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/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "code/codeCacheExtensions.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JVMCI
60 #include "jvmci/jvmciRuntime.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc/cms/compactibleFreeListSpace.hpp"
64 #include "gc/g1/g1CollectedHeap.inline.hpp"
65 #include "gc/parallel/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
67
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
71
72 char* Arguments::_jvm_flags_file = NULL;
73 char** Arguments::_jvm_flags_array = NULL;
74 int Arguments::_num_jvm_flags = 0;
75 char** Arguments::_jvm_args_array = NULL;
76 int Arguments::_num_jvm_args = 0;
77 char* Arguments::_java_command = NULL;
78 SystemProperty* Arguments::_system_properties = NULL;
79 const char* Arguments::_gc_log_filename = NULL;
80 bool Arguments::_has_profile = false;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
122 // part of the option string.
123 static bool match_option(const JavaVMOption *option, const char* name,
124 const char** tail) {
125 size_t len = strlen(name);
126 if (strncmp(option->optionString, name, len) == 0) {
127 *tail = option->optionString + len;
128 return true;
129 } else {
130 return false;
131 }
132 }
133
134 // Check if 'option' matches 'name'. No "tail" is allowed.
135 static bool match_option(const JavaVMOption *option, const char* name) {
136 const char* tail = NULL;
137 bool result = match_option(option, name, &tail);
138 if (tail != NULL && *tail == '\0') {
139 return result;
140 } else {
141 return false;
142 }
143 }
144
145 // Return true if any of the strings in null-terminated array 'names' matches.
146 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
147 // the option must match exactly.
148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
149 bool tail_allowed) {
150 for (/* empty */; *names != NULL; ++names) {
151 if (match_option(option, *names, tail)) {
152 if (**tail == '\0' || tail_allowed && **tail == ':') {
153 return true;
154 }
155 }
156 }
157 return false;
158 }
159
160 static void logOption(const char* opt) {
161 if (PrintVMOptions) {
162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
163 }
164 }
165
166 bool needs_module_property_warning = false;
167
168 #define MODULE_PROPERTY_PREFIX "jdk.module."
169 #define MODULE_PROPERTY_PREFIX_LEN 11
170 #define ADDEXPORTS "addexports"
171 #define ADDEXPORTS_LEN 10
172 #define ADDREADS "addreads"
173 #define ADDREADS_LEN 8
174 #define PATCH "patch"
175 #define PATCH_LEN 5
176 #define ADDMODS "addmods"
177 #define ADDMODS_LEN 7
178 #define LIMITMODS "limitmods"
179 #define LIMITMODS_LEN 9
180 #define PATH "path"
181 #define PATH_LEN 4
182 #define UPGRADE_PATH "upgrade.path"
183 #define UPGRADE_PATH_LEN 12
184
185 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
186 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
187 return ((strncmp(option, property, len) == 0) &&
188 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
189 }
190
191 // Return true if property starts with "jdk.module." and its ensuing chars match
192 // any of the reserved module properties.
193 // property should be passed without the leading "-D".
194 bool Arguments::is_internal_module_property(const char* property) {
195 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
196 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
197 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
198 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
199 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
200 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
201 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
202 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
203 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
204 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
205 return true;
206 }
207 }
208 return false;
209 }
210
211 // Process java launcher properties.
212 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
213 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
214 // sun.java.launcher.pid is defined.
215 // Must do this before setting up other system properties,
216 // as some of them may depend on launcher type.
217 for (int index = 0; index < args->nOptions; index++) {
218 const JavaVMOption* option = args->options + index;
219 const char* tail;
220
221 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
222 process_java_launcher_argument(tail, option->extraInfo);
223 continue;
224 }
225 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
226 if (strcmp(tail, "true") == 0) {
227 _sun_java_launcher_is_altjvm = true;
228 }
229 continue;
230 }
231 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
232 _sun_java_launcher_pid = atoi(tail);
233 continue;
234 }
235 }
236 }
237
238 // Initialize system properties key and value.
239 void Arguments::init_system_properties() {
240
241 // Set up _system_boot_class_path which is not a property but
242 // relies heavily on argument processing and the jdk.boot.class.path.append
243 // property. It is used to store the underlying system boot class path.
244 _system_boot_class_path = new PathString(NULL);
245
246 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
247 "Java Virtual Machine Specification", false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
251 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
252
253 // Following are JVMTI agent writable properties.
254 // Properties values are set to NULL and they are
255 // os specific they are initialized in os::init_system_properties_values().
256 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
257 _java_library_path = new SystemProperty("java.library.path", NULL, true);
258 _java_home = new SystemProperty("java.home", NULL, true);
259 _java_class_path = new SystemProperty("java.class.path", "", true);
260 // jdk.boot.class.path.append is a non-writeable, internal property.
261 // It can only be set by either:
262 // - -Xbootclasspath/a:
263 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
264 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
265
266 // Add to System Property list.
267 PropertyList_add(&_system_properties, _sun_boot_library_path);
268 PropertyList_add(&_system_properties, _java_library_path);
269 PropertyList_add(&_system_properties, _java_home);
270 PropertyList_add(&_system_properties, _java_class_path);
271 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
272
273 // Set OS specific system properties values
274 os::init_system_properties_values();
275 }
276
277 // Update/Initialize System properties after JDK version number is known
278 void Arguments::init_version_specific_system_properties() {
279 enum { bufsz = 16 };
280 char buffer[bufsz];
281 const char* spec_vendor = "Oracle Corporation";
282 uint32_t spec_version = JDK_Version::current().major_version();
283
284 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
285
286 PropertyList_add(&_system_properties,
287 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.specification.version", buffer, false));
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
292 }
293
294 /*
295 * -XX argument processing:
296 *
297 * -XX arguments are defined in several places, such as:
298 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
299 * -XX arguments are parsed in parse_argument().
300 * -XX argument bounds checking is done in check_vm_args_consistency().
301 *
302 * Over time -XX arguments may change. There are mechanisms to handle common cases:
303 *
304 * ALIASED: An option that is simply another name for another option. This is often
305 * part of the process of deprecating a flag, but not all aliases need
306 * to be deprecated.
307 *
308 * Create an alias for an option by adding the old and new option names to the
309 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
310 *
311 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
312 * support may be removed in the future. Both regular and aliased options may be
313 * deprecated.
314 *
315 * Add a deprecation warning for an option (or alias) by adding an entry in the
316 * "special_jvm_flags" table and setting the "deprecated_in" field.
317 * Often an option "deprecated" in one major release will
318 * be made "obsolete" in the next. In this case the entry should also have it's
319 * "obsolete_in" field set.
320 *
321 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
322 * on the command line. A warning is printed to let the user know that option might not
323 * be accepted in the future.
324 *
325 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
326 * table and setting the "obsolete_in" field.
327 *
328 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
329 * to the current JDK version. The system will flatly refuse to admit the existence of
330 * the flag. This allows a flag to die automatically over JDK releases.
331 *
332 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
333 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
334 * - Newly obsolete or expired deprecated options should have their global variable
335 * definitions removed (from globals.hpp, etc) and related implementations removed.
336 *
337 * Recommended approach for removing options:
338 *
339 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
340 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
341 *
342 * To remove internal options (e.g. diagnostic, experimental, develop options), use
343 * a 2-step model adding major release numbers to the obsolete and expire columns.
344 *
345 * To change the name of an option, use the alias table as well as a 2-step
346 * model adding major release numbers to the deprecate and expire columns.
347 * Think twice about aliasing commonly used customer options.
348 *
349 * There are times when it is appropriate to leave a future release number as undefined.
350 *
351 * Tests: Aliases should be tested in VMAliasOptions.java.
352 * Deprecated options should be tested in VMDeprecatedOptions.java.
353 */
354
355 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
356 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
357 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
358 // the command-line as usual, but will issue a warning.
359 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
360 // the command-line, while issuing a warning and ignoring the flag value.
361 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
362 // existence of the flag.
363 //
364 // MANUAL CLEANUP ON JDK VERSION UPDATES:
365 // This table ensures that the handling of options will update automatically when the JDK
366 // version is incremented, but the source code needs to be cleanup up manually:
367 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
368 // variable should be removed, as well as users of the variable.
369 // - As "deprecated" options age into "obsolete" options, move the entry into the
370 // "Obsolete Flags" section of the table.
371 // - All expired options should be removed from the table.
372 static SpecialFlag const special_jvm_flags[] = {
373 // -------------- Deprecated Flags --------------
374 // --- Non-alias flags - sorted by obsolete_in then expired_in:
375 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
376 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
377 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
378 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
379 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
380 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
381 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
382
383 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
384 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
385 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
387 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
388 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
389 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391
392 // -------------- Obsolete Flags - sorted by expired_in --------------
393 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
394 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
395 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 #ifndef ZERO
407 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 #endif // ZERO
410 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
422 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
423
424 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
425 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
426 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
427 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
428 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
429 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
430 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
431 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
432 #endif
433
434 { NULL, JDK_Version(0), JDK_Version(0) }
435 };
436
437 // Flags that are aliases for other flags.
438 typedef struct {
439 const char* alias_name;
440 const char* real_name;
441 } AliasedFlag;
442
443 static AliasedFlag const aliased_jvm_flags[] = {
444 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
445 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
446 { "CMSMarkStackSize", "MarkStackSize" },
447 { "G1MarkStackSize", "MarkStackSize" },
448 { "ParallelMarkingThreads", "ConcGCThreads" },
449 { "ParallelCMSThreads", "ConcGCThreads" },
450 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
451 { NULL, NULL}
452 };
453
454 // NOTE: A compatibility request will be necessary for each alias to be removed.
455 static AliasedLoggingFlag const aliased_logging_flags[] = {
456 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
457 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
458 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
459 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
460 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
461 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
462 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
463 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
464 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
465 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
466 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
467 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
468 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
469 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
470 };
471
472 #ifndef PRODUCT
473 // These options are removed in jdk9. Remove this code for jdk10.
474 static AliasedFlag const removed_develop_logging_flags[] = {
475 { "TraceClassInitialization", "-Xlog:class+init" },
476 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
477 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
478 { "TraceItables", "-Xlog:itables=debug" },
479 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
480 { "TraceSafepoint", "-Xlog:safepoint=debug" },
481 { "TraceStartupTime", "-Xlog:startuptime" },
482 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
483 { "PrintVtables", "-Xlog:vtables=debug" },
484 { "VerboseVerification", "-Xlog:verification" },
485 { NULL, NULL }
486 };
487 #endif //PRODUCT
488
489 // Return true if "v" is less than "other", where "other" may be "undefined".
490 static bool version_less_than(JDK_Version v, JDK_Version other) {
491 assert(!v.is_undefined(), "must be defined");
492 if (!other.is_undefined() && v.compare(other) >= 0) {
493 return false;
494 } else {
495 return true;
496 }
497 }
498
499 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
500
501 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
502 // Allow extensions to have priority
503 if (lookup_special_flag_ext(flag_name, flag)) {
504 return true;
505 }
506
507 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
508 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
509 flag = special_jvm_flags[i];
510 return true;
511 }
512 }
513 return false;
514 }
515
516 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
517 assert(version != NULL, "Must provide a version buffer");
518 SpecialFlag flag;
519 if (lookup_special_flag(flag_name, flag)) {
520 if (!flag.obsolete_in.is_undefined()) {
521 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
522 *version = flag.obsolete_in;
523 return true;
524 }
525 }
526 }
527 return false;
528 }
529
530 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
531 assert(version != NULL, "Must provide a version buffer");
532 SpecialFlag flag;
533 if (lookup_special_flag(flag_name, flag)) {
534 if (!flag.deprecated_in.is_undefined()) {
535 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
536 version_less_than(JDK_Version::current(), flag.expired_in)) {
537 *version = flag.deprecated_in;
538 return 1;
539 } else {
540 return -1;
541 }
542 }
543 }
544 return 0;
545 }
546
547 #ifndef PRODUCT
548 const char* Arguments::removed_develop_logging_flag_name(const char* name){
549 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
550 const AliasedFlag& flag = removed_develop_logging_flags[i];
551 if (strcmp(flag.alias_name, name) == 0) {
552 return flag.real_name;
553 }
554 }
555 return NULL;
556 }
557 #endif // PRODUCT
558
559 const char* Arguments::real_flag_name(const char *flag_name) {
560 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
561 const AliasedFlag& flag_status = aliased_jvm_flags[i];
562 if (strcmp(flag_status.alias_name, flag_name) == 0) {
563 return flag_status.real_name;
564 }
565 }
566 return flag_name;
567 }
568
569 #ifdef ASSERT
570 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
571 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
572 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
573 return true;
574 }
575 }
576 return false;
577 }
578
579 static bool verify_special_jvm_flags() {
580 bool success = true;
581 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
582 const SpecialFlag& flag = special_jvm_flags[i];
583 if (lookup_special_flag(flag.name, i)) {
584 warning("Duplicate special flag declaration \"%s\"", flag.name);
585 success = false;
586 }
587 if (flag.deprecated_in.is_undefined() &&
588 flag.obsolete_in.is_undefined()) {
589 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
590 success = false;
591 }
592
593 if (!flag.deprecated_in.is_undefined()) {
594 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
595 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
596 success = false;
597 }
598
599 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
600 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
601 success = false;
602 }
603 }
604
605 if (!flag.obsolete_in.is_undefined()) {
606 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
607 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
608 success = false;
609 }
610
611 // if flag has become obsolete it should not have a "globals" flag defined anymore.
612 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
613 if (Flag::find_flag(flag.name) != NULL) {
614 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
615 success = false;
616 }
617 }
618 }
619
620 if (!flag.expired_in.is_undefined()) {
621 // if flag has become expired it should not have a "globals" flag defined anymore.
622 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
623 if (Flag::find_flag(flag.name) != NULL) {
624 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
625 success = false;
626 }
627 }
628 }
629
630 }
631 return success;
632 }
633 #endif
634
635 // Parses a size specification string.
636 bool Arguments::atojulong(const char *s, julong* result) {
637 julong n = 0;
638
639 // First char must be a digit. Don't allow negative numbers or leading spaces.
640 if (!isdigit(*s)) {
641 return false;
642 }
643
644 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
645 char* remainder;
646 errno = 0;
647 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
648 if (errno != 0) {
649 return false;
650 }
651
652 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
653 if (remainder == s || strlen(remainder) > 1) {
654 return false;
655 }
656
657 switch (*remainder) {
658 case 'T': case 't':
659 *result = n * G * K;
660 // Check for overflow.
661 if (*result/((julong)G * K) != n) return false;
662 return true;
663 case 'G': case 'g':
664 *result = n * G;
665 if (*result/G != n) return false;
666 return true;
667 case 'M': case 'm':
668 *result = n * M;
669 if (*result/M != n) return false;
670 return true;
671 case 'K': case 'k':
672 *result = n * K;
673 if (*result/K != n) return false;
674 return true;
675 case '\0':
676 *result = n;
677 return true;
678 default:
679 return false;
680 }
681 }
682
683 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
684 if (size < min_size) return arg_too_small;
685 // Check that size will fit in a size_t (only relevant on 32-bit)
686 if (size > max_uintx) return arg_too_big;
687 return arg_in_range;
688 }
689
690 // Describe an argument out of range error
691 void Arguments::describe_range_error(ArgsRange errcode) {
692 switch(errcode) {
693 case arg_too_big:
694 jio_fprintf(defaultStream::error_stream(),
695 "The specified size exceeds the maximum "
696 "representable size.\n");
697 break;
698 case arg_too_small:
699 case arg_unreadable:
700 case arg_in_range:
701 // do nothing for now
702 break;
703 default:
704 ShouldNotReachHere();
705 }
706 }
707
708 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
709 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
710 return true;
711 } else {
712 return false;
713 }
714 }
715
716 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
717 char* end;
718 errno = 0;
719 double v = strtod(value, &end);
720 if ((errno != 0) || (*end != 0)) {
721 return false;
722 }
723
724 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
725 return true;
726 }
727 return false;
728 }
729
730 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
731 julong v;
732 int int_v;
733 intx intx_v;
734 bool is_neg = false;
735 Flag* result = Flag::find_flag(name, strlen(name));
736
737 if (result == NULL) {
738 return false;
739 }
740
741 // Check the sign first since atojulong() parses only unsigned values.
742 if (*value == '-') {
743 if (!result->is_intx() && !result->is_int()) {
744 return false;
745 }
746 value++;
747 is_neg = true;
748 }
749 if (!Arguments::atojulong(value, &v)) {
750 return false;
751 }
752 if (result->is_int()) {
753 int_v = (int) v;
754 if (is_neg) {
755 int_v = -int_v;
756 }
757 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
758 } else if (result->is_uint()) {
759 uint uint_v = (uint) v;
760 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
761 } else if (result->is_intx()) {
762 intx_v = (intx) v;
763 if (is_neg) {
764 intx_v = -intx_v;
765 }
766 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
767 } else if (result->is_uintx()) {
768 uintx uintx_v = (uintx) v;
769 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
770 } else if (result->is_uint64_t()) {
771 uint64_t uint64_t_v = (uint64_t) v;
772 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
773 } else if (result->is_size_t()) {
774 size_t size_t_v = (size_t) v;
775 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
776 } else {
777 return false;
778 }
779 }
780
781 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
782 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
783 // Contract: CommandLineFlags always returns a pointer that needs freeing.
784 FREE_C_HEAP_ARRAY(char, value);
785 return true;
786 }
787
788 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
789 const char* old_value = "";
790 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
791 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
792 size_t new_len = strlen(new_value);
793 const char* value;
794 char* free_this_too = NULL;
795 if (old_len == 0) {
796 value = new_value;
797 } else if (new_len == 0) {
798 value = old_value;
799 } else {
800 size_t length = old_len + 1 + new_len + 1;
801 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
802 // each new setting adds another LINE to the switch:
803 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
804 value = buf;
805 free_this_too = buf;
806 }
807 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
808 // CommandLineFlags always returns a pointer that needs freeing.
809 FREE_C_HEAP_ARRAY(char, value);
810 if (free_this_too != NULL) {
811 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
812 FREE_C_HEAP_ARRAY(char, free_this_too);
813 }
814 return true;
815 }
816
817 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
818 const char* real_name = real_flag_name(arg);
819 JDK_Version since = JDK_Version();
820 switch (is_deprecated_flag(arg, &since)) {
821 case -1:
822 return NULL; // obsolete or expired, don't process normally
823 case 0:
824 return real_name;
825 case 1: {
826 if (warn) {
827 char version[256];
828 since.to_string(version, sizeof(version));
829 if (real_name != arg) {
830 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
831 arg, version, real_name);
832 } else {
833 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
834 arg, version);
835 }
836 }
837 return real_name;
838 }
839 }
840 ShouldNotReachHere();
841 return NULL;
842 }
843
844 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
845 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
846 // Set tagset string buffer at max size of 256, large enough for any alias tagset
847 const int max_tagset_size = 256;
848 int max_tagset_len = max_tagset_size - 1;
849 char tagset_buffer[max_tagset_size];
850 tagset_buffer[0] = '\0';
851
852 // Write tag-set for aliased logging option, in string list form
853 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
854 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
855 if (i > 0) {
856 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
857 }
858 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
859 }
860 if (!alf.exactMatch) {
861 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
862 }
863 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
864 (on) ? "+" : "-",
865 name,
866 tagset_buffer,
867 (on) ? LogLevel::name(alf.level) : "off");
868 }
869
870 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
871 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
872 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
873 if (strcmp(alf.alias_name, name) == 0) {
874 log_deprecated_flag(name, on, alf);
875 return alf;
876 }
877 }
878 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
879 return a;
880 }
881
882 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
883
884 // range of acceptable characters spelled out for portability reasons
885 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
886 #define BUFLEN 255
887 char name[BUFLEN+1];
888 char dummy;
889 const char* real_name;
890 bool warn_if_deprecated = true;
891
892 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
893 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
894 if (alf.alias_name != NULL){
895 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
896 return true;
897 }
898 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
899 if (real_name == NULL) {
900 return false;
901 }
902 return set_bool_flag(real_name, false, origin);
903 }
904 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
905 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
906 if (alf.alias_name != NULL){
907 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
908 return true;
909 }
910 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
911 if (real_name == NULL) {
912 return false;
913 }
914 return set_bool_flag(real_name, true, origin);
915 }
916
917 char punct;
918 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
919 const char* value = strchr(arg, '=') + 1;
920 Flag* flag;
921
922 // this scanf pattern matches both strings (handled here) and numbers (handled later))
923 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
924 if (alf.alias_name != NULL) {
925 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
926 return true;
927 }
928 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
929 if (real_name == NULL) {
930 return false;
931 }
932 flag = Flag::find_flag(real_name);
933 if (flag != NULL && flag->is_ccstr()) {
934 if (flag->ccstr_accumulates()) {
935 return append_to_string_flag(real_name, value, origin);
936 } else {
937 if (value[0] == '\0') {
938 value = NULL;
939 }
940 return set_string_flag(real_name, value, origin);
941 }
942 } else {
943 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
944 }
945 }
946
947 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
948 const char* value = strchr(arg, '=') + 1;
949 // -XX:Foo:=xxx will reset the string flag to the given value.
950 if (value[0] == '\0') {
951 value = NULL;
952 }
953 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
954 if (real_name == NULL) {
955 return false;
956 }
957 return set_string_flag(real_name, value, origin);
958 }
959
960 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
961 #define SIGNED_NUMBER_RANGE "[-0123456789]"
962 #define NUMBER_RANGE "[0123456789eE+-]"
963 char value[BUFLEN + 1];
964 char value2[BUFLEN + 1];
965 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
966 // Looks like a floating-point number -- try again with more lenient format string
967 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
968 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
969 if (real_name == NULL) {
970 return false;
971 }
972 return set_fp_numeric_flag(real_name, value, origin);
973 }
974 }
975
976 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
977 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
978 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
979 if (real_name == NULL) {
980 return false;
981 }
982 return set_numeric_flag(real_name, value, origin);
983 }
984
985 return false;
986 }
987
988 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
989 assert(bldarray != NULL, "illegal argument");
990
991 if (arg == NULL) {
992 return;
993 }
994
995 int new_count = *count + 1;
996
997 // expand the array and add arg to the last element
998 if (*bldarray == NULL) {
999 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1000 } else {
1001 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1002 }
1003 (*bldarray)[*count] = os::strdup_check_oom(arg);
1004 *count = new_count;
1005 }
1006
1007 void Arguments::build_jvm_args(const char* arg) {
1008 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1009 }
1010
1011 void Arguments::build_jvm_flags(const char* arg) {
1012 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1013 }
1014
1015 // utility function to return a string that concatenates all
1016 // strings in a given char** array
1017 const char* Arguments::build_resource_string(char** args, int count) {
1018 if (args == NULL || count == 0) {
1019 return NULL;
1020 }
1021 size_t length = 0;
1022 for (int i = 0; i < count; i++) {
1023 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1024 }
1025 char* s = NEW_RESOURCE_ARRAY(char, length);
1026 char* dst = s;
1027 for (int j = 0; j < count; j++) {
1028 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1029 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1030 dst += offset;
1031 length -= offset;
1032 }
1033 return (const char*) s;
1034 }
1035
1036 void Arguments::print_on(outputStream* st) {
1037 st->print_cr("VM Arguments:");
1038 if (num_jvm_flags() > 0) {
1039 st->print("jvm_flags: "); print_jvm_flags_on(st);
1040 st->cr();
1041 }
1042 if (num_jvm_args() > 0) {
1043 st->print("jvm_args: "); print_jvm_args_on(st);
1044 st->cr();
1045 }
1046 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1047 if (_java_class_path != NULL) {
1048 char* path = _java_class_path->value();
1049 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1050 }
1051 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1052 }
1053
1054 void Arguments::print_summary_on(outputStream* st) {
1055 // Print the command line. Environment variables that are helpful for
1056 // reproducing the problem are written later in the hs_err file.
1057 // flags are from setting file
1058 if (num_jvm_flags() > 0) {
1059 st->print_raw("Settings File: ");
1060 print_jvm_flags_on(st);
1061 st->cr();
1062 }
1063 // args are the command line and environment variable arguments.
1064 st->print_raw("Command Line: ");
1065 if (num_jvm_args() > 0) {
1066 print_jvm_args_on(st);
1067 }
1068 // this is the classfile and any arguments to the java program
1069 if (java_command() != NULL) {
1070 st->print("%s", java_command());
1071 }
1072 st->cr();
1073 }
1074
1075 void Arguments::print_jvm_flags_on(outputStream* st) {
1076 if (_num_jvm_flags > 0) {
1077 for (int i=0; i < _num_jvm_flags; i++) {
1078 st->print("%s ", _jvm_flags_array[i]);
1079 }
1080 }
1081 }
1082
1083 void Arguments::print_jvm_args_on(outputStream* st) {
1084 if (_num_jvm_args > 0) {
1085 for (int i=0; i < _num_jvm_args; i++) {
1086 st->print("%s ", _jvm_args_array[i]);
1087 }
1088 }
1089 }
1090
1091 bool Arguments::process_argument(const char* arg,
1092 jboolean ignore_unrecognized,
1093 Flag::Flags origin) {
1094 JDK_Version since = JDK_Version();
1095
1096 if (parse_argument(arg, origin)) {
1097 return true;
1098 }
1099
1100 // Determine if the flag has '+', '-', or '=' characters.
1101 bool has_plus_minus = (*arg == '+' || *arg == '-');
1102 const char* const argname = has_plus_minus ? arg + 1 : arg;
1103
1104 size_t arg_len;
1105 const char* equal_sign = strchr(argname, '=');
1106 if (equal_sign == NULL) {
1107 arg_len = strlen(argname);
1108 } else {
1109 arg_len = equal_sign - argname;
1110 }
1111
1112 // Only make the obsolete check for valid arguments.
1113 if (arg_len <= BUFLEN) {
1114 // Construct a string which consists only of the argument name without '+', '-', or '='.
1115 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1117 if (is_obsolete_flag(stripped_argname, &since)) {
1118 char version[256];
1119 since.to_string(version, sizeof(version));
1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1121 return true;
1122 }
1123 #ifndef PRODUCT
1124 else {
1125 const char* replacement;
1126 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1127 log_warning(arguments)("%s has been removed. Please use %s instead.",
1128 stripped_argname,
1129 replacement);
1130 return false;
1131 }
1132 }
1133 #endif //PRODUCT
1134 }
1135
1136 // For locked flags, report a custom error message if available.
1137 // Otherwise, report the standard unrecognized VM option.
1138 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1139 if (found_flag != NULL) {
1140 char locked_message_buf[BUFLEN];
1141 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1142 if (strlen(locked_message_buf) == 0) {
1143 if (found_flag->is_bool() && !has_plus_minus) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Missing +/- setting for VM option '%s'\n", argname);
1146 } else if (!found_flag->is_bool() && has_plus_minus) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Unexpected +/- setting in VM option '%s'\n", argname);
1149 } else {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Improperly specified VM option '%s'\n", argname);
1152 }
1153 } else {
1154 #ifdef PRODUCT
1155 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1156 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1157 if (ignore_unrecognized && mismatched) {
1158 return true;
1159 }
1160 #endif
1161 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1162 }
1163 } else {
1164 if (ignore_unrecognized) {
1165 return true;
1166 }
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Unrecognized VM option '%s'\n", argname);
1169 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1170 if (fuzzy_matched != NULL) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "Did you mean '%s%s%s'? ",
1173 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1174 fuzzy_matched->_name,
1175 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1176 }
1177 }
1178
1179 // allow for commandline "commenting out" options like -XX:#+Verbose
1180 return arg[0] == '#';
1181 }
1182
1183 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1184 FILE* stream = fopen(file_name, "rb");
1185 if (stream == NULL) {
1186 if (should_exist) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Could not open settings file %s\n", file_name);
1189 return false;
1190 } else {
1191 return true;
1192 }
1193 }
1194
1195 char token[1024];
1196 int pos = 0;
1197
1198 bool in_white_space = true;
1199 bool in_comment = false;
1200 bool in_quote = false;
1201 char quote_c = 0;
1202 bool result = true;
1203
1204 int c = getc(stream);
1205 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1206 if (in_white_space) {
1207 if (in_comment) {
1208 if (c == '\n') in_comment = false;
1209 } else {
1210 if (c == '#') in_comment = true;
1211 else if (!isspace(c)) {
1212 in_white_space = false;
1213 token[pos++] = c;
1214 }
1215 }
1216 } else {
1217 if (c == '\n' || (!in_quote && isspace(c))) {
1218 // token ends at newline, or at unquoted whitespace
1219 // this allows a way to include spaces in string-valued options
1220 token[pos] = '\0';
1221 logOption(token);
1222 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1223 build_jvm_flags(token);
1224 pos = 0;
1225 in_white_space = true;
1226 in_quote = false;
1227 } else if (!in_quote && (c == '\'' || c == '"')) {
1228 in_quote = true;
1229 quote_c = c;
1230 } else if (in_quote && (c == quote_c)) {
1231 in_quote = false;
1232 } else {
1233 token[pos++] = c;
1234 }
1235 }
1236 c = getc(stream);
1237 }
1238 if (pos > 0) {
1239 token[pos] = '\0';
1240 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1241 build_jvm_flags(token);
1242 }
1243 fclose(stream);
1244 return result;
1245 }
1246
1247 //=============================================================================================================
1248 // Parsing of properties (-D)
1249
1250 const char* Arguments::get_property(const char* key) {
1251 return PropertyList_get_value(system_properties(), key);
1252 }
1253
1254 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1255 const char* eq = strchr(prop, '=');
1256 const char* key;
1257 const char* value = "";
1258
1259 if (eq == NULL) {
1260 // property doesn't have a value, thus use passed string
1261 key = prop;
1262 } else {
1263 // property have a value, thus extract it and save to the
1264 // allocated string
1265 size_t key_len = eq - prop;
1266 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1267
1268 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1269 key = tmp_key;
1270
1271 value = &prop[key_len + 1];
1272 }
1273
1274 if (strcmp(key, "java.compiler") == 0) {
1275 process_java_compiler_argument(value);
1276 // Record value in Arguments, but let it get passed to Java.
1277 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1278 strcmp(key, "sun.java.launcher.pid") == 0) {
1279 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1280 // private and are processed in process_sun_java_launcher_properties();
1281 // the sun.java.launcher property is passed on to the java application
1282 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1283 // append is true, writable is true, internal is false
1284 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1285 WriteableProperty, ExternalProperty);
1286 } else {
1287 if (strcmp(key, "sun.java.command") == 0) {
1288 char *old_java_command = _java_command;
1289 _java_command = os::strdup_check_oom(value, mtArguments);
1290 if (old_java_command != NULL) {
1291 os::free(old_java_command);
1292 }
1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1294 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1295 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1296 // its value without going through the property list or making a Java call.
1297 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1298 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1299 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1300 os::free((void *)old_java_vendor_url_bug);
1301 }
1302 }
1303
1304 // Create new property and add at the end of the list
1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1306 }
1307
1308 if (key != prop) {
1309 // SystemProperty copy passed value, thus free previously allocated
1310 // memory
1311 FreeHeap((void *)key);
1312 }
1313
1314 return true;
1315 }
1316
1317 #if INCLUDE_CDS
1318 void Arguments::check_unsupported_dumping_properties() {
1319 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1320 const char* unsupported_properties[] = { "jdk.module.main",
1321 "jdk.module.limitmods",
1322 "jdk.module.path",
1323 "jdk.module.upgrade.path",
1324 "jdk.module.addmods.0" };
1325 const char* unsupported_options[] = { "-m",
1326 "--limit-modules",
1327 "--module-path",
1328 "--upgrade-module-path",
1329 "--add-modules" };
1330 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1331 // If a vm option is found in the unsupported_options array with index less than the warning_idx,
1332 // vm will exit with an error message. Otherwise, it will result in a warning message.
1333 uint warning_idx = 2;
1334 SystemProperty* sp = system_properties();
1335 while (sp != NULL) {
1336 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1337 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1338 if (i < warning_idx) {
1339 vm_exit_during_initialization(
1340 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1341 } else {
1342 warning(
1343 "the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1344 }
1345 }
1346 }
1347 sp = sp->next();
1348 }
1349
1350 // Check for an exploded module build in use with -Xshare:dump.
1351 if (!has_jimage()) {
1352 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1353 }
1354 }
1355 #endif
1356
1357 //===========================================================================================================
1358 // Setting int/mixed/comp mode flags
1359
1360 void Arguments::set_mode_flags(Mode mode) {
1361 // Set up default values for all flags.
1362 // If you add a flag to any of the branches below,
1363 // add a default value for it here.
1364 set_java_compiler(false);
1365 _mode = mode;
1366
1367 // Ensure Agent_OnLoad has the correct initial values.
1368 // This may not be the final mode; mode may change later in onload phase.
1369 PropertyList_unique_add(&_system_properties, "java.vm.info",
1370 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1371
1372 UseInterpreter = true;
1373 UseCompiler = true;
1374 UseLoopCounter = true;
1375
1376 // Default values may be platform/compiler dependent -
1377 // use the saved values
1378 ClipInlining = Arguments::_ClipInlining;
1379 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1380 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1381 BackgroundCompilation = Arguments::_BackgroundCompilation;
1382 if (TieredCompilation) {
1383 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1384 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1385 }
1386 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1387 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1388 }
1389 }
1390
1391 // Change from defaults based on mode
1392 switch (mode) {
1393 default:
1394 ShouldNotReachHere();
1395 break;
1396 case _int:
1397 UseCompiler = false;
1398 UseLoopCounter = false;
1399 AlwaysCompileLoopMethods = false;
1400 UseOnStackReplacement = false;
1401 break;
1402 case _mixed:
1403 // same as default
1404 break;
1405 case _comp:
1406 UseInterpreter = false;
1407 BackgroundCompilation = false;
1408 ClipInlining = false;
1409 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1410 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1411 // compile a level 4 (C2) and then continue executing it.
1412 if (TieredCompilation) {
1413 Tier3InvokeNotifyFreqLog = 0;
1414 Tier4InvocationThreshold = 0;
1415 }
1416 break;
1417 }
1418 }
1419
1420 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1421 // Conflict: required to use shared spaces (-Xshare:on), but
1422 // incompatible command line options were chosen.
1423
1424 static void no_shared_spaces(const char* message) {
1425 if (RequireSharedSpaces) {
1426 jio_fprintf(defaultStream::error_stream(),
1427 "Class data sharing is inconsistent with other specified options.\n");
1428 vm_exit_during_initialization("Unable to use shared archive.", message);
1429 } else {
1430 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1431 }
1432 }
1433 #endif
1434
1435 // Returns threshold scaled with the value of scale.
1436 // If scale < 0.0, threshold is returned without scaling.
1437 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1438 if (scale == 1.0 || scale < 0.0) {
1439 return threshold;
1440 } else {
1441 return (intx)(threshold * scale);
1442 }
1443 }
1444
1445 // Returns freq_log scaled with the value of scale.
1446 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1447 // If scale < 0.0, freq_log is returned without scaling.
1448 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1449 // Check if scaling is necessary or if negative value was specified.
1450 if (scale == 1.0 || scale < 0.0) {
1451 return freq_log;
1452 }
1453 // Check values to avoid calculating log2 of 0.
1454 if (scale == 0.0 || freq_log == 0) {
1455 return 0;
1456 }
1457 // Determine the maximum notification frequency value currently supported.
1458 // The largest mask value that the interpreter/C1 can handle is
1459 // of length InvocationCounter::number_of_count_bits. Mask values are always
1460 // one bit shorter then the value of the notification frequency. Set
1461 // max_freq_bits accordingly.
1462 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1463 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1464 if (scaled_freq == 0) {
1465 // Return 0 right away to avoid calculating log2 of 0.
1466 return 0;
1467 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1468 return max_freq_bits;
1469 } else {
1470 return log2_intptr(scaled_freq);
1471 }
1472 }
1473
1474 void Arguments::set_tiered_flags() {
1475 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1476 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1477 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1478 }
1479 if (CompilationPolicyChoice < 2) {
1480 vm_exit_during_initialization(
1481 "Incompatible compilation policy selected", NULL);
1482 }
1483 // Increase the code cache size - tiered compiles a lot more.
1484 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1485 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1486 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1487 }
1488 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1489 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1490 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1491 }
1492 if (!UseInterpreter) { // -Xcomp
1493 Tier3InvokeNotifyFreqLog = 0;
1494 Tier4InvocationThreshold = 0;
1495 }
1496
1497 if (CompileThresholdScaling < 0) {
1498 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1499 }
1500
1501 // Scale tiered compilation thresholds.
1502 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1503 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1504 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1505 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1506
1507 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1508 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1509 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1510 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1511
1512 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1513 // once these thresholds become supported.
1514
1515 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1516 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1517
1518 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1519 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1520
1521 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1522
1523 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1524 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1525 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1526 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1527 }
1528 }
1529
1530 #if INCLUDE_ALL_GCS
1531 static void disable_adaptive_size_policy(const char* collector_name) {
1532 if (UseAdaptiveSizePolicy) {
1533 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1534 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1535 collector_name);
1536 }
1537 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1538 }
1539 }
1540
1541 void Arguments::set_parnew_gc_flags() {
1542 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1543 "control point invariant");
1544 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1545 assert(UseParNewGC, "ParNew should always be used with CMS");
1546
1547 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1548 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1549 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1550 } else if (ParallelGCThreads == 0) {
1551 jio_fprintf(defaultStream::error_stream(),
1552 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1553 vm_exit(1);
1554 }
1555
1556 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1557 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1558 // we set them to 1024 and 1024.
1559 // See CR 6362902.
1560 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1561 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1562 }
1563 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1564 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1565 }
1566
1567 // When using compressed oops, we use local overflow stacks,
1568 // rather than using a global overflow list chained through
1569 // the klass word of the object's pre-image.
1570 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1571 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1572 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1573 }
1574 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1575 }
1576 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1577 }
1578
1579 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1580 // sparc/solaris for certain applications, but would gain from
1581 // further optimization and tuning efforts, and would almost
1582 // certainly gain from analysis of platform and environment.
1583 void Arguments::set_cms_and_parnew_gc_flags() {
1584 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1585 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1586 assert(UseParNewGC, "ParNew should always be used with CMS");
1587
1588 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1589 disable_adaptive_size_policy("UseConcMarkSweepGC");
1590
1591 set_parnew_gc_flags();
1592
1593 size_t max_heap = align_size_down(MaxHeapSize,
1594 CardTableRS::ct_max_alignment_constraint());
1595
1596 // Now make adjustments for CMS
1597 intx tenuring_default = (intx)6;
1598 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1599
1600 // Preferred young gen size for "short" pauses:
1601 // upper bound depends on # of threads and NewRatio.
1602 const size_t preferred_max_new_size_unaligned =
1603 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1604 size_t preferred_max_new_size =
1605 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1606
1607 // Unless explicitly requested otherwise, size young gen
1608 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1609
1610 // If either MaxNewSize or NewRatio is set on the command line,
1611 // assume the user is trying to set the size of the young gen.
1612 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1613
1614 // Set MaxNewSize to our calculated preferred_max_new_size unless
1615 // NewSize was set on the command line and it is larger than
1616 // preferred_max_new_size.
1617 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1618 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1619 } else {
1620 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1621 }
1622 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1623
1624 // Code along this path potentially sets NewSize and OldSize
1625 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1626 min_heap_size(), InitialHeapSize, max_heap);
1627 size_t min_new = preferred_max_new_size;
1628 if (FLAG_IS_CMDLINE(NewSize)) {
1629 min_new = NewSize;
1630 }
1631 if (max_heap > min_new && min_heap_size() > min_new) {
1632 // Unless explicitly requested otherwise, make young gen
1633 // at least min_new, and at most preferred_max_new_size.
1634 if (FLAG_IS_DEFAULT(NewSize)) {
1635 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1636 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1637 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1638 }
1639 // Unless explicitly requested otherwise, size old gen
1640 // so it's NewRatio x of NewSize.
1641 if (FLAG_IS_DEFAULT(OldSize)) {
1642 if (max_heap > NewSize) {
1643 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1644 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1645 }
1646 }
1647 }
1648 }
1649 // Unless explicitly requested otherwise, definitely
1650 // promote all objects surviving "tenuring_default" scavenges.
1651 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1652 FLAG_IS_DEFAULT(SurvivorRatio)) {
1653 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1654 }
1655 // If we decided above (or user explicitly requested)
1656 // `promote all' (via MaxTenuringThreshold := 0),
1657 // prefer minuscule survivor spaces so as not to waste
1658 // space for (non-existent) survivors
1659 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1660 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1661 }
1662
1663 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1664 // but rather the number of free blocks of a given size that are used when
1665 // replenishing the local per-worker free list caches.
1666 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1667 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1668 // OldPLAB sizing manually turned off: Use a larger default setting,
1669 // unless it was manually specified. This is because a too-low value
1670 // will slow down scavenges.
1671 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1672 } else {
1673 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1674 }
1675 }
1676
1677 // If either of the static initialization defaults have changed, note this
1678 // modification.
1679 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1680 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1681 }
1682
1683 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1684 }
1685 #endif // INCLUDE_ALL_GCS
1686
1687 void set_object_alignment() {
1688 // Object alignment.
1689 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1690 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1691 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1692 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1693 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1694 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1695
1696 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1697 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1698
1699 // Oop encoding heap max
1700 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1701
1702 if (SurvivorAlignmentInBytes == 0) {
1703 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1704 }
1705
1706 #if INCLUDE_ALL_GCS
1707 // Set CMS global values
1708 CompactibleFreeListSpace::set_cms_values();
1709 #endif // INCLUDE_ALL_GCS
1710 }
1711
1712 size_t Arguments::max_heap_for_compressed_oops() {
1713 // Avoid sign flip.
1714 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1715 // We need to fit both the NULL page and the heap into the memory budget, while
1716 // keeping alignment constraints of the heap. To guarantee the latter, as the
1717 // NULL page is located before the heap, we pad the NULL page to the conservative
1718 // maximum alignment that the GC may ever impose upon the heap.
1719 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1720 _conservative_max_heap_alignment);
1721
1722 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1723 NOT_LP64(ShouldNotReachHere(); return 0);
1724 }
1725
1726 bool Arguments::should_auto_select_low_pause_collector() {
1727 if (UseAutoGCSelectPolicy &&
1728 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1729 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1730 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1731 return true;
1732 }
1733 return false;
1734 }
1735
1736 void Arguments::set_use_compressed_oops() {
1737 #ifndef ZERO
1738 #ifdef _LP64
1739 // MaxHeapSize is not set up properly at this point, but
1740 // the only value that can override MaxHeapSize if we are
1741 // to use UseCompressedOops is InitialHeapSize.
1742 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1743
1744 if (max_heap_size <= max_heap_for_compressed_oops()) {
1745 #if !defined(COMPILER1) || defined(TIERED)
1746 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1747 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1748 }
1749 #endif
1750 } else {
1751 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1752 warning("Max heap size too large for Compressed Oops");
1753 FLAG_SET_DEFAULT(UseCompressedOops, false);
1754 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1755 }
1756 }
1757 #endif // _LP64
1758 #endif // ZERO
1759 }
1760
1761
1762 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1763 // set_use_compressed_oops().
1764 void Arguments::set_use_compressed_klass_ptrs() {
1765 #ifndef ZERO
1766 #ifdef _LP64
1767 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1768 if (!UseCompressedOops) {
1769 if (UseCompressedClassPointers) {
1770 warning("UseCompressedClassPointers requires UseCompressedOops");
1771 }
1772 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1773 } else {
1774 // Turn on UseCompressedClassPointers too
1775 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1776 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1777 }
1778 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1779 if (UseCompressedClassPointers) {
1780 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1781 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1782 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1783 }
1784 }
1785 }
1786 #endif // _LP64
1787 #endif // !ZERO
1788 }
1789
1790 void Arguments::set_conservative_max_heap_alignment() {
1791 // The conservative maximum required alignment for the heap is the maximum of
1792 // the alignments imposed by several sources: any requirements from the heap
1793 // itself, the collector policy and the maximum page size we may run the VM
1794 // with.
1795 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1796 #if INCLUDE_ALL_GCS
1797 if (UseParallelGC) {
1798 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1799 } else if (UseG1GC) {
1800 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1801 }
1802 #endif // INCLUDE_ALL_GCS
1803 _conservative_max_heap_alignment = MAX4(heap_alignment,
1804 (size_t)os::vm_allocation_granularity(),
1805 os::max_page_size(),
1806 CollectorPolicy::compute_heap_alignment());
1807 }
1808
1809 bool Arguments::gc_selected() {
1810 #if INCLUDE_ALL_GCS
1811 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1812 #else
1813 return UseSerialGC;
1814 #endif // INCLUDE_ALL_GCS
1815 }
1816
1817 void Arguments::select_gc_ergonomically() {
1818 #if INCLUDE_ALL_GCS
1819 if (os::is_server_class_machine()) {
1820 if (!UseAutoGCSelectPolicy) {
1821 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1822 } else {
1823 if (should_auto_select_low_pause_collector()) {
1824 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1825 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1826 } else {
1827 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1828 }
1829 }
1830 } else {
1831 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1832 }
1833 #else
1834 UNSUPPORTED_OPTION(UseG1GC);
1835 UNSUPPORTED_OPTION(UseParallelGC);
1836 UNSUPPORTED_OPTION(UseParallelOldGC);
1837 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1838 UNSUPPORTED_OPTION(UseParNewGC);
1839 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1840 #endif // INCLUDE_ALL_GCS
1841 }
1842
1843 void Arguments::select_gc() {
1844 if (!gc_selected()) {
1845 select_gc_ergonomically();
1846 if (!gc_selected()) {
1847 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1848 }
1849 }
1850 }
1851
1852 void Arguments::set_ergonomics_flags() {
1853 select_gc();
1854
1855 #if defined(COMPILER2) || INCLUDE_JVMCI
1856 // Shared spaces work fine with other GCs but causes bytecode rewriting
1857 // to be disabled, which hurts interpreter performance and decreases
1858 // server performance. When -server is specified, keep the default off
1859 // unless it is asked for. Future work: either add bytecode rewriting
1860 // at link time, or rewrite bytecodes in non-shared methods.
1861 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1862 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1863 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1864 }
1865 #endif
1866
1867 set_conservative_max_heap_alignment();
1868
1869 #ifndef ZERO
1870 #ifdef _LP64
1871 set_use_compressed_oops();
1872
1873 // set_use_compressed_klass_ptrs() must be called after calling
1874 // set_use_compressed_oops().
1875 set_use_compressed_klass_ptrs();
1876
1877 // Also checks that certain machines are slower with compressed oops
1878 // in vm_version initialization code.
1879 #endif // _LP64
1880 #endif // !ZERO
1881
1882 CodeCacheExtensions::set_ergonomics_flags();
1883 }
1884
1885 void Arguments::set_parallel_gc_flags() {
1886 assert(UseParallelGC || UseParallelOldGC, "Error");
1887 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1888 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1889 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1890 }
1891 FLAG_SET_DEFAULT(UseParallelGC, true);
1892
1893 // If no heap maximum was requested explicitly, use some reasonable fraction
1894 // of the physical memory, up to a maximum of 1GB.
1895 FLAG_SET_DEFAULT(ParallelGCThreads,
1896 Abstract_VM_Version::parallel_worker_threads());
1897 if (ParallelGCThreads == 0) {
1898 jio_fprintf(defaultStream::error_stream(),
1899 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1900 vm_exit(1);
1901 }
1902
1903 if (UseAdaptiveSizePolicy) {
1904 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1905 // unless the user actually sets these flags.
1906 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1907 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1908 }
1909 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1910 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1911 }
1912 }
1913
1914 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1915 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1916 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1917 // See CR 6362902 for details.
1918 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1919 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1920 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1921 }
1922 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1923 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1924 }
1925 }
1926
1927 if (UseParallelOldGC) {
1928 // Par compact uses lower default values since they are treated as
1929 // minimums. These are different defaults because of the different
1930 // interpretation and are not ergonomically set.
1931 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1932 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1933 }
1934 }
1935 }
1936
1937 void Arguments::set_g1_gc_flags() {
1938 assert(UseG1GC, "Error");
1939 #if defined(COMPILER1) || INCLUDE_JVMCI
1940 FastTLABRefill = false;
1941 #endif
1942 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1943 if (ParallelGCThreads == 0) {
1944 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1945 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1946 }
1947
1948 #if INCLUDE_ALL_GCS
1949 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1950 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1951 }
1952 #endif
1953
1954 // MarkStackSize will be set (if it hasn't been set by the user)
1955 // when concurrent marking is initialized.
1956 // Its value will be based upon the number of parallel marking threads.
1957 // But we do set the maximum mark stack size here.
1958 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1959 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1960 }
1961
1962 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1963 // In G1, we want the default GC overhead goal to be higher than
1964 // it is for PS, or the heap might be expanded too aggressively.
1965 // We set it here to ~8%.
1966 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1967 }
1968
1969 // Below, we might need to calculate the pause time interval based on
1970 // the pause target. When we do so we are going to give G1 maximum
1971 // flexibility and allow it to do pauses when it needs to. So, we'll
1972 // arrange that the pause interval to be pause time target + 1 to
1973 // ensure that a) the pause time target is maximized with respect to
1974 // the pause interval and b) we maintain the invariant that pause
1975 // time target < pause interval. If the user does not want this
1976 // maximum flexibility, they will have to set the pause interval
1977 // explicitly.
1978
1979 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1980 // The default pause time target in G1 is 200ms
1981 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1982 }
1983
1984 // Then, if the interval parameter was not set, set it according to
1985 // the pause time target (this will also deal with the case when the
1986 // pause time target is the default value).
1987 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1988 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1989 }
1990
1991 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1992 }
1993
1994 void Arguments::set_gc_specific_flags() {
1995 #if INCLUDE_ALL_GCS
1996 // Set per-collector flags
1997 if (UseParallelGC || UseParallelOldGC) {
1998 set_parallel_gc_flags();
1999 } else if (UseConcMarkSweepGC) {
2000 set_cms_and_parnew_gc_flags();
2001 } else if (UseG1GC) {
2002 set_g1_gc_flags();
2003 }
2004 if (AssumeMP && !UseSerialGC) {
2005 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2006 warning("If the number of processors is expected to increase from one, then"
2007 " you should configure the number of parallel GC threads appropriately"
2008 " using -XX:ParallelGCThreads=N");
2009 }
2010 }
2011 if (MinHeapFreeRatio == 100) {
2012 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2013 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2014 }
2015
2016 // If class unloading is disabled, also disable concurrent class unloading.
2017 if (!ClassUnloading) {
2018 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2019 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2020 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2021 }
2022 #endif // INCLUDE_ALL_GCS
2023 }
2024
2025 julong Arguments::limit_by_allocatable_memory(julong limit) {
2026 julong max_allocatable;
2027 julong result = limit;
2028 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2029 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2030 }
2031 return result;
2032 }
2033
2034 // Use static initialization to get the default before parsing
2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2036
2037 void Arguments::set_heap_size() {
2038 julong phys_mem =
2039 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2040 : (julong)MaxRAM;
2041
2042 // Experimental support for CGroup memory limits
2043 if (UseCGroupMemoryLimitForHeap) {
2044 // This is a rough indicator that a CGroup limit may be in force
2045 // for this process
2046 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2047 FILE *fp = fopen(lim_file, "r");
2048 if (fp != NULL) {
2049 julong cgroup_max = 0;
2050 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2051 if (ret == 1 && cgroup_max > 0) {
2052 // If unlimited, cgroup_max will be a very large, but unspecified
2053 // value, so use initial phys_mem as a limit
2054 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2055 JULONG_FORMAT "MB) and initial phys_mem ("
2056 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2057 phys_mem = MIN2(cgroup_max, phys_mem);
2058 } else {
2059 warning("Unable to read/parse cgroup memory limit from %s: %s",
2060 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2061 }
2062 fclose(fp);
2063 } else {
2064 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2065 }
2066 }
2067
2068 // If the maximum heap size has not been set with -Xmx,
2069 // then set it as fraction of the size of physical memory,
2070 // respecting the maximum and minimum sizes of the heap.
2071 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2072 julong reasonable_max = phys_mem / MaxRAMFraction;
2073
2074 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2075 // Small physical memory, so use a minimum fraction of it for the heap
2076 reasonable_max = phys_mem / MinRAMFraction;
2077 } else {
2078 // Not-small physical memory, so require a heap at least
2079 // as large as MaxHeapSize
2080 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2081 }
2082 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2083 // Limit the heap size to ErgoHeapSizeLimit
2084 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2085 }
2086 if (UseCompressedOops) {
2087 // Limit the heap size to the maximum possible when using compressed oops
2088 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2089
2090 // HeapBaseMinAddress can be greater than default but not less than.
2091 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2092 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2093 // matches compressed oops printing flags
2094 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2095 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2096 DefaultHeapBaseMinAddress,
2097 DefaultHeapBaseMinAddress/G,
2098 HeapBaseMinAddress);
2099 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2100 }
2101 }
2102
2103 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2104 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2105 // but it should be not less than default MaxHeapSize.
2106 max_coop_heap -= HeapBaseMinAddress;
2107 }
2108 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2109 }
2110 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2111
2112 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2113 // An initial heap size was specified on the command line,
2114 // so be sure that the maximum size is consistent. Done
2115 // after call to limit_by_allocatable_memory because that
2116 // method might reduce the allocation size.
2117 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2118 }
2119
2120 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2121 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2122 }
2123
2124 // If the minimum or initial heap_size have not been set or requested to be set
2125 // ergonomically, set them accordingly.
2126 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2127 julong reasonable_minimum = (julong)(OldSize + NewSize);
2128
2129 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2130
2131 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2132
2133 if (InitialHeapSize == 0) {
2134 julong reasonable_initial = phys_mem / InitialRAMFraction;
2135
2136 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2137 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2138
2139 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2140
2141 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2142 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2143 }
2144 // If the minimum heap size has not been set (via -Xms),
2145 // synchronize with InitialHeapSize to avoid errors with the default value.
2146 if (min_heap_size() == 0) {
2147 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2148 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2149 }
2150 }
2151 }
2152
2153 // This option inspects the machine and attempts to set various
2154 // parameters to be optimal for long-running, memory allocation
2155 // intensive jobs. It is intended for machines with large
2156 // amounts of cpu and memory.
2157 jint Arguments::set_aggressive_heap_flags() {
2158 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2159 // VM, but we may not be able to represent the total physical memory
2160 // available (like having 8gb of memory on a box but using a 32bit VM).
2161 // Thus, we need to make sure we're using a julong for intermediate
2162 // calculations.
2163 julong initHeapSize;
2164 julong total_memory = os::physical_memory();
2165
2166 if (total_memory < (julong) 256 * M) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2169 vm_exit(1);
2170 }
2171
2172 // The heap size is half of available memory, or (at most)
2173 // all of possible memory less 160mb (leaving room for the OS
2174 // when using ISM). This is the maximum; because adaptive sizing
2175 // is turned on below, the actual space used may be smaller.
2176
2177 initHeapSize = MIN2(total_memory / (julong) 2,
2178 total_memory - (julong) 160 * M);
2179
2180 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2181
2182 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2183 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2187 return JNI_EINVAL;
2188 }
2189 // Currently the minimum size and the initial heap sizes are the same.
2190 set_min_heap_size(initHeapSize);
2191 }
2192 if (FLAG_IS_DEFAULT(NewSize)) {
2193 // Make the young generation 3/8ths of the total heap.
2194 if (FLAG_SET_CMDLINE(size_t, NewSize,
2195 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2196 return JNI_EINVAL;
2197 }
2198 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2199 return JNI_EINVAL;
2200 }
2201 }
2202
2203 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2204 FLAG_SET_DEFAULT(UseLargePages, true);
2205 #endif
2206
2207 // Increase some data structure sizes for efficiency
2208 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2209 return JNI_EINVAL;
2210 }
2211 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2212 return JNI_EINVAL;
2213 }
2214 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2215 return JNI_EINVAL;
2216 }
2217
2218 // See the OldPLABSize comment below, but replace 'after promotion'
2219 // with 'after copying'. YoungPLABSize is the size of the survivor
2220 // space per-gc-thread buffers. The default is 4kw.
2221 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2222 return JNI_EINVAL;
2223 }
2224
2225 // OldPLABSize is the size of the buffers in the old gen that
2226 // UseParallelGC uses to promote live data that doesn't fit in the
2227 // survivor spaces. At any given time, there's one for each gc thread.
2228 // The default size is 1kw. These buffers are rarely used, since the
2229 // survivor spaces are usually big enough. For specjbb, however, there
2230 // are occasions when there's lots of live data in the young gen
2231 // and we end up promoting some of it. We don't have a definite
2232 // explanation for why bumping OldPLABSize helps, but the theory
2233 // is that a bigger PLAB results in retaining something like the
2234 // original allocation order after promotion, which improves mutator
2235 // locality. A minor effect may be that larger PLABs reduce the
2236 // number of PLAB allocation events during gc. The value of 8kw
2237 // was arrived at by experimenting with specjbb.
2238 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2239 return JNI_EINVAL;
2240 }
2241
2242 // Enable parallel GC and adaptive generation sizing
2243 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2244 return JNI_EINVAL;
2245 }
2246 FLAG_SET_DEFAULT(ParallelGCThreads,
2247 Abstract_VM_Version::parallel_worker_threads());
2248
2249 // Encourage steady state memory management
2250 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2251 return JNI_EINVAL;
2252 }
2253
2254 // This appears to improve mutator locality
2255 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2256 return JNI_EINVAL;
2257 }
2258
2259 // Get around early Solaris scheduling bug
2260 // (affinity vs other jobs on system)
2261 // but disallow DR and offlining (5008695).
2262 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2263 return JNI_EINVAL;
2264 }
2265
2266 return JNI_OK;
2267 }
2268
2269 // This must be called after ergonomics.
2270 void Arguments::set_bytecode_flags() {
2271 if (!RewriteBytecodes) {
2272 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2273 }
2274 }
2275
2276 // Aggressive optimization flags -XX:+AggressiveOpts
2277 jint Arguments::set_aggressive_opts_flags() {
2278 #ifdef COMPILER2
2279 if (AggressiveUnboxing) {
2280 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2281 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2282 } else if (!EliminateAutoBox) {
2283 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2284 AggressiveUnboxing = false;
2285 }
2286 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2287 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2288 } else if (!DoEscapeAnalysis) {
2289 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2290 AggressiveUnboxing = false;
2291 }
2292 }
2293 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2294 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2295 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2296 }
2297 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2298 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2299 }
2300
2301 // Feed the cache size setting into the JDK
2302 char buffer[1024];
2303 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2304 if (!add_property(buffer)) {
2305 return JNI_ENOMEM;
2306 }
2307 }
2308 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2309 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2310 }
2311 #endif
2312
2313 if (AggressiveOpts) {
2314 // Sample flag setting code
2315 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2316 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2317 // }
2318 }
2319
2320 return JNI_OK;
2321 }
2322
2323 //===========================================================================================================
2324 // Parsing of java.compiler property
2325
2326 void Arguments::process_java_compiler_argument(const char* arg) {
2327 // For backwards compatibility, Djava.compiler=NONE or ""
2328 // causes us to switch to -Xint mode UNLESS -Xdebug
2329 // is also specified.
2330 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2331 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2332 }
2333 }
2334
2335 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2336 _sun_java_launcher = os::strdup_check_oom(launcher);
2337 }
2338
2339 bool Arguments::created_by_java_launcher() {
2340 assert(_sun_java_launcher != NULL, "property must have value");
2341 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2342 }
2343
2344 bool Arguments::sun_java_launcher_is_altjvm() {
2345 return _sun_java_launcher_is_altjvm;
2346 }
2347
2348 //===========================================================================================================
2349 // Parsing of main arguments
2350
2351 #if INCLUDE_JVMCI
2352 // Check consistency of jvmci vm argument settings.
2353 bool Arguments::check_jvmci_args_consistency() {
2354 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2355 }
2356 #endif //INCLUDE_JVMCI
2357
2358 // Check consistency of GC selection
2359 bool Arguments::check_gc_consistency() {
2360 // Ensure that the user has not selected conflicting sets
2361 // of collectors.
2362 uint i = 0;
2363 if (UseSerialGC) i++;
2364 if (UseConcMarkSweepGC) i++;
2365 if (UseParallelGC || UseParallelOldGC) i++;
2366 if (UseG1GC) i++;
2367 if (i > 1) {
2368 jio_fprintf(defaultStream::error_stream(),
2369 "Conflicting collector combinations in option list; "
2370 "please refer to the release notes for the combinations "
2371 "allowed\n");
2372 return false;
2373 }
2374
2375 if (UseConcMarkSweepGC && !UseParNewGC) {
2376 jio_fprintf(defaultStream::error_stream(),
2377 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2378 return false;
2379 }
2380
2381 if (UseParNewGC && !UseConcMarkSweepGC) {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2384 return false;
2385 }
2386
2387 return true;
2388 }
2389
2390 // Check the consistency of vm_init_args
2391 bool Arguments::check_vm_args_consistency() {
2392 // Method for adding checks for flag consistency.
2393 // The intent is to warn the user of all possible conflicts,
2394 // before returning an error.
2395 // Note: Needs platform-dependent factoring.
2396 bool status = true;
2397
2398 if (TLABRefillWasteFraction == 0) {
2399 jio_fprintf(defaultStream::error_stream(),
2400 "TLABRefillWasteFraction should be a denominator, "
2401 "not " SIZE_FORMAT "\n",
2402 TLABRefillWasteFraction);
2403 status = false;
2404 }
2405
2406 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2407 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2408 }
2409
2410 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2411 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2412 }
2413
2414 if (GCTimeLimit == 100) {
2415 // Turn off gc-overhead-limit-exceeded checks
2416 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2417 }
2418
2419 status = status && check_gc_consistency();
2420
2421 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2422 // insists that we hold the requisite locks so that the iteration is
2423 // MT-safe. For the verification at start-up and shut-down, we don't
2424 // yet have a good way of acquiring and releasing these locks,
2425 // which are not visible at the CollectedHeap level. We want to
2426 // be able to acquire these locks and then do the iteration rather
2427 // than just disable the lock verification. This will be fixed under
2428 // bug 4788986.
2429 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2430 if (VerifyDuringStartup) {
2431 warning("Heap verification at start-up disabled "
2432 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2433 VerifyDuringStartup = false; // Disable verification at start-up
2434 }
2435
2436 if (VerifyBeforeExit) {
2437 warning("Heap verification at shutdown disabled "
2438 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2439 VerifyBeforeExit = false; // Disable verification at shutdown
2440 }
2441 }
2442
2443 if (PrintNMTStatistics) {
2444 #if INCLUDE_NMT
2445 if (MemTracker::tracking_level() == NMT_off) {
2446 #endif // INCLUDE_NMT
2447 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2448 PrintNMTStatistics = false;
2449 #if INCLUDE_NMT
2450 }
2451 #endif
2452 }
2453 #if INCLUDE_JVMCI
2454
2455 status = status && check_jvmci_args_consistency();
2456
2457 if (EnableJVMCI) {
2458 if (!ScavengeRootsInCode) {
2459 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2460 ScavengeRootsInCode = 1;
2461 }
2462 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2463 TypeProfileLevel = 0;
2464 }
2465 if (UseJVMCICompiler) {
2466 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2467 TypeProfileWidth = 8;
2468 }
2469 }
2470 }
2471 #endif
2472
2473 // Check lower bounds of the code cache
2474 // Template Interpreter code is approximately 3X larger in debug builds.
2475 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2476 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2479 os::vm_page_size()/K);
2480 status = false;
2481 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2484 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2485 status = false;
2486 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2489 min_code_cache_size/K);
2490 status = false;
2491 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2492 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2495 CODE_CACHE_SIZE_LIMIT/M);
2496 status = false;
2497 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2500 min_code_cache_size/K);
2501 status = false;
2502 }
2503
2504 #ifdef _LP64
2505 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2506 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2507 }
2508 #endif
2509
2510 #ifndef SUPPORT_RESERVED_STACK_AREA
2511 if (StackReservedPages != 0) {
2512 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2513 warning("Reserved Stack Area not supported on this platform");
2514 }
2515 #endif
2516
2517 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2518 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2519 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2520 }
2521 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2522 }
2523 if (UseCompiler && is_interpreter_only()) {
2524 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2525 warning("UseCompiler disabled due to -Xint.");
2526 }
2527 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2528 }
2529 #ifdef COMPILER2
2530 if (PostLoopMultiversioning && !RangeCheckElimination) {
2531 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2532 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2533 }
2534 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2535 }
2536 #endif
2537 return status;
2538 }
2539
2540 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2541 const char* option_type) {
2542 if (ignore) return false;
2543
2544 const char* spacer = " ";
2545 if (option_type == NULL) {
2546 option_type = ++spacer; // Set both to the empty string.
2547 }
2548
2549 if (os::obsolete_option(option)) {
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Obsolete %s%soption: %s\n", option_type, spacer,
2552 option->optionString);
2553 return false;
2554 } else {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Unrecognized %s%soption: %s\n", option_type, spacer,
2557 option->optionString);
2558 return true;
2559 }
2560 }
2561
2562 static const char* user_assertion_options[] = {
2563 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2564 };
2565
2566 static const char* system_assertion_options[] = {
2567 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2568 };
2569
2570 bool Arguments::parse_uintx(const char* value,
2571 uintx* uintx_arg,
2572 uintx min_size) {
2573
2574 // Check the sign first since atojulong() parses only unsigned values.
2575 bool value_is_positive = !(*value == '-');
2576
2577 if (value_is_positive) {
2578 julong n;
2579 bool good_return = atojulong(value, &n);
2580 if (good_return) {
2581 bool above_minimum = n >= min_size;
2582 bool value_is_too_large = n > max_uintx;
2583
2584 if (above_minimum && !value_is_too_large) {
2585 *uintx_arg = n;
2586 return true;
2587 }
2588 }
2589 }
2590 return false;
2591 }
2592
2593 unsigned int addreads_count = 0;
2594 unsigned int addexports_count = 0;
2595 unsigned int addmods_count = 0;
2596 unsigned int patch_mod_count = 0;
2597
2598 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2599 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2600 char* property = AllocateHeap(prop_len, mtArguments);
2601 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2602 if (ret < 0 || ret >= (int)prop_len) {
2603 FreeHeap(property);
2604 return false;
2605 }
2606 bool added = add_property(property, UnwriteableProperty, internal);
2607 FreeHeap(property);
2608 return added;
2609 }
2610
2611 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2612 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2613 if (count < 1000) {
2614 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2615 char* property = AllocateHeap(prop_len, mtArguments);
2616 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2617 if (ret < 0 || ret >= (int)prop_len) {
2618 FreeHeap(property);
2619 return false;
2620 }
2621 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2622 FreeHeap(property);
2623 return added;
2624 }
2625 return false;
2626 }
2627
2628 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2629 julong* long_arg,
2630 julong min_size) {
2631 if (!atojulong(s, long_arg)) return arg_unreadable;
2632 return check_memory_size(*long_arg, min_size);
2633 }
2634
2635 // Parse JavaVMInitArgs structure
2636
2637 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2638 const JavaVMInitArgs *java_options_args,
2639 const JavaVMInitArgs *cmd_line_args) {
2640 bool patch_mod_javabase = false;
2641
2642 // Save default settings for some mode flags
2643 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2644 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2645 Arguments::_ClipInlining = ClipInlining;
2646 Arguments::_BackgroundCompilation = BackgroundCompilation;
2647 if (TieredCompilation) {
2648 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2649 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2650 }
2651
2652 // Setup flags for mixed which is the default
2653 set_mode_flags(_mixed);
2654
2655 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2656 // variable (if present).
2657 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2658 if (result != JNI_OK) {
2659 return result;
2660 }
2661
2662 // Parse args structure generated from the command line flags.
2663 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2664 if (result != JNI_OK) {
2665 return result;
2666 }
2667
2668 // Parse args structure generated from the _JAVA_OPTIONS environment
2669 // variable (if present) (mimics classic VM)
2670 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2671 if (result != JNI_OK) {
2672 return result;
2673 }
2674
2675 // Do final processing now that all arguments have been parsed
2676 result = finalize_vm_init_args();
2677 if (result != JNI_OK) {
2678 return result;
2679 }
2680
2681 return JNI_OK;
2682 }
2683
2684 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2685 // represents a valid JDWP agent. is_path==true denotes that we
2686 // are dealing with -agentpath (case where name is a path), otherwise with
2687 // -agentlib
2688 bool valid_jdwp_agent(char *name, bool is_path) {
2689 char *_name;
2690 const char *_jdwp = "jdwp";
2691 size_t _len_jdwp, _len_prefix;
2692
2693 if (is_path) {
2694 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2695 return false;
2696 }
2697
2698 _name++; // skip past last path separator
2699 _len_prefix = strlen(JNI_LIB_PREFIX);
2700
2701 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2702 return false;
2703 }
2704
2705 _name += _len_prefix;
2706 _len_jdwp = strlen(_jdwp);
2707
2708 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2709 _name += _len_jdwp;
2710 }
2711 else {
2712 return false;
2713 }
2714
2715 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2716 return false;
2717 }
2718
2719 return true;
2720 }
2721
2722 if (strcmp(name, _jdwp) == 0) {
2723 return true;
2724 }
2725
2726 return false;
2727 }
2728
2729 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2730 // --patch-module=<module>=<file>(<pathsep><file>)*
2731 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2732 // Find the equal sign between the module name and the path specification
2733 const char* module_equal = strchr(patch_mod_tail, '=');
2734 if (module_equal == NULL) {
2735 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2736 return JNI_ERR;
2737 } else {
2738 // Pick out the module name
2739 size_t module_len = module_equal - patch_mod_tail;
2740 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2741 if (module_name != NULL) {
2742 memcpy(module_name, patch_mod_tail, module_len);
2743 *(module_name + module_len) = '\0';
2744 // The path piece begins one past the module_equal sign
2745 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2746 FREE_C_HEAP_ARRAY(char, module_name);
2747 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2748 return JNI_ENOMEM;
2749 }
2750 } else {
2751 return JNI_ENOMEM;
2752 }
2753 }
2754 return JNI_OK;
2755 }
2756
2757 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2758 // For match_option to return remaining or value part of option string
2759 const char* tail;
2760
2761 // iterate over arguments
2762 for (int index = 0; index < args->nOptions; index++) {
2763 bool is_absolute_path = false; // for -agentpath vs -agentlib
2764
2765 const JavaVMOption* option = args->options + index;
2766
2767 if (!match_option(option, "-Djava.class.path", &tail) &&
2768 !match_option(option, "-Dsun.java.command", &tail) &&
2769 !match_option(option, "-Dsun.java.launcher", &tail)) {
2770
2771 // add all jvm options to the jvm_args string. This string
2772 // is used later to set the java.vm.args PerfData string constant.
2773 // the -Djava.class.path and the -Dsun.java.command options are
2774 // omitted from jvm_args string as each have their own PerfData
2775 // string constant object.
2776 build_jvm_args(option->optionString);
2777 }
2778
2779 // -verbose:[class/gc/jni]
2780 if (match_option(option, "-verbose", &tail)) {
2781 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2782 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2783 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2784 } else if (!strcmp(tail, ":gc")) {
2785 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2786 } else if (!strcmp(tail, ":jni")) {
2787 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 }
2791 // -da / -ea / -disableassertions / -enableassertions
2792 // These accept an optional class/package name separated by a colon, e.g.,
2793 // -da:java.lang.Thread.
2794 } else if (match_option(option, user_assertion_options, &tail, true)) {
2795 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2796 if (*tail == '\0') {
2797 JavaAssertions::setUserClassDefault(enable);
2798 } else {
2799 assert(*tail == ':', "bogus match by match_option()");
2800 JavaAssertions::addOption(tail + 1, enable);
2801 }
2802 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2803 } else if (match_option(option, system_assertion_options, &tail, false)) {
2804 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2805 JavaAssertions::setSystemClassDefault(enable);
2806 // -bootclasspath:
2807 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2808 jio_fprintf(defaultStream::output_stream(),
2809 "-Xbootclasspath is no longer a supported option.\n");
2810 return JNI_EINVAL;
2811 // -bootclasspath/a:
2812 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2813 Arguments::append_sysclasspath(tail);
2814 // -bootclasspath/p:
2815 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2816 jio_fprintf(defaultStream::output_stream(),
2817 "-Xbootclasspath/p is no longer a supported option.\n");
2818 return JNI_EINVAL;
2819 // -Xrun
2820 } else if (match_option(option, "-Xrun", &tail)) {
2821 if (tail != NULL) {
2822 const char* pos = strchr(tail, ':');
2823 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2824 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2825 jio_snprintf(name, len + 1, "%s", tail);
2826
2827 char *options = NULL;
2828 if(pos != NULL) {
2829 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2830 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2831 }
2832 #if !INCLUDE_JVMTI
2833 if (strcmp(name, "jdwp") == 0) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Debugging agents are not supported in this VM\n");
2836 return JNI_ERR;
2837 }
2838 #endif // !INCLUDE_JVMTI
2839 add_init_library(name, options);
2840 }
2841 } else if (match_option(option, "--add-reads=", &tail)) {
2842 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2843 return JNI_ENOMEM;
2844 }
2845 } else if (match_option(option, "--add-exports=", &tail)) {
2846 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2847 return JNI_ENOMEM;
2848 }
2849 } else if (match_option(option, "--add-modules=", &tail)) {
2850 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2851 return JNI_ENOMEM;
2852 }
2853 } else if (match_option(option, "--limit-modules=", &tail)) {
2854 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2855 return JNI_ENOMEM;
2856 }
2857 } else if (match_option(option, "--module-path=", &tail)) {
2858 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2859 return JNI_ENOMEM;
2860 }
2861 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2862 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2863 return JNI_ENOMEM;
2864 }
2865 } else if (match_option(option, "--patch-module=", &tail)) {
2866 // --patch-module=<module>=<file>(<pathsep><file>)*
2867 int res = process_patch_mod_option(tail, patch_mod_javabase);
2868 if (res != JNI_OK) {
2869 return res;
2870 }
2871 // -agentlib and -agentpath
2872 } else if (match_option(option, "-agentlib:", &tail) ||
2873 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2874 if(tail != NULL) {
2875 const char* pos = strchr(tail, '=');
2876 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2877 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2878 name[len] = '\0';
2879
2880 char *options = NULL;
2881 if(pos != NULL) {
2882 options = os::strdup_check_oom(pos + 1, mtArguments);
2883 }
2884 #if !INCLUDE_JVMTI
2885 if (valid_jdwp_agent(name, is_absolute_path)) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Debugging agents are not supported in this VM\n");
2888 return JNI_ERR;
2889 }
2890 #endif // !INCLUDE_JVMTI
2891 add_init_agent(name, options, is_absolute_path);
2892 }
2893 // -javaagent
2894 } else if (match_option(option, "-javaagent:", &tail)) {
2895 #if !INCLUDE_JVMTI
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Instrumentation agents are not supported in this VM\n");
2898 return JNI_ERR;
2899 #else
2900 if (tail != NULL) {
2901 size_t length = strlen(tail) + 1;
2902 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2903 jio_snprintf(options, length, "%s", tail);
2904 add_init_agent("instrument", options, false);
2905 // java agents need module java.instrument
2906 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2907 return JNI_ENOMEM;
2908 }
2909 }
2910 #endif // !INCLUDE_JVMTI
2911 // -Xnoclassgc
2912 } else if (match_option(option, "-Xnoclassgc")) {
2913 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // -Xconcgc
2917 } else if (match_option(option, "-Xconcgc")) {
2918 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2922 // -Xnoconcgc
2923 } else if (match_option(option, "-Xnoconcgc")) {
2924 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2928 // -Xbatch
2929 } else if (match_option(option, "-Xbatch")) {
2930 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 // -Xmn for compatibility with other JVM vendors
2934 } else if (match_option(option, "-Xmn", &tail)) {
2935 julong long_initial_young_size = 0;
2936 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2937 if (errcode != arg_in_range) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid initial young generation size: %s\n", option->optionString);
2940 describe_range_error(errcode);
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949 // -Xms
2950 } else if (match_option(option, "-Xms", &tail)) {
2951 julong long_initial_heap_size = 0;
2952 // an initial heap size of 0 means automatically determine
2953 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2954 if (errcode != arg_in_range) {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "Invalid initial heap size: %s\n", option->optionString);
2957 describe_range_error(errcode);
2958 return JNI_EINVAL;
2959 }
2960 set_min_heap_size((size_t)long_initial_heap_size);
2961 // Currently the minimum size and the initial heap sizes are the same.
2962 // Can be overridden with -XX:InitialHeapSize.
2963 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 // -Xmx
2967 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2968 julong long_max_heap_size = 0;
2969 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2970 if (errcode != arg_in_range) {
2971 jio_fprintf(defaultStream::error_stream(),
2972 "Invalid maximum heap size: %s\n", option->optionString);
2973 describe_range_error(errcode);
2974 return JNI_EINVAL;
2975 }
2976 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 // Xmaxf
2980 } else if (match_option(option, "-Xmaxf", &tail)) {
2981 char* err;
2982 int maxf = (int)(strtod(tail, &err) * 100);
2983 if (*err != '\0' || *tail == '\0') {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "Bad max heap free percentage size: %s\n",
2986 option->optionString);
2987 return JNI_EINVAL;
2988 } else {
2989 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 }
2993 // Xminf
2994 } else if (match_option(option, "-Xminf", &tail)) {
2995 char* err;
2996 int minf = (int)(strtod(tail, &err) * 100);
2997 if (*err != '\0' || *tail == '\0') {
2998 jio_fprintf(defaultStream::error_stream(),
2999 "Bad min heap free percentage size: %s\n",
3000 option->optionString);
3001 return JNI_EINVAL;
3002 } else {
3003 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 }
3007 // -Xss
3008 } else if (match_option(option, "-Xss", &tail)) {
3009 julong long_ThreadStackSize = 0;
3010 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3011 if (errcode != arg_in_range) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Invalid thread stack size: %s\n", option->optionString);
3014 describe_range_error(errcode);
3015 return JNI_EINVAL;
3016 }
3017 // Internally track ThreadStackSize in units of 1024 bytes.
3018 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3019 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3023 } else if (match_option(option, "-Xoss", &tail) ||
3024 match_option(option, "-Xsqnopause") ||
3025 match_option(option, "-Xoptimize") ||
3026 match_option(option, "-Xboundthreads") ||
3027 match_option(option, "-Xusealtsigs")) {
3028 // All these options are deprecated in JDK 9 and will be removed in a future release
3029 char version[256];
3030 JDK_Version::jdk(9).to_string(version, sizeof(version));
3031 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3032 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3033 julong long_CodeCacheExpansionSize = 0;
3034 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3035 if (errcode != arg_in_range) {
3036 jio_fprintf(defaultStream::error_stream(),
3037 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3038 os::vm_page_size()/K);
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3045 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3046 julong long_ReservedCodeCacheSize = 0;
3047
3048 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3049 if (errcode != arg_in_range) {
3050 jio_fprintf(defaultStream::error_stream(),
3051 "Invalid maximum code cache size: %s.\n", option->optionString);
3052 return JNI_EINVAL;
3053 }
3054 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 // -XX:NonNMethodCodeHeapSize=
3058 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3059 julong long_NonNMethodCodeHeapSize = 0;
3060
3061 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3062 if (errcode != arg_in_range) {
3063 jio_fprintf(defaultStream::error_stream(),
3064 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3065 return JNI_EINVAL;
3066 }
3067 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 // -XX:ProfiledCodeHeapSize=
3071 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3072 julong long_ProfiledCodeHeapSize = 0;
3073
3074 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3075 if (errcode != arg_in_range) {
3076 jio_fprintf(defaultStream::error_stream(),
3077 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3078 return JNI_EINVAL;
3079 }
3080 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 // -XX:NonProfiledCodeHeapSizee=
3084 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3085 julong long_NonProfiledCodeHeapSize = 0;
3086
3087 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3088 if (errcode != arg_in_range) {
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3091 return JNI_EINVAL;
3092 }
3093 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 // -green
3097 } else if (match_option(option, "-green")) {
3098 jio_fprintf(defaultStream::error_stream(),
3099 "Green threads support not available\n");
3100 return JNI_EINVAL;
3101 // -native
3102 } else if (match_option(option, "-native")) {
3103 // HotSpot always uses native threads, ignore silently for compatibility
3104 // -Xrs
3105 } else if (match_option(option, "-Xrs")) {
3106 // Classic/EVM option, new functionality
3107 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 // -Xprof
3111 } else if (match_option(option, "-Xprof")) {
3112 #if INCLUDE_FPROF
3113 _has_profile = true;
3114 #else // INCLUDE_FPROF
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Flat profiling is not supported in this VM.\n");
3117 return JNI_ERR;
3118 #endif // INCLUDE_FPROF
3119 // -Xconcurrentio
3120 } else if (match_option(option, "-Xconcurrentio")) {
3121 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3134 return JNI_EINVAL;
3135 }
3136
3137 // -Xinternalversion
3138 } else if (match_option(option, "-Xinternalversion")) {
3139 jio_fprintf(defaultStream::output_stream(), "%s\n",
3140 VM_Version::internal_vm_info_string());
3141 vm_exit(0);
3142 #ifndef PRODUCT
3143 // -Xprintflags
3144 } else if (match_option(option, "-Xprintflags")) {
3145 CommandLineFlags::printFlags(tty, false);
3146 vm_exit(0);
3147 #endif
3148 // -D
3149 } else if (match_option(option, "-D", &tail)) {
3150 const char* value;
3151 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3152 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3153 // abort if -Djava.endorsed.dirs is set
3154 jio_fprintf(defaultStream::output_stream(),
3155 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3156 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3157 return JNI_EINVAL;
3158 }
3159 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3160 *value != '\0' && strcmp(value, "\"\"") != 0) {
3161 // abort if -Djava.ext.dirs is set
3162 jio_fprintf(defaultStream::output_stream(),
3163 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3164 return JNI_EINVAL;
3165 }
3166 // Check for module related properties. They must be set using the modules
3167 // options. For example: use "--add-modules=java.sql", not
3168 // "-Djdk.module.addmods=java.sql"
3169 if (is_internal_module_property(option->optionString + 2)) {
3170 needs_module_property_warning = true;
3171 continue;
3172 }
3173
3174 if (!add_property(tail)) {
3175 return JNI_ENOMEM;
3176 }
3177 // Out of the box management support
3178 if (match_option(option, "-Dcom.sun.management", &tail)) {
3179 #if INCLUDE_MANAGEMENT
3180 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 // management agent in module java.management
3184 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3185 return JNI_ENOMEM;
3186 }
3187 #else
3188 jio_fprintf(defaultStream::output_stream(),
3189 "-Dcom.sun.management is not supported in this VM.\n");
3190 return JNI_ERR;
3191 #endif
3192 }
3193 // -Xint
3194 } else if (match_option(option, "-Xint")) {
3195 set_mode_flags(_int);
3196 // -Xmixed
3197 } else if (match_option(option, "-Xmixed")) {
3198 set_mode_flags(_mixed);
3199 // -Xcomp
3200 } else if (match_option(option, "-Xcomp")) {
3201 // for testing the compiler; turn off all flags that inhibit compilation
3202 set_mode_flags(_comp);
3203 // -Xshare:dump
3204 } else if (match_option(option, "-Xshare:dump")) {
3205 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3206 return JNI_EINVAL;
3207 }
3208 set_mode_flags(_int); // Prevent compilation, which creates objects
3209 // -Xshare:on
3210 } else if (match_option(option, "-Xshare:on")) {
3211 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3215 return JNI_EINVAL;
3216 }
3217 // -Xshare:auto
3218 } else if (match_option(option, "-Xshare:auto")) {
3219 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3223 return JNI_EINVAL;
3224 }
3225 // -Xshare:off
3226 } else if (match_option(option, "-Xshare:off")) {
3227 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 // -Xverify
3234 } else if (match_option(option, "-Xverify", &tail)) {
3235 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3236 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3237 return JNI_EINVAL;
3238 }
3239 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3240 return JNI_EINVAL;
3241 }
3242 } else if (strcmp(tail, ":remote") == 0) {
3243 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3244 return JNI_EINVAL;
3245 }
3246 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3247 return JNI_EINVAL;
3248 }
3249 } else if (strcmp(tail, ":none") == 0) {
3250 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3251 return JNI_EINVAL;
3252 }
3253 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3254 return JNI_EINVAL;
3255 }
3256 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3257 return JNI_EINVAL;
3258 }
3259 // -Xdebug
3260 } else if (match_option(option, "-Xdebug")) {
3261 // note this flag has been used, then ignore
3262 set_xdebug_mode(true);
3263 // -Xnoagent
3264 } else if (match_option(option, "-Xnoagent")) {
3265 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3266 } else if (match_option(option, "-Xloggc:", &tail)) {
3267 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3268 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3269 _gc_log_filename = os::strdup_check_oom(tail);
3270 } else if (match_option(option, "-Xlog", &tail)) {
3271 bool ret = false;
3272 if (strcmp(tail, ":help") == 0) {
3273 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3274 vm_exit(0);
3275 } else if (strcmp(tail, ":disable") == 0) {
3276 LogConfiguration::disable_logging();
3277 ret = true;
3278 } else if (*tail == '\0') {
3279 ret = LogConfiguration::parse_command_line_arguments();
3280 assert(ret, "-Xlog without arguments should never fail to parse");
3281 } else if (*tail == ':') {
3282 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3283 }
3284 if (ret == false) {
3285 jio_fprintf(defaultStream::error_stream(),
3286 "Invalid -Xlog option '-Xlog%s'\n",
3287 tail);
3288 return JNI_EINVAL;
3289 }
3290 // JNI hooks
3291 } else if (match_option(option, "-Xcheck", &tail)) {
3292 if (!strcmp(tail, ":jni")) {
3293 #if !INCLUDE_JNI_CHECK
3294 warning("JNI CHECKING is not supported in this VM");
3295 #else
3296 CheckJNICalls = true;
3297 #endif // INCLUDE_JNI_CHECK
3298 } else if (is_bad_option(option, args->ignoreUnrecognized,
3299 "check")) {
3300 return JNI_EINVAL;
3301 }
3302 } else if (match_option(option, "vfprintf")) {
3303 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3304 } else if (match_option(option, "exit")) {
3305 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3306 } else if (match_option(option, "abort")) {
3307 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3308 // -XX:+AggressiveHeap
3309 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3310 jint result = set_aggressive_heap_flags();
3311 if (result != JNI_OK) {
3312 return result;
3313 }
3314 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3315 // and the last option wins.
3316 } else if (match_option(option, "-XX:+NeverTenure")) {
3317 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3321 return JNI_EINVAL;
3322 }
3323 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3324 return JNI_EINVAL;
3325 }
3326 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3327 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3328 return JNI_EINVAL;
3329 }
3330 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3331 return JNI_EINVAL;
3332 }
3333 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3334 return JNI_EINVAL;
3335 }
3336 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3337 uintx max_tenuring_thresh = 0;
3338 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3339 jio_fprintf(defaultStream::error_stream(),
3340 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3341 return JNI_EINVAL;
3342 }
3343
3344 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3345 return JNI_EINVAL;
3346 }
3347
3348 if (MaxTenuringThreshold == 0) {
3349 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3350 return JNI_EINVAL;
3351 }
3352 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 } else {
3356 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3357 return JNI_EINVAL;
3358 }
3359 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3360 return JNI_EINVAL;
3361 }
3362 }
3363 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3364 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3365 return JNI_EINVAL;
3366 }
3367 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3368 return JNI_EINVAL;
3369 }
3370 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3371 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3378 #if defined(DTRACE_ENABLED)
3379 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3380 return JNI_EINVAL;
3381 }
3382 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3386 return JNI_EINVAL;
3387 }
3388 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3389 return JNI_EINVAL;
3390 }
3391 #else // defined(DTRACE_ENABLED)
3392 jio_fprintf(defaultStream::error_stream(),
3393 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3394 return JNI_EINVAL;
3395 #endif // defined(DTRACE_ENABLED)
3396 #ifdef ASSERT
3397 } else if (match_option(option, "-XX:+FullGCALot")) {
3398 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3399 return JNI_EINVAL;
3400 }
3401 // disable scavenge before parallel mark-compact
3402 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3403 return JNI_EINVAL;
3404 }
3405 #endif
3406 #if !INCLUDE_MANAGEMENT
3407 } else if (match_option(option, "-XX:+ManagementServer")) {
3408 jio_fprintf(defaultStream::error_stream(),
3409 "ManagementServer is not supported in this VM.\n");
3410 return JNI_ERR;
3411 #endif // INCLUDE_MANAGEMENT
3412 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3413 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3414 // already been handled
3415 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3416 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3417 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3418 return JNI_EINVAL;
3419 }
3420 }
3421 // Unknown option
3422 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3423 return JNI_ERR;
3424 }
3425 }
3426
3427 // PrintSharedArchiveAndExit will turn on
3428 // -Xshare:on
3429 // -Xlog:class+path=info
3430 if (PrintSharedArchiveAndExit) {
3431 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3432 return JNI_EINVAL;
3433 }
3434 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3435 return JNI_EINVAL;
3436 }
3437 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3438 }
3439
3440 // Change the default value for flags which have different default values
3441 // when working with older JDKs.
3442 #ifdef LINUX
3443 if (JDK_Version::current().compare_major(6) <= 0 &&
3444 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3445 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3446 }
3447 #endif // LINUX
3448 fix_appclasspath();
3449 return JNI_OK;
3450 }
3451
3452 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3453 // For java.base check for duplicate --patch-module options being specified on the command line.
3454 // This check is only required for java.base, all other duplicate module specifications
3455 // will be checked during module system initialization. The module system initialization
3456 // will throw an ExceptionInInitializerError if this situation occurs.
3457 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3458 if (*patch_mod_javabase) {
3459 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3460 } else {
3461 *patch_mod_javabase = true;
3462 }
3463 }
3464
3465 // Create GrowableArray lazily, only if --patch-module has been specified
3466 if (_patch_mod_prefix == NULL) {
3467 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3468 }
3469
3470 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3471 }
3472
3473 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3474 //
3475 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3476 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3477 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3478 // path is treated as the current directory.
3479 //
3480 // This causes problems with CDS, which requires that all directories specified in the classpath
3481 // must be empty. In most cases, applications do NOT want to load classes from the current
3482 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3483 // scripts compatible with CDS.
3484 void Arguments::fix_appclasspath() {
3485 if (IgnoreEmptyClassPaths) {
3486 const char separator = *os::path_separator();
3487 const char* src = _java_class_path->value();
3488
3489 // skip over all the leading empty paths
3490 while (*src == separator) {
3491 src ++;
3492 }
3493
3494 char* copy = os::strdup_check_oom(src, mtArguments);
3495
3496 // trim all trailing empty paths
3497 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3498 *tail = '\0';
3499 }
3500
3501 char from[3] = {separator, separator, '\0'};
3502 char to [2] = {separator, '\0'};
3503 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3504 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3505 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3506 }
3507
3508 _java_class_path->set_writeable_value(copy);
3509 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3510 }
3511 }
3512
3513 static bool has_jar_files(const char* directory) {
3514 DIR* dir = os::opendir(directory);
3515 if (dir == NULL) return false;
3516
3517 struct dirent *entry;
3518 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3519 bool hasJarFile = false;
3520 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3521 const char* name = entry->d_name;
3522 const char* ext = name + strlen(name) - 4;
3523 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3524 }
3525 FREE_C_HEAP_ARRAY(char, dbuf);
3526 os::closedir(dir);
3527 return hasJarFile ;
3528 }
3529
3530 static int check_non_empty_dirs(const char* path) {
3531 const char separator = *os::path_separator();
3532 const char* const end = path + strlen(path);
3533 int nonEmptyDirs = 0;
3534 while (path < end) {
3535 const char* tmp_end = strchr(path, separator);
3536 if (tmp_end == NULL) {
3537 if (has_jar_files(path)) {
3538 nonEmptyDirs++;
3539 jio_fprintf(defaultStream::output_stream(),
3540 "Non-empty directory: %s\n", path);
3541 }
3542 path = end;
3543 } else {
3544 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3545 memcpy(dirpath, path, tmp_end - path);
3546 dirpath[tmp_end - path] = '\0';
3547 if (has_jar_files(dirpath)) {
3548 nonEmptyDirs++;
3549 jio_fprintf(defaultStream::output_stream(),
3550 "Non-empty directory: %s\n", dirpath);
3551 }
3552 FREE_C_HEAP_ARRAY(char, dirpath);
3553 path = tmp_end + 1;
3554 }
3555 }
3556 return nonEmptyDirs;
3557 }
3558
3559 jint Arguments::finalize_vm_init_args() {
3560 // check if the default lib/endorsed directory exists; if so, error
3561 char path[JVM_MAXPATHLEN];
3562 const char* fileSep = os::file_separator();
3563 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3564
3565 if (CheckEndorsedAndExtDirs) {
3566 int nonEmptyDirs = 0;
3567 // check endorsed directory
3568 nonEmptyDirs += check_non_empty_dirs(path);
3569 // check the extension directories
3570 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3571 if (nonEmptyDirs > 0) {
3572 return JNI_ERR;
3573 }
3574 }
3575
3576 DIR* dir = os::opendir(path);
3577 if (dir != NULL) {
3578 jio_fprintf(defaultStream::output_stream(),
3579 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3580 "in modular form will be supported via the concept of upgradeable modules.\n");
3581 os::closedir(dir);
3582 return JNI_ERR;
3583 }
3584
3585 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3586 dir = os::opendir(path);
3587 if (dir != NULL) {
3588 jio_fprintf(defaultStream::output_stream(),
3589 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3590 "Use -classpath instead.\n.");
3591 os::closedir(dir);
3592 return JNI_ERR;
3593 }
3594
3595 // This must be done after all arguments have been processed.
3596 // java_compiler() true means set to "NONE" or empty.
3597 if (java_compiler() && !xdebug_mode()) {
3598 // For backwards compatibility, we switch to interpreted mode if
3599 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3600 // not specified.
3601 set_mode_flags(_int);
3602 }
3603
3604 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3605 // but like -Xint, leave compilation thresholds unaffected.
3606 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3607 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3608 set_mode_flags(_int);
3609 }
3610
3611 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3612 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3613 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3614 }
3615
3616 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3617 // Don't degrade server performance for footprint
3618 if (FLAG_IS_DEFAULT(UseLargePages) &&
3619 MaxHeapSize < LargePageHeapSizeThreshold) {
3620 // No need for large granularity pages w/small heaps.
3621 // Note that large pages are enabled/disabled for both the
3622 // Java heap and the code cache.
3623 FLAG_SET_DEFAULT(UseLargePages, false);
3624 }
3625
3626 #elif defined(COMPILER2)
3627 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3628 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3629 }
3630 #endif
3631
3632 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3633 UNSUPPORTED_OPTION(ProfileInterpreter);
3634 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3635 #endif
3636
3637 #ifndef TIERED
3638 // Tiered compilation is undefined.
3639 UNSUPPORTED_OPTION(TieredCompilation);
3640 #endif
3641
3642 #if INCLUDE_JVMCI
3643 if (EnableJVMCI &&
3644 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3645 return JNI_ENOMEM;
3646 }
3647 #endif
3648
3649 // If we are running in a headless jre, force java.awt.headless property
3650 // to be true unless the property has already been set.
3651 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3652 if (os::is_headless_jre()) {
3653 const char* headless = Arguments::get_property("java.awt.headless");
3654 if (headless == NULL) {
3655 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3656 if (headless_env == NULL) {
3657 if (!add_property("java.awt.headless=true")) {
3658 return JNI_ENOMEM;
3659 }
3660 } else {
3661 char buffer[256];
3662 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3663 if (!add_property(buffer)) {
3664 return JNI_ENOMEM;
3665 }
3666 }
3667 }
3668 }
3669
3670 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3671 // CMS can only be used with ParNew
3672 FLAG_SET_ERGO(bool, UseParNewGC, true);
3673 }
3674
3675 if (!check_vm_args_consistency()) {
3676 return JNI_ERR;
3677 }
3678
3679 return JNI_OK;
3680 }
3681
3682 // Helper class for controlling the lifetime of JavaVMInitArgs
3683 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3684 // deleted on the destruction of the ScopedVMInitArgs object.
3685 class ScopedVMInitArgs : public StackObj {
3686 private:
3687 JavaVMInitArgs _args;
3688 char* _container_name;
3689 bool _is_set;
3690 char* _vm_options_file_arg;
3691
3692 public:
3693 ScopedVMInitArgs(const char *container_name) {
3694 _args.version = JNI_VERSION_1_2;
3695 _args.nOptions = 0;
3696 _args.options = NULL;
3697 _args.ignoreUnrecognized = false;
3698 _container_name = (char *)container_name;
3699 _is_set = false;
3700 _vm_options_file_arg = NULL;
3701 }
3702
3703 // Populates the JavaVMInitArgs object represented by this
3704 // ScopedVMInitArgs object with the arguments in options. The
3705 // allocated memory is deleted by the destructor. If this method
3706 // returns anything other than JNI_OK, then this object is in a
3707 // partially constructed state, and should be abandoned.
3708 jint set_args(GrowableArray<JavaVMOption>* options) {
3709 _is_set = true;
3710 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3711 JavaVMOption, options->length(), mtArguments);
3712 if (options_arr == NULL) {
3713 return JNI_ENOMEM;
3714 }
3715 _args.options = options_arr;
3716
3717 for (int i = 0; i < options->length(); i++) {
3718 options_arr[i] = options->at(i);
3719 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3720 if (options_arr[i].optionString == NULL) {
3721 // Rely on the destructor to do cleanup.
3722 _args.nOptions = i;
3723 return JNI_ENOMEM;
3724 }
3725 }
3726
3727 _args.nOptions = options->length();
3728 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3729 return JNI_OK;
3730 }
3731
3732 JavaVMInitArgs* get() { return &_args; }
3733 char* container_name() { return _container_name; }
3734 bool is_set() { return _is_set; }
3735 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3736 char* vm_options_file_arg() { return _vm_options_file_arg; }
3737
3738 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3739 if (_vm_options_file_arg != NULL) {
3740 os::free(_vm_options_file_arg);
3741 }
3742 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3743 }
3744
3745 ~ScopedVMInitArgs() {
3746 if (_vm_options_file_arg != NULL) {
3747 os::free(_vm_options_file_arg);
3748 }
3749 if (_args.options == NULL) return;
3750 for (int i = 0; i < _args.nOptions; i++) {
3751 os::free(_args.options[i].optionString);
3752 }
3753 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3754 }
3755
3756 // Insert options into this option list, to replace option at
3757 // vm_options_file_pos (-XX:VMOptionsFile)
3758 jint insert(const JavaVMInitArgs* args,
3759 const JavaVMInitArgs* args_to_insert,
3760 const int vm_options_file_pos) {
3761 assert(_args.options == NULL, "shouldn't be set yet");
3762 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3763 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3764
3765 int length = args->nOptions + args_to_insert->nOptions - 1;
3766 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3767 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3768 for (int i = 0; i < args->nOptions; i++) {
3769 if (i == vm_options_file_pos) {
3770 // insert the new options starting at the same place as the
3771 // -XX:VMOptionsFile option
3772 for (int j = 0; j < args_to_insert->nOptions; j++) {
3773 options->push(args_to_insert->options[j]);
3774 }
3775 } else {
3776 options->push(args->options[i]);
3777 }
3778 }
3779 // make into options array
3780 jint result = set_args(options);
3781 delete options;
3782 return result;
3783 }
3784 };
3785
3786 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3787 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3788 }
3789
3790 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3791 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3792 }
3793
3794 jint Arguments::parse_options_environment_variable(const char* name,
3795 ScopedVMInitArgs* vm_args) {
3796 char *buffer = ::getenv(name);
3797
3798 // Don't check this environment variable if user has special privileges
3799 // (e.g. unix su command).
3800 if (buffer == NULL || os::have_special_privileges()) {
3801 return JNI_OK;
3802 }
3803
3804 if ((buffer = os::strdup(buffer)) == NULL) {
3805 return JNI_ENOMEM;
3806 }
3807
3808 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3809
3810 os::free(buffer);
3811 return retcode;
3812 }
3813
3814 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3815 // read file into buffer
3816 int fd = ::open(file_name, O_RDONLY);
3817 if (fd < 0) {
3818 jio_fprintf(defaultStream::error_stream(),
3819 "Could not open options file '%s'\n",
3820 file_name);
3821 return JNI_ERR;
3822 }
3823
3824 struct stat stbuf;
3825 int retcode = os::stat(file_name, &stbuf);
3826 if (retcode != 0) {
3827 jio_fprintf(defaultStream::error_stream(),
3828 "Could not stat options file '%s'\n",
3829 file_name);
3830 os::close(fd);
3831 return JNI_ERR;
3832 }
3833
3834 if (stbuf.st_size == 0) {
3835 // tell caller there is no option data and that is ok
3836 os::close(fd);
3837 return JNI_OK;
3838 }
3839
3840 // '+ 1' for NULL termination even with max bytes
3841 size_t bytes_alloc = stbuf.st_size + 1;
3842
3843 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3844 if (NULL == buf) {
3845 jio_fprintf(defaultStream::error_stream(),
3846 "Could not allocate read buffer for options file parse\n");
3847 os::close(fd);
3848 return JNI_ENOMEM;
3849 }
3850
3851 memset(buf, 0, bytes_alloc);
3852
3853 // Fill buffer
3854 // Use ::read() instead of os::read because os::read()
3855 // might do a thread state transition
3856 // and it is too early for that here
3857
3858 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3859 os::close(fd);
3860 if (bytes_read < 0) {
3861 FREE_C_HEAP_ARRAY(char, buf);
3862 jio_fprintf(defaultStream::error_stream(),
3863 "Could not read options file '%s'\n", file_name);
3864 return JNI_ERR;
3865 }
3866
3867 if (bytes_read == 0) {
3868 // tell caller there is no option data and that is ok
3869 FREE_C_HEAP_ARRAY(char, buf);
3870 return JNI_OK;
3871 }
3872
3873 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3874
3875 FREE_C_HEAP_ARRAY(char, buf);
3876 return retcode;
3877 }
3878
3879 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3880 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3881
3882 // some pointers to help with parsing
3883 char *buffer_end = buffer + buf_len;
3884 char *opt_hd = buffer;
3885 char *wrt = buffer;
3886 char *rd = buffer;
3887
3888 // parse all options
3889 while (rd < buffer_end) {
3890 // skip leading white space from the input string
3891 while (rd < buffer_end && isspace(*rd)) {
3892 rd++;
3893 }
3894
3895 if (rd >= buffer_end) {
3896 break;
3897 }
3898
3899 // Remember this is where we found the head of the token.
3900 opt_hd = wrt;
3901
3902 // Tokens are strings of non white space characters separated
3903 // by one or more white spaces.
3904 while (rd < buffer_end && !isspace(*rd)) {
3905 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3906 int quote = *rd; // matching quote to look for
3907 rd++; // don't copy open quote
3908 while (rd < buffer_end && *rd != quote) {
3909 // include everything (even spaces)
3910 // up until the close quote
3911 *wrt++ = *rd++; // copy to option string
3912 }
3913
3914 if (rd < buffer_end) {
3915 rd++; // don't copy close quote
3916 } else {
3917 // did not see closing quote
3918 jio_fprintf(defaultStream::error_stream(),
3919 "Unmatched quote in %s\n", name);
3920 delete options;
3921 return JNI_ERR;
3922 }
3923 } else {
3924 *wrt++ = *rd++; // copy to option string
3925 }
3926 }
3927
3928 // steal a white space character and set it to NULL
3929 *wrt++ = '\0';
3930 // We now have a complete token
3931
3932 JavaVMOption option;
3933 option.optionString = opt_hd;
3934 option.extraInfo = NULL;
3935
3936 options->append(option); // Fill in option
3937
3938 rd++; // Advance to next character
3939 }
3940
3941 // Fill out JavaVMInitArgs structure.
3942 jint status = vm_args->set_args(options);
3943
3944 delete options;
3945 return status;
3946 }
3947
3948 void Arguments::set_shared_spaces_flags() {
3949 if (DumpSharedSpaces) {
3950 if (FailOverToOldVerifier) {
3951 // Don't fall back to the old verifier on verification failure. If a
3952 // class fails verification with the split verifier, it might fail the
3953 // CDS runtime verifier constraint check. In that case, we don't want
3954 // to share the class. We only archive classes that pass the split verifier.
3955 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3956 }
3957
3958 if (RequireSharedSpaces) {
3959 warning("Cannot dump shared archive while using shared archive");
3960 }
3961 UseSharedSpaces = false;
3962 #ifdef _LP64
3963 if (!UseCompressedOops || !UseCompressedClassPointers) {
3964 vm_exit_during_initialization(
3965 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3966 }
3967 } else {
3968 if (!UseCompressedOops || !UseCompressedClassPointers) {
3969 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3970 }
3971 #endif
3972 }
3973 }
3974
3975 // Sharing support
3976 // Construct the path to the archive
3977 static char* get_shared_archive_path() {
3978 char *shared_archive_path;
3979 if (SharedArchiveFile == NULL) {
3980 char jvm_path[JVM_MAXPATHLEN];
3981 os::jvm_path(jvm_path, sizeof(jvm_path));
3982 char *end = strrchr(jvm_path, *os::file_separator());
3983 if (end != NULL) *end = '\0';
3984 size_t jvm_path_len = strlen(jvm_path);
3985 size_t file_sep_len = strlen(os::file_separator());
3986 const size_t len = jvm_path_len + file_sep_len + 20;
3987 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3988 if (shared_archive_path != NULL) {
3989 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3990 jvm_path, os::file_separator());
3991 }
3992 } else {
3993 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3994 }
3995 return shared_archive_path;
3996 }
3997
3998 #ifndef PRODUCT
3999 // Determine whether LogVMOutput should be implicitly turned on.
4000 static bool use_vm_log() {
4001 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4002 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4003 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4004 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4005 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4006 return true;
4007 }
4008
4009 #ifdef COMPILER1
4010 if (PrintC1Statistics) {
4011 return true;
4012 }
4013 #endif // COMPILER1
4014
4015 #ifdef COMPILER2
4016 if (PrintOptoAssembly || PrintOptoStatistics) {
4017 return true;
4018 }
4019 #endif // COMPILER2
4020
4021 return false;
4022 }
4023
4024 #endif // PRODUCT
4025
4026 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4027 for (int index = 0; index < args->nOptions; index++) {
4028 const JavaVMOption* option = args->options + index;
4029 const char* tail;
4030 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4031 return true;
4032 }
4033 }
4034 return false;
4035 }
4036
4037 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4038 const char* vm_options_file,
4039 const int vm_options_file_pos,
4040 ScopedVMInitArgs* vm_options_file_args,
4041 ScopedVMInitArgs* args_out) {
4042 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4043 if (code != JNI_OK) {
4044 return code;
4045 }
4046
4047 if (vm_options_file_args->get()->nOptions < 1) {
4048 return JNI_OK;
4049 }
4050
4051 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4052 jio_fprintf(defaultStream::error_stream(),
4053 "A VM options file may not refer to a VM options file. "
4054 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4055 "options file '%s' in options container '%s' is an error.\n",
4056 vm_options_file_args->vm_options_file_arg(),
4057 vm_options_file_args->container_name());
4058 return JNI_EINVAL;
4059 }
4060
4061 return args_out->insert(args, vm_options_file_args->get(),
4062 vm_options_file_pos);
4063 }
4064
4065 // Expand -XX:VMOptionsFile found in args_in as needed.
4066 // mod_args and args_out parameters may return values as needed.
4067 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4068 ScopedVMInitArgs* mod_args,
4069 JavaVMInitArgs** args_out) {
4070 jint code = match_special_option_and_act(args_in, mod_args);
4071 if (code != JNI_OK) {
4072 return code;
4073 }
4074
4075 if (mod_args->is_set()) {
4076 // args_in contains -XX:VMOptionsFile and mod_args contains the
4077 // original options from args_in along with the options expanded
4078 // from the VMOptionsFile. Return a short-hand to the caller.
4079 *args_out = mod_args->get();
4080 } else {
4081 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4082 }
4083 return JNI_OK;
4084 }
4085
4086 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4087 ScopedVMInitArgs* args_out) {
4088 // Remaining part of option string
4089 const char* tail;
4090 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4091
4092 for (int index = 0; index < args->nOptions; index++) {
4093 const JavaVMOption* option = args->options + index;
4094 if (ArgumentsExt::process_options(option)) {
4095 continue;
4096 }
4097 if (match_option(option, "-XX:Flags=", &tail)) {
4098 Arguments::set_jvm_flags_file(tail);
4099 continue;
4100 }
4101 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4102 if (vm_options_file_args.found_vm_options_file_arg()) {
4103 jio_fprintf(defaultStream::error_stream(),
4104 "The option '%s' is already specified in the options "
4105 "container '%s' so the specification of '%s' in the "
4106 "same options container is an error.\n",
4107 vm_options_file_args.vm_options_file_arg(),
4108 vm_options_file_args.container_name(),
4109 option->optionString);
4110 return JNI_EINVAL;
4111 }
4112 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4113 // If there's a VMOptionsFile, parse that
4114 jint code = insert_vm_options_file(args, tail, index,
4115 &vm_options_file_args, args_out);
4116 if (code != JNI_OK) {
4117 return code;
4118 }
4119 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4120 if (args_out->is_set()) {
4121 // The VMOptions file inserted some options so switch 'args'
4122 // to the new set of options, and continue processing which
4123 // preserves "last option wins" semantics.
4124 args = args_out->get();
4125 // The first option from the VMOptionsFile replaces the
4126 // current option. So we back track to process the
4127 // replacement option.
4128 index--;
4129 }
4130 continue;
4131 }
4132 if (match_option(option, "-XX:+PrintVMOptions")) {
4133 PrintVMOptions = true;
4134 continue;
4135 }
4136 if (match_option(option, "-XX:-PrintVMOptions")) {
4137 PrintVMOptions = false;
4138 continue;
4139 }
4140 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4141 IgnoreUnrecognizedVMOptions = true;
4142 continue;
4143 }
4144 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4145 IgnoreUnrecognizedVMOptions = false;
4146 continue;
4147 }
4148 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4149 CommandLineFlags::printFlags(tty, false);
4150 vm_exit(0);
4151 }
4152 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4153 #if INCLUDE_NMT
4154 // The launcher did not setup nmt environment variable properly.
4155 if (!MemTracker::check_launcher_nmt_support(tail)) {
4156 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4157 }
4158
4159 // Verify if nmt option is valid.
4160 if (MemTracker::verify_nmt_option()) {
4161 // Late initialization, still in single-threaded mode.
4162 if (MemTracker::tracking_level() >= NMT_summary) {
4163 MemTracker::init();
4164 }
4165 } else {
4166 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4167 }
4168 continue;
4169 #else
4170 jio_fprintf(defaultStream::error_stream(),
4171 "Native Memory Tracking is not supported in this VM\n");
4172 return JNI_ERR;
4173 #endif
4174 }
4175
4176 #ifndef PRODUCT
4177 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4178 CommandLineFlags::printFlags(tty, true);
4179 vm_exit(0);
4180 }
4181 #endif
4182 }
4183 return JNI_OK;
4184 }
4185
4186 static void print_options(const JavaVMInitArgs *args) {
4187 const char* tail;
4188 for (int index = 0; index < args->nOptions; index++) {
4189 const JavaVMOption *option = args->options + index;
4190 if (match_option(option, "-XX:", &tail)) {
4191 logOption(tail);
4192 }
4193 }
4194 }
4195
4196 bool Arguments::handle_deprecated_print_gc_flags() {
4197 if (PrintGC) {
4198 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4199 }
4200 if (PrintGCDetails) {
4201 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4202 }
4203
4204 if (_gc_log_filename != NULL) {
4205 // -Xloggc was used to specify a filename
4206 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4207
4208 LogTarget(Error, logging) target;
4209 LogStreamCHeap errstream(target);
4210 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4211 } else if (PrintGC || PrintGCDetails) {
4212 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4213 }
4214 return true;
4215 }
4216
4217 void Arguments::handle_extra_cms_flags(const char* msg) {
4218 SpecialFlag flag;
4219 const char *flag_name = "UseConcMarkSweepGC";
4220 if (lookup_special_flag(flag_name, flag)) {
4221 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4222 warning("%s", msg);
4223 }
4224 }
4225
4226 // Parse entry point called from JNI_CreateJavaVM
4227
4228 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4229 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4230
4231 // Initialize ranges, constraints and writeables
4232 CommandLineFlagRangeList::init();
4233 CommandLineFlagConstraintList::init();
4234 CommandLineFlagWriteableList::init();
4235
4236 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4237 const char* hotspotrc = ".hotspotrc";
4238 bool settings_file_specified = false;
4239 bool needs_hotspotrc_warning = false;
4240 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4241 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4242
4243 // Pointers to current working set of containers
4244 JavaVMInitArgs* cur_cmd_args;
4245 JavaVMInitArgs* cur_java_options_args;
4246 JavaVMInitArgs* cur_java_tool_options_args;
4247
4248 // Containers for modified/expanded options
4249 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4250 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4251 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4252
4253
4254 jint code =
4255 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4256 if (code != JNI_OK) {
4257 return code;
4258 }
4259
4260 code = parse_java_options_environment_variable(&initial_java_options_args);
4261 if (code != JNI_OK) {
4262 return code;
4263 }
4264
4265 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4266 &mod_java_tool_options_args,
4267 &cur_java_tool_options_args);
4268 if (code != JNI_OK) {
4269 return code;
4270 }
4271
4272 code = expand_vm_options_as_needed(initial_cmd_args,
4273 &mod_cmd_args,
4274 &cur_cmd_args);
4275 if (code != JNI_OK) {
4276 return code;
4277 }
4278
4279 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4280 &mod_java_options_args,
4281 &cur_java_options_args);
4282 if (code != JNI_OK) {
4283 return code;
4284 }
4285
4286 const char* flags_file = Arguments::get_jvm_flags_file();
4287 settings_file_specified = (flags_file != NULL);
4288
4289 if (IgnoreUnrecognizedVMOptions) {
4290 cur_cmd_args->ignoreUnrecognized = true;
4291 cur_java_tool_options_args->ignoreUnrecognized = true;
4292 cur_java_options_args->ignoreUnrecognized = true;
4293 }
4294
4295 // Parse specified settings file
4296 if (settings_file_specified) {
4297 if (!process_settings_file(flags_file, true,
4298 cur_cmd_args->ignoreUnrecognized)) {
4299 return JNI_EINVAL;
4300 }
4301 } else {
4302 #ifdef ASSERT
4303 // Parse default .hotspotrc settings file
4304 if (!process_settings_file(".hotspotrc", false,
4305 cur_cmd_args->ignoreUnrecognized)) {
4306 return JNI_EINVAL;
4307 }
4308 #else
4309 struct stat buf;
4310 if (os::stat(hotspotrc, &buf) == 0) {
4311 needs_hotspotrc_warning = true;
4312 }
4313 #endif
4314 }
4315
4316 if (PrintVMOptions) {
4317 print_options(cur_java_tool_options_args);
4318 print_options(cur_cmd_args);
4319 print_options(cur_java_options_args);
4320 }
4321
4322 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4323 jint result = parse_vm_init_args(cur_java_tool_options_args,
4324 cur_java_options_args,
4325 cur_cmd_args);
4326
4327 if (result != JNI_OK) {
4328 return result;
4329 }
4330
4331 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4332 SharedArchivePath = get_shared_archive_path();
4333 if (SharedArchivePath == NULL) {
4334 return JNI_ENOMEM;
4335 }
4336
4337 // Set up VerifySharedSpaces
4338 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4339 VerifySharedSpaces = true;
4340 }
4341
4342 // Delay warning until here so that we've had a chance to process
4343 // the -XX:-PrintWarnings flag
4344 if (needs_hotspotrc_warning) {
4345 warning("%s file is present but has been ignored. "
4346 "Run with -XX:Flags=%s to load the file.",
4347 hotspotrc, hotspotrc);
4348 }
4349
4350 if (needs_module_property_warning) {
4351 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4352 " names that are reserved for internal use.");
4353 }
4354
4355 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4356 UNSUPPORTED_OPTION(UseLargePages);
4357 #endif
4358
4359 ArgumentsExt::report_unsupported_options();
4360
4361 #ifndef PRODUCT
4362 if (TraceBytecodesAt != 0) {
4363 TraceBytecodes = true;
4364 }
4365 if (CountCompiledCalls) {
4366 if (UseCounterDecay) {
4367 warning("UseCounterDecay disabled because CountCalls is set");
4368 UseCounterDecay = false;
4369 }
4370 }
4371 #endif // PRODUCT
4372
4373 if (ScavengeRootsInCode == 0) {
4374 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4375 warning("Forcing ScavengeRootsInCode non-zero");
4376 }
4377 ScavengeRootsInCode = 1;
4378 }
4379
4380 if (!handle_deprecated_print_gc_flags()) {
4381 return JNI_EINVAL;
4382 }
4383
4384 // Set object alignment values.
4385 set_object_alignment();
4386
4387 #if !INCLUDE_CDS
4388 if (DumpSharedSpaces || RequireSharedSpaces) {
4389 jio_fprintf(defaultStream::error_stream(),
4390 "Shared spaces are not supported in this VM\n");
4391 return JNI_ERR;
4392 }
4393 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4394 warning("Shared spaces are not supported in this VM");
4395 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4396 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4397 }
4398 no_shared_spaces("CDS Disabled");
4399 #endif // INCLUDE_CDS
4400
4401 return JNI_OK;
4402 }
4403
4404 jint Arguments::apply_ergo() {
4405
4406 // Set flags based on ergonomics.
4407 set_ergonomics_flags();
4408
4409 set_shared_spaces_flags();
4410
4411 // Check the GC selections again.
4412 if (!check_gc_consistency()) {
4413 return JNI_EINVAL;
4414 }
4415
4416 if (TieredCompilation) {
4417 set_tiered_flags();
4418 } else {
4419 int max_compilation_policy_choice = 1;
4420 #ifdef COMPILER2
4421 max_compilation_policy_choice = 2;
4422 #endif
4423 // Check if the policy is valid.
4424 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4425 vm_exit_during_initialization(
4426 "Incompatible compilation policy selected", NULL);
4427 }
4428 // Scale CompileThreshold
4429 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4430 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4431 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4432 }
4433 }
4434
4435 #ifdef COMPILER2
4436 #ifndef PRODUCT
4437 if (PrintIdealGraphLevel > 0) {
4438 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4439 }
4440 #endif
4441 #endif
4442
4443 // Set heap size based on available physical memory
4444 set_heap_size();
4445
4446 ArgumentsExt::set_gc_specific_flags();
4447
4448 // Initialize Metaspace flags and alignments
4449 Metaspace::ergo_initialize();
4450
4451 // Set bytecode rewriting flags
4452 set_bytecode_flags();
4453
4454 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4455 jint code = set_aggressive_opts_flags();
4456 if (code != JNI_OK) {
4457 return code;
4458 }
4459
4460 // Turn off biased locking for locking debug mode flags,
4461 // which are subtly different from each other but neither works with
4462 // biased locking
4463 if (UseHeavyMonitors
4464 #ifdef COMPILER1
4465 || !UseFastLocking
4466 #endif // COMPILER1
4467 #if INCLUDE_JVMCI
4468 || !JVMCIUseFastLocking
4469 #endif
4470 ) {
4471 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4472 // flag set to true on command line; warn the user that they
4473 // can't enable biased locking here
4474 warning("Biased Locking is not supported with locking debug flags"
4475 "; ignoring UseBiasedLocking flag." );
4476 }
4477 UseBiasedLocking = false;
4478 }
4479
4480 #ifdef CC_INTERP
4481 // Clear flags not supported on zero.
4482 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4483 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4484 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4485 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4486 #endif // CC_INTERP
4487
4488 #ifdef COMPILER2
4489 if (!EliminateLocks) {
4490 EliminateNestedLocks = false;
4491 }
4492 if (!Inline) {
4493 IncrementalInline = false;
4494 }
4495 #ifndef PRODUCT
4496 if (!IncrementalInline) {
4497 AlwaysIncrementalInline = false;
4498 }
4499 #endif
4500 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4501 // nothing to use the profiling, turn if off
4502 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4503 }
4504 #endif
4505
4506 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4507 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4508 DebugNonSafepoints = true;
4509 }
4510
4511 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4512 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4513 }
4514
4515 if (UseOnStackReplacement && !UseLoopCounter) {
4516 warning("On-stack-replacement requires loop counters; enabling loop counters");
4517 FLAG_SET_DEFAULT(UseLoopCounter, true);
4518 }
4519
4520 #ifndef PRODUCT
4521 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4522 if (use_vm_log()) {
4523 LogVMOutput = true;
4524 }
4525 }
4526 #endif // PRODUCT
4527
4528 if (PrintCommandLineFlags) {
4529 CommandLineFlags::printSetFlags(tty);
4530 }
4531
4532 // Apply CPU specific policy for the BiasedLocking
4533 if (UseBiasedLocking) {
4534 if (!VM_Version::use_biased_locking() &&
4535 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4536 UseBiasedLocking = false;
4537 }
4538 }
4539 #ifdef COMPILER2
4540 if (!UseBiasedLocking || EmitSync != 0) {
4541 UseOptoBiasInlining = false;
4542 }
4543 #endif
4544
4545 return JNI_OK;
4546 }
4547
4548 jint Arguments::adjust_after_os() {
4549 if (UseNUMA) {
4550 if (UseParallelGC || UseParallelOldGC) {
4551 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4552 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4553 }
4554 }
4555 // UseNUMAInterleaving is set to ON for all collectors and
4556 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4557 // such as the parallel collector for Linux and Solaris will
4558 // interleave old gen and survivor spaces on top of NUMA
4559 // allocation policy for the eden space.
4560 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4561 // all platforms and ParallelGC on Windows will interleave all
4562 // of the heap spaces across NUMA nodes.
4563 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4564 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4565 }
4566 }
4567 return JNI_OK;
4568 }
4569
4570 int Arguments::PropertyList_count(SystemProperty* pl) {
4571 int count = 0;
4572 while(pl != NULL) {
4573 count++;
4574 pl = pl->next();
4575 }
4576 return count;
4577 }
4578
4579 // Return the number of readable properties.
4580 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4581 int count = 0;
4582 while(pl != NULL) {
4583 if (pl->is_readable()) {
4584 count++;
4585 }
4586 pl = pl->next();
4587 }
4588 return count;
4589 }
4590
4591 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4592 assert(key != NULL, "just checking");
4593 SystemProperty* prop;
4594 for (prop = pl; prop != NULL; prop = prop->next()) {
4595 if (strcmp(key, prop->key()) == 0) return prop->value();
4596 }
4597 return NULL;
4598 }
4599
4600 // Return the value of the requested property provided that it is a readable property.
4601 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4602 assert(key != NULL, "just checking");
4603 SystemProperty* prop;
4604 // Return the property value if the keys match and the property is not internal or
4605 // it's the special internal property "jdk.boot.class.path.append".
4606 for (prop = pl; prop != NULL; prop = prop->next()) {
4607 if (strcmp(key, prop->key()) == 0) {
4608 if (!prop->internal()) {
4609 return prop->value();
4610 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4611 return prop->value();
4612 } else {
4613 // Property is internal and not jdk.boot.class.path.append so return NULL.
4614 return NULL;
4615 }
4616 }
4617 }
4618 return NULL;
4619 }
4620
4621 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4622 int count = 0;
4623 const char* ret_val = NULL;
4624
4625 while(pl != NULL) {
4626 if(count >= index) {
4627 ret_val = pl->key();
4628 break;
4629 }
4630 count++;
4631 pl = pl->next();
4632 }
4633
4634 return ret_val;
4635 }
4636
4637 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4638 int count = 0;
4639 char* ret_val = NULL;
4640
4641 while(pl != NULL) {
4642 if(count >= index) {
4643 ret_val = pl->value();
4644 break;
4645 }
4646 count++;
4647 pl = pl->next();
4648 }
4649
4650 return ret_val;
4651 }
4652
4653 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4654 SystemProperty* p = *plist;
4655 if (p == NULL) {
4656 *plist = new_p;
4657 } else {
4658 while (p->next() != NULL) {
4659 p = p->next();
4660 }
4661 p->set_next(new_p);
4662 }
4663 }
4664
4665 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4666 bool writeable, bool internal) {
4667 if (plist == NULL)
4668 return;
4669
4670 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4671 PropertyList_add(plist, new_p);
4672 }
4673
4674 void Arguments::PropertyList_add(SystemProperty *element) {
4675 PropertyList_add(&_system_properties, element);
4676 }
4677
4678 // This add maintains unique property key in the list.
4679 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4680 PropertyAppendable append, PropertyWriteable writeable,
4681 PropertyInternal internal) {
4682 if (plist == NULL)
4683 return;
4684
4685 // If property key exist then update with new value.
4686 SystemProperty* prop;
4687 for (prop = *plist; prop != NULL; prop = prop->next()) {
4688 if (strcmp(k, prop->key()) == 0) {
4689 if (append == AppendProperty) {
4690 prop->append_value(v);
4691 } else {
4692 prop->set_value(v);
4693 }
4694 return;
4695 }
4696 }
4697
4698 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4699 }
4700
4701 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4702 // Returns true if all of the source pointed by src has been copied over to
4703 // the destination buffer pointed by buf. Otherwise, returns false.
4704 // Notes:
4705 // 1. If the length (buflen) of the destination buffer excluding the
4706 // NULL terminator character is not long enough for holding the expanded
4707 // pid characters, it also returns false instead of returning the partially
4708 // expanded one.
4709 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4710 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4711 char* buf, size_t buflen) {
4712 const char* p = src;
4713 char* b = buf;
4714 const char* src_end = &src[srclen];
4715 char* buf_end = &buf[buflen - 1];
4716
4717 while (p < src_end && b < buf_end) {
4718 if (*p == '%') {
4719 switch (*(++p)) {
4720 case '%': // "%%" ==> "%"
4721 *b++ = *p++;
4722 break;
4723 case 'p': { // "%p" ==> current process id
4724 // buf_end points to the character before the last character so
4725 // that we could write '\0' to the end of the buffer.
4726 size_t buf_sz = buf_end - b + 1;
4727 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4728
4729 // if jio_snprintf fails or the buffer is not long enough to hold
4730 // the expanded pid, returns false.
4731 if (ret < 0 || ret >= (int)buf_sz) {
4732 return false;
4733 } else {
4734 b += ret;
4735 assert(*b == '\0', "fail in copy_expand_pid");
4736 if (p == src_end && b == buf_end + 1) {
4737 // reach the end of the buffer.
4738 return true;
4739 }
4740 }
4741 p++;
4742 break;
4743 }
4744 default :
4745 *b++ = '%';
4746 }
4747 } else {
4748 *b++ = *p++;
4749 }
4750 }
4751 *b = '\0';
4752 return (p == src_end); // return false if not all of the source was copied
4753 }