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