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