1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciRuntime.hpp"
60 #endif
61 #if INCLUDE_ALL_GCS
62 #include "gc/cms/compactibleFreeListSpace.hpp"
63 #include "gc/g1/g1CollectedHeap.inline.hpp"
64 #include "gc/parallel/parallelScavengeHeap.hpp"
65 #endif // INCLUDE_ALL_GCS
66
67 // Note: This is a special bug reporting site for the JVM
68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
116 bool Arguments::_has_jimage = false;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 bool needs_module_property_warning = false;
166
167 #define MODULE_PROPERTY_PREFIX "jdk.module."
168 #define MODULE_PROPERTY_PREFIX_LEN 11
169 #define ADDEXPORTS "addexports"
170 #define ADDEXPORTS_LEN 10
171 #define ADDREADS "addreads"
172 #define ADDREADS_LEN 8
173 #define PATCH "patch"
174 #define PATCH_LEN 5
175 #define ADDMODS "addmods"
176 #define ADDMODS_LEN 7
177 #define LIMITMODS "limitmods"
178 #define LIMITMODS_LEN 9
179 #define PATH "path"
180 #define PATH_LEN 4
181 #define UPGRADE_PATH "upgrade.path"
182 #define UPGRADE_PATH_LEN 12
183
184 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
185 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
186 return ((strncmp(option, property, len) == 0) &&
187 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
188 }
189
190 // Return true if property starts with "jdk.module." and its ensuing chars match
191 // any of the reserved module properties.
192 // property should be passed without the leading "-D".
193 bool Arguments::is_internal_module_property(const char* property) {
194 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
195 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
196 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
197 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
198 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
199 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
200 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
201 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
202 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
203 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
204 return true;
205 }
206 }
207 return false;
208 }
209
210 // Process java launcher properties.
211 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
212 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
213 // sun.java.launcher.pid is defined.
214 // Must do this before setting up other system properties,
215 // as some of them may depend on launcher type.
216 for (int index = 0; index < args->nOptions; index++) {
217 const JavaVMOption* option = args->options + index;
218 const char* tail;
219
220 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
221 process_java_launcher_argument(tail, option->extraInfo);
222 continue;
223 }
224 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
225 if (strcmp(tail, "true") == 0) {
226 _sun_java_launcher_is_altjvm = true;
227 }
228 continue;
229 }
230 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
231 _sun_java_launcher_pid = atoi(tail);
232 continue;
233 }
234 }
235 }
236
237 // Initialize system properties key and value.
238 void Arguments::init_system_properties() {
239
240 // Set up _system_boot_class_path which is not a property but
241 // relies heavily on argument processing and the jdk.boot.class.path.append
242 // property. It is used to store the underlying system boot class path.
243 _system_boot_class_path = new PathString(NULL);
244
245 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
246 "Java Virtual Machine Specification", false));
247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
250 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
251
252 // Following are JVMTI agent writable properties.
253 // Properties values are set to NULL and they are
254 // os specific they are initialized in os::init_system_properties_values().
255 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
256 _java_library_path = new SystemProperty("java.library.path", NULL, true);
257 _java_home = new SystemProperty("java.home", NULL, true);
258 _java_class_path = new SystemProperty("java.class.path", "", true);
259 // jdk.boot.class.path.append is a non-writeable, internal property.
260 // It can only be set by either:
261 // - -Xbootclasspath/a:
262 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
263 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
264
265 // Add to System Property list.
266 PropertyList_add(&_system_properties, _sun_boot_library_path);
267 PropertyList_add(&_system_properties, _java_library_path);
268 PropertyList_add(&_system_properties, _java_home);
269 PropertyList_add(&_system_properties, _java_class_path);
270 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
271
272 // Set OS specific system properties values
273 os::init_system_properties_values();
274 }
275
276 // Update/Initialize System properties after JDK version number is known
277 void Arguments::init_version_specific_system_properties() {
278 enum { bufsz = 16 };
279 char buffer[bufsz];
280 const char* spec_vendor = "Oracle Corporation";
281 uint32_t spec_version = JDK_Version::current().major_version();
282
283 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
284
285 PropertyList_add(&_system_properties,
286 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
287 PropertyList_add(&_system_properties,
288 new SystemProperty("java.vm.specification.version", buffer, false));
289 PropertyList_add(&_system_properties,
290 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
291 }
292
293 /*
294 * -XX argument processing:
295 *
296 * -XX arguments are defined in several places, such as:
297 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
298 * -XX arguments are parsed in parse_argument().
299 * -XX argument bounds checking is done in check_vm_args_consistency().
300 *
301 * Over time -XX arguments may change. There are mechanisms to handle common cases:
302 *
303 * ALIASED: An option that is simply another name for another option. This is often
304 * part of the process of deprecating a flag, but not all aliases need
305 * to be deprecated.
306 *
307 * Create an alias for an option by adding the old and new option names to the
308 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
309 *
310 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
311 * support may be removed in the future. Both regular and aliased options may be
312 * deprecated.
313 *
314 * Add a deprecation warning for an option (or alias) by adding an entry in the
315 * "special_jvm_flags" table and setting the "deprecated_in" field.
316 * Often an option "deprecated" in one major release will
317 * be made "obsolete" in the next. In this case the entry should also have it's
318 * "obsolete_in" field set.
319 *
320 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
321 * on the command line. A warning is printed to let the user know that option might not
322 * be accepted in the future.
323 *
324 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
325 * table and setting the "obsolete_in" field.
326 *
327 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
328 * to the current JDK version. The system will flatly refuse to admit the existence of
329 * the flag. This allows a flag to die automatically over JDK releases.
330 *
331 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
332 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
333 * - Newly obsolete or expired deprecated options should have their global variable
334 * definitions removed (from globals.hpp, etc) and related implementations removed.
335 *
336 * Recommended approach for removing options:
337 *
338 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
339 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
340 *
341 * To remove internal options (e.g. diagnostic, experimental, develop options), use
342 * a 2-step model adding major release numbers to the obsolete and expire columns.
343 *
344 * To change the name of an option, use the alias table as well as a 2-step
345 * model adding major release numbers to the deprecate and expire columns.
346 * Think twice about aliasing commonly used customer options.
347 *
348 * There are times when it is appropriate to leave a future release number as undefined.
349 *
350 * Tests: Aliases should be tested in VMAliasOptions.java.
351 * Deprecated options should be tested in VMDeprecatedOptions.java.
352 */
353
354 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
355 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
356 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
357 // the command-line as usual, but will issue a warning.
358 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
359 // the command-line, while issuing a warning and ignoring the flag value.
360 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
361 // existence of the flag.
362 //
363 // MANUAL CLEANUP ON JDK VERSION UPDATES:
364 // This table ensures that the handling of options will update automatically when the JDK
365 // version is incremented, but the source code needs to be cleanup up manually:
366 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
367 // variable should be removed, as well as users of the variable.
368 // - As "deprecated" options age into "obsolete" options, move the entry into the
369 // "Obsolete Flags" section of the table.
370 // - All expired options should be removed from the table.
371 static SpecialFlag const special_jvm_flags[] = {
372 // -------------- Deprecated Flags --------------
373 // --- Non-alias flags - sorted by obsolete_in then expired_in:
374 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
375 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
376 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
377 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
378 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
379 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
380 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
381
382 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
383 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
385 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
386 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
387 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
388 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
389 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390
391 // -------------- Obsolete Flags - sorted by expired_in --------------
392 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
393 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
394 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
395 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 #ifndef ZERO
406 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 #endif // ZERO
409 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
410 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
421 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
422
423 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
424 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
425 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
426 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
427 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
428 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
429 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
430 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
431 #endif
432
433 { NULL, JDK_Version(0), JDK_Version(0) }
434 };
435
436 // Flags that are aliases for other flags.
437 typedef struct {
438 const char* alias_name;
439 const char* real_name;
440 } AliasedFlag;
441
442 static AliasedFlag const aliased_jvm_flags[] = {
443 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
444 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
445 { "CMSMarkStackSize", "MarkStackSize" },
446 { "G1MarkStackSize", "MarkStackSize" },
447 { "ParallelMarkingThreads", "ConcGCThreads" },
448 { "ParallelCMSThreads", "ConcGCThreads" },
449 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
450 { NULL, NULL}
451 };
452
453 // NOTE: A compatibility request will be necessary for each alias to be removed.
454 static AliasedLoggingFlag const aliased_logging_flags[] = {
455 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
456 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
457 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
458 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
459 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
460 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
461 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
462 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
463 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
464 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
465 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
466 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
467 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
468 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
469 };
470
471 #ifndef PRODUCT
472 // These options are removed in jdk9. Remove this code for jdk10.
473 static AliasedFlag const removed_develop_logging_flags[] = {
474 { "TraceClassInitialization", "-Xlog:class+init" },
475 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
476 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
477 { "TraceItables", "-Xlog:itables=debug" },
478 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
479 { "TraceSafepoint", "-Xlog:safepoint=debug" },
480 { "TraceStartupTime", "-Xlog:startuptime" },
481 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
482 { "PrintVtables", "-Xlog:vtables=debug" },
483 { "VerboseVerification", "-Xlog:verification" },
484 { NULL, NULL }
485 };
486 #endif //PRODUCT
487
488 // Return true if "v" is less than "other", where "other" may be "undefined".
489 static bool version_less_than(JDK_Version v, JDK_Version other) {
490 assert(!v.is_undefined(), "must be defined");
491 if (!other.is_undefined() && v.compare(other) >= 0) {
492 return false;
493 } else {
494 return true;
495 }
496 }
497
498 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
499
500 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
501 // Allow extensions to have priority
502 if (lookup_special_flag_ext(flag_name, flag)) {
503 return true;
504 }
505
506 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
507 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
508 flag = special_jvm_flags[i];
509 return true;
510 }
511 }
512 return false;
513 }
514
515 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
516 assert(version != NULL, "Must provide a version buffer");
517 SpecialFlag flag;
518 if (lookup_special_flag(flag_name, flag)) {
519 if (!flag.obsolete_in.is_undefined()) {
520 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
521 *version = flag.obsolete_in;
522 return true;
523 }
524 }
525 }
526 return false;
527 }
528
529 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
530 assert(version != NULL, "Must provide a version buffer");
531 SpecialFlag flag;
532 if (lookup_special_flag(flag_name, flag)) {
533 if (!flag.deprecated_in.is_undefined()) {
534 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
535 version_less_than(JDK_Version::current(), flag.expired_in)) {
536 *version = flag.deprecated_in;
537 return 1;
538 } else {
539 return -1;
540 }
541 }
542 }
543 return 0;
544 }
545
546 #ifndef PRODUCT
547 const char* Arguments::removed_develop_logging_flag_name(const char* name){
548 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
549 const AliasedFlag& flag = removed_develop_logging_flags[i];
550 if (strcmp(flag.alias_name, name) == 0) {
551 return flag.real_name;
552 }
553 }
554 return NULL;
555 }
556 #endif // PRODUCT
557
558 const char* Arguments::real_flag_name(const char *flag_name) {
559 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
560 const AliasedFlag& flag_status = aliased_jvm_flags[i];
561 if (strcmp(flag_status.alias_name, flag_name) == 0) {
562 return flag_status.real_name;
563 }
564 }
565 return flag_name;
566 }
567
568 #ifdef ASSERT
569 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
570 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
571 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
572 return true;
573 }
574 }
575 return false;
576 }
577
578 static bool verify_special_jvm_flags() {
579 bool success = true;
580 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
581 const SpecialFlag& flag = special_jvm_flags[i];
582 if (lookup_special_flag(flag.name, i)) {
583 warning("Duplicate special flag declaration \"%s\"", flag.name);
584 success = false;
585 }
586 if (flag.deprecated_in.is_undefined() &&
587 flag.obsolete_in.is_undefined()) {
588 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
589 success = false;
590 }
591
592 if (!flag.deprecated_in.is_undefined()) {
593 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
594 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
595 success = false;
596 }
597
598 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
599 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
600 success = false;
601 }
602 }
603
604 if (!flag.obsolete_in.is_undefined()) {
605 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
606 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
607 success = false;
608 }
609
610 // if flag has become obsolete it should not have a "globals" flag defined anymore.
611 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
612 if (Flag::find_flag(flag.name) != NULL) {
613 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
614 success = false;
615 }
616 }
617 }
618
619 if (!flag.expired_in.is_undefined()) {
620 // if flag has become expired it should not have a "globals" flag defined anymore.
621 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
622 if (Flag::find_flag(flag.name) != NULL) {
623 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
624 success = false;
625 }
626 }
627 }
628
629 }
630 return success;
631 }
632 #endif
633
634 // Parses a size specification string.
635 bool Arguments::atojulong(const char *s, julong* result) {
636 julong n = 0;
637
638 // First char must be a digit. Don't allow negative numbers or leading spaces.
639 if (!isdigit(*s)) {
640 return false;
641 }
642
643 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
644 char* remainder;
645 errno = 0;
646 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
647 if (errno != 0) {
648 return false;
649 }
650
651 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
652 if (remainder == s || strlen(remainder) > 1) {
653 return false;
654 }
655
656 switch (*remainder) {
657 case 'T': case 't':
658 *result = n * G * K;
659 // Check for overflow.
660 if (*result/((julong)G * K) != n) return false;
661 return true;
662 case 'G': case 'g':
663 *result = n * G;
664 if (*result/G != n) return false;
665 return true;
666 case 'M': case 'm':
667 *result = n * M;
668 if (*result/M != n) return false;
669 return true;
670 case 'K': case 'k':
671 *result = n * K;
672 if (*result/K != n) return false;
673 return true;
674 case '\0':
675 *result = n;
676 return true;
677 default:
678 return false;
679 }
680 }
681
682 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
683 if (size < min_size) return arg_too_small;
684 // Check that size will fit in a size_t (only relevant on 32-bit)
685 if (size > max_uintx) return arg_too_big;
686 return arg_in_range;
687 }
688
689 // Describe an argument out of range error
690 void Arguments::describe_range_error(ArgsRange errcode) {
691 switch(errcode) {
692 case arg_too_big:
693 jio_fprintf(defaultStream::error_stream(),
694 "The specified size exceeds the maximum "
695 "representable size.\n");
696 break;
697 case arg_too_small:
698 case arg_unreadable:
699 case arg_in_range:
700 // do nothing for now
701 break;
702 default:
703 ShouldNotReachHere();
704 }
705 }
706
707 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
708 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
709 return true;
710 } else {
711 return false;
712 }
713 }
714
715 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
716 char* end;
717 errno = 0;
718 double v = strtod(value, &end);
719 if ((errno != 0) || (*end != 0)) {
720 return false;
721 }
722
723 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
724 return true;
725 }
726 return false;
727 }
728
729 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
730 julong v;
731 int int_v;
732 intx intx_v;
733 bool is_neg = false;
734 Flag* result = Flag::find_flag(name, strlen(name));
735
736 if (result == NULL) {
737 return false;
738 }
739
740 // Check the sign first since atojulong() parses only unsigned values.
741 if (*value == '-') {
742 if (!result->is_intx() && !result->is_int()) {
743 return false;
744 }
745 value++;
746 is_neg = true;
747 }
748 if (!Arguments::atojulong(value, &v)) {
749 return false;
750 }
751 if (result->is_int()) {
752 int_v = (int) v;
753 if (is_neg) {
754 int_v = -int_v;
755 }
756 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
757 } else if (result->is_uint()) {
758 uint uint_v = (uint) v;
759 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
760 } else if (result->is_intx()) {
761 intx_v = (intx) v;
762 if (is_neg) {
763 intx_v = -intx_v;
764 }
765 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
766 } else if (result->is_uintx()) {
767 uintx uintx_v = (uintx) v;
768 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
769 } else if (result->is_uint64_t()) {
770 uint64_t uint64_t_v = (uint64_t) v;
771 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
772 } else if (result->is_size_t()) {
773 size_t size_t_v = (size_t) v;
774 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
775 } else {
776 return false;
777 }
778 }
779
780 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
781 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
782 // Contract: CommandLineFlags always returns a pointer that needs freeing.
783 FREE_C_HEAP_ARRAY(char, value);
784 return true;
785 }
786
787 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
788 const char* old_value = "";
789 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
790 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
791 size_t new_len = strlen(new_value);
792 const char* value;
793 char* free_this_too = NULL;
794 if (old_len == 0) {
795 value = new_value;
796 } else if (new_len == 0) {
797 value = old_value;
798 } else {
799 size_t length = old_len + 1 + new_len + 1;
800 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
801 // each new setting adds another LINE to the switch:
802 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
803 value = buf;
804 free_this_too = buf;
805 }
806 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
807 // CommandLineFlags always returns a pointer that needs freeing.
808 FREE_C_HEAP_ARRAY(char, value);
809 if (free_this_too != NULL) {
810 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
811 FREE_C_HEAP_ARRAY(char, free_this_too);
812 }
813 return true;
814 }
815
816 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
817 const char* real_name = real_flag_name(arg);
818 JDK_Version since = JDK_Version();
819 switch (is_deprecated_flag(arg, &since)) {
820 case -1:
821 return NULL; // obsolete or expired, don't process normally
822 case 0:
823 return real_name;
824 case 1: {
825 if (warn) {
826 char version[256];
827 since.to_string(version, sizeof(version));
828 if (real_name != arg) {
829 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
830 arg, version, real_name);
831 } else {
832 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
833 arg, version);
834 }
835 }
836 return real_name;
837 }
838 }
839 ShouldNotReachHere();
840 return NULL;
841 }
842
843 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
844 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
845 // Set tagset string buffer at max size of 256, large enough for any alias tagset
846 const int max_tagset_size = 256;
847 int max_tagset_len = max_tagset_size - 1;
848 char tagset_buffer[max_tagset_size];
849 tagset_buffer[0] = '\0';
850
851 // Write tag-set for aliased logging option, in string list form
852 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
853 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
854 if (i > 0) {
855 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
856 }
857 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
858 }
859 if (!alf.exactMatch) {
860 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
861 }
862 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
863 (on) ? "+" : "-",
864 name,
865 tagset_buffer,
866 (on) ? LogLevel::name(alf.level) : "off");
867 }
868
869 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
870 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
871 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
872 if (strcmp(alf.alias_name, name) == 0) {
873 log_deprecated_flag(name, on, alf);
874 return alf;
875 }
876 }
877 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
878 return a;
879 }
880
881 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
882
883 // range of acceptable characters spelled out for portability reasons
884 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
885 #define BUFLEN 255
886 char name[BUFLEN+1];
887 char dummy;
888 const char* real_name;
889 bool warn_if_deprecated = true;
890
891 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
892 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
893 if (alf.alias_name != NULL){
894 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
895 return true;
896 }
897 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
898 if (real_name == NULL) {
899 return false;
900 }
901 return set_bool_flag(real_name, false, origin);
902 }
903 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
904 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
905 if (alf.alias_name != NULL){
906 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
907 return true;
908 }
909 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
910 if (real_name == NULL) {
911 return false;
912 }
913 return set_bool_flag(real_name, true, origin);
914 }
915
916 char punct;
917 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
918 const char* value = strchr(arg, '=') + 1;
919 Flag* flag;
920
921 // this scanf pattern matches both strings (handled here) and numbers (handled later))
922 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
923 if (alf.alias_name != NULL) {
924 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
925 return true;
926 }
927 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
928 if (real_name == NULL) {
929 return false;
930 }
931 flag = Flag::find_flag(real_name);
932 if (flag != NULL && flag->is_ccstr()) {
933 if (flag->ccstr_accumulates()) {
934 return append_to_string_flag(real_name, value, origin);
935 } else {
936 if (value[0] == '\0') {
937 value = NULL;
938 }
939 return set_string_flag(real_name, value, origin);
940 }
941 } else {
942 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
943 }
944 }
945
946 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
947 const char* value = strchr(arg, '=') + 1;
948 // -XX:Foo:=xxx will reset the string flag to the given value.
949 if (value[0] == '\0') {
950 value = NULL;
951 }
952 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
953 if (real_name == NULL) {
954 return false;
955 }
956 return set_string_flag(real_name, value, origin);
957 }
958
959 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
960 #define SIGNED_NUMBER_RANGE "[-0123456789]"
961 #define NUMBER_RANGE "[0123456789eE+-]"
962 char value[BUFLEN + 1];
963 char value2[BUFLEN + 1];
964 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
965 // Looks like a floating-point number -- try again with more lenient format string
966 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
967 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
968 if (real_name == NULL) {
969 return false;
970 }
971 return set_fp_numeric_flag(real_name, value, origin);
972 }
973 }
974
975 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
976 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
977 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
978 if (real_name == NULL) {
979 return false;
980 }
981 return set_numeric_flag(real_name, value, origin);
982 }
983
984 return false;
985 }
986
987 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
988 assert(bldarray != NULL, "illegal argument");
989
990 if (arg == NULL) {
991 return;
992 }
993
994 int new_count = *count + 1;
995
996 // expand the array and add arg to the last element
997 if (*bldarray == NULL) {
998 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
999 } else {
1000 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1001 }
1002 (*bldarray)[*count] = os::strdup_check_oom(arg);
1003 *count = new_count;
1004 }
1005
1006 void Arguments::build_jvm_args(const char* arg) {
1007 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1008 }
1009
1010 void Arguments::build_jvm_flags(const char* arg) {
1011 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1012 }
1013
1014 // utility function to return a string that concatenates all
1015 // strings in a given char** array
1016 const char* Arguments::build_resource_string(char** args, int count) {
1017 if (args == NULL || count == 0) {
1018 return NULL;
1019 }
1020 size_t length = 0;
1021 for (int i = 0; i < count; i++) {
1022 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1023 }
1024 char* s = NEW_RESOURCE_ARRAY(char, length);
1025 char* dst = s;
1026 for (int j = 0; j < count; j++) {
1027 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1028 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1029 dst += offset;
1030 length -= offset;
1031 }
1032 return (const char*) s;
1033 }
1034
1035 void Arguments::print_on(outputStream* st) {
1036 st->print_cr("VM Arguments:");
1037 if (num_jvm_flags() > 0) {
1038 st->print("jvm_flags: "); print_jvm_flags_on(st);
1039 st->cr();
1040 }
1041 if (num_jvm_args() > 0) {
1042 st->print("jvm_args: "); print_jvm_args_on(st);
1043 st->cr();
1044 }
1045 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1046 if (_java_class_path != NULL) {
1047 char* path = _java_class_path->value();
1048 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1049 }
1050 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1051 }
1052
1053 void Arguments::print_summary_on(outputStream* st) {
1054 // Print the command line. Environment variables that are helpful for
1055 // reproducing the problem are written later in the hs_err file.
1056 // flags are from setting file
1057 if (num_jvm_flags() > 0) {
1058 st->print_raw("Settings File: ");
1059 print_jvm_flags_on(st);
1060 st->cr();
1061 }
1062 // args are the command line and environment variable arguments.
1063 st->print_raw("Command Line: ");
1064 if (num_jvm_args() > 0) {
1065 print_jvm_args_on(st);
1066 }
1067 // this is the classfile and any arguments to the java program
1068 if (java_command() != NULL) {
1069 st->print("%s", java_command());
1070 }
1071 st->cr();
1072 }
1073
1074 void Arguments::print_jvm_flags_on(outputStream* st) {
1075 if (_num_jvm_flags > 0) {
1076 for (int i=0; i < _num_jvm_flags; i++) {
1077 st->print("%s ", _jvm_flags_array[i]);
1078 }
1079 }
1080 }
1081
1082 void Arguments::print_jvm_args_on(outputStream* st) {
1083 if (_num_jvm_args > 0) {
1084 for (int i=0; i < _num_jvm_args; i++) {
1085 st->print("%s ", _jvm_args_array[i]);
1086 }
1087 }
1088 }
1089
1090 bool Arguments::process_argument(const char* arg,
1091 jboolean ignore_unrecognized,
1092 Flag::Flags origin) {
1093 JDK_Version since = JDK_Version();
1094
1095 if (parse_argument(arg, origin)) {
1096 return true;
1097 }
1098
1099 // Determine if the flag has '+', '-', or '=' characters.
1100 bool has_plus_minus = (*arg == '+' || *arg == '-');
1101 const char* const argname = has_plus_minus ? arg + 1 : arg;
1102
1103 size_t arg_len;
1104 const char* equal_sign = strchr(argname, '=');
1105 if (equal_sign == NULL) {
1106 arg_len = strlen(argname);
1107 } else {
1108 arg_len = equal_sign - argname;
1109 }
1110
1111 // Only make the obsolete check for valid arguments.
1112 if (arg_len <= BUFLEN) {
1113 // Construct a string which consists only of the argument name without '+', '-', or '='.
1114 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1115 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1116 if (is_obsolete_flag(stripped_argname, &since)) {
1117 char version[256];
1118 since.to_string(version, sizeof(version));
1119 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1120 return true;
1121 }
1122 #ifndef PRODUCT
1123 else {
1124 const char* replacement;
1125 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1126 log_warning(arguments)("%s has been removed. Please use %s instead.",
1127 stripped_argname,
1128 replacement);
1129 return false;
1130 }
1131 }
1132 #endif //PRODUCT
1133 }
1134
1135 // For locked flags, report a custom error message if available.
1136 // Otherwise, report the standard unrecognized VM option.
1137 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1138 if (found_flag != NULL) {
1139 char locked_message_buf[BUFLEN];
1140 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1141 if (strlen(locked_message_buf) == 0) {
1142 if (found_flag->is_bool() && !has_plus_minus) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Missing +/- setting for VM option '%s'\n", argname);
1145 } else if (!found_flag->is_bool() && has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Unexpected +/- setting in VM option '%s'\n", argname);
1148 } else {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Improperly specified VM option '%s'\n", argname);
1151 }
1152 } else {
1153 #ifdef PRODUCT
1154 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1155 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1156 if (ignore_unrecognized && mismatched) {
1157 return true;
1158 }
1159 #endif
1160 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1161 }
1162 } else {
1163 if (ignore_unrecognized) {
1164 return true;
1165 }
1166 jio_fprintf(defaultStream::error_stream(),
1167 "Unrecognized VM option '%s'\n", argname);
1168 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1169 if (fuzzy_matched != NULL) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Did you mean '%s%s%s'? ",
1172 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1173 fuzzy_matched->_name,
1174 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1175 }
1176 }
1177
1178 // allow for commandline "commenting out" options like -XX:#+Verbose
1179 return arg[0] == '#';
1180 }
1181
1182 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1183 FILE* stream = fopen(file_name, "rb");
1184 if (stream == NULL) {
1185 if (should_exist) {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Could not open settings file %s\n", file_name);
1188 return false;
1189 } else {
1190 return true;
1191 }
1192 }
1193
1194 char token[1024];
1195 int pos = 0;
1196
1197 bool in_white_space = true;
1198 bool in_comment = false;
1199 bool in_quote = false;
1200 char quote_c = 0;
1201 bool result = true;
1202
1203 int c = getc(stream);
1204 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1205 if (in_white_space) {
1206 if (in_comment) {
1207 if (c == '\n') in_comment = false;
1208 } else {
1209 if (c == '#') in_comment = true;
1210 else if (!isspace(c)) {
1211 in_white_space = false;
1212 token[pos++] = c;
1213 }
1214 }
1215 } else {
1216 if (c == '\n' || (!in_quote && isspace(c))) {
1217 // token ends at newline, or at unquoted whitespace
1218 // this allows a way to include spaces in string-valued options
1219 token[pos] = '\0';
1220 logOption(token);
1221 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1222 build_jvm_flags(token);
1223 pos = 0;
1224 in_white_space = true;
1225 in_quote = false;
1226 } else if (!in_quote && (c == '\'' || c == '"')) {
1227 in_quote = true;
1228 quote_c = c;
1229 } else if (in_quote && (c == quote_c)) {
1230 in_quote = false;
1231 } else {
1232 token[pos++] = c;
1233 }
1234 }
1235 c = getc(stream);
1236 }
1237 if (pos > 0) {
1238 token[pos] = '\0';
1239 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1240 build_jvm_flags(token);
1241 }
1242 fclose(stream);
1243 return result;
1244 }
1245
1246 //=============================================================================================================
1247 // Parsing of properties (-D)
1248
1249 const char* Arguments::get_property(const char* key) {
1250 return PropertyList_get_value(system_properties(), key);
1251 }
1252
1253 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1254 const char* eq = strchr(prop, '=');
1255 const char* key;
1256 const char* value = "";
1257
1258 if (eq == NULL) {
1259 // property doesn't have a value, thus use passed string
1260 key = prop;
1261 } else {
1262 // property have a value, thus extract it and save to the
1263 // allocated string
1264 size_t key_len = eq - prop;
1265 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1266
1267 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1268 key = tmp_key;
1269
1270 value = &prop[key_len + 1];
1271 }
1272
1273 if (strcmp(key, "java.compiler") == 0) {
1274 process_java_compiler_argument(value);
1275 // Record value in Arguments, but let it get passed to Java.
1276 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1277 strcmp(key, "sun.java.launcher.pid") == 0) {
1278 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1279 // private and are processed in process_sun_java_launcher_properties();
1280 // the sun.java.launcher property is passed on to the java application
1281 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1282 // append is true, writable is true, internal is false
1283 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1284 WriteableProperty, ExternalProperty);
1285 } else {
1286 if (strcmp(key, "sun.java.command") == 0) {
1287 char *old_java_command = _java_command;
1288 _java_command = os::strdup_check_oom(value, mtArguments);
1289 if (old_java_command != NULL) {
1290 os::free(old_java_command);
1291 }
1292 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1293 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1294 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1295 // its value without going through the property list or making a Java call.
1296 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1297 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1298 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1299 os::free((void *)old_java_vendor_url_bug);
1300 }
1301 }
1302
1303 // Create new property and add at the end of the list
1304 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1305 }
1306
1307 if (key != prop) {
1308 // SystemProperty copy passed value, thus free previously allocated
1309 // memory
1310 FreeHeap((void *)key);
1311 }
1312
1313 return true;
1314 }
1315
1316 #if INCLUDE_CDS
1317 void Arguments::check_unsupported_dumping_properties() {
1318 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1319 const char* unsupported_properties[] = { "jdk.module.main",
1320 "jdk.module.limitmods",
1321 "jdk.module.path",
1322 "jdk.module.upgrade.path",
1323 "jdk.module.addmods.0" };
1324 const char* unsupported_options[] = { "-m",
1325 "--limit-modules",
1326 "--module-path",
1327 "--upgrade-module-path",
1328 "--add-modules" };
1329 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1330 // If a vm option is found in the unsupported_options array with index less than the warning_idx,
1331 // vm will exit with an error message. Otherwise, it will result in a warning message.
1332 uint warning_idx = 2;
1333 SystemProperty* sp = system_properties();
1334 while (sp != NULL) {
1335 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1336 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1337 if (i < warning_idx) {
1338 vm_exit_during_initialization(
1339 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1340 } else {
1341 warning(
1342 "the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1343 }
1344 }
1345 }
1346 sp = sp->next();
1347 }
1348
1349 // Check for an exploded module build in use with -Xshare:dump.
1350 if (!has_jimage()) {
1351 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1352 }
1353 }
1354 #endif
1355
1356 //===========================================================================================================
1357 // Setting int/mixed/comp mode flags
1358
1359 void Arguments::set_mode_flags(Mode mode) {
1360 // Set up default values for all flags.
1361 // If you add a flag to any of the branches below,
1362 // add a default value for it here.
1363 set_java_compiler(false);
1364 _mode = mode;
1365
1366 // Ensure Agent_OnLoad has the correct initial values.
1367 // This may not be the final mode; mode may change later in onload phase.
1368 PropertyList_unique_add(&_system_properties, "java.vm.info",
1369 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1370
1371 UseInterpreter = true;
1372 UseCompiler = true;
1373 UseLoopCounter = true;
1374
1375 // Default values may be platform/compiler dependent -
1376 // use the saved values
1377 ClipInlining = Arguments::_ClipInlining;
1378 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1379 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1380 BackgroundCompilation = Arguments::_BackgroundCompilation;
1381 if (TieredCompilation) {
1382 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1383 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1384 }
1385 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1386 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1387 }
1388 }
1389
1390 // Change from defaults based on mode
1391 switch (mode) {
1392 default:
1393 ShouldNotReachHere();
1394 break;
1395 case _int:
1396 UseCompiler = false;
1397 UseLoopCounter = false;
1398 AlwaysCompileLoopMethods = false;
1399 UseOnStackReplacement = false;
1400 break;
1401 case _mixed:
1402 // same as default
1403 break;
1404 case _comp:
1405 UseInterpreter = false;
1406 BackgroundCompilation = false;
1407 ClipInlining = false;
1408 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1409 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1410 // compile a level 4 (C2) and then continue executing it.
1411 if (TieredCompilation) {
1412 Tier3InvokeNotifyFreqLog = 0;
1413 Tier4InvocationThreshold = 0;
1414 }
1415 break;
1416 }
1417 }
1418
1419 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1420 // Conflict: required to use shared spaces (-Xshare:on), but
1421 // incompatible command line options were chosen.
1422
1423 static void no_shared_spaces(const char* message) {
1424 if (RequireSharedSpaces) {
1425 jio_fprintf(defaultStream::error_stream(),
1426 "Class data sharing is inconsistent with other specified options.\n");
1427 vm_exit_during_initialization("Unable to use shared archive.", message);
1428 } else {
1429 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1430 }
1431 }
1432 #endif
1433
1434 // Returns threshold scaled with the value of scale.
1435 // If scale < 0.0, threshold is returned without scaling.
1436 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1437 if (scale == 1.0 || scale < 0.0) {
1438 return threshold;
1439 } else {
1440 return (intx)(threshold * scale);
1441 }
1442 }
1443
1444 // Returns freq_log scaled with the value of scale.
1445 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1446 // If scale < 0.0, freq_log is returned without scaling.
1447 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1448 // Check if scaling is necessary or if negative value was specified.
1449 if (scale == 1.0 || scale < 0.0) {
1450 return freq_log;
1451 }
1452 // Check values to avoid calculating log2 of 0.
1453 if (scale == 0.0 || freq_log == 0) {
1454 return 0;
1455 }
1456 // Determine the maximum notification frequency value currently supported.
1457 // The largest mask value that the interpreter/C1 can handle is
1458 // of length InvocationCounter::number_of_count_bits. Mask values are always
1459 // one bit shorter then the value of the notification frequency. Set
1460 // max_freq_bits accordingly.
1461 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1462 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1463 if (scaled_freq == 0) {
1464 // Return 0 right away to avoid calculating log2 of 0.
1465 return 0;
1466 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1467 return max_freq_bits;
1468 } else {
1469 return log2_intptr(scaled_freq);
1470 }
1471 }
1472
1473 void Arguments::set_tiered_flags() {
1474 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1475 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1476 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1477 }
1478 if (CompilationPolicyChoice < 2) {
1479 vm_exit_during_initialization(
1480 "Incompatible compilation policy selected", NULL);
1481 }
1482 // Increase the code cache size - tiered compiles a lot more.
1483 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1484 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1485 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1486 }
1487 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1488 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1489 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1490 }
1491 if (!UseInterpreter) { // -Xcomp
1492 Tier3InvokeNotifyFreqLog = 0;
1493 Tier4InvocationThreshold = 0;
1494 }
1495
1496 if (CompileThresholdScaling < 0) {
1497 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1498 }
1499
1500 // Scale tiered compilation thresholds.
1501 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1502 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1503 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1504 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1505
1506 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1507 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1508 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1509 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1510
1511 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1512 // once these thresholds become supported.
1513
1514 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1515 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1516
1517 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1518 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1519
1520 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1521
1522 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1523 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1524 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1525 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1526 }
1527 }
1528
1529 #if INCLUDE_ALL_GCS
1530 static void disable_adaptive_size_policy(const char* collector_name) {
1531 if (UseAdaptiveSizePolicy) {
1532 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1533 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1534 collector_name);
1535 }
1536 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1537 }
1538 }
1539
1540 void Arguments::set_parnew_gc_flags() {
1541 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1542 "control point invariant");
1543 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1544 assert(UseParNewGC, "ParNew should always be used with CMS");
1545
1546 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1547 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1548 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1549 } else if (ParallelGCThreads == 0) {
1550 jio_fprintf(defaultStream::error_stream(),
1551 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1552 vm_exit(1);
1553 }
1554
1555 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1556 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1557 // we set them to 1024 and 1024.
1558 // See CR 6362902.
1559 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1560 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1561 }
1562 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1563 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1564 }
1565
1566 // When using compressed oops, we use local overflow stacks,
1567 // rather than using a global overflow list chained through
1568 // the klass word of the object's pre-image.
1569 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1570 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1571 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1572 }
1573 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1574 }
1575 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1576 }
1577
1578 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1579 // sparc/solaris for certain applications, but would gain from
1580 // further optimization and tuning efforts, and would almost
1581 // certainly gain from analysis of platform and environment.
1582 void Arguments::set_cms_and_parnew_gc_flags() {
1583 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1584 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1585 assert(UseParNewGC, "ParNew should always be used with CMS");
1586
1587 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1588 disable_adaptive_size_policy("UseConcMarkSweepGC");
1589
1590 set_parnew_gc_flags();
1591
1592 size_t max_heap = align_size_down(MaxHeapSize,
1593 CardTableRS::ct_max_alignment_constraint());
1594
1595 // Now make adjustments for CMS
1596 intx tenuring_default = (intx)6;
1597 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1598
1599 // Preferred young gen size for "short" pauses:
1600 // upper bound depends on # of threads and NewRatio.
1601 const size_t preferred_max_new_size_unaligned =
1602 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1603 size_t preferred_max_new_size =
1604 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1605
1606 // Unless explicitly requested otherwise, size young gen
1607 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1608
1609 // If either MaxNewSize or NewRatio is set on the command line,
1610 // assume the user is trying to set the size of the young gen.
1611 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1612
1613 // Set MaxNewSize to our calculated preferred_max_new_size unless
1614 // NewSize was set on the command line and it is larger than
1615 // preferred_max_new_size.
1616 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1617 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1618 } else {
1619 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1620 }
1621 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1622
1623 // Code along this path potentially sets NewSize and OldSize
1624 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1625 min_heap_size(), InitialHeapSize, max_heap);
1626 size_t min_new = preferred_max_new_size;
1627 if (FLAG_IS_CMDLINE(NewSize)) {
1628 min_new = NewSize;
1629 }
1630 if (max_heap > min_new && min_heap_size() > min_new) {
1631 // Unless explicitly requested otherwise, make young gen
1632 // at least min_new, and at most preferred_max_new_size.
1633 if (FLAG_IS_DEFAULT(NewSize)) {
1634 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1635 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1636 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1637 }
1638 // Unless explicitly requested otherwise, size old gen
1639 // so it's NewRatio x of NewSize.
1640 if (FLAG_IS_DEFAULT(OldSize)) {
1641 if (max_heap > NewSize) {
1642 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1643 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1644 }
1645 }
1646 }
1647 }
1648 // Unless explicitly requested otherwise, definitely
1649 // promote all objects surviving "tenuring_default" scavenges.
1650 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1651 FLAG_IS_DEFAULT(SurvivorRatio)) {
1652 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1653 }
1654 // If we decided above (or user explicitly requested)
1655 // `promote all' (via MaxTenuringThreshold := 0),
1656 // prefer minuscule survivor spaces so as not to waste
1657 // space for (non-existent) survivors
1658 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1659 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1660 }
1661
1662 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1663 // but rather the number of free blocks of a given size that are used when
1664 // replenishing the local per-worker free list caches.
1665 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1666 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1667 // OldPLAB sizing manually turned off: Use a larger default setting,
1668 // unless it was manually specified. This is because a too-low value
1669 // will slow down scavenges.
1670 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1671 } else {
1672 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1673 }
1674 }
1675
1676 // If either of the static initialization defaults have changed, note this
1677 // modification.
1678 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1679 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1680 }
1681
1682 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1683 }
1684 #endif // INCLUDE_ALL_GCS
1685
1686 void set_object_alignment() {
1687 // Object alignment.
1688 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1689 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1690 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1691 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1692 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1693 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1694
1695 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1696 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1697
1698 // Oop encoding heap max
1699 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1700
1701 if (SurvivorAlignmentInBytes == 0) {
1702 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1703 }
1704
1705 #if INCLUDE_ALL_GCS
1706 // Set CMS global values
1707 CompactibleFreeListSpace::set_cms_values();
1708 #endif // INCLUDE_ALL_GCS
1709 }
1710
1711 size_t Arguments::max_heap_for_compressed_oops() {
1712 // Avoid sign flip.
1713 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1714 // We need to fit both the NULL page and the heap into the memory budget, while
1715 // keeping alignment constraints of the heap. To guarantee the latter, as the
1716 // NULL page is located before the heap, we pad the NULL page to the conservative
1717 // maximum alignment that the GC may ever impose upon the heap.
1718 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1719 _conservative_max_heap_alignment);
1720
1721 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1722 NOT_LP64(ShouldNotReachHere(); return 0);
1723 }
1724
1725 bool Arguments::should_auto_select_low_pause_collector() {
1726 if (UseAutoGCSelectPolicy &&
1727 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1728 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1729 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1730 return true;
1731 }
1732 return false;
1733 }
1734
1735 void Arguments::set_use_compressed_oops() {
1736 #ifndef ZERO
1737 #ifdef _LP64
1738 // MaxHeapSize is not set up properly at this point, but
1739 // the only value that can override MaxHeapSize if we are
1740 // to use UseCompressedOops is InitialHeapSize.
1741 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1742
1743 if (max_heap_size <= max_heap_for_compressed_oops()) {
1744 #if !defined(COMPILER1) || defined(TIERED)
1745 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1746 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1747 }
1748 #endif
1749 } else {
1750 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1751 warning("Max heap size too large for Compressed Oops");
1752 FLAG_SET_DEFAULT(UseCompressedOops, false);
1753 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1754 }
1755 }
1756 #endif // _LP64
1757 #endif // ZERO
1758 }
1759
1760
1761 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1762 // set_use_compressed_oops().
1763 void Arguments::set_use_compressed_klass_ptrs() {
1764 #ifndef ZERO
1765 #ifdef _LP64
1766 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1767 if (!UseCompressedOops) {
1768 if (UseCompressedClassPointers) {
1769 warning("UseCompressedClassPointers requires UseCompressedOops");
1770 }
1771 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1772 } else {
1773 // Turn on UseCompressedClassPointers too
1774 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1775 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1776 }
1777 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1778 if (UseCompressedClassPointers) {
1779 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1780 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1781 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1782 }
1783 }
1784 }
1785 #endif // _LP64
1786 #endif // !ZERO
1787 }
1788
1789 void Arguments::set_conservative_max_heap_alignment() {
1790 // The conservative maximum required alignment for the heap is the maximum of
1791 // the alignments imposed by several sources: any requirements from the heap
1792 // itself, the collector policy and the maximum page size we may run the VM
1793 // with.
1794 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1795 #if INCLUDE_ALL_GCS
1796 if (UseParallelGC) {
1797 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1798 } else if (UseG1GC) {
1799 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1800 }
1801 #endif // INCLUDE_ALL_GCS
1802 _conservative_max_heap_alignment = MAX4(heap_alignment,
1803 (size_t)os::vm_allocation_granularity(),
1804 os::max_page_size(),
1805 CollectorPolicy::compute_heap_alignment());
1806 }
1807
1808 bool Arguments::gc_selected() {
1809 #if INCLUDE_ALL_GCS
1810 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1811 #else
1812 return UseSerialGC;
1813 #endif // INCLUDE_ALL_GCS
1814 }
1815
1816 void Arguments::select_gc_ergonomically() {
1817 #if INCLUDE_ALL_GCS
1818 if (os::is_server_class_machine()) {
1819 if (!UseAutoGCSelectPolicy) {
1820 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1821 } else {
1822 if (should_auto_select_low_pause_collector()) {
1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1824 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1825 } else {
1826 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1827 }
1828 }
1829 } else {
1830 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1831 }
1832 #else
1833 UNSUPPORTED_OPTION(UseG1GC);
1834 UNSUPPORTED_OPTION(UseParallelGC);
1835 UNSUPPORTED_OPTION(UseParallelOldGC);
1836 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1837 UNSUPPORTED_OPTION(UseParNewGC);
1838 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1839 #endif // INCLUDE_ALL_GCS
1840 }
1841
1842 void Arguments::select_gc() {
1843 if (!gc_selected()) {
1844 select_gc_ergonomically();
1845 if (!gc_selected()) {
1846 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1847 }
1848 }
1849 }
1850
1851 void Arguments::set_ergonomics_flags() {
1852 select_gc();
1853
1854 #if defined(COMPILER2) || INCLUDE_JVMCI
1855 // Shared spaces work fine with other GCs but causes bytecode rewriting
1856 // to be disabled, which hurts interpreter performance and decreases
1857 // server performance. When -server is specified, keep the default off
1858 // unless it is asked for. Future work: either add bytecode rewriting
1859 // at link time, or rewrite bytecodes in non-shared methods.
1860 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1861 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1862 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1863 }
1864 #endif
1865
1866 set_conservative_max_heap_alignment();
1867
1868 #ifndef ZERO
1869 #ifdef _LP64
1870 set_use_compressed_oops();
1871
1872 // set_use_compressed_klass_ptrs() must be called after calling
1873 // set_use_compressed_oops().
1874 set_use_compressed_klass_ptrs();
1875
1876 // Also checks that certain machines are slower with compressed oops
1877 // in vm_version initialization code.
1878 #endif // _LP64
1879 #endif // !ZERO
1880
1881 CodeCacheExtensions::set_ergonomics_flags();
1882 }
1883
1884 void Arguments::set_parallel_gc_flags() {
1885 assert(UseParallelGC || UseParallelOldGC, "Error");
1886 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1887 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1888 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1889 }
1890 FLAG_SET_DEFAULT(UseParallelGC, true);
1891
1892 // If no heap maximum was requested explicitly, use some reasonable fraction
1893 // of the physical memory, up to a maximum of 1GB.
1894 FLAG_SET_DEFAULT(ParallelGCThreads,
1895 Abstract_VM_Version::parallel_worker_threads());
1896 if (ParallelGCThreads == 0) {
1897 jio_fprintf(defaultStream::error_stream(),
1898 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1899 vm_exit(1);
1900 }
1901
1902 if (UseAdaptiveSizePolicy) {
1903 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1904 // unless the user actually sets these flags.
1905 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1906 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1907 }
1908 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1909 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1910 }
1911 }
1912
1913 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1914 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1915 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1916 // See CR 6362902 for details.
1917 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1918 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1919 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1920 }
1921 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1922 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1923 }
1924 }
1925
1926 if (UseParallelOldGC) {
1927 // Par compact uses lower default values since they are treated as
1928 // minimums. These are different defaults because of the different
1929 // interpretation and are not ergonomically set.
1930 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1931 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1932 }
1933 }
1934 }
1935
1936 void Arguments::set_g1_gc_flags() {
1937 assert(UseG1GC, "Error");
1938 #if defined(COMPILER1) || INCLUDE_JVMCI
1939 FastTLABRefill = false;
1940 #endif
1941 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1942 if (ParallelGCThreads == 0) {
1943 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1944 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1945 }
1946
1947 #if INCLUDE_ALL_GCS
1948 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1949 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1950 }
1951 #endif
1952
1953 // MarkStackSize will be set (if it hasn't been set by the user)
1954 // when concurrent marking is initialized.
1955 // Its value will be based upon the number of parallel marking threads.
1956 // But we do set the maximum mark stack size here.
1957 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1958 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1959 }
1960
1961 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1962 // In G1, we want the default GC overhead goal to be higher than
1963 // it is for PS, or the heap might be expanded too aggressively.
1964 // We set it here to ~8%.
1965 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1966 }
1967
1968 // Below, we might need to calculate the pause time interval based on
1969 // the pause target. When we do so we are going to give G1 maximum
1970 // flexibility and allow it to do pauses when it needs to. So, we'll
1971 // arrange that the pause interval to be pause time target + 1 to
1972 // ensure that a) the pause time target is maximized with respect to
1973 // the pause interval and b) we maintain the invariant that pause
1974 // time target < pause interval. If the user does not want this
1975 // maximum flexibility, they will have to set the pause interval
1976 // explicitly.
1977
1978 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1979 // The default pause time target in G1 is 200ms
1980 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1981 }
1982
1983 // Then, if the interval parameter was not set, set it according to
1984 // the pause time target (this will also deal with the case when the
1985 // pause time target is the default value).
1986 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1987 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1988 }
1989
1990 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1991 }
1992
1993 void Arguments::set_gc_specific_flags() {
1994 #if INCLUDE_ALL_GCS
1995 // Set per-collector flags
1996 if (UseParallelGC || UseParallelOldGC) {
1997 set_parallel_gc_flags();
1998 } else if (UseConcMarkSweepGC) {
1999 set_cms_and_parnew_gc_flags();
2000 } else if (UseG1GC) {
2001 set_g1_gc_flags();
2002 }
2003 if (AssumeMP && !UseSerialGC) {
2004 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2005 warning("If the number of processors is expected to increase from one, then"
2006 " you should configure the number of parallel GC threads appropriately"
2007 " using -XX:ParallelGCThreads=N");
2008 }
2009 }
2010 if (MinHeapFreeRatio == 100) {
2011 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2012 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2013 }
2014
2015 // If class unloading is disabled, also disable concurrent class unloading.
2016 if (!ClassUnloading) {
2017 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2018 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2019 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2020 }
2021 #endif // INCLUDE_ALL_GCS
2022 }
2023
2024 julong Arguments::limit_by_allocatable_memory(julong limit) {
2025 julong max_allocatable;
2026 julong result = limit;
2027 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2028 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2029 }
2030 return result;
2031 }
2032
2033 // Use static initialization to get the default before parsing
2034 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2035
2036 void Arguments::set_heap_size() {
2037 const julong phys_mem =
2038 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2039 : (julong)MaxRAM;
2040
2041 // If the maximum heap size has not been set with -Xmx,
2042 // then set it as fraction of the size of physical memory,
2043 // respecting the maximum and minimum sizes of the heap.
2044 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2045 julong reasonable_max = phys_mem / MaxRAMFraction;
2046
2047 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2048 // Small physical memory, so use a minimum fraction of it for the heap
2049 reasonable_max = phys_mem / MinRAMFraction;
2050 } else {
2051 // Not-small physical memory, so require a heap at least
2052 // as large as MaxHeapSize
2053 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2054 }
2055 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2056 // Limit the heap size to ErgoHeapSizeLimit
2057 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2058 }
2059 if (UseCompressedOops) {
2060 // Limit the heap size to the maximum possible when using compressed oops
2061 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2062
2063 // HeapBaseMinAddress can be greater than default but not less than.
2064 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2065 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2066 // matches compressed oops printing flags
2067 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2068 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2069 DefaultHeapBaseMinAddress,
2070 DefaultHeapBaseMinAddress/G,
2071 HeapBaseMinAddress);
2072 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2073 }
2074 }
2075
2076 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2077 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2078 // but it should be not less than default MaxHeapSize.
2079 max_coop_heap -= HeapBaseMinAddress;
2080 }
2081 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2082 }
2083 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2084
2085 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2086 // An initial heap size was specified on the command line,
2087 // so be sure that the maximum size is consistent. Done
2088 // after call to limit_by_allocatable_memory because that
2089 // method might reduce the allocation size.
2090 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2091 }
2092
2093 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2094 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2095 }
2096
2097 // If the minimum or initial heap_size have not been set or requested to be set
2098 // ergonomically, set them accordingly.
2099 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2100 julong reasonable_minimum = (julong)(OldSize + NewSize);
2101
2102 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2103
2104 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2105
2106 if (InitialHeapSize == 0) {
2107 julong reasonable_initial = phys_mem / InitialRAMFraction;
2108
2109 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2110 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2111
2112 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2113
2114 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2115 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2116 }
2117 // If the minimum heap size has not been set (via -Xms),
2118 // synchronize with InitialHeapSize to avoid errors with the default value.
2119 if (min_heap_size() == 0) {
2120 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2121 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2122 }
2123 }
2124 }
2125
2126 // This option inspects the machine and attempts to set various
2127 // parameters to be optimal for long-running, memory allocation
2128 // intensive jobs. It is intended for machines with large
2129 // amounts of cpu and memory.
2130 jint Arguments::set_aggressive_heap_flags() {
2131 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2132 // VM, but we may not be able to represent the total physical memory
2133 // available (like having 8gb of memory on a box but using a 32bit VM).
2134 // Thus, we need to make sure we're using a julong for intermediate
2135 // calculations.
2136 julong initHeapSize;
2137 julong total_memory = os::physical_memory();
2138
2139 if (total_memory < (julong) 256 * M) {
2140 jio_fprintf(defaultStream::error_stream(),
2141 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2142 vm_exit(1);
2143 }
2144
2145 // The heap size is half of available memory, or (at most)
2146 // all of possible memory less 160mb (leaving room for the OS
2147 // when using ISM). This is the maximum; because adaptive sizing
2148 // is turned on below, the actual space used may be smaller.
2149
2150 initHeapSize = MIN2(total_memory / (julong) 2,
2151 total_memory - (julong) 160 * M);
2152
2153 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2154
2155 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2156 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2157 return JNI_EINVAL;
2158 }
2159 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 // Currently the minimum size and the initial heap sizes are the same.
2163 set_min_heap_size(initHeapSize);
2164 }
2165 if (FLAG_IS_DEFAULT(NewSize)) {
2166 // Make the young generation 3/8ths of the total heap.
2167 if (FLAG_SET_CMDLINE(size_t, NewSize,
2168 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2169 return JNI_EINVAL;
2170 }
2171 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 }
2175
2176 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2177 FLAG_SET_DEFAULT(UseLargePages, true);
2178 #endif
2179
2180 // Increase some data structure sizes for efficiency
2181 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2185 return JNI_EINVAL;
2186 }
2187 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190
2191 // See the OldPLABSize comment below, but replace 'after promotion'
2192 // with 'after copying'. YoungPLABSize is the size of the survivor
2193 // space per-gc-thread buffers. The default is 4kw.
2194 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2195 return JNI_EINVAL;
2196 }
2197
2198 // OldPLABSize is the size of the buffers in the old gen that
2199 // UseParallelGC uses to promote live data that doesn't fit in the
2200 // survivor spaces. At any given time, there's one for each gc thread.
2201 // The default size is 1kw. These buffers are rarely used, since the
2202 // survivor spaces are usually big enough. For specjbb, however, there
2203 // are occasions when there's lots of live data in the young gen
2204 // and we end up promoting some of it. We don't have a definite
2205 // explanation for why bumping OldPLABSize helps, but the theory
2206 // is that a bigger PLAB results in retaining something like the
2207 // original allocation order after promotion, which improves mutator
2208 // locality. A minor effect may be that larger PLABs reduce the
2209 // number of PLAB allocation events during gc. The value of 8kw
2210 // was arrived at by experimenting with specjbb.
2211 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2212 return JNI_EINVAL;
2213 }
2214
2215 // Enable parallel GC and adaptive generation sizing
2216 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2217 return JNI_EINVAL;
2218 }
2219 FLAG_SET_DEFAULT(ParallelGCThreads,
2220 Abstract_VM_Version::parallel_worker_threads());
2221
2222 // Encourage steady state memory management
2223 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2224 return JNI_EINVAL;
2225 }
2226
2227 // This appears to improve mutator locality
2228 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231
2232 // Get around early Solaris scheduling bug
2233 // (affinity vs other jobs on system)
2234 // but disallow DR and offlining (5008695).
2235 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2236 return JNI_EINVAL;
2237 }
2238
2239 return JNI_OK;
2240 }
2241
2242 // This must be called after ergonomics.
2243 void Arguments::set_bytecode_flags() {
2244 if (!RewriteBytecodes) {
2245 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2246 }
2247 }
2248
2249 // Aggressive optimization flags -XX:+AggressiveOpts
2250 jint Arguments::set_aggressive_opts_flags() {
2251 #ifdef COMPILER2
2252 if (AggressiveUnboxing) {
2253 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2254 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2255 } else if (!EliminateAutoBox) {
2256 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2257 AggressiveUnboxing = false;
2258 }
2259 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2260 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2261 } else if (!DoEscapeAnalysis) {
2262 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2263 AggressiveUnboxing = false;
2264 }
2265 }
2266 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2267 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2268 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2269 }
2270 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2271 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2272 }
2273
2274 // Feed the cache size setting into the JDK
2275 char buffer[1024];
2276 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2277 if (!add_property(buffer)) {
2278 return JNI_ENOMEM;
2279 }
2280 }
2281 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2282 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2283 }
2284 #endif
2285
2286 if (AggressiveOpts) {
2287 // Sample flag setting code
2288 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2289 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2290 // }
2291 }
2292
2293 return JNI_OK;
2294 }
2295
2296 //===========================================================================================================
2297 // Parsing of java.compiler property
2298
2299 void Arguments::process_java_compiler_argument(const char* arg) {
2300 // For backwards compatibility, Djava.compiler=NONE or ""
2301 // causes us to switch to -Xint mode UNLESS -Xdebug
2302 // is also specified.
2303 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2304 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2305 }
2306 }
2307
2308 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2309 _sun_java_launcher = os::strdup_check_oom(launcher);
2310 }
2311
2312 bool Arguments::created_by_java_launcher() {
2313 assert(_sun_java_launcher != NULL, "property must have value");
2314 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2315 }
2316
2317 bool Arguments::sun_java_launcher_is_altjvm() {
2318 return _sun_java_launcher_is_altjvm;
2319 }
2320
2321 //===========================================================================================================
2322 // Parsing of main arguments
2323
2324 #if INCLUDE_JVMCI
2325 // Check consistency of jvmci vm argument settings.
2326 bool Arguments::check_jvmci_args_consistency() {
2327 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2328 }
2329 #endif //INCLUDE_JVMCI
2330
2331 // Check consistency of GC selection
2332 bool Arguments::check_gc_consistency() {
2333 // Ensure that the user has not selected conflicting sets
2334 // of collectors.
2335 uint i = 0;
2336 if (UseSerialGC) i++;
2337 if (UseConcMarkSweepGC) i++;
2338 if (UseParallelGC || UseParallelOldGC) i++;
2339 if (UseG1GC) i++;
2340 if (i > 1) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Conflicting collector combinations in option list; "
2343 "please refer to the release notes for the combinations "
2344 "allowed\n");
2345 return false;
2346 }
2347
2348 if (UseConcMarkSweepGC && !UseParNewGC) {
2349 jio_fprintf(defaultStream::error_stream(),
2350 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2351 return false;
2352 }
2353
2354 if (UseParNewGC && !UseConcMarkSweepGC) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2357 return false;
2358 }
2359
2360 return true;
2361 }
2362
2363 // Check the consistency of vm_init_args
2364 bool Arguments::check_vm_args_consistency() {
2365 // Method for adding checks for flag consistency.
2366 // The intent is to warn the user of all possible conflicts,
2367 // before returning an error.
2368 // Note: Needs platform-dependent factoring.
2369 bool status = true;
2370
2371 if (TLABRefillWasteFraction == 0) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "TLABRefillWasteFraction should be a denominator, "
2374 "not " SIZE_FORMAT "\n",
2375 TLABRefillWasteFraction);
2376 status = false;
2377 }
2378
2379 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2380 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2381 }
2382
2383 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2384 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2385 }
2386
2387 if (GCTimeLimit == 100) {
2388 // Turn off gc-overhead-limit-exceeded checks
2389 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2390 }
2391
2392 status = status && check_gc_consistency();
2393
2394 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2395 // insists that we hold the requisite locks so that the iteration is
2396 // MT-safe. For the verification at start-up and shut-down, we don't
2397 // yet have a good way of acquiring and releasing these locks,
2398 // which are not visible at the CollectedHeap level. We want to
2399 // be able to acquire these locks and then do the iteration rather
2400 // than just disable the lock verification. This will be fixed under
2401 // bug 4788986.
2402 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2403 if (VerifyDuringStartup) {
2404 warning("Heap verification at start-up disabled "
2405 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2406 VerifyDuringStartup = false; // Disable verification at start-up
2407 }
2408
2409 if (VerifyBeforeExit) {
2410 warning("Heap verification at shutdown disabled "
2411 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2412 VerifyBeforeExit = false; // Disable verification at shutdown
2413 }
2414 }
2415
2416 if (PrintNMTStatistics) {
2417 #if INCLUDE_NMT
2418 if (MemTracker::tracking_level() == NMT_off) {
2419 #endif // INCLUDE_NMT
2420 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2421 PrintNMTStatistics = false;
2422 #if INCLUDE_NMT
2423 }
2424 #endif
2425 }
2426 #if INCLUDE_JVMCI
2427
2428 status = status && check_jvmci_args_consistency();
2429
2430 if (EnableJVMCI) {
2431 if (!ScavengeRootsInCode) {
2432 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2433 ScavengeRootsInCode = 1;
2434 }
2435 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2436 TypeProfileLevel = 0;
2437 }
2438 if (UseJVMCICompiler) {
2439 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2440 TypeProfileWidth = 8;
2441 }
2442 }
2443 }
2444 #endif
2445
2446 // Check lower bounds of the code cache
2447 // Template Interpreter code is approximately 3X larger in debug builds.
2448 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2449 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2452 os::vm_page_size()/K);
2453 status = false;
2454 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2457 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2458 status = false;
2459 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2462 min_code_cache_size/K);
2463 status = false;
2464 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2465 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2466 jio_fprintf(defaultStream::error_stream(),
2467 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2468 CODE_CACHE_SIZE_LIMIT/M);
2469 status = false;
2470 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2471 jio_fprintf(defaultStream::error_stream(),
2472 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2473 min_code_cache_size/K);
2474 status = false;
2475 }
2476
2477 #ifdef _LP64
2478 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2479 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2480 }
2481 #endif
2482
2483 #ifndef SUPPORT_RESERVED_STACK_AREA
2484 if (StackReservedPages != 0) {
2485 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2486 warning("Reserved Stack Area not supported on this platform");
2487 }
2488 #endif
2489
2490 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2491 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2492 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2493 }
2494 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2495 }
2496 if (UseCompiler && is_interpreter_only()) {
2497 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2498 warning("UseCompiler disabled due to -Xint.");
2499 }
2500 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2501 }
2502 #ifdef COMPILER2
2503 if (PostLoopMultiversioning && !RangeCheckElimination) {
2504 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2505 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2506 }
2507 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2508 }
2509 #endif
2510 return status;
2511 }
2512
2513 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2514 const char* option_type) {
2515 if (ignore) return false;
2516
2517 const char* spacer = " ";
2518 if (option_type == NULL) {
2519 option_type = ++spacer; // Set both to the empty string.
2520 }
2521
2522 if (os::obsolete_option(option)) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Obsolete %s%soption: %s\n", option_type, spacer,
2525 option->optionString);
2526 return false;
2527 } else {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Unrecognized %s%soption: %s\n", option_type, spacer,
2530 option->optionString);
2531 return true;
2532 }
2533 }
2534
2535 static const char* user_assertion_options[] = {
2536 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2537 };
2538
2539 static const char* system_assertion_options[] = {
2540 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2541 };
2542
2543 bool Arguments::parse_uintx(const char* value,
2544 uintx* uintx_arg,
2545 uintx min_size) {
2546
2547 // Check the sign first since atojulong() parses only unsigned values.
2548 bool value_is_positive = !(*value == '-');
2549
2550 if (value_is_positive) {
2551 julong n;
2552 bool good_return = atojulong(value, &n);
2553 if (good_return) {
2554 bool above_minimum = n >= min_size;
2555 bool value_is_too_large = n > max_uintx;
2556
2557 if (above_minimum && !value_is_too_large) {
2558 *uintx_arg = n;
2559 return true;
2560 }
2561 }
2562 }
2563 return false;
2564 }
2565
2566 unsigned int addreads_count = 0;
2567 unsigned int addexports_count = 0;
2568 unsigned int addmods_count = 0;
2569 unsigned int patch_mod_count = 0;
2570
2571 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2572 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2573 char* property = AllocateHeap(prop_len, mtArguments);
2574 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2575 if (ret < 0 || ret >= (int)prop_len) {
2576 FreeHeap(property);
2577 return false;
2578 }
2579 bool added = add_property(property, UnwriteableProperty, internal);
2580 FreeHeap(property);
2581 return added;
2582 }
2583
2584 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2585 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2586 if (count < 1000) {
2587 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2588 char* property = AllocateHeap(prop_len, mtArguments);
2589 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2590 if (ret < 0 || ret >= (int)prop_len) {
2591 FreeHeap(property);
2592 return false;
2593 }
2594 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2595 FreeHeap(property);
2596 return added;
2597 }
2598 return false;
2599 }
2600
2601 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2602 julong* long_arg,
2603 julong min_size) {
2604 if (!atojulong(s, long_arg)) return arg_unreadable;
2605 return check_memory_size(*long_arg, min_size);
2606 }
2607
2608 // Parse JavaVMInitArgs structure
2609
2610 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2611 const JavaVMInitArgs *java_options_args,
2612 const JavaVMInitArgs *cmd_line_args) {
2613 bool patch_mod_javabase = false;
2614
2615 // Save default settings for some mode flags
2616 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2617 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2618 Arguments::_ClipInlining = ClipInlining;
2619 Arguments::_BackgroundCompilation = BackgroundCompilation;
2620 if (TieredCompilation) {
2621 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2622 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2623 }
2624
2625 // Setup flags for mixed which is the default
2626 set_mode_flags(_mixed);
2627
2628 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2629 // variable (if present).
2630 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Parse args structure generated from the command line flags.
2636 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2637 if (result != JNI_OK) {
2638 return result;
2639 }
2640
2641 // Parse args structure generated from the _JAVA_OPTIONS environment
2642 // variable (if present) (mimics classic VM)
2643 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2644 if (result != JNI_OK) {
2645 return result;
2646 }
2647
2648 // Do final processing now that all arguments have been parsed
2649 result = finalize_vm_init_args();
2650 if (result != JNI_OK) {
2651 return result;
2652 }
2653
2654 return JNI_OK;
2655 }
2656
2657 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2658 // represents a valid JDWP agent. is_path==true denotes that we
2659 // are dealing with -agentpath (case where name is a path), otherwise with
2660 // -agentlib
2661 bool valid_jdwp_agent(char *name, bool is_path) {
2662 char *_name;
2663 const char *_jdwp = "jdwp";
2664 size_t _len_jdwp, _len_prefix;
2665
2666 if (is_path) {
2667 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2668 return false;
2669 }
2670
2671 _name++; // skip past last path separator
2672 _len_prefix = strlen(JNI_LIB_PREFIX);
2673
2674 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2675 return false;
2676 }
2677
2678 _name += _len_prefix;
2679 _len_jdwp = strlen(_jdwp);
2680
2681 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2682 _name += _len_jdwp;
2683 }
2684 else {
2685 return false;
2686 }
2687
2688 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2689 return false;
2690 }
2691
2692 return true;
2693 }
2694
2695 if (strcmp(name, _jdwp) == 0) {
2696 return true;
2697 }
2698
2699 return false;
2700 }
2701
2702 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2703 // --patch-module=<module>=<file>(<pathsep><file>)*
2704 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2705 // Find the equal sign between the module name and the path specification
2706 const char* module_equal = strchr(patch_mod_tail, '=');
2707 if (module_equal == NULL) {
2708 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2709 return JNI_ERR;
2710 } else {
2711 // Pick out the module name
2712 size_t module_len = module_equal - patch_mod_tail;
2713 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2714 if (module_name != NULL) {
2715 memcpy(module_name, patch_mod_tail, module_len);
2716 *(module_name + module_len) = '\0';
2717 // The path piece begins one past the module_equal sign
2718 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2719 FREE_C_HEAP_ARRAY(char, module_name);
2720 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2721 return JNI_ENOMEM;
2722 }
2723 } else {
2724 return JNI_ENOMEM;
2725 }
2726 }
2727 return JNI_OK;
2728 }
2729
2730 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2731 // For match_option to return remaining or value part of option string
2732 const char* tail;
2733
2734 // iterate over arguments
2735 for (int index = 0; index < args->nOptions; index++) {
2736 bool is_absolute_path = false; // for -agentpath vs -agentlib
2737
2738 const JavaVMOption* option = args->options + index;
2739
2740 if (!match_option(option, "-Djava.class.path", &tail) &&
2741 !match_option(option, "-Dsun.java.command", &tail) &&
2742 !match_option(option, "-Dsun.java.launcher", &tail)) {
2743
2744 // add all jvm options to the jvm_args string. This string
2745 // is used later to set the java.vm.args PerfData string constant.
2746 // the -Djava.class.path and the -Dsun.java.command options are
2747 // omitted from jvm_args string as each have their own PerfData
2748 // string constant object.
2749 build_jvm_args(option->optionString);
2750 }
2751
2752 // -verbose:[class/gc/jni]
2753 if (match_option(option, "-verbose", &tail)) {
2754 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2755 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2756 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2757 } else if (!strcmp(tail, ":gc")) {
2758 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2759 } else if (!strcmp(tail, ":jni")) {
2760 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 }
2764 // -da / -ea / -disableassertions / -enableassertions
2765 // These accept an optional class/package name separated by a colon, e.g.,
2766 // -da:java.lang.Thread.
2767 } else if (match_option(option, user_assertion_options, &tail, true)) {
2768 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2769 if (*tail == '\0') {
2770 JavaAssertions::setUserClassDefault(enable);
2771 } else {
2772 assert(*tail == ':', "bogus match by match_option()");
2773 JavaAssertions::addOption(tail + 1, enable);
2774 }
2775 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2776 } else if (match_option(option, system_assertion_options, &tail, false)) {
2777 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2778 JavaAssertions::setSystemClassDefault(enable);
2779 // -bootclasspath:
2780 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2781 jio_fprintf(defaultStream::output_stream(),
2782 "-Xbootclasspath is no longer a supported option.\n");
2783 return JNI_EINVAL;
2784 // -bootclasspath/a:
2785 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2786 Arguments::append_sysclasspath(tail);
2787 // -bootclasspath/p:
2788 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2789 jio_fprintf(defaultStream::output_stream(),
2790 "-Xbootclasspath/p is no longer a supported option.\n");
2791 return JNI_EINVAL;
2792 // -Xrun
2793 } else if (match_option(option, "-Xrun", &tail)) {
2794 if (tail != NULL) {
2795 const char* pos = strchr(tail, ':');
2796 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2797 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2798 jio_snprintf(name, len + 1, "%s", tail);
2799
2800 char *options = NULL;
2801 if(pos != NULL) {
2802 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2803 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2804 }
2805 #if !INCLUDE_JVMTI
2806 if (strcmp(name, "jdwp") == 0) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Debugging agents are not supported in this VM\n");
2809 return JNI_ERR;
2810 }
2811 #endif // !INCLUDE_JVMTI
2812 add_init_library(name, options);
2813 }
2814 } else if (match_option(option, "--add-reads=", &tail)) {
2815 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2816 return JNI_ENOMEM;
2817 }
2818 } else if (match_option(option, "--add-exports=", &tail)) {
2819 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2820 return JNI_ENOMEM;
2821 }
2822 } else if (match_option(option, "--add-modules=", &tail)) {
2823 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2824 return JNI_ENOMEM;
2825 }
2826 } else if (match_option(option, "--limit-modules=", &tail)) {
2827 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2828 return JNI_ENOMEM;
2829 }
2830 } else if (match_option(option, "--module-path=", &tail)) {
2831 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2832 return JNI_ENOMEM;
2833 }
2834 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2835 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2836 return JNI_ENOMEM;
2837 }
2838 } else if (match_option(option, "--patch-module=", &tail)) {
2839 // --patch-module=<module>=<file>(<pathsep><file>)*
2840 int res = process_patch_mod_option(tail, patch_mod_javabase);
2841 if (res != JNI_OK) {
2842 return res;
2843 }
2844 // -agentlib and -agentpath
2845 } else if (match_option(option, "-agentlib:", &tail) ||
2846 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2847 if(tail != NULL) {
2848 const char* pos = strchr(tail, '=');
2849 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2850 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2851 name[len] = '\0';
2852
2853 char *options = NULL;
2854 if(pos != NULL) {
2855 options = os::strdup_check_oom(pos + 1, mtArguments);
2856 }
2857 #if !INCLUDE_JVMTI
2858 if (valid_jdwp_agent(name, is_absolute_path)) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Debugging agents are not supported in this VM\n");
2861 return JNI_ERR;
2862 }
2863 #endif // !INCLUDE_JVMTI
2864 add_init_agent(name, options, is_absolute_path);
2865 }
2866 // -javaagent
2867 } else if (match_option(option, "-javaagent:", &tail)) {
2868 #if !INCLUDE_JVMTI
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Instrumentation agents are not supported in this VM\n");
2871 return JNI_ERR;
2872 #else
2873 if (tail != NULL) {
2874 size_t length = strlen(tail) + 1;
2875 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2876 jio_snprintf(options, length, "%s", tail);
2877 add_init_agent("instrument", options, false);
2878 // java agents need module java.instrument
2879 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2880 return JNI_ENOMEM;
2881 }
2882 }
2883 #endif // !INCLUDE_JVMTI
2884 // -Xnoclassgc
2885 } else if (match_option(option, "-Xnoclassgc")) {
2886 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2887 return JNI_EINVAL;
2888 }
2889 // -Xconcgc
2890 } else if (match_option(option, "-Xconcgc")) {
2891 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2895 // -Xnoconcgc
2896 } else if (match_option(option, "-Xnoconcgc")) {
2897 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2901 // -Xbatch
2902 } else if (match_option(option, "-Xbatch")) {
2903 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 // -Xmn for compatibility with other JVM vendors
2907 } else if (match_option(option, "-Xmn", &tail)) {
2908 julong long_initial_young_size = 0;
2909 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2910 if (errcode != arg_in_range) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Invalid initial young generation size: %s\n", option->optionString);
2913 describe_range_error(errcode);
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 // -Xms
2923 } else if (match_option(option, "-Xms", &tail)) {
2924 julong long_initial_heap_size = 0;
2925 // an initial heap size of 0 means automatically determine
2926 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2927 if (errcode != arg_in_range) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Invalid initial heap size: %s\n", option->optionString);
2930 describe_range_error(errcode);
2931 return JNI_EINVAL;
2932 }
2933 set_min_heap_size((size_t)long_initial_heap_size);
2934 // Currently the minimum size and the initial heap sizes are the same.
2935 // Can be overridden with -XX:InitialHeapSize.
2936 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 // -Xmx
2940 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2941 julong long_max_heap_size = 0;
2942 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2943 if (errcode != arg_in_range) {
2944 jio_fprintf(defaultStream::error_stream(),
2945 "Invalid maximum heap size: %s\n", option->optionString);
2946 describe_range_error(errcode);
2947 return JNI_EINVAL;
2948 }
2949 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 // Xmaxf
2953 } else if (match_option(option, "-Xmaxf", &tail)) {
2954 char* err;
2955 int maxf = (int)(strtod(tail, &err) * 100);
2956 if (*err != '\0' || *tail == '\0') {
2957 jio_fprintf(defaultStream::error_stream(),
2958 "Bad max heap free percentage size: %s\n",
2959 option->optionString);
2960 return JNI_EINVAL;
2961 } else {
2962 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 }
2966 // Xminf
2967 } else if (match_option(option, "-Xminf", &tail)) {
2968 char* err;
2969 int minf = (int)(strtod(tail, &err) * 100);
2970 if (*err != '\0' || *tail == '\0') {
2971 jio_fprintf(defaultStream::error_stream(),
2972 "Bad min heap free percentage size: %s\n",
2973 option->optionString);
2974 return JNI_EINVAL;
2975 } else {
2976 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 }
2980 // -Xss
2981 } else if (match_option(option, "-Xss", &tail)) {
2982 julong long_ThreadStackSize = 0;
2983 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2984 if (errcode != arg_in_range) {
2985 jio_fprintf(defaultStream::error_stream(),
2986 "Invalid thread stack size: %s\n", option->optionString);
2987 describe_range_error(errcode);
2988 return JNI_EINVAL;
2989 }
2990 // Internally track ThreadStackSize in units of 1024 bytes.
2991 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2992 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2993 return JNI_EINVAL;
2994 }
2995 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2996 } else if (match_option(option, "-Xoss", &tail) ||
2997 match_option(option, "-Xsqnopause") ||
2998 match_option(option, "-Xoptimize") ||
2999 match_option(option, "-Xboundthreads") ||
3000 match_option(option, "-Xusealtsigs")) {
3001 // All these options are deprecated in JDK 9 and will be removed in a future release
3002 char version[256];
3003 JDK_Version::jdk(9).to_string(version, sizeof(version));
3004 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3005 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3006 julong long_CodeCacheExpansionSize = 0;
3007 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3008 if (errcode != arg_in_range) {
3009 jio_fprintf(defaultStream::error_stream(),
3010 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3011 os::vm_page_size()/K);
3012 return JNI_EINVAL;
3013 }
3014 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3015 return JNI_EINVAL;
3016 }
3017 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3018 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3019 julong long_ReservedCodeCacheSize = 0;
3020
3021 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3022 if (errcode != arg_in_range) {
3023 jio_fprintf(defaultStream::error_stream(),
3024 "Invalid maximum code cache size: %s.\n", option->optionString);
3025 return JNI_EINVAL;
3026 }
3027 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 // -XX:NonNMethodCodeHeapSize=
3031 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3032 julong long_NonNMethodCodeHeapSize = 0;
3033
3034 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3035 if (errcode != arg_in_range) {
3036 jio_fprintf(defaultStream::error_stream(),
3037 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3038 return JNI_EINVAL;
3039 }
3040 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 // -XX:ProfiledCodeHeapSize=
3044 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3045 julong long_ProfiledCodeHeapSize = 0;
3046
3047 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3048 if (errcode != arg_in_range) {
3049 jio_fprintf(defaultStream::error_stream(),
3050 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3051 return JNI_EINVAL;
3052 }
3053 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 // -XX:NonProfiledCodeHeapSizee=
3057 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3058 julong long_NonProfiledCodeHeapSize = 0;
3059
3060 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3061 if (errcode != arg_in_range) {
3062 jio_fprintf(defaultStream::error_stream(),
3063 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3064 return JNI_EINVAL;
3065 }
3066 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 // -green
3070 } else if (match_option(option, "-green")) {
3071 jio_fprintf(defaultStream::error_stream(),
3072 "Green threads support not available\n");
3073 return JNI_EINVAL;
3074 // -native
3075 } else if (match_option(option, "-native")) {
3076 // HotSpot always uses native threads, ignore silently for compatibility
3077 // -Xrs
3078 } else if (match_option(option, "-Xrs")) {
3079 // Classic/EVM option, new functionality
3080 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 // -Xprof
3084 } else if (match_option(option, "-Xprof")) {
3085 #if INCLUDE_FPROF
3086 _has_profile = true;
3087 #else // INCLUDE_FPROF
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Flat profiling is not supported in this VM.\n");
3090 return JNI_ERR;
3091 #endif // INCLUDE_FPROF
3092 // -Xconcurrentio
3093 } else if (match_option(option, "-Xconcurrentio")) {
3094 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3101 return JNI_EINVAL;
3102 }
3103 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3104 return JNI_EINVAL;
3105 }
3106 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3107 return JNI_EINVAL;
3108 }
3109
3110 // -Xinternalversion
3111 } else if (match_option(option, "-Xinternalversion")) {
3112 jio_fprintf(defaultStream::output_stream(), "%s\n",
3113 VM_Version::internal_vm_info_string());
3114 vm_exit(0);
3115 #ifndef PRODUCT
3116 // -Xprintflags
3117 } else if (match_option(option, "-Xprintflags")) {
3118 CommandLineFlags::printFlags(tty, false);
3119 vm_exit(0);
3120 #endif
3121 // -D
3122 } else if (match_option(option, "-D", &tail)) {
3123 const char* value;
3124 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3125 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3126 // abort if -Djava.endorsed.dirs is set
3127 jio_fprintf(defaultStream::output_stream(),
3128 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3129 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3130 return JNI_EINVAL;
3131 }
3132 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3133 *value != '\0' && strcmp(value, "\"\"") != 0) {
3134 // abort if -Djava.ext.dirs is set
3135 jio_fprintf(defaultStream::output_stream(),
3136 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3137 return JNI_EINVAL;
3138 }
3139 // Check for module related properties. They must be set using the modules
3140 // options. For example: use "--add-modules=java.sql", not
3141 // "-Djdk.module.addmods=java.sql"
3142 if (is_internal_module_property(option->optionString + 2)) {
3143 needs_module_property_warning = true;
3144 continue;
3145 }
3146
3147 if (!add_property(tail)) {
3148 return JNI_ENOMEM;
3149 }
3150 // Out of the box management support
3151 if (match_option(option, "-Dcom.sun.management", &tail)) {
3152 #if INCLUDE_MANAGEMENT
3153 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 // management agent in module java.management
3157 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3158 return JNI_ENOMEM;
3159 }
3160 #else
3161 jio_fprintf(defaultStream::output_stream(),
3162 "-Dcom.sun.management is not supported in this VM.\n");
3163 return JNI_ERR;
3164 #endif
3165 }
3166 // -Xint
3167 } else if (match_option(option, "-Xint")) {
3168 set_mode_flags(_int);
3169 // -Xmixed
3170 } else if (match_option(option, "-Xmixed")) {
3171 set_mode_flags(_mixed);
3172 // -Xcomp
3173 } else if (match_option(option, "-Xcomp")) {
3174 // for testing the compiler; turn off all flags that inhibit compilation
3175 set_mode_flags(_comp);
3176 // -Xshare:dump
3177 } else if (match_option(option, "-Xshare:dump")) {
3178 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3179 return JNI_EINVAL;
3180 }
3181 set_mode_flags(_int); // Prevent compilation, which creates objects
3182 // -Xshare:on
3183 } else if (match_option(option, "-Xshare:on")) {
3184 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3188 return JNI_EINVAL;
3189 }
3190 // -Xshare:auto
3191 } else if (match_option(option, "-Xshare:auto")) {
3192 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 // -Xshare:off
3199 } else if (match_option(option, "-Xshare:off")) {
3200 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 // -Xverify
3207 } else if (match_option(option, "-Xverify", &tail)) {
3208 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3209 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3210 return JNI_EINVAL;
3211 }
3212 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3213 return JNI_EINVAL;
3214 }
3215 } else if (strcmp(tail, ":remote") == 0) {
3216 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3217 return JNI_EINVAL;
3218 }
3219 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 } else if (strcmp(tail, ":none") == 0) {
3223 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3227 return JNI_EINVAL;
3228 }
3229 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3230 return JNI_EINVAL;
3231 }
3232 // -Xdebug
3233 } else if (match_option(option, "-Xdebug")) {
3234 // note this flag has been used, then ignore
3235 set_xdebug_mode(true);
3236 // -Xnoagent
3237 } else if (match_option(option, "-Xnoagent")) {
3238 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3239 } else if (match_option(option, "-Xloggc:", &tail)) {
3240 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3241 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3242 _gc_log_filename = os::strdup_check_oom(tail);
3243 } else if (match_option(option, "-Xlog", &tail)) {
3244 bool ret = false;
3245 if (strcmp(tail, ":help") == 0) {
3246 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3247 vm_exit(0);
3248 } else if (strcmp(tail, ":disable") == 0) {
3249 LogConfiguration::disable_logging();
3250 ret = true;
3251 } else if (*tail == '\0') {
3252 ret = LogConfiguration::parse_command_line_arguments();
3253 assert(ret, "-Xlog without arguments should never fail to parse");
3254 } else if (*tail == ':') {
3255 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3256 }
3257 if (ret == false) {
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Invalid -Xlog option '-Xlog%s'\n",
3260 tail);
3261 return JNI_EINVAL;
3262 }
3263 // JNI hooks
3264 } else if (match_option(option, "-Xcheck", &tail)) {
3265 if (!strcmp(tail, ":jni")) {
3266 #if !INCLUDE_JNI_CHECK
3267 warning("JNI CHECKING is not supported in this VM");
3268 #else
3269 CheckJNICalls = true;
3270 #endif // INCLUDE_JNI_CHECK
3271 } else if (is_bad_option(option, args->ignoreUnrecognized,
3272 "check")) {
3273 return JNI_EINVAL;
3274 }
3275 } else if (match_option(option, "vfprintf")) {
3276 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3277 } else if (match_option(option, "exit")) {
3278 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3279 } else if (match_option(option, "abort")) {
3280 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3281 // -XX:+AggressiveHeap
3282 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3283 jint result = set_aggressive_heap_flags();
3284 if (result != JNI_OK) {
3285 return result;
3286 }
3287 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3288 // and the last option wins.
3289 } else if (match_option(option, "-XX:+NeverTenure")) {
3290 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3294 return JNI_EINVAL;
3295 }
3296 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3297 return JNI_EINVAL;
3298 }
3299 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3300 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3310 uintx max_tenuring_thresh = 0;
3311 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3312 jio_fprintf(defaultStream::error_stream(),
3313 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3314 return JNI_EINVAL;
3315 }
3316
3317 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320
3321 if (MaxTenuringThreshold == 0) {
3322 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3326 return JNI_EINVAL;
3327 }
3328 } else {
3329 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3330 return JNI_EINVAL;
3331 }
3332 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 }
3336 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3337 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3338 return JNI_EINVAL;
3339 }
3340 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3341 return JNI_EINVAL;
3342 }
3343 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3344 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3345 return JNI_EINVAL;
3346 }
3347 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3348 return JNI_EINVAL;
3349 }
3350 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3351 #if defined(DTRACE_ENABLED)
3352 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3356 return JNI_EINVAL;
3357 }
3358 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3359 return JNI_EINVAL;
3360 }
3361 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3362 return JNI_EINVAL;
3363 }
3364 #else // defined(DTRACE_ENABLED)
3365 jio_fprintf(defaultStream::error_stream(),
3366 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3367 return JNI_EINVAL;
3368 #endif // defined(DTRACE_ENABLED)
3369 #ifdef ASSERT
3370 } else if (match_option(option, "-XX:+FullGCALot")) {
3371 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 // disable scavenge before parallel mark-compact
3375 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3376 return JNI_EINVAL;
3377 }
3378 #endif
3379 #if !INCLUDE_MANAGEMENT
3380 } else if (match_option(option, "-XX:+ManagementServer")) {
3381 jio_fprintf(defaultStream::error_stream(),
3382 "ManagementServer is not supported in this VM.\n");
3383 return JNI_ERR;
3384 #endif // INCLUDE_MANAGEMENT
3385 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3386 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3387 // already been handled
3388 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3389 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3390 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3391 return JNI_EINVAL;
3392 }
3393 }
3394 // Unknown option
3395 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3396 return JNI_ERR;
3397 }
3398 }
3399
3400 // PrintSharedArchiveAndExit will turn on
3401 // -Xshare:on
3402 // -Xlog:class+path=info
3403 if (PrintSharedArchiveAndExit) {
3404 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3408 return JNI_EINVAL;
3409 }
3410 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3411 }
3412
3413 // Change the default value for flags which have different default values
3414 // when working with older JDKs.
3415 #ifdef LINUX
3416 if (JDK_Version::current().compare_major(6) <= 0 &&
3417 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3418 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3419 }
3420 #endif // LINUX
3421 fix_appclasspath();
3422 return JNI_OK;
3423 }
3424
3425 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3426 // For java.base check for duplicate --patch-module options being specified on the command line.
3427 // This check is only required for java.base, all other duplicate module specifications
3428 // will be checked during module system initialization. The module system initialization
3429 // will throw an ExceptionInInitializerError if this situation occurs.
3430 if (strcmp(module_name, "java.base") == 0) {
3431 if (*patch_mod_javabase) {
3432 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3433 } else {
3434 *patch_mod_javabase = true;
3435 }
3436 }
3437
3438 // Create GrowableArray lazily, only if --patch-module has been specified
3439 if (_patch_mod_prefix == NULL) {
3440 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3441 }
3442
3443 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3444 }
3445
3446 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3447 //
3448 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3449 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3450 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3451 // path is treated as the current directory.
3452 //
3453 // This causes problems with CDS, which requires that all directories specified in the classpath
3454 // must be empty. In most cases, applications do NOT want to load classes from the current
3455 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3456 // scripts compatible with CDS.
3457 void Arguments::fix_appclasspath() {
3458 if (IgnoreEmptyClassPaths) {
3459 const char separator = *os::path_separator();
3460 const char* src = _java_class_path->value();
3461
3462 // skip over all the leading empty paths
3463 while (*src == separator) {
3464 src ++;
3465 }
3466
3467 char* copy = os::strdup_check_oom(src, mtArguments);
3468
3469 // trim all trailing empty paths
3470 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3471 *tail = '\0';
3472 }
3473
3474 char from[3] = {separator, separator, '\0'};
3475 char to [2] = {separator, '\0'};
3476 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3477 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3478 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3479 }
3480
3481 _java_class_path->set_writeable_value(copy);
3482 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3483 }
3484 }
3485
3486 static bool has_jar_files(const char* directory) {
3487 DIR* dir = os::opendir(directory);
3488 if (dir == NULL) return false;
3489
3490 struct dirent *entry;
3491 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3492 bool hasJarFile = false;
3493 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3494 const char* name = entry->d_name;
3495 const char* ext = name + strlen(name) - 4;
3496 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3497 }
3498 FREE_C_HEAP_ARRAY(char, dbuf);
3499 os::closedir(dir);
3500 return hasJarFile ;
3501 }
3502
3503 static int check_non_empty_dirs(const char* path) {
3504 const char separator = *os::path_separator();
3505 const char* const end = path + strlen(path);
3506 int nonEmptyDirs = 0;
3507 while (path < end) {
3508 const char* tmp_end = strchr(path, separator);
3509 if (tmp_end == NULL) {
3510 if (has_jar_files(path)) {
3511 nonEmptyDirs++;
3512 jio_fprintf(defaultStream::output_stream(),
3513 "Non-empty directory: %s\n", path);
3514 }
3515 path = end;
3516 } else {
3517 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3518 memcpy(dirpath, path, tmp_end - path);
3519 dirpath[tmp_end - path] = '\0';
3520 if (has_jar_files(dirpath)) {
3521 nonEmptyDirs++;
3522 jio_fprintf(defaultStream::output_stream(),
3523 "Non-empty directory: %s\n", dirpath);
3524 }
3525 FREE_C_HEAP_ARRAY(char, dirpath);
3526 path = tmp_end + 1;
3527 }
3528 }
3529 return nonEmptyDirs;
3530 }
3531
3532 jint Arguments::finalize_vm_init_args() {
3533 // check if the default lib/endorsed directory exists; if so, error
3534 char path[JVM_MAXPATHLEN];
3535 const char* fileSep = os::file_separator();
3536 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3537
3538 if (CheckEndorsedAndExtDirs) {
3539 int nonEmptyDirs = 0;
3540 // check endorsed directory
3541 nonEmptyDirs += check_non_empty_dirs(path);
3542 // check the extension directories
3543 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3544 if (nonEmptyDirs > 0) {
3545 return JNI_ERR;
3546 }
3547 }
3548
3549 DIR* dir = os::opendir(path);
3550 if (dir != NULL) {
3551 jio_fprintf(defaultStream::output_stream(),
3552 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3553 "in modular form will be supported via the concept of upgradeable modules.\n");
3554 os::closedir(dir);
3555 return JNI_ERR;
3556 }
3557
3558 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3559 dir = os::opendir(path);
3560 if (dir != NULL) {
3561 jio_fprintf(defaultStream::output_stream(),
3562 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3563 "Use -classpath instead.\n.");
3564 os::closedir(dir);
3565 return JNI_ERR;
3566 }
3567
3568 // This must be done after all arguments have been processed.
3569 // java_compiler() true means set to "NONE" or empty.
3570 if (java_compiler() && !xdebug_mode()) {
3571 // For backwards compatibility, we switch to interpreted mode if
3572 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3573 // not specified.
3574 set_mode_flags(_int);
3575 }
3576
3577 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3578 // but like -Xint, leave compilation thresholds unaffected.
3579 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3580 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3581 set_mode_flags(_int);
3582 }
3583
3584 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3585 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3586 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3587 }
3588
3589 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3590 // Don't degrade server performance for footprint
3591 if (FLAG_IS_DEFAULT(UseLargePages) &&
3592 MaxHeapSize < LargePageHeapSizeThreshold) {
3593 // No need for large granularity pages w/small heaps.
3594 // Note that large pages are enabled/disabled for both the
3595 // Java heap and the code cache.
3596 FLAG_SET_DEFAULT(UseLargePages, false);
3597 }
3598
3599 #elif defined(COMPILER2)
3600 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3601 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3602 }
3603 #endif
3604
3605 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3606 UNSUPPORTED_OPTION(ProfileInterpreter);
3607 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3608 #endif
3609
3610 #ifndef TIERED
3611 // Tiered compilation is undefined.
3612 UNSUPPORTED_OPTION(TieredCompilation);
3613 #endif
3614
3615 #if INCLUDE_JVMCI
3616 if (EnableJVMCI &&
3617 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3618 return JNI_ENOMEM;
3619 }
3620 #endif
3621
3622 // If we are running in a headless jre, force java.awt.headless property
3623 // to be true unless the property has already been set.
3624 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3625 if (os::is_headless_jre()) {
3626 const char* headless = Arguments::get_property("java.awt.headless");
3627 if (headless == NULL) {
3628 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3629 if (headless_env == NULL) {
3630 if (!add_property("java.awt.headless=true")) {
3631 return JNI_ENOMEM;
3632 }
3633 } else {
3634 char buffer[256];
3635 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3636 if (!add_property(buffer)) {
3637 return JNI_ENOMEM;
3638 }
3639 }
3640 }
3641 }
3642
3643 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3644 // CMS can only be used with ParNew
3645 FLAG_SET_ERGO(bool, UseParNewGC, true);
3646 }
3647
3648 if (!check_vm_args_consistency()) {
3649 return JNI_ERR;
3650 }
3651
3652 return JNI_OK;
3653 }
3654
3655 // Helper class for controlling the lifetime of JavaVMInitArgs
3656 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3657 // deleted on the destruction of the ScopedVMInitArgs object.
3658 class ScopedVMInitArgs : public StackObj {
3659 private:
3660 JavaVMInitArgs _args;
3661 char* _container_name;
3662 bool _is_set;
3663 char* _vm_options_file_arg;
3664
3665 public:
3666 ScopedVMInitArgs(const char *container_name) {
3667 _args.version = JNI_VERSION_1_2;
3668 _args.nOptions = 0;
3669 _args.options = NULL;
3670 _args.ignoreUnrecognized = false;
3671 _container_name = (char *)container_name;
3672 _is_set = false;
3673 _vm_options_file_arg = NULL;
3674 }
3675
3676 // Populates the JavaVMInitArgs object represented by this
3677 // ScopedVMInitArgs object with the arguments in options. The
3678 // allocated memory is deleted by the destructor. If this method
3679 // returns anything other than JNI_OK, then this object is in a
3680 // partially constructed state, and should be abandoned.
3681 jint set_args(GrowableArray<JavaVMOption>* options) {
3682 _is_set = true;
3683 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3684 JavaVMOption, options->length(), mtArguments);
3685 if (options_arr == NULL) {
3686 return JNI_ENOMEM;
3687 }
3688 _args.options = options_arr;
3689
3690 for (int i = 0; i < options->length(); i++) {
3691 options_arr[i] = options->at(i);
3692 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3693 if (options_arr[i].optionString == NULL) {
3694 // Rely on the destructor to do cleanup.
3695 _args.nOptions = i;
3696 return JNI_ENOMEM;
3697 }
3698 }
3699
3700 _args.nOptions = options->length();
3701 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3702 return JNI_OK;
3703 }
3704
3705 JavaVMInitArgs* get() { return &_args; }
3706 char* container_name() { return _container_name; }
3707 bool is_set() { return _is_set; }
3708 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3709 char* vm_options_file_arg() { return _vm_options_file_arg; }
3710
3711 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3712 if (_vm_options_file_arg != NULL) {
3713 os::free(_vm_options_file_arg);
3714 }
3715 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3716 }
3717
3718 ~ScopedVMInitArgs() {
3719 if (_vm_options_file_arg != NULL) {
3720 os::free(_vm_options_file_arg);
3721 }
3722 if (_args.options == NULL) return;
3723 for (int i = 0; i < _args.nOptions; i++) {
3724 os::free(_args.options[i].optionString);
3725 }
3726 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3727 }
3728
3729 // Insert options into this option list, to replace option at
3730 // vm_options_file_pos (-XX:VMOptionsFile)
3731 jint insert(const JavaVMInitArgs* args,
3732 const JavaVMInitArgs* args_to_insert,
3733 const int vm_options_file_pos) {
3734 assert(_args.options == NULL, "shouldn't be set yet");
3735 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3736 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3737
3738 int length = args->nOptions + args_to_insert->nOptions - 1;
3739 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3740 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3741 for (int i = 0; i < args->nOptions; i++) {
3742 if (i == vm_options_file_pos) {
3743 // insert the new options starting at the same place as the
3744 // -XX:VMOptionsFile option
3745 for (int j = 0; j < args_to_insert->nOptions; j++) {
3746 options->push(args_to_insert->options[j]);
3747 }
3748 } else {
3749 options->push(args->options[i]);
3750 }
3751 }
3752 // make into options array
3753 jint result = set_args(options);
3754 delete options;
3755 return result;
3756 }
3757 };
3758
3759 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3760 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3761 }
3762
3763 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3764 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3765 }
3766
3767 jint Arguments::parse_options_environment_variable(const char* name,
3768 ScopedVMInitArgs* vm_args) {
3769 char *buffer = ::getenv(name);
3770
3771 // Don't check this environment variable if user has special privileges
3772 // (e.g. unix su command).
3773 if (buffer == NULL || os::have_special_privileges()) {
3774 return JNI_OK;
3775 }
3776
3777 if ((buffer = os::strdup(buffer)) == NULL) {
3778 return JNI_ENOMEM;
3779 }
3780
3781 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3782
3783 os::free(buffer);
3784 return retcode;
3785 }
3786
3787 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3788 // read file into buffer
3789 int fd = ::open(file_name, O_RDONLY);
3790 if (fd < 0) {
3791 jio_fprintf(defaultStream::error_stream(),
3792 "Could not open options file '%s'\n",
3793 file_name);
3794 return JNI_ERR;
3795 }
3796
3797 struct stat stbuf;
3798 int retcode = os::stat(file_name, &stbuf);
3799 if (retcode != 0) {
3800 jio_fprintf(defaultStream::error_stream(),
3801 "Could not stat options file '%s'\n",
3802 file_name);
3803 os::close(fd);
3804 return JNI_ERR;
3805 }
3806
3807 if (stbuf.st_size == 0) {
3808 // tell caller there is no option data and that is ok
3809 os::close(fd);
3810 return JNI_OK;
3811 }
3812
3813 // '+ 1' for NULL termination even with max bytes
3814 size_t bytes_alloc = stbuf.st_size + 1;
3815
3816 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3817 if (NULL == buf) {
3818 jio_fprintf(defaultStream::error_stream(),
3819 "Could not allocate read buffer for options file parse\n");
3820 os::close(fd);
3821 return JNI_ENOMEM;
3822 }
3823
3824 memset(buf, 0, bytes_alloc);
3825
3826 // Fill buffer
3827 // Use ::read() instead of os::read because os::read()
3828 // might do a thread state transition
3829 // and it is too early for that here
3830
3831 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3832 os::close(fd);
3833 if (bytes_read < 0) {
3834 FREE_C_HEAP_ARRAY(char, buf);
3835 jio_fprintf(defaultStream::error_stream(),
3836 "Could not read options file '%s'\n", file_name);
3837 return JNI_ERR;
3838 }
3839
3840 if (bytes_read == 0) {
3841 // tell caller there is no option data and that is ok
3842 FREE_C_HEAP_ARRAY(char, buf);
3843 return JNI_OK;
3844 }
3845
3846 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3847
3848 FREE_C_HEAP_ARRAY(char, buf);
3849 return retcode;
3850 }
3851
3852 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3853 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3854
3855 // some pointers to help with parsing
3856 char *buffer_end = buffer + buf_len;
3857 char *opt_hd = buffer;
3858 char *wrt = buffer;
3859 char *rd = buffer;
3860
3861 // parse all options
3862 while (rd < buffer_end) {
3863 // skip leading white space from the input string
3864 while (rd < buffer_end && isspace(*rd)) {
3865 rd++;
3866 }
3867
3868 if (rd >= buffer_end) {
3869 break;
3870 }
3871
3872 // Remember this is where we found the head of the token.
3873 opt_hd = wrt;
3874
3875 // Tokens are strings of non white space characters separated
3876 // by one or more white spaces.
3877 while (rd < buffer_end && !isspace(*rd)) {
3878 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3879 int quote = *rd; // matching quote to look for
3880 rd++; // don't copy open quote
3881 while (rd < buffer_end && *rd != quote) {
3882 // include everything (even spaces)
3883 // up until the close quote
3884 *wrt++ = *rd++; // copy to option string
3885 }
3886
3887 if (rd < buffer_end) {
3888 rd++; // don't copy close quote
3889 } else {
3890 // did not see closing quote
3891 jio_fprintf(defaultStream::error_stream(),
3892 "Unmatched quote in %s\n", name);
3893 delete options;
3894 return JNI_ERR;
3895 }
3896 } else {
3897 *wrt++ = *rd++; // copy to option string
3898 }
3899 }
3900
3901 // steal a white space character and set it to NULL
3902 *wrt++ = '\0';
3903 // We now have a complete token
3904
3905 JavaVMOption option;
3906 option.optionString = opt_hd;
3907 option.extraInfo = NULL;
3908
3909 options->append(option); // Fill in option
3910
3911 rd++; // Advance to next character
3912 }
3913
3914 // Fill out JavaVMInitArgs structure.
3915 jint status = vm_args->set_args(options);
3916
3917 delete options;
3918 return status;
3919 }
3920
3921 void Arguments::set_shared_spaces_flags() {
3922 if (DumpSharedSpaces) {
3923 if (FailOverToOldVerifier) {
3924 // Don't fall back to the old verifier on verification failure. If a
3925 // class fails verification with the split verifier, it might fail the
3926 // CDS runtime verifier constraint check. In that case, we don't want
3927 // to share the class. We only archive classes that pass the split verifier.
3928 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3929 }
3930
3931 if (RequireSharedSpaces) {
3932 warning("Cannot dump shared archive while using shared archive");
3933 }
3934 UseSharedSpaces = false;
3935 #ifdef _LP64
3936 if (!UseCompressedOops || !UseCompressedClassPointers) {
3937 vm_exit_during_initialization(
3938 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3939 }
3940 } else {
3941 if (!UseCompressedOops || !UseCompressedClassPointers) {
3942 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3943 }
3944 #endif
3945 }
3946 }
3947
3948 // Sharing support
3949 // Construct the path to the archive
3950 static char* get_shared_archive_path() {
3951 char *shared_archive_path;
3952 if (SharedArchiveFile == NULL) {
3953 char jvm_path[JVM_MAXPATHLEN];
3954 os::jvm_path(jvm_path, sizeof(jvm_path));
3955 char *end = strrchr(jvm_path, *os::file_separator());
3956 if (end != NULL) *end = '\0';
3957 size_t jvm_path_len = strlen(jvm_path);
3958 size_t file_sep_len = strlen(os::file_separator());
3959 const size_t len = jvm_path_len + file_sep_len + 20;
3960 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3961 if (shared_archive_path != NULL) {
3962 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3963 jvm_path, os::file_separator());
3964 }
3965 } else {
3966 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3967 }
3968 return shared_archive_path;
3969 }
3970
3971 #ifndef PRODUCT
3972 // Determine whether LogVMOutput should be implicitly turned on.
3973 static bool use_vm_log() {
3974 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3975 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3976 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3977 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3978 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3979 return true;
3980 }
3981
3982 #ifdef COMPILER1
3983 if (PrintC1Statistics) {
3984 return true;
3985 }
3986 #endif // COMPILER1
3987
3988 #ifdef COMPILER2
3989 if (PrintOptoAssembly || PrintOptoStatistics) {
3990 return true;
3991 }
3992 #endif // COMPILER2
3993
3994 return false;
3995 }
3996
3997 #endif // PRODUCT
3998
3999 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4000 for (int index = 0; index < args->nOptions; index++) {
4001 const JavaVMOption* option = args->options + index;
4002 const char* tail;
4003 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4004 return true;
4005 }
4006 }
4007 return false;
4008 }
4009
4010 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4011 const char* vm_options_file,
4012 const int vm_options_file_pos,
4013 ScopedVMInitArgs* vm_options_file_args,
4014 ScopedVMInitArgs* args_out) {
4015 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4016 if (code != JNI_OK) {
4017 return code;
4018 }
4019
4020 if (vm_options_file_args->get()->nOptions < 1) {
4021 return JNI_OK;
4022 }
4023
4024 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4025 jio_fprintf(defaultStream::error_stream(),
4026 "A VM options file may not refer to a VM options file. "
4027 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4028 "options file '%s' in options container '%s' is an error.\n",
4029 vm_options_file_args->vm_options_file_arg(),
4030 vm_options_file_args->container_name());
4031 return JNI_EINVAL;
4032 }
4033
4034 return args_out->insert(args, vm_options_file_args->get(),
4035 vm_options_file_pos);
4036 }
4037
4038 // Expand -XX:VMOptionsFile found in args_in as needed.
4039 // mod_args and args_out parameters may return values as needed.
4040 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4041 ScopedVMInitArgs* mod_args,
4042 JavaVMInitArgs** args_out) {
4043 jint code = match_special_option_and_act(args_in, mod_args);
4044 if (code != JNI_OK) {
4045 return code;
4046 }
4047
4048 if (mod_args->is_set()) {
4049 // args_in contains -XX:VMOptionsFile and mod_args contains the
4050 // original options from args_in along with the options expanded
4051 // from the VMOptionsFile. Return a short-hand to the caller.
4052 *args_out = mod_args->get();
4053 } else {
4054 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4055 }
4056 return JNI_OK;
4057 }
4058
4059 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4060 ScopedVMInitArgs* args_out) {
4061 // Remaining part of option string
4062 const char* tail;
4063 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4064
4065 for (int index = 0; index < args->nOptions; index++) {
4066 const JavaVMOption* option = args->options + index;
4067 if (ArgumentsExt::process_options(option)) {
4068 continue;
4069 }
4070 if (match_option(option, "-XX:Flags=", &tail)) {
4071 Arguments::set_jvm_flags_file(tail);
4072 continue;
4073 }
4074 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4075 if (vm_options_file_args.found_vm_options_file_arg()) {
4076 jio_fprintf(defaultStream::error_stream(),
4077 "The option '%s' is already specified in the options "
4078 "container '%s' so the specification of '%s' in the "
4079 "same options container is an error.\n",
4080 vm_options_file_args.vm_options_file_arg(),
4081 vm_options_file_args.container_name(),
4082 option->optionString);
4083 return JNI_EINVAL;
4084 }
4085 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4086 // If there's a VMOptionsFile, parse that
4087 jint code = insert_vm_options_file(args, tail, index,
4088 &vm_options_file_args, args_out);
4089 if (code != JNI_OK) {
4090 return code;
4091 }
4092 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4093 if (args_out->is_set()) {
4094 // The VMOptions file inserted some options so switch 'args'
4095 // to the new set of options, and continue processing which
4096 // preserves "last option wins" semantics.
4097 args = args_out->get();
4098 // The first option from the VMOptionsFile replaces the
4099 // current option. So we back track to process the
4100 // replacement option.
4101 index--;
4102 }
4103 continue;
4104 }
4105 if (match_option(option, "-XX:+PrintVMOptions")) {
4106 PrintVMOptions = true;
4107 continue;
4108 }
4109 if (match_option(option, "-XX:-PrintVMOptions")) {
4110 PrintVMOptions = false;
4111 continue;
4112 }
4113 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4114 IgnoreUnrecognizedVMOptions = true;
4115 continue;
4116 }
4117 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4118 IgnoreUnrecognizedVMOptions = false;
4119 continue;
4120 }
4121 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4122 CommandLineFlags::printFlags(tty, false);
4123 vm_exit(0);
4124 }
4125 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4126 #if INCLUDE_NMT
4127 // The launcher did not setup nmt environment variable properly.
4128 if (!MemTracker::check_launcher_nmt_support(tail)) {
4129 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4130 }
4131
4132 // Verify if nmt option is valid.
4133 if (MemTracker::verify_nmt_option()) {
4134 // Late initialization, still in single-threaded mode.
4135 if (MemTracker::tracking_level() >= NMT_summary) {
4136 MemTracker::init();
4137 }
4138 } else {
4139 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4140 }
4141 continue;
4142 #else
4143 jio_fprintf(defaultStream::error_stream(),
4144 "Native Memory Tracking is not supported in this VM\n");
4145 return JNI_ERR;
4146 #endif
4147 }
4148
4149 #ifndef PRODUCT
4150 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4151 CommandLineFlags::printFlags(tty, true);
4152 vm_exit(0);
4153 }
4154 #endif
4155 }
4156 return JNI_OK;
4157 }
4158
4159 static void print_options(const JavaVMInitArgs *args) {
4160 const char* tail;
4161 for (int index = 0; index < args->nOptions; index++) {
4162 const JavaVMOption *option = args->options + index;
4163 if (match_option(option, "-XX:", &tail)) {
4164 logOption(tail);
4165 }
4166 }
4167 }
4168
4169 bool Arguments::handle_deprecated_print_gc_flags() {
4170 if (PrintGC) {
4171 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4172 }
4173 if (PrintGCDetails) {
4174 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4175 }
4176
4177 if (_gc_log_filename != NULL) {
4178 // -Xloggc was used to specify a filename
4179 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4180
4181 LogTarget(Error, logging) target;
4182 LogStreamCHeap errstream(target);
4183 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4184 } else if (PrintGC || PrintGCDetails) {
4185 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4186 }
4187 return true;
4188 }
4189
4190 void Arguments::handle_extra_cms_flags(const char* msg) {
4191 SpecialFlag flag;
4192 const char *flag_name = "UseConcMarkSweepGC";
4193 if (lookup_special_flag(flag_name, flag)) {
4194 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4195 warning("%s", msg);
4196 }
4197 }
4198
4199 // Parse entry point called from JNI_CreateJavaVM
4200
4201 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4202 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4203
4204 // Initialize ranges, constraints and writeables
4205 CommandLineFlagRangeList::init();
4206 CommandLineFlagConstraintList::init();
4207 CommandLineFlagWriteableList::init();
4208
4209 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4210 const char* hotspotrc = ".hotspotrc";
4211 bool settings_file_specified = false;
4212 bool needs_hotspotrc_warning = false;
4213 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4214 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4215
4216 // Pointers to current working set of containers
4217 JavaVMInitArgs* cur_cmd_args;
4218 JavaVMInitArgs* cur_java_options_args;
4219 JavaVMInitArgs* cur_java_tool_options_args;
4220
4221 // Containers for modified/expanded options
4222 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4223 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4224 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4225
4226
4227 jint code =
4228 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4229 if (code != JNI_OK) {
4230 return code;
4231 }
4232
4233 code = parse_java_options_environment_variable(&initial_java_options_args);
4234 if (code != JNI_OK) {
4235 return code;
4236 }
4237
4238 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4239 &mod_java_tool_options_args,
4240 &cur_java_tool_options_args);
4241 if (code != JNI_OK) {
4242 return code;
4243 }
4244
4245 code = expand_vm_options_as_needed(initial_cmd_args,
4246 &mod_cmd_args,
4247 &cur_cmd_args);
4248 if (code != JNI_OK) {
4249 return code;
4250 }
4251
4252 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4253 &mod_java_options_args,
4254 &cur_java_options_args);
4255 if (code != JNI_OK) {
4256 return code;
4257 }
4258
4259 const char* flags_file = Arguments::get_jvm_flags_file();
4260 settings_file_specified = (flags_file != NULL);
4261
4262 if (IgnoreUnrecognizedVMOptions) {
4263 cur_cmd_args->ignoreUnrecognized = true;
4264 cur_java_tool_options_args->ignoreUnrecognized = true;
4265 cur_java_options_args->ignoreUnrecognized = true;
4266 }
4267
4268 // Parse specified settings file
4269 if (settings_file_specified) {
4270 if (!process_settings_file(flags_file, true,
4271 cur_cmd_args->ignoreUnrecognized)) {
4272 return JNI_EINVAL;
4273 }
4274 } else {
4275 #ifdef ASSERT
4276 // Parse default .hotspotrc settings file
4277 if (!process_settings_file(".hotspotrc", false,
4278 cur_cmd_args->ignoreUnrecognized)) {
4279 return JNI_EINVAL;
4280 }
4281 #else
4282 struct stat buf;
4283 if (os::stat(hotspotrc, &buf) == 0) {
4284 needs_hotspotrc_warning = true;
4285 }
4286 #endif
4287 }
4288
4289 if (PrintVMOptions) {
4290 print_options(cur_java_tool_options_args);
4291 print_options(cur_cmd_args);
4292 print_options(cur_java_options_args);
4293 }
4294
4295 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4296 jint result = parse_vm_init_args(cur_java_tool_options_args,
4297 cur_java_options_args,
4298 cur_cmd_args);
4299
4300 if (result != JNI_OK) {
4301 return result;
4302 }
4303
4304 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4305 SharedArchivePath = get_shared_archive_path();
4306 if (SharedArchivePath == NULL) {
4307 return JNI_ENOMEM;
4308 }
4309
4310 // Set up VerifySharedSpaces
4311 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4312 VerifySharedSpaces = true;
4313 }
4314
4315 // Delay warning until here so that we've had a chance to process
4316 // the -XX:-PrintWarnings flag
4317 if (needs_hotspotrc_warning) {
4318 warning("%s file is present but has been ignored. "
4319 "Run with -XX:Flags=%s to load the file.",
4320 hotspotrc, hotspotrc);
4321 }
4322
4323 if (needs_module_property_warning) {
4324 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4325 " names that are reserved for internal use.");
4326 }
4327
4328 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4329 UNSUPPORTED_OPTION(UseLargePages);
4330 #endif
4331
4332 ArgumentsExt::report_unsupported_options();
4333
4334 #ifndef PRODUCT
4335 if (TraceBytecodesAt != 0) {
4336 TraceBytecodes = true;
4337 }
4338 if (CountCompiledCalls) {
4339 if (UseCounterDecay) {
4340 warning("UseCounterDecay disabled because CountCalls is set");
4341 UseCounterDecay = false;
4342 }
4343 }
4344 #endif // PRODUCT
4345
4346 if (ScavengeRootsInCode == 0) {
4347 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4348 warning("Forcing ScavengeRootsInCode non-zero");
4349 }
4350 ScavengeRootsInCode = 1;
4351 }
4352
4353 if (!handle_deprecated_print_gc_flags()) {
4354 return JNI_EINVAL;
4355 }
4356
4357 // Set object alignment values.
4358 set_object_alignment();
4359
4360 #if !INCLUDE_CDS
4361 if (DumpSharedSpaces || RequireSharedSpaces) {
4362 jio_fprintf(defaultStream::error_stream(),
4363 "Shared spaces are not supported in this VM\n");
4364 return JNI_ERR;
4365 }
4366 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4367 warning("Shared spaces are not supported in this VM");
4368 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4369 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4370 }
4371 no_shared_spaces("CDS Disabled");
4372 #endif // INCLUDE_CDS
4373
4374 return JNI_OK;
4375 }
4376
4377 jint Arguments::apply_ergo() {
4378
4379 // Set flags based on ergonomics.
4380 set_ergonomics_flags();
4381
4382 set_shared_spaces_flags();
4383
4384 // Check the GC selections again.
4385 if (!check_gc_consistency()) {
4386 return JNI_EINVAL;
4387 }
4388
4389 if (TieredCompilation) {
4390 set_tiered_flags();
4391 } else {
4392 int max_compilation_policy_choice = 1;
4393 #ifdef COMPILER2
4394 max_compilation_policy_choice = 2;
4395 #endif
4396 // Check if the policy is valid.
4397 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4398 vm_exit_during_initialization(
4399 "Incompatible compilation policy selected", NULL);
4400 }
4401 // Scale CompileThreshold
4402 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4403 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4404 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4405 }
4406 }
4407
4408 #ifdef COMPILER2
4409 #ifndef PRODUCT
4410 if (PrintIdealGraphLevel > 0) {
4411 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4412 }
4413 #endif
4414 #endif
4415
4416 // Set heap size based on available physical memory
4417 set_heap_size();
4418
4419 ArgumentsExt::set_gc_specific_flags();
4420
4421 // Initialize Metaspace flags and alignments
4422 Metaspace::ergo_initialize();
4423
4424 // Set bytecode rewriting flags
4425 set_bytecode_flags();
4426
4427 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4428 jint code = set_aggressive_opts_flags();
4429 if (code != JNI_OK) {
4430 return code;
4431 }
4432
4433 // Turn off biased locking for locking debug mode flags,
4434 // which are subtly different from each other but neither works with
4435 // biased locking
4436 if (UseHeavyMonitors
4437 #ifdef COMPILER1
4438 || !UseFastLocking
4439 #endif // COMPILER1
4440 #if INCLUDE_JVMCI
4441 || !JVMCIUseFastLocking
4442 #endif
4443 ) {
4444 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4445 // flag set to true on command line; warn the user that they
4446 // can't enable biased locking here
4447 warning("Biased Locking is not supported with locking debug flags"
4448 "; ignoring UseBiasedLocking flag." );
4449 }
4450 UseBiasedLocking = false;
4451 }
4452
4453 #ifdef CC_INTERP
4454 // Clear flags not supported on zero.
4455 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4456 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4457 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4458 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4459 #endif // CC_INTERP
4460
4461 #ifdef COMPILER2
4462 if (!EliminateLocks) {
4463 EliminateNestedLocks = false;
4464 }
4465 if (!Inline) {
4466 IncrementalInline = false;
4467 }
4468 #ifndef PRODUCT
4469 if (!IncrementalInline) {
4470 AlwaysIncrementalInline = false;
4471 }
4472 #endif
4473 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4474 // nothing to use the profiling, turn if off
4475 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4476 }
4477 #endif
4478
4479 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4480 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4481 DebugNonSafepoints = true;
4482 }
4483
4484 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4485 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4486 }
4487
4488 if (UseOnStackReplacement && !UseLoopCounter) {
4489 warning("On-stack-replacement requires loop counters; enabling loop counters");
4490 FLAG_SET_DEFAULT(UseLoopCounter, true);
4491 }
4492
4493 #ifndef PRODUCT
4494 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4495 if (use_vm_log()) {
4496 LogVMOutput = true;
4497 }
4498 }
4499 #endif // PRODUCT
4500
4501 if (PrintCommandLineFlags) {
4502 CommandLineFlags::printSetFlags(tty);
4503 }
4504
4505 // Apply CPU specific policy for the BiasedLocking
4506 if (UseBiasedLocking) {
4507 if (!VM_Version::use_biased_locking() &&
4508 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4509 UseBiasedLocking = false;
4510 }
4511 }
4512 #ifdef COMPILER2
4513 if (!UseBiasedLocking || EmitSync != 0) {
4514 UseOptoBiasInlining = false;
4515 }
4516 #endif
4517
4518 return JNI_OK;
4519 }
4520
4521 jint Arguments::adjust_after_os() {
4522 if (UseNUMA) {
4523 if (UseParallelGC || UseParallelOldGC) {
4524 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4525 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4526 }
4527 }
4528 // UseNUMAInterleaving is set to ON for all collectors and
4529 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4530 // such as the parallel collector for Linux and Solaris will
4531 // interleave old gen and survivor spaces on top of NUMA
4532 // allocation policy for the eden space.
4533 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4534 // all platforms and ParallelGC on Windows will interleave all
4535 // of the heap spaces across NUMA nodes.
4536 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4537 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4538 }
4539 }
4540 return JNI_OK;
4541 }
4542
4543 int Arguments::PropertyList_count(SystemProperty* pl) {
4544 int count = 0;
4545 while(pl != NULL) {
4546 count++;
4547 pl = pl->next();
4548 }
4549 return count;
4550 }
4551
4552 // Return the number of readable properties.
4553 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4554 int count = 0;
4555 while(pl != NULL) {
4556 if (pl->is_readable()) {
4557 count++;
4558 }
4559 pl = pl->next();
4560 }
4561 return count;
4562 }
4563
4564 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4565 assert(key != NULL, "just checking");
4566 SystemProperty* prop;
4567 for (prop = pl; prop != NULL; prop = prop->next()) {
4568 if (strcmp(key, prop->key()) == 0) return prop->value();
4569 }
4570 return NULL;
4571 }
4572
4573 // Return the value of the requested property provided that it is a readable property.
4574 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4575 assert(key != NULL, "just checking");
4576 SystemProperty* prop;
4577 // Return the property value if the keys match and the property is not internal or
4578 // it's the special internal property "jdk.boot.class.path.append".
4579 for (prop = pl; prop != NULL; prop = prop->next()) {
4580 if (strcmp(key, prop->key()) == 0) {
4581 if (!prop->internal()) {
4582 return prop->value();
4583 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4584 return prop->value();
4585 } else {
4586 // Property is internal and not jdk.boot.class.path.append so return NULL.
4587 return NULL;
4588 }
4589 }
4590 }
4591 return NULL;
4592 }
4593
4594 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4595 int count = 0;
4596 const char* ret_val = NULL;
4597
4598 while(pl != NULL) {
4599 if(count >= index) {
4600 ret_val = pl->key();
4601 break;
4602 }
4603 count++;
4604 pl = pl->next();
4605 }
4606
4607 return ret_val;
4608 }
4609
4610 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4611 int count = 0;
4612 char* ret_val = NULL;
4613
4614 while(pl != NULL) {
4615 if(count >= index) {
4616 ret_val = pl->value();
4617 break;
4618 }
4619 count++;
4620 pl = pl->next();
4621 }
4622
4623 return ret_val;
4624 }
4625
4626 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4627 SystemProperty* p = *plist;
4628 if (p == NULL) {
4629 *plist = new_p;
4630 } else {
4631 while (p->next() != NULL) {
4632 p = p->next();
4633 }
4634 p->set_next(new_p);
4635 }
4636 }
4637
4638 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4639 bool writeable, bool internal) {
4640 if (plist == NULL)
4641 return;
4642
4643 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4644 PropertyList_add(plist, new_p);
4645 }
4646
4647 void Arguments::PropertyList_add(SystemProperty *element) {
4648 PropertyList_add(&_system_properties, element);
4649 }
4650
4651 // This add maintains unique property key in the list.
4652 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4653 PropertyAppendable append, PropertyWriteable writeable,
4654 PropertyInternal internal) {
4655 if (plist == NULL)
4656 return;
4657
4658 // If property key exist then update with new value.
4659 SystemProperty* prop;
4660 for (prop = *plist; prop != NULL; prop = prop->next()) {
4661 if (strcmp(k, prop->key()) == 0) {
4662 if (append == AppendProperty) {
4663 prop->append_value(v);
4664 } else {
4665 prop->set_value(v);
4666 }
4667 return;
4668 }
4669 }
4670
4671 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4672 }
4673
4674 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4675 // Returns true if all of the source pointed by src has been copied over to
4676 // the destination buffer pointed by buf. Otherwise, returns false.
4677 // Notes:
4678 // 1. If the length (buflen) of the destination buffer excluding the
4679 // NULL terminator character is not long enough for holding the expanded
4680 // pid characters, it also returns false instead of returning the partially
4681 // expanded one.
4682 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4683 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4684 char* buf, size_t buflen) {
4685 const char* p = src;
4686 char* b = buf;
4687 const char* src_end = &src[srclen];
4688 char* buf_end = &buf[buflen - 1];
4689
4690 while (p < src_end && b < buf_end) {
4691 if (*p == '%') {
4692 switch (*(++p)) {
4693 case '%': // "%%" ==> "%"
4694 *b++ = *p++;
4695 break;
4696 case 'p': { // "%p" ==> current process id
4697 // buf_end points to the character before the last character so
4698 // that we could write '\0' to the end of the buffer.
4699 size_t buf_sz = buf_end - b + 1;
4700 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4701
4702 // if jio_snprintf fails or the buffer is not long enough to hold
4703 // the expanded pid, returns false.
4704 if (ret < 0 || ret >= (int)buf_sz) {
4705 return false;
4706 } else {
4707 b += ret;
4708 assert(*b == '\0', "fail in copy_expand_pid");
4709 if (p == src_end && b == buf_end + 1) {
4710 // reach the end of the buffer.
4711 return true;
4712 }
4713 }
4714 p++;
4715 break;
4716 }
4717 default :
4718 *b++ = '%';
4719 }
4720 } else {
4721 *b++ = *p++;
4722 }
4723 }
4724 *b = '\0';
4725 return (p == src_end); // return false if not all of the source was copied
4726 }