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 const char* unsupported_options[] = { "-m",
1328 "--limit-modules",
1329 "--module-path",
1330 "--upgrade-module-path",
1331 "--add-modules" };
1332 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1333 // If a vm option is found in the unsupported_options array with index less than the warning_idx,
1334 // vm will exit with an error message. Otherwise, it will result in a warning message.
1335 uint warning_idx = 2;
1336 SystemProperty* sp = system_properties();
1337 while (sp != NULL) {
1338 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1339 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1340 if (i < warning_idx) {
1341 vm_exit_during_initialization(
1342 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1343 } else {
1344 warning(
1345 "the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1346 }
1347 }
1348 }
1349 sp = sp->next();
1350 }
1351
1352 // Check for an exploded module build in use with -Xshare:dump.
1353 if (!has_jimage()) {
1354 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1355 }
1356 }
1357 #endif
1358
1359 //===========================================================================================================
1360 // Setting int/mixed/comp mode flags
1361
1362 void Arguments::set_mode_flags(Mode mode) {
1363 // Set up default values for all flags.
1364 // If you add a flag to any of the branches below,
1365 // add a default value for it here.
1366 set_java_compiler(false);
1367 _mode = mode;
1368
1369 // Ensure Agent_OnLoad has the correct initial values.
1370 // This may not be the final mode; mode may change later in onload phase.
1371 PropertyList_unique_add(&_system_properties, "java.vm.info",
1372 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1373
1374 UseInterpreter = true;
1375 UseCompiler = true;
1376 UseLoopCounter = true;
1377
1378 // Default values may be platform/compiler dependent -
1379 // use the saved values
1380 ClipInlining = Arguments::_ClipInlining;
1381 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1382 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1383 BackgroundCompilation = Arguments::_BackgroundCompilation;
1384 if (TieredCompilation) {
1385 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1386 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1387 }
1388 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1389 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1390 }
1391 }
1392
1393 // Change from defaults based on mode
1394 switch (mode) {
1395 default:
1396 ShouldNotReachHere();
1397 break;
1398 case _int:
1399 UseCompiler = false;
1400 UseLoopCounter = false;
1401 AlwaysCompileLoopMethods = false;
1402 UseOnStackReplacement = false;
1403 break;
1404 case _mixed:
1405 // same as default
1406 break;
1407 case _comp:
1408 UseInterpreter = false;
1409 BackgroundCompilation = false;
1410 ClipInlining = false;
1411 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1412 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1413 // compile a level 4 (C2) and then continue executing it.
1414 if (TieredCompilation) {
1415 Tier3InvokeNotifyFreqLog = 0;
1416 Tier4InvocationThreshold = 0;
1417 }
1418 break;
1419 }
1420 }
1421
1422 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1423 // Conflict: required to use shared spaces (-Xshare:on), but
1424 // incompatible command line options were chosen.
1425
1426 static void no_shared_spaces(const char* message) {
1427 if (RequireSharedSpaces) {
1428 jio_fprintf(defaultStream::error_stream(),
1429 "Class data sharing is inconsistent with other specified options.\n");
1430 vm_exit_during_initialization("Unable to use shared archive.", message);
1431 } else {
1432 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1433 }
1434 }
1435 #endif
1436
1437 // Returns threshold scaled with the value of scale.
1438 // If scale < 0.0, threshold is returned without scaling.
1439 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1440 if (scale == 1.0 || scale < 0.0) {
1441 return threshold;
1442 } else {
1443 return (intx)(threshold * scale);
1444 }
1445 }
1446
1447 // Returns freq_log scaled with the value of scale.
1448 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1449 // If scale < 0.0, freq_log is returned without scaling.
1450 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1451 // Check if scaling is necessary or if negative value was specified.
1452 if (scale == 1.0 || scale < 0.0) {
1453 return freq_log;
1454 }
1455 // Check values to avoid calculating log2 of 0.
1456 if (scale == 0.0 || freq_log == 0) {
1457 return 0;
1458 }
1459 // Determine the maximum notification frequency value currently supported.
1460 // The largest mask value that the interpreter/C1 can handle is
1461 // of length InvocationCounter::number_of_count_bits. Mask values are always
1462 // one bit shorter then the value of the notification frequency. Set
1463 // max_freq_bits accordingly.
1464 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1465 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1466 if (scaled_freq == 0) {
1467 // Return 0 right away to avoid calculating log2 of 0.
1468 return 0;
1469 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1470 return max_freq_bits;
1471 } else {
1472 return log2_intptr(scaled_freq);
1473 }
1474 }
1475
1476 void Arguments::set_tiered_flags() {
1477 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1478 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1479 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1480 }
1481 if (CompilationPolicyChoice < 2) {
1482 vm_exit_during_initialization(
1483 "Incompatible compilation policy selected", NULL);
1484 }
1485 // Increase the code cache size - tiered compiles a lot more.
1486 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1487 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1488 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1489 }
1490 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1491 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1492 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1493 }
1494 if (!UseInterpreter) { // -Xcomp
1495 Tier3InvokeNotifyFreqLog = 0;
1496 Tier4InvocationThreshold = 0;
1497 }
1498
1499 if (CompileThresholdScaling < 0) {
1500 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1501 }
1502
1503 // Scale tiered compilation thresholds.
1504 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1505 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1506 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1507 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1508
1509 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1510 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1511 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1512 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1513
1514 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1515 // once these thresholds become supported.
1516
1517 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1518 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1519
1520 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1521 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1522
1523 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1524
1525 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1526 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1527 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1528 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1529 }
1530 }
1531
1532 #if INCLUDE_ALL_GCS
1533 static void disable_adaptive_size_policy(const char* collector_name) {
1534 if (UseAdaptiveSizePolicy) {
1535 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1536 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1537 collector_name);
1538 }
1539 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1540 }
1541 }
1542
1543 void Arguments::set_parnew_gc_flags() {
1544 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1545 "control point invariant");
1546 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1547 assert(UseParNewGC, "ParNew should always be used with CMS");
1548
1549 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1550 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1551 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1552 } else if (ParallelGCThreads == 0) {
1553 jio_fprintf(defaultStream::error_stream(),
1554 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1555 vm_exit(1);
1556 }
1557
1558 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1559 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1560 // we set them to 1024 and 1024.
1561 // See CR 6362902.
1562 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1563 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1564 }
1565 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1566 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1567 }
1568
1569 // When using compressed oops, we use local overflow stacks,
1570 // rather than using a global overflow list chained through
1571 // the klass word of the object's pre-image.
1572 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1573 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1574 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1575 }
1576 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1577 }
1578 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1579 }
1580
1581 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1582 // sparc/solaris for certain applications, but would gain from
1583 // further optimization and tuning efforts, and would almost
1584 // certainly gain from analysis of platform and environment.
1585 void Arguments::set_cms_and_parnew_gc_flags() {
1586 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1587 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1588 assert(UseParNewGC, "ParNew should always be used with CMS");
1589
1590 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1591 disable_adaptive_size_policy("UseConcMarkSweepGC");
1592
1593 set_parnew_gc_flags();
1594
1595 size_t max_heap = align_size_down(MaxHeapSize,
1596 CardTableRS::ct_max_alignment_constraint());
1597
1598 // Now make adjustments for CMS
1599 intx tenuring_default = (intx)6;
1600 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1601
1602 // Preferred young gen size for "short" pauses:
1603 // upper bound depends on # of threads and NewRatio.
1604 const size_t preferred_max_new_size_unaligned =
1605 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1606 size_t preferred_max_new_size =
1607 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1608
1609 // Unless explicitly requested otherwise, size young gen
1610 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1611
1612 // If either MaxNewSize or NewRatio is set on the command line,
1613 // assume the user is trying to set the size of the young gen.
1614 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1615
1616 // Set MaxNewSize to our calculated preferred_max_new_size unless
1617 // NewSize was set on the command line and it is larger than
1618 // preferred_max_new_size.
1619 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1620 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1621 } else {
1622 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1623 }
1624 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1625
1626 // Code along this path potentially sets NewSize and OldSize
1627 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1628 min_heap_size(), InitialHeapSize, max_heap);
1629 size_t min_new = preferred_max_new_size;
1630 if (FLAG_IS_CMDLINE(NewSize)) {
1631 min_new = NewSize;
1632 }
1633 if (max_heap > min_new && min_heap_size() > min_new) {
1634 // Unless explicitly requested otherwise, make young gen
1635 // at least min_new, and at most preferred_max_new_size.
1636 if (FLAG_IS_DEFAULT(NewSize)) {
1637 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1638 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1639 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1640 }
1641 // Unless explicitly requested otherwise, size old gen
1642 // so it's NewRatio x of NewSize.
1643 if (FLAG_IS_DEFAULT(OldSize)) {
1644 if (max_heap > NewSize) {
1645 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1646 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1647 }
1648 }
1649 }
1650 }
1651 // Unless explicitly requested otherwise, definitely
1652 // promote all objects surviving "tenuring_default" scavenges.
1653 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1654 FLAG_IS_DEFAULT(SurvivorRatio)) {
1655 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1656 }
1657 // If we decided above (or user explicitly requested)
1658 // `promote all' (via MaxTenuringThreshold := 0),
1659 // prefer minuscule survivor spaces so as not to waste
1660 // space for (non-existent) survivors
1661 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1662 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1663 }
1664
1665 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1666 // but rather the number of free blocks of a given size that are used when
1667 // replenishing the local per-worker free list caches.
1668 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1669 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1670 // OldPLAB sizing manually turned off: Use a larger default setting,
1671 // unless it was manually specified. This is because a too-low value
1672 // will slow down scavenges.
1673 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1674 } else {
1675 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1676 }
1677 }
1678
1679 // If either of the static initialization defaults have changed, note this
1680 // modification.
1681 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1682 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1683 }
1684
1685 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1686 }
1687 #endif // INCLUDE_ALL_GCS
1688
1689 void set_object_alignment() {
1690 // Object alignment.
1691 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1692 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1693 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1694 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1695 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1696 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1697
1698 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1699 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1700
1701 // Oop encoding heap max
1702 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1703
1704 if (SurvivorAlignmentInBytes == 0) {
1705 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1706 }
1707
1708 #if INCLUDE_ALL_GCS
1709 // Set CMS global values
1710 CompactibleFreeListSpace::set_cms_values();
1711 #endif // INCLUDE_ALL_GCS
1712 }
1713
1714 size_t Arguments::max_heap_for_compressed_oops() {
1715 // Avoid sign flip.
1716 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1717 // We need to fit both the NULL page and the heap into the memory budget, while
1718 // keeping alignment constraints of the heap. To guarantee the latter, as the
1719 // NULL page is located before the heap, we pad the NULL page to the conservative
1720 // maximum alignment that the GC may ever impose upon the heap.
1721 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1722 _conservative_max_heap_alignment);
1723
1724 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1725 NOT_LP64(ShouldNotReachHere(); return 0);
1726 }
1727
1728 bool Arguments::should_auto_select_low_pause_collector() {
1729 if (UseAutoGCSelectPolicy &&
1730 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1731 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1732 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1733 return true;
1734 }
1735 return false;
1736 }
1737
1738 void Arguments::set_use_compressed_oops() {
1739 #ifndef ZERO
1740 #ifdef _LP64
1741 // MaxHeapSize is not set up properly at this point, but
1742 // the only value that can override MaxHeapSize if we are
1743 // to use UseCompressedOops is InitialHeapSize.
1744 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1745
1746 if (max_heap_size <= max_heap_for_compressed_oops()) {
1747 #if !defined(COMPILER1) || defined(TIERED)
1748 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1749 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1750 }
1751 #endif
1752 } else {
1753 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1754 warning("Max heap size too large for Compressed Oops");
1755 FLAG_SET_DEFAULT(UseCompressedOops, false);
1756 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1757 }
1758 }
1759 #endif // _LP64
1760 #endif // ZERO
1761 }
1762
1763
1764 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1765 // set_use_compressed_oops().
1766 void Arguments::set_use_compressed_klass_ptrs() {
1767 #ifndef ZERO
1768 #ifdef _LP64
1769 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1770 if (!UseCompressedOops) {
1771 if (UseCompressedClassPointers) {
1772 warning("UseCompressedClassPointers requires UseCompressedOops");
1773 }
1774 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1775 } else {
1776 // Turn on UseCompressedClassPointers too
1777 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1778 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1779 }
1780 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1781 if (UseCompressedClassPointers) {
1782 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1783 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1784 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1785 }
1786 }
1787 }
1788 #endif // _LP64
1789 #endif // !ZERO
1790 }
1791
1792 void Arguments::set_conservative_max_heap_alignment() {
1793 // The conservative maximum required alignment for the heap is the maximum of
1794 // the alignments imposed by several sources: any requirements from the heap
1795 // itself, the collector policy and the maximum page size we may run the VM
1796 // with.
1797 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1798 #if INCLUDE_ALL_GCS
1799 if (UseParallelGC) {
1800 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1801 } else if (UseG1GC) {
1802 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1803 }
1804 #endif // INCLUDE_ALL_GCS
1805 _conservative_max_heap_alignment = MAX4(heap_alignment,
1806 (size_t)os::vm_allocation_granularity(),
1807 os::max_page_size(),
1808 CollectorPolicy::compute_heap_alignment());
1809 }
1810
1811 bool Arguments::gc_selected() {
1812 #if INCLUDE_ALL_GCS
1813 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1814 #else
1815 return UseSerialGC;
1816 #endif // INCLUDE_ALL_GCS
1817 }
1818
1819 void Arguments::select_gc_ergonomically() {
1820 #if INCLUDE_ALL_GCS
1821 if (os::is_server_class_machine()) {
1822 if (!UseAutoGCSelectPolicy) {
1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1824 } else {
1825 if (should_auto_select_low_pause_collector()) {
1826 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1827 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1828 } else {
1829 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1830 }
1831 }
1832 } else {
1833 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1834 }
1835 #else
1836 UNSUPPORTED_OPTION(UseG1GC);
1837 UNSUPPORTED_OPTION(UseParallelGC);
1838 UNSUPPORTED_OPTION(UseParallelOldGC);
1839 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1840 UNSUPPORTED_OPTION(UseParNewGC);
1841 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1842 #endif // INCLUDE_ALL_GCS
1843 }
1844
1845 void Arguments::select_gc() {
1846 if (!gc_selected()) {
1847 select_gc_ergonomically();
1848 if (!gc_selected()) {
1849 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1850 }
1851 }
1852 }
1853
1854 void Arguments::set_ergonomics_flags() {
1855 select_gc();
1856
1857 #if defined(COMPILER2) || INCLUDE_JVMCI
1858 // Shared spaces work fine with other GCs but causes bytecode rewriting
1859 // to be disabled, which hurts interpreter performance and decreases
1860 // server performance. When -server is specified, keep the default off
1861 // unless it is asked for. Future work: either add bytecode rewriting
1862 // at link time, or rewrite bytecodes in non-shared methods.
1863 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1864 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1865 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1866 }
1867 #endif
1868
1869 set_conservative_max_heap_alignment();
1870
1871 #ifndef ZERO
1872 #ifdef _LP64
1873 set_use_compressed_oops();
1874
1875 // set_use_compressed_klass_ptrs() must be called after calling
1876 // set_use_compressed_oops().
1877 set_use_compressed_klass_ptrs();
1878
1879 // Also checks that certain machines are slower with compressed oops
1880 // in vm_version initialization code.
1881 #endif // _LP64
1882 #endif // !ZERO
1883
1884 }
1885
1886 void Arguments::set_parallel_gc_flags() {
1887 assert(UseParallelGC || UseParallelOldGC, "Error");
1888 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1889 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1890 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1891 }
1892 FLAG_SET_DEFAULT(UseParallelGC, true);
1893
1894 // If no heap maximum was requested explicitly, use some reasonable fraction
1895 // of the physical memory, up to a maximum of 1GB.
1896 FLAG_SET_DEFAULT(ParallelGCThreads,
1897 Abstract_VM_Version::parallel_worker_threads());
1898 if (ParallelGCThreads == 0) {
1899 jio_fprintf(defaultStream::error_stream(),
1900 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1901 vm_exit(1);
1902 }
1903
1904 if (UseAdaptiveSizePolicy) {
1905 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1906 // unless the user actually sets these flags.
1907 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1908 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1909 }
1910 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1911 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1912 }
1913 }
1914
1915 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1916 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1917 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1918 // See CR 6362902 for details.
1919 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1920 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1921 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1922 }
1923 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1924 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1925 }
1926 }
1927
1928 if (UseParallelOldGC) {
1929 // Par compact uses lower default values since they are treated as
1930 // minimums. These are different defaults because of the different
1931 // interpretation and are not ergonomically set.
1932 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1933 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1934 }
1935 }
1936 }
1937
1938 void Arguments::set_g1_gc_flags() {
1939 assert(UseG1GC, "Error");
1940 #if defined(COMPILER1) || INCLUDE_JVMCI
1941 FastTLABRefill = false;
1942 #endif
1943 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1944 if (ParallelGCThreads == 0) {
1945 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1946 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1947 }
1948
1949 #if INCLUDE_ALL_GCS
1950 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1951 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1952 }
1953 #endif
1954
1955 // MarkStackSize will be set (if it hasn't been set by the user)
1956 // when concurrent marking is initialized.
1957 // Its value will be based upon the number of parallel marking threads.
1958 // But we do set the maximum mark stack size here.
1959 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1960 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1961 }
1962
1963 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1964 // In G1, we want the default GC overhead goal to be higher than
1965 // it is for PS, or the heap might be expanded too aggressively.
1966 // We set it here to ~8%.
1967 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1968 }
1969
1970 // Below, we might need to calculate the pause time interval based on
1971 // the pause target. When we do so we are going to give G1 maximum
1972 // flexibility and allow it to do pauses when it needs to. So, we'll
1973 // arrange that the pause interval to be pause time target + 1 to
1974 // ensure that a) the pause time target is maximized with respect to
1975 // the pause interval and b) we maintain the invariant that pause
1976 // time target < pause interval. If the user does not want this
1977 // maximum flexibility, they will have to set the pause interval
1978 // explicitly.
1979
1980 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1981 // The default pause time target in G1 is 200ms
1982 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1983 }
1984
1985 // Then, if the interval parameter was not set, set it according to
1986 // the pause time target (this will also deal with the case when the
1987 // pause time target is the default value).
1988 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1989 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1990 }
1991
1992 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1993 }
1994
1995 void Arguments::set_gc_specific_flags() {
1996 #if INCLUDE_ALL_GCS
1997 // Set per-collector flags
1998 if (UseParallelGC || UseParallelOldGC) {
1999 set_parallel_gc_flags();
2000 } else if (UseConcMarkSweepGC) {
2001 set_cms_and_parnew_gc_flags();
2002 } else if (UseG1GC) {
2003 set_g1_gc_flags();
2004 }
2005 if (AssumeMP && !UseSerialGC) {
2006 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2007 warning("If the number of processors is expected to increase from one, then"
2008 " you should configure the number of parallel GC threads appropriately"
2009 " using -XX:ParallelGCThreads=N");
2010 }
2011 }
2012 if (MinHeapFreeRatio == 100) {
2013 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2014 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2015 }
2016
2017 // If class unloading is disabled, also disable concurrent class unloading.
2018 if (!ClassUnloading) {
2019 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2020 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2021 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2022 }
2023 #endif // INCLUDE_ALL_GCS
2024 }
2025
2026 julong Arguments::limit_by_allocatable_memory(julong limit) {
2027 julong max_allocatable;
2028 julong result = limit;
2029 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2030 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2031 }
2032 return result;
2033 }
2034
2035 // Use static initialization to get the default before parsing
2036 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2037
2038 void Arguments::set_heap_size() {
2039 const julong phys_mem =
2040 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2041 : (julong)MaxRAM;
2042
2043 // If the maximum heap size has not been set with -Xmx,
2044 // then set it as fraction of the size of physical memory,
2045 // respecting the maximum and minimum sizes of the heap.
2046 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2047 julong reasonable_max = phys_mem / MaxRAMFraction;
2048
2049 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2050 // Small physical memory, so use a minimum fraction of it for the heap
2051 reasonable_max = phys_mem / MinRAMFraction;
2052 } else {
2053 // Not-small physical memory, so require a heap at least
2054 // as large as MaxHeapSize
2055 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2056 }
2057 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2058 // Limit the heap size to ErgoHeapSizeLimit
2059 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2060 }
2061 if (UseCompressedOops) {
2062 // Limit the heap size to the maximum possible when using compressed oops
2063 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2064
2065 // HeapBaseMinAddress can be greater than default but not less than.
2066 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2067 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2068 // matches compressed oops printing flags
2069 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2070 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2071 DefaultHeapBaseMinAddress,
2072 DefaultHeapBaseMinAddress/G,
2073 HeapBaseMinAddress);
2074 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2075 }
2076 }
2077
2078 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2079 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2080 // but it should be not less than default MaxHeapSize.
2081 max_coop_heap -= HeapBaseMinAddress;
2082 }
2083 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2084 }
2085 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2086
2087 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2088 // An initial heap size was specified on the command line,
2089 // so be sure that the maximum size is consistent. Done
2090 // after call to limit_by_allocatable_memory because that
2091 // method might reduce the allocation size.
2092 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2093 }
2094
2095 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2096 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2097 }
2098
2099 // If the minimum or initial heap_size have not been set or requested to be set
2100 // ergonomically, set them accordingly.
2101 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2102 julong reasonable_minimum = (julong)(OldSize + NewSize);
2103
2104 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2105
2106 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2107
2108 if (InitialHeapSize == 0) {
2109 julong reasonable_initial = phys_mem / InitialRAMFraction;
2110
2111 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2112 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2113
2114 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2115
2116 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2117 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2118 }
2119 // If the minimum heap size has not been set (via -Xms),
2120 // synchronize with InitialHeapSize to avoid errors with the default value.
2121 if (min_heap_size() == 0) {
2122 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2123 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2124 }
2125 }
2126 }
2127
2128 // This option inspects the machine and attempts to set various
2129 // parameters to be optimal for long-running, memory allocation
2130 // intensive jobs. It is intended for machines with large
2131 // amounts of cpu and memory.
2132 jint Arguments::set_aggressive_heap_flags() {
2133 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2134 // VM, but we may not be able to represent the total physical memory
2135 // available (like having 8gb of memory on a box but using a 32bit VM).
2136 // Thus, we need to make sure we're using a julong for intermediate
2137 // calculations.
2138 julong initHeapSize;
2139 julong total_memory = os::physical_memory();
2140
2141 if (total_memory < (julong) 256 * M) {
2142 jio_fprintf(defaultStream::error_stream(),
2143 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2144 vm_exit(1);
2145 }
2146
2147 // The heap size is half of available memory, or (at most)
2148 // all of possible memory less 160mb (leaving room for the OS
2149 // when using ISM). This is the maximum; because adaptive sizing
2150 // is turned on below, the actual space used may be smaller.
2151
2152 initHeapSize = MIN2(total_memory / (julong) 2,
2153 total_memory - (julong) 160 * M);
2154
2155 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2156
2157 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2158 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2159 return JNI_EINVAL;
2160 }
2161 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2162 return JNI_EINVAL;
2163 }
2164 // Currently the minimum size and the initial heap sizes are the same.
2165 set_min_heap_size(initHeapSize);
2166 }
2167 if (FLAG_IS_DEFAULT(NewSize)) {
2168 // Make the young generation 3/8ths of the total heap.
2169 if (FLAG_SET_CMDLINE(size_t, NewSize,
2170 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2171 return JNI_EINVAL;
2172 }
2173 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2174 return JNI_EINVAL;
2175 }
2176 }
2177
2178 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2179 FLAG_SET_DEFAULT(UseLargePages, true);
2180 #endif
2181
2182 // Increase some data structure sizes for efficiency
2183 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2187 return JNI_EINVAL;
2188 }
2189 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2190 return JNI_EINVAL;
2191 }
2192
2193 // See the OldPLABSize comment below, but replace 'after promotion'
2194 // with 'after copying'. YoungPLABSize is the size of the survivor
2195 // space per-gc-thread buffers. The default is 4kw.
2196 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2197 return JNI_EINVAL;
2198 }
2199
2200 // OldPLABSize is the size of the buffers in the old gen that
2201 // UseParallelGC uses to promote live data that doesn't fit in the
2202 // survivor spaces. At any given time, there's one for each gc thread.
2203 // The default size is 1kw. These buffers are rarely used, since the
2204 // survivor spaces are usually big enough. For specjbb, however, there
2205 // are occasions when there's lots of live data in the young gen
2206 // and we end up promoting some of it. We don't have a definite
2207 // explanation for why bumping OldPLABSize helps, but the theory
2208 // is that a bigger PLAB results in retaining something like the
2209 // original allocation order after promotion, which improves mutator
2210 // locality. A minor effect may be that larger PLABs reduce the
2211 // number of PLAB allocation events during gc. The value of 8kw
2212 // was arrived at by experimenting with specjbb.
2213 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2214 return JNI_EINVAL;
2215 }
2216
2217 // Enable parallel GC and adaptive generation sizing
2218 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221 FLAG_SET_DEFAULT(ParallelGCThreads,
2222 Abstract_VM_Version::parallel_worker_threads());
2223
2224 // Encourage steady state memory management
2225 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2226 return JNI_EINVAL;
2227 }
2228
2229 // This appears to improve mutator locality
2230 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2231 return JNI_EINVAL;
2232 }
2233
2234 // Get around early Solaris scheduling bug
2235 // (affinity vs other jobs on system)
2236 // but disallow DR and offlining (5008695).
2237 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2238 return JNI_EINVAL;
2239 }
2240
2241 return JNI_OK;
2242 }
2243
2244 // This must be called after ergonomics.
2245 void Arguments::set_bytecode_flags() {
2246 if (!RewriteBytecodes) {
2247 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2248 }
2249 }
2250
2251 // Aggressive optimization flags -XX:+AggressiveOpts
2252 jint Arguments::set_aggressive_opts_flags() {
2253 #ifdef COMPILER2
2254 if (AggressiveUnboxing) {
2255 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2256 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2257 } else if (!EliminateAutoBox) {
2258 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2259 AggressiveUnboxing = false;
2260 }
2261 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2262 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2263 } else if (!DoEscapeAnalysis) {
2264 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2265 AggressiveUnboxing = false;
2266 }
2267 }
2268 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2269 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2270 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2271 }
2272 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2273 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2274 }
2275
2276 // Feed the cache size setting into the JDK
2277 char buffer[1024];
2278 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2279 if (!add_property(buffer)) {
2280 return JNI_ENOMEM;
2281 }
2282 }
2283 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2284 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2285 }
2286 #endif
2287
2288 if (AggressiveOpts) {
2289 // Sample flag setting code
2290 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2291 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2292 // }
2293 }
2294
2295 return JNI_OK;
2296 }
2297
2298 //===========================================================================================================
2299 // Parsing of java.compiler property
2300
2301 void Arguments::process_java_compiler_argument(const char* arg) {
2302 // For backwards compatibility, Djava.compiler=NONE or ""
2303 // causes us to switch to -Xint mode UNLESS -Xdebug
2304 // is also specified.
2305 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2306 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2307 }
2308 }
2309
2310 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2311 _sun_java_launcher = os::strdup_check_oom(launcher);
2312 }
2313
2314 bool Arguments::created_by_java_launcher() {
2315 assert(_sun_java_launcher != NULL, "property must have value");
2316 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2317 }
2318
2319 bool Arguments::sun_java_launcher_is_altjvm() {
2320 return _sun_java_launcher_is_altjvm;
2321 }
2322
2323 //===========================================================================================================
2324 // Parsing of main arguments
2325
2326 #if INCLUDE_JVMCI
2327 // Check consistency of jvmci vm argument settings.
2328 bool Arguments::check_jvmci_args_consistency() {
2329 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2330 }
2331 #endif //INCLUDE_JVMCI
2332
2333 // Check consistency of GC selection
2334 bool Arguments::check_gc_consistency() {
2335 // Ensure that the user has not selected conflicting sets
2336 // of collectors.
2337 uint i = 0;
2338 if (UseSerialGC) i++;
2339 if (UseConcMarkSweepGC) i++;
2340 if (UseParallelGC || UseParallelOldGC) i++;
2341 if (UseG1GC) i++;
2342 if (i > 1) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Conflicting collector combinations in option list; "
2345 "please refer to the release notes for the combinations "
2346 "allowed\n");
2347 return false;
2348 }
2349
2350 if (UseConcMarkSweepGC && !UseParNewGC) {
2351 jio_fprintf(defaultStream::error_stream(),
2352 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2353 return false;
2354 }
2355
2356 if (UseParNewGC && !UseConcMarkSweepGC) {
2357 jio_fprintf(defaultStream::error_stream(),
2358 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2359 return false;
2360 }
2361
2362 return true;
2363 }
2364
2365 // Check the consistency of vm_init_args
2366 bool Arguments::check_vm_args_consistency() {
2367 // Method for adding checks for flag consistency.
2368 // The intent is to warn the user of all possible conflicts,
2369 // before returning an error.
2370 // Note: Needs platform-dependent factoring.
2371 bool status = true;
2372
2373 if (TLABRefillWasteFraction == 0) {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "TLABRefillWasteFraction should be a denominator, "
2376 "not " SIZE_FORMAT "\n",
2377 TLABRefillWasteFraction);
2378 status = false;
2379 }
2380
2381 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2382 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2383 }
2384
2385 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2386 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2387 }
2388
2389 if (GCTimeLimit == 100) {
2390 // Turn off gc-overhead-limit-exceeded checks
2391 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2392 }
2393
2394 status = status && check_gc_consistency();
2395
2396 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2397 // insists that we hold the requisite locks so that the iteration is
2398 // MT-safe. For the verification at start-up and shut-down, we don't
2399 // yet have a good way of acquiring and releasing these locks,
2400 // which are not visible at the CollectedHeap level. We want to
2401 // be able to acquire these locks and then do the iteration rather
2402 // than just disable the lock verification. This will be fixed under
2403 // bug 4788986.
2404 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2405 if (VerifyDuringStartup) {
2406 warning("Heap verification at start-up disabled "
2407 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2408 VerifyDuringStartup = false; // Disable verification at start-up
2409 }
2410
2411 if (VerifyBeforeExit) {
2412 warning("Heap verification at shutdown disabled "
2413 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2414 VerifyBeforeExit = false; // Disable verification at shutdown
2415 }
2416 }
2417
2418 if (PrintNMTStatistics) {
2419 #if INCLUDE_NMT
2420 if (MemTracker::tracking_level() == NMT_off) {
2421 #endif // INCLUDE_NMT
2422 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2423 PrintNMTStatistics = false;
2424 #if INCLUDE_NMT
2425 }
2426 #endif
2427 }
2428 #if INCLUDE_JVMCI
2429
2430 status = status && check_jvmci_args_consistency();
2431
2432 if (EnableJVMCI) {
2433 if (!ScavengeRootsInCode) {
2434 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2435 ScavengeRootsInCode = 1;
2436 }
2437 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2438 TypeProfileLevel = 0;
2439 }
2440 if (UseJVMCICompiler) {
2441 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2442 TypeProfileWidth = 8;
2443 }
2444 }
2445 }
2446 #endif
2447
2448 // Check lower bounds of the code cache
2449 // Template Interpreter code is approximately 3X larger in debug builds.
2450 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2451 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2454 os::vm_page_size()/K);
2455 status = false;
2456 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2457 jio_fprintf(defaultStream::error_stream(),
2458 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2459 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2460 status = false;
2461 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2464 min_code_cache_size/K);
2465 status = false;
2466 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2467 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2470 CODE_CACHE_SIZE_LIMIT/M);
2471 status = false;
2472 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2475 min_code_cache_size/K);
2476 status = false;
2477 }
2478
2479 #ifdef _LP64
2480 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2481 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2482 }
2483 #endif
2484
2485 #ifndef SUPPORT_RESERVED_STACK_AREA
2486 if (StackReservedPages != 0) {
2487 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2488 warning("Reserved Stack Area not supported on this platform");
2489 }
2490 #endif
2491
2492 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2493 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2494 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2495 }
2496 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2497 }
2498 if (UseCompiler && is_interpreter_only()) {
2499 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2500 warning("UseCompiler disabled due to -Xint.");
2501 }
2502 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2503 }
2504 #ifdef COMPILER2
2505 if (PostLoopMultiversioning && !RangeCheckElimination) {
2506 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2507 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2508 }
2509 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2510 }
2511 #endif
2512 return status;
2513 }
2514
2515 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2516 const char* option_type) {
2517 if (ignore) return false;
2518
2519 const char* spacer = " ";
2520 if (option_type == NULL) {
2521 option_type = ++spacer; // Set both to the empty string.
2522 }
2523
2524 if (os::obsolete_option(option)) {
2525 jio_fprintf(defaultStream::error_stream(),
2526 "Obsolete %s%soption: %s\n", option_type, spacer,
2527 option->optionString);
2528 return false;
2529 } else {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Unrecognized %s%soption: %s\n", option_type, spacer,
2532 option->optionString);
2533 return true;
2534 }
2535 }
2536
2537 static const char* user_assertion_options[] = {
2538 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2539 };
2540
2541 static const char* system_assertion_options[] = {
2542 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2543 };
2544
2545 bool Arguments::parse_uintx(const char* value,
2546 uintx* uintx_arg,
2547 uintx min_size) {
2548
2549 // Check the sign first since atojulong() parses only unsigned values.
2550 bool value_is_positive = !(*value == '-');
2551
2552 if (value_is_positive) {
2553 julong n;
2554 bool good_return = atojulong(value, &n);
2555 if (good_return) {
2556 bool above_minimum = n >= min_size;
2557 bool value_is_too_large = n > max_uintx;
2558
2559 if (above_minimum && !value_is_too_large) {
2560 *uintx_arg = n;
2561 return true;
2562 }
2563 }
2564 }
2565 return false;
2566 }
2567
2568 unsigned int addreads_count = 0;
2569 unsigned int addexports_count = 0;
2570 unsigned int addopens_count = 0;
2571 unsigned int addmods_count = 0;
2572 unsigned int patch_mod_count = 0;
2573
2574 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2575 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2576 char* property = AllocateHeap(prop_len, mtArguments);
2577 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2578 if (ret < 0 || ret >= (int)prop_len) {
2579 FreeHeap(property);
2580 return false;
2581 }
2582 bool added = add_property(property, UnwriteableProperty, internal);
2583 FreeHeap(property);
2584 return added;
2585 }
2586
2587 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2588 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2589 if (count < 1000) {
2590 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2591 char* property = AllocateHeap(prop_len, mtArguments);
2592 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2593 if (ret < 0 || ret >= (int)prop_len) {
2594 FreeHeap(property);
2595 return false;
2596 }
2597 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2598 FreeHeap(property);
2599 return added;
2600 }
2601 return false;
2602 }
2603
2604 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2605 julong* long_arg,
2606 julong min_size) {
2607 if (!atojulong(s, long_arg)) return arg_unreadable;
2608 return check_memory_size(*long_arg, min_size);
2609 }
2610
2611 // Parse JavaVMInitArgs structure
2612
2613 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2614 const JavaVMInitArgs *java_options_args,
2615 const JavaVMInitArgs *cmd_line_args) {
2616 bool patch_mod_javabase = false;
2617
2618 // Save default settings for some mode flags
2619 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2620 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2621 Arguments::_ClipInlining = ClipInlining;
2622 Arguments::_BackgroundCompilation = BackgroundCompilation;
2623 if (TieredCompilation) {
2624 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2625 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2626 }
2627
2628 // Setup flags for mixed which is the default
2629 set_mode_flags(_mixed);
2630
2631 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2632 // variable (if present).
2633 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2634 if (result != JNI_OK) {
2635 return result;
2636 }
2637
2638 // Parse args structure generated from the command line flags.
2639 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2640 if (result != JNI_OK) {
2641 return result;
2642 }
2643
2644 // Parse args structure generated from the _JAVA_OPTIONS environment
2645 // variable (if present) (mimics classic VM)
2646 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2647 if (result != JNI_OK) {
2648 return result;
2649 }
2650
2651 // Do final processing now that all arguments have been parsed
2652 result = finalize_vm_init_args();
2653 if (result != JNI_OK) {
2654 return result;
2655 }
2656
2657 return JNI_OK;
2658 }
2659
2660 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2661 // represents a valid JDWP agent. is_path==true denotes that we
2662 // are dealing with -agentpath (case where name is a path), otherwise with
2663 // -agentlib
2664 bool valid_jdwp_agent(char *name, bool is_path) {
2665 char *_name;
2666 const char *_jdwp = "jdwp";
2667 size_t _len_jdwp, _len_prefix;
2668
2669 if (is_path) {
2670 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2671 return false;
2672 }
2673
2674 _name++; // skip past last path separator
2675 _len_prefix = strlen(JNI_LIB_PREFIX);
2676
2677 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2678 return false;
2679 }
2680
2681 _name += _len_prefix;
2682 _len_jdwp = strlen(_jdwp);
2683
2684 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2685 _name += _len_jdwp;
2686 }
2687 else {
2688 return false;
2689 }
2690
2691 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2692 return false;
2693 }
2694
2695 return true;
2696 }
2697
2698 if (strcmp(name, _jdwp) == 0) {
2699 return true;
2700 }
2701
2702 return false;
2703 }
2704
2705 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2706 // --patch-module=<module>=<file>(<pathsep><file>)*
2707 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2708 // Find the equal sign between the module name and the path specification
2709 const char* module_equal = strchr(patch_mod_tail, '=');
2710 if (module_equal == NULL) {
2711 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2712 return JNI_ERR;
2713 } else {
2714 // Pick out the module name
2715 size_t module_len = module_equal - patch_mod_tail;
2716 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2717 if (module_name != NULL) {
2718 memcpy(module_name, patch_mod_tail, module_len);
2719 *(module_name + module_len) = '\0';
2720 // The path piece begins one past the module_equal sign
2721 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2722 FREE_C_HEAP_ARRAY(char, module_name);
2723 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2724 return JNI_ENOMEM;
2725 }
2726 } else {
2727 return JNI_ENOMEM;
2728 }
2729 }
2730 return JNI_OK;
2731 }
2732
2733 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2734 // For match_option to return remaining or value part of option string
2735 const char* tail;
2736
2737 // iterate over arguments
2738 for (int index = 0; index < args->nOptions; index++) {
2739 bool is_absolute_path = false; // for -agentpath vs -agentlib
2740
2741 const JavaVMOption* option = args->options + index;
2742
2743 if (!match_option(option, "-Djava.class.path", &tail) &&
2744 !match_option(option, "-Dsun.java.command", &tail) &&
2745 !match_option(option, "-Dsun.java.launcher", &tail)) {
2746
2747 // add all jvm options to the jvm_args string. This string
2748 // is used later to set the java.vm.args PerfData string constant.
2749 // the -Djava.class.path and the -Dsun.java.command options are
2750 // omitted from jvm_args string as each have their own PerfData
2751 // string constant object.
2752 build_jvm_args(option->optionString);
2753 }
2754
2755 // -verbose:[class/gc/jni]
2756 if (match_option(option, "-verbose", &tail)) {
2757 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2758 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2759 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2760 } else if (!strcmp(tail, ":gc")) {
2761 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2762 } else if (!strcmp(tail, ":jni")) {
2763 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 }
2767 // -da / -ea / -disableassertions / -enableassertions
2768 // These accept an optional class/package name separated by a colon, e.g.,
2769 // -da:java.lang.Thread.
2770 } else if (match_option(option, user_assertion_options, &tail, true)) {
2771 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2772 if (*tail == '\0') {
2773 JavaAssertions::setUserClassDefault(enable);
2774 } else {
2775 assert(*tail == ':', "bogus match by match_option()");
2776 JavaAssertions::addOption(tail + 1, enable);
2777 }
2778 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2779 } else if (match_option(option, system_assertion_options, &tail, false)) {
2780 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2781 JavaAssertions::setSystemClassDefault(enable);
2782 // -bootclasspath:
2783 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2784 jio_fprintf(defaultStream::output_stream(),
2785 "-Xbootclasspath is no longer a supported option.\n");
2786 return JNI_EINVAL;
2787 // -bootclasspath/a:
2788 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2789 Arguments::append_sysclasspath(tail);
2790 // -bootclasspath/p:
2791 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2792 jio_fprintf(defaultStream::output_stream(),
2793 "-Xbootclasspath/p is no longer a supported option.\n");
2794 return JNI_EINVAL;
2795 // -Xrun
2796 } else if (match_option(option, "-Xrun", &tail)) {
2797 if (tail != NULL) {
2798 const char* pos = strchr(tail, ':');
2799 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2800 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2801 jio_snprintf(name, len + 1, "%s", tail);
2802
2803 char *options = NULL;
2804 if(pos != NULL) {
2805 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2806 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2807 }
2808 #if !INCLUDE_JVMTI
2809 if (strcmp(name, "jdwp") == 0) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Debugging agents are not supported in this VM\n");
2812 return JNI_ERR;
2813 }
2814 #endif // !INCLUDE_JVMTI
2815 add_init_library(name, options);
2816 }
2817 } else if (match_option(option, "--add-reads=", &tail)) {
2818 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2819 return JNI_ENOMEM;
2820 }
2821 } else if (match_option(option, "--add-exports=", &tail)) {
2822 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2823 return JNI_ENOMEM;
2824 }
2825 } else if (match_option(option, "--add-opens=", &tail)) {
2826 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2827 return JNI_ENOMEM;
2828 }
2829 } else if (match_option(option, "--add-modules=", &tail)) {
2830 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2831 return JNI_ENOMEM;
2832 }
2833 } else if (match_option(option, "--limit-modules=", &tail)) {
2834 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2835 return JNI_ENOMEM;
2836 }
2837 } else if (match_option(option, "--module-path=", &tail)) {
2838 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2839 return JNI_ENOMEM;
2840 }
2841 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2842 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2843 return JNI_ENOMEM;
2844 }
2845 } else if (match_option(option, "--patch-module=", &tail)) {
2846 // --patch-module=<module>=<file>(<pathsep><file>)*
2847 int res = process_patch_mod_option(tail, patch_mod_javabase);
2848 if (res != JNI_OK) {
2849 return res;
2850 }
2851 // -agentlib and -agentpath
2852 } else if (match_option(option, "-agentlib:", &tail) ||
2853 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2854 if(tail != NULL) {
2855 const char* pos = strchr(tail, '=');
2856 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2857 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2858 name[len] = '\0';
2859
2860 char *options = NULL;
2861 if(pos != NULL) {
2862 options = os::strdup_check_oom(pos + 1, mtArguments);
2863 }
2864 #if !INCLUDE_JVMTI
2865 if (valid_jdwp_agent(name, is_absolute_path)) {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "Debugging agents are not supported in this VM\n");
2868 return JNI_ERR;
2869 }
2870 #endif // !INCLUDE_JVMTI
2871 add_init_agent(name, options, is_absolute_path);
2872 }
2873 // -javaagent
2874 } else if (match_option(option, "-javaagent:", &tail)) {
2875 #if !INCLUDE_JVMTI
2876 jio_fprintf(defaultStream::error_stream(),
2877 "Instrumentation agents are not supported in this VM\n");
2878 return JNI_ERR;
2879 #else
2880 if (tail != NULL) {
2881 size_t length = strlen(tail) + 1;
2882 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2883 jio_snprintf(options, length, "%s", tail);
2884 add_init_agent("instrument", options, false);
2885 // java agents need module java.instrument
2886 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2887 return JNI_ENOMEM;
2888 }
2889 }
2890 #endif // !INCLUDE_JVMTI
2891 // -Xnoclassgc
2892 } else if (match_option(option, "-Xnoclassgc")) {
2893 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 // -Xconcgc
2897 } else if (match_option(option, "-Xconcgc")) {
2898 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2899 return JNI_EINVAL;
2900 }
2901 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2902 // -Xnoconcgc
2903 } else if (match_option(option, "-Xnoconcgc")) {
2904 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2908 // -Xbatch
2909 } else if (match_option(option, "-Xbatch")) {
2910 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 // -Xmn for compatibility with other JVM vendors
2914 } else if (match_option(option, "-Xmn", &tail)) {
2915 julong long_initial_young_size = 0;
2916 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2917 if (errcode != arg_in_range) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Invalid initial young generation size: %s\n", option->optionString);
2920 describe_range_error(errcode);
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 // -Xms
2930 } else if (match_option(option, "-Xms", &tail)) {
2931 julong long_initial_heap_size = 0;
2932 // an initial heap size of 0 means automatically determine
2933 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2934 if (errcode != arg_in_range) {
2935 jio_fprintf(defaultStream::error_stream(),
2936 "Invalid initial heap size: %s\n", option->optionString);
2937 describe_range_error(errcode);
2938 return JNI_EINVAL;
2939 }
2940 set_min_heap_size((size_t)long_initial_heap_size);
2941 // Currently the minimum size and the initial heap sizes are the same.
2942 // Can be overridden with -XX:InitialHeapSize.
2943 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 // -Xmx
2947 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2948 julong long_max_heap_size = 0;
2949 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2950 if (errcode != arg_in_range) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Invalid maximum heap size: %s\n", option->optionString);
2953 describe_range_error(errcode);
2954 return JNI_EINVAL;
2955 }
2956 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 // Xmaxf
2960 } else if (match_option(option, "-Xmaxf", &tail)) {
2961 char* err;
2962 int maxf = (int)(strtod(tail, &err) * 100);
2963 if (*err != '\0' || *tail == '\0') {
2964 jio_fprintf(defaultStream::error_stream(),
2965 "Bad max heap free percentage size: %s\n",
2966 option->optionString);
2967 return JNI_EINVAL;
2968 } else {
2969 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 }
2973 // Xminf
2974 } else if (match_option(option, "-Xminf", &tail)) {
2975 char* err;
2976 int minf = (int)(strtod(tail, &err) * 100);
2977 if (*err != '\0' || *tail == '\0') {
2978 jio_fprintf(defaultStream::error_stream(),
2979 "Bad min heap free percentage size: %s\n",
2980 option->optionString);
2981 return JNI_EINVAL;
2982 } else {
2983 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 }
2987 // -Xss
2988 } else if (match_option(option, "-Xss", &tail)) {
2989 julong long_ThreadStackSize = 0;
2990 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2991 if (errcode != arg_in_range) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "Invalid thread stack size: %s\n", option->optionString);
2994 describe_range_error(errcode);
2995 return JNI_EINVAL;
2996 }
2997 // Internally track ThreadStackSize in units of 1024 bytes.
2998 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2999 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3000 return JNI_EINVAL;
3001 }
3002 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3003 } else if (match_option(option, "-Xoss", &tail) ||
3004 match_option(option, "-Xsqnopause") ||
3005 match_option(option, "-Xoptimize") ||
3006 match_option(option, "-Xboundthreads") ||
3007 match_option(option, "-Xusealtsigs")) {
3008 // All these options are deprecated in JDK 9 and will be removed in a future release
3009 char version[256];
3010 JDK_Version::jdk(9).to_string(version, sizeof(version));
3011 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3012 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3013 julong long_CodeCacheExpansionSize = 0;
3014 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3015 if (errcode != arg_in_range) {
3016 jio_fprintf(defaultStream::error_stream(),
3017 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3018 os::vm_page_size()/K);
3019 return JNI_EINVAL;
3020 }
3021 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3025 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3026 julong long_ReservedCodeCacheSize = 0;
3027
3028 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3029 if (errcode != arg_in_range) {
3030 jio_fprintf(defaultStream::error_stream(),
3031 "Invalid maximum code cache size: %s.\n", option->optionString);
3032 return JNI_EINVAL;
3033 }
3034 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 // -XX:NonNMethodCodeHeapSize=
3038 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3039 julong long_NonNMethodCodeHeapSize = 0;
3040
3041 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3042 if (errcode != arg_in_range) {
3043 jio_fprintf(defaultStream::error_stream(),
3044 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -XX:ProfiledCodeHeapSize=
3051 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3052 julong long_ProfiledCodeHeapSize = 0;
3053
3054 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3055 if (errcode != arg_in_range) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3058 return JNI_EINVAL;
3059 }
3060 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 // -XX:NonProfiledCodeHeapSizee=
3064 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3065 julong long_NonProfiledCodeHeapSize = 0;
3066
3067 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3068 if (errcode != arg_in_range) {
3069 jio_fprintf(defaultStream::error_stream(),
3070 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3071 return JNI_EINVAL;
3072 }
3073 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 // -green
3077 } else if (match_option(option, "-green")) {
3078 jio_fprintf(defaultStream::error_stream(),
3079 "Green threads support not available\n");
3080 return JNI_EINVAL;
3081 // -native
3082 } else if (match_option(option, "-native")) {
3083 // HotSpot always uses native threads, ignore silently for compatibility
3084 // -Xrs
3085 } else if (match_option(option, "-Xrs")) {
3086 // Classic/EVM option, new functionality
3087 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3088 return JNI_EINVAL;
3089 }
3090 // -Xprof
3091 } else if (match_option(option, "-Xprof")) {
3092 #if INCLUDE_FPROF
3093 _has_profile = true;
3094 #else // INCLUDE_FPROF
3095 jio_fprintf(defaultStream::error_stream(),
3096 "Flat profiling is not supported in this VM.\n");
3097 return JNI_ERR;
3098 #endif // INCLUDE_FPROF
3099 // -Xconcurrentio
3100 } else if (match_option(option, "-Xconcurrentio")) {
3101 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3102 return JNI_EINVAL;
3103 }
3104 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3114 return JNI_EINVAL;
3115 }
3116
3117 // -Xinternalversion
3118 } else if (match_option(option, "-Xinternalversion")) {
3119 jio_fprintf(defaultStream::output_stream(), "%s\n",
3120 VM_Version::internal_vm_info_string());
3121 vm_exit(0);
3122 #ifndef PRODUCT
3123 // -Xprintflags
3124 } else if (match_option(option, "-Xprintflags")) {
3125 CommandLineFlags::printFlags(tty, false);
3126 vm_exit(0);
3127 #endif
3128 // -D
3129 } else if (match_option(option, "-D", &tail)) {
3130 const char* value;
3131 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3132 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3133 // abort if -Djava.endorsed.dirs is set
3134 jio_fprintf(defaultStream::output_stream(),
3135 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3136 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3137 return JNI_EINVAL;
3138 }
3139 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3140 *value != '\0' && strcmp(value, "\"\"") != 0) {
3141 // abort if -Djava.ext.dirs is set
3142 jio_fprintf(defaultStream::output_stream(),
3143 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3144 return JNI_EINVAL;
3145 }
3146 // Check for module related properties. They must be set using the modules
3147 // options. For example: use "--add-modules=java.sql", not
3148 // "-Djdk.module.addmods=java.sql"
3149 if (is_internal_module_property(option->optionString + 2)) {
3150 needs_module_property_warning = true;
3151 continue;
3152 }
3153
3154 if (!add_property(tail)) {
3155 return JNI_ENOMEM;
3156 }
3157 // Out of the box management support
3158 if (match_option(option, "-Dcom.sun.management", &tail)) {
3159 #if INCLUDE_MANAGEMENT
3160 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 // management agent in module java.management
3164 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3165 return JNI_ENOMEM;
3166 }
3167 #else
3168 jio_fprintf(defaultStream::output_stream(),
3169 "-Dcom.sun.management is not supported in this VM.\n");
3170 return JNI_ERR;
3171 #endif
3172 }
3173 // -Xint
3174 } else if (match_option(option, "-Xint")) {
3175 set_mode_flags(_int);
3176 // -Xmixed
3177 } else if (match_option(option, "-Xmixed")) {
3178 set_mode_flags(_mixed);
3179 // -Xcomp
3180 } else if (match_option(option, "-Xcomp")) {
3181 // for testing the compiler; turn off all flags that inhibit compilation
3182 set_mode_flags(_comp);
3183 // -Xshare:dump
3184 } else if (match_option(option, "-Xshare:dump")) {
3185 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 set_mode_flags(_int); // Prevent compilation, which creates objects
3189 // -Xshare:on
3190 } else if (match_option(option, "-Xshare:on")) {
3191 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 // -Xshare:auto
3198 } else if (match_option(option, "-Xshare:auto")) {
3199 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3203 return JNI_EINVAL;
3204 }
3205 // -Xshare:off
3206 } else if (match_option(option, "-Xshare:off")) {
3207 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3208 return JNI_EINVAL;
3209 }
3210 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3211 return JNI_EINVAL;
3212 }
3213 // -Xverify
3214 } else if (match_option(option, "-Xverify", &tail)) {
3215 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3216 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3217 return JNI_EINVAL;
3218 }
3219 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3220 return JNI_EINVAL;
3221 }
3222 } else if (strcmp(tail, ":remote") == 0) {
3223 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3227 return JNI_EINVAL;
3228 }
3229 } else if (strcmp(tail, ":none") == 0) {
3230 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3234 return JNI_EINVAL;
3235 }
3236 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3237 return JNI_EINVAL;
3238 }
3239 // -Xdebug
3240 } else if (match_option(option, "-Xdebug")) {
3241 // note this flag has been used, then ignore
3242 set_xdebug_mode(true);
3243 // -Xnoagent
3244 } else if (match_option(option, "-Xnoagent")) {
3245 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3246 } else if (match_option(option, "-Xloggc:", &tail)) {
3247 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3248 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3249 _gc_log_filename = os::strdup_check_oom(tail);
3250 } else if (match_option(option, "-Xlog", &tail)) {
3251 bool ret = false;
3252 if (strcmp(tail, ":help") == 0) {
3253 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3254 vm_exit(0);
3255 } else if (strcmp(tail, ":disable") == 0) {
3256 LogConfiguration::disable_logging();
3257 ret = true;
3258 } else if (*tail == '\0') {
3259 ret = LogConfiguration::parse_command_line_arguments();
3260 assert(ret, "-Xlog without arguments should never fail to parse");
3261 } else if (*tail == ':') {
3262 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3263 }
3264 if (ret == false) {
3265 jio_fprintf(defaultStream::error_stream(),
3266 "Invalid -Xlog option '-Xlog%s'\n",
3267 tail);
3268 return JNI_EINVAL;
3269 }
3270 // JNI hooks
3271 } else if (match_option(option, "-Xcheck", &tail)) {
3272 if (!strcmp(tail, ":jni")) {
3273 #if !INCLUDE_JNI_CHECK
3274 warning("JNI CHECKING is not supported in this VM");
3275 #else
3276 CheckJNICalls = true;
3277 #endif // INCLUDE_JNI_CHECK
3278 } else if (is_bad_option(option, args->ignoreUnrecognized,
3279 "check")) {
3280 return JNI_EINVAL;
3281 }
3282 } else if (match_option(option, "vfprintf")) {
3283 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3284 } else if (match_option(option, "exit")) {
3285 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3286 } else if (match_option(option, "abort")) {
3287 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3288 // -XX:+AggressiveHeap
3289 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3290 jint result = set_aggressive_heap_flags();
3291 if (result != JNI_OK) {
3292 return result;
3293 }
3294 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3295 // and the last option wins.
3296 } else if (match_option(option, "-XX:+NeverTenure")) {
3297 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3298 return JNI_EINVAL;
3299 }
3300 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3307 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3308 return JNI_EINVAL;
3309 }
3310 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3311 return JNI_EINVAL;
3312 }
3313 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3314 return JNI_EINVAL;
3315 }
3316 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3317 uintx max_tenuring_thresh = 0;
3318 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3319 jio_fprintf(defaultStream::error_stream(),
3320 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3321 return JNI_EINVAL;
3322 }
3323
3324 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3325 return JNI_EINVAL;
3326 }
3327
3328 if (MaxTenuringThreshold == 0) {
3329 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3330 return JNI_EINVAL;
3331 }
3332 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 } else {
3336 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3337 return JNI_EINVAL;
3338 }
3339 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3340 return JNI_EINVAL;
3341 }
3342 }
3343 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3344 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3345 return JNI_EINVAL;
3346 }
3347 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3348 return JNI_EINVAL;
3349 }
3350 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3351 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3352 return JNI_EINVAL;
3353 }
3354 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3355 return JNI_EINVAL;
3356 }
3357 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3358 #if defined(DTRACE_ENABLED)
3359 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3360 return JNI_EINVAL;
3361 }
3362 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3363 return JNI_EINVAL;
3364 }
3365 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3366 return JNI_EINVAL;
3367 }
3368 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3369 return JNI_EINVAL;
3370 }
3371 #else // defined(DTRACE_ENABLED)
3372 jio_fprintf(defaultStream::error_stream(),
3373 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3374 return JNI_EINVAL;
3375 #endif // defined(DTRACE_ENABLED)
3376 #ifdef ASSERT
3377 } else if (match_option(option, "-XX:+FullGCALot")) {
3378 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3379 return JNI_EINVAL;
3380 }
3381 // disable scavenge before parallel mark-compact
3382 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 #endif
3386 #if !INCLUDE_MANAGEMENT
3387 } else if (match_option(option, "-XX:+ManagementServer")) {
3388 jio_fprintf(defaultStream::error_stream(),
3389 "ManagementServer is not supported in this VM.\n");
3390 return JNI_ERR;
3391 #endif // INCLUDE_MANAGEMENT
3392 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3393 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3394 // already been handled
3395 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3396 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3397 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3398 return JNI_EINVAL;
3399 }
3400 }
3401 // Unknown option
3402 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3403 return JNI_ERR;
3404 }
3405 }
3406
3407 // PrintSharedArchiveAndExit will turn on
3408 // -Xshare:on
3409 // -Xlog:class+path=info
3410 if (PrintSharedArchiveAndExit) {
3411 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3412 return JNI_EINVAL;
3413 }
3414 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3415 return JNI_EINVAL;
3416 }
3417 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3418 }
3419
3420 // Change the default value for flags which have different default values
3421 // when working with older JDKs.
3422 #ifdef LINUX
3423 if (JDK_Version::current().compare_major(6) <= 0 &&
3424 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3425 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3426 }
3427 #endif // LINUX
3428 fix_appclasspath();
3429 return JNI_OK;
3430 }
3431
3432 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3433 // For java.base check for duplicate --patch-module options being specified on the command line.
3434 // This check is only required for java.base, all other duplicate module specifications
3435 // will be checked during module system initialization. The module system initialization
3436 // will throw an ExceptionInInitializerError if this situation occurs.
3437 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3438 if (*patch_mod_javabase) {
3439 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3440 } else {
3441 *patch_mod_javabase = true;
3442 }
3443 }
3444
3445 // Create GrowableArray lazily, only if --patch-module has been specified
3446 if (_patch_mod_prefix == NULL) {
3447 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3448 }
3449
3450 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3451 }
3452
3453 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3454 //
3455 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3456 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3457 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3458 // path is treated as the current directory.
3459 //
3460 // This causes problems with CDS, which requires that all directories specified in the classpath
3461 // must be empty. In most cases, applications do NOT want to load classes from the current
3462 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3463 // scripts compatible with CDS.
3464 void Arguments::fix_appclasspath() {
3465 if (IgnoreEmptyClassPaths) {
3466 const char separator = *os::path_separator();
3467 const char* src = _java_class_path->value();
3468
3469 // skip over all the leading empty paths
3470 while (*src == separator) {
3471 src ++;
3472 }
3473
3474 char* copy = os::strdup_check_oom(src, mtArguments);
3475
3476 // trim all trailing empty paths
3477 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3478 *tail = '\0';
3479 }
3480
3481 char from[3] = {separator, separator, '\0'};
3482 char to [2] = {separator, '\0'};
3483 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3484 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3485 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3486 }
3487
3488 _java_class_path->set_writeable_value(copy);
3489 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3490 }
3491 }
3492
3493 static bool has_jar_files(const char* directory) {
3494 DIR* dir = os::opendir(directory);
3495 if (dir == NULL) return false;
3496
3497 struct dirent *entry;
3498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3499 bool hasJarFile = false;
3500 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3501 const char* name = entry->d_name;
3502 const char* ext = name + strlen(name) - 4;
3503 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3504 }
3505 FREE_C_HEAP_ARRAY(char, dbuf);
3506 os::closedir(dir);
3507 return hasJarFile ;
3508 }
3509
3510 static int check_non_empty_dirs(const char* path) {
3511 const char separator = *os::path_separator();
3512 const char* const end = path + strlen(path);
3513 int nonEmptyDirs = 0;
3514 while (path < end) {
3515 const char* tmp_end = strchr(path, separator);
3516 if (tmp_end == NULL) {
3517 if (has_jar_files(path)) {
3518 nonEmptyDirs++;
3519 jio_fprintf(defaultStream::output_stream(),
3520 "Non-empty directory: %s\n", path);
3521 }
3522 path = end;
3523 } else {
3524 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3525 memcpy(dirpath, path, tmp_end - path);
3526 dirpath[tmp_end - path] = '\0';
3527 if (has_jar_files(dirpath)) {
3528 nonEmptyDirs++;
3529 jio_fprintf(defaultStream::output_stream(),
3530 "Non-empty directory: %s\n", dirpath);
3531 }
3532 FREE_C_HEAP_ARRAY(char, dirpath);
3533 path = tmp_end + 1;
3534 }
3535 }
3536 return nonEmptyDirs;
3537 }
3538
3539 jint Arguments::finalize_vm_init_args() {
3540 // check if the default lib/endorsed directory exists; if so, error
3541 char path[JVM_MAXPATHLEN];
3542 const char* fileSep = os::file_separator();
3543 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3544
3545 if (CheckEndorsedAndExtDirs) {
3546 int nonEmptyDirs = 0;
3547 // check endorsed directory
3548 nonEmptyDirs += check_non_empty_dirs(path);
3549 // check the extension directories
3550 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3551 if (nonEmptyDirs > 0) {
3552 return JNI_ERR;
3553 }
3554 }
3555
3556 DIR* dir = os::opendir(path);
3557 if (dir != NULL) {
3558 jio_fprintf(defaultStream::output_stream(),
3559 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3560 "in modular form will be supported via the concept of upgradeable modules.\n");
3561 os::closedir(dir);
3562 return JNI_ERR;
3563 }
3564
3565 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3566 dir = os::opendir(path);
3567 if (dir != NULL) {
3568 jio_fprintf(defaultStream::output_stream(),
3569 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3570 "Use -classpath instead.\n.");
3571 os::closedir(dir);
3572 return JNI_ERR;
3573 }
3574
3575 // This must be done after all arguments have been processed.
3576 // java_compiler() true means set to "NONE" or empty.
3577 if (java_compiler() && !xdebug_mode()) {
3578 // For backwards compatibility, we switch to interpreted mode if
3579 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3580 // not specified.
3581 set_mode_flags(_int);
3582 }
3583
3584 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3585 // but like -Xint, leave compilation thresholds unaffected.
3586 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3587 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3588 set_mode_flags(_int);
3589 }
3590
3591 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3592 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3593 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3594 }
3595
3596 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3597 // Don't degrade server performance for footprint
3598 if (FLAG_IS_DEFAULT(UseLargePages) &&
3599 MaxHeapSize < LargePageHeapSizeThreshold) {
3600 // No need for large granularity pages w/small heaps.
3601 // Note that large pages are enabled/disabled for both the
3602 // Java heap and the code cache.
3603 FLAG_SET_DEFAULT(UseLargePages, false);
3604 }
3605
3606 #elif defined(COMPILER2)
3607 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3608 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3609 }
3610 #endif
3611
3612 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3613 UNSUPPORTED_OPTION(ProfileInterpreter);
3614 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3615 #endif
3616
3617 #ifndef TIERED
3618 // Tiered compilation is undefined.
3619 UNSUPPORTED_OPTION(TieredCompilation);
3620 #endif
3621
3622 #if INCLUDE_JVMCI
3623 if (EnableJVMCI &&
3624 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3625 return JNI_ENOMEM;
3626 }
3627 #endif
3628
3629 // If we are running in a headless jre, force java.awt.headless property
3630 // to be true unless the property has already been set.
3631 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3632 if (os::is_headless_jre()) {
3633 const char* headless = Arguments::get_property("java.awt.headless");
3634 if (headless == NULL) {
3635 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3636 if (headless_env == NULL) {
3637 if (!add_property("java.awt.headless=true")) {
3638 return JNI_ENOMEM;
3639 }
3640 } else {
3641 char buffer[256];
3642 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3643 if (!add_property(buffer)) {
3644 return JNI_ENOMEM;
3645 }
3646 }
3647 }
3648 }
3649
3650 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3651 // CMS can only be used with ParNew
3652 FLAG_SET_ERGO(bool, UseParNewGC, true);
3653 }
3654
3655 if (!check_vm_args_consistency()) {
3656 return JNI_ERR;
3657 }
3658
3659 return JNI_OK;
3660 }
3661
3662 // Helper class for controlling the lifetime of JavaVMInitArgs
3663 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3664 // deleted on the destruction of the ScopedVMInitArgs object.
3665 class ScopedVMInitArgs : public StackObj {
3666 private:
3667 JavaVMInitArgs _args;
3668 char* _container_name;
3669 bool _is_set;
3670 char* _vm_options_file_arg;
3671
3672 public:
3673 ScopedVMInitArgs(const char *container_name) {
3674 _args.version = JNI_VERSION_1_2;
3675 _args.nOptions = 0;
3676 _args.options = NULL;
3677 _args.ignoreUnrecognized = false;
3678 _container_name = (char *)container_name;
3679 _is_set = false;
3680 _vm_options_file_arg = NULL;
3681 }
3682
3683 // Populates the JavaVMInitArgs object represented by this
3684 // ScopedVMInitArgs object with the arguments in options. The
3685 // allocated memory is deleted by the destructor. If this method
3686 // returns anything other than JNI_OK, then this object is in a
3687 // partially constructed state, and should be abandoned.
3688 jint set_args(GrowableArray<JavaVMOption>* options) {
3689 _is_set = true;
3690 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3691 JavaVMOption, options->length(), mtArguments);
3692 if (options_arr == NULL) {
3693 return JNI_ENOMEM;
3694 }
3695 _args.options = options_arr;
3696
3697 for (int i = 0; i < options->length(); i++) {
3698 options_arr[i] = options->at(i);
3699 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3700 if (options_arr[i].optionString == NULL) {
3701 // Rely on the destructor to do cleanup.
3702 _args.nOptions = i;
3703 return JNI_ENOMEM;
3704 }
3705 }
3706
3707 _args.nOptions = options->length();
3708 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3709 return JNI_OK;
3710 }
3711
3712 JavaVMInitArgs* get() { return &_args; }
3713 char* container_name() { return _container_name; }
3714 bool is_set() { return _is_set; }
3715 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3716 char* vm_options_file_arg() { return _vm_options_file_arg; }
3717
3718 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3719 if (_vm_options_file_arg != NULL) {
3720 os::free(_vm_options_file_arg);
3721 }
3722 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3723 }
3724
3725 ~ScopedVMInitArgs() {
3726 if (_vm_options_file_arg != NULL) {
3727 os::free(_vm_options_file_arg);
3728 }
3729 if (_args.options == NULL) return;
3730 for (int i = 0; i < _args.nOptions; i++) {
3731 os::free(_args.options[i].optionString);
3732 }
3733 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3734 }
3735
3736 // Insert options into this option list, to replace option at
3737 // vm_options_file_pos (-XX:VMOptionsFile)
3738 jint insert(const JavaVMInitArgs* args,
3739 const JavaVMInitArgs* args_to_insert,
3740 const int vm_options_file_pos) {
3741 assert(_args.options == NULL, "shouldn't be set yet");
3742 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3743 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3744
3745 int length = args->nOptions + args_to_insert->nOptions - 1;
3746 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3747 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3748 for (int i = 0; i < args->nOptions; i++) {
3749 if (i == vm_options_file_pos) {
3750 // insert the new options starting at the same place as the
3751 // -XX:VMOptionsFile option
3752 for (int j = 0; j < args_to_insert->nOptions; j++) {
3753 options->push(args_to_insert->options[j]);
3754 }
3755 } else {
3756 options->push(args->options[i]);
3757 }
3758 }
3759 // make into options array
3760 jint result = set_args(options);
3761 delete options;
3762 return result;
3763 }
3764 };
3765
3766 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3767 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3768 }
3769
3770 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3771 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3772 }
3773
3774 jint Arguments::parse_options_environment_variable(const char* name,
3775 ScopedVMInitArgs* vm_args) {
3776 char *buffer = ::getenv(name);
3777
3778 // Don't check this environment variable if user has special privileges
3779 // (e.g. unix su command).
3780 if (buffer == NULL || os::have_special_privileges()) {
3781 return JNI_OK;
3782 }
3783
3784 if ((buffer = os::strdup(buffer)) == NULL) {
3785 return JNI_ENOMEM;
3786 }
3787
3788 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3789
3790 os::free(buffer);
3791 return retcode;
3792 }
3793
3794 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3795 // read file into buffer
3796 int fd = ::open(file_name, O_RDONLY);
3797 if (fd < 0) {
3798 jio_fprintf(defaultStream::error_stream(),
3799 "Could not open options file '%s'\n",
3800 file_name);
3801 return JNI_ERR;
3802 }
3803
3804 struct stat stbuf;
3805 int retcode = os::stat(file_name, &stbuf);
3806 if (retcode != 0) {
3807 jio_fprintf(defaultStream::error_stream(),
3808 "Could not stat options file '%s'\n",
3809 file_name);
3810 os::close(fd);
3811 return JNI_ERR;
3812 }
3813
3814 if (stbuf.st_size == 0) {
3815 // tell caller there is no option data and that is ok
3816 os::close(fd);
3817 return JNI_OK;
3818 }
3819
3820 // '+ 1' for NULL termination even with max bytes
3821 size_t bytes_alloc = stbuf.st_size + 1;
3822
3823 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3824 if (NULL == buf) {
3825 jio_fprintf(defaultStream::error_stream(),
3826 "Could not allocate read buffer for options file parse\n");
3827 os::close(fd);
3828 return JNI_ENOMEM;
3829 }
3830
3831 memset(buf, 0, bytes_alloc);
3832
3833 // Fill buffer
3834 // Use ::read() instead of os::read because os::read()
3835 // might do a thread state transition
3836 // and it is too early for that here
3837
3838 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3839 os::close(fd);
3840 if (bytes_read < 0) {
3841 FREE_C_HEAP_ARRAY(char, buf);
3842 jio_fprintf(defaultStream::error_stream(),
3843 "Could not read options file '%s'\n", file_name);
3844 return JNI_ERR;
3845 }
3846
3847 if (bytes_read == 0) {
3848 // tell caller there is no option data and that is ok
3849 FREE_C_HEAP_ARRAY(char, buf);
3850 return JNI_OK;
3851 }
3852
3853 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3854
3855 FREE_C_HEAP_ARRAY(char, buf);
3856 return retcode;
3857 }
3858
3859 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3860 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3861
3862 // some pointers to help with parsing
3863 char *buffer_end = buffer + buf_len;
3864 char *opt_hd = buffer;
3865 char *wrt = buffer;
3866 char *rd = buffer;
3867
3868 // parse all options
3869 while (rd < buffer_end) {
3870 // skip leading white space from the input string
3871 while (rd < buffer_end && isspace(*rd)) {
3872 rd++;
3873 }
3874
3875 if (rd >= buffer_end) {
3876 break;
3877 }
3878
3879 // Remember this is where we found the head of the token.
3880 opt_hd = wrt;
3881
3882 // Tokens are strings of non white space characters separated
3883 // by one or more white spaces.
3884 while (rd < buffer_end && !isspace(*rd)) {
3885 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3886 int quote = *rd; // matching quote to look for
3887 rd++; // don't copy open quote
3888 while (rd < buffer_end && *rd != quote) {
3889 // include everything (even spaces)
3890 // up until the close quote
3891 *wrt++ = *rd++; // copy to option string
3892 }
3893
3894 if (rd < buffer_end) {
3895 rd++; // don't copy close quote
3896 } else {
3897 // did not see closing quote
3898 jio_fprintf(defaultStream::error_stream(),
3899 "Unmatched quote in %s\n", name);
3900 delete options;
3901 return JNI_ERR;
3902 }
3903 } else {
3904 *wrt++ = *rd++; // copy to option string
3905 }
3906 }
3907
3908 // steal a white space character and set it to NULL
3909 *wrt++ = '\0';
3910 // We now have a complete token
3911
3912 JavaVMOption option;
3913 option.optionString = opt_hd;
3914 option.extraInfo = NULL;
3915
3916 options->append(option); // Fill in option
3917
3918 rd++; // Advance to next character
3919 }
3920
3921 // Fill out JavaVMInitArgs structure.
3922 jint status = vm_args->set_args(options);
3923
3924 delete options;
3925 return status;
3926 }
3927
3928 void Arguments::set_shared_spaces_flags() {
3929 if (DumpSharedSpaces) {
3930 if (FailOverToOldVerifier) {
3931 // Don't fall back to the old verifier on verification failure. If a
3932 // class fails verification with the split verifier, it might fail the
3933 // CDS runtime verifier constraint check. In that case, we don't want
3934 // to share the class. We only archive classes that pass the split verifier.
3935 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3936 }
3937
3938 if (RequireSharedSpaces) {
3939 warning("Cannot dump shared archive while using shared archive");
3940 }
3941 UseSharedSpaces = false;
3942 #ifdef _LP64
3943 if (!UseCompressedOops || !UseCompressedClassPointers) {
3944 vm_exit_during_initialization(
3945 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3946 }
3947 } else {
3948 if (!UseCompressedOops || !UseCompressedClassPointers) {
3949 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3950 }
3951 #endif
3952 }
3953 }
3954
3955 // Sharing support
3956 // Construct the path to the archive
3957 static char* get_shared_archive_path() {
3958 char *shared_archive_path;
3959 if (SharedArchiveFile == NULL) {
3960 char jvm_path[JVM_MAXPATHLEN];
3961 os::jvm_path(jvm_path, sizeof(jvm_path));
3962 char *end = strrchr(jvm_path, *os::file_separator());
3963 if (end != NULL) *end = '\0';
3964 size_t jvm_path_len = strlen(jvm_path);
3965 size_t file_sep_len = strlen(os::file_separator());
3966 const size_t len = jvm_path_len + file_sep_len + 20;
3967 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3968 if (shared_archive_path != NULL) {
3969 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3970 jvm_path, os::file_separator());
3971 }
3972 } else {
3973 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3974 }
3975 return shared_archive_path;
3976 }
3977
3978 #ifndef PRODUCT
3979 // Determine whether LogVMOutput should be implicitly turned on.
3980 static bool use_vm_log() {
3981 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3982 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3983 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3984 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3985 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3986 return true;
3987 }
3988
3989 #ifdef COMPILER1
3990 if (PrintC1Statistics) {
3991 return true;
3992 }
3993 #endif // COMPILER1
3994
3995 #ifdef COMPILER2
3996 if (PrintOptoAssembly || PrintOptoStatistics) {
3997 return true;
3998 }
3999 #endif // COMPILER2
4000
4001 return false;
4002 }
4003
4004 #endif // PRODUCT
4005
4006 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4007 for (int index = 0; index < args->nOptions; index++) {
4008 const JavaVMOption* option = args->options + index;
4009 const char* tail;
4010 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4011 return true;
4012 }
4013 }
4014 return false;
4015 }
4016
4017 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4018 const char* vm_options_file,
4019 const int vm_options_file_pos,
4020 ScopedVMInitArgs* vm_options_file_args,
4021 ScopedVMInitArgs* args_out) {
4022 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4023 if (code != JNI_OK) {
4024 return code;
4025 }
4026
4027 if (vm_options_file_args->get()->nOptions < 1) {
4028 return JNI_OK;
4029 }
4030
4031 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4032 jio_fprintf(defaultStream::error_stream(),
4033 "A VM options file may not refer to a VM options file. "
4034 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4035 "options file '%s' in options container '%s' is an error.\n",
4036 vm_options_file_args->vm_options_file_arg(),
4037 vm_options_file_args->container_name());
4038 return JNI_EINVAL;
4039 }
4040
4041 return args_out->insert(args, vm_options_file_args->get(),
4042 vm_options_file_pos);
4043 }
4044
4045 // Expand -XX:VMOptionsFile found in args_in as needed.
4046 // mod_args and args_out parameters may return values as needed.
4047 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4048 ScopedVMInitArgs* mod_args,
4049 JavaVMInitArgs** args_out) {
4050 jint code = match_special_option_and_act(args_in, mod_args);
4051 if (code != JNI_OK) {
4052 return code;
4053 }
4054
4055 if (mod_args->is_set()) {
4056 // args_in contains -XX:VMOptionsFile and mod_args contains the
4057 // original options from args_in along with the options expanded
4058 // from the VMOptionsFile. Return a short-hand to the caller.
4059 *args_out = mod_args->get();
4060 } else {
4061 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4062 }
4063 return JNI_OK;
4064 }
4065
4066 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4067 ScopedVMInitArgs* args_out) {
4068 // Remaining part of option string
4069 const char* tail;
4070 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4071
4072 for (int index = 0; index < args->nOptions; index++) {
4073 const JavaVMOption* option = args->options + index;
4074 if (ArgumentsExt::process_options(option)) {
4075 continue;
4076 }
4077 if (match_option(option, "-XX:Flags=", &tail)) {
4078 Arguments::set_jvm_flags_file(tail);
4079 continue;
4080 }
4081 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4082 if (vm_options_file_args.found_vm_options_file_arg()) {
4083 jio_fprintf(defaultStream::error_stream(),
4084 "The option '%s' is already specified in the options "
4085 "container '%s' so the specification of '%s' in the "
4086 "same options container is an error.\n",
4087 vm_options_file_args.vm_options_file_arg(),
4088 vm_options_file_args.container_name(),
4089 option->optionString);
4090 return JNI_EINVAL;
4091 }
4092 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4093 // If there's a VMOptionsFile, parse that
4094 jint code = insert_vm_options_file(args, tail, index,
4095 &vm_options_file_args, args_out);
4096 if (code != JNI_OK) {
4097 return code;
4098 }
4099 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4100 if (args_out->is_set()) {
4101 // The VMOptions file inserted some options so switch 'args'
4102 // to the new set of options, and continue processing which
4103 // preserves "last option wins" semantics.
4104 args = args_out->get();
4105 // The first option from the VMOptionsFile replaces the
4106 // current option. So we back track to process the
4107 // replacement option.
4108 index--;
4109 }
4110 continue;
4111 }
4112 if (match_option(option, "-XX:+PrintVMOptions")) {
4113 PrintVMOptions = true;
4114 continue;
4115 }
4116 if (match_option(option, "-XX:-PrintVMOptions")) {
4117 PrintVMOptions = false;
4118 continue;
4119 }
4120 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4121 IgnoreUnrecognizedVMOptions = true;
4122 continue;
4123 }
4124 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4125 IgnoreUnrecognizedVMOptions = false;
4126 continue;
4127 }
4128 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4129 CommandLineFlags::printFlags(tty, false);
4130 vm_exit(0);
4131 }
4132 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4133 #if INCLUDE_NMT
4134 // The launcher did not setup nmt environment variable properly.
4135 if (!MemTracker::check_launcher_nmt_support(tail)) {
4136 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4137 }
4138
4139 // Verify if nmt option is valid.
4140 if (MemTracker::verify_nmt_option()) {
4141 // Late initialization, still in single-threaded mode.
4142 if (MemTracker::tracking_level() >= NMT_summary) {
4143 MemTracker::init();
4144 }
4145 } else {
4146 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4147 }
4148 continue;
4149 #else
4150 jio_fprintf(defaultStream::error_stream(),
4151 "Native Memory Tracking is not supported in this VM\n");
4152 return JNI_ERR;
4153 #endif
4154 }
4155
4156 #ifndef PRODUCT
4157 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4158 CommandLineFlags::printFlags(tty, true);
4159 vm_exit(0);
4160 }
4161 #endif
4162 }
4163 return JNI_OK;
4164 }
4165
4166 static void print_options(const JavaVMInitArgs *args) {
4167 const char* tail;
4168 for (int index = 0; index < args->nOptions; index++) {
4169 const JavaVMOption *option = args->options + index;
4170 if (match_option(option, "-XX:", &tail)) {
4171 logOption(tail);
4172 }
4173 }
4174 }
4175
4176 bool Arguments::handle_deprecated_print_gc_flags() {
4177 if (PrintGC) {
4178 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4179 }
4180 if (PrintGCDetails) {
4181 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4182 }
4183
4184 if (_gc_log_filename != NULL) {
4185 // -Xloggc was used to specify a filename
4186 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4187
4188 LogTarget(Error, logging) target;
4189 LogStreamCHeap errstream(target);
4190 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4191 } else if (PrintGC || PrintGCDetails) {
4192 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4193 }
4194 return true;
4195 }
4196
4197 void Arguments::handle_extra_cms_flags(const char* msg) {
4198 SpecialFlag flag;
4199 const char *flag_name = "UseConcMarkSweepGC";
4200 if (lookup_special_flag(flag_name, flag)) {
4201 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4202 warning("%s", msg);
4203 }
4204 }
4205
4206 // Parse entry point called from JNI_CreateJavaVM
4207
4208 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4209 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4210
4211 // Initialize ranges, constraints and writeables
4212 CommandLineFlagRangeList::init();
4213 CommandLineFlagConstraintList::init();
4214 CommandLineFlagWriteableList::init();
4215
4216 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4217 const char* hotspotrc = ".hotspotrc";
4218 bool settings_file_specified = false;
4219 bool needs_hotspotrc_warning = false;
4220 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4221 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4222
4223 // Pointers to current working set of containers
4224 JavaVMInitArgs* cur_cmd_args;
4225 JavaVMInitArgs* cur_java_options_args;
4226 JavaVMInitArgs* cur_java_tool_options_args;
4227
4228 // Containers for modified/expanded options
4229 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4230 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4231 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4232
4233
4234 jint code =
4235 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4236 if (code != JNI_OK) {
4237 return code;
4238 }
4239
4240 code = parse_java_options_environment_variable(&initial_java_options_args);
4241 if (code != JNI_OK) {
4242 return code;
4243 }
4244
4245 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4246 &mod_java_tool_options_args,
4247 &cur_java_tool_options_args);
4248 if (code != JNI_OK) {
4249 return code;
4250 }
4251
4252 code = expand_vm_options_as_needed(initial_cmd_args,
4253 &mod_cmd_args,
4254 &cur_cmd_args);
4255 if (code != JNI_OK) {
4256 return code;
4257 }
4258
4259 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4260 &mod_java_options_args,
4261 &cur_java_options_args);
4262 if (code != JNI_OK) {
4263 return code;
4264 }
4265
4266 const char* flags_file = Arguments::get_jvm_flags_file();
4267 settings_file_specified = (flags_file != NULL);
4268
4269 if (IgnoreUnrecognizedVMOptions) {
4270 cur_cmd_args->ignoreUnrecognized = true;
4271 cur_java_tool_options_args->ignoreUnrecognized = true;
4272 cur_java_options_args->ignoreUnrecognized = true;
4273 }
4274
4275 // Parse specified settings file
4276 if (settings_file_specified) {
4277 if (!process_settings_file(flags_file, true,
4278 cur_cmd_args->ignoreUnrecognized)) {
4279 return JNI_EINVAL;
4280 }
4281 } else {
4282 #ifdef ASSERT
4283 // Parse default .hotspotrc settings file
4284 if (!process_settings_file(".hotspotrc", false,
4285 cur_cmd_args->ignoreUnrecognized)) {
4286 return JNI_EINVAL;
4287 }
4288 #else
4289 struct stat buf;
4290 if (os::stat(hotspotrc, &buf) == 0) {
4291 needs_hotspotrc_warning = true;
4292 }
4293 #endif
4294 }
4295
4296 if (PrintVMOptions) {
4297 print_options(cur_java_tool_options_args);
4298 print_options(cur_cmd_args);
4299 print_options(cur_java_options_args);
4300 }
4301
4302 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4303 jint result = parse_vm_init_args(cur_java_tool_options_args,
4304 cur_java_options_args,
4305 cur_cmd_args);
4306
4307 if (result != JNI_OK) {
4308 return result;
4309 }
4310
4311 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4312 SharedArchivePath = get_shared_archive_path();
4313 if (SharedArchivePath == NULL) {
4314 return JNI_ENOMEM;
4315 }
4316
4317 // Set up VerifySharedSpaces
4318 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4319 VerifySharedSpaces = true;
4320 }
4321
4322 // Delay warning until here so that we've had a chance to process
4323 // the -XX:-PrintWarnings flag
4324 if (needs_hotspotrc_warning) {
4325 warning("%s file is present but has been ignored. "
4326 "Run with -XX:Flags=%s to load the file.",
4327 hotspotrc, hotspotrc);
4328 }
4329
4330 if (needs_module_property_warning) {
4331 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4332 " names that are reserved for internal use.");
4333 }
4334
4335 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4336 UNSUPPORTED_OPTION(UseLargePages);
4337 #endif
4338
4339 ArgumentsExt::report_unsupported_options();
4340
4341 #ifndef PRODUCT
4342 if (TraceBytecodesAt != 0) {
4343 TraceBytecodes = true;
4344 }
4345 if (CountCompiledCalls) {
4346 if (UseCounterDecay) {
4347 warning("UseCounterDecay disabled because CountCalls is set");
4348 UseCounterDecay = false;
4349 }
4350 }
4351 #endif // PRODUCT
4352
4353 if (ScavengeRootsInCode == 0) {
4354 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4355 warning("Forcing ScavengeRootsInCode non-zero");
4356 }
4357 ScavengeRootsInCode = 1;
4358 }
4359
4360 if (!handle_deprecated_print_gc_flags()) {
4361 return JNI_EINVAL;
4362 }
4363
4364 // Set object alignment values.
4365 set_object_alignment();
4366
4367 #if !INCLUDE_CDS
4368 if (DumpSharedSpaces || RequireSharedSpaces) {
4369 jio_fprintf(defaultStream::error_stream(),
4370 "Shared spaces are not supported in this VM\n");
4371 return JNI_ERR;
4372 }
4373 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4374 warning("Shared spaces are not supported in this VM");
4375 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4376 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4377 }
4378 no_shared_spaces("CDS Disabled");
4379 #endif // INCLUDE_CDS
4380
4381 return JNI_OK;
4382 }
4383
4384 jint Arguments::apply_ergo() {
4385
4386 // Set flags based on ergonomics.
4387 set_ergonomics_flags();
4388
4389 set_shared_spaces_flags();
4390
4391 // Check the GC selections again.
4392 if (!check_gc_consistency()) {
4393 return JNI_EINVAL;
4394 }
4395
4396 if (TieredCompilation) {
4397 set_tiered_flags();
4398 } else {
4399 int max_compilation_policy_choice = 1;
4400 #ifdef COMPILER2
4401 max_compilation_policy_choice = 2;
4402 #endif
4403 // Check if the policy is valid.
4404 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4405 vm_exit_during_initialization(
4406 "Incompatible compilation policy selected", NULL);
4407 }
4408 // Scale CompileThreshold
4409 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4410 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4411 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4412 }
4413 }
4414
4415 #ifdef COMPILER2
4416 #ifndef PRODUCT
4417 if (PrintIdealGraphLevel > 0) {
4418 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4419 }
4420 #endif
4421 #endif
4422
4423 // Set heap size based on available physical memory
4424 set_heap_size();
4425
4426 ArgumentsExt::set_gc_specific_flags();
4427
4428 // Initialize Metaspace flags and alignments
4429 Metaspace::ergo_initialize();
4430
4431 // Set bytecode rewriting flags
4432 set_bytecode_flags();
4433
4434 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4435 jint code = set_aggressive_opts_flags();
4436 if (code != JNI_OK) {
4437 return code;
4438 }
4439
4440 // Turn off biased locking for locking debug mode flags,
4441 // which are subtly different from each other but neither works with
4442 // biased locking
4443 if (UseHeavyMonitors
4444 #ifdef COMPILER1
4445 || !UseFastLocking
4446 #endif // COMPILER1
4447 #if INCLUDE_JVMCI
4448 || !JVMCIUseFastLocking
4449 #endif
4450 ) {
4451 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4452 // flag set to true on command line; warn the user that they
4453 // can't enable biased locking here
4454 warning("Biased Locking is not supported with locking debug flags"
4455 "; ignoring UseBiasedLocking flag." );
4456 }
4457 UseBiasedLocking = false;
4458 }
4459
4460 #ifdef CC_INTERP
4461 // Clear flags not supported on zero.
4462 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4463 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4464 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4465 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4466 #endif // CC_INTERP
4467
4468 #ifdef COMPILER2
4469 if (!EliminateLocks) {
4470 EliminateNestedLocks = false;
4471 }
4472 if (!Inline) {
4473 IncrementalInline = false;
4474 }
4475 #ifndef PRODUCT
4476 if (!IncrementalInline) {
4477 AlwaysIncrementalInline = false;
4478 }
4479 #endif
4480 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4481 // nothing to use the profiling, turn if off
4482 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4483 }
4484 #endif
4485
4486 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4487 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4488 DebugNonSafepoints = true;
4489 }
4490
4491 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4492 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4493 }
4494
4495 if (UseOnStackReplacement && !UseLoopCounter) {
4496 warning("On-stack-replacement requires loop counters; enabling loop counters");
4497 FLAG_SET_DEFAULT(UseLoopCounter, true);
4498 }
4499
4500 #ifndef PRODUCT
4501 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4502 if (use_vm_log()) {
4503 LogVMOutput = true;
4504 }
4505 }
4506 #endif // PRODUCT
4507
4508 if (PrintCommandLineFlags) {
4509 CommandLineFlags::printSetFlags(tty);
4510 }
4511
4512 // Apply CPU specific policy for the BiasedLocking
4513 if (UseBiasedLocking) {
4514 if (!VM_Version::use_biased_locking() &&
4515 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4516 UseBiasedLocking = false;
4517 }
4518 }
4519 #ifdef COMPILER2
4520 if (!UseBiasedLocking || EmitSync != 0) {
4521 UseOptoBiasInlining = false;
4522 }
4523 #endif
4524
4525 return JNI_OK;
4526 }
4527
4528 jint Arguments::adjust_after_os() {
4529 if (UseNUMA) {
4530 if (UseParallelGC || UseParallelOldGC) {
4531 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4532 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4533 }
4534 }
4535 // UseNUMAInterleaving is set to ON for all collectors and
4536 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4537 // such as the parallel collector for Linux and Solaris will
4538 // interleave old gen and survivor spaces on top of NUMA
4539 // allocation policy for the eden space.
4540 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4541 // all platforms and ParallelGC on Windows will interleave all
4542 // of the heap spaces across NUMA nodes.
4543 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4544 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4545 }
4546 }
4547 return JNI_OK;
4548 }
4549
4550 int Arguments::PropertyList_count(SystemProperty* pl) {
4551 int count = 0;
4552 while(pl != NULL) {
4553 count++;
4554 pl = pl->next();
4555 }
4556 return count;
4557 }
4558
4559 // Return the number of readable properties.
4560 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4561 int count = 0;
4562 while(pl != NULL) {
4563 if (pl->is_readable()) {
4564 count++;
4565 }
4566 pl = pl->next();
4567 }
4568 return count;
4569 }
4570
4571 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4572 assert(key != NULL, "just checking");
4573 SystemProperty* prop;
4574 for (prop = pl; prop != NULL; prop = prop->next()) {
4575 if (strcmp(key, prop->key()) == 0) return prop->value();
4576 }
4577 return NULL;
4578 }
4579
4580 // Return the value of the requested property provided that it is a readable property.
4581 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4582 assert(key != NULL, "just checking");
4583 SystemProperty* prop;
4584 // Return the property value if the keys match and the property is not internal or
4585 // it's the special internal property "jdk.boot.class.path.append".
4586 for (prop = pl; prop != NULL; prop = prop->next()) {
4587 if (strcmp(key, prop->key()) == 0) {
4588 if (!prop->internal()) {
4589 return prop->value();
4590 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4591 return prop->value();
4592 } else {
4593 // Property is internal and not jdk.boot.class.path.append so return NULL.
4594 return NULL;
4595 }
4596 }
4597 }
4598 return NULL;
4599 }
4600
4601 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4602 int count = 0;
4603 const char* ret_val = NULL;
4604
4605 while(pl != NULL) {
4606 if(count >= index) {
4607 ret_val = pl->key();
4608 break;
4609 }
4610 count++;
4611 pl = pl->next();
4612 }
4613
4614 return ret_val;
4615 }
4616
4617 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4618 int count = 0;
4619 char* ret_val = NULL;
4620
4621 while(pl != NULL) {
4622 if(count >= index) {
4623 ret_val = pl->value();
4624 break;
4625 }
4626 count++;
4627 pl = pl->next();
4628 }
4629
4630 return ret_val;
4631 }
4632
4633 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4634 SystemProperty* p = *plist;
4635 if (p == NULL) {
4636 *plist = new_p;
4637 } else {
4638 while (p->next() != NULL) {
4639 p = p->next();
4640 }
4641 p->set_next(new_p);
4642 }
4643 }
4644
4645 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4646 bool writeable, bool internal) {
4647 if (plist == NULL)
4648 return;
4649
4650 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4651 PropertyList_add(plist, new_p);
4652 }
4653
4654 void Arguments::PropertyList_add(SystemProperty *element) {
4655 PropertyList_add(&_system_properties, element);
4656 }
4657
4658 // This add maintains unique property key in the list.
4659 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4660 PropertyAppendable append, PropertyWriteable writeable,
4661 PropertyInternal internal) {
4662 if (plist == NULL)
4663 return;
4664
4665 // If property key exist then update with new value.
4666 SystemProperty* prop;
4667 for (prop = *plist; prop != NULL; prop = prop->next()) {
4668 if (strcmp(k, prop->key()) == 0) {
4669 if (append == AppendProperty) {
4670 prop->append_value(v);
4671 } else {
4672 prop->set_value(v);
4673 }
4674 return;
4675 }
4676 }
4677
4678 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4679 }
4680
4681 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4682 // Returns true if all of the source pointed by src has been copied over to
4683 // the destination buffer pointed by buf. Otherwise, returns false.
4684 // Notes:
4685 // 1. If the length (buflen) of the destination buffer excluding the
4686 // NULL terminator character is not long enough for holding the expanded
4687 // pid characters, it also returns false instead of returning the partially
4688 // expanded one.
4689 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4690 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4691 char* buf, size_t buflen) {
4692 const char* p = src;
4693 char* b = buf;
4694 const char* src_end = &src[srclen];
4695 char* buf_end = &buf[buflen - 1];
4696
4697 while (p < src_end && b < buf_end) {
4698 if (*p == '%') {
4699 switch (*(++p)) {
4700 case '%': // "%%" ==> "%"
4701 *b++ = *p++;
4702 break;
4703 case 'p': { // "%p" ==> current process id
4704 // buf_end points to the character before the last character so
4705 // that we could write '\0' to the end of the buffer.
4706 size_t buf_sz = buf_end - b + 1;
4707 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4708
4709 // if jio_snprintf fails or the buffer is not long enough to hold
4710 // the expanded pid, returns false.
4711 if (ret < 0 || ret >= (int)buf_sz) {
4712 return false;
4713 } else {
4714 b += ret;
4715 assert(*b == '\0', "fail in copy_expand_pid");
4716 if (p == src_end && b == buf_end + 1) {
4717 // reach the end of the buffer.
4718 return true;
4719 }
4720 }
4721 p++;
4722 break;
4723 }
4724 default :
4725 *b++ = '%';
4726 }
4727 } else {
4728 *b++ = *p++;
4729 }
4730 }
4731 *b = '\0';
4732 return (p == src_end); // return false if not all of the source was copied
4733 }