1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciRuntime.hpp"
60 #endif
61 #if INCLUDE_ALL_GCS
62 #include "gc/cms/compactibleFreeListSpace.hpp"
63 #include "gc/g1/g1CollectedHeap.inline.hpp"
64 #include "gc/parallel/parallelScavengeHeap.hpp"
65 #endif // INCLUDE_ALL_GCS
66
67 // Note: This is a special bug reporting site for the JVM
68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
116 bool Arguments::_has_jimage = false;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 bool needs_module_property_warning = false;
166
167 #define MODULE_PROPERTY_PREFIX "jdk.module."
168 #define MODULE_PROPERTY_PREFIX_LEN 11
169 #define ADDEXPORTS "addexports"
170 #define ADDEXPORTS_LEN 10
171 #define ADDREADS "addreads"
172 #define ADDREADS_LEN 8
173 #define 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 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
382 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
383
384 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
385 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
388 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
389 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
392
393 // -------------- Obsolete Flags - sorted by expired_in --------------
394 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
395 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
396 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 #ifndef ZERO
408 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
410 #endif // ZERO
411 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
413 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
422 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
423 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
424
425 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
426 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
427 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
428 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
429 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
430 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
431 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
432 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
433 #endif
434
435 { NULL, JDK_Version(0), JDK_Version(0) }
436 };
437
438 // Flags that are aliases for other flags.
439 typedef struct {
440 const char* alias_name;
441 const char* real_name;
442 } AliasedFlag;
443
444 static AliasedFlag const aliased_jvm_flags[] = {
445 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
446 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
447 { "CMSMarkStackSize", "MarkStackSize" },
448 { "G1MarkStackSize", "MarkStackSize" },
449 { "ParallelMarkingThreads", "ConcGCThreads" },
450 { "ParallelCMSThreads", "ConcGCThreads" },
451 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
452 { NULL, NULL}
453 };
454
455 // NOTE: A compatibility request will be necessary for each alias to be removed.
456 static AliasedLoggingFlag const aliased_logging_flags[] = {
457 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
458 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
459 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
460 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
461 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
462 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
463 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
464 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
465 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
466 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
467 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
468 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
469 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
470 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
471 };
472
473 #ifndef PRODUCT
474 // These options are removed in jdk9. Remove this code for jdk10.
475 static AliasedFlag const removed_develop_logging_flags[] = {
476 { "TraceClassInitialization", "-Xlog:class+init" },
477 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
478 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
479 { "TraceItables", "-Xlog:itables=debug" },
480 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
481 { "TraceSafepoint", "-Xlog:safepoint=debug" },
482 { "TraceStartupTime", "-Xlog:startuptime" },
483 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
484 { "PrintVtables", "-Xlog:vtables=debug" },
485 { "VerboseVerification", "-Xlog:verification" },
486 { NULL, NULL }
487 };
488 #endif //PRODUCT
489
490 // Return true if "v" is less than "other", where "other" may be "undefined".
491 static bool version_less_than(JDK_Version v, JDK_Version other) {
492 assert(!v.is_undefined(), "must be defined");
493 if (!other.is_undefined() && v.compare(other) >= 0) {
494 return false;
495 } else {
496 return true;
497 }
498 }
499
500 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
501
502 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
503 // Allow extensions to have priority
504 if (lookup_special_flag_ext(flag_name, flag)) {
505 return true;
506 }
507
508 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
509 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
510 flag = special_jvm_flags[i];
511 return true;
512 }
513 }
514 return false;
515 }
516
517 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
518 assert(version != NULL, "Must provide a version buffer");
519 SpecialFlag flag;
520 if (lookup_special_flag(flag_name, flag)) {
521 if (!flag.obsolete_in.is_undefined()) {
522 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
523 *version = flag.obsolete_in;
524 return true;
525 }
526 }
527 }
528 return false;
529 }
530
531 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
532 assert(version != NULL, "Must provide a version buffer");
533 SpecialFlag flag;
534 if (lookup_special_flag(flag_name, flag)) {
535 if (!flag.deprecated_in.is_undefined()) {
536 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
537 version_less_than(JDK_Version::current(), flag.expired_in)) {
538 *version = flag.deprecated_in;
539 return 1;
540 } else {
541 return -1;
542 }
543 }
544 }
545 return 0;
546 }
547
548 #ifndef PRODUCT
549 const char* Arguments::removed_develop_logging_flag_name(const char* name){
550 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
551 const AliasedFlag& flag = removed_develop_logging_flags[i];
552 if (strcmp(flag.alias_name, name) == 0) {
553 return flag.real_name;
554 }
555 }
556 return NULL;
557 }
558 #endif // PRODUCT
559
560 const char* Arguments::real_flag_name(const char *flag_name) {
561 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
562 const AliasedFlag& flag_status = aliased_jvm_flags[i];
563 if (strcmp(flag_status.alias_name, flag_name) == 0) {
564 return flag_status.real_name;
565 }
566 }
567 return flag_name;
568 }
569
570 #ifdef ASSERT
571 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
572 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
573 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
574 return true;
575 }
576 }
577 return false;
578 }
579
580 static bool verify_special_jvm_flags() {
581 bool success = true;
582 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
583 const SpecialFlag& flag = special_jvm_flags[i];
584 if (lookup_special_flag(flag.name, i)) {
585 warning("Duplicate special flag declaration \"%s\"", flag.name);
586 success = false;
587 }
588 if (flag.deprecated_in.is_undefined() &&
589 flag.obsolete_in.is_undefined()) {
590 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
591 success = false;
592 }
593
594 if (!flag.deprecated_in.is_undefined()) {
595 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
596 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
597 success = false;
598 }
599
600 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
601 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
602 success = false;
603 }
604 }
605
606 if (!flag.obsolete_in.is_undefined()) {
607 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
608 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
609 success = false;
610 }
611
612 // if flag has become obsolete it should not have a "globals" flag defined anymore.
613 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
614 if (Flag::find_flag(flag.name) != NULL) {
615 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
616 success = false;
617 }
618 }
619 }
620
621 if (!flag.expired_in.is_undefined()) {
622 // if flag has become expired it should not have a "globals" flag defined anymore.
623 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
624 if (Flag::find_flag(flag.name) != NULL) {
625 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
626 success = false;
627 }
628 }
629 }
630
631 }
632 return success;
633 }
634 #endif
635
636 // Parses a size specification string.
637 bool Arguments::atojulong(const char *s, julong* result) {
638 julong n = 0;
639
640 // First char must be a digit. Don't allow negative numbers or leading spaces.
641 if (!isdigit(*s)) {
642 return false;
643 }
644
645 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
646 char* remainder;
647 errno = 0;
648 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
649 if (errno != 0) {
650 return false;
651 }
652
653 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
654 if (remainder == s || strlen(remainder) > 1) {
655 return false;
656 }
657
658 switch (*remainder) {
659 case 'T': case 't':
660 *result = n * G * K;
661 // Check for overflow.
662 if (*result/((julong)G * K) != n) return false;
663 return true;
664 case 'G': case 'g':
665 *result = n * G;
666 if (*result/G != n) return false;
667 return true;
668 case 'M': case 'm':
669 *result = n * M;
670 if (*result/M != n) return false;
671 return true;
672 case 'K': case 'k':
673 *result = n * K;
674 if (*result/K != n) return false;
675 return true;
676 case '\0':
677 *result = n;
678 return true;
679 default:
680 return false;
681 }
682 }
683
684 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
685 if (size < min_size) return arg_too_small;
686 // Check that size will fit in a size_t (only relevant on 32-bit)
687 if (size > max_uintx) return arg_too_big;
688 return arg_in_range;
689 }
690
691 // Describe an argument out of range error
692 void Arguments::describe_range_error(ArgsRange errcode) {
693 switch(errcode) {
694 case arg_too_big:
695 jio_fprintf(defaultStream::error_stream(),
696 "The specified size exceeds the maximum "
697 "representable size.\n");
698 break;
699 case arg_too_small:
700 case arg_unreadable:
701 case arg_in_range:
702 // do nothing for now
703 break;
704 default:
705 ShouldNotReachHere();
706 }
707 }
708
709 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
710 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
711 return true;
712 } else {
713 return false;
714 }
715 }
716
717 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
718 char* end;
719 errno = 0;
720 double v = strtod(value, &end);
721 if ((errno != 0) || (*end != 0)) {
722 return false;
723 }
724
725 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
726 return true;
727 }
728 return false;
729 }
730
731 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
732 julong v;
733 int int_v;
734 intx intx_v;
735 bool is_neg = false;
736 Flag* result = Flag::find_flag(name, strlen(name));
737
738 if (result == NULL) {
739 return false;
740 }
741
742 // Check the sign first since atojulong() parses only unsigned values.
743 if (*value == '-') {
744 if (!result->is_intx() && !result->is_int()) {
745 return false;
746 }
747 value++;
748 is_neg = true;
749 }
750 if (!Arguments::atojulong(value, &v)) {
751 return false;
752 }
753 if (result->is_int()) {
754 int_v = (int) v;
755 if (is_neg) {
756 int_v = -int_v;
757 }
758 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
759 } else if (result->is_uint()) {
760 uint uint_v = (uint) v;
761 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
762 } else if (result->is_intx()) {
763 intx_v = (intx) v;
764 if (is_neg) {
765 intx_v = -intx_v;
766 }
767 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
768 } else if (result->is_uintx()) {
769 uintx uintx_v = (uintx) v;
770 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
771 } else if (result->is_uint64_t()) {
772 uint64_t uint64_t_v = (uint64_t) v;
773 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
774 } else if (result->is_size_t()) {
775 size_t size_t_v = (size_t) v;
776 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
777 } else {
778 return false;
779 }
780 }
781
782 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
783 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
784 // Contract: CommandLineFlags always returns a pointer that needs freeing.
785 FREE_C_HEAP_ARRAY(char, value);
786 return true;
787 }
788
789 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
790 const char* old_value = "";
791 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
792 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
793 size_t new_len = strlen(new_value);
794 const char* value;
795 char* free_this_too = NULL;
796 if (old_len == 0) {
797 value = new_value;
798 } else if (new_len == 0) {
799 value = old_value;
800 } else {
801 size_t length = old_len + 1 + new_len + 1;
802 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
803 // each new setting adds another LINE to the switch:
804 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
805 value = buf;
806 free_this_too = buf;
807 }
808 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
809 // CommandLineFlags always returns a pointer that needs freeing.
810 FREE_C_HEAP_ARRAY(char, value);
811 if (free_this_too != NULL) {
812 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
813 FREE_C_HEAP_ARRAY(char, free_this_too);
814 }
815 return true;
816 }
817
818 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
819 const char* real_name = real_flag_name(arg);
820 JDK_Version since = JDK_Version();
821 switch (is_deprecated_flag(arg, &since)) {
822 case -1:
823 return NULL; // obsolete or expired, don't process normally
824 case 0:
825 return real_name;
826 case 1: {
827 if (warn) {
828 char version[256];
829 since.to_string(version, sizeof(version));
830 if (real_name != arg) {
831 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
832 arg, version, real_name);
833 } else {
834 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
835 arg, version);
836 }
837 }
838 return real_name;
839 }
840 }
841 ShouldNotReachHere();
842 return NULL;
843 }
844
845 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
846 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
847 // Set tagset string buffer at max size of 256, large enough for any alias tagset
848 const int max_tagset_size = 256;
849 int max_tagset_len = max_tagset_size - 1;
850 char tagset_buffer[max_tagset_size];
851 tagset_buffer[0] = '\0';
852
853 // Write tag-set for aliased logging option, in string list form
854 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
855 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
856 if (i > 0) {
857 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
858 }
859 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
860 }
861 if (!alf.exactMatch) {
862 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
863 }
864 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
865 (on) ? "+" : "-",
866 name,
867 tagset_buffer,
868 (on) ? LogLevel::name(alf.level) : "off");
869 }
870
871 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
872 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
873 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
874 if (strcmp(alf.alias_name, name) == 0) {
875 log_deprecated_flag(name, on, alf);
876 return alf;
877 }
878 }
879 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
880 return a;
881 }
882
883 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
884
885 // range of acceptable characters spelled out for portability reasons
886 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
887 #define BUFLEN 255
888 char name[BUFLEN+1];
889 char dummy;
890 const char* real_name;
891 bool warn_if_deprecated = true;
892
893 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
894 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
895 if (alf.alias_name != NULL){
896 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
897 return true;
898 }
899 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
900 if (real_name == NULL) {
901 return false;
902 }
903 return set_bool_flag(real_name, false, origin);
904 }
905 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
906 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
907 if (alf.alias_name != NULL){
908 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
909 return true;
910 }
911 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
912 if (real_name == NULL) {
913 return false;
914 }
915 return set_bool_flag(real_name, true, origin);
916 }
917
918 char punct;
919 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
920 const char* value = strchr(arg, '=') + 1;
921 Flag* flag;
922
923 // this scanf pattern matches both strings (handled here) and numbers (handled later))
924 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
925 if (alf.alias_name != NULL) {
926 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
927 return true;
928 }
929 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
930 if (real_name == NULL) {
931 return false;
932 }
933 flag = Flag::find_flag(real_name);
934 if (flag != NULL && flag->is_ccstr()) {
935 if (flag->ccstr_accumulates()) {
936 return append_to_string_flag(real_name, value, origin);
937 } else {
938 if (value[0] == '\0') {
939 value = NULL;
940 }
941 return set_string_flag(real_name, value, origin);
942 }
943 } else {
944 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
945 }
946 }
947
948 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
949 const char* value = strchr(arg, '=') + 1;
950 // -XX:Foo:=xxx will reset the string flag to the given value.
951 if (value[0] == '\0') {
952 value = NULL;
953 }
954 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
955 if (real_name == NULL) {
956 return false;
957 }
958 return set_string_flag(real_name, value, origin);
959 }
960
961 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
962 #define SIGNED_NUMBER_RANGE "[-0123456789]"
963 #define NUMBER_RANGE "[0123456789eE+-]"
964 char value[BUFLEN + 1];
965 char value2[BUFLEN + 1];
966 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
967 // Looks like a floating-point number -- try again with more lenient format string
968 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
969 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
970 if (real_name == NULL) {
971 return false;
972 }
973 return set_fp_numeric_flag(real_name, value, origin);
974 }
975 }
976
977 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
978 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
979 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
980 if (real_name == NULL) {
981 return false;
982 }
983 return set_numeric_flag(real_name, value, origin);
984 }
985
986 return false;
987 }
988
989 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
990 assert(bldarray != NULL, "illegal argument");
991
992 if (arg == NULL) {
993 return;
994 }
995
996 int new_count = *count + 1;
997
998 // expand the array and add arg to the last element
999 if (*bldarray == NULL) {
1000 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1001 } else {
1002 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1003 }
1004 (*bldarray)[*count] = os::strdup_check_oom(arg);
1005 *count = new_count;
1006 }
1007
1008 void Arguments::build_jvm_args(const char* arg) {
1009 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1010 }
1011
1012 void Arguments::build_jvm_flags(const char* arg) {
1013 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1014 }
1015
1016 // utility function to return a string that concatenates all
1017 // strings in a given char** array
1018 const char* Arguments::build_resource_string(char** args, int count) {
1019 if (args == NULL || count == 0) {
1020 return NULL;
1021 }
1022 size_t length = 0;
1023 for (int i = 0; i < count; i++) {
1024 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1025 }
1026 char* s = NEW_RESOURCE_ARRAY(char, length);
1027 char* dst = s;
1028 for (int j = 0; j < count; j++) {
1029 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1030 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1031 dst += offset;
1032 length -= offset;
1033 }
1034 return (const char*) s;
1035 }
1036
1037 void Arguments::print_on(outputStream* st) {
1038 st->print_cr("VM Arguments:");
1039 if (num_jvm_flags() > 0) {
1040 st->print("jvm_flags: "); print_jvm_flags_on(st);
1041 st->cr();
1042 }
1043 if (num_jvm_args() > 0) {
1044 st->print("jvm_args: "); print_jvm_args_on(st);
1045 st->cr();
1046 }
1047 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1048 if (_java_class_path != NULL) {
1049 char* path = _java_class_path->value();
1050 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1051 }
1052 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1053 }
1054
1055 void Arguments::print_summary_on(outputStream* st) {
1056 // Print the command line. Environment variables that are helpful for
1057 // reproducing the problem are written later in the hs_err file.
1058 // flags are from setting file
1059 if (num_jvm_flags() > 0) {
1060 st->print_raw("Settings File: ");
1061 print_jvm_flags_on(st);
1062 st->cr();
1063 }
1064 // args are the command line and environment variable arguments.
1065 st->print_raw("Command Line: ");
1066 if (num_jvm_args() > 0) {
1067 print_jvm_args_on(st);
1068 }
1069 // this is the classfile and any arguments to the java program
1070 if (java_command() != NULL) {
1071 st->print("%s", java_command());
1072 }
1073 st->cr();
1074 }
1075
1076 void Arguments::print_jvm_flags_on(outputStream* st) {
1077 if (_num_jvm_flags > 0) {
1078 for (int i=0; i < _num_jvm_flags; i++) {
1079 st->print("%s ", _jvm_flags_array[i]);
1080 }
1081 }
1082 }
1083
1084 void Arguments::print_jvm_args_on(outputStream* st) {
1085 if (_num_jvm_args > 0) {
1086 for (int i=0; i < _num_jvm_args; i++) {
1087 st->print("%s ", _jvm_args_array[i]);
1088 }
1089 }
1090 }
1091
1092 bool Arguments::process_argument(const char* arg,
1093 jboolean ignore_unrecognized,
1094 Flag::Flags origin) {
1095 JDK_Version since = JDK_Version();
1096
1097 if (parse_argument(arg, origin)) {
1098 return true;
1099 }
1100
1101 // Determine if the flag has '+', '-', or '=' characters.
1102 bool has_plus_minus = (*arg == '+' || *arg == '-');
1103 const char* const argname = has_plus_minus ? arg + 1 : arg;
1104
1105 size_t arg_len;
1106 const char* equal_sign = strchr(argname, '=');
1107 if (equal_sign == NULL) {
1108 arg_len = strlen(argname);
1109 } else {
1110 arg_len = equal_sign - argname;
1111 }
1112
1113 // Only make the obsolete check for valid arguments.
1114 if (arg_len <= BUFLEN) {
1115 // Construct a string which consists only of the argument name without '+', '-', or '='.
1116 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1117 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1118 if (is_obsolete_flag(stripped_argname, &since)) {
1119 char version[256];
1120 since.to_string(version, sizeof(version));
1121 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1122 return true;
1123 }
1124 #ifndef PRODUCT
1125 else {
1126 const char* replacement;
1127 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1128 log_warning(arguments)("%s has been removed. Please use %s instead.",
1129 stripped_argname,
1130 replacement);
1131 return false;
1132 }
1133 }
1134 #endif //PRODUCT
1135 }
1136
1137 // For locked flags, report a custom error message if available.
1138 // Otherwise, report the standard unrecognized VM option.
1139 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1140 if (found_flag != NULL) {
1141 char locked_message_buf[BUFLEN];
1142 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1143 if (strlen(locked_message_buf) == 0) {
1144 if (found_flag->is_bool() && !has_plus_minus) {
1145 jio_fprintf(defaultStream::error_stream(),
1146 "Missing +/- setting for VM option '%s'\n", argname);
1147 } else if (!found_flag->is_bool() && has_plus_minus) {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Unexpected +/- setting in VM option '%s'\n", argname);
1150 } else {
1151 jio_fprintf(defaultStream::error_stream(),
1152 "Improperly specified VM option '%s'\n", argname);
1153 }
1154 } else {
1155 #ifdef PRODUCT
1156 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1157 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1158 if (ignore_unrecognized && mismatched) {
1159 return true;
1160 }
1161 #endif
1162 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1163 }
1164 } else {
1165 if (ignore_unrecognized) {
1166 return true;
1167 }
1168 jio_fprintf(defaultStream::error_stream(),
1169 "Unrecognized VM option '%s'\n", argname);
1170 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1171 if (fuzzy_matched != NULL) {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Did you mean '%s%s%s'? ",
1174 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1175 fuzzy_matched->_name,
1176 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1177 }
1178 }
1179
1180 // allow for commandline "commenting out" options like -XX:#+Verbose
1181 return arg[0] == '#';
1182 }
1183
1184 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1185 FILE* stream = fopen(file_name, "rb");
1186 if (stream == NULL) {
1187 if (should_exist) {
1188 jio_fprintf(defaultStream::error_stream(),
1189 "Could not open settings file %s\n", file_name);
1190 return false;
1191 } else {
1192 return true;
1193 }
1194 }
1195
1196 char token[1024];
1197 int pos = 0;
1198
1199 bool in_white_space = true;
1200 bool in_comment = false;
1201 bool in_quote = false;
1202 char quote_c = 0;
1203 bool result = true;
1204
1205 int c = getc(stream);
1206 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1207 if (in_white_space) {
1208 if (in_comment) {
1209 if (c == '\n') in_comment = false;
1210 } else {
1211 if (c == '#') in_comment = true;
1212 else if (!isspace(c)) {
1213 in_white_space = false;
1214 token[pos++] = c;
1215 }
1216 }
1217 } else {
1218 if (c == '\n' || (!in_quote && isspace(c))) {
1219 // token ends at newline, or at unquoted whitespace
1220 // this allows a way to include spaces in string-valued options
1221 token[pos] = '\0';
1222 logOption(token);
1223 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1224 build_jvm_flags(token);
1225 pos = 0;
1226 in_white_space = true;
1227 in_quote = false;
1228 } else if (!in_quote && (c == '\'' || c == '"')) {
1229 in_quote = true;
1230 quote_c = c;
1231 } else if (in_quote && (c == quote_c)) {
1232 in_quote = false;
1233 } else {
1234 token[pos++] = c;
1235 }
1236 }
1237 c = getc(stream);
1238 }
1239 if (pos > 0) {
1240 token[pos] = '\0';
1241 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1242 build_jvm_flags(token);
1243 }
1244 fclose(stream);
1245 return result;
1246 }
1247
1248 //=============================================================================================================
1249 // Parsing of properties (-D)
1250
1251 const char* Arguments::get_property(const char* key) {
1252 return PropertyList_get_value(system_properties(), key);
1253 }
1254
1255 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1256 const char* eq = strchr(prop, '=');
1257 const char* key;
1258 const char* value = "";
1259
1260 if (eq == NULL) {
1261 // property doesn't have a value, thus use passed string
1262 key = prop;
1263 } else {
1264 // property have a value, thus extract it and save to the
1265 // allocated string
1266 size_t key_len = eq - prop;
1267 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1268
1269 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1270 key = tmp_key;
1271
1272 value = &prop[key_len + 1];
1273 }
1274
1275 if (strcmp(key, "java.compiler") == 0) {
1276 process_java_compiler_argument(value);
1277 // Record value in Arguments, but let it get passed to Java.
1278 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1279 strcmp(key, "sun.java.launcher.pid") == 0) {
1280 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1281 // private and are processed in process_sun_java_launcher_properties();
1282 // the sun.java.launcher property is passed on to the java application
1283 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1284 // append is true, writable is true, internal is false
1285 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1286 WriteableProperty, ExternalProperty);
1287 } else {
1288 if (strcmp(key, "sun.java.command") == 0) {
1289 char *old_java_command = _java_command;
1290 _java_command = os::strdup_check_oom(value, mtArguments);
1291 if (old_java_command != NULL) {
1292 os::free(old_java_command);
1293 }
1294 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1295 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1296 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1297 // its value without going through the property list or making a Java call.
1298 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1299 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1300 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1301 os::free((void *)old_java_vendor_url_bug);
1302 }
1303 }
1304
1305 // Create new property and add at the end of the list
1306 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1307 }
1308
1309 if (key != prop) {
1310 // SystemProperty copy passed value, thus free previously allocated
1311 // memory
1312 FreeHeap((void *)key);
1313 }
1314
1315 return true;
1316 }
1317
1318 #if INCLUDE_CDS
1319 void Arguments::check_unsupported_dumping_properties() {
1320 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1321 const char* unsupported_properties[5] = { "jdk.module.main",
1322 "jdk.module.path",
1323 "jdk.module.upgrade.path",
1324 "jdk.module.addmods.0",
1325 "jdk.module.limitmods" };
1326 const char* unsupported_options[5] = { "-m",
1327 "--module-path",
1328 "--upgrade-module-path",
1329 "--add-modules",
1330 "--limit-modules" };
1331 SystemProperty* sp = system_properties();
1332 while (sp != NULL) {
1333 for (int i = 0; i < 5; i++) {
1334 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1335 vm_exit_during_initialization(
1336 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1337 }
1338 }
1339 sp = sp->next();
1340 }
1341
1342 // Check for an exploded module build in use with -Xshare:dump.
1343 if (!has_jimage()) {
1344 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1345 }
1346 }
1347 #endif
1348
1349 //===========================================================================================================
1350 // Setting int/mixed/comp mode flags
1351
1352 void Arguments::set_mode_flags(Mode mode) {
1353 // Set up default values for all flags.
1354 // If you add a flag to any of the branches below,
1355 // add a default value for it here.
1356 set_java_compiler(false);
1357 _mode = mode;
1358
1359 // Ensure Agent_OnLoad has the correct initial values.
1360 // This may not be the final mode; mode may change later in onload phase.
1361 PropertyList_unique_add(&_system_properties, "java.vm.info",
1362 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1363
1364 UseInterpreter = true;
1365 UseCompiler = true;
1366 UseLoopCounter = true;
1367
1368 // Default values may be platform/compiler dependent -
1369 // use the saved values
1370 ClipInlining = Arguments::_ClipInlining;
1371 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1372 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1373 BackgroundCompilation = Arguments::_BackgroundCompilation;
1374 if (TieredCompilation) {
1375 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1376 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1377 }
1378 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1379 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1380 }
1381 }
1382
1383 // Change from defaults based on mode
1384 switch (mode) {
1385 default:
1386 ShouldNotReachHere();
1387 break;
1388 case _int:
1389 UseCompiler = false;
1390 UseLoopCounter = false;
1391 AlwaysCompileLoopMethods = false;
1392 UseOnStackReplacement = false;
1393 break;
1394 case _mixed:
1395 // same as default
1396 break;
1397 case _comp:
1398 UseInterpreter = false;
1399 BackgroundCompilation = false;
1400 ClipInlining = false;
1401 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1402 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1403 // compile a level 4 (C2) and then continue executing it.
1404 if (TieredCompilation) {
1405 Tier3InvokeNotifyFreqLog = 0;
1406 Tier4InvocationThreshold = 0;
1407 }
1408 break;
1409 }
1410 }
1411
1412 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1413 // Conflict: required to use shared spaces (-Xshare:on), but
1414 // incompatible command line options were chosen.
1415
1416 static void no_shared_spaces(const char* message) {
1417 if (RequireSharedSpaces) {
1418 jio_fprintf(defaultStream::error_stream(),
1419 "Class data sharing is inconsistent with other specified options.\n");
1420 vm_exit_during_initialization("Unable to use shared archive.", message);
1421 } else {
1422 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1423 }
1424 }
1425 #endif
1426
1427 // Returns threshold scaled with the value of scale.
1428 // If scale < 0.0, threshold is returned without scaling.
1429 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1430 if (scale == 1.0 || scale < 0.0) {
1431 return threshold;
1432 } else {
1433 return (intx)(threshold * scale);
1434 }
1435 }
1436
1437 // Returns freq_log scaled with the value of scale.
1438 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1439 // If scale < 0.0, freq_log is returned without scaling.
1440 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1441 // Check if scaling is necessary or if negative value was specified.
1442 if (scale == 1.0 || scale < 0.0) {
1443 return freq_log;
1444 }
1445 // Check values to avoid calculating log2 of 0.
1446 if (scale == 0.0 || freq_log == 0) {
1447 return 0;
1448 }
1449 // Determine the maximum notification frequency value currently supported.
1450 // The largest mask value that the interpreter/C1 can handle is
1451 // of length InvocationCounter::number_of_count_bits. Mask values are always
1452 // one bit shorter then the value of the notification frequency. Set
1453 // max_freq_bits accordingly.
1454 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1455 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1456 if (scaled_freq == 0) {
1457 // Return 0 right away to avoid calculating log2 of 0.
1458 return 0;
1459 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1460 return max_freq_bits;
1461 } else {
1462 return log2_intptr(scaled_freq);
1463 }
1464 }
1465
1466 void Arguments::set_tiered_flags() {
1467 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1468 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1469 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1470 }
1471 if (CompilationPolicyChoice < 2) {
1472 vm_exit_during_initialization(
1473 "Incompatible compilation policy selected", NULL);
1474 }
1475 // Increase the code cache size - tiered compiles a lot more.
1476 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1477 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1478 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1479 }
1480 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1481 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1482 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1483 }
1484 if (!UseInterpreter) { // -Xcomp
1485 Tier3InvokeNotifyFreqLog = 0;
1486 Tier4InvocationThreshold = 0;
1487 }
1488
1489 if (CompileThresholdScaling < 0) {
1490 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1491 }
1492
1493 // Scale tiered compilation thresholds.
1494 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1495 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1496 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1497 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1498
1499 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1500 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1501 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1502 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1503
1504 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1505 // once these thresholds become supported.
1506
1507 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1508 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1509
1510 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1511 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1512
1513 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1514
1515 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1516 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1517 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1518 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1519 }
1520 }
1521
1522 #if INCLUDE_ALL_GCS
1523 static void disable_adaptive_size_policy(const char* collector_name) {
1524 if (UseAdaptiveSizePolicy) {
1525 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1526 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1527 collector_name);
1528 }
1529 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1530 }
1531 }
1532
1533 void Arguments::set_parnew_gc_flags() {
1534 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1535 "control point invariant");
1536 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1537 assert(UseParNewGC, "ParNew should always be used with CMS");
1538
1539 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1540 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1541 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1542 } else if (ParallelGCThreads == 0) {
1543 jio_fprintf(defaultStream::error_stream(),
1544 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1545 vm_exit(1);
1546 }
1547
1548 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1549 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1550 // we set them to 1024 and 1024.
1551 // See CR 6362902.
1552 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1553 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1554 }
1555 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1556 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1557 }
1558
1559 // When using compressed oops, we use local overflow stacks,
1560 // rather than using a global overflow list chained through
1561 // the klass word of the object's pre-image.
1562 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1563 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1564 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1565 }
1566 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1567 }
1568 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1569 }
1570
1571 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1572 // sparc/solaris for certain applications, but would gain from
1573 // further optimization and tuning efforts, and would almost
1574 // certainly gain from analysis of platform and environment.
1575 void Arguments::set_cms_and_parnew_gc_flags() {
1576 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1577 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1578 assert(UseParNewGC, "ParNew should always be used with CMS");
1579
1580 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1581 disable_adaptive_size_policy("UseConcMarkSweepGC");
1582
1583 set_parnew_gc_flags();
1584
1585 size_t max_heap = align_size_down(MaxHeapSize,
1586 CardTableRS::ct_max_alignment_constraint());
1587
1588 // Now make adjustments for CMS
1589 intx tenuring_default = (intx)6;
1590 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1591
1592 // Preferred young gen size for "short" pauses:
1593 // upper bound depends on # of threads and NewRatio.
1594 const size_t preferred_max_new_size_unaligned =
1595 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1596 size_t preferred_max_new_size =
1597 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1598
1599 // Unless explicitly requested otherwise, size young gen
1600 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1601
1602 // If either MaxNewSize or NewRatio is set on the command line,
1603 // assume the user is trying to set the size of the young gen.
1604 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1605
1606 // Set MaxNewSize to our calculated preferred_max_new_size unless
1607 // NewSize was set on the command line and it is larger than
1608 // preferred_max_new_size.
1609 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1610 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1611 } else {
1612 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1613 }
1614 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1615
1616 // Code along this path potentially sets NewSize and OldSize
1617 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1618 min_heap_size(), InitialHeapSize, max_heap);
1619 size_t min_new = preferred_max_new_size;
1620 if (FLAG_IS_CMDLINE(NewSize)) {
1621 min_new = NewSize;
1622 }
1623 if (max_heap > min_new && min_heap_size() > min_new) {
1624 // Unless explicitly requested otherwise, make young gen
1625 // at least min_new, and at most preferred_max_new_size.
1626 if (FLAG_IS_DEFAULT(NewSize)) {
1627 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1628 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1629 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1630 }
1631 // Unless explicitly requested otherwise, size old gen
1632 // so it's NewRatio x of NewSize.
1633 if (FLAG_IS_DEFAULT(OldSize)) {
1634 if (max_heap > NewSize) {
1635 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1636 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1637 }
1638 }
1639 }
1640 }
1641 // Unless explicitly requested otherwise, definitely
1642 // promote all objects surviving "tenuring_default" scavenges.
1643 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1644 FLAG_IS_DEFAULT(SurvivorRatio)) {
1645 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1646 }
1647 // If we decided above (or user explicitly requested)
1648 // `promote all' (via MaxTenuringThreshold := 0),
1649 // prefer minuscule survivor spaces so as not to waste
1650 // space for (non-existent) survivors
1651 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1652 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1653 }
1654
1655 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1656 // but rather the number of free blocks of a given size that are used when
1657 // replenishing the local per-worker free list caches.
1658 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1659 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1660 // OldPLAB sizing manually turned off: Use a larger default setting,
1661 // unless it was manually specified. This is because a too-low value
1662 // will slow down scavenges.
1663 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1664 } else {
1665 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1666 }
1667 }
1668
1669 // If either of the static initialization defaults have changed, note this
1670 // modification.
1671 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1672 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1673 }
1674
1675 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1676 }
1677 #endif // INCLUDE_ALL_GCS
1678
1679 void set_object_alignment() {
1680 // Object alignment.
1681 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1682 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1683 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1684 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1685 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1686 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1687
1688 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1689 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1690
1691 // Oop encoding heap max
1692 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1693
1694 if (SurvivorAlignmentInBytes == 0) {
1695 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1696 }
1697
1698 #if INCLUDE_ALL_GCS
1699 // Set CMS global values
1700 CompactibleFreeListSpace::set_cms_values();
1701 #endif // INCLUDE_ALL_GCS
1702 }
1703
1704 size_t Arguments::max_heap_for_compressed_oops() {
1705 // Avoid sign flip.
1706 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1707 // We need to fit both the NULL page and the heap into the memory budget, while
1708 // keeping alignment constraints of the heap. To guarantee the latter, as the
1709 // NULL page is located before the heap, we pad the NULL page to the conservative
1710 // maximum alignment that the GC may ever impose upon the heap.
1711 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1712 _conservative_max_heap_alignment);
1713
1714 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1715 NOT_LP64(ShouldNotReachHere(); return 0);
1716 }
1717
1718 bool Arguments::should_auto_select_low_pause_collector() {
1719 if (UseAutoGCSelectPolicy &&
1720 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1721 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1722 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1723 return true;
1724 }
1725 return false;
1726 }
1727
1728 void Arguments::set_use_compressed_oops() {
1729 #ifndef ZERO
1730 #ifdef _LP64
1731 // MaxHeapSize is not set up properly at this point, but
1732 // the only value that can override MaxHeapSize if we are
1733 // to use UseCompressedOops is InitialHeapSize.
1734 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1735
1736 if (max_heap_size <= max_heap_for_compressed_oops()) {
1737 #if !defined(COMPILER1) || defined(TIERED)
1738 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1739 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1740 }
1741 #endif
1742 } else {
1743 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1744 warning("Max heap size too large for Compressed Oops");
1745 FLAG_SET_DEFAULT(UseCompressedOops, false);
1746 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1747 }
1748 }
1749 #endif // _LP64
1750 #endif // ZERO
1751 }
1752
1753
1754 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1755 // set_use_compressed_oops().
1756 void Arguments::set_use_compressed_klass_ptrs() {
1757 #ifndef ZERO
1758 #ifdef _LP64
1759 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1760 if (!UseCompressedOops) {
1761 if (UseCompressedClassPointers) {
1762 warning("UseCompressedClassPointers requires UseCompressedOops");
1763 }
1764 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1765 } else {
1766 // Turn on UseCompressedClassPointers too
1767 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1768 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1769 }
1770 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1771 if (UseCompressedClassPointers) {
1772 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1773 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1774 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1775 }
1776 }
1777 }
1778 #endif // _LP64
1779 #endif // !ZERO
1780 }
1781
1782 void Arguments::set_conservative_max_heap_alignment() {
1783 // The conservative maximum required alignment for the heap is the maximum of
1784 // the alignments imposed by several sources: any requirements from the heap
1785 // itself, the collector policy and the maximum page size we may run the VM
1786 // with.
1787 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1788 #if INCLUDE_ALL_GCS
1789 if (UseParallelGC) {
1790 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1791 } else if (UseG1GC) {
1792 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1793 }
1794 #endif // INCLUDE_ALL_GCS
1795 _conservative_max_heap_alignment = MAX4(heap_alignment,
1796 (size_t)os::vm_allocation_granularity(),
1797 os::max_page_size(),
1798 CollectorPolicy::compute_heap_alignment());
1799 }
1800
1801 bool Arguments::gc_selected() {
1802 #if INCLUDE_ALL_GCS
1803 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1804 #else
1805 return UseSerialGC;
1806 #endif // INCLUDE_ALL_GCS
1807 }
1808
1809 void Arguments::select_gc_ergonomically() {
1810 #if INCLUDE_ALL_GCS
1811 if (os::is_server_class_machine()) {
1812 if (!UseAutoGCSelectPolicy) {
1813 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1814 } else {
1815 if (should_auto_select_low_pause_collector()) {
1816 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1817 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1818 } else {
1819 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1820 }
1821 }
1822 } else {
1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1824 }
1825 #else
1826 UNSUPPORTED_OPTION(UseG1GC);
1827 UNSUPPORTED_OPTION(UseParallelGC);
1828 UNSUPPORTED_OPTION(UseParallelOldGC);
1829 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1830 UNSUPPORTED_OPTION(UseParNewGC);
1831 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1832 #endif // INCLUDE_ALL_GCS
1833 }
1834
1835 void Arguments::select_gc() {
1836 if (!gc_selected()) {
1837 select_gc_ergonomically();
1838 if (!gc_selected()) {
1839 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1840 }
1841 }
1842 }
1843
1844 void Arguments::set_ergonomics_flags() {
1845 select_gc();
1846
1847 #if defined(COMPILER2) || INCLUDE_JVMCI
1848 // Shared spaces work fine with other GCs but causes bytecode rewriting
1849 // to be disabled, which hurts interpreter performance and decreases
1850 // server performance. When -server is specified, keep the default off
1851 // unless it is asked for. Future work: either add bytecode rewriting
1852 // at link time, or rewrite bytecodes in non-shared methods.
1853 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1854 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1855 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1856 }
1857 #endif
1858
1859 set_conservative_max_heap_alignment();
1860
1861 #ifndef ZERO
1862 #ifdef _LP64
1863 set_use_compressed_oops();
1864
1865 // set_use_compressed_klass_ptrs() must be called after calling
1866 // set_use_compressed_oops().
1867 set_use_compressed_klass_ptrs();
1868
1869 // Also checks that certain machines are slower with compressed oops
1870 // in vm_version initialization code.
1871 #endif // _LP64
1872 #endif // !ZERO
1873
1874 CodeCacheExtensions::set_ergonomics_flags();
1875 }
1876
1877 void Arguments::set_parallel_gc_flags() {
1878 assert(UseParallelGC || UseParallelOldGC, "Error");
1879 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1880 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1881 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1882 }
1883 FLAG_SET_DEFAULT(UseParallelGC, true);
1884
1885 // If no heap maximum was requested explicitly, use some reasonable fraction
1886 // of the physical memory, up to a maximum of 1GB.
1887 FLAG_SET_DEFAULT(ParallelGCThreads,
1888 Abstract_VM_Version::parallel_worker_threads());
1889 if (ParallelGCThreads == 0) {
1890 jio_fprintf(defaultStream::error_stream(),
1891 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1892 vm_exit(1);
1893 }
1894
1895 if (UseAdaptiveSizePolicy) {
1896 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1897 // unless the user actually sets these flags.
1898 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1899 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1900 }
1901 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1902 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1903 }
1904 }
1905
1906 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1907 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1908 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1909 // See CR 6362902 for details.
1910 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1911 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1912 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1913 }
1914 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1915 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1916 }
1917 }
1918
1919 if (UseParallelOldGC) {
1920 // Par compact uses lower default values since they are treated as
1921 // minimums. These are different defaults because of the different
1922 // interpretation and are not ergonomically set.
1923 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1924 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1925 }
1926 }
1927 }
1928
1929 void Arguments::set_g1_gc_flags() {
1930 assert(UseG1GC, "Error");
1931 #if defined(COMPILER1) || INCLUDE_JVMCI
1932 FastTLABRefill = false;
1933 #endif
1934 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1935 if (ParallelGCThreads == 0) {
1936 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1937 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1938 }
1939
1940 #if INCLUDE_ALL_GCS
1941 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1942 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1943 }
1944 #endif
1945
1946 // MarkStackSize will be set (if it hasn't been set by the user)
1947 // when concurrent marking is initialized.
1948 // Its value will be based upon the number of parallel marking threads.
1949 // But we do set the maximum mark stack size here.
1950 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1951 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1952 }
1953
1954 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1955 // In G1, we want the default GC overhead goal to be higher than
1956 // it is for PS, or the heap might be expanded too aggressively.
1957 // We set it here to ~8%.
1958 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1959 }
1960
1961 // Below, we might need to calculate the pause time interval based on
1962 // the pause target. When we do so we are going to give G1 maximum
1963 // flexibility and allow it to do pauses when it needs to. So, we'll
1964 // arrange that the pause interval to be pause time target + 1 to
1965 // ensure that a) the pause time target is maximized with respect to
1966 // the pause interval and b) we maintain the invariant that pause
1967 // time target < pause interval. If the user does not want this
1968 // maximum flexibility, they will have to set the pause interval
1969 // explicitly.
1970
1971 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1972 // The default pause time target in G1 is 200ms
1973 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1974 }
1975
1976 // Then, if the interval parameter was not set, set it according to
1977 // the pause time target (this will also deal with the case when the
1978 // pause time target is the default value).
1979 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1980 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1981 }
1982
1983 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1984 }
1985
1986 void Arguments::set_gc_specific_flags() {
1987 #if INCLUDE_ALL_GCS
1988 // Set per-collector flags
1989 if (UseParallelGC || UseParallelOldGC) {
1990 set_parallel_gc_flags();
1991 } else if (UseConcMarkSweepGC) {
1992 set_cms_and_parnew_gc_flags();
1993 } else if (UseG1GC) {
1994 set_g1_gc_flags();
1995 }
1996 if (AssumeMP && !UseSerialGC) {
1997 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1998 warning("If the number of processors is expected to increase from one, then"
1999 " you should configure the number of parallel GC threads appropriately"
2000 " using -XX:ParallelGCThreads=N");
2001 }
2002 }
2003 if (MinHeapFreeRatio == 100) {
2004 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2005 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2006 }
2007
2008 // If class unloading is disabled, also disable concurrent class unloading.
2009 if (!ClassUnloading) {
2010 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2011 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2012 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2013 }
2014 #endif // INCLUDE_ALL_GCS
2015 }
2016
2017 julong Arguments::limit_by_allocatable_memory(julong limit) {
2018 julong max_allocatable;
2019 julong result = limit;
2020 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2021 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2022 }
2023 return result;
2024 }
2025
2026 // Use static initialization to get the default before parsing
2027 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2028
2029 void Arguments::set_heap_size() {
2030 const julong phys_mem =
2031 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2032 : (julong)MaxRAM;
2033
2034 // If the maximum heap size has not been set with -Xmx,
2035 // then set it as fraction of the size of physical memory,
2036 // respecting the maximum and minimum sizes of the heap.
2037 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2038 julong reasonable_max = phys_mem / MaxRAMFraction;
2039
2040 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2041 // Small physical memory, so use a minimum fraction of it for the heap
2042 reasonable_max = phys_mem / MinRAMFraction;
2043 } else {
2044 // Not-small physical memory, so require a heap at least
2045 // as large as MaxHeapSize
2046 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2047 }
2048 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2049 // Limit the heap size to ErgoHeapSizeLimit
2050 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2051 }
2052 if (UseCompressedOops) {
2053 // Limit the heap size to the maximum possible when using compressed oops
2054 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2055
2056 // HeapBaseMinAddress can be greater than default but not less than.
2057 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2058 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2059 // matches compressed oops printing flags
2060 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2061 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2062 DefaultHeapBaseMinAddress,
2063 DefaultHeapBaseMinAddress/G,
2064 HeapBaseMinAddress);
2065 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2066 }
2067 }
2068
2069 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2070 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2071 // but it should be not less than default MaxHeapSize.
2072 max_coop_heap -= HeapBaseMinAddress;
2073 }
2074 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2075 }
2076 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2077
2078 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2079 // An initial heap size was specified on the command line,
2080 // so be sure that the maximum size is consistent. Done
2081 // after call to limit_by_allocatable_memory because that
2082 // method might reduce the allocation size.
2083 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2084 }
2085
2086 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2087 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2088 }
2089
2090 // If the minimum or initial heap_size have not been set or requested to be set
2091 // ergonomically, set them accordingly.
2092 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2093 julong reasonable_minimum = (julong)(OldSize + NewSize);
2094
2095 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2096
2097 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2098
2099 if (InitialHeapSize == 0) {
2100 julong reasonable_initial = phys_mem / InitialRAMFraction;
2101
2102 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2103 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2104
2105 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2106
2107 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2108 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2109 }
2110 // If the minimum heap size has not been set (via -Xms),
2111 // synchronize with InitialHeapSize to avoid errors with the default value.
2112 if (min_heap_size() == 0) {
2113 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2114 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2115 }
2116 }
2117 }
2118
2119 // This option inspects the machine and attempts to set various
2120 // parameters to be optimal for long-running, memory allocation
2121 // intensive jobs. It is intended for machines with large
2122 // amounts of cpu and memory.
2123 jint Arguments::set_aggressive_heap_flags() {
2124 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2125 // VM, but we may not be able to represent the total physical memory
2126 // available (like having 8gb of memory on a box but using a 32bit VM).
2127 // Thus, we need to make sure we're using a julong for intermediate
2128 // calculations.
2129 julong initHeapSize;
2130 julong total_memory = os::physical_memory();
2131
2132 if (total_memory < (julong) 256 * M) {
2133 jio_fprintf(defaultStream::error_stream(),
2134 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2135 vm_exit(1);
2136 }
2137
2138 // The heap size is half of available memory, or (at most)
2139 // all of possible memory less 160mb (leaving room for the OS
2140 // when using ISM). This is the maximum; because adaptive sizing
2141 // is turned on below, the actual space used may be smaller.
2142
2143 initHeapSize = MIN2(total_memory / (julong) 2,
2144 total_memory - (julong) 160 * M);
2145
2146 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2147
2148 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2149 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2150 return JNI_EINVAL;
2151 }
2152 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2153 return JNI_EINVAL;
2154 }
2155 // Currently the minimum size and the initial heap sizes are the same.
2156 set_min_heap_size(initHeapSize);
2157 }
2158 if (FLAG_IS_DEFAULT(NewSize)) {
2159 // Make the young generation 3/8ths of the total heap.
2160 if (FLAG_SET_CMDLINE(size_t, NewSize,
2161 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2162 return JNI_EINVAL;
2163 }
2164 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2165 return JNI_EINVAL;
2166 }
2167 }
2168
2169 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2170 FLAG_SET_DEFAULT(UseLargePages, true);
2171 #endif
2172
2173 // Increase some data structure sizes for efficiency
2174 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2175 return JNI_EINVAL;
2176 }
2177 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2178 return JNI_EINVAL;
2179 }
2180 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2181 return JNI_EINVAL;
2182 }
2183
2184 // See the OldPLABSize comment below, but replace 'after promotion'
2185 // with 'after copying'. YoungPLABSize is the size of the survivor
2186 // space per-gc-thread buffers. The default is 4kw.
2187 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2188 return JNI_EINVAL;
2189 }
2190
2191 // OldPLABSize is the size of the buffers in the old gen that
2192 // UseParallelGC uses to promote live data that doesn't fit in the
2193 // survivor spaces. At any given time, there's one for each gc thread.
2194 // The default size is 1kw. These buffers are rarely used, since the
2195 // survivor spaces are usually big enough. For specjbb, however, there
2196 // are occasions when there's lots of live data in the young gen
2197 // and we end up promoting some of it. We don't have a definite
2198 // explanation for why bumping OldPLABSize helps, but the theory
2199 // is that a bigger PLAB results in retaining something like the
2200 // original allocation order after promotion, which improves mutator
2201 // locality. A minor effect may be that larger PLABs reduce the
2202 // number of PLAB allocation events during gc. The value of 8kw
2203 // was arrived at by experimenting with specjbb.
2204 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2205 return JNI_EINVAL;
2206 }
2207
2208 // Enable parallel GC and adaptive generation sizing
2209 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212 FLAG_SET_DEFAULT(ParallelGCThreads,
2213 Abstract_VM_Version::parallel_worker_threads());
2214
2215 // Encourage steady state memory management
2216 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2217 return JNI_EINVAL;
2218 }
2219
2220 // This appears to improve mutator locality
2221 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2222 return JNI_EINVAL;
2223 }
2224
2225 // Get around early Solaris scheduling bug
2226 // (affinity vs other jobs on system)
2227 // but disallow DR and offlining (5008695).
2228 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231
2232 return JNI_OK;
2233 }
2234
2235 // This must be called after ergonomics.
2236 void Arguments::set_bytecode_flags() {
2237 if (!RewriteBytecodes) {
2238 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2239 }
2240 }
2241
2242 // Aggressive optimization flags -XX:+AggressiveOpts
2243 jint Arguments::set_aggressive_opts_flags() {
2244 #ifdef COMPILER2
2245 if (AggressiveUnboxing) {
2246 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2247 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2248 } else if (!EliminateAutoBox) {
2249 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2250 AggressiveUnboxing = false;
2251 }
2252 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2253 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2254 } else if (!DoEscapeAnalysis) {
2255 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2256 AggressiveUnboxing = false;
2257 }
2258 }
2259 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2260 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2261 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2262 }
2263 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2264 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2265 }
2266
2267 // Feed the cache size setting into the JDK
2268 char buffer[1024];
2269 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2270 if (!add_property(buffer)) {
2271 return JNI_ENOMEM;
2272 }
2273 }
2274 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2275 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2276 }
2277 #endif
2278
2279 if (AggressiveOpts) {
2280 // Sample flag setting code
2281 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2282 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2283 // }
2284 }
2285
2286 return JNI_OK;
2287 }
2288
2289 //===========================================================================================================
2290 // Parsing of java.compiler property
2291
2292 void Arguments::process_java_compiler_argument(const char* arg) {
2293 // For backwards compatibility, Djava.compiler=NONE or ""
2294 // causes us to switch to -Xint mode UNLESS -Xdebug
2295 // is also specified.
2296 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2297 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2298 }
2299 }
2300
2301 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2302 _sun_java_launcher = os::strdup_check_oom(launcher);
2303 }
2304
2305 bool Arguments::created_by_java_launcher() {
2306 assert(_sun_java_launcher != NULL, "property must have value");
2307 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2308 }
2309
2310 bool Arguments::sun_java_launcher_is_altjvm() {
2311 return _sun_java_launcher_is_altjvm;
2312 }
2313
2314 //===========================================================================================================
2315 // Parsing of main arguments
2316
2317 #if INCLUDE_JVMCI
2318 // Check consistency of jvmci vm argument settings.
2319 bool Arguments::check_jvmci_args_consistency() {
2320 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2321 }
2322 #endif //INCLUDE_JVMCI
2323
2324 // Check consistency of GC selection
2325 bool Arguments::check_gc_consistency() {
2326 // Ensure that the user has not selected conflicting sets
2327 // of collectors.
2328 uint i = 0;
2329 if (UseSerialGC) i++;
2330 if (UseConcMarkSweepGC) i++;
2331 if (UseParallelGC || UseParallelOldGC) i++;
2332 if (UseG1GC) i++;
2333 if (i > 1) {
2334 jio_fprintf(defaultStream::error_stream(),
2335 "Conflicting collector combinations in option list; "
2336 "please refer to the release notes for the combinations "
2337 "allowed\n");
2338 return false;
2339 }
2340
2341 if (UseConcMarkSweepGC && !UseParNewGC) {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2344 return false;
2345 }
2346
2347 if (UseParNewGC && !UseConcMarkSweepGC) {
2348 jio_fprintf(defaultStream::error_stream(),
2349 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2350 return false;
2351 }
2352
2353 return true;
2354 }
2355
2356 // Check the consistency of vm_init_args
2357 bool Arguments::check_vm_args_consistency() {
2358 // Method for adding checks for flag consistency.
2359 // The intent is to warn the user of all possible conflicts,
2360 // before returning an error.
2361 // Note: Needs platform-dependent factoring.
2362 bool status = true;
2363
2364 if (TLABRefillWasteFraction == 0) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "TLABRefillWasteFraction should be a denominator, "
2367 "not " SIZE_FORMAT "\n",
2368 TLABRefillWasteFraction);
2369 status = false;
2370 }
2371
2372 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2373 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2374 }
2375
2376 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2377 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2378 }
2379
2380 if (GCTimeLimit == 100) {
2381 // Turn off gc-overhead-limit-exceeded checks
2382 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2383 }
2384
2385 status = status && check_gc_consistency();
2386
2387 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2388 // insists that we hold the requisite locks so that the iteration is
2389 // MT-safe. For the verification at start-up and shut-down, we don't
2390 // yet have a good way of acquiring and releasing these locks,
2391 // which are not visible at the CollectedHeap level. We want to
2392 // be able to acquire these locks and then do the iteration rather
2393 // than just disable the lock verification. This will be fixed under
2394 // bug 4788986.
2395 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2396 if (VerifyDuringStartup) {
2397 warning("Heap verification at start-up disabled "
2398 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2399 VerifyDuringStartup = false; // Disable verification at start-up
2400 }
2401
2402 if (VerifyBeforeExit) {
2403 warning("Heap verification at shutdown disabled "
2404 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2405 VerifyBeforeExit = false; // Disable verification at shutdown
2406 }
2407 }
2408
2409 if (PrintNMTStatistics) {
2410 #if INCLUDE_NMT
2411 if (MemTracker::tracking_level() == NMT_off) {
2412 #endif // INCLUDE_NMT
2413 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2414 PrintNMTStatistics = false;
2415 #if INCLUDE_NMT
2416 }
2417 #endif
2418 }
2419 #if INCLUDE_JVMCI
2420
2421 status = status && check_jvmci_args_consistency();
2422
2423 if (EnableJVMCI) {
2424 if (!ScavengeRootsInCode) {
2425 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2426 ScavengeRootsInCode = 1;
2427 }
2428 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2429 TypeProfileLevel = 0;
2430 }
2431 if (UseJVMCICompiler) {
2432 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2433 TypeProfileWidth = 8;
2434 }
2435 }
2436 }
2437 #endif
2438
2439 // Check lower bounds of the code cache
2440 // Template Interpreter code is approximately 3X larger in debug builds.
2441 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2442 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2445 os::vm_page_size()/K);
2446 status = false;
2447 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2450 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2451 status = false;
2452 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2455 min_code_cache_size/K);
2456 status = false;
2457 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2458 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2461 CODE_CACHE_SIZE_LIMIT/M);
2462 status = false;
2463 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2466 min_code_cache_size/K);
2467 status = false;
2468 }
2469
2470 #ifdef _LP64
2471 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2472 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2473 }
2474 #endif
2475
2476 #ifndef SUPPORT_RESERVED_STACK_AREA
2477 if (StackReservedPages != 0) {
2478 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2479 warning("Reserved Stack Area not supported on this platform");
2480 }
2481 #endif
2482
2483 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2484 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2485 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2486 }
2487 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2488 }
2489 if (UseCompiler && is_interpreter_only()) {
2490 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2491 warning("UseCompiler disabled due to -Xint.");
2492 }
2493 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2494 }
2495 #ifdef COMPILER2
2496 if (PostLoopMultiversioning && !RangeCheckElimination) {
2497 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2498 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2499 }
2500 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2501 }
2502 #endif
2503 return status;
2504 }
2505
2506 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2507 const char* option_type) {
2508 if (ignore) return false;
2509
2510 const char* spacer = " ";
2511 if (option_type == NULL) {
2512 option_type = ++spacer; // Set both to the empty string.
2513 }
2514
2515 if (os::obsolete_option(option)) {
2516 jio_fprintf(defaultStream::error_stream(),
2517 "Obsolete %s%soption: %s\n", option_type, spacer,
2518 option->optionString);
2519 return false;
2520 } else {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Unrecognized %s%soption: %s\n", option_type, spacer,
2523 option->optionString);
2524 return true;
2525 }
2526 }
2527
2528 static const char* user_assertion_options[] = {
2529 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2530 };
2531
2532 static const char* system_assertion_options[] = {
2533 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2534 };
2535
2536 bool Arguments::parse_uintx(const char* value,
2537 uintx* uintx_arg,
2538 uintx min_size) {
2539
2540 // Check the sign first since atojulong() parses only unsigned values.
2541 bool value_is_positive = !(*value == '-');
2542
2543 if (value_is_positive) {
2544 julong n;
2545 bool good_return = atojulong(value, &n);
2546 if (good_return) {
2547 bool above_minimum = n >= min_size;
2548 bool value_is_too_large = n > max_uintx;
2549
2550 if (above_minimum && !value_is_too_large) {
2551 *uintx_arg = n;
2552 return true;
2553 }
2554 }
2555 }
2556 return false;
2557 }
2558
2559 unsigned int addreads_count = 0;
2560 unsigned int addexports_count = 0;
2561 unsigned int addopens_count = 0;
2562 unsigned int addmods_count = 0;
2563 unsigned int patch_mod_count = 0;
2564
2565 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2566 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2567 char* property = AllocateHeap(prop_len, mtArguments);
2568 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2569 if (ret < 0 || ret >= (int)prop_len) {
2570 FreeHeap(property);
2571 return false;
2572 }
2573 bool added = add_property(property, UnwriteableProperty, internal);
2574 FreeHeap(property);
2575 return added;
2576 }
2577
2578 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2579 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2580 if (count < 1000) {
2581 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2582 char* property = AllocateHeap(prop_len, mtArguments);
2583 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2584 if (ret < 0 || ret >= (int)prop_len) {
2585 FreeHeap(property);
2586 return false;
2587 }
2588 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2589 FreeHeap(property);
2590 return added;
2591 }
2592 return false;
2593 }
2594
2595 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2596 julong* long_arg,
2597 julong min_size) {
2598 if (!atojulong(s, long_arg)) return arg_unreadable;
2599 return check_memory_size(*long_arg, min_size);
2600 }
2601
2602 // Parse JavaVMInitArgs structure
2603
2604 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2605 const JavaVMInitArgs *java_options_args,
2606 const JavaVMInitArgs *cmd_line_args) {
2607 bool patch_mod_javabase = false;
2608
2609 // Save default settings for some mode flags
2610 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2611 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2612 Arguments::_ClipInlining = ClipInlining;
2613 Arguments::_BackgroundCompilation = BackgroundCompilation;
2614 if (TieredCompilation) {
2615 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2616 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2617 }
2618
2619 // Setup flags for mixed which is the default
2620 set_mode_flags(_mixed);
2621
2622 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2623 // variable (if present).
2624 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2625 if (result != JNI_OK) {
2626 return result;
2627 }
2628
2629 // Parse args structure generated from the command line flags.
2630 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Parse args structure generated from the _JAVA_OPTIONS environment
2636 // variable (if present) (mimics classic VM)
2637 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2638 if (result != JNI_OK) {
2639 return result;
2640 }
2641
2642 // Do final processing now that all arguments have been parsed
2643 result = finalize_vm_init_args();
2644 if (result != JNI_OK) {
2645 return result;
2646 }
2647
2648 return JNI_OK;
2649 }
2650
2651 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2652 // represents a valid JDWP agent. is_path==true denotes that we
2653 // are dealing with -agentpath (case where name is a path), otherwise with
2654 // -agentlib
2655 bool valid_jdwp_agent(char *name, bool is_path) {
2656 char *_name;
2657 const char *_jdwp = "jdwp";
2658 size_t _len_jdwp, _len_prefix;
2659
2660 if (is_path) {
2661 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2662 return false;
2663 }
2664
2665 _name++; // skip past last path separator
2666 _len_prefix = strlen(JNI_LIB_PREFIX);
2667
2668 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2669 return false;
2670 }
2671
2672 _name += _len_prefix;
2673 _len_jdwp = strlen(_jdwp);
2674
2675 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2676 _name += _len_jdwp;
2677 }
2678 else {
2679 return false;
2680 }
2681
2682 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2683 return false;
2684 }
2685
2686 return true;
2687 }
2688
2689 if (strcmp(name, _jdwp) == 0) {
2690 return true;
2691 }
2692
2693 return false;
2694 }
2695
2696 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2697 // --patch-module=<module>=<file>(<pathsep><file>)*
2698 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2699 // Find the equal sign between the module name and the path specification
2700 const char* module_equal = strchr(patch_mod_tail, '=');
2701 if (module_equal == NULL) {
2702 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2703 return JNI_ERR;
2704 } else {
2705 // Pick out the module name
2706 size_t module_len = module_equal - patch_mod_tail;
2707 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2708 if (module_name != NULL) {
2709 memcpy(module_name, patch_mod_tail, module_len);
2710 *(module_name + module_len) = '\0';
2711 // The path piece begins one past the module_equal sign
2712 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2713 FREE_C_HEAP_ARRAY(char, module_name);
2714 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2715 return JNI_ENOMEM;
2716 }
2717 } else {
2718 return JNI_ENOMEM;
2719 }
2720 }
2721 return JNI_OK;
2722 }
2723
2724 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2725 // For match_option to return remaining or value part of option string
2726 const char* tail;
2727
2728 // iterate over arguments
2729 for (int index = 0; index < args->nOptions; index++) {
2730 bool is_absolute_path = false; // for -agentpath vs -agentlib
2731
2732 const JavaVMOption* option = args->options + index;
2733
2734 if (!match_option(option, "-Djava.class.path", &tail) &&
2735 !match_option(option, "-Dsun.java.command", &tail) &&
2736 !match_option(option, "-Dsun.java.launcher", &tail)) {
2737
2738 // add all jvm options to the jvm_args string. This string
2739 // is used later to set the java.vm.args PerfData string constant.
2740 // the -Djava.class.path and the -Dsun.java.command options are
2741 // omitted from jvm_args string as each have their own PerfData
2742 // string constant object.
2743 build_jvm_args(option->optionString);
2744 }
2745
2746 // -verbose:[class/gc/jni]
2747 if (match_option(option, "-verbose", &tail)) {
2748 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2749 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2750 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2751 } else if (!strcmp(tail, ":gc")) {
2752 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2753 } else if (!strcmp(tail, ":jni")) {
2754 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 }
2758 // -da / -ea / -disableassertions / -enableassertions
2759 // These accept an optional class/package name separated by a colon, e.g.,
2760 // -da:java.lang.Thread.
2761 } else if (match_option(option, user_assertion_options, &tail, true)) {
2762 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2763 if (*tail == '\0') {
2764 JavaAssertions::setUserClassDefault(enable);
2765 } else {
2766 assert(*tail == ':', "bogus match by match_option()");
2767 JavaAssertions::addOption(tail + 1, enable);
2768 }
2769 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2770 } else if (match_option(option, system_assertion_options, &tail, false)) {
2771 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2772 JavaAssertions::setSystemClassDefault(enable);
2773 // -bootclasspath:
2774 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2775 jio_fprintf(defaultStream::output_stream(),
2776 "-Xbootclasspath is no longer a supported option.\n");
2777 return JNI_EINVAL;
2778 // -bootclasspath/a:
2779 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2780 Arguments::append_sysclasspath(tail);
2781 // -bootclasspath/p:
2782 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2783 jio_fprintf(defaultStream::output_stream(),
2784 "-Xbootclasspath/p is no longer a supported option.\n");
2785 return JNI_EINVAL;
2786 // -Xrun
2787 } else if (match_option(option, "-Xrun", &tail)) {
2788 if (tail != NULL) {
2789 const char* pos = strchr(tail, ':');
2790 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2791 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2792 jio_snprintf(name, len + 1, "%s", tail);
2793
2794 char *options = NULL;
2795 if(pos != NULL) {
2796 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2797 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2798 }
2799 #if !INCLUDE_JVMTI
2800 if (strcmp(name, "jdwp") == 0) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Debugging agents are not supported in this VM\n");
2803 return JNI_ERR;
2804 }
2805 #endif // !INCLUDE_JVMTI
2806 add_init_library(name, options);
2807 }
2808 } else if (match_option(option, "--add-reads=", &tail)) {
2809 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2810 return JNI_ENOMEM;
2811 }
2812 } else if (match_option(option, "--add-exports=", &tail)) {
2813 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2814 return JNI_ENOMEM;
2815 }
2816 } else if (match_option(option, "--add-opens=", &tail)) {
2817 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2818 return JNI_ENOMEM;
2819 }
2820 } else if (match_option(option, "--add-modules=", &tail)) {
2821 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2822 return JNI_ENOMEM;
2823 }
2824 } else if (match_option(option, "--limit-modules=", &tail)) {
2825 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2826 return JNI_ENOMEM;
2827 }
2828 } else if (match_option(option, "--module-path=", &tail)) {
2829 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2830 return JNI_ENOMEM;
2831 }
2832 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2833 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2834 return JNI_ENOMEM;
2835 }
2836 } else if (match_option(option, "--patch-module=", &tail)) {
2837 // --patch-module=<module>=<file>(<pathsep><file>)*
2838 int res = process_patch_mod_option(tail, patch_mod_javabase);
2839 if (res != JNI_OK) {
2840 return res;
2841 }
2842 // -agentlib and -agentpath
2843 } else if (match_option(option, "-agentlib:", &tail) ||
2844 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2845 if(tail != NULL) {
2846 const char* pos = strchr(tail, '=');
2847 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2848 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2849 name[len] = '\0';
2850
2851 char *options = NULL;
2852 if(pos != NULL) {
2853 options = os::strdup_check_oom(pos + 1, mtArguments);
2854 }
2855 #if !INCLUDE_JVMTI
2856 if (valid_jdwp_agent(name, is_absolute_path)) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Debugging agents are not supported in this VM\n");
2859 return JNI_ERR;
2860 }
2861 #endif // !INCLUDE_JVMTI
2862 add_init_agent(name, options, is_absolute_path);
2863 }
2864 // -javaagent
2865 } else if (match_option(option, "-javaagent:", &tail)) {
2866 #if !INCLUDE_JVMTI
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Instrumentation agents are not supported in this VM\n");
2869 return JNI_ERR;
2870 #else
2871 if (tail != NULL) {
2872 size_t length = strlen(tail) + 1;
2873 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2874 jio_snprintf(options, length, "%s", tail);
2875 add_init_agent("instrument", options, false);
2876 // java agents need module java.instrument
2877 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2878 return JNI_ENOMEM;
2879 }
2880 }
2881 #endif // !INCLUDE_JVMTI
2882 // -Xnoclassgc
2883 } else if (match_option(option, "-Xnoclassgc")) {
2884 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 // -Xconcgc
2888 } else if (match_option(option, "-Xconcgc")) {
2889 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2893 // -Xnoconcgc
2894 } else if (match_option(option, "-Xnoconcgc")) {
2895 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2899 // -Xbatch
2900 } else if (match_option(option, "-Xbatch")) {
2901 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 // -Xmn for compatibility with other JVM vendors
2905 } else if (match_option(option, "-Xmn", &tail)) {
2906 julong long_initial_young_size = 0;
2907 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2908 if (errcode != arg_in_range) {
2909 jio_fprintf(defaultStream::error_stream(),
2910 "Invalid initial young generation size: %s\n", option->optionString);
2911 describe_range_error(errcode);
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 // -Xms
2921 } else if (match_option(option, "-Xms", &tail)) {
2922 julong long_initial_heap_size = 0;
2923 // an initial heap size of 0 means automatically determine
2924 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2925 if (errcode != arg_in_range) {
2926 jio_fprintf(defaultStream::error_stream(),
2927 "Invalid initial heap size: %s\n", option->optionString);
2928 describe_range_error(errcode);
2929 return JNI_EINVAL;
2930 }
2931 set_min_heap_size((size_t)long_initial_heap_size);
2932 // Currently the minimum size and the initial heap sizes are the same.
2933 // Can be overridden with -XX:InitialHeapSize.
2934 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 // -Xmx
2938 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2939 julong long_max_heap_size = 0;
2940 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2941 if (errcode != arg_in_range) {
2942 jio_fprintf(defaultStream::error_stream(),
2943 "Invalid maximum heap size: %s\n", option->optionString);
2944 describe_range_error(errcode);
2945 return JNI_EINVAL;
2946 }
2947 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 // Xmaxf
2951 } else if (match_option(option, "-Xmaxf", &tail)) {
2952 char* err;
2953 int maxf = (int)(strtod(tail, &err) * 100);
2954 if (*err != '\0' || *tail == '\0') {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "Bad max heap free percentage size: %s\n",
2957 option->optionString);
2958 return JNI_EINVAL;
2959 } else {
2960 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 }
2964 // Xminf
2965 } else if (match_option(option, "-Xminf", &tail)) {
2966 char* err;
2967 int minf = (int)(strtod(tail, &err) * 100);
2968 if (*err != '\0' || *tail == '\0') {
2969 jio_fprintf(defaultStream::error_stream(),
2970 "Bad min heap free percentage size: %s\n",
2971 option->optionString);
2972 return JNI_EINVAL;
2973 } else {
2974 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 }
2978 // -Xss
2979 } else if (match_option(option, "-Xss", &tail)) {
2980 julong long_ThreadStackSize = 0;
2981 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2982 if (errcode != arg_in_range) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid thread stack size: %s\n", option->optionString);
2985 describe_range_error(errcode);
2986 return JNI_EINVAL;
2987 }
2988 // Internally track ThreadStackSize in units of 1024 bytes.
2989 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2990 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2994 } else if (match_option(option, "-Xoss", &tail) ||
2995 match_option(option, "-Xsqnopause") ||
2996 match_option(option, "-Xoptimize") ||
2997 match_option(option, "-Xboundthreads") ||
2998 match_option(option, "-Xusealtsigs")) {
2999 // All these options are deprecated in JDK 9 and will be removed in a future release
3000 char version[256];
3001 JDK_Version::jdk(9).to_string(version, sizeof(version));
3002 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3003 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3004 julong long_CodeCacheExpansionSize = 0;
3005 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3006 if (errcode != arg_in_range) {
3007 jio_fprintf(defaultStream::error_stream(),
3008 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3009 os::vm_page_size()/K);
3010 return JNI_EINVAL;
3011 }
3012 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3016 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3017 julong long_ReservedCodeCacheSize = 0;
3018
3019 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3020 if (errcode != arg_in_range) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Invalid maximum code cache size: %s.\n", option->optionString);
3023 return JNI_EINVAL;
3024 }
3025 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3026 return JNI_EINVAL;
3027 }
3028 // -XX:NonNMethodCodeHeapSize=
3029 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3030 julong long_NonNMethodCodeHeapSize = 0;
3031
3032 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3033 if (errcode != arg_in_range) {
3034 jio_fprintf(defaultStream::error_stream(),
3035 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3036 return JNI_EINVAL;
3037 }
3038 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 // -XX:ProfiledCodeHeapSize=
3042 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3043 julong long_ProfiledCodeHeapSize = 0;
3044
3045 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3046 if (errcode != arg_in_range) {
3047 jio_fprintf(defaultStream::error_stream(),
3048 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3049 return JNI_EINVAL;
3050 }
3051 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 // -XX:NonProfiledCodeHeapSizee=
3055 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3056 julong long_NonProfiledCodeHeapSize = 0;
3057
3058 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3059 if (errcode != arg_in_range) {
3060 jio_fprintf(defaultStream::error_stream(),
3061 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3062 return JNI_EINVAL;
3063 }
3064 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3065 return JNI_EINVAL;
3066 }
3067 // -green
3068 } else if (match_option(option, "-green")) {
3069 jio_fprintf(defaultStream::error_stream(),
3070 "Green threads support not available\n");
3071 return JNI_EINVAL;
3072 // -native
3073 } else if (match_option(option, "-native")) {
3074 // HotSpot always uses native threads, ignore silently for compatibility
3075 // -Xrs
3076 } else if (match_option(option, "-Xrs")) {
3077 // Classic/EVM option, new functionality
3078 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 // -Xprof
3082 } else if (match_option(option, "-Xprof")) {
3083 #if INCLUDE_FPROF
3084 _has_profile = true;
3085 #else // INCLUDE_FPROF
3086 jio_fprintf(defaultStream::error_stream(),
3087 "Flat profiling is not supported in this VM.\n");
3088 return JNI_ERR;
3089 #endif // INCLUDE_FPROF
3090 // -Xconcurrentio
3091 } else if (match_option(option, "-Xconcurrentio")) {
3092 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3093 return JNI_EINVAL;
3094 }
3095 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3099 return JNI_EINVAL;
3100 }
3101 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3102 return JNI_EINVAL;
3103 }
3104 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3105 return JNI_EINVAL;
3106 }
3107
3108 // -Xinternalversion
3109 } else if (match_option(option, "-Xinternalversion")) {
3110 jio_fprintf(defaultStream::output_stream(), "%s\n",
3111 VM_Version::internal_vm_info_string());
3112 vm_exit(0);
3113 #ifndef PRODUCT
3114 // -Xprintflags
3115 } else if (match_option(option, "-Xprintflags")) {
3116 CommandLineFlags::printFlags(tty, false);
3117 vm_exit(0);
3118 #endif
3119 // -D
3120 } else if (match_option(option, "-D", &tail)) {
3121 const char* value;
3122 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3123 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3124 // abort if -Djava.endorsed.dirs is set
3125 jio_fprintf(defaultStream::output_stream(),
3126 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3127 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3128 return JNI_EINVAL;
3129 }
3130 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3131 *value != '\0' && strcmp(value, "\"\"") != 0) {
3132 // abort if -Djava.ext.dirs is set
3133 jio_fprintf(defaultStream::output_stream(),
3134 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3135 return JNI_EINVAL;
3136 }
3137 // Check for module related properties. They must be set using the modules
3138 // options. For example: use "--add-modules=java.sql", not
3139 // "-Djdk.module.addmods=java.sql"
3140 if (is_internal_module_property(option->optionString + 2)) {
3141 needs_module_property_warning = true;
3142 continue;
3143 }
3144
3145 if (!add_property(tail)) {
3146 return JNI_ENOMEM;
3147 }
3148 // Out of the box management support
3149 if (match_option(option, "-Dcom.sun.management", &tail)) {
3150 #if INCLUDE_MANAGEMENT
3151 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 // management agent in module java.management
3155 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3156 return JNI_ENOMEM;
3157 }
3158 #else
3159 jio_fprintf(defaultStream::output_stream(),
3160 "-Dcom.sun.management is not supported in this VM.\n");
3161 return JNI_ERR;
3162 #endif
3163 }
3164 // -Xint
3165 } else if (match_option(option, "-Xint")) {
3166 set_mode_flags(_int);
3167 // -Xmixed
3168 } else if (match_option(option, "-Xmixed")) {
3169 set_mode_flags(_mixed);
3170 // -Xcomp
3171 } else if (match_option(option, "-Xcomp")) {
3172 // for testing the compiler; turn off all flags that inhibit compilation
3173 set_mode_flags(_comp);
3174 // -Xshare:dump
3175 } else if (match_option(option, "-Xshare:dump")) {
3176 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 set_mode_flags(_int); // Prevent compilation, which creates objects
3180 // -Xshare:on
3181 } else if (match_option(option, "-Xshare:on")) {
3182 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 // -Xshare:auto
3189 } else if (match_option(option, "-Xshare:auto")) {
3190 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3191 return JNI_EINVAL;
3192 }
3193 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 // -Xshare:off
3197 } else if (match_option(option, "-Xshare:off")) {
3198 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 // -Xverify
3205 } else if (match_option(option, "-Xverify", &tail)) {
3206 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3207 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3208 return JNI_EINVAL;
3209 }
3210 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3211 return JNI_EINVAL;
3212 }
3213 } else if (strcmp(tail, ":remote") == 0) {
3214 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3215 return JNI_EINVAL;
3216 }
3217 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3218 return JNI_EINVAL;
3219 }
3220 } else if (strcmp(tail, ":none") == 0) {
3221 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3222 return JNI_EINVAL;
3223 }
3224 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3225 return JNI_EINVAL;
3226 }
3227 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3228 return JNI_EINVAL;
3229 }
3230 // -Xdebug
3231 } else if (match_option(option, "-Xdebug")) {
3232 // note this flag has been used, then ignore
3233 set_xdebug_mode(true);
3234 // -Xnoagent
3235 } else if (match_option(option, "-Xnoagent")) {
3236 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3237 } else if (match_option(option, "-Xloggc:", &tail)) {
3238 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3239 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3240 _gc_log_filename = os::strdup_check_oom(tail);
3241 } else if (match_option(option, "-Xlog", &tail)) {
3242 bool ret = false;
3243 if (strcmp(tail, ":help") == 0) {
3244 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3245 vm_exit(0);
3246 } else if (strcmp(tail, ":disable") == 0) {
3247 LogConfiguration::disable_logging();
3248 ret = true;
3249 } else if (*tail == '\0') {
3250 ret = LogConfiguration::parse_command_line_arguments();
3251 assert(ret, "-Xlog without arguments should never fail to parse");
3252 } else if (*tail == ':') {
3253 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3254 }
3255 if (ret == false) {
3256 jio_fprintf(defaultStream::error_stream(),
3257 "Invalid -Xlog option '-Xlog%s'\n",
3258 tail);
3259 return JNI_EINVAL;
3260 }
3261 // JNI hooks
3262 } else if (match_option(option, "-Xcheck", &tail)) {
3263 if (!strcmp(tail, ":jni")) {
3264 #if !INCLUDE_JNI_CHECK
3265 warning("JNI CHECKING is not supported in this VM");
3266 #else
3267 CheckJNICalls = true;
3268 #endif // INCLUDE_JNI_CHECK
3269 } else if (is_bad_option(option, args->ignoreUnrecognized,
3270 "check")) {
3271 return JNI_EINVAL;
3272 }
3273 } else if (match_option(option, "vfprintf")) {
3274 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3275 } else if (match_option(option, "exit")) {
3276 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3277 } else if (match_option(option, "abort")) {
3278 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3279 // -XX:+AggressiveHeap
3280 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3281 jint result = set_aggressive_heap_flags();
3282 if (result != JNI_OK) {
3283 return result;
3284 }
3285 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3286 // and the last option wins.
3287 } else if (match_option(option, "-XX:+NeverTenure")) {
3288 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3289 return JNI_EINVAL;
3290 }
3291 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3292 return JNI_EINVAL;
3293 }
3294 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3298 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3305 return JNI_EINVAL;
3306 }
3307 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3308 uintx max_tenuring_thresh = 0;
3309 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3310 jio_fprintf(defaultStream::error_stream(),
3311 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3312 return JNI_EINVAL;
3313 }
3314
3315 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3316 return JNI_EINVAL;
3317 }
3318
3319 if (MaxTenuringThreshold == 0) {
3320 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3321 return JNI_EINVAL;
3322 }
3323 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3324 return JNI_EINVAL;
3325 }
3326 } else {
3327 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3328 return JNI_EINVAL;
3329 }
3330 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3331 return JNI_EINVAL;
3332 }
3333 }
3334 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3335 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3336 return JNI_EINVAL;
3337 }
3338 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3342 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3343 return JNI_EINVAL;
3344 }
3345 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3346 return JNI_EINVAL;
3347 }
3348 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3349 #if defined(DTRACE_ENABLED)
3350 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3351 return JNI_EINVAL;
3352 }
3353 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3354 return JNI_EINVAL;
3355 }
3356 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3357 return JNI_EINVAL;
3358 }
3359 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3360 return JNI_EINVAL;
3361 }
3362 #else // defined(DTRACE_ENABLED)
3363 jio_fprintf(defaultStream::error_stream(),
3364 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3365 return JNI_EINVAL;
3366 #endif // defined(DTRACE_ENABLED)
3367 #ifdef ASSERT
3368 } else if (match_option(option, "-XX:+FullGCALot")) {
3369 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3370 return JNI_EINVAL;
3371 }
3372 // disable scavenge before parallel mark-compact
3373 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3374 return JNI_EINVAL;
3375 }
3376 #endif
3377 #if !INCLUDE_MANAGEMENT
3378 } else if (match_option(option, "-XX:+ManagementServer")) {
3379 jio_fprintf(defaultStream::error_stream(),
3380 "ManagementServer is not supported in this VM.\n");
3381 return JNI_ERR;
3382 #endif // INCLUDE_MANAGEMENT
3383 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3384 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3385 // already been handled
3386 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3387 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3388 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3389 return JNI_EINVAL;
3390 }
3391 }
3392 // Unknown option
3393 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3394 return JNI_ERR;
3395 }
3396 }
3397
3398 // PrintSharedArchiveAndExit will turn on
3399 // -Xshare:on
3400 // -Xlog:class+path=info
3401 if (PrintSharedArchiveAndExit) {
3402 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3403 return JNI_EINVAL;
3404 }
3405 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3406 return JNI_EINVAL;
3407 }
3408 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3409 }
3410
3411 // Change the default value for flags which have different default values
3412 // when working with older JDKs.
3413 #ifdef LINUX
3414 if (JDK_Version::current().compare_major(6) <= 0 &&
3415 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3416 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3417 }
3418 #endif // LINUX
3419 fix_appclasspath();
3420 return JNI_OK;
3421 }
3422
3423 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3424 // For java.base check for duplicate --patch-module options being specified on the command line.
3425 // This check is only required for java.base, all other duplicate module specifications
3426 // will be checked during module system initialization. The module system initialization
3427 // will throw an ExceptionInInitializerError if this situation occurs.
3428 if (strcmp(module_name, "java.base") == 0) {
3429 if (*patch_mod_javabase) {
3430 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3431 } else {
3432 *patch_mod_javabase = true;
3433 }
3434 }
3435
3436 // Create GrowableArray lazily, only if --patch-module has been specified
3437 if (_patch_mod_prefix == NULL) {
3438 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3439 }
3440
3441 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3442 }
3443
3444 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3445 //
3446 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3447 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3448 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3449 // path is treated as the current directory.
3450 //
3451 // This causes problems with CDS, which requires that all directories specified in the classpath
3452 // must be empty. In most cases, applications do NOT want to load classes from the current
3453 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3454 // scripts compatible with CDS.
3455 void Arguments::fix_appclasspath() {
3456 if (IgnoreEmptyClassPaths) {
3457 const char separator = *os::path_separator();
3458 const char* src = _java_class_path->value();
3459
3460 // skip over all the leading empty paths
3461 while (*src == separator) {
3462 src ++;
3463 }
3464
3465 char* copy = os::strdup_check_oom(src, mtArguments);
3466
3467 // trim all trailing empty paths
3468 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3469 *tail = '\0';
3470 }
3471
3472 char from[3] = {separator, separator, '\0'};
3473 char to [2] = {separator, '\0'};
3474 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3475 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3476 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3477 }
3478
3479 _java_class_path->set_writeable_value(copy);
3480 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3481 }
3482 }
3483
3484 static bool has_jar_files(const char* directory) {
3485 DIR* dir = os::opendir(directory);
3486 if (dir == NULL) return false;
3487
3488 struct dirent *entry;
3489 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3490 bool hasJarFile = false;
3491 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3492 const char* name = entry->d_name;
3493 const char* ext = name + strlen(name) - 4;
3494 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3495 }
3496 FREE_C_HEAP_ARRAY(char, dbuf);
3497 os::closedir(dir);
3498 return hasJarFile ;
3499 }
3500
3501 static int check_non_empty_dirs(const char* path) {
3502 const char separator = *os::path_separator();
3503 const char* const end = path + strlen(path);
3504 int nonEmptyDirs = 0;
3505 while (path < end) {
3506 const char* tmp_end = strchr(path, separator);
3507 if (tmp_end == NULL) {
3508 if (has_jar_files(path)) {
3509 nonEmptyDirs++;
3510 jio_fprintf(defaultStream::output_stream(),
3511 "Non-empty directory: %s\n", path);
3512 }
3513 path = end;
3514 } else {
3515 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3516 memcpy(dirpath, path, tmp_end - path);
3517 dirpath[tmp_end - path] = '\0';
3518 if (has_jar_files(dirpath)) {
3519 nonEmptyDirs++;
3520 jio_fprintf(defaultStream::output_stream(),
3521 "Non-empty directory: %s\n", dirpath);
3522 }
3523 FREE_C_HEAP_ARRAY(char, dirpath);
3524 path = tmp_end + 1;
3525 }
3526 }
3527 return nonEmptyDirs;
3528 }
3529
3530 jint Arguments::finalize_vm_init_args() {
3531 // check if the default lib/endorsed directory exists; if so, error
3532 char path[JVM_MAXPATHLEN];
3533 const char* fileSep = os::file_separator();
3534 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3535
3536 if (CheckEndorsedAndExtDirs) {
3537 int nonEmptyDirs = 0;
3538 // check endorsed directory
3539 nonEmptyDirs += check_non_empty_dirs(path);
3540 // check the extension directories
3541 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3542 if (nonEmptyDirs > 0) {
3543 return JNI_ERR;
3544 }
3545 }
3546
3547 DIR* dir = os::opendir(path);
3548 if (dir != NULL) {
3549 jio_fprintf(defaultStream::output_stream(),
3550 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3551 "in modular form will be supported via the concept of upgradeable modules.\n");
3552 os::closedir(dir);
3553 return JNI_ERR;
3554 }
3555
3556 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3557 dir = os::opendir(path);
3558 if (dir != NULL) {
3559 jio_fprintf(defaultStream::output_stream(),
3560 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3561 "Use -classpath instead.\n.");
3562 os::closedir(dir);
3563 return JNI_ERR;
3564 }
3565
3566 // This must be done after all arguments have been processed.
3567 // java_compiler() true means set to "NONE" or empty.
3568 if (java_compiler() && !xdebug_mode()) {
3569 // For backwards compatibility, we switch to interpreted mode if
3570 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3571 // not specified.
3572 set_mode_flags(_int);
3573 }
3574
3575 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3576 // but like -Xint, leave compilation thresholds unaffected.
3577 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3578 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3579 set_mode_flags(_int);
3580 }
3581
3582 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3583 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3584 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3585 }
3586
3587 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3588 // Don't degrade server performance for footprint
3589 if (FLAG_IS_DEFAULT(UseLargePages) &&
3590 MaxHeapSize < LargePageHeapSizeThreshold) {
3591 // No need for large granularity pages w/small heaps.
3592 // Note that large pages are enabled/disabled for both the
3593 // Java heap and the code cache.
3594 FLAG_SET_DEFAULT(UseLargePages, false);
3595 }
3596
3597 #elif defined(COMPILER2)
3598 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3599 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3600 }
3601 #endif
3602
3603 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3604 UNSUPPORTED_OPTION(ProfileInterpreter);
3605 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3606 #endif
3607
3608 #ifndef TIERED
3609 // Tiered compilation is undefined.
3610 UNSUPPORTED_OPTION(TieredCompilation);
3611 #endif
3612
3613 #if INCLUDE_JVMCI
3614 if (EnableJVMCI &&
3615 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3616 return JNI_ENOMEM;
3617 }
3618 #endif
3619
3620 // If we are running in a headless jre, force java.awt.headless property
3621 // to be true unless the property has already been set.
3622 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3623 if (os::is_headless_jre()) {
3624 const char* headless = Arguments::get_property("java.awt.headless");
3625 if (headless == NULL) {
3626 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3627 if (headless_env == NULL) {
3628 if (!add_property("java.awt.headless=true")) {
3629 return JNI_ENOMEM;
3630 }
3631 } else {
3632 char buffer[256];
3633 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3634 if (!add_property(buffer)) {
3635 return JNI_ENOMEM;
3636 }
3637 }
3638 }
3639 }
3640
3641 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3642 // CMS can only be used with ParNew
3643 FLAG_SET_ERGO(bool, UseParNewGC, true);
3644 }
3645
3646 if (!check_vm_args_consistency()) {
3647 return JNI_ERR;
3648 }
3649
3650 if (!FLAG_IS_DEFAULT(HeapDir)) {
3651 if (!FLAG_IS_DEFAULT(UseNUMAInterleaving) || !FLAG_IS_DEFAULT(UseNUMA)) {
3652 log_warning(arguments) ("NUMA support depends on the file system when HeapDir option is used.\n");
3653 }
3654 FLAG_SET_CMDLINE(bool, UseNUMAInterleaving, false);
3655 FLAG_SET_CMDLINE(bool, UseNUMA, false);
3656 }
3657
3658 return JNI_OK;
3659 }
3660
3661 // Helper class for controlling the lifetime of JavaVMInitArgs
3662 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3663 // deleted on the destruction of the ScopedVMInitArgs object.
3664 class ScopedVMInitArgs : public StackObj {
3665 private:
3666 JavaVMInitArgs _args;
3667 char* _container_name;
3668 bool _is_set;
3669 char* _vm_options_file_arg;
3670
3671 public:
3672 ScopedVMInitArgs(const char *container_name) {
3673 _args.version = JNI_VERSION_1_2;
3674 _args.nOptions = 0;
3675 _args.options = NULL;
3676 _args.ignoreUnrecognized = false;
3677 _container_name = (char *)container_name;
3678 _is_set = false;
3679 _vm_options_file_arg = NULL;
3680 }
3681
3682 // Populates the JavaVMInitArgs object represented by this
3683 // ScopedVMInitArgs object with the arguments in options. The
3684 // allocated memory is deleted by the destructor. If this method
3685 // returns anything other than JNI_OK, then this object is in a
3686 // partially constructed state, and should be abandoned.
3687 jint set_args(GrowableArray<JavaVMOption>* options) {
3688 _is_set = true;
3689 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3690 JavaVMOption, options->length(), mtArguments);
3691 if (options_arr == NULL) {
3692 return JNI_ENOMEM;
3693 }
3694 _args.options = options_arr;
3695
3696 for (int i = 0; i < options->length(); i++) {
3697 options_arr[i] = options->at(i);
3698 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3699 if (options_arr[i].optionString == NULL) {
3700 // Rely on the destructor to do cleanup.
3701 _args.nOptions = i;
3702 return JNI_ENOMEM;
3703 }
3704 }
3705
3706 _args.nOptions = options->length();
3707 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3708 return JNI_OK;
3709 }
3710
3711 JavaVMInitArgs* get() { return &_args; }
3712 char* container_name() { return _container_name; }
3713 bool is_set() { return _is_set; }
3714 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3715 char* vm_options_file_arg() { return _vm_options_file_arg; }
3716
3717 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3718 if (_vm_options_file_arg != NULL) {
3719 os::free(_vm_options_file_arg);
3720 }
3721 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3722 }
3723
3724 ~ScopedVMInitArgs() {
3725 if (_vm_options_file_arg != NULL) {
3726 os::free(_vm_options_file_arg);
3727 }
3728 if (_args.options == NULL) return;
3729 for (int i = 0; i < _args.nOptions; i++) {
3730 os::free(_args.options[i].optionString);
3731 }
3732 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3733 }
3734
3735 // Insert options into this option list, to replace option at
3736 // vm_options_file_pos (-XX:VMOptionsFile)
3737 jint insert(const JavaVMInitArgs* args,
3738 const JavaVMInitArgs* args_to_insert,
3739 const int vm_options_file_pos) {
3740 assert(_args.options == NULL, "shouldn't be set yet");
3741 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3742 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3743
3744 int length = args->nOptions + args_to_insert->nOptions - 1;
3745 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3746 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3747 for (int i = 0; i < args->nOptions; i++) {
3748 if (i == vm_options_file_pos) {
3749 // insert the new options starting at the same place as the
3750 // -XX:VMOptionsFile option
3751 for (int j = 0; j < args_to_insert->nOptions; j++) {
3752 options->push(args_to_insert->options[j]);
3753 }
3754 } else {
3755 options->push(args->options[i]);
3756 }
3757 }
3758 // make into options array
3759 jint result = set_args(options);
3760 delete options;
3761 return result;
3762 }
3763 };
3764
3765 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3766 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3767 }
3768
3769 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3770 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3771 }
3772
3773 jint Arguments::parse_options_environment_variable(const char* name,
3774 ScopedVMInitArgs* vm_args) {
3775 char *buffer = ::getenv(name);
3776
3777 // Don't check this environment variable if user has special privileges
3778 // (e.g. unix su command).
3779 if (buffer == NULL || os::have_special_privileges()) {
3780 return JNI_OK;
3781 }
3782
3783 if ((buffer = os::strdup(buffer)) == NULL) {
3784 return JNI_ENOMEM;
3785 }
3786
3787 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3788
3789 os::free(buffer);
3790 return retcode;
3791 }
3792
3793 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3794 // read file into buffer
3795 int fd = ::open(file_name, O_RDONLY);
3796 if (fd < 0) {
3797 jio_fprintf(defaultStream::error_stream(),
3798 "Could not open options file '%s'\n",
3799 file_name);
3800 return JNI_ERR;
3801 }
3802
3803 struct stat stbuf;
3804 int retcode = os::stat(file_name, &stbuf);
3805 if (retcode != 0) {
3806 jio_fprintf(defaultStream::error_stream(),
3807 "Could not stat options file '%s'\n",
3808 file_name);
3809 os::close(fd);
3810 return JNI_ERR;
3811 }
3812
3813 if (stbuf.st_size == 0) {
3814 // tell caller there is no option data and that is ok
3815 os::close(fd);
3816 return JNI_OK;
3817 }
3818
3819 // '+ 1' for NULL termination even with max bytes
3820 size_t bytes_alloc = stbuf.st_size + 1;
3821
3822 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3823 if (NULL == buf) {
3824 jio_fprintf(defaultStream::error_stream(),
3825 "Could not allocate read buffer for options file parse\n");
3826 os::close(fd);
3827 return JNI_ENOMEM;
3828 }
3829
3830 memset(buf, 0, bytes_alloc);
3831
3832 // Fill buffer
3833 // Use ::read() instead of os::read because os::read()
3834 // might do a thread state transition
3835 // and it is too early for that here
3836
3837 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3838 os::close(fd);
3839 if (bytes_read < 0) {
3840 FREE_C_HEAP_ARRAY(char, buf);
3841 jio_fprintf(defaultStream::error_stream(),
3842 "Could not read options file '%s'\n", file_name);
3843 return JNI_ERR;
3844 }
3845
3846 if (bytes_read == 0) {
3847 // tell caller there is no option data and that is ok
3848 FREE_C_HEAP_ARRAY(char, buf);
3849 return JNI_OK;
3850 }
3851
3852 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3853
3854 FREE_C_HEAP_ARRAY(char, buf);
3855 return retcode;
3856 }
3857
3858 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3859 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3860
3861 // some pointers to help with parsing
3862 char *buffer_end = buffer + buf_len;
3863 char *opt_hd = buffer;
3864 char *wrt = buffer;
3865 char *rd = buffer;
3866
3867 // parse all options
3868 while (rd < buffer_end) {
3869 // skip leading white space from the input string
3870 while (rd < buffer_end && isspace(*rd)) {
3871 rd++;
3872 }
3873
3874 if (rd >= buffer_end) {
3875 break;
3876 }
3877
3878 // Remember this is where we found the head of the token.
3879 opt_hd = wrt;
3880
3881 // Tokens are strings of non white space characters separated
3882 // by one or more white spaces.
3883 while (rd < buffer_end && !isspace(*rd)) {
3884 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3885 int quote = *rd; // matching quote to look for
3886 rd++; // don't copy open quote
3887 while (rd < buffer_end && *rd != quote) {
3888 // include everything (even spaces)
3889 // up until the close quote
3890 *wrt++ = *rd++; // copy to option string
3891 }
3892
3893 if (rd < buffer_end) {
3894 rd++; // don't copy close quote
3895 } else {
3896 // did not see closing quote
3897 jio_fprintf(defaultStream::error_stream(),
3898 "Unmatched quote in %s\n", name);
3899 delete options;
3900 return JNI_ERR;
3901 }
3902 } else {
3903 *wrt++ = *rd++; // copy to option string
3904 }
3905 }
3906
3907 // steal a white space character and set it to NULL
3908 *wrt++ = '\0';
3909 // We now have a complete token
3910
3911 JavaVMOption option;
3912 option.optionString = opt_hd;
3913 option.extraInfo = NULL;
3914
3915 options->append(option); // Fill in option
3916
3917 rd++; // Advance to next character
3918 }
3919
3920 // Fill out JavaVMInitArgs structure.
3921 jint status = vm_args->set_args(options);
3922
3923 delete options;
3924 return status;
3925 }
3926
3927 void Arguments::set_shared_spaces_flags() {
3928 if (DumpSharedSpaces) {
3929 if (FailOverToOldVerifier) {
3930 // Don't fall back to the old verifier on verification failure. If a
3931 // class fails verification with the split verifier, it might fail the
3932 // CDS runtime verifier constraint check. In that case, we don't want
3933 // to share the class. We only archive classes that pass the split verifier.
3934 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3935 }
3936
3937 if (RequireSharedSpaces) {
3938 warning("Cannot dump shared archive while using shared archive");
3939 }
3940 UseSharedSpaces = false;
3941 #ifdef _LP64
3942 if (!UseCompressedOops || !UseCompressedClassPointers) {
3943 vm_exit_during_initialization(
3944 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3945 }
3946 } else {
3947 if (!UseCompressedOops || !UseCompressedClassPointers) {
3948 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3949 }
3950 #endif
3951 }
3952 }
3953
3954 // Sharing support
3955 // Construct the path to the archive
3956 static char* get_shared_archive_path() {
3957 char *shared_archive_path;
3958 if (SharedArchiveFile == NULL) {
3959 char jvm_path[JVM_MAXPATHLEN];
3960 os::jvm_path(jvm_path, sizeof(jvm_path));
3961 char *end = strrchr(jvm_path, *os::file_separator());
3962 if (end != NULL) *end = '\0';
3963 size_t jvm_path_len = strlen(jvm_path);
3964 size_t file_sep_len = strlen(os::file_separator());
3965 const size_t len = jvm_path_len + file_sep_len + 20;
3966 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3967 if (shared_archive_path != NULL) {
3968 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3969 jvm_path, os::file_separator());
3970 }
3971 } else {
3972 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3973 }
3974 return shared_archive_path;
3975 }
3976
3977 #ifndef PRODUCT
3978 // Determine whether LogVMOutput should be implicitly turned on.
3979 static bool use_vm_log() {
3980 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3981 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3982 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3983 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3984 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3985 return true;
3986 }
3987
3988 #ifdef COMPILER1
3989 if (PrintC1Statistics) {
3990 return true;
3991 }
3992 #endif // COMPILER1
3993
3994 #ifdef COMPILER2
3995 if (PrintOptoAssembly || PrintOptoStatistics) {
3996 return true;
3997 }
3998 #endif // COMPILER2
3999
4000 return false;
4001 }
4002
4003 #endif // PRODUCT
4004
4005 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4006 for (int index = 0; index < args->nOptions; index++) {
4007 const JavaVMOption* option = args->options + index;
4008 const char* tail;
4009 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4010 return true;
4011 }
4012 }
4013 return false;
4014 }
4015
4016 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4017 const char* vm_options_file,
4018 const int vm_options_file_pos,
4019 ScopedVMInitArgs* vm_options_file_args,
4020 ScopedVMInitArgs* args_out) {
4021 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4022 if (code != JNI_OK) {
4023 return code;
4024 }
4025
4026 if (vm_options_file_args->get()->nOptions < 1) {
4027 return JNI_OK;
4028 }
4029
4030 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4031 jio_fprintf(defaultStream::error_stream(),
4032 "A VM options file may not refer to a VM options file. "
4033 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4034 "options file '%s' in options container '%s' is an error.\n",
4035 vm_options_file_args->vm_options_file_arg(),
4036 vm_options_file_args->container_name());
4037 return JNI_EINVAL;
4038 }
4039
4040 return args_out->insert(args, vm_options_file_args->get(),
4041 vm_options_file_pos);
4042 }
4043
4044 // Expand -XX:VMOptionsFile found in args_in as needed.
4045 // mod_args and args_out parameters may return values as needed.
4046 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4047 ScopedVMInitArgs* mod_args,
4048 JavaVMInitArgs** args_out) {
4049 jint code = match_special_option_and_act(args_in, mod_args);
4050 if (code != JNI_OK) {
4051 return code;
4052 }
4053
4054 if (mod_args->is_set()) {
4055 // args_in contains -XX:VMOptionsFile and mod_args contains the
4056 // original options from args_in along with the options expanded
4057 // from the VMOptionsFile. Return a short-hand to the caller.
4058 *args_out = mod_args->get();
4059 } else {
4060 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4061 }
4062 return JNI_OK;
4063 }
4064
4065 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4066 ScopedVMInitArgs* args_out) {
4067 // Remaining part of option string
4068 const char* tail;
4069 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4070
4071 for (int index = 0; index < args->nOptions; index++) {
4072 const JavaVMOption* option = args->options + index;
4073 if (ArgumentsExt::process_options(option)) {
4074 continue;
4075 }
4076 if (match_option(option, "-XX:Flags=", &tail)) {
4077 Arguments::set_jvm_flags_file(tail);
4078 continue;
4079 }
4080 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4081 if (vm_options_file_args.found_vm_options_file_arg()) {
4082 jio_fprintf(defaultStream::error_stream(),
4083 "The option '%s' is already specified in the options "
4084 "container '%s' so the specification of '%s' in the "
4085 "same options container is an error.\n",
4086 vm_options_file_args.vm_options_file_arg(),
4087 vm_options_file_args.container_name(),
4088 option->optionString);
4089 return JNI_EINVAL;
4090 }
4091 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4092 // If there's a VMOptionsFile, parse that
4093 jint code = insert_vm_options_file(args, tail, index,
4094 &vm_options_file_args, args_out);
4095 if (code != JNI_OK) {
4096 return code;
4097 }
4098 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4099 if (args_out->is_set()) {
4100 // The VMOptions file inserted some options so switch 'args'
4101 // to the new set of options, and continue processing which
4102 // preserves "last option wins" semantics.
4103 args = args_out->get();
4104 // The first option from the VMOptionsFile replaces the
4105 // current option. So we back track to process the
4106 // replacement option.
4107 index--;
4108 }
4109 continue;
4110 }
4111 if (match_option(option, "-XX:+PrintVMOptions")) {
4112 PrintVMOptions = true;
4113 continue;
4114 }
4115 if (match_option(option, "-XX:-PrintVMOptions")) {
4116 PrintVMOptions = false;
4117 continue;
4118 }
4119 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4120 IgnoreUnrecognizedVMOptions = true;
4121 continue;
4122 }
4123 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4124 IgnoreUnrecognizedVMOptions = false;
4125 continue;
4126 }
4127 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4128 CommandLineFlags::printFlags(tty, false);
4129 vm_exit(0);
4130 }
4131 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4132 #if INCLUDE_NMT
4133 // The launcher did not setup nmt environment variable properly.
4134 if (!MemTracker::check_launcher_nmt_support(tail)) {
4135 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4136 }
4137
4138 // Verify if nmt option is valid.
4139 if (MemTracker::verify_nmt_option()) {
4140 // Late initialization, still in single-threaded mode.
4141 if (MemTracker::tracking_level() >= NMT_summary) {
4142 MemTracker::init();
4143 }
4144 } else {
4145 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4146 }
4147 continue;
4148 #else
4149 jio_fprintf(defaultStream::error_stream(),
4150 "Native Memory Tracking is not supported in this VM\n");
4151 return JNI_ERR;
4152 #endif
4153 }
4154
4155 #ifndef PRODUCT
4156 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4157 CommandLineFlags::printFlags(tty, true);
4158 vm_exit(0);
4159 }
4160 #endif
4161 }
4162 return JNI_OK;
4163 }
4164
4165 static void print_options(const JavaVMInitArgs *args) {
4166 const char* tail;
4167 for (int index = 0; index < args->nOptions; index++) {
4168 const JavaVMOption *option = args->options + index;
4169 if (match_option(option, "-XX:", &tail)) {
4170 logOption(tail);
4171 }
4172 }
4173 }
4174
4175 bool Arguments::handle_deprecated_print_gc_flags() {
4176 if (PrintGC) {
4177 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4178 }
4179 if (PrintGCDetails) {
4180 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4181 }
4182
4183 if (_gc_log_filename != NULL) {
4184 // -Xloggc was used to specify a filename
4185 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4186
4187 LogTarget(Error, logging) target;
4188 LogStreamCHeap errstream(target);
4189 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4190 } else if (PrintGC || PrintGCDetails) {
4191 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4192 }
4193 return true;
4194 }
4195
4196 void Arguments::handle_extra_cms_flags(const char* msg) {
4197 SpecialFlag flag;
4198 const char *flag_name = "UseConcMarkSweepGC";
4199 if (lookup_special_flag(flag_name, flag)) {
4200 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4201 warning("%s", msg);
4202 }
4203 }
4204
4205 // Parse entry point called from JNI_CreateJavaVM
4206
4207 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4208 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4209
4210 // Initialize ranges, constraints and writeables
4211 CommandLineFlagRangeList::init();
4212 CommandLineFlagConstraintList::init();
4213 CommandLineFlagWriteableList::init();
4214
4215 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4216 const char* hotspotrc = ".hotspotrc";
4217 bool settings_file_specified = false;
4218 bool needs_hotspotrc_warning = false;
4219 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4220 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4221
4222 // Pointers to current working set of containers
4223 JavaVMInitArgs* cur_cmd_args;
4224 JavaVMInitArgs* cur_java_options_args;
4225 JavaVMInitArgs* cur_java_tool_options_args;
4226
4227 // Containers for modified/expanded options
4228 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4229 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4230 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4231
4232
4233 jint code =
4234 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4235 if (code != JNI_OK) {
4236 return code;
4237 }
4238
4239 code = parse_java_options_environment_variable(&initial_java_options_args);
4240 if (code != JNI_OK) {
4241 return code;
4242 }
4243
4244 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4245 &mod_java_tool_options_args,
4246 &cur_java_tool_options_args);
4247 if (code != JNI_OK) {
4248 return code;
4249 }
4250
4251 code = expand_vm_options_as_needed(initial_cmd_args,
4252 &mod_cmd_args,
4253 &cur_cmd_args);
4254 if (code != JNI_OK) {
4255 return code;
4256 }
4257
4258 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4259 &mod_java_options_args,
4260 &cur_java_options_args);
4261 if (code != JNI_OK) {
4262 return code;
4263 }
4264
4265 const char* flags_file = Arguments::get_jvm_flags_file();
4266 settings_file_specified = (flags_file != NULL);
4267
4268 if (IgnoreUnrecognizedVMOptions) {
4269 cur_cmd_args->ignoreUnrecognized = true;
4270 cur_java_tool_options_args->ignoreUnrecognized = true;
4271 cur_java_options_args->ignoreUnrecognized = true;
4272 }
4273
4274 // Parse specified settings file
4275 if (settings_file_specified) {
4276 if (!process_settings_file(flags_file, true,
4277 cur_cmd_args->ignoreUnrecognized)) {
4278 return JNI_EINVAL;
4279 }
4280 } else {
4281 #ifdef ASSERT
4282 // Parse default .hotspotrc settings file
4283 if (!process_settings_file(".hotspotrc", false,
4284 cur_cmd_args->ignoreUnrecognized)) {
4285 return JNI_EINVAL;
4286 }
4287 #else
4288 struct stat buf;
4289 if (os::stat(hotspotrc, &buf) == 0) {
4290 needs_hotspotrc_warning = true;
4291 }
4292 #endif
4293 }
4294
4295 if (PrintVMOptions) {
4296 print_options(cur_java_tool_options_args);
4297 print_options(cur_cmd_args);
4298 print_options(cur_java_options_args);
4299 }
4300
4301 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4302 jint result = parse_vm_init_args(cur_java_tool_options_args,
4303 cur_java_options_args,
4304 cur_cmd_args);
4305
4306 if (result != JNI_OK) {
4307 return result;
4308 }
4309
4310 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4311 SharedArchivePath = get_shared_archive_path();
4312 if (SharedArchivePath == NULL) {
4313 return JNI_ENOMEM;
4314 }
4315
4316 // Set up VerifySharedSpaces
4317 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4318 VerifySharedSpaces = true;
4319 }
4320
4321 // Delay warning until here so that we've had a chance to process
4322 // the -XX:-PrintWarnings flag
4323 if (needs_hotspotrc_warning) {
4324 warning("%s file is present but has been ignored. "
4325 "Run with -XX:Flags=%s to load the file.",
4326 hotspotrc, hotspotrc);
4327 }
4328
4329 if (needs_module_property_warning) {
4330 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4331 " names that are reserved for internal use.");
4332 }
4333
4334 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4335 UNSUPPORTED_OPTION(UseLargePages);
4336 #endif
4337
4338 ArgumentsExt::report_unsupported_options();
4339
4340 #ifndef PRODUCT
4341 if (TraceBytecodesAt != 0) {
4342 TraceBytecodes = true;
4343 }
4344 if (CountCompiledCalls) {
4345 if (UseCounterDecay) {
4346 warning("UseCounterDecay disabled because CountCalls is set");
4347 UseCounterDecay = false;
4348 }
4349 }
4350 #endif // PRODUCT
4351
4352 if (ScavengeRootsInCode == 0) {
4353 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4354 warning("Forcing ScavengeRootsInCode non-zero");
4355 }
4356 ScavengeRootsInCode = 1;
4357 }
4358
4359 if (!handle_deprecated_print_gc_flags()) {
4360 return JNI_EINVAL;
4361 }
4362
4363 // Set object alignment values.
4364 set_object_alignment();
4365
4366 #if !INCLUDE_CDS
4367 if (DumpSharedSpaces || RequireSharedSpaces) {
4368 jio_fprintf(defaultStream::error_stream(),
4369 "Shared spaces are not supported in this VM\n");
4370 return JNI_ERR;
4371 }
4372 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4373 warning("Shared spaces are not supported in this VM");
4374 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4375 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4376 }
4377 no_shared_spaces("CDS Disabled");
4378 #endif // INCLUDE_CDS
4379
4380 return JNI_OK;
4381 }
4382
4383 jint Arguments::apply_ergo() {
4384
4385 // Set flags based on ergonomics.
4386 set_ergonomics_flags();
4387
4388 set_shared_spaces_flags();
4389
4390 // Check the GC selections again.
4391 if (!check_gc_consistency()) {
4392 return JNI_EINVAL;
4393 }
4394
4395 if (TieredCompilation) {
4396 set_tiered_flags();
4397 } else {
4398 int max_compilation_policy_choice = 1;
4399 #ifdef COMPILER2
4400 max_compilation_policy_choice = 2;
4401 #endif
4402 // Check if the policy is valid.
4403 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4404 vm_exit_during_initialization(
4405 "Incompatible compilation policy selected", NULL);
4406 }
4407 // Scale CompileThreshold
4408 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4409 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4410 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4411 }
4412 }
4413
4414 #ifdef COMPILER2
4415 #ifndef PRODUCT
4416 if (PrintIdealGraphLevel > 0) {
4417 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4418 }
4419 #endif
4420 #endif
4421
4422 // Set heap size based on available physical memory
4423 set_heap_size();
4424
4425 ArgumentsExt::set_gc_specific_flags();
4426
4427 // Initialize Metaspace flags and alignments
4428 Metaspace::ergo_initialize();
4429
4430 // Set bytecode rewriting flags
4431 set_bytecode_flags();
4432
4433 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4434 jint code = set_aggressive_opts_flags();
4435 if (code != JNI_OK) {
4436 return code;
4437 }
4438
4439 // Turn off biased locking for locking debug mode flags,
4440 // which are subtly different from each other but neither works with
4441 // biased locking
4442 if (UseHeavyMonitors
4443 #ifdef COMPILER1
4444 || !UseFastLocking
4445 #endif // COMPILER1
4446 #if INCLUDE_JVMCI
4447 || !JVMCIUseFastLocking
4448 #endif
4449 ) {
4450 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4451 // flag set to true on command line; warn the user that they
4452 // can't enable biased locking here
4453 warning("Biased Locking is not supported with locking debug flags"
4454 "; ignoring UseBiasedLocking flag." );
4455 }
4456 UseBiasedLocking = false;
4457 }
4458
4459 #ifdef CC_INTERP
4460 // Clear flags not supported on zero.
4461 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4462 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4463 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4464 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4465 #endif // CC_INTERP
4466
4467 #ifdef COMPILER2
4468 if (!EliminateLocks) {
4469 EliminateNestedLocks = false;
4470 }
4471 if (!Inline) {
4472 IncrementalInline = false;
4473 }
4474 #ifndef PRODUCT
4475 if (!IncrementalInline) {
4476 AlwaysIncrementalInline = false;
4477 }
4478 #endif
4479 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4480 // nothing to use the profiling, turn if off
4481 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4482 }
4483 #endif
4484
4485 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4486 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4487 DebugNonSafepoints = true;
4488 }
4489
4490 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4491 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4492 }
4493
4494 if (UseOnStackReplacement && !UseLoopCounter) {
4495 warning("On-stack-replacement requires loop counters; enabling loop counters");
4496 FLAG_SET_DEFAULT(UseLoopCounter, true);
4497 }
4498
4499 #ifndef PRODUCT
4500 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4501 if (use_vm_log()) {
4502 LogVMOutput = true;
4503 }
4504 }
4505 #endif // PRODUCT
4506
4507 if (PrintCommandLineFlags) {
4508 CommandLineFlags::printSetFlags(tty);
4509 }
4510
4511 // Apply CPU specific policy for the BiasedLocking
4512 if (UseBiasedLocking) {
4513 if (!VM_Version::use_biased_locking() &&
4514 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4515 UseBiasedLocking = false;
4516 }
4517 }
4518 #ifdef COMPILER2
4519 if (!UseBiasedLocking || EmitSync != 0) {
4520 UseOptoBiasInlining = false;
4521 }
4522 #endif
4523
4524 return JNI_OK;
4525 }
4526
4527 jint Arguments::adjust_after_os() {
4528 if (UseNUMA) {
4529 if (UseParallelGC || UseParallelOldGC) {
4530 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4531 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4532 }
4533 }
4534 // UseNUMAInterleaving is set to ON for all collectors and
4535 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4536 // such as the parallel collector for Linux and Solaris will
4537 // interleave old gen and survivor spaces on top of NUMA
4538 // allocation policy for the eden space.
4539 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4540 // all platforms and ParallelGC on Windows will interleave all
4541 // of the heap spaces across NUMA nodes.
4542 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4543 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4544 }
4545 }
4546 return JNI_OK;
4547 }
4548
4549 int Arguments::PropertyList_count(SystemProperty* pl) {
4550 int count = 0;
4551 while(pl != NULL) {
4552 count++;
4553 pl = pl->next();
4554 }
4555 return count;
4556 }
4557
4558 // Return the number of readable properties.
4559 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4560 int count = 0;
4561 while(pl != NULL) {
4562 if (pl->is_readable()) {
4563 count++;
4564 }
4565 pl = pl->next();
4566 }
4567 return count;
4568 }
4569
4570 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4571 assert(key != NULL, "just checking");
4572 SystemProperty* prop;
4573 for (prop = pl; prop != NULL; prop = prop->next()) {
4574 if (strcmp(key, prop->key()) == 0) return prop->value();
4575 }
4576 return NULL;
4577 }
4578
4579 // Return the value of the requested property provided that it is a readable property.
4580 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4581 assert(key != NULL, "just checking");
4582 SystemProperty* prop;
4583 // Return the property value if the keys match and the property is not internal or
4584 // it's the special internal property "jdk.boot.class.path.append".
4585 for (prop = pl; prop != NULL; prop = prop->next()) {
4586 if (strcmp(key, prop->key()) == 0) {
4587 if (!prop->internal()) {
4588 return prop->value();
4589 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4590 return prop->value();
4591 } else {
4592 // Property is internal and not jdk.boot.class.path.append so return NULL.
4593 return NULL;
4594 }
4595 }
4596 }
4597 return NULL;
4598 }
4599
4600 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4601 int count = 0;
4602 const char* ret_val = NULL;
4603
4604 while(pl != NULL) {
4605 if(count >= index) {
4606 ret_val = pl->key();
4607 break;
4608 }
4609 count++;
4610 pl = pl->next();
4611 }
4612
4613 return ret_val;
4614 }
4615
4616 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4617 int count = 0;
4618 char* ret_val = NULL;
4619
4620 while(pl != NULL) {
4621 if(count >= index) {
4622 ret_val = pl->value();
4623 break;
4624 }
4625 count++;
4626 pl = pl->next();
4627 }
4628
4629 return ret_val;
4630 }
4631
4632 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4633 SystemProperty* p = *plist;
4634 if (p == NULL) {
4635 *plist = new_p;
4636 } else {
4637 while (p->next() != NULL) {
4638 p = p->next();
4639 }
4640 p->set_next(new_p);
4641 }
4642 }
4643
4644 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4645 bool writeable, bool internal) {
4646 if (plist == NULL)
4647 return;
4648
4649 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4650 PropertyList_add(plist, new_p);
4651 }
4652
4653 void Arguments::PropertyList_add(SystemProperty *element) {
4654 PropertyList_add(&_system_properties, element);
4655 }
4656
4657 // This add maintains unique property key in the list.
4658 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4659 PropertyAppendable append, PropertyWriteable writeable,
4660 PropertyInternal internal) {
4661 if (plist == NULL)
4662 return;
4663
4664 // If property key exist then update with new value.
4665 SystemProperty* prop;
4666 for (prop = *plist; prop != NULL; prop = prop->next()) {
4667 if (strcmp(k, prop->key()) == 0) {
4668 if (append == AppendProperty) {
4669 prop->append_value(v);
4670 } else {
4671 prop->set_value(v);
4672 }
4673 return;
4674 }
4675 }
4676
4677 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4678 }
4679
4680 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4681 // Returns true if all of the source pointed by src has been copied over to
4682 // the destination buffer pointed by buf. Otherwise, returns false.
4683 // Notes:
4684 // 1. If the length (buflen) of the destination buffer excluding the
4685 // NULL terminator character is not long enough for holding the expanded
4686 // pid characters, it also returns false instead of returning the partially
4687 // expanded one.
4688 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4689 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4690 char* buf, size_t buflen) {
4691 const char* p = src;
4692 char* b = buf;
4693 const char* src_end = &src[srclen];
4694 char* buf_end = &buf[buflen - 1];
4695
4696 while (p < src_end && b < buf_end) {
4697 if (*p == '%') {
4698 switch (*(++p)) {
4699 case '%': // "%%" ==> "%"
4700 *b++ = *p++;
4701 break;
4702 case 'p': { // "%p" ==> current process id
4703 // buf_end points to the character before the last character so
4704 // that we could write '\0' to the end of the buffer.
4705 size_t buf_sz = buf_end - b + 1;
4706 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4707
4708 // if jio_snprintf fails or the buffer is not long enough to hold
4709 // the expanded pid, returns false.
4710 if (ret < 0 || ret >= (int)buf_sz) {
4711 return false;
4712 } else {
4713 b += ret;
4714 assert(*b == '\0', "fail in copy_expand_pid");
4715 if (p == src_end && b == buf_end + 1) {
4716 // reach the end of the buffer.
4717 return true;
4718 }
4719 }
4720 p++;
4721 break;
4722 }
4723 default :
4724 *b++ = '%';
4725 }
4726 } else {
4727 *b++ = *p++;
4728 }
4729 }
4730 *b = '\0';
4731 return (p == src_end); // return false if not all of the source was copied
4732 }