1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciRuntime.hpp"
60 #endif
61 #if INCLUDE_ALL_GCS
62 #include "gc/cms/compactibleFreeListSpace.hpp"
63 #include "gc/g1/g1CollectedHeap.inline.hpp"
64 #include "gc/parallel/parallelScavengeHeap.hpp"
65 #endif // INCLUDE_ALL_GCS
66
67 // Note: This is a special bug reporting site for the JVM
68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
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 bool Arguments::_has_jimage = false;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 bool needs_module_property_warning = false;
166
167 #define MODULE_PROPERTY_PREFIX "jdk.module."
168 #define MODULE_PROPERTY_PREFIX_LEN 11
169 #define ADDEXPORTS "addexports"
170 #define ADDEXPORTS_LEN 10
171 #define ADDREADS "addreads"
172 #define ADDREADS_LEN 8
173 #define PATCH "patch"
174 #define PATCH_LEN 5
175 #define ADDMODS "addmods"
176 #define ADDMODS_LEN 7
177 #define LIMITMODS "limitmods"
178 #define LIMITMODS_LEN 9
179 #define PATH "path"
180 #define PATH_LEN 4
181 #define UPGRADE_PATH "upgrade.path"
182 #define UPGRADE_PATH_LEN 12
183
184 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
185 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
186 return ((strncmp(option, property, len) == 0) &&
187 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
188 }
189
190 // Return true if property starts with "jdk.module." and its ensuing chars match
191 // any of the reserved module properties.
192 // property should be passed without the leading "-D".
193 bool Arguments::is_internal_module_property(const char* property) {
194 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
195 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
196 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
197 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
198 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
199 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
200 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
201 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
202 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
203 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
204 return true;
205 }
206 }
207 return false;
208 }
209
210 // Process java launcher properties.
211 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
212 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
213 // sun.java.launcher.pid is defined.
214 // Must do this before setting up other system properties,
215 // as some of them may depend on launcher type.
216 for (int index = 0; index < args->nOptions; index++) {
217 const JavaVMOption* option = args->options + index;
218 const char* tail;
219
220 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
221 process_java_launcher_argument(tail, option->extraInfo);
222 continue;
223 }
224 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
225 if (strcmp(tail, "true") == 0) {
226 _sun_java_launcher_is_altjvm = true;
227 }
228 continue;
229 }
230 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
231 _sun_java_launcher_pid = atoi(tail);
232 continue;
233 }
234 }
235 }
236
237 // Initialize system properties key and value.
238 void Arguments::init_system_properties() {
239
240 // Set up _system_boot_class_path which is not a property but
241 // relies heavily on argument processing and the jdk.boot.class.path.append
242 // property. It is used to store the underlying system boot class path.
243 _system_boot_class_path = new PathString(NULL);
244
245 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
246 "Java Virtual Machine Specification", false));
247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
250 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
251
252 // Following are JVMTI agent writable properties.
253 // Properties values are set to NULL and they are
254 // os specific they are initialized in os::init_system_properties_values().
255 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
256 _java_library_path = new SystemProperty("java.library.path", NULL, true);
257 _java_home = new SystemProperty("java.home", NULL, true);
258 _java_class_path = new SystemProperty("java.class.path", "", true);
259 // jdk.boot.class.path.append is a non-writeable, internal property.
260 // It can only be set by either:
261 // - -Xbootclasspath/a:
262 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
263 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
264
265 // Add to System Property list.
266 PropertyList_add(&_system_properties, _sun_boot_library_path);
267 PropertyList_add(&_system_properties, _java_library_path);
268 PropertyList_add(&_system_properties, _java_home);
269 PropertyList_add(&_system_properties, _java_class_path);
270 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
271
272 // Set OS specific system properties values
273 os::init_system_properties_values();
274 }
275
276 // Update/Initialize System properties after JDK version number is known
277 void Arguments::init_version_specific_system_properties() {
278 enum { bufsz = 16 };
279 char buffer[bufsz];
280 const char* spec_vendor = "Oracle Corporation";
281 uint32_t spec_version = JDK_Version::current().major_version();
282
283 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
284
285 PropertyList_add(&_system_properties,
286 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
287 PropertyList_add(&_system_properties,
288 new SystemProperty("java.vm.specification.version", buffer, false));
289 PropertyList_add(&_system_properties,
290 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
291 }
292
293 /*
294 * -XX argument processing:
295 *
296 * -XX arguments are defined in several places, such as:
297 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
298 * -XX arguments are parsed in parse_argument().
299 * -XX argument bounds checking is done in check_vm_args_consistency().
300 *
301 * Over time -XX arguments may change. There are mechanisms to handle common cases:
302 *
303 * ALIASED: An option that is simply another name for another option. This is often
304 * part of the process of deprecating a flag, but not all aliases need
305 * to be deprecated.
306 *
307 * Create an alias for an option by adding the old and new option names to the
308 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
309 *
310 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
311 * support may be removed in the future. Both regular and aliased options may be
312 * deprecated.
313 *
314 * Add a deprecation warning for an option (or alias) by adding an entry in the
315 * "special_jvm_flags" table and setting the "deprecated_in" field.
316 * Often an option "deprecated" in one major release will
317 * be made "obsolete" in the next. In this case the entry should also have it's
318 * "obsolete_in" field set.
319 *
320 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
321 * on the command line. A warning is printed to let the user know that option might not
322 * be accepted in the future.
323 *
324 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
325 * table and setting the "obsolete_in" field.
326 *
327 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
328 * to the current JDK version. The system will flatly refuse to admit the existence of
329 * the flag. This allows a flag to die automatically over JDK releases.
330 *
331 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
332 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
333 * - Newly obsolete or expired deprecated options should have their global variable
334 * definitions removed (from globals.hpp, etc) and related implementations removed.
335 *
336 * Recommended approach for removing options:
337 *
338 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
339 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
340 *
341 * To remove internal options (e.g. diagnostic, experimental, develop options), use
342 * a 2-step model adding major release numbers to the obsolete and expire columns.
343 *
344 * To change the name of an option, use the alias table as well as a 2-step
345 * model adding major release numbers to the deprecate and expire columns.
346 * Think twice about aliasing commonly used customer options.
347 *
348 * There are times when it is appropriate to leave a future release number as undefined.
349 *
350 * Tests: Aliases should be tested in VMAliasOptions.java.
351 * Deprecated options should be tested in VMDeprecatedOptions.java.
352 */
353
354 // Obsolete or deprecated -XX flag.
355 typedef struct {
356 const char* name;
357 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
358 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
359 JDK_Version expired_in; // When the option expires (or "undefined").
360 } SpecialFlag;
361
362 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
363 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
364 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
365 // the command-line as usual, but will issue a warning.
366 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
367 // the command-line, while issuing a warning and ignoring the flag value.
368 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
369 // existence of the flag.
370 //
371 // MANUAL CLEANUP ON JDK VERSION UPDATES:
372 // This table ensures that the handling of options will update automatically when the JDK
373 // version is incremented, but the source code needs to be cleanup up manually:
374 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
375 // variable should be removed, as well as users of the variable.
376 // - As "deprecated" options age into "obsolete" options, move the entry into the
377 // "Obsolete Flags" section of the table.
378 // - All expired options should be removed from the table.
379 static SpecialFlag const special_jvm_flags[] = {
380 // -------------- Deprecated Flags --------------
381 // --- Non-alias flags - sorted by obsolete_in then expired_in:
382 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
386
387 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
388 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
390 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
392 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
393 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
394 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
395
396 // -------------- Obsolete Flags - sorted by expired_in --------------
397 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
410 #ifndef ZERO
411 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 #endif // ZERO
414 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
422 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
423 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
424 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
425
426 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
427 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
428 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
429 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
430 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
431 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
432 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
433 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
434 #endif
435
436 { NULL, JDK_Version(0), JDK_Version(0) }
437 };
438
439 // Flags that are aliases for other flags.
440 typedef struct {
441 const char* alias_name;
442 const char* real_name;
443 } AliasedFlag;
444
445 static AliasedFlag const aliased_jvm_flags[] = {
446 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
447 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
448 { "CMSMarkStackSize", "MarkStackSize" },
449 { "G1MarkStackSize", "MarkStackSize" },
450 { "ParallelMarkingThreads", "ConcGCThreads" },
451 { "ParallelCMSThreads", "ConcGCThreads" },
452 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
453 { NULL, NULL}
454 };
455
456 // NOTE: A compatibility request will be necessary for each alias to be removed.
457 static AliasedLoggingFlag const aliased_logging_flags[] = {
458 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
459 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
460 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
461 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
462 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
463 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
464 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
465 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
466 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
467 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
468 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
469 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
470 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
471 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
472 };
473
474 #ifndef PRODUCT
475 // These options are removed in jdk9. Remove this code for jdk10.
476 static AliasedFlag const removed_develop_logging_flags[] = {
477 { "TraceClassInitialization", "-Xlog:class+init" },
478 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
479 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
480 { "TraceItables", "-Xlog:itables=debug" },
481 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
482 { "TraceSafepoint", "-Xlog:safepoint=debug" },
483 { "TraceStartupTime", "-Xlog:startuptime" },
484 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
485 { "PrintVtables", "-Xlog:vtables=debug" },
486 { "VerboseVerification", "-Xlog:verification" },
487 { NULL, NULL }
488 };
489 #endif //PRODUCT
490
491 // Return true if "v" is less than "other", where "other" may be "undefined".
492 static bool version_less_than(JDK_Version v, JDK_Version other) {
493 assert(!v.is_undefined(), "must be defined");
494 if (!other.is_undefined() && v.compare(other) >= 0) {
495 return false;
496 } else {
497 return true;
498 }
499 }
500
501 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
502 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
503 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
504 flag = special_jvm_flags[i];
505 return true;
506 }
507 }
508 return false;
509 }
510
511 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
512 assert(version != NULL, "Must provide a version buffer");
513 SpecialFlag flag;
514 if (lookup_special_flag(flag_name, flag)) {
515 if (!flag.obsolete_in.is_undefined()) {
516 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
517 *version = flag.obsolete_in;
518 return true;
519 }
520 }
521 }
522 return false;
523 }
524
525 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
526 assert(version != NULL, "Must provide a version buffer");
527 SpecialFlag flag;
528 if (lookup_special_flag(flag_name, flag)) {
529 if (!flag.deprecated_in.is_undefined()) {
530 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
531 version_less_than(JDK_Version::current(), flag.expired_in)) {
532 *version = flag.deprecated_in;
533 return 1;
534 } else {
535 return -1;
536 }
537 }
538 }
539 return 0;
540 }
541
542 #ifndef PRODUCT
543 const char* Arguments::removed_develop_logging_flag_name(const char* name){
544 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
545 const AliasedFlag& flag = removed_develop_logging_flags[i];
546 if (strcmp(flag.alias_name, name) == 0) {
547 return flag.real_name;
548 }
549 }
550 return NULL;
551 }
552 #endif // PRODUCT
553
554 const char* Arguments::real_flag_name(const char *flag_name) {
555 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
556 const AliasedFlag& flag_status = aliased_jvm_flags[i];
557 if (strcmp(flag_status.alias_name, flag_name) == 0) {
558 return flag_status.real_name;
559 }
560 }
561 return flag_name;
562 }
563
564 #ifdef ASSERT
565 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
566 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
567 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
568 return true;
569 }
570 }
571 return false;
572 }
573
574 static bool verify_special_jvm_flags() {
575 bool success = true;
576 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
577 const SpecialFlag& flag = special_jvm_flags[i];
578 if (lookup_special_flag(flag.name, i)) {
579 warning("Duplicate special flag declaration \"%s\"", flag.name);
580 success = false;
581 }
582 if (flag.deprecated_in.is_undefined() &&
583 flag.obsolete_in.is_undefined()) {
584 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
585 success = false;
586 }
587
588 if (!flag.deprecated_in.is_undefined()) {
589 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
590 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
591 success = false;
592 }
593
594 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
595 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
596 success = false;
597 }
598 }
599
600 if (!flag.obsolete_in.is_undefined()) {
601 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
602 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
603 success = false;
604 }
605
606 // if flag has become obsolete it should not have a "globals" flag defined anymore.
607 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
608 if (Flag::find_flag(flag.name) != NULL) {
609 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
610 success = false;
611 }
612 }
613 }
614
615 if (!flag.expired_in.is_undefined()) {
616 // if flag has become expired it should not have a "globals" flag defined anymore.
617 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
618 if (Flag::find_flag(flag.name) != NULL) {
619 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
620 success = false;
621 }
622 }
623 }
624
625 }
626 return success;
627 }
628 #endif
629
630 // Parses a size specification string.
631 bool Arguments::atojulong(const char *s, julong* result) {
632 julong n = 0;
633
634 // First char must be a digit. Don't allow negative numbers or leading spaces.
635 if (!isdigit(*s)) {
636 return false;
637 }
638
639 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
640 char* remainder;
641 errno = 0;
642 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
643 if (errno != 0) {
644 return false;
645 }
646
647 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
648 if (remainder == s || strlen(remainder) > 1) {
649 return false;
650 }
651
652 switch (*remainder) {
653 case 'T': case 't':
654 *result = n * G * K;
655 // Check for overflow.
656 if (*result/((julong)G * K) != n) return false;
657 return true;
658 case 'G': case 'g':
659 *result = n * G;
660 if (*result/G != n) return false;
661 return true;
662 case 'M': case 'm':
663 *result = n * M;
664 if (*result/M != n) return false;
665 return true;
666 case 'K': case 'k':
667 *result = n * K;
668 if (*result/K != n) return false;
669 return true;
670 case '\0':
671 *result = n;
672 return true;
673 default:
674 return false;
675 }
676 }
677
678 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
679 if (size < min_size) return arg_too_small;
680 // Check that size will fit in a size_t (only relevant on 32-bit)
681 if (size > max_uintx) return arg_too_big;
682 return arg_in_range;
683 }
684
685 // Describe an argument out of range error
686 void Arguments::describe_range_error(ArgsRange errcode) {
687 switch(errcode) {
688 case arg_too_big:
689 jio_fprintf(defaultStream::error_stream(),
690 "The specified size exceeds the maximum "
691 "representable size.\n");
692 break;
693 case arg_too_small:
694 case arg_unreadable:
695 case arg_in_range:
696 // do nothing for now
697 break;
698 default:
699 ShouldNotReachHere();
700 }
701 }
702
703 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
704 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
705 return true;
706 } else {
707 return false;
708 }
709 }
710
711 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
712 char* end;
713 errno = 0;
714 double v = strtod(value, &end);
715 if ((errno != 0) || (*end != 0)) {
716 return false;
717 }
718
719 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
720 return true;
721 }
722 return false;
723 }
724
725 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
726 julong v;
727 int int_v;
728 intx intx_v;
729 bool is_neg = false;
730 Flag* result = Flag::find_flag(name, strlen(name));
731
732 if (result == NULL) {
733 return false;
734 }
735
736 // Check the sign first since atojulong() parses only unsigned values.
737 if (*value == '-') {
738 if (!result->is_intx() && !result->is_int()) {
739 return false;
740 }
741 value++;
742 is_neg = true;
743 }
744 if (!Arguments::atojulong(value, &v)) {
745 return false;
746 }
747 if (result->is_int()) {
748 int_v = (int) v;
749 if (is_neg) {
750 int_v = -int_v;
751 }
752 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
753 } else if (result->is_uint()) {
754 uint uint_v = (uint) v;
755 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
756 } else if (result->is_intx()) {
757 intx_v = (intx) v;
758 if (is_neg) {
759 intx_v = -intx_v;
760 }
761 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
762 } else if (result->is_uintx()) {
763 uintx uintx_v = (uintx) v;
764 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
765 } else if (result->is_uint64_t()) {
766 uint64_t uint64_t_v = (uint64_t) v;
767 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
768 } else if (result->is_size_t()) {
769 size_t size_t_v = (size_t) v;
770 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
771 } else {
772 return false;
773 }
774 }
775
776 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
777 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
778 // Contract: CommandLineFlags always returns a pointer that needs freeing.
779 FREE_C_HEAP_ARRAY(char, value);
780 return true;
781 }
782
783 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
784 const char* old_value = "";
785 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
786 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
787 size_t new_len = strlen(new_value);
788 const char* value;
789 char* free_this_too = NULL;
790 if (old_len == 0) {
791 value = new_value;
792 } else if (new_len == 0) {
793 value = old_value;
794 } else {
795 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
796 // each new setting adds another LINE to the switch:
797 sprintf(buf, "%s\n%s", old_value, new_value);
798 value = buf;
799 free_this_too = buf;
800 }
801 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
802 // CommandLineFlags always returns a pointer that needs freeing.
803 FREE_C_HEAP_ARRAY(char, value);
804 if (free_this_too != NULL) {
805 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
806 FREE_C_HEAP_ARRAY(char, free_this_too);
807 }
808 return true;
809 }
810
811 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
812 const char* real_name = real_flag_name(arg);
813 JDK_Version since = JDK_Version();
814 switch (is_deprecated_flag(arg, &since)) {
815 case -1:
816 return NULL; // obsolete or expired, don't process normally
817 case 0:
818 return real_name;
819 case 1: {
820 if (warn) {
821 char version[256];
822 since.to_string(version, sizeof(version));
823 if (real_name != arg) {
824 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
825 arg, version, real_name);
826 } else {
827 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
828 arg, version);
829 }
830 }
831 return real_name;
832 }
833 }
834 ShouldNotReachHere();
835 return NULL;
836 }
837
838 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
839 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
840 // Set tagset string buffer at max size of 256, large enough for any alias tagset
841 const int max_tagset_size = 256;
842 int max_tagset_len = max_tagset_size - 1;
843 char tagset_buffer[max_tagset_size];
844 tagset_buffer[0] = '\0';
845
846 // Write tag-set for aliased logging option, in string list form
847 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
848 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
849 if (i > 0) {
850 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
851 }
852 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
853 }
854 if (!alf.exactMatch) {
855 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
856 }
857 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
858 (on) ? "+" : "-",
859 name,
860 tagset_buffer,
861 (on) ? LogLevel::name(alf.level) : "off");
862 }
863
864 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
865 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
866 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
867 if (strcmp(alf.alias_name, name) == 0) {
868 log_deprecated_flag(name, on, alf);
869 return alf;
870 }
871 }
872 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
873 return a;
874 }
875
876 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
877
878 // range of acceptable characters spelled out for portability reasons
879 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
880 #define BUFLEN 255
881 char name[BUFLEN+1];
882 char dummy;
883 const char* real_name;
884 bool warn_if_deprecated = true;
885
886 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
887 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
888 if (alf.alias_name != NULL){
889 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
890 return true;
891 }
892 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
893 if (real_name == NULL) {
894 return false;
895 }
896 return set_bool_flag(real_name, false, origin);
897 }
898 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
899 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
900 if (alf.alias_name != NULL){
901 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
902 return true;
903 }
904 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
905 if (real_name == NULL) {
906 return false;
907 }
908 return set_bool_flag(real_name, true, origin);
909 }
910
911 char punct;
912 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
913 const char* value = strchr(arg, '=') + 1;
914 Flag* flag;
915
916 // this scanf pattern matches both strings (handled here) and numbers (handled later))
917 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
918 if (alf.alias_name != NULL) {
919 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
920 return true;
921 }
922 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
923 if (real_name == NULL) {
924 return false;
925 }
926 flag = Flag::find_flag(real_name);
927 if (flag != NULL && flag->is_ccstr()) {
928 if (flag->ccstr_accumulates()) {
929 return append_to_string_flag(real_name, value, origin);
930 } else {
931 if (value[0] == '\0') {
932 value = NULL;
933 }
934 return set_string_flag(real_name, value, origin);
935 }
936 } else {
937 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
938 }
939 }
940
941 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
942 const char* value = strchr(arg, '=') + 1;
943 // -XX:Foo:=xxx will reset the string flag to the given value.
944 if (value[0] == '\0') {
945 value = NULL;
946 }
947 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
948 if (real_name == NULL) {
949 return false;
950 }
951 return set_string_flag(real_name, value, origin);
952 }
953
954 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
955 #define SIGNED_NUMBER_RANGE "[-0123456789]"
956 #define NUMBER_RANGE "[0123456789eE+-]"
957 char value[BUFLEN + 1];
958 char value2[BUFLEN + 1];
959 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
960 // Looks like a floating-point number -- try again with more lenient format string
961 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
962 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
963 if (real_name == NULL) {
964 return false;
965 }
966 return set_fp_numeric_flag(real_name, value, origin);
967 }
968 }
969
970 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
971 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
972 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
973 if (real_name == NULL) {
974 return false;
975 }
976 return set_numeric_flag(real_name, value, origin);
977 }
978
979 return false;
980 }
981
982 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
983 assert(bldarray != NULL, "illegal argument");
984
985 if (arg == NULL) {
986 return;
987 }
988
989 int new_count = *count + 1;
990
991 // expand the array and add arg to the last element
992 if (*bldarray == NULL) {
993 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
994 } else {
995 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
996 }
997 (*bldarray)[*count] = os::strdup_check_oom(arg);
998 *count = new_count;
999 }
1000
1001 void Arguments::build_jvm_args(const char* arg) {
1002 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1003 }
1004
1005 void Arguments::build_jvm_flags(const char* arg) {
1006 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1007 }
1008
1009 // utility function to return a string that concatenates all
1010 // strings in a given char** array
1011 const char* Arguments::build_resource_string(char** args, int count) {
1012 if (args == NULL || count == 0) {
1013 return NULL;
1014 }
1015 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1016 for (int i = 1; i < count; i++) {
1017 length += strlen(args[i]) + 1; // add 1 for a space
1018 }
1019 char* s = NEW_RESOURCE_ARRAY(char, length);
1020 strcpy(s, args[0]);
1021 for (int j = 1; j < count; j++) {
1022 strcat(s, " ");
1023 strcat(s, args[j]);
1024 }
1025 return (const char*) s;
1026 }
1027
1028 void Arguments::print_on(outputStream* st) {
1029 st->print_cr("VM Arguments:");
1030 if (num_jvm_flags() > 0) {
1031 st->print("jvm_flags: "); print_jvm_flags_on(st);
1032 st->cr();
1033 }
1034 if (num_jvm_args() > 0) {
1035 st->print("jvm_args: "); print_jvm_args_on(st);
1036 st->cr();
1037 }
1038 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1039 if (_java_class_path != NULL) {
1040 char* path = _java_class_path->value();
1041 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1042 }
1043 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1044 }
1045
1046 void Arguments::print_summary_on(outputStream* st) {
1047 // Print the command line. Environment variables that are helpful for
1048 // reproducing the problem are written later in the hs_err file.
1049 // flags are from setting file
1050 if (num_jvm_flags() > 0) {
1051 st->print_raw("Settings File: ");
1052 print_jvm_flags_on(st);
1053 st->cr();
1054 }
1055 // args are the command line and environment variable arguments.
1056 st->print_raw("Command Line: ");
1057 if (num_jvm_args() > 0) {
1058 print_jvm_args_on(st);
1059 }
1060 // this is the classfile and any arguments to the java program
1061 if (java_command() != NULL) {
1062 st->print("%s", java_command());
1063 }
1064 st->cr();
1065 }
1066
1067 void Arguments::print_jvm_flags_on(outputStream* st) {
1068 if (_num_jvm_flags > 0) {
1069 for (int i=0; i < _num_jvm_flags; i++) {
1070 st->print("%s ", _jvm_flags_array[i]);
1071 }
1072 }
1073 }
1074
1075 void Arguments::print_jvm_args_on(outputStream* st) {
1076 if (_num_jvm_args > 0) {
1077 for (int i=0; i < _num_jvm_args; i++) {
1078 st->print("%s ", _jvm_args_array[i]);
1079 }
1080 }
1081 }
1082
1083 bool Arguments::process_argument(const char* arg,
1084 jboolean ignore_unrecognized,
1085 Flag::Flags origin) {
1086 JDK_Version since = JDK_Version();
1087
1088 if (parse_argument(arg, origin)) {
1089 return true;
1090 }
1091
1092 // Determine if the flag has '+', '-', or '=' characters.
1093 bool has_plus_minus = (*arg == '+' || *arg == '-');
1094 const char* const argname = has_plus_minus ? arg + 1 : arg;
1095
1096 size_t arg_len;
1097 const char* equal_sign = strchr(argname, '=');
1098 if (equal_sign == NULL) {
1099 arg_len = strlen(argname);
1100 } else {
1101 arg_len = equal_sign - argname;
1102 }
1103
1104 // Only make the obsolete check for valid arguments.
1105 if (arg_len <= BUFLEN) {
1106 // Construct a string which consists only of the argument name without '+', '-', or '='.
1107 char stripped_argname[BUFLEN+1];
1108 strncpy(stripped_argname, argname, arg_len);
1109 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1110 if (is_obsolete_flag(stripped_argname, &since)) {
1111 char version[256];
1112 since.to_string(version, sizeof(version));
1113 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1114 return true;
1115 }
1116 #ifndef PRODUCT
1117 else {
1118 const char* replacement;
1119 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1120 log_warning(arguments)("%s has been removed. Please use %s instead.",
1121 stripped_argname,
1122 replacement);
1123 return false;
1124 }
1125 }
1126 #endif //PRODUCT
1127 }
1128
1129 // For locked flags, report a custom error message if available.
1130 // Otherwise, report the standard unrecognized VM option.
1131 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1132 if (found_flag != NULL) {
1133 char locked_message_buf[BUFLEN];
1134 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1135 if (strlen(locked_message_buf) == 0) {
1136 if (found_flag->is_bool() && !has_plus_minus) {
1137 jio_fprintf(defaultStream::error_stream(),
1138 "Missing +/- setting for VM option '%s'\n", argname);
1139 } else if (!found_flag->is_bool() && has_plus_minus) {
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Unexpected +/- setting in VM option '%s'\n", argname);
1142 } else {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Improperly specified VM option '%s'\n", argname);
1145 }
1146 } else {
1147 #ifdef PRODUCT
1148 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1149 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1150 if (ignore_unrecognized && mismatched) {
1151 return true;
1152 }
1153 #endif
1154 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1155 }
1156 } else {
1157 if (ignore_unrecognized) {
1158 return true;
1159 }
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Unrecognized VM option '%s'\n", argname);
1162 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1163 if (fuzzy_matched != NULL) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "Did you mean '%s%s%s'? ",
1166 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1167 fuzzy_matched->_name,
1168 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1169 }
1170 }
1171
1172 // allow for commandline "commenting out" options like -XX:#+Verbose
1173 return arg[0] == '#';
1174 }
1175
1176 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1177 FILE* stream = fopen(file_name, "rb");
1178 if (stream == NULL) {
1179 if (should_exist) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Could not open settings file %s\n", file_name);
1182 return false;
1183 } else {
1184 return true;
1185 }
1186 }
1187
1188 char token[1024];
1189 int pos = 0;
1190
1191 bool in_white_space = true;
1192 bool in_comment = false;
1193 bool in_quote = false;
1194 char quote_c = 0;
1195 bool result = true;
1196
1197 int c = getc(stream);
1198 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1199 if (in_white_space) {
1200 if (in_comment) {
1201 if (c == '\n') in_comment = false;
1202 } else {
1203 if (c == '#') in_comment = true;
1204 else if (!isspace(c)) {
1205 in_white_space = false;
1206 token[pos++] = c;
1207 }
1208 }
1209 } else {
1210 if (c == '\n' || (!in_quote && isspace(c))) {
1211 // token ends at newline, or at unquoted whitespace
1212 // this allows a way to include spaces in string-valued options
1213 token[pos] = '\0';
1214 logOption(token);
1215 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1216 build_jvm_flags(token);
1217 pos = 0;
1218 in_white_space = true;
1219 in_quote = false;
1220 } else if (!in_quote && (c == '\'' || c == '"')) {
1221 in_quote = true;
1222 quote_c = c;
1223 } else if (in_quote && (c == quote_c)) {
1224 in_quote = false;
1225 } else {
1226 token[pos++] = c;
1227 }
1228 }
1229 c = getc(stream);
1230 }
1231 if (pos > 0) {
1232 token[pos] = '\0';
1233 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1234 build_jvm_flags(token);
1235 }
1236 fclose(stream);
1237 return result;
1238 }
1239
1240 //=============================================================================================================
1241 // Parsing of properties (-D)
1242
1243 const char* Arguments::get_property(const char* key) {
1244 return PropertyList_get_value(system_properties(), key);
1245 }
1246
1247 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1248 const char* eq = strchr(prop, '=');
1249 const char* key;
1250 const char* value = "";
1251
1252 if (eq == NULL) {
1253 // property doesn't have a value, thus use passed string
1254 key = prop;
1255 } else {
1256 // property have a value, thus extract it and save to the
1257 // allocated string
1258 size_t key_len = eq - prop;
1259 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1260
1261 strncpy(tmp_key, prop, key_len);
1262 tmp_key[key_len] = '\0';
1263 key = tmp_key;
1264
1265 value = &prop[key_len + 1];
1266 }
1267
1268 if (strcmp(key, "java.compiler") == 0) {
1269 process_java_compiler_argument(value);
1270 // Record value in Arguments, but let it get passed to Java.
1271 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1272 strcmp(key, "sun.java.launcher.pid") == 0) {
1273 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1274 // private and are processed in process_sun_java_launcher_properties();
1275 // the sun.java.launcher property is passed on to the java application
1276 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1277 // append is true, writable is true, internal is false
1278 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1279 WriteableProperty, ExternalProperty);
1280 } else {
1281 if (strcmp(key, "sun.java.command") == 0) {
1282 char *old_java_command = _java_command;
1283 _java_command = os::strdup_check_oom(value, mtArguments);
1284 if (old_java_command != NULL) {
1285 os::free(old_java_command);
1286 }
1287 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1288 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1289 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1290 // its value without going through the property list or making a Java call.
1291 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1292 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1293 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1294 os::free((void *)old_java_vendor_url_bug);
1295 }
1296 }
1297
1298 // Create new property and add at the end of the list
1299 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1300 }
1301
1302 if (key != prop) {
1303 // SystemProperty copy passed value, thus free previously allocated
1304 // memory
1305 FreeHeap((void *)key);
1306 }
1307
1308 return true;
1309 }
1310
1311 // sets or adds a module name to the jdk.module.addmods property
1312 bool Arguments::append_to_addmods_property(const char* module_name) {
1313 const char* key = "jdk.module.addmods";
1314 const char* old_value = Arguments::get_property(key);
1315 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1316 if (old_value != NULL) {
1317 buf_len += strlen(old_value) + 1;
1318 }
1319 char* new_value = AllocateHeap(buf_len, mtArguments);
1320 if (new_value == NULL) {
1321 return false;
1322 }
1323 if (old_value == NULL) {
1324 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1325 } else {
1326 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1327 }
1328 bool added = add_property(new_value, UnwriteableProperty, InternalProperty);
1329 FreeHeap(new_value);
1330 return added;
1331 }
1332
1333 #if INCLUDE_CDS
1334 void Arguments::check_unsupported_dumping_properties() {
1335 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1336 const char* unsupported_properties[5] = { "jdk.module.main",
1337 "jdk.module.path",
1338 "jdk.module.upgrade.path",
1339 "jdk.module.addmods",
1340 "jdk.module.limitmods" };
1341 const char* unsupported_options[5] = { "-m",
1342 "--module-path",
1343 "--upgrade-module-path",
1344 "--add-modules",
1345 "--limit-modules" };
1346 SystemProperty* sp = system_properties();
1347 while (sp != NULL) {
1348 for (int i = 0; i < 5; i++) {
1349 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1350 vm_exit_during_initialization(
1351 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1352 }
1353 }
1354 sp = sp->next();
1355 }
1356
1357 // Check for an exploded module build in use with -Xshare:dump.
1358 if (!has_jimage()) {
1359 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1360 }
1361 }
1362 #endif
1363
1364 //===========================================================================================================
1365 // Setting int/mixed/comp mode flags
1366
1367 void Arguments::set_mode_flags(Mode mode) {
1368 // Set up default values for all flags.
1369 // If you add a flag to any of the branches below,
1370 // add a default value for it here.
1371 set_java_compiler(false);
1372 _mode = mode;
1373
1374 // Ensure Agent_OnLoad has the correct initial values.
1375 // This may not be the final mode; mode may change later in onload phase.
1376 PropertyList_unique_add(&_system_properties, "java.vm.info",
1377 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1378
1379 UseInterpreter = true;
1380 UseCompiler = true;
1381 UseLoopCounter = true;
1382
1383 // Default values may be platform/compiler dependent -
1384 // use the saved values
1385 ClipInlining = Arguments::_ClipInlining;
1386 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1387 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1388 BackgroundCompilation = Arguments::_BackgroundCompilation;
1389 if (TieredCompilation) {
1390 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1391 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1392 }
1393 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1394 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1395 }
1396 }
1397
1398 // Change from defaults based on mode
1399 switch (mode) {
1400 default:
1401 ShouldNotReachHere();
1402 break;
1403 case _int:
1404 UseCompiler = false;
1405 UseLoopCounter = false;
1406 AlwaysCompileLoopMethods = false;
1407 UseOnStackReplacement = false;
1408 break;
1409 case _mixed:
1410 // same as default
1411 break;
1412 case _comp:
1413 UseInterpreter = false;
1414 BackgroundCompilation = false;
1415 ClipInlining = false;
1416 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1417 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1418 // compile a level 4 (C2) and then continue executing it.
1419 if (TieredCompilation) {
1420 Tier3InvokeNotifyFreqLog = 0;
1421 Tier4InvocationThreshold = 0;
1422 }
1423 break;
1424 }
1425 }
1426
1427 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1428 // Conflict: required to use shared spaces (-Xshare:on), but
1429 // incompatible command line options were chosen.
1430
1431 static void no_shared_spaces(const char* message) {
1432 if (RequireSharedSpaces) {
1433 jio_fprintf(defaultStream::error_stream(),
1434 "Class data sharing is inconsistent with other specified options.\n");
1435 vm_exit_during_initialization("Unable to use shared archive.", message);
1436 } else {
1437 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1438 }
1439 }
1440 #endif
1441
1442 // Returns threshold scaled with the value of scale.
1443 // If scale < 0.0, threshold is returned without scaling.
1444 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1445 if (scale == 1.0 || scale < 0.0) {
1446 return threshold;
1447 } else {
1448 return (intx)(threshold * scale);
1449 }
1450 }
1451
1452 // Returns freq_log scaled with the value of scale.
1453 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1454 // If scale < 0.0, freq_log is returned without scaling.
1455 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1456 // Check if scaling is necessary or if negative value was specified.
1457 if (scale == 1.0 || scale < 0.0) {
1458 return freq_log;
1459 }
1460 // Check values to avoid calculating log2 of 0.
1461 if (scale == 0.0 || freq_log == 0) {
1462 return 0;
1463 }
1464 // Determine the maximum notification frequency value currently supported.
1465 // The largest mask value that the interpreter/C1 can handle is
1466 // of length InvocationCounter::number_of_count_bits. Mask values are always
1467 // one bit shorter then the value of the notification frequency. Set
1468 // max_freq_bits accordingly.
1469 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1470 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1471 if (scaled_freq == 0) {
1472 // Return 0 right away to avoid calculating log2 of 0.
1473 return 0;
1474 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1475 return max_freq_bits;
1476 } else {
1477 return log2_intptr(scaled_freq);
1478 }
1479 }
1480
1481 void Arguments::set_tiered_flags() {
1482 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1483 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1484 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1485 }
1486 if (CompilationPolicyChoice < 2) {
1487 vm_exit_during_initialization(
1488 "Incompatible compilation policy selected", NULL);
1489 }
1490 // Increase the code cache size - tiered compiles a lot more.
1491 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1492 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1493 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1494 }
1495 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1496 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1497 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1498 }
1499 if (!UseInterpreter) { // -Xcomp
1500 Tier3InvokeNotifyFreqLog = 0;
1501 Tier4InvocationThreshold = 0;
1502 }
1503
1504 if (CompileThresholdScaling < 0) {
1505 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1506 }
1507
1508 // Scale tiered compilation thresholds.
1509 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1510 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1511 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1512 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1513
1514 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1515 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1516 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1517 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1518
1519 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1520 // once these thresholds become supported.
1521
1522 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1523 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1524
1525 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1526 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1527
1528 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1529
1530 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1531 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1532 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1533 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1534 }
1535 }
1536
1537 #if INCLUDE_ALL_GCS
1538 static void disable_adaptive_size_policy(const char* collector_name) {
1539 if (UseAdaptiveSizePolicy) {
1540 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1541 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1542 collector_name);
1543 }
1544 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1545 }
1546 }
1547
1548 void Arguments::set_parnew_gc_flags() {
1549 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1550 "control point invariant");
1551 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1552 assert(UseParNewGC, "ParNew should always be used with CMS");
1553
1554 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1555 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1556 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1557 } else if (ParallelGCThreads == 0) {
1558 jio_fprintf(defaultStream::error_stream(),
1559 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1560 vm_exit(1);
1561 }
1562
1563 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1564 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1565 // we set them to 1024 and 1024.
1566 // See CR 6362902.
1567 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1568 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1569 }
1570 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1571 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1572 }
1573
1574 // When using compressed oops, we use local overflow stacks,
1575 // rather than using a global overflow list chained through
1576 // the klass word of the object's pre-image.
1577 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1578 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1579 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1580 }
1581 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1582 }
1583 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1584 }
1585
1586 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1587 // sparc/solaris for certain applications, but would gain from
1588 // further optimization and tuning efforts, and would almost
1589 // certainly gain from analysis of platform and environment.
1590 void Arguments::set_cms_and_parnew_gc_flags() {
1591 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1592 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1593 assert(UseParNewGC, "ParNew should always be used with CMS");
1594
1595 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1596 disable_adaptive_size_policy("UseConcMarkSweepGC");
1597
1598 set_parnew_gc_flags();
1599
1600 size_t max_heap = align_size_down(MaxHeapSize,
1601 CardTableRS::ct_max_alignment_constraint());
1602
1603 // Now make adjustments for CMS
1604 intx tenuring_default = (intx)6;
1605 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1606
1607 // Preferred young gen size for "short" pauses:
1608 // upper bound depends on # of threads and NewRatio.
1609 const size_t preferred_max_new_size_unaligned =
1610 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1611 size_t preferred_max_new_size =
1612 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1613
1614 // Unless explicitly requested otherwise, size young gen
1615 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1616
1617 // If either MaxNewSize or NewRatio is set on the command line,
1618 // assume the user is trying to set the size of the young gen.
1619 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1620
1621 // Set MaxNewSize to our calculated preferred_max_new_size unless
1622 // NewSize was set on the command line and it is larger than
1623 // preferred_max_new_size.
1624 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1625 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1626 } else {
1627 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1628 }
1629 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1630
1631 // Code along this path potentially sets NewSize and OldSize
1632 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1633 min_heap_size(), InitialHeapSize, max_heap);
1634 size_t min_new = preferred_max_new_size;
1635 if (FLAG_IS_CMDLINE(NewSize)) {
1636 min_new = NewSize;
1637 }
1638 if (max_heap > min_new && min_heap_size() > min_new) {
1639 // Unless explicitly requested otherwise, make young gen
1640 // at least min_new, and at most preferred_max_new_size.
1641 if (FLAG_IS_DEFAULT(NewSize)) {
1642 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1643 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1644 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1645 }
1646 // Unless explicitly requested otherwise, size old gen
1647 // so it's NewRatio x of NewSize.
1648 if (FLAG_IS_DEFAULT(OldSize)) {
1649 if (max_heap > NewSize) {
1650 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1651 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1652 }
1653 }
1654 }
1655 }
1656 // Unless explicitly requested otherwise, definitely
1657 // promote all objects surviving "tenuring_default" scavenges.
1658 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1659 FLAG_IS_DEFAULT(SurvivorRatio)) {
1660 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1661 }
1662 // If we decided above (or user explicitly requested)
1663 // `promote all' (via MaxTenuringThreshold := 0),
1664 // prefer minuscule survivor spaces so as not to waste
1665 // space for (non-existent) survivors
1666 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1667 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1668 }
1669
1670 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1671 // but rather the number of free blocks of a given size that are used when
1672 // replenishing the local per-worker free list caches.
1673 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1674 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1675 // OldPLAB sizing manually turned off: Use a larger default setting,
1676 // unless it was manually specified. This is because a too-low value
1677 // will slow down scavenges.
1678 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1679 } else {
1680 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1681 }
1682 }
1683
1684 // If either of the static initialization defaults have changed, note this
1685 // modification.
1686 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1687 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1688 }
1689
1690 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1691 }
1692 #endif // INCLUDE_ALL_GCS
1693
1694 void set_object_alignment() {
1695 // Object alignment.
1696 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1697 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1698 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1699 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1700 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1701 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1702
1703 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1704 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1705
1706 // Oop encoding heap max
1707 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1708
1709 if (SurvivorAlignmentInBytes == 0) {
1710 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1711 }
1712
1713 #if INCLUDE_ALL_GCS
1714 // Set CMS global values
1715 CompactibleFreeListSpace::set_cms_values();
1716 #endif // INCLUDE_ALL_GCS
1717 }
1718
1719 size_t Arguments::max_heap_for_compressed_oops() {
1720 // Avoid sign flip.
1721 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1722 // We need to fit both the NULL page and the heap into the memory budget, while
1723 // keeping alignment constraints of the heap. To guarantee the latter, as the
1724 // NULL page is located before the heap, we pad the NULL page to the conservative
1725 // maximum alignment that the GC may ever impose upon the heap.
1726 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1727 _conservative_max_heap_alignment);
1728
1729 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1730 NOT_LP64(ShouldNotReachHere(); return 0);
1731 }
1732
1733 bool Arguments::should_auto_select_low_pause_collector() {
1734 if (UseAutoGCSelectPolicy &&
1735 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1736 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1737 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1738 return true;
1739 }
1740 return false;
1741 }
1742
1743 void Arguments::set_use_compressed_oops() {
1744 #ifndef ZERO
1745 #ifdef _LP64
1746 // MaxHeapSize is not set up properly at this point, but
1747 // the only value that can override MaxHeapSize if we are
1748 // to use UseCompressedOops is InitialHeapSize.
1749 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1750
1751 if (max_heap_size <= max_heap_for_compressed_oops()) {
1752 #if !defined(COMPILER1) || defined(TIERED)
1753 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1754 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1755 }
1756 #endif
1757 } else {
1758 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1759 warning("Max heap size too large for Compressed Oops");
1760 FLAG_SET_DEFAULT(UseCompressedOops, false);
1761 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1762 }
1763 }
1764 #endif // _LP64
1765 #endif // ZERO
1766 }
1767
1768
1769 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1770 // set_use_compressed_oops().
1771 void Arguments::set_use_compressed_klass_ptrs() {
1772 #ifndef ZERO
1773 #ifdef _LP64
1774 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1775 if (!UseCompressedOops) {
1776 if (UseCompressedClassPointers) {
1777 warning("UseCompressedClassPointers requires UseCompressedOops");
1778 }
1779 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1780 } else {
1781 // Turn on UseCompressedClassPointers too
1782 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1783 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1784 }
1785 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1786 if (UseCompressedClassPointers) {
1787 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1788 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1789 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1790 }
1791 }
1792 }
1793 #endif // _LP64
1794 #endif // !ZERO
1795 }
1796
1797 void Arguments::set_conservative_max_heap_alignment() {
1798 // The conservative maximum required alignment for the heap is the maximum of
1799 // the alignments imposed by several sources: any requirements from the heap
1800 // itself, the collector policy and the maximum page size we may run the VM
1801 // with.
1802 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1803 #if INCLUDE_ALL_GCS
1804 if (UseParallelGC) {
1805 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1806 } else if (UseG1GC) {
1807 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1808 }
1809 #endif // INCLUDE_ALL_GCS
1810 _conservative_max_heap_alignment = MAX4(heap_alignment,
1811 (size_t)os::vm_allocation_granularity(),
1812 os::max_page_size(),
1813 CollectorPolicy::compute_heap_alignment());
1814 }
1815
1816 bool Arguments::gc_selected() {
1817 #if INCLUDE_ALL_GCS
1818 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1819 #else
1820 return UseSerialGC;
1821 #endif // INCLUDE_ALL_GCS
1822 }
1823
1824 void Arguments::select_gc_ergonomically() {
1825 #if INCLUDE_ALL_GCS
1826 if (os::is_server_class_machine()) {
1827 if (should_auto_select_low_pause_collector()) {
1828 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1829 } else {
1830 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1831 }
1832 } else {
1833 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1834 }
1835 #else
1836 UNSUPPORTED_OPTION(UseG1GC);
1837 UNSUPPORTED_OPTION(UseParallelGC);
1838 UNSUPPORTED_OPTION(UseParallelOldGC);
1839 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1840 UNSUPPORTED_OPTION(UseParNewGC);
1841 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1842 #endif // INCLUDE_ALL_GCS
1843 }
1844
1845 void Arguments::select_gc() {
1846 if (!gc_selected()) {
1847 select_gc_ergonomically();
1848 if (!gc_selected()) {
1849 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1850 }
1851 }
1852 }
1853
1854 void Arguments::set_ergonomics_flags() {
1855 select_gc();
1856
1857 #if defined(COMPILER2) || INCLUDE_JVMCI
1858 // Shared spaces work fine with other GCs but causes bytecode rewriting
1859 // to be disabled, which hurts interpreter performance and decreases
1860 // server performance. When -server is specified, keep the default off
1861 // unless it is asked for. Future work: either add bytecode rewriting
1862 // at link time, or rewrite bytecodes in non-shared methods.
1863 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1864 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1865 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1866 }
1867 #endif
1868
1869 set_conservative_max_heap_alignment();
1870
1871 #ifndef ZERO
1872 #ifdef _LP64
1873 set_use_compressed_oops();
1874
1875 // set_use_compressed_klass_ptrs() must be called after calling
1876 // set_use_compressed_oops().
1877 set_use_compressed_klass_ptrs();
1878
1879 // Also checks that certain machines are slower with compressed oops
1880 // in vm_version initialization code.
1881 #endif // _LP64
1882 #endif // !ZERO
1883
1884 CodeCacheExtensions::set_ergonomics_flags();
1885 }
1886
1887 void Arguments::set_parallel_gc_flags() {
1888 assert(UseParallelGC || UseParallelOldGC, "Error");
1889 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1890 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1891 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1892 }
1893 FLAG_SET_DEFAULT(UseParallelGC, true);
1894
1895 // If no heap maximum was requested explicitly, use some reasonable fraction
1896 // of the physical memory, up to a maximum of 1GB.
1897 FLAG_SET_DEFAULT(ParallelGCThreads,
1898 Abstract_VM_Version::parallel_worker_threads());
1899 if (ParallelGCThreads == 0) {
1900 jio_fprintf(defaultStream::error_stream(),
1901 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1902 vm_exit(1);
1903 }
1904
1905 if (UseAdaptiveSizePolicy) {
1906 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1907 // unless the user actually sets these flags.
1908 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1909 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1910 }
1911 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1912 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1913 }
1914 }
1915
1916 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1917 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1918 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1919 // See CR 6362902 for details.
1920 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1921 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1922 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1923 }
1924 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1925 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1926 }
1927 }
1928
1929 if (UseParallelOldGC) {
1930 // Par compact uses lower default values since they are treated as
1931 // minimums. These are different defaults because of the different
1932 // interpretation and are not ergonomically set.
1933 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1934 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1935 }
1936 }
1937 }
1938
1939 void Arguments::set_g1_gc_flags() {
1940 assert(UseG1GC, "Error");
1941 #if defined(COMPILER1) || INCLUDE_JVMCI
1942 FastTLABRefill = false;
1943 #endif
1944 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1945 if (ParallelGCThreads == 0) {
1946 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1947 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1948 }
1949
1950 #if INCLUDE_ALL_GCS
1951 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1952 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1953 }
1954 #endif
1955
1956 // MarkStackSize will be set (if it hasn't been set by the user)
1957 // when concurrent marking is initialized.
1958 // Its value will be based upon the number of parallel marking threads.
1959 // But we do set the maximum mark stack size here.
1960 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1961 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1962 }
1963
1964 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1965 // In G1, we want the default GC overhead goal to be higher than
1966 // it is for PS, or the heap might be expanded too aggressively.
1967 // We set it here to ~8%.
1968 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1969 }
1970
1971 // Below, we might need to calculate the pause time interval based on
1972 // the pause target. When we do so we are going to give G1 maximum
1973 // flexibility and allow it to do pauses when it needs to. So, we'll
1974 // arrange that the pause interval to be pause time target + 1 to
1975 // ensure that a) the pause time target is maximized with respect to
1976 // the pause interval and b) we maintain the invariant that pause
1977 // time target < pause interval. If the user does not want this
1978 // maximum flexibility, they will have to set the pause interval
1979 // explicitly.
1980
1981 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1982 // The default pause time target in G1 is 200ms
1983 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1984 }
1985
1986 // Then, if the interval parameter was not set, set it according to
1987 // the pause time target (this will also deal with the case when the
1988 // pause time target is the default value).
1989 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1990 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1991 }
1992
1993 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1994 }
1995
1996 void Arguments::set_gc_specific_flags() {
1997 #if INCLUDE_ALL_GCS
1998 // Set per-collector flags
1999 if (UseParallelGC || UseParallelOldGC) {
2000 set_parallel_gc_flags();
2001 } else if (UseConcMarkSweepGC) {
2002 set_cms_and_parnew_gc_flags();
2003 } else if (UseG1GC) {
2004 set_g1_gc_flags();
2005 }
2006 if (AssumeMP && !UseSerialGC) {
2007 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2008 warning("If the number of processors is expected to increase from one, then"
2009 " you should configure the number of parallel GC threads appropriately"
2010 " using -XX:ParallelGCThreads=N");
2011 }
2012 }
2013 if (MinHeapFreeRatio == 100) {
2014 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2015 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2016 }
2017
2018 // If class unloading is disabled, also disable concurrent class unloading.
2019 if (!ClassUnloading) {
2020 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2021 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2022 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2023 }
2024 #endif // INCLUDE_ALL_GCS
2025 }
2026
2027 julong Arguments::limit_by_allocatable_memory(julong limit) {
2028 julong max_allocatable;
2029 julong result = limit;
2030 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2031 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2032 }
2033 return result;
2034 }
2035
2036 // Use static initialization to get the default before parsing
2037 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2038
2039 void Arguments::set_heap_size() {
2040 const julong phys_mem =
2041 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2042 : (julong)MaxRAM;
2043
2044 // If the maximum heap size has not been set with -Xmx,
2045 // then set it as fraction of the size of physical memory,
2046 // respecting the maximum and minimum sizes of the heap.
2047 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2048 julong reasonable_max = phys_mem / MaxRAMFraction;
2049
2050 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2051 // Small physical memory, so use a minimum fraction of it for the heap
2052 reasonable_max = phys_mem / MinRAMFraction;
2053 } else {
2054 // Not-small physical memory, so require a heap at least
2055 // as large as MaxHeapSize
2056 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2057 }
2058 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2059 // Limit the heap size to ErgoHeapSizeLimit
2060 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2061 }
2062 if (UseCompressedOops) {
2063 // Limit the heap size to the maximum possible when using compressed oops
2064 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2065
2066 // HeapBaseMinAddress can be greater than default but not less than.
2067 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2068 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2069 // matches compressed oops printing flags
2070 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2071 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2072 DefaultHeapBaseMinAddress,
2073 DefaultHeapBaseMinAddress/G,
2074 HeapBaseMinAddress);
2075 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2076 }
2077 }
2078
2079 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2080 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2081 // but it should be not less than default MaxHeapSize.
2082 max_coop_heap -= HeapBaseMinAddress;
2083 }
2084 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2085 }
2086 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2087
2088 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2089 // An initial heap size was specified on the command line,
2090 // so be sure that the maximum size is consistent. Done
2091 // after call to limit_by_allocatable_memory because that
2092 // method might reduce the allocation size.
2093 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2094 }
2095
2096 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2097 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2098 }
2099
2100 // If the minimum or initial heap_size have not been set or requested to be set
2101 // ergonomically, set them accordingly.
2102 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2103 julong reasonable_minimum = (julong)(OldSize + NewSize);
2104
2105 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2106
2107 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2108
2109 if (InitialHeapSize == 0) {
2110 julong reasonable_initial = phys_mem / InitialRAMFraction;
2111
2112 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2113 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2114
2115 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2116
2117 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2118 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2119 }
2120 // If the minimum heap size has not been set (via -Xms),
2121 // synchronize with InitialHeapSize to avoid errors with the default value.
2122 if (min_heap_size() == 0) {
2123 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2124 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2125 }
2126 }
2127 }
2128
2129 // This option inspects the machine and attempts to set various
2130 // parameters to be optimal for long-running, memory allocation
2131 // intensive jobs. It is intended for machines with large
2132 // amounts of cpu and memory.
2133 jint Arguments::set_aggressive_heap_flags() {
2134 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2135 // VM, but we may not be able to represent the total physical memory
2136 // available (like having 8gb of memory on a box but using a 32bit VM).
2137 // Thus, we need to make sure we're using a julong for intermediate
2138 // calculations.
2139 julong initHeapSize;
2140 julong total_memory = os::physical_memory();
2141
2142 if (total_memory < (julong) 256 * M) {
2143 jio_fprintf(defaultStream::error_stream(),
2144 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2145 vm_exit(1);
2146 }
2147
2148 // The heap size is half of available memory, or (at most)
2149 // all of possible memory less 160mb (leaving room for the OS
2150 // when using ISM). This is the maximum; because adaptive sizing
2151 // is turned on below, the actual space used may be smaller.
2152
2153 initHeapSize = MIN2(total_memory / (julong) 2,
2154 total_memory - (julong) 160 * M);
2155
2156 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2157
2158 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2159 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 // Currently the minimum size and the initial heap sizes are the same.
2166 set_min_heap_size(initHeapSize);
2167 }
2168 if (FLAG_IS_DEFAULT(NewSize)) {
2169 // Make the young generation 3/8ths of the total heap.
2170 if (FLAG_SET_CMDLINE(size_t, NewSize,
2171 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2175 return JNI_EINVAL;
2176 }
2177 }
2178
2179 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2180 FLAG_SET_DEFAULT(UseLargePages, true);
2181 #endif
2182
2183 // Increase some data structure sizes for efficiency
2184 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2185 return JNI_EINVAL;
2186 }
2187 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193
2194 // See the OldPLABSize comment below, but replace 'after promotion'
2195 // with 'after copying'. YoungPLABSize is the size of the survivor
2196 // space per-gc-thread buffers. The default is 4kw.
2197 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2198 return JNI_EINVAL;
2199 }
2200
2201 // OldPLABSize is the size of the buffers in the old gen that
2202 // UseParallelGC uses to promote live data that doesn't fit in the
2203 // survivor spaces. At any given time, there's one for each gc thread.
2204 // The default size is 1kw. These buffers are rarely used, since the
2205 // survivor spaces are usually big enough. For specjbb, however, there
2206 // are occasions when there's lots of live data in the young gen
2207 // and we end up promoting some of it. We don't have a definite
2208 // explanation for why bumping OldPLABSize helps, but the theory
2209 // is that a bigger PLAB results in retaining something like the
2210 // original allocation order after promotion, which improves mutator
2211 // locality. A minor effect may be that larger PLABs reduce the
2212 // number of PLAB allocation events during gc. The value of 8kw
2213 // was arrived at by experimenting with specjbb.
2214 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2215 return JNI_EINVAL;
2216 }
2217
2218 // Enable parallel GC and adaptive generation sizing
2219 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2220 return JNI_EINVAL;
2221 }
2222 FLAG_SET_DEFAULT(ParallelGCThreads,
2223 Abstract_VM_Version::parallel_worker_threads());
2224
2225 // Encourage steady state memory management
2226 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2227 return JNI_EINVAL;
2228 }
2229
2230 // This appears to improve mutator locality
2231 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2232 return JNI_EINVAL;
2233 }
2234
2235 // Get around early Solaris scheduling bug
2236 // (affinity vs other jobs on system)
2237 // but disallow DR and offlining (5008695).
2238 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2239 return JNI_EINVAL;
2240 }
2241
2242 return JNI_OK;
2243 }
2244
2245 // This must be called after ergonomics.
2246 void Arguments::set_bytecode_flags() {
2247 if (!RewriteBytecodes) {
2248 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2249 }
2250 }
2251
2252 // Aggressive optimization flags -XX:+AggressiveOpts
2253 jint Arguments::set_aggressive_opts_flags() {
2254 #ifdef COMPILER2
2255 if (AggressiveUnboxing) {
2256 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2257 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2258 } else if (!EliminateAutoBox) {
2259 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2260 AggressiveUnboxing = false;
2261 }
2262 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2263 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2264 } else if (!DoEscapeAnalysis) {
2265 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2266 AggressiveUnboxing = false;
2267 }
2268 }
2269 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2270 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2271 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2272 }
2273 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2274 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2275 }
2276
2277 // Feed the cache size setting into the JDK
2278 char buffer[1024];
2279 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2280 if (!add_property(buffer)) {
2281 return JNI_ENOMEM;
2282 }
2283 }
2284 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2285 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2286 }
2287 #endif
2288
2289 if (AggressiveOpts) {
2290 // Sample flag setting code
2291 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2292 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2293 // }
2294 }
2295
2296 return JNI_OK;
2297 }
2298
2299 //===========================================================================================================
2300 // Parsing of java.compiler property
2301
2302 void Arguments::process_java_compiler_argument(const char* arg) {
2303 // For backwards compatibility, Djava.compiler=NONE or ""
2304 // causes us to switch to -Xint mode UNLESS -Xdebug
2305 // is also specified.
2306 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2307 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2308 }
2309 }
2310
2311 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2312 _sun_java_launcher = os::strdup_check_oom(launcher);
2313 }
2314
2315 bool Arguments::created_by_java_launcher() {
2316 assert(_sun_java_launcher != NULL, "property must have value");
2317 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2318 }
2319
2320 bool Arguments::sun_java_launcher_is_altjvm() {
2321 return _sun_java_launcher_is_altjvm;
2322 }
2323
2324 //===========================================================================================================
2325 // Parsing of main arguments
2326
2327 #if INCLUDE_JVMCI
2328 // Check consistency of jvmci vm argument settings.
2329 bool Arguments::check_jvmci_args_consistency() {
2330 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2331 }
2332 #endif //INCLUDE_JVMCI
2333
2334 // Check consistency of GC selection
2335 bool Arguments::check_gc_consistency() {
2336 // Ensure that the user has not selected conflicting sets
2337 // of collectors.
2338 uint i = 0;
2339 if (UseSerialGC) i++;
2340 if (UseConcMarkSweepGC) i++;
2341 if (UseParallelGC || UseParallelOldGC) i++;
2342 if (UseG1GC) i++;
2343 if (i > 1) {
2344 jio_fprintf(defaultStream::error_stream(),
2345 "Conflicting collector combinations in option list; "
2346 "please refer to the release notes for the combinations "
2347 "allowed\n");
2348 return false;
2349 }
2350
2351 if (UseConcMarkSweepGC && !UseParNewGC) {
2352 jio_fprintf(defaultStream::error_stream(),
2353 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2354 return false;
2355 }
2356
2357 if (UseParNewGC && !UseConcMarkSweepGC) {
2358 jio_fprintf(defaultStream::error_stream(),
2359 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2360 return false;
2361 }
2362
2363 return true;
2364 }
2365
2366 // Check the consistency of vm_init_args
2367 bool Arguments::check_vm_args_consistency() {
2368 // Method for adding checks for flag consistency.
2369 // The intent is to warn the user of all possible conflicts,
2370 // before returning an error.
2371 // Note: Needs platform-dependent factoring.
2372 bool status = true;
2373
2374 if (TLABRefillWasteFraction == 0) {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "TLABRefillWasteFraction should be a denominator, "
2377 "not " SIZE_FORMAT "\n",
2378 TLABRefillWasteFraction);
2379 status = false;
2380 }
2381
2382 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2383 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2384 }
2385
2386 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2387 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2388 }
2389
2390 if (GCTimeLimit == 100) {
2391 // Turn off gc-overhead-limit-exceeded checks
2392 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2393 }
2394
2395 status = status && check_gc_consistency();
2396
2397 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2398 // insists that we hold the requisite locks so that the iteration is
2399 // MT-safe. For the verification at start-up and shut-down, we don't
2400 // yet have a good way of acquiring and releasing these locks,
2401 // which are not visible at the CollectedHeap level. We want to
2402 // be able to acquire these locks and then do the iteration rather
2403 // than just disable the lock verification. This will be fixed under
2404 // bug 4788986.
2405 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2406 if (VerifyDuringStartup) {
2407 warning("Heap verification at start-up disabled "
2408 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2409 VerifyDuringStartup = false; // Disable verification at start-up
2410 }
2411
2412 if (VerifyBeforeExit) {
2413 warning("Heap verification at shutdown disabled "
2414 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2415 VerifyBeforeExit = false; // Disable verification at shutdown
2416 }
2417 }
2418
2419 if (PrintNMTStatistics) {
2420 #if INCLUDE_NMT
2421 if (MemTracker::tracking_level() == NMT_off) {
2422 #endif // INCLUDE_NMT
2423 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2424 PrintNMTStatistics = false;
2425 #if INCLUDE_NMT
2426 }
2427 #endif
2428 }
2429 #if INCLUDE_JVMCI
2430
2431 status = status && check_jvmci_args_consistency();
2432
2433 if (EnableJVMCI) {
2434 if (!ScavengeRootsInCode) {
2435 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2436 ScavengeRootsInCode = 1;
2437 }
2438 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2439 TypeProfileLevel = 0;
2440 }
2441 if (UseJVMCICompiler) {
2442 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2443 TypeProfileWidth = 8;
2444 }
2445 }
2446 }
2447 #endif
2448
2449 // Check lower bounds of the code cache
2450 // Template Interpreter code is approximately 3X larger in debug builds.
2451 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2452 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2455 os::vm_page_size()/K);
2456 status = false;
2457 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2460 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2461 status = false;
2462 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2465 min_code_cache_size/K);
2466 status = false;
2467 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2468 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2469 jio_fprintf(defaultStream::error_stream(),
2470 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2471 CODE_CACHE_SIZE_LIMIT/M);
2472 status = false;
2473 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2476 min_code_cache_size/K);
2477 status = false;
2478 }
2479
2480 #ifdef _LP64
2481 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2482 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2483 }
2484 #endif
2485
2486 #ifndef SUPPORT_RESERVED_STACK_AREA
2487 if (StackReservedPages != 0) {
2488 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2489 warning("Reserved Stack Area not supported on this platform");
2490 }
2491 #endif
2492
2493 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2494 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2495 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2496 }
2497 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2498 }
2499 if (UseCompiler && is_interpreter_only()) {
2500 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2501 warning("UseCompiler disabled due to -Xint.");
2502 }
2503 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2504 }
2505 #ifdef COMPILER2
2506 if (PostLoopMultiversioning && !RangeCheckElimination) {
2507 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2508 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2509 }
2510 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2511 }
2512 #endif
2513 return status;
2514 }
2515
2516 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2517 const char* option_type) {
2518 if (ignore) return false;
2519
2520 const char* spacer = " ";
2521 if (option_type == NULL) {
2522 option_type = ++spacer; // Set both to the empty string.
2523 }
2524
2525 if (os::obsolete_option(option)) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Obsolete %s%soption: %s\n", option_type, spacer,
2528 option->optionString);
2529 return false;
2530 } else {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Unrecognized %s%soption: %s\n", option_type, spacer,
2533 option->optionString);
2534 return true;
2535 }
2536 }
2537
2538 static const char* user_assertion_options[] = {
2539 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2540 };
2541
2542 static const char* system_assertion_options[] = {
2543 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2544 };
2545
2546 bool Arguments::parse_uintx(const char* value,
2547 uintx* uintx_arg,
2548 uintx min_size) {
2549
2550 // Check the sign first since atojulong() parses only unsigned values.
2551 bool value_is_positive = !(*value == '-');
2552
2553 if (value_is_positive) {
2554 julong n;
2555 bool good_return = atojulong(value, &n);
2556 if (good_return) {
2557 bool above_minimum = n >= min_size;
2558 bool value_is_too_large = n > max_uintx;
2559
2560 if (above_minimum && !value_is_too_large) {
2561 *uintx_arg = n;
2562 return true;
2563 }
2564 }
2565 }
2566 return false;
2567 }
2568
2569 unsigned int addreads_count = 0;
2570 unsigned int addexports_count = 0;
2571 unsigned int patch_mod_count = 0;
2572 const char* add_modules_value = NULL;
2573
2574 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2575 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2576 char* property = AllocateHeap(prop_len, mtArguments);
2577 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2578 if (ret < 0 || ret >= (int)prop_len) {
2579 FreeHeap(property);
2580 return false;
2581 }
2582 bool added = add_property(property, UnwriteableProperty, internal);
2583 FreeHeap(property);
2584 return added;
2585 }
2586
2587 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2588 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2589 if (count < 1000) {
2590 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2591 char* property = AllocateHeap(prop_len, mtArguments);
2592 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2593 if (ret < 0 || ret >= (int)prop_len) {
2594 FreeHeap(property);
2595 return false;
2596 }
2597 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2598 FreeHeap(property);
2599 return added;
2600 }
2601 return false;
2602 }
2603
2604 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2605 julong* long_arg,
2606 julong min_size) {
2607 if (!atojulong(s, long_arg)) return arg_unreadable;
2608 return check_memory_size(*long_arg, min_size);
2609 }
2610
2611 // Parse JavaVMInitArgs structure
2612
2613 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2614 const JavaVMInitArgs *java_options_args,
2615 const JavaVMInitArgs *cmd_line_args) {
2616 bool patch_mod_javabase = false;
2617
2618 // Save default settings for some mode flags
2619 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2620 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2621 Arguments::_ClipInlining = ClipInlining;
2622 Arguments::_BackgroundCompilation = BackgroundCompilation;
2623 if (TieredCompilation) {
2624 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2625 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2626 }
2627
2628 // Setup flags for mixed which is the default
2629 set_mode_flags(_mixed);
2630
2631 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2632 // variable (if present).
2633 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2634 if (result != JNI_OK) {
2635 return result;
2636 }
2637
2638 // Parse args structure generated from the command line flags.
2639 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2640 if (result != JNI_OK) {
2641 return result;
2642 }
2643
2644 // Parse args structure generated from the _JAVA_OPTIONS environment
2645 // variable (if present) (mimics classic VM)
2646 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2647 if (result != JNI_OK) {
2648 return result;
2649 }
2650
2651 // Do final processing now that all arguments have been parsed
2652 result = finalize_vm_init_args();
2653 if (result != JNI_OK) {
2654 return result;
2655 }
2656
2657 return JNI_OK;
2658 }
2659
2660 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2661 // represents a valid JDWP agent. is_path==true denotes that we
2662 // are dealing with -agentpath (case where name is a path), otherwise with
2663 // -agentlib
2664 bool valid_jdwp_agent(char *name, bool is_path) {
2665 char *_name;
2666 const char *_jdwp = "jdwp";
2667 size_t _len_jdwp, _len_prefix;
2668
2669 if (is_path) {
2670 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2671 return false;
2672 }
2673
2674 _name++; // skip past last path separator
2675 _len_prefix = strlen(JNI_LIB_PREFIX);
2676
2677 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2678 return false;
2679 }
2680
2681 _name += _len_prefix;
2682 _len_jdwp = strlen(_jdwp);
2683
2684 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2685 _name += _len_jdwp;
2686 }
2687 else {
2688 return false;
2689 }
2690
2691 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2692 return false;
2693 }
2694
2695 return true;
2696 }
2697
2698 if (strcmp(name, _jdwp) == 0) {
2699 return true;
2700 }
2701
2702 return false;
2703 }
2704
2705 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2706 // --patch-module=<module>=<file>(<pathsep><file>)*
2707 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2708 // Find the equal sign between the module name and the path specification
2709 const char* module_equal = strchr(patch_mod_tail, '=');
2710 if (module_equal == NULL) {
2711 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2712 return JNI_ERR;
2713 } else {
2714 // Pick out the module name
2715 size_t module_len = module_equal - patch_mod_tail;
2716 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2717 if (module_name != NULL) {
2718 memcpy(module_name, patch_mod_tail, module_len);
2719 *(module_name + module_len) = '\0';
2720 // The path piece begins one past the module_equal sign
2721 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2722 FREE_C_HEAP_ARRAY(char, module_name);
2723 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2724 return JNI_ENOMEM;
2725 }
2726 } else {
2727 return JNI_ENOMEM;
2728 }
2729 }
2730 return JNI_OK;
2731 }
2732
2733 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2734 // For match_option to return remaining or value part of option string
2735 const char* tail;
2736
2737 // iterate over arguments
2738 for (int index = 0; index < args->nOptions; index++) {
2739 bool is_absolute_path = false; // for -agentpath vs -agentlib
2740
2741 const JavaVMOption* option = args->options + index;
2742
2743 if (!match_option(option, "-Djava.class.path", &tail) &&
2744 !match_option(option, "-Dsun.java.command", &tail) &&
2745 !match_option(option, "-Dsun.java.launcher", &tail)) {
2746
2747 // add all jvm options to the jvm_args string. This string
2748 // is used later to set the java.vm.args PerfData string constant.
2749 // the -Djava.class.path and the -Dsun.java.command options are
2750 // omitted from jvm_args string as each have their own PerfData
2751 // string constant object.
2752 build_jvm_args(option->optionString);
2753 }
2754
2755 // -verbose:[class/gc/jni]
2756 if (match_option(option, "-verbose", &tail)) {
2757 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2758 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2759 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2760 } else if (!strcmp(tail, ":gc")) {
2761 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2762 } else if (!strcmp(tail, ":jni")) {
2763 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 }
2767 // -da / -ea / -disableassertions / -enableassertions
2768 // These accept an optional class/package name separated by a colon, e.g.,
2769 // -da:java.lang.Thread.
2770 } else if (match_option(option, user_assertion_options, &tail, true)) {
2771 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2772 if (*tail == '\0') {
2773 JavaAssertions::setUserClassDefault(enable);
2774 } else {
2775 assert(*tail == ':', "bogus match by match_option()");
2776 JavaAssertions::addOption(tail + 1, enable);
2777 }
2778 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2779 } else if (match_option(option, system_assertion_options, &tail, false)) {
2780 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2781 JavaAssertions::setSystemClassDefault(enable);
2782 // -bootclasspath:
2783 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2784 jio_fprintf(defaultStream::output_stream(),
2785 "-Xbootclasspath is no longer a supported option.\n");
2786 return JNI_EINVAL;
2787 // -bootclasspath/a:
2788 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2789 Arguments::append_sysclasspath(tail);
2790 // -bootclasspath/p:
2791 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2792 jio_fprintf(defaultStream::output_stream(),
2793 "-Xbootclasspath/p is no longer a supported option.\n");
2794 return JNI_EINVAL;
2795 // -Xrun
2796 } else if (match_option(option, "-Xrun", &tail)) {
2797 if (tail != NULL) {
2798 const char* pos = strchr(tail, ':');
2799 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2800 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2801 name[len] = '\0';
2802
2803 char *options = NULL;
2804 if(pos != NULL) {
2805 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2806 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2807 }
2808 #if !INCLUDE_JVMTI
2809 if (strcmp(name, "jdwp") == 0) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Debugging agents are not supported in this VM\n");
2812 return JNI_ERR;
2813 }
2814 #endif // !INCLUDE_JVMTI
2815 add_init_library(name, options);
2816 }
2817 } else if (match_option(option, "--add-reads=", &tail)) {
2818 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2819 return JNI_ENOMEM;
2820 }
2821 } else if (match_option(option, "--add-exports=", &tail)) {
2822 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2823 return JNI_ENOMEM;
2824 }
2825 } else if (match_option(option, "--add-modules=", &tail)) {
2826 add_modules_value = tail;
2827 } else if (match_option(option, "--limit-modules=", &tail)) {
2828 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2829 return JNI_ENOMEM;
2830 }
2831 } else if (match_option(option, "--module-path=", &tail)) {
2832 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2833 return JNI_ENOMEM;
2834 }
2835 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2836 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2837 return JNI_ENOMEM;
2838 }
2839 } else if (match_option(option, "--patch-module=", &tail)) {
2840 // --patch-module=<module>=<file>(<pathsep><file>)*
2841 int res = process_patch_mod_option(tail, patch_mod_javabase);
2842 if (res != JNI_OK) {
2843 return res;
2844 }
2845 // -agentlib and -agentpath
2846 } else if (match_option(option, "-agentlib:", &tail) ||
2847 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2848 if(tail != NULL) {
2849 const char* pos = strchr(tail, '=');
2850 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2851 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2852 name[len] = '\0';
2853
2854 char *options = NULL;
2855 if(pos != NULL) {
2856 options = os::strdup_check_oom(pos + 1, mtArguments);
2857 }
2858 #if !INCLUDE_JVMTI
2859 if (valid_jdwp_agent(name, is_absolute_path)) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Debugging agents are not supported in this VM\n");
2862 return JNI_ERR;
2863 }
2864 #endif // !INCLUDE_JVMTI
2865 add_init_agent(name, options, is_absolute_path);
2866 }
2867 // -javaagent
2868 } else if (match_option(option, "-javaagent:", &tail)) {
2869 #if !INCLUDE_JVMTI
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Instrumentation agents are not supported in this VM\n");
2872 return JNI_ERR;
2873 #else
2874 if (tail != NULL) {
2875 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2876 add_init_agent("instrument", options, false);
2877 // java agents need module java.instrument
2878 if (!Arguments::append_to_addmods_property("java.instrument")) {
2879 return JNI_ENOMEM;
2880 }
2881 }
2882 #endif // !INCLUDE_JVMTI
2883 // -Xnoclassgc
2884 } else if (match_option(option, "-Xnoclassgc")) {
2885 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 // -Xconcgc
2889 } else if (match_option(option, "-Xconcgc")) {
2890 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 // -Xnoconcgc
2894 } else if (match_option(option, "-Xnoconcgc")) {
2895 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 // -Xbatch
2899 } else if (match_option(option, "-Xbatch")) {
2900 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 // -Xmn for compatibility with other JVM vendors
2904 } else if (match_option(option, "-Xmn", &tail)) {
2905 julong long_initial_young_size = 0;
2906 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2907 if (errcode != arg_in_range) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid initial young generation size: %s\n", option->optionString);
2910 describe_range_error(errcode);
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 // -Xms
2920 } else if (match_option(option, "-Xms", &tail)) {
2921 julong long_initial_heap_size = 0;
2922 // an initial heap size of 0 means automatically determine
2923 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2924 if (errcode != arg_in_range) {
2925 jio_fprintf(defaultStream::error_stream(),
2926 "Invalid initial heap size: %s\n", option->optionString);
2927 describe_range_error(errcode);
2928 return JNI_EINVAL;
2929 }
2930 set_min_heap_size((size_t)long_initial_heap_size);
2931 // Currently the minimum size and the initial heap sizes are the same.
2932 // Can be overridden with -XX:InitialHeapSize.
2933 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 // -Xmx
2937 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2938 julong long_max_heap_size = 0;
2939 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid maximum heap size: %s\n", option->optionString);
2943 describe_range_error(errcode);
2944 return JNI_EINVAL;
2945 }
2946 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949 // Xmaxf
2950 } else if (match_option(option, "-Xmaxf", &tail)) {
2951 char* err;
2952 int maxf = (int)(strtod(tail, &err) * 100);
2953 if (*err != '\0' || *tail == '\0') {
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Bad max heap free percentage size: %s\n",
2956 option->optionString);
2957 return JNI_EINVAL;
2958 } else {
2959 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 }
2963 // Xminf
2964 } else if (match_option(option, "-Xminf", &tail)) {
2965 char* err;
2966 int minf = (int)(strtod(tail, &err) * 100);
2967 if (*err != '\0' || *tail == '\0') {
2968 jio_fprintf(defaultStream::error_stream(),
2969 "Bad min heap free percentage size: %s\n",
2970 option->optionString);
2971 return JNI_EINVAL;
2972 } else {
2973 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2974 return JNI_EINVAL;
2975 }
2976 }
2977 // -Xss
2978 } else if (match_option(option, "-Xss", &tail)) {
2979 julong long_ThreadStackSize = 0;
2980 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2981 if (errcode != arg_in_range) {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Invalid thread stack size: %s\n", option->optionString);
2984 describe_range_error(errcode);
2985 return JNI_EINVAL;
2986 }
2987 // Internally track ThreadStackSize in units of 1024 bytes.
2988 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2989 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2993 } else if (match_option(option, "-Xoss", &tail) ||
2994 match_option(option, "-Xsqnopause") ||
2995 match_option(option, "-Xoptimize") ||
2996 match_option(option, "-Xboundthreads") ||
2997 match_option(option, "-Xusealtsigs")) {
2998 // All these options are deprecated in JDK 9 and will be removed in a future release
2999 char version[256];
3000 JDK_Version::jdk(9).to_string(version, sizeof(version));
3001 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3002 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3003 julong long_CodeCacheExpansionSize = 0;
3004 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3005 if (errcode != arg_in_range) {
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3008 os::vm_page_size()/K);
3009 return JNI_EINVAL;
3010 }
3011 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3015 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3016 julong long_ReservedCodeCacheSize = 0;
3017
3018 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3019 if (errcode != arg_in_range) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "Invalid maximum code cache size: %s.\n", option->optionString);
3022 return JNI_EINVAL;
3023 }
3024 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 // -XX:NonNMethodCodeHeapSize=
3028 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3029 julong long_NonNMethodCodeHeapSize = 0;
3030
3031 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3032 if (errcode != arg_in_range) {
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3035 return JNI_EINVAL;
3036 }
3037 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3038 return JNI_EINVAL;
3039 }
3040 // -XX:ProfiledCodeHeapSize=
3041 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3042 julong long_ProfiledCodeHeapSize = 0;
3043
3044 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3045 if (errcode != arg_in_range) {
3046 jio_fprintf(defaultStream::error_stream(),
3047 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3048 return JNI_EINVAL;
3049 }
3050 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 // -XX:NonProfiledCodeHeapSizee=
3054 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3055 julong long_NonProfiledCodeHeapSize = 0;
3056
3057 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3058 if (errcode != arg_in_range) {
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3061 return JNI_EINVAL;
3062 }
3063 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3064 return JNI_EINVAL;
3065 }
3066 // -green
3067 } else if (match_option(option, "-green")) {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "Green threads support not available\n");
3070 return JNI_EINVAL;
3071 // -native
3072 } else if (match_option(option, "-native")) {
3073 // HotSpot always uses native threads, ignore silently for compatibility
3074 // -Xrs
3075 } else if (match_option(option, "-Xrs")) {
3076 // Classic/EVM option, new functionality
3077 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 // -Xprof
3081 } else if (match_option(option, "-Xprof")) {
3082 #if INCLUDE_FPROF
3083 _has_profile = true;
3084 #else // INCLUDE_FPROF
3085 jio_fprintf(defaultStream::error_stream(),
3086 "Flat profiling is not supported in this VM.\n");
3087 return JNI_ERR;
3088 #endif // INCLUDE_FPROF
3089 // -Xconcurrentio
3090 } else if (match_option(option, "-Xconcurrentio")) {
3091 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3101 return JNI_EINVAL;
3102 }
3103 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3104 return JNI_EINVAL;
3105 }
3106
3107 // -Xinternalversion
3108 } else if (match_option(option, "-Xinternalversion")) {
3109 jio_fprintf(defaultStream::output_stream(), "%s\n",
3110 VM_Version::internal_vm_info_string());
3111 vm_exit(0);
3112 #ifndef PRODUCT
3113 // -Xprintflags
3114 } else if (match_option(option, "-Xprintflags")) {
3115 CommandLineFlags::printFlags(tty, false);
3116 vm_exit(0);
3117 #endif
3118 // -D
3119 } else if (match_option(option, "-D", &tail)) {
3120 const char* value;
3121 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3122 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3123 // abort if -Djava.endorsed.dirs is set
3124 jio_fprintf(defaultStream::output_stream(),
3125 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3126 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3127 return JNI_EINVAL;
3128 }
3129 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3130 *value != '\0' && strcmp(value, "\"\"") != 0) {
3131 // abort if -Djava.ext.dirs is set
3132 jio_fprintf(defaultStream::output_stream(),
3133 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3134 return JNI_EINVAL;
3135 }
3136 // Check for module related properties. They must be set using the modules
3137 // options. For example: use "--add-modules=java.sql", not
3138 // "-Djdk.module.addmods=java.sql"
3139 if (is_internal_module_property(option->optionString + 2)) {
3140 needs_module_property_warning = true;
3141 continue;
3142 }
3143
3144 if (!add_property(tail)) {
3145 return JNI_ENOMEM;
3146 }
3147 // Out of the box management support
3148 if (match_option(option, "-Dcom.sun.management", &tail)) {
3149 #if INCLUDE_MANAGEMENT
3150 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 // management agent in module java.management
3154 if (!Arguments::append_to_addmods_property("java.management")) {
3155 return JNI_ENOMEM;
3156 }
3157 #else
3158 jio_fprintf(defaultStream::output_stream(),
3159 "-Dcom.sun.management is not supported in this VM.\n");
3160 return JNI_ERR;
3161 #endif
3162 }
3163 // -Xint
3164 } else if (match_option(option, "-Xint")) {
3165 set_mode_flags(_int);
3166 // -Xmixed
3167 } else if (match_option(option, "-Xmixed")) {
3168 set_mode_flags(_mixed);
3169 // -Xcomp
3170 } else if (match_option(option, "-Xcomp")) {
3171 // for testing the compiler; turn off all flags that inhibit compilation
3172 set_mode_flags(_comp);
3173 // -Xshare:dump
3174 } else if (match_option(option, "-Xshare:dump")) {
3175 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3176 return JNI_EINVAL;
3177 }
3178 set_mode_flags(_int); // Prevent compilation, which creates objects
3179 // -Xshare:on
3180 } else if (match_option(option, "-Xshare:on")) {
3181 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 // -Xshare:auto
3188 } else if (match_option(option, "-Xshare:auto")) {
3189 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 // -Xshare:off
3196 } else if (match_option(option, "-Xshare:off")) {
3197 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 // -Xverify
3204 } else if (match_option(option, "-Xverify", &tail)) {
3205 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3206 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 } else if (strcmp(tail, ":remote") == 0) {
3213 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3217 return JNI_EINVAL;
3218 }
3219 } else if (strcmp(tail, ":none") == 0) {
3220 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3221 return JNI_EINVAL;
3222 }
3223 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3227 return JNI_EINVAL;
3228 }
3229 // -Xdebug
3230 } else if (match_option(option, "-Xdebug")) {
3231 // note this flag has been used, then ignore
3232 set_xdebug_mode(true);
3233 // -Xnoagent
3234 } else if (match_option(option, "-Xnoagent")) {
3235 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3236 } else if (match_option(option, "-Xloggc:", &tail)) {
3237 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3238 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3239 _gc_log_filename = os::strdup_check_oom(tail);
3240 } else if (match_option(option, "-Xlog", &tail)) {
3241 bool ret = false;
3242 if (strcmp(tail, ":help") == 0) {
3243 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3244 vm_exit(0);
3245 } else if (strcmp(tail, ":disable") == 0) {
3246 LogConfiguration::disable_logging();
3247 ret = true;
3248 } else if (*tail == '\0') {
3249 ret = LogConfiguration::parse_command_line_arguments();
3250 assert(ret, "-Xlog without arguments should never fail to parse");
3251 } else if (*tail == ':') {
3252 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3253 }
3254 if (ret == false) {
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Invalid -Xlog option '-Xlog%s'\n",
3257 tail);
3258 return JNI_EINVAL;
3259 }
3260 // JNI hooks
3261 } else if (match_option(option, "-Xcheck", &tail)) {
3262 if (!strcmp(tail, ":jni")) {
3263 #if !INCLUDE_JNI_CHECK
3264 warning("JNI CHECKING is not supported in this VM");
3265 #else
3266 CheckJNICalls = true;
3267 #endif // INCLUDE_JNI_CHECK
3268 } else if (is_bad_option(option, args->ignoreUnrecognized,
3269 "check")) {
3270 return JNI_EINVAL;
3271 }
3272 } else if (match_option(option, "vfprintf")) {
3273 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3274 } else if (match_option(option, "exit")) {
3275 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3276 } else if (match_option(option, "abort")) {
3277 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3278 // -XX:+AggressiveHeap
3279 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3280 jint result = set_aggressive_heap_flags();
3281 if (result != JNI_OK) {
3282 return result;
3283 }
3284 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3285 // and the last option wins.
3286 } else if (match_option(option, "-XX:+NeverTenure")) {
3287 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3288 return JNI_EINVAL;
3289 }
3290 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3294 return JNI_EINVAL;
3295 }
3296 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3297 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3298 return JNI_EINVAL;
3299 }
3300 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3307 uintx max_tenuring_thresh = 0;
3308 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3311 return JNI_EINVAL;
3312 }
3313
3314 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3315 return JNI_EINVAL;
3316 }
3317
3318 if (MaxTenuringThreshold == 0) {
3319 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 } else {
3326 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3327 return JNI_EINVAL;
3328 }
3329 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3330 return JNI_EINVAL;
3331 }
3332 }
3333 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3334 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3335 return JNI_EINVAL;
3336 }
3337 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3338 return JNI_EINVAL;
3339 }
3340 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3341 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3342 return JNI_EINVAL;
3343 }
3344 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3345 return JNI_EINVAL;
3346 }
3347 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3348 #if defined(DTRACE_ENABLED)
3349 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3350 return JNI_EINVAL;
3351 }
3352 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3356 return JNI_EINVAL;
3357 }
3358 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3359 return JNI_EINVAL;
3360 }
3361 #else // defined(DTRACE_ENABLED)
3362 jio_fprintf(defaultStream::error_stream(),
3363 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3364 return JNI_EINVAL;
3365 #endif // defined(DTRACE_ENABLED)
3366 #ifdef ASSERT
3367 } else if (match_option(option, "-XX:+FullGCALot")) {
3368 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3369 return JNI_EINVAL;
3370 }
3371 // disable scavenge before parallel mark-compact
3372 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3373 return JNI_EINVAL;
3374 }
3375 #endif
3376 #if !INCLUDE_MANAGEMENT
3377 } else if (match_option(option, "-XX:+ManagementServer")) {
3378 jio_fprintf(defaultStream::error_stream(),
3379 "ManagementServer is not supported in this VM.\n");
3380 return JNI_ERR;
3381 #endif // INCLUDE_MANAGEMENT
3382 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3383 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3384 // already been handled
3385 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3386 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3387 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3388 return JNI_EINVAL;
3389 }
3390 }
3391 // Unknown option
3392 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3393 return JNI_ERR;
3394 }
3395 }
3396
3397 // PrintSharedArchiveAndExit will turn on
3398 // -Xshare:on
3399 // -Xlog:class+path=info
3400 if (PrintSharedArchiveAndExit) {
3401 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3402 return JNI_EINVAL;
3403 }
3404 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3408 }
3409
3410 // Change the default value for flags which have different default values
3411 // when working with older JDKs.
3412 #ifdef LINUX
3413 if (JDK_Version::current().compare_major(6) <= 0 &&
3414 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3415 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3416 }
3417 #endif // LINUX
3418 fix_appclasspath();
3419 return JNI_OK;
3420 }
3421
3422 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3423 // For java.base check for duplicate --patch-module options being specified on the command line.
3424 // This check is only required for java.base, all other duplicate module specifications
3425 // will be checked during module system initialization. The module system initialization
3426 // will throw an ExceptionInInitializerError if this situation occurs.
3427 if (strcmp(module_name, "java.base") == 0) {
3428 if (*patch_mod_javabase) {
3429 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3430 } else {
3431 *patch_mod_javabase = true;
3432 }
3433 }
3434
3435 // Create GrowableArray lazily, only if --patch-module has been specified
3436 if (_patch_mod_prefix == NULL) {
3437 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3438 }
3439
3440 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3441 }
3442
3443 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3444 //
3445 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3446 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3447 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3448 // path is treated as the current directory.
3449 //
3450 // This causes problems with CDS, which requires that all directories specified in the classpath
3451 // must be empty. In most cases, applications do NOT want to load classes from the current
3452 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3453 // scripts compatible with CDS.
3454 void Arguments::fix_appclasspath() {
3455 if (IgnoreEmptyClassPaths) {
3456 const char separator = *os::path_separator();
3457 const char* src = _java_class_path->value();
3458
3459 // skip over all the leading empty paths
3460 while (*src == separator) {
3461 src ++;
3462 }
3463
3464 char* copy = os::strdup_check_oom(src, mtArguments);
3465
3466 // trim all trailing empty paths
3467 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3468 *tail = '\0';
3469 }
3470
3471 char from[3] = {separator, separator, '\0'};
3472 char to [2] = {separator, '\0'};
3473 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3474 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3475 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3476 }
3477
3478 _java_class_path->set_writeable_value(copy);
3479 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3480 }
3481 }
3482
3483 static bool has_jar_files(const char* directory) {
3484 DIR* dir = os::opendir(directory);
3485 if (dir == NULL) return false;
3486
3487 struct dirent *entry;
3488 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3489 bool hasJarFile = false;
3490 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3491 const char* name = entry->d_name;
3492 const char* ext = name + strlen(name) - 4;
3493 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3494 }
3495 FREE_C_HEAP_ARRAY(char, dbuf);
3496 os::closedir(dir);
3497 return hasJarFile ;
3498 }
3499
3500 static int check_non_empty_dirs(const char* path) {
3501 const char separator = *os::path_separator();
3502 const char* const end = path + strlen(path);
3503 int nonEmptyDirs = 0;
3504 while (path < end) {
3505 const char* tmp_end = strchr(path, separator);
3506 if (tmp_end == NULL) {
3507 if (has_jar_files(path)) {
3508 nonEmptyDirs++;
3509 jio_fprintf(defaultStream::output_stream(),
3510 "Non-empty directory: %s\n", path);
3511 }
3512 path = end;
3513 } else {
3514 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3515 memcpy(dirpath, path, tmp_end - path);
3516 dirpath[tmp_end - path] = '\0';
3517 if (has_jar_files(dirpath)) {
3518 nonEmptyDirs++;
3519 jio_fprintf(defaultStream::output_stream(),
3520 "Non-empty directory: %s\n", dirpath);
3521 }
3522 FREE_C_HEAP_ARRAY(char, dirpath);
3523 path = tmp_end + 1;
3524 }
3525 }
3526 return nonEmptyDirs;
3527 }
3528
3529 jint Arguments::finalize_vm_init_args() {
3530 // check if the default lib/endorsed directory exists; if so, error
3531 char path[JVM_MAXPATHLEN];
3532 const char* fileSep = os::file_separator();
3533 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3534
3535 if (CheckEndorsedAndExtDirs) {
3536 int nonEmptyDirs = 0;
3537 // check endorsed directory
3538 nonEmptyDirs += check_non_empty_dirs(path);
3539 // check the extension directories
3540 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3541 if (nonEmptyDirs > 0) {
3542 return JNI_ERR;
3543 }
3544 }
3545
3546 DIR* dir = os::opendir(path);
3547 if (dir != NULL) {
3548 jio_fprintf(defaultStream::output_stream(),
3549 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3550 "in modular form will be supported via the concept of upgradeable modules.\n");
3551 os::closedir(dir);
3552 return JNI_ERR;
3553 }
3554
3555 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3556 dir = os::opendir(path);
3557 if (dir != NULL) {
3558 jio_fprintf(defaultStream::output_stream(),
3559 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3560 "Use -classpath instead.\n.");
3561 os::closedir(dir);
3562 return JNI_ERR;
3563 }
3564
3565 // Append the value of the last --add-modules option specified on the command line.
3566 // This needs to be done here, to prevent overwriting possible values written
3567 // to the jdk.module.addmods property by -javaagent and other options.
3568 if (add_modules_value != NULL) {
3569 if (!append_to_addmods_property(add_modules_value)) {
3570 return JNI_ENOMEM;
3571 }
3572 }
3573
3574 // This must be done after all arguments have been processed.
3575 // java_compiler() true means set to "NONE" or empty.
3576 if (java_compiler() && !xdebug_mode()) {
3577 // For backwards compatibility, we switch to interpreted mode if
3578 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3579 // not specified.
3580 set_mode_flags(_int);
3581 }
3582
3583 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3584 // but like -Xint, leave compilation thresholds unaffected.
3585 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3586 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3587 set_mode_flags(_int);
3588 }
3589
3590 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3591 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3592 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3593 }
3594
3595 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3596 // Don't degrade server performance for footprint
3597 if (FLAG_IS_DEFAULT(UseLargePages) &&
3598 MaxHeapSize < LargePageHeapSizeThreshold) {
3599 // No need for large granularity pages w/small heaps.
3600 // Note that large pages are enabled/disabled for both the
3601 // Java heap and the code cache.
3602 FLAG_SET_DEFAULT(UseLargePages, false);
3603 }
3604
3605 #elif defined(COMPILER2)
3606 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3607 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3608 }
3609 #endif
3610
3611 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3612 UNSUPPORTED_OPTION(ProfileInterpreter);
3613 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3614 #endif
3615
3616 #ifndef TIERED
3617 // Tiered compilation is undefined.
3618 UNSUPPORTED_OPTION(TieredCompilation);
3619 #endif
3620
3621 #if INCLUDE_JVMCI
3622 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3623 return JNI_ENOMEM;
3624 }
3625 #endif
3626
3627 // If we are running in a headless jre, force java.awt.headless property
3628 // to be true unless the property has already been set.
3629 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3630 if (os::is_headless_jre()) {
3631 const char* headless = Arguments::get_property("java.awt.headless");
3632 if (headless == NULL) {
3633 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3634 if (headless_env == NULL) {
3635 if (!add_property("java.awt.headless=true")) {
3636 return JNI_ENOMEM;
3637 }
3638 } else {
3639 char buffer[256];
3640 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3641 if (!add_property(buffer)) {
3642 return JNI_ENOMEM;
3643 }
3644 }
3645 }
3646 }
3647
3648 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3649 // CMS can only be used with ParNew
3650 FLAG_SET_ERGO(bool, UseParNewGC, true);
3651 }
3652
3653 if (!check_vm_args_consistency()) {
3654 return JNI_ERR;
3655 }
3656
3657 return JNI_OK;
3658 }
3659
3660 // Helper class for controlling the lifetime of JavaVMInitArgs
3661 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3662 // deleted on the destruction of the ScopedVMInitArgs object.
3663 class ScopedVMInitArgs : public StackObj {
3664 private:
3665 JavaVMInitArgs _args;
3666 char* _container_name;
3667 bool _is_set;
3668 char* _vm_options_file_arg;
3669
3670 public:
3671 ScopedVMInitArgs(const char *container_name) {
3672 _args.version = JNI_VERSION_1_2;
3673 _args.nOptions = 0;
3674 _args.options = NULL;
3675 _args.ignoreUnrecognized = false;
3676 _container_name = (char *)container_name;
3677 _is_set = false;
3678 _vm_options_file_arg = NULL;
3679 }
3680
3681 // Populates the JavaVMInitArgs object represented by this
3682 // ScopedVMInitArgs object with the arguments in options. The
3683 // allocated memory is deleted by the destructor. If this method
3684 // returns anything other than JNI_OK, then this object is in a
3685 // partially constructed state, and should be abandoned.
3686 jint set_args(GrowableArray<JavaVMOption>* options) {
3687 _is_set = true;
3688 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3689 JavaVMOption, options->length(), mtArguments);
3690 if (options_arr == NULL) {
3691 return JNI_ENOMEM;
3692 }
3693 _args.options = options_arr;
3694
3695 for (int i = 0; i < options->length(); i++) {
3696 options_arr[i] = options->at(i);
3697 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3698 if (options_arr[i].optionString == NULL) {
3699 // Rely on the destructor to do cleanup.
3700 _args.nOptions = i;
3701 return JNI_ENOMEM;
3702 }
3703 }
3704
3705 _args.nOptions = options->length();
3706 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3707 return JNI_OK;
3708 }
3709
3710 JavaVMInitArgs* get() { return &_args; }
3711 char* container_name() { return _container_name; }
3712 bool is_set() { return _is_set; }
3713 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3714 char* vm_options_file_arg() { return _vm_options_file_arg; }
3715
3716 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3717 if (_vm_options_file_arg != NULL) {
3718 os::free(_vm_options_file_arg);
3719 }
3720 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3721 }
3722
3723 ~ScopedVMInitArgs() {
3724 if (_vm_options_file_arg != NULL) {
3725 os::free(_vm_options_file_arg);
3726 }
3727 if (_args.options == NULL) return;
3728 for (int i = 0; i < _args.nOptions; i++) {
3729 os::free(_args.options[i].optionString);
3730 }
3731 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3732 }
3733
3734 // Insert options into this option list, to replace option at
3735 // vm_options_file_pos (-XX:VMOptionsFile)
3736 jint insert(const JavaVMInitArgs* args,
3737 const JavaVMInitArgs* args_to_insert,
3738 const int vm_options_file_pos) {
3739 assert(_args.options == NULL, "shouldn't be set yet");
3740 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3741 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3742
3743 int length = args->nOptions + args_to_insert->nOptions - 1;
3744 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3745 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3746 for (int i = 0; i < args->nOptions; i++) {
3747 if (i == vm_options_file_pos) {
3748 // insert the new options starting at the same place as the
3749 // -XX:VMOptionsFile option
3750 for (int j = 0; j < args_to_insert->nOptions; j++) {
3751 options->push(args_to_insert->options[j]);
3752 }
3753 } else {
3754 options->push(args->options[i]);
3755 }
3756 }
3757 // make into options array
3758 jint result = set_args(options);
3759 delete options;
3760 return result;
3761 }
3762 };
3763
3764 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3765 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3766 }
3767
3768 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3769 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3770 }
3771
3772 jint Arguments::parse_options_environment_variable(const char* name,
3773 ScopedVMInitArgs* vm_args) {
3774 char *buffer = ::getenv(name);
3775
3776 // Don't check this environment variable if user has special privileges
3777 // (e.g. unix su command).
3778 if (buffer == NULL || os::have_special_privileges()) {
3779 return JNI_OK;
3780 }
3781
3782 if ((buffer = os::strdup(buffer)) == NULL) {
3783 return JNI_ENOMEM;
3784 }
3785
3786 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3787
3788 os::free(buffer);
3789 return retcode;
3790 }
3791
3792 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3793 // read file into buffer
3794 int fd = ::open(file_name, O_RDONLY);
3795 if (fd < 0) {
3796 jio_fprintf(defaultStream::error_stream(),
3797 "Could not open options file '%s'\n",
3798 file_name);
3799 return JNI_ERR;
3800 }
3801
3802 struct stat stbuf;
3803 int retcode = os::stat(file_name, &stbuf);
3804 if (retcode != 0) {
3805 jio_fprintf(defaultStream::error_stream(),
3806 "Could not stat options file '%s'\n",
3807 file_name);
3808 os::close(fd);
3809 return JNI_ERR;
3810 }
3811
3812 if (stbuf.st_size == 0) {
3813 // tell caller there is no option data and that is ok
3814 os::close(fd);
3815 return JNI_OK;
3816 }
3817
3818 // '+ 1' for NULL termination even with max bytes
3819 size_t bytes_alloc = stbuf.st_size + 1;
3820
3821 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3822 if (NULL == buf) {
3823 jio_fprintf(defaultStream::error_stream(),
3824 "Could not allocate read buffer for options file parse\n");
3825 os::close(fd);
3826 return JNI_ENOMEM;
3827 }
3828
3829 memset(buf, 0, bytes_alloc);
3830
3831 // Fill buffer
3832 // Use ::read() instead of os::read because os::read()
3833 // might do a thread state transition
3834 // and it is too early for that here
3835
3836 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3837 os::close(fd);
3838 if (bytes_read < 0) {
3839 FREE_C_HEAP_ARRAY(char, buf);
3840 jio_fprintf(defaultStream::error_stream(),
3841 "Could not read options file '%s'\n", file_name);
3842 return JNI_ERR;
3843 }
3844
3845 if (bytes_read == 0) {
3846 // tell caller there is no option data and that is ok
3847 FREE_C_HEAP_ARRAY(char, buf);
3848 return JNI_OK;
3849 }
3850
3851 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3852
3853 FREE_C_HEAP_ARRAY(char, buf);
3854 return retcode;
3855 }
3856
3857 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3858 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3859
3860 // some pointers to help with parsing
3861 char *buffer_end = buffer + buf_len;
3862 char *opt_hd = buffer;
3863 char *wrt = buffer;
3864 char *rd = buffer;
3865
3866 // parse all options
3867 while (rd < buffer_end) {
3868 // skip leading white space from the input string
3869 while (rd < buffer_end && isspace(*rd)) {
3870 rd++;
3871 }
3872
3873 if (rd >= buffer_end) {
3874 break;
3875 }
3876
3877 // Remember this is where we found the head of the token.
3878 opt_hd = wrt;
3879
3880 // Tokens are strings of non white space characters separated
3881 // by one or more white spaces.
3882 while (rd < buffer_end && !isspace(*rd)) {
3883 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3884 int quote = *rd; // matching quote to look for
3885 rd++; // don't copy open quote
3886 while (rd < buffer_end && *rd != quote) {
3887 // include everything (even spaces)
3888 // up until the close quote
3889 *wrt++ = *rd++; // copy to option string
3890 }
3891
3892 if (rd < buffer_end) {
3893 rd++; // don't copy close quote
3894 } else {
3895 // did not see closing quote
3896 jio_fprintf(defaultStream::error_stream(),
3897 "Unmatched quote in %s\n", name);
3898 delete options;
3899 return JNI_ERR;
3900 }
3901 } else {
3902 *wrt++ = *rd++; // copy to option string
3903 }
3904 }
3905
3906 // steal a white space character and set it to NULL
3907 *wrt++ = '\0';
3908 // We now have a complete token
3909
3910 JavaVMOption option;
3911 option.optionString = opt_hd;
3912 option.extraInfo = NULL;
3913
3914 options->append(option); // Fill in option
3915
3916 rd++; // Advance to next character
3917 }
3918
3919 // Fill out JavaVMInitArgs structure.
3920 jint status = vm_args->set_args(options);
3921
3922 delete options;
3923 return status;
3924 }
3925
3926 void Arguments::set_shared_spaces_flags() {
3927 if (DumpSharedSpaces) {
3928 if (Arguments::get_patch_mod_prefix() != NULL) {
3929 vm_exit_during_initialization(
3930 "Cannot use the following option when dumping the shared archive: --patch-module");
3931 }
3932
3933 if (RequireSharedSpaces) {
3934 warning("Cannot dump shared archive while using shared archive");
3935 }
3936 UseSharedSpaces = false;
3937 #ifdef _LP64
3938 if (!UseCompressedOops || !UseCompressedClassPointers) {
3939 vm_exit_during_initialization(
3940 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3941 }
3942 } else {
3943 if (!UseCompressedOops || !UseCompressedClassPointers) {
3944 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3945 }
3946 #endif
3947 }
3948 }
3949
3950 // Sharing support
3951 // Construct the path to the archive
3952 static char* get_shared_archive_path() {
3953 char *shared_archive_path;
3954 if (SharedArchiveFile == NULL) {
3955 char jvm_path[JVM_MAXPATHLEN];
3956 os::jvm_path(jvm_path, sizeof(jvm_path));
3957 char *end = strrchr(jvm_path, *os::file_separator());
3958 if (end != NULL) *end = '\0';
3959 size_t jvm_path_len = strlen(jvm_path);
3960 size_t file_sep_len = strlen(os::file_separator());
3961 const size_t len = jvm_path_len + file_sep_len + 20;
3962 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3963 if (shared_archive_path != NULL) {
3964 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3965 jvm_path, os::file_separator());
3966 }
3967 } else {
3968 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3969 }
3970 return shared_archive_path;
3971 }
3972
3973 #ifndef PRODUCT
3974 // Determine whether LogVMOutput should be implicitly turned on.
3975 static bool use_vm_log() {
3976 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3977 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3978 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3979 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3980 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3981 return true;
3982 }
3983
3984 #ifdef COMPILER1
3985 if (PrintC1Statistics) {
3986 return true;
3987 }
3988 #endif // COMPILER1
3989
3990 #ifdef COMPILER2
3991 if (PrintOptoAssembly || PrintOptoStatistics) {
3992 return true;
3993 }
3994 #endif // COMPILER2
3995
3996 return false;
3997 }
3998
3999 #endif // PRODUCT
4000
4001 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4002 for (int index = 0; index < args->nOptions; index++) {
4003 const JavaVMOption* option = args->options + index;
4004 const char* tail;
4005 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4006 return true;
4007 }
4008 }
4009 return false;
4010 }
4011
4012 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4013 const char* vm_options_file,
4014 const int vm_options_file_pos,
4015 ScopedVMInitArgs* vm_options_file_args,
4016 ScopedVMInitArgs* args_out) {
4017 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4018 if (code != JNI_OK) {
4019 return code;
4020 }
4021
4022 if (vm_options_file_args->get()->nOptions < 1) {
4023 return JNI_OK;
4024 }
4025
4026 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4027 jio_fprintf(defaultStream::error_stream(),
4028 "A VM options file may not refer to a VM options file. "
4029 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4030 "options file '%s' in options container '%s' is an error.\n",
4031 vm_options_file_args->vm_options_file_arg(),
4032 vm_options_file_args->container_name());
4033 return JNI_EINVAL;
4034 }
4035
4036 return args_out->insert(args, vm_options_file_args->get(),
4037 vm_options_file_pos);
4038 }
4039
4040 // Expand -XX:VMOptionsFile found in args_in as needed.
4041 // mod_args and args_out parameters may return values as needed.
4042 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4043 ScopedVMInitArgs* mod_args,
4044 JavaVMInitArgs** args_out) {
4045 jint code = match_special_option_and_act(args_in, mod_args);
4046 if (code != JNI_OK) {
4047 return code;
4048 }
4049
4050 if (mod_args->is_set()) {
4051 // args_in contains -XX:VMOptionsFile and mod_args contains the
4052 // original options from args_in along with the options expanded
4053 // from the VMOptionsFile. Return a short-hand to the caller.
4054 *args_out = mod_args->get();
4055 } else {
4056 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4057 }
4058 return JNI_OK;
4059 }
4060
4061 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4062 ScopedVMInitArgs* args_out) {
4063 // Remaining part of option string
4064 const char* tail;
4065 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4066
4067 for (int index = 0; index < args->nOptions; index++) {
4068 const JavaVMOption* option = args->options + index;
4069 if (ArgumentsExt::process_options(option)) {
4070 continue;
4071 }
4072 if (match_option(option, "-XX:Flags=", &tail)) {
4073 Arguments::set_jvm_flags_file(tail);
4074 continue;
4075 }
4076 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4077 if (vm_options_file_args.found_vm_options_file_arg()) {
4078 jio_fprintf(defaultStream::error_stream(),
4079 "The option '%s' is already specified in the options "
4080 "container '%s' so the specification of '%s' in the "
4081 "same options container is an error.\n",
4082 vm_options_file_args.vm_options_file_arg(),
4083 vm_options_file_args.container_name(),
4084 option->optionString);
4085 return JNI_EINVAL;
4086 }
4087 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4088 // If there's a VMOptionsFile, parse that
4089 jint code = insert_vm_options_file(args, tail, index,
4090 &vm_options_file_args, args_out);
4091 if (code != JNI_OK) {
4092 return code;
4093 }
4094 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4095 if (args_out->is_set()) {
4096 // The VMOptions file inserted some options so switch 'args'
4097 // to the new set of options, and continue processing which
4098 // preserves "last option wins" semantics.
4099 args = args_out->get();
4100 // The first option from the VMOptionsFile replaces the
4101 // current option. So we back track to process the
4102 // replacement option.
4103 index--;
4104 }
4105 continue;
4106 }
4107 if (match_option(option, "-XX:+PrintVMOptions")) {
4108 PrintVMOptions = true;
4109 continue;
4110 }
4111 if (match_option(option, "-XX:-PrintVMOptions")) {
4112 PrintVMOptions = false;
4113 continue;
4114 }
4115 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4116 IgnoreUnrecognizedVMOptions = true;
4117 continue;
4118 }
4119 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4120 IgnoreUnrecognizedVMOptions = false;
4121 continue;
4122 }
4123 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4124 CommandLineFlags::printFlags(tty, false);
4125 vm_exit(0);
4126 }
4127 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4128 #if INCLUDE_NMT
4129 // The launcher did not setup nmt environment variable properly.
4130 if (!MemTracker::check_launcher_nmt_support(tail)) {
4131 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4132 }
4133
4134 // Verify if nmt option is valid.
4135 if (MemTracker::verify_nmt_option()) {
4136 // Late initialization, still in single-threaded mode.
4137 if (MemTracker::tracking_level() >= NMT_summary) {
4138 MemTracker::init();
4139 }
4140 } else {
4141 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4142 }
4143 continue;
4144 #else
4145 jio_fprintf(defaultStream::error_stream(),
4146 "Native Memory Tracking is not supported in this VM\n");
4147 return JNI_ERR;
4148 #endif
4149 }
4150
4151 #ifndef PRODUCT
4152 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4153 CommandLineFlags::printFlags(tty, true);
4154 vm_exit(0);
4155 }
4156 #endif
4157 }
4158 return JNI_OK;
4159 }
4160
4161 static void print_options(const JavaVMInitArgs *args) {
4162 const char* tail;
4163 for (int index = 0; index < args->nOptions; index++) {
4164 const JavaVMOption *option = args->options + index;
4165 if (match_option(option, "-XX:", &tail)) {
4166 logOption(tail);
4167 }
4168 }
4169 }
4170
4171 bool Arguments::handle_deprecated_print_gc_flags() {
4172 if (PrintGC) {
4173 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4174 }
4175 if (PrintGCDetails) {
4176 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4177 }
4178
4179 if (_gc_log_filename != NULL) {
4180 // -Xloggc was used to specify a filename
4181 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4182
4183 LogTarget(Error, logging) target;
4184 LogStreamCHeap errstream(target);
4185 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4186 } else if (PrintGC || PrintGCDetails) {
4187 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4188 }
4189 return true;
4190 }
4191
4192 // Parse entry point called from JNI_CreateJavaVM
4193
4194 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4195 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4196
4197 // Initialize ranges, constraints and writeables
4198 CommandLineFlagRangeList::init();
4199 CommandLineFlagConstraintList::init();
4200 CommandLineFlagWriteableList::init();
4201
4202 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4203 const char* hotspotrc = ".hotspotrc";
4204 bool settings_file_specified = false;
4205 bool needs_hotspotrc_warning = false;
4206 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4207 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4208
4209 // Pointers to current working set of containers
4210 JavaVMInitArgs* cur_cmd_args;
4211 JavaVMInitArgs* cur_java_options_args;
4212 JavaVMInitArgs* cur_java_tool_options_args;
4213
4214 // Containers for modified/expanded options
4215 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4216 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4217 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4218
4219
4220 jint code =
4221 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4222 if (code != JNI_OK) {
4223 return code;
4224 }
4225
4226 code = parse_java_options_environment_variable(&initial_java_options_args);
4227 if (code != JNI_OK) {
4228 return code;
4229 }
4230
4231 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4232 &mod_java_tool_options_args,
4233 &cur_java_tool_options_args);
4234 if (code != JNI_OK) {
4235 return code;
4236 }
4237
4238 code = expand_vm_options_as_needed(initial_cmd_args,
4239 &mod_cmd_args,
4240 &cur_cmd_args);
4241 if (code != JNI_OK) {
4242 return code;
4243 }
4244
4245 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4246 &mod_java_options_args,
4247 &cur_java_options_args);
4248 if (code != JNI_OK) {
4249 return code;
4250 }
4251
4252 const char* flags_file = Arguments::get_jvm_flags_file();
4253 settings_file_specified = (flags_file != NULL);
4254
4255 if (IgnoreUnrecognizedVMOptions) {
4256 cur_cmd_args->ignoreUnrecognized = true;
4257 cur_java_tool_options_args->ignoreUnrecognized = true;
4258 cur_java_options_args->ignoreUnrecognized = true;
4259 }
4260
4261 // Parse specified settings file
4262 if (settings_file_specified) {
4263 if (!process_settings_file(flags_file, true,
4264 cur_cmd_args->ignoreUnrecognized)) {
4265 return JNI_EINVAL;
4266 }
4267 } else {
4268 #ifdef ASSERT
4269 // Parse default .hotspotrc settings file
4270 if (!process_settings_file(".hotspotrc", false,
4271 cur_cmd_args->ignoreUnrecognized)) {
4272 return JNI_EINVAL;
4273 }
4274 #else
4275 struct stat buf;
4276 if (os::stat(hotspotrc, &buf) == 0) {
4277 needs_hotspotrc_warning = true;
4278 }
4279 #endif
4280 }
4281
4282 if (PrintVMOptions) {
4283 print_options(cur_java_tool_options_args);
4284 print_options(cur_cmd_args);
4285 print_options(cur_java_options_args);
4286 }
4287
4288 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4289 jint result = parse_vm_init_args(cur_java_tool_options_args,
4290 cur_java_options_args,
4291 cur_cmd_args);
4292
4293 if (result != JNI_OK) {
4294 return result;
4295 }
4296
4297 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4298 SharedArchivePath = get_shared_archive_path();
4299 if (SharedArchivePath == NULL) {
4300 return JNI_ENOMEM;
4301 }
4302
4303 // Set up VerifySharedSpaces
4304 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4305 VerifySharedSpaces = true;
4306 }
4307
4308 // Delay warning until here so that we've had a chance to process
4309 // the -XX:-PrintWarnings flag
4310 if (needs_hotspotrc_warning) {
4311 warning("%s file is present but has been ignored. "
4312 "Run with -XX:Flags=%s to load the file.",
4313 hotspotrc, hotspotrc);
4314 }
4315
4316 if (needs_module_property_warning) {
4317 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4318 " names that are reserved for internal use.");
4319 }
4320
4321 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4322 UNSUPPORTED_OPTION(UseLargePages);
4323 #endif
4324
4325 ArgumentsExt::report_unsupported_options();
4326
4327 #ifndef PRODUCT
4328 if (TraceBytecodesAt != 0) {
4329 TraceBytecodes = true;
4330 }
4331 if (CountCompiledCalls) {
4332 if (UseCounterDecay) {
4333 warning("UseCounterDecay disabled because CountCalls is set");
4334 UseCounterDecay = false;
4335 }
4336 }
4337 #endif // PRODUCT
4338
4339 if (ScavengeRootsInCode == 0) {
4340 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4341 warning("Forcing ScavengeRootsInCode non-zero");
4342 }
4343 ScavengeRootsInCode = 1;
4344 }
4345
4346 if (!handle_deprecated_print_gc_flags()) {
4347 return JNI_EINVAL;
4348 }
4349
4350 // Set object alignment values.
4351 set_object_alignment();
4352
4353 #if !INCLUDE_CDS
4354 if (DumpSharedSpaces || RequireSharedSpaces) {
4355 jio_fprintf(defaultStream::error_stream(),
4356 "Shared spaces are not supported in this VM\n");
4357 return JNI_ERR;
4358 }
4359 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4360 warning("Shared spaces are not supported in this VM");
4361 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4362 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4363 }
4364 no_shared_spaces("CDS Disabled");
4365 #endif // INCLUDE_CDS
4366
4367 return JNI_OK;
4368 }
4369
4370 jint Arguments::apply_ergo() {
4371
4372 // Set flags based on ergonomics.
4373 set_ergonomics_flags();
4374
4375 set_shared_spaces_flags();
4376
4377 // Check the GC selections again.
4378 if (!check_gc_consistency()) {
4379 return JNI_EINVAL;
4380 }
4381
4382 if (TieredCompilation) {
4383 set_tiered_flags();
4384 } else {
4385 int max_compilation_policy_choice = 1;
4386 #ifdef COMPILER2
4387 max_compilation_policy_choice = 2;
4388 #endif
4389 // Check if the policy is valid.
4390 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4391 vm_exit_during_initialization(
4392 "Incompatible compilation policy selected", NULL);
4393 }
4394 // Scale CompileThreshold
4395 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4396 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4397 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4398 }
4399 }
4400
4401 #ifdef COMPILER2
4402 #ifndef PRODUCT
4403 if (PrintIdealGraphLevel > 0) {
4404 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4405 }
4406 #endif
4407 #endif
4408
4409 // Set heap size based on available physical memory
4410 set_heap_size();
4411
4412 ArgumentsExt::set_gc_specific_flags();
4413
4414 // Initialize Metaspace flags and alignments
4415 Metaspace::ergo_initialize();
4416
4417 // Set bytecode rewriting flags
4418 set_bytecode_flags();
4419
4420 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4421 jint code = set_aggressive_opts_flags();
4422 if (code != JNI_OK) {
4423 return code;
4424 }
4425
4426 // Turn off biased locking for locking debug mode flags,
4427 // which are subtly different from each other but neither works with
4428 // biased locking
4429 if (UseHeavyMonitors
4430 #ifdef COMPILER1
4431 || !UseFastLocking
4432 #endif // COMPILER1
4433 #if INCLUDE_JVMCI
4434 || !JVMCIUseFastLocking
4435 #endif
4436 ) {
4437 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4438 // flag set to true on command line; warn the user that they
4439 // can't enable biased locking here
4440 warning("Biased Locking is not supported with locking debug flags"
4441 "; ignoring UseBiasedLocking flag." );
4442 }
4443 UseBiasedLocking = false;
4444 }
4445
4446 #ifdef CC_INTERP
4447 // Clear flags not supported on zero.
4448 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4449 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4450 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4451 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4452 #endif // CC_INTERP
4453
4454 #ifdef COMPILER2
4455 if (!EliminateLocks) {
4456 EliminateNestedLocks = false;
4457 }
4458 if (!Inline) {
4459 IncrementalInline = false;
4460 }
4461 #ifndef PRODUCT
4462 if (!IncrementalInline) {
4463 AlwaysIncrementalInline = false;
4464 }
4465 #endif
4466 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4467 // nothing to use the profiling, turn if off
4468 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4469 }
4470 #endif
4471
4472 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4473 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4474 DebugNonSafepoints = true;
4475 }
4476
4477 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4478 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4479 }
4480
4481 if (UseOnStackReplacement && !UseLoopCounter) {
4482 warning("On-stack-replacement requires loop counters; enabling loop counters");
4483 FLAG_SET_DEFAULT(UseLoopCounter, true);
4484 }
4485
4486 #ifndef PRODUCT
4487 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4488 if (use_vm_log()) {
4489 LogVMOutput = true;
4490 }
4491 }
4492 #endif // PRODUCT
4493
4494 if (PrintCommandLineFlags) {
4495 CommandLineFlags::printSetFlags(tty);
4496 }
4497
4498 // Apply CPU specific policy for the BiasedLocking
4499 if (UseBiasedLocking) {
4500 if (!VM_Version::use_biased_locking() &&
4501 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4502 UseBiasedLocking = false;
4503 }
4504 }
4505 #ifdef COMPILER2
4506 if (!UseBiasedLocking || EmitSync != 0) {
4507 UseOptoBiasInlining = false;
4508 }
4509 #endif
4510
4511 return JNI_OK;
4512 }
4513
4514 jint Arguments::adjust_after_os() {
4515 if (UseNUMA) {
4516 if (UseParallelGC || UseParallelOldGC) {
4517 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4518 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4519 }
4520 }
4521 // UseNUMAInterleaving is set to ON for all collectors and
4522 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4523 // such as the parallel collector for Linux and Solaris will
4524 // interleave old gen and survivor spaces on top of NUMA
4525 // allocation policy for the eden space.
4526 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4527 // all platforms and ParallelGC on Windows will interleave all
4528 // of the heap spaces across NUMA nodes.
4529 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4530 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4531 }
4532 }
4533 return JNI_OK;
4534 }
4535
4536 int Arguments::PropertyList_count(SystemProperty* pl) {
4537 int count = 0;
4538 while(pl != NULL) {
4539 count++;
4540 pl = pl->next();
4541 }
4542 return count;
4543 }
4544
4545 // Return the number of readable properties.
4546 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4547 int count = 0;
4548 while(pl != NULL) {
4549 if (pl->is_readable()) {
4550 count++;
4551 }
4552 pl = pl->next();
4553 }
4554 return count;
4555 }
4556
4557 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4558 assert(key != NULL, "just checking");
4559 SystemProperty* prop;
4560 for (prop = pl; prop != NULL; prop = prop->next()) {
4561 if (strcmp(key, prop->key()) == 0) return prop->value();
4562 }
4563 return NULL;
4564 }
4565
4566 // Return the value of the requested property provided that it is a readable property.
4567 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4568 assert(key != NULL, "just checking");
4569 SystemProperty* prop;
4570 // Return the property value if the keys match and the property is not internal or
4571 // it's the special internal property "jdk.boot.class.path.append".
4572 for (prop = pl; prop != NULL; prop = prop->next()) {
4573 if (strcmp(key, prop->key()) == 0) {
4574 if (!prop->internal()) {
4575 return prop->value();
4576 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4577 return prop->value();
4578 } else {
4579 // Property is internal and not jdk.boot.class.path.append so return NULL.
4580 return NULL;
4581 }
4582 }
4583 }
4584 return NULL;
4585 }
4586
4587 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4588 int count = 0;
4589 const char* ret_val = NULL;
4590
4591 while(pl != NULL) {
4592 if(count >= index) {
4593 ret_val = pl->key();
4594 break;
4595 }
4596 count++;
4597 pl = pl->next();
4598 }
4599
4600 return ret_val;
4601 }
4602
4603 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4604 int count = 0;
4605 char* ret_val = NULL;
4606
4607 while(pl != NULL) {
4608 if(count >= index) {
4609 ret_val = pl->value();
4610 break;
4611 }
4612 count++;
4613 pl = pl->next();
4614 }
4615
4616 return ret_val;
4617 }
4618
4619 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4620 SystemProperty* p = *plist;
4621 if (p == NULL) {
4622 *plist = new_p;
4623 } else {
4624 while (p->next() != NULL) {
4625 p = p->next();
4626 }
4627 p->set_next(new_p);
4628 }
4629 }
4630
4631 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4632 bool writeable, bool internal) {
4633 if (plist == NULL)
4634 return;
4635
4636 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4637 PropertyList_add(plist, new_p);
4638 }
4639
4640 void Arguments::PropertyList_add(SystemProperty *element) {
4641 PropertyList_add(&_system_properties, element);
4642 }
4643
4644 // This add maintains unique property key in the list.
4645 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4646 PropertyAppendable append, PropertyWriteable writeable,
4647 PropertyInternal internal) {
4648 if (plist == NULL)
4649 return;
4650
4651 // If property key exist then update with new value.
4652 SystemProperty* prop;
4653 for (prop = *plist; prop != NULL; prop = prop->next()) {
4654 if (strcmp(k, prop->key()) == 0) {
4655 if (append == AppendProperty) {
4656 prop->append_value(v);
4657 } else {
4658 prop->set_value(v);
4659 }
4660 return;
4661 }
4662 }
4663
4664 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4665 }
4666
4667 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4668 // Returns true if all of the source pointed by src has been copied over to
4669 // the destination buffer pointed by buf. Otherwise, returns false.
4670 // Notes:
4671 // 1. If the length (buflen) of the destination buffer excluding the
4672 // NULL terminator character is not long enough for holding the expanded
4673 // pid characters, it also returns false instead of returning the partially
4674 // expanded one.
4675 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4676 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4677 char* buf, size_t buflen) {
4678 const char* p = src;
4679 char* b = buf;
4680 const char* src_end = &src[srclen];
4681 char* buf_end = &buf[buflen - 1];
4682
4683 while (p < src_end && b < buf_end) {
4684 if (*p == '%') {
4685 switch (*(++p)) {
4686 case '%': // "%%" ==> "%"
4687 *b++ = *p++;
4688 break;
4689 case 'p': { // "%p" ==> current process id
4690 // buf_end points to the character before the last character so
4691 // that we could write '\0' to the end of the buffer.
4692 size_t buf_sz = buf_end - b + 1;
4693 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4694
4695 // if jio_snprintf fails or the buffer is not long enough to hold
4696 // the expanded pid, returns false.
4697 if (ret < 0 || ret >= (int)buf_sz) {
4698 return false;
4699 } else {
4700 b += ret;
4701 assert(*b == '\0', "fail in copy_expand_pid");
4702 if (p == src_end && b == buf_end + 1) {
4703 // reach the end of the buffer.
4704 return true;
4705 }
4706 }
4707 p++;
4708 break;
4709 }
4710 default :
4711 *b++ = '%';
4712 }
4713 } else {
4714 *b++ = *p++;
4715 }
4716 }
4717 *b = '\0';
4718 return (p == src_end); // return false if not all of the source was copied
4719 }