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
2309 // Encourage steady state memory management
2310 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2311 return JNI_EINVAL;
2312 }
2313
2314 // This appears to improve mutator locality
2315 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2316 return JNI_EINVAL;
2317 }
2318
2319 // Get around early Solaris scheduling bug
2320 // (affinity vs other jobs on system)
2321 // but disallow DR and offlining (5008695).
2322 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2323 return JNI_EINVAL;
2324 }
2325
2326 return JNI_OK;
2327 }
2328
2329 // This must be called after ergonomics.
2330 void Arguments::set_bytecode_flags() {
2331 if (!RewriteBytecodes) {
2332 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2333 }
2334 }
2335
2336 // Aggressive optimization flags -XX:+AggressiveOpts
2337 jint Arguments::set_aggressive_opts_flags() {
2338 #ifdef COMPILER2
2339 if (AggressiveUnboxing) {
2340 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2341 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2342 } else if (!EliminateAutoBox) {
2343 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2344 AggressiveUnboxing = false;
2345 }
2346 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2347 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2348 } else if (!DoEscapeAnalysis) {
2349 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2350 AggressiveUnboxing = false;
2351 }
2352 }
2353 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2354 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2355 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2356 }
2357 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2358 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2359 }
2360
2361 // Feed the cache size setting into the JDK
2362 char buffer[1024];
2363 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2364 if (!add_property(buffer)) {
2365 return JNI_ENOMEM;
2366 }
2367 }
2368 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2369 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2370 }
2371 #endif
2372
2373 if (AggressiveOpts) {
2374 // Sample flag setting code
2375 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2376 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2377 // }
2378 }
2379
2380 return JNI_OK;
2381 }
2382
2383 //===========================================================================================================
2384 // Parsing of java.compiler property
2385
2386 void Arguments::process_java_compiler_argument(const char* arg) {
2387 // For backwards compatibility, Djava.compiler=NONE or ""
2388 // causes us to switch to -Xint mode UNLESS -Xdebug
2389 // is also specified.
2390 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2391 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2392 }
2393 }
2394
2395 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2396 _sun_java_launcher = os::strdup_check_oom(launcher);
2397 }
2398
2399 bool Arguments::created_by_java_launcher() {
2400 assert(_sun_java_launcher != NULL, "property must have value");
2401 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2402 }
2403
2404 bool Arguments::sun_java_launcher_is_altjvm() {
2405 return _sun_java_launcher_is_altjvm;
2406 }
2407
2408 //===========================================================================================================
2409 // Parsing of main arguments
2410
2411 #if INCLUDE_JVMCI
2412 // Check consistency of jvmci vm argument settings.
2413 bool Arguments::check_jvmci_args_consistency() {
2414 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2415 }
2416 #endif //INCLUDE_JVMCI
2417
2418 // Check consistency of GC selection
2419 bool Arguments::check_gc_consistency() {
2420 // Ensure that the user has not selected conflicting sets
2421 // of collectors.
2422 uint i = 0;
2423 if (UseSerialGC) i++;
2424 if (UseConcMarkSweepGC) i++;
2425 if (UseParallelGC || UseParallelOldGC) i++;
2426 if (UseG1GC) i++;
2427 if (i > 1) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Conflicting collector combinations in option list; "
2430 "please refer to the release notes for the combinations "
2431 "allowed\n");
2432 return false;
2433 }
2434
2435 if (UseConcMarkSweepGC && !UseParNewGC) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2438 return false;
2439 }
2440
2441 if (UseParNewGC && !UseConcMarkSweepGC) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2444 return false;
2445 }
2446
2447 return true;
2448 }
2449
2450 // Check the consistency of vm_init_args
2451 bool Arguments::check_vm_args_consistency() {
2452 // Method for adding checks for flag consistency.
2453 // The intent is to warn the user of all possible conflicts,
2454 // before returning an error.
2455 // Note: Needs platform-dependent factoring.
2456 bool status = true;
2457
2458 if (TLABRefillWasteFraction == 0) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "TLABRefillWasteFraction should be a denominator, "
2461 "not " SIZE_FORMAT "\n",
2462 TLABRefillWasteFraction);
2463 status = false;
2464 }
2465
2466 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2467 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2468 }
2469
2470 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2471 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2472 }
2473
2474 if (GCTimeLimit == 100) {
2475 // Turn off gc-overhead-limit-exceeded checks
2476 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2477 }
2478
2479 status = status && check_gc_consistency();
2480
2481 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2482 // insists that we hold the requisite locks so that the iteration is
2483 // MT-safe. For the verification at start-up and shut-down, we don't
2484 // yet have a good way of acquiring and releasing these locks,
2485 // which are not visible at the CollectedHeap level. We want to
2486 // be able to acquire these locks and then do the iteration rather
2487 // than just disable the lock verification. This will be fixed under
2488 // bug 4788986.
2489 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2490 if (VerifyDuringStartup) {
2491 warning("Heap verification at start-up disabled "
2492 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2493 VerifyDuringStartup = false; // Disable verification at start-up
2494 }
2495
2496 if (VerifyBeforeExit) {
2497 warning("Heap verification at shutdown disabled "
2498 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2499 VerifyBeforeExit = false; // Disable verification at shutdown
2500 }
2501 }
2502
2503 if (PrintNMTStatistics) {
2504 #if INCLUDE_NMT
2505 if (MemTracker::tracking_level() == NMT_off) {
2506 #endif // INCLUDE_NMT
2507 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2508 PrintNMTStatistics = false;
2509 #if INCLUDE_NMT
2510 }
2511 #endif
2512 }
2513
2514 #if INCLUDE_JVMCI
2515 status = status && check_jvmci_args_consistency();
2516
2517 if (EnableJVMCI) {
2518 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2519 AddProperty, UnwriteableProperty, InternalProperty);
2520
2521 if (!ScavengeRootsInCode) {
2522 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2523 ScavengeRootsInCode = 1;
2524 }
2525 }
2526 #endif
2527
2528 // Check lower bounds of the code cache
2529 // Template Interpreter code is approximately 3X larger in debug builds.
2530 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2531 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2534 os::vm_page_size()/K);
2535 status = false;
2536 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2539 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2540 status = false;
2541 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2544 min_code_cache_size/K);
2545 status = false;
2546 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2547 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2550 CODE_CACHE_SIZE_LIMIT/M);
2551 status = false;
2552 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2553 jio_fprintf(defaultStream::error_stream(),
2554 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2555 min_code_cache_size/K);
2556 status = false;
2557 }
2558
2559 #ifdef _LP64
2560 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2561 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2562 }
2563 #endif
2564
2565 #ifndef SUPPORT_RESERVED_STACK_AREA
2566 if (StackReservedPages != 0) {
2567 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2568 warning("Reserved Stack Area not supported on this platform");
2569 }
2570 #endif
2571
2572 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2573 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2574 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2575 }
2576 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2577 }
2578 if (UseCompiler && is_interpreter_only()) {
2579 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2580 warning("UseCompiler disabled due to -Xint.");
2581 }
2582 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2583 }
2584 #ifdef COMPILER2
2585 if (PostLoopMultiversioning && !RangeCheckElimination) {
2586 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2587 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2588 }
2589 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2590 }
2591 #endif
2592 return status;
2593 }
2594
2595 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2596 const char* option_type) {
2597 if (ignore) return false;
2598
2599 const char* spacer = " ";
2600 if (option_type == NULL) {
2601 option_type = ++spacer; // Set both to the empty string.
2602 }
2603
2604 if (os::obsolete_option(option)) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Obsolete %s%soption: %s\n", option_type, spacer,
2607 option->optionString);
2608 return false;
2609 } else {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Unrecognized %s%soption: %s\n", option_type, spacer,
2612 option->optionString);
2613 return true;
2614 }
2615 }
2616
2617 static const char* user_assertion_options[] = {
2618 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2619 };
2620
2621 static const char* system_assertion_options[] = {
2622 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2623 };
2624
2625 bool Arguments::parse_uintx(const char* value,
2626 uintx* uintx_arg,
2627 uintx min_size) {
2628
2629 // Check the sign first since atojulong() parses only unsigned values.
2630 bool value_is_positive = !(*value == '-');
2631
2632 if (value_is_positive) {
2633 julong n;
2634 bool good_return = atojulong(value, &n);
2635 if (good_return) {
2636 bool above_minimum = n >= min_size;
2637 bool value_is_too_large = n > max_uintx;
2638
2639 if (above_minimum && !value_is_too_large) {
2640 *uintx_arg = n;
2641 return true;
2642 }
2643 }
2644 }
2645 return false;
2646 }
2647
2648 unsigned int addreads_count = 0;
2649 unsigned int addexports_count = 0;
2650 unsigned int addopens_count = 0;
2651 unsigned int addmods_count = 0;
2652 unsigned int patch_mod_count = 0;
2653
2654 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2655 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2656 char* property = AllocateHeap(prop_len, mtArguments);
2657 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2658 if (ret < 0 || ret >= (int)prop_len) {
2659 FreeHeap(property);
2660 return false;
2661 }
2662 bool added = add_property(property, UnwriteableProperty, internal);
2663 FreeHeap(property);
2664 return added;
2665 }
2666
2667 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2668 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2669 if (count < 1000) {
2670 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2671 char* property = AllocateHeap(prop_len, mtArguments);
2672 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2673 if (ret < 0 || ret >= (int)prop_len) {
2674 FreeHeap(property);
2675 return false;
2676 }
2677 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2678 FreeHeap(property);
2679 return added;
2680 }
2681 return false;
2682 }
2683
2684 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2685 julong* long_arg,
2686 julong min_size) {
2687 if (!atojulong(s, long_arg)) return arg_unreadable;
2688 return check_memory_size(*long_arg, min_size);
2689 }
2690
2691 // Parse JavaVMInitArgs structure
2692
2693 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2694 const JavaVMInitArgs *java_options_args,
2695 const JavaVMInitArgs *cmd_line_args) {
2696 bool patch_mod_javabase = false;
2697
2698 // Save default settings for some mode flags
2699 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2700 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2701 Arguments::_ClipInlining = ClipInlining;
2702 Arguments::_BackgroundCompilation = BackgroundCompilation;
2703 if (TieredCompilation) {
2704 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2705 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2706 }
2707
2708 // Setup flags for mixed which is the default
2709 set_mode_flags(_mixed);
2710
2711 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2712 // variable (if present).
2713 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2714 if (result != JNI_OK) {
2715 return result;
2716 }
2717
2718 // Parse args structure generated from the command line flags.
2719 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2720 if (result != JNI_OK) {
2721 return result;
2722 }
2723
2724 // Parse args structure generated from the _JAVA_OPTIONS environment
2725 // variable (if present) (mimics classic VM)
2726 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2727 if (result != JNI_OK) {
2728 return result;
2729 }
2730
2731 // Do final processing now that all arguments have been parsed
2732 result = finalize_vm_init_args();
2733 if (result != JNI_OK) {
2734 return result;
2735 }
2736
2737 #if INCLUDE_CDS
2738 if (UseSharedSpaces && patch_mod_javabase) {
2739 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2740 }
2741 #endif
2742
2743 return JNI_OK;
2744 }
2745
2746 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2747 // represents a valid JDWP agent. is_path==true denotes that we
2748 // are dealing with -agentpath (case where name is a path), otherwise with
2749 // -agentlib
2750 bool valid_jdwp_agent(char *name, bool is_path) {
2751 char *_name;
2752 const char *_jdwp = "jdwp";
2753 size_t _len_jdwp, _len_prefix;
2754
2755 if (is_path) {
2756 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2757 return false;
2758 }
2759
2760 _name++; // skip past last path separator
2761 _len_prefix = strlen(JNI_LIB_PREFIX);
2762
2763 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2764 return false;
2765 }
2766
2767 _name += _len_prefix;
2768 _len_jdwp = strlen(_jdwp);
2769
2770 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2771 _name += _len_jdwp;
2772 }
2773 else {
2774 return false;
2775 }
2776
2777 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2778 return false;
2779 }
2780
2781 return true;
2782 }
2783
2784 if (strcmp(name, _jdwp) == 0) {
2785 return true;
2786 }
2787
2788 return false;
2789 }
2790
2791 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2792 // --patch-module=<module>=<file>(<pathsep><file>)*
2793 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2794 // Find the equal sign between the module name and the path specification
2795 const char* module_equal = strchr(patch_mod_tail, '=');
2796 if (module_equal == NULL) {
2797 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2798 return JNI_ERR;
2799 } else {
2800 // Pick out the module name
2801 size_t module_len = module_equal - patch_mod_tail;
2802 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2803 if (module_name != NULL) {
2804 memcpy(module_name, patch_mod_tail, module_len);
2805 *(module_name + module_len) = '\0';
2806 // The path piece begins one past the module_equal sign
2807 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2808 FREE_C_HEAP_ARRAY(char, module_name);
2809 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2810 return JNI_ENOMEM;
2811 }
2812 } else {
2813 return JNI_ENOMEM;
2814 }
2815 }
2816 return JNI_OK;
2817 }
2818
2819 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2820 // For match_option to return remaining or value part of option string
2821 const char* tail;
2822
2823 // iterate over arguments
2824 for (int index = 0; index < args->nOptions; index++) {
2825 bool is_absolute_path = false; // for -agentpath vs -agentlib
2826
2827 const JavaVMOption* option = args->options + index;
2828
2829 if (!match_option(option, "-Djava.class.path", &tail) &&
2830 !match_option(option, "-Dsun.java.command", &tail) &&
2831 !match_option(option, "-Dsun.java.launcher", &tail)) {
2832
2833 // add all jvm options to the jvm_args string. This string
2834 // is used later to set the java.vm.args PerfData string constant.
2835 // the -Djava.class.path and the -Dsun.java.command options are
2836 // omitted from jvm_args string as each have their own PerfData
2837 // string constant object.
2838 build_jvm_args(option->optionString);
2839 }
2840
2841 // -verbose:[class/gc/jni]
2842 if (match_option(option, "-verbose", &tail)) {
2843 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2844 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2845 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2846 } else if (!strcmp(tail, ":gc")) {
2847 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2848 } else if (!strcmp(tail, ":jni")) {
2849 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 }
2853 // -da / -ea / -disableassertions / -enableassertions
2854 // These accept an optional class/package name separated by a colon, e.g.,
2855 // -da:java.lang.Thread.
2856 } else if (match_option(option, user_assertion_options, &tail, true)) {
2857 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2858 if (*tail == '\0') {
2859 JavaAssertions::setUserClassDefault(enable);
2860 } else {
2861 assert(*tail == ':', "bogus match by match_option()");
2862 JavaAssertions::addOption(tail + 1, enable);
2863 }
2864 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2865 } else if (match_option(option, system_assertion_options, &tail, false)) {
2866 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2867 JavaAssertions::setSystemClassDefault(enable);
2868 // -bootclasspath:
2869 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2870 jio_fprintf(defaultStream::output_stream(),
2871 "-Xbootclasspath is no longer a supported option.\n");
2872 return JNI_EINVAL;
2873 // -bootclasspath/a:
2874 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2875 Arguments::append_sysclasspath(tail);
2876 // -bootclasspath/p:
2877 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2878 jio_fprintf(defaultStream::output_stream(),
2879 "-Xbootclasspath/p is no longer a supported option.\n");
2880 return JNI_EINVAL;
2881 // -Xrun
2882 } else if (match_option(option, "-Xrun", &tail)) {
2883 if (tail != NULL) {
2884 const char* pos = strchr(tail, ':');
2885 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2886 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2887 jio_snprintf(name, len + 1, "%s", tail);
2888
2889 char *options = NULL;
2890 if(pos != NULL) {
2891 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2892 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2893 }
2894 #if !INCLUDE_JVMTI
2895 if (strcmp(name, "jdwp") == 0) {
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Debugging agents are not supported in this VM\n");
2898 return JNI_ERR;
2899 }
2900 #endif // !INCLUDE_JVMTI
2901 add_init_library(name, options);
2902 }
2903 } else if (match_option(option, "--add-reads=", &tail)) {
2904 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2905 return JNI_ENOMEM;
2906 }
2907 } else if (match_option(option, "--add-exports=", &tail)) {
2908 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2909 return JNI_ENOMEM;
2910 }
2911 } else if (match_option(option, "--add-opens=", &tail)) {
2912 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2913 return JNI_ENOMEM;
2914 }
2915 } else if (match_option(option, "--add-modules=", &tail)) {
2916 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2917 return JNI_ENOMEM;
2918 }
2919 } else if (match_option(option, "--limit-modules=", &tail)) {
2920 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2921 return JNI_ENOMEM;
2922 }
2923 } else if (match_option(option, "--module-path=", &tail)) {
2924 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2925 return JNI_ENOMEM;
2926 }
2927 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2928 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2929 return JNI_ENOMEM;
2930 }
2931 } else if (match_option(option, "--patch-module=", &tail)) {
2932 // --patch-module=<module>=<file>(<pathsep><file>)*
2933 int res = process_patch_mod_option(tail, patch_mod_javabase);
2934 if (res != JNI_OK) {
2935 return res;
2936 }
2937 } else if (match_option(option, "--permit-illegal-access")) {
2938 if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) {
2939 return JNI_ENOMEM;
2940 }
2941 // -agentlib and -agentpath
2942 } else if (match_option(option, "-agentlib:", &tail) ||
2943 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2944 if(tail != NULL) {
2945 const char* pos = strchr(tail, '=');
2946 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2947 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2948 name[len] = '\0';
2949
2950 char *options = NULL;
2951 if(pos != NULL) {
2952 options = os::strdup_check_oom(pos + 1, mtArguments);
2953 }
2954 #if !INCLUDE_JVMTI
2955 if (valid_jdwp_agent(name, is_absolute_path)) {
2956 jio_fprintf(defaultStream::error_stream(),
2957 "Debugging agents are not supported in this VM\n");
2958 return JNI_ERR;
2959 }
2960 #endif // !INCLUDE_JVMTI
2961 add_init_agent(name, options, is_absolute_path);
2962 }
2963 // -javaagent
2964 } else if (match_option(option, "-javaagent:", &tail)) {
2965 #if !INCLUDE_JVMTI
2966 jio_fprintf(defaultStream::error_stream(),
2967 "Instrumentation agents are not supported in this VM\n");
2968 return JNI_ERR;
2969 #else
2970 if (tail != NULL) {
2971 size_t length = strlen(tail) + 1;
2972 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2973 jio_snprintf(options, length, "%s", tail);
2974 add_init_agent("instrument", options, false);
2975 // java agents need module java.instrument
2976 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2977 return JNI_ENOMEM;
2978 }
2979 }
2980 #endif // !INCLUDE_JVMTI
2981 // -Xnoclassgc
2982 } else if (match_option(option, "-Xnoclassgc")) {
2983 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 // -Xconcgc
2987 } else if (match_option(option, "-Xconcgc")) {
2988 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2989 return JNI_EINVAL;
2990 }
2991 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2992 // -Xnoconcgc
2993 } else if (match_option(option, "-Xnoconcgc")) {
2994 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2998 // -Xbatch
2999 } else if (match_option(option, "-Xbatch")) {
3000 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 // -Xmn for compatibility with other JVM vendors
3004 } else if (match_option(option, "-Xmn", &tail)) {
3005 julong long_initial_young_size = 0;
3006 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3007 if (errcode != arg_in_range) {
3008 jio_fprintf(defaultStream::error_stream(),
3009 "Invalid initial young generation size: %s\n", option->optionString);
3010 describe_range_error(errcode);
3011 return JNI_EINVAL;
3012 }
3013 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 // -Xms
3020 } else if (match_option(option, "-Xms", &tail)) {
3021 julong long_initial_heap_size = 0;
3022 // an initial heap size of 0 means automatically determine
3023 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3024 if (errcode != arg_in_range) {
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Invalid initial heap size: %s\n", option->optionString);
3027 describe_range_error(errcode);
3028 return JNI_EINVAL;
3029 }
3030 set_min_heap_size((size_t)long_initial_heap_size);
3031 // Currently the minimum size and the initial heap sizes are the same.
3032 // Can be overridden with -XX:InitialHeapSize.
3033 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 // -Xmx
3037 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3038 julong long_max_heap_size = 0;
3039 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3040 if (errcode != arg_in_range) {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Invalid maximum heap size: %s\n", option->optionString);
3043 describe_range_error(errcode);
3044 return JNI_EINVAL;
3045 }
3046 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 // Xmaxf
3050 } else if (match_option(option, "-Xmaxf", &tail)) {
3051 char* err;
3052 int maxf = (int)(strtod(tail, &err) * 100);
3053 if (*err != '\0' || *tail == '\0') {
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Bad max heap free percentage size: %s\n",
3056 option->optionString);
3057 return JNI_EINVAL;
3058 } else {
3059 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3060 return JNI_EINVAL;
3061 }
3062 }
3063 // Xminf
3064 } else if (match_option(option, "-Xminf", &tail)) {
3065 char* err;
3066 int minf = (int)(strtod(tail, &err) * 100);
3067 if (*err != '\0' || *tail == '\0') {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "Bad min heap free percentage size: %s\n",
3070 option->optionString);
3071 return JNI_EINVAL;
3072 } else {
3073 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 }
3077 // -Xss
3078 } else if (match_option(option, "-Xss", &tail)) {
3079 julong long_ThreadStackSize = 0;
3080 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3081 if (errcode != arg_in_range) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Invalid thread stack size: %s\n", option->optionString);
3084 describe_range_error(errcode);
3085 return JNI_EINVAL;
3086 }
3087 // Internally track ThreadStackSize in units of 1024 bytes.
3088 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3089 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3090 return JNI_EINVAL;
3091 }
3092 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3093 } else if (match_option(option, "-Xoss", &tail) ||
3094 match_option(option, "-Xsqnopause") ||
3095 match_option(option, "-Xoptimize") ||
3096 match_option(option, "-Xboundthreads") ||
3097 match_option(option, "-Xusealtsigs")) {
3098 // All these options are deprecated in JDK 9 and will be removed in a future release
3099 char version[256];
3100 JDK_Version::jdk(9).to_string(version, sizeof(version));
3101 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3102 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3103 julong long_CodeCacheExpansionSize = 0;
3104 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3105 if (errcode != arg_in_range) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3108 os::vm_page_size()/K);
3109 return JNI_EINVAL;
3110 }
3111 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3112 return JNI_EINVAL;
3113 }
3114 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3115 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3116 julong long_ReservedCodeCacheSize = 0;
3117
3118 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3119 if (errcode != arg_in_range) {
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Invalid maximum code cache size: %s.\n", option->optionString);
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 // -XX:NonNMethodCodeHeapSize=
3128 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3129 julong long_NonNMethodCodeHeapSize = 0;
3130
3131 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3132 if (errcode != arg_in_range) {
3133 jio_fprintf(defaultStream::error_stream(),
3134 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3135 return JNI_EINVAL;
3136 }
3137 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3138 return JNI_EINVAL;
3139 }
3140 // -XX:ProfiledCodeHeapSize=
3141 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3142 julong long_ProfiledCodeHeapSize = 0;
3143
3144 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3145 if (errcode != arg_in_range) {
3146 jio_fprintf(defaultStream::error_stream(),
3147 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3148 return JNI_EINVAL;
3149 }
3150 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 // -XX:NonProfiledCodeHeapSizee=
3154 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3155 julong long_NonProfiledCodeHeapSize = 0;
3156
3157 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3158 if (errcode != arg_in_range) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3161 return JNI_EINVAL;
3162 }
3163 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166 // -green
3167 } else if (match_option(option, "-green")) {
3168 jio_fprintf(defaultStream::error_stream(),
3169 "Green threads support not available\n");
3170 return JNI_EINVAL;
3171 // -native
3172 } else if (match_option(option, "-native")) {
3173 // HotSpot always uses native threads, ignore silently for compatibility
3174 // -Xrs
3175 } else if (match_option(option, "-Xrs")) {
3176 // Classic/EVM option, new functionality
3177 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 // -Xprof
3181 } else if (match_option(option, "-Xprof")) {
3182 #if INCLUDE_FPROF
3183 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3184 _has_profile = true;
3185 #else // INCLUDE_FPROF
3186 jio_fprintf(defaultStream::error_stream(),
3187 "Flat profiling is not supported in this VM.\n");
3188 return JNI_ERR;
3189 #endif // INCLUDE_FPROF
3190 // -Xconcurrentio
3191 } else if (match_option(option, "-Xconcurrentio")) {
3192 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3205 return JNI_EINVAL;
3206 }
3207
3208 // -Xinternalversion
3209 } else if (match_option(option, "-Xinternalversion")) {
3210 jio_fprintf(defaultStream::output_stream(), "%s\n",
3211 VM_Version::internal_vm_info_string());
3212 vm_exit(0);
3213 #ifndef PRODUCT
3214 // -Xprintflags
3215 } else if (match_option(option, "-Xprintflags")) {
3216 CommandLineFlags::printFlags(tty, false);
3217 vm_exit(0);
3218 #endif
3219 // -D
3220 } else if (match_option(option, "-D", &tail)) {
3221 const char* value;
3222 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3223 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3224 // abort if -Djava.endorsed.dirs is set
3225 jio_fprintf(defaultStream::output_stream(),
3226 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3227 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3228 return JNI_EINVAL;
3229 }
3230 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3231 *value != '\0' && strcmp(value, "\"\"") != 0) {
3232 // abort if -Djava.ext.dirs is set
3233 jio_fprintf(defaultStream::output_stream(),
3234 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3235 return JNI_EINVAL;
3236 }
3237 // Check for module related properties. They must be set using the modules
3238 // options. For example: use "--add-modules=java.sql", not
3239 // "-Djdk.module.addmods=java.sql"
3240 if (is_internal_module_property(option->optionString + 2)) {
3241 needs_module_property_warning = true;
3242 continue;
3243 }
3244
3245 if (!add_property(tail)) {
3246 return JNI_ENOMEM;
3247 }
3248 // Out of the box management support
3249 if (match_option(option, "-Dcom.sun.management", &tail)) {
3250 #if INCLUDE_MANAGEMENT
3251 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254 // management agent in module jdk.management.agent
3255 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3256 return JNI_ENOMEM;
3257 }
3258 #else
3259 jio_fprintf(defaultStream::output_stream(),
3260 "-Dcom.sun.management is not supported in this VM.\n");
3261 return JNI_ERR;
3262 #endif
3263 }
3264 // -Xint
3265 } else if (match_option(option, "-Xint")) {
3266 set_mode_flags(_int);
3267 // -Xmixed
3268 } else if (match_option(option, "-Xmixed")) {
3269 set_mode_flags(_mixed);
3270 // -Xcomp
3271 } else if (match_option(option, "-Xcomp")) {
3272 // for testing the compiler; turn off all flags that inhibit compilation
3273 set_mode_flags(_comp);
3274 // -Xshare:dump
3275 } else if (match_option(option, "-Xshare:dump")) {
3276 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3277 return JNI_EINVAL;
3278 }
3279 set_mode_flags(_int); // Prevent compilation, which creates objects
3280 // -Xshare:on
3281 } else if (match_option(option, "-Xshare:on")) {
3282 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3283 return JNI_EINVAL;
3284 }
3285 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3286 return JNI_EINVAL;
3287 }
3288 // -Xshare:auto
3289 } else if (match_option(option, "-Xshare:auto")) {
3290 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3294 return JNI_EINVAL;
3295 }
3296 // -Xshare:off
3297 } else if (match_option(option, "-Xshare:off")) {
3298 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 // -Xverify
3305 } else if (match_option(option, "-Xverify", &tail)) {
3306 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3307 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3308 return JNI_EINVAL;
3309 }
3310 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3311 return JNI_EINVAL;
3312 }
3313 } else if (strcmp(tail, ":remote") == 0) {
3314 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3315 return JNI_EINVAL;
3316 }
3317 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320 } else if (strcmp(tail, ":none") == 0) {
3321 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3322 return JNI_EINVAL;
3323 }
3324 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3325 return JNI_EINVAL;
3326 }
3327 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3328 return JNI_EINVAL;
3329 }
3330 // -Xdebug
3331 } else if (match_option(option, "-Xdebug")) {
3332 // note this flag has been used, then ignore
3333 set_xdebug_mode(true);
3334 // -Xnoagent
3335 } else if (match_option(option, "-Xnoagent")) {
3336 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3337 } else if (match_option(option, "-Xloggc:", &tail)) {
3338 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3339 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3340 _gc_log_filename = os::strdup_check_oom(tail);
3341 } else if (match_option(option, "-Xlog", &tail)) {
3342 bool ret = false;
3343 if (strcmp(tail, ":help") == 0) {
3344 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3345 vm_exit(0);
3346 } else if (strcmp(tail, ":disable") == 0) {
3347 LogConfiguration::disable_logging();
3348 ret = true;
3349 } else if (*tail == '\0') {
3350 ret = LogConfiguration::parse_command_line_arguments();
3351 assert(ret, "-Xlog without arguments should never fail to parse");
3352 } else if (*tail == ':') {
3353 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3354 }
3355 if (ret == false) {
3356 jio_fprintf(defaultStream::error_stream(),
3357 "Invalid -Xlog option '-Xlog%s'\n",
3358 tail);
3359 return JNI_EINVAL;
3360 }
3361 // JNI hooks
3362 } else if (match_option(option, "-Xcheck", &tail)) {
3363 if (!strcmp(tail, ":jni")) {
3364 #if !INCLUDE_JNI_CHECK
3365 warning("JNI CHECKING is not supported in this VM");
3366 #else
3367 CheckJNICalls = true;
3368 #endif // INCLUDE_JNI_CHECK
3369 } else if (is_bad_option(option, args->ignoreUnrecognized,
3370 "check")) {
3371 return JNI_EINVAL;
3372 }
3373 } else if (match_option(option, "vfprintf")) {
3374 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3375 } else if (match_option(option, "exit")) {
3376 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3377 } else if (match_option(option, "abort")) {
3378 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3379 // -XX:+AggressiveHeap
3380 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3381 jint result = set_aggressive_heap_flags();
3382 if (result != JNI_OK) {
3383 return result;
3384 }
3385 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3386 // and the last option wins.
3387 } else if (match_option(option, "-XX:+NeverTenure")) {
3388 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3389 return JNI_EINVAL;
3390 }
3391 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3392 return JNI_EINVAL;
3393 }
3394 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3395 return JNI_EINVAL;
3396 }
3397 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3398 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3399 return JNI_EINVAL;
3400 }
3401 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3402 return JNI_EINVAL;
3403 }
3404 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3408 uintx max_tenuring_thresh = 0;
3409 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3412 return JNI_EINVAL;
3413 }
3414
3415 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3416 return JNI_EINVAL;
3417 }
3418
3419 if (MaxTenuringThreshold == 0) {
3420 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3421 return JNI_EINVAL;
3422 }
3423 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3424 return JNI_EINVAL;
3425 }
3426 } else {
3427 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3428 return JNI_EINVAL;
3429 }
3430 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3431 return JNI_EINVAL;
3432 }
3433 }
3434 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3435 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3436 return JNI_EINVAL;
3437 }
3438 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3439 return JNI_EINVAL;
3440 }
3441 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3442 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3443 return JNI_EINVAL;
3444 }
3445 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3446 return JNI_EINVAL;
3447 }
3448 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3449 #if defined(DTRACE_ENABLED)
3450 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3451 return JNI_EINVAL;
3452 }
3453 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3454 return JNI_EINVAL;
3455 }
3456 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3457 return JNI_EINVAL;
3458 }
3459 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3460 return JNI_EINVAL;
3461 }
3462 #else // defined(DTRACE_ENABLED)
3463 jio_fprintf(defaultStream::error_stream(),
3464 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3465 return JNI_EINVAL;
3466 #endif // defined(DTRACE_ENABLED)
3467 #ifdef ASSERT
3468 } else if (match_option(option, "-XX:+FullGCALot")) {
3469 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3470 return JNI_EINVAL;
3471 }
3472 // disable scavenge before parallel mark-compact
3473 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3474 return JNI_EINVAL;
3475 }
3476 #endif
3477 #if !INCLUDE_MANAGEMENT
3478 } else if (match_option(option, "-XX:+ManagementServer")) {
3479 jio_fprintf(defaultStream::error_stream(),
3480 "ManagementServer is not supported in this VM.\n");
3481 return JNI_ERR;
3482 #endif // INCLUDE_MANAGEMENT
3483 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3484 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3485 // already been handled
3486 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3487 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3488 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3489 return JNI_EINVAL;
3490 }
3491 }
3492 // Unknown option
3493 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3494 return JNI_ERR;
3495 }
3496 }
3497
3498 // PrintSharedArchiveAndExit will turn on
3499 // -Xshare:on
3500 // -Xlog:class+path=info
3501 if (PrintSharedArchiveAndExit) {
3502 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3503 return JNI_EINVAL;
3504 }
3505 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3506 return JNI_EINVAL;
3507 }
3508 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3509 }
3510
3511 // Change the default value for flags which have different default values
3512 // when working with older JDKs.
3513 #ifdef LINUX
3514 if (JDK_Version::current().compare_major(6) <= 0 &&
3515 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3516 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3517 }
3518 #endif // LINUX
3519 fix_appclasspath();
3520 return JNI_OK;
3521 }
3522
3523 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3524 // For java.base check for duplicate --patch-module options being specified on the command line.
3525 // This check is only required for java.base, all other duplicate module specifications
3526 // will be checked during module system initialization. The module system initialization
3527 // will throw an ExceptionInInitializerError if this situation occurs.
3528 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3529 if (*patch_mod_javabase) {
3530 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3531 } else {
3532 *patch_mod_javabase = true;
3533 }
3534 }
3535
3536 // Create GrowableArray lazily, only if --patch-module has been specified
3537 if (_patch_mod_prefix == NULL) {
3538 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3539 }
3540
3541 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3542 }
3543
3544 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3545 //
3546 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3547 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3548 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3549 // path is treated as the current directory.
3550 //
3551 // This causes problems with CDS, which requires that all directories specified in the classpath
3552 // must be empty. In most cases, applications do NOT want to load classes from the current
3553 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3554 // scripts compatible with CDS.
3555 void Arguments::fix_appclasspath() {
3556 if (IgnoreEmptyClassPaths) {
3557 const char separator = *os::path_separator();
3558 const char* src = _java_class_path->value();
3559
3560 // skip over all the leading empty paths
3561 while (*src == separator) {
3562 src ++;
3563 }
3564
3565 char* copy = os::strdup_check_oom(src, mtArguments);
3566
3567 // trim all trailing empty paths
3568 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3569 *tail = '\0';
3570 }
3571
3572 char from[3] = {separator, separator, '\0'};
3573 char to [2] = {separator, '\0'};
3574 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3575 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3576 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3577 }
3578
3579 _java_class_path->set_writeable_value(copy);
3580 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3581 }
3582 }
3583
3584 static bool has_jar_files(const char* directory) {
3585 DIR* dir = os::opendir(directory);
3586 if (dir == NULL) return false;
3587
3588 struct dirent *entry;
3589 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3590 bool hasJarFile = false;
3591 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3592 const char* name = entry->d_name;
3593 const char* ext = name + strlen(name) - 4;
3594 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3595 }
3596 FREE_C_HEAP_ARRAY(char, dbuf);
3597 os::closedir(dir);
3598 return hasJarFile ;
3599 }
3600
3601 static int check_non_empty_dirs(const char* path) {
3602 const char separator = *os::path_separator();
3603 const char* const end = path + strlen(path);
3604 int nonEmptyDirs = 0;
3605 while (path < end) {
3606 const char* tmp_end = strchr(path, separator);
3607 if (tmp_end == NULL) {
3608 if (has_jar_files(path)) {
3609 nonEmptyDirs++;
3610 jio_fprintf(defaultStream::output_stream(),
3611 "Non-empty directory: %s\n", path);
3612 }
3613 path = end;
3614 } else {
3615 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3616 memcpy(dirpath, path, tmp_end - path);
3617 dirpath[tmp_end - path] = '\0';
3618 if (has_jar_files(dirpath)) {
3619 nonEmptyDirs++;
3620 jio_fprintf(defaultStream::output_stream(),
3621 "Non-empty directory: %s\n", dirpath);
3622 }
3623 FREE_C_HEAP_ARRAY(char, dirpath);
3624 path = tmp_end + 1;
3625 }
3626 }
3627 return nonEmptyDirs;
3628 }
3629
3630 jint Arguments::finalize_vm_init_args() {
3631 // check if the default lib/endorsed directory exists; if so, error
3632 char path[JVM_MAXPATHLEN];
3633 const char* fileSep = os::file_separator();
3634 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3635
3636 if (CheckEndorsedAndExtDirs) {
3637 int nonEmptyDirs = 0;
3638 // check endorsed directory
3639 nonEmptyDirs += check_non_empty_dirs(path);
3640 // check the extension directories
3641 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3642 if (nonEmptyDirs > 0) {
3643 return JNI_ERR;
3644 }
3645 }
3646
3647 DIR* dir = os::opendir(path);
3648 if (dir != NULL) {
3649 jio_fprintf(defaultStream::output_stream(),
3650 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3651 "in modular form will be supported via the concept of upgradeable modules.\n");
3652 os::closedir(dir);
3653 return JNI_ERR;
3654 }
3655
3656 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3657 dir = os::opendir(path);
3658 if (dir != NULL) {
3659 jio_fprintf(defaultStream::output_stream(),
3660 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3661 "Use -classpath instead.\n.");
3662 os::closedir(dir);
3663 return JNI_ERR;
3664 }
3665
3666 // This must be done after all arguments have been processed.
3667 // java_compiler() true means set to "NONE" or empty.
3668 if (java_compiler() && !xdebug_mode()) {
3669 // For backwards compatibility, we switch to interpreted mode if
3670 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3671 // not specified.
3672 set_mode_flags(_int);
3673 }
3674
3675 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3676 // but like -Xint, leave compilation thresholds unaffected.
3677 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3678 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3679 set_mode_flags(_int);
3680 }
3681
3682 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3683 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3684 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3685 }
3686
3687 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3688 // Don't degrade server performance for footprint
3689 if (FLAG_IS_DEFAULT(UseLargePages) &&
3690 MaxHeapSize < LargePageHeapSizeThreshold) {
3691 // No need for large granularity pages w/small heaps.
3692 // Note that large pages are enabled/disabled for both the
3693 // Java heap and the code cache.
3694 FLAG_SET_DEFAULT(UseLargePages, false);
3695 }
3696
3697 #elif defined(COMPILER2)
3698 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3699 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3700 }
3701 #endif
3702
3703 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3704 UNSUPPORTED_OPTION(ProfileInterpreter);
3705 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3706 #endif
3707
3708 #ifndef TIERED
3709 // Tiered compilation is undefined.
3710 UNSUPPORTED_OPTION(TieredCompilation);
3711 #endif
3712
3713 #if INCLUDE_JVMCI
3714 if (EnableJVMCI &&
3715 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3716 return JNI_ENOMEM;
3717 }
3718 #endif
3719
3720 // If we are running in a headless jre, force java.awt.headless property
3721 // to be true unless the property has already been set.
3722 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3723 if (os::is_headless_jre()) {
3724 const char* headless = Arguments::get_property("java.awt.headless");
3725 if (headless == NULL) {
3726 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3727 if (headless_env == NULL) {
3728 if (!add_property("java.awt.headless=true")) {
3729 return JNI_ENOMEM;
3730 }
3731 } else {
3732 char buffer[256];
3733 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3734 if (!add_property(buffer)) {
3735 return JNI_ENOMEM;
3736 }
3737 }
3738 }
3739 }
3740
3741 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3742 // CMS can only be used with ParNew
3743 FLAG_SET_ERGO(bool, UseParNewGC, true);
3744 }
3745
3746 if (!check_vm_args_consistency()) {
3747 return JNI_ERR;
3748 }
3749
3750 #if INCLUDE_JVMCI
3751 if (UseJVMCICompiler) {
3752 Compilation_mode = CompMode_server;
3753 }
3754 #endif
3755
3756 return JNI_OK;
3757 }
3758
3759 // Helper class for controlling the lifetime of JavaVMInitArgs
3760 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3761 // deleted on the destruction of the ScopedVMInitArgs object.
3762 class ScopedVMInitArgs : public StackObj {
3763 private:
3764 JavaVMInitArgs _args;
3765 char* _container_name;
3766 bool _is_set;
3767 char* _vm_options_file_arg;
3768
3769 public:
3770 ScopedVMInitArgs(const char *container_name) {
3771 _args.version = JNI_VERSION_1_2;
3772 _args.nOptions = 0;
3773 _args.options = NULL;
3774 _args.ignoreUnrecognized = false;
3775 _container_name = (char *)container_name;
3776 _is_set = false;
3777 _vm_options_file_arg = NULL;
3778 }
3779
3780 // Populates the JavaVMInitArgs object represented by this
3781 // ScopedVMInitArgs object with the arguments in options. The
3782 // allocated memory is deleted by the destructor. If this method
3783 // returns anything other than JNI_OK, then this object is in a
3784 // partially constructed state, and should be abandoned.
3785 jint set_args(GrowableArray<JavaVMOption>* options) {
3786 _is_set = true;
3787 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3788 JavaVMOption, options->length(), mtArguments);
3789 if (options_arr == NULL) {
3790 return JNI_ENOMEM;
3791 }
3792 _args.options = options_arr;
3793
3794 for (int i = 0; i < options->length(); i++) {
3795 options_arr[i] = options->at(i);
3796 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3797 if (options_arr[i].optionString == NULL) {
3798 // Rely on the destructor to do cleanup.
3799 _args.nOptions = i;
3800 return JNI_ENOMEM;
3801 }
3802 }
3803
3804 _args.nOptions = options->length();
3805 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3806 return JNI_OK;
3807 }
3808
3809 JavaVMInitArgs* get() { return &_args; }
3810 char* container_name() { return _container_name; }
3811 bool is_set() { return _is_set; }
3812 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3813 char* vm_options_file_arg() { return _vm_options_file_arg; }
3814
3815 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3816 if (_vm_options_file_arg != NULL) {
3817 os::free(_vm_options_file_arg);
3818 }
3819 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3820 }
3821
3822 ~ScopedVMInitArgs() {
3823 if (_vm_options_file_arg != NULL) {
3824 os::free(_vm_options_file_arg);
3825 }
3826 if (_args.options == NULL) return;
3827 for (int i = 0; i < _args.nOptions; i++) {
3828 os::free(_args.options[i].optionString);
3829 }
3830 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3831 }
3832
3833 // Insert options into this option list, to replace option at
3834 // vm_options_file_pos (-XX:VMOptionsFile)
3835 jint insert(const JavaVMInitArgs* args,
3836 const JavaVMInitArgs* args_to_insert,
3837 const int vm_options_file_pos) {
3838 assert(_args.options == NULL, "shouldn't be set yet");
3839 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3840 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3841
3842 int length = args->nOptions + args_to_insert->nOptions - 1;
3843 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3844 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3845 for (int i = 0; i < args->nOptions; i++) {
3846 if (i == vm_options_file_pos) {
3847 // insert the new options starting at the same place as the
3848 // -XX:VMOptionsFile option
3849 for (int j = 0; j < args_to_insert->nOptions; j++) {
3850 options->push(args_to_insert->options[j]);
3851 }
3852 } else {
3853 options->push(args->options[i]);
3854 }
3855 }
3856 // make into options array
3857 jint result = set_args(options);
3858 delete options;
3859 return result;
3860 }
3861 };
3862
3863 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3864 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3865 }
3866
3867 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3868 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3869 }
3870
3871 jint Arguments::parse_options_environment_variable(const char* name,
3872 ScopedVMInitArgs* vm_args) {
3873 char *buffer = ::getenv(name);
3874
3875 // Don't check this environment variable if user has special privileges
3876 // (e.g. unix su command).
3877 if (buffer == NULL || os::have_special_privileges()) {
3878 return JNI_OK;
3879 }
3880
3881 if ((buffer = os::strdup(buffer)) == NULL) {
3882 return JNI_ENOMEM;
3883 }
3884
3885 jio_fprintf(defaultStream::error_stream(),
3886 "Picked up %s: %s\n", name, buffer);
3887
3888 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3889
3890 os::free(buffer);
3891 return retcode;
3892 }
3893
3894 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3895 // read file into buffer
3896 int fd = ::open(file_name, O_RDONLY);
3897 if (fd < 0) {
3898 jio_fprintf(defaultStream::error_stream(),
3899 "Could not open options file '%s'\n",
3900 file_name);
3901 return JNI_ERR;
3902 }
3903
3904 struct stat stbuf;
3905 int retcode = os::stat(file_name, &stbuf);
3906 if (retcode != 0) {
3907 jio_fprintf(defaultStream::error_stream(),
3908 "Could not stat options file '%s'\n",
3909 file_name);
3910 os::close(fd);
3911 return JNI_ERR;
3912 }
3913
3914 if (stbuf.st_size == 0) {
3915 // tell caller there is no option data and that is ok
3916 os::close(fd);
3917 return JNI_OK;
3918 }
3919
3920 // '+ 1' for NULL termination even with max bytes
3921 size_t bytes_alloc = stbuf.st_size + 1;
3922
3923 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3924 if (NULL == buf) {
3925 jio_fprintf(defaultStream::error_stream(),
3926 "Could not allocate read buffer for options file parse\n");
3927 os::close(fd);
3928 return JNI_ENOMEM;
3929 }
3930
3931 memset(buf, 0, bytes_alloc);
3932
3933 // Fill buffer
3934 // Use ::read() instead of os::read because os::read()
3935 // might do a thread state transition
3936 // and it is too early for that here
3937
3938 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3939 os::close(fd);
3940 if (bytes_read < 0) {
3941 FREE_C_HEAP_ARRAY(char, buf);
3942 jio_fprintf(defaultStream::error_stream(),
3943 "Could not read options file '%s'\n", file_name);
3944 return JNI_ERR;
3945 }
3946
3947 if (bytes_read == 0) {
3948 // tell caller there is no option data and that is ok
3949 FREE_C_HEAP_ARRAY(char, buf);
3950 return JNI_OK;
3951 }
3952
3953 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3954
3955 FREE_C_HEAP_ARRAY(char, buf);
3956 return retcode;
3957 }
3958
3959 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3960 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3961
3962 // some pointers to help with parsing
3963 char *buffer_end = buffer + buf_len;
3964 char *opt_hd = buffer;
3965 char *wrt = buffer;
3966 char *rd = buffer;
3967
3968 // parse all options
3969 while (rd < buffer_end) {
3970 // skip leading white space from the input string
3971 while (rd < buffer_end && isspace(*rd)) {
3972 rd++;
3973 }
3974
3975 if (rd >= buffer_end) {
3976 break;
3977 }
3978
3979 // Remember this is where we found the head of the token.
3980 opt_hd = wrt;
3981
3982 // Tokens are strings of non white space characters separated
3983 // by one or more white spaces.
3984 while (rd < buffer_end && !isspace(*rd)) {
3985 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3986 int quote = *rd; // matching quote to look for
3987 rd++; // don't copy open quote
3988 while (rd < buffer_end && *rd != quote) {
3989 // include everything (even spaces)
3990 // up until the close quote
3991 *wrt++ = *rd++; // copy to option string
3992 }
3993
3994 if (rd < buffer_end) {
3995 rd++; // don't copy close quote
3996 } else {
3997 // did not see closing quote
3998 jio_fprintf(defaultStream::error_stream(),
3999 "Unmatched quote in %s\n", name);
4000 delete options;
4001 return JNI_ERR;
4002 }
4003 } else {
4004 *wrt++ = *rd++; // copy to option string
4005 }
4006 }
4007
4008 // steal a white space character and set it to NULL
4009 *wrt++ = '\0';
4010 // We now have a complete token
4011
4012 JavaVMOption option;
4013 option.optionString = opt_hd;
4014 option.extraInfo = NULL;
4015
4016 options->append(option); // Fill in option
4017
4018 rd++; // Advance to next character
4019 }
4020
4021 // Fill out JavaVMInitArgs structure.
4022 jint status = vm_args->set_args(options);
4023
4024 delete options;
4025 return status;
4026 }
4027
4028 void Arguments::set_shared_spaces_flags() {
4029 if (DumpSharedSpaces) {
4030 if (FailOverToOldVerifier) {
4031 // Don't fall back to the old verifier on verification failure. If a
4032 // class fails verification with the split verifier, it might fail the
4033 // CDS runtime verifier constraint check. In that case, we don't want
4034 // to share the class. We only archive classes that pass the split verifier.
4035 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4036 }
4037
4038 if (RequireSharedSpaces) {
4039 warning("Cannot dump shared archive while using shared archive");
4040 }
4041 UseSharedSpaces = false;
4042 #ifdef _LP64
4043 if (!UseCompressedOops || !UseCompressedClassPointers) {
4044 vm_exit_during_initialization(
4045 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4046 }
4047 } else {
4048 if (!UseCompressedOops || !UseCompressedClassPointers) {
4049 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4050 }
4051 #endif
4052 }
4053 }
4054
4055 // Sharing support
4056 // Construct the path to the archive
4057 static char* get_shared_archive_path() {
4058 char *shared_archive_path;
4059 if (SharedArchiveFile == NULL) {
4060 char jvm_path[JVM_MAXPATHLEN];
4061 os::jvm_path(jvm_path, sizeof(jvm_path));
4062 char *end = strrchr(jvm_path, *os::file_separator());
4063 if (end != NULL) *end = '\0';
4064 size_t jvm_path_len = strlen(jvm_path);
4065 size_t file_sep_len = strlen(os::file_separator());
4066 const size_t len = jvm_path_len + file_sep_len + 20;
4067 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4068 if (shared_archive_path != NULL) {
4069 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4070 jvm_path, os::file_separator());
4071 }
4072 } else {
4073 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4074 }
4075 return shared_archive_path;
4076 }
4077
4078 #ifndef PRODUCT
4079 // Determine whether LogVMOutput should be implicitly turned on.
4080 static bool use_vm_log() {
4081 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4082 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4083 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4084 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4085 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4086 return true;
4087 }
4088
4089 #ifdef COMPILER1
4090 if (PrintC1Statistics) {
4091 return true;
4092 }
4093 #endif // COMPILER1
4094
4095 #ifdef COMPILER2
4096 if (PrintOptoAssembly || PrintOptoStatistics) {
4097 return true;
4098 }
4099 #endif // COMPILER2
4100
4101 return false;
4102 }
4103
4104 #endif // PRODUCT
4105
4106 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4107 for (int index = 0; index < args->nOptions; index++) {
4108 const JavaVMOption* option = args->options + index;
4109 const char* tail;
4110 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4111 return true;
4112 }
4113 }
4114 return false;
4115 }
4116
4117 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4118 const char* vm_options_file,
4119 const int vm_options_file_pos,
4120 ScopedVMInitArgs* vm_options_file_args,
4121 ScopedVMInitArgs* args_out) {
4122 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4123 if (code != JNI_OK) {
4124 return code;
4125 }
4126
4127 if (vm_options_file_args->get()->nOptions < 1) {
4128 return JNI_OK;
4129 }
4130
4131 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4132 jio_fprintf(defaultStream::error_stream(),
4133 "A VM options file may not refer to a VM options file. "
4134 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4135 "options file '%s' in options container '%s' is an error.\n",
4136 vm_options_file_args->vm_options_file_arg(),
4137 vm_options_file_args->container_name());
4138 return JNI_EINVAL;
4139 }
4140
4141 return args_out->insert(args, vm_options_file_args->get(),
4142 vm_options_file_pos);
4143 }
4144
4145 // Expand -XX:VMOptionsFile found in args_in as needed.
4146 // mod_args and args_out parameters may return values as needed.
4147 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4148 ScopedVMInitArgs* mod_args,
4149 JavaVMInitArgs** args_out) {
4150 jint code = match_special_option_and_act(args_in, mod_args);
4151 if (code != JNI_OK) {
4152 return code;
4153 }
4154
4155 if (mod_args->is_set()) {
4156 // args_in contains -XX:VMOptionsFile and mod_args contains the
4157 // original options from args_in along with the options expanded
4158 // from the VMOptionsFile. Return a short-hand to the caller.
4159 *args_out = mod_args->get();
4160 } else {
4161 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4162 }
4163 return JNI_OK;
4164 }
4165
4166 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4167 ScopedVMInitArgs* args_out) {
4168 // Remaining part of option string
4169 const char* tail;
4170 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4171
4172 for (int index = 0; index < args->nOptions; index++) {
4173 const JavaVMOption* option = args->options + index;
4174 if (ArgumentsExt::process_options(option)) {
4175 continue;
4176 }
4177 if (match_option(option, "-XX:Flags=", &tail)) {
4178 Arguments::set_jvm_flags_file(tail);
4179 continue;
4180 }
4181 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4182 if (vm_options_file_args.found_vm_options_file_arg()) {
4183 jio_fprintf(defaultStream::error_stream(),
4184 "The option '%s' is already specified in the options "
4185 "container '%s' so the specification of '%s' in the "
4186 "same options container is an error.\n",
4187 vm_options_file_args.vm_options_file_arg(),
4188 vm_options_file_args.container_name(),
4189 option->optionString);
4190 return JNI_EINVAL;
4191 }
4192 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4193 // If there's a VMOptionsFile, parse that
4194 jint code = insert_vm_options_file(args, tail, index,
4195 &vm_options_file_args, args_out);
4196 if (code != JNI_OK) {
4197 return code;
4198 }
4199 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4200 if (args_out->is_set()) {
4201 // The VMOptions file inserted some options so switch 'args'
4202 // to the new set of options, and continue processing which
4203 // preserves "last option wins" semantics.
4204 args = args_out->get();
4205 // The first option from the VMOptionsFile replaces the
4206 // current option. So we back track to process the
4207 // replacement option.
4208 index--;
4209 }
4210 continue;
4211 }
4212 if (match_option(option, "-XX:+PrintVMOptions")) {
4213 PrintVMOptions = true;
4214 continue;
4215 }
4216 if (match_option(option, "-XX:-PrintVMOptions")) {
4217 PrintVMOptions = false;
4218 continue;
4219 }
4220 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4221 IgnoreUnrecognizedVMOptions = true;
4222 continue;
4223 }
4224 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4225 IgnoreUnrecognizedVMOptions = false;
4226 continue;
4227 }
4228 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4229 CommandLineFlags::printFlags(tty, false);
4230 vm_exit(0);
4231 }
4232 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4233 #if INCLUDE_NMT
4234 // The launcher did not setup nmt environment variable properly.
4235 if (!MemTracker::check_launcher_nmt_support(tail)) {
4236 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4237 }
4238
4239 // Verify if nmt option is valid.
4240 if (MemTracker::verify_nmt_option()) {
4241 // Late initialization, still in single-threaded mode.
4242 if (MemTracker::tracking_level() >= NMT_summary) {
4243 MemTracker::init();
4244 }
4245 } else {
4246 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4247 }
4248 continue;
4249 #else
4250 jio_fprintf(defaultStream::error_stream(),
4251 "Native Memory Tracking is not supported in this VM\n");
4252 return JNI_ERR;
4253 #endif
4254 }
4255
4256 #ifndef PRODUCT
4257 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4258 CommandLineFlags::printFlags(tty, true);
4259 vm_exit(0);
4260 }
4261 #endif
4262 }
4263 return JNI_OK;
4264 }
4265
4266 static void print_options(const JavaVMInitArgs *args) {
4267 const char* tail;
4268 for (int index = 0; index < args->nOptions; index++) {
4269 const JavaVMOption *option = args->options + index;
4270 if (match_option(option, "-XX:", &tail)) {
4271 logOption(tail);
4272 }
4273 }
4274 }
4275
4276 bool Arguments::handle_deprecated_print_gc_flags() {
4277 if (PrintGC) {
4278 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4279 }
4280 if (PrintGCDetails) {
4281 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4282 }
4283
4284 if (_gc_log_filename != NULL) {
4285 // -Xloggc was used to specify a filename
4286 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4287
4288 LogTarget(Error, logging) target;
4289 LogStreamCHeap errstream(target);
4290 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4291 } else if (PrintGC || PrintGCDetails) {
4292 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4293 }
4294 return true;
4295 }
4296
4297 void Arguments::handle_extra_cms_flags(const char* msg) {
4298 SpecialFlag flag;
4299 const char *flag_name = "UseConcMarkSweepGC";
4300 if (lookup_special_flag(flag_name, flag)) {
4301 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4302 warning("%s", msg);
4303 }
4304 }
4305
4306 // Parse entry point called from JNI_CreateJavaVM
4307
4308 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4309 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4310
4311 // Initialize ranges, constraints and writeables
4312 CommandLineFlagRangeList::init();
4313 CommandLineFlagConstraintList::init();
4314 CommandLineFlagWriteableList::init();
4315
4316 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4317 const char* hotspotrc = ".hotspotrc";
4318 bool settings_file_specified = false;
4319 bool needs_hotspotrc_warning = false;
4320 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4321 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4322
4323 // Pointers to current working set of containers
4324 JavaVMInitArgs* cur_cmd_args;
4325 JavaVMInitArgs* cur_java_options_args;
4326 JavaVMInitArgs* cur_java_tool_options_args;
4327
4328 // Containers for modified/expanded options
4329 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4330 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4331 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4332
4333
4334 jint code =
4335 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4336 if (code != JNI_OK) {
4337 return code;
4338 }
4339
4340 code = parse_java_options_environment_variable(&initial_java_options_args);
4341 if (code != JNI_OK) {
4342 return code;
4343 }
4344
4345 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4346 &mod_java_tool_options_args,
4347 &cur_java_tool_options_args);
4348 if (code != JNI_OK) {
4349 return code;
4350 }
4351
4352 code = expand_vm_options_as_needed(initial_cmd_args,
4353 &mod_cmd_args,
4354 &cur_cmd_args);
4355 if (code != JNI_OK) {
4356 return code;
4357 }
4358
4359 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4360 &mod_java_options_args,
4361 &cur_java_options_args);
4362 if (code != JNI_OK) {
4363 return code;
4364 }
4365
4366 const char* flags_file = Arguments::get_jvm_flags_file();
4367 settings_file_specified = (flags_file != NULL);
4368
4369 if (IgnoreUnrecognizedVMOptions) {
4370 cur_cmd_args->ignoreUnrecognized = true;
4371 cur_java_tool_options_args->ignoreUnrecognized = true;
4372 cur_java_options_args->ignoreUnrecognized = true;
4373 }
4374
4375 // Parse specified settings file
4376 if (settings_file_specified) {
4377 if (!process_settings_file(flags_file, true,
4378 cur_cmd_args->ignoreUnrecognized)) {
4379 return JNI_EINVAL;
4380 }
4381 } else {
4382 #ifdef ASSERT
4383 // Parse default .hotspotrc settings file
4384 if (!process_settings_file(".hotspotrc", false,
4385 cur_cmd_args->ignoreUnrecognized)) {
4386 return JNI_EINVAL;
4387 }
4388 #else
4389 struct stat buf;
4390 if (os::stat(hotspotrc, &buf) == 0) {
4391 needs_hotspotrc_warning = true;
4392 }
4393 #endif
4394 }
4395
4396 if (PrintVMOptions) {
4397 print_options(cur_java_tool_options_args);
4398 print_options(cur_cmd_args);
4399 print_options(cur_java_options_args);
4400 }
4401
4402 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4403 jint result = parse_vm_init_args(cur_java_tool_options_args,
4404 cur_java_options_args,
4405 cur_cmd_args);
4406
4407 if (result != JNI_OK) {
4408 return result;
4409 }
4410
4411 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4412 SharedArchivePath = get_shared_archive_path();
4413 if (SharedArchivePath == NULL) {
4414 return JNI_ENOMEM;
4415 }
4416
4417 // Set up VerifySharedSpaces
4418 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4419 VerifySharedSpaces = true;
4420 }
4421
4422 // Delay warning until here so that we've had a chance to process
4423 // the -XX:-PrintWarnings flag
4424 if (needs_hotspotrc_warning) {
4425 warning("%s file is present but has been ignored. "
4426 "Run with -XX:Flags=%s to load the file.",
4427 hotspotrc, hotspotrc);
4428 }
4429
4430 if (needs_module_property_warning) {
4431 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4432 " names that are reserved for internal use.");
4433 }
4434
4435 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4436 UNSUPPORTED_OPTION(UseLargePages);
4437 #endif
4438
4439 ArgumentsExt::report_unsupported_options();
4440
4441 #ifndef PRODUCT
4442 if (TraceBytecodesAt != 0) {
4443 TraceBytecodes = true;
4444 }
4445 if (CountCompiledCalls) {
4446 if (UseCounterDecay) {
4447 warning("UseCounterDecay disabled because CountCalls is set");
4448 UseCounterDecay = false;
4449 }
4450 }
4451 #endif // PRODUCT
4452
4453 if (ScavengeRootsInCode == 0) {
4454 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4455 warning("Forcing ScavengeRootsInCode non-zero");
4456 }
4457 ScavengeRootsInCode = 1;
4458 }
4459
4460 if (!handle_deprecated_print_gc_flags()) {
4461 return JNI_EINVAL;
4462 }
4463
4464 // Set object alignment values.
4465 set_object_alignment();
4466
4467 #if !INCLUDE_CDS
4468 if (DumpSharedSpaces || RequireSharedSpaces) {
4469 jio_fprintf(defaultStream::error_stream(),
4470 "Shared spaces are not supported in this VM\n");
4471 return JNI_ERR;
4472 }
4473 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4474 warning("Shared spaces are not supported in this VM");
4475 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4476 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4477 }
4478 no_shared_spaces("CDS Disabled");
4479 #endif // INCLUDE_CDS
4480
4481 return JNI_OK;
4482 }
4483
4484 jint Arguments::apply_ergo() {
4485 // Set flags based on ergonomics.
4486 set_ergonomics_flags();
4487
4488 #if INCLUDE_JVMCI
4489 set_jvmci_specific_flags();
4490 #endif
4491
4492 set_shared_spaces_flags();
4493
4494 // Check the GC selections again.
4495 if (!check_gc_consistency()) {
4496 return JNI_EINVAL;
4497 }
4498
4499 if (TieredCompilation) {
4500 set_tiered_flags();
4501 } else {
4502 int max_compilation_policy_choice = 1;
4503 #ifdef COMPILER2
4504 if (is_server_compilation_mode_vm()) {
4505 max_compilation_policy_choice = 2;
4506 }
4507 #endif
4508 // Check if the policy is valid.
4509 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4510 vm_exit_during_initialization(
4511 "Incompatible compilation policy selected", NULL);
4512 }
4513 // Scale CompileThreshold
4514 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4515 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4516 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4517 }
4518 }
4519
4520 #ifdef COMPILER2
4521 #ifndef PRODUCT
4522 if (PrintIdealGraphLevel > 0) {
4523 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4524 }
4525 #endif
4526 #endif
4527
4528 // Set heap size based on available physical memory
4529 set_heap_size();
4530
4531 ArgumentsExt::set_gc_specific_flags();
4532
4533 // Initialize Metaspace flags and alignments
4534 Metaspace::ergo_initialize();
4535
4536 // Set bytecode rewriting flags
4537 set_bytecode_flags();
4538
4539 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4540 jint code = set_aggressive_opts_flags();
4541 if (code != JNI_OK) {
4542 return code;
4543 }
4544
4545 // Turn off biased locking for locking debug mode flags,
4546 // which are subtly different from each other but neither works with
4547 // biased locking
4548 if (UseHeavyMonitors
4549 #ifdef COMPILER1
4550 || !UseFastLocking
4551 #endif // COMPILER1
4552 #if INCLUDE_JVMCI
4553 || !JVMCIUseFastLocking
4554 #endif
4555 ) {
4556 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4557 // flag set to true on command line; warn the user that they
4558 // can't enable biased locking here
4559 warning("Biased Locking is not supported with locking debug flags"
4560 "; ignoring UseBiasedLocking flag." );
4561 }
4562 UseBiasedLocking = false;
4563 }
4564
4565 #ifdef CC_INTERP
4566 // Clear flags not supported on zero.
4567 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4568 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4569 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4570 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4571 #endif // CC_INTERP
4572
4573 #ifdef COMPILER2
4574 if (!EliminateLocks) {
4575 EliminateNestedLocks = false;
4576 }
4577 if (!Inline) {
4578 IncrementalInline = false;
4579 }
4580 #ifndef PRODUCT
4581 if (!IncrementalInline) {
4582 AlwaysIncrementalInline = false;
4583 }
4584 #endif
4585 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4586 // nothing to use the profiling, turn if off
4587 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4588 }
4589 #endif
4590
4591 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4592 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4593 DebugNonSafepoints = true;
4594 }
4595
4596 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4597 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4598 }
4599
4600 if (UseOnStackReplacement && !UseLoopCounter) {
4601 warning("On-stack-replacement requires loop counters; enabling loop counters");
4602 FLAG_SET_DEFAULT(UseLoopCounter, true);
4603 }
4604
4605 #ifndef PRODUCT
4606 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4607 if (use_vm_log()) {
4608 LogVMOutput = true;
4609 }
4610 }
4611 #endif // PRODUCT
4612
4613 if (PrintCommandLineFlags) {
4614 CommandLineFlags::printSetFlags(tty);
4615 }
4616
4617 // Apply CPU specific policy for the BiasedLocking
4618 if (UseBiasedLocking) {
4619 if (!VM_Version::use_biased_locking() &&
4620 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4621 UseBiasedLocking = false;
4622 }
4623 }
4624 #ifdef COMPILER2
4625 if (!UseBiasedLocking || EmitSync != 0) {
4626 UseOptoBiasInlining = false;
4627 }
4628 #endif
4629
4630 return JNI_OK;
4631 }
4632
4633 jint Arguments::adjust_after_os() {
4634 if (UseNUMA) {
4635 if (UseParallelGC || UseParallelOldGC) {
4636 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4637 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4638 }
4639 }
4640 // UseNUMAInterleaving is set to ON for all collectors and
4641 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4642 // such as the parallel collector for Linux and Solaris will
4643 // interleave old gen and survivor spaces on top of NUMA
4644 // allocation policy for the eden space.
4645 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4646 // all platforms and ParallelGC on Windows will interleave all
4647 // of the heap spaces across NUMA nodes.
4648 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4649 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4650 }
4651 }
4652 return JNI_OK;
4653 }
4654
4655 int Arguments::PropertyList_count(SystemProperty* pl) {
4656 int count = 0;
4657 while(pl != NULL) {
4658 count++;
4659 pl = pl->next();
4660 }
4661 return count;
4662 }
4663
4664 // Return the number of readable properties.
4665 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4666 int count = 0;
4667 while(pl != NULL) {
4668 if (pl->is_readable()) {
4669 count++;
4670 }
4671 pl = pl->next();
4672 }
4673 return count;
4674 }
4675
4676 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4677 assert(key != NULL, "just checking");
4678 SystemProperty* prop;
4679 for (prop = pl; prop != NULL; prop = prop->next()) {
4680 if (strcmp(key, prop->key()) == 0) return prop->value();
4681 }
4682 return NULL;
4683 }
4684
4685 // Return the value of the requested property provided that it is a readable property.
4686 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4687 assert(key != NULL, "just checking");
4688 SystemProperty* prop;
4689 // Return the property value if the keys match and the property is not internal or
4690 // it's the special internal property "jdk.boot.class.path.append".
4691 for (prop = pl; prop != NULL; prop = prop->next()) {
4692 if (strcmp(key, prop->key()) == 0) {
4693 if (!prop->internal()) {
4694 return prop->value();
4695 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4696 return prop->value();
4697 } else {
4698 // Property is internal and not jdk.boot.class.path.append so return NULL.
4699 return NULL;
4700 }
4701 }
4702 }
4703 return NULL;
4704 }
4705
4706 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4707 int count = 0;
4708 const char* ret_val = NULL;
4709
4710 while(pl != NULL) {
4711 if(count >= index) {
4712 ret_val = pl->key();
4713 break;
4714 }
4715 count++;
4716 pl = pl->next();
4717 }
4718
4719 return ret_val;
4720 }
4721
4722 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4723 int count = 0;
4724 char* ret_val = NULL;
4725
4726 while(pl != NULL) {
4727 if(count >= index) {
4728 ret_val = pl->value();
4729 break;
4730 }
4731 count++;
4732 pl = pl->next();
4733 }
4734
4735 return ret_val;
4736 }
4737
4738 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4739 SystemProperty* p = *plist;
4740 if (p == NULL) {
4741 *plist = new_p;
4742 } else {
4743 while (p->next() != NULL) {
4744 p = p->next();
4745 }
4746 p->set_next(new_p);
4747 }
4748 }
4749
4750 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4751 bool writeable, bool internal) {
4752 if (plist == NULL)
4753 return;
4754
4755 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4756 PropertyList_add(plist, new_p);
4757 }
4758
4759 void Arguments::PropertyList_add(SystemProperty *element) {
4760 PropertyList_add(&_system_properties, element);
4761 }
4762
4763 // This add maintains unique property key in the list.
4764 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4765 PropertyAppendable append, PropertyWriteable writeable,
4766 PropertyInternal internal) {
4767 if (plist == NULL)
4768 return;
4769
4770 // If property key exist then update with new value.
4771 SystemProperty* prop;
4772 for (prop = *plist; prop != NULL; prop = prop->next()) {
4773 if (strcmp(k, prop->key()) == 0) {
4774 if (append == AppendProperty) {
4775 prop->append_value(v);
4776 } else {
4777 prop->set_value(v);
4778 }
4779 return;
4780 }
4781 }
4782
4783 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4784 }
4785
4786 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4787 // Returns true if all of the source pointed by src has been copied over to
4788 // the destination buffer pointed by buf. Otherwise, returns false.
4789 // Notes:
4790 // 1. If the length (buflen) of the destination buffer excluding the
4791 // NULL terminator character is not long enough for holding the expanded
4792 // pid characters, it also returns false instead of returning the partially
4793 // expanded one.
4794 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4795 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4796 char* buf, size_t buflen) {
4797 const char* p = src;
4798 char* b = buf;
4799 const char* src_end = &src[srclen];
4800 char* buf_end = &buf[buflen - 1];
4801
4802 while (p < src_end && b < buf_end) {
4803 if (*p == '%') {
4804 switch (*(++p)) {
4805 case '%': // "%%" ==> "%"
4806 *b++ = *p++;
4807 break;
4808 case 'p': { // "%p" ==> current process id
4809 // buf_end points to the character before the last character so
4810 // that we could write '\0' to the end of the buffer.
4811 size_t buf_sz = buf_end - b + 1;
4812 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4813
4814 // if jio_snprintf fails or the buffer is not long enough to hold
4815 // the expanded pid, returns false.
4816 if (ret < 0 || ret >= (int)buf_sz) {
4817 return false;
4818 } else {
4819 b += ret;
4820 assert(*b == '\0', "fail in copy_expand_pid");
4821 if (p == src_end && b == buf_end + 1) {
4822 // reach the end of the buffer.
4823 return true;
4824 }
4825 }
4826 p++;
4827 break;
4828 }
4829 default :
4830 *b++ = '%';
4831 }
4832 } else {
4833 *b++ = *p++;
4834 }
4835 }
4836 *b = '\0';
4837 return (p == src_end); // return false if not all of the source was copied
4838 }