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