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 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
355 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
356 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
357 // the command-line as usual, but will issue a warning.
358 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
359 // the command-line, while issuing a warning and ignoring the flag value.
360 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
361 // existence of the flag.
362 //
363 // MANUAL CLEANUP ON JDK VERSION UPDATES:
364 // This table ensures that the handling of options will update automatically when the JDK
365 // version is incremented, but the source code needs to be cleanup up manually:
366 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
367 // variable should be removed, as well as users of the variable.
368 // - As "deprecated" options age into "obsolete" options, move the entry into the
369 // "Obsolete Flags" section of the table.
370 // - All expired options should be removed from the table.
371 static SpecialFlag const special_jvm_flags[] = {
372 // -------------- Deprecated Flags --------------
373 // --- Non-alias flags - sorted by obsolete_in then expired_in:
374 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
375 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
376 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
377 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
378 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
379 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
380
381 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
382 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
385 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
386 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
387 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
388 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
389
390 // -------------- Obsolete Flags - sorted by expired_in --------------
391 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
392 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
393 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
394 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
395 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 #ifndef ZERO
405 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 #endif // ZERO
408 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
410 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
420 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
421
422 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
423 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
424 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
425 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
426 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
427 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
428 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
429 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
430 #endif
431
432 { NULL, JDK_Version(0), JDK_Version(0) }
433 };
434
435 // Flags that are aliases for other flags.
436 typedef struct {
437 const char* alias_name;
438 const char* real_name;
439 } AliasedFlag;
440
441 static AliasedFlag const aliased_jvm_flags[] = {
442 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
443 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
444 { "CMSMarkStackSize", "MarkStackSize" },
445 { "G1MarkStackSize", "MarkStackSize" },
446 { "ParallelMarkingThreads", "ConcGCThreads" },
447 { "ParallelCMSThreads", "ConcGCThreads" },
448 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
449 { NULL, NULL}
450 };
451
452 // NOTE: A compatibility request will be necessary for each alias to be removed.
453 static AliasedLoggingFlag const aliased_logging_flags[] = {
454 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
455 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
456 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
457 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
458 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
459 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
460 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
461 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
462 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
463 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
464 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
465 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
466 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
467 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
468 };
469
470 #ifndef PRODUCT
471 // These options are removed in jdk9. Remove this code for jdk10.
472 static AliasedFlag const removed_develop_logging_flags[] = {
473 { "TraceClassInitialization", "-Xlog:class+init" },
474 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
475 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
476 { "TraceItables", "-Xlog:itables=debug" },
477 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
478 { "TraceSafepoint", "-Xlog:safepoint=debug" },
479 { "TraceStartupTime", "-Xlog:startuptime" },
480 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
481 { "PrintVtables", "-Xlog:vtables=debug" },
482 { "VerboseVerification", "-Xlog:verification" },
483 { NULL, NULL }
484 };
485 #endif //PRODUCT
486
487 // Return true if "v" is less than "other", where "other" may be "undefined".
488 static bool version_less_than(JDK_Version v, JDK_Version other) {
489 assert(!v.is_undefined(), "must be defined");
490 if (!other.is_undefined() && v.compare(other) >= 0) {
491 return false;
492 } else {
493 return true;
494 }
495 }
496
497 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
498
499 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
500 // Allow extensions to have priority
501 if (lookup_special_flag_ext(flag_name, flag)) {
502 return true;
503 }
504
505 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
506 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
507 flag = special_jvm_flags[i];
508 return true;
509 }
510 }
511 return false;
512 }
513
514 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
515 assert(version != NULL, "Must provide a version buffer");
516 SpecialFlag flag;
517 if (lookup_special_flag(flag_name, flag)) {
518 if (!flag.obsolete_in.is_undefined()) {
519 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
520 *version = flag.obsolete_in;
521 return true;
522 }
523 }
524 }
525 return false;
526 }
527
528 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
529 assert(version != NULL, "Must provide a version buffer");
530 SpecialFlag flag;
531 if (lookup_special_flag(flag_name, flag)) {
532 if (!flag.deprecated_in.is_undefined()) {
533 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
534 version_less_than(JDK_Version::current(), flag.expired_in)) {
535 *version = flag.deprecated_in;
536 return 1;
537 } else {
538 return -1;
539 }
540 }
541 }
542 return 0;
543 }
544
545 #ifndef PRODUCT
546 const char* Arguments::removed_develop_logging_flag_name(const char* name){
547 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
548 const AliasedFlag& flag = removed_develop_logging_flags[i];
549 if (strcmp(flag.alias_name, name) == 0) {
550 return flag.real_name;
551 }
552 }
553 return NULL;
554 }
555 #endif // PRODUCT
556
557 const char* Arguments::real_flag_name(const char *flag_name) {
558 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
559 const AliasedFlag& flag_status = aliased_jvm_flags[i];
560 if (strcmp(flag_status.alias_name, flag_name) == 0) {
561 return flag_status.real_name;
562 }
563 }
564 return flag_name;
565 }
566
567 #ifdef ASSERT
568 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
569 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
570 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
571 return true;
572 }
573 }
574 return false;
575 }
576
577 static bool verify_special_jvm_flags() {
578 bool success = true;
579 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
580 const SpecialFlag& flag = special_jvm_flags[i];
581 if (lookup_special_flag(flag.name, i)) {
582 warning("Duplicate special flag declaration \"%s\"", flag.name);
583 success = false;
584 }
585 if (flag.deprecated_in.is_undefined() &&
586 flag.obsolete_in.is_undefined()) {
587 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
588 success = false;
589 }
590
591 if (!flag.deprecated_in.is_undefined()) {
592 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
593 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
594 success = false;
595 }
596
597 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
598 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
599 success = false;
600 }
601 }
602
603 if (!flag.obsolete_in.is_undefined()) {
604 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
605 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
606 success = false;
607 }
608
609 // if flag has become obsolete it should not have a "globals" flag defined anymore.
610 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
611 if (Flag::find_flag(flag.name) != NULL) {
612 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
613 success = false;
614 }
615 }
616 }
617
618 if (!flag.expired_in.is_undefined()) {
619 // if flag has become expired it should not have a "globals" flag defined anymore.
620 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
621 if (Flag::find_flag(flag.name) != NULL) {
622 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
623 success = false;
624 }
625 }
626 }
627
628 }
629 return success;
630 }
631 #endif
632
633 // Parses a size specification string.
634 bool Arguments::atojulong(const char *s, julong* result) {
635 julong n = 0;
636
637 // First char must be a digit. Don't allow negative numbers or leading spaces.
638 if (!isdigit(*s)) {
639 return false;
640 }
641
642 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
643 char* remainder;
644 errno = 0;
645 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
646 if (errno != 0) {
647 return false;
648 }
649
650 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
651 if (remainder == s || strlen(remainder) > 1) {
652 return false;
653 }
654
655 switch (*remainder) {
656 case 'T': case 't':
657 *result = n * G * K;
658 // Check for overflow.
659 if (*result/((julong)G * K) != n) return false;
660 return true;
661 case 'G': case 'g':
662 *result = n * G;
663 if (*result/G != n) return false;
664 return true;
665 case 'M': case 'm':
666 *result = n * M;
667 if (*result/M != n) return false;
668 return true;
669 case 'K': case 'k':
670 *result = n * K;
671 if (*result/K != n) return false;
672 return true;
673 case '\0':
674 *result = n;
675 return true;
676 default:
677 return false;
678 }
679 }
680
681 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
682 if (size < min_size) return arg_too_small;
683 // Check that size will fit in a size_t (only relevant on 32-bit)
684 if (size > max_uintx) return arg_too_big;
685 return arg_in_range;
686 }
687
688 // Describe an argument out of range error
689 void Arguments::describe_range_error(ArgsRange errcode) {
690 switch(errcode) {
691 case arg_too_big:
692 jio_fprintf(defaultStream::error_stream(),
693 "The specified size exceeds the maximum "
694 "representable size.\n");
695 break;
696 case arg_too_small:
697 case arg_unreadable:
698 case arg_in_range:
699 // do nothing for now
700 break;
701 default:
702 ShouldNotReachHere();
703 }
704 }
705
706 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
707 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
708 return true;
709 } else {
710 return false;
711 }
712 }
713
714 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
715 char* end;
716 errno = 0;
717 double v = strtod(value, &end);
718 if ((errno != 0) || (*end != 0)) {
719 return false;
720 }
721
722 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
723 return true;
724 }
725 return false;
726 }
727
728 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
729 julong v;
730 int int_v;
731 intx intx_v;
732 bool is_neg = false;
733 Flag* result = Flag::find_flag(name, strlen(name));
734
735 if (result == NULL) {
736 return false;
737 }
738
739 // Check the sign first since atojulong() parses only unsigned values.
740 if (*value == '-') {
741 if (!result->is_intx() && !result->is_int()) {
742 return false;
743 }
744 value++;
745 is_neg = true;
746 }
747 if (!Arguments::atojulong(value, &v)) {
748 return false;
749 }
750 if (result->is_int()) {
751 int_v = (int) v;
752 if (is_neg) {
753 int_v = -int_v;
754 }
755 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
756 } else if (result->is_uint()) {
757 uint uint_v = (uint) v;
758 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
759 } else if (result->is_intx()) {
760 intx_v = (intx) v;
761 if (is_neg) {
762 intx_v = -intx_v;
763 }
764 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
765 } else if (result->is_uintx()) {
766 uintx uintx_v = (uintx) v;
767 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
768 } else if (result->is_uint64_t()) {
769 uint64_t uint64_t_v = (uint64_t) v;
770 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
771 } else if (result->is_size_t()) {
772 size_t size_t_v = (size_t) v;
773 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
774 } else {
775 return false;
776 }
777 }
778
779 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
780 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
781 // Contract: CommandLineFlags always returns a pointer that needs freeing.
782 FREE_C_HEAP_ARRAY(char, value);
783 return true;
784 }
785
786 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
787 const char* old_value = "";
788 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
789 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
790 size_t new_len = strlen(new_value);
791 const char* value;
792 char* free_this_too = NULL;
793 if (old_len == 0) {
794 value = new_value;
795 } else if (new_len == 0) {
796 value = old_value;
797 } else {
798 size_t length = old_len + 1 + new_len + 1;
799 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
800 // each new setting adds another LINE to the switch:
801 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
802 value = buf;
803 free_this_too = buf;
804 }
805 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
806 // CommandLineFlags always returns a pointer that needs freeing.
807 FREE_C_HEAP_ARRAY(char, value);
808 if (free_this_too != NULL) {
809 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
810 FREE_C_HEAP_ARRAY(char, free_this_too);
811 }
812 return true;
813 }
814
815 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
816 const char* real_name = real_flag_name(arg);
817 JDK_Version since = JDK_Version();
818 switch (is_deprecated_flag(arg, &since)) {
819 case -1:
820 return NULL; // obsolete or expired, don't process normally
821 case 0:
822 return real_name;
823 case 1: {
824 if (warn) {
825 char version[256];
826 since.to_string(version, sizeof(version));
827 if (real_name != arg) {
828 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
829 arg, version, real_name);
830 } else {
831 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
832 arg, version);
833 }
834 }
835 return real_name;
836 }
837 }
838 ShouldNotReachHere();
839 return NULL;
840 }
841
842 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
843 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
844 // Set tagset string buffer at max size of 256, large enough for any alias tagset
845 const int max_tagset_size = 256;
846 int max_tagset_len = max_tagset_size - 1;
847 char tagset_buffer[max_tagset_size];
848 tagset_buffer[0] = '\0';
849
850 // Write tag-set for aliased logging option, in string list form
851 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
852 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
853 if (i > 0) {
854 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
855 }
856 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
857 }
858 if (!alf.exactMatch) {
859 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
860 }
861 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
862 (on) ? "+" : "-",
863 name,
864 tagset_buffer,
865 (on) ? LogLevel::name(alf.level) : "off");
866 }
867
868 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
869 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
870 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
871 if (strcmp(alf.alias_name, name) == 0) {
872 log_deprecated_flag(name, on, alf);
873 return alf;
874 }
875 }
876 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
877 return a;
878 }
879
880 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
881
882 // range of acceptable characters spelled out for portability reasons
883 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
884 #define BUFLEN 255
885 char name[BUFLEN+1];
886 char dummy;
887 const char* real_name;
888 bool warn_if_deprecated = true;
889
890 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
891 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
892 if (alf.alias_name != NULL){
893 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
894 return true;
895 }
896 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
897 if (real_name == NULL) {
898 return false;
899 }
900 return set_bool_flag(real_name, false, origin);
901 }
902 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
903 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
904 if (alf.alias_name != NULL){
905 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
906 return true;
907 }
908 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
909 if (real_name == NULL) {
910 return false;
911 }
912 return set_bool_flag(real_name, true, origin);
913 }
914
915 char punct;
916 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
917 const char* value = strchr(arg, '=') + 1;
918 Flag* flag;
919
920 // this scanf pattern matches both strings (handled here) and numbers (handled later))
921 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
922 if (alf.alias_name != NULL) {
923 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
924 return true;
925 }
926 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
927 if (real_name == NULL) {
928 return false;
929 }
930 flag = Flag::find_flag(real_name);
931 if (flag != NULL && flag->is_ccstr()) {
932 if (flag->ccstr_accumulates()) {
933 return append_to_string_flag(real_name, value, origin);
934 } else {
935 if (value[0] == '\0') {
936 value = NULL;
937 }
938 return set_string_flag(real_name, value, origin);
939 }
940 } else {
941 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
942 }
943 }
944
945 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
946 const char* value = strchr(arg, '=') + 1;
947 // -XX:Foo:=xxx will reset the string flag to the given value.
948 if (value[0] == '\0') {
949 value = NULL;
950 }
951 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
952 if (real_name == NULL) {
953 return false;
954 }
955 return set_string_flag(real_name, value, origin);
956 }
957
958 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
959 #define SIGNED_NUMBER_RANGE "[-0123456789]"
960 #define NUMBER_RANGE "[0123456789eE+-]"
961 char value[BUFLEN + 1];
962 char value2[BUFLEN + 1];
963 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
964 // Looks like a floating-point number -- try again with more lenient format string
965 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
966 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
967 if (real_name == NULL) {
968 return false;
969 }
970 return set_fp_numeric_flag(real_name, value, origin);
971 }
972 }
973
974 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
975 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
976 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
977 if (real_name == NULL) {
978 return false;
979 }
980 return set_numeric_flag(real_name, value, origin);
981 }
982
983 return false;
984 }
985
986 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
987 assert(bldarray != NULL, "illegal argument");
988
989 if (arg == NULL) {
990 return;
991 }
992
993 int new_count = *count + 1;
994
995 // expand the array and add arg to the last element
996 if (*bldarray == NULL) {
997 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
998 } else {
999 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1000 }
1001 (*bldarray)[*count] = os::strdup_check_oom(arg);
1002 *count = new_count;
1003 }
1004
1005 void Arguments::build_jvm_args(const char* arg) {
1006 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1007 }
1008
1009 void Arguments::build_jvm_flags(const char* arg) {
1010 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1011 }
1012
1013 // utility function to return a string that concatenates all
1014 // strings in a given char** array
1015 const char* Arguments::build_resource_string(char** args, int count) {
1016 if (args == NULL || count == 0) {
1017 return NULL;
1018 }
1019 size_t length = 0;
1020 for (int i = 0; i < count; i++) {
1021 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1022 }
1023 char* s = NEW_RESOURCE_ARRAY(char, length);
1024 char* dst = s;
1025 for (int j = 0; j < count; j++) {
1026 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1027 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1028 dst += offset;
1029 length -= offset;
1030 }
1031 return (const char*) s;
1032 }
1033
1034 void Arguments::print_on(outputStream* st) {
1035 st->print_cr("VM Arguments:");
1036 if (num_jvm_flags() > 0) {
1037 st->print("jvm_flags: "); print_jvm_flags_on(st);
1038 st->cr();
1039 }
1040 if (num_jvm_args() > 0) {
1041 st->print("jvm_args: "); print_jvm_args_on(st);
1042 st->cr();
1043 }
1044 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1045 if (_java_class_path != NULL) {
1046 char* path = _java_class_path->value();
1047 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1048 }
1049 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1050 }
1051
1052 void Arguments::print_summary_on(outputStream* st) {
1053 // Print the command line. Environment variables that are helpful for
1054 // reproducing the problem are written later in the hs_err file.
1055 // flags are from setting file
1056 if (num_jvm_flags() > 0) {
1057 st->print_raw("Settings File: ");
1058 print_jvm_flags_on(st);
1059 st->cr();
1060 }
1061 // args are the command line and environment variable arguments.
1062 st->print_raw("Command Line: ");
1063 if (num_jvm_args() > 0) {
1064 print_jvm_args_on(st);
1065 }
1066 // this is the classfile and any arguments to the java program
1067 if (java_command() != NULL) {
1068 st->print("%s", java_command());
1069 }
1070 st->cr();
1071 }
1072
1073 void Arguments::print_jvm_flags_on(outputStream* st) {
1074 if (_num_jvm_flags > 0) {
1075 for (int i=0; i < _num_jvm_flags; i++) {
1076 st->print("%s ", _jvm_flags_array[i]);
1077 }
1078 }
1079 }
1080
1081 void Arguments::print_jvm_args_on(outputStream* st) {
1082 if (_num_jvm_args > 0) {
1083 for (int i=0; i < _num_jvm_args; i++) {
1084 st->print("%s ", _jvm_args_array[i]);
1085 }
1086 }
1087 }
1088
1089 bool Arguments::process_argument(const char* arg,
1090 jboolean ignore_unrecognized,
1091 Flag::Flags origin) {
1092 JDK_Version since = JDK_Version();
1093
1094 if (parse_argument(arg, origin)) {
1095 return true;
1096 }
1097
1098 // Determine if the flag has '+', '-', or '=' characters.
1099 bool has_plus_minus = (*arg == '+' || *arg == '-');
1100 const char* const argname = has_plus_minus ? arg + 1 : arg;
1101
1102 size_t arg_len;
1103 const char* equal_sign = strchr(argname, '=');
1104 if (equal_sign == NULL) {
1105 arg_len = strlen(argname);
1106 } else {
1107 arg_len = equal_sign - argname;
1108 }
1109
1110 // Only make the obsolete check for valid arguments.
1111 if (arg_len <= BUFLEN) {
1112 // Construct a string which consists only of the argument name without '+', '-', or '='.
1113 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1114 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1115 if (is_obsolete_flag(stripped_argname, &since)) {
1116 char version[256];
1117 since.to_string(version, sizeof(version));
1118 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1119 return true;
1120 }
1121 #ifndef PRODUCT
1122 else {
1123 const char* replacement;
1124 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1125 log_warning(arguments)("%s has been removed. Please use %s instead.",
1126 stripped_argname,
1127 replacement);
1128 return false;
1129 }
1130 }
1131 #endif //PRODUCT
1132 }
1133
1134 // For locked flags, report a custom error message if available.
1135 // Otherwise, report the standard unrecognized VM option.
1136 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1137 if (found_flag != NULL) {
1138 char locked_message_buf[BUFLEN];
1139 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1140 if (strlen(locked_message_buf) == 0) {
1141 if (found_flag->is_bool() && !has_plus_minus) {
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Missing +/- setting for VM option '%s'\n", argname);
1144 } else if (!found_flag->is_bool() && has_plus_minus) {
1145 jio_fprintf(defaultStream::error_stream(),
1146 "Unexpected +/- setting in VM option '%s'\n", argname);
1147 } else {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Improperly specified VM option '%s'\n", argname);
1150 }
1151 } else {
1152 #ifdef PRODUCT
1153 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1154 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1155 if (ignore_unrecognized && mismatched) {
1156 return true;
1157 }
1158 #endif
1159 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1160 }
1161 } else {
1162 if (ignore_unrecognized) {
1163 return true;
1164 }
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Unrecognized VM option '%s'\n", argname);
1167 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1168 if (fuzzy_matched != NULL) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Did you mean '%s%s%s'? ",
1171 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1172 fuzzy_matched->_name,
1173 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1174 }
1175 }
1176
1177 // allow for commandline "commenting out" options like -XX:#+Verbose
1178 return arg[0] == '#';
1179 }
1180
1181 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1182 FILE* stream = fopen(file_name, "rb");
1183 if (stream == NULL) {
1184 if (should_exist) {
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Could not open settings file %s\n", file_name);
1187 return false;
1188 } else {
1189 return true;
1190 }
1191 }
1192
1193 char token[1024];
1194 int pos = 0;
1195
1196 bool in_white_space = true;
1197 bool in_comment = false;
1198 bool in_quote = false;
1199 char quote_c = 0;
1200 bool result = true;
1201
1202 int c = getc(stream);
1203 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1204 if (in_white_space) {
1205 if (in_comment) {
1206 if (c == '\n') in_comment = false;
1207 } else {
1208 if (c == '#') in_comment = true;
1209 else if (!isspace(c)) {
1210 in_white_space = false;
1211 token[pos++] = c;
1212 }
1213 }
1214 } else {
1215 if (c == '\n' || (!in_quote && isspace(c))) {
1216 // token ends at newline, or at unquoted whitespace
1217 // this allows a way to include spaces in string-valued options
1218 token[pos] = '\0';
1219 logOption(token);
1220 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1221 build_jvm_flags(token);
1222 pos = 0;
1223 in_white_space = true;
1224 in_quote = false;
1225 } else if (!in_quote && (c == '\'' || c == '"')) {
1226 in_quote = true;
1227 quote_c = c;
1228 } else if (in_quote && (c == quote_c)) {
1229 in_quote = false;
1230 } else {
1231 token[pos++] = c;
1232 }
1233 }
1234 c = getc(stream);
1235 }
1236 if (pos > 0) {
1237 token[pos] = '\0';
1238 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1239 build_jvm_flags(token);
1240 }
1241 fclose(stream);
1242 return result;
1243 }
1244
1245 //=============================================================================================================
1246 // Parsing of properties (-D)
1247
1248 const char* Arguments::get_property(const char* key) {
1249 return PropertyList_get_value(system_properties(), key);
1250 }
1251
1252 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1253 const char* eq = strchr(prop, '=');
1254 const char* key;
1255 const char* value = "";
1256
1257 if (eq == NULL) {
1258 // property doesn't have a value, thus use passed string
1259 key = prop;
1260 } else {
1261 // property have a value, thus extract it and save to the
1262 // allocated string
1263 size_t key_len = eq - prop;
1264 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1265
1266 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1267 key = tmp_key;
1268
1269 value = &prop[key_len + 1];
1270 }
1271
1272 if (strcmp(key, "java.compiler") == 0) {
1273 process_java_compiler_argument(value);
1274 // Record value in Arguments, but let it get passed to Java.
1275 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1276 strcmp(key, "sun.java.launcher.pid") == 0) {
1277 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1278 // private and are processed in process_sun_java_launcher_properties();
1279 // the sun.java.launcher property is passed on to the java application
1280 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1281 // append is true, writable is true, internal is false
1282 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1283 WriteableProperty, ExternalProperty);
1284 } else {
1285 if (strcmp(key, "sun.java.command") == 0) {
1286 char *old_java_command = _java_command;
1287 _java_command = os::strdup_check_oom(value, mtArguments);
1288 if (old_java_command != NULL) {
1289 os::free(old_java_command);
1290 }
1291 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1292 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1293 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1294 // its value without going through the property list or making a Java call.
1295 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1296 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1297 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1298 os::free((void *)old_java_vendor_url_bug);
1299 }
1300 }
1301
1302 // Create new property and add at the end of the list
1303 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1304 }
1305
1306 if (key != prop) {
1307 // SystemProperty copy passed value, thus free previously allocated
1308 // memory
1309 FreeHeap((void *)key);
1310 }
1311
1312 return true;
1313 }
1314
1315 #if INCLUDE_CDS
1316 void Arguments::check_unsupported_dumping_properties() {
1317 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1318 const char* unsupported_properties[] = { "jdk.module.main",
1319 "jdk.module.limitmods",
1320 "jdk.module.path",
1321 "jdk.module.upgrade.path",
1322 "jdk.module.addmods.0" };
1323 const char* unsupported_options[] = { "-m",
1324 "--limit-modules",
1325 "--module-path",
1326 "--upgrade-module-path",
1327 "--add-modules" };
1328 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1329 // If a vm option is found in the unsupported_options array with index less than the warning_idx,
1330 // vm will exit with an error message. Otherwise, it will result in a warning message.
1331 uint warning_idx = 2;
1332 SystemProperty* sp = system_properties();
1333 while (sp != NULL) {
1334 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1335 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1336 if (i < warning_idx) {
1337 vm_exit_during_initialization(
1338 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1339 } else {
1340 warning(
1341 "the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1342 }
1343 }
1344 }
1345 sp = sp->next();
1346 }
1347
1348 // Check for an exploded module build in use with -Xshare:dump.
1349 if (!has_jimage()) {
1350 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1351 }
1352 }
1353 #endif
1354
1355 //===========================================================================================================
1356 // Setting int/mixed/comp mode flags
1357
1358 void Arguments::set_mode_flags(Mode mode) {
1359 // Set up default values for all flags.
1360 // If you add a flag to any of the branches below,
1361 // add a default value for it here.
1362 set_java_compiler(false);
1363 _mode = mode;
1364
1365 // Ensure Agent_OnLoad has the correct initial values.
1366 // This may not be the final mode; mode may change later in onload phase.
1367 PropertyList_unique_add(&_system_properties, "java.vm.info",
1368 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1369
1370 UseInterpreter = true;
1371 UseCompiler = true;
1372 UseLoopCounter = true;
1373
1374 // Default values may be platform/compiler dependent -
1375 // use the saved values
1376 ClipInlining = Arguments::_ClipInlining;
1377 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1378 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1379 BackgroundCompilation = Arguments::_BackgroundCompilation;
1380 if (TieredCompilation) {
1381 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1382 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1383 }
1384 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1385 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1386 }
1387 }
1388
1389 // Change from defaults based on mode
1390 switch (mode) {
1391 default:
1392 ShouldNotReachHere();
1393 break;
1394 case _int:
1395 UseCompiler = false;
1396 UseLoopCounter = false;
1397 AlwaysCompileLoopMethods = false;
1398 UseOnStackReplacement = false;
1399 break;
1400 case _mixed:
1401 // same as default
1402 break;
1403 case _comp:
1404 UseInterpreter = false;
1405 BackgroundCompilation = false;
1406 ClipInlining = false;
1407 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1408 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1409 // compile a level 4 (C2) and then continue executing it.
1410 if (TieredCompilation) {
1411 Tier3InvokeNotifyFreqLog = 0;
1412 Tier4InvocationThreshold = 0;
1413 }
1414 break;
1415 }
1416 }
1417
1418 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1419 // Conflict: required to use shared spaces (-Xshare:on), but
1420 // incompatible command line options were chosen.
1421
1422 static void no_shared_spaces(const char* message) {
1423 if (RequireSharedSpaces) {
1424 jio_fprintf(defaultStream::error_stream(),
1425 "Class data sharing is inconsistent with other specified options.\n");
1426 vm_exit_during_initialization("Unable to use shared archive.", message);
1427 } else {
1428 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1429 }
1430 }
1431 #endif
1432
1433 // Returns threshold scaled with the value of scale.
1434 // If scale < 0.0, threshold is returned without scaling.
1435 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1436 if (scale == 1.0 || scale < 0.0) {
1437 return threshold;
1438 } else {
1439 return (intx)(threshold * scale);
1440 }
1441 }
1442
1443 // Returns freq_log scaled with the value of scale.
1444 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1445 // If scale < 0.0, freq_log is returned without scaling.
1446 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1447 // Check if scaling is necessary or if negative value was specified.
1448 if (scale == 1.0 || scale < 0.0) {
1449 return freq_log;
1450 }
1451 // Check values to avoid calculating log2 of 0.
1452 if (scale == 0.0 || freq_log == 0) {
1453 return 0;
1454 }
1455 // Determine the maximum notification frequency value currently supported.
1456 // The largest mask value that the interpreter/C1 can handle is
1457 // of length InvocationCounter::number_of_count_bits. Mask values are always
1458 // one bit shorter then the value of the notification frequency. Set
1459 // max_freq_bits accordingly.
1460 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1461 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1462 if (scaled_freq == 0) {
1463 // Return 0 right away to avoid calculating log2 of 0.
1464 return 0;
1465 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1466 return max_freq_bits;
1467 } else {
1468 return log2_intptr(scaled_freq);
1469 }
1470 }
1471
1472 void Arguments::set_tiered_flags() {
1473 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1474 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1475 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1476 }
1477 if (CompilationPolicyChoice < 2) {
1478 vm_exit_during_initialization(
1479 "Incompatible compilation policy selected", NULL);
1480 }
1481 // Increase the code cache size - tiered compiles a lot more.
1482 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1483 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1484 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1485 }
1486 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1487 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1488 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1489 }
1490 if (!UseInterpreter) { // -Xcomp
1491 Tier3InvokeNotifyFreqLog = 0;
1492 Tier4InvocationThreshold = 0;
1493 }
1494
1495 if (CompileThresholdScaling < 0) {
1496 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1497 }
1498
1499 // Scale tiered compilation thresholds.
1500 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1501 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1502 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1503 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1504
1505 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1506 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1507 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1508 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1509
1510 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1511 // once these thresholds become supported.
1512
1513 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1514 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1515
1516 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1517 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1518
1519 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1520
1521 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1522 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1523 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1524 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1525 }
1526 }
1527
1528 #if INCLUDE_ALL_GCS
1529 static void disable_adaptive_size_policy(const char* collector_name) {
1530 if (UseAdaptiveSizePolicy) {
1531 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1532 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1533 collector_name);
1534 }
1535 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1536 }
1537 }
1538
1539 void Arguments::set_parnew_gc_flags() {
1540 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1541 "control point invariant");
1542 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1543 assert(UseParNewGC, "ParNew should always be used with CMS");
1544
1545 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1546 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1547 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1548 } else if (ParallelGCThreads == 0) {
1549 jio_fprintf(defaultStream::error_stream(),
1550 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1551 vm_exit(1);
1552 }
1553
1554 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1555 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1556 // we set them to 1024 and 1024.
1557 // See CR 6362902.
1558 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1559 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1560 }
1561 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1562 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1563 }
1564
1565 // When using compressed oops, we use local overflow stacks,
1566 // rather than using a global overflow list chained through
1567 // the klass word of the object's pre-image.
1568 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1569 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1570 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1571 }
1572 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1573 }
1574 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1575 }
1576
1577 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1578 // sparc/solaris for certain applications, but would gain from
1579 // further optimization and tuning efforts, and would almost
1580 // certainly gain from analysis of platform and environment.
1581 void Arguments::set_cms_and_parnew_gc_flags() {
1582 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1583 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1584 assert(UseParNewGC, "ParNew should always be used with CMS");
1585
1586 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1587 disable_adaptive_size_policy("UseConcMarkSweepGC");
1588
1589 set_parnew_gc_flags();
1590
1591 size_t max_heap = align_size_down(MaxHeapSize,
1592 CardTableRS::ct_max_alignment_constraint());
1593
1594 // Now make adjustments for CMS
1595 intx tenuring_default = (intx)6;
1596 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1597
1598 // Preferred young gen size for "short" pauses:
1599 // upper bound depends on # of threads and NewRatio.
1600 const size_t preferred_max_new_size_unaligned =
1601 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1602 size_t preferred_max_new_size =
1603 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1604
1605 // Unless explicitly requested otherwise, size young gen
1606 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1607
1608 // If either MaxNewSize or NewRatio is set on the command line,
1609 // assume the user is trying to set the size of the young gen.
1610 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1611
1612 // Set MaxNewSize to our calculated preferred_max_new_size unless
1613 // NewSize was set on the command line and it is larger than
1614 // preferred_max_new_size.
1615 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1616 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1617 } else {
1618 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1619 }
1620 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1621
1622 // Code along this path potentially sets NewSize and OldSize
1623 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1624 min_heap_size(), InitialHeapSize, max_heap);
1625 size_t min_new = preferred_max_new_size;
1626 if (FLAG_IS_CMDLINE(NewSize)) {
1627 min_new = NewSize;
1628 }
1629 if (max_heap > min_new && min_heap_size() > min_new) {
1630 // Unless explicitly requested otherwise, make young gen
1631 // at least min_new, and at most preferred_max_new_size.
1632 if (FLAG_IS_DEFAULT(NewSize)) {
1633 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1634 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1635 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1636 }
1637 // Unless explicitly requested otherwise, size old gen
1638 // so it's NewRatio x of NewSize.
1639 if (FLAG_IS_DEFAULT(OldSize)) {
1640 if (max_heap > NewSize) {
1641 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1642 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1643 }
1644 }
1645 }
1646 }
1647 // Unless explicitly requested otherwise, definitely
1648 // promote all objects surviving "tenuring_default" scavenges.
1649 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1650 FLAG_IS_DEFAULT(SurvivorRatio)) {
1651 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1652 }
1653 // If we decided above (or user explicitly requested)
1654 // `promote all' (via MaxTenuringThreshold := 0),
1655 // prefer minuscule survivor spaces so as not to waste
1656 // space for (non-existent) survivors
1657 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1658 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1659 }
1660
1661 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1662 // but rather the number of free blocks of a given size that are used when
1663 // replenishing the local per-worker free list caches.
1664 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1665 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1666 // OldPLAB sizing manually turned off: Use a larger default setting,
1667 // unless it was manually specified. This is because a too-low value
1668 // will slow down scavenges.
1669 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1670 } else {
1671 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1672 }
1673 }
1674
1675 // If either of the static initialization defaults have changed, note this
1676 // modification.
1677 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1678 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1679 }
1680
1681 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1682 }
1683 #endif // INCLUDE_ALL_GCS
1684
1685 void set_object_alignment() {
1686 // Object alignment.
1687 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1688 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1689 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1690 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1691 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1692 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1693
1694 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1695 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1696
1697 // Oop encoding heap max
1698 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1699
1700 if (SurvivorAlignmentInBytes == 0) {
1701 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1702 }
1703
1704 #if INCLUDE_ALL_GCS
1705 // Set CMS global values
1706 CompactibleFreeListSpace::set_cms_values();
1707 #endif // INCLUDE_ALL_GCS
1708 }
1709
1710 size_t Arguments::max_heap_for_compressed_oops() {
1711 // Avoid sign flip.
1712 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1713 // We need to fit both the NULL page and the heap into the memory budget, while
1714 // keeping alignment constraints of the heap. To guarantee the latter, as the
1715 // NULL page is located before the heap, we pad the NULL page to the conservative
1716 // maximum alignment that the GC may ever impose upon the heap.
1717 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1718 _conservative_max_heap_alignment);
1719
1720 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1721 NOT_LP64(ShouldNotReachHere(); return 0);
1722 }
1723
1724 bool Arguments::should_auto_select_low_pause_collector() {
1725 if (UseAutoGCSelectPolicy &&
1726 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1727 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1728 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1729 return true;
1730 }
1731 return false;
1732 }
1733
1734 void Arguments::set_use_compressed_oops() {
1735 #ifndef ZERO
1736 #ifdef _LP64
1737 // MaxHeapSize is not set up properly at this point, but
1738 // the only value that can override MaxHeapSize if we are
1739 // to use UseCompressedOops is InitialHeapSize.
1740 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1741
1742 if (max_heap_size <= max_heap_for_compressed_oops()) {
1743 #if !defined(COMPILER1) || defined(TIERED)
1744 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1745 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1746 }
1747 #endif
1748 } else {
1749 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1750 warning("Max heap size too large for Compressed Oops");
1751 FLAG_SET_DEFAULT(UseCompressedOops, false);
1752 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1753 }
1754 }
1755 #endif // _LP64
1756 #endif // ZERO
1757 }
1758
1759
1760 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1761 // set_use_compressed_oops().
1762 void Arguments::set_use_compressed_klass_ptrs() {
1763 #ifndef ZERO
1764 #ifdef _LP64
1765 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1766 if (!UseCompressedOops) {
1767 if (UseCompressedClassPointers) {
1768 warning("UseCompressedClassPointers requires UseCompressedOops");
1769 }
1770 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1771 } else {
1772 // Turn on UseCompressedClassPointers too
1773 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1774 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1775 }
1776 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1777 if (UseCompressedClassPointers) {
1778 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1779 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1780 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1781 }
1782 }
1783 }
1784 #endif // _LP64
1785 #endif // !ZERO
1786 }
1787
1788 void Arguments::set_conservative_max_heap_alignment() {
1789 // The conservative maximum required alignment for the heap is the maximum of
1790 // the alignments imposed by several sources: any requirements from the heap
1791 // itself, the collector policy and the maximum page size we may run the VM
1792 // with.
1793 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1794 #if INCLUDE_ALL_GCS
1795 if (UseParallelGC) {
1796 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1797 } else if (UseG1GC) {
1798 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1799 }
1800 #endif // INCLUDE_ALL_GCS
1801 _conservative_max_heap_alignment = MAX4(heap_alignment,
1802 (size_t)os::vm_allocation_granularity(),
1803 os::max_page_size(),
1804 CollectorPolicy::compute_heap_alignment());
1805 }
1806
1807 bool Arguments::gc_selected() {
1808 #if INCLUDE_ALL_GCS
1809 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1810 #else
1811 return UseSerialGC;
1812 #endif // INCLUDE_ALL_GCS
1813 }
1814
1815 void Arguments::select_gc_ergonomically() {
1816 #if INCLUDE_ALL_GCS
1817 if (os::is_server_class_machine()) {
1818 if (!UseAutoGCSelectPolicy) {
1819 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1820 } else {
1821 if (should_auto_select_low_pause_collector()) {
1822 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1824 } else {
1825 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1826 }
1827 }
1828 } else {
1829 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1830 }
1831 #else
1832 UNSUPPORTED_OPTION(UseG1GC);
1833 UNSUPPORTED_OPTION(UseParallelGC);
1834 UNSUPPORTED_OPTION(UseParallelOldGC);
1835 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1836 UNSUPPORTED_OPTION(UseParNewGC);
1837 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1838 #endif // INCLUDE_ALL_GCS
1839 }
1840
1841 void Arguments::select_gc() {
1842 if (!gc_selected()) {
1843 select_gc_ergonomically();
1844 if (!gc_selected()) {
1845 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1846 }
1847 }
1848 }
1849
1850 void Arguments::set_ergonomics_flags() {
1851 select_gc();
1852
1853 #if defined(COMPILER2) || INCLUDE_JVMCI
1854 // Shared spaces work fine with other GCs but causes bytecode rewriting
1855 // to be disabled, which hurts interpreter performance and decreases
1856 // server performance. When -server is specified, keep the default off
1857 // unless it is asked for. Future work: either add bytecode rewriting
1858 // at link time, or rewrite bytecodes in non-shared methods.
1859 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1860 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1861 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1862 }
1863 #endif
1864
1865 set_conservative_max_heap_alignment();
1866
1867 #ifndef ZERO
1868 #ifdef _LP64
1869 set_use_compressed_oops();
1870
1871 // set_use_compressed_klass_ptrs() must be called after calling
1872 // set_use_compressed_oops().
1873 set_use_compressed_klass_ptrs();
1874
1875 // Also checks that certain machines are slower with compressed oops
1876 // in vm_version initialization code.
1877 #endif // _LP64
1878 #endif // !ZERO
1879
1880 CodeCacheExtensions::set_ergonomics_flags();
1881 }
1882
1883 void Arguments::set_parallel_gc_flags() {
1884 assert(UseParallelGC || UseParallelOldGC, "Error");
1885 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1886 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1887 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1888 }
1889 FLAG_SET_DEFAULT(UseParallelGC, true);
1890
1891 // If no heap maximum was requested explicitly, use some reasonable fraction
1892 // of the physical memory, up to a maximum of 1GB.
1893 FLAG_SET_DEFAULT(ParallelGCThreads,
1894 Abstract_VM_Version::parallel_worker_threads());
1895 if (ParallelGCThreads == 0) {
1896 jio_fprintf(defaultStream::error_stream(),
1897 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1898 vm_exit(1);
1899 }
1900
1901 if (UseAdaptiveSizePolicy) {
1902 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1903 // unless the user actually sets these flags.
1904 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1905 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1906 }
1907 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1908 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1909 }
1910 }
1911
1912 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1913 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1914 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1915 // See CR 6362902 for details.
1916 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1917 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1918 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1919 }
1920 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1921 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1922 }
1923 }
1924
1925 if (UseParallelOldGC) {
1926 // Par compact uses lower default values since they are treated as
1927 // minimums. These are different defaults because of the different
1928 // interpretation and are not ergonomically set.
1929 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1930 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1931 }
1932 }
1933 }
1934
1935 void Arguments::set_g1_gc_flags() {
1936 assert(UseG1GC, "Error");
1937 #if defined(COMPILER1) || INCLUDE_JVMCI
1938 FastTLABRefill = false;
1939 #endif
1940 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1941 if (ParallelGCThreads == 0) {
1942 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1943 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1944 }
1945
1946 #if INCLUDE_ALL_GCS
1947 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1948 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1949 }
1950 #endif
1951
1952 // MarkStackSize will be set (if it hasn't been set by the user)
1953 // when concurrent marking is initialized.
1954 // Its value will be based upon the number of parallel marking threads.
1955 // But we do set the maximum mark stack size here.
1956 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1957 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1958 }
1959
1960 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1961 // In G1, we want the default GC overhead goal to be higher than
1962 // it is for PS, or the heap might be expanded too aggressively.
1963 // We set it here to ~8%.
1964 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1965 }
1966
1967 // Below, we might need to calculate the pause time interval based on
1968 // the pause target. When we do so we are going to give G1 maximum
1969 // flexibility and allow it to do pauses when it needs to. So, we'll
1970 // arrange that the pause interval to be pause time target + 1 to
1971 // ensure that a) the pause time target is maximized with respect to
1972 // the pause interval and b) we maintain the invariant that pause
1973 // time target < pause interval. If the user does not want this
1974 // maximum flexibility, they will have to set the pause interval
1975 // explicitly.
1976
1977 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1978 // The default pause time target in G1 is 200ms
1979 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1980 }
1981
1982 // Then, if the interval parameter was not set, set it according to
1983 // the pause time target (this will also deal with the case when the
1984 // pause time target is the default value).
1985 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1986 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1987 }
1988
1989 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1990 }
1991
1992 void Arguments::set_gc_specific_flags() {
1993 #if INCLUDE_ALL_GCS
1994 // Set per-collector flags
1995 if (UseParallelGC || UseParallelOldGC) {
1996 set_parallel_gc_flags();
1997 } else if (UseConcMarkSweepGC) {
1998 set_cms_and_parnew_gc_flags();
1999 } else if (UseG1GC) {
2000 set_g1_gc_flags();
2001 }
2002 if (AssumeMP && !UseSerialGC) {
2003 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2004 warning("If the number of processors is expected to increase from one, then"
2005 " you should configure the number of parallel GC threads appropriately"
2006 " using -XX:ParallelGCThreads=N");
2007 }
2008 }
2009 if (MinHeapFreeRatio == 100) {
2010 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2011 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2012 }
2013
2014 // If class unloading is disabled, also disable concurrent class unloading.
2015 if (!ClassUnloading) {
2016 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2017 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2018 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2019 }
2020 #endif // INCLUDE_ALL_GCS
2021 }
2022
2023 julong Arguments::limit_by_allocatable_memory(julong limit) {
2024 julong max_allocatable;
2025 julong result = limit;
2026 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2027 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2028 }
2029 return result;
2030 }
2031
2032 // Use static initialization to get the default before parsing
2033 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2034
2035 void Arguments::set_heap_size() {
2036 const julong phys_mem =
2037 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2038 : (julong)MaxRAM;
2039
2040 // If the maximum heap size has not been set with -Xmx,
2041 // then set it as fraction of the size of physical memory,
2042 // respecting the maximum and minimum sizes of the heap.
2043 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2044 julong reasonable_max = phys_mem / MaxRAMFraction;
2045
2046 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2047 // Small physical memory, so use a minimum fraction of it for the heap
2048 reasonable_max = phys_mem / MinRAMFraction;
2049 } else {
2050 // Not-small physical memory, so require a heap at least
2051 // as large as MaxHeapSize
2052 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2053 }
2054 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2055 // Limit the heap size to ErgoHeapSizeLimit
2056 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2057 }
2058 if (UseCompressedOops) {
2059 // Limit the heap size to the maximum possible when using compressed oops
2060 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2061
2062 // HeapBaseMinAddress can be greater than default but not less than.
2063 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2064 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2065 // matches compressed oops printing flags
2066 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2067 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2068 DefaultHeapBaseMinAddress,
2069 DefaultHeapBaseMinAddress/G,
2070 HeapBaseMinAddress);
2071 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2072 }
2073 }
2074
2075 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2076 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2077 // but it should be not less than default MaxHeapSize.
2078 max_coop_heap -= HeapBaseMinAddress;
2079 }
2080 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2081 }
2082 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2083
2084 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2085 // An initial heap size was specified on the command line,
2086 // so be sure that the maximum size is consistent. Done
2087 // after call to limit_by_allocatable_memory because that
2088 // method might reduce the allocation size.
2089 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2090 }
2091
2092 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2093 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2094 }
2095
2096 // If the minimum or initial heap_size have not been set or requested to be set
2097 // ergonomically, set them accordingly.
2098 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2099 julong reasonable_minimum = (julong)(OldSize + NewSize);
2100
2101 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2102
2103 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2104
2105 if (InitialHeapSize == 0) {
2106 julong reasonable_initial = phys_mem / InitialRAMFraction;
2107
2108 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2109 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2110
2111 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2112
2113 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2114 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2115 }
2116 // If the minimum heap size has not been set (via -Xms),
2117 // synchronize with InitialHeapSize to avoid errors with the default value.
2118 if (min_heap_size() == 0) {
2119 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2120 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2121 }
2122 }
2123 }
2124
2125 // This option inspects the machine and attempts to set various
2126 // parameters to be optimal for long-running, memory allocation
2127 // intensive jobs. It is intended for machines with large
2128 // amounts of cpu and memory.
2129 jint Arguments::set_aggressive_heap_flags() {
2130 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2131 // VM, but we may not be able to represent the total physical memory
2132 // available (like having 8gb of memory on a box but using a 32bit VM).
2133 // Thus, we need to make sure we're using a julong for intermediate
2134 // calculations.
2135 julong initHeapSize;
2136 julong total_memory = os::physical_memory();
2137
2138 if (total_memory < (julong) 256 * M) {
2139 jio_fprintf(defaultStream::error_stream(),
2140 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2141 vm_exit(1);
2142 }
2143
2144 // The heap size is half of available memory, or (at most)
2145 // all of possible memory less 160mb (leaving room for the OS
2146 // when using ISM). This is the maximum; because adaptive sizing
2147 // is turned on below, the actual space used may be smaller.
2148
2149 initHeapSize = MIN2(total_memory / (julong) 2,
2150 total_memory - (julong) 160 * M);
2151
2152 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2153
2154 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2155 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2156 return JNI_EINVAL;
2157 }
2158 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2159 return JNI_EINVAL;
2160 }
2161 // Currently the minimum size and the initial heap sizes are the same.
2162 set_min_heap_size(initHeapSize);
2163 }
2164 if (FLAG_IS_DEFAULT(NewSize)) {
2165 // Make the young generation 3/8ths of the total heap.
2166 if (FLAG_SET_CMDLINE(size_t, NewSize,
2167 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2168 return JNI_EINVAL;
2169 }
2170 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2171 return JNI_EINVAL;
2172 }
2173 }
2174
2175 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2176 FLAG_SET_DEFAULT(UseLargePages, true);
2177 #endif
2178
2179 // Increase some data structure sizes for efficiency
2180 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2181 return JNI_EINVAL;
2182 }
2183 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2187 return JNI_EINVAL;
2188 }
2189
2190 // See the OldPLABSize comment below, but replace 'after promotion'
2191 // with 'after copying'. YoungPLABSize is the size of the survivor
2192 // space per-gc-thread buffers. The default is 4kw.
2193 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2194 return JNI_EINVAL;
2195 }
2196
2197 // OldPLABSize is the size of the buffers in the old gen that
2198 // UseParallelGC uses to promote live data that doesn't fit in the
2199 // survivor spaces. At any given time, there's one for each gc thread.
2200 // The default size is 1kw. These buffers are rarely used, since the
2201 // survivor spaces are usually big enough. For specjbb, however, there
2202 // are occasions when there's lots of live data in the young gen
2203 // and we end up promoting some of it. We don't have a definite
2204 // explanation for why bumping OldPLABSize helps, but the theory
2205 // is that a bigger PLAB results in retaining something like the
2206 // original allocation order after promotion, which improves mutator
2207 // locality. A minor effect may be that larger PLABs reduce the
2208 // number of PLAB allocation events during gc. The value of 8kw
2209 // was arrived at by experimenting with specjbb.
2210 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2211 return JNI_EINVAL;
2212 }
2213
2214 // Enable parallel GC and adaptive generation sizing
2215 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 FLAG_SET_DEFAULT(ParallelGCThreads,
2219 Abstract_VM_Version::parallel_worker_threads());
2220
2221 // Encourage steady state memory management
2222 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2223 return JNI_EINVAL;
2224 }
2225
2226 // This appears to improve mutator locality
2227 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2228 return JNI_EINVAL;
2229 }
2230
2231 // Get around early Solaris scheduling bug
2232 // (affinity vs other jobs on system)
2233 // but disallow DR and offlining (5008695).
2234 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2235 return JNI_EINVAL;
2236 }
2237
2238 return JNI_OK;
2239 }
2240
2241 // This must be called after ergonomics.
2242 void Arguments::set_bytecode_flags() {
2243 if (!RewriteBytecodes) {
2244 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2245 }
2246 }
2247
2248 // Aggressive optimization flags -XX:+AggressiveOpts
2249 jint Arguments::set_aggressive_opts_flags() {
2250 #ifdef COMPILER2
2251 if (AggressiveUnboxing) {
2252 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2253 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2254 } else if (!EliminateAutoBox) {
2255 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2256 AggressiveUnboxing = false;
2257 }
2258 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2259 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2260 } else if (!DoEscapeAnalysis) {
2261 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2262 AggressiveUnboxing = false;
2263 }
2264 }
2265 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2266 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2267 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2268 }
2269 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2270 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2271 }
2272
2273 // Feed the cache size setting into the JDK
2274 char buffer[1024];
2275 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2276 if (!add_property(buffer)) {
2277 return JNI_ENOMEM;
2278 }
2279 }
2280 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2281 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2282 }
2283 #endif
2284
2285 if (AggressiveOpts) {
2286 // Sample flag setting code
2287 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2288 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2289 // }
2290 }
2291
2292 return JNI_OK;
2293 }
2294
2295 //===========================================================================================================
2296 // Parsing of java.compiler property
2297
2298 void Arguments::process_java_compiler_argument(const char* arg) {
2299 // For backwards compatibility, Djava.compiler=NONE or ""
2300 // causes us to switch to -Xint mode UNLESS -Xdebug
2301 // is also specified.
2302 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2303 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2304 }
2305 }
2306
2307 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2308 _sun_java_launcher = os::strdup_check_oom(launcher);
2309 }
2310
2311 bool Arguments::created_by_java_launcher() {
2312 assert(_sun_java_launcher != NULL, "property must have value");
2313 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2314 }
2315
2316 bool Arguments::sun_java_launcher_is_altjvm() {
2317 return _sun_java_launcher_is_altjvm;
2318 }
2319
2320 //===========================================================================================================
2321 // Parsing of main arguments
2322
2323 #if INCLUDE_JVMCI
2324 // Check consistency of jvmci vm argument settings.
2325 bool Arguments::check_jvmci_args_consistency() {
2326 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2327 }
2328 #endif //INCLUDE_JVMCI
2329
2330 // Check consistency of GC selection
2331 bool Arguments::check_gc_consistency() {
2332 // Ensure that the user has not selected conflicting sets
2333 // of collectors.
2334 uint i = 0;
2335 if (UseSerialGC) i++;
2336 if (UseConcMarkSweepGC) i++;
2337 if (UseParallelGC || UseParallelOldGC) i++;
2338 if (UseG1GC) i++;
2339 if (i > 1) {
2340 jio_fprintf(defaultStream::error_stream(),
2341 "Conflicting collector combinations in option list; "
2342 "please refer to the release notes for the combinations "
2343 "allowed\n");
2344 return false;
2345 }
2346
2347 if (UseConcMarkSweepGC && !UseParNewGC) {
2348 jio_fprintf(defaultStream::error_stream(),
2349 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2350 return false;
2351 }
2352
2353 if (UseParNewGC && !UseConcMarkSweepGC) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2356 return false;
2357 }
2358
2359 return true;
2360 }
2361
2362 // Check the consistency of vm_init_args
2363 bool Arguments::check_vm_args_consistency() {
2364 // Method for adding checks for flag consistency.
2365 // The intent is to warn the user of all possible conflicts,
2366 // before returning an error.
2367 // Note: Needs platform-dependent factoring.
2368 bool status = true;
2369
2370 if (TLABRefillWasteFraction == 0) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "TLABRefillWasteFraction should be a denominator, "
2373 "not " SIZE_FORMAT "\n",
2374 TLABRefillWasteFraction);
2375 status = false;
2376 }
2377
2378 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2379 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2380 }
2381
2382 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2383 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2384 }
2385
2386 if (GCTimeLimit == 100) {
2387 // Turn off gc-overhead-limit-exceeded checks
2388 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2389 }
2390
2391 status = status && check_gc_consistency();
2392
2393 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2394 // insists that we hold the requisite locks so that the iteration is
2395 // MT-safe. For the verification at start-up and shut-down, we don't
2396 // yet have a good way of acquiring and releasing these locks,
2397 // which are not visible at the CollectedHeap level. We want to
2398 // be able to acquire these locks and then do the iteration rather
2399 // than just disable the lock verification. This will be fixed under
2400 // bug 4788986.
2401 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2402 if (VerifyDuringStartup) {
2403 warning("Heap verification at start-up disabled "
2404 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2405 VerifyDuringStartup = false; // Disable verification at start-up
2406 }
2407
2408 if (VerifyBeforeExit) {
2409 warning("Heap verification at shutdown disabled "
2410 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2411 VerifyBeforeExit = false; // Disable verification at shutdown
2412 }
2413 }
2414
2415 if (PrintNMTStatistics) {
2416 #if INCLUDE_NMT
2417 if (MemTracker::tracking_level() == NMT_off) {
2418 #endif // INCLUDE_NMT
2419 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2420 PrintNMTStatistics = false;
2421 #if INCLUDE_NMT
2422 }
2423 #endif
2424 }
2425 #if INCLUDE_JVMCI
2426
2427 status = status && check_jvmci_args_consistency();
2428
2429 if (EnableJVMCI) {
2430 if (!ScavengeRootsInCode) {
2431 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2432 ScavengeRootsInCode = 1;
2433 }
2434 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2435 TypeProfileLevel = 0;
2436 }
2437 if (UseJVMCICompiler) {
2438 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2439 TypeProfileWidth = 8;
2440 }
2441 }
2442 }
2443 #endif
2444
2445 // Check lower bounds of the code cache
2446 // Template Interpreter code is approximately 3X larger in debug builds.
2447 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2448 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2449 jio_fprintf(defaultStream::error_stream(),
2450 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2451 os::vm_page_size()/K);
2452 status = false;
2453 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2456 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2457 status = false;
2458 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2461 min_code_cache_size/K);
2462 status = false;
2463 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2464 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2467 CODE_CACHE_SIZE_LIMIT/M);
2468 status = false;
2469 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2472 min_code_cache_size/K);
2473 status = false;
2474 }
2475
2476 #ifdef _LP64
2477 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2478 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2479 }
2480 #endif
2481
2482 #ifndef SUPPORT_RESERVED_STACK_AREA
2483 if (StackReservedPages != 0) {
2484 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2485 warning("Reserved Stack Area not supported on this platform");
2486 }
2487 #endif
2488
2489 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2490 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2491 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2492 }
2493 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2494 }
2495 if (UseCompiler && is_interpreter_only()) {
2496 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2497 warning("UseCompiler disabled due to -Xint.");
2498 }
2499 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2500 }
2501 #ifdef COMPILER2
2502 if (PostLoopMultiversioning && !RangeCheckElimination) {
2503 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2504 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2505 }
2506 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2507 }
2508 #endif
2509 return status;
2510 }
2511
2512 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2513 const char* option_type) {
2514 if (ignore) return false;
2515
2516 const char* spacer = " ";
2517 if (option_type == NULL) {
2518 option_type = ++spacer; // Set both to the empty string.
2519 }
2520
2521 if (os::obsolete_option(option)) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Obsolete %s%soption: %s\n", option_type, spacer,
2524 option->optionString);
2525 return false;
2526 } else {
2527 jio_fprintf(defaultStream::error_stream(),
2528 "Unrecognized %s%soption: %s\n", option_type, spacer,
2529 option->optionString);
2530 return true;
2531 }
2532 }
2533
2534 static const char* user_assertion_options[] = {
2535 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2536 };
2537
2538 static const char* system_assertion_options[] = {
2539 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2540 };
2541
2542 bool Arguments::parse_uintx(const char* value,
2543 uintx* uintx_arg,
2544 uintx min_size) {
2545
2546 // Check the sign first since atojulong() parses only unsigned values.
2547 bool value_is_positive = !(*value == '-');
2548
2549 if (value_is_positive) {
2550 julong n;
2551 bool good_return = atojulong(value, &n);
2552 if (good_return) {
2553 bool above_minimum = n >= min_size;
2554 bool value_is_too_large = n > max_uintx;
2555
2556 if (above_minimum && !value_is_too_large) {
2557 *uintx_arg = n;
2558 return true;
2559 }
2560 }
2561 }
2562 return false;
2563 }
2564
2565 unsigned int addreads_count = 0;
2566 unsigned int addexports_count = 0;
2567 unsigned int addmods_count = 0;
2568 unsigned int patch_mod_count = 0;
2569
2570 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2571 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2572 char* property = AllocateHeap(prop_len, mtArguments);
2573 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2574 if (ret < 0 || ret >= (int)prop_len) {
2575 FreeHeap(property);
2576 return false;
2577 }
2578 bool added = add_property(property, UnwriteableProperty, internal);
2579 FreeHeap(property);
2580 return added;
2581 }
2582
2583 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2584 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2585 if (count < 1000) {
2586 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2587 char* property = AllocateHeap(prop_len, mtArguments);
2588 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2589 if (ret < 0 || ret >= (int)prop_len) {
2590 FreeHeap(property);
2591 return false;
2592 }
2593 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2594 FreeHeap(property);
2595 return added;
2596 }
2597 return false;
2598 }
2599
2600 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2601 julong* long_arg,
2602 julong min_size) {
2603 if (!atojulong(s, long_arg)) return arg_unreadable;
2604 return check_memory_size(*long_arg, min_size);
2605 }
2606
2607 // Parse JavaVMInitArgs structure
2608
2609 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2610 const JavaVMInitArgs *java_options_args,
2611 const JavaVMInitArgs *cmd_line_args) {
2612 bool patch_mod_javabase = false;
2613
2614 // Save default settings for some mode flags
2615 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2616 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2617 Arguments::_ClipInlining = ClipInlining;
2618 Arguments::_BackgroundCompilation = BackgroundCompilation;
2619 if (TieredCompilation) {
2620 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2621 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2622 }
2623
2624 // Setup flags for mixed which is the default
2625 set_mode_flags(_mixed);
2626
2627 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2628 // variable (if present).
2629 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2630 if (result != JNI_OK) {
2631 return result;
2632 }
2633
2634 // Parse args structure generated from the command line flags.
2635 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2636 if (result != JNI_OK) {
2637 return result;
2638 }
2639
2640 // Parse args structure generated from the _JAVA_OPTIONS environment
2641 // variable (if present) (mimics classic VM)
2642 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2643 if (result != JNI_OK) {
2644 return result;
2645 }
2646
2647 // Do final processing now that all arguments have been parsed
2648 result = finalize_vm_init_args();
2649 if (result != JNI_OK) {
2650 return result;
2651 }
2652
2653 return JNI_OK;
2654 }
2655
2656 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2657 // represents a valid JDWP agent. is_path==true denotes that we
2658 // are dealing with -agentpath (case where name is a path), otherwise with
2659 // -agentlib
2660 bool valid_jdwp_agent(char *name, bool is_path) {
2661 char *_name;
2662 const char *_jdwp = "jdwp";
2663 size_t _len_jdwp, _len_prefix;
2664
2665 if (is_path) {
2666 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2667 return false;
2668 }
2669
2670 _name++; // skip past last path separator
2671 _len_prefix = strlen(JNI_LIB_PREFIX);
2672
2673 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2674 return false;
2675 }
2676
2677 _name += _len_prefix;
2678 _len_jdwp = strlen(_jdwp);
2679
2680 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2681 _name += _len_jdwp;
2682 }
2683 else {
2684 return false;
2685 }
2686
2687 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2688 return false;
2689 }
2690
2691 return true;
2692 }
2693
2694 if (strcmp(name, _jdwp) == 0) {
2695 return true;
2696 }
2697
2698 return false;
2699 }
2700
2701 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2702 // --patch-module=<module>=<file>(<pathsep><file>)*
2703 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2704 // Find the equal sign between the module name and the path specification
2705 const char* module_equal = strchr(patch_mod_tail, '=');
2706 if (module_equal == NULL) {
2707 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2708 return JNI_ERR;
2709 } else {
2710 // Pick out the module name
2711 size_t module_len = module_equal - patch_mod_tail;
2712 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2713 if (module_name != NULL) {
2714 memcpy(module_name, patch_mod_tail, module_len);
2715 *(module_name + module_len) = '\0';
2716 // The path piece begins one past the module_equal sign
2717 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2718 FREE_C_HEAP_ARRAY(char, module_name);
2719 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2720 return JNI_ENOMEM;
2721 }
2722 } else {
2723 return JNI_ENOMEM;
2724 }
2725 }
2726 return JNI_OK;
2727 }
2728
2729 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2730 // For match_option to return remaining or value part of option string
2731 const char* tail;
2732
2733 // iterate over arguments
2734 for (int index = 0; index < args->nOptions; index++) {
2735 bool is_absolute_path = false; // for -agentpath vs -agentlib
2736
2737 const JavaVMOption* option = args->options + index;
2738
2739 if (!match_option(option, "-Djava.class.path", &tail) &&
2740 !match_option(option, "-Dsun.java.command", &tail) &&
2741 !match_option(option, "-Dsun.java.launcher", &tail)) {
2742
2743 // add all jvm options to the jvm_args string. This string
2744 // is used later to set the java.vm.args PerfData string constant.
2745 // the -Djava.class.path and the -Dsun.java.command options are
2746 // omitted from jvm_args string as each have their own PerfData
2747 // string constant object.
2748 build_jvm_args(option->optionString);
2749 }
2750
2751 // -verbose:[class/gc/jni]
2752 if (match_option(option, "-verbose", &tail)) {
2753 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2754 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2755 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2756 } else if (!strcmp(tail, ":gc")) {
2757 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2758 } else if (!strcmp(tail, ":jni")) {
2759 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 }
2763 // -da / -ea / -disableassertions / -enableassertions
2764 // These accept an optional class/package name separated by a colon, e.g.,
2765 // -da:java.lang.Thread.
2766 } else if (match_option(option, user_assertion_options, &tail, true)) {
2767 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2768 if (*tail == '\0') {
2769 JavaAssertions::setUserClassDefault(enable);
2770 } else {
2771 assert(*tail == ':', "bogus match by match_option()");
2772 JavaAssertions::addOption(tail + 1, enable);
2773 }
2774 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2775 } else if (match_option(option, system_assertion_options, &tail, false)) {
2776 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2777 JavaAssertions::setSystemClassDefault(enable);
2778 // -bootclasspath:
2779 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2780 jio_fprintf(defaultStream::output_stream(),
2781 "-Xbootclasspath is no longer a supported option.\n");
2782 return JNI_EINVAL;
2783 // -bootclasspath/a:
2784 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2785 Arguments::append_sysclasspath(tail);
2786 // -bootclasspath/p:
2787 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2788 jio_fprintf(defaultStream::output_stream(),
2789 "-Xbootclasspath/p is no longer a supported option.\n");
2790 return JNI_EINVAL;
2791 // -Xrun
2792 } else if (match_option(option, "-Xrun", &tail)) {
2793 if (tail != NULL) {
2794 const char* pos = strchr(tail, ':');
2795 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2796 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2797 jio_snprintf(name, len + 1, "%s", tail);
2798
2799 char *options = NULL;
2800 if(pos != NULL) {
2801 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2802 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2803 }
2804 #if !INCLUDE_JVMTI
2805 if (strcmp(name, "jdwp") == 0) {
2806 jio_fprintf(defaultStream::error_stream(),
2807 "Debugging agents are not supported in this VM\n");
2808 return JNI_ERR;
2809 }
2810 #endif // !INCLUDE_JVMTI
2811 add_init_library(name, options);
2812 }
2813 } else if (match_option(option, "--add-reads=", &tail)) {
2814 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2815 return JNI_ENOMEM;
2816 }
2817 } else if (match_option(option, "--add-exports=", &tail)) {
2818 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2819 return JNI_ENOMEM;
2820 }
2821 } else if (match_option(option, "--add-modules=", &tail)) {
2822 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2823 return JNI_ENOMEM;
2824 }
2825 } else if (match_option(option, "--limit-modules=", &tail)) {
2826 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2827 return JNI_ENOMEM;
2828 }
2829 } else if (match_option(option, "--module-path=", &tail)) {
2830 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2831 return JNI_ENOMEM;
2832 }
2833 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2834 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2835 return JNI_ENOMEM;
2836 }
2837 } else if (match_option(option, "--patch-module=", &tail)) {
2838 // --patch-module=<module>=<file>(<pathsep><file>)*
2839 int res = process_patch_mod_option(tail, patch_mod_javabase);
2840 if (res != JNI_OK) {
2841 return res;
2842 }
2843 // -agentlib and -agentpath
2844 } else if (match_option(option, "-agentlib:", &tail) ||
2845 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2846 if(tail != NULL) {
2847 const char* pos = strchr(tail, '=');
2848 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2849 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2850 name[len] = '\0';
2851
2852 char *options = NULL;
2853 if(pos != NULL) {
2854 options = os::strdup_check_oom(pos + 1, mtArguments);
2855 }
2856 #if !INCLUDE_JVMTI
2857 if (valid_jdwp_agent(name, is_absolute_path)) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Debugging agents are not supported in this VM\n");
2860 return JNI_ERR;
2861 }
2862 #endif // !INCLUDE_JVMTI
2863 add_init_agent(name, options, is_absolute_path);
2864 }
2865 // -javaagent
2866 } else if (match_option(option, "-javaagent:", &tail)) {
2867 #if !INCLUDE_JVMTI
2868 jio_fprintf(defaultStream::error_stream(),
2869 "Instrumentation agents are not supported in this VM\n");
2870 return JNI_ERR;
2871 #else
2872 if (tail != NULL) {
2873 size_t length = strlen(tail) + 1;
2874 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2875 jio_snprintf(options, length, "%s", tail);
2876 add_init_agent("instrument", options, false);
2877 // java agents need module java.instrument
2878 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
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 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2894 // -Xnoconcgc
2895 } else if (match_option(option, "-Xnoconcgc")) {
2896 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2900 // -Xbatch
2901 } else if (match_option(option, "-Xbatch")) {
2902 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 // -Xmn for compatibility with other JVM vendors
2906 } else if (match_option(option, "-Xmn", &tail)) {
2907 julong long_initial_young_size = 0;
2908 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2909 if (errcode != arg_in_range) {
2910 jio_fprintf(defaultStream::error_stream(),
2911 "Invalid initial young generation size: %s\n", option->optionString);
2912 describe_range_error(errcode);
2913 return JNI_EINVAL;
2914 }
2915 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 // -Xms
2922 } else if (match_option(option, "-Xms", &tail)) {
2923 julong long_initial_heap_size = 0;
2924 // an initial heap size of 0 means automatically determine
2925 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2926 if (errcode != arg_in_range) {
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Invalid initial heap size: %s\n", option->optionString);
2929 describe_range_error(errcode);
2930 return JNI_EINVAL;
2931 }
2932 set_min_heap_size((size_t)long_initial_heap_size);
2933 // Currently the minimum size and the initial heap sizes are the same.
2934 // Can be overridden with -XX:InitialHeapSize.
2935 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2936 return JNI_EINVAL;
2937 }
2938 // -Xmx
2939 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2940 julong long_max_heap_size = 0;
2941 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2942 if (errcode != arg_in_range) {
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Invalid maximum heap size: %s\n", option->optionString);
2945 describe_range_error(errcode);
2946 return JNI_EINVAL;
2947 }
2948 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 // Xmaxf
2952 } else if (match_option(option, "-Xmaxf", &tail)) {
2953 char* err;
2954 int maxf = (int)(strtod(tail, &err) * 100);
2955 if (*err != '\0' || *tail == '\0') {
2956 jio_fprintf(defaultStream::error_stream(),
2957 "Bad max heap free percentage size: %s\n",
2958 option->optionString);
2959 return JNI_EINVAL;
2960 } else {
2961 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 }
2965 // Xminf
2966 } else if (match_option(option, "-Xminf", &tail)) {
2967 char* err;
2968 int minf = (int)(strtod(tail, &err) * 100);
2969 if (*err != '\0' || *tail == '\0') {
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Bad min heap free percentage size: %s\n",
2972 option->optionString);
2973 return JNI_EINVAL;
2974 } else {
2975 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978 }
2979 // -Xss
2980 } else if (match_option(option, "-Xss", &tail)) {
2981 julong long_ThreadStackSize = 0;
2982 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2983 if (errcode != arg_in_range) {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "Invalid thread stack size: %s\n", option->optionString);
2986 describe_range_error(errcode);
2987 return JNI_EINVAL;
2988 }
2989 // Internally track ThreadStackSize in units of 1024 bytes.
2990 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2991 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2995 } else if (match_option(option, "-Xoss", &tail) ||
2996 match_option(option, "-Xsqnopause") ||
2997 match_option(option, "-Xoptimize") ||
2998 match_option(option, "-Xboundthreads") ||
2999 match_option(option, "-Xusealtsigs")) {
3000 // All these options are deprecated in JDK 9 and will be removed in a future release
3001 char version[256];
3002 JDK_Version::jdk(9).to_string(version, sizeof(version));
3003 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3004 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3005 julong long_CodeCacheExpansionSize = 0;
3006 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3007 if (errcode != arg_in_range) {
3008 jio_fprintf(defaultStream::error_stream(),
3009 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3010 os::vm_page_size()/K);
3011 return JNI_EINVAL;
3012 }
3013 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3017 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3018 julong long_ReservedCodeCacheSize = 0;
3019
3020 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3021 if (errcode != arg_in_range) {
3022 jio_fprintf(defaultStream::error_stream(),
3023 "Invalid maximum code cache size: %s.\n", option->optionString);
3024 return JNI_EINVAL;
3025 }
3026 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 // -XX:NonNMethodCodeHeapSize=
3030 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3031 julong long_NonNMethodCodeHeapSize = 0;
3032
3033 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3034 if (errcode != arg_in_range) {
3035 jio_fprintf(defaultStream::error_stream(),
3036 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 // -XX:ProfiledCodeHeapSize=
3043 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3044 julong long_ProfiledCodeHeapSize = 0;
3045
3046 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3047 if (errcode != arg_in_range) {
3048 jio_fprintf(defaultStream::error_stream(),
3049 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3050 return JNI_EINVAL;
3051 }
3052 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 // -XX:NonProfiledCodeHeapSizee=
3056 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3057 julong long_NonProfiledCodeHeapSize = 0;
3058
3059 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3060 if (errcode != arg_in_range) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 // -green
3069 } else if (match_option(option, "-green")) {
3070 jio_fprintf(defaultStream::error_stream(),
3071 "Green threads support not available\n");
3072 return JNI_EINVAL;
3073 // -native
3074 } else if (match_option(option, "-native")) {
3075 // HotSpot always uses native threads, ignore silently for compatibility
3076 // -Xrs
3077 } else if (match_option(option, "-Xrs")) {
3078 // Classic/EVM option, new functionality
3079 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3080 return JNI_EINVAL;
3081 }
3082 // -Xprof
3083 } else if (match_option(option, "-Xprof")) {
3084 #if INCLUDE_FPROF
3085 _has_profile = true;
3086 #else // INCLUDE_FPROF
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Flat profiling is not supported in this VM.\n");
3089 return JNI_ERR;
3090 #endif // INCLUDE_FPROF
3091 // -Xconcurrentio
3092 } else if (match_option(option, "-Xconcurrentio")) {
3093 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3097 return JNI_EINVAL;
3098 }
3099 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3106 return JNI_EINVAL;
3107 }
3108
3109 // -Xinternalversion
3110 } else if (match_option(option, "-Xinternalversion")) {
3111 jio_fprintf(defaultStream::output_stream(), "%s\n",
3112 VM_Version::internal_vm_info_string());
3113 vm_exit(0);
3114 #ifndef PRODUCT
3115 // -Xprintflags
3116 } else if (match_option(option, "-Xprintflags")) {
3117 CommandLineFlags::printFlags(tty, false);
3118 vm_exit(0);
3119 #endif
3120 // -D
3121 } else if (match_option(option, "-D", &tail)) {
3122 const char* value;
3123 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3124 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3125 // abort if -Djava.endorsed.dirs is set
3126 jio_fprintf(defaultStream::output_stream(),
3127 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3128 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3129 return JNI_EINVAL;
3130 }
3131 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3132 *value != '\0' && strcmp(value, "\"\"") != 0) {
3133 // abort if -Djava.ext.dirs is set
3134 jio_fprintf(defaultStream::output_stream(),
3135 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3136 return JNI_EINVAL;
3137 }
3138 // Check for module related properties. They must be set using the modules
3139 // options. For example: use "--add-modules=java.sql", not
3140 // "-Djdk.module.addmods=java.sql"
3141 if (is_internal_module_property(option->optionString + 2)) {
3142 needs_module_property_warning = true;
3143 continue;
3144 }
3145
3146 if (!add_property(tail)) {
3147 return JNI_ENOMEM;
3148 }
3149 // Out of the box management support
3150 if (match_option(option, "-Dcom.sun.management", &tail)) {
3151 #if INCLUDE_MANAGEMENT
3152 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 // management agent in module java.management
3156 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3157 return JNI_ENOMEM;
3158 }
3159 #else
3160 jio_fprintf(defaultStream::output_stream(),
3161 "-Dcom.sun.management is not supported in this VM.\n");
3162 return JNI_ERR;
3163 #endif
3164 }
3165 // -Xint
3166 } else if (match_option(option, "-Xint")) {
3167 set_mode_flags(_int);
3168 // -Xmixed
3169 } else if (match_option(option, "-Xmixed")) {
3170 set_mode_flags(_mixed);
3171 // -Xcomp
3172 } else if (match_option(option, "-Xcomp")) {
3173 // for testing the compiler; turn off all flags that inhibit compilation
3174 set_mode_flags(_comp);
3175 // -Xshare:dump
3176 } else if (match_option(option, "-Xshare:dump")) {
3177 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 set_mode_flags(_int); // Prevent compilation, which creates objects
3181 // -Xshare:on
3182 } else if (match_option(option, "-Xshare:on")) {
3183 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 // -Xshare:auto
3190 } else if (match_option(option, "-Xshare:auto")) {
3191 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 // -Xshare:off
3198 } else if (match_option(option, "-Xshare:off")) {
3199 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3203 return JNI_EINVAL;
3204 }
3205 // -Xverify
3206 } else if (match_option(option, "-Xverify", &tail)) {
3207 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3208 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 } else if (strcmp(tail, ":remote") == 0) {
3215 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3219 return JNI_EINVAL;
3220 }
3221 } else if (strcmp(tail, ":none") == 0) {
3222 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3223 return JNI_EINVAL;
3224 }
3225 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3226 return JNI_EINVAL;
3227 }
3228 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3229 return JNI_EINVAL;
3230 }
3231 // -Xdebug
3232 } else if (match_option(option, "-Xdebug")) {
3233 // note this flag has been used, then ignore
3234 set_xdebug_mode(true);
3235 // -Xnoagent
3236 } else if (match_option(option, "-Xnoagent")) {
3237 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3238 } else if (match_option(option, "-Xloggc:", &tail)) {
3239 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3240 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3241 _gc_log_filename = os::strdup_check_oom(tail);
3242 } else if (match_option(option, "-Xlog", &tail)) {
3243 bool ret = false;
3244 if (strcmp(tail, ":help") == 0) {
3245 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3246 vm_exit(0);
3247 } else if (strcmp(tail, ":disable") == 0) {
3248 LogConfiguration::disable_logging();
3249 ret = true;
3250 } else if (*tail == '\0') {
3251 ret = LogConfiguration::parse_command_line_arguments();
3252 assert(ret, "-Xlog without arguments should never fail to parse");
3253 } else if (*tail == ':') {
3254 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3255 }
3256 if (ret == false) {
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Invalid -Xlog option '-Xlog%s'\n",
3259 tail);
3260 return JNI_EINVAL;
3261 }
3262 // JNI hooks
3263 } else if (match_option(option, "-Xcheck", &tail)) {
3264 if (!strcmp(tail, ":jni")) {
3265 #if !INCLUDE_JNI_CHECK
3266 warning("JNI CHECKING is not supported in this VM");
3267 #else
3268 CheckJNICalls = true;
3269 #endif // INCLUDE_JNI_CHECK
3270 } else if (is_bad_option(option, args->ignoreUnrecognized,
3271 "check")) {
3272 return JNI_EINVAL;
3273 }
3274 } else if (match_option(option, "vfprintf")) {
3275 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3276 } else if (match_option(option, "exit")) {
3277 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3278 } else if (match_option(option, "abort")) {
3279 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3280 // -XX:+AggressiveHeap
3281 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3282 jint result = set_aggressive_heap_flags();
3283 if (result != JNI_OK) {
3284 return result;
3285 }
3286 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3287 // and the last option wins.
3288 } else if (match_option(option, "-XX:+NeverTenure")) {
3289 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3296 return JNI_EINVAL;
3297 }
3298 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3299 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3300 return JNI_EINVAL;
3301 }
3302 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3303 return JNI_EINVAL;
3304 }
3305 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3309 uintx max_tenuring_thresh = 0;
3310 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3311 jio_fprintf(defaultStream::error_stream(),
3312 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3313 return JNI_EINVAL;
3314 }
3315
3316 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3317 return JNI_EINVAL;
3318 }
3319
3320 if (MaxTenuringThreshold == 0) {
3321 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3322 return JNI_EINVAL;
3323 }
3324 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3325 return JNI_EINVAL;
3326 }
3327 } else {
3328 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3329 return JNI_EINVAL;
3330 }
3331 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3332 return JNI_EINVAL;
3333 }
3334 }
3335 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3336 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3337 return JNI_EINVAL;
3338 }
3339 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3340 return JNI_EINVAL;
3341 }
3342 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3343 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3344 return JNI_EINVAL;
3345 }
3346 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3347 return JNI_EINVAL;
3348 }
3349 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3350 #if defined(DTRACE_ENABLED)
3351 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3352 return JNI_EINVAL;
3353 }
3354 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3355 return JNI_EINVAL;
3356 }
3357 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3358 return JNI_EINVAL;
3359 }
3360 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3361 return JNI_EINVAL;
3362 }
3363 #else // defined(DTRACE_ENABLED)
3364 jio_fprintf(defaultStream::error_stream(),
3365 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3366 return JNI_EINVAL;
3367 #endif // defined(DTRACE_ENABLED)
3368 #ifdef ASSERT
3369 } else if (match_option(option, "-XX:+FullGCALot")) {
3370 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3371 return JNI_EINVAL;
3372 }
3373 // disable scavenge before parallel mark-compact
3374 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 #endif
3378 #if !INCLUDE_MANAGEMENT
3379 } else if (match_option(option, "-XX:+ManagementServer")) {
3380 jio_fprintf(defaultStream::error_stream(),
3381 "ManagementServer is not supported in this VM.\n");
3382 return JNI_ERR;
3383 #endif // INCLUDE_MANAGEMENT
3384 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3385 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3386 // already been handled
3387 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3388 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3389 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3390 return JNI_EINVAL;
3391 }
3392 }
3393 // Unknown option
3394 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3395 return JNI_ERR;
3396 }
3397 }
3398
3399 // PrintSharedArchiveAndExit will turn on
3400 // -Xshare:on
3401 // -Xlog:class+path=info
3402 if (PrintSharedArchiveAndExit) {
3403 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3404 return JNI_EINVAL;
3405 }
3406 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3407 return JNI_EINVAL;
3408 }
3409 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3410 }
3411
3412 // Change the default value for flags which have different default values
3413 // when working with older JDKs.
3414 #ifdef LINUX
3415 if (JDK_Version::current().compare_major(6) <= 0 &&
3416 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3417 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3418 }
3419 #endif // LINUX
3420 fix_appclasspath();
3421 return JNI_OK;
3422 }
3423
3424 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3425 // For java.base check for duplicate --patch-module options being specified on the command line.
3426 // This check is only required for java.base, all other duplicate module specifications
3427 // will be checked during module system initialization. The module system initialization
3428 // will throw an ExceptionInInitializerError if this situation occurs.
3429 if (strcmp(module_name, "java.base") == 0) {
3430 if (*patch_mod_javabase) {
3431 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3432 } else {
3433 *patch_mod_javabase = true;
3434 }
3435 }
3436
3437 // Create GrowableArray lazily, only if --patch-module has been specified
3438 if (_patch_mod_prefix == NULL) {
3439 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3440 }
3441
3442 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3443 }
3444
3445 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3446 //
3447 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3448 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3449 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3450 // path is treated as the current directory.
3451 //
3452 // This causes problems with CDS, which requires that all directories specified in the classpath
3453 // must be empty. In most cases, applications do NOT want to load classes from the current
3454 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3455 // scripts compatible with CDS.
3456 void Arguments::fix_appclasspath() {
3457 if (IgnoreEmptyClassPaths) {
3458 const char separator = *os::path_separator();
3459 const char* src = _java_class_path->value();
3460
3461 // skip over all the leading empty paths
3462 while (*src == separator) {
3463 src ++;
3464 }
3465
3466 char* copy = os::strdup_check_oom(src, mtArguments);
3467
3468 // trim all trailing empty paths
3469 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3470 *tail = '\0';
3471 }
3472
3473 char from[3] = {separator, separator, '\0'};
3474 char to [2] = {separator, '\0'};
3475 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3476 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3477 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3478 }
3479
3480 _java_class_path->set_writeable_value(copy);
3481 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3482 }
3483 }
3484
3485 static bool has_jar_files(const char* directory) {
3486 DIR* dir = os::opendir(directory);
3487 if (dir == NULL) return false;
3488
3489 struct dirent *entry;
3490 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3491 bool hasJarFile = false;
3492 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3493 const char* name = entry->d_name;
3494 const char* ext = name + strlen(name) - 4;
3495 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3496 }
3497 FREE_C_HEAP_ARRAY(char, dbuf);
3498 os::closedir(dir);
3499 return hasJarFile ;
3500 }
3501
3502 static int check_non_empty_dirs(const char* path) {
3503 const char separator = *os::path_separator();
3504 const char* const end = path + strlen(path);
3505 int nonEmptyDirs = 0;
3506 while (path < end) {
3507 const char* tmp_end = strchr(path, separator);
3508 if (tmp_end == NULL) {
3509 if (has_jar_files(path)) {
3510 nonEmptyDirs++;
3511 jio_fprintf(defaultStream::output_stream(),
3512 "Non-empty directory: %s\n", path);
3513 }
3514 path = end;
3515 } else {
3516 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3517 memcpy(dirpath, path, tmp_end - path);
3518 dirpath[tmp_end - path] = '\0';
3519 if (has_jar_files(dirpath)) {
3520 nonEmptyDirs++;
3521 jio_fprintf(defaultStream::output_stream(),
3522 "Non-empty directory: %s\n", dirpath);
3523 }
3524 FREE_C_HEAP_ARRAY(char, dirpath);
3525 path = tmp_end + 1;
3526 }
3527 }
3528 return nonEmptyDirs;
3529 }
3530
3531 jint Arguments::finalize_vm_init_args() {
3532 // check if the default lib/endorsed directory exists; if so, error
3533 char path[JVM_MAXPATHLEN];
3534 const char* fileSep = os::file_separator();
3535 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3536
3537 if (CheckEndorsedAndExtDirs) {
3538 int nonEmptyDirs = 0;
3539 // check endorsed directory
3540 nonEmptyDirs += check_non_empty_dirs(path);
3541 // check the extension directories
3542 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3543 if (nonEmptyDirs > 0) {
3544 return JNI_ERR;
3545 }
3546 }
3547
3548 DIR* dir = os::opendir(path);
3549 if (dir != NULL) {
3550 jio_fprintf(defaultStream::output_stream(),
3551 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3552 "in modular form will be supported via the concept of upgradeable modules.\n");
3553 os::closedir(dir);
3554 return JNI_ERR;
3555 }
3556
3557 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3558 dir = os::opendir(path);
3559 if (dir != NULL) {
3560 jio_fprintf(defaultStream::output_stream(),
3561 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3562 "Use -classpath instead.\n.");
3563 os::closedir(dir);
3564 return JNI_ERR;
3565 }
3566
3567 // This must be done after all arguments have been processed.
3568 // java_compiler() true means set to "NONE" or empty.
3569 if (java_compiler() && !xdebug_mode()) {
3570 // For backwards compatibility, we switch to interpreted mode if
3571 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3572 // not specified.
3573 set_mode_flags(_int);
3574 }
3575
3576 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3577 // but like -Xint, leave compilation thresholds unaffected.
3578 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3579 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3580 set_mode_flags(_int);
3581 }
3582
3583 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3584 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3585 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3586 }
3587
3588 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3589 // Don't degrade server performance for footprint
3590 if (FLAG_IS_DEFAULT(UseLargePages) &&
3591 MaxHeapSize < LargePageHeapSizeThreshold) {
3592 // No need for large granularity pages w/small heaps.
3593 // Note that large pages are enabled/disabled for both the
3594 // Java heap and the code cache.
3595 FLAG_SET_DEFAULT(UseLargePages, false);
3596 }
3597
3598 #elif defined(COMPILER2)
3599 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3600 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3601 }
3602 #endif
3603
3604 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3605 UNSUPPORTED_OPTION(ProfileInterpreter);
3606 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3607 #endif
3608
3609 #ifndef TIERED
3610 // Tiered compilation is undefined.
3611 UNSUPPORTED_OPTION(TieredCompilation);
3612 #endif
3613
3614 #if INCLUDE_JVMCI
3615 if (EnableJVMCI &&
3616 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3617 return JNI_ENOMEM;
3618 }
3619 #endif
3620
3621 // If we are running in a headless jre, force java.awt.headless property
3622 // to be true unless the property has already been set.
3623 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3624 if (os::is_headless_jre()) {
3625 const char* headless = Arguments::get_property("java.awt.headless");
3626 if (headless == NULL) {
3627 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3628 if (headless_env == NULL) {
3629 if (!add_property("java.awt.headless=true")) {
3630 return JNI_ENOMEM;
3631 }
3632 } else {
3633 char buffer[256];
3634 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3635 if (!add_property(buffer)) {
3636 return JNI_ENOMEM;
3637 }
3638 }
3639 }
3640 }
3641
3642 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3643 // CMS can only be used with ParNew
3644 FLAG_SET_ERGO(bool, UseParNewGC, true);
3645 }
3646
3647 if (!check_vm_args_consistency()) {
3648 return JNI_ERR;
3649 }
3650
3651 return JNI_OK;
3652 }
3653
3654 // Helper class for controlling the lifetime of JavaVMInitArgs
3655 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3656 // deleted on the destruction of the ScopedVMInitArgs object.
3657 class ScopedVMInitArgs : public StackObj {
3658 private:
3659 JavaVMInitArgs _args;
3660 char* _container_name;
3661 bool _is_set;
3662 char* _vm_options_file_arg;
3663
3664 public:
3665 ScopedVMInitArgs(const char *container_name) {
3666 _args.version = JNI_VERSION_1_2;
3667 _args.nOptions = 0;
3668 _args.options = NULL;
3669 _args.ignoreUnrecognized = false;
3670 _container_name = (char *)container_name;
3671 _is_set = false;
3672 _vm_options_file_arg = NULL;
3673 }
3674
3675 // Populates the JavaVMInitArgs object represented by this
3676 // ScopedVMInitArgs object with the arguments in options. The
3677 // allocated memory is deleted by the destructor. If this method
3678 // returns anything other than JNI_OK, then this object is in a
3679 // partially constructed state, and should be abandoned.
3680 jint set_args(GrowableArray<JavaVMOption>* options) {
3681 _is_set = true;
3682 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3683 JavaVMOption, options->length(), mtArguments);
3684 if (options_arr == NULL) {
3685 return JNI_ENOMEM;
3686 }
3687 _args.options = options_arr;
3688
3689 for (int i = 0; i < options->length(); i++) {
3690 options_arr[i] = options->at(i);
3691 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3692 if (options_arr[i].optionString == NULL) {
3693 // Rely on the destructor to do cleanup.
3694 _args.nOptions = i;
3695 return JNI_ENOMEM;
3696 }
3697 }
3698
3699 _args.nOptions = options->length();
3700 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3701 return JNI_OK;
3702 }
3703
3704 JavaVMInitArgs* get() { return &_args; }
3705 char* container_name() { return _container_name; }
3706 bool is_set() { return _is_set; }
3707 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3708 char* vm_options_file_arg() { return _vm_options_file_arg; }
3709
3710 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3711 if (_vm_options_file_arg != NULL) {
3712 os::free(_vm_options_file_arg);
3713 }
3714 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3715 }
3716
3717 ~ScopedVMInitArgs() {
3718 if (_vm_options_file_arg != NULL) {
3719 os::free(_vm_options_file_arg);
3720 }
3721 if (_args.options == NULL) return;
3722 for (int i = 0; i < _args.nOptions; i++) {
3723 os::free(_args.options[i].optionString);
3724 }
3725 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3726 }
3727
3728 // Insert options into this option list, to replace option at
3729 // vm_options_file_pos (-XX:VMOptionsFile)
3730 jint insert(const JavaVMInitArgs* args,
3731 const JavaVMInitArgs* args_to_insert,
3732 const int vm_options_file_pos) {
3733 assert(_args.options == NULL, "shouldn't be set yet");
3734 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3735 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3736
3737 int length = args->nOptions + args_to_insert->nOptions - 1;
3738 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3739 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3740 for (int i = 0; i < args->nOptions; i++) {
3741 if (i == vm_options_file_pos) {
3742 // insert the new options starting at the same place as the
3743 // -XX:VMOptionsFile option
3744 for (int j = 0; j < args_to_insert->nOptions; j++) {
3745 options->push(args_to_insert->options[j]);
3746 }
3747 } else {
3748 options->push(args->options[i]);
3749 }
3750 }
3751 // make into options array
3752 jint result = set_args(options);
3753 delete options;
3754 return result;
3755 }
3756 };
3757
3758 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3759 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3760 }
3761
3762 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3763 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3764 }
3765
3766 jint Arguments::parse_options_environment_variable(const char* name,
3767 ScopedVMInitArgs* vm_args) {
3768 char *buffer = ::getenv(name);
3769
3770 // Don't check this environment variable if user has special privileges
3771 // (e.g. unix su command).
3772 if (buffer == NULL || os::have_special_privileges()) {
3773 return JNI_OK;
3774 }
3775
3776 if ((buffer = os::strdup(buffer)) == NULL) {
3777 return JNI_ENOMEM;
3778 }
3779
3780 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3781
3782 os::free(buffer);
3783 return retcode;
3784 }
3785
3786 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3787 // read file into buffer
3788 int fd = ::open(file_name, O_RDONLY);
3789 if (fd < 0) {
3790 jio_fprintf(defaultStream::error_stream(),
3791 "Could not open options file '%s'\n",
3792 file_name);
3793 return JNI_ERR;
3794 }
3795
3796 struct stat stbuf;
3797 int retcode = os::stat(file_name, &stbuf);
3798 if (retcode != 0) {
3799 jio_fprintf(defaultStream::error_stream(),
3800 "Could not stat options file '%s'\n",
3801 file_name);
3802 os::close(fd);
3803 return JNI_ERR;
3804 }
3805
3806 if (stbuf.st_size == 0) {
3807 // tell caller there is no option data and that is ok
3808 os::close(fd);
3809 return JNI_OK;
3810 }
3811
3812 // '+ 1' for NULL termination even with max bytes
3813 size_t bytes_alloc = stbuf.st_size + 1;
3814
3815 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3816 if (NULL == buf) {
3817 jio_fprintf(defaultStream::error_stream(),
3818 "Could not allocate read buffer for options file parse\n");
3819 os::close(fd);
3820 return JNI_ENOMEM;
3821 }
3822
3823 memset(buf, 0, bytes_alloc);
3824
3825 // Fill buffer
3826 // Use ::read() instead of os::read because os::read()
3827 // might do a thread state transition
3828 // and it is too early for that here
3829
3830 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3831 os::close(fd);
3832 if (bytes_read < 0) {
3833 FREE_C_HEAP_ARRAY(char, buf);
3834 jio_fprintf(defaultStream::error_stream(),
3835 "Could not read options file '%s'\n", file_name);
3836 return JNI_ERR;
3837 }
3838
3839 if (bytes_read == 0) {
3840 // tell caller there is no option data and that is ok
3841 FREE_C_HEAP_ARRAY(char, buf);
3842 return JNI_OK;
3843 }
3844
3845 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3846
3847 FREE_C_HEAP_ARRAY(char, buf);
3848 return retcode;
3849 }
3850
3851 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3852 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3853
3854 // some pointers to help with parsing
3855 char *buffer_end = buffer + buf_len;
3856 char *opt_hd = buffer;
3857 char *wrt = buffer;
3858 char *rd = buffer;
3859
3860 // parse all options
3861 while (rd < buffer_end) {
3862 // skip leading white space from the input string
3863 while (rd < buffer_end && isspace(*rd)) {
3864 rd++;
3865 }
3866
3867 if (rd >= buffer_end) {
3868 break;
3869 }
3870
3871 // Remember this is where we found the head of the token.
3872 opt_hd = wrt;
3873
3874 // Tokens are strings of non white space characters separated
3875 // by one or more white spaces.
3876 while (rd < buffer_end && !isspace(*rd)) {
3877 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3878 int quote = *rd; // matching quote to look for
3879 rd++; // don't copy open quote
3880 while (rd < buffer_end && *rd != quote) {
3881 // include everything (even spaces)
3882 // up until the close quote
3883 *wrt++ = *rd++; // copy to option string
3884 }
3885
3886 if (rd < buffer_end) {
3887 rd++; // don't copy close quote
3888 } else {
3889 // did not see closing quote
3890 jio_fprintf(defaultStream::error_stream(),
3891 "Unmatched quote in %s\n", name);
3892 delete options;
3893 return JNI_ERR;
3894 }
3895 } else {
3896 *wrt++ = *rd++; // copy to option string
3897 }
3898 }
3899
3900 // steal a white space character and set it to NULL
3901 *wrt++ = '\0';
3902 // We now have a complete token
3903
3904 JavaVMOption option;
3905 option.optionString = opt_hd;
3906 option.extraInfo = NULL;
3907
3908 options->append(option); // Fill in option
3909
3910 rd++; // Advance to next character
3911 }
3912
3913 // Fill out JavaVMInitArgs structure.
3914 jint status = vm_args->set_args(options);
3915
3916 delete options;
3917 return status;
3918 }
3919
3920 void Arguments::set_shared_spaces_flags() {
3921 if (DumpSharedSpaces) {
3922 if (FailOverToOldVerifier) {
3923 // Don't fall back to the old verifier on verification failure. If a
3924 // class fails verification with the split verifier, it might fail the
3925 // CDS runtime verifier constraint check. In that case, we don't want
3926 // to share the class. We only archive classes that pass the split verifier.
3927 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3928 }
3929
3930 if (RequireSharedSpaces) {
3931 warning("Cannot dump shared archive while using shared archive");
3932 }
3933 UseSharedSpaces = false;
3934 #ifdef _LP64
3935 if (!UseCompressedOops || !UseCompressedClassPointers) {
3936 vm_exit_during_initialization(
3937 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3938 }
3939 } else {
3940 if (!UseCompressedOops || !UseCompressedClassPointers) {
3941 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3942 }
3943 #endif
3944 }
3945 }
3946
3947 // Sharing support
3948 // Construct the path to the archive
3949 static char* get_shared_archive_path() {
3950 char *shared_archive_path;
3951 if (SharedArchiveFile == NULL) {
3952 char jvm_path[JVM_MAXPATHLEN];
3953 os::jvm_path(jvm_path, sizeof(jvm_path));
3954 char *end = strrchr(jvm_path, *os::file_separator());
3955 if (end != NULL) *end = '\0';
3956 size_t jvm_path_len = strlen(jvm_path);
3957 size_t file_sep_len = strlen(os::file_separator());
3958 const size_t len = jvm_path_len + file_sep_len + 20;
3959 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3960 if (shared_archive_path != NULL) {
3961 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3962 jvm_path, os::file_separator());
3963 }
3964 } else {
3965 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3966 }
3967 return shared_archive_path;
3968 }
3969
3970 #ifndef PRODUCT
3971 // Determine whether LogVMOutput should be implicitly turned on.
3972 static bool use_vm_log() {
3973 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3974 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3975 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3976 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3977 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3978 return true;
3979 }
3980
3981 #ifdef COMPILER1
3982 if (PrintC1Statistics) {
3983 return true;
3984 }
3985 #endif // COMPILER1
3986
3987 #ifdef COMPILER2
3988 if (PrintOptoAssembly || PrintOptoStatistics) {
3989 return true;
3990 }
3991 #endif // COMPILER2
3992
3993 return false;
3994 }
3995
3996 #endif // PRODUCT
3997
3998 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3999 for (int index = 0; index < args->nOptions; index++) {
4000 const JavaVMOption* option = args->options + index;
4001 const char* tail;
4002 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4003 return true;
4004 }
4005 }
4006 return false;
4007 }
4008
4009 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4010 const char* vm_options_file,
4011 const int vm_options_file_pos,
4012 ScopedVMInitArgs* vm_options_file_args,
4013 ScopedVMInitArgs* args_out) {
4014 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4015 if (code != JNI_OK) {
4016 return code;
4017 }
4018
4019 if (vm_options_file_args->get()->nOptions < 1) {
4020 return JNI_OK;
4021 }
4022
4023 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4024 jio_fprintf(defaultStream::error_stream(),
4025 "A VM options file may not refer to a VM options file. "
4026 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4027 "options file '%s' in options container '%s' is an error.\n",
4028 vm_options_file_args->vm_options_file_arg(),
4029 vm_options_file_args->container_name());
4030 return JNI_EINVAL;
4031 }
4032
4033 return args_out->insert(args, vm_options_file_args->get(),
4034 vm_options_file_pos);
4035 }
4036
4037 // Expand -XX:VMOptionsFile found in args_in as needed.
4038 // mod_args and args_out parameters may return values as needed.
4039 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4040 ScopedVMInitArgs* mod_args,
4041 JavaVMInitArgs** args_out) {
4042 jint code = match_special_option_and_act(args_in, mod_args);
4043 if (code != JNI_OK) {
4044 return code;
4045 }
4046
4047 if (mod_args->is_set()) {
4048 // args_in contains -XX:VMOptionsFile and mod_args contains the
4049 // original options from args_in along with the options expanded
4050 // from the VMOptionsFile. Return a short-hand to the caller.
4051 *args_out = mod_args->get();
4052 } else {
4053 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4054 }
4055 return JNI_OK;
4056 }
4057
4058 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4059 ScopedVMInitArgs* args_out) {
4060 // Remaining part of option string
4061 const char* tail;
4062 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4063
4064 for (int index = 0; index < args->nOptions; index++) {
4065 const JavaVMOption* option = args->options + index;
4066 if (ArgumentsExt::process_options(option)) {
4067 continue;
4068 }
4069 if (match_option(option, "-XX:Flags=", &tail)) {
4070 Arguments::set_jvm_flags_file(tail);
4071 continue;
4072 }
4073 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4074 if (vm_options_file_args.found_vm_options_file_arg()) {
4075 jio_fprintf(defaultStream::error_stream(),
4076 "The option '%s' is already specified in the options "
4077 "container '%s' so the specification of '%s' in the "
4078 "same options container is an error.\n",
4079 vm_options_file_args.vm_options_file_arg(),
4080 vm_options_file_args.container_name(),
4081 option->optionString);
4082 return JNI_EINVAL;
4083 }
4084 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4085 // If there's a VMOptionsFile, parse that
4086 jint code = insert_vm_options_file(args, tail, index,
4087 &vm_options_file_args, args_out);
4088 if (code != JNI_OK) {
4089 return code;
4090 }
4091 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4092 if (args_out->is_set()) {
4093 // The VMOptions file inserted some options so switch 'args'
4094 // to the new set of options, and continue processing which
4095 // preserves "last option wins" semantics.
4096 args = args_out->get();
4097 // The first option from the VMOptionsFile replaces the
4098 // current option. So we back track to process the
4099 // replacement option.
4100 index--;
4101 }
4102 continue;
4103 }
4104 if (match_option(option, "-XX:+PrintVMOptions")) {
4105 PrintVMOptions = true;
4106 continue;
4107 }
4108 if (match_option(option, "-XX:-PrintVMOptions")) {
4109 PrintVMOptions = false;
4110 continue;
4111 }
4112 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4113 IgnoreUnrecognizedVMOptions = true;
4114 continue;
4115 }
4116 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4117 IgnoreUnrecognizedVMOptions = false;
4118 continue;
4119 }
4120 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4121 CommandLineFlags::printFlags(tty, false);
4122 vm_exit(0);
4123 }
4124 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4125 #if INCLUDE_NMT
4126 // The launcher did not setup nmt environment variable properly.
4127 if (!MemTracker::check_launcher_nmt_support(tail)) {
4128 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4129 }
4130
4131 // Verify if nmt option is valid.
4132 if (MemTracker::verify_nmt_option()) {
4133 // Late initialization, still in single-threaded mode.
4134 if (MemTracker::tracking_level() >= NMT_summary) {
4135 MemTracker::init();
4136 }
4137 } else {
4138 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4139 }
4140 continue;
4141 #else
4142 jio_fprintf(defaultStream::error_stream(),
4143 "Native Memory Tracking is not supported in this VM\n");
4144 return JNI_ERR;
4145 #endif
4146 }
4147
4148 #ifndef PRODUCT
4149 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4150 CommandLineFlags::printFlags(tty, true);
4151 vm_exit(0);
4152 }
4153 #endif
4154 }
4155 return JNI_OK;
4156 }
4157
4158 static void print_options(const JavaVMInitArgs *args) {
4159 const char* tail;
4160 for (int index = 0; index < args->nOptions; index++) {
4161 const JavaVMOption *option = args->options + index;
4162 if (match_option(option, "-XX:", &tail)) {
4163 logOption(tail);
4164 }
4165 }
4166 }
4167
4168 bool Arguments::handle_deprecated_print_gc_flags() {
4169 if (PrintGC) {
4170 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4171 }
4172 if (PrintGCDetails) {
4173 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4174 }
4175
4176 if (_gc_log_filename != NULL) {
4177 // -Xloggc was used to specify a filename
4178 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4179
4180 LogTarget(Error, logging) target;
4181 LogStreamCHeap errstream(target);
4182 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4183 } else if (PrintGC || PrintGCDetails) {
4184 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4185 }
4186 return true;
4187 }
4188
4189 void Arguments::handle_extra_cms_flags(const char* msg) {
4190 SpecialFlag flag;
4191 const char *flag_name = "UseConcMarkSweepGC";
4192 if (lookup_special_flag(flag_name, flag)) {
4193 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4194 warning("%s", msg);
4195 }
4196 }
4197
4198 // Parse entry point called from JNI_CreateJavaVM
4199
4200 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4201 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4202
4203 // Initialize ranges, constraints and writeables
4204 CommandLineFlagRangeList::init();
4205 CommandLineFlagConstraintList::init();
4206 CommandLineFlagWriteableList::init();
4207
4208 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4209 const char* hotspotrc = ".hotspotrc";
4210 bool settings_file_specified = false;
4211 bool needs_hotspotrc_warning = false;
4212 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4213 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4214
4215 // Pointers to current working set of containers
4216 JavaVMInitArgs* cur_cmd_args;
4217 JavaVMInitArgs* cur_java_options_args;
4218 JavaVMInitArgs* cur_java_tool_options_args;
4219
4220 // Containers for modified/expanded options
4221 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4222 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4223 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4224
4225
4226 jint code =
4227 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4228 if (code != JNI_OK) {
4229 return code;
4230 }
4231
4232 code = parse_java_options_environment_variable(&initial_java_options_args);
4233 if (code != JNI_OK) {
4234 return code;
4235 }
4236
4237 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4238 &mod_java_tool_options_args,
4239 &cur_java_tool_options_args);
4240 if (code != JNI_OK) {
4241 return code;
4242 }
4243
4244 code = expand_vm_options_as_needed(initial_cmd_args,
4245 &mod_cmd_args,
4246 &cur_cmd_args);
4247 if (code != JNI_OK) {
4248 return code;
4249 }
4250
4251 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4252 &mod_java_options_args,
4253 &cur_java_options_args);
4254 if (code != JNI_OK) {
4255 return code;
4256 }
4257
4258 const char* flags_file = Arguments::get_jvm_flags_file();
4259 settings_file_specified = (flags_file != NULL);
4260
4261 if (IgnoreUnrecognizedVMOptions) {
4262 cur_cmd_args->ignoreUnrecognized = true;
4263 cur_java_tool_options_args->ignoreUnrecognized = true;
4264 cur_java_options_args->ignoreUnrecognized = true;
4265 }
4266
4267 // Parse specified settings file
4268 if (settings_file_specified) {
4269 if (!process_settings_file(flags_file, true,
4270 cur_cmd_args->ignoreUnrecognized)) {
4271 return JNI_EINVAL;
4272 }
4273 } else {
4274 #ifdef ASSERT
4275 // Parse default .hotspotrc settings file
4276 if (!process_settings_file(".hotspotrc", false,
4277 cur_cmd_args->ignoreUnrecognized)) {
4278 return JNI_EINVAL;
4279 }
4280 #else
4281 struct stat buf;
4282 if (os::stat(hotspotrc, &buf) == 0) {
4283 needs_hotspotrc_warning = true;
4284 }
4285 #endif
4286 }
4287
4288 if (PrintVMOptions) {
4289 print_options(cur_java_tool_options_args);
4290 print_options(cur_cmd_args);
4291 print_options(cur_java_options_args);
4292 }
4293
4294 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4295 jint result = parse_vm_init_args(cur_java_tool_options_args,
4296 cur_java_options_args,
4297 cur_cmd_args);
4298
4299 if (result != JNI_OK) {
4300 return result;
4301 }
4302
4303 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4304 SharedArchivePath = get_shared_archive_path();
4305 if (SharedArchivePath == NULL) {
4306 return JNI_ENOMEM;
4307 }
4308
4309 // Set up VerifySharedSpaces
4310 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4311 VerifySharedSpaces = true;
4312 }
4313
4314 // Delay warning until here so that we've had a chance to process
4315 // the -XX:-PrintWarnings flag
4316 if (needs_hotspotrc_warning) {
4317 warning("%s file is present but has been ignored. "
4318 "Run with -XX:Flags=%s to load the file.",
4319 hotspotrc, hotspotrc);
4320 }
4321
4322 if (needs_module_property_warning) {
4323 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4324 " names that are reserved for internal use.");
4325 }
4326
4327 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4328 UNSUPPORTED_OPTION(UseLargePages);
4329 #endif
4330
4331 ArgumentsExt::report_unsupported_options();
4332
4333 #ifndef PRODUCT
4334 if (TraceBytecodesAt != 0) {
4335 TraceBytecodes = true;
4336 }
4337 if (CountCompiledCalls) {
4338 if (UseCounterDecay) {
4339 warning("UseCounterDecay disabled because CountCalls is set");
4340 UseCounterDecay = false;
4341 }
4342 }
4343 #endif // PRODUCT
4344
4345 if (ScavengeRootsInCode == 0) {
4346 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4347 warning("Forcing ScavengeRootsInCode non-zero");
4348 }
4349 ScavengeRootsInCode = 1;
4350 }
4351
4352 if (!handle_deprecated_print_gc_flags()) {
4353 return JNI_EINVAL;
4354 }
4355
4356 // Set object alignment values.
4357 set_object_alignment();
4358
4359 #if !INCLUDE_CDS
4360 if (DumpSharedSpaces || RequireSharedSpaces) {
4361 jio_fprintf(defaultStream::error_stream(),
4362 "Shared spaces are not supported in this VM\n");
4363 return JNI_ERR;
4364 }
4365 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4366 warning("Shared spaces are not supported in this VM");
4367 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4368 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4369 }
4370 no_shared_spaces("CDS Disabled");
4371 #endif // INCLUDE_CDS
4372
4373 return JNI_OK;
4374 }
4375
4376 jint Arguments::apply_ergo() {
4377
4378 // Set flags based on ergonomics.
4379 set_ergonomics_flags();
4380
4381 set_shared_spaces_flags();
4382
4383 // Check the GC selections again.
4384 if (!check_gc_consistency()) {
4385 return JNI_EINVAL;
4386 }
4387
4388 if (TieredCompilation) {
4389 set_tiered_flags();
4390 } else {
4391 int max_compilation_policy_choice = 1;
4392 #ifdef COMPILER2
4393 max_compilation_policy_choice = 2;
4394 #endif
4395 // Check if the policy is valid.
4396 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4397 vm_exit_during_initialization(
4398 "Incompatible compilation policy selected", NULL);
4399 }
4400 // Scale CompileThreshold
4401 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4402 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4403 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4404 }
4405 }
4406
4407 #ifdef COMPILER2
4408 #ifndef PRODUCT
4409 if (PrintIdealGraphLevel > 0) {
4410 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4411 }
4412 #endif
4413 #endif
4414
4415 // Set heap size based on available physical memory
4416 set_heap_size();
4417
4418 ArgumentsExt::set_gc_specific_flags();
4419
4420 // Initialize Metaspace flags and alignments
4421 Metaspace::ergo_initialize();
4422
4423 // Set bytecode rewriting flags
4424 set_bytecode_flags();
4425
4426 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4427 jint code = set_aggressive_opts_flags();
4428 if (code != JNI_OK) {
4429 return code;
4430 }
4431
4432 // Turn off biased locking for locking debug mode flags,
4433 // which are subtly different from each other but neither works with
4434 // biased locking
4435 if (UseHeavyMonitors
4436 #ifdef COMPILER1
4437 || !UseFastLocking
4438 #endif // COMPILER1
4439 #if INCLUDE_JVMCI
4440 || !JVMCIUseFastLocking
4441 #endif
4442 ) {
4443 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4444 // flag set to true on command line; warn the user that they
4445 // can't enable biased locking here
4446 warning("Biased Locking is not supported with locking debug flags"
4447 "; ignoring UseBiasedLocking flag." );
4448 }
4449 UseBiasedLocking = false;
4450 }
4451
4452 #ifdef CC_INTERP
4453 // Clear flags not supported on zero.
4454 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4455 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4456 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4457 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4458 #endif // CC_INTERP
4459
4460 #ifdef COMPILER2
4461 if (!EliminateLocks) {
4462 EliminateNestedLocks = false;
4463 }
4464 if (!Inline) {
4465 IncrementalInline = false;
4466 }
4467 #ifndef PRODUCT
4468 if (!IncrementalInline) {
4469 AlwaysIncrementalInline = false;
4470 }
4471 #endif
4472 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4473 // nothing to use the profiling, turn if off
4474 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4475 }
4476 #endif
4477
4478 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4479 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4480 DebugNonSafepoints = true;
4481 }
4482
4483 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4484 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4485 }
4486
4487 if (UseOnStackReplacement && !UseLoopCounter) {
4488 warning("On-stack-replacement requires loop counters; enabling loop counters");
4489 FLAG_SET_DEFAULT(UseLoopCounter, true);
4490 }
4491
4492 #ifndef PRODUCT
4493 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4494 if (use_vm_log()) {
4495 LogVMOutput = true;
4496 }
4497 }
4498 #endif // PRODUCT
4499
4500 if (PrintCommandLineFlags) {
4501 CommandLineFlags::printSetFlags(tty);
4502 }
4503
4504 // Apply CPU specific policy for the BiasedLocking
4505 if (UseBiasedLocking) {
4506 if (!VM_Version::use_biased_locking() &&
4507 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4508 UseBiasedLocking = false;
4509 }
4510 }
4511 #ifdef COMPILER2
4512 if (!UseBiasedLocking || EmitSync != 0) {
4513 UseOptoBiasInlining = false;
4514 }
4515 #endif
4516
4517 return JNI_OK;
4518 }
4519
4520 jint Arguments::adjust_after_os() {
4521 if (UseNUMA) {
4522 if (UseParallelGC || UseParallelOldGC) {
4523 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4524 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4525 }
4526 }
4527 // UseNUMAInterleaving is set to ON for all collectors and
4528 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4529 // such as the parallel collector for Linux and Solaris will
4530 // interleave old gen and survivor spaces on top of NUMA
4531 // allocation policy for the eden space.
4532 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4533 // all platforms and ParallelGC on Windows will interleave all
4534 // of the heap spaces across NUMA nodes.
4535 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4536 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4537 }
4538 }
4539 return JNI_OK;
4540 }
4541
4542 int Arguments::PropertyList_count(SystemProperty* pl) {
4543 int count = 0;
4544 while(pl != NULL) {
4545 count++;
4546 pl = pl->next();
4547 }
4548 return count;
4549 }
4550
4551 // Return the number of readable properties.
4552 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4553 int count = 0;
4554 while(pl != NULL) {
4555 if (pl->is_readable()) {
4556 count++;
4557 }
4558 pl = pl->next();
4559 }
4560 return count;
4561 }
4562
4563 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4564 assert(key != NULL, "just checking");
4565 SystemProperty* prop;
4566 for (prop = pl; prop != NULL; prop = prop->next()) {
4567 if (strcmp(key, prop->key()) == 0) return prop->value();
4568 }
4569 return NULL;
4570 }
4571
4572 // Return the value of the requested property provided that it is a readable property.
4573 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4574 assert(key != NULL, "just checking");
4575 SystemProperty* prop;
4576 // Return the property value if the keys match and the property is not internal or
4577 // it's the special internal property "jdk.boot.class.path.append".
4578 for (prop = pl; prop != NULL; prop = prop->next()) {
4579 if (strcmp(key, prop->key()) == 0) {
4580 if (!prop->internal()) {
4581 return prop->value();
4582 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4583 return prop->value();
4584 } else {
4585 // Property is internal and not jdk.boot.class.path.append so return NULL.
4586 return NULL;
4587 }
4588 }
4589 }
4590 return NULL;
4591 }
4592
4593 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4594 int count = 0;
4595 const char* ret_val = NULL;
4596
4597 while(pl != NULL) {
4598 if(count >= index) {
4599 ret_val = pl->key();
4600 break;
4601 }
4602 count++;
4603 pl = pl->next();
4604 }
4605
4606 return ret_val;
4607 }
4608
4609 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4610 int count = 0;
4611 char* ret_val = NULL;
4612
4613 while(pl != NULL) {
4614 if(count >= index) {
4615 ret_val = pl->value();
4616 break;
4617 }
4618 count++;
4619 pl = pl->next();
4620 }
4621
4622 return ret_val;
4623 }
4624
4625 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4626 SystemProperty* p = *plist;
4627 if (p == NULL) {
4628 *plist = new_p;
4629 } else {
4630 while (p->next() != NULL) {
4631 p = p->next();
4632 }
4633 p->set_next(new_p);
4634 }
4635 }
4636
4637 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4638 bool writeable, bool internal) {
4639 if (plist == NULL)
4640 return;
4641
4642 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4643 PropertyList_add(plist, new_p);
4644 }
4645
4646 void Arguments::PropertyList_add(SystemProperty *element) {
4647 PropertyList_add(&_system_properties, element);
4648 }
4649
4650 // This add maintains unique property key in the list.
4651 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4652 PropertyAppendable append, PropertyWriteable writeable,
4653 PropertyInternal internal) {
4654 if (plist == NULL)
4655 return;
4656
4657 // If property key exist then update with new value.
4658 SystemProperty* prop;
4659 for (prop = *plist; prop != NULL; prop = prop->next()) {
4660 if (strcmp(k, prop->key()) == 0) {
4661 if (append == AppendProperty) {
4662 prop->append_value(v);
4663 } else {
4664 prop->set_value(v);
4665 }
4666 return;
4667 }
4668 }
4669
4670 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4671 }
4672
4673 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4674 // Returns true if all of the source pointed by src has been copied over to
4675 // the destination buffer pointed by buf. Otherwise, returns false.
4676 // Notes:
4677 // 1. If the length (buflen) of the destination buffer excluding the
4678 // NULL terminator character is not long enough for holding the expanded
4679 // pid characters, it also returns false instead of returning the partially
4680 // expanded one.
4681 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4682 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4683 char* buf, size_t buflen) {
4684 const char* p = src;
4685 char* b = buf;
4686 const char* src_end = &src[srclen];
4687 char* buf_end = &buf[buflen - 1];
4688
4689 while (p < src_end && b < buf_end) {
4690 if (*p == '%') {
4691 switch (*(++p)) {
4692 case '%': // "%%" ==> "%"
4693 *b++ = *p++;
4694 break;
4695 case 'p': { // "%p" ==> current process id
4696 // buf_end points to the character before the last character so
4697 // that we could write '\0' to the end of the buffer.
4698 size_t buf_sz = buf_end - b + 1;
4699 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4700
4701 // if jio_snprintf fails or the buffer is not long enough to hold
4702 // the expanded pid, returns false.
4703 if (ret < 0 || ret >= (int)buf_sz) {
4704 return false;
4705 } else {
4706 b += ret;
4707 assert(*b == '\0', "fail in copy_expand_pid");
4708 if (p == src_end && b == buf_end + 1) {
4709 // reach the end of the buffer.
4710 return true;
4711 }
4712 }
4713 p++;
4714 break;
4715 }
4716 default :
4717 *b++ = '%';
4718 }
4719 } else {
4720 *b++ = *p++;
4721 }
4722 }
4723 *b = '\0';
4724 return (p == src_end); // return false if not all of the source was copied
4725 }