1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciRuntime.hpp"
60 #endif
61 #if INCLUDE_ALL_GCS
62 #include "gc/cms/compactibleFreeListSpace.hpp"
63 #include "gc/g1/g1CollectedHeap.inline.hpp"
64 #include "gc/parallel/parallelScavengeHeap.hpp"
65 #endif // INCLUDE_ALL_GCS
66
67 // Note: This is a special bug reporting site for the JVM
68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
116 bool Arguments::_has_jimage = false;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 bool needs_module_property_warning = false;
166
167 #define MODULE_PROPERTY_PREFIX "jdk.module."
168 #define MODULE_PROPERTY_PREFIX_LEN 11
169 #define ADDEXPORTS "addexports"
170 #define ADDEXPORTS_LEN 10
171 #define ADDREADS "addreads"
172 #define ADDREADS_LEN 8
173 #define ADDOPENS "addopens"
174 #define ADDOPENS_LEN 8
175 #define PATCH "patch"
176 #define PATCH_LEN 5
177 #define ADDMODS "addmods"
178 #define ADDMODS_LEN 7
179 #define LIMITMODS "limitmods"
180 #define LIMITMODS_LEN 9
181 #define PATH "path"
182 #define PATH_LEN 4
183 #define UPGRADE_PATH "upgrade.path"
184 #define UPGRADE_PATH_LEN 12
185
186 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
187 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
188 return ((strncmp(option, property, len) == 0) &&
189 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
190 }
191
192 // Return true if property starts with "jdk.module." and its ensuing chars match
193 // any of the reserved module properties.
194 // property should be passed without the leading "-D".
195 bool Arguments::is_internal_module_property(const char* property) {
196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
205 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
207 return true;
208 }
209 }
210 return false;
211 }
212
213 // Process java launcher properties.
214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
216 // sun.java.launcher.pid is defined.
217 // Must do this before setting up other system properties,
218 // as some of them may depend on launcher type.
219 for (int index = 0; index < args->nOptions; index++) {
220 const JavaVMOption* option = args->options + index;
221 const char* tail;
222
223 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
224 process_java_launcher_argument(tail, option->extraInfo);
225 continue;
226 }
227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
228 if (strcmp(tail, "true") == 0) {
229 _sun_java_launcher_is_altjvm = true;
230 }
231 continue;
232 }
233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
234 _sun_java_launcher_pid = atoi(tail);
235 continue;
236 }
237 }
238 }
239
240 // Initialize system properties key and value.
241 void Arguments::init_system_properties() {
242
243 // Set up _system_boot_class_path which is not a property but
244 // relies heavily on argument processing and the jdk.boot.class.path.append
245 // property. It is used to store the underlying system boot class path.
246 _system_boot_class_path = new PathString(NULL);
247
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
249 "Java Virtual Machine Specification", false));
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
254
255 // Following are JVMTI agent writable properties.
256 // Properties values are set to NULL and they are
257 // os specific they are initialized in os::init_system_properties_values().
258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
259 _java_library_path = new SystemProperty("java.library.path", NULL, true);
260 _java_home = new SystemProperty("java.home", NULL, true);
261 _java_class_path = new SystemProperty("java.class.path", "", true);
262 // jdk.boot.class.path.append is a non-writeable, internal property.
263 // It can only be set by either:
264 // - -Xbootclasspath/a:
265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
267
268 // Add to System Property list.
269 PropertyList_add(&_system_properties, _sun_boot_library_path);
270 PropertyList_add(&_system_properties, _java_library_path);
271 PropertyList_add(&_system_properties, _java_home);
272 PropertyList_add(&_system_properties, _java_class_path);
273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
274
275 // Set OS specific system properties values
276 os::init_system_properties_values();
277 }
278
279 // Update/Initialize System properties after JDK version number is known
280 void Arguments::init_version_specific_system_properties() {
281 enum { bufsz = 16 };
282 char buffer[bufsz];
283 const char* spec_vendor = "Oracle Corporation";
284 uint32_t spec_version = JDK_Version::current().major_version();
285
286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
287
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.version", buffer, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
294 }
295
296 /*
297 * -XX argument processing:
298 *
299 * -XX arguments are defined in several places, such as:
300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
301 * -XX arguments are parsed in parse_argument().
302 * -XX argument bounds checking is done in check_vm_args_consistency().
303 *
304 * Over time -XX arguments may change. There are mechanisms to handle common cases:
305 *
306 * ALIASED: An option that is simply another name for another option. This is often
307 * part of the process of deprecating a flag, but not all aliases need
308 * to be deprecated.
309 *
310 * Create an alias for an option by adding the old and new option names to the
311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
312 *
313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
314 * support may be removed in the future. Both regular and aliased options may be
315 * deprecated.
316 *
317 * Add a deprecation warning for an option (or alias) by adding an entry in the
318 * "special_jvm_flags" table and setting the "deprecated_in" field.
319 * Often an option "deprecated" in one major release will
320 * be made "obsolete" in the next. In this case the entry should also have it's
321 * "obsolete_in" field set.
322 *
323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
324 * on the command line. A warning is printed to let the user know that option might not
325 * be accepted in the future.
326 *
327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
328 * table and setting the "obsolete_in" field.
329 *
330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
331 * to the current JDK version. The system will flatly refuse to admit the existence of
332 * the flag. This allows a flag to die automatically over JDK releases.
333 *
334 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
336 * - Newly obsolete or expired deprecated options should have their global variable
337 * definitions removed (from globals.hpp, etc) and related implementations removed.
338 *
339 * Recommended approach for removing options:
340 *
341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
343 *
344 * To remove internal options (e.g. diagnostic, experimental, develop options), use
345 * a 2-step model adding major release numbers to the obsolete and expire columns.
346 *
347 * To change the name of an option, use the alias table as well as a 2-step
348 * model adding major release numbers to the deprecate and expire columns.
349 * Think twice about aliasing commonly used customer options.
350 *
351 * There are times when it is appropriate to leave a future release number as undefined.
352 *
353 * Tests: Aliases should be tested in VMAliasOptions.java.
354 * Deprecated options should be tested in VMDeprecatedOptions.java.
355 */
356
357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
360 // the command-line as usual, but will issue a warning.
361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
362 // the command-line, while issuing a warning and ignoring the flag value.
363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
364 // existence of the flag.
365 //
366 // MANUAL CLEANUP ON JDK VERSION UPDATES:
367 // This table ensures that the handling of options will update automatically when the JDK
368 // version is incremented, but the source code needs to be cleanup up manually:
369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
370 // variable should be removed, as well as users of the variable.
371 // - As "deprecated" options age into "obsolete" options, move the entry into the
372 // "Obsolete Flags" section of the table.
373 // - All expired options should be removed from the table.
374 static SpecialFlag const special_jvm_flags[] = {
375 // -------------- Deprecated Flags --------------
376 // --- Non-alias flags - sorted by obsolete_in then expired_in:
377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
380 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
381 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
382 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
383 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
384 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
385
386 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
387 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
390 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
391 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
392 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
393 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
394
395 // -------------- Obsolete Flags - sorted by expired_in --------------
396 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
397 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
398 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
399 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
400 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
401 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
402 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
403 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
404 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
405 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
406 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
407 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
408 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
409 #ifndef ZERO
410 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
411 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
412 #endif // ZERO
413 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
414 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
415 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
416 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
417 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
418 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
419 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
420 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
421 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
422 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
423 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
424 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
425 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) },
426
427 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
428 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
429 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
430 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
431 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
432 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
433 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
434 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
435 #endif
436
437 { NULL, JDK_Version(0), JDK_Version(0) }
438 };
439
440 // Flags that are aliases for other flags.
441 typedef struct {
442 const char* alias_name;
443 const char* real_name;
444 } AliasedFlag;
445
446 static AliasedFlag const aliased_jvm_flags[] = {
447 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
448 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
449 { "CMSMarkStackSize", "MarkStackSize" },
450 { "G1MarkStackSize", "MarkStackSize" },
451 { "ParallelMarkingThreads", "ConcGCThreads" },
452 { "ParallelCMSThreads", "ConcGCThreads" },
453 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
454 { NULL, NULL}
455 };
456
457 // NOTE: A compatibility request will be necessary for each alias to be removed.
458 static AliasedLoggingFlag const aliased_logging_flags[] = {
459 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
460 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
461 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
462 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
463 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
464 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
465 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
466 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
467 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
468 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
469 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
470 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
471 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
472 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
473 };
474
475 #ifndef PRODUCT
476 // These options are removed in jdk9. Remove this code for jdk10.
477 static AliasedFlag const removed_develop_logging_flags[] = {
478 { "TraceClassInitialization", "-Xlog:class+init" },
479 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
480 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
481 { "TraceItables", "-Xlog:itables=debug" },
482 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
483 { "TraceSafepoint", "-Xlog:safepoint=debug" },
484 { "TraceStartupTime", "-Xlog:startuptime" },
485 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
486 { "PrintVtables", "-Xlog:vtables=debug" },
487 { "VerboseVerification", "-Xlog:verification" },
488 { NULL, NULL }
489 };
490 #endif //PRODUCT
491
492 // Return true if "v" is less than "other", where "other" may be "undefined".
493 static bool version_less_than(JDK_Version v, JDK_Version other) {
494 assert(!v.is_undefined(), "must be defined");
495 if (!other.is_undefined() && v.compare(other) >= 0) {
496 return false;
497 } else {
498 return true;
499 }
500 }
501
502 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
503
504 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
505 // Allow extensions to have priority
506 if (lookup_special_flag_ext(flag_name, flag)) {
507 return true;
508 }
509
510 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
511 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
512 flag = special_jvm_flags[i];
513 return true;
514 }
515 }
516 return false;
517 }
518
519 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
520 assert(version != NULL, "Must provide a version buffer");
521 SpecialFlag flag;
522 if (lookup_special_flag(flag_name, flag)) {
523 if (!flag.obsolete_in.is_undefined()) {
524 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
525 *version = flag.obsolete_in;
526 return true;
527 }
528 }
529 }
530 return false;
531 }
532
533 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
534 assert(version != NULL, "Must provide a version buffer");
535 SpecialFlag flag;
536 if (lookup_special_flag(flag_name, flag)) {
537 if (!flag.deprecated_in.is_undefined()) {
538 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
539 version_less_than(JDK_Version::current(), flag.expired_in)) {
540 *version = flag.deprecated_in;
541 return 1;
542 } else {
543 return -1;
544 }
545 }
546 }
547 return 0;
548 }
549
550 #ifndef PRODUCT
551 const char* Arguments::removed_develop_logging_flag_name(const char* name){
552 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
553 const AliasedFlag& flag = removed_develop_logging_flags[i];
554 if (strcmp(flag.alias_name, name) == 0) {
555 return flag.real_name;
556 }
557 }
558 return NULL;
559 }
560 #endif // PRODUCT
561
562 const char* Arguments::real_flag_name(const char *flag_name) {
563 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
564 const AliasedFlag& flag_status = aliased_jvm_flags[i];
565 if (strcmp(flag_status.alias_name, flag_name) == 0) {
566 return flag_status.real_name;
567 }
568 }
569 return flag_name;
570 }
571
572 #ifdef ASSERT
573 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
574 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
575 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
576 return true;
577 }
578 }
579 return false;
580 }
581
582 static bool verify_special_jvm_flags() {
583 bool success = true;
584 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
585 const SpecialFlag& flag = special_jvm_flags[i];
586 if (lookup_special_flag(flag.name, i)) {
587 warning("Duplicate special flag declaration \"%s\"", flag.name);
588 success = false;
589 }
590 if (flag.deprecated_in.is_undefined() &&
591 flag.obsolete_in.is_undefined()) {
592 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
593 success = false;
594 }
595
596 if (!flag.deprecated_in.is_undefined()) {
597 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
598 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
599 success = false;
600 }
601
602 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
603 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
604 success = false;
605 }
606 }
607
608 if (!flag.obsolete_in.is_undefined()) {
609 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
610 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
611 success = false;
612 }
613
614 // if flag has become obsolete it should not have a "globals" flag defined anymore.
615 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
616 if (Flag::find_flag(flag.name) != NULL) {
617 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
618 success = false;
619 }
620 }
621 }
622
623 if (!flag.expired_in.is_undefined()) {
624 // if flag has become expired it should not have a "globals" flag defined anymore.
625 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
626 if (Flag::find_flag(flag.name) != NULL) {
627 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
628 success = false;
629 }
630 }
631 }
632
633 }
634 return success;
635 }
636 #endif
637
638 // Parses a size specification string.
639 bool Arguments::atojulong(const char *s, julong* result) {
640 julong n = 0;
641
642 // First char must be a digit. Don't allow negative numbers or leading spaces.
643 if (!isdigit(*s)) {
644 return false;
645 }
646
647 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
648 char* remainder;
649 errno = 0;
650 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
651 if (errno != 0) {
652 return false;
653 }
654
655 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
656 if (remainder == s || strlen(remainder) > 1) {
657 return false;
658 }
659
660 switch (*remainder) {
661 case 'T': case 't':
662 *result = n * G * K;
663 // Check for overflow.
664 if (*result/((julong)G * K) != n) return false;
665 return true;
666 case 'G': case 'g':
667 *result = n * G;
668 if (*result/G != n) return false;
669 return true;
670 case 'M': case 'm':
671 *result = n * M;
672 if (*result/M != n) return false;
673 return true;
674 case 'K': case 'k':
675 *result = n * K;
676 if (*result/K != n) return false;
677 return true;
678 case '\0':
679 *result = n;
680 return true;
681 default:
682 return false;
683 }
684 }
685
686 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
687 if (size < min_size) return arg_too_small;
688 // Check that size will fit in a size_t (only relevant on 32-bit)
689 if (size > max_uintx) return arg_too_big;
690 return arg_in_range;
691 }
692
693 // Describe an argument out of range error
694 void Arguments::describe_range_error(ArgsRange errcode) {
695 switch(errcode) {
696 case arg_too_big:
697 jio_fprintf(defaultStream::error_stream(),
698 "The specified size exceeds the maximum "
699 "representable size.\n");
700 break;
701 case arg_too_small:
702 case arg_unreadable:
703 case arg_in_range:
704 // do nothing for now
705 break;
706 default:
707 ShouldNotReachHere();
708 }
709 }
710
711 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
712 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
713 return true;
714 } else {
715 return false;
716 }
717 }
718
719 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
720 char* end;
721 errno = 0;
722 double v = strtod(value, &end);
723 if ((errno != 0) || (*end != 0)) {
724 return false;
725 }
726
727 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
728 return true;
729 }
730 return false;
731 }
732
733 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
734 julong v;
735 int int_v;
736 intx intx_v;
737 bool is_neg = false;
738 Flag* result = Flag::find_flag(name, strlen(name));
739
740 if (result == NULL) {
741 return false;
742 }
743
744 // Check the sign first since atojulong() parses only unsigned values.
745 if (*value == '-') {
746 if (!result->is_intx() && !result->is_int()) {
747 return false;
748 }
749 value++;
750 is_neg = true;
751 }
752 if (!Arguments::atojulong(value, &v)) {
753 return false;
754 }
755 if (result->is_int()) {
756 int_v = (int) v;
757 if (is_neg) {
758 int_v = -int_v;
759 }
760 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
761 } else if (result->is_uint()) {
762 uint uint_v = (uint) v;
763 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
764 } else if (result->is_intx()) {
765 intx_v = (intx) v;
766 if (is_neg) {
767 intx_v = -intx_v;
768 }
769 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
770 } else if (result->is_uintx()) {
771 uintx uintx_v = (uintx) v;
772 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
773 } else if (result->is_uint64_t()) {
774 uint64_t uint64_t_v = (uint64_t) v;
775 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
776 } else if (result->is_size_t()) {
777 size_t size_t_v = (size_t) v;
778 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
779 } else {
780 return false;
781 }
782 }
783
784 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
785 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
786 // Contract: CommandLineFlags always returns a pointer that needs freeing.
787 FREE_C_HEAP_ARRAY(char, value);
788 return true;
789 }
790
791 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
792 const char* old_value = "";
793 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
794 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
795 size_t new_len = strlen(new_value);
796 const char* value;
797 char* free_this_too = NULL;
798 if (old_len == 0) {
799 value = new_value;
800 } else if (new_len == 0) {
801 value = old_value;
802 } else {
803 size_t length = old_len + 1 + new_len + 1;
804 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
805 // each new setting adds another LINE to the switch:
806 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
807 value = buf;
808 free_this_too = buf;
809 }
810 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
811 // CommandLineFlags always returns a pointer that needs freeing.
812 FREE_C_HEAP_ARRAY(char, value);
813 if (free_this_too != NULL) {
814 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
815 FREE_C_HEAP_ARRAY(char, free_this_too);
816 }
817 return true;
818 }
819
820 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
821 const char* real_name = real_flag_name(arg);
822 JDK_Version since = JDK_Version();
823 switch (is_deprecated_flag(arg, &since)) {
824 case -1:
825 return NULL; // obsolete or expired, don't process normally
826 case 0:
827 return real_name;
828 case 1: {
829 if (warn) {
830 char version[256];
831 since.to_string(version, sizeof(version));
832 if (real_name != arg) {
833 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
834 arg, version, real_name);
835 } else {
836 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
837 arg, version);
838 }
839 }
840 return real_name;
841 }
842 }
843 ShouldNotReachHere();
844 return NULL;
845 }
846
847 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
848 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
849 // Set tagset string buffer at max size of 256, large enough for any alias tagset
850 const int max_tagset_size = 256;
851 int max_tagset_len = max_tagset_size - 1;
852 char tagset_buffer[max_tagset_size];
853 tagset_buffer[0] = '\0';
854
855 // Write tag-set for aliased logging option, in string list form
856 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
857 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
858 if (i > 0) {
859 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
860 }
861 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
862 }
863 if (!alf.exactMatch) {
864 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
865 }
866 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
867 (on) ? "+" : "-",
868 name,
869 tagset_buffer,
870 (on) ? LogLevel::name(alf.level) : "off");
871 }
872
873 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
874 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
875 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
876 if (strcmp(alf.alias_name, name) == 0) {
877 log_deprecated_flag(name, on, alf);
878 return alf;
879 }
880 }
881 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
882 return a;
883 }
884
885 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
886
887 // range of acceptable characters spelled out for portability reasons
888 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
889 #define BUFLEN 255
890 char name[BUFLEN+1];
891 char dummy;
892 const char* real_name;
893 bool warn_if_deprecated = true;
894
895 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
896 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
897 if (alf.alias_name != NULL){
898 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
899 return true;
900 }
901 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
902 if (real_name == NULL) {
903 return false;
904 }
905 return set_bool_flag(real_name, false, origin);
906 }
907 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
908 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
909 if (alf.alias_name != NULL){
910 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
911 return true;
912 }
913 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
914 if (real_name == NULL) {
915 return false;
916 }
917 return set_bool_flag(real_name, true, origin);
918 }
919
920 char punct;
921 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
922 const char* value = strchr(arg, '=') + 1;
923 Flag* flag;
924
925 // this scanf pattern matches both strings (handled here) and numbers (handled later))
926 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
927 if (alf.alias_name != NULL) {
928 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
929 return true;
930 }
931 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
932 if (real_name == NULL) {
933 return false;
934 }
935 flag = Flag::find_flag(real_name);
936 if (flag != NULL && flag->is_ccstr()) {
937 if (flag->ccstr_accumulates()) {
938 return append_to_string_flag(real_name, value, origin);
939 } else {
940 if (value[0] == '\0') {
941 value = NULL;
942 }
943 return set_string_flag(real_name, value, origin);
944 }
945 } else {
946 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
947 }
948 }
949
950 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
951 const char* value = strchr(arg, '=') + 1;
952 // -XX:Foo:=xxx will reset the string flag to the given value.
953 if (value[0] == '\0') {
954 value = NULL;
955 }
956 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
957 if (real_name == NULL) {
958 return false;
959 }
960 return set_string_flag(real_name, value, origin);
961 }
962
963 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
964 #define SIGNED_NUMBER_RANGE "[-0123456789]"
965 #define NUMBER_RANGE "[0123456789eE+-]"
966 char value[BUFLEN + 1];
967 char value2[BUFLEN + 1];
968 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
969 // Looks like a floating-point number -- try again with more lenient format string
970 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
971 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
972 if (real_name == NULL) {
973 return false;
974 }
975 return set_fp_numeric_flag(real_name, value, origin);
976 }
977 }
978
979 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
980 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
981 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
982 if (real_name == NULL) {
983 return false;
984 }
985 return set_numeric_flag(real_name, value, origin);
986 }
987
988 return false;
989 }
990
991 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
992 assert(bldarray != NULL, "illegal argument");
993
994 if (arg == NULL) {
995 return;
996 }
997
998 int new_count = *count + 1;
999
1000 // expand the array and add arg to the last element
1001 if (*bldarray == NULL) {
1002 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1003 } else {
1004 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1005 }
1006 (*bldarray)[*count] = os::strdup_check_oom(arg);
1007 *count = new_count;
1008 }
1009
1010 void Arguments::build_jvm_args(const char* arg) {
1011 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1012 }
1013
1014 void Arguments::build_jvm_flags(const char* arg) {
1015 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1016 }
1017
1018 // utility function to return a string that concatenates all
1019 // strings in a given char** array
1020 const char* Arguments::build_resource_string(char** args, int count) {
1021 if (args == NULL || count == 0) {
1022 return NULL;
1023 }
1024 size_t length = 0;
1025 for (int i = 0; i < count; i++) {
1026 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1027 }
1028 char* s = NEW_RESOURCE_ARRAY(char, length);
1029 char* dst = s;
1030 for (int j = 0; j < count; j++) {
1031 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1032 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1033 dst += offset;
1034 length -= offset;
1035 }
1036 return (const char*) s;
1037 }
1038
1039 void Arguments::print_on(outputStream* st) {
1040 st->print_cr("VM Arguments:");
1041 if (num_jvm_flags() > 0) {
1042 st->print("jvm_flags: "); print_jvm_flags_on(st);
1043 st->cr();
1044 }
1045 if (num_jvm_args() > 0) {
1046 st->print("jvm_args: "); print_jvm_args_on(st);
1047 st->cr();
1048 }
1049 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1050 if (_java_class_path != NULL) {
1051 char* path = _java_class_path->value();
1052 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1053 }
1054 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1055 }
1056
1057 void Arguments::print_summary_on(outputStream* st) {
1058 // Print the command line. Environment variables that are helpful for
1059 // reproducing the problem are written later in the hs_err file.
1060 // flags are from setting file
1061 if (num_jvm_flags() > 0) {
1062 st->print_raw("Settings File: ");
1063 print_jvm_flags_on(st);
1064 st->cr();
1065 }
1066 // args are the command line and environment variable arguments.
1067 st->print_raw("Command Line: ");
1068 if (num_jvm_args() > 0) {
1069 print_jvm_args_on(st);
1070 }
1071 // this is the classfile and any arguments to the java program
1072 if (java_command() != NULL) {
1073 st->print("%s", java_command());
1074 }
1075 st->cr();
1076 }
1077
1078 void Arguments::print_jvm_flags_on(outputStream* st) {
1079 if (_num_jvm_flags > 0) {
1080 for (int i=0; i < _num_jvm_flags; i++) {
1081 st->print("%s ", _jvm_flags_array[i]);
1082 }
1083 }
1084 }
1085
1086 void Arguments::print_jvm_args_on(outputStream* st) {
1087 if (_num_jvm_args > 0) {
1088 for (int i=0; i < _num_jvm_args; i++) {
1089 st->print("%s ", _jvm_args_array[i]);
1090 }
1091 }
1092 }
1093
1094 bool Arguments::process_argument(const char* arg,
1095 jboolean ignore_unrecognized,
1096 Flag::Flags origin) {
1097 JDK_Version since = JDK_Version();
1098
1099 if (parse_argument(arg, origin)) {
1100 return true;
1101 }
1102
1103 // Determine if the flag has '+', '-', or '=' characters.
1104 bool has_plus_minus = (*arg == '+' || *arg == '-');
1105 const char* const argname = has_plus_minus ? arg + 1 : arg;
1106
1107 size_t arg_len;
1108 const char* equal_sign = strchr(argname, '=');
1109 if (equal_sign == NULL) {
1110 arg_len = strlen(argname);
1111 } else {
1112 arg_len = equal_sign - argname;
1113 }
1114
1115 // Only make the obsolete check for valid arguments.
1116 if (arg_len <= BUFLEN) {
1117 // Construct a string which consists only of the argument name without '+', '-', or '='.
1118 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1119 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1120 if (is_obsolete_flag(stripped_argname, &since)) {
1121 char version[256];
1122 since.to_string(version, sizeof(version));
1123 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1124 return true;
1125 }
1126 #ifndef PRODUCT
1127 else {
1128 const char* replacement;
1129 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1130 log_warning(arguments)("%s has been removed. Please use %s instead.",
1131 stripped_argname,
1132 replacement);
1133 return false;
1134 }
1135 }
1136 #endif //PRODUCT
1137 }
1138
1139 // For locked flags, report a custom error message if available.
1140 // Otherwise, report the standard unrecognized VM option.
1141 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1142 if (found_flag != NULL) {
1143 char locked_message_buf[BUFLEN];
1144 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1145 if (strlen(locked_message_buf) == 0) {
1146 if (found_flag->is_bool() && !has_plus_minus) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Missing +/- setting for VM option '%s'\n", argname);
1149 } else if (!found_flag->is_bool() && has_plus_minus) {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Unexpected +/- setting in VM option '%s'\n", argname);
1152 } else {
1153 jio_fprintf(defaultStream::error_stream(),
1154 "Improperly specified VM option '%s'\n", argname);
1155 }
1156 } else {
1157 #ifdef PRODUCT
1158 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1159 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1160 if (ignore_unrecognized && mismatched) {
1161 return true;
1162 }
1163 #endif
1164 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1165 }
1166 } else {
1167 if (ignore_unrecognized) {
1168 return true;
1169 }
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Unrecognized VM option '%s'\n", argname);
1172 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1173 if (fuzzy_matched != NULL) {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "Did you mean '%s%s%s'? ",
1176 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1177 fuzzy_matched->_name,
1178 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1179 }
1180 }
1181
1182 // allow for commandline "commenting out" options like -XX:#+Verbose
1183 return arg[0] == '#';
1184 }
1185
1186 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1187 FILE* stream = fopen(file_name, "rb");
1188 if (stream == NULL) {
1189 if (should_exist) {
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Could not open settings file %s\n", file_name);
1192 return false;
1193 } else {
1194 return true;
1195 }
1196 }
1197
1198 char token[1024];
1199 int pos = 0;
1200
1201 bool in_white_space = true;
1202 bool in_comment = false;
1203 bool in_quote = false;
1204 char quote_c = 0;
1205 bool result = true;
1206
1207 int c = getc(stream);
1208 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1209 if (in_white_space) {
1210 if (in_comment) {
1211 if (c == '\n') in_comment = false;
1212 } else {
1213 if (c == '#') in_comment = true;
1214 else if (!isspace(c)) {
1215 in_white_space = false;
1216 token[pos++] = c;
1217 }
1218 }
1219 } else {
1220 if (c == '\n' || (!in_quote && isspace(c))) {
1221 // token ends at newline, or at unquoted whitespace
1222 // this allows a way to include spaces in string-valued options
1223 token[pos] = '\0';
1224 logOption(token);
1225 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1226 build_jvm_flags(token);
1227 pos = 0;
1228 in_white_space = true;
1229 in_quote = false;
1230 } else if (!in_quote && (c == '\'' || c == '"')) {
1231 in_quote = true;
1232 quote_c = c;
1233 } else if (in_quote && (c == quote_c)) {
1234 in_quote = false;
1235 } else {
1236 token[pos++] = c;
1237 }
1238 }
1239 c = getc(stream);
1240 }
1241 if (pos > 0) {
1242 token[pos] = '\0';
1243 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1244 build_jvm_flags(token);
1245 }
1246 fclose(stream);
1247 return result;
1248 }
1249
1250 //=============================================================================================================
1251 // Parsing of properties (-D)
1252
1253 const char* Arguments::get_property(const char* key) {
1254 return PropertyList_get_value(system_properties(), key);
1255 }
1256
1257 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1258 const char* eq = strchr(prop, '=');
1259 const char* key;
1260 const char* value = "";
1261
1262 if (eq == NULL) {
1263 // property doesn't have a value, thus use passed string
1264 key = prop;
1265 } else {
1266 // property have a value, thus extract it and save to the
1267 // allocated string
1268 size_t key_len = eq - prop;
1269 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1270
1271 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1272 key = tmp_key;
1273
1274 value = &prop[key_len + 1];
1275 }
1276
1277 if (strcmp(key, "java.compiler") == 0) {
1278 process_java_compiler_argument(value);
1279 // Record value in Arguments, but let it get passed to Java.
1280 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1281 strcmp(key, "sun.java.launcher.pid") == 0) {
1282 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1283 // private and are processed in process_sun_java_launcher_properties();
1284 // the sun.java.launcher property is passed on to the java application
1285 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1286 // append is true, writable is true, internal is false
1287 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1288 WriteableProperty, ExternalProperty);
1289 } else {
1290 if (strcmp(key, "sun.java.command") == 0) {
1291 char *old_java_command = _java_command;
1292 _java_command = os::strdup_check_oom(value, mtArguments);
1293 if (old_java_command != NULL) {
1294 os::free(old_java_command);
1295 }
1296 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1297 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1298 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1299 // its value without going through the property list or making a Java call.
1300 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1301 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1302 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1303 os::free((void *)old_java_vendor_url_bug);
1304 }
1305 }
1306
1307 // Create new property and add at the end of the list
1308 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1309 }
1310
1311 if (key != prop) {
1312 // SystemProperty copy passed value, thus free previously allocated
1313 // memory
1314 FreeHeap((void *)key);
1315 }
1316
1317 return true;
1318 }
1319
1320 #if INCLUDE_CDS
1321 void Arguments::check_unsupported_dumping_properties() {
1322 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1323 const char* unsupported_properties[] = { "jdk.module.main",
1324 "jdk.module.limitmods",
1325 "jdk.module.path",
1326 "jdk.module.upgrade.path",
1327 "jdk.module.addmods.0",
1328 "jdk.module.patch.0" };
1329 const char* unsupported_options[] = { "-m", // cannot use at dump time
1330 "--limit-modules", // ignored at dump time
1331 "--module-path", // ignored at dump time
1332 "--upgrade-module-path", // ignored at dump time
1333 "--add-modules", // ignored at dump time
1334 "--patch-module" // ignored at dump time
1335 };
1336 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1337 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1338 // vm will exit with an error message. Otherwise, it will print an informational message if
1339 // PrintSharedSpaces is enabled.
1340 uint info_idx = 1;
1341 SystemProperty* sp = system_properties();
1342 while (sp != NULL) {
1343 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1344 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1345 if (i < info_idx) {
1346 vm_exit_during_initialization(
1347 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1348 } else {
1349 if (PrintSharedSpaces) {
1350 tty->print_cr(
1351 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1352 }
1353 }
1354 }
1355 }
1356 sp = sp->next();
1357 }
1358
1359 // Check for an exploded module build in use with -Xshare:dump.
1360 if (!has_jimage()) {
1361 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1362 }
1363 }
1364 #endif
1365
1366 //===========================================================================================================
1367 // Setting int/mixed/comp mode flags
1368
1369 void Arguments::set_mode_flags(Mode mode) {
1370 // Set up default values for all flags.
1371 // If you add a flag to any of the branches below,
1372 // add a default value for it here.
1373 set_java_compiler(false);
1374 _mode = mode;
1375
1376 // Ensure Agent_OnLoad has the correct initial values.
1377 // This may not be the final mode; mode may change later in onload phase.
1378 PropertyList_unique_add(&_system_properties, "java.vm.info",
1379 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1380
1381 UseInterpreter = true;
1382 UseCompiler = true;
1383 UseLoopCounter = true;
1384
1385 // Default values may be platform/compiler dependent -
1386 // use the saved values
1387 ClipInlining = Arguments::_ClipInlining;
1388 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1389 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1390 BackgroundCompilation = Arguments::_BackgroundCompilation;
1391 if (TieredCompilation) {
1392 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1393 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1394 }
1395 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1396 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1397 }
1398 }
1399
1400 // Change from defaults based on mode
1401 switch (mode) {
1402 default:
1403 ShouldNotReachHere();
1404 break;
1405 case _int:
1406 UseCompiler = false;
1407 UseLoopCounter = false;
1408 AlwaysCompileLoopMethods = false;
1409 UseOnStackReplacement = false;
1410 break;
1411 case _mixed:
1412 // same as default
1413 break;
1414 case _comp:
1415 UseInterpreter = false;
1416 BackgroundCompilation = false;
1417 ClipInlining = false;
1418 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1419 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1420 // compile a level 4 (C2) and then continue executing it.
1421 if (TieredCompilation) {
1422 Tier3InvokeNotifyFreqLog = 0;
1423 Tier4InvocationThreshold = 0;
1424 }
1425 break;
1426 }
1427 }
1428
1429 // Conflict: required to use shared spaces (-Xshare:on), but
1430 // incompatible command line options were chosen.
1431 static void no_shared_spaces(const char* message) {
1432 if (RequireSharedSpaces) {
1433 jio_fprintf(defaultStream::error_stream(),
1434 "Class data sharing is inconsistent with other specified options.\n");
1435 vm_exit_during_initialization("Unable to use shared archive.", message);
1436 } else {
1437 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1438 }
1439 }
1440
1441 // Returns threshold scaled with the value of scale.
1442 // If scale < 0.0, threshold is returned without scaling.
1443 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1444 if (scale == 1.0 || scale < 0.0) {
1445 return threshold;
1446 } else {
1447 return (intx)(threshold * scale);
1448 }
1449 }
1450
1451 // Returns freq_log scaled with the value of scale.
1452 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1453 // If scale < 0.0, freq_log is returned without scaling.
1454 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1455 // Check if scaling is necessary or if negative value was specified.
1456 if (scale == 1.0 || scale < 0.0) {
1457 return freq_log;
1458 }
1459 // Check values to avoid calculating log2 of 0.
1460 if (scale == 0.0 || freq_log == 0) {
1461 return 0;
1462 }
1463 // Determine the maximum notification frequency value currently supported.
1464 // The largest mask value that the interpreter/C1 can handle is
1465 // of length InvocationCounter::number_of_count_bits. Mask values are always
1466 // one bit shorter then the value of the notification frequency. Set
1467 // max_freq_bits accordingly.
1468 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1469 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1470 if (scaled_freq == 0) {
1471 // Return 0 right away to avoid calculating log2 of 0.
1472 return 0;
1473 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1474 return max_freq_bits;
1475 } else {
1476 return log2_intptr(scaled_freq);
1477 }
1478 }
1479
1480 void Arguments::set_tiered_flags() {
1481 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1482 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1483 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1484 }
1485 if (CompilationPolicyChoice < 2) {
1486 vm_exit_during_initialization(
1487 "Incompatible compilation policy selected", NULL);
1488 }
1489 // Increase the code cache size - tiered compiles a lot more.
1490 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1491 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1492 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1493 }
1494 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1495 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1496 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1497 }
1498 if (!UseInterpreter) { // -Xcomp
1499 Tier3InvokeNotifyFreqLog = 0;
1500 Tier4InvocationThreshold = 0;
1501 }
1502
1503 if (CompileThresholdScaling < 0) {
1504 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1505 }
1506
1507 // Scale tiered compilation thresholds.
1508 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1509 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1510 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1511 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1512
1513 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1514 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1515 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1516 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1517
1518 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1519 // once these thresholds become supported.
1520
1521 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1522 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1523
1524 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1525 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1526
1527 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1528
1529 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1530 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1531 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1532 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1533 }
1534 }
1535
1536 #if INCLUDE_ALL_GCS
1537 static void disable_adaptive_size_policy(const char* collector_name) {
1538 if (UseAdaptiveSizePolicy) {
1539 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1540 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1541 collector_name);
1542 }
1543 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1544 }
1545 }
1546
1547 void Arguments::set_parnew_gc_flags() {
1548 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1549 "control point invariant");
1550 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1551 assert(UseParNewGC, "ParNew should always be used with CMS");
1552
1553 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1554 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1555 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1556 } else if (ParallelGCThreads == 0) {
1557 jio_fprintf(defaultStream::error_stream(),
1558 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1559 vm_exit(1);
1560 }
1561
1562 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1563 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1564 // we set them to 1024 and 1024.
1565 // See CR 6362902.
1566 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1567 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1568 }
1569 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1570 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1571 }
1572
1573 // When using compressed oops, we use local overflow stacks,
1574 // rather than using a global overflow list chained through
1575 // the klass word of the object's pre-image.
1576 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1577 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1578 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1579 }
1580 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1581 }
1582 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1583 }
1584
1585 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1586 // sparc/solaris for certain applications, but would gain from
1587 // further optimization and tuning efforts, and would almost
1588 // certainly gain from analysis of platform and environment.
1589 void Arguments::set_cms_and_parnew_gc_flags() {
1590 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1591 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1592 assert(UseParNewGC, "ParNew should always be used with CMS");
1593
1594 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1595 disable_adaptive_size_policy("UseConcMarkSweepGC");
1596
1597 set_parnew_gc_flags();
1598
1599 size_t max_heap = align_size_down(MaxHeapSize,
1600 CardTableRS::ct_max_alignment_constraint());
1601
1602 // Now make adjustments for CMS
1603 intx tenuring_default = (intx)6;
1604 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1605
1606 // Preferred young gen size for "short" pauses:
1607 // upper bound depends on # of threads and NewRatio.
1608 const size_t preferred_max_new_size_unaligned =
1609 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1610 size_t preferred_max_new_size =
1611 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1612
1613 // Unless explicitly requested otherwise, size young gen
1614 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1615
1616 // If either MaxNewSize or NewRatio is set on the command line,
1617 // assume the user is trying to set the size of the young gen.
1618 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1619
1620 // Set MaxNewSize to our calculated preferred_max_new_size unless
1621 // NewSize was set on the command line and it is larger than
1622 // preferred_max_new_size.
1623 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1624 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1625 } else {
1626 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1627 }
1628 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1629
1630 // Code along this path potentially sets NewSize and OldSize
1631 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1632 min_heap_size(), InitialHeapSize, max_heap);
1633 size_t min_new = preferred_max_new_size;
1634 if (FLAG_IS_CMDLINE(NewSize)) {
1635 min_new = NewSize;
1636 }
1637 if (max_heap > min_new && min_heap_size() > min_new) {
1638 // Unless explicitly requested otherwise, make young gen
1639 // at least min_new, and at most preferred_max_new_size.
1640 if (FLAG_IS_DEFAULT(NewSize)) {
1641 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1642 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1643 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1644 }
1645 // Unless explicitly requested otherwise, size old gen
1646 // so it's NewRatio x of NewSize.
1647 if (FLAG_IS_DEFAULT(OldSize)) {
1648 if (max_heap > NewSize) {
1649 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1650 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1651 }
1652 }
1653 }
1654 }
1655 // Unless explicitly requested otherwise, definitely
1656 // promote all objects surviving "tenuring_default" scavenges.
1657 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1658 FLAG_IS_DEFAULT(SurvivorRatio)) {
1659 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1660 }
1661 // If we decided above (or user explicitly requested)
1662 // `promote all' (via MaxTenuringThreshold := 0),
1663 // prefer minuscule survivor spaces so as not to waste
1664 // space for (non-existent) survivors
1665 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1666 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1667 }
1668
1669 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1670 // but rather the number of free blocks of a given size that are used when
1671 // replenishing the local per-worker free list caches.
1672 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1673 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1674 // OldPLAB sizing manually turned off: Use a larger default setting,
1675 // unless it was manually specified. This is because a too-low value
1676 // will slow down scavenges.
1677 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1678 } else {
1679 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1680 }
1681 }
1682
1683 // If either of the static initialization defaults have changed, note this
1684 // modification.
1685 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1686 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1687 }
1688
1689 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1690 }
1691 #endif // INCLUDE_ALL_GCS
1692
1693 void set_object_alignment() {
1694 // Object alignment.
1695 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1696 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1697 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1698 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1699 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1700 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1701
1702 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1703 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1704
1705 // Oop encoding heap max
1706 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1707
1708 if (SurvivorAlignmentInBytes == 0) {
1709 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1710 }
1711
1712 #if INCLUDE_ALL_GCS
1713 // Set CMS global values
1714 CompactibleFreeListSpace::set_cms_values();
1715 #endif // INCLUDE_ALL_GCS
1716 }
1717
1718 size_t Arguments::max_heap_for_compressed_oops() {
1719 // Avoid sign flip.
1720 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1721 // We need to fit both the NULL page and the heap into the memory budget, while
1722 // keeping alignment constraints of the heap. To guarantee the latter, as the
1723 // NULL page is located before the heap, we pad the NULL page to the conservative
1724 // maximum alignment that the GC may ever impose upon the heap.
1725 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1726 _conservative_max_heap_alignment);
1727
1728 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1729 NOT_LP64(ShouldNotReachHere(); return 0);
1730 }
1731
1732 bool Arguments::should_auto_select_low_pause_collector() {
1733 if (UseAutoGCSelectPolicy &&
1734 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1735 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1736 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1737 return true;
1738 }
1739 return false;
1740 }
1741
1742 void Arguments::set_use_compressed_oops() {
1743 #ifndef ZERO
1744 #ifdef _LP64
1745 // MaxHeapSize is not set up properly at this point, but
1746 // the only value that can override MaxHeapSize if we are
1747 // to use UseCompressedOops is InitialHeapSize.
1748 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1749
1750 if (max_heap_size <= max_heap_for_compressed_oops()) {
1751 #if !defined(COMPILER1) || defined(TIERED)
1752 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1753 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1754 }
1755 #endif
1756 } else {
1757 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1758 warning("Max heap size too large for Compressed Oops");
1759 FLAG_SET_DEFAULT(UseCompressedOops, false);
1760 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1761 }
1762 }
1763 #endif // _LP64
1764 #endif // ZERO
1765 }
1766
1767
1768 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1769 // set_use_compressed_oops().
1770 void Arguments::set_use_compressed_klass_ptrs() {
1771 #ifndef ZERO
1772 #ifdef _LP64
1773 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1774 if (!UseCompressedOops) {
1775 if (UseCompressedClassPointers) {
1776 warning("UseCompressedClassPointers requires UseCompressedOops");
1777 }
1778 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1779 } else {
1780 // Turn on UseCompressedClassPointers too
1781 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1782 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1783 }
1784 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1785 if (UseCompressedClassPointers) {
1786 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1787 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1788 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1789 }
1790 }
1791 }
1792 #endif // _LP64
1793 #endif // !ZERO
1794 }
1795
1796 void Arguments::set_conservative_max_heap_alignment() {
1797 // The conservative maximum required alignment for the heap is the maximum of
1798 // the alignments imposed by several sources: any requirements from the heap
1799 // itself, the collector policy and the maximum page size we may run the VM
1800 // with.
1801 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1802 #if INCLUDE_ALL_GCS
1803 if (UseParallelGC) {
1804 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1805 } else if (UseG1GC) {
1806 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1807 }
1808 #endif // INCLUDE_ALL_GCS
1809 _conservative_max_heap_alignment = MAX4(heap_alignment,
1810 (size_t)os::vm_allocation_granularity(),
1811 os::max_page_size(),
1812 CollectorPolicy::compute_heap_alignment());
1813 }
1814
1815 bool Arguments::gc_selected() {
1816 #if INCLUDE_ALL_GCS
1817 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1818 #else
1819 return UseSerialGC;
1820 #endif // INCLUDE_ALL_GCS
1821 }
1822
1823 #ifdef TIERED
1824 bool Arguments::compilation_mode_selected() {
1825 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1826 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1827
1828 }
1829
1830 void Arguments::select_compilation_mode_ergonomically() {
1831 #if defined(_WINDOWS) && !defined(_LP64)
1832 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1833 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1834 }
1835 #endif
1836 if (NeverActAsServerClassMachine) {
1837 set_client_compilation_mode();
1838 }
1839 }
1840 #endif //TIERED
1841
1842 void Arguments::select_gc_ergonomically() {
1843 #if INCLUDE_ALL_GCS
1844 if (os::is_server_class_machine()) {
1845 if (!UseAutoGCSelectPolicy) {
1846 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1847 } else {
1848 if (should_auto_select_low_pause_collector()) {
1849 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1850 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true);
1851 } else {
1852 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1853 }
1854 }
1855 } else {
1856 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1857 }
1858 #else
1859 UNSUPPORTED_OPTION(UseG1GC);
1860 UNSUPPORTED_OPTION(UseParallelGC);
1861 UNSUPPORTED_OPTION(UseParallelOldGC);
1862 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1863 UNSUPPORTED_OPTION(UseParNewGC);
1864 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1865 #endif // INCLUDE_ALL_GCS
1866 }
1867
1868 void Arguments::select_gc() {
1869 if (!gc_selected()) {
1870 select_gc_ergonomically();
1871 if (!gc_selected()) {
1872 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1873 }
1874 }
1875 }
1876
1877 #if INCLUDE_JVMCI
1878 void Arguments::set_jvmci_specific_flags() {
1879 if (UseJVMCICompiler) {
1880 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1881 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1882 }
1883 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1884 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1885 }
1886 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1887 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1888 }
1889 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1890 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1891 }
1892 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1893 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1894 }
1895 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1896 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1897 }
1898 if (TieredStopAtLevel != CompLevel_full_optimization) {
1899 // Currently JVMCI compiler can only work at the full optimization level
1900 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1901 TieredStopAtLevel = CompLevel_full_optimization;
1902 }
1903 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1904 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1905 }
1906 }
1907 }
1908 #endif
1909
1910 void Arguments::set_ergonomics_flags() {
1911 #ifdef TIERED
1912 if (!compilation_mode_selected()) {
1913 select_compilation_mode_ergonomically();
1914 }
1915 #endif
1916 select_gc();
1917
1918 #if defined(COMPILER2) || INCLUDE_JVMCI
1919 // Shared spaces work fine with other GCs but causes bytecode rewriting
1920 // to be disabled, which hurts interpreter performance and decreases
1921 // server performance. When -server is specified, keep the default off
1922 // unless it is asked for. Future work: either add bytecode rewriting
1923 // at link time, or rewrite bytecodes in non-shared methods.
1924 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1925 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1926 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1927 }
1928 #endif
1929
1930 set_conservative_max_heap_alignment();
1931
1932 #ifndef ZERO
1933 #ifdef _LP64
1934 set_use_compressed_oops();
1935
1936 // set_use_compressed_klass_ptrs() must be called after calling
1937 // set_use_compressed_oops().
1938 set_use_compressed_klass_ptrs();
1939
1940 // Also checks that certain machines are slower with compressed oops
1941 // in vm_version initialization code.
1942 #endif // _LP64
1943 #endif // !ZERO
1944
1945 }
1946
1947 void Arguments::set_parallel_gc_flags() {
1948 assert(UseParallelGC || UseParallelOldGC, "Error");
1949 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1950 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1951 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1952 }
1953 FLAG_SET_DEFAULT(UseParallelGC, true);
1954
1955 // If no heap maximum was requested explicitly, use some reasonable fraction
1956 // of the physical memory, up to a maximum of 1GB.
1957 FLAG_SET_DEFAULT(ParallelGCThreads,
1958 Abstract_VM_Version::parallel_worker_threads());
1959 if (ParallelGCThreads == 0) {
1960 jio_fprintf(defaultStream::error_stream(),
1961 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1962 vm_exit(1);
1963 }
1964
1965 if (UseAdaptiveSizePolicy) {
1966 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1967 // unless the user actually sets these flags.
1968 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1969 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1970 }
1971 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1972 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1973 }
1974 }
1975
1976 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1977 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1978 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1979 // See CR 6362902 for details.
1980 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1981 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1982 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1983 }
1984 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1985 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1986 }
1987 }
1988
1989 if (UseParallelOldGC) {
1990 // Par compact uses lower default values since they are treated as
1991 // minimums. These are different defaults because of the different
1992 // interpretation and are not ergonomically set.
1993 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1994 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1995 }
1996 }
1997 }
1998
1999 void Arguments::set_g1_gc_flags() {
2000 assert(UseG1GC, "Error");
2001 #if defined(COMPILER1) || INCLUDE_JVMCI
2002 FastTLABRefill = false;
2003 #endif
2004 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
2005 if (ParallelGCThreads == 0) {
2006 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
2007 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
2008 }
2009
2010 #if INCLUDE_ALL_GCS
2011 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
2012 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
2013 }
2014 #endif
2015
2016 // MarkStackSize will be set (if it hasn't been set by the user)
2017 // when concurrent marking is initialized.
2018 // Its value will be based upon the number of parallel marking threads.
2019 // But we do set the maximum mark stack size here.
2020 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
2021 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
2022 }
2023
2024 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2025 // In G1, we want the default GC overhead goal to be higher than
2026 // it is for PS, or the heap might be expanded too aggressively.
2027 // We set it here to ~8%.
2028 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2029 }
2030
2031 // Below, we might need to calculate the pause time interval based on
2032 // the pause target. When we do so we are going to give G1 maximum
2033 // flexibility and allow it to do pauses when it needs to. So, we'll
2034 // arrange that the pause interval to be pause time target + 1 to
2035 // ensure that a) the pause time target is maximized with respect to
2036 // the pause interval and b) we maintain the invariant that pause
2037 // time target < pause interval. If the user does not want this
2038 // maximum flexibility, they will have to set the pause interval
2039 // explicitly.
2040
2041 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
2042 // The default pause time target in G1 is 200ms
2043 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
2044 }
2045
2046 // Then, if the interval parameter was not set, set it according to
2047 // the pause time target (this will also deal with the case when the
2048 // pause time target is the default value).
2049 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
2050 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
2051 }
2052
2053 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2054 }
2055
2056 void Arguments::set_gc_specific_flags() {
2057 #if INCLUDE_ALL_GCS
2058 // Set per-collector flags
2059 if (UseParallelGC || UseParallelOldGC) {
2060 set_parallel_gc_flags();
2061 } else if (UseConcMarkSweepGC) {
2062 set_cms_and_parnew_gc_flags();
2063 } else if (UseG1GC) {
2064 set_g1_gc_flags();
2065 }
2066 if (AssumeMP && !UseSerialGC) {
2067 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2068 warning("If the number of processors is expected to increase from one, then"
2069 " you should configure the number of parallel GC threads appropriately"
2070 " using -XX:ParallelGCThreads=N");
2071 }
2072 }
2073 if (MinHeapFreeRatio == 100) {
2074 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2075 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2076 }
2077
2078 // If class unloading is disabled, also disable concurrent class unloading.
2079 if (!ClassUnloading) {
2080 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2081 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2082 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2083 }
2084 #endif // INCLUDE_ALL_GCS
2085 }
2086
2087 julong Arguments::limit_by_allocatable_memory(julong limit) {
2088 julong max_allocatable;
2089 julong result = limit;
2090 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2091 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2092 }
2093 return result;
2094 }
2095
2096 // Use static initialization to get the default before parsing
2097 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2098
2099 void Arguments::set_heap_size() {
2100 julong phys_mem =
2101 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2102 : (julong)MaxRAM;
2103
2104 // Experimental support for CGroup memory limits
2105 if (UseCGroupMemoryLimitForHeap) {
2106 // This is a rough indicator that a CGroup limit may be in force
2107 // for this process
2108 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2109 FILE *fp = fopen(lim_file, "r");
2110 if (fp != NULL) {
2111 julong cgroup_max = 0;
2112 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2113 if (ret == 1 && cgroup_max > 0) {
2114 // If unlimited, cgroup_max will be a very large, but unspecified
2115 // value, so use initial phys_mem as a limit
2116 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2117 JULONG_FORMAT "MB) and initial phys_mem ("
2118 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2119 phys_mem = MIN2(cgroup_max, phys_mem);
2120 } else {
2121 warning("Unable to read/parse cgroup memory limit from %s: %s",
2122 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2123 }
2124 fclose(fp);
2125 } else {
2126 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2127 }
2128 }
2129
2130 // If the maximum heap size has not been set with -Xmx,
2131 // then set it as fraction of the size of physical memory,
2132 // respecting the maximum and minimum sizes of the heap.
2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2134 julong reasonable_max = phys_mem / MaxRAMFraction;
2135
2136 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2137 // Small physical memory, so use a minimum fraction of it for the heap
2138 reasonable_max = phys_mem / MinRAMFraction;
2139 } else {
2140 // Not-small physical memory, so require a heap at least
2141 // as large as MaxHeapSize
2142 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2143 }
2144 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2145 // Limit the heap size to ErgoHeapSizeLimit
2146 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2147 }
2148 if (UseCompressedOops) {
2149 // Limit the heap size to the maximum possible when using compressed oops
2150 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2151
2152 // HeapBaseMinAddress can be greater than default but not less than.
2153 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2154 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2155 // matches compressed oops printing flags
2156 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2157 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2158 DefaultHeapBaseMinAddress,
2159 DefaultHeapBaseMinAddress/G,
2160 HeapBaseMinAddress);
2161 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2162 }
2163 }
2164
2165 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2166 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2167 // but it should be not less than default MaxHeapSize.
2168 max_coop_heap -= HeapBaseMinAddress;
2169 }
2170 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2171 }
2172 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2173
2174 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2175 // An initial heap size was specified on the command line,
2176 // so be sure that the maximum size is consistent. Done
2177 // after call to limit_by_allocatable_memory because that
2178 // method might reduce the allocation size.
2179 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2180 }
2181
2182 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2183 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2184 }
2185
2186 // If the minimum or initial heap_size have not been set or requested to be set
2187 // ergonomically, set them accordingly.
2188 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2189 julong reasonable_minimum = (julong)(OldSize + NewSize);
2190
2191 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2192
2193 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2194
2195 if (InitialHeapSize == 0) {
2196 julong reasonable_initial = phys_mem / InitialRAMFraction;
2197
2198 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2199 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2200
2201 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2202
2203 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2204 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2205 }
2206 // If the minimum heap size has not been set (via -Xms),
2207 // synchronize with InitialHeapSize to avoid errors with the default value.
2208 if (min_heap_size() == 0) {
2209 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2210 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2211 }
2212 }
2213 }
2214
2215 // This option inspects the machine and attempts to set various
2216 // parameters to be optimal for long-running, memory allocation
2217 // intensive jobs. It is intended for machines with large
2218 // amounts of cpu and memory.
2219 jint Arguments::set_aggressive_heap_flags() {
2220 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2221 // VM, but we may not be able to represent the total physical memory
2222 // available (like having 8gb of memory on a box but using a 32bit VM).
2223 // Thus, we need to make sure we're using a julong for intermediate
2224 // calculations.
2225 julong initHeapSize;
2226 julong total_memory = os::physical_memory();
2227
2228 if (total_memory < (julong) 256 * M) {
2229 jio_fprintf(defaultStream::error_stream(),
2230 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2231 vm_exit(1);
2232 }
2233
2234 // The heap size is half of available memory, or (at most)
2235 // all of possible memory less 160mb (leaving room for the OS
2236 // when using ISM). This is the maximum; because adaptive sizing
2237 // is turned on below, the actual space used may be smaller.
2238
2239 initHeapSize = MIN2(total_memory / (julong) 2,
2240 total_memory - (julong) 160 * M);
2241
2242 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2243
2244 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2245 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2246 return JNI_EINVAL;
2247 }
2248 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2249 return JNI_EINVAL;
2250 }
2251 // Currently the minimum size and the initial heap sizes are the same.
2252 set_min_heap_size(initHeapSize);
2253 }
2254 if (FLAG_IS_DEFAULT(NewSize)) {
2255 // Make the young generation 3/8ths of the total heap.
2256 if (FLAG_SET_CMDLINE(size_t, NewSize,
2257 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2258 return JNI_EINVAL;
2259 }
2260 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2261 return JNI_EINVAL;
2262 }
2263 }
2264
2265 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2266 FLAG_SET_DEFAULT(UseLargePages, true);
2267 #endif
2268
2269 // Increase some data structure sizes for efficiency
2270 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2271 return JNI_EINVAL;
2272 }
2273 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2274 return JNI_EINVAL;
2275 }
2276 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2277 return JNI_EINVAL;
2278 }
2279
2280 // See the OldPLABSize comment below, but replace 'after promotion'
2281 // with 'after copying'. YoungPLABSize is the size of the survivor
2282 // space per-gc-thread buffers. The default is 4kw.
2283 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2284 return JNI_EINVAL;
2285 }
2286
2287 // OldPLABSize is the size of the buffers in the old gen that
2288 // UseParallelGC uses to promote live data that doesn't fit in the
2289 // survivor spaces. At any given time, there's one for each gc thread.
2290 // The default size is 1kw. These buffers are rarely used, since the
2291 // survivor spaces are usually big enough. For specjbb, however, there
2292 // are occasions when there's lots of live data in the young gen
2293 // and we end up promoting some of it. We don't have a definite
2294 // explanation for why bumping OldPLABSize helps, but the theory
2295 // is that a bigger PLAB results in retaining something like the
2296 // original allocation order after promotion, which improves mutator
2297 // locality. A minor effect may be that larger PLABs reduce the
2298 // number of PLAB allocation events during gc. The value of 8kw
2299 // was arrived at by experimenting with specjbb.
2300 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2301 return JNI_EINVAL;
2302 }
2303
2304 // Enable parallel GC and adaptive generation sizing
2305 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2306 return JNI_EINVAL;
2307 }
2308 FLAG_SET_DEFAULT(ParallelGCThreads,
2309 Abstract_VM_Version::parallel_worker_threads());
2310
2311 // Encourage steady state memory management
2312 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2313 return JNI_EINVAL;
2314 }
2315
2316 // This appears to improve mutator locality
2317 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2318 return JNI_EINVAL;
2319 }
2320
2321 // Get around early Solaris scheduling bug
2322 // (affinity vs other jobs on system)
2323 // but disallow DR and offlining (5008695).
2324 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2325 return JNI_EINVAL;
2326 }
2327
2328 return JNI_OK;
2329 }
2330
2331 // This must be called after ergonomics.
2332 void Arguments::set_bytecode_flags() {
2333 if (!RewriteBytecodes) {
2334 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2335 }
2336 }
2337
2338 // Aggressive optimization flags -XX:+AggressiveOpts
2339 jint Arguments::set_aggressive_opts_flags() {
2340 #ifdef COMPILER2
2341 if (AggressiveUnboxing) {
2342 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2343 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2344 } else if (!EliminateAutoBox) {
2345 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2346 AggressiveUnboxing = false;
2347 }
2348 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2349 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2350 } else if (!DoEscapeAnalysis) {
2351 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2352 AggressiveUnboxing = false;
2353 }
2354 }
2355 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2356 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2357 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2358 }
2359 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2360 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2361 }
2362
2363 // Feed the cache size setting into the JDK
2364 char buffer[1024];
2365 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2366 if (!add_property(buffer)) {
2367 return JNI_ENOMEM;
2368 }
2369 }
2370 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2371 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2372 }
2373 #endif
2374
2375 if (AggressiveOpts) {
2376 // Sample flag setting code
2377 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2378 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2379 // }
2380 }
2381
2382 return JNI_OK;
2383 }
2384
2385 //===========================================================================================================
2386 // Parsing of java.compiler property
2387
2388 void Arguments::process_java_compiler_argument(const char* arg) {
2389 // For backwards compatibility, Djava.compiler=NONE or ""
2390 // causes us to switch to -Xint mode UNLESS -Xdebug
2391 // is also specified.
2392 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2393 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2394 }
2395 }
2396
2397 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2398 _sun_java_launcher = os::strdup_check_oom(launcher);
2399 }
2400
2401 bool Arguments::created_by_java_launcher() {
2402 assert(_sun_java_launcher != NULL, "property must have value");
2403 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2404 }
2405
2406 bool Arguments::sun_java_launcher_is_altjvm() {
2407 return _sun_java_launcher_is_altjvm;
2408 }
2409
2410 //===========================================================================================================
2411 // Parsing of main arguments
2412
2413 #if INCLUDE_JVMCI
2414 // Check consistency of jvmci vm argument settings.
2415 bool Arguments::check_jvmci_args_consistency() {
2416 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2417 }
2418 #endif //INCLUDE_JVMCI
2419
2420 // Check consistency of GC selection
2421 bool Arguments::check_gc_consistency() {
2422 // Ensure that the user has not selected conflicting sets
2423 // of collectors.
2424 uint i = 0;
2425 if (UseSerialGC) i++;
2426 if (UseConcMarkSweepGC) i++;
2427 if (UseParallelGC || UseParallelOldGC) i++;
2428 if (UseG1GC) i++;
2429 if (i > 1) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Conflicting collector combinations in option list; "
2432 "please refer to the release notes for the combinations "
2433 "allowed\n");
2434 return false;
2435 }
2436
2437 if (UseConcMarkSweepGC && !UseParNewGC) {
2438 jio_fprintf(defaultStream::error_stream(),
2439 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2440 return false;
2441 }
2442
2443 if (UseParNewGC && !UseConcMarkSweepGC) {
2444 jio_fprintf(defaultStream::error_stream(),
2445 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2446 return false;
2447 }
2448
2449 return true;
2450 }
2451
2452 // Check the consistency of vm_init_args
2453 bool Arguments::check_vm_args_consistency() {
2454 // Method for adding checks for flag consistency.
2455 // The intent is to warn the user of all possible conflicts,
2456 // before returning an error.
2457 // Note: Needs platform-dependent factoring.
2458 bool status = true;
2459
2460 if (TLABRefillWasteFraction == 0) {
2461 jio_fprintf(defaultStream::error_stream(),
2462 "TLABRefillWasteFraction should be a denominator, "
2463 "not " SIZE_FORMAT "\n",
2464 TLABRefillWasteFraction);
2465 status = false;
2466 }
2467
2468 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2469 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2470 }
2471
2472 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2473 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2474 }
2475
2476 if (GCTimeLimit == 100) {
2477 // Turn off gc-overhead-limit-exceeded checks
2478 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2479 }
2480
2481 status = status && check_gc_consistency();
2482
2483 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2484 // insists that we hold the requisite locks so that the iteration is
2485 // MT-safe. For the verification at start-up and shut-down, we don't
2486 // yet have a good way of acquiring and releasing these locks,
2487 // which are not visible at the CollectedHeap level. We want to
2488 // be able to acquire these locks and then do the iteration rather
2489 // than just disable the lock verification. This will be fixed under
2490 // bug 4788986.
2491 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2492 if (VerifyDuringStartup) {
2493 warning("Heap verification at start-up disabled "
2494 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2495 VerifyDuringStartup = false; // Disable verification at start-up
2496 }
2497
2498 if (VerifyBeforeExit) {
2499 warning("Heap verification at shutdown disabled "
2500 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2501 VerifyBeforeExit = false; // Disable verification at shutdown
2502 }
2503 }
2504
2505 if (PrintNMTStatistics) {
2506 #if INCLUDE_NMT
2507 if (MemTracker::tracking_level() == NMT_off) {
2508 #endif // INCLUDE_NMT
2509 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2510 PrintNMTStatistics = false;
2511 #if INCLUDE_NMT
2512 }
2513 #endif
2514 }
2515
2516 #if INCLUDE_JVMCI
2517 status = status && check_jvmci_args_consistency();
2518
2519 if (EnableJVMCI) {
2520 if (!ScavengeRootsInCode) {
2521 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2522 ScavengeRootsInCode = 1;
2523 }
2524 }
2525 #endif
2526
2527 // Check lower bounds of the code cache
2528 // Template Interpreter code is approximately 3X larger in debug builds.
2529 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2530 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2533 os::vm_page_size()/K);
2534 status = false;
2535 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2536 jio_fprintf(defaultStream::error_stream(),
2537 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2538 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2539 status = false;
2540 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2543 min_code_cache_size/K);
2544 status = false;
2545 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2546 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2549 CODE_CACHE_SIZE_LIMIT/M);
2550 status = false;
2551 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2554 min_code_cache_size/K);
2555 status = false;
2556 }
2557
2558 #ifdef _LP64
2559 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2560 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2561 }
2562 #endif
2563
2564 #ifndef SUPPORT_RESERVED_STACK_AREA
2565 if (StackReservedPages != 0) {
2566 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2567 warning("Reserved Stack Area not supported on this platform");
2568 }
2569 #endif
2570
2571 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2572 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2573 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2574 }
2575 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2576 }
2577 if (UseCompiler && is_interpreter_only()) {
2578 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2579 warning("UseCompiler disabled due to -Xint.");
2580 }
2581 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2582 }
2583 #ifdef COMPILER2
2584 if (PostLoopMultiversioning && !RangeCheckElimination) {
2585 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2586 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2587 }
2588 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2589 }
2590 #endif
2591 return status;
2592 }
2593
2594 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2595 const char* option_type) {
2596 if (ignore) return false;
2597
2598 const char* spacer = " ";
2599 if (option_type == NULL) {
2600 option_type = ++spacer; // Set both to the empty string.
2601 }
2602
2603 if (os::obsolete_option(option)) {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Obsolete %s%soption: %s\n", option_type, spacer,
2606 option->optionString);
2607 return false;
2608 } else {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Unrecognized %s%soption: %s\n", option_type, spacer,
2611 option->optionString);
2612 return true;
2613 }
2614 }
2615
2616 static const char* user_assertion_options[] = {
2617 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2618 };
2619
2620 static const char* system_assertion_options[] = {
2621 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2622 };
2623
2624 bool Arguments::parse_uintx(const char* value,
2625 uintx* uintx_arg,
2626 uintx min_size) {
2627
2628 // Check the sign first since atojulong() parses only unsigned values.
2629 bool value_is_positive = !(*value == '-');
2630
2631 if (value_is_positive) {
2632 julong n;
2633 bool good_return = atojulong(value, &n);
2634 if (good_return) {
2635 bool above_minimum = n >= min_size;
2636 bool value_is_too_large = n > max_uintx;
2637
2638 if (above_minimum && !value_is_too_large) {
2639 *uintx_arg = n;
2640 return true;
2641 }
2642 }
2643 }
2644 return false;
2645 }
2646
2647 unsigned int addreads_count = 0;
2648 unsigned int addexports_count = 0;
2649 unsigned int addopens_count = 0;
2650 unsigned int addmods_count = 0;
2651 unsigned int patch_mod_count = 0;
2652
2653 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2654 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2655 char* property = AllocateHeap(prop_len, mtArguments);
2656 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2657 if (ret < 0 || ret >= (int)prop_len) {
2658 FreeHeap(property);
2659 return false;
2660 }
2661 bool added = add_property(property, UnwriteableProperty, internal);
2662 FreeHeap(property);
2663 return added;
2664 }
2665
2666 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2667 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2668 if (count < 1000) {
2669 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2670 char* property = AllocateHeap(prop_len, mtArguments);
2671 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2672 if (ret < 0 || ret >= (int)prop_len) {
2673 FreeHeap(property);
2674 return false;
2675 }
2676 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2677 FreeHeap(property);
2678 return added;
2679 }
2680 return false;
2681 }
2682
2683 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2684 julong* long_arg,
2685 julong min_size) {
2686 if (!atojulong(s, long_arg)) return arg_unreadable;
2687 return check_memory_size(*long_arg, min_size);
2688 }
2689
2690 // Parse JavaVMInitArgs structure
2691
2692 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2693 const JavaVMInitArgs *java_options_args,
2694 const JavaVMInitArgs *cmd_line_args) {
2695 bool patch_mod_javabase = false;
2696
2697 // Save default settings for some mode flags
2698 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2699 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2700 Arguments::_ClipInlining = ClipInlining;
2701 Arguments::_BackgroundCompilation = BackgroundCompilation;
2702 if (TieredCompilation) {
2703 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2704 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2705 }
2706
2707 // Setup flags for mixed which is the default
2708 set_mode_flags(_mixed);
2709
2710 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2711 // variable (if present).
2712 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2713 if (result != JNI_OK) {
2714 return result;
2715 }
2716
2717 // Parse args structure generated from the command line flags.
2718 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2719 if (result != JNI_OK) {
2720 return result;
2721 }
2722
2723 // Parse args structure generated from the _JAVA_OPTIONS environment
2724 // variable (if present) (mimics classic VM)
2725 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2726 if (result != JNI_OK) {
2727 return result;
2728 }
2729
2730 // Do final processing now that all arguments have been parsed
2731 result = finalize_vm_init_args();
2732 if (result != JNI_OK) {
2733 return result;
2734 }
2735
2736 #if INCLUDE_CDS
2737 if (UseSharedSpaces && patch_mod_javabase) {
2738 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2739 }
2740 #endif
2741
2742 return JNI_OK;
2743 }
2744
2745 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2746 // represents a valid JDWP agent. is_path==true denotes that we
2747 // are dealing with -agentpath (case where name is a path), otherwise with
2748 // -agentlib
2749 bool valid_jdwp_agent(char *name, bool is_path) {
2750 char *_name;
2751 const char *_jdwp = "jdwp";
2752 size_t _len_jdwp, _len_prefix;
2753
2754 if (is_path) {
2755 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2756 return false;
2757 }
2758
2759 _name++; // skip past last path separator
2760 _len_prefix = strlen(JNI_LIB_PREFIX);
2761
2762 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2763 return false;
2764 }
2765
2766 _name += _len_prefix;
2767 _len_jdwp = strlen(_jdwp);
2768
2769 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2770 _name += _len_jdwp;
2771 }
2772 else {
2773 return false;
2774 }
2775
2776 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2777 return false;
2778 }
2779
2780 return true;
2781 }
2782
2783 if (strcmp(name, _jdwp) == 0) {
2784 return true;
2785 }
2786
2787 return false;
2788 }
2789
2790 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2791 // --patch-module=<module>=<file>(<pathsep><file>)*
2792 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2793 // Find the equal sign between the module name and the path specification
2794 const char* module_equal = strchr(patch_mod_tail, '=');
2795 if (module_equal == NULL) {
2796 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2797 return JNI_ERR;
2798 } else {
2799 // Pick out the module name
2800 size_t module_len = module_equal - patch_mod_tail;
2801 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2802 if (module_name != NULL) {
2803 memcpy(module_name, patch_mod_tail, module_len);
2804 *(module_name + module_len) = '\0';
2805 // The path piece begins one past the module_equal sign
2806 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2807 FREE_C_HEAP_ARRAY(char, module_name);
2808 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2809 return JNI_ENOMEM;
2810 }
2811 } else {
2812 return JNI_ENOMEM;
2813 }
2814 }
2815 return JNI_OK;
2816 }
2817
2818 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2819 // For match_option to return remaining or value part of option string
2820 const char* tail;
2821
2822 // iterate over arguments
2823 for (int index = 0; index < args->nOptions; index++) {
2824 bool is_absolute_path = false; // for -agentpath vs -agentlib
2825
2826 const JavaVMOption* option = args->options + index;
2827
2828 if (!match_option(option, "-Djava.class.path", &tail) &&
2829 !match_option(option, "-Dsun.java.command", &tail) &&
2830 !match_option(option, "-Dsun.java.launcher", &tail)) {
2831
2832 // add all jvm options to the jvm_args string. This string
2833 // is used later to set the java.vm.args PerfData string constant.
2834 // the -Djava.class.path and the -Dsun.java.command options are
2835 // omitted from jvm_args string as each have their own PerfData
2836 // string constant object.
2837 build_jvm_args(option->optionString);
2838 }
2839
2840 // -verbose:[class/gc/jni]
2841 if (match_option(option, "-verbose", &tail)) {
2842 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2843 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2844 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2845 } else if (!strcmp(tail, ":gc")) {
2846 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2847 } else if (!strcmp(tail, ":jni")) {
2848 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2849 return JNI_EINVAL;
2850 }
2851 }
2852 // -da / -ea / -disableassertions / -enableassertions
2853 // These accept an optional class/package name separated by a colon, e.g.,
2854 // -da:java.lang.Thread.
2855 } else if (match_option(option, user_assertion_options, &tail, true)) {
2856 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2857 if (*tail == '\0') {
2858 JavaAssertions::setUserClassDefault(enable);
2859 } else {
2860 assert(*tail == ':', "bogus match by match_option()");
2861 JavaAssertions::addOption(tail + 1, enable);
2862 }
2863 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2864 } else if (match_option(option, system_assertion_options, &tail, false)) {
2865 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2866 JavaAssertions::setSystemClassDefault(enable);
2867 // -bootclasspath:
2868 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2869 jio_fprintf(defaultStream::output_stream(),
2870 "-Xbootclasspath is no longer a supported option.\n");
2871 return JNI_EINVAL;
2872 // -bootclasspath/a:
2873 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2874 Arguments::append_sysclasspath(tail);
2875 // -bootclasspath/p:
2876 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2877 jio_fprintf(defaultStream::output_stream(),
2878 "-Xbootclasspath/p is no longer a supported option.\n");
2879 return JNI_EINVAL;
2880 // -Xrun
2881 } else if (match_option(option, "-Xrun", &tail)) {
2882 if (tail != NULL) {
2883 const char* pos = strchr(tail, ':');
2884 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2885 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2886 jio_snprintf(name, len + 1, "%s", tail);
2887
2888 char *options = NULL;
2889 if(pos != NULL) {
2890 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2891 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2892 }
2893 #if !INCLUDE_JVMTI
2894 if (strcmp(name, "jdwp") == 0) {
2895 jio_fprintf(defaultStream::error_stream(),
2896 "Debugging agents are not supported in this VM\n");
2897 return JNI_ERR;
2898 }
2899 #endif // !INCLUDE_JVMTI
2900 add_init_library(name, options);
2901 }
2902 } else if (match_option(option, "--add-reads=", &tail)) {
2903 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2904 return JNI_ENOMEM;
2905 }
2906 } else if (match_option(option, "--add-exports=", &tail)) {
2907 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2908 return JNI_ENOMEM;
2909 }
2910 } else if (match_option(option, "--add-opens=", &tail)) {
2911 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2912 return JNI_ENOMEM;
2913 }
2914 } else if (match_option(option, "--add-modules=", &tail)) {
2915 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2916 return JNI_ENOMEM;
2917 }
2918 } else if (match_option(option, "--limit-modules=", &tail)) {
2919 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2920 return JNI_ENOMEM;
2921 }
2922 } else if (match_option(option, "--module-path=", &tail)) {
2923 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2924 return JNI_ENOMEM;
2925 }
2926 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2927 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2928 return JNI_ENOMEM;
2929 }
2930 } else if (match_option(option, "--patch-module=", &tail)) {
2931 // --patch-module=<module>=<file>(<pathsep><file>)*
2932 int res = process_patch_mod_option(tail, patch_mod_javabase);
2933 if (res != JNI_OK) {
2934 return res;
2935 }
2936 } else if (match_option(option, "--permit-illegal-access")) {
2937 if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) {
2938 return JNI_ENOMEM;
2939 }
2940 // -agentlib and -agentpath
2941 } else if (match_option(option, "-agentlib:", &tail) ||
2942 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2943 if(tail != NULL) {
2944 const char* pos = strchr(tail, '=');
2945 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2946 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2947 name[len] = '\0';
2948
2949 char *options = NULL;
2950 if(pos != NULL) {
2951 options = os::strdup_check_oom(pos + 1, mtArguments);
2952 }
2953 #if !INCLUDE_JVMTI
2954 if (valid_jdwp_agent(name, is_absolute_path)) {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "Debugging agents are not supported in this VM\n");
2957 return JNI_ERR;
2958 }
2959 #endif // !INCLUDE_JVMTI
2960 add_init_agent(name, options, is_absolute_path);
2961 }
2962 // -javaagent
2963 } else if (match_option(option, "-javaagent:", &tail)) {
2964 #if !INCLUDE_JVMTI
2965 jio_fprintf(defaultStream::error_stream(),
2966 "Instrumentation agents are not supported in this VM\n");
2967 return JNI_ERR;
2968 #else
2969 if (tail != NULL) {
2970 size_t length = strlen(tail) + 1;
2971 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2972 jio_snprintf(options, length, "%s", tail);
2973 add_init_agent("instrument", options, false);
2974 // java agents need module java.instrument
2975 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2976 return JNI_ENOMEM;
2977 }
2978 }
2979 #endif // !INCLUDE_JVMTI
2980 // -Xnoclassgc
2981 } else if (match_option(option, "-Xnoclassgc")) {
2982 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2983 return JNI_EINVAL;
2984 }
2985 // -Xconcgc
2986 } else if (match_option(option, "-Xconcgc")) {
2987 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2991 // -Xnoconcgc
2992 } else if (match_option(option, "-Xnoconcgc")) {
2993 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2997 // -Xbatch
2998 } else if (match_option(option, "-Xbatch")) {
2999 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3000 return JNI_EINVAL;
3001 }
3002 // -Xmn for compatibility with other JVM vendors
3003 } else if (match_option(option, "-Xmn", &tail)) {
3004 julong long_initial_young_size = 0;
3005 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3006 if (errcode != arg_in_range) {
3007 jio_fprintf(defaultStream::error_stream(),
3008 "Invalid initial young generation size: %s\n", option->optionString);
3009 describe_range_error(errcode);
3010 return JNI_EINVAL;
3011 }
3012 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 // -Xms
3019 } else if (match_option(option, "-Xms", &tail)) {
3020 julong long_initial_heap_size = 0;
3021 // an initial heap size of 0 means automatically determine
3022 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3023 if (errcode != arg_in_range) {
3024 jio_fprintf(defaultStream::error_stream(),
3025 "Invalid initial heap size: %s\n", option->optionString);
3026 describe_range_error(errcode);
3027 return JNI_EINVAL;
3028 }
3029 set_min_heap_size((size_t)long_initial_heap_size);
3030 // Currently the minimum size and the initial heap sizes are the same.
3031 // Can be overridden with -XX:InitialHeapSize.
3032 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 // -Xmx
3036 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3037 julong long_max_heap_size = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid maximum heap size: %s\n", option->optionString);
3042 describe_range_error(errcode);
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 // Xmaxf
3049 } else if (match_option(option, "-Xmaxf", &tail)) {
3050 char* err;
3051 int maxf = (int)(strtod(tail, &err) * 100);
3052 if (*err != '\0' || *tail == '\0') {
3053 jio_fprintf(defaultStream::error_stream(),
3054 "Bad max heap free percentage size: %s\n",
3055 option->optionString);
3056 return JNI_EINVAL;
3057 } else {
3058 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 }
3062 // Xminf
3063 } else if (match_option(option, "-Xminf", &tail)) {
3064 char* err;
3065 int minf = (int)(strtod(tail, &err) * 100);
3066 if (*err != '\0' || *tail == '\0') {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "Bad min heap free percentage size: %s\n",
3069 option->optionString);
3070 return JNI_EINVAL;
3071 } else {
3072 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3073 return JNI_EINVAL;
3074 }
3075 }
3076 // -Xss
3077 } else if (match_option(option, "-Xss", &tail)) {
3078 julong long_ThreadStackSize = 0;
3079 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3080 if (errcode != arg_in_range) {
3081 jio_fprintf(defaultStream::error_stream(),
3082 "Invalid thread stack size: %s\n", option->optionString);
3083 describe_range_error(errcode);
3084 return JNI_EINVAL;
3085 }
3086 // Internally track ThreadStackSize in units of 1024 bytes.
3087 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3088 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3092 } else if (match_option(option, "-Xoss", &tail) ||
3093 match_option(option, "-Xsqnopause") ||
3094 match_option(option, "-Xoptimize") ||
3095 match_option(option, "-Xboundthreads") ||
3096 match_option(option, "-Xusealtsigs")) {
3097 // All these options are deprecated in JDK 9 and will be removed in a future release
3098 char version[256];
3099 JDK_Version::jdk(9).to_string(version, sizeof(version));
3100 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3101 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3102 julong long_CodeCacheExpansionSize = 0;
3103 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3104 if (errcode != arg_in_range) {
3105 jio_fprintf(defaultStream::error_stream(),
3106 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3107 os::vm_page_size()/K);
3108 return JNI_EINVAL;
3109 }
3110 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3114 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3115 julong long_ReservedCodeCacheSize = 0;
3116
3117 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3118 if (errcode != arg_in_range) {
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Invalid maximum code cache size: %s.\n", option->optionString);
3121 return JNI_EINVAL;
3122 }
3123 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3124 return JNI_EINVAL;
3125 }
3126 // -XX:NonNMethodCodeHeapSize=
3127 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3128 julong long_NonNMethodCodeHeapSize = 0;
3129
3130 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3131 if (errcode != arg_in_range) {
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3134 return JNI_EINVAL;
3135 }
3136 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 // -XX:ProfiledCodeHeapSize=
3140 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3141 julong long_ProfiledCodeHeapSize = 0;
3142
3143 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3144 if (errcode != arg_in_range) {
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 // -XX:NonProfiledCodeHeapSizee=
3153 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3154 julong long_NonProfiledCodeHeapSize = 0;
3155
3156 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3157 if (errcode != arg_in_range) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3160 return JNI_EINVAL;
3161 }
3162 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 // -green
3166 } else if (match_option(option, "-green")) {
3167 jio_fprintf(defaultStream::error_stream(),
3168 "Green threads support not available\n");
3169 return JNI_EINVAL;
3170 // -native
3171 } else if (match_option(option, "-native")) {
3172 // HotSpot always uses native threads, ignore silently for compatibility
3173 // -Xrs
3174 } else if (match_option(option, "-Xrs")) {
3175 // Classic/EVM option, new functionality
3176 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 // -Xprof
3180 } else if (match_option(option, "-Xprof")) {
3181 #if INCLUDE_FPROF
3182 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3183 _has_profile = true;
3184 #else // INCLUDE_FPROF
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Flat profiling is not supported in this VM.\n");
3187 return JNI_ERR;
3188 #endif // INCLUDE_FPROF
3189 // -Xconcurrentio
3190 } else if (match_option(option, "-Xconcurrentio")) {
3191 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3204 return JNI_EINVAL;
3205 }
3206
3207 // -Xinternalversion
3208 } else if (match_option(option, "-Xinternalversion")) {
3209 jio_fprintf(defaultStream::output_stream(), "%s\n",
3210 VM_Version::internal_vm_info_string());
3211 vm_exit(0);
3212 #ifndef PRODUCT
3213 // -Xprintflags
3214 } else if (match_option(option, "-Xprintflags")) {
3215 CommandLineFlags::printFlags(tty, false);
3216 vm_exit(0);
3217 #endif
3218 // -D
3219 } else if (match_option(option, "-D", &tail)) {
3220 const char* value;
3221 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3222 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3223 // abort if -Djava.endorsed.dirs is set
3224 jio_fprintf(defaultStream::output_stream(),
3225 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3226 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3227 return JNI_EINVAL;
3228 }
3229 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3230 *value != '\0' && strcmp(value, "\"\"") != 0) {
3231 // abort if -Djava.ext.dirs is set
3232 jio_fprintf(defaultStream::output_stream(),
3233 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3234 return JNI_EINVAL;
3235 }
3236 // Check for module related properties. They must be set using the modules
3237 // options. For example: use "--add-modules=java.sql", not
3238 // "-Djdk.module.addmods=java.sql"
3239 if (is_internal_module_property(option->optionString + 2)) {
3240 needs_module_property_warning = true;
3241 continue;
3242 }
3243
3244 if (!add_property(tail)) {
3245 return JNI_ENOMEM;
3246 }
3247 // Out of the box management support
3248 if (match_option(option, "-Dcom.sun.management", &tail)) {
3249 #if INCLUDE_MANAGEMENT
3250 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3251 return JNI_EINVAL;
3252 }
3253 // management agent in module jdk.management.agent
3254 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3255 return JNI_ENOMEM;
3256 }
3257 #else
3258 jio_fprintf(defaultStream::output_stream(),
3259 "-Dcom.sun.management is not supported in this VM.\n");
3260 return JNI_ERR;
3261 #endif
3262 }
3263 // -Xint
3264 } else if (match_option(option, "-Xint")) {
3265 set_mode_flags(_int);
3266 // -Xmixed
3267 } else if (match_option(option, "-Xmixed")) {
3268 set_mode_flags(_mixed);
3269 // -Xcomp
3270 } else if (match_option(option, "-Xcomp")) {
3271 // for testing the compiler; turn off all flags that inhibit compilation
3272 set_mode_flags(_comp);
3273 // -Xshare:dump
3274 } else if (match_option(option, "-Xshare:dump")) {
3275 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3276 return JNI_EINVAL;
3277 }
3278 set_mode_flags(_int); // Prevent compilation, which creates objects
3279 // -Xshare:on
3280 } else if (match_option(option, "-Xshare:on")) {
3281 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3282 return JNI_EINVAL;
3283 }
3284 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3285 return JNI_EINVAL;
3286 }
3287 // -Xshare:auto
3288 } else if (match_option(option, "-Xshare:auto")) {
3289 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 // -Xshare:off
3296 } else if (match_option(option, "-Xshare:off")) {
3297 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3298 return JNI_EINVAL;
3299 }
3300 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 // -Xverify
3304 } else if (match_option(option, "-Xverify", &tail)) {
3305 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3306 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3310 return JNI_EINVAL;
3311 }
3312 } else if (strcmp(tail, ":remote") == 0) {
3313 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3314 return JNI_EINVAL;
3315 }
3316 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3317 return JNI_EINVAL;
3318 }
3319 } else if (strcmp(tail, ":none") == 0) {
3320 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3321 return JNI_EINVAL;
3322 }
3323 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3324 return JNI_EINVAL;
3325 }
3326 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3327 return JNI_EINVAL;
3328 }
3329 // -Xdebug
3330 } else if (match_option(option, "-Xdebug")) {
3331 // note this flag has been used, then ignore
3332 set_xdebug_mode(true);
3333 // -Xnoagent
3334 } else if (match_option(option, "-Xnoagent")) {
3335 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3336 } else if (match_option(option, "-Xloggc:", &tail)) {
3337 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3338 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3339 _gc_log_filename = os::strdup_check_oom(tail);
3340 } else if (match_option(option, "-Xlog", &tail)) {
3341 bool ret = false;
3342 if (strcmp(tail, ":help") == 0) {
3343 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3344 vm_exit(0);
3345 } else if (strcmp(tail, ":disable") == 0) {
3346 LogConfiguration::disable_logging();
3347 ret = true;
3348 } else if (*tail == '\0') {
3349 ret = LogConfiguration::parse_command_line_arguments();
3350 assert(ret, "-Xlog without arguments should never fail to parse");
3351 } else if (*tail == ':') {
3352 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3353 }
3354 if (ret == false) {
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Invalid -Xlog option '-Xlog%s'\n",
3357 tail);
3358 return JNI_EINVAL;
3359 }
3360 // JNI hooks
3361 } else if (match_option(option, "-Xcheck", &tail)) {
3362 if (!strcmp(tail, ":jni")) {
3363 #if !INCLUDE_JNI_CHECK
3364 warning("JNI CHECKING is not supported in this VM");
3365 #else
3366 CheckJNICalls = true;
3367 #endif // INCLUDE_JNI_CHECK
3368 } else if (is_bad_option(option, args->ignoreUnrecognized,
3369 "check")) {
3370 return JNI_EINVAL;
3371 }
3372 } else if (match_option(option, "vfprintf")) {
3373 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3374 } else if (match_option(option, "exit")) {
3375 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3376 } else if (match_option(option, "abort")) {
3377 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3378 // -XX:+AggressiveHeap
3379 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3380 jint result = set_aggressive_heap_flags();
3381 if (result != JNI_OK) {
3382 return result;
3383 }
3384 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3385 // and the last option wins.
3386 } else if (match_option(option, "-XX:+NeverTenure")) {
3387 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3388 return JNI_EINVAL;
3389 }
3390 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3391 return JNI_EINVAL;
3392 }
3393 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3394 return JNI_EINVAL;
3395 }
3396 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3397 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3398 return JNI_EINVAL;
3399 }
3400 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3401 return JNI_EINVAL;
3402 }
3403 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3404 return JNI_EINVAL;
3405 }
3406 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3407 uintx max_tenuring_thresh = 0;
3408 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3409 jio_fprintf(defaultStream::error_stream(),
3410 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3411 return JNI_EINVAL;
3412 }
3413
3414 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3415 return JNI_EINVAL;
3416 }
3417
3418 if (MaxTenuringThreshold == 0) {
3419 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3420 return JNI_EINVAL;
3421 }
3422 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3423 return JNI_EINVAL;
3424 }
3425 } else {
3426 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3427 return JNI_EINVAL;
3428 }
3429 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3430 return JNI_EINVAL;
3431 }
3432 }
3433 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3434 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3435 return JNI_EINVAL;
3436 }
3437 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3438 return JNI_EINVAL;
3439 }
3440 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3441 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3442 return JNI_EINVAL;
3443 }
3444 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3445 return JNI_EINVAL;
3446 }
3447 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3448 #if defined(DTRACE_ENABLED)
3449 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3450 return JNI_EINVAL;
3451 }
3452 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3453 return JNI_EINVAL;
3454 }
3455 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3456 return JNI_EINVAL;
3457 }
3458 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3459 return JNI_EINVAL;
3460 }
3461 #else // defined(DTRACE_ENABLED)
3462 jio_fprintf(defaultStream::error_stream(),
3463 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3464 return JNI_EINVAL;
3465 #endif // defined(DTRACE_ENABLED)
3466 #ifdef ASSERT
3467 } else if (match_option(option, "-XX:+FullGCALot")) {
3468 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3469 return JNI_EINVAL;
3470 }
3471 // disable scavenge before parallel mark-compact
3472 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3473 return JNI_EINVAL;
3474 }
3475 #endif
3476 #if !INCLUDE_MANAGEMENT
3477 } else if (match_option(option, "-XX:+ManagementServer")) {
3478 jio_fprintf(defaultStream::error_stream(),
3479 "ManagementServer is not supported in this VM.\n");
3480 return JNI_ERR;
3481 #endif // INCLUDE_MANAGEMENT
3482 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3483 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3484 // already been handled
3485 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3486 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3487 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3488 return JNI_EINVAL;
3489 }
3490 }
3491 // Unknown option
3492 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3493 return JNI_ERR;
3494 }
3495 }
3496
3497 // PrintSharedArchiveAndExit will turn on
3498 // -Xshare:on
3499 // -Xlog:class+path=info
3500 if (PrintSharedArchiveAndExit) {
3501 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3502 return JNI_EINVAL;
3503 }
3504 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3505 return JNI_EINVAL;
3506 }
3507 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3508 }
3509
3510 // Change the default value for flags which have different default values
3511 // when working with older JDKs.
3512 #ifdef LINUX
3513 if (JDK_Version::current().compare_major(6) <= 0 &&
3514 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3515 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3516 }
3517 #endif // LINUX
3518 fix_appclasspath();
3519 return JNI_OK;
3520 }
3521
3522 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3523 // For java.base check for duplicate --patch-module options being specified on the command line.
3524 // This check is only required for java.base, all other duplicate module specifications
3525 // will be checked during module system initialization. The module system initialization
3526 // will throw an ExceptionInInitializerError if this situation occurs.
3527 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3528 if (*patch_mod_javabase) {
3529 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3530 } else {
3531 *patch_mod_javabase = true;
3532 }
3533 }
3534
3535 // Create GrowableArray lazily, only if --patch-module has been specified
3536 if (_patch_mod_prefix == NULL) {
3537 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3538 }
3539
3540 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3541 }
3542
3543 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3544 //
3545 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3546 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3547 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3548 // path is treated as the current directory.
3549 //
3550 // This causes problems with CDS, which requires that all directories specified in the classpath
3551 // must be empty. In most cases, applications do NOT want to load classes from the current
3552 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3553 // scripts compatible with CDS.
3554 void Arguments::fix_appclasspath() {
3555 if (IgnoreEmptyClassPaths) {
3556 const char separator = *os::path_separator();
3557 const char* src = _java_class_path->value();
3558
3559 // skip over all the leading empty paths
3560 while (*src == separator) {
3561 src ++;
3562 }
3563
3564 char* copy = os::strdup_check_oom(src, mtArguments);
3565
3566 // trim all trailing empty paths
3567 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3568 *tail = '\0';
3569 }
3570
3571 char from[3] = {separator, separator, '\0'};
3572 char to [2] = {separator, '\0'};
3573 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3574 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3575 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3576 }
3577
3578 _java_class_path->set_writeable_value(copy);
3579 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3580 }
3581 }
3582
3583 static bool has_jar_files(const char* directory) {
3584 DIR* dir = os::opendir(directory);
3585 if (dir == NULL) return false;
3586
3587 struct dirent *entry;
3588 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3589 bool hasJarFile = false;
3590 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3591 const char* name = entry->d_name;
3592 const char* ext = name + strlen(name) - 4;
3593 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3594 }
3595 FREE_C_HEAP_ARRAY(char, dbuf);
3596 os::closedir(dir);
3597 return hasJarFile ;
3598 }
3599
3600 static int check_non_empty_dirs(const char* path) {
3601 const char separator = *os::path_separator();
3602 const char* const end = path + strlen(path);
3603 int nonEmptyDirs = 0;
3604 while (path < end) {
3605 const char* tmp_end = strchr(path, separator);
3606 if (tmp_end == NULL) {
3607 if (has_jar_files(path)) {
3608 nonEmptyDirs++;
3609 jio_fprintf(defaultStream::output_stream(),
3610 "Non-empty directory: %s\n", path);
3611 }
3612 path = end;
3613 } else {
3614 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3615 memcpy(dirpath, path, tmp_end - path);
3616 dirpath[tmp_end - path] = '\0';
3617 if (has_jar_files(dirpath)) {
3618 nonEmptyDirs++;
3619 jio_fprintf(defaultStream::output_stream(),
3620 "Non-empty directory: %s\n", dirpath);
3621 }
3622 FREE_C_HEAP_ARRAY(char, dirpath);
3623 path = tmp_end + 1;
3624 }
3625 }
3626 return nonEmptyDirs;
3627 }
3628
3629 jint Arguments::finalize_vm_init_args() {
3630 // check if the default lib/endorsed directory exists; if so, error
3631 char path[JVM_MAXPATHLEN];
3632 const char* fileSep = os::file_separator();
3633 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3634
3635 if (CheckEndorsedAndExtDirs) {
3636 int nonEmptyDirs = 0;
3637 // check endorsed directory
3638 nonEmptyDirs += check_non_empty_dirs(path);
3639 // check the extension directories
3640 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3641 if (nonEmptyDirs > 0) {
3642 return JNI_ERR;
3643 }
3644 }
3645
3646 DIR* dir = os::opendir(path);
3647 if (dir != NULL) {
3648 jio_fprintf(defaultStream::output_stream(),
3649 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3650 "in modular form will be supported via the concept of upgradeable modules.\n");
3651 os::closedir(dir);
3652 return JNI_ERR;
3653 }
3654
3655 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3656 dir = os::opendir(path);
3657 if (dir != NULL) {
3658 jio_fprintf(defaultStream::output_stream(),
3659 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3660 "Use -classpath instead.\n.");
3661 os::closedir(dir);
3662 return JNI_ERR;
3663 }
3664
3665 // This must be done after all arguments have been processed.
3666 // java_compiler() true means set to "NONE" or empty.
3667 if (java_compiler() && !xdebug_mode()) {
3668 // For backwards compatibility, we switch to interpreted mode if
3669 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3670 // not specified.
3671 set_mode_flags(_int);
3672 }
3673
3674 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3675 // but like -Xint, leave compilation thresholds unaffected.
3676 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3677 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3678 set_mode_flags(_int);
3679 }
3680
3681 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3682 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3683 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3684 }
3685
3686 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3687 // Don't degrade server performance for footprint
3688 if (FLAG_IS_DEFAULT(UseLargePages) &&
3689 MaxHeapSize < LargePageHeapSizeThreshold) {
3690 // No need for large granularity pages w/small heaps.
3691 // Note that large pages are enabled/disabled for both the
3692 // Java heap and the code cache.
3693 FLAG_SET_DEFAULT(UseLargePages, false);
3694 }
3695
3696 #elif defined(COMPILER2)
3697 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3698 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3699 }
3700 #endif
3701
3702 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3703 UNSUPPORTED_OPTION(ProfileInterpreter);
3704 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3705 #endif
3706
3707 #ifndef TIERED
3708 // Tiered compilation is undefined.
3709 UNSUPPORTED_OPTION(TieredCompilation);
3710 #endif
3711
3712 #if INCLUDE_JVMCI
3713 if (EnableJVMCI &&
3714 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3715 return JNI_ENOMEM;
3716 }
3717 #endif
3718
3719 // If we are running in a headless jre, force java.awt.headless property
3720 // to be true unless the property has already been set.
3721 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3722 if (os::is_headless_jre()) {
3723 const char* headless = Arguments::get_property("java.awt.headless");
3724 if (headless == NULL) {
3725 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3726 if (headless_env == NULL) {
3727 if (!add_property("java.awt.headless=true")) {
3728 return JNI_ENOMEM;
3729 }
3730 } else {
3731 char buffer[256];
3732 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3733 if (!add_property(buffer)) {
3734 return JNI_ENOMEM;
3735 }
3736 }
3737 }
3738 }
3739
3740 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3741 // CMS can only be used with ParNew
3742 FLAG_SET_ERGO(bool, UseParNewGC, true);
3743 }
3744
3745 if (!check_vm_args_consistency()) {
3746 return JNI_ERR;
3747 }
3748
3749 #if INCLUDE_JVMCI
3750 if (UseJVMCICompiler) {
3751 Compilation_mode = CompMode_server;
3752 }
3753 #endif
3754
3755 return JNI_OK;
3756 }
3757
3758 // Helper class for controlling the lifetime of JavaVMInitArgs
3759 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3760 // deleted on the destruction of the ScopedVMInitArgs object.
3761 class ScopedVMInitArgs : public StackObj {
3762 private:
3763 JavaVMInitArgs _args;
3764 char* _container_name;
3765 bool _is_set;
3766 char* _vm_options_file_arg;
3767
3768 public:
3769 ScopedVMInitArgs(const char *container_name) {
3770 _args.version = JNI_VERSION_1_2;
3771 _args.nOptions = 0;
3772 _args.options = NULL;
3773 _args.ignoreUnrecognized = false;
3774 _container_name = (char *)container_name;
3775 _is_set = false;
3776 _vm_options_file_arg = NULL;
3777 }
3778
3779 // Populates the JavaVMInitArgs object represented by this
3780 // ScopedVMInitArgs object with the arguments in options. The
3781 // allocated memory is deleted by the destructor. If this method
3782 // returns anything other than JNI_OK, then this object is in a
3783 // partially constructed state, and should be abandoned.
3784 jint set_args(GrowableArray<JavaVMOption>* options) {
3785 _is_set = true;
3786 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3787 JavaVMOption, options->length(), mtArguments);
3788 if (options_arr == NULL) {
3789 return JNI_ENOMEM;
3790 }
3791 _args.options = options_arr;
3792
3793 for (int i = 0; i < options->length(); i++) {
3794 options_arr[i] = options->at(i);
3795 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3796 if (options_arr[i].optionString == NULL) {
3797 // Rely on the destructor to do cleanup.
3798 _args.nOptions = i;
3799 return JNI_ENOMEM;
3800 }
3801 }
3802
3803 _args.nOptions = options->length();
3804 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3805 return JNI_OK;
3806 }
3807
3808 JavaVMInitArgs* get() { return &_args; }
3809 char* container_name() { return _container_name; }
3810 bool is_set() { return _is_set; }
3811 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3812 char* vm_options_file_arg() { return _vm_options_file_arg; }
3813
3814 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3815 if (_vm_options_file_arg != NULL) {
3816 os::free(_vm_options_file_arg);
3817 }
3818 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3819 }
3820
3821 ~ScopedVMInitArgs() {
3822 if (_vm_options_file_arg != NULL) {
3823 os::free(_vm_options_file_arg);
3824 }
3825 if (_args.options == NULL) return;
3826 for (int i = 0; i < _args.nOptions; i++) {
3827 os::free(_args.options[i].optionString);
3828 }
3829 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3830 }
3831
3832 // Insert options into this option list, to replace option at
3833 // vm_options_file_pos (-XX:VMOptionsFile)
3834 jint insert(const JavaVMInitArgs* args,
3835 const JavaVMInitArgs* args_to_insert,
3836 const int vm_options_file_pos) {
3837 assert(_args.options == NULL, "shouldn't be set yet");
3838 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3839 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3840
3841 int length = args->nOptions + args_to_insert->nOptions - 1;
3842 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3843 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3844 for (int i = 0; i < args->nOptions; i++) {
3845 if (i == vm_options_file_pos) {
3846 // insert the new options starting at the same place as the
3847 // -XX:VMOptionsFile option
3848 for (int j = 0; j < args_to_insert->nOptions; j++) {
3849 options->push(args_to_insert->options[j]);
3850 }
3851 } else {
3852 options->push(args->options[i]);
3853 }
3854 }
3855 // make into options array
3856 jint result = set_args(options);
3857 delete options;
3858 return result;
3859 }
3860 };
3861
3862 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3863 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3864 }
3865
3866 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3867 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3868 }
3869
3870 jint Arguments::parse_options_environment_variable(const char* name,
3871 ScopedVMInitArgs* vm_args) {
3872 char *buffer = ::getenv(name);
3873
3874 // Don't check this environment variable if user has special privileges
3875 // (e.g. unix su command).
3876 if (buffer == NULL || os::have_special_privileges()) {
3877 return JNI_OK;
3878 }
3879
3880 if ((buffer = os::strdup(buffer)) == NULL) {
3881 return JNI_ENOMEM;
3882 }
3883
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Picked up %s: %s\n", name, buffer);
3886
3887 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3888
3889 os::free(buffer);
3890 return retcode;
3891 }
3892
3893 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3894 // read file into buffer
3895 int fd = ::open(file_name, O_RDONLY);
3896 if (fd < 0) {
3897 jio_fprintf(defaultStream::error_stream(),
3898 "Could not open options file '%s'\n",
3899 file_name);
3900 return JNI_ERR;
3901 }
3902
3903 struct stat stbuf;
3904 int retcode = os::stat(file_name, &stbuf);
3905 if (retcode != 0) {
3906 jio_fprintf(defaultStream::error_stream(),
3907 "Could not stat options file '%s'\n",
3908 file_name);
3909 os::close(fd);
3910 return JNI_ERR;
3911 }
3912
3913 if (stbuf.st_size == 0) {
3914 // tell caller there is no option data and that is ok
3915 os::close(fd);
3916 return JNI_OK;
3917 }
3918
3919 // '+ 1' for NULL termination even with max bytes
3920 size_t bytes_alloc = stbuf.st_size + 1;
3921
3922 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3923 if (NULL == buf) {
3924 jio_fprintf(defaultStream::error_stream(),
3925 "Could not allocate read buffer for options file parse\n");
3926 os::close(fd);
3927 return JNI_ENOMEM;
3928 }
3929
3930 memset(buf, 0, bytes_alloc);
3931
3932 // Fill buffer
3933 // Use ::read() instead of os::read because os::read()
3934 // might do a thread state transition
3935 // and it is too early for that here
3936
3937 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3938 os::close(fd);
3939 if (bytes_read < 0) {
3940 FREE_C_HEAP_ARRAY(char, buf);
3941 jio_fprintf(defaultStream::error_stream(),
3942 "Could not read options file '%s'\n", file_name);
3943 return JNI_ERR;
3944 }
3945
3946 if (bytes_read == 0) {
3947 // tell caller there is no option data and that is ok
3948 FREE_C_HEAP_ARRAY(char, buf);
3949 return JNI_OK;
3950 }
3951
3952 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3953
3954 FREE_C_HEAP_ARRAY(char, buf);
3955 return retcode;
3956 }
3957
3958 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3959 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3960
3961 // some pointers to help with parsing
3962 char *buffer_end = buffer + buf_len;
3963 char *opt_hd = buffer;
3964 char *wrt = buffer;
3965 char *rd = buffer;
3966
3967 // parse all options
3968 while (rd < buffer_end) {
3969 // skip leading white space from the input string
3970 while (rd < buffer_end && isspace(*rd)) {
3971 rd++;
3972 }
3973
3974 if (rd >= buffer_end) {
3975 break;
3976 }
3977
3978 // Remember this is where we found the head of the token.
3979 opt_hd = wrt;
3980
3981 // Tokens are strings of non white space characters separated
3982 // by one or more white spaces.
3983 while (rd < buffer_end && !isspace(*rd)) {
3984 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3985 int quote = *rd; // matching quote to look for
3986 rd++; // don't copy open quote
3987 while (rd < buffer_end && *rd != quote) {
3988 // include everything (even spaces)
3989 // up until the close quote
3990 *wrt++ = *rd++; // copy to option string
3991 }
3992
3993 if (rd < buffer_end) {
3994 rd++; // don't copy close quote
3995 } else {
3996 // did not see closing quote
3997 jio_fprintf(defaultStream::error_stream(),
3998 "Unmatched quote in %s\n", name);
3999 delete options;
4000 return JNI_ERR;
4001 }
4002 } else {
4003 *wrt++ = *rd++; // copy to option string
4004 }
4005 }
4006
4007 // steal a white space character and set it to NULL
4008 *wrt++ = '\0';
4009 // We now have a complete token
4010
4011 JavaVMOption option;
4012 option.optionString = opt_hd;
4013 option.extraInfo = NULL;
4014
4015 options->append(option); // Fill in option
4016
4017 rd++; // Advance to next character
4018 }
4019
4020 // Fill out JavaVMInitArgs structure.
4021 jint status = vm_args->set_args(options);
4022
4023 delete options;
4024 return status;
4025 }
4026
4027 void Arguments::set_shared_spaces_flags() {
4028 if (DumpSharedSpaces) {
4029 if (FailOverToOldVerifier) {
4030 // Don't fall back to the old verifier on verification failure. If a
4031 // class fails verification with the split verifier, it might fail the
4032 // CDS runtime verifier constraint check. In that case, we don't want
4033 // to share the class. We only archive classes that pass the split verifier.
4034 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4035 }
4036
4037 if (RequireSharedSpaces) {
4038 warning("Cannot dump shared archive while using shared archive");
4039 }
4040 UseSharedSpaces = false;
4041 #ifdef _LP64
4042 if (!UseCompressedOops || !UseCompressedClassPointers) {
4043 vm_exit_during_initialization(
4044 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4045 }
4046 } else {
4047 if (!UseCompressedOops || !UseCompressedClassPointers) {
4048 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4049 }
4050 #endif
4051 }
4052 }
4053
4054 // Sharing support
4055 // Construct the path to the archive
4056 static char* get_shared_archive_path() {
4057 char *shared_archive_path;
4058 if (SharedArchiveFile == NULL) {
4059 char jvm_path[JVM_MAXPATHLEN];
4060 os::jvm_path(jvm_path, sizeof(jvm_path));
4061 char *end = strrchr(jvm_path, *os::file_separator());
4062 if (end != NULL) *end = '\0';
4063 size_t jvm_path_len = strlen(jvm_path);
4064 size_t file_sep_len = strlen(os::file_separator());
4065 const size_t len = jvm_path_len + file_sep_len + 20;
4066 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4067 if (shared_archive_path != NULL) {
4068 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4069 jvm_path, os::file_separator());
4070 }
4071 } else {
4072 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4073 }
4074 return shared_archive_path;
4075 }
4076
4077 #ifndef PRODUCT
4078 // Determine whether LogVMOutput should be implicitly turned on.
4079 static bool use_vm_log() {
4080 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4081 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4082 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4083 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4084 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4085 return true;
4086 }
4087
4088 #ifdef COMPILER1
4089 if (PrintC1Statistics) {
4090 return true;
4091 }
4092 #endif // COMPILER1
4093
4094 #ifdef COMPILER2
4095 if (PrintOptoAssembly || PrintOptoStatistics) {
4096 return true;
4097 }
4098 #endif // COMPILER2
4099
4100 return false;
4101 }
4102
4103 #endif // PRODUCT
4104
4105 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4106 for (int index = 0; index < args->nOptions; index++) {
4107 const JavaVMOption* option = args->options + index;
4108 const char* tail;
4109 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4110 return true;
4111 }
4112 }
4113 return false;
4114 }
4115
4116 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4117 const char* vm_options_file,
4118 const int vm_options_file_pos,
4119 ScopedVMInitArgs* vm_options_file_args,
4120 ScopedVMInitArgs* args_out) {
4121 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4122 if (code != JNI_OK) {
4123 return code;
4124 }
4125
4126 if (vm_options_file_args->get()->nOptions < 1) {
4127 return JNI_OK;
4128 }
4129
4130 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4131 jio_fprintf(defaultStream::error_stream(),
4132 "A VM options file may not refer to a VM options file. "
4133 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4134 "options file '%s' in options container '%s' is an error.\n",
4135 vm_options_file_args->vm_options_file_arg(),
4136 vm_options_file_args->container_name());
4137 return JNI_EINVAL;
4138 }
4139
4140 return args_out->insert(args, vm_options_file_args->get(),
4141 vm_options_file_pos);
4142 }
4143
4144 // Expand -XX:VMOptionsFile found in args_in as needed.
4145 // mod_args and args_out parameters may return values as needed.
4146 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4147 ScopedVMInitArgs* mod_args,
4148 JavaVMInitArgs** args_out) {
4149 jint code = match_special_option_and_act(args_in, mod_args);
4150 if (code != JNI_OK) {
4151 return code;
4152 }
4153
4154 if (mod_args->is_set()) {
4155 // args_in contains -XX:VMOptionsFile and mod_args contains the
4156 // original options from args_in along with the options expanded
4157 // from the VMOptionsFile. Return a short-hand to the caller.
4158 *args_out = mod_args->get();
4159 } else {
4160 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4161 }
4162 return JNI_OK;
4163 }
4164
4165 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4166 ScopedVMInitArgs* args_out) {
4167 // Remaining part of option string
4168 const char* tail;
4169 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4170
4171 for (int index = 0; index < args->nOptions; index++) {
4172 const JavaVMOption* option = args->options + index;
4173 if (ArgumentsExt::process_options(option)) {
4174 continue;
4175 }
4176 if (match_option(option, "-XX:Flags=", &tail)) {
4177 Arguments::set_jvm_flags_file(tail);
4178 continue;
4179 }
4180 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4181 if (vm_options_file_args.found_vm_options_file_arg()) {
4182 jio_fprintf(defaultStream::error_stream(),
4183 "The option '%s' is already specified in the options "
4184 "container '%s' so the specification of '%s' in the "
4185 "same options container is an error.\n",
4186 vm_options_file_args.vm_options_file_arg(),
4187 vm_options_file_args.container_name(),
4188 option->optionString);
4189 return JNI_EINVAL;
4190 }
4191 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4192 // If there's a VMOptionsFile, parse that
4193 jint code = insert_vm_options_file(args, tail, index,
4194 &vm_options_file_args, args_out);
4195 if (code != JNI_OK) {
4196 return code;
4197 }
4198 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4199 if (args_out->is_set()) {
4200 // The VMOptions file inserted some options so switch 'args'
4201 // to the new set of options, and continue processing which
4202 // preserves "last option wins" semantics.
4203 args = args_out->get();
4204 // The first option from the VMOptionsFile replaces the
4205 // current option. So we back track to process the
4206 // replacement option.
4207 index--;
4208 }
4209 continue;
4210 }
4211 if (match_option(option, "-XX:+PrintVMOptions")) {
4212 PrintVMOptions = true;
4213 continue;
4214 }
4215 if (match_option(option, "-XX:-PrintVMOptions")) {
4216 PrintVMOptions = false;
4217 continue;
4218 }
4219 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4220 IgnoreUnrecognizedVMOptions = true;
4221 continue;
4222 }
4223 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4224 IgnoreUnrecognizedVMOptions = false;
4225 continue;
4226 }
4227 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4228 CommandLineFlags::printFlags(tty, false);
4229 vm_exit(0);
4230 }
4231 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4232 #if INCLUDE_NMT
4233 // The launcher did not setup nmt environment variable properly.
4234 if (!MemTracker::check_launcher_nmt_support(tail)) {
4235 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4236 }
4237
4238 // Verify if nmt option is valid.
4239 if (MemTracker::verify_nmt_option()) {
4240 // Late initialization, still in single-threaded mode.
4241 if (MemTracker::tracking_level() >= NMT_summary) {
4242 MemTracker::init();
4243 }
4244 } else {
4245 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4246 }
4247 continue;
4248 #else
4249 jio_fprintf(defaultStream::error_stream(),
4250 "Native Memory Tracking is not supported in this VM\n");
4251 return JNI_ERR;
4252 #endif
4253 }
4254
4255 #ifndef PRODUCT
4256 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4257 CommandLineFlags::printFlags(tty, true);
4258 vm_exit(0);
4259 }
4260 #endif
4261 }
4262 return JNI_OK;
4263 }
4264
4265 static void print_options(const JavaVMInitArgs *args) {
4266 const char* tail;
4267 for (int index = 0; index < args->nOptions; index++) {
4268 const JavaVMOption *option = args->options + index;
4269 if (match_option(option, "-XX:", &tail)) {
4270 logOption(tail);
4271 }
4272 }
4273 }
4274
4275 bool Arguments::handle_deprecated_print_gc_flags() {
4276 if (PrintGC) {
4277 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4278 }
4279 if (PrintGCDetails) {
4280 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4281 }
4282
4283 if (_gc_log_filename != NULL) {
4284 // -Xloggc was used to specify a filename
4285 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4286
4287 LogTarget(Error, logging) target;
4288 LogStreamCHeap errstream(target);
4289 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4290 } else if (PrintGC || PrintGCDetails) {
4291 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4292 }
4293 return true;
4294 }
4295
4296 void Arguments::handle_extra_cms_flags(const char* msg) {
4297 SpecialFlag flag;
4298 const char *flag_name = "UseConcMarkSweepGC";
4299 if (lookup_special_flag(flag_name, flag)) {
4300 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4301 warning("%s", msg);
4302 }
4303 }
4304
4305 // Parse entry point called from JNI_CreateJavaVM
4306
4307 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4308 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4309
4310 // Initialize ranges, constraints and writeables
4311 CommandLineFlagRangeList::init();
4312 CommandLineFlagConstraintList::init();
4313 CommandLineFlagWriteableList::init();
4314
4315 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4316 const char* hotspotrc = ".hotspotrc";
4317 bool settings_file_specified = false;
4318 bool needs_hotspotrc_warning = false;
4319 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4320 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4321
4322 // Pointers to current working set of containers
4323 JavaVMInitArgs* cur_cmd_args;
4324 JavaVMInitArgs* cur_java_options_args;
4325 JavaVMInitArgs* cur_java_tool_options_args;
4326
4327 // Containers for modified/expanded options
4328 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4329 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4330 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4331
4332
4333 jint code =
4334 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4335 if (code != JNI_OK) {
4336 return code;
4337 }
4338
4339 code = parse_java_options_environment_variable(&initial_java_options_args);
4340 if (code != JNI_OK) {
4341 return code;
4342 }
4343
4344 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4345 &mod_java_tool_options_args,
4346 &cur_java_tool_options_args);
4347 if (code != JNI_OK) {
4348 return code;
4349 }
4350
4351 code = expand_vm_options_as_needed(initial_cmd_args,
4352 &mod_cmd_args,
4353 &cur_cmd_args);
4354 if (code != JNI_OK) {
4355 return code;
4356 }
4357
4358 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4359 &mod_java_options_args,
4360 &cur_java_options_args);
4361 if (code != JNI_OK) {
4362 return code;
4363 }
4364
4365 const char* flags_file = Arguments::get_jvm_flags_file();
4366 settings_file_specified = (flags_file != NULL);
4367
4368 if (IgnoreUnrecognizedVMOptions) {
4369 cur_cmd_args->ignoreUnrecognized = true;
4370 cur_java_tool_options_args->ignoreUnrecognized = true;
4371 cur_java_options_args->ignoreUnrecognized = true;
4372 }
4373
4374 // Parse specified settings file
4375 if (settings_file_specified) {
4376 if (!process_settings_file(flags_file, true,
4377 cur_cmd_args->ignoreUnrecognized)) {
4378 return JNI_EINVAL;
4379 }
4380 } else {
4381 #ifdef ASSERT
4382 // Parse default .hotspotrc settings file
4383 if (!process_settings_file(".hotspotrc", false,
4384 cur_cmd_args->ignoreUnrecognized)) {
4385 return JNI_EINVAL;
4386 }
4387 #else
4388 struct stat buf;
4389 if (os::stat(hotspotrc, &buf) == 0) {
4390 needs_hotspotrc_warning = true;
4391 }
4392 #endif
4393 }
4394
4395 if (PrintVMOptions) {
4396 print_options(cur_java_tool_options_args);
4397 print_options(cur_cmd_args);
4398 print_options(cur_java_options_args);
4399 }
4400
4401 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4402 jint result = parse_vm_init_args(cur_java_tool_options_args,
4403 cur_java_options_args,
4404 cur_cmd_args);
4405
4406 if (result != JNI_OK) {
4407 return result;
4408 }
4409
4410 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4411 SharedArchivePath = get_shared_archive_path();
4412 if (SharedArchivePath == NULL) {
4413 return JNI_ENOMEM;
4414 }
4415
4416 // Set up VerifySharedSpaces
4417 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4418 VerifySharedSpaces = true;
4419 }
4420
4421 // Delay warning until here so that we've had a chance to process
4422 // the -XX:-PrintWarnings flag
4423 if (needs_hotspotrc_warning) {
4424 warning("%s file is present but has been ignored. "
4425 "Run with -XX:Flags=%s to load the file.",
4426 hotspotrc, hotspotrc);
4427 }
4428
4429 if (needs_module_property_warning) {
4430 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4431 " names that are reserved for internal use.");
4432 }
4433
4434 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4435 UNSUPPORTED_OPTION(UseLargePages);
4436 #endif
4437
4438 ArgumentsExt::report_unsupported_options();
4439
4440 #ifndef PRODUCT
4441 if (TraceBytecodesAt != 0) {
4442 TraceBytecodes = true;
4443 }
4444 if (CountCompiledCalls) {
4445 if (UseCounterDecay) {
4446 warning("UseCounterDecay disabled because CountCalls is set");
4447 UseCounterDecay = false;
4448 }
4449 }
4450 #endif // PRODUCT
4451
4452 if (ScavengeRootsInCode == 0) {
4453 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4454 warning("Forcing ScavengeRootsInCode non-zero");
4455 }
4456 ScavengeRootsInCode = 1;
4457 }
4458
4459 if (!handle_deprecated_print_gc_flags()) {
4460 return JNI_EINVAL;
4461 }
4462
4463 // Set object alignment values.
4464 set_object_alignment();
4465
4466 #if !INCLUDE_CDS
4467 if (DumpSharedSpaces || RequireSharedSpaces) {
4468 jio_fprintf(defaultStream::error_stream(),
4469 "Shared spaces are not supported in this VM\n");
4470 return JNI_ERR;
4471 }
4472 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4473 warning("Shared spaces are not supported in this VM");
4474 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4475 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4476 }
4477 no_shared_spaces("CDS Disabled");
4478 #endif // INCLUDE_CDS
4479
4480 return JNI_OK;
4481 }
4482
4483 jint Arguments::apply_ergo() {
4484 // Set flags based on ergonomics.
4485 set_ergonomics_flags();
4486
4487 #if INCLUDE_JVMCI
4488 set_jvmci_specific_flags();
4489 #endif
4490
4491 set_shared_spaces_flags();
4492
4493 // Check the GC selections again.
4494 if (!check_gc_consistency()) {
4495 return JNI_EINVAL;
4496 }
4497
4498 if (TieredCompilation) {
4499 set_tiered_flags();
4500 } else {
4501 int max_compilation_policy_choice = 1;
4502 #ifdef COMPILER2
4503 if (is_server_compilation_mode_vm()) {
4504 max_compilation_policy_choice = 2;
4505 }
4506 #endif
4507 // Check if the policy is valid.
4508 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4509 vm_exit_during_initialization(
4510 "Incompatible compilation policy selected", NULL);
4511 }
4512 // Scale CompileThreshold
4513 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4514 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4515 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4516 }
4517 }
4518
4519 #ifdef COMPILER2
4520 #ifndef PRODUCT
4521 if (PrintIdealGraphLevel > 0) {
4522 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4523 }
4524 #endif
4525 #endif
4526
4527 // Set heap size based on available physical memory
4528 set_heap_size();
4529
4530 ArgumentsExt::set_gc_specific_flags();
4531
4532 // Initialize Metaspace flags and alignments
4533 Metaspace::ergo_initialize();
4534
4535 // Set bytecode rewriting flags
4536 set_bytecode_flags();
4537
4538 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4539 jint code = set_aggressive_opts_flags();
4540 if (code != JNI_OK) {
4541 return code;
4542 }
4543
4544 // Turn off biased locking for locking debug mode flags,
4545 // which are subtly different from each other but neither works with
4546 // biased locking
4547 if (UseHeavyMonitors
4548 #ifdef COMPILER1
4549 || !UseFastLocking
4550 #endif // COMPILER1
4551 #if INCLUDE_JVMCI
4552 || !JVMCIUseFastLocking
4553 #endif
4554 ) {
4555 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4556 // flag set to true on command line; warn the user that they
4557 // can't enable biased locking here
4558 warning("Biased Locking is not supported with locking debug flags"
4559 "; ignoring UseBiasedLocking flag." );
4560 }
4561 UseBiasedLocking = false;
4562 }
4563
4564 #ifdef CC_INTERP
4565 // Clear flags not supported on zero.
4566 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4567 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4568 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4569 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4570 #endif // CC_INTERP
4571
4572 #ifdef COMPILER2
4573 if (!EliminateLocks) {
4574 EliminateNestedLocks = false;
4575 }
4576 if (!Inline) {
4577 IncrementalInline = false;
4578 }
4579 #ifndef PRODUCT
4580 if (!IncrementalInline) {
4581 AlwaysIncrementalInline = false;
4582 }
4583 #endif
4584 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4585 // nothing to use the profiling, turn if off
4586 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4587 }
4588 #endif
4589
4590 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4591 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4592 DebugNonSafepoints = true;
4593 }
4594
4595 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4596 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4597 }
4598
4599 if (UseOnStackReplacement && !UseLoopCounter) {
4600 warning("On-stack-replacement requires loop counters; enabling loop counters");
4601 FLAG_SET_DEFAULT(UseLoopCounter, true);
4602 }
4603
4604 #ifndef PRODUCT
4605 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4606 if (use_vm_log()) {
4607 LogVMOutput = true;
4608 }
4609 }
4610 #endif // PRODUCT
4611
4612 if (PrintCommandLineFlags) {
4613 CommandLineFlags::printSetFlags(tty);
4614 }
4615
4616 // Apply CPU specific policy for the BiasedLocking
4617 if (UseBiasedLocking) {
4618 if (!VM_Version::use_biased_locking() &&
4619 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4620 UseBiasedLocking = false;
4621 }
4622 }
4623 #ifdef COMPILER2
4624 if (!UseBiasedLocking || EmitSync != 0) {
4625 UseOptoBiasInlining = false;
4626 }
4627 #endif
4628
4629 return JNI_OK;
4630 }
4631
4632 jint Arguments::adjust_after_os() {
4633 if (UseNUMA) {
4634 if (UseParallelGC || UseParallelOldGC) {
4635 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4636 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4637 }
4638 }
4639 // UseNUMAInterleaving is set to ON for all collectors and
4640 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4641 // such as the parallel collector for Linux and Solaris will
4642 // interleave old gen and survivor spaces on top of NUMA
4643 // allocation policy for the eden space.
4644 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4645 // all platforms and ParallelGC on Windows will interleave all
4646 // of the heap spaces across NUMA nodes.
4647 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4648 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4649 }
4650 }
4651 return JNI_OK;
4652 }
4653
4654 int Arguments::PropertyList_count(SystemProperty* pl) {
4655 int count = 0;
4656 while(pl != NULL) {
4657 count++;
4658 pl = pl->next();
4659 }
4660 return count;
4661 }
4662
4663 // Return the number of readable properties.
4664 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4665 int count = 0;
4666 while(pl != NULL) {
4667 if (pl->is_readable()) {
4668 count++;
4669 }
4670 pl = pl->next();
4671 }
4672 return count;
4673 }
4674
4675 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4676 assert(key != NULL, "just checking");
4677 SystemProperty* prop;
4678 for (prop = pl; prop != NULL; prop = prop->next()) {
4679 if (strcmp(key, prop->key()) == 0) return prop->value();
4680 }
4681 return NULL;
4682 }
4683
4684 // Return the value of the requested property provided that it is a readable property.
4685 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4686 assert(key != NULL, "just checking");
4687 SystemProperty* prop;
4688 // Return the property value if the keys match and the property is not internal or
4689 // it's the special internal property "jdk.boot.class.path.append".
4690 for (prop = pl; prop != NULL; prop = prop->next()) {
4691 if (strcmp(key, prop->key()) == 0) {
4692 if (!prop->internal()) {
4693 return prop->value();
4694 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4695 return prop->value();
4696 } else {
4697 // Property is internal and not jdk.boot.class.path.append so return NULL.
4698 return NULL;
4699 }
4700 }
4701 }
4702 return NULL;
4703 }
4704
4705 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4706 int count = 0;
4707 const char* ret_val = NULL;
4708
4709 while(pl != NULL) {
4710 if(count >= index) {
4711 ret_val = pl->key();
4712 break;
4713 }
4714 count++;
4715 pl = pl->next();
4716 }
4717
4718 return ret_val;
4719 }
4720
4721 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4722 int count = 0;
4723 char* ret_val = NULL;
4724
4725 while(pl != NULL) {
4726 if(count >= index) {
4727 ret_val = pl->value();
4728 break;
4729 }
4730 count++;
4731 pl = pl->next();
4732 }
4733
4734 return ret_val;
4735 }
4736
4737 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4738 SystemProperty* p = *plist;
4739 if (p == NULL) {
4740 *plist = new_p;
4741 } else {
4742 while (p->next() != NULL) {
4743 p = p->next();
4744 }
4745 p->set_next(new_p);
4746 }
4747 }
4748
4749 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4750 bool writeable, bool internal) {
4751 if (plist == NULL)
4752 return;
4753
4754 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4755 PropertyList_add(plist, new_p);
4756 }
4757
4758 void Arguments::PropertyList_add(SystemProperty *element) {
4759 PropertyList_add(&_system_properties, element);
4760 }
4761
4762 // This add maintains unique property key in the list.
4763 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4764 PropertyAppendable append, PropertyWriteable writeable,
4765 PropertyInternal internal) {
4766 if (plist == NULL)
4767 return;
4768
4769 // If property key exist then update with new value.
4770 SystemProperty* prop;
4771 for (prop = *plist; prop != NULL; prop = prop->next()) {
4772 if (strcmp(k, prop->key()) == 0) {
4773 if (append == AppendProperty) {
4774 prop->append_value(v);
4775 } else {
4776 prop->set_value(v);
4777 }
4778 return;
4779 }
4780 }
4781
4782 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4783 }
4784
4785 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4786 // Returns true if all of the source pointed by src has been copied over to
4787 // the destination buffer pointed by buf. Otherwise, returns false.
4788 // Notes:
4789 // 1. If the length (buflen) of the destination buffer excluding the
4790 // NULL terminator character is not long enough for holding the expanded
4791 // pid characters, it also returns false instead of returning the partially
4792 // expanded one.
4793 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4794 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4795 char* buf, size_t buflen) {
4796 const char* p = src;
4797 char* b = buf;
4798 const char* src_end = &src[srclen];
4799 char* buf_end = &buf[buflen - 1];
4800
4801 while (p < src_end && b < buf_end) {
4802 if (*p == '%') {
4803 switch (*(++p)) {
4804 case '%': // "%%" ==> "%"
4805 *b++ = *p++;
4806 break;
4807 case 'p': { // "%p" ==> current process id
4808 // buf_end points to the character before the last character so
4809 // that we could write '\0' to the end of the buffer.
4810 size_t buf_sz = buf_end - b + 1;
4811 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4812
4813 // if jio_snprintf fails or the buffer is not long enough to hold
4814 // the expanded pid, returns false.
4815 if (ret < 0 || ret >= (int)buf_sz) {
4816 return false;
4817 } else {
4818 b += ret;
4819 assert(*b == '\0', "fail in copy_expand_pid");
4820 if (p == src_end && b == buf_end + 1) {
4821 // reach the end of the buffer.
4822 return true;
4823 }
4824 }
4825 p++;
4826 break;
4827 }
4828 default :
4829 *b++ = '%';
4830 }
4831 } else {
4832 *b++ = *p++;
4833 }
4834 }
4835 *b = '\0';
4836 return (p == src_end); // return false if not all of the source was copied
4837 }