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