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