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 int Arguments::_bootclassloader_append_index = -1;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
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 #endif
1336
1337 //===========================================================================================================
1338 // Setting int/mixed/comp mode flags
1339
1340 void Arguments::set_mode_flags(Mode mode) {
1341 // Set up default values for all flags.
1342 // If you add a flag to any of the branches below,
1343 // add a default value for it here.
1344 set_java_compiler(false);
1345 _mode = mode;
1346
1347 // Ensure Agent_OnLoad has the correct initial values.
1348 // This may not be the final mode; mode may change later in onload phase.
1349 PropertyList_unique_add(&_system_properties, "java.vm.info",
1350 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1351
1352 UseInterpreter = true;
1353 UseCompiler = true;
1354 UseLoopCounter = true;
1355
1356 // Default values may be platform/compiler dependent -
1357 // use the saved values
1358 ClipInlining = Arguments::_ClipInlining;
1359 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1360 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1361 BackgroundCompilation = Arguments::_BackgroundCompilation;
1362 if (TieredCompilation) {
1363 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1364 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1365 }
1366 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1367 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1368 }
1369 }
1370
1371 // Change from defaults based on mode
1372 switch (mode) {
1373 default:
1374 ShouldNotReachHere();
1375 break;
1376 case _int:
1377 UseCompiler = false;
1378 UseLoopCounter = false;
1379 AlwaysCompileLoopMethods = false;
1380 UseOnStackReplacement = false;
1381 break;
1382 case _mixed:
1383 // same as default
1384 break;
1385 case _comp:
1386 UseInterpreter = false;
1387 BackgroundCompilation = false;
1388 ClipInlining = false;
1389 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1390 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1391 // compile a level 4 (C2) and then continue executing it.
1392 if (TieredCompilation) {
1393 Tier3InvokeNotifyFreqLog = 0;
1394 Tier4InvocationThreshold = 0;
1395 }
1396 break;
1397 }
1398 }
1399
1400 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1401 // Conflict: required to use shared spaces (-Xshare:on), but
1402 // incompatible command line options were chosen.
1403
1404 static void no_shared_spaces(const char* message) {
1405 if (RequireSharedSpaces) {
1406 jio_fprintf(defaultStream::error_stream(),
1407 "Class data sharing is inconsistent with other specified options.\n");
1408 vm_exit_during_initialization("Unable to use shared archive.", message);
1409 } else {
1410 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1411 }
1412 }
1413 #endif
1414
1415 // Returns threshold scaled with the value of scale.
1416 // If scale < 0.0, threshold is returned without scaling.
1417 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1418 if (scale == 1.0 || scale < 0.0) {
1419 return threshold;
1420 } else {
1421 return (intx)(threshold * scale);
1422 }
1423 }
1424
1425 // Returns freq_log scaled with the value of scale.
1426 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1427 // If scale < 0.0, freq_log is returned without scaling.
1428 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1429 // Check if scaling is necessary or if negative value was specified.
1430 if (scale == 1.0 || scale < 0.0) {
1431 return freq_log;
1432 }
1433 // Check values to avoid calculating log2 of 0.
1434 if (scale == 0.0 || freq_log == 0) {
1435 return 0;
1436 }
1437 // Determine the maximum notification frequency value currently supported.
1438 // The largest mask value that the interpreter/C1 can handle is
1439 // of length InvocationCounter::number_of_count_bits. Mask values are always
1440 // one bit shorter then the value of the notification frequency. Set
1441 // max_freq_bits accordingly.
1442 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1443 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1444 if (scaled_freq == 0) {
1445 // Return 0 right away to avoid calculating log2 of 0.
1446 return 0;
1447 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1448 return max_freq_bits;
1449 } else {
1450 return log2_intptr(scaled_freq);
1451 }
1452 }
1453
1454 void Arguments::set_tiered_flags() {
1455 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1456 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1457 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1458 }
1459 if (CompilationPolicyChoice < 2) {
1460 vm_exit_during_initialization(
1461 "Incompatible compilation policy selected", NULL);
1462 }
1463 // Increase the code cache size - tiered compiles a lot more.
1464 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1465 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1466 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1467 }
1468 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1469 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1470 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1471 }
1472 if (!UseInterpreter) { // -Xcomp
1473 Tier3InvokeNotifyFreqLog = 0;
1474 Tier4InvocationThreshold = 0;
1475 }
1476
1477 if (CompileThresholdScaling < 0) {
1478 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1479 }
1480
1481 // Scale tiered compilation thresholds.
1482 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1483 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1484 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1485 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1486
1487 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1488 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1489 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1490 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1491
1492 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1493 // once these thresholds become supported.
1494
1495 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1496 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1497
1498 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1499 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1500
1501 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1502
1503 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1504 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1505 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1506 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1507 }
1508 }
1509
1510 #if INCLUDE_ALL_GCS
1511 static void disable_adaptive_size_policy(const char* collector_name) {
1512 if (UseAdaptiveSizePolicy) {
1513 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1514 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1515 collector_name);
1516 }
1517 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1518 }
1519 }
1520
1521 void Arguments::set_parnew_gc_flags() {
1522 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1523 "control point invariant");
1524 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1525 assert(UseParNewGC, "ParNew should always be used with CMS");
1526
1527 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1528 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1529 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1530 } else if (ParallelGCThreads == 0) {
1531 jio_fprintf(defaultStream::error_stream(),
1532 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1533 vm_exit(1);
1534 }
1535
1536 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1537 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1538 // we set them to 1024 and 1024.
1539 // See CR 6362902.
1540 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1541 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1542 }
1543 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1544 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1545 }
1546
1547 // When using compressed oops, we use local overflow stacks,
1548 // rather than using a global overflow list chained through
1549 // the klass word of the object's pre-image.
1550 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1551 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1552 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1553 }
1554 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1555 }
1556 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1557 }
1558
1559 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1560 // sparc/solaris for certain applications, but would gain from
1561 // further optimization and tuning efforts, and would almost
1562 // certainly gain from analysis of platform and environment.
1563 void Arguments::set_cms_and_parnew_gc_flags() {
1564 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1565 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1566 assert(UseParNewGC, "ParNew should always be used with CMS");
1567
1568 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1569 disable_adaptive_size_policy("UseConcMarkSweepGC");
1570
1571 set_parnew_gc_flags();
1572
1573 size_t max_heap = align_size_down(MaxHeapSize,
1574 CardTableRS::ct_max_alignment_constraint());
1575
1576 // Now make adjustments for CMS
1577 intx tenuring_default = (intx)6;
1578 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1579
1580 // Preferred young gen size for "short" pauses:
1581 // upper bound depends on # of threads and NewRatio.
1582 const size_t preferred_max_new_size_unaligned =
1583 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1584 size_t preferred_max_new_size =
1585 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1586
1587 // Unless explicitly requested otherwise, size young gen
1588 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1589
1590 // If either MaxNewSize or NewRatio is set on the command line,
1591 // assume the user is trying to set the size of the young gen.
1592 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1593
1594 // Set MaxNewSize to our calculated preferred_max_new_size unless
1595 // NewSize was set on the command line and it is larger than
1596 // preferred_max_new_size.
1597 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1598 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1599 } else {
1600 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1601 }
1602 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1603
1604 // Code along this path potentially sets NewSize and OldSize
1605 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1606 min_heap_size(), InitialHeapSize, max_heap);
1607 size_t min_new = preferred_max_new_size;
1608 if (FLAG_IS_CMDLINE(NewSize)) {
1609 min_new = NewSize;
1610 }
1611 if (max_heap > min_new && min_heap_size() > min_new) {
1612 // Unless explicitly requested otherwise, make young gen
1613 // at least min_new, and at most preferred_max_new_size.
1614 if (FLAG_IS_DEFAULT(NewSize)) {
1615 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1616 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1617 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1618 }
1619 // Unless explicitly requested otherwise, size old gen
1620 // so it's NewRatio x of NewSize.
1621 if (FLAG_IS_DEFAULT(OldSize)) {
1622 if (max_heap > NewSize) {
1623 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1624 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1625 }
1626 }
1627 }
1628 }
1629 // Unless explicitly requested otherwise, definitely
1630 // promote all objects surviving "tenuring_default" scavenges.
1631 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1632 FLAG_IS_DEFAULT(SurvivorRatio)) {
1633 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1634 }
1635 // If we decided above (or user explicitly requested)
1636 // `promote all' (via MaxTenuringThreshold := 0),
1637 // prefer minuscule survivor spaces so as not to waste
1638 // space for (non-existent) survivors
1639 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1640 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1641 }
1642
1643 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1644 // but rather the number of free blocks of a given size that are used when
1645 // replenishing the local per-worker free list caches.
1646 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1647 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1648 // OldPLAB sizing manually turned off: Use a larger default setting,
1649 // unless it was manually specified. This is because a too-low value
1650 // will slow down scavenges.
1651 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1652 } else {
1653 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1654 }
1655 }
1656
1657 // If either of the static initialization defaults have changed, note this
1658 // modification.
1659 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1660 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1661 }
1662
1663 if (!ClassUnloading) {
1664 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1665 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1666 }
1667
1668 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1669 }
1670 #endif // INCLUDE_ALL_GCS
1671
1672 void set_object_alignment() {
1673 // Object alignment.
1674 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1675 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1676 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1677 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1678 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1679 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1680
1681 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1682 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1683
1684 // Oop encoding heap max
1685 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1686
1687 if (SurvivorAlignmentInBytes == 0) {
1688 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1689 }
1690
1691 #if INCLUDE_ALL_GCS
1692 // Set CMS global values
1693 CompactibleFreeListSpace::set_cms_values();
1694 #endif // INCLUDE_ALL_GCS
1695 }
1696
1697 size_t Arguments::max_heap_for_compressed_oops() {
1698 // Avoid sign flip.
1699 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1700 // We need to fit both the NULL page and the heap into the memory budget, while
1701 // keeping alignment constraints of the heap. To guarantee the latter, as the
1702 // NULL page is located before the heap, we pad the NULL page to the conservative
1703 // maximum alignment that the GC may ever impose upon the heap.
1704 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1705 _conservative_max_heap_alignment);
1706
1707 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1708 NOT_LP64(ShouldNotReachHere(); return 0);
1709 }
1710
1711 bool Arguments::should_auto_select_low_pause_collector() {
1712 if (UseAutoGCSelectPolicy &&
1713 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1714 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1715 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1716 return true;
1717 }
1718 return false;
1719 }
1720
1721 void Arguments::set_use_compressed_oops() {
1722 #ifndef ZERO
1723 #ifdef _LP64
1724 // MaxHeapSize is not set up properly at this point, but
1725 // the only value that can override MaxHeapSize if we are
1726 // to use UseCompressedOops is InitialHeapSize.
1727 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1728
1729 if (max_heap_size <= max_heap_for_compressed_oops()) {
1730 #if !defined(COMPILER1) || defined(TIERED)
1731 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1732 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1733 }
1734 #endif
1735 } else {
1736 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1737 warning("Max heap size too large for Compressed Oops");
1738 FLAG_SET_DEFAULT(UseCompressedOops, false);
1739 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1740 }
1741 }
1742 #endif // _LP64
1743 #endif // ZERO
1744 }
1745
1746
1747 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1748 // set_use_compressed_oops().
1749 void Arguments::set_use_compressed_klass_ptrs() {
1750 #ifndef ZERO
1751 #ifdef _LP64
1752 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1753 if (!UseCompressedOops) {
1754 if (UseCompressedClassPointers) {
1755 warning("UseCompressedClassPointers requires UseCompressedOops");
1756 }
1757 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1758 } else {
1759 // Turn on UseCompressedClassPointers too
1760 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1761 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1762 }
1763 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1764 if (UseCompressedClassPointers) {
1765 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1766 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1767 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1768 }
1769 }
1770 }
1771 #endif // _LP64
1772 #endif // !ZERO
1773 }
1774
1775 void Arguments::set_conservative_max_heap_alignment() {
1776 // The conservative maximum required alignment for the heap is the maximum of
1777 // the alignments imposed by several sources: any requirements from the heap
1778 // itself, the collector policy and the maximum page size we may run the VM
1779 // with.
1780 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1781 #if INCLUDE_ALL_GCS
1782 if (UseParallelGC) {
1783 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1784 } else if (UseG1GC) {
1785 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1786 }
1787 #endif // INCLUDE_ALL_GCS
1788 _conservative_max_heap_alignment = MAX4(heap_alignment,
1789 (size_t)os::vm_allocation_granularity(),
1790 os::max_page_size(),
1791 CollectorPolicy::compute_heap_alignment());
1792 }
1793
1794 bool Arguments::gc_selected() {
1795 #if INCLUDE_ALL_GCS
1796 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1797 #else
1798 return UseSerialGC;
1799 #endif // INCLUDE_ALL_GCS
1800 }
1801
1802 void Arguments::select_gc_ergonomically() {
1803 #if INCLUDE_ALL_GCS
1804 if (os::is_server_class_machine()) {
1805 if (should_auto_select_low_pause_collector()) {
1806 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1807 } else {
1808 #if defined(JAVASE_EMBEDDED)
1809 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1810 #else
1811 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1812 #endif
1813 }
1814 } else {
1815 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1816 }
1817 #else
1818 UNSUPPORTED_OPTION(UseG1GC);
1819 UNSUPPORTED_OPTION(UseParallelGC);
1820 UNSUPPORTED_OPTION(UseParallelOldGC);
1821 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1822 UNSUPPORTED_OPTION(UseParNewGC);
1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1824 #endif // INCLUDE_ALL_GCS
1825 }
1826
1827 void Arguments::select_gc() {
1828 if (!gc_selected()) {
1829 select_gc_ergonomically();
1830 if (!gc_selected()) {
1831 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1832 }
1833 }
1834 }
1835
1836 void Arguments::set_ergonomics_flags() {
1837 select_gc();
1838
1839 #if defined(COMPILER2) || INCLUDE_JVMCI
1840 // Shared spaces work fine with other GCs but causes bytecode rewriting
1841 // to be disabled, which hurts interpreter performance and decreases
1842 // server performance. When -server is specified, keep the default off
1843 // unless it is asked for. Future work: either add bytecode rewriting
1844 // at link time, or rewrite bytecodes in non-shared methods.
1845 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1846 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1847 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1848 }
1849 #endif
1850
1851 set_conservative_max_heap_alignment();
1852
1853 #ifndef ZERO
1854 #ifdef _LP64
1855 set_use_compressed_oops();
1856
1857 // set_use_compressed_klass_ptrs() must be called after calling
1858 // set_use_compressed_oops().
1859 set_use_compressed_klass_ptrs();
1860
1861 // Also checks that certain machines are slower with compressed oops
1862 // in vm_version initialization code.
1863 #endif // _LP64
1864 #endif // !ZERO
1865
1866 CodeCacheExtensions::set_ergonomics_flags();
1867 }
1868
1869 void Arguments::set_parallel_gc_flags() {
1870 assert(UseParallelGC || UseParallelOldGC, "Error");
1871 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1872 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1873 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1874 }
1875 FLAG_SET_DEFAULT(UseParallelGC, true);
1876
1877 // If no heap maximum was requested explicitly, use some reasonable fraction
1878 // of the physical memory, up to a maximum of 1GB.
1879 FLAG_SET_DEFAULT(ParallelGCThreads,
1880 Abstract_VM_Version::parallel_worker_threads());
1881 if (ParallelGCThreads == 0) {
1882 jio_fprintf(defaultStream::error_stream(),
1883 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1884 vm_exit(1);
1885 }
1886
1887 if (UseAdaptiveSizePolicy) {
1888 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1889 // unless the user actually sets these flags.
1890 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1891 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1892 }
1893 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1894 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1895 }
1896 }
1897
1898 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1899 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1900 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1901 // See CR 6362902 for details.
1902 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1903 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1904 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1905 }
1906 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1907 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1908 }
1909 }
1910
1911 if (UseParallelOldGC) {
1912 // Par compact uses lower default values since they are treated as
1913 // minimums. These are different defaults because of the different
1914 // interpretation and are not ergonomically set.
1915 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1916 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1917 }
1918 }
1919 }
1920
1921 void Arguments::set_g1_gc_flags() {
1922 assert(UseG1GC, "Error");
1923 #if defined(COMPILER1) || INCLUDE_JVMCI
1924 FastTLABRefill = false;
1925 #endif
1926 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1927 if (ParallelGCThreads == 0) {
1928 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1929 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1930 }
1931
1932 #if INCLUDE_ALL_GCS
1933 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1934 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1935 }
1936 #endif
1937
1938 // MarkStackSize will be set (if it hasn't been set by the user)
1939 // when concurrent marking is initialized.
1940 // Its value will be based upon the number of parallel marking threads.
1941 // But we do set the maximum mark stack size here.
1942 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1943 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1944 }
1945
1946 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1947 // In G1, we want the default GC overhead goal to be higher than
1948 // it is for PS, or the heap might be expanded too aggressively.
1949 // We set it here to ~8%.
1950 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1951 }
1952
1953 // Below, we might need to calculate the pause time interval based on
1954 // the pause target. When we do so we are going to give G1 maximum
1955 // flexibility and allow it to do pauses when it needs to. So, we'll
1956 // arrange that the pause interval to be pause time target + 1 to
1957 // ensure that a) the pause time target is maximized with respect to
1958 // the pause interval and b) we maintain the invariant that pause
1959 // time target < pause interval. If the user does not want this
1960 // maximum flexibility, they will have to set the pause interval
1961 // explicitly.
1962
1963 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1964 // The default pause time target in G1 is 200ms
1965 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1966 }
1967
1968 // Then, if the interval parameter was not set, set it according to
1969 // the pause time target (this will also deal with the case when the
1970 // pause time target is the default value).
1971 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1972 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1973 }
1974
1975 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1976 }
1977
1978 void Arguments::set_gc_specific_flags() {
1979 #if INCLUDE_ALL_GCS
1980 // Set per-collector flags
1981 if (UseParallelGC || UseParallelOldGC) {
1982 set_parallel_gc_flags();
1983 } else if (UseConcMarkSweepGC) {
1984 set_cms_and_parnew_gc_flags();
1985 } else if (UseG1GC) {
1986 set_g1_gc_flags();
1987 }
1988 if (AssumeMP && !UseSerialGC) {
1989 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1990 warning("If the number of processors is expected to increase from one, then"
1991 " you should configure the number of parallel GC threads appropriately"
1992 " using -XX:ParallelGCThreads=N");
1993 }
1994 }
1995 if (MinHeapFreeRatio == 100) {
1996 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1997 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1998 }
1999 #endif // INCLUDE_ALL_GCS
2000 }
2001
2002 julong Arguments::limit_by_allocatable_memory(julong limit) {
2003 julong max_allocatable;
2004 julong result = limit;
2005 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2006 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2007 }
2008 return result;
2009 }
2010
2011 // Use static initialization to get the default before parsing
2012 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2013
2014 void Arguments::set_heap_size() {
2015 const julong phys_mem =
2016 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2017 : (julong)MaxRAM;
2018
2019 // If the maximum heap size has not been set with -Xmx,
2020 // then set it as fraction of the size of physical memory,
2021 // respecting the maximum and minimum sizes of the heap.
2022 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2023 julong reasonable_max = phys_mem / MaxRAMFraction;
2024
2025 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2026 // Small physical memory, so use a minimum fraction of it for the heap
2027 reasonable_max = phys_mem / MinRAMFraction;
2028 } else {
2029 // Not-small physical memory, so require a heap at least
2030 // as large as MaxHeapSize
2031 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2032 }
2033 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2034 // Limit the heap size to ErgoHeapSizeLimit
2035 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2036 }
2037 if (UseCompressedOops) {
2038 // Limit the heap size to the maximum possible when using compressed oops
2039 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2040
2041 // HeapBaseMinAddress can be greater than default but not less than.
2042 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2043 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2044 // matches compressed oops printing flags
2045 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2046 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2047 DefaultHeapBaseMinAddress,
2048 DefaultHeapBaseMinAddress/G,
2049 HeapBaseMinAddress);
2050 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2051 }
2052 }
2053
2054 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2055 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2056 // but it should be not less than default MaxHeapSize.
2057 max_coop_heap -= HeapBaseMinAddress;
2058 }
2059 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2060 }
2061 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2062
2063 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2064 // An initial heap size was specified on the command line,
2065 // so be sure that the maximum size is consistent. Done
2066 // after call to limit_by_allocatable_memory because that
2067 // method might reduce the allocation size.
2068 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2069 }
2070
2071 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2072 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2073 }
2074
2075 // If the minimum or initial heap_size have not been set or requested to be set
2076 // ergonomically, set them accordingly.
2077 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2078 julong reasonable_minimum = (julong)(OldSize + NewSize);
2079
2080 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2081
2082 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2083
2084 if (InitialHeapSize == 0) {
2085 julong reasonable_initial = phys_mem / InitialRAMFraction;
2086
2087 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2088 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2089
2090 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2091
2092 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2094 }
2095 // If the minimum heap size has not been set (via -Xms),
2096 // synchronize with InitialHeapSize to avoid errors with the default value.
2097 if (min_heap_size() == 0) {
2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2099 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2100 }
2101 }
2102 }
2103
2104 // This option inspects the machine and attempts to set various
2105 // parameters to be optimal for long-running, memory allocation
2106 // intensive jobs. It is intended for machines with large
2107 // amounts of cpu and memory.
2108 jint Arguments::set_aggressive_heap_flags() {
2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2110 // VM, but we may not be able to represent the total physical memory
2111 // available (like having 8gb of memory on a box but using a 32bit VM).
2112 // Thus, we need to make sure we're using a julong for intermediate
2113 // calculations.
2114 julong initHeapSize;
2115 julong total_memory = os::physical_memory();
2116
2117 if (total_memory < (julong) 256 * M) {
2118 jio_fprintf(defaultStream::error_stream(),
2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2120 vm_exit(1);
2121 }
2122
2123 // The heap size is half of available memory, or (at most)
2124 // all of possible memory less 160mb (leaving room for the OS
2125 // when using ISM). This is the maximum; because adaptive sizing
2126 // is turned on below, the actual space used may be smaller.
2127
2128 initHeapSize = MIN2(total_memory / (julong) 2,
2129 total_memory - (julong) 160 * M);
2130
2131 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2132
2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2134 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2135 return JNI_EINVAL;
2136 }
2137 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 // Currently the minimum size and the initial heap sizes are the same.
2141 set_min_heap_size(initHeapSize);
2142 }
2143 if (FLAG_IS_DEFAULT(NewSize)) {
2144 // Make the young generation 3/8ths of the total heap.
2145 if (FLAG_SET_CMDLINE(size_t, NewSize,
2146 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2147 return JNI_EINVAL;
2148 }
2149 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2150 return JNI_EINVAL;
2151 }
2152 }
2153
2154 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2155 FLAG_SET_DEFAULT(UseLargePages, true);
2156 #endif
2157
2158 // Increase some data structure sizes for efficiency
2159 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2166 return JNI_EINVAL;
2167 }
2168
2169 // See the OldPLABSize comment below, but replace 'after promotion'
2170 // with 'after copying'. YoungPLABSize is the size of the survivor
2171 // space per-gc-thread buffers. The default is 4kw.
2172 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2173 return JNI_EINVAL;
2174 }
2175
2176 // OldPLABSize is the size of the buffers in the old gen that
2177 // UseParallelGC uses to promote live data that doesn't fit in the
2178 // survivor spaces. At any given time, there's one for each gc thread.
2179 // The default size is 1kw. These buffers are rarely used, since the
2180 // survivor spaces are usually big enough. For specjbb, however, there
2181 // are occasions when there's lots of live data in the young gen
2182 // and we end up promoting some of it. We don't have a definite
2183 // explanation for why bumping OldPLABSize helps, but the theory
2184 // is that a bigger PLAB results in retaining something like the
2185 // original allocation order after promotion, which improves mutator
2186 // locality. A minor effect may be that larger PLABs reduce the
2187 // number of PLAB allocation events during gc. The value of 8kw
2188 // was arrived at by experimenting with specjbb.
2189 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2190 return JNI_EINVAL;
2191 }
2192
2193 // Enable parallel GC and adaptive generation sizing
2194 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2195 return JNI_EINVAL;
2196 }
2197 FLAG_SET_DEFAULT(ParallelGCThreads,
2198 Abstract_VM_Version::parallel_worker_threads());
2199
2200 // Encourage steady state memory management
2201 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2202 return JNI_EINVAL;
2203 }
2204
2205 // This appears to improve mutator locality
2206 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2207 return JNI_EINVAL;
2208 }
2209
2210 // Get around early Solaris scheduling bug
2211 // (affinity vs other jobs on system)
2212 // but disallow DR and offlining (5008695).
2213 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2214 return JNI_EINVAL;
2215 }
2216
2217 return JNI_OK;
2218 }
2219
2220 // This must be called after ergonomics.
2221 void Arguments::set_bytecode_flags() {
2222 if (!RewriteBytecodes) {
2223 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2224 }
2225 }
2226
2227 // Aggressive optimization flags -XX:+AggressiveOpts
2228 jint Arguments::set_aggressive_opts_flags() {
2229 #ifdef COMPILER2
2230 if (AggressiveUnboxing) {
2231 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2232 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2233 } else if (!EliminateAutoBox) {
2234 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2235 AggressiveUnboxing = false;
2236 }
2237 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2238 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2239 } else if (!DoEscapeAnalysis) {
2240 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2241 AggressiveUnboxing = false;
2242 }
2243 }
2244 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2246 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2247 }
2248 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2249 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2250 }
2251
2252 // Feed the cache size setting into the JDK
2253 char buffer[1024];
2254 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2255 if (!add_property(buffer)) {
2256 return JNI_ENOMEM;
2257 }
2258 }
2259 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2260 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2261 }
2262 #endif
2263
2264 if (AggressiveOpts) {
2265 // Sample flag setting code
2266 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2267 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2268 // }
2269 }
2270
2271 return JNI_OK;
2272 }
2273
2274 //===========================================================================================================
2275 // Parsing of java.compiler property
2276
2277 void Arguments::process_java_compiler_argument(const char* arg) {
2278 // For backwards compatibility, Djava.compiler=NONE or ""
2279 // causes us to switch to -Xint mode UNLESS -Xdebug
2280 // is also specified.
2281 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2282 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2283 }
2284 }
2285
2286 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2287 _sun_java_launcher = os::strdup_check_oom(launcher);
2288 }
2289
2290 bool Arguments::created_by_java_launcher() {
2291 assert(_sun_java_launcher != NULL, "property must have value");
2292 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2293 }
2294
2295 bool Arguments::sun_java_launcher_is_altjvm() {
2296 return _sun_java_launcher_is_altjvm;
2297 }
2298
2299 //===========================================================================================================
2300 // Parsing of main arguments
2301
2302 #if INCLUDE_JVMCI
2303 // Check consistency of jvmci vm argument settings.
2304 bool Arguments::check_jvmci_args_consistency() {
2305 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2306 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2307 return false;
2308 }
2309 return true;
2310 }
2311 #endif //INCLUDE_JVMCI
2312
2313 // Check consistency of GC selection
2314 bool Arguments::check_gc_consistency() {
2315 // Ensure that the user has not selected conflicting sets
2316 // of collectors.
2317 uint i = 0;
2318 if (UseSerialGC) i++;
2319 if (UseConcMarkSweepGC) i++;
2320 if (UseParallelGC || UseParallelOldGC) i++;
2321 if (UseG1GC) i++;
2322 if (i > 1) {
2323 jio_fprintf(defaultStream::error_stream(),
2324 "Conflicting collector combinations in option list; "
2325 "please refer to the release notes for the combinations "
2326 "allowed\n");
2327 return false;
2328 }
2329
2330 if (UseConcMarkSweepGC && !UseParNewGC) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2333 return false;
2334 }
2335
2336 if (UseParNewGC && !UseConcMarkSweepGC) {
2337 jio_fprintf(defaultStream::error_stream(),
2338 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2339 return false;
2340 }
2341
2342 return true;
2343 }
2344
2345 // Check the consistency of vm_init_args
2346 bool Arguments::check_vm_args_consistency() {
2347 // Method for adding checks for flag consistency.
2348 // The intent is to warn the user of all possible conflicts,
2349 // before returning an error.
2350 // Note: Needs platform-dependent factoring.
2351 bool status = true;
2352
2353 if (TLABRefillWasteFraction == 0) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "TLABRefillWasteFraction should be a denominator, "
2356 "not " SIZE_FORMAT "\n",
2357 TLABRefillWasteFraction);
2358 status = false;
2359 }
2360
2361 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2362 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2363 }
2364
2365 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2366 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2367 }
2368
2369 if (GCTimeLimit == 100) {
2370 // Turn off gc-overhead-limit-exceeded checks
2371 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2372 }
2373
2374 status = status && check_gc_consistency();
2375
2376 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2377 // insists that we hold the requisite locks so that the iteration is
2378 // MT-safe. For the verification at start-up and shut-down, we don't
2379 // yet have a good way of acquiring and releasing these locks,
2380 // which are not visible at the CollectedHeap level. We want to
2381 // be able to acquire these locks and then do the iteration rather
2382 // than just disable the lock verification. This will be fixed under
2383 // bug 4788986.
2384 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2385 if (VerifyDuringStartup) {
2386 warning("Heap verification at start-up disabled "
2387 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2388 VerifyDuringStartup = false; // Disable verification at start-up
2389 }
2390
2391 if (VerifyBeforeExit) {
2392 warning("Heap verification at shutdown disabled "
2393 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2394 VerifyBeforeExit = false; // Disable verification at shutdown
2395 }
2396 }
2397
2398 if (PrintNMTStatistics) {
2399 #if INCLUDE_NMT
2400 if (MemTracker::tracking_level() == NMT_off) {
2401 #endif // INCLUDE_NMT
2402 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2403 PrintNMTStatistics = false;
2404 #if INCLUDE_NMT
2405 }
2406 #endif
2407 }
2408 #if INCLUDE_JVMCI
2409
2410 status = status && check_jvmci_args_consistency();
2411
2412 if (EnableJVMCI) {
2413 if (!ScavengeRootsInCode) {
2414 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2415 ScavengeRootsInCode = 1;
2416 }
2417 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2418 TypeProfileLevel = 0;
2419 }
2420 if (UseJVMCICompiler) {
2421 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2422 TypeProfileWidth = 8;
2423 }
2424 }
2425 }
2426 #endif
2427
2428 // Check lower bounds of the code cache
2429 // Template Interpreter code is approximately 3X larger in debug builds.
2430 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2431 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2434 os::vm_page_size()/K);
2435 status = false;
2436 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2439 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2440 status = false;
2441 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2444 min_code_cache_size/K);
2445 status = false;
2446 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2447 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2450 CODE_CACHE_SIZE_LIMIT/M);
2451 status = false;
2452 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2455 min_code_cache_size/K);
2456 status = false;
2457 }
2458
2459 #ifdef _LP64
2460 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2461 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2462 }
2463 #endif
2464
2465 #ifndef SUPPORT_RESERVED_STACK_AREA
2466 if (StackReservedPages != 0) {
2467 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2468 warning("Reserved Stack Area not supported on this platform");
2469 }
2470 #endif
2471
2472 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2473 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2474 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2475 }
2476 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2477 }
2478 if (UseCompiler && is_interpreter_only()) {
2479 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2480 warning("UseCompiler disabled due to -Xint.");
2481 }
2482 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2483 }
2484 #ifdef COMPILER2
2485 if (PostLoopMultiversioning && !RangeCheckElimination) {
2486 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2487 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2488 }
2489 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2490 }
2491 #endif
2492 return status;
2493 }
2494
2495 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2496 const char* option_type) {
2497 if (ignore) return false;
2498
2499 const char* spacer = " ";
2500 if (option_type == NULL) {
2501 option_type = ++spacer; // Set both to the empty string.
2502 }
2503
2504 if (os::obsolete_option(option)) {
2505 jio_fprintf(defaultStream::error_stream(),
2506 "Obsolete %s%soption: %s\n", option_type, spacer,
2507 option->optionString);
2508 return false;
2509 } else {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Unrecognized %s%soption: %s\n", option_type, spacer,
2512 option->optionString);
2513 return true;
2514 }
2515 }
2516
2517 static const char* user_assertion_options[] = {
2518 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2519 };
2520
2521 static const char* system_assertion_options[] = {
2522 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2523 };
2524
2525 bool Arguments::parse_uintx(const char* value,
2526 uintx* uintx_arg,
2527 uintx min_size) {
2528
2529 // Check the sign first since atojulong() parses only unsigned values.
2530 bool value_is_positive = !(*value == '-');
2531
2532 if (value_is_positive) {
2533 julong n;
2534 bool good_return = atojulong(value, &n);
2535 if (good_return) {
2536 bool above_minimum = n >= min_size;
2537 bool value_is_too_large = n > max_uintx;
2538
2539 if (above_minimum && !value_is_too_large) {
2540 *uintx_arg = n;
2541 return true;
2542 }
2543 }
2544 }
2545 return false;
2546 }
2547
2548 unsigned int addreads_count = 0;
2549 unsigned int addexports_count = 0;
2550 unsigned int patch_mod_count = 0;
2551 const char* add_modules_value = NULL;
2552
2553 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2554 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2555 char* property = AllocateHeap(prop_len, mtArguments);
2556 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2557 if (ret < 0 || ret >= (int)prop_len) {
2558 FreeHeap(property);
2559 return false;
2560 }
2561 bool added = add_property(property, UnwriteableProperty, internal);
2562 FreeHeap(property);
2563 return added;
2564 }
2565
2566 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2567 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2568 if (count < 1000) {
2569 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2570 char* property = AllocateHeap(prop_len, mtArguments);
2571 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2572 if (ret < 0 || ret >= (int)prop_len) {
2573 FreeHeap(property);
2574 return false;
2575 }
2576 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2577 FreeHeap(property);
2578 return added;
2579 }
2580 return false;
2581 }
2582
2583 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2584 julong* long_arg,
2585 julong min_size) {
2586 if (!atojulong(s, long_arg)) return arg_unreadable;
2587 return check_memory_size(*long_arg, min_size);
2588 }
2589
2590 // Parse JavaVMInitArgs structure
2591
2592 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2593 const JavaVMInitArgs *java_options_args,
2594 const JavaVMInitArgs *cmd_line_args) {
2595 bool patch_mod_javabase = false;
2596
2597 // Save default settings for some mode flags
2598 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2599 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2600 Arguments::_ClipInlining = ClipInlining;
2601 Arguments::_BackgroundCompilation = BackgroundCompilation;
2602 if (TieredCompilation) {
2603 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2604 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2605 }
2606
2607 // Setup flags for mixed which is the default
2608 set_mode_flags(_mixed);
2609
2610 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2611 // variable (if present).
2612 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2613 if (result != JNI_OK) {
2614 return result;
2615 }
2616
2617 // Parse args structure generated from the command line flags.
2618 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2619 if (result != JNI_OK) {
2620 return result;
2621 }
2622
2623 // Parse args structure generated from the _JAVA_OPTIONS environment
2624 // variable (if present) (mimics classic VM)
2625 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2626 if (result != JNI_OK) {
2627 return result;
2628 }
2629
2630 // Do final processing now that all arguments have been parsed
2631 result = finalize_vm_init_args();
2632 if (result != JNI_OK) {
2633 return result;
2634 }
2635
2636 return JNI_OK;
2637 }
2638
2639 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2640 // represents a valid JDWP agent. is_path==true denotes that we
2641 // are dealing with -agentpath (case where name is a path), otherwise with
2642 // -agentlib
2643 bool valid_jdwp_agent(char *name, bool is_path) {
2644 char *_name;
2645 const char *_jdwp = "jdwp";
2646 size_t _len_jdwp, _len_prefix;
2647
2648 if (is_path) {
2649 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2650 return false;
2651 }
2652
2653 _name++; // skip past last path separator
2654 _len_prefix = strlen(JNI_LIB_PREFIX);
2655
2656 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2657 return false;
2658 }
2659
2660 _name += _len_prefix;
2661 _len_jdwp = strlen(_jdwp);
2662
2663 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2664 _name += _len_jdwp;
2665 }
2666 else {
2667 return false;
2668 }
2669
2670 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2671 return false;
2672 }
2673
2674 return true;
2675 }
2676
2677 if (strcmp(name, _jdwp) == 0) {
2678 return true;
2679 }
2680
2681 return false;
2682 }
2683
2684 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2685 // --patch-module=<module>=<file>(<pathsep><file>)*
2686 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2687 // Find the equal sign between the module name and the path specification
2688 const char* module_equal = strchr(patch_mod_tail, '=');
2689 if (module_equal == NULL) {
2690 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2691 return JNI_ERR;
2692 } else {
2693 // Pick out the module name
2694 size_t module_len = module_equal - patch_mod_tail;
2695 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2696 if (module_name != NULL) {
2697 memcpy(module_name, patch_mod_tail, module_len);
2698 *(module_name + module_len) = '\0';
2699 // The path piece begins one past the module_equal sign
2700 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2701 FREE_C_HEAP_ARRAY(char, module_name);
2702 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2703 return JNI_ENOMEM;
2704 }
2705 } else {
2706 return JNI_ENOMEM;
2707 }
2708 }
2709 return JNI_OK;
2710 }
2711
2712 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2713 // For match_option to return remaining or value part of option string
2714 const char* tail;
2715
2716 // iterate over arguments
2717 for (int index = 0; index < args->nOptions; index++) {
2718 bool is_absolute_path = false; // for -agentpath vs -agentlib
2719
2720 const JavaVMOption* option = args->options + index;
2721
2722 if (!match_option(option, "-Djava.class.path", &tail) &&
2723 !match_option(option, "-Dsun.java.command", &tail) &&
2724 !match_option(option, "-Dsun.java.launcher", &tail)) {
2725
2726 // add all jvm options to the jvm_args string. This string
2727 // is used later to set the java.vm.args PerfData string constant.
2728 // the -Djava.class.path and the -Dsun.java.command options are
2729 // omitted from jvm_args string as each have their own PerfData
2730 // string constant object.
2731 build_jvm_args(option->optionString);
2732 }
2733
2734 // -verbose:[class/gc/jni]
2735 if (match_option(option, "-verbose", &tail)) {
2736 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2737 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2738 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2739 } else if (!strcmp(tail, ":gc")) {
2740 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2741 } else if (!strcmp(tail, ":jni")) {
2742 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 }
2746 // -da / -ea / -disableassertions / -enableassertions
2747 // These accept an optional class/package name separated by a colon, e.g.,
2748 // -da:java.lang.Thread.
2749 } else if (match_option(option, user_assertion_options, &tail, true)) {
2750 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2751 if (*tail == '\0') {
2752 JavaAssertions::setUserClassDefault(enable);
2753 } else {
2754 assert(*tail == ':', "bogus match by match_option()");
2755 JavaAssertions::addOption(tail + 1, enable);
2756 }
2757 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2758 } else if (match_option(option, system_assertion_options, &tail, false)) {
2759 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2760 JavaAssertions::setSystemClassDefault(enable);
2761 // -bootclasspath:
2762 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2763 jio_fprintf(defaultStream::output_stream(),
2764 "-Xbootclasspath is no longer a supported option.\n");
2765 return JNI_EINVAL;
2766 // -bootclasspath/a:
2767 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2768 Arguments::set_bootclassloader_append_index((int)strlen(Arguments::get_sysclasspath())+1);
2769 Arguments::append_sysclasspath(tail);
2770 // -bootclasspath/p:
2771 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2772 jio_fprintf(defaultStream::output_stream(),
2773 "-Xbootclasspath/p is no longer a supported option.\n");
2774 return JNI_EINVAL;
2775 // -Xrun
2776 } else if (match_option(option, "-Xrun", &tail)) {
2777 if (tail != NULL) {
2778 const char* pos = strchr(tail, ':');
2779 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2780 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2781 name[len] = '\0';
2782
2783 char *options = NULL;
2784 if(pos != NULL) {
2785 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2786 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2787 }
2788 #if !INCLUDE_JVMTI
2789 if (strcmp(name, "jdwp") == 0) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Debugging agents are not supported in this VM\n");
2792 return JNI_ERR;
2793 }
2794 #endif // !INCLUDE_JVMTI
2795 add_init_library(name, options);
2796 }
2797 } else if (match_option(option, "--add-reads=", &tail)) {
2798 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2799 return JNI_ENOMEM;
2800 }
2801 } else if (match_option(option, "--add-exports=", &tail)) {
2802 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2803 return JNI_ENOMEM;
2804 }
2805 } else if (match_option(option, "--add-modules=", &tail)) {
2806 add_modules_value = tail;
2807 } else if (match_option(option, "--limit-modules=", &tail)) {
2808 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2809 return JNI_ENOMEM;
2810 }
2811 } else if (match_option(option, "--module-path=", &tail)) {
2812 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2813 return JNI_ENOMEM;
2814 }
2815 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2816 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2817 return JNI_ENOMEM;
2818 }
2819 } else if (match_option(option, "--patch-module=", &tail)) {
2820 // --patch-module=<module>=<file>(<pathsep><file>)*
2821 int res = process_patch_mod_option(tail, patch_mod_javabase);
2822 if (res != JNI_OK) {
2823 return res;
2824 }
2825 // -agentlib and -agentpath
2826 } else if (match_option(option, "-agentlib:", &tail) ||
2827 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2828 if(tail != NULL) {
2829 const char* pos = strchr(tail, '=');
2830 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2831 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2832 name[len] = '\0';
2833
2834 char *options = NULL;
2835 if(pos != NULL) {
2836 options = os::strdup_check_oom(pos + 1, mtArguments);
2837 }
2838 #if !INCLUDE_JVMTI
2839 if (valid_jdwp_agent(name, is_absolute_path)) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Debugging agents are not supported in this VM\n");
2842 return JNI_ERR;
2843 }
2844 #endif // !INCLUDE_JVMTI
2845 add_init_agent(name, options, is_absolute_path);
2846 }
2847 // -javaagent
2848 } else if (match_option(option, "-javaagent:", &tail)) {
2849 #if !INCLUDE_JVMTI
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Instrumentation agents are not supported in this VM\n");
2852 return JNI_ERR;
2853 #else
2854 if (tail != NULL) {
2855 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2856 add_init_agent("instrument", options, false);
2857 // java agents need module java.instrument
2858 if (!Arguments::append_to_addmods_property("java.instrument")) {
2859 return JNI_ENOMEM;
2860 }
2861 }
2862 #endif // !INCLUDE_JVMTI
2863 // -Xnoclassgc
2864 } else if (match_option(option, "-Xnoclassgc")) {
2865 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 // -Xconcgc
2869 } else if (match_option(option, "-Xconcgc")) {
2870 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 // -Xnoconcgc
2874 } else if (match_option(option, "-Xnoconcgc")) {
2875 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 // -Xbatch
2879 } else if (match_option(option, "-Xbatch")) {
2880 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 // -Xmn for compatibility with other JVM vendors
2884 } else if (match_option(option, "-Xmn", &tail)) {
2885 julong long_initial_young_size = 0;
2886 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2887 if (errcode != arg_in_range) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Invalid initial young generation size: %s\n", option->optionString);
2890 describe_range_error(errcode);
2891 return JNI_EINVAL;
2892 }
2893 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 // -Xms
2900 } else if (match_option(option, "-Xms", &tail)) {
2901 julong long_initial_heap_size = 0;
2902 // an initial heap size of 0 means automatically determine
2903 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2904 if (errcode != arg_in_range) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Invalid initial heap size: %s\n", option->optionString);
2907 describe_range_error(errcode);
2908 return JNI_EINVAL;
2909 }
2910 set_min_heap_size((size_t)long_initial_heap_size);
2911 // Currently the minimum size and the initial heap sizes are the same.
2912 // Can be overridden with -XX:InitialHeapSize.
2913 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // -Xmx
2917 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2918 julong long_max_heap_size = 0;
2919 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2920 if (errcode != arg_in_range) {
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Invalid maximum heap size: %s\n", option->optionString);
2923 describe_range_error(errcode);
2924 return JNI_EINVAL;
2925 }
2926 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 // Xmaxf
2930 } else if (match_option(option, "-Xmaxf", &tail)) {
2931 char* err;
2932 int maxf = (int)(strtod(tail, &err) * 100);
2933 if (*err != '\0' || *tail == '\0') {
2934 jio_fprintf(defaultStream::error_stream(),
2935 "Bad max heap free percentage size: %s\n",
2936 option->optionString);
2937 return JNI_EINVAL;
2938 } else {
2939 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 }
2943 // Xminf
2944 } else if (match_option(option, "-Xminf", &tail)) {
2945 char* err;
2946 int minf = (int)(strtod(tail, &err) * 100);
2947 if (*err != '\0' || *tail == '\0') {
2948 jio_fprintf(defaultStream::error_stream(),
2949 "Bad min heap free percentage size: %s\n",
2950 option->optionString);
2951 return JNI_EINVAL;
2952 } else {
2953 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 }
2957 // -Xss
2958 } else if (match_option(option, "-Xss", &tail)) {
2959 julong long_ThreadStackSize = 0;
2960 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2961 if (errcode != arg_in_range) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Invalid thread stack size: %s\n", option->optionString);
2964 describe_range_error(errcode);
2965 return JNI_EINVAL;
2966 }
2967 // Internally track ThreadStackSize in units of 1024 bytes.
2968 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2969 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2973 } else if (match_option(option, "-Xoss", &tail) ||
2974 match_option(option, "-Xsqnopause") ||
2975 match_option(option, "-Xoptimize") ||
2976 match_option(option, "-Xboundthreads") ||
2977 match_option(option, "-Xusealtsigs")) {
2978 // All these options are deprecated in JDK 9 and will be removed in a future release
2979 char version[256];
2980 JDK_Version::jdk(9).to_string(version, sizeof(version));
2981 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2982 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2983 julong long_CodeCacheExpansionSize = 0;
2984 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2985 if (errcode != arg_in_range) {
2986 jio_fprintf(defaultStream::error_stream(),
2987 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2988 os::vm_page_size()/K);
2989 return JNI_EINVAL;
2990 }
2991 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2995 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2996 julong long_ReservedCodeCacheSize = 0;
2997
2998 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2999 if (errcode != arg_in_range) {
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Invalid maximum code cache size: %s.\n", option->optionString);
3002 return JNI_EINVAL;
3003 }
3004 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 // -XX:NonNMethodCodeHeapSize=
3008 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3009 julong long_NonNMethodCodeHeapSize = 0;
3010
3011 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3012 if (errcode != arg_in_range) {
3013 jio_fprintf(defaultStream::error_stream(),
3014 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3015 return JNI_EINVAL;
3016 }
3017 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3018 return JNI_EINVAL;
3019 }
3020 // -XX:ProfiledCodeHeapSize=
3021 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3022 julong long_ProfiledCodeHeapSize = 0;
3023
3024 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3025 if (errcode != arg_in_range) {
3026 jio_fprintf(defaultStream::error_stream(),
3027 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3028 return JNI_EINVAL;
3029 }
3030 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 // -XX:NonProfiledCodeHeapSizee=
3034 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3035 julong long_NonProfiledCodeHeapSize = 0;
3036
3037 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3038 if (errcode != arg_in_range) {
3039 jio_fprintf(defaultStream::error_stream(),
3040 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3041 return JNI_EINVAL;
3042 }
3043 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 // -green
3047 } else if (match_option(option, "-green")) {
3048 jio_fprintf(defaultStream::error_stream(),
3049 "Green threads support not available\n");
3050 return JNI_EINVAL;
3051 // -native
3052 } else if (match_option(option, "-native")) {
3053 // HotSpot always uses native threads, ignore silently for compatibility
3054 // -Xrs
3055 } else if (match_option(option, "-Xrs")) {
3056 // Classic/EVM option, new functionality
3057 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xprof
3061 } else if (match_option(option, "-Xprof")) {
3062 #if INCLUDE_FPROF
3063 _has_profile = true;
3064 #else // INCLUDE_FPROF
3065 jio_fprintf(defaultStream::error_stream(),
3066 "Flat profiling is not supported in this VM.\n");
3067 return JNI_ERR;
3068 #endif // INCLUDE_FPROF
3069 // -Xconcurrentio
3070 } else if (match_option(option, "-Xconcurrentio")) {
3071 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3084 return JNI_EINVAL;
3085 }
3086
3087 // -Xinternalversion
3088 } else if (match_option(option, "-Xinternalversion")) {
3089 jio_fprintf(defaultStream::output_stream(), "%s\n",
3090 VM_Version::internal_vm_info_string());
3091 vm_exit(0);
3092 #ifndef PRODUCT
3093 // -Xprintflags
3094 } else if (match_option(option, "-Xprintflags")) {
3095 CommandLineFlags::printFlags(tty, false);
3096 vm_exit(0);
3097 #endif
3098 // -D
3099 } else if (match_option(option, "-D", &tail)) {
3100 const char* value;
3101 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3102 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3103 // abort if -Djava.endorsed.dirs is set
3104 jio_fprintf(defaultStream::output_stream(),
3105 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3106 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3107 return JNI_EINVAL;
3108 }
3109 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3110 *value != '\0' && strcmp(value, "\"\"") != 0) {
3111 // abort if -Djava.ext.dirs is set
3112 jio_fprintf(defaultStream::output_stream(),
3113 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3114 return JNI_EINVAL;
3115 }
3116 // Check for module related properties. They must be set using the modules
3117 // options. For example: use "--add-modules=java.sql", not
3118 // "-Djdk.module.addmods=java.sql"
3119 if (is_internal_module_property(option->optionString + 2)) {
3120 needs_module_property_warning = true;
3121 continue;
3122 }
3123
3124 if (!add_property(tail)) {
3125 return JNI_ENOMEM;
3126 }
3127 // Out of the box management support
3128 if (match_option(option, "-Dcom.sun.management", &tail)) {
3129 #if INCLUDE_MANAGEMENT
3130 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 // management agent in module java.management
3134 if (!Arguments::append_to_addmods_property("java.management")) {
3135 return JNI_ENOMEM;
3136 }
3137 #else
3138 jio_fprintf(defaultStream::output_stream(),
3139 "-Dcom.sun.management is not supported in this VM.\n");
3140 return JNI_ERR;
3141 #endif
3142 }
3143 // -Xint
3144 } else if (match_option(option, "-Xint")) {
3145 set_mode_flags(_int);
3146 // -Xmixed
3147 } else if (match_option(option, "-Xmixed")) {
3148 set_mode_flags(_mixed);
3149 // -Xcomp
3150 } else if (match_option(option, "-Xcomp")) {
3151 // for testing the compiler; turn off all flags that inhibit compilation
3152 set_mode_flags(_comp);
3153 // -Xshare:dump
3154 } else if (match_option(option, "-Xshare:dump")) {
3155 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3156 return JNI_EINVAL;
3157 }
3158 set_mode_flags(_int); // Prevent compilation, which creates objects
3159 // -Xshare:on
3160 } else if (match_option(option, "-Xshare:on")) {
3161 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3162 return JNI_EINVAL;
3163 }
3164 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3165 return JNI_EINVAL;
3166 }
3167 // -Xshare:auto
3168 } else if (match_option(option, "-Xshare:auto")) {
3169 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3173 return JNI_EINVAL;
3174 }
3175 // -Xshare:off
3176 } else if (match_option(option, "-Xshare:off")) {
3177 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 // -Xverify
3184 } else if (match_option(option, "-Xverify", &tail)) {
3185 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3186 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 } else if (strcmp(tail, ":remote") == 0) {
3193 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3197 return JNI_EINVAL;
3198 }
3199 } else if (strcmp(tail, ":none") == 0) {
3200 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3207 return JNI_EINVAL;
3208 }
3209 // -Xdebug
3210 } else if (match_option(option, "-Xdebug")) {
3211 // note this flag has been used, then ignore
3212 set_xdebug_mode(true);
3213 // -Xnoagent
3214 } else if (match_option(option, "-Xnoagent")) {
3215 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3216 } else if (match_option(option, "-Xloggc:", &tail)) {
3217 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3218 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3219 _gc_log_filename = os::strdup_check_oom(tail);
3220 } else if (match_option(option, "-Xlog", &tail)) {
3221 bool ret = false;
3222 if (strcmp(tail, ":help") == 0) {
3223 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3224 vm_exit(0);
3225 } else if (strcmp(tail, ":disable") == 0) {
3226 LogConfiguration::disable_logging();
3227 ret = true;
3228 } else if (*tail == '\0') {
3229 ret = LogConfiguration::parse_command_line_arguments();
3230 assert(ret, "-Xlog without arguments should never fail to parse");
3231 } else if (*tail == ':') {
3232 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3233 }
3234 if (ret == false) {
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Invalid -Xlog option '-Xlog%s'\n",
3237 tail);
3238 return JNI_EINVAL;
3239 }
3240 // JNI hooks
3241 } else if (match_option(option, "-Xcheck", &tail)) {
3242 if (!strcmp(tail, ":jni")) {
3243 #if !INCLUDE_JNI_CHECK
3244 warning("JNI CHECKING is not supported in this VM");
3245 #else
3246 CheckJNICalls = true;
3247 #endif // INCLUDE_JNI_CHECK
3248 } else if (is_bad_option(option, args->ignoreUnrecognized,
3249 "check")) {
3250 return JNI_EINVAL;
3251 }
3252 } else if (match_option(option, "vfprintf")) {
3253 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3254 } else if (match_option(option, "exit")) {
3255 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3256 } else if (match_option(option, "abort")) {
3257 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3258 // -XX:+AggressiveHeap
3259 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3260 jint result = set_aggressive_heap_flags();
3261 if (result != JNI_OK) {
3262 return result;
3263 }
3264 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3265 // and the last option wins.
3266 } else if (match_option(option, "-XX:+NeverTenure")) {
3267 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3271 return JNI_EINVAL;
3272 }
3273 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3277 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3278 return JNI_EINVAL;
3279 }
3280 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3281 return JNI_EINVAL;
3282 }
3283 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3287 uintx max_tenuring_thresh = 0;
3288 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3289 jio_fprintf(defaultStream::error_stream(),
3290 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3291 return JNI_EINVAL;
3292 }
3293
3294 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297
3298 if (MaxTenuringThreshold == 0) {
3299 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3300 return JNI_EINVAL;
3301 }
3302 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3303 return JNI_EINVAL;
3304 }
3305 } else {
3306 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3310 return JNI_EINVAL;
3311 }
3312 }
3313 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3314 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3315 return JNI_EINVAL;
3316 }
3317 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3321 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3322 return JNI_EINVAL;
3323 }
3324 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3325 return JNI_EINVAL;
3326 }
3327 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3328 #if defined(DTRACE_ENABLED)
3329 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3330 return JNI_EINVAL;
3331 }
3332 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3336 return JNI_EINVAL;
3337 }
3338 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 #else // defined(DTRACE_ENABLED)
3342 jio_fprintf(defaultStream::error_stream(),
3343 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3344 return JNI_EINVAL;
3345 #endif // defined(DTRACE_ENABLED)
3346 #ifdef ASSERT
3347 } else if (match_option(option, "-XX:+FullGCALot")) {
3348 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3349 return JNI_EINVAL;
3350 }
3351 // disable scavenge before parallel mark-compact
3352 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 #endif
3356 #if !INCLUDE_MANAGEMENT
3357 } else if (match_option(option, "-XX:+ManagementServer")) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "ManagementServer is not supported in this VM.\n");
3360 return JNI_ERR;
3361 #endif // INCLUDE_MANAGEMENT
3362 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3363 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3364 // already been handled
3365 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3366 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3367 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3368 return JNI_EINVAL;
3369 }
3370 }
3371 // Unknown option
3372 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3373 return JNI_ERR;
3374 }
3375 }
3376
3377 // PrintSharedArchiveAndExit will turn on
3378 // -Xshare:on
3379 // -Xlog:class+path=info
3380 if (PrintSharedArchiveAndExit) {
3381 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3382 return JNI_EINVAL;
3383 }
3384 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3385 return JNI_EINVAL;
3386 }
3387 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3388 }
3389
3390 // Change the default value for flags which have different default values
3391 // when working with older JDKs.
3392 #ifdef LINUX
3393 if (JDK_Version::current().compare_major(6) <= 0 &&
3394 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3395 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3396 }
3397 #endif // LINUX
3398 fix_appclasspath();
3399 return JNI_OK;
3400 }
3401
3402 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3403 // For java.base check for duplicate --patch-module options being specified on the command line.
3404 // This check is only required for java.base, all other duplicate module specifications
3405 // will be checked during module system initialization. The module system initialization
3406 // will throw an ExceptionInInitializerError if this situation occurs.
3407 if (strcmp(module_name, "java.base") == 0) {
3408 if (*patch_mod_javabase) {
3409 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3410 } else {
3411 *patch_mod_javabase = true;
3412 }
3413 }
3414
3415 // Create GrowableArray lazily, only if --patch-module has been specified
3416 if (_patch_mod_prefix == NULL) {
3417 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3418 }
3419
3420 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3421 }
3422
3423 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3424 // that follows either the jimage file or exploded module directories. The
3425 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3426 void Arguments::set_jdkbootclasspath_append() {
3427 char *sysclasspath = get_sysclasspath();
3428 assert(sysclasspath != NULL, "NULL sysclasspath");
3429 int bcp_a_idx = bootclassloader_append_index();
3430 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3431 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3432 }
3433 }
3434
3435 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3436 //
3437 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3438 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3439 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3440 // path is treated as the current directory.
3441 //
3442 // This causes problems with CDS, which requires that all directories specified in the classpath
3443 // must be empty. In most cases, applications do NOT want to load classes from the current
3444 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3445 // scripts compatible with CDS.
3446 void Arguments::fix_appclasspath() {
3447 if (IgnoreEmptyClassPaths) {
3448 const char separator = *os::path_separator();
3449 const char* src = _java_class_path->value();
3450
3451 // skip over all the leading empty paths
3452 while (*src == separator) {
3453 src ++;
3454 }
3455
3456 char* copy = os::strdup_check_oom(src, mtArguments);
3457
3458 // trim all trailing empty paths
3459 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3460 *tail = '\0';
3461 }
3462
3463 char from[3] = {separator, separator, '\0'};
3464 char to [2] = {separator, '\0'};
3465 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3466 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3467 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3468 }
3469
3470 _java_class_path->set_writeable_value(copy);
3471 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3472 }
3473 }
3474
3475 static bool has_jar_files(const char* directory) {
3476 DIR* dir = os::opendir(directory);
3477 if (dir == NULL) return false;
3478
3479 struct dirent *entry;
3480 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3481 bool hasJarFile = false;
3482 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3483 const char* name = entry->d_name;
3484 const char* ext = name + strlen(name) - 4;
3485 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3486 }
3487 FREE_C_HEAP_ARRAY(char, dbuf);
3488 os::closedir(dir);
3489 return hasJarFile ;
3490 }
3491
3492 static int check_non_empty_dirs(const char* path) {
3493 const char separator = *os::path_separator();
3494 const char* const end = path + strlen(path);
3495 int nonEmptyDirs = 0;
3496 while (path < end) {
3497 const char* tmp_end = strchr(path, separator);
3498 if (tmp_end == NULL) {
3499 if (has_jar_files(path)) {
3500 nonEmptyDirs++;
3501 jio_fprintf(defaultStream::output_stream(),
3502 "Non-empty directory: %s\n", path);
3503 }
3504 path = end;
3505 } else {
3506 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3507 memcpy(dirpath, path, tmp_end - path);
3508 dirpath[tmp_end - path] = '\0';
3509 if (has_jar_files(dirpath)) {
3510 nonEmptyDirs++;
3511 jio_fprintf(defaultStream::output_stream(),
3512 "Non-empty directory: %s\n", dirpath);
3513 }
3514 FREE_C_HEAP_ARRAY(char, dirpath);
3515 path = tmp_end + 1;
3516 }
3517 }
3518 return nonEmptyDirs;
3519 }
3520
3521 jint Arguments::finalize_vm_init_args() {
3522 // check if the default lib/endorsed directory exists; if so, error
3523 char path[JVM_MAXPATHLEN];
3524 const char* fileSep = os::file_separator();
3525 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3526
3527 if (CheckEndorsedAndExtDirs) {
3528 int nonEmptyDirs = 0;
3529 // check endorsed directory
3530 nonEmptyDirs += check_non_empty_dirs(path);
3531 // check the extension directories
3532 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3533 if (nonEmptyDirs > 0) {
3534 return JNI_ERR;
3535 }
3536 }
3537
3538 DIR* dir = os::opendir(path);
3539 if (dir != NULL) {
3540 jio_fprintf(defaultStream::output_stream(),
3541 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3542 "in modular form will be supported via the concept of upgradeable modules.\n");
3543 os::closedir(dir);
3544 return JNI_ERR;
3545 }
3546
3547 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3548 dir = os::opendir(path);
3549 if (dir != NULL) {
3550 jio_fprintf(defaultStream::output_stream(),
3551 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3552 "Use -classpath instead.\n.");
3553 os::closedir(dir);
3554 return JNI_ERR;
3555 }
3556
3557 // Append the value of the last --add-modules option specified on the command line.
3558 // This needs to be done here, to prevent overwriting possible values written
3559 // to the jdk.module.addmods property by -javaagent and other options.
3560 if (add_modules_value != NULL) {
3561 if (!append_to_addmods_property(add_modules_value)) {
3562 return JNI_ENOMEM;
3563 }
3564 }
3565
3566 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3567
3568 // This must be done after all arguments have been processed.
3569 // java_compiler() true means set to "NONE" or empty.
3570 if (java_compiler() && !xdebug_mode()) {
3571 // For backwards compatibility, we switch to interpreted mode if
3572 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3573 // not specified.
3574 set_mode_flags(_int);
3575 }
3576
3577 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3578 // but like -Xint, leave compilation thresholds unaffected.
3579 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3580 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3581 set_mode_flags(_int);
3582 }
3583
3584 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3585 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3586 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3587 }
3588
3589 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3590 // Don't degrade server performance for footprint
3591 if (FLAG_IS_DEFAULT(UseLargePages) &&
3592 MaxHeapSize < LargePageHeapSizeThreshold) {
3593 // No need for large granularity pages w/small heaps.
3594 // Note that large pages are enabled/disabled for both the
3595 // Java heap and the code cache.
3596 FLAG_SET_DEFAULT(UseLargePages, false);
3597 }
3598
3599 #elif defined(COMPILER2)
3600 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3601 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3602 }
3603 #endif
3604
3605 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3606 UNSUPPORTED_OPTION(ProfileInterpreter);
3607 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3608 #endif
3609
3610 #ifndef TIERED
3611 // Tiered compilation is undefined.
3612 UNSUPPORTED_OPTION(TieredCompilation);
3613 #endif
3614
3615 #if INCLUDE_JVMCI
3616 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3617 return JNI_ENOMEM;
3618 }
3619 #endif
3620
3621 // If we are running in a headless jre, force java.awt.headless property
3622 // to be true unless the property has already been set.
3623 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3624 if (os::is_headless_jre()) {
3625 const char* headless = Arguments::get_property("java.awt.headless");
3626 if (headless == NULL) {
3627 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3628 if (headless_env == NULL) {
3629 if (!add_property("java.awt.headless=true")) {
3630 return JNI_ENOMEM;
3631 }
3632 } else {
3633 char buffer[256];
3634 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3635 if (!add_property(buffer)) {
3636 return JNI_ENOMEM;
3637 }
3638 }
3639 }
3640 }
3641
3642 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3643 // CMS can only be used with ParNew
3644 FLAG_SET_ERGO(bool, UseParNewGC, true);
3645 }
3646
3647 if (!check_vm_args_consistency()) {
3648 return JNI_ERR;
3649 }
3650
3651 return JNI_OK;
3652 }
3653
3654 // Helper class for controlling the lifetime of JavaVMInitArgs
3655 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3656 // deleted on the destruction of the ScopedVMInitArgs object.
3657 class ScopedVMInitArgs : public StackObj {
3658 private:
3659 JavaVMInitArgs _args;
3660 char* _container_name;
3661 bool _is_set;
3662 char* _vm_options_file_arg;
3663
3664 public:
3665 ScopedVMInitArgs(const char *container_name) {
3666 _args.version = JNI_VERSION_1_2;
3667 _args.nOptions = 0;
3668 _args.options = NULL;
3669 _args.ignoreUnrecognized = false;
3670 _container_name = (char *)container_name;
3671 _is_set = false;
3672 _vm_options_file_arg = NULL;
3673 }
3674
3675 // Populates the JavaVMInitArgs object represented by this
3676 // ScopedVMInitArgs object with the arguments in options. The
3677 // allocated memory is deleted by the destructor. If this method
3678 // returns anything other than JNI_OK, then this object is in a
3679 // partially constructed state, and should be abandoned.
3680 jint set_args(GrowableArray<JavaVMOption>* options) {
3681 _is_set = true;
3682 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3683 JavaVMOption, options->length(), mtArguments);
3684 if (options_arr == NULL) {
3685 return JNI_ENOMEM;
3686 }
3687 _args.options = options_arr;
3688
3689 for (int i = 0; i < options->length(); i++) {
3690 options_arr[i] = options->at(i);
3691 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3692 if (options_arr[i].optionString == NULL) {
3693 // Rely on the destructor to do cleanup.
3694 _args.nOptions = i;
3695 return JNI_ENOMEM;
3696 }
3697 }
3698
3699 _args.nOptions = options->length();
3700 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3701 return JNI_OK;
3702 }
3703
3704 JavaVMInitArgs* get() { return &_args; }
3705 char* container_name() { return _container_name; }
3706 bool is_set() { return _is_set; }
3707 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3708 char* vm_options_file_arg() { return _vm_options_file_arg; }
3709
3710 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3711 if (_vm_options_file_arg != NULL) {
3712 os::free(_vm_options_file_arg);
3713 }
3714 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3715 }
3716
3717 ~ScopedVMInitArgs() {
3718 if (_vm_options_file_arg != NULL) {
3719 os::free(_vm_options_file_arg);
3720 }
3721 if (_args.options == NULL) return;
3722 for (int i = 0; i < _args.nOptions; i++) {
3723 os::free(_args.options[i].optionString);
3724 }
3725 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3726 }
3727
3728 // Insert options into this option list, to replace option at
3729 // vm_options_file_pos (-XX:VMOptionsFile)
3730 jint insert(const JavaVMInitArgs* args,
3731 const JavaVMInitArgs* args_to_insert,
3732 const int vm_options_file_pos) {
3733 assert(_args.options == NULL, "shouldn't be set yet");
3734 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3735 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3736
3737 int length = args->nOptions + args_to_insert->nOptions - 1;
3738 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3739 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3740 for (int i = 0; i < args->nOptions; i++) {
3741 if (i == vm_options_file_pos) {
3742 // insert the new options starting at the same place as the
3743 // -XX:VMOptionsFile option
3744 for (int j = 0; j < args_to_insert->nOptions; j++) {
3745 options->push(args_to_insert->options[j]);
3746 }
3747 } else {
3748 options->push(args->options[i]);
3749 }
3750 }
3751 // make into options array
3752 jint result = set_args(options);
3753 delete options;
3754 return result;
3755 }
3756 };
3757
3758 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3759 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3760 }
3761
3762 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3763 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3764 }
3765
3766 jint Arguments::parse_options_environment_variable(const char* name,
3767 ScopedVMInitArgs* vm_args) {
3768 char *buffer = ::getenv(name);
3769
3770 // Don't check this environment variable if user has special privileges
3771 // (e.g. unix su command).
3772 if (buffer == NULL || os::have_special_privileges()) {
3773 return JNI_OK;
3774 }
3775
3776 if ((buffer = os::strdup(buffer)) == NULL) {
3777 return JNI_ENOMEM;
3778 }
3779
3780 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3781
3782 os::free(buffer);
3783 return retcode;
3784 }
3785
3786 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3787 // read file into buffer
3788 int fd = ::open(file_name, O_RDONLY);
3789 if (fd < 0) {
3790 jio_fprintf(defaultStream::error_stream(),
3791 "Could not open options file '%s'\n",
3792 file_name);
3793 return JNI_ERR;
3794 }
3795
3796 struct stat stbuf;
3797 int retcode = os::stat(file_name, &stbuf);
3798 if (retcode != 0) {
3799 jio_fprintf(defaultStream::error_stream(),
3800 "Could not stat options file '%s'\n",
3801 file_name);
3802 os::close(fd);
3803 return JNI_ERR;
3804 }
3805
3806 if (stbuf.st_size == 0) {
3807 // tell caller there is no option data and that is ok
3808 os::close(fd);
3809 return JNI_OK;
3810 }
3811
3812 // '+ 1' for NULL termination even with max bytes
3813 size_t bytes_alloc = stbuf.st_size + 1;
3814
3815 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3816 if (NULL == buf) {
3817 jio_fprintf(defaultStream::error_stream(),
3818 "Could not allocate read buffer for options file parse\n");
3819 os::close(fd);
3820 return JNI_ENOMEM;
3821 }
3822
3823 memset(buf, 0, bytes_alloc);
3824
3825 // Fill buffer
3826 // Use ::read() instead of os::read because os::read()
3827 // might do a thread state transition
3828 // and it is too early for that here
3829
3830 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3831 os::close(fd);
3832 if (bytes_read < 0) {
3833 FREE_C_HEAP_ARRAY(char, buf);
3834 jio_fprintf(defaultStream::error_stream(),
3835 "Could not read options file '%s'\n", file_name);
3836 return JNI_ERR;
3837 }
3838
3839 if (bytes_read == 0) {
3840 // tell caller there is no option data and that is ok
3841 FREE_C_HEAP_ARRAY(char, buf);
3842 return JNI_OK;
3843 }
3844
3845 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3846
3847 FREE_C_HEAP_ARRAY(char, buf);
3848 return retcode;
3849 }
3850
3851 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3852 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3853
3854 // some pointers to help with parsing
3855 char *buffer_end = buffer + buf_len;
3856 char *opt_hd = buffer;
3857 char *wrt = buffer;
3858 char *rd = buffer;
3859
3860 // parse all options
3861 while (rd < buffer_end) {
3862 // skip leading white space from the input string
3863 while (rd < buffer_end && isspace(*rd)) {
3864 rd++;
3865 }
3866
3867 if (rd >= buffer_end) {
3868 break;
3869 }
3870
3871 // Remember this is where we found the head of the token.
3872 opt_hd = wrt;
3873
3874 // Tokens are strings of non white space characters separated
3875 // by one or more white spaces.
3876 while (rd < buffer_end && !isspace(*rd)) {
3877 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3878 int quote = *rd; // matching quote to look for
3879 rd++; // don't copy open quote
3880 while (rd < buffer_end && *rd != quote) {
3881 // include everything (even spaces)
3882 // up until the close quote
3883 *wrt++ = *rd++; // copy to option string
3884 }
3885
3886 if (rd < buffer_end) {
3887 rd++; // don't copy close quote
3888 } else {
3889 // did not see closing quote
3890 jio_fprintf(defaultStream::error_stream(),
3891 "Unmatched quote in %s\n", name);
3892 delete options;
3893 return JNI_ERR;
3894 }
3895 } else {
3896 *wrt++ = *rd++; // copy to option string
3897 }
3898 }
3899
3900 // steal a white space character and set it to NULL
3901 *wrt++ = '\0';
3902 // We now have a complete token
3903
3904 JavaVMOption option;
3905 option.optionString = opt_hd;
3906 option.extraInfo = NULL;
3907
3908 options->append(option); // Fill in option
3909
3910 rd++; // Advance to next character
3911 }
3912
3913 // Fill out JavaVMInitArgs structure.
3914 jint status = vm_args->set_args(options);
3915
3916 delete options;
3917 return status;
3918 }
3919
3920 void Arguments::set_shared_spaces_flags() {
3921 if (DumpSharedSpaces) {
3922 if (Arguments::get_patch_mod_prefix() != NULL) {
3923 vm_exit_during_initialization(
3924 "Cannot use the following option when dumping the shared archive: --patch-module");
3925 }
3926
3927 if (RequireSharedSpaces) {
3928 warning("Cannot dump shared archive while using shared archive");
3929 }
3930 UseSharedSpaces = false;
3931 #ifdef _LP64
3932 if (!UseCompressedOops || !UseCompressedClassPointers) {
3933 vm_exit_during_initialization(
3934 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3935 }
3936 } else {
3937 if (!UseCompressedOops || !UseCompressedClassPointers) {
3938 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3939 }
3940 #endif
3941 }
3942 }
3943
3944 // Sharing support
3945 // Construct the path to the archive
3946 static char* get_shared_archive_path() {
3947 char *shared_archive_path;
3948 if (SharedArchiveFile == NULL) {
3949 char jvm_path[JVM_MAXPATHLEN];
3950 os::jvm_path(jvm_path, sizeof(jvm_path));
3951 char *end = strrchr(jvm_path, *os::file_separator());
3952 if (end != NULL) *end = '\0';
3953 size_t jvm_path_len = strlen(jvm_path);
3954 size_t file_sep_len = strlen(os::file_separator());
3955 const size_t len = jvm_path_len + file_sep_len + 20;
3956 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3957 if (shared_archive_path != NULL) {
3958 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3959 jvm_path, os::file_separator());
3960 }
3961 } else {
3962 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3963 }
3964 return shared_archive_path;
3965 }
3966
3967 #ifndef PRODUCT
3968 // Determine whether LogVMOutput should be implicitly turned on.
3969 static bool use_vm_log() {
3970 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3971 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3972 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3973 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3974 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3975 return true;
3976 }
3977
3978 #ifdef COMPILER1
3979 if (PrintC1Statistics) {
3980 return true;
3981 }
3982 #endif // COMPILER1
3983
3984 #ifdef COMPILER2
3985 if (PrintOptoAssembly || PrintOptoStatistics) {
3986 return true;
3987 }
3988 #endif // COMPILER2
3989
3990 return false;
3991 }
3992
3993 #endif // PRODUCT
3994
3995 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3996 for (int index = 0; index < args->nOptions; index++) {
3997 const JavaVMOption* option = args->options + index;
3998 const char* tail;
3999 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4000 return true;
4001 }
4002 }
4003 return false;
4004 }
4005
4006 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4007 const char* vm_options_file,
4008 const int vm_options_file_pos,
4009 ScopedVMInitArgs* vm_options_file_args,
4010 ScopedVMInitArgs* args_out) {
4011 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4012 if (code != JNI_OK) {
4013 return code;
4014 }
4015
4016 if (vm_options_file_args->get()->nOptions < 1) {
4017 return JNI_OK;
4018 }
4019
4020 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4021 jio_fprintf(defaultStream::error_stream(),
4022 "A VM options file may not refer to a VM options file. "
4023 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4024 "options file '%s' in options container '%s' is an error.\n",
4025 vm_options_file_args->vm_options_file_arg(),
4026 vm_options_file_args->container_name());
4027 return JNI_EINVAL;
4028 }
4029
4030 return args_out->insert(args, vm_options_file_args->get(),
4031 vm_options_file_pos);
4032 }
4033
4034 // Expand -XX:VMOptionsFile found in args_in as needed.
4035 // mod_args and args_out parameters may return values as needed.
4036 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4037 ScopedVMInitArgs* mod_args,
4038 JavaVMInitArgs** args_out) {
4039 jint code = match_special_option_and_act(args_in, mod_args);
4040 if (code != JNI_OK) {
4041 return code;
4042 }
4043
4044 if (mod_args->is_set()) {
4045 // args_in contains -XX:VMOptionsFile and mod_args contains the
4046 // original options from args_in along with the options expanded
4047 // from the VMOptionsFile. Return a short-hand to the caller.
4048 *args_out = mod_args->get();
4049 } else {
4050 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4051 }
4052 return JNI_OK;
4053 }
4054
4055 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4056 ScopedVMInitArgs* args_out) {
4057 // Remaining part of option string
4058 const char* tail;
4059 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4060
4061 for (int index = 0; index < args->nOptions; index++) {
4062 const JavaVMOption* option = args->options + index;
4063 if (ArgumentsExt::process_options(option)) {
4064 continue;
4065 }
4066 if (match_option(option, "-XX:Flags=", &tail)) {
4067 Arguments::set_jvm_flags_file(tail);
4068 continue;
4069 }
4070 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4071 if (vm_options_file_args.found_vm_options_file_arg()) {
4072 jio_fprintf(defaultStream::error_stream(),
4073 "The option '%s' is already specified in the options "
4074 "container '%s' so the specification of '%s' in the "
4075 "same options container is an error.\n",
4076 vm_options_file_args.vm_options_file_arg(),
4077 vm_options_file_args.container_name(),
4078 option->optionString);
4079 return JNI_EINVAL;
4080 }
4081 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4082 // If there's a VMOptionsFile, parse that
4083 jint code = insert_vm_options_file(args, tail, index,
4084 &vm_options_file_args, args_out);
4085 if (code != JNI_OK) {
4086 return code;
4087 }
4088 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4089 if (args_out->is_set()) {
4090 // The VMOptions file inserted some options so switch 'args'
4091 // to the new set of options, and continue processing which
4092 // preserves "last option wins" semantics.
4093 args = args_out->get();
4094 // The first option from the VMOptionsFile replaces the
4095 // current option. So we back track to process the
4096 // replacement option.
4097 index--;
4098 }
4099 continue;
4100 }
4101 if (match_option(option, "-XX:+PrintVMOptions")) {
4102 PrintVMOptions = true;
4103 continue;
4104 }
4105 if (match_option(option, "-XX:-PrintVMOptions")) {
4106 PrintVMOptions = false;
4107 continue;
4108 }
4109 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4110 IgnoreUnrecognizedVMOptions = true;
4111 continue;
4112 }
4113 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4114 IgnoreUnrecognizedVMOptions = false;
4115 continue;
4116 }
4117 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4118 CommandLineFlags::printFlags(tty, false);
4119 vm_exit(0);
4120 }
4121 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4122 #if INCLUDE_NMT
4123 // The launcher did not setup nmt environment variable properly.
4124 if (!MemTracker::check_launcher_nmt_support(tail)) {
4125 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4126 }
4127
4128 // Verify if nmt option is valid.
4129 if (MemTracker::verify_nmt_option()) {
4130 // Late initialization, still in single-threaded mode.
4131 if (MemTracker::tracking_level() >= NMT_summary) {
4132 MemTracker::init();
4133 }
4134 } else {
4135 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4136 }
4137 continue;
4138 #else
4139 jio_fprintf(defaultStream::error_stream(),
4140 "Native Memory Tracking is not supported in this VM\n");
4141 return JNI_ERR;
4142 #endif
4143 }
4144
4145 #ifndef PRODUCT
4146 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4147 CommandLineFlags::printFlags(tty, true);
4148 vm_exit(0);
4149 }
4150 #endif
4151 }
4152 return JNI_OK;
4153 }
4154
4155 static void print_options(const JavaVMInitArgs *args) {
4156 const char* tail;
4157 for (int index = 0; index < args->nOptions; index++) {
4158 const JavaVMOption *option = args->options + index;
4159 if (match_option(option, "-XX:", &tail)) {
4160 logOption(tail);
4161 }
4162 }
4163 }
4164
4165 bool Arguments::handle_deprecated_print_gc_flags() {
4166 if (PrintGC) {
4167 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4168 }
4169 if (PrintGCDetails) {
4170 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4171 }
4172
4173 if (_gc_log_filename != NULL) {
4174 // -Xloggc was used to specify a filename
4175 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4176 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4177 } else if (PrintGC || PrintGCDetails) {
4178 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4179 }
4180 return true;
4181 }
4182
4183 // Parse entry point called from JNI_CreateJavaVM
4184
4185 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4186 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4187
4188 // Initialize ranges, constraints and writeables
4189 CommandLineFlagRangeList::init();
4190 CommandLineFlagConstraintList::init();
4191 CommandLineFlagWriteableList::init();
4192
4193 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4194 const char* hotspotrc = ".hotspotrc";
4195 bool settings_file_specified = false;
4196 bool needs_hotspotrc_warning = false;
4197 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4198 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4199
4200 // Pointers to current working set of containers
4201 JavaVMInitArgs* cur_cmd_args;
4202 JavaVMInitArgs* cur_java_options_args;
4203 JavaVMInitArgs* cur_java_tool_options_args;
4204
4205 // Containers for modified/expanded options
4206 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4207 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4208 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4209
4210
4211 jint code =
4212 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4213 if (code != JNI_OK) {
4214 return code;
4215 }
4216
4217 code = parse_java_options_environment_variable(&initial_java_options_args);
4218 if (code != JNI_OK) {
4219 return code;
4220 }
4221
4222 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4223 &mod_java_tool_options_args,
4224 &cur_java_tool_options_args);
4225 if (code != JNI_OK) {
4226 return code;
4227 }
4228
4229 code = expand_vm_options_as_needed(initial_cmd_args,
4230 &mod_cmd_args,
4231 &cur_cmd_args);
4232 if (code != JNI_OK) {
4233 return code;
4234 }
4235
4236 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4237 &mod_java_options_args,
4238 &cur_java_options_args);
4239 if (code != JNI_OK) {
4240 return code;
4241 }
4242
4243 const char* flags_file = Arguments::get_jvm_flags_file();
4244 settings_file_specified = (flags_file != NULL);
4245
4246 if (IgnoreUnrecognizedVMOptions) {
4247 cur_cmd_args->ignoreUnrecognized = true;
4248 cur_java_tool_options_args->ignoreUnrecognized = true;
4249 cur_java_options_args->ignoreUnrecognized = true;
4250 }
4251
4252 // Parse specified settings file
4253 if (settings_file_specified) {
4254 if (!process_settings_file(flags_file, true,
4255 cur_cmd_args->ignoreUnrecognized)) {
4256 return JNI_EINVAL;
4257 }
4258 } else {
4259 #ifdef ASSERT
4260 // Parse default .hotspotrc settings file
4261 if (!process_settings_file(".hotspotrc", false,
4262 cur_cmd_args->ignoreUnrecognized)) {
4263 return JNI_EINVAL;
4264 }
4265 #else
4266 struct stat buf;
4267 if (os::stat(hotspotrc, &buf) == 0) {
4268 needs_hotspotrc_warning = true;
4269 }
4270 #endif
4271 }
4272
4273 if (PrintVMOptions) {
4274 print_options(cur_java_tool_options_args);
4275 print_options(cur_cmd_args);
4276 print_options(cur_java_options_args);
4277 }
4278
4279 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4280 jint result = parse_vm_init_args(cur_java_tool_options_args,
4281 cur_java_options_args,
4282 cur_cmd_args);
4283
4284 if (result != JNI_OK) {
4285 return result;
4286 }
4287
4288 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4289 SharedArchivePath = get_shared_archive_path();
4290 if (SharedArchivePath == NULL) {
4291 return JNI_ENOMEM;
4292 }
4293
4294 // Set up VerifySharedSpaces
4295 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4296 VerifySharedSpaces = true;
4297 }
4298
4299 // Delay warning until here so that we've had a chance to process
4300 // the -XX:-PrintWarnings flag
4301 if (needs_hotspotrc_warning) {
4302 warning("%s file is present but has been ignored. "
4303 "Run with -XX:Flags=%s to load the file.",
4304 hotspotrc, hotspotrc);
4305 }
4306
4307 if (needs_module_property_warning) {
4308 warning("Ignoring system property options whose names start with '-Djdk.module'."
4309 " They are reserved for internal use.");
4310 }
4311
4312 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4313 UNSUPPORTED_OPTION(UseLargePages);
4314 #endif
4315
4316 ArgumentsExt::report_unsupported_options();
4317
4318 #ifndef PRODUCT
4319 if (TraceBytecodesAt != 0) {
4320 TraceBytecodes = true;
4321 }
4322 if (CountCompiledCalls) {
4323 if (UseCounterDecay) {
4324 warning("UseCounterDecay disabled because CountCalls is set");
4325 UseCounterDecay = false;
4326 }
4327 }
4328 #endif // PRODUCT
4329
4330 if (ScavengeRootsInCode == 0) {
4331 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4332 warning("Forcing ScavengeRootsInCode non-zero");
4333 }
4334 ScavengeRootsInCode = 1;
4335 }
4336
4337 if (!handle_deprecated_print_gc_flags()) {
4338 return JNI_EINVAL;
4339 }
4340
4341 // Set object alignment values.
4342 set_object_alignment();
4343
4344 #if !INCLUDE_CDS
4345 if (DumpSharedSpaces || RequireSharedSpaces) {
4346 jio_fprintf(defaultStream::error_stream(),
4347 "Shared spaces are not supported in this VM\n");
4348 return JNI_ERR;
4349 }
4350 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4351 warning("Shared spaces are not supported in this VM");
4352 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4353 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4354 }
4355 no_shared_spaces("CDS Disabled");
4356 #endif // INCLUDE_CDS
4357
4358 return JNI_OK;
4359 }
4360
4361 jint Arguments::apply_ergo() {
4362
4363 // Set flags based on ergonomics.
4364 set_ergonomics_flags();
4365
4366 set_shared_spaces_flags();
4367
4368 // Check the GC selections again.
4369 if (!check_gc_consistency()) {
4370 return JNI_EINVAL;
4371 }
4372
4373 if (TieredCompilation) {
4374 set_tiered_flags();
4375 } else {
4376 int max_compilation_policy_choice = 1;
4377 #ifdef COMPILER2
4378 max_compilation_policy_choice = 2;
4379 #endif
4380 // Check if the policy is valid.
4381 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4382 vm_exit_during_initialization(
4383 "Incompatible compilation policy selected", NULL);
4384 }
4385 // Scale CompileThreshold
4386 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4387 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4388 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4389 }
4390 }
4391
4392 #ifdef COMPILER2
4393 #ifndef PRODUCT
4394 if (PrintIdealGraphLevel > 0) {
4395 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4396 }
4397 #endif
4398 #endif
4399
4400 // Set heap size based on available physical memory
4401 set_heap_size();
4402
4403 ArgumentsExt::set_gc_specific_flags();
4404
4405 // Initialize Metaspace flags and alignments
4406 Metaspace::ergo_initialize();
4407
4408 // Set bytecode rewriting flags
4409 set_bytecode_flags();
4410
4411 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4412 jint code = set_aggressive_opts_flags();
4413 if (code != JNI_OK) {
4414 return code;
4415 }
4416
4417 // Turn off biased locking for locking debug mode flags,
4418 // which are subtly different from each other but neither works with
4419 // biased locking
4420 if (UseHeavyMonitors
4421 #ifdef COMPILER1
4422 || !UseFastLocking
4423 #endif // COMPILER1
4424 #if INCLUDE_JVMCI
4425 || !JVMCIUseFastLocking
4426 #endif
4427 ) {
4428 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4429 // flag set to true on command line; warn the user that they
4430 // can't enable biased locking here
4431 warning("Biased Locking is not supported with locking debug flags"
4432 "; ignoring UseBiasedLocking flag." );
4433 }
4434 UseBiasedLocking = false;
4435 }
4436
4437 #ifdef CC_INTERP
4438 // Clear flags not supported on zero.
4439 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4440 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4441 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4442 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4443 #endif // CC_INTERP
4444
4445 #ifdef COMPILER2
4446 if (!EliminateLocks) {
4447 EliminateNestedLocks = false;
4448 }
4449 if (!Inline) {
4450 IncrementalInline = false;
4451 }
4452 #ifndef PRODUCT
4453 if (!IncrementalInline) {
4454 AlwaysIncrementalInline = false;
4455 }
4456 #endif
4457 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4458 // nothing to use the profiling, turn if off
4459 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4460 }
4461 #endif
4462
4463 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4464 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4465 DebugNonSafepoints = true;
4466 }
4467
4468 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4469 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4470 }
4471
4472 if (UseOnStackReplacement && !UseLoopCounter) {
4473 warning("On-stack-replacement requires loop counters; enabling loop counters");
4474 FLAG_SET_DEFAULT(UseLoopCounter, true);
4475 }
4476
4477 #ifndef PRODUCT
4478 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4479 if (use_vm_log()) {
4480 LogVMOutput = true;
4481 }
4482 }
4483 #endif // PRODUCT
4484
4485 if (PrintCommandLineFlags) {
4486 CommandLineFlags::printSetFlags(tty);
4487 }
4488
4489 // Apply CPU specific policy for the BiasedLocking
4490 if (UseBiasedLocking) {
4491 if (!VM_Version::use_biased_locking() &&
4492 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4493 UseBiasedLocking = false;
4494 }
4495 }
4496 #ifdef COMPILER2
4497 if (!UseBiasedLocking || EmitSync != 0) {
4498 UseOptoBiasInlining = false;
4499 }
4500 #endif
4501
4502 return JNI_OK;
4503 }
4504
4505 jint Arguments::adjust_after_os() {
4506 if (UseNUMA) {
4507 if (UseParallelGC || UseParallelOldGC) {
4508 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4509 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4510 }
4511 }
4512 // UseNUMAInterleaving is set to ON for all collectors and
4513 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4514 // such as the parallel collector for Linux and Solaris will
4515 // interleave old gen and survivor spaces on top of NUMA
4516 // allocation policy for the eden space.
4517 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4518 // all platforms and ParallelGC on Windows will interleave all
4519 // of the heap spaces across NUMA nodes.
4520 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4521 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4522 }
4523 }
4524 return JNI_OK;
4525 }
4526
4527 int Arguments::PropertyList_count(SystemProperty* pl) {
4528 int count = 0;
4529 while(pl != NULL) {
4530 count++;
4531 pl = pl->next();
4532 }
4533 return count;
4534 }
4535
4536 // Return the number of readable properties.
4537 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4538 int count = 0;
4539 while(pl != NULL) {
4540 if (pl->is_readable()) {
4541 count++;
4542 }
4543 pl = pl->next();
4544 }
4545 return count;
4546 }
4547
4548 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4549 assert(key != NULL, "just checking");
4550 SystemProperty* prop;
4551 for (prop = pl; prop != NULL; prop = prop->next()) {
4552 if (strcmp(key, prop->key()) == 0) return prop->value();
4553 }
4554 return NULL;
4555 }
4556
4557 // Return the value of the requested property provided that it is a readable property.
4558 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4559 assert(key != NULL, "just checking");
4560 SystemProperty* prop;
4561 // Return the property value if the keys match and the property is not internal or
4562 // it's the special internal property "jdk.boot.class.path.append".
4563 for (prop = pl; prop != NULL; prop = prop->next()) {
4564 if (strcmp(key, prop->key()) == 0) {
4565 if (!prop->internal()) {
4566 return prop->value();
4567 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4568 return prop->value();
4569 } else {
4570 // Property is internal and not jdk.boot.class.path.append so return NULL.
4571 return NULL;
4572 }
4573 }
4574 }
4575 return NULL;
4576 }
4577
4578 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4579 int count = 0;
4580 const char* ret_val = NULL;
4581
4582 while(pl != NULL) {
4583 if(count >= index) {
4584 ret_val = pl->key();
4585 break;
4586 }
4587 count++;
4588 pl = pl->next();
4589 }
4590
4591 return ret_val;
4592 }
4593
4594 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4595 int count = 0;
4596 char* ret_val = NULL;
4597
4598 while(pl != NULL) {
4599 if(count >= index) {
4600 ret_val = pl->value();
4601 break;
4602 }
4603 count++;
4604 pl = pl->next();
4605 }
4606
4607 return ret_val;
4608 }
4609
4610 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4611 SystemProperty* p = *plist;
4612 if (p == NULL) {
4613 *plist = new_p;
4614 } else {
4615 while (p->next() != NULL) {
4616 p = p->next();
4617 }
4618 p->set_next(new_p);
4619 }
4620 }
4621
4622 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4623 bool writeable, bool internal) {
4624 if (plist == NULL)
4625 return;
4626
4627 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4628 PropertyList_add(plist, new_p);
4629 }
4630
4631 void Arguments::PropertyList_add(SystemProperty *element) {
4632 PropertyList_add(&_system_properties, element);
4633 }
4634
4635 // This add maintains unique property key in the list.
4636 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4637 PropertyAppendable append, PropertyWriteable writeable,
4638 PropertyInternal internal) {
4639 if (plist == NULL)
4640 return;
4641
4642 // If property key exist then update with new value.
4643 SystemProperty* prop;
4644 for (prop = *plist; prop != NULL; prop = prop->next()) {
4645 if (strcmp(k, prop->key()) == 0) {
4646 if (append == AppendProperty) {
4647 prop->append_value(v);
4648 } else {
4649 prop->set_value(v);
4650 }
4651 return;
4652 }
4653 }
4654
4655 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4656 }
4657
4658 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4659 // Returns true if all of the source pointed by src has been copied over to
4660 // the destination buffer pointed by buf. Otherwise, returns false.
4661 // Notes:
4662 // 1. If the length (buflen) of the destination buffer excluding the
4663 // NULL terminator character is not long enough for holding the expanded
4664 // pid characters, it also returns false instead of returning the partially
4665 // expanded one.
4666 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4667 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4668 char* buf, size_t buflen) {
4669 const char* p = src;
4670 char* b = buf;
4671 const char* src_end = &src[srclen];
4672 char* buf_end = &buf[buflen - 1];
4673
4674 while (p < src_end && b < buf_end) {
4675 if (*p == '%') {
4676 switch (*(++p)) {
4677 case '%': // "%%" ==> "%"
4678 *b++ = *p++;
4679 break;
4680 case 'p': { // "%p" ==> current process id
4681 // buf_end points to the character before the last character so
4682 // that we could write '\0' to the end of the buffer.
4683 size_t buf_sz = buf_end - b + 1;
4684 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4685
4686 // if jio_snprintf fails or the buffer is not long enough to hold
4687 // the expanded pid, returns false.
4688 if (ret < 0 || ret >= (int)buf_sz) {
4689 return false;
4690 } else {
4691 b += ret;
4692 assert(*b == '\0', "fail in copy_expand_pid");
4693 if (p == src_end && b == buf_end + 1) {
4694 // reach the end of the buffer.
4695 return true;
4696 }
4697 }
4698 p++;
4699 break;
4700 }
4701 default :
4702 *b++ = '%';
4703 }
4704 } else {
4705 *b++ = *p++;
4706 }
4707 }
4708 *b = '\0';
4709 return (p == src_end); // return false if not all of the source was copied
4710 }