1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "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 ADDOPENS "addopens"
174 #define ADDOPENS_LEN 8
175 #define PATCH "patch"
176 #define PATCH_LEN 5
177 #define ADDMODS "addmods"
178 #define ADDMODS_LEN 7
179 #define LIMITMODS "limitmods"
180 #define LIMITMODS_LEN 9
181 #define PATH "path"
182 #define PATH_LEN 4
183 #define UPGRADE_PATH "upgrade.path"
184 #define UPGRADE_PATH_LEN 12
185
186 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
187 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
188 return ((strncmp(option, property, len) == 0) &&
189 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
190 }
191
192 // Return true if property starts with "jdk.module." and its ensuing chars match
193 // any of the reserved module properties.
194 // property should be passed without the leading "-D".
195 bool Arguments::is_internal_module_property(const char* property) {
196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
205 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
207 return true;
208 }
209 }
210 return false;
211 }
212
213 // Process java launcher properties.
214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
216 // sun.java.launcher.pid is defined.
217 // Must do this before setting up other system properties,
218 // as some of them may depend on launcher type.
219 for (int index = 0; index < args->nOptions; index++) {
220 const JavaVMOption* option = args->options + index;
221 const char* tail;
222
223 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
224 process_java_launcher_argument(tail, option->extraInfo);
225 continue;
226 }
227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
228 if (strcmp(tail, "true") == 0) {
229 _sun_java_launcher_is_altjvm = true;
230 }
231 continue;
232 }
233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
234 _sun_java_launcher_pid = atoi(tail);
235 continue;
236 }
237 }
238 }
239
240 // Initialize system properties key and value.
241 void Arguments::init_system_properties() {
242
243 // Set up _system_boot_class_path which is not a property but
244 // relies heavily on argument processing and the jdk.boot.class.path.append
245 // property. It is used to store the underlying system boot class path.
246 _system_boot_class_path = new PathString(NULL);
247
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
249 "Java Virtual Machine Specification", false));
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
254
255 // Following are JVMTI agent writable properties.
256 // Properties values are set to NULL and they are
257 // os specific they are initialized in os::init_system_properties_values().
258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
259 _java_library_path = new SystemProperty("java.library.path", NULL, true);
260 _java_home = new SystemProperty("java.home", NULL, true);
261 _java_class_path = new SystemProperty("java.class.path", "", true);
262 // jdk.boot.class.path.append is a non-writeable, internal property.
263 // It can only be set by either:
264 // - -Xbootclasspath/a:
265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
267
268 // Add to System Property list.
269 PropertyList_add(&_system_properties, _sun_boot_library_path);
270 PropertyList_add(&_system_properties, _java_library_path);
271 PropertyList_add(&_system_properties, _java_home);
272 PropertyList_add(&_system_properties, _java_class_path);
273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
274
275 // Set OS specific system properties values
276 os::init_system_properties_values();
277 }
278
279 // Update/Initialize System properties after JDK version number is known
280 void Arguments::init_version_specific_system_properties() {
281 enum { bufsz = 16 };
282 char buffer[bufsz];
283 const char* spec_vendor = "Oracle Corporation";
284 uint32_t spec_version = JDK_Version::current().major_version();
285
286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
287
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.version", buffer, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
294 }
295
296 /*
297 * -XX argument processing:
298 *
299 * -XX arguments are defined in several places, such as:
300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
301 * -XX arguments are parsed in parse_argument().
302 * -XX argument bounds checking is done in check_vm_args_consistency().
303 *
304 * Over time -XX arguments may change. There are mechanisms to handle common cases:
305 *
306 * ALIASED: An option that is simply another name for another option. This is often
307 * part of the process of deprecating a flag, but not all aliases need
308 * to be deprecated.
309 *
310 * Create an alias for an option by adding the old and new option names to the
311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
312 *
313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
314 * support may be removed in the future. Both regular and aliased options may be
315 * deprecated.
316 *
317 * Add a deprecation warning for an option (or alias) by adding an entry in the
318 * "special_jvm_flags" table and setting the "deprecated_in" field.
319 * Often an option "deprecated" in one major release will
320 * be made "obsolete" in the next. In this case the entry should also have it's
321 * "obsolete_in" field set.
322 *
323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
324 * on the command line. A warning is printed to let the user know that option might not
325 * be accepted in the future.
326 *
327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
328 * table and setting the "obsolete_in" field.
329 *
330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
331 * to the current JDK version. The system will flatly refuse to admit the existence of
332 * the flag. This allows a flag to die automatically over JDK releases.
333 *
334 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
336 * - Newly obsolete or expired deprecated options should have their global variable
337 * definitions removed (from globals.hpp, etc) and related implementations removed.
338 *
339 * Recommended approach for removing options:
340 *
341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
343 *
344 * To remove internal options (e.g. diagnostic, experimental, develop options), use
345 * a 2-step model adding major release numbers to the obsolete and expire columns.
346 *
347 * To change the name of an option, use the alias table as well as a 2-step
348 * model adding major release numbers to the deprecate and expire columns.
349 * Think twice about aliasing commonly used customer options.
350 *
351 * There are times when it is appropriate to leave a future release number as undefined.
352 *
353 * Tests: Aliases should be tested in VMAliasOptions.java.
354 * Deprecated options should be tested in VMDeprecatedOptions.java.
355 */
356
357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
360 // the command-line as usual, but will issue a warning.
361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
362 // the command-line, while issuing a warning and ignoring the flag value.
363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
364 // existence of the flag.
365 //
366 // MANUAL CLEANUP ON JDK VERSION UPDATES:
367 // This table ensures that the handling of options will update automatically when the JDK
368 // version is incremented, but the source code needs to be cleanup up manually:
369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
370 // variable should be removed, as well as users of the variable.
371 // - As "deprecated" options age into "obsolete" options, move the entry into the
372 // "Obsolete Flags" section of the table.
373 // - All expired options should be removed from the table.
374 static SpecialFlag const special_jvm_flags[] = {
375 // -------------- Deprecated Flags --------------
376 // --- Non-alias flags - sorted by obsolete_in then expired_in:
377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
379 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
380 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
381 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
382 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
383 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
384
385 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
386 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
389 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
392 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
393
394 // -------------- Obsolete Flags - sorted by expired_in --------------
395 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 #ifndef ZERO
409 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
410 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 #endif // ZERO
412 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
422 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
423 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
424 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
425
426 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
427 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
428 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
429 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
430 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
431 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
432 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
433 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
434 #endif
435
436 { NULL, JDK_Version(0), JDK_Version(0) }
437 };
438
439 // Flags that are aliases for other flags.
440 typedef struct {
441 const char* alias_name;
442 const char* real_name;
443 } AliasedFlag;
444
445 static AliasedFlag const aliased_jvm_flags[] = {
446 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
447 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
448 { "CMSMarkStackSize", "MarkStackSize" },
449 { "G1MarkStackSize", "MarkStackSize" },
450 { "ParallelMarkingThreads", "ConcGCThreads" },
451 { "ParallelCMSThreads", "ConcGCThreads" },
452 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
453 { NULL, NULL}
454 };
455
456 // NOTE: A compatibility request will be necessary for each alias to be removed.
457 static AliasedLoggingFlag const aliased_logging_flags[] = {
458 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
459 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
460 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
461 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
462 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
463 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
464 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
465 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
466 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
467 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
468 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
469 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
470 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
471 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
472 };
473
474 #ifndef PRODUCT
475 // These options are removed in jdk9. Remove this code for jdk10.
476 static AliasedFlag const removed_develop_logging_flags[] = {
477 { "TraceClassInitialization", "-Xlog:class+init" },
478 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
479 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
480 { "TraceItables", "-Xlog:itables=debug" },
481 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
482 { "TraceSafepoint", "-Xlog:safepoint=debug" },
483 { "TraceStartupTime", "-Xlog:startuptime" },
484 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
485 { "PrintVtables", "-Xlog:vtables=debug" },
486 { "VerboseVerification", "-Xlog:verification" },
487 { NULL, NULL }
488 };
489 #endif //PRODUCT
490
491 // Return true if "v" is less than "other", where "other" may be "undefined".
492 static bool version_less_than(JDK_Version v, JDK_Version other) {
493 assert(!v.is_undefined(), "must be defined");
494 if (!other.is_undefined() && v.compare(other) >= 0) {
495 return false;
496 } else {
497 return true;
498 }
499 }
500
501 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
502
503 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
504 // Allow extensions to have priority
505 if (lookup_special_flag_ext(flag_name, flag)) {
506 return true;
507 }
508
509 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
510 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
511 flag = special_jvm_flags[i];
512 return true;
513 }
514 }
515 return false;
516 }
517
518 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
519 assert(version != NULL, "Must provide a version buffer");
520 SpecialFlag flag;
521 if (lookup_special_flag(flag_name, flag)) {
522 if (!flag.obsolete_in.is_undefined()) {
523 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
524 *version = flag.obsolete_in;
525 return true;
526 }
527 }
528 }
529 return false;
530 }
531
532 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
533 assert(version != NULL, "Must provide a version buffer");
534 SpecialFlag flag;
535 if (lookup_special_flag(flag_name, flag)) {
536 if (!flag.deprecated_in.is_undefined()) {
537 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
538 version_less_than(JDK_Version::current(), flag.expired_in)) {
539 *version = flag.deprecated_in;
540 return 1;
541 } else {
542 return -1;
543 }
544 }
545 }
546 return 0;
547 }
548
549 #ifndef PRODUCT
550 const char* Arguments::removed_develop_logging_flag_name(const char* name){
551 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
552 const AliasedFlag& flag = removed_develop_logging_flags[i];
553 if (strcmp(flag.alias_name, name) == 0) {
554 return flag.real_name;
555 }
556 }
557 return NULL;
558 }
559 #endif // PRODUCT
560
561 const char* Arguments::real_flag_name(const char *flag_name) {
562 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
563 const AliasedFlag& flag_status = aliased_jvm_flags[i];
564 if (strcmp(flag_status.alias_name, flag_name) == 0) {
565 return flag_status.real_name;
566 }
567 }
568 return flag_name;
569 }
570
571 #ifdef ASSERT
572 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
573 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
574 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
575 return true;
576 }
577 }
578 return false;
579 }
580
581 static bool verify_special_jvm_flags() {
582 bool success = true;
583 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
584 const SpecialFlag& flag = special_jvm_flags[i];
585 if (lookup_special_flag(flag.name, i)) {
586 warning("Duplicate special flag declaration \"%s\"", flag.name);
587 success = false;
588 }
589 if (flag.deprecated_in.is_undefined() &&
590 flag.obsolete_in.is_undefined()) {
591 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
592 success = false;
593 }
594
595 if (!flag.deprecated_in.is_undefined()) {
596 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
597 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
598 success = false;
599 }
600
601 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
602 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
603 success = false;
604 }
605 }
606
607 if (!flag.obsolete_in.is_undefined()) {
608 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
609 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
610 success = false;
611 }
612
613 // if flag has become obsolete it should not have a "globals" flag defined anymore.
614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
615 if (Flag::find_flag(flag.name) != NULL) {
616 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
617 success = false;
618 }
619 }
620 }
621
622 if (!flag.expired_in.is_undefined()) {
623 // if flag has become expired it should not have a "globals" flag defined anymore.
624 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
625 if (Flag::find_flag(flag.name) != NULL) {
626 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
627 success = false;
628 }
629 }
630 }
631
632 }
633 return success;
634 }
635 #endif
636
637 // Parses a size specification string.
638 bool Arguments::atojulong(const char *s, julong* result) {
639 julong n = 0;
640
641 // First char must be a digit. Don't allow negative numbers or leading spaces.
642 if (!isdigit(*s)) {
643 return false;
644 }
645
646 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
647 char* remainder;
648 errno = 0;
649 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
650 if (errno != 0) {
651 return false;
652 }
653
654 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
655 if (remainder == s || strlen(remainder) > 1) {
656 return false;
657 }
658
659 switch (*remainder) {
660 case 'T': case 't':
661 *result = n * G * K;
662 // Check for overflow.
663 if (*result/((julong)G * K) != n) return false;
664 return true;
665 case 'G': case 'g':
666 *result = n * G;
667 if (*result/G != n) return false;
668 return true;
669 case 'M': case 'm':
670 *result = n * M;
671 if (*result/M != n) return false;
672 return true;
673 case 'K': case 'k':
674 *result = n * K;
675 if (*result/K != n) return false;
676 return true;
677 case '\0':
678 *result = n;
679 return true;
680 default:
681 return false;
682 }
683 }
684
685 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
686 if (size < min_size) return arg_too_small;
687 // Check that size will fit in a size_t (only relevant on 32-bit)
688 if (size > max_uintx) return arg_too_big;
689 return arg_in_range;
690 }
691
692 // Describe an argument out of range error
693 void Arguments::describe_range_error(ArgsRange errcode) {
694 switch(errcode) {
695 case arg_too_big:
696 jio_fprintf(defaultStream::error_stream(),
697 "The specified size exceeds the maximum "
698 "representable size.\n");
699 break;
700 case arg_too_small:
701 case arg_unreadable:
702 case arg_in_range:
703 // do nothing for now
704 break;
705 default:
706 ShouldNotReachHere();
707 }
708 }
709
710 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
711 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
712 return true;
713 } else {
714 return false;
715 }
716 }
717
718 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
719 char* end;
720 errno = 0;
721 double v = strtod(value, &end);
722 if ((errno != 0) || (*end != 0)) {
723 return false;
724 }
725
726 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
727 return true;
728 }
729 return false;
730 }
731
732 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
733 julong v;
734 int int_v;
735 intx intx_v;
736 bool is_neg = false;
737 Flag* result = Flag::find_flag(name, strlen(name));
738
739 if (result == NULL) {
740 return false;
741 }
742
743 // Check the sign first since atojulong() parses only unsigned values.
744 if (*value == '-') {
745 if (!result->is_intx() && !result->is_int()) {
746 return false;
747 }
748 value++;
749 is_neg = true;
750 }
751 if (!Arguments::atojulong(value, &v)) {
752 return false;
753 }
754 if (result->is_int()) {
755 int_v = (int) v;
756 if (is_neg) {
757 int_v = -int_v;
758 }
759 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
760 } else if (result->is_uint()) {
761 uint uint_v = (uint) v;
762 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
763 } else if (result->is_intx()) {
764 intx_v = (intx) v;
765 if (is_neg) {
766 intx_v = -intx_v;
767 }
768 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
769 } else if (result->is_uintx()) {
770 uintx uintx_v = (uintx) v;
771 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
772 } else if (result->is_uint64_t()) {
773 uint64_t uint64_t_v = (uint64_t) v;
774 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
775 } else if (result->is_size_t()) {
776 size_t size_t_v = (size_t) v;
777 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
778 } else {
779 return false;
780 }
781 }
782
783 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
784 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
785 // Contract: CommandLineFlags always returns a pointer that needs freeing.
786 FREE_C_HEAP_ARRAY(char, value);
787 return true;
788 }
789
790 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
791 const char* old_value = "";
792 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
793 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
794 size_t new_len = strlen(new_value);
795 const char* value;
796 char* free_this_too = NULL;
797 if (old_len == 0) {
798 value = new_value;
799 } else if (new_len == 0) {
800 value = old_value;
801 } else {
802 size_t length = old_len + 1 + new_len + 1;
803 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
804 // each new setting adds another LINE to the switch:
805 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
806 value = buf;
807 free_this_too = buf;
808 }
809 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
810 // CommandLineFlags always returns a pointer that needs freeing.
811 FREE_C_HEAP_ARRAY(char, value);
812 if (free_this_too != NULL) {
813 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
814 FREE_C_HEAP_ARRAY(char, free_this_too);
815 }
816 return true;
817 }
818
819 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
820 const char* real_name = real_flag_name(arg);
821 JDK_Version since = JDK_Version();
822 switch (is_deprecated_flag(arg, &since)) {
823 case -1:
824 return NULL; // obsolete or expired, don't process normally
825 case 0:
826 return real_name;
827 case 1: {
828 if (warn) {
829 char version[256];
830 since.to_string(version, sizeof(version));
831 if (real_name != arg) {
832 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
833 arg, version, real_name);
834 } else {
835 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
836 arg, version);
837 }
838 }
839 return real_name;
840 }
841 }
842 ShouldNotReachHere();
843 return NULL;
844 }
845
846 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
847 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
848 // Set tagset string buffer at max size of 256, large enough for any alias tagset
849 const int max_tagset_size = 256;
850 int max_tagset_len = max_tagset_size - 1;
851 char tagset_buffer[max_tagset_size];
852 tagset_buffer[0] = '\0';
853
854 // Write tag-set for aliased logging option, in string list form
855 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
856 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
857 if (i > 0) {
858 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
859 }
860 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
861 }
862 if (!alf.exactMatch) {
863 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
864 }
865 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
866 (on) ? "+" : "-",
867 name,
868 tagset_buffer,
869 (on) ? LogLevel::name(alf.level) : "off");
870 }
871
872 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
873 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
874 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
875 if (strcmp(alf.alias_name, name) == 0) {
876 log_deprecated_flag(name, on, alf);
877 return alf;
878 }
879 }
880 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
881 return a;
882 }
883
884 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
885
886 // range of acceptable characters spelled out for portability reasons
887 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
888 #define BUFLEN 255
889 char name[BUFLEN+1];
890 char dummy;
891 const char* real_name;
892 bool warn_if_deprecated = true;
893
894 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
895 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
896 if (alf.alias_name != NULL){
897 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
898 return true;
899 }
900 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
901 if (real_name == NULL) {
902 return false;
903 }
904 return set_bool_flag(real_name, false, origin);
905 }
906 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
907 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
908 if (alf.alias_name != NULL){
909 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
910 return true;
911 }
912 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
913 if (real_name == NULL) {
914 return false;
915 }
916 return set_bool_flag(real_name, true, origin);
917 }
918
919 char punct;
920 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
921 const char* value = strchr(arg, '=') + 1;
922 Flag* flag;
923
924 // this scanf pattern matches both strings (handled here) and numbers (handled later))
925 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
926 if (alf.alias_name != NULL) {
927 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
928 return true;
929 }
930 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
931 if (real_name == NULL) {
932 return false;
933 }
934 flag = Flag::find_flag(real_name);
935 if (flag != NULL && flag->is_ccstr()) {
936 if (flag->ccstr_accumulates()) {
937 return append_to_string_flag(real_name, value, origin);
938 } else {
939 if (value[0] == '\0') {
940 value = NULL;
941 }
942 return set_string_flag(real_name, value, origin);
943 }
944 } else {
945 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
946 }
947 }
948
949 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
950 const char* value = strchr(arg, '=') + 1;
951 // -XX:Foo:=xxx will reset the string flag to the given value.
952 if (value[0] == '\0') {
953 value = NULL;
954 }
955 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
956 if (real_name == NULL) {
957 return false;
958 }
959 return set_string_flag(real_name, value, origin);
960 }
961
962 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
963 #define SIGNED_NUMBER_RANGE "[-0123456789]"
964 #define NUMBER_RANGE "[0123456789eE+-]"
965 char value[BUFLEN + 1];
966 char value2[BUFLEN + 1];
967 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
968 // Looks like a floating-point number -- try again with more lenient format string
969 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
970 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
971 if (real_name == NULL) {
972 return false;
973 }
974 return set_fp_numeric_flag(real_name, value, origin);
975 }
976 }
977
978 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
979 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
980 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
981 if (real_name == NULL) {
982 return false;
983 }
984 return set_numeric_flag(real_name, value, origin);
985 }
986
987 return false;
988 }
989
990 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
991 assert(bldarray != NULL, "illegal argument");
992
993 if (arg == NULL) {
994 return;
995 }
996
997 int new_count = *count + 1;
998
999 // expand the array and add arg to the last element
1000 if (*bldarray == NULL) {
1001 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1002 } else {
1003 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1004 }
1005 (*bldarray)[*count] = os::strdup_check_oom(arg);
1006 *count = new_count;
1007 }
1008
1009 void Arguments::build_jvm_args(const char* arg) {
1010 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1011 }
1012
1013 void Arguments::build_jvm_flags(const char* arg) {
1014 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1015 }
1016
1017 // utility function to return a string that concatenates all
1018 // strings in a given char** array
1019 const char* Arguments::build_resource_string(char** args, int count) {
1020 if (args == NULL || count == 0) {
1021 return NULL;
1022 }
1023 size_t length = 0;
1024 for (int i = 0; i < count; i++) {
1025 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1026 }
1027 char* s = NEW_RESOURCE_ARRAY(char, length);
1028 char* dst = s;
1029 for (int j = 0; j < count; j++) {
1030 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1031 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1032 dst += offset;
1033 length -= offset;
1034 }
1035 return (const char*) s;
1036 }
1037
1038 void Arguments::print_on(outputStream* st) {
1039 st->print_cr("VM Arguments:");
1040 if (num_jvm_flags() > 0) {
1041 st->print("jvm_flags: "); print_jvm_flags_on(st);
1042 st->cr();
1043 }
1044 if (num_jvm_args() > 0) {
1045 st->print("jvm_args: "); print_jvm_args_on(st);
1046 st->cr();
1047 }
1048 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1049 if (_java_class_path != NULL) {
1050 char* path = _java_class_path->value();
1051 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1052 }
1053 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1054 }
1055
1056 void Arguments::print_summary_on(outputStream* st) {
1057 // Print the command line. Environment variables that are helpful for
1058 // reproducing the problem are written later in the hs_err file.
1059 // flags are from setting file
1060 if (num_jvm_flags() > 0) {
1061 st->print_raw("Settings File: ");
1062 print_jvm_flags_on(st);
1063 st->cr();
1064 }
1065 // args are the command line and environment variable arguments.
1066 st->print_raw("Command Line: ");
1067 if (num_jvm_args() > 0) {
1068 print_jvm_args_on(st);
1069 }
1070 // this is the classfile and any arguments to the java program
1071 if (java_command() != NULL) {
1072 st->print("%s", java_command());
1073 }
1074 st->cr();
1075 }
1076
1077 void Arguments::print_jvm_flags_on(outputStream* st) {
1078 if (_num_jvm_flags > 0) {
1079 for (int i=0; i < _num_jvm_flags; i++) {
1080 st->print("%s ", _jvm_flags_array[i]);
1081 }
1082 }
1083 }
1084
1085 void Arguments::print_jvm_args_on(outputStream* st) {
1086 if (_num_jvm_args > 0) {
1087 for (int i=0; i < _num_jvm_args; i++) {
1088 st->print("%s ", _jvm_args_array[i]);
1089 }
1090 }
1091 }
1092
1093 bool Arguments::process_argument(const char* arg,
1094 jboolean ignore_unrecognized,
1095 Flag::Flags origin) {
1096 JDK_Version since = JDK_Version();
1097
1098 if (parse_argument(arg, origin)) {
1099 return true;
1100 }
1101
1102 // Determine if the flag has '+', '-', or '=' characters.
1103 bool has_plus_minus = (*arg == '+' || *arg == '-');
1104 const char* const argname = has_plus_minus ? arg + 1 : arg;
1105
1106 size_t arg_len;
1107 const char* equal_sign = strchr(argname, '=');
1108 if (equal_sign == NULL) {
1109 arg_len = strlen(argname);
1110 } else {
1111 arg_len = equal_sign - argname;
1112 }
1113
1114 // Only make the obsolete check for valid arguments.
1115 if (arg_len <= BUFLEN) {
1116 // Construct a string which consists only of the argument name without '+', '-', or '='.
1117 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1119 if (is_obsolete_flag(stripped_argname, &since)) {
1120 char version[256];
1121 since.to_string(version, sizeof(version));
1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1123 return true;
1124 }
1125 #ifndef PRODUCT
1126 else {
1127 const char* replacement;
1128 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1129 log_warning(arguments)("%s has been removed. Please use %s instead.",
1130 stripped_argname,
1131 replacement);
1132 return false;
1133 }
1134 }
1135 #endif //PRODUCT
1136 }
1137
1138 // For locked flags, report a custom error message if available.
1139 // Otherwise, report the standard unrecognized VM option.
1140 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1141 if (found_flag != NULL) {
1142 char locked_message_buf[BUFLEN];
1143 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1144 if (strlen(locked_message_buf) == 0) {
1145 if (found_flag->is_bool() && !has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Missing +/- setting for VM option '%s'\n", argname);
1148 } else if (!found_flag->is_bool() && has_plus_minus) {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Unexpected +/- setting in VM option '%s'\n", argname);
1151 } else {
1152 jio_fprintf(defaultStream::error_stream(),
1153 "Improperly specified VM option '%s'\n", argname);
1154 }
1155 } else {
1156 #ifdef PRODUCT
1157 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1158 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1159 if (ignore_unrecognized && mismatched) {
1160 return true;
1161 }
1162 #endif
1163 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1164 }
1165 } else {
1166 if (ignore_unrecognized) {
1167 return true;
1168 }
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Unrecognized VM option '%s'\n", argname);
1171 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1172 if (fuzzy_matched != NULL) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Did you mean '%s%s%s'? ",
1175 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1176 fuzzy_matched->_name,
1177 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1178 }
1179 }
1180
1181 // allow for commandline "commenting out" options like -XX:#+Verbose
1182 return arg[0] == '#';
1183 }
1184
1185 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1186 FILE* stream = fopen(file_name, "rb");
1187 if (stream == NULL) {
1188 if (should_exist) {
1189 jio_fprintf(defaultStream::error_stream(),
1190 "Could not open settings file %s\n", file_name);
1191 return false;
1192 } else {
1193 return true;
1194 }
1195 }
1196
1197 char token[1024];
1198 int pos = 0;
1199
1200 bool in_white_space = true;
1201 bool in_comment = false;
1202 bool in_quote = false;
1203 char quote_c = 0;
1204 bool result = true;
1205
1206 int c = getc(stream);
1207 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1208 if (in_white_space) {
1209 if (in_comment) {
1210 if (c == '\n') in_comment = false;
1211 } else {
1212 if (c == '#') in_comment = true;
1213 else if (!isspace(c)) {
1214 in_white_space = false;
1215 token[pos++] = c;
1216 }
1217 }
1218 } else {
1219 if (c == '\n' || (!in_quote && isspace(c))) {
1220 // token ends at newline, or at unquoted whitespace
1221 // this allows a way to include spaces in string-valued options
1222 token[pos] = '\0';
1223 logOption(token);
1224 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1225 build_jvm_flags(token);
1226 pos = 0;
1227 in_white_space = true;
1228 in_quote = false;
1229 } else if (!in_quote && (c == '\'' || c == '"')) {
1230 in_quote = true;
1231 quote_c = c;
1232 } else if (in_quote && (c == quote_c)) {
1233 in_quote = false;
1234 } else {
1235 token[pos++] = c;
1236 }
1237 }
1238 c = getc(stream);
1239 }
1240 if (pos > 0) {
1241 token[pos] = '\0';
1242 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1243 build_jvm_flags(token);
1244 }
1245 fclose(stream);
1246 return result;
1247 }
1248
1249 //=============================================================================================================
1250 // Parsing of properties (-D)
1251
1252 const char* Arguments::get_property(const char* key) {
1253 return PropertyList_get_value(system_properties(), key);
1254 }
1255
1256 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1257 const char* eq = strchr(prop, '=');
1258 const char* key;
1259 const char* value = "";
1260
1261 if (eq == NULL) {
1262 // property doesn't have a value, thus use passed string
1263 key = prop;
1264 } else {
1265 // property have a value, thus extract it and save to the
1266 // allocated string
1267 size_t key_len = eq - prop;
1268 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1269
1270 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1271 key = tmp_key;
1272
1273 value = &prop[key_len + 1];
1274 }
1275
1276 if (strcmp(key, "java.compiler") == 0) {
1277 process_java_compiler_argument(value);
1278 // Record value in Arguments, but let it get passed to Java.
1279 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1280 strcmp(key, "sun.java.launcher.pid") == 0) {
1281 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1282 // private and are processed in process_sun_java_launcher_properties();
1283 // the sun.java.launcher property is passed on to the java application
1284 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1285 // append is true, writable is true, internal is false
1286 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1287 WriteableProperty, ExternalProperty);
1288 } else {
1289 if (strcmp(key, "sun.java.command") == 0) {
1290 char *old_java_command = _java_command;
1291 _java_command = os::strdup_check_oom(value, mtArguments);
1292 if (old_java_command != NULL) {
1293 os::free(old_java_command);
1294 }
1295 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1296 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1297 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1298 // its value without going through the property list or making a Java call.
1299 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1300 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1301 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1302 os::free((void *)old_java_vendor_url_bug);
1303 }
1304 }
1305
1306 // Create new property and add at the end of the list
1307 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1308 }
1309
1310 if (key != prop) {
1311 // SystemProperty copy passed value, thus free previously allocated
1312 // memory
1313 FreeHeap((void *)key);
1314 }
1315
1316 return true;
1317 }
1318
1319 #if INCLUDE_CDS
1320 void Arguments::check_unsupported_dumping_properties() {
1321 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1322 const char* unsupported_properties[] = { "jdk.module.main",
1323 "jdk.module.limitmods",
1324 "jdk.module.path",
1325 "jdk.module.upgrade.path",
1326 "jdk.module.addmods.0",
1327 "jdk.module.patch.0" };
1328 const char* unsupported_options[] = { "-m", // cannot use at dump time
1329 "--limit-modules", // ignored at dump time
1330 "--module-path", // ignored at dump time
1331 "--upgrade-module-path", // ignored at dump time
1332 "--add-modules", // ignored at dump time
1333 "--patch-module" // ignored at dump time
1334 };
1335 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1336 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1337 // vm will exit with an error message. Otherwise, it will print an informational message if
1338 // PrintSharedSpaces is enabled.
1339 uint info_idx = 1;
1340 SystemProperty* sp = system_properties();
1341 while (sp != NULL) {
1342 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1343 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1344 if (i < info_idx) {
1345 vm_exit_during_initialization(
1346 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1347 } else {
1348 if (PrintSharedSpaces) {
1349 tty->print_cr(
1350 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1351 }
1352 }
1353 }
1354 }
1355 sp = sp->next();
1356 }
1357
1358 // Check for an exploded module build in use with -Xshare:dump.
1359 if (!has_jimage()) {
1360 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1361 }
1362 }
1363 #endif
1364
1365 //===========================================================================================================
1366 // Setting int/mixed/comp mode flags
1367
1368 void Arguments::set_mode_flags(Mode mode) {
1369 // Set up default values for all flags.
1370 // If you add a flag to any of the branches below,
1371 // add a default value for it here.
1372 set_java_compiler(false);
1373 _mode = mode;
1374
1375 // Ensure Agent_OnLoad has the correct initial values.
1376 // This may not be the final mode; mode may change later in onload phase.
1377 PropertyList_unique_add(&_system_properties, "java.vm.info",
1378 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1379
1380 UseInterpreter = true;
1381 UseCompiler = true;
1382 UseLoopCounter = true;
1383
1384 // Default values may be platform/compiler dependent -
1385 // use the saved values
1386 ClipInlining = Arguments::_ClipInlining;
1387 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1388 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1389 BackgroundCompilation = Arguments::_BackgroundCompilation;
1390 if (TieredCompilation) {
1391 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1392 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1393 }
1394 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1395 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1396 }
1397 }
1398
1399 // Change from defaults based on mode
1400 switch (mode) {
1401 default:
1402 ShouldNotReachHere();
1403 break;
1404 case _int:
1405 UseCompiler = false;
1406 UseLoopCounter = false;
1407 AlwaysCompileLoopMethods = false;
1408 UseOnStackReplacement = false;
1409 break;
1410 case _mixed:
1411 // same as default
1412 break;
1413 case _comp:
1414 UseInterpreter = false;
1415 BackgroundCompilation = false;
1416 ClipInlining = false;
1417 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1418 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1419 // compile a level 4 (C2) and then continue executing it.
1420 if (TieredCompilation) {
1421 Tier3InvokeNotifyFreqLog = 0;
1422 Tier4InvocationThreshold = 0;
1423 }
1424 break;
1425 }
1426 }
1427
1428 // Conflict: required to use shared spaces (-Xshare:on), but
1429 // incompatible command line options were chosen.
1430 static void no_shared_spaces(const char* message) {
1431 if (RequireSharedSpaces) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "Class data sharing is inconsistent with other specified options.\n");
1434 vm_exit_during_initialization("Unable to use shared archive.", message);
1435 } else {
1436 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1437 }
1438 }
1439
1440 // Returns threshold scaled with the value of scale.
1441 // If scale < 0.0, threshold is returned without scaling.
1442 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1443 if (scale == 1.0 || scale < 0.0) {
1444 return threshold;
1445 } else {
1446 return (intx)(threshold * scale);
1447 }
1448 }
1449
1450 // Returns freq_log scaled with the value of scale.
1451 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1452 // If scale < 0.0, freq_log is returned without scaling.
1453 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1454 // Check if scaling is necessary or if negative value was specified.
1455 if (scale == 1.0 || scale < 0.0) {
1456 return freq_log;
1457 }
1458 // Check values to avoid calculating log2 of 0.
1459 if (scale == 0.0 || freq_log == 0) {
1460 return 0;
1461 }
1462 // Determine the maximum notification frequency value currently supported.
1463 // The largest mask value that the interpreter/C1 can handle is
1464 // of length InvocationCounter::number_of_count_bits. Mask values are always
1465 // one bit shorter then the value of the notification frequency. Set
1466 // max_freq_bits accordingly.
1467 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1468 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1469 if (scaled_freq == 0) {
1470 // Return 0 right away to avoid calculating log2 of 0.
1471 return 0;
1472 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1473 return max_freq_bits;
1474 } else {
1475 return log2_intptr(scaled_freq);
1476 }
1477 }
1478
1479 void Arguments::set_tiered_flags() {
1480 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1481 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1482 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1483 }
1484 if (CompilationPolicyChoice < 2) {
1485 vm_exit_during_initialization(
1486 "Incompatible compilation policy selected", NULL);
1487 }
1488 // Increase the code cache size - tiered compiles a lot more.
1489 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1490 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1491 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1492 }
1493 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1494 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1495 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1496 }
1497 if (!UseInterpreter) { // -Xcomp
1498 Tier3InvokeNotifyFreqLog = 0;
1499 Tier4InvocationThreshold = 0;
1500 }
1501
1502 if (CompileThresholdScaling < 0) {
1503 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1504 }
1505
1506 // Scale tiered compilation thresholds.
1507 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1508 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1509 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1510 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1511
1512 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1513 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1514 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1515 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1516
1517 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1518 // once these thresholds become supported.
1519
1520 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1521 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1522
1523 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1524 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1525
1526 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1527
1528 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1529 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1530 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1531 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1532 }
1533 }
1534
1535 #if INCLUDE_ALL_GCS
1536 static void disable_adaptive_size_policy(const char* collector_name) {
1537 if (UseAdaptiveSizePolicy) {
1538 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1539 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1540 collector_name);
1541 }
1542 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1543 }
1544 }
1545
1546 void Arguments::set_parnew_gc_flags() {
1547 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1548 "control point invariant");
1549 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1550 assert(UseParNewGC, "ParNew should always be used with CMS");
1551
1552 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1553 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1554 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1555 } else if (ParallelGCThreads == 0) {
1556 jio_fprintf(defaultStream::error_stream(),
1557 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1558 vm_exit(1);
1559 }
1560
1561 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1562 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1563 // we set them to 1024 and 1024.
1564 // See CR 6362902.
1565 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1566 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1567 }
1568 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1569 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1570 }
1571
1572 // When using compressed oops, we use local overflow stacks,
1573 // rather than using a global overflow list chained through
1574 // the klass word of the object's pre-image.
1575 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1576 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1577 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1578 }
1579 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1580 }
1581 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1582 }
1583
1584 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1585 // sparc/solaris for certain applications, but would gain from
1586 // further optimization and tuning efforts, and would almost
1587 // certainly gain from analysis of platform and environment.
1588 void Arguments::set_cms_and_parnew_gc_flags() {
1589 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1590 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1591 assert(UseParNewGC, "ParNew should always be used with CMS");
1592
1593 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1594 disable_adaptive_size_policy("UseConcMarkSweepGC");
1595
1596 set_parnew_gc_flags();
1597
1598 size_t max_heap = align_size_down(MaxHeapSize,
1599 CardTableRS::ct_max_alignment_constraint());
1600
1601 // Now make adjustments for CMS
1602 intx tenuring_default = (intx)6;
1603 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1604
1605 // Preferred young gen size for "short" pauses:
1606 // upper bound depends on # of threads and NewRatio.
1607 const size_t preferred_max_new_size_unaligned =
1608 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1609 size_t preferred_max_new_size =
1610 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1611
1612 // Unless explicitly requested otherwise, size young gen
1613 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1614
1615 // If either MaxNewSize or NewRatio is set on the command line,
1616 // assume the user is trying to set the size of the young gen.
1617 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1618
1619 // Set MaxNewSize to our calculated preferred_max_new_size unless
1620 // NewSize was set on the command line and it is larger than
1621 // preferred_max_new_size.
1622 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1623 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1624 } else {
1625 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1626 }
1627 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1628
1629 // Code along this path potentially sets NewSize and OldSize
1630 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1631 min_heap_size(), InitialHeapSize, max_heap);
1632 size_t min_new = preferred_max_new_size;
1633 if (FLAG_IS_CMDLINE(NewSize)) {
1634 min_new = NewSize;
1635 }
1636 if (max_heap > min_new && min_heap_size() > min_new) {
1637 // Unless explicitly requested otherwise, make young gen
1638 // at least min_new, and at most preferred_max_new_size.
1639 if (FLAG_IS_DEFAULT(NewSize)) {
1640 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1641 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1642 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1643 }
1644 // Unless explicitly requested otherwise, size old gen
1645 // so it's NewRatio x of NewSize.
1646 if (FLAG_IS_DEFAULT(OldSize)) {
1647 if (max_heap > NewSize) {
1648 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1649 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1650 }
1651 }
1652 }
1653 }
1654 // Unless explicitly requested otherwise, definitely
1655 // promote all objects surviving "tenuring_default" scavenges.
1656 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1657 FLAG_IS_DEFAULT(SurvivorRatio)) {
1658 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1659 }
1660 // If we decided above (or user explicitly requested)
1661 // `promote all' (via MaxTenuringThreshold := 0),
1662 // prefer minuscule survivor spaces so as not to waste
1663 // space for (non-existent) survivors
1664 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1665 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1666 }
1667
1668 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1669 // but rather the number of free blocks of a given size that are used when
1670 // replenishing the local per-worker free list caches.
1671 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1672 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1673 // OldPLAB sizing manually turned off: Use a larger default setting,
1674 // unless it was manually specified. This is because a too-low value
1675 // will slow down scavenges.
1676 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1677 } else {
1678 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1679 }
1680 }
1681
1682 // If either of the static initialization defaults have changed, note this
1683 // modification.
1684 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1685 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1686 }
1687
1688 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1689 }
1690 #endif // INCLUDE_ALL_GCS
1691
1692 void set_object_alignment() {
1693 // Object alignment.
1694 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1695 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1696 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1697 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1698 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1699 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1700
1701 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1702 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1703
1704 // Oop encoding heap max
1705 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1706
1707 if (SurvivorAlignmentInBytes == 0) {
1708 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1709 }
1710
1711 #if INCLUDE_ALL_GCS
1712 // Set CMS global values
1713 CompactibleFreeListSpace::set_cms_values();
1714 #endif // INCLUDE_ALL_GCS
1715 }
1716
1717 size_t Arguments::max_heap_for_compressed_oops() {
1718 // Avoid sign flip.
1719 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1720 // We need to fit both the NULL page and the heap into the memory budget, while
1721 // keeping alignment constraints of the heap. To guarantee the latter, as the
1722 // NULL page is located before the heap, we pad the NULL page to the conservative
1723 // maximum alignment that the GC may ever impose upon the heap.
1724 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1725 _conservative_max_heap_alignment);
1726
1727 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1728 NOT_LP64(ShouldNotReachHere(); return 0);
1729 }
1730
1731 bool Arguments::should_auto_select_low_pause_collector() {
1732 if (UseAutoGCSelectPolicy &&
1733 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1734 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1735 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1736 return true;
1737 }
1738 return false;
1739 }
1740
1741 void Arguments::set_use_compressed_oops() {
1742 #ifndef ZERO
1743 #ifdef _LP64
1744 // MaxHeapSize is not set up properly at this point, but
1745 // the only value that can override MaxHeapSize if we are
1746 // to use UseCompressedOops is InitialHeapSize.
1747 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1748
1749 if (max_heap_size <= max_heap_for_compressed_oops()) {
1750 #if !defined(COMPILER1) || defined(TIERED)
1751 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1752 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1753 }
1754 #endif
1755 } else {
1756 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1757 warning("Max heap size too large for Compressed Oops");
1758 FLAG_SET_DEFAULT(UseCompressedOops, false);
1759 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1760 }
1761 }
1762 #endif // _LP64
1763 #endif // ZERO
1764 }
1765
1766
1767 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1768 // set_use_compressed_oops().
1769 void Arguments::set_use_compressed_klass_ptrs() {
1770 #ifndef ZERO
1771 #ifdef _LP64
1772 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1773 if (!UseCompressedOops) {
1774 if (UseCompressedClassPointers) {
1775 warning("UseCompressedClassPointers requires UseCompressedOops");
1776 }
1777 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1778 } else {
1779 // Turn on UseCompressedClassPointers too
1780 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1781 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1782 }
1783 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1784 if (UseCompressedClassPointers) {
1785 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1786 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1787 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1788 }
1789 }
1790 }
1791 #endif // _LP64
1792 #endif // !ZERO
1793 }
1794
1795 void Arguments::set_conservative_max_heap_alignment() {
1796 // The conservative maximum required alignment for the heap is the maximum of
1797 // the alignments imposed by several sources: any requirements from the heap
1798 // itself, the collector policy and the maximum page size we may run the VM
1799 // with.
1800 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1801 #if INCLUDE_ALL_GCS
1802 if (UseParallelGC) {
1803 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1804 } else if (UseG1GC) {
1805 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1806 }
1807 #endif // INCLUDE_ALL_GCS
1808 _conservative_max_heap_alignment = MAX4(heap_alignment,
1809 (size_t)os::vm_allocation_granularity(),
1810 os::max_page_size(),
1811 CollectorPolicy::compute_heap_alignment());
1812 }
1813
1814 bool Arguments::gc_selected() {
1815 #if INCLUDE_ALL_GCS
1816 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1817 #else
1818 return UseSerialGC;
1819 #endif // INCLUDE_ALL_GCS
1820 }
1821
1822 void Arguments::select_gc_ergonomically() {
1823 #if INCLUDE_ALL_GCS
1824 if (os::is_server_class_machine()) {
1825 if (!UseAutoGCSelectPolicy) {
1826 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1827 } else {
1828 if (should_auto_select_low_pause_collector()) {
1829 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1830 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1831 } else {
1832 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1833 }
1834 }
1835 } else {
1836 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1837 }
1838 #else
1839 UNSUPPORTED_OPTION(UseG1GC);
1840 UNSUPPORTED_OPTION(UseParallelGC);
1841 UNSUPPORTED_OPTION(UseParallelOldGC);
1842 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1843 UNSUPPORTED_OPTION(UseParNewGC);
1844 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1845 #endif // INCLUDE_ALL_GCS
1846 }
1847
1848 void Arguments::select_gc() {
1849 if (!gc_selected()) {
1850 select_gc_ergonomically();
1851 if (!gc_selected()) {
1852 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1853 }
1854 }
1855 }
1856
1857 void Arguments::set_ergonomics_flags() {
1858 select_gc();
1859
1860 #if defined(COMPILER2) || INCLUDE_JVMCI
1861 // Shared spaces work fine with other GCs but causes bytecode rewriting
1862 // to be disabled, which hurts interpreter performance and decreases
1863 // server performance. When -server is specified, keep the default off
1864 // unless it is asked for. Future work: either add bytecode rewriting
1865 // at link time, or rewrite bytecodes in non-shared methods.
1866 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1867 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1868 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1869 }
1870 #endif
1871
1872 set_conservative_max_heap_alignment();
1873
1874 #ifndef ZERO
1875 #ifdef _LP64
1876 set_use_compressed_oops();
1877
1878 // set_use_compressed_klass_ptrs() must be called after calling
1879 // set_use_compressed_oops().
1880 set_use_compressed_klass_ptrs();
1881
1882 // Also checks that certain machines are slower with compressed oops
1883 // in vm_version initialization code.
1884 #endif // _LP64
1885 #endif // !ZERO
1886
1887 }
1888
1889 void Arguments::set_parallel_gc_flags() {
1890 assert(UseParallelGC || UseParallelOldGC, "Error");
1891 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1892 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1893 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1894 }
1895 FLAG_SET_DEFAULT(UseParallelGC, true);
1896
1897 // If no heap maximum was requested explicitly, use some reasonable fraction
1898 // of the physical memory, up to a maximum of 1GB.
1899 FLAG_SET_DEFAULT(ParallelGCThreads,
1900 Abstract_VM_Version::parallel_worker_threads());
1901 if (ParallelGCThreads == 0) {
1902 jio_fprintf(defaultStream::error_stream(),
1903 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1904 vm_exit(1);
1905 }
1906
1907 if (UseAdaptiveSizePolicy) {
1908 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1909 // unless the user actually sets these flags.
1910 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1911 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1912 }
1913 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1914 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1915 }
1916 }
1917
1918 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1919 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1920 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1921 // See CR 6362902 for details.
1922 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1923 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1924 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1925 }
1926 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1927 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1928 }
1929 }
1930
1931 if (UseParallelOldGC) {
1932 // Par compact uses lower default values since they are treated as
1933 // minimums. These are different defaults because of the different
1934 // interpretation and are not ergonomically set.
1935 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1936 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1937 }
1938 }
1939 }
1940
1941 void Arguments::set_g1_gc_flags() {
1942 assert(UseG1GC, "Error");
1943 #if defined(COMPILER1) || INCLUDE_JVMCI
1944 FastTLABRefill = false;
1945 #endif
1946 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1947 if (ParallelGCThreads == 0) {
1948 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1949 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1950 }
1951
1952 #if INCLUDE_ALL_GCS
1953 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1954 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1955 }
1956 #endif
1957
1958 // MarkStackSize will be set (if it hasn't been set by the user)
1959 // when concurrent marking is initialized.
1960 // Its value will be based upon the number of parallel marking threads.
1961 // But we do set the maximum mark stack size here.
1962 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1963 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1964 }
1965
1966 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1967 // In G1, we want the default GC overhead goal to be higher than
1968 // it is for PS, or the heap might be expanded too aggressively.
1969 // We set it here to ~8%.
1970 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1971 }
1972
1973 // Below, we might need to calculate the pause time interval based on
1974 // the pause target. When we do so we are going to give G1 maximum
1975 // flexibility and allow it to do pauses when it needs to. So, we'll
1976 // arrange that the pause interval to be pause time target + 1 to
1977 // ensure that a) the pause time target is maximized with respect to
1978 // the pause interval and b) we maintain the invariant that pause
1979 // time target < pause interval. If the user does not want this
1980 // maximum flexibility, they will have to set the pause interval
1981 // explicitly.
1982
1983 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1984 // The default pause time target in G1 is 200ms
1985 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1986 }
1987
1988 // Then, if the interval parameter was not set, set it according to
1989 // the pause time target (this will also deal with the case when the
1990 // pause time target is the default value).
1991 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1992 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1993 }
1994
1995 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1996 }
1997
1998 void Arguments::set_gc_specific_flags() {
1999 #if INCLUDE_ALL_GCS
2000 // Set per-collector flags
2001 if (UseParallelGC || UseParallelOldGC) {
2002 set_parallel_gc_flags();
2003 } else if (UseConcMarkSweepGC) {
2004 set_cms_and_parnew_gc_flags();
2005 } else if (UseG1GC) {
2006 set_g1_gc_flags();
2007 }
2008 if (AssumeMP && !UseSerialGC) {
2009 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2010 warning("If the number of processors is expected to increase from one, then"
2011 " you should configure the number of parallel GC threads appropriately"
2012 " using -XX:ParallelGCThreads=N");
2013 }
2014 }
2015 if (MinHeapFreeRatio == 100) {
2016 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2017 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2018 }
2019
2020 // If class unloading is disabled, also disable concurrent class unloading.
2021 if (!ClassUnloading) {
2022 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2023 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2024 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2025 }
2026 #endif // INCLUDE_ALL_GCS
2027 }
2028
2029 julong Arguments::limit_by_allocatable_memory(julong limit) {
2030 julong max_allocatable;
2031 julong result = limit;
2032 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2033 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2034 }
2035 return result;
2036 }
2037
2038 // Use static initialization to get the default before parsing
2039 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2040
2041 void Arguments::set_heap_size() {
2042 julong phys_mem =
2043 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2044 : (julong)MaxRAM;
2045
2046 // Experimental support for CGroup memory limits
2047 if (UseCGroupMemoryLimitForHeap) {
2048 // This is a rough indicator that a CGroup limit may be in force
2049 // for this process
2050 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2051 FILE *fp = fopen(lim_file, "r");
2052 if (fp != NULL) {
2053 julong cgroup_max = 0;
2054 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2055 if (ret == 1 && cgroup_max > 0) {
2056 // If unlimited, cgroup_max will be a very large, but unspecified
2057 // value, so use initial phys_mem as a limit
2058 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2059 JULONG_FORMAT "MB) and initial phys_mem ("
2060 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2061 phys_mem = MIN2(cgroup_max, phys_mem);
2062 } else {
2063 warning("Unable to read/parse cgroup memory limit from %s: %s",
2064 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2065 }
2066 fclose(fp);
2067 } else {
2068 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2069 }
2070 }
2071
2072 // If the maximum heap size has not been set with -Xmx,
2073 // then set it as fraction of the size of physical memory,
2074 // respecting the maximum and minimum sizes of the heap.
2075 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2076 julong reasonable_max = phys_mem / MaxRAMFraction;
2077
2078 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2079 // Small physical memory, so use a minimum fraction of it for the heap
2080 reasonable_max = phys_mem / MinRAMFraction;
2081 } else {
2082 // Not-small physical memory, so require a heap at least
2083 // as large as MaxHeapSize
2084 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2085 }
2086 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2087 // Limit the heap size to ErgoHeapSizeLimit
2088 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2089 }
2090 if (UseCompressedOops) {
2091 // Limit the heap size to the maximum possible when using compressed oops
2092 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2093
2094 // HeapBaseMinAddress can be greater than default but not less than.
2095 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2096 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2097 // matches compressed oops printing flags
2098 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2099 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2100 DefaultHeapBaseMinAddress,
2101 DefaultHeapBaseMinAddress/G,
2102 HeapBaseMinAddress);
2103 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2104 }
2105 }
2106
2107 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2108 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2109 // but it should be not less than default MaxHeapSize.
2110 max_coop_heap -= HeapBaseMinAddress;
2111 }
2112 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2113 }
2114 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2115
2116 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2117 // An initial heap size was specified on the command line,
2118 // so be sure that the maximum size is consistent. Done
2119 // after call to limit_by_allocatable_memory because that
2120 // method might reduce the allocation size.
2121 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2122 }
2123
2124 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2125 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2126 }
2127
2128 // If the minimum or initial heap_size have not been set or requested to be set
2129 // ergonomically, set them accordingly.
2130 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2131 julong reasonable_minimum = (julong)(OldSize + NewSize);
2132
2133 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2134
2135 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2136
2137 if (InitialHeapSize == 0) {
2138 julong reasonable_initial = phys_mem / InitialRAMFraction;
2139
2140 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2141 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2142
2143 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2144
2145 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2146 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2147 }
2148 // If the minimum heap size has not been set (via -Xms),
2149 // synchronize with InitialHeapSize to avoid errors with the default value.
2150 if (min_heap_size() == 0) {
2151 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2152 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2153 }
2154 }
2155 }
2156
2157 // This option inspects the machine and attempts to set various
2158 // parameters to be optimal for long-running, memory allocation
2159 // intensive jobs. It is intended for machines with large
2160 // amounts of cpu and memory.
2161 jint Arguments::set_aggressive_heap_flags() {
2162 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2163 // VM, but we may not be able to represent the total physical memory
2164 // available (like having 8gb of memory on a box but using a 32bit VM).
2165 // Thus, we need to make sure we're using a julong for intermediate
2166 // calculations.
2167 julong initHeapSize;
2168 julong total_memory = os::physical_memory();
2169
2170 if (total_memory < (julong) 256 * M) {
2171 jio_fprintf(defaultStream::error_stream(),
2172 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2173 vm_exit(1);
2174 }
2175
2176 // The heap size is half of available memory, or (at most)
2177 // all of possible memory less 160mb (leaving room for the OS
2178 // when using ISM). This is the maximum; because adaptive sizing
2179 // is turned on below, the actual space used may be smaller.
2180
2181 initHeapSize = MIN2(total_memory / (julong) 2,
2182 total_memory - (julong) 160 * M);
2183
2184 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2185
2186 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2187 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193 // Currently the minimum size and the initial heap sizes are the same.
2194 set_min_heap_size(initHeapSize);
2195 }
2196 if (FLAG_IS_DEFAULT(NewSize)) {
2197 // Make the young generation 3/8ths of the total heap.
2198 if (FLAG_SET_CMDLINE(size_t, NewSize,
2199 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2200 return JNI_EINVAL;
2201 }
2202 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2203 return JNI_EINVAL;
2204 }
2205 }
2206
2207 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2208 FLAG_SET_DEFAULT(UseLargePages, true);
2209 #endif
2210
2211 // Increase some data structure sizes for efficiency
2212 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221
2222 // See the OldPLABSize comment below, but replace 'after promotion'
2223 // with 'after copying'. YoungPLABSize is the size of the survivor
2224 // space per-gc-thread buffers. The default is 4kw.
2225 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2226 return JNI_EINVAL;
2227 }
2228
2229 // OldPLABSize is the size of the buffers in the old gen that
2230 // UseParallelGC uses to promote live data that doesn't fit in the
2231 // survivor spaces. At any given time, there's one for each gc thread.
2232 // The default size is 1kw. These buffers are rarely used, since the
2233 // survivor spaces are usually big enough. For specjbb, however, there
2234 // are occasions when there's lots of live data in the young gen
2235 // and we end up promoting some of it. We don't have a definite
2236 // explanation for why bumping OldPLABSize helps, but the theory
2237 // is that a bigger PLAB results in retaining something like the
2238 // original allocation order after promotion, which improves mutator
2239 // locality. A minor effect may be that larger PLABs reduce the
2240 // number of PLAB allocation events during gc. The value of 8kw
2241 // was arrived at by experimenting with specjbb.
2242 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2243 return JNI_EINVAL;
2244 }
2245
2246 // Enable parallel GC and adaptive generation sizing
2247 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2248 return JNI_EINVAL;
2249 }
2250 FLAG_SET_DEFAULT(ParallelGCThreads,
2251 Abstract_VM_Version::parallel_worker_threads());
2252
2253 // Encourage steady state memory management
2254 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2255 return JNI_EINVAL;
2256 }
2257
2258 // This appears to improve mutator locality
2259 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2260 return JNI_EINVAL;
2261 }
2262
2263 // Get around early Solaris scheduling bug
2264 // (affinity vs other jobs on system)
2265 // but disallow DR and offlining (5008695).
2266 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2267 return JNI_EINVAL;
2268 }
2269
2270 return JNI_OK;
2271 }
2272
2273 // This must be called after ergonomics.
2274 void Arguments::set_bytecode_flags() {
2275 if (!RewriteBytecodes) {
2276 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2277 }
2278 }
2279
2280 // Aggressive optimization flags -XX:+AggressiveOpts
2281 jint Arguments::set_aggressive_opts_flags() {
2282 #ifdef COMPILER2
2283 if (AggressiveUnboxing) {
2284 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2285 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2286 } else if (!EliminateAutoBox) {
2287 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2288 AggressiveUnboxing = false;
2289 }
2290 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2291 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2292 } else if (!DoEscapeAnalysis) {
2293 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2294 AggressiveUnboxing = false;
2295 }
2296 }
2297 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2298 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2299 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2300 }
2301 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2302 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2303 }
2304
2305 // Feed the cache size setting into the JDK
2306 char buffer[1024];
2307 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2308 if (!add_property(buffer)) {
2309 return JNI_ENOMEM;
2310 }
2311 }
2312 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2313 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2314 }
2315 #endif
2316
2317 if (AggressiveOpts) {
2318 // Sample flag setting code
2319 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2320 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2321 // }
2322 }
2323
2324 return JNI_OK;
2325 }
2326
2327 //===========================================================================================================
2328 // Parsing of java.compiler property
2329
2330 void Arguments::process_java_compiler_argument(const char* arg) {
2331 // For backwards compatibility, Djava.compiler=NONE or ""
2332 // causes us to switch to -Xint mode UNLESS -Xdebug
2333 // is also specified.
2334 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2335 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2336 }
2337 }
2338
2339 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2340 _sun_java_launcher = os::strdup_check_oom(launcher);
2341 }
2342
2343 bool Arguments::created_by_java_launcher() {
2344 assert(_sun_java_launcher != NULL, "property must have value");
2345 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2346 }
2347
2348 bool Arguments::sun_java_launcher_is_altjvm() {
2349 return _sun_java_launcher_is_altjvm;
2350 }
2351
2352 //===========================================================================================================
2353 // Parsing of main arguments
2354
2355 #if INCLUDE_JVMCI
2356 // Check consistency of jvmci vm argument settings.
2357 bool Arguments::check_jvmci_args_consistency() {
2358 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2359 }
2360 #endif //INCLUDE_JVMCI
2361
2362 // Check consistency of GC selection
2363 bool Arguments::check_gc_consistency() {
2364 // Ensure that the user has not selected conflicting sets
2365 // of collectors.
2366 uint i = 0;
2367 if (UseSerialGC) i++;
2368 if (UseConcMarkSweepGC) i++;
2369 if (UseParallelGC || UseParallelOldGC) i++;
2370 if (UseG1GC) i++;
2371 if (i > 1) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Conflicting collector combinations in option list; "
2374 "please refer to the release notes for the combinations "
2375 "allowed\n");
2376 return false;
2377 }
2378
2379 if (UseConcMarkSweepGC && !UseParNewGC) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2382 return false;
2383 }
2384
2385 if (UseParNewGC && !UseConcMarkSweepGC) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2388 return false;
2389 }
2390
2391 return true;
2392 }
2393
2394 // Check the consistency of vm_init_args
2395 bool Arguments::check_vm_args_consistency() {
2396 // Method for adding checks for flag consistency.
2397 // The intent is to warn the user of all possible conflicts,
2398 // before returning an error.
2399 // Note: Needs platform-dependent factoring.
2400 bool status = true;
2401
2402 if (TLABRefillWasteFraction == 0) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "TLABRefillWasteFraction should be a denominator, "
2405 "not " SIZE_FORMAT "\n",
2406 TLABRefillWasteFraction);
2407 status = false;
2408 }
2409
2410 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2411 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2412 }
2413
2414 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2415 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2416 }
2417
2418 if (GCTimeLimit == 100) {
2419 // Turn off gc-overhead-limit-exceeded checks
2420 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2421 }
2422
2423 status = status && check_gc_consistency();
2424
2425 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2426 // insists that we hold the requisite locks so that the iteration is
2427 // MT-safe. For the verification at start-up and shut-down, we don't
2428 // yet have a good way of acquiring and releasing these locks,
2429 // which are not visible at the CollectedHeap level. We want to
2430 // be able to acquire these locks and then do the iteration rather
2431 // than just disable the lock verification. This will be fixed under
2432 // bug 4788986.
2433 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2434 if (VerifyDuringStartup) {
2435 warning("Heap verification at start-up disabled "
2436 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2437 VerifyDuringStartup = false; // Disable verification at start-up
2438 }
2439
2440 if (VerifyBeforeExit) {
2441 warning("Heap verification at shutdown disabled "
2442 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2443 VerifyBeforeExit = false; // Disable verification at shutdown
2444 }
2445 }
2446
2447 if (PrintNMTStatistics) {
2448 #if INCLUDE_NMT
2449 if (MemTracker::tracking_level() == NMT_off) {
2450 #endif // INCLUDE_NMT
2451 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2452 PrintNMTStatistics = false;
2453 #if INCLUDE_NMT
2454 }
2455 #endif
2456 }
2457 #if INCLUDE_JVMCI
2458
2459 status = status && check_jvmci_args_consistency();
2460
2461 if (EnableJVMCI) {
2462 if (!ScavengeRootsInCode) {
2463 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2464 ScavengeRootsInCode = 1;
2465 }
2466 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2467 TypeProfileLevel = 0;
2468 }
2469 if (UseJVMCICompiler) {
2470 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2471 TypeProfileWidth = 8;
2472 }
2473 }
2474 }
2475 #endif
2476
2477 // Check lower bounds of the code cache
2478 // Template Interpreter code is approximately 3X larger in debug builds.
2479 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2480 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2481 jio_fprintf(defaultStream::error_stream(),
2482 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2483 os::vm_page_size()/K);
2484 status = false;
2485 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2488 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2489 status = false;
2490 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2493 min_code_cache_size/K);
2494 status = false;
2495 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2496 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2499 CODE_CACHE_SIZE_LIMIT/M);
2500 status = false;
2501 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2504 min_code_cache_size/K);
2505 status = false;
2506 }
2507
2508 #ifdef _LP64
2509 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2510 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2511 }
2512 #endif
2513
2514 #ifndef SUPPORT_RESERVED_STACK_AREA
2515 if (StackReservedPages != 0) {
2516 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2517 warning("Reserved Stack Area not supported on this platform");
2518 }
2519 #endif
2520
2521 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2522 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2523 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2524 }
2525 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2526 }
2527 if (UseCompiler && is_interpreter_only()) {
2528 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2529 warning("UseCompiler disabled due to -Xint.");
2530 }
2531 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2532 }
2533 #ifdef COMPILER2
2534 if (PostLoopMultiversioning && !RangeCheckElimination) {
2535 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2536 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2537 }
2538 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2539 }
2540 #endif
2541 return status;
2542 }
2543
2544 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2545 const char* option_type) {
2546 if (ignore) return false;
2547
2548 const char* spacer = " ";
2549 if (option_type == NULL) {
2550 option_type = ++spacer; // Set both to the empty string.
2551 }
2552
2553 if (os::obsolete_option(option)) {
2554 jio_fprintf(defaultStream::error_stream(),
2555 "Obsolete %s%soption: %s\n", option_type, spacer,
2556 option->optionString);
2557 return false;
2558 } else {
2559 jio_fprintf(defaultStream::error_stream(),
2560 "Unrecognized %s%soption: %s\n", option_type, spacer,
2561 option->optionString);
2562 return true;
2563 }
2564 }
2565
2566 static const char* user_assertion_options[] = {
2567 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2568 };
2569
2570 static const char* system_assertion_options[] = {
2571 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2572 };
2573
2574 bool Arguments::parse_uintx(const char* value,
2575 uintx* uintx_arg,
2576 uintx min_size) {
2577
2578 // Check the sign first since atojulong() parses only unsigned values.
2579 bool value_is_positive = !(*value == '-');
2580
2581 if (value_is_positive) {
2582 julong n;
2583 bool good_return = atojulong(value, &n);
2584 if (good_return) {
2585 bool above_minimum = n >= min_size;
2586 bool value_is_too_large = n > max_uintx;
2587
2588 if (above_minimum && !value_is_too_large) {
2589 *uintx_arg = n;
2590 return true;
2591 }
2592 }
2593 }
2594 return false;
2595 }
2596
2597 unsigned int addreads_count = 0;
2598 unsigned int addexports_count = 0;
2599 unsigned int addopens_count = 0;
2600 unsigned int addmods_count = 0;
2601 unsigned int patch_mod_count = 0;
2602
2603 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2604 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2605 char* property = AllocateHeap(prop_len, mtArguments);
2606 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2607 if (ret < 0 || ret >= (int)prop_len) {
2608 FreeHeap(property);
2609 return false;
2610 }
2611 bool added = add_property(property, UnwriteableProperty, internal);
2612 FreeHeap(property);
2613 return added;
2614 }
2615
2616 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2617 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2618 if (count < 1000) {
2619 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2620 char* property = AllocateHeap(prop_len, mtArguments);
2621 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2622 if (ret < 0 || ret >= (int)prop_len) {
2623 FreeHeap(property);
2624 return false;
2625 }
2626 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2627 FreeHeap(property);
2628 return added;
2629 }
2630 return false;
2631 }
2632
2633 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2634 julong* long_arg,
2635 julong min_size) {
2636 if (!atojulong(s, long_arg)) return arg_unreadable;
2637 return check_memory_size(*long_arg, min_size);
2638 }
2639
2640 // Parse JavaVMInitArgs structure
2641
2642 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2643 const JavaVMInitArgs *java_options_args,
2644 const JavaVMInitArgs *cmd_line_args) {
2645 bool patch_mod_javabase = false;
2646
2647 // Save default settings for some mode flags
2648 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2649 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2650 Arguments::_ClipInlining = ClipInlining;
2651 Arguments::_BackgroundCompilation = BackgroundCompilation;
2652 if (TieredCompilation) {
2653 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2654 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2655 }
2656
2657 // Setup flags for mixed which is the default
2658 set_mode_flags(_mixed);
2659
2660 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2661 // variable (if present).
2662 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2663 if (result != JNI_OK) {
2664 return result;
2665 }
2666
2667 // Parse args structure generated from the command line flags.
2668 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2669 if (result != JNI_OK) {
2670 return result;
2671 }
2672
2673 // Parse args structure generated from the _JAVA_OPTIONS environment
2674 // variable (if present) (mimics classic VM)
2675 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2676 if (result != JNI_OK) {
2677 return result;
2678 }
2679
2680 // Do final processing now that all arguments have been parsed
2681 result = finalize_vm_init_args();
2682 if (result != JNI_OK) {
2683 return result;
2684 }
2685
2686 #if INCLUDE_CDS
2687 if (UseSharedSpaces && patch_mod_javabase) {
2688 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2689 }
2690 #endif
2691
2692 return JNI_OK;
2693 }
2694
2695 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2696 // represents a valid JDWP agent. is_path==true denotes that we
2697 // are dealing with -agentpath (case where name is a path), otherwise with
2698 // -agentlib
2699 bool valid_jdwp_agent(char *name, bool is_path) {
2700 char *_name;
2701 const char *_jdwp = "jdwp";
2702 size_t _len_jdwp, _len_prefix;
2703
2704 if (is_path) {
2705 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2706 return false;
2707 }
2708
2709 _name++; // skip past last path separator
2710 _len_prefix = strlen(JNI_LIB_PREFIX);
2711
2712 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2713 return false;
2714 }
2715
2716 _name += _len_prefix;
2717 _len_jdwp = strlen(_jdwp);
2718
2719 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2720 _name += _len_jdwp;
2721 }
2722 else {
2723 return false;
2724 }
2725
2726 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2727 return false;
2728 }
2729
2730 return true;
2731 }
2732
2733 if (strcmp(name, _jdwp) == 0) {
2734 return true;
2735 }
2736
2737 return false;
2738 }
2739
2740 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2741 // --patch-module=<module>=<file>(<pathsep><file>)*
2742 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2743 // Find the equal sign between the module name and the path specification
2744 const char* module_equal = strchr(patch_mod_tail, '=');
2745 if (module_equal == NULL) {
2746 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2747 return JNI_ERR;
2748 } else {
2749 // Pick out the module name
2750 size_t module_len = module_equal - patch_mod_tail;
2751 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2752 if (module_name != NULL) {
2753 memcpy(module_name, patch_mod_tail, module_len);
2754 *(module_name + module_len) = '\0';
2755 // The path piece begins one past the module_equal sign
2756 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2757 FREE_C_HEAP_ARRAY(char, module_name);
2758 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2759 return JNI_ENOMEM;
2760 }
2761 } else {
2762 return JNI_ENOMEM;
2763 }
2764 }
2765 return JNI_OK;
2766 }
2767
2768 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2769 // For match_option to return remaining or value part of option string
2770 const char* tail;
2771
2772 // iterate over arguments
2773 for (int index = 0; index < args->nOptions; index++) {
2774 bool is_absolute_path = false; // for -agentpath vs -agentlib
2775
2776 const JavaVMOption* option = args->options + index;
2777
2778 if (!match_option(option, "-Djava.class.path", &tail) &&
2779 !match_option(option, "-Dsun.java.command", &tail) &&
2780 !match_option(option, "-Dsun.java.launcher", &tail)) {
2781
2782 // add all jvm options to the jvm_args string. This string
2783 // is used later to set the java.vm.args PerfData string constant.
2784 // the -Djava.class.path and the -Dsun.java.command options are
2785 // omitted from jvm_args string as each have their own PerfData
2786 // string constant object.
2787 build_jvm_args(option->optionString);
2788 }
2789
2790 // -verbose:[class/gc/jni]
2791 if (match_option(option, "-verbose", &tail)) {
2792 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2793 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2794 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2795 } else if (!strcmp(tail, ":gc")) {
2796 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2797 } else if (!strcmp(tail, ":jni")) {
2798 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 }
2802 // -da / -ea / -disableassertions / -enableassertions
2803 // These accept an optional class/package name separated by a colon, e.g.,
2804 // -da:java.lang.Thread.
2805 } else if (match_option(option, user_assertion_options, &tail, true)) {
2806 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2807 if (*tail == '\0') {
2808 JavaAssertions::setUserClassDefault(enable);
2809 } else {
2810 assert(*tail == ':', "bogus match by match_option()");
2811 JavaAssertions::addOption(tail + 1, enable);
2812 }
2813 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2814 } else if (match_option(option, system_assertion_options, &tail, false)) {
2815 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2816 JavaAssertions::setSystemClassDefault(enable);
2817 // -bootclasspath:
2818 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2819 jio_fprintf(defaultStream::output_stream(),
2820 "-Xbootclasspath is no longer a supported option.\n");
2821 return JNI_EINVAL;
2822 // -bootclasspath/a:
2823 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2824 Arguments::append_sysclasspath(tail);
2825 // -bootclasspath/p:
2826 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2827 jio_fprintf(defaultStream::output_stream(),
2828 "-Xbootclasspath/p is no longer a supported option.\n");
2829 return JNI_EINVAL;
2830 // -Xrun
2831 } else if (match_option(option, "-Xrun", &tail)) {
2832 if (tail != NULL) {
2833 const char* pos = strchr(tail, ':');
2834 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2835 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2836 jio_snprintf(name, len + 1, "%s", tail);
2837
2838 char *options = NULL;
2839 if(pos != NULL) {
2840 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2841 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2842 }
2843 #if !INCLUDE_JVMTI
2844 if (strcmp(name, "jdwp") == 0) {
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Debugging agents are not supported in this VM\n");
2847 return JNI_ERR;
2848 }
2849 #endif // !INCLUDE_JVMTI
2850 add_init_library(name, options);
2851 }
2852 } else if (match_option(option, "--add-reads=", &tail)) {
2853 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2854 return JNI_ENOMEM;
2855 }
2856 } else if (match_option(option, "--add-exports=", &tail)) {
2857 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2858 return JNI_ENOMEM;
2859 }
2860 } else if (match_option(option, "--add-opens=", &tail)) {
2861 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2862 return JNI_ENOMEM;
2863 }
2864 } else if (match_option(option, "--add-modules=", &tail)) {
2865 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2866 return JNI_ENOMEM;
2867 }
2868 } else if (match_option(option, "--limit-modules=", &tail)) {
2869 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2870 return JNI_ENOMEM;
2871 }
2872 } else if (match_option(option, "--module-path=", &tail)) {
2873 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2874 return JNI_ENOMEM;
2875 }
2876 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2877 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2878 return JNI_ENOMEM;
2879 }
2880 } else if (match_option(option, "--patch-module=", &tail)) {
2881 // --patch-module=<module>=<file>(<pathsep><file>)*
2882 int res = process_patch_mod_option(tail, patch_mod_javabase);
2883 if (res != JNI_OK) {
2884 return res;
2885 }
2886 // -agentlib and -agentpath
2887 } else if (match_option(option, "-agentlib:", &tail) ||
2888 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2889 if(tail != NULL) {
2890 const char* pos = strchr(tail, '=');
2891 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2892 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2893 name[len] = '\0';
2894
2895 char *options = NULL;
2896 if(pos != NULL) {
2897 options = os::strdup_check_oom(pos + 1, mtArguments);
2898 }
2899 #if !INCLUDE_JVMTI
2900 if (valid_jdwp_agent(name, is_absolute_path)) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Debugging agents are not supported in this VM\n");
2903 return JNI_ERR;
2904 }
2905 #endif // !INCLUDE_JVMTI
2906 add_init_agent(name, options, is_absolute_path);
2907 }
2908 // -javaagent
2909 } else if (match_option(option, "-javaagent:", &tail)) {
2910 #if !INCLUDE_JVMTI
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Instrumentation agents are not supported in this VM\n");
2913 return JNI_ERR;
2914 #else
2915 if (tail != NULL) {
2916 size_t length = strlen(tail) + 1;
2917 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2918 jio_snprintf(options, length, "%s", tail);
2919 add_init_agent("instrument", options, false);
2920 // java agents need module java.instrument
2921 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2922 return JNI_ENOMEM;
2923 }
2924 }
2925 #endif // !INCLUDE_JVMTI
2926 // -Xnoclassgc
2927 } else if (match_option(option, "-Xnoclassgc")) {
2928 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 // -Xconcgc
2932 } else if (match_option(option, "-Xconcgc")) {
2933 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2937 // -Xnoconcgc
2938 } else if (match_option(option, "-Xnoconcgc")) {
2939 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2943 // -Xbatch
2944 } else if (match_option(option, "-Xbatch")) {
2945 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 // -Xmn for compatibility with other JVM vendors
2949 } else if (match_option(option, "-Xmn", &tail)) {
2950 julong long_initial_young_size = 0;
2951 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2952 if (errcode != arg_in_range) {
2953 jio_fprintf(defaultStream::error_stream(),
2954 "Invalid initial young generation size: %s\n", option->optionString);
2955 describe_range_error(errcode);
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 // -Xms
2965 } else if (match_option(option, "-Xms", &tail)) {
2966 julong long_initial_heap_size = 0;
2967 // an initial heap size of 0 means automatically determine
2968 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2969 if (errcode != arg_in_range) {
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Invalid initial heap size: %s\n", option->optionString);
2972 describe_range_error(errcode);
2973 return JNI_EINVAL;
2974 }
2975 set_min_heap_size((size_t)long_initial_heap_size);
2976 // Currently the minimum size and the initial heap sizes are the same.
2977 // Can be overridden with -XX:InitialHeapSize.
2978 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 // -Xmx
2982 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2983 julong long_max_heap_size = 0;
2984 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2985 if (errcode != arg_in_range) {
2986 jio_fprintf(defaultStream::error_stream(),
2987 "Invalid maximum heap size: %s\n", option->optionString);
2988 describe_range_error(errcode);
2989 return JNI_EINVAL;
2990 }
2991 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 // Xmaxf
2995 } else if (match_option(option, "-Xmaxf", &tail)) {
2996 char* err;
2997 int maxf = (int)(strtod(tail, &err) * 100);
2998 if (*err != '\0' || *tail == '\0') {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "Bad max heap free percentage size: %s\n",
3001 option->optionString);
3002 return JNI_EINVAL;
3003 } else {
3004 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 }
3008 // Xminf
3009 } else if (match_option(option, "-Xminf", &tail)) {
3010 char* err;
3011 int minf = (int)(strtod(tail, &err) * 100);
3012 if (*err != '\0' || *tail == '\0') {
3013 jio_fprintf(defaultStream::error_stream(),
3014 "Bad min heap free percentage size: %s\n",
3015 option->optionString);
3016 return JNI_EINVAL;
3017 } else {
3018 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3019 return JNI_EINVAL;
3020 }
3021 }
3022 // -Xss
3023 } else if (match_option(option, "-Xss", &tail)) {
3024 julong long_ThreadStackSize = 0;
3025 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3026 if (errcode != arg_in_range) {
3027 jio_fprintf(defaultStream::error_stream(),
3028 "Invalid thread stack size: %s\n", option->optionString);
3029 describe_range_error(errcode);
3030 return JNI_EINVAL;
3031 }
3032 // Internally track ThreadStackSize in units of 1024 bytes.
3033 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3034 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3038 } else if (match_option(option, "-Xoss", &tail) ||
3039 match_option(option, "-Xsqnopause") ||
3040 match_option(option, "-Xoptimize") ||
3041 match_option(option, "-Xboundthreads") ||
3042 match_option(option, "-Xusealtsigs")) {
3043 // All these options are deprecated in JDK 9 and will be removed in a future release
3044 char version[256];
3045 JDK_Version::jdk(9).to_string(version, sizeof(version));
3046 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3047 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3048 julong long_CodeCacheExpansionSize = 0;
3049 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3050 if (errcode != arg_in_range) {
3051 jio_fprintf(defaultStream::error_stream(),
3052 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3053 os::vm_page_size()/K);
3054 return JNI_EINVAL;
3055 }
3056 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3057 return JNI_EINVAL;
3058 }
3059 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3060 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3061 julong long_ReservedCodeCacheSize = 0;
3062
3063 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3064 if (errcode != arg_in_range) {
3065 jio_fprintf(defaultStream::error_stream(),
3066 "Invalid maximum code cache size: %s.\n", option->optionString);
3067 return JNI_EINVAL;
3068 }
3069 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 // -XX:NonNMethodCodeHeapSize=
3073 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3074 julong long_NonNMethodCodeHeapSize = 0;
3075
3076 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3077 if (errcode != arg_in_range) {
3078 jio_fprintf(defaultStream::error_stream(),
3079 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3080 return JNI_EINVAL;
3081 }
3082 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3083 return JNI_EINVAL;
3084 }
3085 // -XX:ProfiledCodeHeapSize=
3086 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3087 julong long_ProfiledCodeHeapSize = 0;
3088
3089 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3090 if (errcode != arg_in_range) {
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3093 return JNI_EINVAL;
3094 }
3095 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 // -XX:NonProfiledCodeHeapSizee=
3099 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3100 julong long_NonProfiledCodeHeapSize = 0;
3101
3102 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3106 return JNI_EINVAL;
3107 }
3108 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3109 return JNI_EINVAL;
3110 }
3111 // -green
3112 } else if (match_option(option, "-green")) {
3113 jio_fprintf(defaultStream::error_stream(),
3114 "Green threads support not available\n");
3115 return JNI_EINVAL;
3116 // -native
3117 } else if (match_option(option, "-native")) {
3118 // HotSpot always uses native threads, ignore silently for compatibility
3119 // -Xrs
3120 } else if (match_option(option, "-Xrs")) {
3121 // Classic/EVM option, new functionality
3122 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3123 return JNI_EINVAL;
3124 }
3125 // -Xprof
3126 } else if (match_option(option, "-Xprof")) {
3127 #if INCLUDE_FPROF
3128 _has_profile = true;
3129 #else // INCLUDE_FPROF
3130 jio_fprintf(defaultStream::error_stream(),
3131 "Flat profiling is not supported in this VM.\n");
3132 return JNI_ERR;
3133 #endif // INCLUDE_FPROF
3134 // -Xconcurrentio
3135 } else if (match_option(option, "-Xconcurrentio")) {
3136 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3149 return JNI_EINVAL;
3150 }
3151
3152 // -Xinternalversion
3153 } else if (match_option(option, "-Xinternalversion")) {
3154 jio_fprintf(defaultStream::output_stream(), "%s\n",
3155 VM_Version::internal_vm_info_string());
3156 vm_exit(0);
3157 #ifndef PRODUCT
3158 // -Xprintflags
3159 } else if (match_option(option, "-Xprintflags")) {
3160 CommandLineFlags::printFlags(tty, false);
3161 vm_exit(0);
3162 #endif
3163 // -D
3164 } else if (match_option(option, "-D", &tail)) {
3165 const char* value;
3166 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3167 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3168 // abort if -Djava.endorsed.dirs is set
3169 jio_fprintf(defaultStream::output_stream(),
3170 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3171 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3172 return JNI_EINVAL;
3173 }
3174 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3175 *value != '\0' && strcmp(value, "\"\"") != 0) {
3176 // abort if -Djava.ext.dirs is set
3177 jio_fprintf(defaultStream::output_stream(),
3178 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3179 return JNI_EINVAL;
3180 }
3181 // Check for module related properties. They must be set using the modules
3182 // options. For example: use "--add-modules=java.sql", not
3183 // "-Djdk.module.addmods=java.sql"
3184 if (is_internal_module_property(option->optionString + 2)) {
3185 needs_module_property_warning = true;
3186 continue;
3187 }
3188
3189 if (!add_property(tail)) {
3190 return JNI_ENOMEM;
3191 }
3192 // Out of the box management support
3193 if (match_option(option, "-Dcom.sun.management", &tail)) {
3194 #if INCLUDE_MANAGEMENT
3195 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 // management agent in module java.management
3199 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3200 return JNI_ENOMEM;
3201 }
3202 #else
3203 jio_fprintf(defaultStream::output_stream(),
3204 "-Dcom.sun.management is not supported in this VM.\n");
3205 return JNI_ERR;
3206 #endif
3207 }
3208 // -Xint
3209 } else if (match_option(option, "-Xint")) {
3210 set_mode_flags(_int);
3211 // -Xmixed
3212 } else if (match_option(option, "-Xmixed")) {
3213 set_mode_flags(_mixed);
3214 // -Xcomp
3215 } else if (match_option(option, "-Xcomp")) {
3216 // for testing the compiler; turn off all flags that inhibit compilation
3217 set_mode_flags(_comp);
3218 // -Xshare:dump
3219 } else if (match_option(option, "-Xshare:dump")) {
3220 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3221 return JNI_EINVAL;
3222 }
3223 set_mode_flags(_int); // Prevent compilation, which creates objects
3224 // -Xshare:on
3225 } else if (match_option(option, "-Xshare:on")) {
3226 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3227 return JNI_EINVAL;
3228 }
3229 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3230 return JNI_EINVAL;
3231 }
3232 // -Xshare:auto
3233 } else if (match_option(option, "-Xshare:auto")) {
3234 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3235 return JNI_EINVAL;
3236 }
3237 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3238 return JNI_EINVAL;
3239 }
3240 // -Xshare:off
3241 } else if (match_option(option, "-Xshare:off")) {
3242 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3243 return JNI_EINVAL;
3244 }
3245 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3246 return JNI_EINVAL;
3247 }
3248 // -Xverify
3249 } else if (match_option(option, "-Xverify", &tail)) {
3250 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3251 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3255 return JNI_EINVAL;
3256 }
3257 } else if (strcmp(tail, ":remote") == 0) {
3258 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3259 return JNI_EINVAL;
3260 }
3261 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3262 return JNI_EINVAL;
3263 }
3264 } else if (strcmp(tail, ":none") == 0) {
3265 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3266 return JNI_EINVAL;
3267 }
3268 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3269 return JNI_EINVAL;
3270 }
3271 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3272 return JNI_EINVAL;
3273 }
3274 // -Xdebug
3275 } else if (match_option(option, "-Xdebug")) {
3276 // note this flag has been used, then ignore
3277 set_xdebug_mode(true);
3278 // -Xnoagent
3279 } else if (match_option(option, "-Xnoagent")) {
3280 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3281 } else if (match_option(option, "-Xloggc:", &tail)) {
3282 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3283 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3284 _gc_log_filename = os::strdup_check_oom(tail);
3285 } else if (match_option(option, "-Xlog", &tail)) {
3286 bool ret = false;
3287 if (strcmp(tail, ":help") == 0) {
3288 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3289 vm_exit(0);
3290 } else if (strcmp(tail, ":disable") == 0) {
3291 LogConfiguration::disable_logging();
3292 ret = true;
3293 } else if (*tail == '\0') {
3294 ret = LogConfiguration::parse_command_line_arguments();
3295 assert(ret, "-Xlog without arguments should never fail to parse");
3296 } else if (*tail == ':') {
3297 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3298 }
3299 if (ret == false) {
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Invalid -Xlog option '-Xlog%s'\n",
3302 tail);
3303 return JNI_EINVAL;
3304 }
3305 // JNI hooks
3306 } else if (match_option(option, "-Xcheck", &tail)) {
3307 if (!strcmp(tail, ":jni")) {
3308 #if !INCLUDE_JNI_CHECK
3309 warning("JNI CHECKING is not supported in this VM");
3310 #else
3311 CheckJNICalls = true;
3312 #endif // INCLUDE_JNI_CHECK
3313 } else if (is_bad_option(option, args->ignoreUnrecognized,
3314 "check")) {
3315 return JNI_EINVAL;
3316 }
3317 } else if (match_option(option, "vfprintf")) {
3318 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3319 } else if (match_option(option, "exit")) {
3320 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3321 } else if (match_option(option, "abort")) {
3322 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3323 // -XX:+AggressiveHeap
3324 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3325 jint result = set_aggressive_heap_flags();
3326 if (result != JNI_OK) {
3327 return result;
3328 }
3329 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3330 // and the last option wins.
3331 } else if (match_option(option, "-XX:+NeverTenure")) {
3332 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3336 return JNI_EINVAL;
3337 }
3338 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3342 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3343 return JNI_EINVAL;
3344 }
3345 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3346 return JNI_EINVAL;
3347 }
3348 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3349 return JNI_EINVAL;
3350 }
3351 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3352 uintx max_tenuring_thresh = 0;
3353 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3354 jio_fprintf(defaultStream::error_stream(),
3355 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3356 return JNI_EINVAL;
3357 }
3358
3359 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3360 return JNI_EINVAL;
3361 }
3362
3363 if (MaxTenuringThreshold == 0) {
3364 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3365 return JNI_EINVAL;
3366 }
3367 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3368 return JNI_EINVAL;
3369 }
3370 } else {
3371 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 }
3378 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3379 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3380 return JNI_EINVAL;
3381 }
3382 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3386 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3387 return JNI_EINVAL;
3388 }
3389 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3390 return JNI_EINVAL;
3391 }
3392 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3393 #if defined(DTRACE_ENABLED)
3394 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3395 return JNI_EINVAL;
3396 }
3397 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3398 return JNI_EINVAL;
3399 }
3400 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3401 return JNI_EINVAL;
3402 }
3403 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3404 return JNI_EINVAL;
3405 }
3406 #else // defined(DTRACE_ENABLED)
3407 jio_fprintf(defaultStream::error_stream(),
3408 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3409 return JNI_EINVAL;
3410 #endif // defined(DTRACE_ENABLED)
3411 #ifdef ASSERT
3412 } else if (match_option(option, "-XX:+FullGCALot")) {
3413 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3414 return JNI_EINVAL;
3415 }
3416 // disable scavenge before parallel mark-compact
3417 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3418 return JNI_EINVAL;
3419 }
3420 #endif
3421 #if !INCLUDE_MANAGEMENT
3422 } else if (match_option(option, "-XX:+ManagementServer")) {
3423 jio_fprintf(defaultStream::error_stream(),
3424 "ManagementServer is not supported in this VM.\n");
3425 return JNI_ERR;
3426 #endif // INCLUDE_MANAGEMENT
3427 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3428 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3429 // already been handled
3430 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3431 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3432 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3433 return JNI_EINVAL;
3434 }
3435 }
3436 // Unknown option
3437 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3438 return JNI_ERR;
3439 }
3440 }
3441
3442 // PrintSharedArchiveAndExit will turn on
3443 // -Xshare:on
3444 // -Xlog:class+path=info
3445 if (PrintSharedArchiveAndExit) {
3446 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3447 return JNI_EINVAL;
3448 }
3449 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3450 return JNI_EINVAL;
3451 }
3452 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3453 }
3454
3455 // Change the default value for flags which have different default values
3456 // when working with older JDKs.
3457 #ifdef LINUX
3458 if (JDK_Version::current().compare_major(6) <= 0 &&
3459 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3460 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3461 }
3462 #endif // LINUX
3463 fix_appclasspath();
3464 return JNI_OK;
3465 }
3466
3467 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3468 // For java.base check for duplicate --patch-module options being specified on the command line.
3469 // This check is only required for java.base, all other duplicate module specifications
3470 // will be checked during module system initialization. The module system initialization
3471 // will throw an ExceptionInInitializerError if this situation occurs.
3472 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3473 if (*patch_mod_javabase) {
3474 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3475 } else {
3476 *patch_mod_javabase = true;
3477 }
3478 }
3479
3480 // Create GrowableArray lazily, only if --patch-module has been specified
3481 if (_patch_mod_prefix == NULL) {
3482 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3483 }
3484
3485 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3486 }
3487
3488 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3489 //
3490 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3491 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3492 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3493 // path is treated as the current directory.
3494 //
3495 // This causes problems with CDS, which requires that all directories specified in the classpath
3496 // must be empty. In most cases, applications do NOT want to load classes from the current
3497 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3498 // scripts compatible with CDS.
3499 void Arguments::fix_appclasspath() {
3500 if (IgnoreEmptyClassPaths) {
3501 const char separator = *os::path_separator();
3502 const char* src = _java_class_path->value();
3503
3504 // skip over all the leading empty paths
3505 while (*src == separator) {
3506 src ++;
3507 }
3508
3509 char* copy = os::strdup_check_oom(src, mtArguments);
3510
3511 // trim all trailing empty paths
3512 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3513 *tail = '\0';
3514 }
3515
3516 char from[3] = {separator, separator, '\0'};
3517 char to [2] = {separator, '\0'};
3518 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3519 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3520 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3521 }
3522
3523 _java_class_path->set_writeable_value(copy);
3524 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3525 }
3526 }
3527
3528 static bool has_jar_files(const char* directory) {
3529 DIR* dir = os::opendir(directory);
3530 if (dir == NULL) return false;
3531
3532 struct dirent *entry;
3533 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3534 bool hasJarFile = false;
3535 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3536 const char* name = entry->d_name;
3537 const char* ext = name + strlen(name) - 4;
3538 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3539 }
3540 FREE_C_HEAP_ARRAY(char, dbuf);
3541 os::closedir(dir);
3542 return hasJarFile ;
3543 }
3544
3545 static int check_non_empty_dirs(const char* path) {
3546 const char separator = *os::path_separator();
3547 const char* const end = path + strlen(path);
3548 int nonEmptyDirs = 0;
3549 while (path < end) {
3550 const char* tmp_end = strchr(path, separator);
3551 if (tmp_end == NULL) {
3552 if (has_jar_files(path)) {
3553 nonEmptyDirs++;
3554 jio_fprintf(defaultStream::output_stream(),
3555 "Non-empty directory: %s\n", path);
3556 }
3557 path = end;
3558 } else {
3559 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3560 memcpy(dirpath, path, tmp_end - path);
3561 dirpath[tmp_end - path] = '\0';
3562 if (has_jar_files(dirpath)) {
3563 nonEmptyDirs++;
3564 jio_fprintf(defaultStream::output_stream(),
3565 "Non-empty directory: %s\n", dirpath);
3566 }
3567 FREE_C_HEAP_ARRAY(char, dirpath);
3568 path = tmp_end + 1;
3569 }
3570 }
3571 return nonEmptyDirs;
3572 }
3573
3574 jint Arguments::finalize_vm_init_args() {
3575 // check if the default lib/endorsed directory exists; if so, error
3576 char path[JVM_MAXPATHLEN];
3577 const char* fileSep = os::file_separator();
3578 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3579
3580 if (CheckEndorsedAndExtDirs) {
3581 int nonEmptyDirs = 0;
3582 // check endorsed directory
3583 nonEmptyDirs += check_non_empty_dirs(path);
3584 // check the extension directories
3585 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3586 if (nonEmptyDirs > 0) {
3587 return JNI_ERR;
3588 }
3589 }
3590
3591 DIR* dir = os::opendir(path);
3592 if (dir != NULL) {
3593 jio_fprintf(defaultStream::output_stream(),
3594 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3595 "in modular form will be supported via the concept of upgradeable modules.\n");
3596 os::closedir(dir);
3597 return JNI_ERR;
3598 }
3599
3600 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3601 dir = os::opendir(path);
3602 if (dir != NULL) {
3603 jio_fprintf(defaultStream::output_stream(),
3604 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3605 "Use -classpath instead.\n.");
3606 os::closedir(dir);
3607 return JNI_ERR;
3608 }
3609
3610 // This must be done after all arguments have been processed.
3611 // java_compiler() true means set to "NONE" or empty.
3612 if (java_compiler() && !xdebug_mode()) {
3613 // For backwards compatibility, we switch to interpreted mode if
3614 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3615 // not specified.
3616 set_mode_flags(_int);
3617 }
3618
3619 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3620 // but like -Xint, leave compilation thresholds unaffected.
3621 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3622 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3623 set_mode_flags(_int);
3624 }
3625
3626 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3627 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3628 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3629 }
3630
3631 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3632 // Don't degrade server performance for footprint
3633 if (FLAG_IS_DEFAULT(UseLargePages) &&
3634 MaxHeapSize < LargePageHeapSizeThreshold) {
3635 // No need for large granularity pages w/small heaps.
3636 // Note that large pages are enabled/disabled for both the
3637 // Java heap and the code cache.
3638 FLAG_SET_DEFAULT(UseLargePages, false);
3639 }
3640
3641 #elif defined(COMPILER2)
3642 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3643 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3644 }
3645 #endif
3646
3647 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3648 UNSUPPORTED_OPTION(ProfileInterpreter);
3649 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3650 #endif
3651
3652 #ifndef TIERED
3653 // Tiered compilation is undefined.
3654 UNSUPPORTED_OPTION(TieredCompilation);
3655 #endif
3656
3657 #if INCLUDE_JVMCI
3658 if (EnableJVMCI &&
3659 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3660 return JNI_ENOMEM;
3661 }
3662 #endif
3663
3664 // If we are running in a headless jre, force java.awt.headless property
3665 // to be true unless the property has already been set.
3666 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3667 if (os::is_headless_jre()) {
3668 const char* headless = Arguments::get_property("java.awt.headless");
3669 if (headless == NULL) {
3670 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3671 if (headless_env == NULL) {
3672 if (!add_property("java.awt.headless=true")) {
3673 return JNI_ENOMEM;
3674 }
3675 } else {
3676 char buffer[256];
3677 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3678 if (!add_property(buffer)) {
3679 return JNI_ENOMEM;
3680 }
3681 }
3682 }
3683 }
3684
3685 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3686 // CMS can only be used with ParNew
3687 FLAG_SET_ERGO(bool, UseParNewGC, true);
3688 }
3689
3690 if (!check_vm_args_consistency()) {
3691 return JNI_ERR;
3692 }
3693
3694 return JNI_OK;
3695 }
3696
3697 // Helper class for controlling the lifetime of JavaVMInitArgs
3698 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3699 // deleted on the destruction of the ScopedVMInitArgs object.
3700 class ScopedVMInitArgs : public StackObj {
3701 private:
3702 JavaVMInitArgs _args;
3703 char* _container_name;
3704 bool _is_set;
3705 char* _vm_options_file_arg;
3706
3707 public:
3708 ScopedVMInitArgs(const char *container_name) {
3709 _args.version = JNI_VERSION_1_2;
3710 _args.nOptions = 0;
3711 _args.options = NULL;
3712 _args.ignoreUnrecognized = false;
3713 _container_name = (char *)container_name;
3714 _is_set = false;
3715 _vm_options_file_arg = NULL;
3716 }
3717
3718 // Populates the JavaVMInitArgs object represented by this
3719 // ScopedVMInitArgs object with the arguments in options. The
3720 // allocated memory is deleted by the destructor. If this method
3721 // returns anything other than JNI_OK, then this object is in a
3722 // partially constructed state, and should be abandoned.
3723 jint set_args(GrowableArray<JavaVMOption>* options) {
3724 _is_set = true;
3725 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3726 JavaVMOption, options->length(), mtArguments);
3727 if (options_arr == NULL) {
3728 return JNI_ENOMEM;
3729 }
3730 _args.options = options_arr;
3731
3732 for (int i = 0; i < options->length(); i++) {
3733 options_arr[i] = options->at(i);
3734 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3735 if (options_arr[i].optionString == NULL) {
3736 // Rely on the destructor to do cleanup.
3737 _args.nOptions = i;
3738 return JNI_ENOMEM;
3739 }
3740 }
3741
3742 _args.nOptions = options->length();
3743 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3744 return JNI_OK;
3745 }
3746
3747 JavaVMInitArgs* get() { return &_args; }
3748 char* container_name() { return _container_name; }
3749 bool is_set() { return _is_set; }
3750 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3751 char* vm_options_file_arg() { return _vm_options_file_arg; }
3752
3753 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3754 if (_vm_options_file_arg != NULL) {
3755 os::free(_vm_options_file_arg);
3756 }
3757 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3758 }
3759
3760 ~ScopedVMInitArgs() {
3761 if (_vm_options_file_arg != NULL) {
3762 os::free(_vm_options_file_arg);
3763 }
3764 if (_args.options == NULL) return;
3765 for (int i = 0; i < _args.nOptions; i++) {
3766 os::free(_args.options[i].optionString);
3767 }
3768 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3769 }
3770
3771 // Insert options into this option list, to replace option at
3772 // vm_options_file_pos (-XX:VMOptionsFile)
3773 jint insert(const JavaVMInitArgs* args,
3774 const JavaVMInitArgs* args_to_insert,
3775 const int vm_options_file_pos) {
3776 assert(_args.options == NULL, "shouldn't be set yet");
3777 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3778 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3779
3780 int length = args->nOptions + args_to_insert->nOptions - 1;
3781 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3782 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3783 for (int i = 0; i < args->nOptions; i++) {
3784 if (i == vm_options_file_pos) {
3785 // insert the new options starting at the same place as the
3786 // -XX:VMOptionsFile option
3787 for (int j = 0; j < args_to_insert->nOptions; j++) {
3788 options->push(args_to_insert->options[j]);
3789 }
3790 } else {
3791 options->push(args->options[i]);
3792 }
3793 }
3794 // make into options array
3795 jint result = set_args(options);
3796 delete options;
3797 return result;
3798 }
3799 };
3800
3801 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3802 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3803 }
3804
3805 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3806 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3807 }
3808
3809 jint Arguments::parse_options_environment_variable(const char* name,
3810 ScopedVMInitArgs* vm_args) {
3811 char *buffer = ::getenv(name);
3812
3813 // Don't check this environment variable if user has special privileges
3814 // (e.g. unix su command).
3815 if (buffer == NULL || os::have_special_privileges()) {
3816 return JNI_OK;
3817 }
3818
3819 if ((buffer = os::strdup(buffer)) == NULL) {
3820 return JNI_ENOMEM;
3821 }
3822
3823 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3824
3825 os::free(buffer);
3826 return retcode;
3827 }
3828
3829 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3830 // read file into buffer
3831 int fd = ::open(file_name, O_RDONLY);
3832 if (fd < 0) {
3833 jio_fprintf(defaultStream::error_stream(),
3834 "Could not open options file '%s'\n",
3835 file_name);
3836 return JNI_ERR;
3837 }
3838
3839 struct stat stbuf;
3840 int retcode = os::stat(file_name, &stbuf);
3841 if (retcode != 0) {
3842 jio_fprintf(defaultStream::error_stream(),
3843 "Could not stat options file '%s'\n",
3844 file_name);
3845 os::close(fd);
3846 return JNI_ERR;
3847 }
3848
3849 if (stbuf.st_size == 0) {
3850 // tell caller there is no option data and that is ok
3851 os::close(fd);
3852 return JNI_OK;
3853 }
3854
3855 // '+ 1' for NULL termination even with max bytes
3856 size_t bytes_alloc = stbuf.st_size + 1;
3857
3858 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3859 if (NULL == buf) {
3860 jio_fprintf(defaultStream::error_stream(),
3861 "Could not allocate read buffer for options file parse\n");
3862 os::close(fd);
3863 return JNI_ENOMEM;
3864 }
3865
3866 memset(buf, 0, bytes_alloc);
3867
3868 // Fill buffer
3869 // Use ::read() instead of os::read because os::read()
3870 // might do a thread state transition
3871 // and it is too early for that here
3872
3873 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3874 os::close(fd);
3875 if (bytes_read < 0) {
3876 FREE_C_HEAP_ARRAY(char, buf);
3877 jio_fprintf(defaultStream::error_stream(),
3878 "Could not read options file '%s'\n", file_name);
3879 return JNI_ERR;
3880 }
3881
3882 if (bytes_read == 0) {
3883 // tell caller there is no option data and that is ok
3884 FREE_C_HEAP_ARRAY(char, buf);
3885 return JNI_OK;
3886 }
3887
3888 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3889
3890 FREE_C_HEAP_ARRAY(char, buf);
3891 return retcode;
3892 }
3893
3894 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3895 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3896
3897 // some pointers to help with parsing
3898 char *buffer_end = buffer + buf_len;
3899 char *opt_hd = buffer;
3900 char *wrt = buffer;
3901 char *rd = buffer;
3902
3903 // parse all options
3904 while (rd < buffer_end) {
3905 // skip leading white space from the input string
3906 while (rd < buffer_end && isspace(*rd)) {
3907 rd++;
3908 }
3909
3910 if (rd >= buffer_end) {
3911 break;
3912 }
3913
3914 // Remember this is where we found the head of the token.
3915 opt_hd = wrt;
3916
3917 // Tokens are strings of non white space characters separated
3918 // by one or more white spaces.
3919 while (rd < buffer_end && !isspace(*rd)) {
3920 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3921 int quote = *rd; // matching quote to look for
3922 rd++; // don't copy open quote
3923 while (rd < buffer_end && *rd != quote) {
3924 // include everything (even spaces)
3925 // up until the close quote
3926 *wrt++ = *rd++; // copy to option string
3927 }
3928
3929 if (rd < buffer_end) {
3930 rd++; // don't copy close quote
3931 } else {
3932 // did not see closing quote
3933 jio_fprintf(defaultStream::error_stream(),
3934 "Unmatched quote in %s\n", name);
3935 delete options;
3936 return JNI_ERR;
3937 }
3938 } else {
3939 *wrt++ = *rd++; // copy to option string
3940 }
3941 }
3942
3943 // steal a white space character and set it to NULL
3944 *wrt++ = '\0';
3945 // We now have a complete token
3946
3947 JavaVMOption option;
3948 option.optionString = opt_hd;
3949 option.extraInfo = NULL;
3950
3951 options->append(option); // Fill in option
3952
3953 rd++; // Advance to next character
3954 }
3955
3956 // Fill out JavaVMInitArgs structure.
3957 jint status = vm_args->set_args(options);
3958
3959 delete options;
3960 return status;
3961 }
3962
3963 void Arguments::set_shared_spaces_flags() {
3964 if (DumpSharedSpaces) {
3965 if (FailOverToOldVerifier) {
3966 // Don't fall back to the old verifier on verification failure. If a
3967 // class fails verification with the split verifier, it might fail the
3968 // CDS runtime verifier constraint check. In that case, we don't want
3969 // to share the class. We only archive classes that pass the split verifier.
3970 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3971 }
3972
3973 if (RequireSharedSpaces) {
3974 warning("Cannot dump shared archive while using shared archive");
3975 }
3976 UseSharedSpaces = false;
3977 #ifdef _LP64
3978 if (!UseCompressedOops || !UseCompressedClassPointers) {
3979 vm_exit_during_initialization(
3980 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3981 }
3982 } else {
3983 if (!UseCompressedOops || !UseCompressedClassPointers) {
3984 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3985 }
3986 #endif
3987 }
3988 }
3989
3990 // Sharing support
3991 // Construct the path to the archive
3992 static char* get_shared_archive_path() {
3993 char *shared_archive_path;
3994 if (SharedArchiveFile == NULL) {
3995 char jvm_path[JVM_MAXPATHLEN];
3996 os::jvm_path(jvm_path, sizeof(jvm_path));
3997 char *end = strrchr(jvm_path, *os::file_separator());
3998 if (end != NULL) *end = '\0';
3999 size_t jvm_path_len = strlen(jvm_path);
4000 size_t file_sep_len = strlen(os::file_separator());
4001 const size_t len = jvm_path_len + file_sep_len + 20;
4002 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4003 if (shared_archive_path != NULL) {
4004 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4005 jvm_path, os::file_separator());
4006 }
4007 } else {
4008 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4009 }
4010 return shared_archive_path;
4011 }
4012
4013 #ifndef PRODUCT
4014 // Determine whether LogVMOutput should be implicitly turned on.
4015 static bool use_vm_log() {
4016 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4017 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4018 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4019 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4020 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4021 return true;
4022 }
4023
4024 #ifdef COMPILER1
4025 if (PrintC1Statistics) {
4026 return true;
4027 }
4028 #endif // COMPILER1
4029
4030 #ifdef COMPILER2
4031 if (PrintOptoAssembly || PrintOptoStatistics) {
4032 return true;
4033 }
4034 #endif // COMPILER2
4035
4036 return false;
4037 }
4038
4039 #endif // PRODUCT
4040
4041 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4042 for (int index = 0; index < args->nOptions; index++) {
4043 const JavaVMOption* option = args->options + index;
4044 const char* tail;
4045 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4046 return true;
4047 }
4048 }
4049 return false;
4050 }
4051
4052 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4053 const char* vm_options_file,
4054 const int vm_options_file_pos,
4055 ScopedVMInitArgs* vm_options_file_args,
4056 ScopedVMInitArgs* args_out) {
4057 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4058 if (code != JNI_OK) {
4059 return code;
4060 }
4061
4062 if (vm_options_file_args->get()->nOptions < 1) {
4063 return JNI_OK;
4064 }
4065
4066 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4067 jio_fprintf(defaultStream::error_stream(),
4068 "A VM options file may not refer to a VM options file. "
4069 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4070 "options file '%s' in options container '%s' is an error.\n",
4071 vm_options_file_args->vm_options_file_arg(),
4072 vm_options_file_args->container_name());
4073 return JNI_EINVAL;
4074 }
4075
4076 return args_out->insert(args, vm_options_file_args->get(),
4077 vm_options_file_pos);
4078 }
4079
4080 // Expand -XX:VMOptionsFile found in args_in as needed.
4081 // mod_args and args_out parameters may return values as needed.
4082 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4083 ScopedVMInitArgs* mod_args,
4084 JavaVMInitArgs** args_out) {
4085 jint code = match_special_option_and_act(args_in, mod_args);
4086 if (code != JNI_OK) {
4087 return code;
4088 }
4089
4090 if (mod_args->is_set()) {
4091 // args_in contains -XX:VMOptionsFile and mod_args contains the
4092 // original options from args_in along with the options expanded
4093 // from the VMOptionsFile. Return a short-hand to the caller.
4094 *args_out = mod_args->get();
4095 } else {
4096 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4097 }
4098 return JNI_OK;
4099 }
4100
4101 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4102 ScopedVMInitArgs* args_out) {
4103 // Remaining part of option string
4104 const char* tail;
4105 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4106
4107 for (int index = 0; index < args->nOptions; index++) {
4108 const JavaVMOption* option = args->options + index;
4109 if (ArgumentsExt::process_options(option)) {
4110 continue;
4111 }
4112 if (match_option(option, "-XX:Flags=", &tail)) {
4113 Arguments::set_jvm_flags_file(tail);
4114 continue;
4115 }
4116 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4117 if (vm_options_file_args.found_vm_options_file_arg()) {
4118 jio_fprintf(defaultStream::error_stream(),
4119 "The option '%s' is already specified in the options "
4120 "container '%s' so the specification of '%s' in the "
4121 "same options container is an error.\n",
4122 vm_options_file_args.vm_options_file_arg(),
4123 vm_options_file_args.container_name(),
4124 option->optionString);
4125 return JNI_EINVAL;
4126 }
4127 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4128 // If there's a VMOptionsFile, parse that
4129 jint code = insert_vm_options_file(args, tail, index,
4130 &vm_options_file_args, args_out);
4131 if (code != JNI_OK) {
4132 return code;
4133 }
4134 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4135 if (args_out->is_set()) {
4136 // The VMOptions file inserted some options so switch 'args'
4137 // to the new set of options, and continue processing which
4138 // preserves "last option wins" semantics.
4139 args = args_out->get();
4140 // The first option from the VMOptionsFile replaces the
4141 // current option. So we back track to process the
4142 // replacement option.
4143 index--;
4144 }
4145 continue;
4146 }
4147 if (match_option(option, "-XX:+PrintVMOptions")) {
4148 PrintVMOptions = true;
4149 continue;
4150 }
4151 if (match_option(option, "-XX:-PrintVMOptions")) {
4152 PrintVMOptions = false;
4153 continue;
4154 }
4155 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4156 IgnoreUnrecognizedVMOptions = true;
4157 continue;
4158 }
4159 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4160 IgnoreUnrecognizedVMOptions = false;
4161 continue;
4162 }
4163 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4164 CommandLineFlags::printFlags(tty, false);
4165 vm_exit(0);
4166 }
4167 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4168 #if INCLUDE_NMT
4169 // The launcher did not setup nmt environment variable properly.
4170 if (!MemTracker::check_launcher_nmt_support(tail)) {
4171 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4172 }
4173
4174 // Verify if nmt option is valid.
4175 if (MemTracker::verify_nmt_option()) {
4176 // Late initialization, still in single-threaded mode.
4177 if (MemTracker::tracking_level() >= NMT_summary) {
4178 MemTracker::init();
4179 }
4180 } else {
4181 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4182 }
4183 continue;
4184 #else
4185 jio_fprintf(defaultStream::error_stream(),
4186 "Native Memory Tracking is not supported in this VM\n");
4187 return JNI_ERR;
4188 #endif
4189 }
4190
4191 #ifndef PRODUCT
4192 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4193 CommandLineFlags::printFlags(tty, true);
4194 vm_exit(0);
4195 }
4196 #endif
4197 }
4198 return JNI_OK;
4199 }
4200
4201 static void print_options(const JavaVMInitArgs *args) {
4202 const char* tail;
4203 for (int index = 0; index < args->nOptions; index++) {
4204 const JavaVMOption *option = args->options + index;
4205 if (match_option(option, "-XX:", &tail)) {
4206 logOption(tail);
4207 }
4208 }
4209 }
4210
4211 bool Arguments::handle_deprecated_print_gc_flags() {
4212 if (PrintGC) {
4213 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4214 }
4215 if (PrintGCDetails) {
4216 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4217 }
4218
4219 if (_gc_log_filename != NULL) {
4220 // -Xloggc was used to specify a filename
4221 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4222
4223 LogTarget(Error, logging) target;
4224 LogStreamCHeap errstream(target);
4225 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4226 } else if (PrintGC || PrintGCDetails) {
4227 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4228 }
4229 return true;
4230 }
4231
4232 void Arguments::handle_extra_cms_flags(const char* msg) {
4233 SpecialFlag flag;
4234 const char *flag_name = "UseConcMarkSweepGC";
4235 if (lookup_special_flag(flag_name, flag)) {
4236 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4237 warning("%s", msg);
4238 }
4239 }
4240
4241 // Parse entry point called from JNI_CreateJavaVM
4242
4243 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4244 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4245
4246 // Initialize ranges, constraints and writeables
4247 CommandLineFlagRangeList::init();
4248 CommandLineFlagConstraintList::init();
4249 CommandLineFlagWriteableList::init();
4250
4251 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4252 const char* hotspotrc = ".hotspotrc";
4253 bool settings_file_specified = false;
4254 bool needs_hotspotrc_warning = false;
4255 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4256 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4257
4258 // Pointers to current working set of containers
4259 JavaVMInitArgs* cur_cmd_args;
4260 JavaVMInitArgs* cur_java_options_args;
4261 JavaVMInitArgs* cur_java_tool_options_args;
4262
4263 // Containers for modified/expanded options
4264 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4265 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4266 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4267
4268
4269 jint code =
4270 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4271 if (code != JNI_OK) {
4272 return code;
4273 }
4274
4275 code = parse_java_options_environment_variable(&initial_java_options_args);
4276 if (code != JNI_OK) {
4277 return code;
4278 }
4279
4280 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4281 &mod_java_tool_options_args,
4282 &cur_java_tool_options_args);
4283 if (code != JNI_OK) {
4284 return code;
4285 }
4286
4287 code = expand_vm_options_as_needed(initial_cmd_args,
4288 &mod_cmd_args,
4289 &cur_cmd_args);
4290 if (code != JNI_OK) {
4291 return code;
4292 }
4293
4294 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4295 &mod_java_options_args,
4296 &cur_java_options_args);
4297 if (code != JNI_OK) {
4298 return code;
4299 }
4300
4301 const char* flags_file = Arguments::get_jvm_flags_file();
4302 settings_file_specified = (flags_file != NULL);
4303
4304 if (IgnoreUnrecognizedVMOptions) {
4305 cur_cmd_args->ignoreUnrecognized = true;
4306 cur_java_tool_options_args->ignoreUnrecognized = true;
4307 cur_java_options_args->ignoreUnrecognized = true;
4308 }
4309
4310 // Parse specified settings file
4311 if (settings_file_specified) {
4312 if (!process_settings_file(flags_file, true,
4313 cur_cmd_args->ignoreUnrecognized)) {
4314 return JNI_EINVAL;
4315 }
4316 } else {
4317 #ifdef ASSERT
4318 // Parse default .hotspotrc settings file
4319 if (!process_settings_file(".hotspotrc", false,
4320 cur_cmd_args->ignoreUnrecognized)) {
4321 return JNI_EINVAL;
4322 }
4323 #else
4324 struct stat buf;
4325 if (os::stat(hotspotrc, &buf) == 0) {
4326 needs_hotspotrc_warning = true;
4327 }
4328 #endif
4329 }
4330
4331 if (PrintVMOptions) {
4332 print_options(cur_java_tool_options_args);
4333 print_options(cur_cmd_args);
4334 print_options(cur_java_options_args);
4335 }
4336
4337 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4338 jint result = parse_vm_init_args(cur_java_tool_options_args,
4339 cur_java_options_args,
4340 cur_cmd_args);
4341
4342 if (result != JNI_OK) {
4343 return result;
4344 }
4345
4346 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4347 SharedArchivePath = get_shared_archive_path();
4348 if (SharedArchivePath == NULL) {
4349 return JNI_ENOMEM;
4350 }
4351
4352 // Set up VerifySharedSpaces
4353 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4354 VerifySharedSpaces = true;
4355 }
4356
4357 // Delay warning until here so that we've had a chance to process
4358 // the -XX:-PrintWarnings flag
4359 if (needs_hotspotrc_warning) {
4360 warning("%s file is present but has been ignored. "
4361 "Run with -XX:Flags=%s to load the file.",
4362 hotspotrc, hotspotrc);
4363 }
4364
4365 if (needs_module_property_warning) {
4366 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4367 " names that are reserved for internal use.");
4368 }
4369
4370 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4371 UNSUPPORTED_OPTION(UseLargePages);
4372 #endif
4373
4374 ArgumentsExt::report_unsupported_options();
4375
4376 #ifndef PRODUCT
4377 if (TraceBytecodesAt != 0) {
4378 TraceBytecodes = true;
4379 }
4380 if (CountCompiledCalls) {
4381 if (UseCounterDecay) {
4382 warning("UseCounterDecay disabled because CountCalls is set");
4383 UseCounterDecay = false;
4384 }
4385 }
4386 #endif // PRODUCT
4387
4388 if (ScavengeRootsInCode == 0) {
4389 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4390 warning("Forcing ScavengeRootsInCode non-zero");
4391 }
4392 ScavengeRootsInCode = 1;
4393 }
4394
4395 if (!handle_deprecated_print_gc_flags()) {
4396 return JNI_EINVAL;
4397 }
4398
4399 // Set object alignment values.
4400 set_object_alignment();
4401
4402 #if !INCLUDE_CDS
4403 if (DumpSharedSpaces || RequireSharedSpaces) {
4404 jio_fprintf(defaultStream::error_stream(),
4405 "Shared spaces are not supported in this VM\n");
4406 return JNI_ERR;
4407 }
4408 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4409 warning("Shared spaces are not supported in this VM");
4410 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4411 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4412 }
4413 no_shared_spaces("CDS Disabled");
4414 #endif // INCLUDE_CDS
4415
4416 return JNI_OK;
4417 }
4418
4419 jint Arguments::apply_ergo() {
4420 // Set flags based on ergonomics.
4421 set_ergonomics_flags();
4422
4423 set_shared_spaces_flags();
4424
4425 // Check the GC selections again.
4426 if (!check_gc_consistency()) {
4427 return JNI_EINVAL;
4428 }
4429
4430 if (TieredCompilation) {
4431 set_tiered_flags();
4432 } else {
4433 int max_compilation_policy_choice = 1;
4434 #ifdef COMPILER2
4435 max_compilation_policy_choice = 2;
4436 #endif
4437 // Check if the policy is valid.
4438 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4439 vm_exit_during_initialization(
4440 "Incompatible compilation policy selected", NULL);
4441 }
4442 // Scale CompileThreshold
4443 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4444 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4445 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4446 }
4447 }
4448
4449 #ifdef COMPILER2
4450 #ifndef PRODUCT
4451 if (PrintIdealGraphLevel > 0) {
4452 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4453 }
4454 #endif
4455 #endif
4456
4457 // Set heap size based on available physical memory
4458 set_heap_size();
4459
4460 ArgumentsExt::set_gc_specific_flags();
4461
4462 // Initialize Metaspace flags and alignments
4463 Metaspace::ergo_initialize();
4464
4465 // Set bytecode rewriting flags
4466 set_bytecode_flags();
4467
4468 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4469 jint code = set_aggressive_opts_flags();
4470 if (code != JNI_OK) {
4471 return code;
4472 }
4473
4474 // Turn off biased locking for locking debug mode flags,
4475 // which are subtly different from each other but neither works with
4476 // biased locking
4477 if (UseHeavyMonitors
4478 #ifdef COMPILER1
4479 || !UseFastLocking
4480 #endif // COMPILER1
4481 #if INCLUDE_JVMCI
4482 || !JVMCIUseFastLocking
4483 #endif
4484 ) {
4485 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4486 // flag set to true on command line; warn the user that they
4487 // can't enable biased locking here
4488 warning("Biased Locking is not supported with locking debug flags"
4489 "; ignoring UseBiasedLocking flag." );
4490 }
4491 UseBiasedLocking = false;
4492 }
4493
4494 #ifdef CC_INTERP
4495 // Clear flags not supported on zero.
4496 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4497 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4498 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4499 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4500 #endif // CC_INTERP
4501
4502 #ifdef COMPILER2
4503 if (!EliminateLocks) {
4504 EliminateNestedLocks = false;
4505 }
4506 if (!Inline) {
4507 IncrementalInline = false;
4508 }
4509 #ifndef PRODUCT
4510 if (!IncrementalInline) {
4511 AlwaysIncrementalInline = false;
4512 }
4513 #endif
4514 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4515 // nothing to use the profiling, turn if off
4516 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4517 }
4518 #endif
4519
4520 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4521 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4522 DebugNonSafepoints = true;
4523 }
4524
4525 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4526 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4527 }
4528
4529 if (UseOnStackReplacement && !UseLoopCounter) {
4530 warning("On-stack-replacement requires loop counters; enabling loop counters");
4531 FLAG_SET_DEFAULT(UseLoopCounter, true);
4532 }
4533
4534 #ifndef PRODUCT
4535 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4536 if (use_vm_log()) {
4537 LogVMOutput = true;
4538 }
4539 }
4540 #endif // PRODUCT
4541
4542 if (PrintCommandLineFlags) {
4543 CommandLineFlags::printSetFlags(tty);
4544 }
4545
4546 // Apply CPU specific policy for the BiasedLocking
4547 if (UseBiasedLocking) {
4548 if (!VM_Version::use_biased_locking() &&
4549 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4550 UseBiasedLocking = false;
4551 }
4552 }
4553 #ifdef COMPILER2
4554 if (!UseBiasedLocking || EmitSync != 0) {
4555 UseOptoBiasInlining = false;
4556 }
4557 #endif
4558
4559 return JNI_OK;
4560 }
4561
4562 jint Arguments::adjust_after_os() {
4563 if (UseNUMA) {
4564 if (UseParallelGC || UseParallelOldGC) {
4565 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4566 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4567 }
4568 }
4569 // UseNUMAInterleaving is set to ON for all collectors and
4570 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4571 // such as the parallel collector for Linux and Solaris will
4572 // interleave old gen and survivor spaces on top of NUMA
4573 // allocation policy for the eden space.
4574 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4575 // all platforms and ParallelGC on Windows will interleave all
4576 // of the heap spaces across NUMA nodes.
4577 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4578 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4579 }
4580 }
4581 return JNI_OK;
4582 }
4583
4584 int Arguments::PropertyList_count(SystemProperty* pl) {
4585 int count = 0;
4586 while(pl != NULL) {
4587 count++;
4588 pl = pl->next();
4589 }
4590 return count;
4591 }
4592
4593 // Return the number of readable properties.
4594 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4595 int count = 0;
4596 while(pl != NULL) {
4597 if (pl->is_readable()) {
4598 count++;
4599 }
4600 pl = pl->next();
4601 }
4602 return count;
4603 }
4604
4605 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4606 assert(key != NULL, "just checking");
4607 SystemProperty* prop;
4608 for (prop = pl; prop != NULL; prop = prop->next()) {
4609 if (strcmp(key, prop->key()) == 0) return prop->value();
4610 }
4611 return NULL;
4612 }
4613
4614 // Return the value of the requested property provided that it is a readable property.
4615 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4616 assert(key != NULL, "just checking");
4617 SystemProperty* prop;
4618 // Return the property value if the keys match and the property is not internal or
4619 // it's the special internal property "jdk.boot.class.path.append".
4620 for (prop = pl; prop != NULL; prop = prop->next()) {
4621 if (strcmp(key, prop->key()) == 0) {
4622 if (!prop->internal()) {
4623 return prop->value();
4624 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4625 return prop->value();
4626 } else {
4627 // Property is internal and not jdk.boot.class.path.append so return NULL.
4628 return NULL;
4629 }
4630 }
4631 }
4632 return NULL;
4633 }
4634
4635 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4636 int count = 0;
4637 const char* ret_val = NULL;
4638
4639 while(pl != NULL) {
4640 if(count >= index) {
4641 ret_val = pl->key();
4642 break;
4643 }
4644 count++;
4645 pl = pl->next();
4646 }
4647
4648 return ret_val;
4649 }
4650
4651 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4652 int count = 0;
4653 char* ret_val = NULL;
4654
4655 while(pl != NULL) {
4656 if(count >= index) {
4657 ret_val = pl->value();
4658 break;
4659 }
4660 count++;
4661 pl = pl->next();
4662 }
4663
4664 return ret_val;
4665 }
4666
4667 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4668 SystemProperty* p = *plist;
4669 if (p == NULL) {
4670 *plist = new_p;
4671 } else {
4672 while (p->next() != NULL) {
4673 p = p->next();
4674 }
4675 p->set_next(new_p);
4676 }
4677 }
4678
4679 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4680 bool writeable, bool internal) {
4681 if (plist == NULL)
4682 return;
4683
4684 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4685 PropertyList_add(plist, new_p);
4686 }
4687
4688 void Arguments::PropertyList_add(SystemProperty *element) {
4689 PropertyList_add(&_system_properties, element);
4690 }
4691
4692 // This add maintains unique property key in the list.
4693 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4694 PropertyAppendable append, PropertyWriteable writeable,
4695 PropertyInternal internal) {
4696 if (plist == NULL)
4697 return;
4698
4699 // If property key exist then update with new value.
4700 SystemProperty* prop;
4701 for (prop = *plist; prop != NULL; prop = prop->next()) {
4702 if (strcmp(k, prop->key()) == 0) {
4703 if (append == AppendProperty) {
4704 prop->append_value(v);
4705 } else {
4706 prop->set_value(v);
4707 }
4708 return;
4709 }
4710 }
4711
4712 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4713 }
4714
4715 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4716 // Returns true if all of the source pointed by src has been copied over to
4717 // the destination buffer pointed by buf. Otherwise, returns false.
4718 // Notes:
4719 // 1. If the length (buflen) of the destination buffer excluding the
4720 // NULL terminator character is not long enough for holding the expanded
4721 // pid characters, it also returns false instead of returning the partially
4722 // expanded one.
4723 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4724 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4725 char* buf, size_t buflen) {
4726 const char* p = src;
4727 char* b = buf;
4728 const char* src_end = &src[srclen];
4729 char* buf_end = &buf[buflen - 1];
4730
4731 while (p < src_end && b < buf_end) {
4732 if (*p == '%') {
4733 switch (*(++p)) {
4734 case '%': // "%%" ==> "%"
4735 *b++ = *p++;
4736 break;
4737 case 'p': { // "%p" ==> current process id
4738 // buf_end points to the character before the last character so
4739 // that we could write '\0' to the end of the buffer.
4740 size_t buf_sz = buf_end - b + 1;
4741 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4742
4743 // if jio_snprintf fails or the buffer is not long enough to hold
4744 // the expanded pid, returns false.
4745 if (ret < 0 || ret >= (int)buf_sz) {
4746 return false;
4747 } else {
4748 b += ret;
4749 assert(*b == '\0', "fail in copy_expand_pid");
4750 if (p == src_end && b == buf_end + 1) {
4751 // reach the end of the buffer.
4752 return true;
4753 }
4754 }
4755 p++;
4756 break;
4757 }
4758 default :
4759 *b++ = '%';
4760 }
4761 } else {
4762 *b++ = *p++;
4763 }
4764 }
4765 *b = '\0';
4766 return (p == src_end); // return false if not all of the source was copied
4767 }