1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagWriteableList.hpp"
46 #include "runtime/commandLineFlagRangeList.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/globals_extension.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/os.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/defaultStream.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/stringUtils.hpp"
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciRuntime.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc/cms/compactibleFreeListSpace.hpp"
62 #include "gc/g1/g1CollectedHeap.inline.hpp"
63 #include "gc/parallel/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 char* Arguments::_jvm_flags_file = NULL;
71 char** Arguments::_jvm_flags_array = NULL;
72 int Arguments::_num_jvm_flags = 0;
73 char** Arguments::_jvm_args_array = NULL;
74 int Arguments::_num_jvm_args = 0;
75 char* Arguments::_java_command = NULL;
76 SystemProperty* Arguments::_system_properties = NULL;
77 const char* Arguments::_gc_log_filename = NULL;
78 bool Arguments::_has_profile = false;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 size_t Arguments::_min_heap_size = 0;
81 Arguments::Mode Arguments::_mode = _mixed;
82 bool Arguments::_java_compiler = false;
83 bool Arguments::_xdebug_mode = false;
84 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
85 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
86 int Arguments::_sun_java_launcher_pid = -1;
87 bool Arguments::_sun_java_launcher_is_altjvm = false;
88 int Arguments::_bootclassloader_append_index = -1;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 size_t len = strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 #define MODULE_PROPERTY_PREFIX "jdk.module"
144 #define MODULE_PROPERTY_PREFIX_LEN 10
145 #define ADDEXPORTS "addexports"
146 #define ADDEXPORTS_LEN 10
147 #define ADDREADS "addreads"
148 #define ADDREADS_LEN 8
149 #define PATCH "patch"
150 #define PATCH_LEN 5
151 #define ADDMODS "addmods"
152 #define ADDMODS_LEN 7
153 #define LIMITMODS "limitmods"
154 #define LIMITMODS_LEN 9
155 #define PATH "path"
156 #define PATH_LEN 4
157 #define UPGRADE_PATH "upgrade.path"
158 #define UPGRADE_PATH_LEN 12
159
160 // Return TRUE if option matches property.<digits> or matches property.<digits>=.
161 static bool is_matching_numbered_property(const char* option, const char* property, size_t len) {
162 if (strncmp(option, property, len) == 0) {
163 // Check for digits.
164 const char* sptr = option + len;
165 if (isdigit(*sptr)) { // Make sure next char is a digit.
166 while (isdigit(*sptr)) {
167 sptr++;
168 if (*sptr == '=' || *sptr == '\0') {
169 return true;
170 }
171 }
172 }
173 }
174 return false;
175 }
176
177 // Return TRUE if option matches property or matches property=.
178 static bool is_matching_property(const char* option, const char* property, size_t len) {
179 return (strncmp(option, property, len) == 0) && (option[len] == '=' || option[len] == '\0');
180 }
181
182 // Return true if option_end is the name of a module-related java property
183 // with "-Djdk.module." removed.
184 static bool is_internal_module_property_end(const char* option_end) {
185 // For the repeating properties such as (-Djdk.module.patch.0
186 // -Djdk.module.patch.1, etc) return true for "<property_name>.<digit>[=]".
187 if (is_matching_numbered_property(option_end, ADDEXPORTS ".", ADDEXPORTS_LEN + 1) ||
188 is_matching_numbered_property(option_end, ADDREADS ".", ADDREADS_LEN + 1) ||
189 is_matching_numbered_property(option_end, PATCH ".", PATCH_LEN + 1)) {
190 return true;
191 }
192 return (is_matching_property(option_end, ADDMODS, ADDMODS_LEN) ||
193 is_matching_property(option_end, LIMITMODS, LIMITMODS_LEN));
194 }
195
196 // Return true if the option is one of the module-related java properties
197 // that can only be set using the proper module-related option.
198 static bool is_module_property(const JavaVMOption *option) {
199 if (strncmp(option->optionString, "-D" MODULE_PROPERTY_PREFIX ".", MODULE_PROPERTY_PREFIX_LEN + 3) == 0) {
200 const char* option_end = option->optionString + MODULE_PROPERTY_PREFIX_LEN + 3;
201 return (is_internal_module_property_end(option_end) ||
202 is_matching_property(option_end, PATH, PATH_LEN) ||
203 is_matching_property(option_end, UPGRADE_PATH, UPGRADE_PATH_LEN));
204 }
205 return false;
206 }
207
208 // Return true if the option is one of the module-related java properties
209 // that can only be set using the proper module-related option and cannot
210 // be read by jvmti.
211 // It's expected that the caller removed the leading "-D" from 'option'.
212 bool Arguments::is_internal_module_property(const char* option) {
213 assert((strncmp(option, "-D", 2) != 0), "Unexpected leading -D");
214 if (strncmp(option, MODULE_PROPERTY_PREFIX ".", MODULE_PROPERTY_PREFIX_LEN + 1) == 0) {
215 return is_internal_module_property_end(option + MODULE_PROPERTY_PREFIX_LEN + 1);
216 }
217 return false;
218 }
219
220 // Return true if any of the strings in null-terminated array 'names' matches.
221 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
222 // the option must match exactly.
223 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
224 bool tail_allowed) {
225 for (/* empty */; *names != NULL; ++names) {
226 if (match_option(option, *names, tail)) {
227 if (**tail == '\0' || tail_allowed && **tail == ':') {
228 return true;
229 }
230 }
231 }
232 return false;
233 }
234
235 static void logOption(const char* opt) {
236 if (PrintVMOptions) {
237 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
238 }
239 }
240
241 // Process java launcher properties.
242 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
243 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
244 // sun.java.launcher.pid is defined.
245 // Must do this before setting up other system properties,
246 // as some of them may depend on launcher type.
247 for (int index = 0; index < args->nOptions; index++) {
248 const JavaVMOption* option = args->options + index;
249 const char* tail;
250
251 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
252 process_java_launcher_argument(tail, option->extraInfo);
253 continue;
254 }
255 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
256 if (strcmp(tail, "true") == 0) {
257 _sun_java_launcher_is_altjvm = true;
258 }
259 continue;
260 }
261 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
262 _sun_java_launcher_pid = atoi(tail);
263 continue;
264 }
265 }
266 }
267
268 // Initialize system properties key and value.
269 void Arguments::init_system_properties() {
270
271 // Set up _system_boot_class_path which is not a property but
272 // relies heavily on argument processing and the jdk.boot.class.path.append
273 // property. It is used to store the underlying system boot class path.
274 _system_boot_class_path = new PathString(NULL);
275
276 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
277 "Java Virtual Machine Specification", false));
278 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
279 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
280 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
281 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
282
283 // Following are JVMTI agent writable properties.
284 // Properties values are set to NULL and they are
285 // os specific they are initialized in os::init_system_properties_values().
286 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
287 _java_library_path = new SystemProperty("java.library.path", NULL, true);
288 _java_home = new SystemProperty("java.home", NULL, true);
289 _java_class_path = new SystemProperty("java.class.path", "", true);
290 // jdk.boot.class.path.append is a non-writeable, internal property.
291 // It can only be set by either:
292 // - -Xbootclasspath/a:
293 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
294 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
295
296 // Add to System Property list.
297 PropertyList_add(&_system_properties, _sun_boot_library_path);
298 PropertyList_add(&_system_properties, _java_library_path);
299 PropertyList_add(&_system_properties, _java_home);
300 PropertyList_add(&_system_properties, _java_class_path);
301 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
302
303 // Set OS specific system properties values
304 os::init_system_properties_values();
305 }
306
307 // Update/Initialize System properties after JDK version number is known
308 void Arguments::init_version_specific_system_properties() {
309 enum { bufsz = 16 };
310 char buffer[bufsz];
311 const char* spec_vendor = "Oracle Corporation";
312 uint32_t spec_version = JDK_Version::current().major_version();
313
314 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
315
316 PropertyList_add(&_system_properties,
317 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
318 PropertyList_add(&_system_properties,
319 new SystemProperty("java.vm.specification.version", buffer, false));
320 PropertyList_add(&_system_properties,
321 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
322 }
323
324 /*
325 * -XX argument processing:
326 *
327 * -XX arguments are defined in several places, such as:
328 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
329 * -XX arguments are parsed in parse_argument().
330 * -XX argument bounds checking is done in check_vm_args_consistency().
331 *
332 * Over time -XX arguments may change. There are mechanisms to handle common cases:
333 *
334 * ALIASED: An option that is simply another name for another option. This is often
335 * part of the process of deprecating a flag, but not all aliases need
336 * to be deprecated.
337 *
338 * Create an alias for an option by adding the old and new option names to the
339 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
340 *
341 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
342 * support may be removed in the future. Both regular and aliased options may be
343 * deprecated.
344 *
345 * Add a deprecation warning for an option (or alias) by adding an entry in the
346 * "special_jvm_flags" table and setting the "deprecated_in" field.
347 * Often an option "deprecated" in one major release will
348 * be made "obsolete" in the next. In this case the entry should also have it's
349 * "obsolete_in" field set.
350 *
351 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
352 * on the command line. A warning is printed to let the user know that option might not
353 * be accepted in the future.
354 *
355 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
356 * table and setting the "obsolete_in" field.
357 *
358 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
359 * to the current JDK version. The system will flatly refuse to admit the existence of
360 * the flag. This allows a flag to die automatically over JDK releases.
361 *
362 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
363 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
364 * - Newly obsolete or expired deprecated options should have their global variable
365 * definitions removed (from globals.hpp, etc) and related implementations removed.
366 *
367 * Recommended approach for removing options:
368 *
369 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
370 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
371 *
372 * To remove internal options (e.g. diagnostic, experimental, develop options), use
373 * a 2-step model adding major release numbers to the obsolete and expire columns.
374 *
375 * To change the name of an option, use the alias table as well as a 2-step
376 * model adding major release numbers to the deprecate and expire columns.
377 * Think twice about aliasing commonly used customer options.
378 *
379 * There are times when it is appropriate to leave a future release number as undefined.
380 *
381 * Tests: Aliases should be tested in VMAliasOptions.java.
382 * Deprecated options should be tested in VMDeprecatedOptions.java.
383 */
384
385 // Obsolete or deprecated -XX flag.
386 typedef struct {
387 const char* name;
388 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
389 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
390 JDK_Version expired_in; // When the option expires (or "undefined").
391 } SpecialFlag;
392
393 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
394 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
395 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
396 // the command-line as usual, but will issue a warning.
397 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
398 // the command-line, while issuing a warning and ignoring the flag value.
399 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
400 // existence of the flag.
401 //
402 // MANUAL CLEANUP ON JDK VERSION UPDATES:
403 // This table ensures that the handling of options will update automatically when the JDK
404 // version is incremented, but the source code needs to be cleanup up manually:
405 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
406 // variable should be removed, as well as users of the variable.
407 // - As "deprecated" options age into "obsolete" options, move the entry into the
408 // "Obsolete Flags" section of the table.
409 // - All expired options should be removed from the table.
410 static SpecialFlag const special_jvm_flags[] = {
411 // -------------- Deprecated Flags --------------
412 // --- Non-alias flags - sorted by obsolete_in then expired_in:
413 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
414 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
415 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
416 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
417
418 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
419 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
420 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
421 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
422 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
423 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
424 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
425 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
426
427 // -------------- Obsolete Flags - sorted by expired_in --------------
428 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
429 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
430 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
431 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
432 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
433 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
434 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
435 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
436 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
437 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
438 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
439 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
440 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
441 #ifndef ZERO
442 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
443 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
444 #endif // ZERO
445 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
446 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
447 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
448 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
449 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
450 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
451 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
452 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
453 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
454 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
455 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
456
457 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
458 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
459 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
460 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
461 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
462 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
463 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
464 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
465 #endif
466
467 { NULL, JDK_Version(0), JDK_Version(0) }
468 };
469
470 // Flags that are aliases for other flags.
471 typedef struct {
472 const char* alias_name;
473 const char* real_name;
474 } AliasedFlag;
475
476 static AliasedFlag const aliased_jvm_flags[] = {
477 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
478 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
479 { "CMSMarkStackSize", "MarkStackSize" },
480 { "G1MarkStackSize", "MarkStackSize" },
481 { "ParallelMarkingThreads", "ConcGCThreads" },
482 { "ParallelCMSThreads", "ConcGCThreads" },
483 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
484 { NULL, NULL}
485 };
486
487 // NOTE: A compatibility request will be necessary for each alias to be removed.
488 static AliasedLoggingFlag const aliased_logging_flags[] = {
489 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
490 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
491 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
492 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
493 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
494 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
495 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
496 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
497 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
498 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
499 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
500 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
501 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
502 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
503 };
504
505 #ifndef PRODUCT
506 // These options are removed in jdk9. Remove this code for jdk10.
507 static AliasedFlag const removed_develop_logging_flags[] = {
508 { "TraceClassInitialization", "-Xlog:class+init" },
509 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
510 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
511 { "TraceItables", "-Xlog:itables=debug" },
512 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
513 { "TraceSafepoint", "-Xlog:safepoint=debug" },
514 { "TraceStartupTime", "-Xlog:startuptime" },
515 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
516 { "PrintVtables", "-Xlog:vtables=debug" },
517 { "VerboseVerification", "-Xlog:verification" },
518 { NULL, NULL }
519 };
520 #endif //PRODUCT
521
522 // Return true if "v" is less than "other", where "other" may be "undefined".
523 static bool version_less_than(JDK_Version v, JDK_Version other) {
524 assert(!v.is_undefined(), "must be defined");
525 if (!other.is_undefined() && v.compare(other) >= 0) {
526 return false;
527 } else {
528 return true;
529 }
530 }
531
532 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
533 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
534 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
535 flag = special_jvm_flags[i];
536 return true;
537 }
538 }
539 return false;
540 }
541
542 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
543 assert(version != NULL, "Must provide a version buffer");
544 SpecialFlag flag;
545 if (lookup_special_flag(flag_name, flag)) {
546 if (!flag.obsolete_in.is_undefined()) {
547 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
548 *version = flag.obsolete_in;
549 return true;
550 }
551 }
552 }
553 return false;
554 }
555
556 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
557 assert(version != NULL, "Must provide a version buffer");
558 SpecialFlag flag;
559 if (lookup_special_flag(flag_name, flag)) {
560 if (!flag.deprecated_in.is_undefined()) {
561 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
562 version_less_than(JDK_Version::current(), flag.expired_in)) {
563 *version = flag.deprecated_in;
564 return 1;
565 } else {
566 return -1;
567 }
568 }
569 }
570 return 0;
571 }
572
573 #ifndef PRODUCT
574 const char* Arguments::removed_develop_logging_flag_name(const char* name){
575 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
576 const AliasedFlag& flag = removed_develop_logging_flags[i];
577 if (strcmp(flag.alias_name, name) == 0) {
578 return flag.real_name;
579 }
580 }
581 return NULL;
582 }
583 #endif // PRODUCT
584
585 const char* Arguments::real_flag_name(const char *flag_name) {
586 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
587 const AliasedFlag& flag_status = aliased_jvm_flags[i];
588 if (strcmp(flag_status.alias_name, flag_name) == 0) {
589 return flag_status.real_name;
590 }
591 }
592 return flag_name;
593 }
594
595 #ifdef ASSERT
596 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
597 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
598 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
599 return true;
600 }
601 }
602 return false;
603 }
604
605 static bool verify_special_jvm_flags() {
606 bool success = true;
607 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
608 const SpecialFlag& flag = special_jvm_flags[i];
609 if (lookup_special_flag(flag.name, i)) {
610 warning("Duplicate special flag declaration \"%s\"", flag.name);
611 success = false;
612 }
613 if (flag.deprecated_in.is_undefined() &&
614 flag.obsolete_in.is_undefined()) {
615 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
616 success = false;
617 }
618
619 if (!flag.deprecated_in.is_undefined()) {
620 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
621 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
622 success = false;
623 }
624
625 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
626 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
627 success = false;
628 }
629 }
630
631 if (!flag.obsolete_in.is_undefined()) {
632 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
633 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
634 success = false;
635 }
636
637 // if flag has become obsolete it should not have a "globals" flag defined anymore.
638 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
639 if (Flag::find_flag(flag.name) != NULL) {
640 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
641 success = false;
642 }
643 }
644 }
645
646 if (!flag.expired_in.is_undefined()) {
647 // if flag has become expired it should not have a "globals" flag defined anymore.
648 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
649 if (Flag::find_flag(flag.name) != NULL) {
650 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
651 success = false;
652 }
653 }
654 }
655
656 }
657 return success;
658 }
659 #endif
660
661 // Parses a size specification string.
662 bool Arguments::atojulong(const char *s, julong* result) {
663 julong n = 0;
664 int args_read = 0;
665 bool is_hex = false;
666 // Skip leading 0[xX] for hexadecimal
667 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
668 s += 2;
669 is_hex = true;
670 args_read = sscanf(s, JULONG_FORMAT_X, &n);
671 } else {
672 args_read = sscanf(s, JULONG_FORMAT, &n);
673 }
674 if (args_read != 1) {
675 return false;
676 }
677 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
678 s++;
679 }
680 // 4705540: illegal if more characters are found after the first non-digit
681 if (strlen(s) > 1) {
682 return false;
683 }
684 switch (*s) {
685 case 'T': case 't':
686 *result = n * G * K;
687 // Check for overflow.
688 if (*result/((julong)G * K) != n) return false;
689 return true;
690 case 'G': case 'g':
691 *result = n * G;
692 if (*result/G != n) return false;
693 return true;
694 case 'M': case 'm':
695 *result = n * M;
696 if (*result/M != n) return false;
697 return true;
698 case 'K': case 'k':
699 *result = n * K;
700 if (*result/K != n) return false;
701 return true;
702 case '\0':
703 *result = n;
704 return true;
705 default:
706 return false;
707 }
708 }
709
710 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
711 if (size < min_size) return arg_too_small;
712 // Check that size will fit in a size_t (only relevant on 32-bit)
713 if (size > max_uintx) return arg_too_big;
714 return arg_in_range;
715 }
716
717 // Describe an argument out of range error
718 void Arguments::describe_range_error(ArgsRange errcode) {
719 switch(errcode) {
720 case arg_too_big:
721 jio_fprintf(defaultStream::error_stream(),
722 "The specified size exceeds the maximum "
723 "representable size.\n");
724 break;
725 case arg_too_small:
726 case arg_unreadable:
727 case arg_in_range:
728 // do nothing for now
729 break;
730 default:
731 ShouldNotReachHere();
732 }
733 }
734
735 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
736 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
737 return true;
738 } else {
739 return false;
740 }
741 }
742
743 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
744 char* end;
745 errno = 0;
746 double v = strtod(value, &end);
747 if ((errno != 0) || (*end != 0)) {
748 return false;
749 }
750
751 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
752 return true;
753 }
754 return false;
755 }
756
757 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
758 julong v;
759 int int_v;
760 intx intx_v;
761 bool is_neg = false;
762 Flag* result = Flag::find_flag(name, strlen(name));
763
764 if (result == NULL) {
765 return false;
766 }
767
768 // Check the sign first since atojulong() parses only unsigned values.
769 if (*value == '-') {
770 if (!result->is_intx() && !result->is_int()) {
771 return false;
772 }
773 value++;
774 is_neg = true;
775 }
776 if (!Arguments::atojulong(value, &v)) {
777 return false;
778 }
779 if (result->is_int()) {
780 int_v = (int) v;
781 if (is_neg) {
782 int_v = -int_v;
783 }
784 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
785 } else if (result->is_uint()) {
786 uint uint_v = (uint) v;
787 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
788 } else if (result->is_intx()) {
789 intx_v = (intx) v;
790 if (is_neg) {
791 intx_v = -intx_v;
792 }
793 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
794 } else if (result->is_uintx()) {
795 uintx uintx_v = (uintx) v;
796 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
797 } else if (result->is_uint64_t()) {
798 uint64_t uint64_t_v = (uint64_t) v;
799 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
800 } else if (result->is_size_t()) {
801 size_t size_t_v = (size_t) v;
802 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
803 } else {
804 return false;
805 }
806 }
807
808 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
809 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
810 // Contract: CommandLineFlags always returns a pointer that needs freeing.
811 FREE_C_HEAP_ARRAY(char, value);
812 return true;
813 }
814
815 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
816 const char* old_value = "";
817 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
818 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
819 size_t new_len = strlen(new_value);
820 const char* value;
821 char* free_this_too = NULL;
822 if (old_len == 0) {
823 value = new_value;
824 } else if (new_len == 0) {
825 value = old_value;
826 } else {
827 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
828 // each new setting adds another LINE to the switch:
829 sprintf(buf, "%s\n%s", old_value, new_value);
830 value = buf;
831 free_this_too = buf;
832 }
833 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
834 // CommandLineFlags always returns a pointer that needs freeing.
835 FREE_C_HEAP_ARRAY(char, value);
836 if (free_this_too != NULL) {
837 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
838 FREE_C_HEAP_ARRAY(char, free_this_too);
839 }
840 return true;
841 }
842
843 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
844 const char* real_name = real_flag_name(arg);
845 JDK_Version since = JDK_Version();
846 switch (is_deprecated_flag(arg, &since)) {
847 case -1:
848 return NULL; // obsolete or expired, don't process normally
849 case 0:
850 return real_name;
851 case 1: {
852 if (warn) {
853 char version[256];
854 since.to_string(version, sizeof(version));
855 if (real_name != arg) {
856 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
857 arg, version, real_name);
858 } else {
859 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
860 arg, version);
861 }
862 }
863 return real_name;
864 }
865 }
866 ShouldNotReachHere();
867 return NULL;
868 }
869
870 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
871 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
872 // Set tagset string buffer at max size of 256, large enough for any alias tagset
873 const int max_tagset_size = 256;
874 int max_tagset_len = max_tagset_size - 1;
875 char tagset_buffer[max_tagset_size];
876 tagset_buffer[0] = '\0';
877
878 // Write tag-set for aliased logging option, in string list form
879 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
880 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
881 if (i > 0) {
882 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
883 }
884 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
885 }
886 if (!alf.exactMatch) {
887 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
888 }
889 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
890 (on) ? "+" : "-",
891 name,
892 tagset_buffer,
893 (on) ? LogLevel::name(alf.level) : "off");
894 }
895
896 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
897 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
898 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
899 if (strcmp(alf.alias_name, name) == 0) {
900 log_deprecated_flag(name, on, alf);
901 return alf;
902 }
903 }
904 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
905 return a;
906 }
907
908 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
909
910 // range of acceptable characters spelled out for portability reasons
911 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
912 #define BUFLEN 255
913 char name[BUFLEN+1];
914 char dummy;
915 const char* real_name;
916 bool warn_if_deprecated = true;
917
918 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
919 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
920 if (alf.alias_name != NULL){
921 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
922 return true;
923 }
924 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
925 if (real_name == NULL) {
926 return false;
927 }
928 return set_bool_flag(real_name, false, origin);
929 }
930 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
931 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
932 if (alf.alias_name != NULL){
933 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
934 return true;
935 }
936 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
937 if (real_name == NULL) {
938 return false;
939 }
940 return set_bool_flag(real_name, true, origin);
941 }
942
943 char punct;
944 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
945 const char* value = strchr(arg, '=') + 1;
946 Flag* flag;
947
948 // this scanf pattern matches both strings (handled here) and numbers (handled later))
949 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
950 if (alf.alias_name != NULL) {
951 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
952 return true;
953 }
954 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
955 if (real_name == NULL) {
956 return false;
957 }
958 flag = Flag::find_flag(real_name);
959 if (flag != NULL && flag->is_ccstr()) {
960 if (flag->ccstr_accumulates()) {
961 return append_to_string_flag(real_name, value, origin);
962 } else {
963 if (value[0] == '\0') {
964 value = NULL;
965 }
966 return set_string_flag(real_name, value, origin);
967 }
968 } else {
969 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
970 }
971 }
972
973 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
974 const char* value = strchr(arg, '=') + 1;
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 if (value[0] == '\0') {
977 value = NULL;
978 }
979 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
980 if (real_name == NULL) {
981 return false;
982 }
983 return set_string_flag(real_name, value, origin);
984 }
985
986 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
987 #define SIGNED_NUMBER_RANGE "[-0123456789]"
988 #define NUMBER_RANGE "[0123456789eE+-]"
989 char value[BUFLEN + 1];
990 char value2[BUFLEN + 1];
991 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
992 // Looks like a floating-point number -- try again with more lenient format string
993 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
994 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
995 if (real_name == NULL) {
996 return false;
997 }
998 return set_fp_numeric_flag(real_name, value, origin);
999 }
1000 }
1001
1002 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1003 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1004 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1005 if (real_name == NULL) {
1006 return false;
1007 }
1008 return set_numeric_flag(real_name, value, origin);
1009 }
1010
1011 return false;
1012 }
1013
1014 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1015 assert(bldarray != NULL, "illegal argument");
1016
1017 if (arg == NULL) {
1018 return;
1019 }
1020
1021 int new_count = *count + 1;
1022
1023 // expand the array and add arg to the last element
1024 if (*bldarray == NULL) {
1025 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1026 } else {
1027 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1028 }
1029 (*bldarray)[*count] = os::strdup_check_oom(arg);
1030 *count = new_count;
1031 }
1032
1033 void Arguments::build_jvm_args(const char* arg) {
1034 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1035 }
1036
1037 void Arguments::build_jvm_flags(const char* arg) {
1038 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1039 }
1040
1041 // utility function to return a string that concatenates all
1042 // strings in a given char** array
1043 const char* Arguments::build_resource_string(char** args, int count) {
1044 if (args == NULL || count == 0) {
1045 return NULL;
1046 }
1047 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1048 for (int i = 1; i < count; i++) {
1049 length += strlen(args[i]) + 1; // add 1 for a space
1050 }
1051 char* s = NEW_RESOURCE_ARRAY(char, length);
1052 strcpy(s, args[0]);
1053 for (int j = 1; j < count; j++) {
1054 strcat(s, " ");
1055 strcat(s, args[j]);
1056 }
1057 return (const char*) s;
1058 }
1059
1060 void Arguments::print_on(outputStream* st) {
1061 st->print_cr("VM Arguments:");
1062 if (num_jvm_flags() > 0) {
1063 st->print("jvm_flags: "); print_jvm_flags_on(st);
1064 st->cr();
1065 }
1066 if (num_jvm_args() > 0) {
1067 st->print("jvm_args: "); print_jvm_args_on(st);
1068 st->cr();
1069 }
1070 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1071 if (_java_class_path != NULL) {
1072 char* path = _java_class_path->value();
1073 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1074 }
1075 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1076 }
1077
1078 void Arguments::print_summary_on(outputStream* st) {
1079 // Print the command line. Environment variables that are helpful for
1080 // reproducing the problem are written later in the hs_err file.
1081 // flags are from setting file
1082 if (num_jvm_flags() > 0) {
1083 st->print_raw("Settings File: ");
1084 print_jvm_flags_on(st);
1085 st->cr();
1086 }
1087 // args are the command line and environment variable arguments.
1088 st->print_raw("Command Line: ");
1089 if (num_jvm_args() > 0) {
1090 print_jvm_args_on(st);
1091 }
1092 // this is the classfile and any arguments to the java program
1093 if (java_command() != NULL) {
1094 st->print("%s", java_command());
1095 }
1096 st->cr();
1097 }
1098
1099 void Arguments::print_jvm_flags_on(outputStream* st) {
1100 if (_num_jvm_flags > 0) {
1101 for (int i=0; i < _num_jvm_flags; i++) {
1102 st->print("%s ", _jvm_flags_array[i]);
1103 }
1104 }
1105 }
1106
1107 void Arguments::print_jvm_args_on(outputStream* st) {
1108 if (_num_jvm_args > 0) {
1109 for (int i=0; i < _num_jvm_args; i++) {
1110 st->print("%s ", _jvm_args_array[i]);
1111 }
1112 }
1113 }
1114
1115 bool Arguments::process_argument(const char* arg,
1116 jboolean ignore_unrecognized,
1117 Flag::Flags origin) {
1118 JDK_Version since = JDK_Version();
1119
1120 if (parse_argument(arg, origin)) {
1121 return true;
1122 }
1123
1124 // Determine if the flag has '+', '-', or '=' characters.
1125 bool has_plus_minus = (*arg == '+' || *arg == '-');
1126 const char* const argname = has_plus_minus ? arg + 1 : arg;
1127
1128 size_t arg_len;
1129 const char* equal_sign = strchr(argname, '=');
1130 if (equal_sign == NULL) {
1131 arg_len = strlen(argname);
1132 } else {
1133 arg_len = equal_sign - argname;
1134 }
1135
1136 // Only make the obsolete check for valid arguments.
1137 if (arg_len <= BUFLEN) {
1138 // Construct a string which consists only of the argument name without '+', '-', or '='.
1139 char stripped_argname[BUFLEN+1];
1140 strncpy(stripped_argname, argname, arg_len);
1141 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1142 if (is_obsolete_flag(stripped_argname, &since)) {
1143 char version[256];
1144 since.to_string(version, sizeof(version));
1145 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1146 return true;
1147 }
1148 #ifndef PRODUCT
1149 else {
1150 const char* replacement;
1151 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1152 log_warning(arguments)("%s has been removed. Please use %s instead.",
1153 stripped_argname,
1154 replacement);
1155 return false;
1156 }
1157 }
1158 #endif //PRODUCT
1159 }
1160
1161 // For locked flags, report a custom error message if available.
1162 // Otherwise, report the standard unrecognized VM option.
1163 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1164 if (found_flag != NULL) {
1165 char locked_message_buf[BUFLEN];
1166 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1167 if (strlen(locked_message_buf) == 0) {
1168 if (found_flag->is_bool() && !has_plus_minus) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Missing +/- setting for VM option '%s'\n", argname);
1171 } else if (!found_flag->is_bool() && has_plus_minus) {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Unexpected +/- setting in VM option '%s'\n", argname);
1174 } else {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Improperly specified VM option '%s'\n", argname);
1177 }
1178 } else {
1179 #ifdef PRODUCT
1180 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1181 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1182 if (ignore_unrecognized && mismatched) {
1183 return true;
1184 }
1185 #endif
1186 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1187 }
1188 } else {
1189 if (ignore_unrecognized) {
1190 return true;
1191 }
1192 jio_fprintf(defaultStream::error_stream(),
1193 "Unrecognized VM option '%s'\n", argname);
1194 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1195 if (fuzzy_matched != NULL) {
1196 jio_fprintf(defaultStream::error_stream(),
1197 "Did you mean '%s%s%s'? ",
1198 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1199 fuzzy_matched->_name,
1200 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1201 }
1202 }
1203
1204 // allow for commandline "commenting out" options like -XX:#+Verbose
1205 return arg[0] == '#';
1206 }
1207
1208 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1209 FILE* stream = fopen(file_name, "rb");
1210 if (stream == NULL) {
1211 if (should_exist) {
1212 jio_fprintf(defaultStream::error_stream(),
1213 "Could not open settings file %s\n", file_name);
1214 return false;
1215 } else {
1216 return true;
1217 }
1218 }
1219
1220 char token[1024];
1221 int pos = 0;
1222
1223 bool in_white_space = true;
1224 bool in_comment = false;
1225 bool in_quote = false;
1226 char quote_c = 0;
1227 bool result = true;
1228
1229 int c = getc(stream);
1230 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1231 if (in_white_space) {
1232 if (in_comment) {
1233 if (c == '\n') in_comment = false;
1234 } else {
1235 if (c == '#') in_comment = true;
1236 else if (!isspace(c)) {
1237 in_white_space = false;
1238 token[pos++] = c;
1239 }
1240 }
1241 } else {
1242 if (c == '\n' || (!in_quote && isspace(c))) {
1243 // token ends at newline, or at unquoted whitespace
1244 // this allows a way to include spaces in string-valued options
1245 token[pos] = '\0';
1246 logOption(token);
1247 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1248 build_jvm_flags(token);
1249 pos = 0;
1250 in_white_space = true;
1251 in_quote = false;
1252 } else if (!in_quote && (c == '\'' || c == '"')) {
1253 in_quote = true;
1254 quote_c = c;
1255 } else if (in_quote && (c == quote_c)) {
1256 in_quote = false;
1257 } else {
1258 token[pos++] = c;
1259 }
1260 }
1261 c = getc(stream);
1262 }
1263 if (pos > 0) {
1264 token[pos] = '\0';
1265 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1266 build_jvm_flags(token);
1267 }
1268 fclose(stream);
1269 return result;
1270 }
1271
1272 //=============================================================================================================
1273 // Parsing of properties (-D)
1274
1275 const char* Arguments::get_property(const char* key) {
1276 return PropertyList_get_value(system_properties(), key);
1277 }
1278
1279 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1280 const char* eq = strchr(prop, '=');
1281 const char* key;
1282 const char* value = "";
1283
1284 if (eq == NULL) {
1285 // property doesn't have a value, thus use passed string
1286 key = prop;
1287 } else {
1288 // property have a value, thus extract it and save to the
1289 // allocated string
1290 size_t key_len = eq - prop;
1291 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1292
1293 strncpy(tmp_key, prop, key_len);
1294 tmp_key[key_len] = '\0';
1295 key = tmp_key;
1296
1297 value = &prop[key_len + 1];
1298 }
1299
1300 if (strcmp(key, "java.compiler") == 0) {
1301 process_java_compiler_argument(value);
1302 // Record value in Arguments, but let it get passed to Java.
1303 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1304 strcmp(key, "sun.java.launcher.pid") == 0) {
1305 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1306 // private and are processed in process_sun_java_launcher_properties();
1307 // the sun.java.launcher property is passed on to the java application
1308 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1309 // append is true, writable is true, internal is false
1310 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1311 WriteableProperty, ExternalProperty);
1312 } else {
1313 if (strcmp(key, "sun.java.command") == 0) {
1314 char *old_java_command = _java_command;
1315 _java_command = os::strdup_check_oom(value, mtArguments);
1316 if (old_java_command != NULL) {
1317 os::free(old_java_command);
1318 }
1319 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1320 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1321 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1322 // its value without going through the property list or making a Java call.
1323 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1324 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1325 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1326 os::free((void *)old_java_vendor_url_bug);
1327 }
1328 }
1329
1330 // Create new property and add at the end of the list
1331 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1332 }
1333
1334 if (key != prop) {
1335 // SystemProperty copy passed value, thus free previously allocated
1336 // memory
1337 FreeHeap((void *)key);
1338 }
1339
1340 return true;
1341 }
1342
1343 // sets or adds a module name to the jdk.module.addmods property
1344 bool Arguments::append_to_addmods_property(const char* module_name) {
1345 const char* key = "jdk.module.addmods";
1346 const char* old_value = Arguments::get_property(key);
1347 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1348 if (old_value != NULL) {
1349 buf_len += strlen(old_value) + 1;
1350 }
1351 char* new_value = AllocateHeap(buf_len, mtArguments);
1352 if (new_value == NULL) {
1353 return false;
1354 }
1355 if (old_value == NULL) {
1356 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1357 } else {
1358 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1359 }
1360 bool added = add_property(new_value, UnwriteableProperty, InternalProperty);
1361 FreeHeap(new_value);
1362 return added;
1363 }
1364
1365 #if INCLUDE_CDS
1366 void Arguments::check_unsupported_dumping_properties() {
1367 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1368 const char* unsupported_properties[5] = { "jdk.module.main",
1369 "jdk.module.path",
1370 "jdk.module.upgrade.path",
1371 "jdk.module.addmods",
1372 "jdk.module.limitmods" };
1373 const char* unsupported_options[5] = { "-m",
1374 "--module-path",
1375 "--upgrade-module-path",
1376 "--add-modules",
1377 "--limit-modules" };
1378 SystemProperty* sp = system_properties();
1379 while (sp != NULL) {
1380 for (int i = 0; i < 5; i++) {
1381 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1382 vm_exit_during_initialization(
1383 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1384 }
1385 }
1386 sp = sp->next();
1387 }
1388 }
1389 #endif
1390
1391 //===========================================================================================================
1392 // Setting int/mixed/comp mode flags
1393
1394 void Arguments::set_mode_flags(Mode mode) {
1395 // Set up default values for all flags.
1396 // If you add a flag to any of the branches below,
1397 // add a default value for it here.
1398 set_java_compiler(false);
1399 _mode = mode;
1400
1401 // Ensure Agent_OnLoad has the correct initial values.
1402 // This may not be the final mode; mode may change later in onload phase.
1403 PropertyList_unique_add(&_system_properties, "java.vm.info",
1404 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1405
1406 UseInterpreter = true;
1407 UseCompiler = true;
1408 UseLoopCounter = true;
1409
1410 // Default values may be platform/compiler dependent -
1411 // use the saved values
1412 ClipInlining = Arguments::_ClipInlining;
1413 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1414 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1415 BackgroundCompilation = Arguments::_BackgroundCompilation;
1416 if (TieredCompilation) {
1417 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1418 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1419 }
1420 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1421 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1422 }
1423 }
1424
1425 // Change from defaults based on mode
1426 switch (mode) {
1427 default:
1428 ShouldNotReachHere();
1429 break;
1430 case _int:
1431 UseCompiler = false;
1432 UseLoopCounter = false;
1433 AlwaysCompileLoopMethods = false;
1434 UseOnStackReplacement = false;
1435 break;
1436 case _mixed:
1437 // same as default
1438 break;
1439 case _comp:
1440 UseInterpreter = false;
1441 BackgroundCompilation = false;
1442 ClipInlining = false;
1443 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1444 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1445 // compile a level 4 (C2) and then continue executing it.
1446 if (TieredCompilation) {
1447 Tier3InvokeNotifyFreqLog = 0;
1448 Tier4InvocationThreshold = 0;
1449 }
1450 break;
1451 }
1452 }
1453
1454 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1455 // Conflict: required to use shared spaces (-Xshare:on), but
1456 // incompatible command line options were chosen.
1457
1458 static void no_shared_spaces(const char* message) {
1459 if (RequireSharedSpaces) {
1460 jio_fprintf(defaultStream::error_stream(),
1461 "Class data sharing is inconsistent with other specified options.\n");
1462 vm_exit_during_initialization("Unable to use shared archive.", message);
1463 } else {
1464 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1465 }
1466 }
1467 #endif
1468
1469 // Returns threshold scaled with the value of scale.
1470 // If scale < 0.0, threshold is returned without scaling.
1471 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1472 if (scale == 1.0 || scale < 0.0) {
1473 return threshold;
1474 } else {
1475 return (intx)(threshold * scale);
1476 }
1477 }
1478
1479 // Returns freq_log scaled with the value of scale.
1480 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1481 // If scale < 0.0, freq_log is returned without scaling.
1482 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1483 // Check if scaling is necessary or if negative value was specified.
1484 if (scale == 1.0 || scale < 0.0) {
1485 return freq_log;
1486 }
1487 // Check values to avoid calculating log2 of 0.
1488 if (scale == 0.0 || freq_log == 0) {
1489 return 0;
1490 }
1491 // Determine the maximum notification frequency value currently supported.
1492 // The largest mask value that the interpreter/C1 can handle is
1493 // of length InvocationCounter::number_of_count_bits. Mask values are always
1494 // one bit shorter then the value of the notification frequency. Set
1495 // max_freq_bits accordingly.
1496 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1497 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1498 if (scaled_freq == 0) {
1499 // Return 0 right away to avoid calculating log2 of 0.
1500 return 0;
1501 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1502 return max_freq_bits;
1503 } else {
1504 return log2_intptr(scaled_freq);
1505 }
1506 }
1507
1508 void Arguments::set_tiered_flags() {
1509 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1510 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1511 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1512 }
1513 if (CompilationPolicyChoice < 2) {
1514 vm_exit_during_initialization(
1515 "Incompatible compilation policy selected", NULL);
1516 }
1517 // Increase the code cache size - tiered compiles a lot more.
1518 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1519 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1520 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1521 }
1522 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1523 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1524 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1525 }
1526 if (!UseInterpreter) { // -Xcomp
1527 Tier3InvokeNotifyFreqLog = 0;
1528 Tier4InvocationThreshold = 0;
1529 }
1530
1531 if (CompileThresholdScaling < 0) {
1532 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1533 }
1534
1535 // Scale tiered compilation thresholds.
1536 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1537 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1538 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1539 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1540
1541 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1542 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1543 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1544 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1545
1546 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1547 // once these thresholds become supported.
1548
1549 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1550 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1551
1552 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1553 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1554
1555 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1556
1557 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1558 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1559 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1560 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1561 }
1562 }
1563
1564 #if INCLUDE_ALL_GCS
1565 static void disable_adaptive_size_policy(const char* collector_name) {
1566 if (UseAdaptiveSizePolicy) {
1567 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1568 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1569 collector_name);
1570 }
1571 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1572 }
1573 }
1574
1575 void Arguments::set_parnew_gc_flags() {
1576 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1577 "control point invariant");
1578 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1579 assert(UseParNewGC, "ParNew should always be used with CMS");
1580
1581 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1582 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1583 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1584 } else if (ParallelGCThreads == 0) {
1585 jio_fprintf(defaultStream::error_stream(),
1586 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1587 vm_exit(1);
1588 }
1589
1590 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1591 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1592 // we set them to 1024 and 1024.
1593 // See CR 6362902.
1594 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1595 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1596 }
1597 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1598 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1599 }
1600
1601 // When using compressed oops, we use local overflow stacks,
1602 // rather than using a global overflow list chained through
1603 // the klass word of the object's pre-image.
1604 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1605 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1606 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1607 }
1608 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1609 }
1610 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1611 }
1612
1613 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1614 // sparc/solaris for certain applications, but would gain from
1615 // further optimization and tuning efforts, and would almost
1616 // certainly gain from analysis of platform and environment.
1617 void Arguments::set_cms_and_parnew_gc_flags() {
1618 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1619 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1620 assert(UseParNewGC, "ParNew should always be used with CMS");
1621
1622 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1623 disable_adaptive_size_policy("UseConcMarkSweepGC");
1624
1625 set_parnew_gc_flags();
1626
1627 size_t max_heap = align_size_down(MaxHeapSize,
1628 CardTableRS::ct_max_alignment_constraint());
1629
1630 // Now make adjustments for CMS
1631 intx tenuring_default = (intx)6;
1632 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1633
1634 // Preferred young gen size for "short" pauses:
1635 // upper bound depends on # of threads and NewRatio.
1636 const size_t preferred_max_new_size_unaligned =
1637 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1638 size_t preferred_max_new_size =
1639 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1640
1641 // Unless explicitly requested otherwise, size young gen
1642 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1643
1644 // If either MaxNewSize or NewRatio is set on the command line,
1645 // assume the user is trying to set the size of the young gen.
1646 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1647
1648 // Set MaxNewSize to our calculated preferred_max_new_size unless
1649 // NewSize was set on the command line and it is larger than
1650 // preferred_max_new_size.
1651 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1652 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1653 } else {
1654 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1655 }
1656 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1657
1658 // Code along this path potentially sets NewSize and OldSize
1659 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1660 min_heap_size(), InitialHeapSize, max_heap);
1661 size_t min_new = preferred_max_new_size;
1662 if (FLAG_IS_CMDLINE(NewSize)) {
1663 min_new = NewSize;
1664 }
1665 if (max_heap > min_new && min_heap_size() > min_new) {
1666 // Unless explicitly requested otherwise, make young gen
1667 // at least min_new, and at most preferred_max_new_size.
1668 if (FLAG_IS_DEFAULT(NewSize)) {
1669 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1670 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1671 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1672 }
1673 // Unless explicitly requested otherwise, size old gen
1674 // so it's NewRatio x of NewSize.
1675 if (FLAG_IS_DEFAULT(OldSize)) {
1676 if (max_heap > NewSize) {
1677 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1678 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1679 }
1680 }
1681 }
1682 }
1683 // Unless explicitly requested otherwise, definitely
1684 // promote all objects surviving "tenuring_default" scavenges.
1685 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1686 FLAG_IS_DEFAULT(SurvivorRatio)) {
1687 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1688 }
1689 // If we decided above (or user explicitly requested)
1690 // `promote all' (via MaxTenuringThreshold := 0),
1691 // prefer minuscule survivor spaces so as not to waste
1692 // space for (non-existent) survivors
1693 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1694 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1695 }
1696
1697 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1698 // but rather the number of free blocks of a given size that are used when
1699 // replenishing the local per-worker free list caches.
1700 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1701 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1702 // OldPLAB sizing manually turned off: Use a larger default setting,
1703 // unless it was manually specified. This is because a too-low value
1704 // will slow down scavenges.
1705 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1706 } else {
1707 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1708 }
1709 }
1710
1711 // If either of the static initialization defaults have changed, note this
1712 // modification.
1713 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1714 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1715 }
1716
1717 if (!ClassUnloading) {
1718 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1719 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1720 }
1721
1722 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1723 }
1724 #endif // INCLUDE_ALL_GCS
1725
1726 void set_object_alignment() {
1727 // Object alignment.
1728 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1729 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1730 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1731 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1732 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1733 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1734
1735 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1736 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1737
1738 // Oop encoding heap max
1739 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1740
1741 if (SurvivorAlignmentInBytes == 0) {
1742 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1743 }
1744
1745 #if INCLUDE_ALL_GCS
1746 // Set CMS global values
1747 CompactibleFreeListSpace::set_cms_values();
1748 #endif // INCLUDE_ALL_GCS
1749 }
1750
1751 size_t Arguments::max_heap_for_compressed_oops() {
1752 // Avoid sign flip.
1753 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1754 // We need to fit both the NULL page and the heap into the memory budget, while
1755 // keeping alignment constraints of the heap. To guarantee the latter, as the
1756 // NULL page is located before the heap, we pad the NULL page to the conservative
1757 // maximum alignment that the GC may ever impose upon the heap.
1758 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1759 _conservative_max_heap_alignment);
1760
1761 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1762 NOT_LP64(ShouldNotReachHere(); return 0);
1763 }
1764
1765 bool Arguments::should_auto_select_low_pause_collector() {
1766 if (UseAutoGCSelectPolicy &&
1767 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1768 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1769 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1770 return true;
1771 }
1772 return false;
1773 }
1774
1775 void Arguments::set_use_compressed_oops() {
1776 #ifndef ZERO
1777 #ifdef _LP64
1778 // MaxHeapSize is not set up properly at this point, but
1779 // the only value that can override MaxHeapSize if we are
1780 // to use UseCompressedOops is InitialHeapSize.
1781 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1782
1783 if (max_heap_size <= max_heap_for_compressed_oops()) {
1784 #if !defined(COMPILER1) || defined(TIERED)
1785 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1786 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1787 }
1788 #endif
1789 } else {
1790 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1791 warning("Max heap size too large for Compressed Oops");
1792 FLAG_SET_DEFAULT(UseCompressedOops, false);
1793 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1794 }
1795 }
1796 #endif // _LP64
1797 #endif // ZERO
1798 }
1799
1800
1801 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1802 // set_use_compressed_oops().
1803 void Arguments::set_use_compressed_klass_ptrs() {
1804 #ifndef ZERO
1805 #ifdef _LP64
1806 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1807 if (!UseCompressedOops) {
1808 if (UseCompressedClassPointers) {
1809 warning("UseCompressedClassPointers requires UseCompressedOops");
1810 }
1811 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1812 } else {
1813 // Turn on UseCompressedClassPointers too
1814 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1815 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1816 }
1817 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1818 if (UseCompressedClassPointers) {
1819 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1820 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1821 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1822 }
1823 }
1824 }
1825 #endif // _LP64
1826 #endif // !ZERO
1827 }
1828
1829 void Arguments::set_conservative_max_heap_alignment() {
1830 // The conservative maximum required alignment for the heap is the maximum of
1831 // the alignments imposed by several sources: any requirements from the heap
1832 // itself, the collector policy and the maximum page size we may run the VM
1833 // with.
1834 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1835 #if INCLUDE_ALL_GCS
1836 if (UseParallelGC) {
1837 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1838 } else if (UseG1GC) {
1839 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1840 }
1841 #endif // INCLUDE_ALL_GCS
1842 _conservative_max_heap_alignment = MAX4(heap_alignment,
1843 (size_t)os::vm_allocation_granularity(),
1844 os::max_page_size(),
1845 CollectorPolicy::compute_heap_alignment());
1846 }
1847
1848 bool Arguments::gc_selected() {
1849 #if INCLUDE_ALL_GCS
1850 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1851 #else
1852 return UseSerialGC;
1853 #endif // INCLUDE_ALL_GCS
1854 }
1855
1856 void Arguments::select_gc_ergonomically() {
1857 #if INCLUDE_ALL_GCS
1858 if (os::is_server_class_machine()) {
1859 if (should_auto_select_low_pause_collector()) {
1860 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1861 } else {
1862 #if defined(JAVASE_EMBEDDED)
1863 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1864 #else
1865 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1866 #endif
1867 }
1868 } else {
1869 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1870 }
1871 #else
1872 UNSUPPORTED_OPTION(UseG1GC);
1873 UNSUPPORTED_OPTION(UseParallelGC);
1874 UNSUPPORTED_OPTION(UseParallelOldGC);
1875 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1876 UNSUPPORTED_OPTION(UseParNewGC);
1877 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1878 #endif // INCLUDE_ALL_GCS
1879 }
1880
1881 void Arguments::select_gc() {
1882 if (!gc_selected()) {
1883 select_gc_ergonomically();
1884 if (!gc_selected()) {
1885 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1886 }
1887 }
1888 }
1889
1890 void Arguments::set_ergonomics_flags() {
1891 select_gc();
1892
1893 #if defined(COMPILER2) || INCLUDE_JVMCI
1894 // Shared spaces work fine with other GCs but causes bytecode rewriting
1895 // to be disabled, which hurts interpreter performance and decreases
1896 // server performance. When -server is specified, keep the default off
1897 // unless it is asked for. Future work: either add bytecode rewriting
1898 // at link time, or rewrite bytecodes in non-shared methods.
1899 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1900 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1901 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1902 }
1903 #endif
1904
1905 set_conservative_max_heap_alignment();
1906
1907 #ifndef ZERO
1908 #ifdef _LP64
1909 set_use_compressed_oops();
1910
1911 // set_use_compressed_klass_ptrs() must be called after calling
1912 // set_use_compressed_oops().
1913 set_use_compressed_klass_ptrs();
1914
1915 // Also checks that certain machines are slower with compressed oops
1916 // in vm_version initialization code.
1917 #endif // _LP64
1918 #endif // !ZERO
1919
1920 CodeCacheExtensions::set_ergonomics_flags();
1921 }
1922
1923 void Arguments::set_parallel_gc_flags() {
1924 assert(UseParallelGC || UseParallelOldGC, "Error");
1925 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1926 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1927 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1928 }
1929 FLAG_SET_DEFAULT(UseParallelGC, true);
1930
1931 // If no heap maximum was requested explicitly, use some reasonable fraction
1932 // of the physical memory, up to a maximum of 1GB.
1933 FLAG_SET_DEFAULT(ParallelGCThreads,
1934 Abstract_VM_Version::parallel_worker_threads());
1935 if (ParallelGCThreads == 0) {
1936 jio_fprintf(defaultStream::error_stream(),
1937 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1938 vm_exit(1);
1939 }
1940
1941 if (UseAdaptiveSizePolicy) {
1942 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1943 // unless the user actually sets these flags.
1944 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1945 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1946 }
1947 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1948 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1949 }
1950 }
1951
1952 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1953 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1954 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1955 // See CR 6362902 for details.
1956 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1957 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1958 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1959 }
1960 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1961 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1962 }
1963 }
1964
1965 if (UseParallelOldGC) {
1966 // Par compact uses lower default values since they are treated as
1967 // minimums. These are different defaults because of the different
1968 // interpretation and are not ergonomically set.
1969 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1970 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1971 }
1972 }
1973 }
1974
1975 void Arguments::set_g1_gc_flags() {
1976 assert(UseG1GC, "Error");
1977 #if defined(COMPILER1) || INCLUDE_JVMCI
1978 FastTLABRefill = false;
1979 #endif
1980 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1981 if (ParallelGCThreads == 0) {
1982 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1983 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1984 }
1985
1986 #if INCLUDE_ALL_GCS
1987 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1988 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1989 }
1990 #endif
1991
1992 // MarkStackSize will be set (if it hasn't been set by the user)
1993 // when concurrent marking is initialized.
1994 // Its value will be based upon the number of parallel marking threads.
1995 // But we do set the maximum mark stack size here.
1996 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1997 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1998 }
1999
2000 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2001 // In G1, we want the default GC overhead goal to be higher than
2002 // it is for PS, or the heap might be expanded too aggressively.
2003 // We set it here to ~8%.
2004 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2005 }
2006
2007 // Below, we might need to calculate the pause time interval based on
2008 // the pause target. When we do so we are going to give G1 maximum
2009 // flexibility and allow it to do pauses when it needs to. So, we'll
2010 // arrange that the pause interval to be pause time target + 1 to
2011 // ensure that a) the pause time target is maximized with respect to
2012 // the pause interval and b) we maintain the invariant that pause
2013 // time target < pause interval. If the user does not want this
2014 // maximum flexibility, they will have to set the pause interval
2015 // explicitly.
2016
2017 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
2018 // The default pause time target in G1 is 200ms
2019 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
2020 }
2021
2022 // Then, if the interval parameter was not set, set it according to
2023 // the pause time target (this will also deal with the case when the
2024 // pause time target is the default value).
2025 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
2026 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
2027 }
2028
2029 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2030 }
2031
2032 void Arguments::set_gc_specific_flags() {
2033 #if INCLUDE_ALL_GCS
2034 // Set per-collector flags
2035 if (UseParallelGC || UseParallelOldGC) {
2036 set_parallel_gc_flags();
2037 } else if (UseConcMarkSweepGC) {
2038 set_cms_and_parnew_gc_flags();
2039 } else if (UseG1GC) {
2040 set_g1_gc_flags();
2041 }
2042 if (AssumeMP && !UseSerialGC) {
2043 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2044 warning("If the number of processors is expected to increase from one, then"
2045 " you should configure the number of parallel GC threads appropriately"
2046 " using -XX:ParallelGCThreads=N");
2047 }
2048 }
2049 if (MinHeapFreeRatio == 100) {
2050 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2051 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2052 }
2053 #endif // INCLUDE_ALL_GCS
2054 }
2055
2056 julong Arguments::limit_by_allocatable_memory(julong limit) {
2057 julong max_allocatable;
2058 julong result = limit;
2059 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2060 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2061 }
2062 return result;
2063 }
2064
2065 // Use static initialization to get the default before parsing
2066 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2067
2068 void Arguments::set_heap_size() {
2069 const julong phys_mem =
2070 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2071 : (julong)MaxRAM;
2072
2073 // If the maximum heap size has not been set with -Xmx,
2074 // then set it as fraction of the size of physical memory,
2075 // respecting the maximum and minimum sizes of the heap.
2076 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2077 julong reasonable_max = phys_mem / MaxRAMFraction;
2078
2079 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2080 // Small physical memory, so use a minimum fraction of it for the heap
2081 reasonable_max = phys_mem / MinRAMFraction;
2082 } else {
2083 // Not-small physical memory, so require a heap at least
2084 // as large as MaxHeapSize
2085 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2086 }
2087 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2088 // Limit the heap size to ErgoHeapSizeLimit
2089 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2090 }
2091 if (UseCompressedOops) {
2092 // Limit the heap size to the maximum possible when using compressed oops
2093 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2094
2095 // HeapBaseMinAddress can be greater than default but not less than.
2096 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2097 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2098 // matches compressed oops printing flags
2099 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2100 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2101 DefaultHeapBaseMinAddress,
2102 DefaultHeapBaseMinAddress/G,
2103 HeapBaseMinAddress);
2104 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2105 }
2106 }
2107
2108 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2109 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2110 // but it should be not less than default MaxHeapSize.
2111 max_coop_heap -= HeapBaseMinAddress;
2112 }
2113 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2114 }
2115 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2116
2117 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2118 // An initial heap size was specified on the command line,
2119 // so be sure that the maximum size is consistent. Done
2120 // after call to limit_by_allocatable_memory because that
2121 // method might reduce the allocation size.
2122 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2123 }
2124
2125 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2126 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2127 }
2128
2129 // If the minimum or initial heap_size have not been set or requested to be set
2130 // ergonomically, set them accordingly.
2131 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2132 julong reasonable_minimum = (julong)(OldSize + NewSize);
2133
2134 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2135
2136 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2137
2138 if (InitialHeapSize == 0) {
2139 julong reasonable_initial = phys_mem / InitialRAMFraction;
2140
2141 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2142 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2143
2144 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2145
2146 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2147 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2148 }
2149 // If the minimum heap size has not been set (via -Xms),
2150 // synchronize with InitialHeapSize to avoid errors with the default value.
2151 if (min_heap_size() == 0) {
2152 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2153 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2154 }
2155 }
2156 }
2157
2158 // This option inspects the machine and attempts to set various
2159 // parameters to be optimal for long-running, memory allocation
2160 // intensive jobs. It is intended for machines with large
2161 // amounts of cpu and memory.
2162 jint Arguments::set_aggressive_heap_flags() {
2163 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2164 // VM, but we may not be able to represent the total physical memory
2165 // available (like having 8gb of memory on a box but using a 32bit VM).
2166 // Thus, we need to make sure we're using a julong for intermediate
2167 // calculations.
2168 julong initHeapSize;
2169 julong total_memory = os::physical_memory();
2170
2171 if (total_memory < (julong) 256 * M) {
2172 jio_fprintf(defaultStream::error_stream(),
2173 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2174 vm_exit(1);
2175 }
2176
2177 // The heap size is half of available memory, or (at most)
2178 // all of possible memory less 160mb (leaving room for the OS
2179 // when using ISM). This is the maximum; because adaptive sizing
2180 // is turned on below, the actual space used may be smaller.
2181
2182 initHeapSize = MIN2(total_memory / (julong) 2,
2183 total_memory - (julong) 160 * M);
2184
2185 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2186
2187 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2188 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2189 return JNI_EINVAL;
2190 }
2191 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2192 return JNI_EINVAL;
2193 }
2194 // Currently the minimum size and the initial heap sizes are the same.
2195 set_min_heap_size(initHeapSize);
2196 }
2197 if (FLAG_IS_DEFAULT(NewSize)) {
2198 // Make the young generation 3/8ths of the total heap.
2199 if (FLAG_SET_CMDLINE(size_t, NewSize,
2200 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2201 return JNI_EINVAL;
2202 }
2203 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2204 return JNI_EINVAL;
2205 }
2206 }
2207
2208 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2209 FLAG_SET_DEFAULT(UseLargePages, true);
2210 #endif
2211
2212 // Increase some data structure sizes for efficiency
2213 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2214 return JNI_EINVAL;
2215 }
2216 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2217 return JNI_EINVAL;
2218 }
2219 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2220 return JNI_EINVAL;
2221 }
2222
2223 // See the OldPLABSize comment below, but replace 'after promotion'
2224 // with 'after copying'. YoungPLABSize is the size of the survivor
2225 // space per-gc-thread buffers. The default is 4kw.
2226 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2227 return JNI_EINVAL;
2228 }
2229
2230 // OldPLABSize is the size of the buffers in the old gen that
2231 // UseParallelGC uses to promote live data that doesn't fit in the
2232 // survivor spaces. At any given time, there's one for each gc thread.
2233 // The default size is 1kw. These buffers are rarely used, since the
2234 // survivor spaces are usually big enough. For specjbb, however, there
2235 // are occasions when there's lots of live data in the young gen
2236 // and we end up promoting some of it. We don't have a definite
2237 // explanation for why bumping OldPLABSize helps, but the theory
2238 // is that a bigger PLAB results in retaining something like the
2239 // original allocation order after promotion, which improves mutator
2240 // locality. A minor effect may be that larger PLABs reduce the
2241 // number of PLAB allocation events during gc. The value of 8kw
2242 // was arrived at by experimenting with specjbb.
2243 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2244 return JNI_EINVAL;
2245 }
2246
2247 // Enable parallel GC and adaptive generation sizing
2248 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2249 return JNI_EINVAL;
2250 }
2251 FLAG_SET_DEFAULT(ParallelGCThreads,
2252 Abstract_VM_Version::parallel_worker_threads());
2253
2254 // Encourage steady state memory management
2255 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2256 return JNI_EINVAL;
2257 }
2258
2259 // This appears to improve mutator locality
2260 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2261 return JNI_EINVAL;
2262 }
2263
2264 // Get around early Solaris scheduling bug
2265 // (affinity vs other jobs on system)
2266 // but disallow DR and offlining (5008695).
2267 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2268 return JNI_EINVAL;
2269 }
2270
2271 return JNI_OK;
2272 }
2273
2274 // This must be called after ergonomics.
2275 void Arguments::set_bytecode_flags() {
2276 if (!RewriteBytecodes) {
2277 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2278 }
2279 }
2280
2281 // Aggressive optimization flags -XX:+AggressiveOpts
2282 jint Arguments::set_aggressive_opts_flags() {
2283 #ifdef COMPILER2
2284 if (AggressiveUnboxing) {
2285 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2286 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2287 } else if (!EliminateAutoBox) {
2288 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2289 AggressiveUnboxing = false;
2290 }
2291 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2292 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2293 } else if (!DoEscapeAnalysis) {
2294 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2295 AggressiveUnboxing = false;
2296 }
2297 }
2298 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2299 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2300 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2301 }
2302 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2303 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2304 }
2305
2306 // Feed the cache size setting into the JDK
2307 char buffer[1024];
2308 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2309 if (!add_property(buffer)) {
2310 return JNI_ENOMEM;
2311 }
2312 }
2313 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2314 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2315 }
2316 #endif
2317
2318 if (AggressiveOpts) {
2319 // Sample flag setting code
2320 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2321 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2322 // }
2323 }
2324
2325 return JNI_OK;
2326 }
2327
2328 //===========================================================================================================
2329 // Parsing of java.compiler property
2330
2331 void Arguments::process_java_compiler_argument(const char* arg) {
2332 // For backwards compatibility, Djava.compiler=NONE or ""
2333 // causes us to switch to -Xint mode UNLESS -Xdebug
2334 // is also specified.
2335 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2336 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2337 }
2338 }
2339
2340 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2341 _sun_java_launcher = os::strdup_check_oom(launcher);
2342 }
2343
2344 bool Arguments::created_by_java_launcher() {
2345 assert(_sun_java_launcher != NULL, "property must have value");
2346 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2347 }
2348
2349 bool Arguments::sun_java_launcher_is_altjvm() {
2350 return _sun_java_launcher_is_altjvm;
2351 }
2352
2353 //===========================================================================================================
2354 // Parsing of main arguments
2355
2356 #if INCLUDE_JVMCI
2357 // Check consistency of jvmci vm argument settings.
2358 bool Arguments::check_jvmci_args_consistency() {
2359 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2360 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2361 return false;
2362 }
2363 return true;
2364 }
2365 #endif //INCLUDE_JVMCI
2366
2367 // Check consistency of GC selection
2368 bool Arguments::check_gc_consistency() {
2369 // Ensure that the user has not selected conflicting sets
2370 // of collectors.
2371 uint i = 0;
2372 if (UseSerialGC) i++;
2373 if (UseConcMarkSweepGC) i++;
2374 if (UseParallelGC || UseParallelOldGC) i++;
2375 if (UseG1GC) i++;
2376 if (i > 1) {
2377 jio_fprintf(defaultStream::error_stream(),
2378 "Conflicting collector combinations in option list; "
2379 "please refer to the release notes for the combinations "
2380 "allowed\n");
2381 return false;
2382 }
2383
2384 if (UseConcMarkSweepGC && !UseParNewGC) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2387 return false;
2388 }
2389
2390 if (UseParNewGC && !UseConcMarkSweepGC) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2393 return false;
2394 }
2395
2396 return true;
2397 }
2398
2399 // Check the consistency of vm_init_args
2400 bool Arguments::check_vm_args_consistency() {
2401 // Method for adding checks for flag consistency.
2402 // The intent is to warn the user of all possible conflicts,
2403 // before returning an error.
2404 // Note: Needs platform-dependent factoring.
2405 bool status = true;
2406
2407 if (TLABRefillWasteFraction == 0) {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "TLABRefillWasteFraction should be a denominator, "
2410 "not " SIZE_FORMAT "\n",
2411 TLABRefillWasteFraction);
2412 status = false;
2413 }
2414
2415 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2416 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2417 }
2418
2419 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2420 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2421 }
2422
2423 if (GCTimeLimit == 100) {
2424 // Turn off gc-overhead-limit-exceeded checks
2425 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2426 }
2427
2428 status = status && check_gc_consistency();
2429
2430 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2431 // insists that we hold the requisite locks so that the iteration is
2432 // MT-safe. For the verification at start-up and shut-down, we don't
2433 // yet have a good way of acquiring and releasing these locks,
2434 // which are not visible at the CollectedHeap level. We want to
2435 // be able to acquire these locks and then do the iteration rather
2436 // than just disable the lock verification. This will be fixed under
2437 // bug 4788986.
2438 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2439 if (VerifyDuringStartup) {
2440 warning("Heap verification at start-up disabled "
2441 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2442 VerifyDuringStartup = false; // Disable verification at start-up
2443 }
2444
2445 if (VerifyBeforeExit) {
2446 warning("Heap verification at shutdown disabled "
2447 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2448 VerifyBeforeExit = false; // Disable verification at shutdown
2449 }
2450 }
2451
2452 if (PrintNMTStatistics) {
2453 #if INCLUDE_NMT
2454 if (MemTracker::tracking_level() == NMT_off) {
2455 #endif // INCLUDE_NMT
2456 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2457 PrintNMTStatistics = false;
2458 #if INCLUDE_NMT
2459 }
2460 #endif
2461 }
2462 #if INCLUDE_JVMCI
2463
2464 status = status && check_jvmci_args_consistency();
2465
2466 if (EnableJVMCI) {
2467 if (!ScavengeRootsInCode) {
2468 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2469 ScavengeRootsInCode = 1;
2470 }
2471 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2472 TypeProfileLevel = 0;
2473 }
2474 if (UseJVMCICompiler) {
2475 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2476 TypeProfileWidth = 8;
2477 }
2478 }
2479 }
2480 #endif
2481
2482 // Check lower bounds of the code cache
2483 // Template Interpreter code is approximately 3X larger in debug builds.
2484 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2485 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2488 os::vm_page_size()/K);
2489 status = false;
2490 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2493 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2494 status = false;
2495 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2498 min_code_cache_size/K);
2499 status = false;
2500 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2501 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2502 jio_fprintf(defaultStream::error_stream(),
2503 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2504 CODE_CACHE_SIZE_LIMIT/M);
2505 status = false;
2506 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2507 jio_fprintf(defaultStream::error_stream(),
2508 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2509 min_code_cache_size/K);
2510 status = false;
2511 }
2512
2513 #ifdef _LP64
2514 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2515 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2516 }
2517 #endif
2518
2519 #ifndef SUPPORT_RESERVED_STACK_AREA
2520 if (StackReservedPages != 0) {
2521 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2522 warning("Reserved Stack Area not supported on this platform");
2523 }
2524 #endif
2525
2526 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2527 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2528 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2529 }
2530 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2531 }
2532 if (UseCompiler && is_interpreter_only()) {
2533 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2534 warning("UseCompiler disabled due to -Xint.");
2535 }
2536 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2537 }
2538 #ifdef COMPILER2
2539 if (PostLoopMultiversioning && !RangeCheckElimination) {
2540 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2541 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2542 }
2543 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2544 }
2545 #endif
2546 return status;
2547 }
2548
2549 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2550 const char* option_type) {
2551 if (ignore) return false;
2552
2553 const char* spacer = " ";
2554 if (option_type == NULL) {
2555 option_type = ++spacer; // Set both to the empty string.
2556 }
2557
2558 if (os::obsolete_option(option)) {
2559 jio_fprintf(defaultStream::error_stream(),
2560 "Obsolete %s%soption: %s\n", option_type, spacer,
2561 option->optionString);
2562 return false;
2563 } else {
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Unrecognized %s%soption: %s\n", option_type, spacer,
2566 option->optionString);
2567 return true;
2568 }
2569 }
2570
2571 static const char* user_assertion_options[] = {
2572 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2573 };
2574
2575 static const char* system_assertion_options[] = {
2576 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2577 };
2578
2579 bool Arguments::parse_uintx(const char* value,
2580 uintx* uintx_arg,
2581 uintx min_size) {
2582
2583 // Check the sign first since atojulong() parses only unsigned values.
2584 bool value_is_positive = !(*value == '-');
2585
2586 if (value_is_positive) {
2587 julong n;
2588 bool good_return = atojulong(value, &n);
2589 if (good_return) {
2590 bool above_minimum = n >= min_size;
2591 bool value_is_too_large = n > max_uintx;
2592
2593 if (above_minimum && !value_is_too_large) {
2594 *uintx_arg = n;
2595 return true;
2596 }
2597 }
2598 }
2599 return false;
2600 }
2601
2602 unsigned int addreads_count = 0;
2603 unsigned int addexports_count = 0;
2604 unsigned int patch_mod_count = 0;
2605 const char* add_modules_value = NULL;
2606
2607 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2608 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2609 char* property = AllocateHeap(prop_len, mtArguments);
2610 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2611 if (ret < 0 || ret >= (int)prop_len) {
2612 FreeHeap(property);
2613 return false;
2614 }
2615 bool added = add_property(property, UnwriteableProperty, internal);
2616 FreeHeap(property);
2617 return added;
2618 }
2619
2620 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2621 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2622 if (count < 1000) {
2623 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2624 char* property = AllocateHeap(prop_len, mtArguments);
2625 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2626 if (ret < 0 || ret >= (int)prop_len) {
2627 FreeHeap(property);
2628 return false;
2629 }
2630 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2631 FreeHeap(property);
2632 return added;
2633 }
2634 return false;
2635 }
2636
2637 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2638 julong* long_arg,
2639 julong min_size) {
2640 if (!atojulong(s, long_arg)) return arg_unreadable;
2641 return check_memory_size(*long_arg, min_size);
2642 }
2643
2644 // Parse JavaVMInitArgs structure
2645
2646 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2647 const JavaVMInitArgs *java_options_args,
2648 const JavaVMInitArgs *cmd_line_args) {
2649 bool patch_mod_javabase = false;
2650
2651 // Save default settings for some mode flags
2652 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2653 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2654 Arguments::_ClipInlining = ClipInlining;
2655 Arguments::_BackgroundCompilation = BackgroundCompilation;
2656 if (TieredCompilation) {
2657 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2658 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2659 }
2660
2661 // Setup flags for mixed which is the default
2662 set_mode_flags(_mixed);
2663
2664 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2665 // variable (if present).
2666 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2667 if (result != JNI_OK) {
2668 return result;
2669 }
2670
2671 // Parse args structure generated from the command line flags.
2672 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2673 if (result != JNI_OK) {
2674 return result;
2675 }
2676
2677 // Parse args structure generated from the _JAVA_OPTIONS environment
2678 // variable (if present) (mimics classic VM)
2679 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2680 if (result != JNI_OK) {
2681 return result;
2682 }
2683
2684 // Do final processing now that all arguments have been parsed
2685 result = finalize_vm_init_args();
2686 if (result != JNI_OK) {
2687 return result;
2688 }
2689
2690 return JNI_OK;
2691 }
2692
2693 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2694 // represents a valid JDWP agent. is_path==true denotes that we
2695 // are dealing with -agentpath (case where name is a path), otherwise with
2696 // -agentlib
2697 bool valid_jdwp_agent(char *name, bool is_path) {
2698 char *_name;
2699 const char *_jdwp = "jdwp";
2700 size_t _len_jdwp, _len_prefix;
2701
2702 if (is_path) {
2703 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2704 return false;
2705 }
2706
2707 _name++; // skip past last path separator
2708 _len_prefix = strlen(JNI_LIB_PREFIX);
2709
2710 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2711 return false;
2712 }
2713
2714 _name += _len_prefix;
2715 _len_jdwp = strlen(_jdwp);
2716
2717 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2718 _name += _len_jdwp;
2719 }
2720 else {
2721 return false;
2722 }
2723
2724 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2725 return false;
2726 }
2727
2728 return true;
2729 }
2730
2731 if (strcmp(name, _jdwp) == 0) {
2732 return true;
2733 }
2734
2735 return false;
2736 }
2737
2738 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2739 // --patch-module=<module>=<file>(<pathsep><file>)*
2740 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2741 // Find the equal sign between the module name and the path specification
2742 const char* module_equal = strchr(patch_mod_tail, '=');
2743 if (module_equal == NULL) {
2744 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2745 return JNI_ERR;
2746 } else {
2747 // Pick out the module name
2748 size_t module_len = module_equal - patch_mod_tail;
2749 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2750 if (module_name != NULL) {
2751 memcpy(module_name, patch_mod_tail, module_len);
2752 *(module_name + module_len) = '\0';
2753 // The path piece begins one past the module_equal sign
2754 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2755 FREE_C_HEAP_ARRAY(char, module_name);
2756 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2757 return JNI_ENOMEM;
2758 }
2759 } else {
2760 return JNI_ENOMEM;
2761 }
2762 }
2763 return JNI_OK;
2764 }
2765
2766 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2767 // For match_option to return remaining or value part of option string
2768 const char* tail;
2769
2770 // iterate over arguments
2771 for (int index = 0; index < args->nOptions; index++) {
2772 bool is_absolute_path = false; // for -agentpath vs -agentlib
2773
2774 const JavaVMOption* option = args->options + index;
2775
2776 if (!match_option(option, "-Djava.class.path", &tail) &&
2777 !match_option(option, "-Dsun.java.command", &tail) &&
2778 !match_option(option, "-Dsun.java.launcher", &tail)) {
2779
2780 // add all jvm options to the jvm_args string. This string
2781 // is used later to set the java.vm.args PerfData string constant.
2782 // the -Djava.class.path and the -Dsun.java.command options are
2783 // omitted from jvm_args string as each have their own PerfData
2784 // string constant object.
2785 build_jvm_args(option->optionString);
2786 }
2787
2788 // -verbose:[class/gc/jni]
2789 if (match_option(option, "-verbose", &tail)) {
2790 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2791 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2792 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2793 } else if (!strcmp(tail, ":gc")) {
2794 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2795 } else if (!strcmp(tail, ":jni")) {
2796 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 }
2800 // -da / -ea / -disableassertions / -enableassertions
2801 // These accept an optional class/package name separated by a colon, e.g.,
2802 // -da:java.lang.Thread.
2803 } else if (match_option(option, user_assertion_options, &tail, true)) {
2804 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2805 if (*tail == '\0') {
2806 JavaAssertions::setUserClassDefault(enable);
2807 } else {
2808 assert(*tail == ':', "bogus match by match_option()");
2809 JavaAssertions::addOption(tail + 1, enable);
2810 }
2811 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2812 } else if (match_option(option, system_assertion_options, &tail, false)) {
2813 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2814 JavaAssertions::setSystemClassDefault(enable);
2815 // -bootclasspath:
2816 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2817 jio_fprintf(defaultStream::output_stream(),
2818 "-Xbootclasspath is no longer a supported option.\n");
2819 return JNI_EINVAL;
2820 // -bootclasspath/a:
2821 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2822 Arguments::set_bootclassloader_append_index((int)strlen(Arguments::get_sysclasspath())+1);
2823 Arguments::append_sysclasspath(tail);
2824 // -bootclasspath/p:
2825 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2826 jio_fprintf(defaultStream::output_stream(),
2827 "-Xbootclasspath/p is no longer a supported option.\n");
2828 return JNI_EINVAL;
2829 // -Xrun
2830 } else if (match_option(option, "-Xrun", &tail)) {
2831 if (tail != NULL) {
2832 const char* pos = strchr(tail, ':');
2833 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2834 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2835 name[len] = '\0';
2836
2837 char *options = NULL;
2838 if(pos != NULL) {
2839 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2840 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2841 }
2842 #if !INCLUDE_JVMTI
2843 if (strcmp(name, "jdwp") == 0) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Debugging agents are not supported in this VM\n");
2846 return JNI_ERR;
2847 }
2848 #endif // !INCLUDE_JVMTI
2849 add_init_library(name, options);
2850 }
2851 } else if (match_option(option, "--add-reads=", &tail)) {
2852 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2853 return JNI_ENOMEM;
2854 }
2855 } else if (match_option(option, "--add-exports=", &tail)) {
2856 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2857 return JNI_ENOMEM;
2858 }
2859 } else if (match_option(option, "--add-modules=", &tail)) {
2860 add_modules_value = tail;
2861 } else if (match_option(option, "--limit-modules=", &tail)) {
2862 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2863 return JNI_ENOMEM;
2864 }
2865 } else if (match_option(option, "--module-path=", &tail)) {
2866 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2867 return JNI_ENOMEM;
2868 }
2869 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2870 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2871 return JNI_ENOMEM;
2872 }
2873 } else if (match_option(option, "--patch-module=", &tail)) {
2874 // --patch-module=<module>=<file>(<pathsep><file>)*
2875 int res = process_patch_mod_option(tail, patch_mod_javabase);
2876 if (res != JNI_OK) {
2877 return res;
2878 }
2879 // -agentlib and -agentpath
2880 } else if (match_option(option, "-agentlib:", &tail) ||
2881 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2882 if(tail != NULL) {
2883 const char* pos = strchr(tail, '=');
2884 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2885 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2886 name[len] = '\0';
2887
2888 char *options = NULL;
2889 if(pos != NULL) {
2890 options = os::strdup_check_oom(pos + 1, mtArguments);
2891 }
2892 #if !INCLUDE_JVMTI
2893 if (valid_jdwp_agent(name, is_absolute_path)) {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Debugging agents are not supported in this VM\n");
2896 return JNI_ERR;
2897 }
2898 #endif // !INCLUDE_JVMTI
2899 add_init_agent(name, options, is_absolute_path);
2900 }
2901 // -javaagent
2902 } else if (match_option(option, "-javaagent:", &tail)) {
2903 #if !INCLUDE_JVMTI
2904 jio_fprintf(defaultStream::error_stream(),
2905 "Instrumentation agents are not supported in this VM\n");
2906 return JNI_ERR;
2907 #else
2908 if (tail != NULL) {
2909 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2910 add_init_agent("instrument", options, false);
2911 // java agents need module java.instrument
2912 if (!Arguments::append_to_addmods_property("java.instrument")) {
2913 return JNI_ENOMEM;
2914 }
2915 }
2916 #endif // !INCLUDE_JVMTI
2917 // -Xnoclassgc
2918 } else if (match_option(option, "-Xnoclassgc")) {
2919 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 // -Xconcgc
2923 } else if (match_option(option, "-Xconcgc")) {
2924 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 // -Xnoconcgc
2928 } else if (match_option(option, "-Xnoconcgc")) {
2929 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 // -Xbatch
2933 } else if (match_option(option, "-Xbatch")) {
2934 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 // -Xmn for compatibility with other JVM vendors
2938 } else if (match_option(option, "-Xmn", &tail)) {
2939 julong long_initial_young_size = 0;
2940 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2941 if (errcode != arg_in_range) {
2942 jio_fprintf(defaultStream::error_stream(),
2943 "Invalid initial young generation size: %s\n", option->optionString);
2944 describe_range_error(errcode);
2945 return JNI_EINVAL;
2946 }
2947 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 // -Xms
2954 } else if (match_option(option, "-Xms", &tail)) {
2955 julong long_initial_heap_size = 0;
2956 // an initial heap size of 0 means automatically determine
2957 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2958 if (errcode != arg_in_range) {
2959 jio_fprintf(defaultStream::error_stream(),
2960 "Invalid initial heap size: %s\n", option->optionString);
2961 describe_range_error(errcode);
2962 return JNI_EINVAL;
2963 }
2964 set_min_heap_size((size_t)long_initial_heap_size);
2965 // Currently the minimum size and the initial heap sizes are the same.
2966 // Can be overridden with -XX:InitialHeapSize.
2967 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2968 return JNI_EINVAL;
2969 }
2970 // -Xmx
2971 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2972 julong long_max_heap_size = 0;
2973 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2974 if (errcode != arg_in_range) {
2975 jio_fprintf(defaultStream::error_stream(),
2976 "Invalid maximum heap size: %s\n", option->optionString);
2977 describe_range_error(errcode);
2978 return JNI_EINVAL;
2979 }
2980 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2981 return JNI_EINVAL;
2982 }
2983 // Xmaxf
2984 } else if (match_option(option, "-Xmaxf", &tail)) {
2985 char* err;
2986 int maxf = (int)(strtod(tail, &err) * 100);
2987 if (*err != '\0' || *tail == '\0') {
2988 jio_fprintf(defaultStream::error_stream(),
2989 "Bad max heap free percentage size: %s\n",
2990 option->optionString);
2991 return JNI_EINVAL;
2992 } else {
2993 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 }
2997 // Xminf
2998 } else if (match_option(option, "-Xminf", &tail)) {
2999 char* err;
3000 int minf = (int)(strtod(tail, &err) * 100);
3001 if (*err != '\0' || *tail == '\0') {
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Bad min heap free percentage size: %s\n",
3004 option->optionString);
3005 return JNI_EINVAL;
3006 } else {
3007 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 }
3011 // -Xss
3012 } else if (match_option(option, "-Xss", &tail)) {
3013 julong long_ThreadStackSize = 0;
3014 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3015 if (errcode != arg_in_range) {
3016 jio_fprintf(defaultStream::error_stream(),
3017 "Invalid thread stack size: %s\n", option->optionString);
3018 describe_range_error(errcode);
3019 return JNI_EINVAL;
3020 }
3021 // Internally track ThreadStackSize in units of 1024 bytes.
3022 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3023 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3027 } else if (match_option(option, "-Xoss", &tail) ||
3028 match_option(option, "-Xsqnopause") ||
3029 match_option(option, "-Xoptimize") ||
3030 match_option(option, "-Xboundthreads") ||
3031 match_option(option, "-Xusealtsigs")) {
3032 // All these options are deprecated in JDK 9 and will be removed in a future release
3033 char version[256];
3034 JDK_Version::jdk(9).to_string(version, sizeof(version));
3035 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3036 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3037 julong long_CodeCacheExpansionSize = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3042 os::vm_page_size()/K);
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3049 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3050 julong long_ReservedCodeCacheSize = 0;
3051
3052 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3053 if (errcode != arg_in_range) {
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Invalid maximum code cache size: %s.\n", option->optionString);
3056 return JNI_EINVAL;
3057 }
3058 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 // -XX:NonNMethodCodeHeapSize=
3062 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3063 julong long_NonNMethodCodeHeapSize = 0;
3064
3065 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3066 if (errcode != arg_in_range) {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 // -XX:ProfiledCodeHeapSize=
3075 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3076 julong long_ProfiledCodeHeapSize = 0;
3077
3078 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3079 if (errcode != arg_in_range) {
3080 jio_fprintf(defaultStream::error_stream(),
3081 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3082 return JNI_EINVAL;
3083 }
3084 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 // -XX:NonProfiledCodeHeapSizee=
3088 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3089 julong long_NonProfiledCodeHeapSize = 0;
3090
3091 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3092 if (errcode != arg_in_range) {
3093 jio_fprintf(defaultStream::error_stream(),
3094 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3095 return JNI_EINVAL;
3096 }
3097 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 // -green
3101 } else if (match_option(option, "-green")) {
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Green threads support not available\n");
3104 return JNI_EINVAL;
3105 // -native
3106 } else if (match_option(option, "-native")) {
3107 // HotSpot always uses native threads, ignore silently for compatibility
3108 // -Xrs
3109 } else if (match_option(option, "-Xrs")) {
3110 // Classic/EVM option, new functionality
3111 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3112 return JNI_EINVAL;
3113 }
3114 // -Xprof
3115 } else if (match_option(option, "-Xprof")) {
3116 #if INCLUDE_FPROF
3117 _has_profile = true;
3118 #else // INCLUDE_FPROF
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Flat profiling is not supported in this VM.\n");
3121 return JNI_ERR;
3122 #endif // INCLUDE_FPROF
3123 // -Xconcurrentio
3124 } else if (match_option(option, "-Xconcurrentio")) {
3125 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3126 return JNI_EINVAL;
3127 }
3128 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3129 return JNI_EINVAL;
3130 }
3131 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3132 return JNI_EINVAL;
3133 }
3134 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3135 return JNI_EINVAL;
3136 }
3137 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3138 return JNI_EINVAL;
3139 }
3140
3141 // -Xinternalversion
3142 } else if (match_option(option, "-Xinternalversion")) {
3143 jio_fprintf(defaultStream::output_stream(), "%s\n",
3144 VM_Version::internal_vm_info_string());
3145 vm_exit(0);
3146 #ifndef PRODUCT
3147 // -Xprintflags
3148 } else if (match_option(option, "-Xprintflags")) {
3149 CommandLineFlags::printFlags(tty, false);
3150 vm_exit(0);
3151 #endif
3152 // -D
3153 } else if (match_option(option, "-D", &tail)) {
3154 const char* value;
3155 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3156 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3157 // abort if -Djava.endorsed.dirs is set
3158 jio_fprintf(defaultStream::output_stream(),
3159 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3160 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3161 return JNI_EINVAL;
3162 }
3163 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3164 *value != '\0' && strcmp(value, "\"\"") != 0) {
3165 // abort if -Djava.ext.dirs is set
3166 jio_fprintf(defaultStream::output_stream(),
3167 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3168 return JNI_EINVAL;
3169 }
3170 // Silently ignore module related properties. They must be set using the modules
3171 // options. For example: use "--add-modules java.sql", not "-Djdk.module.addmods=java.sql"
3172 if (is_module_property(option)) {
3173 continue;
3174 }
3175
3176 if (!add_property(tail)) {
3177 return JNI_ENOMEM;
3178 }
3179 // Out of the box management support
3180 if (match_option(option, "-Dcom.sun.management", &tail)) {
3181 #if INCLUDE_MANAGEMENT
3182 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 // management agent in module java.management
3186 if (!Arguments::append_to_addmods_property("java.management")) {
3187 return JNI_ENOMEM;
3188 }
3189 #else
3190 jio_fprintf(defaultStream::output_stream(),
3191 "-Dcom.sun.management is not supported in this VM.\n");
3192 return JNI_ERR;
3193 #endif
3194 }
3195 // -Xint
3196 } else if (match_option(option, "-Xint")) {
3197 set_mode_flags(_int);
3198 // -Xmixed
3199 } else if (match_option(option, "-Xmixed")) {
3200 set_mode_flags(_mixed);
3201 // -Xcomp
3202 } else if (match_option(option, "-Xcomp")) {
3203 // for testing the compiler; turn off all flags that inhibit compilation
3204 set_mode_flags(_comp);
3205 // -Xshare:dump
3206 } else if (match_option(option, "-Xshare:dump")) {
3207 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3208 return JNI_EINVAL;
3209 }
3210 set_mode_flags(_int); // Prevent compilation, which creates objects
3211 // -Xshare:on
3212 } else if (match_option(option, "-Xshare:on")) {
3213 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3217 return JNI_EINVAL;
3218 }
3219 // -Xshare:auto
3220 } else if (match_option(option, "-Xshare:auto")) {
3221 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3222 return JNI_EINVAL;
3223 }
3224 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3225 return JNI_EINVAL;
3226 }
3227 // -Xshare:off
3228 } else if (match_option(option, "-Xshare:off")) {
3229 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3230 return JNI_EINVAL;
3231 }
3232 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3233 return JNI_EINVAL;
3234 }
3235 // -Xverify
3236 } else if (match_option(option, "-Xverify", &tail)) {
3237 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3238 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3239 return JNI_EINVAL;
3240 }
3241 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3242 return JNI_EINVAL;
3243 }
3244 } else if (strcmp(tail, ":remote") == 0) {
3245 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3246 return JNI_EINVAL;
3247 }
3248 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3249 return JNI_EINVAL;
3250 }
3251 } else if (strcmp(tail, ":none") == 0) {
3252 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3256 return JNI_EINVAL;
3257 }
3258 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3259 return JNI_EINVAL;
3260 }
3261 // -Xdebug
3262 } else if (match_option(option, "-Xdebug")) {
3263 // note this flag has been used, then ignore
3264 set_xdebug_mode(true);
3265 // -Xnoagent
3266 } else if (match_option(option, "-Xnoagent")) {
3267 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3268 } else if (match_option(option, "-Xloggc:", &tail)) {
3269 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3270 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3271 _gc_log_filename = os::strdup_check_oom(tail);
3272 } else if (match_option(option, "-Xlog", &tail)) {
3273 bool ret = false;
3274 if (strcmp(tail, ":help") == 0) {
3275 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3276 vm_exit(0);
3277 } else if (strcmp(tail, ":disable") == 0) {
3278 LogConfiguration::disable_logging();
3279 ret = true;
3280 } else if (*tail == '\0') {
3281 ret = LogConfiguration::parse_command_line_arguments();
3282 assert(ret, "-Xlog without arguments should never fail to parse");
3283 } else if (*tail == ':') {
3284 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3285 }
3286 if (ret == false) {
3287 jio_fprintf(defaultStream::error_stream(),
3288 "Invalid -Xlog option '-Xlog%s'\n",
3289 tail);
3290 return JNI_EINVAL;
3291 }
3292 // JNI hooks
3293 } else if (match_option(option, "-Xcheck", &tail)) {
3294 if (!strcmp(tail, ":jni")) {
3295 #if !INCLUDE_JNI_CHECK
3296 warning("JNI CHECKING is not supported in this VM");
3297 #else
3298 CheckJNICalls = true;
3299 #endif // INCLUDE_JNI_CHECK
3300 } else if (is_bad_option(option, args->ignoreUnrecognized,
3301 "check")) {
3302 return JNI_EINVAL;
3303 }
3304 } else if (match_option(option, "vfprintf")) {
3305 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3306 } else if (match_option(option, "exit")) {
3307 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3308 } else if (match_option(option, "abort")) {
3309 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3310 // -XX:+AggressiveHeap
3311 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3312 jint result = set_aggressive_heap_flags();
3313 if (result != JNI_OK) {
3314 return result;
3315 }
3316 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3317 // and the last option wins.
3318 } else if (match_option(option, "-XX:+NeverTenure")) {
3319 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3326 return JNI_EINVAL;
3327 }
3328 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3329 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3330 return JNI_EINVAL;
3331 }
3332 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3336 return JNI_EINVAL;
3337 }
3338 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3339 uintx max_tenuring_thresh = 0;
3340 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3343 return JNI_EINVAL;
3344 }
3345
3346 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3347 return JNI_EINVAL;
3348 }
3349
3350 if (MaxTenuringThreshold == 0) {
3351 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3352 return JNI_EINVAL;
3353 }
3354 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3355 return JNI_EINVAL;
3356 }
3357 } else {
3358 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3359 return JNI_EINVAL;
3360 }
3361 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3362 return JNI_EINVAL;
3363 }
3364 }
3365 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3366 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3367 return JNI_EINVAL;
3368 }
3369 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3370 return JNI_EINVAL;
3371 }
3372 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3373 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3374 return JNI_EINVAL;
3375 }
3376 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3377 return JNI_EINVAL;
3378 }
3379 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3380 #if defined(DTRACE_ENABLED)
3381 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3382 return JNI_EINVAL;
3383 }
3384 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3385 return JNI_EINVAL;
3386 }
3387 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3388 return JNI_EINVAL;
3389 }
3390 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3391 return JNI_EINVAL;
3392 }
3393 #else // defined(DTRACE_ENABLED)
3394 jio_fprintf(defaultStream::error_stream(),
3395 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3396 return JNI_EINVAL;
3397 #endif // defined(DTRACE_ENABLED)
3398 #ifdef ASSERT
3399 } else if (match_option(option, "-XX:+FullGCALot")) {
3400 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3401 return JNI_EINVAL;
3402 }
3403 // disable scavenge before parallel mark-compact
3404 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 #endif
3408 #if !INCLUDE_MANAGEMENT
3409 } else if (match_option(option, "-XX:+ManagementServer")) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "ManagementServer is not supported in this VM.\n");
3412 return JNI_ERR;
3413 #endif // INCLUDE_MANAGEMENT
3414 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3415 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3416 // already been handled
3417 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3418 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3419 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3420 return JNI_EINVAL;
3421 }
3422 }
3423 // Unknown option
3424 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3425 return JNI_ERR;
3426 }
3427 }
3428
3429 // PrintSharedArchiveAndExit will turn on
3430 // -Xshare:on
3431 // -Xlog:class+path=info
3432 if (PrintSharedArchiveAndExit) {
3433 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3434 return JNI_EINVAL;
3435 }
3436 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3437 return JNI_EINVAL;
3438 }
3439 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3440 }
3441
3442 // Change the default value for flags which have different default values
3443 // when working with older JDKs.
3444 #ifdef LINUX
3445 if (JDK_Version::current().compare_major(6) <= 0 &&
3446 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3447 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3448 }
3449 #endif // LINUX
3450 fix_appclasspath();
3451 return JNI_OK;
3452 }
3453
3454 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3455 // For java.base check for duplicate --patch-module options being specified on the command line.
3456 // This check is only required for java.base, all other duplicate module specifications
3457 // will be checked during module system initialization. The module system initialization
3458 // will throw an ExceptionInInitializerError if this situation occurs.
3459 if (strcmp(module_name, "java.base") == 0) {
3460 if (*patch_mod_javabase) {
3461 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module");
3462 } else {
3463 *patch_mod_javabase = true;
3464 }
3465 }
3466
3467 // Create GrowableArray lazily, only if --patch-module has been specified
3468 if (_patch_mod_prefix == NULL) {
3469 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3470 }
3471
3472 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3473 }
3474
3475 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3476 // that follows either the jimage file or exploded module directories. The
3477 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3478 void Arguments::set_jdkbootclasspath_append() {
3479 char *sysclasspath = get_sysclasspath();
3480 assert(sysclasspath != NULL, "NULL sysclasspath");
3481 int bcp_a_idx = bootclassloader_append_index();
3482 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3483 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3484 }
3485 }
3486
3487 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3488 //
3489 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3490 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3491 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3492 // path is treated as the current directory.
3493 //
3494 // This causes problems with CDS, which requires that all directories specified in the classpath
3495 // must be empty. In most cases, applications do NOT want to load classes from the current
3496 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3497 // scripts compatible with CDS.
3498 void Arguments::fix_appclasspath() {
3499 if (IgnoreEmptyClassPaths) {
3500 const char separator = *os::path_separator();
3501 const char* src = _java_class_path->value();
3502
3503 // skip over all the leading empty paths
3504 while (*src == separator) {
3505 src ++;
3506 }
3507
3508 char* copy = os::strdup_check_oom(src, mtArguments);
3509
3510 // trim all trailing empty paths
3511 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3512 *tail = '\0';
3513 }
3514
3515 char from[3] = {separator, separator, '\0'};
3516 char to [2] = {separator, '\0'};
3517 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3518 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3519 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3520 }
3521
3522 _java_class_path->set_writeable_value(copy);
3523 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3524 }
3525 }
3526
3527 static bool has_jar_files(const char* directory) {
3528 DIR* dir = os::opendir(directory);
3529 if (dir == NULL) return false;
3530
3531 struct dirent *entry;
3532 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3533 bool hasJarFile = false;
3534 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3535 const char* name = entry->d_name;
3536 const char* ext = name + strlen(name) - 4;
3537 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3538 }
3539 FREE_C_HEAP_ARRAY(char, dbuf);
3540 os::closedir(dir);
3541 return hasJarFile ;
3542 }
3543
3544 static int check_non_empty_dirs(const char* path) {
3545 const char separator = *os::path_separator();
3546 const char* const end = path + strlen(path);
3547 int nonEmptyDirs = 0;
3548 while (path < end) {
3549 const char* tmp_end = strchr(path, separator);
3550 if (tmp_end == NULL) {
3551 if (has_jar_files(path)) {
3552 nonEmptyDirs++;
3553 jio_fprintf(defaultStream::output_stream(),
3554 "Non-empty directory: %s\n", path);
3555 }
3556 path = end;
3557 } else {
3558 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3559 memcpy(dirpath, path, tmp_end - path);
3560 dirpath[tmp_end - path] = '\0';
3561 if (has_jar_files(dirpath)) {
3562 nonEmptyDirs++;
3563 jio_fprintf(defaultStream::output_stream(),
3564 "Non-empty directory: %s\n", dirpath);
3565 }
3566 FREE_C_HEAP_ARRAY(char, dirpath);
3567 path = tmp_end + 1;
3568 }
3569 }
3570 return nonEmptyDirs;
3571 }
3572
3573 jint Arguments::finalize_vm_init_args() {
3574 // check if the default lib/endorsed directory exists; if so, error
3575 char path[JVM_MAXPATHLEN];
3576 const char* fileSep = os::file_separator();
3577 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3578
3579 if (CheckEndorsedAndExtDirs) {
3580 int nonEmptyDirs = 0;
3581 // check endorsed directory
3582 nonEmptyDirs += check_non_empty_dirs(path);
3583 // check the extension directories
3584 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3585 if (nonEmptyDirs > 0) {
3586 return JNI_ERR;
3587 }
3588 }
3589
3590 DIR* dir = os::opendir(path);
3591 if (dir != NULL) {
3592 jio_fprintf(defaultStream::output_stream(),
3593 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3594 "in modular form will be supported via the concept of upgradeable modules.\n");
3595 os::closedir(dir);
3596 return JNI_ERR;
3597 }
3598
3599 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3600 dir = os::opendir(path);
3601 if (dir != NULL) {
3602 jio_fprintf(defaultStream::output_stream(),
3603 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3604 "Use -classpath instead.\n.");
3605 os::closedir(dir);
3606 return JNI_ERR;
3607 }
3608
3609 // Append the value of the last --add-modules option specified on the command line.
3610 // This needs to be done here, to prevent overwriting possible values written
3611 // to the jdk.module.addmods property by -javaagent and other options.
3612 if (add_modules_value != NULL) {
3613 append_to_addmods_property(add_modules_value);
3614 }
3615
3616 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3617
3618 // This must be done after all arguments have been processed.
3619 // java_compiler() true means set to "NONE" or empty.
3620 if (java_compiler() && !xdebug_mode()) {
3621 // For backwards compatibility, we switch to interpreted mode if
3622 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3623 // not specified.
3624 set_mode_flags(_int);
3625 }
3626
3627 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3628 // but like -Xint, leave compilation thresholds unaffected.
3629 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3630 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3631 set_mode_flags(_int);
3632 }
3633
3634 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3635 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3636 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3637 }
3638
3639 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3640 // Don't degrade server performance for footprint
3641 if (FLAG_IS_DEFAULT(UseLargePages) &&
3642 MaxHeapSize < LargePageHeapSizeThreshold) {
3643 // No need for large granularity pages w/small heaps.
3644 // Note that large pages are enabled/disabled for both the
3645 // Java heap and the code cache.
3646 FLAG_SET_DEFAULT(UseLargePages, false);
3647 }
3648
3649 #elif defined(COMPILER2)
3650 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3651 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3652 }
3653 #endif
3654
3655 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3656 UNSUPPORTED_OPTION(ProfileInterpreter);
3657 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3658 #endif
3659
3660 #ifndef TIERED
3661 // Tiered compilation is undefined.
3662 UNSUPPORTED_OPTION(TieredCompilation);
3663 #endif
3664
3665 #if INCLUDE_JVMCI
3666 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3667 return JNI_ENOMEM;
3668 }
3669 #endif
3670
3671 // If we are running in a headless jre, force java.awt.headless property
3672 // to be true unless the property has already been set.
3673 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3674 if (os::is_headless_jre()) {
3675 const char* headless = Arguments::get_property("java.awt.headless");
3676 if (headless == NULL) {
3677 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3678 if (headless_env == NULL) {
3679 if (!add_property("java.awt.headless=true")) {
3680 return JNI_ENOMEM;
3681 }
3682 } else {
3683 char buffer[256];
3684 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3685 if (!add_property(buffer)) {
3686 return JNI_ENOMEM;
3687 }
3688 }
3689 }
3690 }
3691
3692 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3693 // CMS can only be used with ParNew
3694 FLAG_SET_ERGO(bool, UseParNewGC, true);
3695 }
3696
3697 if (!check_vm_args_consistency()) {
3698 return JNI_ERR;
3699 }
3700
3701 return JNI_OK;
3702 }
3703
3704 // Helper class for controlling the lifetime of JavaVMInitArgs
3705 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3706 // deleted on the destruction of the ScopedVMInitArgs object.
3707 class ScopedVMInitArgs : public StackObj {
3708 private:
3709 JavaVMInitArgs _args;
3710 char* _container_name;
3711 bool _is_set;
3712 char* _vm_options_file_arg;
3713
3714 public:
3715 ScopedVMInitArgs(const char *container_name) {
3716 _args.version = JNI_VERSION_1_2;
3717 _args.nOptions = 0;
3718 _args.options = NULL;
3719 _args.ignoreUnrecognized = false;
3720 _container_name = (char *)container_name;
3721 _is_set = false;
3722 _vm_options_file_arg = NULL;
3723 }
3724
3725 // Populates the JavaVMInitArgs object represented by this
3726 // ScopedVMInitArgs object with the arguments in options. The
3727 // allocated memory is deleted by the destructor. If this method
3728 // returns anything other than JNI_OK, then this object is in a
3729 // partially constructed state, and should be abandoned.
3730 jint set_args(GrowableArray<JavaVMOption>* options) {
3731 _is_set = true;
3732 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3733 JavaVMOption, options->length(), mtArguments);
3734 if (options_arr == NULL) {
3735 return JNI_ENOMEM;
3736 }
3737 _args.options = options_arr;
3738
3739 for (int i = 0; i < options->length(); i++) {
3740 options_arr[i] = options->at(i);
3741 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3742 if (options_arr[i].optionString == NULL) {
3743 // Rely on the destructor to do cleanup.
3744 _args.nOptions = i;
3745 return JNI_ENOMEM;
3746 }
3747 }
3748
3749 _args.nOptions = options->length();
3750 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3751 return JNI_OK;
3752 }
3753
3754 JavaVMInitArgs* get() { return &_args; }
3755 char* container_name() { return _container_name; }
3756 bool is_set() { return _is_set; }
3757 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3758 char* vm_options_file_arg() { return _vm_options_file_arg; }
3759
3760 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3761 if (_vm_options_file_arg != NULL) {
3762 os::free(_vm_options_file_arg);
3763 }
3764 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3765 }
3766
3767 ~ScopedVMInitArgs() {
3768 if (_vm_options_file_arg != NULL) {
3769 os::free(_vm_options_file_arg);
3770 }
3771 if (_args.options == NULL) return;
3772 for (int i = 0; i < _args.nOptions; i++) {
3773 os::free(_args.options[i].optionString);
3774 }
3775 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3776 }
3777
3778 // Insert options into this option list, to replace option at
3779 // vm_options_file_pos (-XX:VMOptionsFile)
3780 jint insert(const JavaVMInitArgs* args,
3781 const JavaVMInitArgs* args_to_insert,
3782 const int vm_options_file_pos) {
3783 assert(_args.options == NULL, "shouldn't be set yet");
3784 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3785 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3786
3787 int length = args->nOptions + args_to_insert->nOptions - 1;
3788 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3789 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3790 for (int i = 0; i < args->nOptions; i++) {
3791 if (i == vm_options_file_pos) {
3792 // insert the new options starting at the same place as the
3793 // -XX:VMOptionsFile option
3794 for (int j = 0; j < args_to_insert->nOptions; j++) {
3795 options->push(args_to_insert->options[j]);
3796 }
3797 } else {
3798 options->push(args->options[i]);
3799 }
3800 }
3801 // make into options array
3802 jint result = set_args(options);
3803 delete options;
3804 return result;
3805 }
3806 };
3807
3808 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3809 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3810 }
3811
3812 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3813 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3814 }
3815
3816 jint Arguments::parse_options_environment_variable(const char* name,
3817 ScopedVMInitArgs* vm_args) {
3818 char *buffer = ::getenv(name);
3819
3820 // Don't check this environment variable if user has special privileges
3821 // (e.g. unix su command).
3822 if (buffer == NULL || os::have_special_privileges()) {
3823 return JNI_OK;
3824 }
3825
3826 if ((buffer = os::strdup(buffer)) == NULL) {
3827 return JNI_ENOMEM;
3828 }
3829
3830 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3831
3832 os::free(buffer);
3833 return retcode;
3834 }
3835
3836 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3837 // read file into buffer
3838 int fd = ::open(file_name, O_RDONLY);
3839 if (fd < 0) {
3840 jio_fprintf(defaultStream::error_stream(),
3841 "Could not open options file '%s'\n",
3842 file_name);
3843 return JNI_ERR;
3844 }
3845
3846 struct stat stbuf;
3847 int retcode = os::stat(file_name, &stbuf);
3848 if (retcode != 0) {
3849 jio_fprintf(defaultStream::error_stream(),
3850 "Could not stat options file '%s'\n",
3851 file_name);
3852 os::close(fd);
3853 return JNI_ERR;
3854 }
3855
3856 if (stbuf.st_size == 0) {
3857 // tell caller there is no option data and that is ok
3858 os::close(fd);
3859 return JNI_OK;
3860 }
3861
3862 // '+ 1' for NULL termination even with max bytes
3863 size_t bytes_alloc = stbuf.st_size + 1;
3864
3865 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3866 if (NULL == buf) {
3867 jio_fprintf(defaultStream::error_stream(),
3868 "Could not allocate read buffer for options file parse\n");
3869 os::close(fd);
3870 return JNI_ENOMEM;
3871 }
3872
3873 memset(buf, 0, bytes_alloc);
3874
3875 // Fill buffer
3876 // Use ::read() instead of os::read because os::read()
3877 // might do a thread state transition
3878 // and it is too early for that here
3879
3880 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3881 os::close(fd);
3882 if (bytes_read < 0) {
3883 FREE_C_HEAP_ARRAY(char, buf);
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Could not read options file '%s'\n", file_name);
3886 return JNI_ERR;
3887 }
3888
3889 if (bytes_read == 0) {
3890 // tell caller there is no option data and that is ok
3891 FREE_C_HEAP_ARRAY(char, buf);
3892 return JNI_OK;
3893 }
3894
3895 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3896
3897 FREE_C_HEAP_ARRAY(char, buf);
3898 return retcode;
3899 }
3900
3901 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3902 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3903
3904 // some pointers to help with parsing
3905 char *buffer_end = buffer + buf_len;
3906 char *opt_hd = buffer;
3907 char *wrt = buffer;
3908 char *rd = buffer;
3909
3910 // parse all options
3911 while (rd < buffer_end) {
3912 // skip leading white space from the input string
3913 while (rd < buffer_end && isspace(*rd)) {
3914 rd++;
3915 }
3916
3917 if (rd >= buffer_end) {
3918 break;
3919 }
3920
3921 // Remember this is where we found the head of the token.
3922 opt_hd = wrt;
3923
3924 // Tokens are strings of non white space characters separated
3925 // by one or more white spaces.
3926 while (rd < buffer_end && !isspace(*rd)) {
3927 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3928 int quote = *rd; // matching quote to look for
3929 rd++; // don't copy open quote
3930 while (rd < buffer_end && *rd != quote) {
3931 // include everything (even spaces)
3932 // up until the close quote
3933 *wrt++ = *rd++; // copy to option string
3934 }
3935
3936 if (rd < buffer_end) {
3937 rd++; // don't copy close quote
3938 } else {
3939 // did not see closing quote
3940 jio_fprintf(defaultStream::error_stream(),
3941 "Unmatched quote in %s\n", name);
3942 delete options;
3943 return JNI_ERR;
3944 }
3945 } else {
3946 *wrt++ = *rd++; // copy to option string
3947 }
3948 }
3949
3950 // steal a white space character and set it to NULL
3951 *wrt++ = '\0';
3952 // We now have a complete token
3953
3954 JavaVMOption option;
3955 option.optionString = opt_hd;
3956 option.extraInfo = NULL;
3957
3958 options->append(option); // Fill in option
3959
3960 rd++; // Advance to next character
3961 }
3962
3963 // Fill out JavaVMInitArgs structure.
3964 jint status = vm_args->set_args(options);
3965
3966 delete options;
3967 return status;
3968 }
3969
3970 void Arguments::set_shared_spaces_flags() {
3971 if (DumpSharedSpaces) {
3972 if (Arguments::get_patch_mod_prefix() != NULL) {
3973 vm_exit_during_initialization(
3974 "Cannot use the following option when dumping the shared archive: --patch-module");
3975 }
3976
3977 if (RequireSharedSpaces) {
3978 warning("Cannot dump shared archive while using shared archive");
3979 }
3980 UseSharedSpaces = false;
3981 #ifdef _LP64
3982 if (!UseCompressedOops || !UseCompressedClassPointers) {
3983 vm_exit_during_initialization(
3984 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3985 }
3986 } else {
3987 if (!UseCompressedOops || !UseCompressedClassPointers) {
3988 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3989 }
3990 #endif
3991 }
3992 }
3993
3994 // Sharing support
3995 // Construct the path to the archive
3996 static char* get_shared_archive_path() {
3997 char *shared_archive_path;
3998 if (SharedArchiveFile == NULL) {
3999 char jvm_path[JVM_MAXPATHLEN];
4000 os::jvm_path(jvm_path, sizeof(jvm_path));
4001 char *end = strrchr(jvm_path, *os::file_separator());
4002 if (end != NULL) *end = '\0';
4003 size_t jvm_path_len = strlen(jvm_path);
4004 size_t file_sep_len = strlen(os::file_separator());
4005 const size_t len = jvm_path_len + file_sep_len + 20;
4006 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4007 if (shared_archive_path != NULL) {
4008 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4009 jvm_path, os::file_separator());
4010 }
4011 } else {
4012 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4013 }
4014 return shared_archive_path;
4015 }
4016
4017 #ifndef PRODUCT
4018 // Determine whether LogVMOutput should be implicitly turned on.
4019 static bool use_vm_log() {
4020 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4021 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4022 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4023 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4024 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4025 return true;
4026 }
4027
4028 #ifdef COMPILER1
4029 if (PrintC1Statistics) {
4030 return true;
4031 }
4032 #endif // COMPILER1
4033
4034 #ifdef COMPILER2
4035 if (PrintOptoAssembly || PrintOptoStatistics) {
4036 return true;
4037 }
4038 #endif // COMPILER2
4039
4040 return false;
4041 }
4042
4043 #endif // PRODUCT
4044
4045 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4046 for (int index = 0; index < args->nOptions; index++) {
4047 const JavaVMOption* option = args->options + index;
4048 const char* tail;
4049 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4050 return true;
4051 }
4052 }
4053 return false;
4054 }
4055
4056 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4057 const char* vm_options_file,
4058 const int vm_options_file_pos,
4059 ScopedVMInitArgs* vm_options_file_args,
4060 ScopedVMInitArgs* args_out) {
4061 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4062 if (code != JNI_OK) {
4063 return code;
4064 }
4065
4066 if (vm_options_file_args->get()->nOptions < 1) {
4067 return JNI_OK;
4068 }
4069
4070 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4071 jio_fprintf(defaultStream::error_stream(),
4072 "A VM options file may not refer to a VM options file. "
4073 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4074 "options file '%s' in options container '%s' is an error.\n",
4075 vm_options_file_args->vm_options_file_arg(),
4076 vm_options_file_args->container_name());
4077 return JNI_EINVAL;
4078 }
4079
4080 return args_out->insert(args, vm_options_file_args->get(),
4081 vm_options_file_pos);
4082 }
4083
4084 // Expand -XX:VMOptionsFile found in args_in as needed.
4085 // mod_args and args_out parameters may return values as needed.
4086 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4087 ScopedVMInitArgs* mod_args,
4088 JavaVMInitArgs** args_out) {
4089 jint code = match_special_option_and_act(args_in, mod_args);
4090 if (code != JNI_OK) {
4091 return code;
4092 }
4093
4094 if (mod_args->is_set()) {
4095 // args_in contains -XX:VMOptionsFile and mod_args contains the
4096 // original options from args_in along with the options expanded
4097 // from the VMOptionsFile. Return a short-hand to the caller.
4098 *args_out = mod_args->get();
4099 } else {
4100 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4101 }
4102 return JNI_OK;
4103 }
4104
4105 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4106 ScopedVMInitArgs* args_out) {
4107 // Remaining part of option string
4108 const char* tail;
4109 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4110
4111 for (int index = 0; index < args->nOptions; index++) {
4112 const JavaVMOption* option = args->options + index;
4113 if (ArgumentsExt::process_options(option)) {
4114 continue;
4115 }
4116 if (match_option(option, "-XX:Flags=", &tail)) {
4117 Arguments::set_jvm_flags_file(tail);
4118 continue;
4119 }
4120 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4121 if (vm_options_file_args.found_vm_options_file_arg()) {
4122 jio_fprintf(defaultStream::error_stream(),
4123 "The option '%s' is already specified in the options "
4124 "container '%s' so the specification of '%s' in the "
4125 "same options container is an error.\n",
4126 vm_options_file_args.vm_options_file_arg(),
4127 vm_options_file_args.container_name(),
4128 option->optionString);
4129 return JNI_EINVAL;
4130 }
4131 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4132 // If there's a VMOptionsFile, parse that
4133 jint code = insert_vm_options_file(args, tail, index,
4134 &vm_options_file_args, args_out);
4135 if (code != JNI_OK) {
4136 return code;
4137 }
4138 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4139 if (args_out->is_set()) {
4140 // The VMOptions file inserted some options so switch 'args'
4141 // to the new set of options, and continue processing which
4142 // preserves "last option wins" semantics.
4143 args = args_out->get();
4144 // The first option from the VMOptionsFile replaces the
4145 // current option. So we back track to process the
4146 // replacement option.
4147 index--;
4148 }
4149 continue;
4150 }
4151 if (match_option(option, "-XX:+PrintVMOptions")) {
4152 PrintVMOptions = true;
4153 continue;
4154 }
4155 if (match_option(option, "-XX:-PrintVMOptions")) {
4156 PrintVMOptions = false;
4157 continue;
4158 }
4159 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4160 IgnoreUnrecognizedVMOptions = true;
4161 continue;
4162 }
4163 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4164 IgnoreUnrecognizedVMOptions = false;
4165 continue;
4166 }
4167 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4168 CommandLineFlags::printFlags(tty, false);
4169 vm_exit(0);
4170 }
4171 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4172 #if INCLUDE_NMT
4173 // The launcher did not setup nmt environment variable properly.
4174 if (!MemTracker::check_launcher_nmt_support(tail)) {
4175 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4176 }
4177
4178 // Verify if nmt option is valid.
4179 if (MemTracker::verify_nmt_option()) {
4180 // Late initialization, still in single-threaded mode.
4181 if (MemTracker::tracking_level() >= NMT_summary) {
4182 MemTracker::init();
4183 }
4184 } else {
4185 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4186 }
4187 continue;
4188 #else
4189 jio_fprintf(defaultStream::error_stream(),
4190 "Native Memory Tracking is not supported in this VM\n");
4191 return JNI_ERR;
4192 #endif
4193 }
4194
4195 #ifndef PRODUCT
4196 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4197 CommandLineFlags::printFlags(tty, true);
4198 vm_exit(0);
4199 }
4200 #endif
4201 }
4202 return JNI_OK;
4203 }
4204
4205 static void print_options(const JavaVMInitArgs *args) {
4206 const char* tail;
4207 for (int index = 0; index < args->nOptions; index++) {
4208 const JavaVMOption *option = args->options + index;
4209 if (match_option(option, "-XX:", &tail)) {
4210 logOption(tail);
4211 }
4212 }
4213 }
4214
4215 bool Arguments::handle_deprecated_print_gc_flags() {
4216 if (PrintGC) {
4217 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4218 }
4219 if (PrintGCDetails) {
4220 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4221 }
4222
4223 if (_gc_log_filename != NULL) {
4224 // -Xloggc was used to specify a filename
4225 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4226 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4227 } else if (PrintGC || PrintGCDetails) {
4228 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4229 }
4230 return true;
4231 }
4232
4233 // Parse entry point called from JNI_CreateJavaVM
4234
4235 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4236 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4237
4238 // Initialize ranges, constraints and writeables
4239 CommandLineFlagRangeList::init();
4240 CommandLineFlagConstraintList::init();
4241 CommandLineFlagWriteableList::init();
4242
4243 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4244 const char* hotspotrc = ".hotspotrc";
4245 bool settings_file_specified = false;
4246 bool needs_hotspotrc_warning = false;
4247 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4248 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4249
4250 // Pointers to current working set of containers
4251 JavaVMInitArgs* cur_cmd_args;
4252 JavaVMInitArgs* cur_java_options_args;
4253 JavaVMInitArgs* cur_java_tool_options_args;
4254
4255 // Containers for modified/expanded options
4256 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4257 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4258 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4259
4260
4261 jint code =
4262 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4263 if (code != JNI_OK) {
4264 return code;
4265 }
4266
4267 code = parse_java_options_environment_variable(&initial_java_options_args);
4268 if (code != JNI_OK) {
4269 return code;
4270 }
4271
4272 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4273 &mod_java_tool_options_args,
4274 &cur_java_tool_options_args);
4275 if (code != JNI_OK) {
4276 return code;
4277 }
4278
4279 code = expand_vm_options_as_needed(initial_cmd_args,
4280 &mod_cmd_args,
4281 &cur_cmd_args);
4282 if (code != JNI_OK) {
4283 return code;
4284 }
4285
4286 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4287 &mod_java_options_args,
4288 &cur_java_options_args);
4289 if (code != JNI_OK) {
4290 return code;
4291 }
4292
4293 const char* flags_file = Arguments::get_jvm_flags_file();
4294 settings_file_specified = (flags_file != NULL);
4295
4296 if (IgnoreUnrecognizedVMOptions) {
4297 cur_cmd_args->ignoreUnrecognized = true;
4298 cur_java_tool_options_args->ignoreUnrecognized = true;
4299 cur_java_options_args->ignoreUnrecognized = true;
4300 }
4301
4302 // Parse specified settings file
4303 if (settings_file_specified) {
4304 if (!process_settings_file(flags_file, true,
4305 cur_cmd_args->ignoreUnrecognized)) {
4306 return JNI_EINVAL;
4307 }
4308 } else {
4309 #ifdef ASSERT
4310 // Parse default .hotspotrc settings file
4311 if (!process_settings_file(".hotspotrc", false,
4312 cur_cmd_args->ignoreUnrecognized)) {
4313 return JNI_EINVAL;
4314 }
4315 #else
4316 struct stat buf;
4317 if (os::stat(hotspotrc, &buf) == 0) {
4318 needs_hotspotrc_warning = true;
4319 }
4320 #endif
4321 }
4322
4323 if (PrintVMOptions) {
4324 print_options(cur_java_tool_options_args);
4325 print_options(cur_cmd_args);
4326 print_options(cur_java_options_args);
4327 }
4328
4329 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4330 jint result = parse_vm_init_args(cur_java_tool_options_args,
4331 cur_java_options_args,
4332 cur_cmd_args);
4333
4334 if (result != JNI_OK) {
4335 return result;
4336 }
4337
4338 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4339 SharedArchivePath = get_shared_archive_path();
4340 if (SharedArchivePath == NULL) {
4341 return JNI_ENOMEM;
4342 }
4343
4344 // Set up VerifySharedSpaces
4345 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4346 VerifySharedSpaces = true;
4347 }
4348
4349 // Delay warning until here so that we've had a chance to process
4350 // the -XX:-PrintWarnings flag
4351 if (needs_hotspotrc_warning) {
4352 warning("%s file is present but has been ignored. "
4353 "Run with -XX:Flags=%s to load the file.",
4354 hotspotrc, hotspotrc);
4355 }
4356
4357 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4358 UNSUPPORTED_OPTION(UseLargePages);
4359 #endif
4360
4361 ArgumentsExt::report_unsupported_options();
4362
4363 #ifndef PRODUCT
4364 if (TraceBytecodesAt != 0) {
4365 TraceBytecodes = true;
4366 }
4367 if (CountCompiledCalls) {
4368 if (UseCounterDecay) {
4369 warning("UseCounterDecay disabled because CountCalls is set");
4370 UseCounterDecay = false;
4371 }
4372 }
4373 #endif // PRODUCT
4374
4375 if (ScavengeRootsInCode == 0) {
4376 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4377 warning("Forcing ScavengeRootsInCode non-zero");
4378 }
4379 ScavengeRootsInCode = 1;
4380 }
4381
4382 if (!handle_deprecated_print_gc_flags()) {
4383 return JNI_EINVAL;
4384 }
4385
4386 // Set object alignment values.
4387 set_object_alignment();
4388
4389 #if !INCLUDE_CDS
4390 if (DumpSharedSpaces || RequireSharedSpaces) {
4391 jio_fprintf(defaultStream::error_stream(),
4392 "Shared spaces are not supported in this VM\n");
4393 return JNI_ERR;
4394 }
4395 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4396 warning("Shared spaces are not supported in this VM");
4397 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4398 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4399 }
4400 no_shared_spaces("CDS Disabled");
4401 #endif // INCLUDE_CDS
4402
4403 return JNI_OK;
4404 }
4405
4406 jint Arguments::apply_ergo() {
4407
4408 // Set flags based on ergonomics.
4409 set_ergonomics_flags();
4410
4411 set_shared_spaces_flags();
4412
4413 // Check the GC selections again.
4414 if (!check_gc_consistency()) {
4415 return JNI_EINVAL;
4416 }
4417
4418 if (TieredCompilation) {
4419 set_tiered_flags();
4420 } else {
4421 int max_compilation_policy_choice = 1;
4422 #ifdef COMPILER2
4423 max_compilation_policy_choice = 2;
4424 #endif
4425 // Check if the policy is valid.
4426 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4427 vm_exit_during_initialization(
4428 "Incompatible compilation policy selected", NULL);
4429 }
4430 // Scale CompileThreshold
4431 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4432 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4433 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4434 }
4435 }
4436
4437 #ifdef COMPILER2
4438 #ifndef PRODUCT
4439 if (PrintIdealGraphLevel > 0) {
4440 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4441 }
4442 #endif
4443 #endif
4444
4445 // Set heap size based on available physical memory
4446 set_heap_size();
4447
4448 ArgumentsExt::set_gc_specific_flags();
4449
4450 // Initialize Metaspace flags and alignments
4451 Metaspace::ergo_initialize();
4452
4453 // Set bytecode rewriting flags
4454 set_bytecode_flags();
4455
4456 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4457 jint code = set_aggressive_opts_flags();
4458 if (code != JNI_OK) {
4459 return code;
4460 }
4461
4462 // Turn off biased locking for locking debug mode flags,
4463 // which are subtly different from each other but neither works with
4464 // biased locking
4465 if (UseHeavyMonitors
4466 #ifdef COMPILER1
4467 || !UseFastLocking
4468 #endif // COMPILER1
4469 #if INCLUDE_JVMCI
4470 || !JVMCIUseFastLocking
4471 #endif
4472 ) {
4473 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4474 // flag set to true on command line; warn the user that they
4475 // can't enable biased locking here
4476 warning("Biased Locking is not supported with locking debug flags"
4477 "; ignoring UseBiasedLocking flag." );
4478 }
4479 UseBiasedLocking = false;
4480 }
4481
4482 #ifdef CC_INTERP
4483 // Clear flags not supported on zero.
4484 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4485 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4486 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4487 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4488 #endif // CC_INTERP
4489
4490 #ifdef COMPILER2
4491 if (!EliminateLocks) {
4492 EliminateNestedLocks = false;
4493 }
4494 if (!Inline) {
4495 IncrementalInline = false;
4496 }
4497 #ifndef PRODUCT
4498 if (!IncrementalInline) {
4499 AlwaysIncrementalInline = false;
4500 }
4501 #endif
4502 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4503 // nothing to use the profiling, turn if off
4504 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4505 }
4506 #endif
4507
4508 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4509 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4510 DebugNonSafepoints = true;
4511 }
4512
4513 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4514 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4515 }
4516
4517 if (UseOnStackReplacement && !UseLoopCounter) {
4518 warning("On-stack-replacement requires loop counters; enabling loop counters");
4519 FLAG_SET_DEFAULT(UseLoopCounter, true);
4520 }
4521
4522 #ifndef PRODUCT
4523 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4524 if (use_vm_log()) {
4525 LogVMOutput = true;
4526 }
4527 }
4528 #endif // PRODUCT
4529
4530 if (PrintCommandLineFlags) {
4531 CommandLineFlags::printSetFlags(tty);
4532 }
4533
4534 // Apply CPU specific policy for the BiasedLocking
4535 if (UseBiasedLocking) {
4536 if (!VM_Version::use_biased_locking() &&
4537 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4538 UseBiasedLocking = false;
4539 }
4540 }
4541 #ifdef COMPILER2
4542 if (!UseBiasedLocking || EmitSync != 0) {
4543 UseOptoBiasInlining = false;
4544 }
4545 #endif
4546
4547 return JNI_OK;
4548 }
4549
4550 jint Arguments::adjust_after_os() {
4551 if (UseNUMA) {
4552 if (UseParallelGC || UseParallelOldGC) {
4553 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4554 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4555 }
4556 }
4557 // UseNUMAInterleaving is set to ON for all collectors and
4558 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4559 // such as the parallel collector for Linux and Solaris will
4560 // interleave old gen and survivor spaces on top of NUMA
4561 // allocation policy for the eden space.
4562 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4563 // all platforms and ParallelGC on Windows will interleave all
4564 // of the heap spaces across NUMA nodes.
4565 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4566 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4567 }
4568 }
4569 return JNI_OK;
4570 }
4571
4572 int Arguments::PropertyList_count(SystemProperty* pl) {
4573 int count = 0;
4574 while(pl != NULL) {
4575 count++;
4576 pl = pl->next();
4577 }
4578 return count;
4579 }
4580
4581 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4582 assert(key != NULL, "just checking");
4583 SystemProperty* prop;
4584 for (prop = pl; prop != NULL; prop = prop->next()) {
4585 if (strcmp(key, prop->key()) == 0) return prop->value();
4586 }
4587 return NULL;
4588 }
4589
4590 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4591 int count = 0;
4592 const char* ret_val = NULL;
4593
4594 while(pl != NULL) {
4595 if(count >= index) {
4596 ret_val = pl->key();
4597 break;
4598 }
4599 count++;
4600 pl = pl->next();
4601 }
4602
4603 return ret_val;
4604 }
4605
4606 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4607 int count = 0;
4608 char* ret_val = NULL;
4609
4610 while(pl != NULL) {
4611 if(count >= index) {
4612 ret_val = pl->value();
4613 break;
4614 }
4615 count++;
4616 pl = pl->next();
4617 }
4618
4619 return ret_val;
4620 }
4621
4622 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4623 SystemProperty* p = *plist;
4624 if (p == NULL) {
4625 *plist = new_p;
4626 } else {
4627 while (p->next() != NULL) {
4628 p = p->next();
4629 }
4630 p->set_next(new_p);
4631 }
4632 }
4633
4634 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4635 bool writeable, bool internal) {
4636 if (plist == NULL)
4637 return;
4638
4639 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4640 PropertyList_add(plist, new_p);
4641 }
4642
4643 void Arguments::PropertyList_add(SystemProperty *element) {
4644 PropertyList_add(&_system_properties, element);
4645 }
4646
4647 // This add maintains unique property key in the list.
4648 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4649 PropertyAppendable append, PropertyWriteable writeable,
4650 PropertyInternal internal) {
4651 if (plist == NULL)
4652 return;
4653
4654 // If property key exist then update with new value.
4655 SystemProperty* prop;
4656 for (prop = *plist; prop != NULL; prop = prop->next()) {
4657 if (strcmp(k, prop->key()) == 0) {
4658 if (append == AppendProperty) {
4659 prop->append_value(v);
4660 } else {
4661 prop->set_value(v);
4662 }
4663 return;
4664 }
4665 }
4666
4667 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4668 }
4669
4670 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4671 // Returns true if all of the source pointed by src has been copied over to
4672 // the destination buffer pointed by buf. Otherwise, returns false.
4673 // Notes:
4674 // 1. If the length (buflen) of the destination buffer excluding the
4675 // NULL terminator character is not long enough for holding the expanded
4676 // pid characters, it also returns false instead of returning the partially
4677 // expanded one.
4678 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4679 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4680 char* buf, size_t buflen) {
4681 const char* p = src;
4682 char* b = buf;
4683 const char* src_end = &src[srclen];
4684 char* buf_end = &buf[buflen - 1];
4685
4686 while (p < src_end && b < buf_end) {
4687 if (*p == '%') {
4688 switch (*(++p)) {
4689 case '%': // "%%" ==> "%"
4690 *b++ = *p++;
4691 break;
4692 case 'p': { // "%p" ==> current process id
4693 // buf_end points to the character before the last character so
4694 // that we could write '\0' to the end of the buffer.
4695 size_t buf_sz = buf_end - b + 1;
4696 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4697
4698 // if jio_snprintf fails or the buffer is not long enough to hold
4699 // the expanded pid, returns false.
4700 if (ret < 0 || ret >= (int)buf_sz) {
4701 return false;
4702 } else {
4703 b += ret;
4704 assert(*b == '\0', "fail in copy_expand_pid");
4705 if (p == src_end && b == buf_end + 1) {
4706 // reach the end of the buffer.
4707 return true;
4708 }
4709 }
4710 p++;
4711 break;
4712 }
4713 default :
4714 *b++ = '%';
4715 }
4716 } else {
4717 *b++ = *p++;
4718 }
4719 }
4720 *b = '\0';
4721 return (p == src_end); // return false if not all of the source was copied
4722 }