name) != NULL) {
618 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
619 success = false;
620 }
621 }
622 }
623
624 }
625 return success;
626 }
627 #endif
628
629 // Parses a size specification string.
630 bool Arguments::atojulong(const char *s, julong* result) {
631 julong n = 0;
632
633 // First char must be a digit. Don't allow negative numbers or leading spaces.
634 if (!isdigit(*s)) {
635 return false;
636 }
637
638 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
639 char* remainder;
640 errno = 0;
641 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
642 if (errno != 0) {
643 return false;
644 }
645
646 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
647 if (remainder == s || strlen(remainder) > 1) {
648 return false;
649 }
650
651 switch (*remainder) {
652 case 'T': case 't':
653 *result = n * G * K;
654 // Check for overflow.
655 if (*result/((julong)G * K) != n) return false;
656 return true;
657 case 'G': case 'g':
658 *result = n * G;
659 if (*result/G != n) return false;
660 return true;
661 case 'M': case 'm':
662 *result = n * M;
663 if (*result/M != n) return false;
664 return true;
665 case 'K': case 'k':
666 *result = n * K;
667 if (*result/K != n) return false;
668 return true;
669 case '\0':
670 *result = n;
671 return true;
672 default:
673 return false;
674 }
675 }
676
677 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
678 if (size < min_size) return arg_too_small;
679 // Check that size will fit in a size_t (only relevant on 32-bit)
680 if (size > max_uintx) return arg_too_big;
681 return arg_in_range;
682 }
683
684 // Describe an argument out of range error
685 void Arguments::describe_range_error(ArgsRange errcode) {
686 switch(errcode) {
687 case arg_too_big:
688 jio_fprintf(defaultStream::error_stream(),
689 "The specified size exceeds the maximum "
690 "representable size.\n");
691 break;
692 case arg_too_small:
693 case arg_unreadable:
694 case arg_in_range:
695 // do nothing for now
696 break;
697 default:
698 ShouldNotReachHere();
699 }
700 }
701
702 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
703 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
704 return true;
705 } else {
706 return false;
707 }
708 }
709
710 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
711 char* end;
712 errno = 0;
713 double v = strtod(value, &end);
714 if ((errno != 0) || (*end != 0)) {
715 return false;
716 }
717
718 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
719 return true;
720 }
721 return false;
722 }
723
724 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
725 julong v;
726 int int_v;
727 intx intx_v;
728 bool is_neg = false;
729 Flag* result = Flag::find_flag(name, strlen(name));
730
731 if (result == NULL) {
732 return false;
733 }
734
735 // Check the sign first since atojulong() parses only unsigned values.
736 if (*value == '-') {
737 if (!result->is_intx() && !result->is_int()) {
738 return false;
739 }
740 value++;
741 is_neg = true;
742 }
743 if (!Arguments::atojulong(value, &v)) {
744 return false;
745 }
746 if (result->is_int()) {
747 int_v = (int) v;
748 if (is_neg) {
749 int_v = -int_v;
750 }
751 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
752 } else if (result->is_uint()) {
753 uint uint_v = (uint) v;
754 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
755 } else if (result->is_intx()) {
756 intx_v = (intx) v;
757 if (is_neg) {
758 intx_v = -intx_v;
759 }
760 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
761 } else if (result->is_uintx()) {
762 uintx uintx_v = (uintx) v;
763 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
764 } else if (result->is_uint64_t()) {
765 uint64_t uint64_t_v = (uint64_t) v;
766 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
767 } else if (result->is_size_t()) {
768 size_t size_t_v = (size_t) v;
769 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
770 } else {
771 return false;
772 }
773 }
774
775 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
776 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
777 // Contract: CommandLineFlags always returns a pointer that needs freeing.
778 FREE_C_HEAP_ARRAY(char, value);
779 return true;
780 }
781
782 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
783 const char* old_value = "";
784 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
785 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
786 size_t new_len = strlen(new_value);
787 const char* value;
788 char* free_this_too = NULL;
789 if (old_len == 0) {
790 value = new_value;
791 } else if (new_len == 0) {
792 value = old_value;
793 } else {
794 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
795 // each new setting adds another LINE to the switch:
796 sprintf(buf, "%s\n%s", old_value, new_value);
797 value = buf;
798 free_this_too = buf;
799 }
800 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
801 // CommandLineFlags always returns a pointer that needs freeing.
802 FREE_C_HEAP_ARRAY(char, value);
803 if (free_this_too != NULL) {
804 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
805 FREE_C_HEAP_ARRAY(char, free_this_too);
806 }
807 return true;
808 }
809
810 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
811 const char* real_name = real_flag_name(arg);
812 JDK_Version since = JDK_Version();
813 switch (is_deprecated_flag(arg, &since)) {
814 case -1:
815 return NULL; // obsolete or expired, don't process normally
816 case 0:
817 return real_name;
818 case 1: {
819 if (warn) {
820 char version[256];
821 since.to_string(version, sizeof(version));
822 if (real_name != arg) {
823 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
824 arg, version, real_name);
825 } else {
826 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
827 arg, version);
828 }
829 }
830 return real_name;
831 }
832 }
833 ShouldNotReachHere();
834 return NULL;
835 }
836
837 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
838 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
839 // Set tagset string buffer at max size of 256, large enough for any alias tagset
840 const int max_tagset_size = 256;
841 int max_tagset_len = max_tagset_size - 1;
842 char tagset_buffer[max_tagset_size];
843 tagset_buffer[0] = '\0';
844
845 // Write tag-set for aliased logging option, in string list form
846 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
847 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
848 if (i > 0) {
849 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
850 }
851 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
852 }
853 if (!alf.exactMatch) {
854 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
855 }
856 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
857 (on) ? "+" : "-",
858 name,
859 tagset_buffer,
860 (on) ? LogLevel::name(alf.level) : "off");
861 }
862
863 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
864 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
865 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
866 if (strcmp(alf.alias_name, name) == 0) {
867 log_deprecated_flag(name, on, alf);
868 return alf;
869 }
870 }
871 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
872 return a;
873 }
874
875 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
876
877 // range of acceptable characters spelled out for portability reasons
878 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
879 #define BUFLEN 255
880 char name[BUFLEN+1];
881 char dummy;
882 const char* real_name;
883 bool warn_if_deprecated = true;
884
885 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
886 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
887 if (alf.alias_name != NULL){
888 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
889 return true;
890 }
891 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
892 if (real_name == NULL) {
893 return false;
894 }
895 return set_bool_flag(real_name, false, origin);
896 }
897 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
898 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
899 if (alf.alias_name != NULL){
900 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
901 return true;
902 }
903 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
904 if (real_name == NULL) {
905 return false;
906 }
907 return set_bool_flag(real_name, true, origin);
908 }
909
910 char punct;
911 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
912 const char* value = strchr(arg, '=') + 1;
913 Flag* flag;
914
915 // this scanf pattern matches both strings (handled here) and numbers (handled later))
916 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
917 if (alf.alias_name != NULL) {
918 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
919 return true;
920 }
921 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
922 if (real_name == NULL) {
923 return false;
924 }
925 flag = Flag::find_flag(real_name);
926 if (flag != NULL && flag->is_ccstr()) {
927 if (flag->ccstr_accumulates()) {
928 return append_to_string_flag(real_name, value, origin);
929 } else {
930 if (value[0] == '\0') {
931 value = NULL;
932 }
933 return set_string_flag(real_name, value, origin);
934 }
935 } else {
936 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
937 }
938 }
939
940 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
941 const char* value = strchr(arg, '=') + 1;
942 // -XX:Foo:=xxx will reset the string flag to the given value.
943 if (value[0] == '\0') {
944 value = NULL;
945 }
946 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
947 if (real_name == NULL) {
948 return false;
949 }
950 return set_string_flag(real_name, value, origin);
951 }
952
953 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
954 #define SIGNED_NUMBER_RANGE "[-0123456789]"
955 #define NUMBER_RANGE "[0123456789eE+-]"
956 char value[BUFLEN + 1];
957 char value2[BUFLEN + 1];
958 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
959 // Looks like a floating-point number -- try again with more lenient format string
960 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
961 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
962 if (real_name == NULL) {
963 return false;
964 }
965 return set_fp_numeric_flag(real_name, value, origin);
966 }
967 }
968
969 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
970 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
971 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
972 if (real_name == NULL) {
973 return false;
974 }
975 return set_numeric_flag(real_name, value, origin);
976 }
977
978 return false;
979 }
980
981 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
982 assert(bldarray != NULL, "illegal argument");
983
984 if (arg == NULL) {
985 return;
986 }
987
988 int new_count = *count + 1;
989
990 // expand the array and add arg to the last element
991 if (*bldarray == NULL) {
992 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
993 } else {
994 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
995 }
996 (*bldarray)[*count] = os::strdup_check_oom(arg);
997 *count = new_count;
998 }
999
1000 void Arguments::build_jvm_args(const char* arg) {
1001 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1002 }
1003
1004 void Arguments::build_jvm_flags(const char* arg) {
1005 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1006 }
1007
1008 // utility function to return a string that concatenates all
1009 // strings in a given char** array
1010 const char* Arguments::build_resource_string(char** args, int count) {
1011 if (args == NULL || count == 0) {
1012 return NULL;
1013 }
1014 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1015 for (int i = 1; i < count; i++) {
1016 length += strlen(args[i]) + 1; // add 1 for a space
1017 }
1018 char* s = NEW_RESOURCE_ARRAY(char, length);
1019 strcpy(s, args[0]);
1020 for (int j = 1; j < count; j++) {
1021 strcat(s, " ");
1022 strcat(s, args[j]);
1023 }
1024 return (const char*) s;
1025 }
1026
1027 void Arguments::print_on(outputStream* st) {
1028 st->print_cr("VM Arguments:");
1029 if (num_jvm_flags() > 0) {
1030 st->print("jvm_flags: "); print_jvm_flags_on(st);
1031 st->cr();
1032 }
1033 if (num_jvm_args() > 0) {
1034 st->print("jvm_args: "); print_jvm_args_on(st);
1035 st->cr();
1036 }
1037 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1038 if (_java_class_path != NULL) {
1039 char* path = _java_class_path->value();
1040 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1041 }
1042 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1043 }
1044
1045 void Arguments::print_summary_on(outputStream* st) {
1046 // Print the command line. Environment variables that are helpful for
1047 // reproducing the problem are written later in the hs_err file.
1048 // flags are from setting file
1049 if (num_jvm_flags() > 0) {
1050 st->print_raw("Settings File: ");
1051 print_jvm_flags_on(st);
1052 st->cr();
1053 }
1054 // args are the command line and environment variable arguments.
1055 st->print_raw("Command Line: ");
1056 if (num_jvm_args() > 0) {
1057 print_jvm_args_on(st);
1058 }
1059 // this is the classfile and any arguments to the java program
1060 if (java_command() != NULL) {
1061 st->print("%s", java_command());
1062 }
1063 st->cr();
1064 }
1065
1066 void Arguments::print_jvm_flags_on(outputStream* st) {
1067 if (_num_jvm_flags > 0) {
1068 for (int i=0; i < _num_jvm_flags; i++) {
1069 st->print("%s ", _jvm_flags_array[i]);
1070 }
1071 }
1072 }
1073
1074 void Arguments::print_jvm_args_on(outputStream* st) {
1075 if (_num_jvm_args > 0) {
1076 for (int i=0; i < _num_jvm_args; i++) {
1077 st->print("%s ", _jvm_args_array[i]);
1078 }
1079 }
1080 }
1081
1082 bool Arguments::process_argument(const char* arg,
1083 jboolean ignore_unrecognized,
1084 Flag::Flags origin) {
1085 JDK_Version since = JDK_Version();
1086
1087 if (parse_argument(arg, origin)) {
1088 return true;
1089 }
1090
1091 // Determine if the flag has '+', '-', or '=' characters.
1092 bool has_plus_minus = (*arg == '+' || *arg == '-');
1093 const char* const argname = has_plus_minus ? arg + 1 : arg;
1094
1095 size_t arg_len;
1096 const char* equal_sign = strchr(argname, '=');
1097 if (equal_sign == NULL) {
1098 arg_len = strlen(argname);
1099 } else {
1100 arg_len = equal_sign - argname;
1101 }
1102
1103 // Only make the obsolete check for valid arguments.
1104 if (arg_len <= BUFLEN) {
1105 // Construct a string which consists only of the argument name without '+', '-', or '='.
1106 char stripped_argname[BUFLEN+1];
1107 strncpy(stripped_argname, argname, arg_len);
1108 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1109 if (is_obsolete_flag(stripped_argname, &since)) {
1110 char version[256];
1111 since.to_string(version, sizeof(version));
1112 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1113 return true;
1114 }
1115 #ifndef PRODUCT
1116 else {
1117 const char* replacement;
1118 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1119 log_warning(arguments)("%s has been removed. Please use %s instead.",
1120 stripped_argname,
1121 replacement);
1122 return false;
1123 }
1124 }
1125 #endif //PRODUCT
1126 }
1127
1128 // For locked flags, report a custom error message if available.
1129 // Otherwise, report the standard unrecognized VM option.
1130 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1131 if (found_flag != NULL) {
1132 char locked_message_buf[BUFLEN];
1133 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1134 if (strlen(locked_message_buf) == 0) {
1135 if (found_flag->is_bool() && !has_plus_minus) {
1136 jio_fprintf(defaultStream::error_stream(),
1137 "Missing +/- setting for VM option '%s'\n", argname);
1138 } else if (!found_flag->is_bool() && has_plus_minus) {
1139 jio_fprintf(defaultStream::error_stream(),
1140 "Unexpected +/- setting in VM option '%s'\n", argname);
1141 } else {
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Improperly specified VM option '%s'\n", argname);
1144 }
1145 } else {
1146 #ifdef PRODUCT
1147 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1148 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1149 if (ignore_unrecognized && mismatched) {
1150 return true;
1151 }
1152 #endif
1153 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1154 }
1155 } else {
1156 if (ignore_unrecognized) {
1157 return true;
1158 }
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Unrecognized VM option '%s'\n", argname);
1161 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1162 if (fuzzy_matched != NULL) {
1163 jio_fprintf(defaultStream::error_stream(),
1164 "Did you mean '%s%s%s'? ",
1165 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1166 fuzzy_matched->_name,
1167 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1168 }
1169 }
1170
1171 // allow for commandline "commenting out" options like -XX:#+Verbose
1172 return arg[0] == '#';
1173 }
1174
1175 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1176 FILE* stream = fopen(file_name, "rb");
1177 if (stream == NULL) {
1178 if (should_exist) {
1179 jio_fprintf(defaultStream::error_stream(),
1180 "Could not open settings file %s\n", file_name);
1181 return false;
1182 } else {
1183 return true;
1184 }
1185 }
1186
1187 char token[1024];
1188 int pos = 0;
1189
1190 bool in_white_space = true;
1191 bool in_comment = false;
1192 bool in_quote = false;
1193 char quote_c = 0;
1194 bool result = true;
1195
1196 int c = getc(stream);
1197 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1198 if (in_white_space) {
1199 if (in_comment) {
1200 if (c == '\n') in_comment = false;
1201 } else {
1202 if (c == '#') in_comment = true;
1203 else if (!isspace(c)) {
1204 in_white_space = false;
1205 token[pos++] = c;
1206 }
1207 }
1208 } else {
1209 if (c == '\n' || (!in_quote && isspace(c))) {
1210 // token ends at newline, or at unquoted whitespace
1211 // this allows a way to include spaces in string-valued options
1212 token[pos] = '\0';
1213 logOption(token);
1214 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1215 build_jvm_flags(token);
1216 pos = 0;
1217 in_white_space = true;
1218 in_quote = false;
1219 } else if (!in_quote && (c == '\'' || c == '"')) {
1220 in_quote = true;
1221 quote_c = c;
1222 } else if (in_quote && (c == quote_c)) {
1223 in_quote = false;
1224 } else {
1225 token[pos++] = c;
1226 }
1227 }
1228 c = getc(stream);
1229 }
1230 if (pos > 0) {
1231 token[pos] = '\0';
1232 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1233 build_jvm_flags(token);
1234 }
1235 fclose(stream);
1236 return result;
1237 }
1238
1239 //=============================================================================================================
1240 // Parsing of properties (-D)
1241
1242 const char* Arguments::get_property(const char* key) {
1243 return PropertyList_get_value(system_properties(), key);
1244 }
1245
1246 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1247 const char* eq = strchr(prop, '=');
1248 const char* key;
1249 const char* value = "";
1250
1251 if (eq == NULL) {
1252 // property doesn't have a value, thus use passed string
1253 key = prop;
1254 } else {
1255 // property have a value, thus extract it and save to the
1256 // allocated string
1257 size_t key_len = eq - prop;
1258 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1259
1260 strncpy(tmp_key, prop, key_len);
1261 tmp_key[key_len] = '\0';
1262 key = tmp_key;
1263
1264 value = &prop[key_len + 1];
1265 }
1266
1267 if (strcmp(key, "java.compiler") == 0) {
1268 process_java_compiler_argument(value);
1269 // Record value in Arguments, but let it get passed to Java.
1270 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1271 strcmp(key, "sun.java.launcher.pid") == 0) {
1272 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1273 // private and are processed in process_sun_java_launcher_properties();
1274 // the sun.java.launcher property is passed on to the java application
1275 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1276 // append is true, writable is true, internal is false
1277 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1278 WriteableProperty, ExternalProperty);
1279 } else {
1280 if (strcmp(key, "sun.java.command") == 0) {
1281 char *old_java_command = _java_command;
1282 _java_command = os::strdup_check_oom(value, mtArguments);
1283 if (old_java_command != NULL) {
1284 os::free(old_java_command);
1285 }
1286 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1287 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1288 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1289 // its value without going through the property list or making a Java call.
1290 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1291 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1292 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1293 os::free((void *)old_java_vendor_url_bug);
1294 }
1295 }
1296
1297 // Create new property and add at the end of the list
1298 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1299 }
1300
1301 if (key != prop) {
1302 // SystemProperty copy passed value, thus free previously allocated
1303 // memory
1304 FreeHeap((void *)key);
1305 }
1306
1307 return true;
1308 }
1309
1310 // sets or adds a module name to the jdk.module.addmods property
1311 bool Arguments::append_to_addmods_property(const char* module_name) {
1312 const char* key = "jdk.module.addmods";
1313 const char* old_value = Arguments::get_property(key);
1314 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1315 if (old_value != NULL) {
1316 buf_len += strlen(old_value) + 1;
1317 }
1318 char* new_value = AllocateHeap(buf_len, mtArguments);
1319 if (new_value == NULL) {
1320 return false;
1321 }
1322 if (old_value == NULL) {
1323 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1324 } else {
1325 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1326 }
1327 bool added = add_property(new_value, UnwriteableProperty, InternalProperty);
1328 FreeHeap(new_value);
1329 return added;
1330 }
1331
1332 #if INCLUDE_CDS
1333 void Arguments::check_unsupported_dumping_properties() {
1334 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1335 const char* unsupported_properties[5] = { "jdk.module.main",
1336 "jdk.module.path",
1337 "jdk.module.upgrade.path",
1338 "jdk.module.addmods",
1339 "jdk.module.limitmods" };
1340 const char* unsupported_options[5] = { "-m",
1341 "--module-path",
1342 "--upgrade-module-path",
1343 "--add-modules",
1344 "--limit-modules" };
1345 SystemProperty* sp = system_properties();
1346 while (sp != NULL) {
1347 for (int i = 0; i < 5; i++) {
1348 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1349 vm_exit_during_initialization(
1350 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1351 }
1352 }
1353 sp = sp->next();
1354 }
1355
1356 // Check for an exploded module build in use with -Xshare:dump.
1357 if (!has_jimage()) {
1358 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1359 }
1360 }
1361 #endif
1362
1363 //===========================================================================================================
1364 // Setting int/mixed/comp mode flags
1365
1366 void Arguments::set_mode_flags(Mode mode) {
1367 // Set up default values for all flags.
1368 // If you add a flag to any of the branches below,
1369 // add a default value for it here.
1370 set_java_compiler(false);
1371 _mode = mode;
1372
1373 // Ensure Agent_OnLoad has the correct initial values.
1374 // This may not be the final mode; mode may change later in onload phase.
1375 PropertyList_unique_add(&_system_properties, "java.vm.info",
1376 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1377
1378 UseInterpreter = true;
1379 UseCompiler = true;
1380 UseLoopCounter = true;
1381
1382 // Default values may be platform/compiler dependent -
1383 // use the saved values
1384 ClipInlining = Arguments::_ClipInlining;
1385 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1386 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1387 BackgroundCompilation = Arguments::_BackgroundCompilation;
1388 if (TieredCompilation) {
1389 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1390 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1391 }
1392 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1393 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1394 }
1395 }
1396
1397 // Change from defaults based on mode
1398 switch (mode) {
1399 default:
1400 ShouldNotReachHere();
1401 break;
1402 case _int:
1403 UseCompiler = false;
1404 UseLoopCounter = false;
1405 AlwaysCompileLoopMethods = false;
1406 UseOnStackReplacement = false;
1407 break;
1408 case _mixed:
1409 // same as default
1410 break;
1411 case _comp:
1412 UseInterpreter = false;
1413 BackgroundCompilation = false;
1414 ClipInlining = false;
1415 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1416 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1417 // compile a level 4 (C2) and then continue executing it.
1418 if (TieredCompilation) {
1419 Tier3InvokeNotifyFreqLog = 0;
1420 Tier4InvocationThreshold = 0;
1421 }
1422 break;
1423 }
1424 }
1425
1426 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1427 // Conflict: required to use shared spaces (-Xshare:on), but
1428 // incompatible command line options were chosen.
1429
1430 static void no_shared_spaces(const char* message) {
1431 if (RequireSharedSpaces) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "Class data sharing is inconsistent with other specified options.\n");
1434 vm_exit_during_initialization("Unable to use shared archive.", message);
1435 } else {
1436 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1437 }
1438 }
1439 #endif
1440
1441 // Returns threshold scaled with the value of scale.
1442 // If scale < 0.0, threshold is returned without scaling.
1443 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1444 if (scale == 1.0 || scale < 0.0) {
1445 return threshold;
1446 } else {
1447 return (intx)(threshold * scale);
1448 }
1449 }
1450
1451 // Returns freq_log scaled with the value of scale.
1452 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1453 // If scale < 0.0, freq_log is returned without scaling.
1454 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1455 // Check if scaling is necessary or if negative value was specified.
1456 if (scale == 1.0 || scale < 0.0) {
1457 return freq_log;
1458 }
1459 // Check values to avoid calculating log2 of 0.
1460 if (scale == 0.0 || freq_log == 0) {
1461 return 0;
1462 }
1463 // Determine the maximum notification frequency value currently supported.
1464 // The largest mask value that the interpreter/C1 can handle is
1465 // of length InvocationCounter::number_of_count_bits. Mask values are always
1466 // one bit shorter then the value of the notification frequency. Set
1467 // max_freq_bits accordingly.
1468 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1469 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1470 if (scaled_freq == 0) {
1471 // Return 0 right away to avoid calculating log2 of 0.
1472 return 0;
1473 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1474 return max_freq_bits;
1475 } else {
1476 return log2_intptr(scaled_freq);
1477 }
1478 }
1479
1480 void Arguments::set_tiered_flags() {
1481 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1482 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1483 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1484 }
1485 if (CompilationPolicyChoice < 2) {
1486 vm_exit_during_initialization(
1487 "Incompatible compilation policy selected", NULL);
1488 }
1489 // Increase the code cache size - tiered compiles a lot more.
1490 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1491 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1492 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1493 }
1494 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1495 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1496 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1497 }
1498 if (!UseInterpreter) { // -Xcomp
1499 Tier3InvokeNotifyFreqLog = 0;
1500 Tier4InvocationThreshold = 0;
1501 }
1502
1503 if (CompileThresholdScaling < 0) {
1504 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1505 }
1506
1507 // Scale tiered compilation thresholds.
1508 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1509 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1510 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1511 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1512
1513 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1514 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1515 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1516 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1517
1518 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1519 // once these thresholds become supported.
1520
1521 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1522 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1523
1524 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1525 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1526
1527 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1528
1529 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1530 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1531 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1532 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1533 }
1534 }
1535
1536 #if INCLUDE_ALL_GCS
1537 static void disable_adaptive_size_policy(const char* collector_name) {
1538 if (UseAdaptiveSizePolicy) {
1539 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1540 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1541 collector_name);
1542 }
1543 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1544 }
1545 }
1546
1547 void Arguments::set_parnew_gc_flags() {
1548 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1549 "control point invariant");
1550 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1551 assert(UseParNewGC, "ParNew should always be used with CMS");
1552
1553 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1554 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1555 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1556 } else if (ParallelGCThreads == 0) {
1557 jio_fprintf(defaultStream::error_stream(),
1558 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1559 vm_exit(1);
1560 }
1561
1562 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1563 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1564 // we set them to 1024 and 1024.
1565 // See CR 6362902.
1566 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1567 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1568 }
1569 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1570 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1571 }
1572
1573 // When using compressed oops, we use local overflow stacks,
1574 // rather than using a global overflow list chained through
1575 // the klass word of the object's pre-image.
1576 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1577 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1578 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1579 }
1580 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1581 }
1582 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1583 }
1584
1585 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1586 // sparc/solaris for certain applications, but would gain from
1587 // further optimization and tuning efforts, and would almost
1588 // certainly gain from analysis of platform and environment.
1589 void Arguments::set_cms_and_parnew_gc_flags() {
1590 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1591 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1592 assert(UseParNewGC, "ParNew should always be used with CMS");
1593
1594 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1595 disable_adaptive_size_policy("UseConcMarkSweepGC");
1596
1597 set_parnew_gc_flags();
1598
1599 size_t max_heap = align_size_down(MaxHeapSize,
1600 CardTableRS::ct_max_alignment_constraint());
1601
1602 // Now make adjustments for CMS
1603 intx tenuring_default = (intx)6;
1604 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1605
1606 // Preferred young gen size for "short" pauses:
1607 // upper bound depends on # of threads and NewRatio.
1608 const size_t preferred_max_new_size_unaligned =
1609 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1610 size_t preferred_max_new_size =
1611 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1612
1613 // Unless explicitly requested otherwise, size young gen
1614 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1615
1616 // If either MaxNewSize or NewRatio is set on the command line,
1617 // assume the user is trying to set the size of the young gen.
1618 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1619
1620 // Set MaxNewSize to our calculated preferred_max_new_size unless
1621 // NewSize was set on the command line and it is larger than
1622 // preferred_max_new_size.
1623 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1624 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1625 } else {
1626 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1627 }
1628 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1629
1630 // Code along this path potentially sets NewSize and OldSize
1631 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1632 min_heap_size(), InitialHeapSize, max_heap);
1633 size_t min_new = preferred_max_new_size;
1634 if (FLAG_IS_CMDLINE(NewSize)) {
1635 min_new = NewSize;
1636 }
1637 if (max_heap > min_new && min_heap_size() > min_new) {
1638 // Unless explicitly requested otherwise, make young gen
1639 // at least min_new, and at most preferred_max_new_size.
1640 if (FLAG_IS_DEFAULT(NewSize)) {
1641 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1642 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1643 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1644 }
1645 // Unless explicitly requested otherwise, size old gen
1646 // so it's NewRatio x of NewSize.
1647 if (FLAG_IS_DEFAULT(OldSize)) {
1648 if (max_heap > NewSize) {
1649 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1650 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1651 }
1652 }
1653 }
1654 }
1655 // Unless explicitly requested otherwise, definitely
1656 // promote all objects surviving "tenuring_default" scavenges.
1657 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1658 FLAG_IS_DEFAULT(SurvivorRatio)) {
1659 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1660 }
1661 // If we decided above (or user explicitly requested)
1662 // `promote all' (via MaxTenuringThreshold := 0),
1663 // prefer minuscule survivor spaces so as not to waste
1664 // space for (non-existent) survivors
1665 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1666 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1667 }
1668
1669 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1670 // but rather the number of free blocks of a given size that are used when
1671 // replenishing the local per-worker free list caches.
1672 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1673 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1674 // OldPLAB sizing manually turned off: Use a larger default setting,
1675 // unless it was manually specified. This is because a too-low value
1676 // will slow down scavenges.
1677 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1678 } else {
1679 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1680 }
1681 }
1682
1683 // If either of the static initialization defaults have changed, note this
1684 // modification.
1685 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1686 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1687 }
1688
1689 if (!ClassUnloading) {
1690 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1691 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1692 }
1693
1694 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1695 }
1696 #endif // INCLUDE_ALL_GCS
1697
1698 void set_object_alignment() {
1699 // Object alignment.
1700 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1701 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1702 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1703 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1704 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1705 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1706
1707 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1708 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1709
1710 // Oop encoding heap max
1711 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1712
1713 if (SurvivorAlignmentInBytes == 0) {
1714 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1715 }
1716
1717 #if INCLUDE_ALL_GCS
1718 // Set CMS global values
1719 CompactibleFreeListSpace::set_cms_values();
1720 #endif // INCLUDE_ALL_GCS
1721 }
1722
1723 size_t Arguments::max_heap_for_compressed_oops() {
1724 // Avoid sign flip.
1725 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1726 // We need to fit both the NULL page and the heap into the memory budget, while
1727 // keeping alignment constraints of the heap. To guarantee the latter, as the
1728 // NULL page is located before the heap, we pad the NULL page to the conservative
1729 // maximum alignment that the GC may ever impose upon the heap.
1730 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1731 _conservative_max_heap_alignment);
1732
1733 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1734 NOT_LP64(ShouldNotReachHere(); return 0);
1735 }
1736
1737 bool Arguments::should_auto_select_low_pause_collector() {
1738 if (UseAutoGCSelectPolicy &&
1739 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1740 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1741 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1742 return true;
1743 }
1744 return false;
1745 }
1746
1747 void Arguments::set_use_compressed_oops() {
1748 #ifndef ZERO
1749 #ifdef _LP64
1750 // MaxHeapSize is not set up properly at this point, but
1751 // the only value that can override MaxHeapSize if we are
1752 // to use UseCompressedOops is InitialHeapSize.
1753 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1754
1755 if (max_heap_size <= max_heap_for_compressed_oops()) {
1756 #if !defined(COMPILER1) || defined(TIERED)
1757 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1758 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1759 }
1760 #endif
1761 } else {
1762 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1763 warning("Max heap size too large for Compressed Oops");
1764 FLAG_SET_DEFAULT(UseCompressedOops, false);
1765 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1766 }
1767 }
1768 #endif // _LP64
1769 #endif // ZERO
1770 }
1771
1772
1773 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1774 // set_use_compressed_oops().
1775 void Arguments::set_use_compressed_klass_ptrs() {
1776 #ifndef ZERO
1777 #ifdef _LP64
1778 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1779 if (!UseCompressedOops) {
1780 if (UseCompressedClassPointers) {
1781 warning("UseCompressedClassPointers requires UseCompressedOops");
1782 }
1783 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1784 } else {
1785 // Turn on UseCompressedClassPointers too
1786 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1787 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1788 }
1789 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1790 if (UseCompressedClassPointers) {
1791 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1792 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1793 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1794 }
1795 }
1796 }
1797 #endif // _LP64
1798 #endif // !ZERO
1799 }
1800
1801 void Arguments::set_conservative_max_heap_alignment() {
1802 // The conservative maximum required alignment for the heap is the maximum of
1803 // the alignments imposed by several sources: any requirements from the heap
1804 // itself, the collector policy and the maximum page size we may run the VM
1805 // with.
1806 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1807 #if INCLUDE_ALL_GCS
1808 if (UseParallelGC) {
1809 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1810 } else if (UseG1GC) {
1811 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1812 }
1813 #endif // INCLUDE_ALL_GCS
1814 _conservative_max_heap_alignment = MAX4(heap_alignment,
1815 (size_t)os::vm_allocation_granularity(),
1816 os::max_page_size(),
1817 CollectorPolicy::compute_heap_alignment());
1818 }
1819
1820 bool Arguments::gc_selected() {
1821 #if INCLUDE_ALL_GCS
1822 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1823 #else
1824 return UseSerialGC;
1825 #endif // INCLUDE_ALL_GCS
1826 }
1827
1828 void Arguments::select_gc_ergonomically() {
1829 #if INCLUDE_ALL_GCS
1830 if (os::is_server_class_machine()) {
1831 if (should_auto_select_low_pause_collector()) {
1832 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1833 } else {
1834 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1835 }
1836 } else {
1837 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1838 }
1839 #else
1840 UNSUPPORTED_OPTION(UseG1GC);
1841 UNSUPPORTED_OPTION(UseParallelGC);
1842 UNSUPPORTED_OPTION(UseParallelOldGC);
1843 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1844 UNSUPPORTED_OPTION(UseParNewGC);
1845 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1846 #endif // INCLUDE_ALL_GCS
1847 }
1848
1849 void Arguments::select_gc() {
1850 if (!gc_selected()) {
1851 select_gc_ergonomically();
1852 if (!gc_selected()) {
1853 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1854 }
1855 }
1856 }
1857
1858 void Arguments::set_ergonomics_flags() {
1859 select_gc();
1860
1861 #if defined(COMPILER2) || INCLUDE_JVMCI
1862 // Shared spaces work fine with other GCs but causes bytecode rewriting
1863 // to be disabled, which hurts interpreter performance and decreases
1864 // server performance. When -server is specified, keep the default off
1865 // unless it is asked for. Future work: either add bytecode rewriting
1866 // at link time, or rewrite bytecodes in non-shared methods.
1867 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1868 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1869 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1870 }
1871 #endif
1872
1873 set_conservative_max_heap_alignment();
1874
1875 #ifndef ZERO
1876 #ifdef _LP64
1877 set_use_compressed_oops();
1878
1879 // set_use_compressed_klass_ptrs() must be called after calling
1880 // set_use_compressed_oops().
1881 set_use_compressed_klass_ptrs();
1882
1883 // Also checks that certain machines are slower with compressed oops
1884 // in vm_version initialization code.
1885 #endif // _LP64
1886 #endif // !ZERO
1887
1888 CodeCacheExtensions::set_ergonomics_flags();
1889 }
1890
1891 void Arguments::set_parallel_gc_flags() {
1892 assert(UseParallelGC || UseParallelOldGC, "Error");
1893 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1894 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1895 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1896 }
1897 FLAG_SET_DEFAULT(UseParallelGC, true);
1898
1899 // If no heap maximum was requested explicitly, use some reasonable fraction
1900 // of the physical memory, up to a maximum of 1GB.
1901 FLAG_SET_DEFAULT(ParallelGCThreads,
1902 Abstract_VM_Version::parallel_worker_threads());
1903 if (ParallelGCThreads == 0) {
1904 jio_fprintf(defaultStream::error_stream(),
1905 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1906 vm_exit(1);
1907 }
1908
1909 if (UseAdaptiveSizePolicy) {
1910 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1911 // unless the user actually sets these flags.
1912 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1913 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1914 }
1915 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1916 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1917 }
1918 }
1919
1920 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1921 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1922 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1923 // See CR 6362902 for details.
1924 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1925 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1926 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1927 }
1928 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1929 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1930 }
1931 }
1932
1933 if (UseParallelOldGC) {
1934 // Par compact uses lower default values since they are treated as
1935 // minimums. These are different defaults because of the different
1936 // interpretation and are not ergonomically set.
1937 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1938 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1939 }
1940 }
1941 }
1942
1943 void Arguments::set_g1_gc_flags() {
1944 assert(UseG1GC, "Error");
1945 #if defined(COMPILER1) || INCLUDE_JVMCI
1946 FastTLABRefill = false;
1947 #endif
1948 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1949 if (ParallelGCThreads == 0) {
1950 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1951 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1952 }
1953
1954 #if INCLUDE_ALL_GCS
1955 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1956 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1957 }
1958 #endif
1959
1960 // MarkStackSize will be set (if it hasn't been set by the user)
1961 // when concurrent marking is initialized.
1962 // Its value will be based upon the number of parallel marking threads.
1963 // But we do set the maximum mark stack size here.
1964 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1965 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1966 }
1967
1968 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1969 // In G1, we want the default GC overhead goal to be higher than
1970 // it is for PS, or the heap might be expanded too aggressively.
1971 // We set it here to ~8%.
1972 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1973 }
1974
1975 // Below, we might need to calculate the pause time interval based on
1976 // the pause target. When we do so we are going to give G1 maximum
1977 // flexibility and allow it to do pauses when it needs to. So, we'll
1978 // arrange that the pause interval to be pause time target + 1 to
1979 // ensure that a) the pause time target is maximized with respect to
1980 // the pause interval and b) we maintain the invariant that pause
1981 // time target < pause interval. If the user does not want this
1982 // maximum flexibility, they will have to set the pause interval
1983 // explicitly.
1984
1985 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1986 // The default pause time target in G1 is 200ms
1987 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1988 }
1989
1990 // Then, if the interval parameter was not set, set it according to
1991 // the pause time target (this will also deal with the case when the
1992 // pause time target is the default value).
1993 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1994 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1995 }
1996
1997 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1998 }
1999
2000 void Arguments::set_gc_specific_flags() {
2001 #if INCLUDE_ALL_GCS
2002 // Set per-collector flags
2003 if (UseParallelGC || UseParallelOldGC) {
2004 set_parallel_gc_flags();
2005 } else if (UseConcMarkSweepGC) {
2006 set_cms_and_parnew_gc_flags();
2007 } else if (UseG1GC) {
2008 set_g1_gc_flags();
2009 }
2010 if (AssumeMP && !UseSerialGC) {
2011 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2012 warning("If the number of processors is expected to increase from one, then"
2013 " you should configure the number of parallel GC threads appropriately"
2014 " using -XX:ParallelGCThreads=N");
2015 }
2016 }
2017 if (MinHeapFreeRatio == 100) {
2018 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2019 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2020 }
2021 #endif // INCLUDE_ALL_GCS
2022 }
2023
2024 julong Arguments::limit_by_allocatable_memory(julong limit) {
2025 julong max_allocatable;
2026 julong result = limit;
2027 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2028 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2029 }
2030 return result;
2031 }
2032
2033 // Use static initialization to get the default before parsing
2034 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2035
2036 void Arguments::set_heap_size() {
2037 const julong phys_mem =
2038 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2039 : (julong)MaxRAM;
2040
2041 // If the maximum heap size has not been set with -Xmx,
2042 // then set it as fraction of the size of physical memory,
2043 // respecting the maximum and minimum sizes of the heap.
2044 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2045 julong reasonable_max = phys_mem / MaxRAMFraction;
2046
2047 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2048 // Small physical memory, so use a minimum fraction of it for the heap
2049 reasonable_max = phys_mem / MinRAMFraction;
2050 } else {
2051 // Not-small physical memory, so require a heap at least
2052 // as large as MaxHeapSize
2053 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2054 }
2055 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2056 // Limit the heap size to ErgoHeapSizeLimit
2057 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2058 }
2059 if (UseCompressedOops) {
2060 // Limit the heap size to the maximum possible when using compressed oops
2061 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2062
2063 // HeapBaseMinAddress can be greater than default but not less than.
2064 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2065 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2066 // matches compressed oops printing flags
2067 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2068 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2069 DefaultHeapBaseMinAddress,
2070 DefaultHeapBaseMinAddress/G,
2071 HeapBaseMinAddress);
2072 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2073 }
2074 }
2075
2076 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2077 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2078 // but it should be not less than default MaxHeapSize.
2079 max_coop_heap -= HeapBaseMinAddress;
2080 }
2081 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2082 }
2083 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2084
2085 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2086 // An initial heap size was specified on the command line,
2087 // so be sure that the maximum size is consistent. Done
2088 // after call to limit_by_allocatable_memory because that
2089 // method might reduce the allocation size.
2090 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2091 }
2092
2093 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2094 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2095 }
2096
2097 // If the minimum or initial heap_size have not been set or requested to be set
2098 // ergonomically, set them accordingly.
2099 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2100 julong reasonable_minimum = (julong)(OldSize + NewSize);
2101
2102 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2103
2104 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2105
2106 if (InitialHeapSize == 0) {
2107 julong reasonable_initial = phys_mem / InitialRAMFraction;
2108
2109 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2110 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2111
2112 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2113
2114 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2115 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2116 }
2117 // If the minimum heap size has not been set (via -Xms),
2118 // synchronize with InitialHeapSize to avoid errors with the default value.
2119 if (min_heap_size() == 0) {
2120 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2121 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2122 }
2123 }
2124 }
2125
2126 // This option inspects the machine and attempts to set various
2127 // parameters to be optimal for long-running, memory allocation
2128 // intensive jobs. It is intended for machines with large
2129 // amounts of cpu and memory.
2130 jint Arguments::set_aggressive_heap_flags() {
2131 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2132 // VM, but we may not be able to represent the total physical memory
2133 // available (like having 8gb of memory on a box but using a 32bit VM).
2134 // Thus, we need to make sure we're using a julong for intermediate
2135 // calculations.
2136 julong initHeapSize;
2137 julong total_memory = os::physical_memory();
2138
2139 if (total_memory < (julong) 256 * M) {
2140 jio_fprintf(defaultStream::error_stream(),
2141 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2142 vm_exit(1);
2143 }
2144
2145 // The heap size is half of available memory, or (at most)
2146 // all of possible memory less 160mb (leaving room for the OS
2147 // when using ISM). This is the maximum; because adaptive sizing
2148 // is turned on below, the actual space used may be smaller.
2149
2150 initHeapSize = MIN2(total_memory / (julong) 2,
2151 total_memory - (julong) 160 * M);
2152
2153 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2154
2155 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2156 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2157 return JNI_EINVAL;
2158 }
2159 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 // Currently the minimum size and the initial heap sizes are the same.
2163 set_min_heap_size(initHeapSize);
2164 }
2165 if (FLAG_IS_DEFAULT(NewSize)) {
2166 // Make the young generation 3/8ths of the total heap.
2167 if (FLAG_SET_CMDLINE(size_t, NewSize,
2168 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2169 return JNI_EINVAL;
2170 }
2171 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 }
2175
2176 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2177 FLAG_SET_DEFAULT(UseLargePages, true);
2178 #endif
2179
2180 // Increase some data structure sizes for efficiency
2181 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2185 return JNI_EINVAL;
2186 }
2187 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190
2191 // See the OldPLABSize comment below, but replace 'after promotion'
2192 // with 'after copying'. YoungPLABSize is the size of the survivor
2193 // space per-gc-thread buffers. The default is 4kw.
2194 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2195 return JNI_EINVAL;
2196 }
2197
2198 // OldPLABSize is the size of the buffers in the old gen that
2199 // UseParallelGC uses to promote live data that doesn't fit in the
2200 // survivor spaces. At any given time, there's one for each gc thread.
2201 // The default size is 1kw. These buffers are rarely used, since the
2202 // survivor spaces are usually big enough. For specjbb, however, there
2203 // are occasions when there's lots of live data in the young gen
2204 // and we end up promoting some of it. We don't have a definite
2205 // explanation for why bumping OldPLABSize helps, but the theory
2206 // is that a bigger PLAB results in retaining something like the
2207 // original allocation order after promotion, which improves mutator
2208 // locality. A minor effect may be that larger PLABs reduce the
2209 // number of PLAB allocation events during gc. The value of 8kw
2210 // was arrived at by experimenting with specjbb.
2211 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2212 return JNI_EINVAL;
2213 }
2214
2215 // Enable parallel GC and adaptive generation sizing
2216 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2217 return JNI_EINVAL;
2218 }
2219 FLAG_SET_DEFAULT(ParallelGCThreads,
2220 Abstract_VM_Version::parallel_worker_threads());
2221
2222 // Encourage steady state memory management
2223 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2224 return JNI_EINVAL;
2225 }
2226
2227 // This appears to improve mutator locality
2228 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231
2232 // Get around early Solaris scheduling bug
2233 // (affinity vs other jobs on system)
2234 // but disallow DR and offlining (5008695).
2235 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2236 return JNI_EINVAL;
2237 }
2238
2239 return JNI_OK;
2240 }
2241
2242 // This must be called after ergonomics.
2243 void Arguments::set_bytecode_flags() {
2244 if (!RewriteBytecodes) {
2245 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2246 }
2247 }
2248
2249 // Aggressive optimization flags -XX:+AggressiveOpts
2250 jint Arguments::set_aggressive_opts_flags() {
2251 #ifdef COMPILER2
2252 if (AggressiveUnboxing) {
2253 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2254 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2255 } else if (!EliminateAutoBox) {
2256 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2257 AggressiveUnboxing = false;
2258 }
2259 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2260 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2261 } else if (!DoEscapeAnalysis) {
2262 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2263 AggressiveUnboxing = false;
2264 }
2265 }
2266 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2267 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2268 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2269 }
2270 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2271 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2272 }
2273
2274 // Feed the cache size setting into the JDK
2275 char buffer[1024];
2276 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2277 if (!add_property(buffer)) {
2278 return JNI_ENOMEM;
2279 }
2280 }
2281 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2282 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2283 }
2284 #endif
2285
2286 if (AggressiveOpts) {
2287 // Sample flag setting code
2288 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2289 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2290 // }
2291 }
2292
2293 return JNI_OK;
2294 }
2295
2296 //===========================================================================================================
2297 // Parsing of java.compiler property
2298
2299 void Arguments::process_java_compiler_argument(const char* arg) {
2300 // For backwards compatibility, Djava.compiler=NONE or ""
2301 // causes us to switch to -Xint mode UNLESS -Xdebug
2302 // is also specified.
2303 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2304 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2305 }
2306 }
2307
2308 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2309 _sun_java_launcher = os::strdup_check_oom(launcher);
2310 }
2311
2312 bool Arguments::created_by_java_launcher() {
2313 assert(_sun_java_launcher != NULL, "property must have value");
2314 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2315 }
2316
2317 bool Arguments::sun_java_launcher_is_altjvm() {
2318 return _sun_java_launcher_is_altjvm;
2319 }
2320
2321 //===========================================================================================================
2322 // Parsing of main arguments
2323
2324 #if INCLUDE_JVMCI
2325 // Check consistency of jvmci vm argument settings.
2326 bool Arguments::check_jvmci_args_consistency() {
2327 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2328 }
2329 #endif //INCLUDE_JVMCI
2330
2331 // Check consistency of GC selection
2332 bool Arguments::check_gc_consistency() {
2333 // Ensure that the user has not selected conflicting sets
2334 // of collectors.
2335 uint i = 0;
2336 if (UseSerialGC) i++;
2337 if (UseConcMarkSweepGC) i++;
2338 if (UseParallelGC || UseParallelOldGC) i++;
2339 if (UseG1GC) i++;
2340 if (i > 1) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Conflicting collector combinations in option list; "
2343 "please refer to the release notes for the combinations "
2344 "allowed\n");
2345 return false;
2346 }
2347
2348 if (UseConcMarkSweepGC && !UseParNewGC) {
2349 jio_fprintf(defaultStream::error_stream(),
2350 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2351 return false;
2352 }
2353
2354 if (UseParNewGC && !UseConcMarkSweepGC) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2357 return false;
2358 }
2359
2360 return true;
2361 }
2362
2363 // Check the consistency of vm_init_args
2364 bool Arguments::check_vm_args_consistency() {
2365 // Method for adding checks for flag consistency.
2366 // The intent is to warn the user of all possible conflicts,
2367 // before returning an error.
2368 // Note: Needs platform-dependent factoring.
2369 bool status = true;
2370
2371 if (TLABRefillWasteFraction == 0) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "TLABRefillWasteFraction should be a denominator, "
2374 "not " SIZE_FORMAT "\n",
2375 TLABRefillWasteFraction);
2376 status = false;
2377 }
2378
2379 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2380 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2381 }
2382
2383 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2384 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2385 }
2386
2387 if (GCTimeLimit == 100) {
2388 // Turn off gc-overhead-limit-exceeded checks
2389 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2390 }
2391
2392 status = status && check_gc_consistency();
2393
2394 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2395 // insists that we hold the requisite locks so that the iteration is
2396 // MT-safe. For the verification at start-up and shut-down, we don't
2397 // yet have a good way of acquiring and releasing these locks,
2398 // which are not visible at the CollectedHeap level. We want to
2399 // be able to acquire these locks and then do the iteration rather
2400 // than just disable the lock verification. This will be fixed under
2401 // bug 4788986.
2402 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2403 if (VerifyDuringStartup) {
2404 warning("Heap verification at start-up disabled "
2405 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2406 VerifyDuringStartup = false; // Disable verification at start-up
2407 }
2408
2409 if (VerifyBeforeExit) {
2410 warning("Heap verification at shutdown disabled "
2411 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2412 VerifyBeforeExit = false; // Disable verification at shutdown
2413 }
2414 }
2415
2416 if (PrintNMTStatistics) {
2417 #if INCLUDE_NMT
2418 if (MemTracker::tracking_level() == NMT_off) {
2419 #endif // INCLUDE_NMT
2420 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2421 PrintNMTStatistics = false;
2422 #if INCLUDE_NMT
2423 }
2424 #endif
2425 }
2426 #if INCLUDE_JVMCI
2427
2428 status = status && check_jvmci_args_consistency();
2429
2430 if (EnableJVMCI) {
2431 if (!ScavengeRootsInCode) {
2432 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2433 ScavengeRootsInCode = 1;
2434 }
2435 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2436 TypeProfileLevel = 0;
2437 }
2438 if (UseJVMCICompiler) {
2439 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2440 TypeProfileWidth = 8;
2441 }
2442 }
2443 }
2444 #endif
2445
2446 // Check lower bounds of the code cache
2447 // Template Interpreter code is approximately 3X larger in debug builds.
2448 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2449 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2452 os::vm_page_size()/K);
2453 status = false;
2454 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2457 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2458 status = false;
2459 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2462 min_code_cache_size/K);
2463 status = false;
2464 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2465 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2466 jio_fprintf(defaultStream::error_stream(),
2467 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2468 CODE_CACHE_SIZE_LIMIT/M);
2469 status = false;
2470 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2471 jio_fprintf(defaultStream::error_stream(),
2472 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2473 min_code_cache_size/K);
2474 status = false;
2475 }
2476
2477 #ifdef _LP64
2478 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2479 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2480 }
2481 #endif
2482
2483 #ifndef SUPPORT_RESERVED_STACK_AREA
2484 if (StackReservedPages != 0) {
2485 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2486 warning("Reserved Stack Area not supported on this platform");
2487 }
2488 #endif
2489
2490 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2491 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2492 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2493 }
2494 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2495 }
2496 if (UseCompiler && is_interpreter_only()) {
2497 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2498 warning("UseCompiler disabled due to -Xint.");
2499 }
2500 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2501 }
2502 #ifdef COMPILER2
2503 if (PostLoopMultiversioning && !RangeCheckElimination) {
2504 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2505 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2506 }
2507 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2508 }
2509 #endif
2510 return status;
2511 }
2512
2513 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2514 const char* option_type) {
2515 if (ignore) return false;
2516
2517 const char* spacer = " ";
2518 if (option_type == NULL) {
2519 option_type = ++spacer; // Set both to the empty string.
2520 }
2521
2522 if (os::obsolete_option(option)) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Obsolete %s%soption: %s\n", option_type, spacer,
2525 option->optionString);
2526 return false;
2527 } else {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Unrecognized %s%soption: %s\n", option_type, spacer,
2530 option->optionString);
2531 return true;
2532 }
2533 }
2534
2535 static const char* user_assertion_options[] = {
2536 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2537 };
2538
2539 static const char* system_assertion_options[] = {
2540 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2541 };
2542
2543 bool Arguments::parse_uintx(const char* value,
2544 uintx* uintx_arg,
2545 uintx min_size) {
2546
2547 // Check the sign first since atojulong() parses only unsigned values.
2548 bool value_is_positive = !(*value == '-');
2549
2550 if (value_is_positive) {
2551 julong n;
2552 bool good_return = atojulong(value, &n);
2553 if (good_return) {
2554 bool above_minimum = n >= min_size;
2555 bool value_is_too_large = n > max_uintx;
2556
2557 if (above_minimum && !value_is_too_large) {
2558 *uintx_arg = n;
2559 return true;
2560 }
2561 }
2562 }
2563 return false;
2564 }
2565
2566 unsigned int addreads_count = 0;
2567 unsigned int addexports_count = 0;
2568 unsigned int patch_mod_count = 0;
2569 const char* add_modules_value = NULL;
2570
2571 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2572 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2573 char* property = AllocateHeap(prop_len, mtArguments);
2574 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2575 if (ret < 0 || ret >= (int)prop_len) {
2576 FreeHeap(property);
2577 return false;
2578 }
2579 bool added = add_property(property, UnwriteableProperty, internal);
2580 FreeHeap(property);
2581 return added;
2582 }
2583
2584 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2585 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2586 if (count < 1000) {
2587 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2588 char* property = AllocateHeap(prop_len, mtArguments);
2589 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2590 if (ret < 0 || ret >= (int)prop_len) {
2591 FreeHeap(property);
2592 return false;
2593 }
2594 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2595 FreeHeap(property);
2596 return added;
2597 }
2598 return false;
2599 }
2600
2601 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2602 julong* long_arg,
2603 julong min_size) {
2604 if (!atojulong(s, long_arg)) return arg_unreadable;
2605 return check_memory_size(*long_arg, min_size);
2606 }
2607
2608 // Parse JavaVMInitArgs structure
2609
2610 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2611 const JavaVMInitArgs *java_options_args,
2612 const JavaVMInitArgs *cmd_line_args) {
2613 bool patch_mod_javabase = false;
2614
2615 // Save default settings for some mode flags
2616 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2617 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2618 Arguments::_ClipInlining = ClipInlining;
2619 Arguments::_BackgroundCompilation = BackgroundCompilation;
2620 if (TieredCompilation) {
2621 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2622 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2623 }
2624
2625 // Setup flags for mixed which is the default
2626 set_mode_flags(_mixed);
2627
2628 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2629 // variable (if present).
2630 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Parse args structure generated from the command line flags.
2636 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2637 if (result != JNI_OK) {
2638 return result;
2639 }
2640
2641 // Parse args structure generated from the _JAVA_OPTIONS environment
2642 // variable (if present) (mimics classic VM)
2643 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2644 if (result != JNI_OK) {
2645 return result;
2646 }
2647
2648 // Do final processing now that all arguments have been parsed
2649 result = finalize_vm_init_args();
2650 if (result != JNI_OK) {
2651 return result;
2652 }
2653
2654 return JNI_OK;
2655 }
2656
2657 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2658 // represents a valid JDWP agent. is_path==true denotes that we
2659 // are dealing with -agentpath (case where name is a path), otherwise with
2660 // -agentlib
2661 bool valid_jdwp_agent(char *name, bool is_path) {
2662 char *_name;
2663 const char *_jdwp = "jdwp";
2664 size_t _len_jdwp, _len_prefix;
2665
2666 if (is_path) {
2667 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2668 return false;
2669 }
2670
2671 _name++; // skip past last path separator
2672 _len_prefix = strlen(JNI_LIB_PREFIX);
2673
2674 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2675 return false;
2676 }
2677
2678 _name += _len_prefix;
2679 _len_jdwp = strlen(_jdwp);
2680
2681 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2682 _name += _len_jdwp;
2683 }
2684 else {
2685 return false;
2686 }
2687
2688 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2689 return false;
2690 }
2691
2692 return true;
2693 }
2694
2695 if (strcmp(name, _jdwp) == 0) {
2696 return true;
2697 }
2698
2699 return false;
2700 }
2701
2702 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2703 // --patch-module=<module>=<file>(<pathsep><file>)*
2704 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2705 // Find the equal sign between the module name and the path specification
2706 const char* module_equal = strchr(patch_mod_tail, '=');
2707 if (module_equal == NULL) {
2708 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2709 return JNI_ERR;
2710 } else {
2711 // Pick out the module name
2712 size_t module_len = module_equal - patch_mod_tail;
2713 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2714 if (module_name != NULL) {
2715 memcpy(module_name, patch_mod_tail, module_len);
2716 *(module_name + module_len) = '\0';
2717 // The path piece begins one past the module_equal sign
2718 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2719 FREE_C_HEAP_ARRAY(char, module_name);
2720 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2721 return JNI_ENOMEM;
2722 }
2723 } else {
2724 return JNI_ENOMEM;
2725 }
2726 }
2727 return JNI_OK;
2728 }
2729
2730 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2731 // For match_option to return remaining or value part of option string
2732 const char* tail;
2733
2734 // iterate over arguments
2735 for (int index = 0; index < args->nOptions; index++) {
2736 bool is_absolute_path = false; // for -agentpath vs -agentlib
2737
2738 const JavaVMOption* option = args->options + index;
2739
2740 if (!match_option(option, "-Djava.class.path", &tail) &&
2741 !match_option(option, "-Dsun.java.command", &tail) &&
2742 !match_option(option, "-Dsun.java.launcher", &tail)) {
2743
2744 // add all jvm options to the jvm_args string. This string
2745 // is used later to set the java.vm.args PerfData string constant.
2746 // the -Djava.class.path and the -Dsun.java.command options are
2747 // omitted from jvm_args string as each have their own PerfData
2748 // string constant object.
2749 build_jvm_args(option->optionString);
2750 }
2751
2752 // -verbose:[class/gc/jni]
2753 if (match_option(option, "-verbose", &tail)) {
2754 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2755 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2756 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2757 } else if (!strcmp(tail, ":gc")) {
2758 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2759 } else if (!strcmp(tail, ":jni")) {
2760 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 }
2764 // -da / -ea / -disableassertions / -enableassertions
2765 // These accept an optional class/package name separated by a colon, e.g.,
2766 // -da:java.lang.Thread.
2767 } else if (match_option(option, user_assertion_options, &tail, true)) {
2768 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2769 if (*tail == '\0') {
2770 JavaAssertions::setUserClassDefault(enable);
2771 } else {
2772 assert(*tail == ':', "bogus match by match_option()");
2773 JavaAssertions::addOption(tail + 1, enable);
2774 }
2775 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2776 } else if (match_option(option, system_assertion_options, &tail, false)) {
2777 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2778 JavaAssertions::setSystemClassDefault(enable);
2779 // -bootclasspath:
2780 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2781 jio_fprintf(defaultStream::output_stream(),
2782 "-Xbootclasspath is no longer a supported option.\n");
2783 return JNI_EINVAL;
2784 // -bootclasspath/a:
2785 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2786 Arguments::append_sysclasspath(tail);
2787 // -bootclasspath/p:
2788 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2789 jio_fprintf(defaultStream::output_stream(),
2790 "-Xbootclasspath/p is no longer a supported option.\n");
2791 return JNI_EINVAL;
2792 // -Xrun
2793 } else if (match_option(option, "-Xrun", &tail)) {
2794 if (tail != NULL) {
2795 const char* pos = strchr(tail, ':');
2796 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2797 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2798 name[len] = '\0';
2799
2800 char *options = NULL;
2801 if(pos != NULL) {
2802 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2803 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2804 }
2805 #if !INCLUDE_JVMTI
2806 if (strcmp(name, "jdwp") == 0) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Debugging agents are not supported in this VM\n");
2809 return JNI_ERR;
2810 }
2811 #endif // !INCLUDE_JVMTI
2812 add_init_library(name, options);
2813 }
2814 } else if (match_option(option, "--add-reads=", &tail)) {
2815 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2816 return JNI_ENOMEM;
2817 }
2818 } else if (match_option(option, "--add-exports=", &tail)) {
2819 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2820 return JNI_ENOMEM;
2821 }
2822 } else if (match_option(option, "--add-modules=", &tail)) {
2823 add_modules_value = tail;
2824 } else if (match_option(option, "--limit-modules=", &tail)) {
2825 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2826 return JNI_ENOMEM;
2827 }
2828 } else if (match_option(option, "--module-path=", &tail)) {
2829 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2830 return JNI_ENOMEM;
2831 }
2832 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2833 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2834 return JNI_ENOMEM;
2835 }
2836 } else if (match_option(option, "--patch-module=", &tail)) {
2837 // --patch-module=<module>=<file>(<pathsep><file>)*
2838 int res = process_patch_mod_option(tail, patch_mod_javabase);
2839 if (res != JNI_OK) {
2840 return res;
2841 }
2842 // -agentlib and -agentpath
2843 } else if (match_option(option, "-agentlib:", &tail) ||
2844 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2845 if(tail != NULL) {
2846 const char* pos = strchr(tail, '=');
2847 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2848 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2849 name[len] = '\0';
2850
2851 char *options = NULL;
2852 if(pos != NULL) {
2853 options = os::strdup_check_oom(pos + 1, mtArguments);
2854 }
2855 #if !INCLUDE_JVMTI
2856 if (valid_jdwp_agent(name, is_absolute_path)) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Debugging agents are not supported in this VM\n");
2859 return JNI_ERR;
2860 }
2861 #endif // !INCLUDE_JVMTI
2862 add_init_agent(name, options, is_absolute_path);
2863 }
2864 // -javaagent
2865 } else if (match_option(option, "-javaagent:", &tail)) {
2866 #if !INCLUDE_JVMTI
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Instrumentation agents are not supported in this VM\n");
2869 return JNI_ERR;
2870 #else
2871 if (tail != NULL) {
2872 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2873 add_init_agent("instrument", options, false);
2874 // java agents need module java.instrument
2875 if (!Arguments::append_to_addmods_property("java.instrument")) {
2876 return JNI_ENOMEM;
2877 }
2878 }
2879 #endif // !INCLUDE_JVMTI
2880 // -Xnoclassgc
2881 } else if (match_option(option, "-Xnoclassgc")) {
2882 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 // -Xconcgc
2886 } else if (match_option(option, "-Xconcgc")) {
2887 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 // -Xnoconcgc
2891 } else if (match_option(option, "-Xnoconcgc")) {
2892 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 // -Xbatch
2896 } else if (match_option(option, "-Xbatch")) {
2897 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 // -Xmn for compatibility with other JVM vendors
2901 } else if (match_option(option, "-Xmn", &tail)) {
2902 julong long_initial_young_size = 0;
2903 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2904 if (errcode != arg_in_range) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Invalid initial young generation size: %s\n", option->optionString);
2907 describe_range_error(errcode);
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // -Xms
2917 } else if (match_option(option, "-Xms", &tail)) {
2918 julong long_initial_heap_size = 0;
2919 // an initial heap size of 0 means automatically determine
2920 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2921 if (errcode != arg_in_range) {
2922 jio_fprintf(defaultStream::error_stream(),
2923 "Invalid initial heap size: %s\n", option->optionString);
2924 describe_range_error(errcode);
2925 return JNI_EINVAL;
2926 }
2927 set_min_heap_size((size_t)long_initial_heap_size);
2928 // Currently the minimum size and the initial heap sizes are the same.
2929 // Can be overridden with -XX:InitialHeapSize.
2930 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 // -Xmx
2934 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2935 julong long_max_heap_size = 0;
2936 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2937 if (errcode != arg_in_range) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid maximum heap size: %s\n", option->optionString);
2940 describe_range_error(errcode);
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 // Xmaxf
2947 } else if (match_option(option, "-Xmaxf", &tail)) {
2948 char* err;
2949 int maxf = (int)(strtod(tail, &err) * 100);
2950 if (*err != '\0' || *tail == '\0') {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Bad max heap free percentage size: %s\n",
2953 option->optionString);
2954 return JNI_EINVAL;
2955 } else {
2956 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 }
2960 // Xminf
2961 } else if (match_option(option, "-Xminf", &tail)) {
2962 char* err;
2963 int minf = (int)(strtod(tail, &err) * 100);
2964 if (*err != '\0' || *tail == '\0') {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "Bad min heap free percentage size: %s\n",
2967 option->optionString);
2968 return JNI_EINVAL;
2969 } else {
2970 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2971 return JNI_EINVAL;
2972 }
2973 }
2974 // -Xss
2975 } else if (match_option(option, "-Xss", &tail)) {
2976 julong long_ThreadStackSize = 0;
2977 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2978 if (errcode != arg_in_range) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Invalid thread stack size: %s\n", option->optionString);
2981 describe_range_error(errcode);
2982 return JNI_EINVAL;
2983 }
2984 // Internally track ThreadStackSize in units of 1024 bytes.
2985 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2986 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2990 } else if (match_option(option, "-Xoss", &tail) ||
2991 match_option(option, "-Xsqnopause") ||
2992 match_option(option, "-Xoptimize") ||
2993 match_option(option, "-Xboundthreads") ||
2994 match_option(option, "-Xusealtsigs")) {
2995 // All these options are deprecated in JDK 9 and will be removed in a future release
2996 char version[256];
2997 JDK_Version::jdk(9).to_string(version, sizeof(version));
2998 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2999 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3000 julong long_CodeCacheExpansionSize = 0;
3001 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3002 if (errcode != arg_in_range) {
3003 jio_fprintf(defaultStream::error_stream(),
3004 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3005 os::vm_page_size()/K);
3006 return JNI_EINVAL;
3007 }
3008 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3009 return JNI_EINVAL;
3010 }
3011 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3012 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3013 julong long_ReservedCodeCacheSize = 0;
3014
3015 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3016 if (errcode != arg_in_range) {
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Invalid maximum code cache size: %s.\n", option->optionString);
3019 return JNI_EINVAL;
3020 }
3021 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 // -XX:NonNMethodCodeHeapSize=
3025 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3026 julong long_NonNMethodCodeHeapSize = 0;
3027
3028 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3029 if (errcode != arg_in_range) {
3030 jio_fprintf(defaultStream::error_stream(),
3031 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3032 return JNI_EINVAL;
3033 }
3034 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 // -XX:ProfiledCodeHeapSize=
3038 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3039 julong long_ProfiledCodeHeapSize = 0;
3040
3041 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3042 if (errcode != arg_in_range) {
3043 jio_fprintf(defaultStream::error_stream(),
3044 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -XX:NonProfiledCodeHeapSizee=
3051 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3052 julong long_NonProfiledCodeHeapSize = 0;
3053
3054 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3055 if (errcode != arg_in_range) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3058 return JNI_EINVAL;
3059 }
3060 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 // -green
3064 } else if (match_option(option, "-green")) {
3065 jio_fprintf(defaultStream::error_stream(),
3066 "Green threads support not available\n");
3067 return JNI_EINVAL;
3068 // -native
3069 } else if (match_option(option, "-native")) {
3070 // HotSpot always uses native threads, ignore silently for compatibility
3071 // -Xrs
3072 } else if (match_option(option, "-Xrs")) {
3073 // Classic/EVM option, new functionality
3074 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 // -Xprof
3078 } else if (match_option(option, "-Xprof")) {
3079 #if INCLUDE_FPROF
3080 _has_profile = true;
3081 #else // INCLUDE_FPROF
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Flat profiling is not supported in this VM.\n");
3084 return JNI_ERR;
3085 #endif // INCLUDE_FPROF
3086 // -Xconcurrentio
3087 } else if (match_option(option, "-Xconcurrentio")) {
3088 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3101 return JNI_EINVAL;
3102 }
3103
3104 // -Xinternalversion
3105 } else if (match_option(option, "-Xinternalversion")) {
3106 jio_fprintf(defaultStream::output_stream(), "%s\n",
3107 VM_Version::internal_vm_info_string());
3108 vm_exit(0);
3109 #ifndef PRODUCT
3110 // -Xprintflags
3111 } else if (match_option(option, "-Xprintflags")) {
3112 CommandLineFlags::printFlags(tty, false);
3113 vm_exit(0);
3114 #endif
3115 // -D
3116 } else if (match_option(option, "-D", &tail)) {
3117 const char* value;
3118 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3119 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3120 // abort if -Djava.endorsed.dirs is set
3121 jio_fprintf(defaultStream::output_stream(),
3122 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3123 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3124 return JNI_EINVAL;
3125 }
3126 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3127 *value != '\0' && strcmp(value, "\"\"") != 0) {
3128 // abort if -Djava.ext.dirs is set
3129 jio_fprintf(defaultStream::output_stream(),
3130 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3131 return JNI_EINVAL;
3132 }
3133 // Check for module related properties. They must be set using the modules
3134 // options. For example: use "--add-modules=java.sql", not
3135 // "-Djdk.module.addmods=java.sql"
3136 if (is_internal_module_property(option->optionString + 2)) {
3137 needs_module_property_warning = true;
3138 continue;
3139 }
3140
3141 if (!add_property(tail)) {
3142 return JNI_ENOMEM;
3143 }
3144 // Out of the box management support
3145 if (match_option(option, "-Dcom.sun.management", &tail)) {
3146 #if INCLUDE_MANAGEMENT
3147 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 // management agent in module java.management
3151 if (!Arguments::append_to_addmods_property("java.management")) {
3152 return JNI_ENOMEM;
3153 }
3154 #else
3155 jio_fprintf(defaultStream::output_stream(),
3156 "-Dcom.sun.management is not supported in this VM.\n");
3157 return JNI_ERR;
3158 #endif
3159 }
3160 // -Xint
3161 } else if (match_option(option, "-Xint")) {
3162 set_mode_flags(_int);
3163 // -Xmixed
3164 } else if (match_option(option, "-Xmixed")) {
3165 set_mode_flags(_mixed);
3166 // -Xcomp
3167 } else if (match_option(option, "-Xcomp")) {
3168 // for testing the compiler; turn off all flags that inhibit compilation
3169 set_mode_flags(_comp);
3170 // -Xshare:dump
3171 } else if (match_option(option, "-Xshare:dump")) {
3172 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3173 return JNI_EINVAL;
3174 }
3175 set_mode_flags(_int); // Prevent compilation, which creates objects
3176 // -Xshare:on
3177 } else if (match_option(option, "-Xshare:on")) {
3178 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3179 return JNI_EINVAL;
3180 }
3181 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 // -Xshare:auto
3185 } else if (match_option(option, "-Xshare:auto")) {
3186 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 // -Xshare:off
3193 } else if (match_option(option, "-Xshare:off")) {
3194 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 // -Xverify
3201 } else if (match_option(option, "-Xverify", &tail)) {
3202 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3203 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 } else if (strcmp(tail, ":remote") == 0) {
3210 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3211 return JNI_EINVAL;
3212 }
3213 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 } else if (strcmp(tail, ":none") == 0) {
3217 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3218 return JNI_EINVAL;
3219 }
3220 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3221 return JNI_EINVAL;
3222 }
3223 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3224 return JNI_EINVAL;
3225 }
3226 // -Xdebug
3227 } else if (match_option(option, "-Xdebug")) {
3228 // note this flag has been used, then ignore
3229 set_xdebug_mode(true);
3230 // -Xnoagent
3231 } else if (match_option(option, "-Xnoagent")) {
3232 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3233 } else if (match_option(option, "-Xloggc:", &tail)) {
3234 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3235 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3236 _gc_log_filename = os::strdup_check_oom(tail);
3237 } else if (match_option(option, "-Xlog", &tail)) {
3238 bool ret = false;
3239 if (strcmp(tail, ":help") == 0) {
3240 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3241 vm_exit(0);
3242 } else if (strcmp(tail, ":disable") == 0) {
3243 LogConfiguration::disable_logging();
3244 ret = true;
3245 } else if (*tail == '\0') {
3246 ret = LogConfiguration::parse_command_line_arguments();
3247 assert(ret, "-Xlog without arguments should never fail to parse");
3248 } else if (*tail == ':') {
3249 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3250 }
3251 if (ret == false) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Invalid -Xlog option '-Xlog%s'\n",
3254 tail);
3255 return JNI_EINVAL;
3256 }
3257 // JNI hooks
3258 } else if (match_option(option, "-Xcheck", &tail)) {
3259 if (!strcmp(tail, ":jni")) {
3260 #if !INCLUDE_JNI_CHECK
3261 warning("JNI CHECKING is not supported in this VM");
3262 #else
3263 CheckJNICalls = true;
3264 #endif // INCLUDE_JNI_CHECK
3265 } else if (is_bad_option(option, args->ignoreUnrecognized,
3266 "check")) {
3267 return JNI_EINVAL;
3268 }
3269 } else if (match_option(option, "vfprintf")) {
3270 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3271 } else if (match_option(option, "exit")) {
3272 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3273 } else if (match_option(option, "abort")) {
3274 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3275 // -XX:+AggressiveHeap
3276 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3277 jint result = set_aggressive_heap_flags();
3278 if (result != JNI_OK) {
3279 return result;
3280 }
3281 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3282 // and the last option wins.
3283 } else if (match_option(option, "-XX:+NeverTenure")) {
3284 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3285 return JNI_EINVAL;
3286 }
3287 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3288 return JNI_EINVAL;
3289 }
3290 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3294 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3298 return JNI_EINVAL;
3299 }
3300 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3304 uintx max_tenuring_thresh = 0;
3305 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3306 jio_fprintf(defaultStream::error_stream(),
3307 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3308 return JNI_EINVAL;
3309 }
3310
3311 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3312 return JNI_EINVAL;
3313 }
3314
3315 if (MaxTenuringThreshold == 0) {
3316 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3317 return JNI_EINVAL;
3318 }
3319 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 } else {
3323 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3324 return JNI_EINVAL;
3325 }
3326 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3327 return JNI_EINVAL;
3328 }
3329 }
3330 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3331 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3332 return JNI_EINVAL;
3333 }
3334 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3335 return JNI_EINVAL;
3336 }
3337 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3338 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3342 return JNI_EINVAL;
3343 }
3344 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3345 #if defined(DTRACE_ENABLED)
3346 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3347 return JNI_EINVAL;
3348 }
3349 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3350 return JNI_EINVAL;
3351 }
3352 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3356 return JNI_EINVAL;
3357 }
3358 #else // defined(DTRACE_ENABLED)
3359 jio_fprintf(defaultStream::error_stream(),
3360 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3361 return JNI_EINVAL;
3362 #endif // defined(DTRACE_ENABLED)
3363 #ifdef ASSERT
3364 } else if (match_option(option, "-XX:+FullGCALot")) {
3365 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3366 return JNI_EINVAL;
3367 }
3368 // disable scavenge before parallel mark-compact
3369 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3370 return JNI_EINVAL;
3371 }
3372 #endif
3373 #if !INCLUDE_MANAGEMENT
3374 } else if (match_option(option, "-XX:+ManagementServer")) {
3375 jio_fprintf(defaultStream::error_stream(),
3376 "ManagementServer is not supported in this VM.\n");
3377 return JNI_ERR;
3378 #endif // INCLUDE_MANAGEMENT
3379 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3380 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3381 // already been handled
3382 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3383 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3384 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3385 return JNI_EINVAL;
3386 }
3387 }
3388 // Unknown option
3389 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3390 return JNI_ERR;
3391 }
3392 }
3393
3394 // PrintSharedArchiveAndExit will turn on
3395 // -Xshare:on
3396 // -Xlog:class+path=info
3397 if (PrintSharedArchiveAndExit) {
3398 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3399 return JNI_EINVAL;
3400 }
3401 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3402 return JNI_EINVAL;
3403 }
3404 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3405 }
3406
3407 // Change the default value for flags which have different default values
3408 // when working with older JDKs.
3409 #ifdef LINUX
3410 if (JDK_Version::current().compare_major(6) <= 0 &&
3411 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3412 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3413 }
3414 #endif // LINUX
3415 fix_appclasspath();
3416 return JNI_OK;
3417 }
3418
3419 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3420 // For java.base check for duplicate --patch-module options being specified on the command line.
3421 // This check is only required for java.base, all other duplicate module specifications
3422 // will be checked during module system initialization. The module system initialization
3423 // will throw an ExceptionInInitializerError if this situation occurs.
3424 if (strcmp(module_name, "java.base") == 0) {
3425 if (*patch_mod_javabase) {
3426 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3427 } else {
3428 *patch_mod_javabase = true;
3429 }
3430 }
3431
3432 // Create GrowableArray lazily, only if --patch-module has been specified
3433 if (_patch_mod_prefix == NULL) {
3434 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3435 }
3436
3437 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3438 }
3439
3440 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3441 //
3442 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3443 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3444 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3445 // path is treated as the current directory.
3446 //
3447 // This causes problems with CDS, which requires that all directories specified in the classpath
3448 // must be empty. In most cases, applications do NOT want to load classes from the current
3449 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3450 // scripts compatible with CDS.
3451 void Arguments::fix_appclasspath() {
3452 if (IgnoreEmptyClassPaths) {
3453 const char separator = *os::path_separator();
3454 const char* src = _java_class_path->value();
3455
3456 // skip over all the leading empty paths
3457 while (*src == separator) {
3458 src ++;
3459 }
3460
3461 char* copy = os::strdup_check_oom(src, mtArguments);
3462
3463 // trim all trailing empty paths
3464 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3465 *tail = '\0';
3466 }
3467
3468 char from[3] = {separator, separator, '\0'};
3469 char to [2] = {separator, '\0'};
3470 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3471 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3472 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3473 }
3474
3475 _java_class_path->set_writeable_value(copy);
3476 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3477 }
3478 }
3479
3480 static bool has_jar_files(const char* directory) {
3481 DIR* dir = os::opendir(directory);
3482 if (dir == NULL) return false;
3483
3484 struct dirent *entry;
3485 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3486 bool hasJarFile = false;
3487 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3488 const char* name = entry->d_name;
3489 const char* ext = name + strlen(name) - 4;
3490 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3491 }
3492 FREE_C_HEAP_ARRAY(char, dbuf);
3493 os::closedir(dir);
3494 return hasJarFile ;
3495 }
3496
3497 static int check_non_empty_dirs(const char* path) {
3498 const char separator = *os::path_separator();
3499 const char* const end = path + strlen(path);
3500 int nonEmptyDirs = 0;
3501 while (path < end) {
3502 const char* tmp_end = strchr(path, separator);
3503 if (tmp_end == NULL) {
3504 if (has_jar_files(path)) {
3505 nonEmptyDirs++;
3506 jio_fprintf(defaultStream::output_stream(),
3507 "Non-empty directory: %s\n", path);
3508 }
3509 path = end;
3510 } else {
3511 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3512 memcpy(dirpath, path, tmp_end - path);
3513 dirpath[tmp_end - path] = '\0';
3514 if (has_jar_files(dirpath)) {
3515 nonEmptyDirs++;
3516 jio_fprintf(defaultStream::output_stream(),
3517 "Non-empty directory: %s\n", dirpath);
3518 }
3519 FREE_C_HEAP_ARRAY(char, dirpath);
3520 path = tmp_end + 1;
3521 }
3522 }
3523 return nonEmptyDirs;
3524 }
3525
3526 jint Arguments::finalize_vm_init_args() {
3527 // check if the default lib/endorsed directory exists; if so, error
3528 char path[JVM_MAXPATHLEN];
3529 const char* fileSep = os::file_separator();
3530 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3531
3532 if (CheckEndorsedAndExtDirs) {
3533 int nonEmptyDirs = 0;
3534 // check endorsed directory
3535 nonEmptyDirs += check_non_empty_dirs(path);
3536 // check the extension directories
3537 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3538 if (nonEmptyDirs > 0) {
3539 return JNI_ERR;
3540 }
3541 }
3542
3543 DIR* dir = os::opendir(path);
3544 if (dir != NULL) {
3545 jio_fprintf(defaultStream::output_stream(),
3546 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3547 "in modular form will be supported via the concept of upgradeable modules.\n");
3548 os::closedir(dir);
3549 return JNI_ERR;
3550 }
3551
3552 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3553 dir = os::opendir(path);
3554 if (dir != NULL) {
3555 jio_fprintf(defaultStream::output_stream(),
3556 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3557 "Use -classpath instead.\n.");
3558 os::closedir(dir);
3559 return JNI_ERR;
3560 }
3561
3562 // Append the value of the last --add-modules option specified on the command line.
3563 // This needs to be done here, to prevent overwriting possible values written
3564 // to the jdk.module.addmods property by -javaagent and other options.
3565 if (add_modules_value != NULL) {
3566 if (!append_to_addmods_property(add_modules_value)) {
3567 return JNI_ENOMEM;
3568 }
3569 }
3570
3571 // This must be done after all arguments have been processed.
3572 // java_compiler() true means set to "NONE" or empty.
3573 if (java_compiler() && !xdebug_mode()) {
3574 // For backwards compatibility, we switch to interpreted mode if
3575 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3576 // not specified.
3577 set_mode_flags(_int);
3578 }
3579
3580 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3581 // but like -Xint, leave compilation thresholds unaffected.
3582 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3583 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3584 set_mode_flags(_int);
3585 }
3586
3587 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3588 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3589 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3590 }
3591
3592 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3593 // Don't degrade server performance for footprint
3594 if (FLAG_IS_DEFAULT(UseLargePages) &&
3595 MaxHeapSize < LargePageHeapSizeThreshold) {
3596 // No need for large granularity pages w/small heaps.
3597 // Note that large pages are enabled/disabled for both the
3598 // Java heap and the code cache.
3599 FLAG_SET_DEFAULT(UseLargePages, false);
3600 }
3601
3602 #elif defined(COMPILER2)
3603 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3604 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3605 }
3606 #endif
3607
3608 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3609 UNSUPPORTED_OPTION(ProfileInterpreter);
3610 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3611 #endif
3612
3613 #ifndef TIERED
3614 // Tiered compilation is undefined.
3615 UNSUPPORTED_OPTION(TieredCompilation);
3616 #endif
3617
3618 #if INCLUDE_JVMCI
3619 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3620 return JNI_ENOMEM;
3621 }
3622 #endif
3623
3624 // If we are running in a headless jre, force java.awt.headless property
3625 // to be true unless the property has already been set.
3626 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3627 if (os::is_headless_jre()) {
3628 const char* headless = Arguments::get_property("java.awt.headless");
3629 if (headless == NULL) {
3630 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3631 if (headless_env == NULL) {
3632 if (!add_property("java.awt.headless=true")) {
3633 return JNI_ENOMEM;
3634 }
3635 } else {
3636 char buffer[256];
3637 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3638 if (!add_property(buffer)) {
3639 return JNI_ENOMEM;
3640 }
3641 }
3642 }
3643 }
3644
3645 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3646 // CMS can only be used with ParNew
3647 FLAG_SET_ERGO(bool, UseParNewGC, true);
3648 }
3649
3650 if (!check_vm_args_consistency()) {
3651 return JNI_ERR;
3652 }
3653
3654 return JNI_OK;
3655 }
3656
3657 // Helper class for controlling the lifetime of JavaVMInitArgs
3658 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3659 // deleted on the destruction of the ScopedVMInitArgs object.
3660 class ScopedVMInitArgs : public StackObj {
3661 private:
3662 JavaVMInitArgs _args;
3663 char* _container_name;
3664 bool _is_set;
3665 char* _vm_options_file_arg;
3666
3667 public:
3668 ScopedVMInitArgs(const char *container_name) {
3669 _args.version = JNI_VERSION_1_2;
3670 _args.nOptions = 0;
3671 _args.options = NULL;
3672 _args.ignoreUnrecognized = false;
3673 _container_name = (char *)container_name;
3674 _is_set = false;
3675 _vm_options_file_arg = NULL;
3676 }
3677
3678 // Populates the JavaVMInitArgs object represented by this
3679 // ScopedVMInitArgs object with the arguments in options. The
3680 // allocated memory is deleted by the destructor. If this method
3681 // returns anything other than JNI_OK, then this object is in a
3682 // partially constructed state, and should be abandoned.
3683 jint set_args(GrowableArray<JavaVMOption>* options) {
3684 _is_set = true;
3685 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3686 JavaVMOption, options->length(), mtArguments);
3687 if (options_arr == NULL) {
3688 return JNI_ENOMEM;
3689 }
3690 _args.options = options_arr;
3691
3692 for (int i = 0; i < options->length(); i++) {
3693 options_arr[i] = options->at(i);
3694 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3695 if (options_arr[i].optionString == NULL) {
3696 // Rely on the destructor to do cleanup.
3697 _args.nOptions = i;
3698 return JNI_ENOMEM;
3699 }
3700 }
3701
3702 _args.nOptions = options->length();
3703 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3704 return JNI_OK;
3705 }
3706
3707 JavaVMInitArgs* get() { return &_args; }
3708 char* container_name() { return _container_name; }
3709 bool is_set() { return _is_set; }
3710 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3711 char* vm_options_file_arg() { return _vm_options_file_arg; }
3712
3713 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3714 if (_vm_options_file_arg != NULL) {
3715 os::free(_vm_options_file_arg);
3716 }
3717 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3718 }
3719
3720 ~ScopedVMInitArgs() {
3721 if (_vm_options_file_arg != NULL) {
3722 os::free(_vm_options_file_arg);
3723 }
3724 if (_args.options == NULL) return;
3725 for (int i = 0; i < _args.nOptions; i++) {
3726 os::free(_args.options[i].optionString);
3727 }
3728 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3729 }
3730
3731 // Insert options into this option list, to replace option at
3732 // vm_options_file_pos (-XX:VMOptionsFile)
3733 jint insert(const JavaVMInitArgs* args,
3734 const JavaVMInitArgs* args_to_insert,
3735 const int vm_options_file_pos) {
3736 assert(_args.options == NULL, "shouldn't be set yet");
3737 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3738 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3739
3740 int length = args->nOptions + args_to_insert->nOptions - 1;
3741 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3742 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3743 for (int i = 0; i < args->nOptions; i++) {
3744 if (i == vm_options_file_pos) {
3745 // insert the new options starting at the same place as the
3746 // -XX:VMOptionsFile option
3747 for (int j = 0; j < args_to_insert->nOptions; j++) {
3748 options->push(args_to_insert->options[j]);
3749 }
3750 } else {
3751 options->push(args->options[i]);
3752 }
3753 }
3754 // make into options array
3755 jint result = set_args(options);
3756 delete options;
3757 return result;
3758 }
3759 };
3760
3761 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3762 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3763 }
3764
3765 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3766 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3767 }
3768
3769 jint Arguments::parse_options_environment_variable(const char* name,
3770 ScopedVMInitArgs* vm_args) {
3771 char *buffer = ::getenv(name);
3772
3773 // Don't check this environment variable if user has special privileges
3774 // (e.g. unix su command).
3775 if (buffer == NULL || os::have_special_privileges()) {
3776 return JNI_OK;
3777 }
3778
3779 if ((buffer = os::strdup(buffer)) == NULL) {
3780 return JNI_ENOMEM;
3781 }
3782
3783 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3784
3785 os::free(buffer);
3786 return retcode;
3787 }
3788
3789 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3790 // read file into buffer
3791 int fd = ::open(file_name, O_RDONLY);
3792 if (fd < 0) {
3793 jio_fprintf(defaultStream::error_stream(),
3794 "Could not open options file '%s'\n",
3795 file_name);
3796 return JNI_ERR;
3797 }
3798
3799 struct stat stbuf;
3800 int retcode = os::stat(file_name, &stbuf);
3801 if (retcode != 0) {
3802 jio_fprintf(defaultStream::error_stream(),
3803 "Could not stat options file '%s'\n",
3804 file_name);
3805 os::close(fd);
3806 return JNI_ERR;
3807 }
3808
3809 if (stbuf.st_size == 0) {
3810 // tell caller there is no option data and that is ok
3811 os::close(fd);
3812 return JNI_OK;
3813 }
3814
3815 // '+ 1' for NULL termination even with max bytes
3816 size_t bytes_alloc = stbuf.st_size + 1;
3817
3818 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3819 if (NULL == buf) {
3820 jio_fprintf(defaultStream::error_stream(),
3821 "Could not allocate read buffer for options file parse\n");
3822 os::close(fd);
3823 return JNI_ENOMEM;
3824 }
3825
3826 memset(buf, 0, bytes_alloc);
3827
3828 // Fill buffer
3829 // Use ::read() instead of os::read because os::read()
3830 // might do a thread state transition
3831 // and it is too early for that here
3832
3833 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3834 os::close(fd);
3835 if (bytes_read < 0) {
3836 FREE_C_HEAP_ARRAY(char, buf);
3837 jio_fprintf(defaultStream::error_stream(),
3838 "Could not read options file '%s'\n", file_name);
3839 return JNI_ERR;
3840 }
3841
3842 if (bytes_read == 0) {
3843 // tell caller there is no option data and that is ok
3844 FREE_C_HEAP_ARRAY(char, buf);
3845 return JNI_OK;
3846 }
3847
3848 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3849
3850 FREE_C_HEAP_ARRAY(char, buf);
3851 return retcode;
3852 }
3853
3854 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3855 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3856
3857 // some pointers to help with parsing
3858 char *buffer_end = buffer + buf_len;
3859 char *opt_hd = buffer;
3860 char *wrt = buffer;
3861 char *rd = buffer;
3862
3863 // parse all options
3864 while (rd < buffer_end) {
3865 // skip leading white space from the input string
3866 while (rd < buffer_end && isspace(*rd)) {
3867 rd++;
3868 }
3869
3870 if (rd >= buffer_end) {
3871 break;
3872 }
3873
3874 // Remember this is where we found the head of the token.
3875 opt_hd = wrt;
3876
3877 // Tokens are strings of non white space characters separated
3878 // by one or more white spaces.
3879 while (rd < buffer_end && !isspace(*rd)) {
3880 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3881 int quote = *rd; // matching quote to look for
3882 rd++; // don't copy open quote
3883 while (rd < buffer_end && *rd != quote) {
3884 // include everything (even spaces)
3885 // up until the close quote
3886 *wrt++ = *rd++; // copy to option string
3887 }
3888
3889 if (rd < buffer_end) {
3890 rd++; // don't copy close quote
3891 } else {
3892 // did not see closing quote
3893 jio_fprintf(defaultStream::error_stream(),
3894 "Unmatched quote in %s\n", name);
3895 delete options;
3896 return JNI_ERR;
3897 }
3898 } else {
3899 *wrt++ = *rd++; // copy to option string
3900 }
3901 }
3902
3903 // steal a white space character and set it to NULL
3904 *wrt++ = '\0';
3905 // We now have a complete token
3906
3907 JavaVMOption option;
3908 option.optionString = opt_hd;
3909 option.extraInfo = NULL;
3910
3911 options->append(option); // Fill in option
3912
3913 rd++; // Advance to next character
3914 }
3915
3916 // Fill out JavaVMInitArgs structure.
3917 jint status = vm_args->set_args(options);
3918
3919 delete options;
3920 return status;
3921 }
3922
3923 void Arguments::set_shared_spaces_flags() {
3924 if (DumpSharedSpaces) {
3925 if (Arguments::get_patch_mod_prefix() != NULL) {
3926 vm_exit_during_initialization(
3927 "Cannot use the following option when dumping the shared archive: --patch-module");
3928 }
3929
3930 if (RequireSharedSpaces) {
3931 warning("Cannot dump shared archive while using shared archive");
3932 }
3933 UseSharedSpaces = false;
3934 #ifdef _LP64
3935 if (!UseCompressedOops || !UseCompressedClassPointers) {
3936 vm_exit_during_initialization(
3937 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3938 }
3939 } else {
3940 if (!UseCompressedOops || !UseCompressedClassPointers) {
3941 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3942 }
3943 #endif
3944 }
3945 }
3946
3947 // Sharing support
3948 // Construct the path to the archive
3949 static char* get_shared_archive_path() {
3950 char *shared_archive_path;
3951 if (SharedArchiveFile == NULL) {
3952 char jvm_path[JVM_MAXPATHLEN];
3953 os::jvm_path(jvm_path, sizeof(jvm_path));
3954 char *end = strrchr(jvm_path, *os::file_separator());
3955 if (end != NULL) *end = '\0';
3956 size_t jvm_path_len = strlen(jvm_path);
3957 size_t file_sep_len = strlen(os::file_separator());
3958 const size_t len = jvm_path_len + file_sep_len + 20;
3959 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3960 if (shared_archive_path != NULL) {
3961 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3962 jvm_path, os::file_separator());
3963 }
3964 } else {
3965 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3966 }
3967 return shared_archive_path;
3968 }
3969
3970 #ifndef PRODUCT
3971 // Determine whether LogVMOutput should be implicitly turned on.
3972 static bool use_vm_log() {
3973 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3974 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3975 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3976 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3977 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3978 return true;
3979 }
3980
3981 #ifdef COMPILER1
3982 if (PrintC1Statistics) {
3983 return true;
3984 }
3985 #endif // COMPILER1
3986
3987 #ifdef COMPILER2
3988 if (PrintOptoAssembly || PrintOptoStatistics) {
3989 return true;
3990 }
3991 #endif // COMPILER2
3992
3993 return false;
3994 }
3995
3996 #endif // PRODUCT
3997
3998 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3999 for (int index = 0; index < args->nOptions; index++) {
4000 const JavaVMOption* option = args->options + index;
4001 const char* tail;
4002 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4003 return true;
4004 }
4005 }
4006 return false;
4007 }
4008
4009 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4010 const char* vm_options_file,
4011 const int vm_options_file_pos,
4012 ScopedVMInitArgs* vm_options_file_args,
4013 ScopedVMInitArgs* args_out) {
4014 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4015 if (code != JNI_OK) {
4016 return code;
4017 }
4018
4019 if (vm_options_file_args->get()->nOptions < 1) {
4020 return JNI_OK;
4021 }
4022
4023 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4024 jio_fprintf(defaultStream::error_stream(),
4025 "A VM options file may not refer to a VM options file. "
4026 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4027 "options file '%s' in options container '%s' is an error.\n",
4028 vm_options_file_args->vm_options_file_arg(),
4029 vm_options_file_args->container_name());
4030 return JNI_EINVAL;
4031 }
4032
4033 return args_out->insert(args, vm_options_file_args->get(),
4034 vm_options_file_pos);
4035 }
4036
4037 // Expand -XX:VMOptionsFile found in args_in as needed.
4038 // mod_args and args_out parameters may return values as needed.
4039 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4040 ScopedVMInitArgs* mod_args,
4041 JavaVMInitArgs** args_out) {
4042 jint code = match_special_option_and_act(args_in, mod_args);
4043 if (code != JNI_OK) {
4044 return code;
4045 }
4046
4047 if (mod_args->is_set()) {
4048 // args_in contains -XX:VMOptionsFile and mod_args contains the
4049 // original options from args_in along with the options expanded
4050 // from the VMOptionsFile. Return a short-hand to the caller.
4051 *args_out = mod_args->get();
4052 } else {
4053 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4054 }
4055 return JNI_OK;
4056 }
4057
4058 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4059 ScopedVMInitArgs* args_out) {
4060 // Remaining part of option string
4061 const char* tail;
4062 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4063
4064 for (int index = 0; index < args->nOptions; index++) {
4065 const JavaVMOption* option = args->options + index;
4066 if (ArgumentsExt::process_options(option)) {
4067 continue;
4068 }
4069 if (match_option(option, "-XX:Flags=", &tail)) {
4070 Arguments::set_jvm_flags_file(tail);
4071 continue;
4072 }
4073 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4074 if (vm_options_file_args.found_vm_options_file_arg()) {
4075 jio_fprintf(defaultStream::error_stream(),
4076 "The option '%s' is already specified in the options "
4077 "container '%s' so the specification of '%s' in the "
4078 "same options container is an error.\n",
4079 vm_options_file_args.vm_options_file_arg(),
4080 vm_options_file_args.container_name(),
4081 option->optionString);
4082 return JNI_EINVAL;
4083 }
4084 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4085 // If there's a VMOptionsFile, parse that
4086 jint code = insert_vm_options_file(args, tail, index,
4087 &vm_options_file_args, args_out);
4088 if (code != JNI_OK) {
4089 return code;
4090 }
4091 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4092 if (args_out->is_set()) {
4093 // The VMOptions file inserted some options so switch 'args'
4094 // to the new set of options, and continue processing which
4095 // preserves "last option wins" semantics.
4096 args = args_out->get();
4097 // The first option from the VMOptionsFile replaces the
4098 // current option. So we back track to process the
4099 // replacement option.
4100 index--;
4101 }
4102 continue;
4103 }
4104 if (match_option(option, "-XX:+PrintVMOptions")) {
4105 PrintVMOptions = true;
4106 continue;
4107 }
4108 if (match_option(option, "-XX:-PrintVMOptions")) {
4109 PrintVMOptions = false;
4110 continue;
4111 }
4112 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4113 IgnoreUnrecognizedVMOptions = true;
4114 continue;
4115 }
4116 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4117 IgnoreUnrecognizedVMOptions = false;
4118 continue;
4119 }
4120 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4121 CommandLineFlags::printFlags(tty, false);
4122 vm_exit(0);
4123 }
4124 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4125 #if INCLUDE_NMT
4126 // The launcher did not setup nmt environment variable properly.
4127 if (!MemTracker::check_launcher_nmt_support(tail)) {
4128 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4129 }
4130
4131 // Verify if nmt option is valid.
4132 if (MemTracker::verify_nmt_option()) {
4133 // Late initialization, still in single-threaded mode.
4134 if (MemTracker::tracking_level() >= NMT_summary) {
4135 MemTracker::init();
4136 }
4137 } else {
4138 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4139 }
4140 continue;
4141 #else
4142 jio_fprintf(defaultStream::error_stream(),
4143 "Native Memory Tracking is not supported in this VM\n");
4144 return JNI_ERR;
4145 #endif
4146 }
4147
4148 #ifndef PRODUCT
4149 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4150 CommandLineFlags::printFlags(tty, true);
4151 vm_exit(0);
4152 }
4153 #endif
4154 }
4155 return JNI_OK;
4156 }
4157
4158 static void print_options(const JavaVMInitArgs *args) {
4159 const char* tail;
4160 for (int index = 0; index < args->nOptions; index++) {
4161 const JavaVMOption *option = args->options + index;
4162 if (match_option(option, "-XX:", &tail)) {
4163 logOption(tail);
4164 }
4165 }
4166 }
4167
4168 bool Arguments::handle_deprecated_print_gc_flags() {
4169 if (PrintGC) {
4170 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4171 }
4172 if (PrintGCDetails) {
4173 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4174 }
4175
4176 if (_gc_log_filename != NULL) {
4177 // -Xloggc was used to specify a filename
4178 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4179 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4180 } else if (PrintGC || PrintGCDetails) {
4181 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4182 }
4183 return true;
4184 }
4185
4186 // Parse entry point called from JNI_CreateJavaVM
4187
4188 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4189 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4190
4191 // Initialize ranges, constraints and writeables
4192 CommandLineFlagRangeList::init();
4193 CommandLineFlagConstraintList::init();
4194 CommandLineFlagWriteableList::init();
4195
4196 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4197 const char* hotspotrc = ".hotspotrc";
4198 bool settings_file_specified = false;
4199 bool needs_hotspotrc_warning = false;
4200 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4201 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4202
4203 // Pointers to current working set of containers
4204 JavaVMInitArgs* cur_cmd_args;
4205 JavaVMInitArgs* cur_java_options_args;
4206 JavaVMInitArgs* cur_java_tool_options_args;
4207
4208 // Containers for modified/expanded options
4209 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4210 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4211 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4212
4213
4214 jint code =
4215 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4216 if (code != JNI_OK) {
4217 return code;
4218 }
4219
4220 code = parse_java_options_environment_variable(&initial_java_options_args);
4221 if (code != JNI_OK) {
4222 return code;
4223 }
4224
4225 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4226 &mod_java_tool_options_args,
4227 &cur_java_tool_options_args);
4228 if (code != JNI_OK) {
4229 return code;
4230 }
4231
4232 code = expand_vm_options_as_needed(initial_cmd_args,
4233 &mod_cmd_args,
4234 &cur_cmd_args);
4235 if (code != JNI_OK) {
4236 return code;
4237 }
4238
4239 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4240 &mod_java_options_args,
4241 &cur_java_options_args);
4242 if (code != JNI_OK) {
4243 return code;
4244 }
4245
4246 const char* flags_file = Arguments::get_jvm_flags_file();
4247 settings_file_specified = (flags_file != NULL);
4248
4249 if (IgnoreUnrecognizedVMOptions) {
4250 cur_cmd_args->ignoreUnrecognized = true;
4251 cur_java_tool_options_args->ignoreUnrecognized = true;
4252 cur_java_options_args->ignoreUnrecognized = true;
4253 }
4254
4255 // Parse specified settings file
4256 if (settings_file_specified) {
4257 if (!process_settings_file(flags_file, true,
4258 cur_cmd_args->ignoreUnrecognized)) {
4259 return JNI_EINVAL;
4260 }
4261 } else {
4262 #ifdef ASSERT
4263 // Parse default .hotspotrc settings file
4264 if (!process_settings_file(".hotspotrc", false,
4265 cur_cmd_args->ignoreUnrecognized)) {
4266 return JNI_EINVAL;
4267 }
4268 #else
4269 struct stat buf;
4270 if (os::stat(hotspotrc, &buf) == 0) {
4271 needs_hotspotrc_warning = true;
4272 }
4273 #endif
4274 }
4275
4276 if (PrintVMOptions) {
4277 print_options(cur_java_tool_options_args);
4278 print_options(cur_cmd_args);
4279 print_options(cur_java_options_args);
4280 }
4281
4282 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4283 jint result = parse_vm_init_args(cur_java_tool_options_args,
4284 cur_java_options_args,
4285 cur_cmd_args);
4286
4287 if (result != JNI_OK) {
4288 return result;
4289 }
4290
4291 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4292 SharedArchivePath = get_shared_archive_path();
4293 if (SharedArchivePath == NULL) {
4294 return JNI_ENOMEM;
4295 }
4296
4297 // Set up VerifySharedSpaces
4298 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4299 VerifySharedSpaces = true;
4300 }
4301
4302 // Delay warning until here so that we've had a chance to process
4303 // the -XX:-PrintWarnings flag
4304 if (needs_hotspotrc_warning) {
4305 warning("%s file is present but has been ignored. "
4306 "Run with -XX:Flags=%s to load the file.",
4307 hotspotrc, hotspotrc);
4308 }
4309
4310 if (needs_module_property_warning) {
4311 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4312 " names that are reserved for internal use.");
4313 }
4314
4315 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4316 UNSUPPORTED_OPTION(UseLargePages);
4317 #endif
4318
4319 ArgumentsExt::report_unsupported_options();
4320
4321 #ifndef PRODUCT
4322 if (TraceBytecodesAt != 0) {
4323 TraceBytecodes = true;
4324 }
4325 if (CountCompiledCalls) {
4326 if (UseCounterDecay) {
4327 warning("UseCounterDecay disabled because CountCalls is set");
4328 UseCounterDecay = false;
4329 }
4330 }
4331 #endif // PRODUCT
4332
4333 if (ScavengeRootsInCode == 0) {
4334 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4335 warning("Forcing ScavengeRootsInCode non-zero");
4336 }
4337 ScavengeRootsInCode = 1;
4338 }
4339
4340 if (!handle_deprecated_print_gc_flags()) {
4341 return JNI_EINVAL;
4342 }
4343
4344 // Set object alignment values.
4345 set_object_alignment();
4346
4347 #if !INCLUDE_CDS
4348 if (DumpSharedSpaces || RequireSharedSpaces) {
4349 jio_fprintf(defaultStream::error_stream(),
4350 "Shared spaces are not supported in this VM\n");
4351 return JNI_ERR;
4352 }
4353 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4354 warning("Shared spaces are not supported in this VM");
4355 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4356 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4357 }
4358 no_shared_spaces("CDS Disabled");
4359 #endif // INCLUDE_CDS
4360
4361 return JNI_OK;
4362 }
4363
4364 jint Arguments::apply_ergo() {
4365
4366 // Set flags based on ergonomics.
4367 set_ergonomics_flags();
4368
4369 set_shared_spaces_flags();
4370
4371 // Check the GC selections again.
4372 if (!check_gc_consistency()) {
4373 return JNI_EINVAL;
4374 }
4375
4376 if (TieredCompilation) {
4377 set_tiered_flags();
4378 } else {
4379 int max_compilation_policy_choice = 1;
4380 #ifdef COMPILER2
4381 max_compilation_policy_choice = 2;
4382 #endif
4383 // Check if the policy is valid.
4384 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4385 vm_exit_during_initialization(
4386 "Incompatible compilation policy selected", NULL);
4387 }
4388 // Scale CompileThreshold
4389 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4390 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4391 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4392 }
4393 }
4394
4395 #ifdef COMPILER2
4396 #ifndef PRODUCT
4397 if (PrintIdealGraphLevel > 0) {
4398 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4399 }
4400 #endif
4401 #endif
4402
4403 // Set heap size based on available physical memory
4404 set_heap_size();
4405
4406 ArgumentsExt::set_gc_specific_flags();
4407
4408 // Initialize Metaspace flags and alignments
4409 Metaspace::ergo_initialize();
4410
4411 // Set bytecode rewriting flags
4412 set_bytecode_flags();
4413
4414 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4415 jint code = set_aggressive_opts_flags();
4416 if (code != JNI_OK) {
4417 return code;
4418 }
4419
4420 // Turn off biased locking for locking debug mode flags,
4421 // which are subtly different from each other but neither works with
4422 // biased locking
4423 if (UseHeavyMonitors
4424 #ifdef COMPILER1
4425 || !UseFastLocking
4426 #endif // COMPILER1
4427 #if INCLUDE_JVMCI
4428 || !JVMCIUseFastLocking
4429 #endif
4430 ) {
4431 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4432 // flag set to true on command line; warn the user that they
4433 // can't enable biased locking here
4434 warning("Biased Locking is not supported with locking debug flags"
4435 "; ignoring UseBiasedLocking flag." );
4436 }
4437 UseBiasedLocking = false;
4438 }
4439
4440 #ifdef CC_INTERP
4441 // Clear flags not supported on zero.
4442 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4443 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4444 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4445 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4446 #endif // CC_INTERP
4447
4448 #ifdef COMPILER2
4449 if (!EliminateLocks) {
4450 EliminateNestedLocks = false;
4451 }
4452 if (!Inline) {
4453 IncrementalInline = false;
4454 }
4455 #ifndef PRODUCT
4456 if (!IncrementalInline) {
4457 AlwaysIncrementalInline = false;
4458 }
4459 #endif
4460 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4461 // nothing to use the profiling, turn if off
4462 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4463 }
4464 #endif
4465
4466 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4467 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4468 DebugNonSafepoints = true;
4469 }
4470
4471 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4472 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4473 }
4474
4475 if (UseOnStackReplacement && !UseLoopCounter) {
4476 warning("On-stack-replacement requires loop counters; enabling loop counters");
4477 FLAG_SET_DEFAULT(UseLoopCounter, true);
4478 }
4479
4480 #ifndef PRODUCT
4481 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4482 if (use_vm_log()) {
4483 LogVMOutput = true;
4484 }
4485 }
4486 #endif // PRODUCT
4487
4488 if (PrintCommandLineFlags) {
4489 CommandLineFlags::printSetFlags(tty);
4490 }
4491
4492 // Apply CPU specific policy for the BiasedLocking
4493 if (UseBiasedLocking) {
4494 if (!VM_Version::use_biased_locking() &&
4495 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4496 UseBiasedLocking = false;
4497 }
4498 }
4499 #ifdef COMPILER2
4500 if (!UseBiasedLocking || EmitSync != 0) {
4501 UseOptoBiasInlining = false;
4502 }
4503 #endif
4504
4505 return JNI_OK;
4506 }
4507
4508 jint Arguments::adjust_after_os() {
4509 if (UseNUMA) {
4510 if (UseParallelGC || UseParallelOldGC) {
4511 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4512 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4513 }
4514 }
4515 // UseNUMAInterleaving is set to ON for all collectors and
4516 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4517 // such as the parallel collector for Linux and Solaris will
4518 // interleave old gen and survivor spaces on top of NUMA
4519 // allocation policy for the eden space.
4520 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4521 // all platforms and ParallelGC on Windows will interleave all
4522 // of the heap spaces across NUMA nodes.
4523 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4524 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4525 }
4526 }
4527 return JNI_OK;
4528 }
4529
4530 int Arguments::PropertyList_count(SystemProperty* pl) {
4531 int count = 0;
4532 while(pl != NULL) {
4533 count++;
4534 pl = pl->next();
4535 }
4536 return count;
4537 }
4538
4539 // Return the number of readable properties.
4540 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4541 int count = 0;
4542 while(pl != NULL) {
4543 if (pl->is_readable()) {
4544 count++;
4545 }
4546 pl = pl->next();
4547 }
4548 return count;
4549 }
4550
4551 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4552 assert(key != NULL, "just checking");
4553 SystemProperty* prop;
4554 for (prop = pl; prop != NULL; prop = prop->next()) {
4555 if (strcmp(key, prop->key()) == 0) return prop->value();
4556 }
4557 return NULL;
4558 }
4559
4560 // Return the value of the requested property provided that it is a readable property.
4561 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4562 assert(key != NULL, "just checking");
4563 SystemProperty* prop;
4564 // Return the property value if the keys match and the property is not internal or
4565 // it's the special internal property "jdk.boot.class.path.append".
4566 for (prop = pl; prop != NULL; prop = prop->next()) {
4567 if (strcmp(key, prop->key()) == 0) {
4568 if (!prop->internal()) {
4569 return prop->value();
4570 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4571 return prop->value();
4572 } else {
4573 // Property is internal and not jdk.boot.class.path.append so return NULL.
4574 return NULL;
4575 }
4576 }
4577 }
4578 return NULL;
4579 }
4580
4581 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4582 int count = 0;
4583 const char* ret_val = NULL;
4584
4585 while(pl != NULL) {
4586 if(count >= index) {
4587 ret_val = pl->key();
4588 break;
4589 }
4590 count++;
4591 pl = pl->next();
4592 }
4593
4594 return ret_val;
4595 }
4596
4597 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4598 int count = 0;
4599 char* ret_val = NULL;
4600
4601 while(pl != NULL) {
4602 if(count >= index) {
4603 ret_val = pl->value();
4604 break;
4605 }
4606 count++;
4607 pl = pl->next();
4608 }
4609
4610 return ret_val;
4611 }
4612
4613 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4614 SystemProperty* p = *plist;
4615 if (p == NULL) {
4616 *plist = new_p;
4617 } else {
4618 while (p->next() != NULL) {
4619 p = p->next();
4620 }
4621 p->set_next(new_p);
4622 }
4623 }
4624
4625 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4626 bool writeable, bool internal) {
4627 if (plist == NULL)
4628 return;
4629
4630 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4631 PropertyList_add(plist, new_p);
4632 }
4633
4634 void Arguments::PropertyList_add(SystemProperty *element) {
4635 PropertyList_add(&_system_properties, element);
4636 }
4637
4638 // This add maintains unique property key in the list.
4639 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4640 PropertyAppendable append, PropertyWriteable writeable,
4641 PropertyInternal internal) {
4642 if (plist == NULL)
4643 return;
4644
4645 // If property key exist then update with new value.
4646 SystemProperty* prop;
4647 for (prop = *plist; prop != NULL; prop = prop->next()) {
4648 if (strcmp(k, prop->key()) == 0) {
4649 if (append == AppendProperty) {
4650 prop->append_value(v);
4651 } else {
4652 prop->set_value(v);
4653 }
4654 return;
4655 }
4656 }
4657
4658 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4659 }
4660
4661 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4662 // Returns true if all of the source pointed by src has been copied over to
4663 // the destination buffer pointed by buf. Otherwise, returns false.
4664 // Notes:
4665 // 1. If the length (buflen) of the destination buffer excluding the
4666 // NULL terminator character is not long enough for holding the expanded
4667 // pid characters, it also returns false instead of returning the partially
4668 // expanded one.
4669 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4670 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4671 char* buf, size_t buflen) {
4672 const char* p = src;
4673 char* b = buf;
4674 const char* src_end = &src[srclen];
4675 char* buf_end = &buf[buflen - 1];
4676
4677 while (p < src_end && b < buf_end) {
4678 if (*p == '%') {
4679 switch (*(++p)) {
4680 case '%': // "%%" ==> "%"
4681 *b++ = *p++;
4682 break;
4683 case 'p': { // "%p" ==> current process id
4684 // buf_end points to the character before the last character so
4685 // that we could write '\0' to the end of the buffer.
4686 size_t buf_sz = buf_end - b + 1;
4687 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4688
4689 // if jio_snprintf fails or the buffer is not long enough to hold
4690 // the expanded pid, returns false.
4691 if (ret < 0 || ret >= (int)buf_sz) {
4692 return false;
4693 } else {
4694 b += ret;
4695 assert(*b == '\0', "fail in copy_expand_pid");
4696 if (p == src_end && b == buf_end + 1) {
4697 // reach the end of the buffer.
4698 return true;
4699 }
4700 }
4701 p++;
4702 break;
4703 }
4704 default :
4705 *b++ = '%';
4706 }
4707 } else {
4708 *b++ = *p++;
4709 }
4710 }
4711 *b = '\0';
4712 return (p == src_end); // return false if not all of the source was copied
4713 }