1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 size_t Arguments::_conservative_max_heap_alignment = 0;
78 size_t Arguments::_min_heap_size = 0;
79 Arguments::Mode Arguments::_mode = _mixed;
80 bool Arguments::_java_compiler = false;
81 bool Arguments::_xdebug_mode = false;
82 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
83 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
84 int Arguments::_sun_java_launcher_pid = -1;
85 bool Arguments::_sun_java_launcher_is_altjvm = false;
86
87 // These parameters are reset in method parse_vm_init_args()
88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
90 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
91 bool Arguments::_ClipInlining = ClipInlining;
92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
94
95 char* Arguments::SharedArchivePath = NULL;
96
97 AgentLibraryList Arguments::_libraryList;
98 AgentLibraryList Arguments::_agentList;
99
100 abort_hook_t Arguments::_abort_hook = NULL;
101 exit_hook_t Arguments::_exit_hook = NULL;
102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
103
104
105 SystemProperty *Arguments::_sun_boot_library_path = NULL;
106 SystemProperty *Arguments::_java_library_path = NULL;
107 SystemProperty *Arguments::_java_home = NULL;
108 SystemProperty *Arguments::_java_class_path = NULL;
109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
110
111 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
112 PathString *Arguments::_system_boot_class_path = NULL;
113 bool Arguments::_has_jimage = false;
114
115 char* Arguments::_ext_dirs = NULL;
116
117 bool PathString::set_value(const char *value) {
118 if (_value != NULL) {
119 FreeHeap(_value);
120 }
121 _value = AllocateHeap(strlen(value)+1, mtArguments);
122 assert(_value != NULL, "Unable to allocate space for new path value");
123 if (_value != NULL) {
124 strcpy(_value, value);
125 } else {
126 // not able to allocate
127 return false;
128 }
129 return true;
130 }
131
132 void PathString::append_value(const char *value) {
133 char *sp;
134 size_t len = 0;
135 if (value != NULL) {
136 len = strlen(value);
137 if (_value != NULL) {
138 len += strlen(_value);
139 }
140 sp = AllocateHeap(len+2, mtArguments);
141 assert(sp != NULL, "Unable to allocate space for new append path value");
142 if (sp != NULL) {
143 if (_value != NULL) {
144 strcpy(sp, _value);
145 strcat(sp, os::path_separator());
146 strcat(sp, value);
147 FreeHeap(_value);
148 } else {
149 strcpy(sp, value);
150 }
151 _value = sp;
152 }
153 }
154 }
155
156 PathString::PathString(const char* value) {
157 if (value == NULL) {
158 _value = NULL;
159 } else {
160 _value = AllocateHeap(strlen(value)+1, mtArguments);
161 strcpy(_value, value);
162 }
163 }
164
165 PathString::~PathString() {
166 if (_value != NULL) {
167 FreeHeap(_value);
168 _value = NULL;
169 }
170 }
171
172 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
173 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
174 size_t len = strlen(module_name) + 1;
175 _module_name = AllocateHeap(len, mtInternal);
176 strncpy(_module_name, module_name, len); // copy the trailing null
177 _path = new PathString(path);
178 }
179
180 ModulePatchPath::~ModulePatchPath() {
181 if (_module_name != NULL) {
182 FreeHeap(_module_name);
183 _module_name = NULL;
184 }
185 if (_path != NULL) {
186 delete _path;
187 _path = NULL;
188 }
189 }
190
191 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
192 if (key == NULL) {
193 _key = NULL;
194 } else {
195 _key = AllocateHeap(strlen(key)+1, mtArguments);
196 strcpy(_key, key);
197 }
198 _next = NULL;
199 _internal = internal;
200 _writeable = writeable;
201 }
202
203 AgentLibrary::AgentLibrary(const char* name, const char* options,
204 bool is_absolute_path, void* os_lib,
205 bool instrument_lib) {
206 _name = AllocateHeap(strlen(name)+1, mtArguments);
207 strcpy(_name, name);
208 if (options == NULL) {
209 _options = NULL;
210 } else {
211 _options = AllocateHeap(strlen(options)+1, mtArguments);
212 strcpy(_options, options);
213 }
214 _is_absolute_path = is_absolute_path;
215 _os_lib = os_lib;
216 _next = NULL;
217 _state = agent_invalid;
218 _is_static_lib = false;
219 _is_instrument_lib = instrument_lib;
220 }
221
222 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
223 // part of the option string.
224 static bool match_option(const JavaVMOption *option, const char* name,
225 const char** tail) {
226 size_t len = strlen(name);
227 if (strncmp(option->optionString, name, len) == 0) {
228 *tail = option->optionString + len;
229 return true;
230 } else {
231 return false;
232 }
233 }
234
235 // Check if 'option' matches 'name'. No "tail" is allowed.
236 static bool match_option(const JavaVMOption *option, const char* name) {
237 const char* tail = NULL;
238 bool result = match_option(option, name, &tail);
239 if (tail != NULL && *tail == '\0') {
240 return result;
241 } else {
242 return false;
243 }
244 }
245
246 // Return true if any of the strings in null-terminated array 'names' matches.
247 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
248 // the option must match exactly.
249 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
250 bool tail_allowed) {
251 for (/* empty */; *names != NULL; ++names) {
252 if (match_option(option, *names, tail)) {
253 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
254 return true;
255 }
256 }
257 }
258 return false;
259 }
260
261 static void logOption(const char* opt) {
262 if (PrintVMOptions) {
263 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
264 }
265 }
266
267 bool needs_module_property_warning = false;
268
269 #define MODULE_PROPERTY_PREFIX "jdk.module."
270 #define MODULE_PROPERTY_PREFIX_LEN 11
271 #define ADDEXPORTS "addexports"
272 #define ADDEXPORTS_LEN 10
273 #define ADDREADS "addreads"
274 #define ADDREADS_LEN 8
275 #define ADDOPENS "addopens"
276 #define ADDOPENS_LEN 8
277 #define PATCH "patch"
278 #define PATCH_LEN 5
279 #define ADDMODS "addmods"
280 #define ADDMODS_LEN 7
281 #define LIMITMODS "limitmods"
282 #define LIMITMODS_LEN 9
283 #define PATH "path"
284 #define PATH_LEN 4
285 #define UPGRADE_PATH "upgrade.path"
286 #define UPGRADE_PATH_LEN 12
287
288 void Arguments::add_init_library(const char* name, char* options) {
289 _libraryList.add(new AgentLibrary(name, options, false, NULL));
290 }
291
292 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
293 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
294 }
295
296 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
297 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
298 }
299
300 // Late-binding agents not started via arguments
301 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
302 _agentList.add(agentLib);
303 }
304
305 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
306 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
307 }
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
320 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
321 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
322 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
323 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
324 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
325 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
326 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
327 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
328 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
329 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
339 // sun.java.launcher.pid is defined.
340 // Must do this before setting up other system properties,
341 // as some of them may depend on launcher type.
342 for (int index = 0; index < args->nOptions; index++) {
343 const JavaVMOption* option = args->options + index;
344 const char* tail;
345
346 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
347 process_java_launcher_argument(tail, option->extraInfo);
348 continue;
349 }
350 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
351 if (strcmp(tail, "true") == 0) {
352 _sun_java_launcher_is_altjvm = true;
353 }
354 continue;
355 }
356 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
357 _sun_java_launcher_pid = atoi(tail);
358 continue;
359 }
360 }
361 }
362
363 // Initialize system properties key and value.
364 void Arguments::init_system_properties() {
365
366 // Set up _system_boot_class_path which is not a property but
367 // relies heavily on argument processing and the jdk.boot.class.path.append
368 // property. It is used to store the underlying system boot class path.
369 _system_boot_class_path = new PathString(NULL);
370
371 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
372 "Java Virtual Machine Specification", false));
373 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
374 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
375 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
376 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
377
378 // Following are JVMTI agent writable properties.
379 // Properties values are set to NULL and they are
380 // os specific they are initialized in os::init_system_properties_values().
381 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
382 _java_library_path = new SystemProperty("java.library.path", NULL, true);
383 _java_home = new SystemProperty("java.home", NULL, true);
384 _java_class_path = new SystemProperty("java.class.path", "", true);
385 // jdk.boot.class.path.append is a non-writeable, internal property.
386 // It can only be set by either:
387 // - -Xbootclasspath/a:
388 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
389 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
390
391 // Add to System Property list.
392 PropertyList_add(&_system_properties, _sun_boot_library_path);
393 PropertyList_add(&_system_properties, _java_library_path);
394 PropertyList_add(&_system_properties, _java_home);
395 PropertyList_add(&_system_properties, _java_class_path);
396 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
397
398 // Set OS specific system properties values
399 os::init_system_properties_values();
400 }
401
402 // Update/Initialize System properties after JDK version number is known
403 void Arguments::init_version_specific_system_properties() {
404 enum { bufsz = 16 };
405 char buffer[bufsz];
406 const char* spec_vendor = "Oracle Corporation";
407 uint32_t spec_version = JDK_Version::current().major_version();
408
409 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
410
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.specification.version", buffer, false));
415 PropertyList_add(&_system_properties,
416 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
417 }
418
419 /*
420 * -XX argument processing:
421 *
422 * -XX arguments are defined in several places, such as:
423 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
424 * -XX arguments are parsed in parse_argument().
425 * -XX argument bounds checking is done in check_vm_args_consistency().
426 *
427 * Over time -XX arguments may change. There are mechanisms to handle common cases:
428 *
429 * ALIASED: An option that is simply another name for another option. This is often
430 * part of the process of deprecating a flag, but not all aliases need
431 * to be deprecated.
432 *
433 * Create an alias for an option by adding the old and new option names to the
434 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
435 *
436 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
437 * support may be removed in the future. Both regular and aliased options may be
438 * deprecated.
439 *
440 * Add a deprecation warning for an option (or alias) by adding an entry in the
441 * "special_jvm_flags" table and setting the "deprecated_in" field.
442 * Often an option "deprecated" in one major release will
443 * be made "obsolete" in the next. In this case the entry should also have its
444 * "obsolete_in" field set.
445 *
446 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
447 * on the command line. A warning is printed to let the user know that option might not
448 * be accepted in the future.
449 *
450 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
451 * table and setting the "obsolete_in" field.
452 *
453 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
454 * to the current JDK version. The system will flatly refuse to admit the existence of
455 * the flag. This allows a flag to die automatically over JDK releases.
456 *
457 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
458 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
459 * - Newly obsolete or expired deprecated options should have their global variable
460 * definitions removed (from globals.hpp, etc) and related implementations removed.
461 *
462 * Recommended approach for removing options:
463 *
464 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
465 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
466 *
467 * To remove internal options (e.g. diagnostic, experimental, develop options), use
468 * a 2-step model adding major release numbers to the obsolete and expire columns.
469 *
470 * To change the name of an option, use the alias table as well as a 2-step
471 * model adding major release numbers to the deprecate and expire columns.
472 * Think twice about aliasing commonly used customer options.
473 *
474 * There are times when it is appropriate to leave a future release number as undefined.
475 *
476 * Tests: Aliases should be tested in VMAliasOptions.java.
477 * Deprecated options should be tested in VMDeprecatedOptions.java.
478 */
479
480 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
481 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
482 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
483 // the command-line as usual, but will issue a warning.
484 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
485 // the command-line, while issuing a warning and ignoring the flag value.
486 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
487 // existence of the flag.
488 //
489 // MANUAL CLEANUP ON JDK VERSION UPDATES:
490 // This table ensures that the handling of options will update automatically when the JDK
491 // version is incremented, but the source code needs to be cleanup up manually:
492 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
493 // variable should be removed, as well as users of the variable.
494 // - As "deprecated" options age into "obsolete" options, move the entry into the
495 // "Obsolete Flags" section of the table.
496 // - All expired options should be removed from the table.
497 static SpecialFlag const special_jvm_flags[] = {
498 // -------------- Deprecated Flags --------------
499 // --- Non-alias flags - sorted by obsolete_in then expired_in:
500 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
502 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
503 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
504 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
505 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
506 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
507 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
508 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
509 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
510 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
511 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
512 { "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) },
513 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
515
516 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
517 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
518 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521
522 // -------------- Obsolete Flags - sorted by expired_in --------------
523 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
524 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
525 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
526 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
527 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
528 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
529 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
530 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
531 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
532 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
533
534 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
535 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
536 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
537 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
538 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
539 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
541 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
542 #endif
543
544 { NULL, JDK_Version(0), JDK_Version(0) }
545 };
546
547 // Flags that are aliases for other flags.
548 typedef struct {
549 const char* alias_name;
550 const char* real_name;
551 } AliasedFlag;
552
553 static AliasedFlag const aliased_jvm_flags[] = {
554 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
555 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
556 { NULL, NULL}
557 };
558
559 // NOTE: A compatibility request will be necessary for each alias to be removed.
560 static AliasedLoggingFlag const aliased_logging_flags[] = {
561 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
562 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
563 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
564 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
565 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
566 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
567 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
568 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
569 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
570 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
571 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
572 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
573 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
574 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
575 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
576 };
577
578 #ifndef PRODUCT
579 // These options are removed in jdk9. Remove this code for jdk10.
580 static AliasedFlag const removed_develop_logging_flags[] = {
581 { "TraceClassInitialization", "-Xlog:class+init" },
582 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
583 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
584 { "TraceItables", "-Xlog:itables=debug" },
585 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
586 { "TraceSafepoint", "-Xlog:safepoint=debug" },
587 { "TraceStartupTime", "-Xlog:startuptime" },
588 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
589 { "PrintVtables", "-Xlog:vtables=debug" },
590 { "VerboseVerification", "-Xlog:verification" },
591 { NULL, NULL }
592 };
593 #endif //PRODUCT
594
595 // Return true if "v" is less than "other", where "other" may be "undefined".
596 static bool version_less_than(JDK_Version v, JDK_Version other) {
597 assert(!v.is_undefined(), "must be defined");
598 if (!other.is_undefined() && v.compare(other) >= 0) {
599 return false;
600 } else {
601 return true;
602 }
603 }
604
605 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
606
607 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
608 // Allow extensions to have priority
609 if (lookup_special_flag_ext(flag_name, flag)) {
610 return true;
611 }
612
613 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
614 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
615 flag = special_jvm_flags[i];
616 return true;
617 }
618 }
619 return false;
620 }
621
622 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
623 assert(version != NULL, "Must provide a version buffer");
624 SpecialFlag flag;
625 if (lookup_special_flag(flag_name, flag)) {
626 if (!flag.obsolete_in.is_undefined()) {
627 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
628 *version = flag.obsolete_in;
629 return true;
630 }
631 }
632 }
633 return false;
634 }
635
636 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
637 assert(version != NULL, "Must provide a version buffer");
638 SpecialFlag flag;
639 if (lookup_special_flag(flag_name, flag)) {
640 if (!flag.deprecated_in.is_undefined()) {
641 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
642 version_less_than(JDK_Version::current(), flag.expired_in)) {
643 *version = flag.deprecated_in;
644 return 1;
645 } else {
646 return -1;
647 }
648 }
649 }
650 return 0;
651 }
652
653 #ifndef PRODUCT
654 const char* Arguments::removed_develop_logging_flag_name(const char* name){
655 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
656 const AliasedFlag& flag = removed_develop_logging_flags[i];
657 if (strcmp(flag.alias_name, name) == 0) {
658 return flag.real_name;
659 }
660 }
661 return NULL;
662 }
663 #endif // PRODUCT
664
665 const char* Arguments::real_flag_name(const char *flag_name) {
666 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
667 const AliasedFlag& flag_status = aliased_jvm_flags[i];
668 if (strcmp(flag_status.alias_name, flag_name) == 0) {
669 return flag_status.real_name;
670 }
671 }
672 return flag_name;
673 }
674
675 #ifdef ASSERT
676 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
677 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
678 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
679 return true;
680 }
681 }
682 return false;
683 }
684
685 // Verifies the correctness of the entries in the special_jvm_flags table.
686 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
687 // version being earlier than the deprecation version, then a warning is issued
688 // and verification fails - by returning false. If it is detected that the table
689 // is out of date, with respect to the current version, then a warning is issued
690 // but verification does not fail. This allows the VM to operate when the version
691 // is first updated, without needing to update all the impacted flags at the
692 // same time.
693 static bool verify_special_jvm_flags() {
694 bool success = true;
695 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
696 const SpecialFlag& flag = special_jvm_flags[i];
697 if (lookup_special_flag(flag.name, i)) {
698 warning("Duplicate special flag declaration \"%s\"", flag.name);
699 success = false;
700 }
701 if (flag.deprecated_in.is_undefined() &&
702 flag.obsolete_in.is_undefined()) {
703 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
704 success = false;
705 }
706
707 if (!flag.deprecated_in.is_undefined()) {
708 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
709 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
710 success = false;
711 }
712
713 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
714 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
715 success = false;
716 }
717 }
718
719 if (!flag.obsolete_in.is_undefined()) {
720 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
721 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
722 success = false;
723 }
724
725 // if flag has become obsolete it should not have a "globals" flag defined anymore.
726 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
727 if (Flag::find_flag(flag.name) != NULL) {
728 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
729 }
730 }
731 }
732
733 if (!flag.expired_in.is_undefined()) {
734 // if flag has become expired it should not have a "globals" flag defined anymore.
735 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
736 if (Flag::find_flag(flag.name) != NULL) {
737 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
738 }
739 }
740 }
741
742 }
743 return success;
744 }
745 #endif
746
747 // Parses a size specification string.
748 bool Arguments::atojulong(const char *s, julong* result) {
749 julong n = 0;
750
751 // First char must be a digit. Don't allow negative numbers or leading spaces.
752 if (!isdigit(*s)) {
753 return false;
754 }
755
756 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
757 char* remainder;
758 errno = 0;
759 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
760 if (errno != 0) {
761 return false;
762 }
763
764 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
765 if (remainder == s || strlen(remainder) > 1) {
766 return false;
767 }
768
769 switch (*remainder) {
770 case 'T': case 't':
771 *result = n * G * K;
772 // Check for overflow.
773 if (*result/((julong)G * K) != n) return false;
774 return true;
775 case 'G': case 'g':
776 *result = n * G;
777 if (*result/G != n) return false;
778 return true;
779 case 'M': case 'm':
780 *result = n * M;
781 if (*result/M != n) return false;
782 return true;
783 case 'K': case 'k':
784 *result = n * K;
785 if (*result/K != n) return false;
786 return true;
787 case '\0':
788 *result = n;
789 return true;
790 default:
791 return false;
792 }
793 }
794
795 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
796 if (size < min_size) return arg_too_small;
797 if (size > max_size) return arg_too_big;
798 return arg_in_range;
799 }
800
801 // Describe an argument out of range error
802 void Arguments::describe_range_error(ArgsRange errcode) {
803 switch(errcode) {
804 case arg_too_big:
805 jio_fprintf(defaultStream::error_stream(),
806 "The specified size exceeds the maximum "
807 "representable size.\n");
808 break;
809 case arg_too_small:
810 case arg_unreadable:
811 case arg_in_range:
812 // do nothing for now
813 break;
814 default:
815 ShouldNotReachHere();
816 }
817 }
818
819 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
820 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
821 return true;
822 } else {
823 return false;
824 }
825 }
826
827 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
828 char* end;
829 errno = 0;
830 double v = strtod(value, &end);
831 if ((errno != 0) || (*end != 0)) {
832 return false;
833 }
834
835 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
836 return true;
837 }
838 return false;
839 }
840
841 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
842 julong v;
843 int int_v;
844 intx intx_v;
845 bool is_neg = false;
846 Flag* result = Flag::find_flag(name, strlen(name));
847
848 if (result == NULL) {
849 return false;
850 }
851
852 // Check the sign first since atojulong() parses only unsigned values.
853 if (*value == '-') {
854 if (!result->is_intx() && !result->is_int()) {
855 return false;
856 }
857 value++;
858 is_neg = true;
859 }
860 if (!Arguments::atojulong(value, &v)) {
861 return false;
862 }
863 if (result->is_int()) {
864 int_v = (int) v;
865 if (is_neg) {
866 int_v = -int_v;
867 }
868 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
869 } else if (result->is_uint()) {
870 uint uint_v = (uint) v;
871 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
872 } else if (result->is_intx()) {
873 intx_v = (intx) v;
874 if (is_neg) {
875 intx_v = -intx_v;
876 }
877 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
878 } else if (result->is_uintx()) {
879 uintx uintx_v = (uintx) v;
880 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
881 } else if (result->is_uint64_t()) {
882 uint64_t uint64_t_v = (uint64_t) v;
883 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
884 } else if (result->is_size_t()) {
885 size_t size_t_v = (size_t) v;
886 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
887 } else if (result->is_double()) {
888 double double_v = (double) v;
889 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
890 } else {
891 return false;
892 }
893 }
894
895 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
896 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
897 // Contract: CommandLineFlags always returns a pointer that needs freeing.
898 FREE_C_HEAP_ARRAY(char, value);
899 return true;
900 }
901
902 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
903 const char* old_value = "";
904 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
905 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
906 size_t new_len = strlen(new_value);
907 const char* value;
908 char* free_this_too = NULL;
909 if (old_len == 0) {
910 value = new_value;
911 } else if (new_len == 0) {
912 value = old_value;
913 } else {
914 size_t length = old_len + 1 + new_len + 1;
915 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
916 // each new setting adds another LINE to the switch:
917 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
918 value = buf;
919 free_this_too = buf;
920 }
921 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
922 // CommandLineFlags always returns a pointer that needs freeing.
923 FREE_C_HEAP_ARRAY(char, value);
924 if (free_this_too != NULL) {
925 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
926 FREE_C_HEAP_ARRAY(char, free_this_too);
927 }
928 return true;
929 }
930
931 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
932 const char* real_name = real_flag_name(arg);
933 JDK_Version since = JDK_Version();
934 switch (is_deprecated_flag(arg, &since)) {
935 case -1:
936 return NULL; // obsolete or expired, don't process normally
937 case 0:
938 return real_name;
939 case 1: {
940 if (warn) {
941 char version[256];
942 since.to_string(version, sizeof(version));
943 if (real_name != arg) {
944 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
945 arg, version, real_name);
946 } else {
947 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
948 arg, version);
949 }
950 }
951 return real_name;
952 }
953 }
954 ShouldNotReachHere();
955 return NULL;
956 }
957
958 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
959 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
960 // Set tagset string buffer at max size of 256, large enough for any alias tagset
961 const int max_tagset_size = 256;
962 int max_tagset_len = max_tagset_size - 1;
963 char tagset_buffer[max_tagset_size];
964 tagset_buffer[0] = '\0';
965
966 // Write tag-set for aliased logging option, in string list form
967 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
968 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
969 if (i > 0) {
970 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
971 }
972 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
973 }
974 if (!alf.exactMatch) {
975 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
976 }
977 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
978 (on) ? "+" : "-",
979 name,
980 tagset_buffer,
981 (on) ? LogLevel::name(alf.level) : "off");
982 }
983
984 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
985 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
986 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
987 if (strcmp(alf.alias_name, name) == 0) {
988 log_deprecated_flag(name, on, alf);
989 return alf;
990 }
991 }
992 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
993 return a;
994 }
995
996 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
997
998 // range of acceptable characters spelled out for portability reasons
999 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1000 #define BUFLEN 255
1001 char name[BUFLEN+1];
1002 char dummy;
1003 const char* real_name;
1004 bool warn_if_deprecated = true;
1005
1006 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1007 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1008 if (alf.alias_name != NULL){
1009 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1010 return true;
1011 }
1012 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1013 if (real_name == NULL) {
1014 return false;
1015 }
1016 return set_bool_flag(real_name, false, origin);
1017 }
1018 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1019 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1020 if (alf.alias_name != NULL){
1021 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1022 return true;
1023 }
1024 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1025 if (real_name == NULL) {
1026 return false;
1027 }
1028 return set_bool_flag(real_name, true, origin);
1029 }
1030
1031 char punct;
1032 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1033 const char* value = strchr(arg, '=') + 1;
1034 Flag* flag;
1035
1036 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1037 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1038 if (alf.alias_name != NULL) {
1039 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1040 return true;
1041 }
1042 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1043 if (real_name == NULL) {
1044 return false;
1045 }
1046 flag = Flag::find_flag(real_name);
1047 if (flag != NULL && flag->is_ccstr()) {
1048 if (flag->ccstr_accumulates()) {
1049 return append_to_string_flag(real_name, value, origin);
1050 } else {
1051 if (value[0] == '\0') {
1052 value = NULL;
1053 }
1054 return set_string_flag(real_name, value, origin);
1055 }
1056 } else {
1057 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1058 }
1059 }
1060
1061 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1062 const char* value = strchr(arg, '=') + 1;
1063 // -XX:Foo:=xxx will reset the string flag to the given value.
1064 if (value[0] == '\0') {
1065 value = NULL;
1066 }
1067 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1068 if (real_name == NULL) {
1069 return false;
1070 }
1071 return set_string_flag(real_name, value, origin);
1072 }
1073
1074 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1075 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1076 #define NUMBER_RANGE "[0123456789eE+-]"
1077 char value[BUFLEN + 1];
1078 char value2[BUFLEN + 1];
1079 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1080 // Looks like a floating-point number -- try again with more lenient format string
1081 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1083 if (real_name == NULL) {
1084 return false;
1085 }
1086 return set_fp_numeric_flag(real_name, value, origin);
1087 }
1088 }
1089
1090 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1091 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1092 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1093 if (real_name == NULL) {
1094 return false;
1095 }
1096 return set_numeric_flag(real_name, value, origin);
1097 }
1098
1099 return false;
1100 }
1101
1102 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1103 assert(bldarray != NULL, "illegal argument");
1104
1105 if (arg == NULL) {
1106 return;
1107 }
1108
1109 int new_count = *count + 1;
1110
1111 // expand the array and add arg to the last element
1112 if (*bldarray == NULL) {
1113 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1114 } else {
1115 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1116 }
1117 (*bldarray)[*count] = os::strdup_check_oom(arg);
1118 *count = new_count;
1119 }
1120
1121 void Arguments::build_jvm_args(const char* arg) {
1122 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1123 }
1124
1125 void Arguments::build_jvm_flags(const char* arg) {
1126 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1127 }
1128
1129 // utility function to return a string that concatenates all
1130 // strings in a given char** array
1131 const char* Arguments::build_resource_string(char** args, int count) {
1132 if (args == NULL || count == 0) {
1133 return NULL;
1134 }
1135 size_t length = 0;
1136 for (int i = 0; i < count; i++) {
1137 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1138 }
1139 char* s = NEW_RESOURCE_ARRAY(char, length);
1140 char* dst = s;
1141 for (int j = 0; j < count; j++) {
1142 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1143 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1144 dst += offset;
1145 length -= offset;
1146 }
1147 return (const char*) s;
1148 }
1149
1150 void Arguments::print_on(outputStream* st) {
1151 st->print_cr("VM Arguments:");
1152 if (num_jvm_flags() > 0) {
1153 st->print("jvm_flags: "); print_jvm_flags_on(st);
1154 st->cr();
1155 }
1156 if (num_jvm_args() > 0) {
1157 st->print("jvm_args: "); print_jvm_args_on(st);
1158 st->cr();
1159 }
1160 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1161 if (_java_class_path != NULL) {
1162 char* path = _java_class_path->value();
1163 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1164 }
1165 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1166 }
1167
1168 void Arguments::print_summary_on(outputStream* st) {
1169 // Print the command line. Environment variables that are helpful for
1170 // reproducing the problem are written later in the hs_err file.
1171 // flags are from setting file
1172 if (num_jvm_flags() > 0) {
1173 st->print_raw("Settings File: ");
1174 print_jvm_flags_on(st);
1175 st->cr();
1176 }
1177 // args are the command line and environment variable arguments.
1178 st->print_raw("Command Line: ");
1179 if (num_jvm_args() > 0) {
1180 print_jvm_args_on(st);
1181 }
1182 // this is the classfile and any arguments to the java program
1183 if (java_command() != NULL) {
1184 st->print("%s", java_command());
1185 }
1186 st->cr();
1187 }
1188
1189 void Arguments::print_jvm_flags_on(outputStream* st) {
1190 if (_num_jvm_flags > 0) {
1191 for (int i=0; i < _num_jvm_flags; i++) {
1192 st->print("%s ", _jvm_flags_array[i]);
1193 }
1194 }
1195 }
1196
1197 void Arguments::print_jvm_args_on(outputStream* st) {
1198 if (_num_jvm_args > 0) {
1199 for (int i=0; i < _num_jvm_args; i++) {
1200 st->print("%s ", _jvm_args_array[i]);
1201 }
1202 }
1203 }
1204
1205 bool Arguments::process_argument(const char* arg,
1206 jboolean ignore_unrecognized,
1207 Flag::Flags origin) {
1208 JDK_Version since = JDK_Version();
1209
1210 if (parse_argument(arg, origin)) {
1211 return true;
1212 }
1213
1214 // Determine if the flag has '+', '-', or '=' characters.
1215 bool has_plus_minus = (*arg == '+' || *arg == '-');
1216 const char* const argname = has_plus_minus ? arg + 1 : arg;
1217
1218 size_t arg_len;
1219 const char* equal_sign = strchr(argname, '=');
1220 if (equal_sign == NULL) {
1221 arg_len = strlen(argname);
1222 } else {
1223 arg_len = equal_sign - argname;
1224 }
1225
1226 // Only make the obsolete check for valid arguments.
1227 if (arg_len <= BUFLEN) {
1228 // Construct a string which consists only of the argument name without '+', '-', or '='.
1229 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1230 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1231 if (is_obsolete_flag(stripped_argname, &since)) {
1232 char version[256];
1233 since.to_string(version, sizeof(version));
1234 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1235 return true;
1236 }
1237 #ifndef PRODUCT
1238 else {
1239 const char* replacement;
1240 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1241 log_warning(arguments)("%s has been removed. Please use %s instead.",
1242 stripped_argname,
1243 replacement);
1244 return false;
1245 }
1246 }
1247 #endif //PRODUCT
1248 }
1249
1250 // For locked flags, report a custom error message if available.
1251 // Otherwise, report the standard unrecognized VM option.
1252 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1253 if (found_flag != NULL) {
1254 char locked_message_buf[BUFLEN];
1255 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1256 if (strlen(locked_message_buf) == 0) {
1257 if (found_flag->is_bool() && !has_plus_minus) {
1258 jio_fprintf(defaultStream::error_stream(),
1259 "Missing +/- setting for VM option '%s'\n", argname);
1260 } else if (!found_flag->is_bool() && has_plus_minus) {
1261 jio_fprintf(defaultStream::error_stream(),
1262 "Unexpected +/- setting in VM option '%s'\n", argname);
1263 } else {
1264 jio_fprintf(defaultStream::error_stream(),
1265 "Improperly specified VM option '%s'\n", argname);
1266 }
1267 } else {
1268 #ifdef PRODUCT
1269 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1270 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1271 if (ignore_unrecognized && mismatched) {
1272 return true;
1273 }
1274 #endif
1275 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1276 }
1277 } else {
1278 if (ignore_unrecognized) {
1279 return true;
1280 }
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Unrecognized VM option '%s'\n", argname);
1283 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1284 if (fuzzy_matched != NULL) {
1285 jio_fprintf(defaultStream::error_stream(),
1286 "Did you mean '%s%s%s'? ",
1287 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1288 fuzzy_matched->_name,
1289 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1290 }
1291 }
1292
1293 // allow for commandline "commenting out" options like -XX:#+Verbose
1294 return arg[0] == '#';
1295 }
1296
1297 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1298 FILE* stream = fopen(file_name, "rb");
1299 if (stream == NULL) {
1300 if (should_exist) {
1301 jio_fprintf(defaultStream::error_stream(),
1302 "Could not open settings file %s\n", file_name);
1303 return false;
1304 } else {
1305 return true;
1306 }
1307 }
1308
1309 char token[1024];
1310 int pos = 0;
1311
1312 bool in_white_space = true;
1313 bool in_comment = false;
1314 bool in_quote = false;
1315 char quote_c = 0;
1316 bool result = true;
1317
1318 int c = getc(stream);
1319 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1320 if (in_white_space) {
1321 if (in_comment) {
1322 if (c == '\n') in_comment = false;
1323 } else {
1324 if (c == '#') in_comment = true;
1325 else if (!isspace(c)) {
1326 in_white_space = false;
1327 token[pos++] = c;
1328 }
1329 }
1330 } else {
1331 if (c == '\n' || (!in_quote && isspace(c))) {
1332 // token ends at newline, or at unquoted whitespace
1333 // this allows a way to include spaces in string-valued options
1334 token[pos] = '\0';
1335 logOption(token);
1336 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1337 build_jvm_flags(token);
1338 pos = 0;
1339 in_white_space = true;
1340 in_quote = false;
1341 } else if (!in_quote && (c == '\'' || c == '"')) {
1342 in_quote = true;
1343 quote_c = c;
1344 } else if (in_quote && (c == quote_c)) {
1345 in_quote = false;
1346 } else {
1347 token[pos++] = c;
1348 }
1349 }
1350 c = getc(stream);
1351 }
1352 if (pos > 0) {
1353 token[pos] = '\0';
1354 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1355 build_jvm_flags(token);
1356 }
1357 fclose(stream);
1358 return result;
1359 }
1360
1361 //=============================================================================================================
1362 // Parsing of properties (-D)
1363
1364 const char* Arguments::get_property(const char* key) {
1365 return PropertyList_get_value(system_properties(), key);
1366 }
1367
1368 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1369 const char* eq = strchr(prop, '=');
1370 const char* key;
1371 const char* value = "";
1372
1373 if (eq == NULL) {
1374 // property doesn't have a value, thus use passed string
1375 key = prop;
1376 } else {
1377 // property have a value, thus extract it and save to the
1378 // allocated string
1379 size_t key_len = eq - prop;
1380 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1381
1382 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1383 key = tmp_key;
1384
1385 value = &prop[key_len + 1];
1386 }
1387
1388 if (strcmp(key, "java.compiler") == 0) {
1389 process_java_compiler_argument(value);
1390 // Record value in Arguments, but let it get passed to Java.
1391 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1392 strcmp(key, "sun.java.launcher.pid") == 0) {
1393 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1394 // private and are processed in process_sun_java_launcher_properties();
1395 // the sun.java.launcher property is passed on to the java application
1396 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1397 // append is true, writable is true, internal is false
1398 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1399 WriteableProperty, ExternalProperty);
1400 } else {
1401 if (strcmp(key, "sun.java.command") == 0) {
1402 char *old_java_command = _java_command;
1403 _java_command = os::strdup_check_oom(value, mtArguments);
1404 if (old_java_command != NULL) {
1405 os::free(old_java_command);
1406 }
1407 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1408 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1409 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1410 // its value without going through the property list or making a Java call.
1411 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1412 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1413 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1414 os::free((void *)old_java_vendor_url_bug);
1415 }
1416 }
1417
1418 // Create new property and add at the end of the list
1419 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1420 }
1421
1422 if (key != prop) {
1423 // SystemProperty copy passed value, thus free previously allocated
1424 // memory
1425 FreeHeap((void *)key);
1426 }
1427
1428 return true;
1429 }
1430
1431 #if INCLUDE_CDS
1432 void Arguments::check_unsupported_dumping_properties() {
1433 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1434 const char* unsupported_properties[] = { "jdk.module.main",
1435 "jdk.module.limitmods",
1436 "jdk.module.path",
1437 "jdk.module.upgrade.path",
1438 "jdk.module.patch.0" };
1439 const char* unsupported_options[] = { "-m", // cannot use at dump time
1440 "--limit-modules", // ignored at dump time
1441 "--module-path", // ignored at dump time
1442 "--upgrade-module-path", // ignored at dump time
1443 "--patch-module" // ignored at dump time
1444 };
1445 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1446 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1447 // vm will exit with an error message. Otherwise, it will print an informational message if
1448 // -Xlog:cds is enabled.
1449 uint info_idx = 1;
1450 SystemProperty* sp = system_properties();
1451 while (sp != NULL) {
1452 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1453 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1454 if (i < info_idx) {
1455 vm_exit_during_initialization(
1456 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1457 } else {
1458 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1459 unsupported_options[i]);
1460 }
1461 }
1462 }
1463 sp = sp->next();
1464 }
1465
1466 // Check for an exploded module build in use with -Xshare:dump.
1467 if (!has_jimage()) {
1468 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1469 }
1470 }
1471 #endif
1472
1473 //===========================================================================================================
1474 // Setting int/mixed/comp mode flags
1475
1476 void Arguments::set_mode_flags(Mode mode) {
1477 // Set up default values for all flags.
1478 // If you add a flag to any of the branches below,
1479 // add a default value for it here.
1480 set_java_compiler(false);
1481 _mode = mode;
1482
1483 // Ensure Agent_OnLoad has the correct initial values.
1484 // This may not be the final mode; mode may change later in onload phase.
1485 PropertyList_unique_add(&_system_properties, "java.vm.info",
1486 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1487
1488 UseInterpreter = true;
1489 UseCompiler = true;
1490 UseLoopCounter = true;
1491
1492 // Default values may be platform/compiler dependent -
1493 // use the saved values
1494 ClipInlining = Arguments::_ClipInlining;
1495 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1496 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1497 BackgroundCompilation = Arguments::_BackgroundCompilation;
1498 if (TieredCompilation) {
1499 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1500 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1501 }
1502 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1503 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1504 }
1505 }
1506
1507 // Change from defaults based on mode
1508 switch (mode) {
1509 default:
1510 ShouldNotReachHere();
1511 break;
1512 case _int:
1513 UseCompiler = false;
1514 UseLoopCounter = false;
1515 AlwaysCompileLoopMethods = false;
1516 UseOnStackReplacement = false;
1517 break;
1518 case _mixed:
1519 // same as default
1520 break;
1521 case _comp:
1522 UseInterpreter = false;
1523 BackgroundCompilation = false;
1524 ClipInlining = false;
1525 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1526 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1527 // compile a level 4 (C2) and then continue executing it.
1528 if (TieredCompilation) {
1529 Tier3InvokeNotifyFreqLog = 0;
1530 Tier4InvocationThreshold = 0;
1531 }
1532 break;
1533 }
1534 }
1535
1536 // Conflict: required to use shared spaces (-Xshare:on), but
1537 // incompatible command line options were chosen.
1538 static void no_shared_spaces(const char* message) {
1539 if (RequireSharedSpaces) {
1540 jio_fprintf(defaultStream::error_stream(),
1541 "Class data sharing is inconsistent with other specified options.\n");
1542 vm_exit_during_initialization("Unable to use shared archive.", message);
1543 } else {
1544 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1545 }
1546 }
1547
1548 // Returns threshold scaled with the value of scale.
1549 // If scale < 0.0, threshold is returned without scaling.
1550 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1551 if (scale == 1.0 || scale < 0.0) {
1552 return threshold;
1553 } else {
1554 return (intx)(threshold * scale);
1555 }
1556 }
1557
1558 // Returns freq_log scaled with the value of scale.
1559 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1560 // If scale < 0.0, freq_log is returned without scaling.
1561 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1562 // Check if scaling is necessary or if negative value was specified.
1563 if (scale == 1.0 || scale < 0.0) {
1564 return freq_log;
1565 }
1566 // Check values to avoid calculating log2 of 0.
1567 if (scale == 0.0 || freq_log == 0) {
1568 return 0;
1569 }
1570 // Determine the maximum notification frequency value currently supported.
1571 // The largest mask value that the interpreter/C1 can handle is
1572 // of length InvocationCounter::number_of_count_bits. Mask values are always
1573 // one bit shorter then the value of the notification frequency. Set
1574 // max_freq_bits accordingly.
1575 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1576 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1577 if (scaled_freq == 0) {
1578 // Return 0 right away to avoid calculating log2 of 0.
1579 return 0;
1580 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1581 return max_freq_bits;
1582 } else {
1583 return log2_intptr(scaled_freq);
1584 }
1585 }
1586
1587 void Arguments::set_tiered_flags() {
1588 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1589 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1590 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1591 }
1592 if (CompilationPolicyChoice < 2) {
1593 vm_exit_during_initialization(
1594 "Incompatible compilation policy selected", NULL);
1595 }
1596 // Increase the code cache size - tiered compiles a lot more.
1597 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1598 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1599 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1600 }
1601 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1602 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1603 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1604 }
1605 if (!UseInterpreter) { // -Xcomp
1606 Tier3InvokeNotifyFreqLog = 0;
1607 Tier4InvocationThreshold = 0;
1608 }
1609
1610 if (CompileThresholdScaling < 0) {
1611 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1612 }
1613
1614 // Scale tiered compilation thresholds.
1615 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1616 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1617 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1618 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1619
1620 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1621 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1622 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1623 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1624
1625 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1626 // once these thresholds become supported.
1627
1628 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1629 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1630
1631 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1632 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1633
1634 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1635
1636 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1637 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1638 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1639 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1640 }
1641 }
1642
1643 void set_object_alignment() {
1644 // Object alignment.
1645 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1646 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1647 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1648 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1649 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1650 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1651
1652 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1653 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1654
1655 // Oop encoding heap max
1656 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1657
1658 if (SurvivorAlignmentInBytes == 0) {
1659 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1660 }
1661 }
1662
1663 size_t Arguments::max_heap_for_compressed_oops() {
1664 // Avoid sign flip.
1665 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1666 // We need to fit both the NULL page and the heap into the memory budget, while
1667 // keeping alignment constraints of the heap. To guarantee the latter, as the
1668 // NULL page is located before the heap, we pad the NULL page to the conservative
1669 // maximum alignment that the GC may ever impose upon the heap.
1670 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1671 _conservative_max_heap_alignment);
1672
1673 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1674 NOT_LP64(ShouldNotReachHere(); return 0);
1675 }
1676
1677 void Arguments::set_use_compressed_oops() {
1678 #ifndef ZERO
1679 #ifdef _LP64
1680 // MaxHeapSize is not set up properly at this point, but
1681 // the only value that can override MaxHeapSize if we are
1682 // to use UseCompressedOops is InitialHeapSize.
1683 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1684
1685 if (max_heap_size <= max_heap_for_compressed_oops()) {
1686 #if !defined(COMPILER1) || defined(TIERED)
1687 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1688 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1689 }
1690 #endif
1691 } else {
1692 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1693 warning("Max heap size too large for Compressed Oops");
1694 FLAG_SET_DEFAULT(UseCompressedOops, false);
1695 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1696 }
1697 }
1698 #endif // _LP64
1699 #endif // ZERO
1700 }
1701
1702
1703 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1704 // set_use_compressed_oops().
1705 void Arguments::set_use_compressed_klass_ptrs() {
1706 #ifndef ZERO
1707 #ifdef _LP64
1708 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1709 if (!UseCompressedOops) {
1710 if (UseCompressedClassPointers) {
1711 warning("UseCompressedClassPointers requires UseCompressedOops");
1712 }
1713 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1714 } else {
1715 // Turn on UseCompressedClassPointers too
1716 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1717 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1718 }
1719 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1720 if (UseCompressedClassPointers) {
1721 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1722 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1723 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1724 }
1725 }
1726 }
1727 #endif // _LP64
1728 #endif // !ZERO
1729 }
1730
1731 void Arguments::set_conservative_max_heap_alignment() {
1732 // The conservative maximum required alignment for the heap is the maximum of
1733 // the alignments imposed by several sources: any requirements from the heap
1734 // itself, the collector policy and the maximum page size we may run the VM
1735 // with.
1736 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1737 _conservative_max_heap_alignment = MAX4(heap_alignment,
1738 (size_t)os::vm_allocation_granularity(),
1739 os::max_page_size(),
1740 CollectorPolicy::compute_heap_alignment());
1741 }
1742
1743 #ifdef TIERED
1744 bool Arguments::compilation_mode_selected() {
1745 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1746 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1747
1748 }
1749
1750 void Arguments::select_compilation_mode_ergonomically() {
1751 #if defined(_WINDOWS) && !defined(_LP64)
1752 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1753 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1754 }
1755 #endif
1756 if (NeverActAsServerClassMachine) {
1757 set_client_compilation_mode();
1758 }
1759 }
1760 #endif //TIERED
1761
1762 #if INCLUDE_JVMCI
1763 void Arguments::set_jvmci_specific_flags() {
1764 if (UseJVMCICompiler) {
1765 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1766 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1767 }
1768 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1769 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1770 }
1771 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1772 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1773 }
1774 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1775 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1776 }
1777 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1778 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1779 }
1780 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1781 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1782 }
1783 if (TieredStopAtLevel != CompLevel_full_optimization) {
1784 // Currently JVMCI compiler can only work at the full optimization level
1785 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1786 TieredStopAtLevel = CompLevel_full_optimization;
1787 }
1788 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1789 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1790 }
1791 }
1792 }
1793 #endif
1794
1795 jint Arguments::set_ergonomics_flags() {
1796 #ifdef TIERED
1797 if (!compilation_mode_selected()) {
1798 select_compilation_mode_ergonomically();
1799 }
1800 #endif
1801
1802 jint gc_result = GCArguments::initialize();
1803 if (gc_result != JNI_OK) {
1804 return gc_result;
1805 }
1806
1807 #if COMPILER2_OR_JVMCI
1808 // Shared spaces work fine with other GCs but causes bytecode rewriting
1809 // to be disabled, which hurts interpreter performance and decreases
1810 // server performance. When -server is specified, keep the default off
1811 // unless it is asked for. Future work: either add bytecode rewriting
1812 // at link time, or rewrite bytecodes in non-shared methods.
1813 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1814 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1815 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1816 }
1817 #endif
1818
1819 set_conservative_max_heap_alignment();
1820
1821 #ifndef ZERO
1822 #ifdef _LP64
1823 set_use_compressed_oops();
1824
1825 // set_use_compressed_klass_ptrs() must be called after calling
1826 // set_use_compressed_oops().
1827 set_use_compressed_klass_ptrs();
1828
1829 // Also checks that certain machines are slower with compressed oops
1830 // in vm_version initialization code.
1831 #endif // _LP64
1832 #endif // !ZERO
1833
1834 return JNI_OK;
1835 }
1836
1837 void Arguments::set_gc_specific_flags() {
1838 // Set GC flags
1839 GCArguments::arguments()->initialize_flags();
1840 }
1841
1842 julong Arguments::limit_by_allocatable_memory(julong limit) {
1843 julong max_allocatable;
1844 julong result = limit;
1845 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1846 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1847 }
1848 return result;
1849 }
1850
1851 // Use static initialization to get the default before parsing
1852 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1853
1854 void Arguments::set_heap_size() {
1855 julong phys_mem =
1856 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1857 : (julong)MaxRAM;
1858
1859 // Experimental support for CGroup memory limits
1860 if (UseCGroupMemoryLimitForHeap) {
1861 // This is a rough indicator that a CGroup limit may be in force
1862 // for this process
1863 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1864 FILE *fp = fopen(lim_file, "r");
1865 if (fp != NULL) {
1866 julong cgroup_max = 0;
1867 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1868 if (ret == 1 && cgroup_max > 0) {
1869 // If unlimited, cgroup_max will be a very large, but unspecified
1870 // value, so use initial phys_mem as a limit
1871 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1872 JULONG_FORMAT "MB) and initial phys_mem ("
1873 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1874 phys_mem = MIN2(cgroup_max, phys_mem);
1875 } else {
1876 warning("Unable to read/parse cgroup memory limit from %s: %s",
1877 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1878 }
1879 fclose(fp);
1880 } else {
1881 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1882 }
1883 }
1884
1885 // Convert deprecated flags
1886 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1887 !FLAG_IS_DEFAULT(MaxRAMFraction))
1888 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1889
1890 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1891 !FLAG_IS_DEFAULT(MinRAMFraction))
1892 MinRAMPercentage = 100.0 / MinRAMFraction;
1893
1894 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1895 !FLAG_IS_DEFAULT(InitialRAMFraction))
1896 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1897
1898 // If the maximum heap size has not been set with -Xmx,
1899 // then set it as fraction of the size of physical memory,
1900 // respecting the maximum and minimum sizes of the heap.
1901 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1902 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1903 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1904 if (reasonable_min < MaxHeapSize) {
1905 // Small physical memory, so use a minimum fraction of it for the heap
1906 reasonable_max = reasonable_min;
1907 } else {
1908 // Not-small physical memory, so require a heap at least
1909 // as large as MaxHeapSize
1910 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1911 }
1912
1913 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1914 // Limit the heap size to ErgoHeapSizeLimit
1915 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1916 }
1917 if (UseCompressedOops) {
1918 // Limit the heap size to the maximum possible when using compressed oops
1919 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1920
1921 // HeapBaseMinAddress can be greater than default but not less than.
1922 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1923 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1924 // matches compressed oops printing flags
1925 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1926 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1927 DefaultHeapBaseMinAddress,
1928 DefaultHeapBaseMinAddress/G,
1929 HeapBaseMinAddress);
1930 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1931 }
1932 }
1933
1934 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1935 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1936 // but it should be not less than default MaxHeapSize.
1937 max_coop_heap -= HeapBaseMinAddress;
1938 }
1939 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1940 }
1941 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1942
1943 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1944 // An initial heap size was specified on the command line,
1945 // so be sure that the maximum size is consistent. Done
1946 // after call to limit_by_allocatable_memory because that
1947 // method might reduce the allocation size.
1948 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1949 }
1950
1951 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1952 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1953 }
1954
1955 // If the minimum or initial heap_size have not been set or requested to be set
1956 // ergonomically, set them accordingly.
1957 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1958 julong reasonable_minimum = (julong)(OldSize + NewSize);
1959
1960 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1961
1962 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1963
1964 if (InitialHeapSize == 0) {
1965 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1966
1967 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1968 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1969
1970 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1971
1972 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1973 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1974 }
1975 // If the minimum heap size has not been set (via -Xms),
1976 // synchronize with InitialHeapSize to avoid errors with the default value.
1977 if (min_heap_size() == 0) {
1978 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1979 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1980 }
1981 }
1982 }
1983
1984 // This option inspects the machine and attempts to set various
1985 // parameters to be optimal for long-running, memory allocation
1986 // intensive jobs. It is intended for machines with large
1987 // amounts of cpu and memory.
1988 jint Arguments::set_aggressive_heap_flags() {
1989 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1990 // VM, but we may not be able to represent the total physical memory
1991 // available (like having 8gb of memory on a box but using a 32bit VM).
1992 // Thus, we need to make sure we're using a julong for intermediate
1993 // calculations.
1994 julong initHeapSize;
1995 julong total_memory = os::physical_memory();
1996
1997 if (total_memory < (julong) 256 * M) {
1998 jio_fprintf(defaultStream::error_stream(),
1999 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2000 vm_exit(1);
2001 }
2002
2003 // The heap size is half of available memory, or (at most)
2004 // all of possible memory less 160mb (leaving room for the OS
2005 // when using ISM). This is the maximum; because adaptive sizing
2006 // is turned on below, the actual space used may be smaller.
2007
2008 initHeapSize = MIN2(total_memory / (julong) 2,
2009 total_memory - (julong) 160 * M);
2010
2011 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2012
2013 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2014 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2015 return JNI_EINVAL;
2016 }
2017 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2018 return JNI_EINVAL;
2019 }
2020 // Currently the minimum size and the initial heap sizes are the same.
2021 set_min_heap_size(initHeapSize);
2022 }
2023 if (FLAG_IS_DEFAULT(NewSize)) {
2024 // Make the young generation 3/8ths of the total heap.
2025 if (FLAG_SET_CMDLINE(size_t, NewSize,
2026 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2027 return JNI_EINVAL;
2028 }
2029 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2030 return JNI_EINVAL;
2031 }
2032 }
2033
2034 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2035 FLAG_SET_DEFAULT(UseLargePages, true);
2036 #endif
2037
2038 // Increase some data structure sizes for efficiency
2039 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2040 return JNI_EINVAL;
2041 }
2042 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2043 return JNI_EINVAL;
2044 }
2045 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2046 return JNI_EINVAL;
2047 }
2048
2049 // See the OldPLABSize comment below, but replace 'after promotion'
2050 // with 'after copying'. YoungPLABSize is the size of the survivor
2051 // space per-gc-thread buffers. The default is 4kw.
2052 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2053 return JNI_EINVAL;
2054 }
2055
2056 // OldPLABSize is the size of the buffers in the old gen that
2057 // UseParallelGC uses to promote live data that doesn't fit in the
2058 // survivor spaces. At any given time, there's one for each gc thread.
2059 // The default size is 1kw. These buffers are rarely used, since the
2060 // survivor spaces are usually big enough. For specjbb, however, there
2061 // are occasions when there's lots of live data in the young gen
2062 // and we end up promoting some of it. We don't have a definite
2063 // explanation for why bumping OldPLABSize helps, but the theory
2064 // is that a bigger PLAB results in retaining something like the
2065 // original allocation order after promotion, which improves mutator
2066 // locality. A minor effect may be that larger PLABs reduce the
2067 // number of PLAB allocation events during gc. The value of 8kw
2068 // was arrived at by experimenting with specjbb.
2069 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2070 return JNI_EINVAL;
2071 }
2072
2073 // Enable parallel GC and adaptive generation sizing
2074 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2075 return JNI_EINVAL;
2076 }
2077
2078 // Encourage steady state memory management
2079 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2080 return JNI_EINVAL;
2081 }
2082
2083 // This appears to improve mutator locality
2084 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2085 return JNI_EINVAL;
2086 }
2087
2088 // Get around early Solaris scheduling bug
2089 // (affinity vs other jobs on system)
2090 // but disallow DR and offlining (5008695).
2091 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2092 return JNI_EINVAL;
2093 }
2094
2095 return JNI_OK;
2096 }
2097
2098 // This must be called after ergonomics.
2099 void Arguments::set_bytecode_flags() {
2100 if (!RewriteBytecodes) {
2101 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2102 }
2103 }
2104
2105 // Aggressive optimization flags -XX:+AggressiveOpts
2106 jint Arguments::set_aggressive_opts_flags() {
2107 #ifdef COMPILER2
2108 if (AggressiveUnboxing) {
2109 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2110 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2111 } else if (!EliminateAutoBox) {
2112 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2113 AggressiveUnboxing = false;
2114 }
2115 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2116 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2117 } else if (!DoEscapeAnalysis) {
2118 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2119 AggressiveUnboxing = false;
2120 }
2121 }
2122 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2123 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2124 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2125 }
2126 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2127 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2128 }
2129
2130 // Feed the cache size setting into the JDK
2131 char buffer[1024];
2132 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2133 if (!add_property(buffer)) {
2134 return JNI_ENOMEM;
2135 }
2136 }
2137 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2138 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2139 }
2140 #endif
2141
2142 if (AggressiveOpts) {
2143 // Sample flag setting code
2144 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2145 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2146 // }
2147 }
2148
2149 return JNI_OK;
2150 }
2151
2152 //===========================================================================================================
2153 // Parsing of java.compiler property
2154
2155 void Arguments::process_java_compiler_argument(const char* arg) {
2156 // For backwards compatibility, Djava.compiler=NONE or ""
2157 // causes us to switch to -Xint mode UNLESS -Xdebug
2158 // is also specified.
2159 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2160 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2161 }
2162 }
2163
2164 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2165 _sun_java_launcher = os::strdup_check_oom(launcher);
2166 }
2167
2168 bool Arguments::created_by_java_launcher() {
2169 assert(_sun_java_launcher != NULL, "property must have value");
2170 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2171 }
2172
2173 bool Arguments::sun_java_launcher_is_altjvm() {
2174 return _sun_java_launcher_is_altjvm;
2175 }
2176
2177 //===========================================================================================================
2178 // Parsing of main arguments
2179
2180 #if INCLUDE_JVMCI
2181 // Check consistency of jvmci vm argument settings.
2182 bool Arguments::check_jvmci_args_consistency() {
2183 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2184 }
2185 #endif //INCLUDE_JVMCI
2186
2187 // Check consistency of GC selection
2188 bool Arguments::check_gc_consistency() {
2189 // Ensure that the user has not selected conflicting sets
2190 // of collectors.
2191 uint i = 0;
2192 if (UseSerialGC) i++;
2193 if (UseConcMarkSweepGC) i++;
2194 if (UseParallelGC || UseParallelOldGC) i++;
2195 if (UseG1GC) i++;
2196 if (i > 1) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "Conflicting collector combinations in option list; "
2199 "please refer to the release notes for the combinations "
2200 "allowed\n");
2201 return false;
2202 }
2203
2204 return true;
2205 }
2206
2207 // Check the consistency of vm_init_args
2208 bool Arguments::check_vm_args_consistency() {
2209 // Method for adding checks for flag consistency.
2210 // The intent is to warn the user of all possible conflicts,
2211 // before returning an error.
2212 // Note: Needs platform-dependent factoring.
2213 bool status = true;
2214
2215 if (TLABRefillWasteFraction == 0) {
2216 jio_fprintf(defaultStream::error_stream(),
2217 "TLABRefillWasteFraction should be a denominator, "
2218 "not " SIZE_FORMAT "\n",
2219 TLABRefillWasteFraction);
2220 status = false;
2221 }
2222
2223 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2224 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2225 }
2226
2227 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2228 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2229 }
2230
2231 if (GCTimeLimit == 100) {
2232 // Turn off gc-overhead-limit-exceeded checks
2233 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2234 }
2235
2236 status = status && check_gc_consistency();
2237
2238 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2239 // insists that we hold the requisite locks so that the iteration is
2240 // MT-safe. For the verification at start-up and shut-down, we don't
2241 // yet have a good way of acquiring and releasing these locks,
2242 // which are not visible at the CollectedHeap level. We want to
2243 // be able to acquire these locks and then do the iteration rather
2244 // than just disable the lock verification. This will be fixed under
2245 // bug 4788986.
2246 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2247 if (VerifyDuringStartup) {
2248 warning("Heap verification at start-up disabled "
2249 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2250 VerifyDuringStartup = false; // Disable verification at start-up
2251 }
2252
2253 if (VerifyBeforeExit) {
2254 warning("Heap verification at shutdown disabled "
2255 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2256 VerifyBeforeExit = false; // Disable verification at shutdown
2257 }
2258 }
2259
2260 if (PrintNMTStatistics) {
2261 #if INCLUDE_NMT
2262 if (MemTracker::tracking_level() == NMT_off) {
2263 #endif // INCLUDE_NMT
2264 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2265 PrintNMTStatistics = false;
2266 #if INCLUDE_NMT
2267 }
2268 #endif
2269 }
2270
2271 #if INCLUDE_JVMCI
2272 status = status && check_jvmci_args_consistency();
2273
2274 if (EnableJVMCI) {
2275 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2276 AddProperty, UnwriteableProperty, InternalProperty);
2277
2278 if (!ScavengeRootsInCode) {
2279 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2280 ScavengeRootsInCode = 1;
2281 }
2282 }
2283 #endif
2284
2285 // Check lower bounds of the code cache
2286 // Template Interpreter code is approximately 3X larger in debug builds.
2287 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2288 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2291 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2292 status = false;
2293 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2294 jio_fprintf(defaultStream::error_stream(),
2295 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2296 min_code_cache_size/K);
2297 status = false;
2298 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2299 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2300 jio_fprintf(defaultStream::error_stream(),
2301 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2302 CODE_CACHE_SIZE_LIMIT/M);
2303 status = false;
2304 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2305 jio_fprintf(defaultStream::error_stream(),
2306 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2307 min_code_cache_size/K);
2308 status = false;
2309 }
2310
2311 #ifdef _LP64
2312 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2313 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2314 }
2315 #endif
2316
2317 #ifndef SUPPORT_RESERVED_STACK_AREA
2318 if (StackReservedPages != 0) {
2319 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2320 warning("Reserved Stack Area not supported on this platform");
2321 }
2322 #endif
2323
2324 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2325 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2326 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2327 }
2328 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2329 }
2330 if (UseCompiler && is_interpreter_only()) {
2331 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2332 warning("UseCompiler disabled due to -Xint.");
2333 }
2334 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2335 }
2336 #ifdef COMPILER2
2337 if (PostLoopMultiversioning && !RangeCheckElimination) {
2338 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2339 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2340 }
2341 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2342 }
2343 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2344 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2345 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2346 }
2347 LoopStripMiningIter = 1;
2348 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2349 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2350 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2351 }
2352 LoopStripMiningIter = 0;
2353 }
2354 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2355 // blind guess
2356 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2357 }
2358 #endif
2359 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2360 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2361 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2362 }
2363 }
2364 return status;
2365 }
2366
2367 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2368 const char* option_type) {
2369 if (ignore) return false;
2370
2371 const char* spacer = " ";
2372 if (option_type == NULL) {
2373 option_type = ++spacer; // Set both to the empty string.
2374 }
2375
2376 if (os::obsolete_option(option)) {
2377 jio_fprintf(defaultStream::error_stream(),
2378 "Obsolete %s%soption: %s\n", option_type, spacer,
2379 option->optionString);
2380 return false;
2381 } else {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Unrecognized %s%soption: %s\n", option_type, spacer,
2384 option->optionString);
2385 return true;
2386 }
2387 }
2388
2389 static const char* user_assertion_options[] = {
2390 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2391 };
2392
2393 static const char* system_assertion_options[] = {
2394 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2395 };
2396
2397 bool Arguments::parse_uintx(const char* value,
2398 uintx* uintx_arg,
2399 uintx min_size) {
2400
2401 // Check the sign first since atojulong() parses only unsigned values.
2402 bool value_is_positive = !(*value == '-');
2403
2404 if (value_is_positive) {
2405 julong n;
2406 bool good_return = atojulong(value, &n);
2407 if (good_return) {
2408 bool above_minimum = n >= min_size;
2409 bool value_is_too_large = n > max_uintx;
2410
2411 if (above_minimum && !value_is_too_large) {
2412 *uintx_arg = n;
2413 return true;
2414 }
2415 }
2416 }
2417 return false;
2418 }
2419
2420 unsigned int addreads_count = 0;
2421 unsigned int addexports_count = 0;
2422 unsigned int addopens_count = 0;
2423 unsigned int addmods_count = 0;
2424 unsigned int patch_mod_count = 0;
2425
2426 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2427 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2428 char* property = AllocateHeap(prop_len, mtArguments);
2429 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2430 if (ret < 0 || ret >= (int)prop_len) {
2431 FreeHeap(property);
2432 return false;
2433 }
2434 bool added = add_property(property, UnwriteableProperty, internal);
2435 FreeHeap(property);
2436 return added;
2437 }
2438
2439 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2440 const unsigned int props_count_limit = 1000;
2441 const int max_digits = 3;
2442 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2443
2444 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2445 if (count < props_count_limit) {
2446 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2447 char* property = AllocateHeap(prop_len, mtArguments);
2448 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2449 if (ret < 0 || ret >= (int)prop_len) {
2450 FreeHeap(property);
2451 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2452 return false;
2453 }
2454 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2455 FreeHeap(property);
2456 return added;
2457 }
2458
2459 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2460 return false;
2461 }
2462
2463 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2464 julong* long_arg,
2465 julong min_size,
2466 julong max_size) {
2467 if (!atojulong(s, long_arg)) return arg_unreadable;
2468 return check_memory_size(*long_arg, min_size, max_size);
2469 }
2470
2471 // Parse JavaVMInitArgs structure
2472
2473 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2474 const JavaVMInitArgs *java_options_args,
2475 const JavaVMInitArgs *cmd_line_args) {
2476 bool patch_mod_javabase = false;
2477
2478 // Save default settings for some mode flags
2479 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2480 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2481 Arguments::_ClipInlining = ClipInlining;
2482 Arguments::_BackgroundCompilation = BackgroundCompilation;
2483 if (TieredCompilation) {
2484 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2485 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2486 }
2487
2488 // Setup flags for mixed which is the default
2489 set_mode_flags(_mixed);
2490
2491 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2492 // variable (if present).
2493 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2494 if (result != JNI_OK) {
2495 return result;
2496 }
2497
2498 // Parse args structure generated from the command line flags.
2499 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2500 if (result != JNI_OK) {
2501 return result;
2502 }
2503
2504 // Parse args structure generated from the _JAVA_OPTIONS environment
2505 // variable (if present) (mimics classic VM)
2506 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2507 if (result != JNI_OK) {
2508 return result;
2509 }
2510
2511 // We need to ensure processor and memory resources have been properly
2512 // configured - which may rely on arguments we just processed - before
2513 // doing the final argument processing. Any argument processing that
2514 // needs to know about processor and memory resources must occur after
2515 // this point.
2516
2517 os::init_container_support();
2518
2519 // Do final processing now that all arguments have been parsed
2520 result = finalize_vm_init_args(patch_mod_javabase);
2521 if (result != JNI_OK) {
2522 return result;
2523 }
2524
2525 return JNI_OK;
2526 }
2527
2528 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2529 // represents a valid JDWP agent. is_path==true denotes that we
2530 // are dealing with -agentpath (case where name is a path), otherwise with
2531 // -agentlib
2532 bool valid_jdwp_agent(char *name, bool is_path) {
2533 char *_name;
2534 const char *_jdwp = "jdwp";
2535 size_t _len_jdwp, _len_prefix;
2536
2537 if (is_path) {
2538 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2539 return false;
2540 }
2541
2542 _name++; // skip past last path separator
2543 _len_prefix = strlen(JNI_LIB_PREFIX);
2544
2545 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2546 return false;
2547 }
2548
2549 _name += _len_prefix;
2550 _len_jdwp = strlen(_jdwp);
2551
2552 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2553 _name += _len_jdwp;
2554 }
2555 else {
2556 return false;
2557 }
2558
2559 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2560 return false;
2561 }
2562
2563 return true;
2564 }
2565
2566 if (strcmp(name, _jdwp) == 0) {
2567 return true;
2568 }
2569
2570 return false;
2571 }
2572
2573 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2574 // --patch-module=<module>=<file>(<pathsep><file>)*
2575 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2576 // Find the equal sign between the module name and the path specification
2577 const char* module_equal = strchr(patch_mod_tail, '=');
2578 if (module_equal == NULL) {
2579 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2580 return JNI_ERR;
2581 } else {
2582 // Pick out the module name
2583 size_t module_len = module_equal - patch_mod_tail;
2584 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2585 if (module_name != NULL) {
2586 memcpy(module_name, patch_mod_tail, module_len);
2587 *(module_name + module_len) = '\0';
2588 // The path piece begins one past the module_equal sign
2589 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2590 FREE_C_HEAP_ARRAY(char, module_name);
2591 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2592 return JNI_ENOMEM;
2593 }
2594 } else {
2595 return JNI_ENOMEM;
2596 }
2597 }
2598 return JNI_OK;
2599 }
2600
2601 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2602 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2603 // The min and max sizes match the values in globals.hpp, but scaled
2604 // with K. The values have been chosen so that alignment with page
2605 // size doesn't change the max value, which makes the conversions
2606 // back and forth between Xss value and ThreadStackSize value easier.
2607 // The values have also been chosen to fit inside a 32-bit signed type.
2608 const julong min_ThreadStackSize = 0;
2609 const julong max_ThreadStackSize = 1 * M;
2610
2611 const julong min_size = min_ThreadStackSize * K;
2612 const julong max_size = max_ThreadStackSize * K;
2613
2614 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2615
2616 julong size = 0;
2617 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2618 if (errcode != arg_in_range) {
2619 bool silent = (option == NULL); // Allow testing to silence error messages
2620 if (!silent) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Invalid thread stack size: %s\n", option->optionString);
2623 describe_range_error(errcode);
2624 }
2625 return JNI_EINVAL;
2626 }
2627
2628 // Internally track ThreadStackSize in units of 1024 bytes.
2629 const julong size_aligned = align_up(size, K);
2630 assert(size <= size_aligned,
2631 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2632 size, size_aligned);
2633
2634 const julong size_in_K = size_aligned / K;
2635 assert(size_in_K < (julong)max_intx,
2636 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2637 size_in_K);
2638
2639 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2640 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2641 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2642 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2643 max_expanded, size_in_K);
2644
2645 *out_ThreadStackSize = (intx)size_in_K;
2646
2647 return JNI_OK;
2648 }
2649
2650 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2651 // For match_option to return remaining or value part of option string
2652 const char* tail;
2653
2654 // iterate over arguments
2655 for (int index = 0; index < args->nOptions; index++) {
2656 bool is_absolute_path = false; // for -agentpath vs -agentlib
2657
2658 const JavaVMOption* option = args->options + index;
2659
2660 if (!match_option(option, "-Djava.class.path", &tail) &&
2661 !match_option(option, "-Dsun.java.command", &tail) &&
2662 !match_option(option, "-Dsun.java.launcher", &tail)) {
2663
2664 // add all jvm options to the jvm_args string. This string
2665 // is used later to set the java.vm.args PerfData string constant.
2666 // the -Djava.class.path and the -Dsun.java.command options are
2667 // omitted from jvm_args string as each have their own PerfData
2668 // string constant object.
2669 build_jvm_args(option->optionString);
2670 }
2671
2672 // -verbose:[class/module/gc/jni]
2673 if (match_option(option, "-verbose", &tail)) {
2674 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2675 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2676 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2677 } else if (!strcmp(tail, ":module")) {
2678 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2679 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2680 } else if (!strcmp(tail, ":gc")) {
2681 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2682 } else if (!strcmp(tail, ":jni")) {
2683 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 }
2687 // -da / -ea / -disableassertions / -enableassertions
2688 // These accept an optional class/package name separated by a colon, e.g.,
2689 // -da:java.lang.Thread.
2690 } else if (match_option(option, user_assertion_options, &tail, true)) {
2691 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2692 if (*tail == '\0') {
2693 JavaAssertions::setUserClassDefault(enable);
2694 } else {
2695 assert(*tail == ':', "bogus match by match_option()");
2696 JavaAssertions::addOption(tail + 1, enable);
2697 }
2698 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2699 } else if (match_option(option, system_assertion_options, &tail, false)) {
2700 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2701 JavaAssertions::setSystemClassDefault(enable);
2702 // -bootclasspath:
2703 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Xbootclasspath is no longer a supported option.\n");
2706 return JNI_EINVAL;
2707 // -bootclasspath/a:
2708 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2709 Arguments::append_sysclasspath(tail);
2710 // -bootclasspath/p:
2711 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2712 jio_fprintf(defaultStream::output_stream(),
2713 "-Xbootclasspath/p is no longer a supported option.\n");
2714 return JNI_EINVAL;
2715 // -Xrun
2716 } else if (match_option(option, "-Xrun", &tail)) {
2717 if (tail != NULL) {
2718 const char* pos = strchr(tail, ':');
2719 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2720 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2721 jio_snprintf(name, len + 1, "%s", tail);
2722
2723 char *options = NULL;
2724 if(pos != NULL) {
2725 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2726 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2727 }
2728 #if !INCLUDE_JVMTI
2729 if (strcmp(name, "jdwp") == 0) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Debugging agents are not supported in this VM\n");
2732 return JNI_ERR;
2733 }
2734 #endif // !INCLUDE_JVMTI
2735 add_init_library(name, options);
2736 }
2737 } else if (match_option(option, "--add-reads=", &tail)) {
2738 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2739 return JNI_ENOMEM;
2740 }
2741 } else if (match_option(option, "--add-exports=", &tail)) {
2742 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2743 return JNI_ENOMEM;
2744 }
2745 } else if (match_option(option, "--add-opens=", &tail)) {
2746 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2747 return JNI_ENOMEM;
2748 }
2749 } else if (match_option(option, "--add-modules=", &tail)) {
2750 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2751 return JNI_ENOMEM;
2752 }
2753 } else if (match_option(option, "--limit-modules=", &tail)) {
2754 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2755 return JNI_ENOMEM;
2756 }
2757 } else if (match_option(option, "--module-path=", &tail)) {
2758 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2759 return JNI_ENOMEM;
2760 }
2761 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2762 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2763 return JNI_ENOMEM;
2764 }
2765 } else if (match_option(option, "--patch-module=", &tail)) {
2766 // --patch-module=<module>=<file>(<pathsep><file>)*
2767 int res = process_patch_mod_option(tail, patch_mod_javabase);
2768 if (res != JNI_OK) {
2769 return res;
2770 }
2771 } else if (match_option(option, "--illegal-access=", &tail)) {
2772 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2773 return JNI_ENOMEM;
2774 }
2775 // -agentlib and -agentpath
2776 } else if (match_option(option, "-agentlib:", &tail) ||
2777 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2778 if(tail != NULL) {
2779 const char* pos = strchr(tail, '=');
2780 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2781 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2782 name[len] = '\0';
2783
2784 char *options = NULL;
2785 if(pos != NULL) {
2786 options = os::strdup_check_oom(pos + 1, mtArguments);
2787 }
2788 #if !INCLUDE_JVMTI
2789 if (valid_jdwp_agent(name, is_absolute_path)) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Debugging agents are not supported in this VM\n");
2792 return JNI_ERR;
2793 }
2794 #endif // !INCLUDE_JVMTI
2795 add_init_agent(name, options, is_absolute_path);
2796 }
2797 // -javaagent
2798 } else if (match_option(option, "-javaagent:", &tail)) {
2799 #if !INCLUDE_JVMTI
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Instrumentation agents are not supported in this VM\n");
2802 return JNI_ERR;
2803 #else
2804 if (tail != NULL) {
2805 size_t length = strlen(tail) + 1;
2806 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2807 jio_snprintf(options, length, "%s", tail);
2808 add_instrument_agent("instrument", options, false);
2809 // java agents need module java.instrument
2810 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2811 return JNI_ENOMEM;
2812 }
2813 }
2814 #endif // !INCLUDE_JVMTI
2815 // -Xnoclassgc
2816 } else if (match_option(option, "-Xnoclassgc")) {
2817 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 // -Xconcgc
2821 } else if (match_option(option, "-Xconcgc")) {
2822 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2823 return JNI_EINVAL;
2824 }
2825 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2826 // -Xnoconcgc
2827 } else if (match_option(option, "-Xnoconcgc")) {
2828 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2832 // -Xbatch
2833 } else if (match_option(option, "-Xbatch")) {
2834 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 // -Xmn for compatibility with other JVM vendors
2838 } else if (match_option(option, "-Xmn", &tail)) {
2839 julong long_initial_young_size = 0;
2840 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2841 if (errcode != arg_in_range) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid initial young generation size: %s\n", option->optionString);
2844 describe_range_error(errcode);
2845 return JNI_EINVAL;
2846 }
2847 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 // -Xms
2854 } else if (match_option(option, "-Xms", &tail)) {
2855 julong long_initial_heap_size = 0;
2856 // an initial heap size of 0 means automatically determine
2857 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2858 if (errcode != arg_in_range) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Invalid initial heap size: %s\n", option->optionString);
2861 describe_range_error(errcode);
2862 return JNI_EINVAL;
2863 }
2864 set_min_heap_size((size_t)long_initial_heap_size);
2865 // Currently the minimum size and the initial heap sizes are the same.
2866 // Can be overridden with -XX:InitialHeapSize.
2867 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 // -Xmx
2871 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2872 julong long_max_heap_size = 0;
2873 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid maximum heap size: %s\n", option->optionString);
2877 describe_range_error(errcode);
2878 return JNI_EINVAL;
2879 }
2880 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 // Xmaxf
2884 } else if (match_option(option, "-Xmaxf", &tail)) {
2885 char* err;
2886 int maxf = (int)(strtod(tail, &err) * 100);
2887 if (*err != '\0' || *tail == '\0') {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Bad max heap free percentage size: %s\n",
2890 option->optionString);
2891 return JNI_EINVAL;
2892 } else {
2893 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 }
2897 // Xminf
2898 } else if (match_option(option, "-Xminf", &tail)) {
2899 char* err;
2900 int minf = (int)(strtod(tail, &err) * 100);
2901 if (*err != '\0' || *tail == '\0') {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Bad min heap free percentage size: %s\n",
2904 option->optionString);
2905 return JNI_EINVAL;
2906 } else {
2907 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 }
2911 // -Xss
2912 } else if (match_option(option, "-Xss", &tail)) {
2913 intx value = 0;
2914 jint err = parse_xss(option, tail, &value);
2915 if (err != JNI_OK) {
2916 return err;
2917 }
2918 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2922 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2923 julong long_ReservedCodeCacheSize = 0;
2924
2925 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2926 if (errcode != arg_in_range) {
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Invalid maximum code cache size: %s.\n", option->optionString);
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 // -green
2935 } else if (match_option(option, "-green")) {
2936 jio_fprintf(defaultStream::error_stream(),
2937 "Green threads support not available\n");
2938 return JNI_EINVAL;
2939 // -native
2940 } else if (match_option(option, "-native")) {
2941 // HotSpot always uses native threads, ignore silently for compatibility
2942 // -Xrs
2943 } else if (match_option(option, "-Xrs")) {
2944 // Classic/EVM option, new functionality
2945 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 // -Xprof
2949 } else if (match_option(option, "-Xprof")) {
2950 char version[256];
2951 // Obsolete in JDK 10
2952 JDK_Version::jdk(10).to_string(version, sizeof(version));
2953 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2954 // -Xconcurrentio
2955 } else if (match_option(option, "-Xconcurrentio")) {
2956 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2969 return JNI_EINVAL;
2970 }
2971
2972 // -Xinternalversion
2973 } else if (match_option(option, "-Xinternalversion")) {
2974 jio_fprintf(defaultStream::output_stream(), "%s\n",
2975 VM_Version::internal_vm_info_string());
2976 vm_exit(0);
2977 #ifndef PRODUCT
2978 // -Xprintflags
2979 } else if (match_option(option, "-Xprintflags")) {
2980 CommandLineFlags::printFlags(tty, false);
2981 vm_exit(0);
2982 #endif
2983 // -D
2984 } else if (match_option(option, "-D", &tail)) {
2985 const char* value;
2986 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2987 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2988 // abort if -Djava.endorsed.dirs is set
2989 jio_fprintf(defaultStream::output_stream(),
2990 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2991 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2992 return JNI_EINVAL;
2993 }
2994 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2995 *value != '\0' && strcmp(value, "\"\"") != 0) {
2996 // abort if -Djava.ext.dirs is set
2997 jio_fprintf(defaultStream::output_stream(),
2998 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2999 return JNI_EINVAL;
3000 }
3001 // Check for module related properties. They must be set using the modules
3002 // options. For example: use "--add-modules=java.sql", not
3003 // "-Djdk.module.addmods=java.sql"
3004 if (is_internal_module_property(option->optionString + 2)) {
3005 needs_module_property_warning = true;
3006 continue;
3007 }
3008
3009 if (!add_property(tail)) {
3010 return JNI_ENOMEM;
3011 }
3012 // Out of the box management support
3013 if (match_option(option, "-Dcom.sun.management", &tail)) {
3014 #if INCLUDE_MANAGEMENT
3015 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 // management agent in module jdk.management.agent
3019 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3020 return JNI_ENOMEM;
3021 }
3022 #else
3023 jio_fprintf(defaultStream::output_stream(),
3024 "-Dcom.sun.management is not supported in this VM.\n");
3025 return JNI_ERR;
3026 #endif
3027 }
3028 // -Xint
3029 } else if (match_option(option, "-Xint")) {
3030 set_mode_flags(_int);
3031 // -Xmixed
3032 } else if (match_option(option, "-Xmixed")) {
3033 set_mode_flags(_mixed);
3034 // -Xcomp
3035 } else if (match_option(option, "-Xcomp")) {
3036 // for testing the compiler; turn off all flags that inhibit compilation
3037 set_mode_flags(_comp);
3038 // -Xshare:dump
3039 } else if (match_option(option, "-Xshare:dump")) {
3040 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 set_mode_flags(_int); // Prevent compilation, which creates objects
3044 // -Xshare:on
3045 } else if (match_option(option, "-Xshare:on")) {
3046 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3050 return JNI_EINVAL;
3051 }
3052 // -Xshare:auto
3053 } else if (match_option(option, "-Xshare:auto")) {
3054 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xshare:off
3061 } else if (match_option(option, "-Xshare:off")) {
3062 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 // -Xverify
3069 } else if (match_option(option, "-Xverify", &tail)) {
3070 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3071 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 } else if (strcmp(tail, ":remote") == 0) {
3078 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3082 return JNI_EINVAL;
3083 }
3084 } else if (strcmp(tail, ":none") == 0) {
3085 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3086 return JNI_EINVAL;
3087 }
3088 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3092 return JNI_EINVAL;
3093 }
3094 // -Xdebug
3095 } else if (match_option(option, "-Xdebug")) {
3096 // note this flag has been used, then ignore
3097 set_xdebug_mode(true);
3098 // -Xnoagent
3099 } else if (match_option(option, "-Xnoagent")) {
3100 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3101 } else if (match_option(option, "-Xloggc:", &tail)) {
3102 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3103 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3104 _gc_log_filename = os::strdup_check_oom(tail);
3105 } else if (match_option(option, "-Xlog", &tail)) {
3106 bool ret = false;
3107 if (strcmp(tail, ":help") == 0) {
3108 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3109 vm_exit(0);
3110 } else if (strcmp(tail, ":disable") == 0) {
3111 LogConfiguration::disable_logging();
3112 ret = true;
3113 } else if (*tail == '\0') {
3114 ret = LogConfiguration::parse_command_line_arguments();
3115 assert(ret, "-Xlog without arguments should never fail to parse");
3116 } else if (*tail == ':') {
3117 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3118 }
3119 if (ret == false) {
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Invalid -Xlog option '-Xlog%s'\n",
3122 tail);
3123 return JNI_EINVAL;
3124 }
3125 // JNI hooks
3126 } else if (match_option(option, "-Xcheck", &tail)) {
3127 if (!strcmp(tail, ":jni")) {
3128 #if !INCLUDE_JNI_CHECK
3129 warning("JNI CHECKING is not supported in this VM");
3130 #else
3131 CheckJNICalls = true;
3132 #endif // INCLUDE_JNI_CHECK
3133 } else if (is_bad_option(option, args->ignoreUnrecognized,
3134 "check")) {
3135 return JNI_EINVAL;
3136 }
3137 } else if (match_option(option, "vfprintf")) {
3138 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3139 } else if (match_option(option, "exit")) {
3140 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3141 } else if (match_option(option, "abort")) {
3142 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3143 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3144 // and the last option wins.
3145 } else if (match_option(option, "-XX:+NeverTenure")) {
3146 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3156 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3166 uintx max_tenuring_thresh = 0;
3167 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3168 jio_fprintf(defaultStream::error_stream(),
3169 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3170 return JNI_EINVAL;
3171 }
3172
3173 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176
3177 if (MaxTenuringThreshold == 0) {
3178 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3179 return JNI_EINVAL;
3180 }
3181 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 } else {
3185 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 }
3192 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3193 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3197 return JNI_EINVAL;
3198 }
3199 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3200 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3207 #if defined(DTRACE_ENABLED)
3208 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3215 return JNI_EINVAL;
3216 }
3217 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3218 return JNI_EINVAL;
3219 }
3220 #else // defined(DTRACE_ENABLED)
3221 jio_fprintf(defaultStream::error_stream(),
3222 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3223 return JNI_EINVAL;
3224 #endif // defined(DTRACE_ENABLED)
3225 #ifdef ASSERT
3226 } else if (match_option(option, "-XX:+FullGCALot")) {
3227 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 // disable scavenge before parallel mark-compact
3231 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3232 return JNI_EINVAL;
3233 }
3234 #endif
3235 #if !INCLUDE_MANAGEMENT
3236 } else if (match_option(option, "-XX:+ManagementServer")) {
3237 jio_fprintf(defaultStream::error_stream(),
3238 "ManagementServer is not supported in this VM.\n");
3239 return JNI_ERR;
3240 #endif // INCLUDE_MANAGEMENT
3241 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3242 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3243 // already been handled
3244 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3245 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3246 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3247 return JNI_EINVAL;
3248 }
3249 }
3250 // Unknown option
3251 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3252 return JNI_ERR;
3253 }
3254 }
3255
3256 // PrintSharedArchiveAndExit will turn on
3257 // -Xshare:on
3258 // -Xlog:class+path=info
3259 if (PrintSharedArchiveAndExit) {
3260 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3261 return JNI_EINVAL;
3262 }
3263 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3264 return JNI_EINVAL;
3265 }
3266 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3267 }
3268
3269 // Change the default value for flags which have different default values
3270 // when working with older JDKs.
3271 #ifdef LINUX
3272 if (JDK_Version::current().compare_major(6) <= 0 &&
3273 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3274 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3275 }
3276 #endif // LINUX
3277 fix_appclasspath();
3278 return JNI_OK;
3279 }
3280
3281 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3282 // For java.base check for duplicate --patch-module options being specified on the command line.
3283 // This check is only required for java.base, all other duplicate module specifications
3284 // will be checked during module system initialization. The module system initialization
3285 // will throw an ExceptionInInitializerError if this situation occurs.
3286 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3287 if (*patch_mod_javabase) {
3288 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3289 } else {
3290 *patch_mod_javabase = true;
3291 }
3292 }
3293
3294 // Create GrowableArray lazily, only if --patch-module has been specified
3295 if (_patch_mod_prefix == NULL) {
3296 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3297 }
3298
3299 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3300 }
3301
3302 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3303 //
3304 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3305 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3306 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3307 // path is treated as the current directory.
3308 //
3309 // This causes problems with CDS, which requires that all directories specified in the classpath
3310 // must be empty. In most cases, applications do NOT want to load classes from the current
3311 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3312 // scripts compatible with CDS.
3313 void Arguments::fix_appclasspath() {
3314 if (IgnoreEmptyClassPaths) {
3315 const char separator = *os::path_separator();
3316 const char* src = _java_class_path->value();
3317
3318 // skip over all the leading empty paths
3319 while (*src == separator) {
3320 src ++;
3321 }
3322
3323 char* copy = os::strdup_check_oom(src, mtArguments);
3324
3325 // trim all trailing empty paths
3326 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3327 *tail = '\0';
3328 }
3329
3330 char from[3] = {separator, separator, '\0'};
3331 char to [2] = {separator, '\0'};
3332 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3333 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3334 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3335 }
3336
3337 _java_class_path->set_writeable_value(copy);
3338 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3339 }
3340 }
3341
3342 static bool has_jar_files(const char* directory) {
3343 DIR* dir = os::opendir(directory);
3344 if (dir == NULL) return false;
3345
3346 struct dirent *entry;
3347 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3348 bool hasJarFile = false;
3349 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3350 const char* name = entry->d_name;
3351 const char* ext = name + strlen(name) - 4;
3352 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3353 }
3354 FREE_C_HEAP_ARRAY(char, dbuf);
3355 os::closedir(dir);
3356 return hasJarFile ;
3357 }
3358
3359 static int check_non_empty_dirs(const char* path) {
3360 const char separator = *os::path_separator();
3361 const char* const end = path + strlen(path);
3362 int nonEmptyDirs = 0;
3363 while (path < end) {
3364 const char* tmp_end = strchr(path, separator);
3365 if (tmp_end == NULL) {
3366 if (has_jar_files(path)) {
3367 nonEmptyDirs++;
3368 jio_fprintf(defaultStream::output_stream(),
3369 "Non-empty directory: %s\n", path);
3370 }
3371 path = end;
3372 } else {
3373 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3374 memcpy(dirpath, path, tmp_end - path);
3375 dirpath[tmp_end - path] = '\0';
3376 if (has_jar_files(dirpath)) {
3377 nonEmptyDirs++;
3378 jio_fprintf(defaultStream::output_stream(),
3379 "Non-empty directory: %s\n", dirpath);
3380 }
3381 FREE_C_HEAP_ARRAY(char, dirpath);
3382 path = tmp_end + 1;
3383 }
3384 }
3385 return nonEmptyDirs;
3386 }
3387
3388 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3389 // check if the default lib/endorsed directory exists; if so, error
3390 char path[JVM_MAXPATHLEN];
3391 const char* fileSep = os::file_separator();
3392 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3393
3394 if (CheckEndorsedAndExtDirs) {
3395 int nonEmptyDirs = 0;
3396 // check endorsed directory
3397 nonEmptyDirs += check_non_empty_dirs(path);
3398 // check the extension directories
3399 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3400 if (nonEmptyDirs > 0) {
3401 return JNI_ERR;
3402 }
3403 }
3404
3405 DIR* dir = os::opendir(path);
3406 if (dir != NULL) {
3407 jio_fprintf(defaultStream::output_stream(),
3408 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3409 "in modular form will be supported via the concept of upgradeable modules.\n");
3410 os::closedir(dir);
3411 return JNI_ERR;
3412 }
3413
3414 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3415 dir = os::opendir(path);
3416 if (dir != NULL) {
3417 jio_fprintf(defaultStream::output_stream(),
3418 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3419 "Use -classpath instead.\n.");
3420 os::closedir(dir);
3421 return JNI_ERR;
3422 }
3423
3424 // This must be done after all arguments have been processed
3425 // and the container support has been initialized since AggressiveHeap
3426 // relies on the amount of total memory available.
3427 if (AggressiveHeap) {
3428 jint result = set_aggressive_heap_flags();
3429 if (result != JNI_OK) {
3430 return result;
3431 }
3432 }
3433
3434 // This must be done after all arguments have been processed.
3435 // java_compiler() true means set to "NONE" or empty.
3436 if (java_compiler() && !xdebug_mode()) {
3437 // For backwards compatibility, we switch to interpreted mode if
3438 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3439 // not specified.
3440 set_mode_flags(_int);
3441 }
3442
3443 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3444 // but like -Xint, leave compilation thresholds unaffected.
3445 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3446 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3447 set_mode_flags(_int);
3448 }
3449
3450 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3451 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3452 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3453 }
3454
3455 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3456 // Don't degrade server performance for footprint
3457 if (FLAG_IS_DEFAULT(UseLargePages) &&
3458 MaxHeapSize < LargePageHeapSizeThreshold) {
3459 // No need for large granularity pages w/small heaps.
3460 // Note that large pages are enabled/disabled for both the
3461 // Java heap and the code cache.
3462 FLAG_SET_DEFAULT(UseLargePages, false);
3463 }
3464
3465 #elif defined(COMPILER2)
3466 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3467 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3468 }
3469 #endif
3470
3471 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3472 UNSUPPORTED_OPTION(ProfileInterpreter);
3473 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3474 #endif
3475
3476 #ifndef TIERED
3477 // Tiered compilation is undefined.
3478 UNSUPPORTED_OPTION(TieredCompilation);
3479 #endif
3480
3481 #if INCLUDE_JVMCI
3482 if (EnableJVMCI &&
3483 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3484 return JNI_ENOMEM;
3485 }
3486 #endif
3487
3488 // If we are running in a headless jre, force java.awt.headless property
3489 // to be true unless the property has already been set.
3490 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3491 if (os::is_headless_jre()) {
3492 const char* headless = Arguments::get_property("java.awt.headless");
3493 if (headless == NULL) {
3494 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3495 if (headless_env == NULL) {
3496 if (!add_property("java.awt.headless=true")) {
3497 return JNI_ENOMEM;
3498 }
3499 } else {
3500 char buffer[256];
3501 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3502 if (!add_property(buffer)) {
3503 return JNI_ENOMEM;
3504 }
3505 }
3506 }
3507 }
3508
3509 if (!check_vm_args_consistency()) {
3510 return JNI_ERR;
3511 }
3512
3513 #if INCLUDE_JVMCI
3514 if (UseJVMCICompiler) {
3515 Compilation_mode = CompMode_server;
3516 }
3517 #endif
3518
3519 #if INCLUDE_CDS
3520 if (DumpSharedSpaces) {
3521 // Disable biased locking now as it interferes with the clean up of
3522 // the archived Klasses and Java string objects (at dump time only).
3523 UseBiasedLocking = false;
3524 }
3525 if (UseSharedSpaces && patch_mod_javabase) {
3526 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3527 }
3528 #endif
3529
3530 return JNI_OK;
3531 }
3532
3533 // Helper class for controlling the lifetime of JavaVMInitArgs
3534 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3535 // deleted on the destruction of the ScopedVMInitArgs object.
3536 class ScopedVMInitArgs : public StackObj {
3537 private:
3538 JavaVMInitArgs _args;
3539 char* _container_name;
3540 bool _is_set;
3541 char* _vm_options_file_arg;
3542
3543 public:
3544 ScopedVMInitArgs(const char *container_name) {
3545 _args.version = JNI_VERSION_1_2;
3546 _args.nOptions = 0;
3547 _args.options = NULL;
3548 _args.ignoreUnrecognized = false;
3549 _container_name = (char *)container_name;
3550 _is_set = false;
3551 _vm_options_file_arg = NULL;
3552 }
3553
3554 // Populates the JavaVMInitArgs object represented by this
3555 // ScopedVMInitArgs object with the arguments in options. The
3556 // allocated memory is deleted by the destructor. If this method
3557 // returns anything other than JNI_OK, then this object is in a
3558 // partially constructed state, and should be abandoned.
3559 jint set_args(GrowableArray<JavaVMOption>* options) {
3560 _is_set = true;
3561 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3562 JavaVMOption, options->length(), mtArguments);
3563 if (options_arr == NULL) {
3564 return JNI_ENOMEM;
3565 }
3566 _args.options = options_arr;
3567
3568 for (int i = 0; i < options->length(); i++) {
3569 options_arr[i] = options->at(i);
3570 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3571 if (options_arr[i].optionString == NULL) {
3572 // Rely on the destructor to do cleanup.
3573 _args.nOptions = i;
3574 return JNI_ENOMEM;
3575 }
3576 }
3577
3578 _args.nOptions = options->length();
3579 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3580 return JNI_OK;
3581 }
3582
3583 JavaVMInitArgs* get() { return &_args; }
3584 char* container_name() { return _container_name; }
3585 bool is_set() { return _is_set; }
3586 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3587 char* vm_options_file_arg() { return _vm_options_file_arg; }
3588
3589 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3590 if (_vm_options_file_arg != NULL) {
3591 os::free(_vm_options_file_arg);
3592 }
3593 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3594 }
3595
3596 ~ScopedVMInitArgs() {
3597 if (_vm_options_file_arg != NULL) {
3598 os::free(_vm_options_file_arg);
3599 }
3600 if (_args.options == NULL) return;
3601 for (int i = 0; i < _args.nOptions; i++) {
3602 os::free(_args.options[i].optionString);
3603 }
3604 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3605 }
3606
3607 // Insert options into this option list, to replace option at
3608 // vm_options_file_pos (-XX:VMOptionsFile)
3609 jint insert(const JavaVMInitArgs* args,
3610 const JavaVMInitArgs* args_to_insert,
3611 const int vm_options_file_pos) {
3612 assert(_args.options == NULL, "shouldn't be set yet");
3613 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3614 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3615
3616 int length = args->nOptions + args_to_insert->nOptions - 1;
3617 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3618 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3619 for (int i = 0; i < args->nOptions; i++) {
3620 if (i == vm_options_file_pos) {
3621 // insert the new options starting at the same place as the
3622 // -XX:VMOptionsFile option
3623 for (int j = 0; j < args_to_insert->nOptions; j++) {
3624 options->push(args_to_insert->options[j]);
3625 }
3626 } else {
3627 options->push(args->options[i]);
3628 }
3629 }
3630 // make into options array
3631 jint result = set_args(options);
3632 delete options;
3633 return result;
3634 }
3635 };
3636
3637 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3638 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3639 }
3640
3641 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3642 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3643 }
3644
3645 jint Arguments::parse_options_environment_variable(const char* name,
3646 ScopedVMInitArgs* vm_args) {
3647 char *buffer = ::getenv(name);
3648
3649 // Don't check this environment variable if user has special privileges
3650 // (e.g. unix su command).
3651 if (buffer == NULL || os::have_special_privileges()) {
3652 return JNI_OK;
3653 }
3654
3655 if ((buffer = os::strdup(buffer)) == NULL) {
3656 return JNI_ENOMEM;
3657 }
3658
3659 jio_fprintf(defaultStream::error_stream(),
3660 "Picked up %s: %s\n", name, buffer);
3661
3662 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3663
3664 os::free(buffer);
3665 return retcode;
3666 }
3667
3668 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3669 // read file into buffer
3670 int fd = ::open(file_name, O_RDONLY);
3671 if (fd < 0) {
3672 jio_fprintf(defaultStream::error_stream(),
3673 "Could not open options file '%s'\n",
3674 file_name);
3675 return JNI_ERR;
3676 }
3677
3678 struct stat stbuf;
3679 int retcode = os::stat(file_name, &stbuf);
3680 if (retcode != 0) {
3681 jio_fprintf(defaultStream::error_stream(),
3682 "Could not stat options file '%s'\n",
3683 file_name);
3684 os::close(fd);
3685 return JNI_ERR;
3686 }
3687
3688 if (stbuf.st_size == 0) {
3689 // tell caller there is no option data and that is ok
3690 os::close(fd);
3691 return JNI_OK;
3692 }
3693
3694 // '+ 1' for NULL termination even with max bytes
3695 size_t bytes_alloc = stbuf.st_size + 1;
3696
3697 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3698 if (NULL == buf) {
3699 jio_fprintf(defaultStream::error_stream(),
3700 "Could not allocate read buffer for options file parse\n");
3701 os::close(fd);
3702 return JNI_ENOMEM;
3703 }
3704
3705 memset(buf, 0, bytes_alloc);
3706
3707 // Fill buffer
3708 // Use ::read() instead of os::read because os::read()
3709 // might do a thread state transition
3710 // and it is too early for that here
3711
3712 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3713 os::close(fd);
3714 if (bytes_read < 0) {
3715 FREE_C_HEAP_ARRAY(char, buf);
3716 jio_fprintf(defaultStream::error_stream(),
3717 "Could not read options file '%s'\n", file_name);
3718 return JNI_ERR;
3719 }
3720
3721 if (bytes_read == 0) {
3722 // tell caller there is no option data and that is ok
3723 FREE_C_HEAP_ARRAY(char, buf);
3724 return JNI_OK;
3725 }
3726
3727 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3728
3729 FREE_C_HEAP_ARRAY(char, buf);
3730 return retcode;
3731 }
3732
3733 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3734 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3735
3736 // some pointers to help with parsing
3737 char *buffer_end = buffer + buf_len;
3738 char *opt_hd = buffer;
3739 char *wrt = buffer;
3740 char *rd = buffer;
3741
3742 // parse all options
3743 while (rd < buffer_end) {
3744 // skip leading white space from the input string
3745 while (rd < buffer_end && isspace(*rd)) {
3746 rd++;
3747 }
3748
3749 if (rd >= buffer_end) {
3750 break;
3751 }
3752
3753 // Remember this is where we found the head of the token.
3754 opt_hd = wrt;
3755
3756 // Tokens are strings of non white space characters separated
3757 // by one or more white spaces.
3758 while (rd < buffer_end && !isspace(*rd)) {
3759 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3760 int quote = *rd; // matching quote to look for
3761 rd++; // don't copy open quote
3762 while (rd < buffer_end && *rd != quote) {
3763 // include everything (even spaces)
3764 // up until the close quote
3765 *wrt++ = *rd++; // copy to option string
3766 }
3767
3768 if (rd < buffer_end) {
3769 rd++; // don't copy close quote
3770 } else {
3771 // did not see closing quote
3772 jio_fprintf(defaultStream::error_stream(),
3773 "Unmatched quote in %s\n", name);
3774 delete options;
3775 return JNI_ERR;
3776 }
3777 } else {
3778 *wrt++ = *rd++; // copy to option string
3779 }
3780 }
3781
3782 // steal a white space character and set it to NULL
3783 *wrt++ = '\0';
3784 // We now have a complete token
3785
3786 JavaVMOption option;
3787 option.optionString = opt_hd;
3788 option.extraInfo = NULL;
3789
3790 options->append(option); // Fill in option
3791
3792 rd++; // Advance to next character
3793 }
3794
3795 // Fill out JavaVMInitArgs structure.
3796 jint status = vm_args->set_args(options);
3797
3798 delete options;
3799 return status;
3800 }
3801
3802 void Arguments::set_shared_spaces_flags() {
3803 if (DumpSharedSpaces) {
3804 if (FailOverToOldVerifier) {
3805 // Don't fall back to the old verifier on verification failure. If a
3806 // class fails verification with the split verifier, it might fail the
3807 // CDS runtime verifier constraint check. In that case, we don't want
3808 // to share the class. We only archive classes that pass the split verifier.
3809 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3810 }
3811
3812 if (RequireSharedSpaces) {
3813 warning("Cannot dump shared archive while using shared archive");
3814 }
3815 UseSharedSpaces = false;
3816 #ifdef _LP64
3817 if (!UseCompressedOops || !UseCompressedClassPointers) {
3818 vm_exit_during_initialization(
3819 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3820 }
3821 } else {
3822 if (!UseCompressedOops || !UseCompressedClassPointers) {
3823 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3824 }
3825 #endif
3826 }
3827 }
3828
3829 // Sharing support
3830 // Construct the path to the archive
3831 static char* get_shared_archive_path() {
3832 char *shared_archive_path;
3833 if (SharedArchiveFile == NULL) {
3834 char jvm_path[JVM_MAXPATHLEN];
3835 os::jvm_path(jvm_path, sizeof(jvm_path));
3836 char *end = strrchr(jvm_path, *os::file_separator());
3837 if (end != NULL) *end = '\0';
3838 size_t jvm_path_len = strlen(jvm_path);
3839 size_t file_sep_len = strlen(os::file_separator());
3840 const size_t len = jvm_path_len + file_sep_len + 20;
3841 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3842 if (shared_archive_path != NULL) {
3843 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3844 jvm_path, os::file_separator());
3845 }
3846 } else {
3847 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3848 }
3849 return shared_archive_path;
3850 }
3851
3852 #ifndef PRODUCT
3853 // Determine whether LogVMOutput should be implicitly turned on.
3854 static bool use_vm_log() {
3855 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3856 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3857 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3858 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3859 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3860 return true;
3861 }
3862
3863 #ifdef COMPILER1
3864 if (PrintC1Statistics) {
3865 return true;
3866 }
3867 #endif // COMPILER1
3868
3869 #ifdef COMPILER2
3870 if (PrintOptoAssembly || PrintOptoStatistics) {
3871 return true;
3872 }
3873 #endif // COMPILER2
3874
3875 return false;
3876 }
3877
3878 #endif // PRODUCT
3879
3880 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3881 for (int index = 0; index < args->nOptions; index++) {
3882 const JavaVMOption* option = args->options + index;
3883 const char* tail;
3884 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3885 return true;
3886 }
3887 }
3888 return false;
3889 }
3890
3891 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3892 const char* vm_options_file,
3893 const int vm_options_file_pos,
3894 ScopedVMInitArgs* vm_options_file_args,
3895 ScopedVMInitArgs* args_out) {
3896 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3897 if (code != JNI_OK) {
3898 return code;
3899 }
3900
3901 if (vm_options_file_args->get()->nOptions < 1) {
3902 return JNI_OK;
3903 }
3904
3905 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3906 jio_fprintf(defaultStream::error_stream(),
3907 "A VM options file may not refer to a VM options file. "
3908 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3909 "options file '%s' in options container '%s' is an error.\n",
3910 vm_options_file_args->vm_options_file_arg(),
3911 vm_options_file_args->container_name());
3912 return JNI_EINVAL;
3913 }
3914
3915 return args_out->insert(args, vm_options_file_args->get(),
3916 vm_options_file_pos);
3917 }
3918
3919 // Expand -XX:VMOptionsFile found in args_in as needed.
3920 // mod_args and args_out parameters may return values as needed.
3921 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3922 ScopedVMInitArgs* mod_args,
3923 JavaVMInitArgs** args_out) {
3924 jint code = match_special_option_and_act(args_in, mod_args);
3925 if (code != JNI_OK) {
3926 return code;
3927 }
3928
3929 if (mod_args->is_set()) {
3930 // args_in contains -XX:VMOptionsFile and mod_args contains the
3931 // original options from args_in along with the options expanded
3932 // from the VMOptionsFile. Return a short-hand to the caller.
3933 *args_out = mod_args->get();
3934 } else {
3935 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3936 }
3937 return JNI_OK;
3938 }
3939
3940 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3941 ScopedVMInitArgs* args_out) {
3942 // Remaining part of option string
3943 const char* tail;
3944 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3945
3946 for (int index = 0; index < args->nOptions; index++) {
3947 const JavaVMOption* option = args->options + index;
3948 if (ArgumentsExt::process_options(option)) {
3949 continue;
3950 }
3951 if (match_option(option, "-XX:Flags=", &tail)) {
3952 Arguments::set_jvm_flags_file(tail);
3953 continue;
3954 }
3955 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3956 if (vm_options_file_args.found_vm_options_file_arg()) {
3957 jio_fprintf(defaultStream::error_stream(),
3958 "The option '%s' is already specified in the options "
3959 "container '%s' so the specification of '%s' in the "
3960 "same options container is an error.\n",
3961 vm_options_file_args.vm_options_file_arg(),
3962 vm_options_file_args.container_name(),
3963 option->optionString);
3964 return JNI_EINVAL;
3965 }
3966 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3967 // If there's a VMOptionsFile, parse that
3968 jint code = insert_vm_options_file(args, tail, index,
3969 &vm_options_file_args, args_out);
3970 if (code != JNI_OK) {
3971 return code;
3972 }
3973 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3974 if (args_out->is_set()) {
3975 // The VMOptions file inserted some options so switch 'args'
3976 // to the new set of options, and continue processing which
3977 // preserves "last option wins" semantics.
3978 args = args_out->get();
3979 // The first option from the VMOptionsFile replaces the
3980 // current option. So we back track to process the
3981 // replacement option.
3982 index--;
3983 }
3984 continue;
3985 }
3986 if (match_option(option, "-XX:+PrintVMOptions")) {
3987 PrintVMOptions = true;
3988 continue;
3989 }
3990 if (match_option(option, "-XX:-PrintVMOptions")) {
3991 PrintVMOptions = false;
3992 continue;
3993 }
3994 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3995 IgnoreUnrecognizedVMOptions = true;
3996 continue;
3997 }
3998 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3999 IgnoreUnrecognizedVMOptions = false;
4000 continue;
4001 }
4002 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4003 CommandLineFlags::printFlags(tty, false);
4004 vm_exit(0);
4005 }
4006 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4007 #if INCLUDE_NMT
4008 // The launcher did not setup nmt environment variable properly.
4009 if (!MemTracker::check_launcher_nmt_support(tail)) {
4010 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4011 }
4012
4013 // Verify if nmt option is valid.
4014 if (MemTracker::verify_nmt_option()) {
4015 // Late initialization, still in single-threaded mode.
4016 if (MemTracker::tracking_level() >= NMT_summary) {
4017 MemTracker::init();
4018 }
4019 } else {
4020 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4021 }
4022 continue;
4023 #else
4024 jio_fprintf(defaultStream::error_stream(),
4025 "Native Memory Tracking is not supported in this VM\n");
4026 return JNI_ERR;
4027 #endif
4028 }
4029
4030 #ifndef PRODUCT
4031 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4032 CommandLineFlags::printFlags(tty, true);
4033 vm_exit(0);
4034 }
4035 #endif
4036
4037 if (match_option(option, "-XX:+UseAppCDS")) {
4038 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true);
4039 if (flag->is_diagnostic()) {
4040 flag->clear_diagnostic();
4041 }
4042 continue;
4043 }
4044 }
4045 return JNI_OK;
4046 }
4047
4048 static void print_options(const JavaVMInitArgs *args) {
4049 const char* tail;
4050 for (int index = 0; index < args->nOptions; index++) {
4051 const JavaVMOption *option = args->options + index;
4052 if (match_option(option, "-XX:", &tail)) {
4053 logOption(tail);
4054 }
4055 }
4056 }
4057
4058 bool Arguments::handle_deprecated_print_gc_flags() {
4059 if (PrintGC) {
4060 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4061 }
4062 if (PrintGCDetails) {
4063 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4064 }
4065
4066 if (_gc_log_filename != NULL) {
4067 // -Xloggc was used to specify a filename
4068 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4069
4070 LogTarget(Error, logging) target;
4071 LogStream errstream(target);
4072 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4073 } else if (PrintGC || PrintGCDetails) {
4074 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4075 }
4076 return true;
4077 }
4078
4079 void Arguments::handle_extra_cms_flags(const char* msg) {
4080 SpecialFlag flag;
4081 const char *flag_name = "UseConcMarkSweepGC";
4082 if (lookup_special_flag(flag_name, flag)) {
4083 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4084 warning("%s", msg);
4085 }
4086 }
4087
4088 // Parse entry point called from JNI_CreateJavaVM
4089
4090 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4091 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4092
4093 // Initialize ranges, constraints and writeables
4094 CommandLineFlagRangeList::init();
4095 CommandLineFlagConstraintList::init();
4096 CommandLineFlagWriteableList::init();
4097
4098 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4099 const char* hotspotrc = ".hotspotrc";
4100 bool settings_file_specified = false;
4101 bool needs_hotspotrc_warning = false;
4102 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4103 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4104
4105 // Pointers to current working set of containers
4106 JavaVMInitArgs* cur_cmd_args;
4107 JavaVMInitArgs* cur_java_options_args;
4108 JavaVMInitArgs* cur_java_tool_options_args;
4109
4110 // Containers for modified/expanded options
4111 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4112 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4113 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4114
4115
4116 jint code =
4117 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4118 if (code != JNI_OK) {
4119 return code;
4120 }
4121
4122 code = parse_java_options_environment_variable(&initial_java_options_args);
4123 if (code != JNI_OK) {
4124 return code;
4125 }
4126
4127 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4128 &mod_java_tool_options_args,
4129 &cur_java_tool_options_args);
4130 if (code != JNI_OK) {
4131 return code;
4132 }
4133
4134 code = expand_vm_options_as_needed(initial_cmd_args,
4135 &mod_cmd_args,
4136 &cur_cmd_args);
4137 if (code != JNI_OK) {
4138 return code;
4139 }
4140
4141 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4142 &mod_java_options_args,
4143 &cur_java_options_args);
4144 if (code != JNI_OK) {
4145 return code;
4146 }
4147
4148 const char* flags_file = Arguments::get_jvm_flags_file();
4149 settings_file_specified = (flags_file != NULL);
4150
4151 if (IgnoreUnrecognizedVMOptions) {
4152 cur_cmd_args->ignoreUnrecognized = true;
4153 cur_java_tool_options_args->ignoreUnrecognized = true;
4154 cur_java_options_args->ignoreUnrecognized = true;
4155 }
4156
4157 // Parse specified settings file
4158 if (settings_file_specified) {
4159 if (!process_settings_file(flags_file, true,
4160 cur_cmd_args->ignoreUnrecognized)) {
4161 return JNI_EINVAL;
4162 }
4163 } else {
4164 #ifdef ASSERT
4165 // Parse default .hotspotrc settings file
4166 if (!process_settings_file(".hotspotrc", false,
4167 cur_cmd_args->ignoreUnrecognized)) {
4168 return JNI_EINVAL;
4169 }
4170 #else
4171 struct stat buf;
4172 if (os::stat(hotspotrc, &buf) == 0) {
4173 needs_hotspotrc_warning = true;
4174 }
4175 #endif
4176 }
4177
4178 if (PrintVMOptions) {
4179 print_options(cur_java_tool_options_args);
4180 print_options(cur_cmd_args);
4181 print_options(cur_java_options_args);
4182 }
4183
4184 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4185 jint result = parse_vm_init_args(cur_java_tool_options_args,
4186 cur_java_options_args,
4187 cur_cmd_args);
4188
4189 if (result != JNI_OK) {
4190 return result;
4191 }
4192
4193 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4194 SharedArchivePath = get_shared_archive_path();
4195 if (SharedArchivePath == NULL) {
4196 return JNI_ENOMEM;
4197 }
4198
4199 // Set up VerifySharedSpaces
4200 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4201 VerifySharedSpaces = true;
4202 }
4203
4204 // Delay warning until here so that we've had a chance to process
4205 // the -XX:-PrintWarnings flag
4206 if (needs_hotspotrc_warning) {
4207 warning("%s file is present but has been ignored. "
4208 "Run with -XX:Flags=%s to load the file.",
4209 hotspotrc, hotspotrc);
4210 }
4211
4212 if (needs_module_property_warning) {
4213 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4214 " names that are reserved for internal use.");
4215 }
4216
4217 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4218 UNSUPPORTED_OPTION(UseLargePages);
4219 #endif
4220
4221 ArgumentsExt::report_unsupported_options();
4222
4223 #ifndef PRODUCT
4224 if (TraceBytecodesAt != 0) {
4225 TraceBytecodes = true;
4226 }
4227 if (CountCompiledCalls) {
4228 if (UseCounterDecay) {
4229 warning("UseCounterDecay disabled because CountCalls is set");
4230 UseCounterDecay = false;
4231 }
4232 }
4233 #endif // PRODUCT
4234
4235 if (ScavengeRootsInCode == 0) {
4236 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4237 warning("Forcing ScavengeRootsInCode non-zero");
4238 }
4239 ScavengeRootsInCode = 1;
4240 }
4241
4242 if (!handle_deprecated_print_gc_flags()) {
4243 return JNI_EINVAL;
4244 }
4245
4246 // Set object alignment values.
4247 set_object_alignment();
4248
4249 #if !INCLUDE_CDS
4250 if (DumpSharedSpaces || RequireSharedSpaces) {
4251 jio_fprintf(defaultStream::error_stream(),
4252 "Shared spaces are not supported in this VM\n");
4253 return JNI_ERR;
4254 }
4255 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4256 log_is_enabled(Info, cds)) {
4257 warning("Shared spaces are not supported in this VM");
4258 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4259 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4260 }
4261 no_shared_spaces("CDS Disabled");
4262 #endif // INCLUDE_CDS
4263
4264 return JNI_OK;
4265 }
4266
4267 jint Arguments::apply_ergo() {
4268 // Set flags based on ergonomics.
4269 jint result = set_ergonomics_flags();
4270 if (result != JNI_OK) return result;
4271
4272 #if INCLUDE_JVMCI
4273 set_jvmci_specific_flags();
4274 #endif
4275
4276 set_shared_spaces_flags();
4277
4278 // Check the GC selections again.
4279 if (!check_gc_consistency()) {
4280 return JNI_EINVAL;
4281 }
4282
4283 if (TieredCompilation) {
4284 set_tiered_flags();
4285 } else {
4286 int max_compilation_policy_choice = 1;
4287 #ifdef COMPILER2
4288 if (is_server_compilation_mode_vm()) {
4289 max_compilation_policy_choice = 2;
4290 }
4291 #endif
4292 // Check if the policy is valid.
4293 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4294 vm_exit_during_initialization(
4295 "Incompatible compilation policy selected", NULL);
4296 }
4297 // Scale CompileThreshold
4298 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4299 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4300 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4301 }
4302 }
4303
4304 #ifdef COMPILER2
4305 #ifndef PRODUCT
4306 if (PrintIdealGraphLevel > 0) {
4307 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4308 }
4309 #endif
4310 #endif
4311
4312 // Set heap size based on available physical memory
4313 set_heap_size();
4314
4315 ArgumentsExt::set_gc_specific_flags();
4316
4317 // Initialize Metaspace flags and alignments
4318 Metaspace::ergo_initialize();
4319
4320 // Set bytecode rewriting flags
4321 set_bytecode_flags();
4322
4323 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4324 jint code = set_aggressive_opts_flags();
4325 if (code != JNI_OK) {
4326 return code;
4327 }
4328
4329 // Turn off biased locking for locking debug mode flags,
4330 // which are subtly different from each other but neither works with
4331 // biased locking
4332 if (UseHeavyMonitors
4333 #ifdef COMPILER1
4334 || !UseFastLocking
4335 #endif // COMPILER1
4336 #if INCLUDE_JVMCI
4337 || !JVMCIUseFastLocking
4338 #endif
4339 ) {
4340 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4341 // flag set to true on command line; warn the user that they
4342 // can't enable biased locking here
4343 warning("Biased Locking is not supported with locking debug flags"
4344 "; ignoring UseBiasedLocking flag." );
4345 }
4346 UseBiasedLocking = false;
4347 }
4348
4349 #ifdef CC_INTERP
4350 // Clear flags not supported on zero.
4351 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4352 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4353 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4354 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4355 #endif // CC_INTERP
4356
4357 #ifdef COMPILER2
4358 if (!EliminateLocks) {
4359 EliminateNestedLocks = false;
4360 }
4361 if (!Inline) {
4362 IncrementalInline = false;
4363 }
4364 #ifndef PRODUCT
4365 if (!IncrementalInline) {
4366 AlwaysIncrementalInline = false;
4367 }
4368 #endif
4369 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4370 // nothing to use the profiling, turn if off
4371 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4372 }
4373 #endif
4374
4375 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4376 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4377 DebugNonSafepoints = true;
4378 }
4379
4380 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4381 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4382 }
4383
4384 if (UseOnStackReplacement && !UseLoopCounter) {
4385 warning("On-stack-replacement requires loop counters; enabling loop counters");
4386 FLAG_SET_DEFAULT(UseLoopCounter, true);
4387 }
4388
4389 #ifndef PRODUCT
4390 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4391 if (use_vm_log()) {
4392 LogVMOutput = true;
4393 }
4394 }
4395 #endif // PRODUCT
4396
4397 if (PrintCommandLineFlags) {
4398 CommandLineFlags::printSetFlags(tty);
4399 }
4400
4401 // Apply CPU specific policy for the BiasedLocking
4402 if (UseBiasedLocking) {
4403 if (!VM_Version::use_biased_locking() &&
4404 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4405 UseBiasedLocking = false;
4406 }
4407 }
4408 #ifdef COMPILER2
4409 if (!UseBiasedLocking || EmitSync != 0) {
4410 UseOptoBiasInlining = false;
4411 }
4412 #endif
4413
4414 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4415 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4416 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4417 } else {
4418 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4419 }
4420
4421 return JNI_OK;
4422 }
4423
4424 jint Arguments::adjust_after_os() {
4425 if (UseNUMA) {
4426 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4427 FLAG_SET_ERGO(bool, UseNUMA, false);
4428 } else if (UseParallelGC || UseParallelOldGC) {
4429 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4430 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4431 }
4432 }
4433 // UseNUMAInterleaving is set to ON for all collectors and
4434 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4435 // such as the parallel collector for Linux and Solaris will
4436 // interleave old gen and survivor spaces on top of NUMA
4437 // allocation policy for the eden space.
4438 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4439 // all platforms and ParallelGC on Windows will interleave all
4440 // of the heap spaces across NUMA nodes.
4441 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4442 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4443 }
4444 }
4445 return JNI_OK;
4446 }
4447
4448 int Arguments::PropertyList_count(SystemProperty* pl) {
4449 int count = 0;
4450 while(pl != NULL) {
4451 count++;
4452 pl = pl->next();
4453 }
4454 return count;
4455 }
4456
4457 // Return the number of readable properties.
4458 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4459 int count = 0;
4460 while(pl != NULL) {
4461 if (pl->is_readable()) {
4462 count++;
4463 }
4464 pl = pl->next();
4465 }
4466 return count;
4467 }
4468
4469 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4470 assert(key != NULL, "just checking");
4471 SystemProperty* prop;
4472 for (prop = pl; prop != NULL; prop = prop->next()) {
4473 if (strcmp(key, prop->key()) == 0) return prop->value();
4474 }
4475 return NULL;
4476 }
4477
4478 // Return the value of the requested property provided that it is a readable property.
4479 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4480 assert(key != NULL, "just checking");
4481 SystemProperty* prop;
4482 // Return the property value if the keys match and the property is not internal or
4483 // it's the special internal property "jdk.boot.class.path.append".
4484 for (prop = pl; prop != NULL; prop = prop->next()) {
4485 if (strcmp(key, prop->key()) == 0) {
4486 if (!prop->internal()) {
4487 return prop->value();
4488 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4489 return prop->value();
4490 } else {
4491 // Property is internal and not jdk.boot.class.path.append so return NULL.
4492 return NULL;
4493 }
4494 }
4495 }
4496 return NULL;
4497 }
4498
4499 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4500 int count = 0;
4501 const char* ret_val = NULL;
4502
4503 while(pl != NULL) {
4504 if(count >= index) {
4505 ret_val = pl->key();
4506 break;
4507 }
4508 count++;
4509 pl = pl->next();
4510 }
4511
4512 return ret_val;
4513 }
4514
4515 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4516 int count = 0;
4517 char* ret_val = NULL;
4518
4519 while(pl != NULL) {
4520 if(count >= index) {
4521 ret_val = pl->value();
4522 break;
4523 }
4524 count++;
4525 pl = pl->next();
4526 }
4527
4528 return ret_val;
4529 }
4530
4531 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4532 SystemProperty* p = *plist;
4533 if (p == NULL) {
4534 *plist = new_p;
4535 } else {
4536 while (p->next() != NULL) {
4537 p = p->next();
4538 }
4539 p->set_next(new_p);
4540 }
4541 }
4542
4543 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4544 bool writeable, bool internal) {
4545 if (plist == NULL)
4546 return;
4547
4548 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4549 PropertyList_add(plist, new_p);
4550 }
4551
4552 void Arguments::PropertyList_add(SystemProperty *element) {
4553 PropertyList_add(&_system_properties, element);
4554 }
4555
4556 // This add maintains unique property key in the list.
4557 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4558 PropertyAppendable append, PropertyWriteable writeable,
4559 PropertyInternal internal) {
4560 if (plist == NULL)
4561 return;
4562
4563 // If property key exist then update with new value.
4564 SystemProperty* prop;
4565 for (prop = *plist; prop != NULL; prop = prop->next()) {
4566 if (strcmp(k, prop->key()) == 0) {
4567 if (append == AppendProperty) {
4568 prop->append_value(v);
4569 } else {
4570 prop->set_value(v);
4571 }
4572 return;
4573 }
4574 }
4575
4576 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4577 }
4578
4579 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4580 // Returns true if all of the source pointed by src has been copied over to
4581 // the destination buffer pointed by buf. Otherwise, returns false.
4582 // Notes:
4583 // 1. If the length (buflen) of the destination buffer excluding the
4584 // NULL terminator character is not long enough for holding the expanded
4585 // pid characters, it also returns false instead of returning the partially
4586 // expanded one.
4587 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4588 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4589 char* buf, size_t buflen) {
4590 const char* p = src;
4591 char* b = buf;
4592 const char* src_end = &src[srclen];
4593 char* buf_end = &buf[buflen - 1];
4594
4595 while (p < src_end && b < buf_end) {
4596 if (*p == '%') {
4597 switch (*(++p)) {
4598 case '%': // "%%" ==> "%"
4599 *b++ = *p++;
4600 break;
4601 case 'p': { // "%p" ==> current process id
4602 // buf_end points to the character before the last character so
4603 // that we could write '\0' to the end of the buffer.
4604 size_t buf_sz = buf_end - b + 1;
4605 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4606
4607 // if jio_snprintf fails or the buffer is not long enough to hold
4608 // the expanded pid, returns false.
4609 if (ret < 0 || ret >= (int)buf_sz) {
4610 return false;
4611 } else {
4612 b += ret;
4613 assert(*b == '\0', "fail in copy_expand_pid");
4614 if (p == src_end && b == buf_end + 1) {
4615 // reach the end of the buffer.
4616 return true;
4617 }
4618 }
4619 p++;
4620 break;
4621 }
4622 default :
4623 *b++ = '%';
4624 }
4625 } else {
4626 *b++ = *p++;
4627 }
4628 }
4629 *b = '\0';
4630 return (p == src_end); // return false if not all of the source was copied
4631 }