1 /*
2 * Copyright (c) 1997, 2022, 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 "cds/filemap.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logConfiguration.hpp"
40 #include "logging/logStream.hpp"
41 #include "logging/logTag.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/flags/jvmFlag.hpp"
48 #include "runtime/flags/jvmFlagAccess.hpp"
49 #include "runtime/flags/jvmFlagLimit.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/safepoint.hpp"
54 #include "runtime/safepointMechanism.hpp"
55 #include "runtime/vm_version.hpp"
56 #include "services/management.hpp"
57 #include "services/nmtCommon.hpp"
58 #include "utilities/align.hpp"
59 #include "utilities/defaultStream.hpp"
60 #include "utilities/macros.hpp"
61 #include "utilities/powerOfTwo.hpp"
62 #include "utilities/stringUtils.hpp"
63 #if INCLUDE_JFR
64 #include "jfr/jfr.hpp"
65 #endif
66
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 size_t Arguments::_conservative_max_heap_alignment = 0;
77 Arguments::Mode Arguments::_mode = _mixed;
78 bool Arguments::_java_compiler = false;
79 bool Arguments::_xdebug_mode = false;
80 const char* Arguments::_java_vendor_url_bug = NULL;
81 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
82 bool Arguments::_sun_java_launcher_is_altjvm = false;
83
84 // These parameters are reset in method parse_vm_init_args()
85 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
86 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
87 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
88 bool Arguments::_ClipInlining = ClipInlining;
89 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
90
91 bool Arguments::_enable_preview = false;
92
93 char* Arguments::SharedArchivePath = NULL;
94 char* Arguments::SharedDynamicArchivePath = NULL;
95
96 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 // These are not set by the JDK's built-in launchers, but they can be set by
102 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
103 // JavaVMOption in jni.h.
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114 SystemProperty *Arguments::_vm_info = NULL;
115
116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
117 PathString *Arguments::_system_boot_class_path = NULL;
118 bool Arguments::_has_jimage = false;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // True if -Xshare:auto option was specified.
123 static bool xshare_auto_cmd_line = false;
124
125 bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138 }
139
140 void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162 }
163
164 PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171 }
172
173 PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178 }
179
180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186 }
187
188 ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197 }
198
199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209 }
210
211 AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317 #define ENABLE_NATIVE_ACCESS "enable.native.access"
318 #define ENABLE_NATIVE_ACCESS_LEN 20
319
320 void Arguments::add_init_library(const char* name, char* options) {
321 _libraryList.add(new AgentLibrary(name, options, false, NULL));
322 }
323
324 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
325 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
326 }
327
328 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
329 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
330 }
331
332 // Late-binding agents not started via arguments
333 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
334 _agentList.add(agentLib);
335 }
336
337 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
338 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
339 return ((strncmp(option, property, len) == 0) &&
340 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
341 }
342
343 // Return true if property starts with "jdk.module." and its ensuing chars match
344 // any of the reserved module properties.
345 // property should be passed without the leading "-D".
346 bool Arguments::is_internal_module_property(const char* property) {
347 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
348 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
349 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
350 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
351 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
352 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
353 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
354 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
355 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
356 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
357 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
358 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
359 return true;
360 }
361 }
362 return false;
363 }
364
365 // Process java launcher properties.
366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
367 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
368 // Must do this before setting up other system properties,
369 // as some of them may depend on launcher type.
370 for (int index = 0; index < args->nOptions; index++) {
371 const JavaVMOption* option = args->options + index;
372 const char* tail;
373
374 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
375 process_java_launcher_argument(tail, option->extraInfo);
376 continue;
377 }
378 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
379 if (strcmp(tail, "true") == 0) {
380 _sun_java_launcher_is_altjvm = true;
381 }
382 continue;
383 }
384 }
385 }
386
387 // Initialize system properties key and value.
388 void Arguments::init_system_properties() {
389
390 // Set up _system_boot_class_path which is not a property but
391 // relies heavily on argument processing and the jdk.boot.class.path.append
392 // property. It is used to store the underlying system boot class path.
393 _system_boot_class_path = new PathString(NULL);
394
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
396 "Java Virtual Machine Specification", false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
400
401 // Initialize the vm.info now, but it will need updating after argument parsing.
402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
403
404 // Following are JVMTI agent writable properties.
405 // Properties values are set to NULL and they are
406 // os specific they are initialized in os::init_system_properties_values().
407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
408 _java_library_path = new SystemProperty("java.library.path", NULL, true);
409 _java_home = new SystemProperty("java.home", NULL, true);
410 _java_class_path = new SystemProperty("java.class.path", "", true);
411 // jdk.boot.class.path.append is a non-writeable, internal property.
412 // It can only be set by either:
413 // - -Xbootclasspath/a:
414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true);
416
417 // Add to System Property list.
418 PropertyList_add(&_system_properties, _sun_boot_library_path);
419 PropertyList_add(&_system_properties, _java_library_path);
420 PropertyList_add(&_system_properties, _java_home);
421 PropertyList_add(&_system_properties, _java_class_path);
422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
423 PropertyList_add(&_system_properties, _vm_info);
424
425 // Set OS specific system properties values
426 os::init_system_properties_values();
427 }
428
429 // Update/Initialize System properties after JDK version number is known
430 void Arguments::init_version_specific_system_properties() {
431 enum { bufsz = 16 };
432 char buffer[bufsz];
433 const char* spec_vendor = "Oracle Corporation";
434 uint32_t spec_version = JDK_Version::current().major_version();
435
436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
437
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.version", buffer, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
444 }
445
446 /*
447 * -XX argument processing:
448 *
449 * -XX arguments are defined in several places, such as:
450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
451 * -XX arguments are parsed in parse_argument().
452 * -XX argument bounds checking is done in check_vm_args_consistency().
453 *
454 * Over time -XX arguments may change. There are mechanisms to handle common cases:
455 *
456 * ALIASED: An option that is simply another name for another option. This is often
457 * part of the process of deprecating a flag, but not all aliases need
458 * to be deprecated.
459 *
460 * Create an alias for an option by adding the old and new option names to the
461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
462 *
463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
464 * support may be removed in the future. Both regular and aliased options may be
465 * deprecated.
466 *
467 * Add a deprecation warning for an option (or alias) by adding an entry in the
468 * "special_jvm_flags" table and setting the "deprecated_in" field.
469 * Often an option "deprecated" in one major release will
470 * be made "obsolete" in the next. In this case the entry should also have its
471 * "obsolete_in" field set.
472 *
473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
474 * on the command line. A warning is printed to let the user know that option might not
475 * be accepted in the future.
476 *
477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
478 * table and setting the "obsolete_in" field.
479 *
480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
481 * to the current JDK version. The system will flatly refuse to admit the existence of
482 * the flag. This allows a flag to die automatically over JDK releases.
483 *
484 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
486 * - Newly obsolete or expired deprecated options should have their global variable
487 * definitions removed (from globals.hpp, etc) and related implementations removed.
488 *
489 * Recommended approach for removing options:
490 *
491 * To remove options commonly used by customers (e.g. product -XX options), use
492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
493 *
494 * To remove internal options (e.g. diagnostic, experimental, develop options), use
495 * a 2-step model adding major release numbers to the obsolete and expire columns.
496 *
497 * To change the name of an option, use the alias table as well as a 2-step
498 * model adding major release numbers to the deprecate and expire columns.
499 * Think twice about aliasing commonly used customer options.
500 *
501 * There are times when it is appropriate to leave a future release number as undefined.
502 *
503 * Tests: Aliases should be tested in VMAliasOptions.java.
504 * Deprecated options should be tested in VMDeprecatedOptions.java.
505 */
506
507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
510 // the command-line as usual, but will issue a warning.
511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
512 // the command-line, while issuing a warning and ignoring the flag value.
513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
514 // existence of the flag.
515 //
516 // MANUAL CLEANUP ON JDK VERSION UPDATES:
517 // This table ensures that the handling of options will update automatically when the JDK
518 // version is incremented, but the source code needs to be cleanup up manually:
519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
520 // variable should be removed, as well as users of the variable.
521 // - As "deprecated" options age into "obsolete" options, move the entry into the
522 // "Obsolete Flags" section of the table.
523 // - All expired options should be removed from the table.
524 static SpecialFlag const special_jvm_flags[] = {
525 // -------------- Deprecated Flags --------------
526 // --- Non-alias flags - sorted by obsolete_in then expired_in:
527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 #ifdef PRODUCT
538 { "UseHeavyMonitors", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
539 #endif
540
541 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
542 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
543 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
544 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
545
546 // -------------- Obsolete Flags - sorted by expired_in --------------
547
548 { "FilterSpuriousWakeups", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
549 { "MinInliningThreshold", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
550 #ifdef ASSERT
551 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
552 #endif
553
554 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
555 // These entries will generate build errors. Their purpose is to test the macros.
556 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
557 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
558 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
559 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
560 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
563 #endif
564
565 { NULL, JDK_Version(0), JDK_Version(0) }
566 };
567
568 // Flags that are aliases for other flags.
569 typedef struct {
570 const char* alias_name;
571 const char* real_name;
572 } AliasedFlag;
573
574 static AliasedFlag const aliased_jvm_flags[] = {
575 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
576 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
577 { NULL, NULL}
578 };
579
580 // Return true if "v" is less than "other", where "other" may be "undefined".
581 static bool version_less_than(JDK_Version v, JDK_Version other) {
582 assert(!v.is_undefined(), "must be defined");
583 if (!other.is_undefined() && v.compare(other) >= 0) {
584 return false;
585 } else {
586 return true;
587 }
588 }
589
590 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
591 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
592 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
593 flag = special_jvm_flags[i];
594 return true;
595 }
596 }
597 return false;
598 }
599
600 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
601 assert(version != NULL, "Must provide a version buffer");
602 SpecialFlag flag;
603 if (lookup_special_flag(flag_name, flag)) {
604 if (!flag.obsolete_in.is_undefined()) {
605 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
606 *version = flag.obsolete_in;
607 // This flag may have been marked for obsoletion in this version, but we may not
608 // have actually removed it yet. Rather than ignoring it as soon as we reach
609 // this version we allow some time for the removal to happen. So if the flag
610 // still actually exists we process it as normal, but issue an adjusted warning.
611 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
612 if (real_flag != NULL) {
613 char version_str[256];
614 version->to_string(version_str, sizeof(version_str));
615 warning("Temporarily processing option %s; support is scheduled for removal in %s",
616 flag_name, version_str);
617 return false;
618 }
619 return true;
620 }
621 }
622 }
623 return false;
624 }
625
626 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
627 assert(version != NULL, "Must provide a version buffer");
628 SpecialFlag flag;
629 if (lookup_special_flag(flag_name, flag)) {
630 if (!flag.deprecated_in.is_undefined()) {
631 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
632 version_less_than(JDK_Version::current(), flag.expired_in)) {
633 *version = flag.deprecated_in;
634 return 1;
635 } else {
636 return -1;
637 }
638 }
639 }
640 return 0;
641 }
642
643 const char* Arguments::real_flag_name(const char *flag_name) {
644 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
645 const AliasedFlag& flag_status = aliased_jvm_flags[i];
646 if (strcmp(flag_status.alias_name, flag_name) == 0) {
647 return flag_status.real_name;
648 }
649 }
650 return flag_name;
651 }
652
653 #ifdef ASSERT
654 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
655 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
656 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
657 return true;
658 }
659 }
660 return false;
661 }
662
663 // Verifies the correctness of the entries in the special_jvm_flags table.
664 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
665 // version being earlier than the deprecation version, then a warning is issued
666 // and verification fails - by returning false. If it is detected that the table
667 // is out of date, with respect to the current version, then ideally a warning is
668 // issued but verification does not fail. This allows the VM to operate when the
669 // version is first updated, without needing to update all the impacted flags at
670 // the same time. In practice we can't issue the warning immediately when the version
671 // is updated as it occurs for every test and some tests are not prepared to handle
672 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
673 // if the check_globals flag is true, and in addition allow a grace period and only
674 // check for stale flags when we hit build 25 (which is far enough into the 6 month
675 // release cycle that all flag updates should have been processed, whilst still
676 // leaving time to make the change before RDP2).
677 // We use a gtest to call this, passing true, so that we can detect stale flags before
678 // the end of the release cycle.
679
680 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
681
682 bool Arguments::verify_special_jvm_flags(bool check_globals) {
683 bool success = true;
684 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
685 const SpecialFlag& flag = special_jvm_flags[i];
686 if (lookup_special_flag(flag.name, i)) {
687 warning("Duplicate special flag declaration \"%s\"", flag.name);
688 success = false;
689 }
690 if (flag.deprecated_in.is_undefined() &&
691 flag.obsolete_in.is_undefined()) {
692 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
693 success = false;
694 }
695
696 if (!flag.deprecated_in.is_undefined()) {
697 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
698 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
699 success = false;
700 }
701
702 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
703 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
704 success = false;
705 }
706 }
707
708 if (!flag.obsolete_in.is_undefined()) {
709 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
710 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
711 success = false;
712 }
713
714 // if flag has become obsolete it should not have a "globals" flag defined anymore.
715 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
716 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
717 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
718 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
719 success = false;
720 }
721 }
722
723 } else if (!flag.expired_in.is_undefined()) {
724 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
725 success = false;
726 }
727
728 if (!flag.expired_in.is_undefined()) {
729 // if flag has become expired it should not have a "globals" flag defined anymore.
730 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
731 !version_less_than(JDK_Version::current(), flag.expired_in)) {
732 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
733 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
734 success = false;
735 }
736 }
737 }
738 }
739 return success;
740 }
741 #endif
742
743 // Parses a size specification string.
744 bool Arguments::atojulong(const char *s, julong* result) {
745 julong n = 0;
746
747 // First char must be a digit. Don't allow negative numbers or leading spaces.
748 if (!isdigit(*s)) {
749 return false;
750 }
751
752 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
753 char* remainder;
754 errno = 0;
755 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
756 if (errno != 0) {
757 return false;
758 }
759
760 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
761 if (remainder == s || strlen(remainder) > 1) {
762 return false;
763 }
764
765 switch (*remainder) {
766 case 'T': case 't':
767 *result = n * G * K;
768 // Check for overflow.
769 if (*result/((julong)G * K) != n) return false;
770 return true;
771 case 'G': case 'g':
772 *result = n * G;
773 if (*result/G != n) return false;
774 return true;
775 case 'M': case 'm':
776 *result = n * M;
777 if (*result/M != n) return false;
778 return true;
779 case 'K': case 'k':
780 *result = n * K;
781 if (*result/K != n) return false;
782 return true;
783 case '\0':
784 *result = n;
785 return true;
786 default:
787 return false;
788 }
789 }
790
791 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
792 if (size < min_size) return arg_too_small;
793 if (size > max_size) return arg_too_big;
794 return arg_in_range;
795 }
796
797 // Describe an argument out of range error
798 void Arguments::describe_range_error(ArgsRange errcode) {
799 switch(errcode) {
800 case arg_too_big:
801 jio_fprintf(defaultStream::error_stream(),
802 "The specified size exceeds the maximum "
803 "representable size.\n");
804 break;
805 case arg_too_small:
806 case arg_unreadable:
807 case arg_in_range:
808 // do nothing for now
809 break;
810 default:
811 ShouldNotReachHere();
812 }
813 }
814
815 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
816 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
817 return true;
818 } else {
819 return false;
820 }
821 }
822
823 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
824 char* end;
825 errno = 0;
826 double v = strtod(value, &end);
827 if ((errno != 0) || (*end != 0)) {
828 return false;
829 }
830
831 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
832 return true;
833 }
834 return false;
835 }
836
837 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) {
838 julong v;
839 int int_v;
840 intx intx_v;
841 bool is_neg = false;
842
843 if (flag == NULL) {
844 return false;
845 }
846
847 // Check the sign first since atojulong() parses only unsigned values.
848 if (*value == '-') {
849 if (!flag->is_intx() && !flag->is_int()) {
850 return false;
851 }
852 value++;
853 is_neg = true;
854 }
855 if (!Arguments::atojulong(value, &v)) {
856 return false;
857 }
858 if (flag->is_int()) {
859 int_v = (int) v;
860 if (is_neg) {
861 int_v = -int_v;
862 }
863 return JVMFlagAccess::set_int(flag, &int_v, origin) == JVMFlag::SUCCESS;
864 } else if (flag->is_uint()) {
865 uint uint_v = (uint) v;
866 return JVMFlagAccess::set_uint(flag, &uint_v, origin) == JVMFlag::SUCCESS;
867 } else if (flag->is_intx()) {
868 intx_v = (intx) v;
869 if (is_neg) {
870 intx_v = -intx_v;
871 }
872 return JVMFlagAccess::set_intx(flag, &intx_v, origin) == JVMFlag::SUCCESS;
873 } else if (flag->is_uintx()) {
874 uintx uintx_v = (uintx) v;
875 return JVMFlagAccess::set_uintx(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
876 } else if (flag->is_uint64_t()) {
877 uint64_t uint64_t_v = (uint64_t) v;
878 return JVMFlagAccess::set_uint64_t(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
879 } else if (flag->is_size_t()) {
880 size_t size_t_v = (size_t) v;
881 return JVMFlagAccess::set_size_t(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
882 } else if (flag->is_double()) {
883 double double_v = (double) v;
884 return JVMFlagAccess::set_double(flag, &double_v, origin) == JVMFlag::SUCCESS;
885 } else {
886 return false;
887 }
888 }
889
890 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
891 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
892 // Contract: JVMFlag always returns a pointer that needs freeing.
893 FREE_C_HEAP_ARRAY(char, value);
894 return true;
895 }
896
897 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
898 const char* old_value = "";
899 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
900 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
901 size_t new_len = strlen(new_value);
902 const char* value;
903 char* free_this_too = NULL;
904 if (old_len == 0) {
905 value = new_value;
906 } else if (new_len == 0) {
907 value = old_value;
908 } else {
909 size_t length = old_len + 1 + new_len + 1;
910 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
911 // each new setting adds another LINE to the switch:
912 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
913 value = buf;
914 free_this_too = buf;
915 }
916 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
917 // JVMFlag always returns a pointer that needs freeing.
918 FREE_C_HEAP_ARRAY(char, value);
919 // JVMFlag made its own copy, so I must delete my own temp. buffer.
920 FREE_C_HEAP_ARRAY(char, free_this_too);
921 return true;
922 }
923
924 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
925 const char* real_name = real_flag_name(arg);
926 JDK_Version since = JDK_Version();
927 switch (is_deprecated_flag(arg, &since)) {
928 case -1: {
929 // Obsolete or expired, so don't process normally,
930 // but allow for an obsolete flag we're still
931 // temporarily allowing.
932 if (!is_obsolete_flag(arg, &since)) {
933 return real_name;
934 }
935 // Note if we're not considered obsolete then we can't be expired either
936 // as obsoletion must come first.
937 return NULL;
938 }
939 case 0:
940 return real_name;
941 case 1: {
942 if (warn) {
943 char version[256];
944 since.to_string(version, sizeof(version));
945 if (real_name != arg) {
946 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
947 arg, version, real_name);
948 } else {
949 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
950 arg, version);
951 }
952 }
953 return real_name;
954 }
955 }
956 ShouldNotReachHere();
957 return NULL;
958 }
959
960 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
961
962 // range of acceptable characters spelled out for portability reasons
963 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
964 #define BUFLEN 255
965 char name[BUFLEN+1];
966 char dummy;
967 const char* real_name;
968 bool warn_if_deprecated = true;
969
970 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
971 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
972 if (real_name == NULL) {
973 return false;
974 }
975 JVMFlag* flag = JVMFlag::find_flag(real_name);
976 return set_bool_flag(flag, false, origin);
977 }
978 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
979 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
980 if (real_name == NULL) {
981 return false;
982 }
983 JVMFlag* flag = JVMFlag::find_flag(real_name);
984 return set_bool_flag(flag, true, origin);
985 }
986
987 char punct;
988 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
989 const char* value = strchr(arg, '=') + 1;
990
991 // this scanf pattern matches both strings (handled here) and numbers (handled later))
992 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
993 if (real_name == NULL) {
994 return false;
995 }
996 JVMFlag* flag = JVMFlag::find_flag(real_name);
997 if (flag != NULL && flag->is_ccstr()) {
998 if (flag->ccstr_accumulates()) {
999 return append_to_string_flag(flag, value, origin);
1000 } else {
1001 if (value[0] == '\0') {
1002 value = NULL;
1003 }
1004 return set_string_flag(flag, value, origin);
1005 }
1006 } else {
1007 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1008 }
1009 }
1010
1011 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1012 const char* value = strchr(arg, '=') + 1;
1013 // -XX:Foo:=xxx will reset the string flag to the given value.
1014 if (value[0] == '\0') {
1015 value = NULL;
1016 }
1017 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1018 if (real_name == NULL) {
1019 return false;
1020 }
1021 JVMFlag* flag = JVMFlag::find_flag(real_name);
1022 return set_string_flag(flag, value, origin);
1023 }
1024
1025 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1026 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1027 #define NUMBER_RANGE "[0123456789eE+-]"
1028 char value[BUFLEN + 1];
1029 char value2[BUFLEN + 1];
1030 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1031 // Looks like a floating-point number -- try again with more lenient format string
1032 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1033 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1034 if (real_name == NULL) {
1035 return false;
1036 }
1037 JVMFlag* flag = JVMFlag::find_flag(real_name);
1038 return set_fp_numeric_flag(flag, value, origin);
1039 }
1040 }
1041
1042 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1043 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1044 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1045 if (real_name == NULL) {
1046 return false;
1047 }
1048 JVMFlag* flag = JVMFlag::find_flag(real_name);
1049 return set_numeric_flag(flag, value, origin);
1050 }
1051
1052 return false;
1053 }
1054
1055 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1056 assert(bldarray != NULL, "illegal argument");
1057
1058 if (arg == NULL) {
1059 return;
1060 }
1061
1062 int new_count = *count + 1;
1063
1064 // expand the array and add arg to the last element
1065 if (*bldarray == NULL) {
1066 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1067 } else {
1068 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1069 }
1070 (*bldarray)[*count] = os::strdup_check_oom(arg);
1071 *count = new_count;
1072 }
1073
1074 void Arguments::build_jvm_args(const char* arg) {
1075 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1076 }
1077
1078 void Arguments::build_jvm_flags(const char* arg) {
1079 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1080 }
1081
1082 // utility function to return a string that concatenates all
1083 // strings in a given char** array
1084 const char* Arguments::build_resource_string(char** args, int count) {
1085 if (args == NULL || count == 0) {
1086 return NULL;
1087 }
1088 size_t length = 0;
1089 for (int i = 0; i < count; i++) {
1090 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1091 }
1092 char* s = NEW_RESOURCE_ARRAY(char, length);
1093 char* dst = s;
1094 for (int j = 0; j < count; j++) {
1095 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1096 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1097 dst += offset;
1098 length -= offset;
1099 }
1100 return (const char*) s;
1101 }
1102
1103 void Arguments::print_on(outputStream* st) {
1104 st->print_cr("VM Arguments:");
1105 if (num_jvm_flags() > 0) {
1106 st->print("jvm_flags: "); print_jvm_flags_on(st);
1107 st->cr();
1108 }
1109 if (num_jvm_args() > 0) {
1110 st->print("jvm_args: "); print_jvm_args_on(st);
1111 st->cr();
1112 }
1113 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1114 if (_java_class_path != NULL) {
1115 char* path = _java_class_path->value();
1116 size_t len = strlen(path);
1117 st->print("java_class_path (initial): ");
1118 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1119 if (len == 0) {
1120 st->print_raw_cr("<not set>");
1121 } else {
1122 st->print_raw_cr(path, len);
1123 }
1124 }
1125 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1126 }
1127
1128 void Arguments::print_summary_on(outputStream* st) {
1129 // Print the command line. Environment variables that are helpful for
1130 // reproducing the problem are written later in the hs_err file.
1131 // flags are from setting file
1132 if (num_jvm_flags() > 0) {
1133 st->print_raw("Settings File: ");
1134 print_jvm_flags_on(st);
1135 st->cr();
1136 }
1137 // args are the command line and environment variable arguments.
1138 st->print_raw("Command Line: ");
1139 if (num_jvm_args() > 0) {
1140 print_jvm_args_on(st);
1141 }
1142 // this is the classfile and any arguments to the java program
1143 if (java_command() != NULL) {
1144 st->print("%s", java_command());
1145 }
1146 st->cr();
1147 }
1148
1149 void Arguments::print_jvm_flags_on(outputStream* st) {
1150 if (_num_jvm_flags > 0) {
1151 for (int i=0; i < _num_jvm_flags; i++) {
1152 st->print("%s ", _jvm_flags_array[i]);
1153 }
1154 }
1155 }
1156
1157 void Arguments::print_jvm_args_on(outputStream* st) {
1158 if (_num_jvm_args > 0) {
1159 for (int i=0; i < _num_jvm_args; i++) {
1160 st->print("%s ", _jvm_args_array[i]);
1161 }
1162 }
1163 }
1164
1165 bool Arguments::process_argument(const char* arg,
1166 jboolean ignore_unrecognized,
1167 JVMFlagOrigin origin) {
1168 JDK_Version since = JDK_Version();
1169
1170 if (parse_argument(arg, origin)) {
1171 return true;
1172 }
1173
1174 // Determine if the flag has '+', '-', or '=' characters.
1175 bool has_plus_minus = (*arg == '+' || *arg == '-');
1176 const char* const argname = has_plus_minus ? arg + 1 : arg;
1177
1178 size_t arg_len;
1179 const char* equal_sign = strchr(argname, '=');
1180 if (equal_sign == NULL) {
1181 arg_len = strlen(argname);
1182 } else {
1183 arg_len = equal_sign - argname;
1184 }
1185
1186 // Only make the obsolete check for valid arguments.
1187 if (arg_len <= BUFLEN) {
1188 // Construct a string which consists only of the argument name without '+', '-', or '='.
1189 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1190 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1191 if (is_obsolete_flag(stripped_argname, &since)) {
1192 char version[256];
1193 since.to_string(version, sizeof(version));
1194 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1195 return true;
1196 }
1197 }
1198
1199 // For locked flags, report a custom error message if available.
1200 // Otherwise, report the standard unrecognized VM option.
1201 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1202 if (found_flag != NULL) {
1203 char locked_message_buf[BUFLEN];
1204 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1205 if (strlen(locked_message_buf) == 0) {
1206 if (found_flag->is_bool() && !has_plus_minus) {
1207 jio_fprintf(defaultStream::error_stream(),
1208 "Missing +/- setting for VM option '%s'\n", argname);
1209 } else if (!found_flag->is_bool() && has_plus_minus) {
1210 jio_fprintf(defaultStream::error_stream(),
1211 "Unexpected +/- setting in VM option '%s'\n", argname);
1212 } else {
1213 jio_fprintf(defaultStream::error_stream(),
1214 "Improperly specified VM option '%s'\n", argname);
1215 }
1216 } else {
1217 #ifdef PRODUCT
1218 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1219 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1220 if (ignore_unrecognized && mismatched) {
1221 return true;
1222 }
1223 #endif
1224 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1225 }
1226 } else {
1227 if (ignore_unrecognized) {
1228 return true;
1229 }
1230 jio_fprintf(defaultStream::error_stream(),
1231 "Unrecognized VM option '%s'\n", argname);
1232 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1233 if (fuzzy_matched != NULL) {
1234 jio_fprintf(defaultStream::error_stream(),
1235 "Did you mean '%s%s%s'? ",
1236 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1237 fuzzy_matched->name(),
1238 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1239 }
1240 }
1241
1242 // allow for commandline "commenting out" options like -XX:#+Verbose
1243 return arg[0] == '#';
1244 }
1245
1246 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1247 FILE* stream = os::fopen(file_name, "rb");
1248 if (stream == NULL) {
1249 if (should_exist) {
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Could not open settings file %s\n", file_name);
1252 return false;
1253 } else {
1254 return true;
1255 }
1256 }
1257
1258 char token[1024];
1259 int pos = 0;
1260
1261 bool in_white_space = true;
1262 bool in_comment = false;
1263 bool in_quote = false;
1264 char quote_c = 0;
1265 bool result = true;
1266
1267 int c = getc(stream);
1268 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1269 if (in_white_space) {
1270 if (in_comment) {
1271 if (c == '\n') in_comment = false;
1272 } else {
1273 if (c == '#') in_comment = true;
1274 else if (!isspace(c)) {
1275 in_white_space = false;
1276 token[pos++] = c;
1277 }
1278 }
1279 } else {
1280 if (c == '\n' || (!in_quote && isspace(c))) {
1281 // token ends at newline, or at unquoted whitespace
1282 // this allows a way to include spaces in string-valued options
1283 token[pos] = '\0';
1284 logOption(token);
1285 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1286 build_jvm_flags(token);
1287 pos = 0;
1288 in_white_space = true;
1289 in_quote = false;
1290 } else if (!in_quote && (c == '\'' || c == '"')) {
1291 in_quote = true;
1292 quote_c = c;
1293 } else if (in_quote && (c == quote_c)) {
1294 in_quote = false;
1295 } else {
1296 token[pos++] = c;
1297 }
1298 }
1299 c = getc(stream);
1300 }
1301 if (pos > 0) {
1302 token[pos] = '\0';
1303 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1304 build_jvm_flags(token);
1305 }
1306 fclose(stream);
1307 return result;
1308 }
1309
1310 //=============================================================================================================
1311 // Parsing of properties (-D)
1312
1313 const char* Arguments::get_property(const char* key) {
1314 return PropertyList_get_value(system_properties(), key);
1315 }
1316
1317 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1318 const char* eq = strchr(prop, '=');
1319 const char* key;
1320 const char* value = "";
1321
1322 if (eq == NULL) {
1323 // property doesn't have a value, thus use passed string
1324 key = prop;
1325 } else {
1326 // property have a value, thus extract it and save to the
1327 // allocated string
1328 size_t key_len = eq - prop;
1329 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1330
1331 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1332 key = tmp_key;
1333
1334 value = &prop[key_len + 1];
1335 }
1336
1337 #if INCLUDE_CDS
1338 if (is_internal_module_property(key) ||
1339 strcmp(key, "jdk.module.main") == 0) {
1340 MetaspaceShared::disable_optimized_module_handling();
1341 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1342 }
1343 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1344 strcmp(key, "jdk.module.validation") == 0 ||
1345 strcmp(key, "java.system.class.loader") == 0) {
1346 MetaspaceShared::disable_full_module_graph();
1347 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1348 }
1349 #endif
1350
1351 if (strcmp(key, "java.compiler") == 0) {
1352 process_java_compiler_argument(value);
1353 // Record value in Arguments, but let it get passed to Java.
1354 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1355 // sun.java.launcher.is_altjvm property is
1356 // private and is processed in process_sun_java_launcher_properties();
1357 // the sun.java.launcher property is passed on to the java application
1358 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1359 // append is true, writable is true, internal is false
1360 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1361 WriteableProperty, ExternalProperty);
1362 } else {
1363 if (strcmp(key, "sun.java.command") == 0) {
1364 char *old_java_command = _java_command;
1365 _java_command = os::strdup_check_oom(value, mtArguments);
1366 if (old_java_command != NULL) {
1367 os::free(old_java_command);
1368 }
1369 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1370 // If this property is set on the command line then its value will be
1371 // displayed in VM error logs as the URL at which to submit such logs.
1372 // Normally the URL displayed in error logs is different from the value
1373 // of this system property, so a different property should have been
1374 // used here, but we leave this as-is in case someone depends upon it.
1375 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1376 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1377 // its value without going through the property list or making a Java call.
1378 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1379 if (old_java_vendor_url_bug != NULL) {
1380 os::free((void *)old_java_vendor_url_bug);
1381 }
1382 }
1383
1384 // Create new property and add at the end of the list
1385 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1386 }
1387
1388 if (key != prop) {
1389 // SystemProperty copy passed value, thus free previously allocated
1390 // memory
1391 FreeHeap((void *)key);
1392 }
1393
1394 return true;
1395 }
1396
1397 #if INCLUDE_CDS
1398 const char* unsupported_properties[] = { "jdk.module.limitmods",
1399 "jdk.module.upgrade.path",
1400 "jdk.module.patch.0" };
1401 const char* unsupported_options[] = { "--limit-modules",
1402 "--upgrade-module-path",
1403 "--patch-module"
1404 };
1405 void Arguments::check_unsupported_dumping_properties() {
1406 assert(is_dumping_archive(),
1407 "this function is only used with CDS dump time");
1408 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1409 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1410 SystemProperty* sp = system_properties();
1411 while (sp != NULL) {
1412 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1413 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1414 vm_exit_during_initialization(
1415 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1416 }
1417 }
1418 sp = sp->next();
1419 }
1420
1421 // Check for an exploded module build in use with -Xshare:dump.
1422 if (!has_jimage()) {
1423 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1424 }
1425 }
1426
1427 bool Arguments::check_unsupported_cds_runtime_properties() {
1428 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1429 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1430 if (ArchiveClassesAtExit != NULL) {
1431 // dynamic dumping, just return false for now.
1432 // check_unsupported_dumping_properties() will be called later to check the same set of
1433 // properties, and will exit the VM with the correct error message if the unsupported properties
1434 // are used.
1435 return false;
1436 }
1437 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1438 if (get_property(unsupported_properties[i]) != NULL) {
1439 if (RequireSharedSpaces) {
1440 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1441 } else {
1442 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1443 }
1444 return true;
1445 }
1446 }
1447 return false;
1448 }
1449 #endif
1450
1451 //===========================================================================================================
1452 // Setting int/mixed/comp mode flags
1453
1454 void Arguments::set_mode_flags(Mode mode) {
1455 // Set up default values for all flags.
1456 // If you add a flag to any of the branches below,
1457 // add a default value for it here.
1458 set_java_compiler(false);
1459 _mode = mode;
1460
1461 // Ensure Agent_OnLoad has the correct initial values.
1462 // This may not be the final mode; mode may change later in onload phase.
1463 PropertyList_unique_add(&_system_properties, "java.vm.info",
1464 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1465
1466 UseInterpreter = true;
1467 UseCompiler = true;
1468 UseLoopCounter = true;
1469
1470 // Default values may be platform/compiler dependent -
1471 // use the saved values
1472 ClipInlining = Arguments::_ClipInlining;
1473 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1474 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1475 BackgroundCompilation = Arguments::_BackgroundCompilation;
1476
1477 // Change from defaults based on mode
1478 switch (mode) {
1479 default:
1480 ShouldNotReachHere();
1481 break;
1482 case _int:
1483 UseCompiler = false;
1484 UseLoopCounter = false;
1485 AlwaysCompileLoopMethods = false;
1486 UseOnStackReplacement = false;
1487 break;
1488 case _mixed:
1489 // same as default
1490 break;
1491 case _comp:
1492 UseInterpreter = false;
1493 BackgroundCompilation = false;
1494 ClipInlining = false;
1495 break;
1496 }
1497 }
1498
1499 // Conflict: required to use shared spaces (-Xshare:on), but
1500 // incompatible command line options were chosen.
1501 static void no_shared_spaces(const char* message) {
1502 if (RequireSharedSpaces) {
1503 jio_fprintf(defaultStream::error_stream(),
1504 "Class data sharing is inconsistent with other specified options.\n");
1505 vm_exit_during_initialization("Unable to use shared archive", message);
1506 } else {
1507 log_info(cds)("Unable to use shared archive: %s", message);
1508 UseSharedSpaces = false;
1509 }
1510 }
1511
1512 void set_object_alignment() {
1513 // Object alignment.
1514 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1515 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1516 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1517 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1518 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1519 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1520
1521 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1522 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1523
1524 // Oop encoding heap max
1525 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1526 }
1527
1528 size_t Arguments::max_heap_for_compressed_oops() {
1529 // Avoid sign flip.
1530 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1531 // We need to fit both the NULL page and the heap into the memory budget, while
1532 // keeping alignment constraints of the heap. To guarantee the latter, as the
1533 // NULL page is located before the heap, we pad the NULL page to the conservative
1534 // maximum alignment that the GC may ever impose upon the heap.
1535 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1536 _conservative_max_heap_alignment);
1537
1538 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1539 NOT_LP64(ShouldNotReachHere(); return 0);
1540 }
1541
1542 void Arguments::set_use_compressed_oops() {
1543 #ifdef _LP64
1544 // MaxHeapSize is not set up properly at this point, but
1545 // the only value that can override MaxHeapSize if we are
1546 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1547 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1548
1549 if (max_heap_size <= max_heap_for_compressed_oops()) {
1550 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1551 FLAG_SET_ERGO(UseCompressedOops, true);
1552 }
1553 } else {
1554 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1555 warning("Max heap size too large for Compressed Oops");
1556 FLAG_SET_DEFAULT(UseCompressedOops, false);
1557 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1558 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1559 }
1560 }
1561 }
1562 #endif // _LP64
1563 }
1564
1565
1566 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1567 // set_use_compressed_oops().
1568 void Arguments::set_use_compressed_klass_ptrs() {
1569 #ifdef _LP64
1570 // On some architectures, the use of UseCompressedClassPointers implies the use of
1571 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1572 // is reused to perform some optimized spilling, in order to use rheap_base as a
1573 // temp register. But by treating it as any other temp register, spilling can typically
1574 // be completely avoided instead. So it is better not to perform this trick. And by
1575 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1576 // can still use compressed class pointers.
1577 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1578 if (UseCompressedClassPointers) {
1579 warning("UseCompressedClassPointers requires UseCompressedOops");
1580 }
1581 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1582 } else {
1583 // Turn on UseCompressedClassPointers too
1584 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1585 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1586 }
1587 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1588 if (UseCompressedClassPointers) {
1589 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1590 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1591 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1592 }
1593 }
1594 }
1595 #endif // _LP64
1596 }
1597
1598 void Arguments::set_conservative_max_heap_alignment() {
1599 // The conservative maximum required alignment for the heap is the maximum of
1600 // the alignments imposed by several sources: any requirements from the heap
1601 // itself and the maximum page size we may run the VM with.
1602 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1603 _conservative_max_heap_alignment = MAX4(heap_alignment,
1604 (size_t)os::vm_allocation_granularity(),
1605 os::max_page_size(),
1606 GCArguments::compute_heap_alignment());
1607 }
1608
1609 jint Arguments::set_ergonomics_flags() {
1610 GCConfig::initialize();
1611
1612 set_conservative_max_heap_alignment();
1613
1614 #ifdef _LP64
1615 set_use_compressed_oops();
1616
1617 // set_use_compressed_klass_ptrs() must be called after calling
1618 // set_use_compressed_oops().
1619 set_use_compressed_klass_ptrs();
1620
1621 // Also checks that certain machines are slower with compressed oops
1622 // in vm_version initialization code.
1623 #endif // _LP64
1624
1625 return JNI_OK;
1626 }
1627
1628 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1629 size_t max_allocatable;
1630 size_t result = limit;
1631 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1632 // The AggressiveHeap check is a temporary workaround to avoid calling
1633 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1634 // selected. This works because AggressiveHeap implies UseParallelGC
1635 // where we know the ratio will be 1. Once the AggressiveHeap option is
1636 // removed, this can be cleaned up.
1637 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1638 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1639 result = MIN2(result, max_allocatable / fraction);
1640 }
1641 return result;
1642 }
1643
1644 // Use static initialization to get the default before parsing
1645 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1646
1647 void Arguments::set_heap_size() {
1648 julong phys_mem;
1649
1650 // If the user specified one of these options, they
1651 // want specific memory sizing so do not limit memory
1652 // based on compressed oops addressability.
1653 // Also, memory limits will be calculated based on
1654 // available os physical memory, not our MaxRAM limit,
1655 // unless MaxRAM is also specified.
1656 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1657 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1658 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1659 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1660 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1661 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1662 !FLAG_IS_DEFAULT(MaxRAM));
1663 if (override_coop_limit) {
1664 if (FLAG_IS_DEFAULT(MaxRAM)) {
1665 phys_mem = os::physical_memory();
1666 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1667 } else {
1668 phys_mem = (julong)MaxRAM;
1669 }
1670 } else {
1671 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1672 : (julong)MaxRAM;
1673 }
1674
1675
1676 // Convert deprecated flags
1677 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1678 !FLAG_IS_DEFAULT(MaxRAMFraction))
1679 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1680
1681 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1682 !FLAG_IS_DEFAULT(MinRAMFraction))
1683 MinRAMPercentage = 100.0 / MinRAMFraction;
1684
1685 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1686 !FLAG_IS_DEFAULT(InitialRAMFraction))
1687 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1688
1689 // If the maximum heap size has not been set with -Xmx,
1690 // then set it as fraction of the size of physical memory,
1691 // respecting the maximum and minimum sizes of the heap.
1692 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1693 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1694 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1695 if (reasonable_min < MaxHeapSize) {
1696 // Small physical memory, so use a minimum fraction of it for the heap
1697 reasonable_max = reasonable_min;
1698 } else {
1699 // Not-small physical memory, so require a heap at least
1700 // as large as MaxHeapSize
1701 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1702 }
1703
1704 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1705 // Limit the heap size to ErgoHeapSizeLimit
1706 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1707 }
1708
1709 #ifdef _LP64
1710 if (UseCompressedOops || UseCompressedClassPointers) {
1711 // HeapBaseMinAddress can be greater than default but not less than.
1712 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1713 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1714 // matches compressed oops printing flags
1715 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1716 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1717 DefaultHeapBaseMinAddress,
1718 DefaultHeapBaseMinAddress/G,
1719 HeapBaseMinAddress);
1720 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1721 }
1722 }
1723 }
1724 if (UseCompressedOops) {
1725 // Limit the heap size to the maximum possible when using compressed oops
1726 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1727
1728 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1729 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1730 // but it should be not less than default MaxHeapSize.
1731 max_coop_heap -= HeapBaseMinAddress;
1732 }
1733
1734 // If user specified flags prioritizing os physical
1735 // memory limits, then disable compressed oops if
1736 // limits exceed max_coop_heap and UseCompressedOops
1737 // was not specified.
1738 if (reasonable_max > max_coop_heap) {
1739 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1740 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1741 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1742 "Please check the setting of MaxRAMPercentage %5.2f."
1743 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1744 FLAG_SET_ERGO(UseCompressedOops, false);
1745 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1746 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1747 }
1748 } else {
1749 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1750 }
1751 }
1752 }
1753 #endif // _LP64
1754
1755 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1756
1757 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1758 // An initial heap size was specified on the command line,
1759 // so be sure that the maximum size is consistent. Done
1760 // after call to limit_heap_by_allocatable_memory because that
1761 // method might reduce the allocation size.
1762 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1763 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1764 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1765 }
1766
1767 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1768 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1769 }
1770
1771 // If the minimum or initial heap_size have not been set or requested to be set
1772 // ergonomically, set them accordingly.
1773 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1774 julong reasonable_minimum = (julong)(OldSize + NewSize);
1775
1776 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1777
1778 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1779
1780 if (InitialHeapSize == 0) {
1781 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1782 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1783
1784 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1785 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1786
1787 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1788 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1789 }
1790 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1791 // synchronize with InitialHeapSize to avoid errors with the default value.
1792 if (MinHeapSize == 0) {
1793 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1794 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1795 }
1796 }
1797 }
1798
1799 // This option inspects the machine and attempts to set various
1800 // parameters to be optimal for long-running, memory allocation
1801 // intensive jobs. It is intended for machines with large
1802 // amounts of cpu and memory.
1803 jint Arguments::set_aggressive_heap_flags() {
1804 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1805 // VM, but we may not be able to represent the total physical memory
1806 // available (like having 8gb of memory on a box but using a 32bit VM).
1807 // Thus, we need to make sure we're using a julong for intermediate
1808 // calculations.
1809 julong initHeapSize;
1810 julong total_memory = os::physical_memory();
1811
1812 if (total_memory < (julong) 256 * M) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1815 vm_exit(1);
1816 }
1817
1818 // The heap size is half of available memory, or (at most)
1819 // all of possible memory less 160mb (leaving room for the OS
1820 // when using ISM). This is the maximum; because adaptive sizing
1821 // is turned on below, the actual space used may be smaller.
1822
1823 initHeapSize = MIN2(total_memory / (julong) 2,
1824 total_memory - (julong) 160 * M);
1825
1826 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1827
1828 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1829 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1830 return JNI_EINVAL;
1831 }
1832 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1833 return JNI_EINVAL;
1834 }
1835 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1836 return JNI_EINVAL;
1837 }
1838 }
1839 if (FLAG_IS_DEFAULT(NewSize)) {
1840 // Make the young generation 3/8ths of the total heap.
1841 if (FLAG_SET_CMDLINE(NewSize,
1842 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1843 return JNI_EINVAL;
1844 }
1845 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1846 return JNI_EINVAL;
1847 }
1848 }
1849
1850 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1851 FLAG_SET_DEFAULT(UseLargePages, true);
1852 #endif
1853
1854 // Increase some data structure sizes for efficiency
1855 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1856 return JNI_EINVAL;
1857 }
1858 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1859 return JNI_EINVAL;
1860 }
1861 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1862 return JNI_EINVAL;
1863 }
1864
1865 // See the OldPLABSize comment below, but replace 'after promotion'
1866 // with 'after copying'. YoungPLABSize is the size of the survivor
1867 // space per-gc-thread buffers. The default is 4kw.
1868 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1869 return JNI_EINVAL;
1870 }
1871
1872 // OldPLABSize is the size of the buffers in the old gen that
1873 // UseParallelGC uses to promote live data that doesn't fit in the
1874 // survivor spaces. At any given time, there's one for each gc thread.
1875 // The default size is 1kw. These buffers are rarely used, since the
1876 // survivor spaces are usually big enough. For specjbb, however, there
1877 // are occasions when there's lots of live data in the young gen
1878 // and we end up promoting some of it. We don't have a definite
1879 // explanation for why bumping OldPLABSize helps, but the theory
1880 // is that a bigger PLAB results in retaining something like the
1881 // original allocation order after promotion, which improves mutator
1882 // locality. A minor effect may be that larger PLABs reduce the
1883 // number of PLAB allocation events during gc. The value of 8kw
1884 // was arrived at by experimenting with specjbb.
1885 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1886 return JNI_EINVAL;
1887 }
1888
1889 // Enable parallel GC and adaptive generation sizing
1890 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1891 return JNI_EINVAL;
1892 }
1893
1894 // Encourage steady state memory management
1895 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898
1899 // This appears to improve mutator locality
1900 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903
1904 return JNI_OK;
1905 }
1906
1907 // This must be called after ergonomics.
1908 void Arguments::set_bytecode_flags() {
1909 if (!RewriteBytecodes) {
1910 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1911 }
1912 }
1913
1914 // Aggressive optimization flags
1915 jint Arguments::set_aggressive_opts_flags() {
1916 #ifdef COMPILER2
1917 if (AggressiveUnboxing) {
1918 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1919 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1920 } else if (!EliminateAutoBox) {
1921 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1922 AggressiveUnboxing = false;
1923 }
1924 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1925 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1926 } else if (!DoEscapeAnalysis) {
1927 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1928 AggressiveUnboxing = false;
1929 }
1930 }
1931 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1932 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1933 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1934 }
1935 // Feed the cache size setting into the JDK
1936 char buffer[1024];
1937 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1938 if (!add_property(buffer)) {
1939 return JNI_ENOMEM;
1940 }
1941 }
1942 #endif
1943
1944 return JNI_OK;
1945 }
1946
1947 //===========================================================================================================
1948 // Parsing of java.compiler property
1949
1950 void Arguments::process_java_compiler_argument(const char* arg) {
1951 // For backwards compatibility, Djava.compiler=NONE or ""
1952 // causes us to switch to -Xint mode UNLESS -Xdebug
1953 // is also specified.
1954 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1955 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1956 }
1957 }
1958
1959 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1960 _sun_java_launcher = os::strdup_check_oom(launcher);
1961 }
1962
1963 bool Arguments::created_by_java_launcher() {
1964 assert(_sun_java_launcher != NULL, "property must have value");
1965 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1966 }
1967
1968 bool Arguments::sun_java_launcher_is_altjvm() {
1969 return _sun_java_launcher_is_altjvm;
1970 }
1971
1972 //===========================================================================================================
1973 // Parsing of main arguments
1974
1975 unsigned int addreads_count = 0;
1976 unsigned int addexports_count = 0;
1977 unsigned int addopens_count = 0;
1978 unsigned int addmods_count = 0;
1979 unsigned int patch_mod_count = 0;
1980 unsigned int enable_native_access_count = 0;
1981
1982 // Check the consistency of vm_init_args
1983 bool Arguments::check_vm_args_consistency() {
1984 // Method for adding checks for flag consistency.
1985 // The intent is to warn the user of all possible conflicts,
1986 // before returning an error.
1987 // Note: Needs platform-dependent factoring.
1988 bool status = true;
1989
1990 if (TLABRefillWasteFraction == 0) {
1991 jio_fprintf(defaultStream::error_stream(),
1992 "TLABRefillWasteFraction should be a denominator, "
1993 "not " SIZE_FORMAT "\n",
1994 TLABRefillWasteFraction);
1995 status = false;
1996 }
1997
1998 status = CompilerConfig::check_args_consistency(status);
1999 #if INCLUDE_JVMCI
2000 if (status && EnableJVMCI) {
2001 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2002 AddProperty, UnwriteableProperty, InternalProperty);
2003 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2004 return false;
2005 }
2006 }
2007 #endif
2008
2009 #ifndef SUPPORT_RESERVED_STACK_AREA
2010 if (StackReservedPages != 0) {
2011 FLAG_SET_CMDLINE(StackReservedPages, 0);
2012 warning("Reserved Stack Area not supported on this platform");
2013 }
2014 #endif
2015
2016 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64)
2017 if (UseHeavyMonitors) {
2018 warning("UseHeavyMonitors is not fully implemented on this architecture");
2019 }
2020 #endif
2021 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
2022 if (UseHeavyMonitors && UseRTMForStackLocks) {
2023 fatal("-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive");
2024 }
2025 #endif
2026 if (VerifyHeavyMonitors && !UseHeavyMonitors) {
2027 fatal("-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors");
2028 }
2029
2030 return status;
2031 }
2032
2033 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2034 const char* option_type) {
2035 if (ignore) return false;
2036
2037 const char* spacer = " ";
2038 if (option_type == NULL) {
2039 option_type = ++spacer; // Set both to the empty string.
2040 }
2041
2042 jio_fprintf(defaultStream::error_stream(),
2043 "Unrecognized %s%soption: %s\n", option_type, spacer,
2044 option->optionString);
2045 return true;
2046 }
2047
2048 static const char* user_assertion_options[] = {
2049 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2050 };
2051
2052 static const char* system_assertion_options[] = {
2053 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2054 };
2055
2056 bool Arguments::parse_uintx(const char* value,
2057 uintx* uintx_arg,
2058 uintx min_size) {
2059
2060 // Check the sign first since atojulong() parses only unsigned values.
2061 bool value_is_positive = !(*value == '-');
2062
2063 if (value_is_positive) {
2064 julong n;
2065 bool good_return = atojulong(value, &n);
2066 if (good_return) {
2067 bool above_minimum = n >= min_size;
2068 bool value_is_too_large = n > max_uintx;
2069
2070 if (above_minimum && !value_is_too_large) {
2071 *uintx_arg = n;
2072 return true;
2073 }
2074 }
2075 }
2076 return false;
2077 }
2078
2079 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2080 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2081 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2082 char* property = AllocateHeap(prop_len, mtArguments);
2083 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2084 if (ret < 0 || ret >= (int)prop_len) {
2085 FreeHeap(property);
2086 return false;
2087 }
2088 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2089 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2090 // that multiple occurrences of the associated flag just causes the existing property value to be
2091 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2092 // to a property after we have finished flag processing.
2093 bool added = add_property(property, WriteableProperty, internal);
2094 FreeHeap(property);
2095 return added;
2096 }
2097
2098 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2099 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2100 const unsigned int props_count_limit = 1000;
2101 const int max_digits = 3;
2102 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2103
2104 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2105 if (count < props_count_limit) {
2106 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2107 char* property = AllocateHeap(prop_len, mtArguments);
2108 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2109 if (ret < 0 || ret >= (int)prop_len) {
2110 FreeHeap(property);
2111 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2112 return false;
2113 }
2114 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2115 FreeHeap(property);
2116 return added;
2117 }
2118
2119 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2120 return false;
2121 }
2122
2123 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2124 julong* long_arg,
2125 julong min_size,
2126 julong max_size) {
2127 if (!atojulong(s, long_arg)) return arg_unreadable;
2128 return check_memory_size(*long_arg, min_size, max_size);
2129 }
2130
2131 // Parse JavaVMInitArgs structure
2132
2133 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2134 const JavaVMInitArgs *java_tool_options_args,
2135 const JavaVMInitArgs *java_options_args,
2136 const JavaVMInitArgs *cmd_line_args) {
2137 bool patch_mod_javabase = false;
2138
2139 // Save default settings for some mode flags
2140 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2141 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2142 Arguments::_ClipInlining = ClipInlining;
2143 Arguments::_BackgroundCompilation = BackgroundCompilation;
2144
2145 // Remember the default value of SharedBaseAddress.
2146 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2147
2148 // Setup flags for mixed which is the default
2149 set_mode_flags(_mixed);
2150
2151 // Parse args structure generated from java.base vm options resource
2152 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2153 if (result != JNI_OK) {
2154 return result;
2155 }
2156
2157 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2158 // variable (if present).
2159 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2160 if (result != JNI_OK) {
2161 return result;
2162 }
2163
2164 // Parse args structure generated from the command line flags.
2165 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2166 if (result != JNI_OK) {
2167 return result;
2168 }
2169
2170 // Parse args structure generated from the _JAVA_OPTIONS environment
2171 // variable (if present) (mimics classic VM)
2172 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2173 if (result != JNI_OK) {
2174 return result;
2175 }
2176
2177 // We need to ensure processor and memory resources have been properly
2178 // configured - which may rely on arguments we just processed - before
2179 // doing the final argument processing. Any argument processing that
2180 // needs to know about processor and memory resources must occur after
2181 // this point.
2182
2183 os::init_container_support();
2184
2185 // Do final processing now that all arguments have been parsed
2186 result = finalize_vm_init_args(patch_mod_javabase);
2187 if (result != JNI_OK) {
2188 return result;
2189 }
2190
2191 return JNI_OK;
2192 }
2193
2194 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2195 // represents a valid JDWP agent. is_path==true denotes that we
2196 // are dealing with -agentpath (case where name is a path), otherwise with
2197 // -agentlib
2198 bool valid_jdwp_agent(char *name, bool is_path) {
2199 char *_name;
2200 const char *_jdwp = "jdwp";
2201 size_t _len_jdwp, _len_prefix;
2202
2203 if (is_path) {
2204 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2205 return false;
2206 }
2207
2208 _name++; // skip past last path separator
2209 _len_prefix = strlen(JNI_LIB_PREFIX);
2210
2211 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2212 return false;
2213 }
2214
2215 _name += _len_prefix;
2216 _len_jdwp = strlen(_jdwp);
2217
2218 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2219 _name += _len_jdwp;
2220 }
2221 else {
2222 return false;
2223 }
2224
2225 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2226 return false;
2227 }
2228
2229 return true;
2230 }
2231
2232 if (strcmp(name, _jdwp) == 0) {
2233 return true;
2234 }
2235
2236 return false;
2237 }
2238
2239 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2240 // --patch-module=<module>=<file>(<pathsep><file>)*
2241 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2242 // Find the equal sign between the module name and the path specification
2243 const char* module_equal = strchr(patch_mod_tail, '=');
2244 if (module_equal == NULL) {
2245 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2246 return JNI_ERR;
2247 } else {
2248 // Pick out the module name
2249 size_t module_len = module_equal - patch_mod_tail;
2250 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2251 if (module_name != NULL) {
2252 memcpy(module_name, patch_mod_tail, module_len);
2253 *(module_name + module_len) = '\0';
2254 // The path piece begins one past the module_equal sign
2255 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2256 FREE_C_HEAP_ARRAY(char, module_name);
2257 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2258 return JNI_ENOMEM;
2259 }
2260 } else {
2261 return JNI_ENOMEM;
2262 }
2263 }
2264 return JNI_OK;
2265 }
2266
2267 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2268 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2269 // The min and max sizes match the values in globals.hpp, but scaled
2270 // with K. The values have been chosen so that alignment with page
2271 // size doesn't change the max value, which makes the conversions
2272 // back and forth between Xss value and ThreadStackSize value easier.
2273 // The values have also been chosen to fit inside a 32-bit signed type.
2274 const julong min_ThreadStackSize = 0;
2275 const julong max_ThreadStackSize = 1 * M;
2276
2277 // Make sure the above values match the range set in globals.hpp
2278 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2279 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2280 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2281
2282 const julong min_size = min_ThreadStackSize * K;
2283 const julong max_size = max_ThreadStackSize * K;
2284
2285 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2286
2287 julong size = 0;
2288 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2289 if (errcode != arg_in_range) {
2290 bool silent = (option == NULL); // Allow testing to silence error messages
2291 if (!silent) {
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Invalid thread stack size: %s\n", option->optionString);
2294 describe_range_error(errcode);
2295 }
2296 return JNI_EINVAL;
2297 }
2298
2299 // Internally track ThreadStackSize in units of 1024 bytes.
2300 const julong size_aligned = align_up(size, K);
2301 assert(size <= size_aligned,
2302 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2303 size, size_aligned);
2304
2305 const julong size_in_K = size_aligned / K;
2306 assert(size_in_K < (julong)max_intx,
2307 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2308 size_in_K);
2309
2310 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2311 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2312 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2313 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2314 max_expanded, size_in_K);
2315
2316 *out_ThreadStackSize = (intx)size_in_K;
2317
2318 return JNI_OK;
2319 }
2320
2321 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2322 // For match_option to return remaining or value part of option string
2323 const char* tail;
2324
2325 // iterate over arguments
2326 for (int index = 0; index < args->nOptions; index++) {
2327 bool is_absolute_path = false; // for -agentpath vs -agentlib
2328
2329 const JavaVMOption* option = args->options + index;
2330
2331 if (!match_option(option, "-Djava.class.path", &tail) &&
2332 !match_option(option, "-Dsun.java.command", &tail) &&
2333 !match_option(option, "-Dsun.java.launcher", &tail)) {
2334
2335 // add all jvm options to the jvm_args string. This string
2336 // is used later to set the java.vm.args PerfData string constant.
2337 // the -Djava.class.path and the -Dsun.java.command options are
2338 // omitted from jvm_args string as each have their own PerfData
2339 // string constant object.
2340 build_jvm_args(option->optionString);
2341 }
2342
2343 // -verbose:[class/module/gc/jni]
2344 if (match_option(option, "-verbose", &tail)) {
2345 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2346 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2347 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2348 } else if (!strcmp(tail, ":module")) {
2349 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2350 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2351 } else if (!strcmp(tail, ":gc")) {
2352 if (_legacyGCLogging.lastFlag == 0) {
2353 _legacyGCLogging.lastFlag = 1;
2354 }
2355 } else if (!strcmp(tail, ":jni")) {
2356 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2357 }
2358 // -da / -ea / -disableassertions / -enableassertions
2359 // These accept an optional class/package name separated by a colon, e.g.,
2360 // -da:java.lang.Thread.
2361 } else if (match_option(option, user_assertion_options, &tail, true)) {
2362 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2363 if (*tail == '\0') {
2364 JavaAssertions::setUserClassDefault(enable);
2365 } else {
2366 assert(*tail == ':', "bogus match by match_option()");
2367 JavaAssertions::addOption(tail + 1, enable);
2368 }
2369 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2370 } else if (match_option(option, system_assertion_options, &tail, false)) {
2371 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2372 JavaAssertions::setSystemClassDefault(enable);
2373 // -bootclasspath:
2374 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2375 jio_fprintf(defaultStream::output_stream(),
2376 "-Xbootclasspath is no longer a supported option.\n");
2377 return JNI_EINVAL;
2378 // -bootclasspath/a:
2379 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2380 Arguments::append_sysclasspath(tail);
2381 #if INCLUDE_CDS
2382 MetaspaceShared::disable_optimized_module_handling();
2383 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2384 #endif
2385 // -bootclasspath/p:
2386 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2387 jio_fprintf(defaultStream::output_stream(),
2388 "-Xbootclasspath/p is no longer a supported option.\n");
2389 return JNI_EINVAL;
2390 // -Xrun
2391 } else if (match_option(option, "-Xrun", &tail)) {
2392 if (tail != NULL) {
2393 const char* pos = strchr(tail, ':');
2394 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2395 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2396 jio_snprintf(name, len + 1, "%s", tail);
2397
2398 char *options = NULL;
2399 if(pos != NULL) {
2400 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2401 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2402 }
2403 #if !INCLUDE_JVMTI
2404 if (strcmp(name, "jdwp") == 0) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "Debugging agents are not supported in this VM\n");
2407 return JNI_ERR;
2408 }
2409 #endif // !INCLUDE_JVMTI
2410 add_init_library(name, options);
2411 }
2412 } else if (match_option(option, "--add-reads=", &tail)) {
2413 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2414 return JNI_ENOMEM;
2415 }
2416 } else if (match_option(option, "--add-exports=", &tail)) {
2417 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2418 return JNI_ENOMEM;
2419 }
2420 } else if (match_option(option, "--add-opens=", &tail)) {
2421 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2422 return JNI_ENOMEM;
2423 }
2424 } else if (match_option(option, "--add-modules=", &tail)) {
2425 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2426 return JNI_ENOMEM;
2427 }
2428 } else if (match_option(option, "--enable-native-access=", &tail)) {
2429 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2430 return JNI_ENOMEM;
2431 }
2432 } else if (match_option(option, "--limit-modules=", &tail)) {
2433 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2434 return JNI_ENOMEM;
2435 }
2436 } else if (match_option(option, "--module-path=", &tail)) {
2437 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2438 return JNI_ENOMEM;
2439 }
2440 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2441 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2442 return JNI_ENOMEM;
2443 }
2444 } else if (match_option(option, "--patch-module=", &tail)) {
2445 // --patch-module=<module>=<file>(<pathsep><file>)*
2446 int res = process_patch_mod_option(tail, patch_mod_javabase);
2447 if (res != JNI_OK) {
2448 return res;
2449 }
2450 } else if (match_option(option, "--illegal-access=", &tail)) {
2451 char version[256];
2452 JDK_Version::jdk(17).to_string(version, sizeof(version));
2453 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2454 // -agentlib and -agentpath
2455 } else if (match_option(option, "-agentlib:", &tail) ||
2456 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2457 if(tail != NULL) {
2458 const char* pos = strchr(tail, '=');
2459 char* name;
2460 if (pos == NULL) {
2461 name = os::strdup_check_oom(tail, mtArguments);
2462 } else {
2463 size_t len = pos - tail;
2464 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2465 memcpy(name, tail, len);
2466 name[len] = '\0';
2467 }
2468
2469 char *options = NULL;
2470 if(pos != NULL) {
2471 options = os::strdup_check_oom(pos + 1, mtArguments);
2472 }
2473 #if !INCLUDE_JVMTI
2474 if (valid_jdwp_agent(name, is_absolute_path)) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Debugging agents are not supported in this VM\n");
2477 return JNI_ERR;
2478 }
2479 #endif // !INCLUDE_JVMTI
2480 add_init_agent(name, options, is_absolute_path);
2481 }
2482 // -javaagent
2483 } else if (match_option(option, "-javaagent:", &tail)) {
2484 #if !INCLUDE_JVMTI
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Instrumentation agents are not supported in this VM\n");
2487 return JNI_ERR;
2488 #else
2489 if (tail != NULL) {
2490 size_t length = strlen(tail) + 1;
2491 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2492 jio_snprintf(options, length, "%s", tail);
2493 add_instrument_agent("instrument", options, false);
2494 // java agents need module java.instrument
2495 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2496 return JNI_ENOMEM;
2497 }
2498 }
2499 #endif // !INCLUDE_JVMTI
2500 // --enable_preview
2501 } else if (match_option(option, "--enable-preview")) {
2502 set_enable_preview();
2503 // -Xnoclassgc
2504 } else if (match_option(option, "-Xnoclassgc")) {
2505 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2506 return JNI_EINVAL;
2507 }
2508 // -Xbatch
2509 } else if (match_option(option, "-Xbatch")) {
2510 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2511 return JNI_EINVAL;
2512 }
2513 // -Xmn for compatibility with other JVM vendors
2514 } else if (match_option(option, "-Xmn", &tail)) {
2515 julong long_initial_young_size = 0;
2516 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2517 if (errcode != arg_in_range) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Invalid initial young generation size: %s\n", option->optionString);
2520 describe_range_error(errcode);
2521 return JNI_EINVAL;
2522 }
2523 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2524 return JNI_EINVAL;
2525 }
2526 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2527 return JNI_EINVAL;
2528 }
2529 // -Xms
2530 } else if (match_option(option, "-Xms", &tail)) {
2531 julong size = 0;
2532 // an initial heap size of 0 means automatically determine
2533 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2534 if (errcode != arg_in_range) {
2535 jio_fprintf(defaultStream::error_stream(),
2536 "Invalid initial heap size: %s\n", option->optionString);
2537 describe_range_error(errcode);
2538 return JNI_EINVAL;
2539 }
2540 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2544 return JNI_EINVAL;
2545 }
2546 // -Xmx
2547 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2548 julong long_max_heap_size = 0;
2549 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2550 if (errcode != arg_in_range) {
2551 jio_fprintf(defaultStream::error_stream(),
2552 "Invalid maximum heap size: %s\n", option->optionString);
2553 describe_range_error(errcode);
2554 return JNI_EINVAL;
2555 }
2556 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2557 return JNI_EINVAL;
2558 }
2559 // Xmaxf
2560 } else if (match_option(option, "-Xmaxf", &tail)) {
2561 char* err;
2562 int maxf = (int)(strtod(tail, &err) * 100);
2563 if (*err != '\0' || *tail == '\0') {
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Bad max heap free percentage size: %s\n",
2566 option->optionString);
2567 return JNI_EINVAL;
2568 } else {
2569 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2570 return JNI_EINVAL;
2571 }
2572 }
2573 // Xminf
2574 } else if (match_option(option, "-Xminf", &tail)) {
2575 char* err;
2576 int minf = (int)(strtod(tail, &err) * 100);
2577 if (*err != '\0' || *tail == '\0') {
2578 jio_fprintf(defaultStream::error_stream(),
2579 "Bad min heap free percentage size: %s\n",
2580 option->optionString);
2581 return JNI_EINVAL;
2582 } else {
2583 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2584 return JNI_EINVAL;
2585 }
2586 }
2587 // -Xss
2588 } else if (match_option(option, "-Xss", &tail)) {
2589 intx value = 0;
2590 jint err = parse_xss(option, tail, &value);
2591 if (err != JNI_OK) {
2592 return err;
2593 }
2594 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2598 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2599 julong long_ReservedCodeCacheSize = 0;
2600
2601 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2602 if (errcode != arg_in_range) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Invalid maximum code cache size: %s.\n", option->optionString);
2605 return JNI_EINVAL;
2606 }
2607 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2608 return JNI_EINVAL;
2609 }
2610 // -green
2611 } else if (match_option(option, "-green")) {
2612 jio_fprintf(defaultStream::error_stream(),
2613 "Green threads support not available\n");
2614 return JNI_EINVAL;
2615 // -native
2616 } else if (match_option(option, "-native")) {
2617 // HotSpot always uses native threads, ignore silently for compatibility
2618 // -Xrs
2619 } else if (match_option(option, "-Xrs")) {
2620 // Classic/EVM option, new functionality
2621 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2622 return JNI_EINVAL;
2623 }
2624 // -Xprof
2625 } else if (match_option(option, "-Xprof")) {
2626 char version[256];
2627 // Obsolete in JDK 10
2628 JDK_Version::jdk(10).to_string(version, sizeof(version));
2629 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2630 // -Xinternalversion
2631 } else if (match_option(option, "-Xinternalversion")) {
2632 jio_fprintf(defaultStream::output_stream(), "%s\n",
2633 VM_Version::internal_vm_info_string());
2634 vm_exit(0);
2635 #ifndef PRODUCT
2636 // -Xprintflags
2637 } else if (match_option(option, "-Xprintflags")) {
2638 JVMFlag::printFlags(tty, false);
2639 vm_exit(0);
2640 #endif
2641 // -D
2642 } else if (match_option(option, "-D", &tail)) {
2643 const char* value;
2644 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2645 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2646 // abort if -Djava.endorsed.dirs is set
2647 jio_fprintf(defaultStream::output_stream(),
2648 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2649 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2650 return JNI_EINVAL;
2651 }
2652 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2653 *value != '\0' && strcmp(value, "\"\"") != 0) {
2654 // abort if -Djava.ext.dirs is set
2655 jio_fprintf(defaultStream::output_stream(),
2656 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2657 return JNI_EINVAL;
2658 }
2659 // Check for module related properties. They must be set using the modules
2660 // options. For example: use "--add-modules=java.sql", not
2661 // "-Djdk.module.addmods=java.sql"
2662 if (is_internal_module_property(option->optionString + 2)) {
2663 needs_module_property_warning = true;
2664 continue;
2665 }
2666 if (!add_property(tail)) {
2667 return JNI_ENOMEM;
2668 }
2669 // Out of the box management support
2670 if (match_option(option, "-Dcom.sun.management", &tail)) {
2671 #if INCLUDE_MANAGEMENT
2672 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 // management agent in module jdk.management.agent
2676 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2677 return JNI_ENOMEM;
2678 }
2679 #else
2680 jio_fprintf(defaultStream::output_stream(),
2681 "-Dcom.sun.management is not supported in this VM.\n");
2682 return JNI_ERR;
2683 #endif
2684 }
2685 // -Xint
2686 } else if (match_option(option, "-Xint")) {
2687 set_mode_flags(_int);
2688 // -Xmixed
2689 } else if (match_option(option, "-Xmixed")) {
2690 set_mode_flags(_mixed);
2691 // -Xcomp
2692 } else if (match_option(option, "-Xcomp")) {
2693 // for testing the compiler; turn off all flags that inhibit compilation
2694 set_mode_flags(_comp);
2695 // -Xshare:dump
2696 } else if (match_option(option, "-Xshare:dump")) {
2697 DumpSharedSpaces = true;
2698 // -Xshare:on
2699 } else if (match_option(option, "-Xshare:on")) {
2700 UseSharedSpaces = true;
2701 RequireSharedSpaces = true;
2702 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2703 } else if (match_option(option, "-Xshare:auto")) {
2704 UseSharedSpaces = true;
2705 RequireSharedSpaces = false;
2706 xshare_auto_cmd_line = true;
2707 // -Xshare:off
2708 } else if (match_option(option, "-Xshare:off")) {
2709 UseSharedSpaces = false;
2710 RequireSharedSpaces = false;
2711 // -Xverify
2712 } else if (match_option(option, "-Xverify", &tail)) {
2713 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2714 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 } else if (strcmp(tail, ":remote") == 0) {
2721 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 } else if (strcmp(tail, ":none") == 0) {
2728 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2735 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2736 return JNI_EINVAL;
2737 }
2738 // -Xdebug
2739 } else if (match_option(option, "-Xdebug")) {
2740 // note this flag has been used, then ignore
2741 set_xdebug_mode(true);
2742 // -Xnoagent
2743 } else if (match_option(option, "-Xnoagent")) {
2744 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2745 } else if (match_option(option, "-Xloggc:", &tail)) {
2746 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2747 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2748 _legacyGCLogging.lastFlag = 2;
2749 _legacyGCLogging.file = os::strdup_check_oom(tail);
2750 } else if (match_option(option, "-Xlog", &tail)) {
2751 bool ret = false;
2752 if (strcmp(tail, ":help") == 0) {
2753 fileStream stream(defaultStream::output_stream());
2754 LogConfiguration::print_command_line_help(&stream);
2755 vm_exit(0);
2756 } else if (strcmp(tail, ":disable") == 0) {
2757 LogConfiguration::disable_logging();
2758 ret = true;
2759 } else if (strcmp(tail, ":async") == 0) {
2760 LogConfiguration::set_async_mode(true);
2761 ret = true;
2762 } else if (*tail == '\0') {
2763 ret = LogConfiguration::parse_command_line_arguments();
2764 assert(ret, "-Xlog without arguments should never fail to parse");
2765 } else if (*tail == ':') {
2766 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2767 }
2768 if (ret == false) {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2771 tail);
2772 return JNI_EINVAL;
2773 }
2774 // JNI hooks
2775 } else if (match_option(option, "-Xcheck", &tail)) {
2776 if (!strcmp(tail, ":jni")) {
2777 #if !INCLUDE_JNI_CHECK
2778 warning("JNI CHECKING is not supported in this VM");
2779 #else
2780 CheckJNICalls = true;
2781 #endif // INCLUDE_JNI_CHECK
2782 } else if (is_bad_option(option, args->ignoreUnrecognized,
2783 "check")) {
2784 return JNI_EINVAL;
2785 }
2786 } else if (match_option(option, "vfprintf")) {
2787 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2788 } else if (match_option(option, "exit")) {
2789 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2790 } else if (match_option(option, "abort")) {
2791 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2792 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2793 // and the last option wins.
2794 } else if (match_option(option, "-XX:+NeverTenure")) {
2795 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2805 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2809 return JNI_EINVAL;
2810 }
2811 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2812 return JNI_EINVAL;
2813 }
2814 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2815 uintx max_tenuring_thresh = 0;
2816 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2819 return JNI_EINVAL;
2820 }
2821
2822 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2823 return JNI_EINVAL;
2824 }
2825
2826 if (MaxTenuringThreshold == 0) {
2827 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2828 return JNI_EINVAL;
2829 }
2830 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 } else {
2834 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2838 return JNI_EINVAL;
2839 }
2840 }
2841 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2842 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2849 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2856 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2863 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 } else if (match_option(option, "--finalization=", &tail)) {
2870 if (strcmp(tail, "enabled") == 0) {
2871 InstanceKlass::set_finalization_enabled(true);
2872 } else if (strcmp(tail, "disabled") == 0) {
2873 InstanceKlass::set_finalization_enabled(false);
2874 } else {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2877 tail);
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2881 #if defined(DTRACE_ENABLED)
2882 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 #else // defined(DTRACE_ENABLED)
2895 jio_fprintf(defaultStream::error_stream(),
2896 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2897 return JNI_EINVAL;
2898 #endif // defined(DTRACE_ENABLED)
2899 #ifdef ASSERT
2900 } else if (match_option(option, "-XX:+FullGCALot")) {
2901 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 // disable scavenge before parallel mark-compact
2905 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2906 return JNI_EINVAL;
2907 }
2908 #endif
2909 #if !INCLUDE_MANAGEMENT
2910 } else if (match_option(option, "-XX:+ManagementServer")) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "ManagementServer is not supported in this VM.\n");
2913 return JNI_ERR;
2914 #endif // INCLUDE_MANAGEMENT
2915 #if INCLUDE_JVMCI
2916 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2917 if (EnableJVMCIProduct) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2920 return JNI_EINVAL;
2921 }
2922 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2923 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2924 if (EnableJVMCIProduct) {
2925 continue;
2926 }
2927 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2928 // Allow this flag if it has been unlocked.
2929 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2930 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2931 jio_fprintf(defaultStream::error_stream(),
2932 "Unable to enable JVMCI in product mode");
2933 return JNI_ERR;
2934 }
2935 }
2936 // The flag was locked so process normally to report that error
2937 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2938 return JNI_EINVAL;
2939 }
2940 #endif // INCLUDE_JVMCI
2941 #if INCLUDE_JFR
2942 } else if (match_jfr_option(&option)) {
2943 return JNI_EINVAL;
2944 #endif
2945 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2946 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2947 // already been handled
2948 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2949 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2950 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2951 return JNI_EINVAL;
2952 }
2953 }
2954 // Unknown option
2955 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2956 return JNI_ERR;
2957 }
2958 }
2959
2960 // PrintSharedArchiveAndExit will turn on
2961 // -Xshare:on
2962 // -Xlog:class+path=info
2963 if (PrintSharedArchiveAndExit) {
2964 UseSharedSpaces = true;
2965 RequireSharedSpaces = true;
2966 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2967 }
2968
2969 fix_appclasspath();
2970
2971 return JNI_OK;
2972 }
2973
2974 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2975 // For java.base check for duplicate --patch-module options being specified on the command line.
2976 // This check is only required for java.base, all other duplicate module specifications
2977 // will be checked during module system initialization. The module system initialization
2978 // will throw an ExceptionInInitializerError if this situation occurs.
2979 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2980 if (*patch_mod_javabase) {
2981 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2982 } else {
2983 *patch_mod_javabase = true;
2984 }
2985 }
2986
2987 // Create GrowableArray lazily, only if --patch-module has been specified
2988 if (_patch_mod_prefix == NULL) {
2989 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2990 }
2991
2992 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2993 }
2994
2995 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2996 //
2997 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2998 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2999 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3000 // path is treated as the current directory.
3001 //
3002 // This causes problems with CDS, which requires that all directories specified in the classpath
3003 // must be empty. In most cases, applications do NOT want to load classes from the current
3004 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3005 // scripts compatible with CDS.
3006 void Arguments::fix_appclasspath() {
3007 if (IgnoreEmptyClassPaths) {
3008 const char separator = *os::path_separator();
3009 const char* src = _java_class_path->value();
3010
3011 // skip over all the leading empty paths
3012 while (*src == separator) {
3013 src ++;
3014 }
3015
3016 char* copy = os::strdup_check_oom(src, mtArguments);
3017
3018 // trim all trailing empty paths
3019 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3020 *tail = '\0';
3021 }
3022
3023 char from[3] = {separator, separator, '\0'};
3024 char to [2] = {separator, '\0'};
3025 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3026 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3027 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3028 }
3029
3030 _java_class_path->set_writeable_value(copy);
3031 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3032 }
3033 }
3034
3035 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3036 // check if the default lib/endorsed directory exists; if so, error
3037 char path[JVM_MAXPATHLEN];
3038 const char* fileSep = os::file_separator();
3039 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3040
3041 DIR* dir = os::opendir(path);
3042 if (dir != NULL) {
3043 jio_fprintf(defaultStream::output_stream(),
3044 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3045 "in modular form will be supported via the concept of upgradeable modules.\n");
3046 os::closedir(dir);
3047 return JNI_ERR;
3048 }
3049
3050 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3051 dir = os::opendir(path);
3052 if (dir != NULL) {
3053 jio_fprintf(defaultStream::output_stream(),
3054 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3055 "Use -classpath instead.\n.");
3056 os::closedir(dir);
3057 return JNI_ERR;
3058 }
3059
3060 // This must be done after all arguments have been processed
3061 // and the container support has been initialized since AggressiveHeap
3062 // relies on the amount of total memory available.
3063 if (AggressiveHeap) {
3064 jint result = set_aggressive_heap_flags();
3065 if (result != JNI_OK) {
3066 return result;
3067 }
3068 }
3069
3070 // This must be done after all arguments have been processed.
3071 // java_compiler() true means set to "NONE" or empty.
3072 if (java_compiler() && !xdebug_mode()) {
3073 // For backwards compatibility, we switch to interpreted mode if
3074 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3075 // not specified.
3076 set_mode_flags(_int);
3077 }
3078
3079 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3080 // but like -Xint, leave compilation thresholds unaffected.
3081 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3082 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3083 set_mode_flags(_int);
3084 }
3085
3086 #ifdef ZERO
3087 // Zero always runs in interpreted mode
3088 set_mode_flags(_int);
3089 #endif
3090
3091 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3092 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3093 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3094 }
3095
3096 #if !COMPILER2_OR_JVMCI
3097 // Don't degrade server performance for footprint
3098 if (FLAG_IS_DEFAULT(UseLargePages) &&
3099 MaxHeapSize < LargePageHeapSizeThreshold) {
3100 // No need for large granularity pages w/small heaps.
3101 // Note that large pages are enabled/disabled for both the
3102 // Java heap and the code cache.
3103 FLAG_SET_DEFAULT(UseLargePages, false);
3104 }
3105
3106 UNSUPPORTED_OPTION(ProfileInterpreter);
3107 #endif
3108
3109 // Parse the CompilationMode flag
3110 if (!CompilationModeFlag::initialize()) {
3111 return JNI_ERR;
3112 }
3113
3114 if (!check_vm_args_consistency()) {
3115 return JNI_ERR;
3116 }
3117
3118 #if INCLUDE_CDS
3119 if (DumpSharedSpaces) {
3120 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3121 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3122 // compiler just to be safe.
3123 //
3124 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3125 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3126 // TODO: revisit the following for the static archive case.
3127 set_mode_flags(_int);
3128 }
3129
3130 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3131 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3132 jio_fprintf(defaultStream::output_stream(),
3133 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3134 return JNI_ERR;
3135 }
3136
3137 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3138 DynamicDumpSharedSpaces = false;
3139 } else {
3140 DynamicDumpSharedSpaces = true;
3141 }
3142
3143 if (AutoCreateSharedArchive) {
3144 if (SharedArchiveFile == NULL) {
3145 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3146 return JNI_ERR;
3147 }
3148 if (ArchiveClassesAtExit != NULL) {
3149 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3150 return JNI_ERR;
3151 }
3152 }
3153
3154 if (UseSharedSpaces && patch_mod_javabase) {
3155 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3156 }
3157 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3158 UseSharedSpaces = false;
3159 }
3160
3161 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3162 // Always verify non-system classes during CDS dump
3163 if (!BytecodeVerificationRemote) {
3164 BytecodeVerificationRemote = true;
3165 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3166 }
3167 }
3168 #endif
3169
3170 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3171 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3172 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3173
3174 return JNI_OK;
3175 }
3176
3177 // Helper class for controlling the lifetime of JavaVMInitArgs
3178 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3179 // deleted on the destruction of the ScopedVMInitArgs object.
3180 class ScopedVMInitArgs : public StackObj {
3181 private:
3182 JavaVMInitArgs _args;
3183 char* _container_name;
3184 bool _is_set;
3185 char* _vm_options_file_arg;
3186
3187 public:
3188 ScopedVMInitArgs(const char *container_name) {
3189 _args.version = JNI_VERSION_1_2;
3190 _args.nOptions = 0;
3191 _args.options = NULL;
3192 _args.ignoreUnrecognized = false;
3193 _container_name = (char *)container_name;
3194 _is_set = false;
3195 _vm_options_file_arg = NULL;
3196 }
3197
3198 // Populates the JavaVMInitArgs object represented by this
3199 // ScopedVMInitArgs object with the arguments in options. The
3200 // allocated memory is deleted by the destructor. If this method
3201 // returns anything other than JNI_OK, then this object is in a
3202 // partially constructed state, and should be abandoned.
3203 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3204 _is_set = true;
3205 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3206 JavaVMOption, options->length(), mtArguments);
3207 if (options_arr == NULL) {
3208 return JNI_ENOMEM;
3209 }
3210 _args.options = options_arr;
3211
3212 for (int i = 0; i < options->length(); i++) {
3213 options_arr[i] = options->at(i);
3214 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3215 if (options_arr[i].optionString == NULL) {
3216 // Rely on the destructor to do cleanup.
3217 _args.nOptions = i;
3218 return JNI_ENOMEM;
3219 }
3220 }
3221
3222 _args.nOptions = options->length();
3223 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3224 return JNI_OK;
3225 }
3226
3227 JavaVMInitArgs* get() { return &_args; }
3228 char* container_name() { return _container_name; }
3229 bool is_set() { return _is_set; }
3230 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3231 char* vm_options_file_arg() { return _vm_options_file_arg; }
3232
3233 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3234 if (_vm_options_file_arg != NULL) {
3235 os::free(_vm_options_file_arg);
3236 }
3237 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3238 }
3239
3240 ~ScopedVMInitArgs() {
3241 if (_vm_options_file_arg != NULL) {
3242 os::free(_vm_options_file_arg);
3243 }
3244 if (_args.options == NULL) return;
3245 for (int i = 0; i < _args.nOptions; i++) {
3246 os::free(_args.options[i].optionString);
3247 }
3248 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3249 }
3250
3251 // Insert options into this option list, to replace option at
3252 // vm_options_file_pos (-XX:VMOptionsFile)
3253 jint insert(const JavaVMInitArgs* args,
3254 const JavaVMInitArgs* args_to_insert,
3255 const int vm_options_file_pos) {
3256 assert(_args.options == NULL, "shouldn't be set yet");
3257 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3258 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3259
3260 int length = args->nOptions + args_to_insert->nOptions - 1;
3261 // Construct new option array
3262 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3263 for (int i = 0; i < args->nOptions; i++) {
3264 if (i == vm_options_file_pos) {
3265 // insert the new options starting at the same place as the
3266 // -XX:VMOptionsFile option
3267 for (int j = 0; j < args_to_insert->nOptions; j++) {
3268 options.push(args_to_insert->options[j]);
3269 }
3270 } else {
3271 options.push(args->options[i]);
3272 }
3273 }
3274 // make into options array
3275 return set_args(&options);
3276 }
3277 };
3278
3279 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3280 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3281 }
3282
3283 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3284 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3285 }
3286
3287 jint Arguments::parse_options_environment_variable(const char* name,
3288 ScopedVMInitArgs* vm_args) {
3289 char *buffer = ::getenv(name);
3290
3291 // Don't check this environment variable if user has special privileges
3292 // (e.g. unix su command).
3293 if (buffer == NULL || os::have_special_privileges()) {
3294 return JNI_OK;
3295 }
3296
3297 if ((buffer = os::strdup(buffer)) == NULL) {
3298 return JNI_ENOMEM;
3299 }
3300
3301 jio_fprintf(defaultStream::error_stream(),
3302 "Picked up %s: %s\n", name, buffer);
3303
3304 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3305
3306 os::free(buffer);
3307 return retcode;
3308 }
3309
3310 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3311 // read file into buffer
3312 int fd = ::open(file_name, O_RDONLY);
3313 if (fd < 0) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Could not open options file '%s'\n",
3316 file_name);
3317 return JNI_ERR;
3318 }
3319
3320 struct stat stbuf;
3321 int retcode = os::stat(file_name, &stbuf);
3322 if (retcode != 0) {
3323 jio_fprintf(defaultStream::error_stream(),
3324 "Could not stat options file '%s'\n",
3325 file_name);
3326 ::close(fd);
3327 return JNI_ERR;
3328 }
3329
3330 if (stbuf.st_size == 0) {
3331 // tell caller there is no option data and that is ok
3332 ::close(fd);
3333 return JNI_OK;
3334 }
3335
3336 // '+ 1' for NULL termination even with max bytes
3337 size_t bytes_alloc = stbuf.st_size + 1;
3338
3339 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3340 if (NULL == buf) {
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Could not allocate read buffer for options file parse\n");
3343 ::close(fd);
3344 return JNI_ENOMEM;
3345 }
3346
3347 memset(buf, 0, bytes_alloc);
3348
3349 // Fill buffer
3350 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3351 ::close(fd);
3352 if (bytes_read < 0) {
3353 FREE_C_HEAP_ARRAY(char, buf);
3354 jio_fprintf(defaultStream::error_stream(),
3355 "Could not read options file '%s'\n", file_name);
3356 return JNI_ERR;
3357 }
3358
3359 if (bytes_read == 0) {
3360 // tell caller there is no option data and that is ok
3361 FREE_C_HEAP_ARRAY(char, buf);
3362 return JNI_OK;
3363 }
3364
3365 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3366
3367 FREE_C_HEAP_ARRAY(char, buf);
3368 return retcode;
3369 }
3370
3371 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3372 // Construct option array
3373 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3374
3375 // some pointers to help with parsing
3376 char *buffer_end = buffer + buf_len;
3377 char *opt_hd = buffer;
3378 char *wrt = buffer;
3379 char *rd = buffer;
3380
3381 // parse all options
3382 while (rd < buffer_end) {
3383 // skip leading white space from the input string
3384 while (rd < buffer_end && isspace(*rd)) {
3385 rd++;
3386 }
3387
3388 if (rd >= buffer_end) {
3389 break;
3390 }
3391
3392 // Remember this is where we found the head of the token.
3393 opt_hd = wrt;
3394
3395 // Tokens are strings of non white space characters separated
3396 // by one or more white spaces.
3397 while (rd < buffer_end && !isspace(*rd)) {
3398 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3399 int quote = *rd; // matching quote to look for
3400 rd++; // don't copy open quote
3401 while (rd < buffer_end && *rd != quote) {
3402 // include everything (even spaces)
3403 // up until the close quote
3404 *wrt++ = *rd++; // copy to option string
3405 }
3406
3407 if (rd < buffer_end) {
3408 rd++; // don't copy close quote
3409 } else {
3410 // did not see closing quote
3411 jio_fprintf(defaultStream::error_stream(),
3412 "Unmatched quote in %s\n", name);
3413 return JNI_ERR;
3414 }
3415 } else {
3416 *wrt++ = *rd++; // copy to option string
3417 }
3418 }
3419
3420 // steal a white space character and set it to NULL
3421 *wrt++ = '\0';
3422 // We now have a complete token
3423
3424 JavaVMOption option;
3425 option.optionString = opt_hd;
3426 option.extraInfo = NULL;
3427
3428 options.append(option); // Fill in option
3429
3430 rd++; // Advance to next character
3431 }
3432
3433 // Fill out JavaVMInitArgs structure.
3434 return vm_args->set_args(&options);
3435 }
3436
3437 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3438 if (DumpSharedSpaces) {
3439 if (RequireSharedSpaces) {
3440 warning("Cannot dump shared archive while using shared archive");
3441 }
3442 UseSharedSpaces = false;
3443 }
3444 #if INCLUDE_CDS
3445 // Initialize shared archive paths which could include both base and dynamic archive paths
3446 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3447 //
3448 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3449 if (DumpSharedSpaces || UseSharedSpaces) {
3450 init_shared_archive_paths();
3451 }
3452 #endif // INCLUDE_CDS
3453 }
3454
3455 #if INCLUDE_CDS
3456 // Sharing support
3457 // Construct the path to the archive
3458 char* Arguments::get_default_shared_archive_path() {
3459 char *default_archive_path;
3460 char jvm_path[JVM_MAXPATHLEN];
3461 os::jvm_path(jvm_path, sizeof(jvm_path));
3462 char *end = strrchr(jvm_path, *os::file_separator());
3463 if (end != NULL) *end = '\0';
3464 size_t jvm_path_len = strlen(jvm_path);
3465 size_t file_sep_len = strlen(os::file_separator());
3466 const size_t len = jvm_path_len + file_sep_len + 20;
3467 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3468 jio_snprintf(default_archive_path, len,
3469 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3470 jvm_path, os::file_separator());
3471 return default_archive_path;
3472 }
3473
3474 int Arguments::num_archives(const char* archive_path) {
3475 if (archive_path == NULL) {
3476 return 0;
3477 }
3478 int npaths = 1;
3479 char* p = (char*)archive_path;
3480 while (*p != '\0') {
3481 if (*p == os::path_separator()[0]) {
3482 npaths++;
3483 }
3484 p++;
3485 }
3486 return npaths;
3487 }
3488
3489 void Arguments::extract_shared_archive_paths(const char* archive_path,
3490 char** base_archive_path,
3491 char** top_archive_path) {
3492 char* begin_ptr = (char*)archive_path;
3493 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3494 if (end_ptr == NULL || end_ptr == begin_ptr) {
3495 vm_exit_during_initialization("Base archive was not specified", archive_path);
3496 }
3497 size_t len = end_ptr - begin_ptr;
3498 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3499 strncpy(cur_path, begin_ptr, len);
3500 cur_path[len] = '\0';
3501 *base_archive_path = cur_path;
3502
3503 begin_ptr = ++end_ptr;
3504 if (*begin_ptr == '\0') {
3505 vm_exit_during_initialization("Top archive was not specified", archive_path);
3506 }
3507 end_ptr = strchr(begin_ptr, '\0');
3508 assert(end_ptr != NULL, "sanity");
3509 len = end_ptr - begin_ptr;
3510 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3511 strncpy(cur_path, begin_ptr, len + 1);
3512 *top_archive_path = cur_path;
3513 }
3514
3515 void Arguments::init_shared_archive_paths() {
3516 if (ArchiveClassesAtExit != nullptr) {
3517 assert(!RecordDynamicDumpInfo, "already checked");
3518 if (DumpSharedSpaces) {
3519 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3520 }
3521 check_unsupported_dumping_properties();
3522
3523 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3524 vm_exit_during_initialization(
3525 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3526 }
3527 }
3528
3529 if (SharedArchiveFile == nullptr) {
3530 SharedArchivePath = get_default_shared_archive_path();
3531 } else {
3532 int archives = num_archives(SharedArchiveFile);
3533 assert(archives > 0, "must be");
3534
3535 if (is_dumping_archive() && archives > 1) {
3536 vm_exit_during_initialization(
3537 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3538 }
3539
3540 if (DumpSharedSpaces) {
3541 assert(archives == 1, "must be");
3542 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3543 // will be overwritten no matter regardless of its contents
3544 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3545 } else {
3546 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3547 // is read from top.jsa
3548 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3549 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3550 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3551 //
3552 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3553 // allow cases (b) and (c). Case (b) is already checked above.
3554
3555 if (archives > 2) {
3556 vm_exit_during_initialization(
3557 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3558 }
3559 if (archives == 1) {
3560 char* base_archive_path = NULL;
3561 bool success =
3562 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3563 if (!success) {
3564 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3565 // regenerate the dynamic archive base on default archive.
3566 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3567 DynamicDumpSharedSpaces = true;
3568 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3569 SharedArchivePath = get_default_shared_archive_path();
3570 SharedArchiveFile = nullptr;
3571 } else {
3572 no_shared_spaces("invalid archive");
3573 }
3574 } else if (base_archive_path == NULL) {
3575 // User has specified a single archive, which is a static archive.
3576 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3577 } else {
3578 // User has specified a single archive, which is a dynamic archive.
3579 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3580 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3581 }
3582 } else {
3583 extract_shared_archive_paths((const char*)SharedArchiveFile,
3584 &SharedArchivePath, &SharedDynamicArchivePath);
3585 if (SharedArchivePath == NULL) {
3586 assert(SharedDynamicArchivePath == NULL, "must be");
3587 no_shared_spaces("invalid archive");
3588 }
3589 }
3590
3591 if (SharedDynamicArchivePath != nullptr) {
3592 // Check for case (c)
3593 if (RecordDynamicDumpInfo) {
3594 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3595 SharedArchiveFile);
3596 }
3597 if (ArchiveClassesAtExit != nullptr) {
3598 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3599 SharedArchiveFile);
3600 }
3601 }
3602
3603 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3604 vm_exit_during_initialization(
3605 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3606 SharedArchiveFile);
3607 }
3608 }
3609 }
3610 }
3611 #endif // INCLUDE_CDS
3612
3613 #ifndef PRODUCT
3614 // Determine whether LogVMOutput should be implicitly turned on.
3615 static bool use_vm_log() {
3616 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3617 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3618 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3619 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3620 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3621 return true;
3622 }
3623
3624 #ifdef COMPILER1
3625 if (PrintC1Statistics) {
3626 return true;
3627 }
3628 #endif // COMPILER1
3629
3630 #ifdef COMPILER2
3631 if (PrintOptoAssembly || PrintOptoStatistics) {
3632 return true;
3633 }
3634 #endif // COMPILER2
3635
3636 return false;
3637 }
3638
3639 #endif // PRODUCT
3640
3641 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3642 for (int index = 0; index < args->nOptions; index++) {
3643 const JavaVMOption* option = args->options + index;
3644 const char* tail;
3645 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3646 return true;
3647 }
3648 }
3649 return false;
3650 }
3651
3652 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3653 const char* vm_options_file,
3654 const int vm_options_file_pos,
3655 ScopedVMInitArgs* vm_options_file_args,
3656 ScopedVMInitArgs* args_out) {
3657 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3658 if (code != JNI_OK) {
3659 return code;
3660 }
3661
3662 if (vm_options_file_args->get()->nOptions < 1) {
3663 return JNI_OK;
3664 }
3665
3666 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3667 jio_fprintf(defaultStream::error_stream(),
3668 "A VM options file may not refer to a VM options file. "
3669 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3670 "options file '%s' in options container '%s' is an error.\n",
3671 vm_options_file_args->vm_options_file_arg(),
3672 vm_options_file_args->container_name());
3673 return JNI_EINVAL;
3674 }
3675
3676 return args_out->insert(args, vm_options_file_args->get(),
3677 vm_options_file_pos);
3678 }
3679
3680 // Expand -XX:VMOptionsFile found in args_in as needed.
3681 // mod_args and args_out parameters may return values as needed.
3682 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3683 ScopedVMInitArgs* mod_args,
3684 JavaVMInitArgs** args_out) {
3685 jint code = match_special_option_and_act(args_in, mod_args);
3686 if (code != JNI_OK) {
3687 return code;
3688 }
3689
3690 if (mod_args->is_set()) {
3691 // args_in contains -XX:VMOptionsFile and mod_args contains the
3692 // original options from args_in along with the options expanded
3693 // from the VMOptionsFile. Return a short-hand to the caller.
3694 *args_out = mod_args->get();
3695 } else {
3696 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3697 }
3698 return JNI_OK;
3699 }
3700
3701 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3702 ScopedVMInitArgs* args_out) {
3703 // Remaining part of option string
3704 const char* tail;
3705 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3706
3707 for (int index = 0; index < args->nOptions; index++) {
3708 const JavaVMOption* option = args->options + index;
3709 if (match_option(option, "-XX:Flags=", &tail)) {
3710 Arguments::set_jvm_flags_file(tail);
3711 continue;
3712 }
3713 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3714 if (vm_options_file_args.found_vm_options_file_arg()) {
3715 jio_fprintf(defaultStream::error_stream(),
3716 "The option '%s' is already specified in the options "
3717 "container '%s' so the specification of '%s' in the "
3718 "same options container is an error.\n",
3719 vm_options_file_args.vm_options_file_arg(),
3720 vm_options_file_args.container_name(),
3721 option->optionString);
3722 return JNI_EINVAL;
3723 }
3724 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3725 // If there's a VMOptionsFile, parse that
3726 jint code = insert_vm_options_file(args, tail, index,
3727 &vm_options_file_args, args_out);
3728 if (code != JNI_OK) {
3729 return code;
3730 }
3731 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3732 if (args_out->is_set()) {
3733 // The VMOptions file inserted some options so switch 'args'
3734 // to the new set of options, and continue processing which
3735 // preserves "last option wins" semantics.
3736 args = args_out->get();
3737 // The first option from the VMOptionsFile replaces the
3738 // current option. So we back track to process the
3739 // replacement option.
3740 index--;
3741 }
3742 continue;
3743 }
3744 if (match_option(option, "-XX:+PrintVMOptions")) {
3745 PrintVMOptions = true;
3746 continue;
3747 }
3748 if (match_option(option, "-XX:-PrintVMOptions")) {
3749 PrintVMOptions = false;
3750 continue;
3751 }
3752 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3753 IgnoreUnrecognizedVMOptions = true;
3754 continue;
3755 }
3756 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3757 IgnoreUnrecognizedVMOptions = false;
3758 continue;
3759 }
3760 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3761 JVMFlag::printFlags(tty, false);
3762 vm_exit(0);
3763 }
3764
3765 #ifndef PRODUCT
3766 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3767 JVMFlag::printFlags(tty, true);
3768 vm_exit(0);
3769 }
3770 #endif
3771 }
3772 return JNI_OK;
3773 }
3774
3775 static void print_options(const JavaVMInitArgs *args) {
3776 const char* tail;
3777 for (int index = 0; index < args->nOptions; index++) {
3778 const JavaVMOption *option = args->options + index;
3779 if (match_option(option, "-XX:", &tail)) {
3780 logOption(tail);
3781 }
3782 }
3783 }
3784
3785 bool Arguments::handle_deprecated_print_gc_flags() {
3786 if (PrintGC) {
3787 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3788 }
3789 if (PrintGCDetails) {
3790 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3791 }
3792
3793 if (_legacyGCLogging.lastFlag == 2) {
3794 // -Xloggc was used to specify a filename
3795 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3796
3797 LogTarget(Error, logging) target;
3798 LogStream errstream(target);
3799 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3800 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3801 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3802 }
3803 return true;
3804 }
3805
3806 static void apply_debugger_ergo() {
3807 if (ReplayCompiles) {
3808 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3809 }
3810
3811 if (UseDebuggerErgo) {
3812 // Turn on sub-flags
3813 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3814 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3815 }
3816
3817 if (UseDebuggerErgo2) {
3818 // Debugging with limited number of CPUs
3819 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3820 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3821 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3822 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3823 }
3824 }
3825
3826 // Parse entry point called from JNI_CreateJavaVM
3827
3828 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3829 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3830 JVMFlag::check_all_flag_declarations();
3831
3832 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3833 const char* hotspotrc = ".hotspotrc";
3834 bool settings_file_specified = false;
3835 bool needs_hotspotrc_warning = false;
3836 ScopedVMInitArgs initial_vm_options_args("");
3837 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3838 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3839
3840 // Pointers to current working set of containers
3841 JavaVMInitArgs* cur_cmd_args;
3842 JavaVMInitArgs* cur_vm_options_args;
3843 JavaVMInitArgs* cur_java_options_args;
3844 JavaVMInitArgs* cur_java_tool_options_args;
3845
3846 // Containers for modified/expanded options
3847 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3848 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3849 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3850 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3851
3852
3853 jint code =
3854 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3855 if (code != JNI_OK) {
3856 return code;
3857 }
3858
3859 code = parse_java_options_environment_variable(&initial_java_options_args);
3860 if (code != JNI_OK) {
3861 return code;
3862 }
3863
3864 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3865 char *vmoptions = ClassLoader::lookup_vm_options();
3866 if (vmoptions != NULL) {
3867 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3868 FREE_C_HEAP_ARRAY(char, vmoptions);
3869 if (code != JNI_OK) {
3870 return code;
3871 }
3872 }
3873
3874 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3875 &mod_java_tool_options_args,
3876 &cur_java_tool_options_args);
3877 if (code != JNI_OK) {
3878 return code;
3879 }
3880
3881 code = expand_vm_options_as_needed(initial_cmd_args,
3882 &mod_cmd_args,
3883 &cur_cmd_args);
3884 if (code != JNI_OK) {
3885 return code;
3886 }
3887
3888 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3889 &mod_java_options_args,
3890 &cur_java_options_args);
3891 if (code != JNI_OK) {
3892 return code;
3893 }
3894
3895 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3896 &mod_vm_options_args,
3897 &cur_vm_options_args);
3898 if (code != JNI_OK) {
3899 return code;
3900 }
3901
3902 const char* flags_file = Arguments::get_jvm_flags_file();
3903 settings_file_specified = (flags_file != NULL);
3904
3905 if (IgnoreUnrecognizedVMOptions) {
3906 cur_cmd_args->ignoreUnrecognized = true;
3907 cur_java_tool_options_args->ignoreUnrecognized = true;
3908 cur_java_options_args->ignoreUnrecognized = true;
3909 }
3910
3911 // Parse specified settings file
3912 if (settings_file_specified) {
3913 if (!process_settings_file(flags_file, true,
3914 cur_cmd_args->ignoreUnrecognized)) {
3915 return JNI_EINVAL;
3916 }
3917 } else {
3918 #ifdef ASSERT
3919 // Parse default .hotspotrc settings file
3920 if (!process_settings_file(".hotspotrc", false,
3921 cur_cmd_args->ignoreUnrecognized)) {
3922 return JNI_EINVAL;
3923 }
3924 #else
3925 struct stat buf;
3926 if (os::stat(hotspotrc, &buf) == 0) {
3927 needs_hotspotrc_warning = true;
3928 }
3929 #endif
3930 }
3931
3932 if (PrintVMOptions) {
3933 print_options(cur_java_tool_options_args);
3934 print_options(cur_cmd_args);
3935 print_options(cur_java_options_args);
3936 }
3937
3938 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3939 jint result = parse_vm_init_args(cur_vm_options_args,
3940 cur_java_tool_options_args,
3941 cur_java_options_args,
3942 cur_cmd_args);
3943
3944 if (result != JNI_OK) {
3945 return result;
3946 }
3947
3948 // Delay warning until here so that we've had a chance to process
3949 // the -XX:-PrintWarnings flag
3950 if (needs_hotspotrc_warning) {
3951 warning("%s file is present but has been ignored. "
3952 "Run with -XX:Flags=%s to load the file.",
3953 hotspotrc, hotspotrc);
3954 }
3955
3956 if (needs_module_property_warning) {
3957 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3958 " names that are reserved for internal use.");
3959 }
3960
3961 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3962 UNSUPPORTED_OPTION(UseLargePages);
3963 #endif
3964
3965 #if defined(AIX)
3966 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3967 #endif
3968
3969 #ifndef PRODUCT
3970 if (TraceBytecodesAt != 0) {
3971 TraceBytecodes = true;
3972 }
3973 if (CountCompiledCalls) {
3974 if (UseCounterDecay) {
3975 warning("UseCounterDecay disabled because CountCalls is set");
3976 UseCounterDecay = false;
3977 }
3978 }
3979 #endif // PRODUCT
3980
3981 if (ScavengeRootsInCode == 0) {
3982 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3983 warning("Forcing ScavengeRootsInCode non-zero");
3984 }
3985 ScavengeRootsInCode = 1;
3986 }
3987
3988 if (!handle_deprecated_print_gc_flags()) {
3989 return JNI_EINVAL;
3990 }
3991
3992 // Set object alignment values.
3993 set_object_alignment();
3994
3995 #if !INCLUDE_CDS
3996 if (DumpSharedSpaces || RequireSharedSpaces) {
3997 jio_fprintf(defaultStream::error_stream(),
3998 "Shared spaces are not supported in this VM\n");
3999 return JNI_ERR;
4000 }
4001 if (DumpLoadedClassList != NULL) {
4002 jio_fprintf(defaultStream::error_stream(),
4003 "DumpLoadedClassList is not supported in this VM\n");
4004 return JNI_ERR;
4005 }
4006 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
4007 log_is_enabled(Info, cds)) {
4008 warning("Shared spaces are not supported in this VM");
4009 UseSharedSpaces = false;
4010 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4011 }
4012 no_shared_spaces("CDS Disabled");
4013 #endif // INCLUDE_CDS
4014
4015 #if INCLUDE_NMT
4016 // Verify NMT arguments
4017 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
4018 if (lvl == NMT_unknown) {
4019 jio_fprintf(defaultStream::error_stream(),
4020 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4021 return JNI_ERR;
4022 }
4023 if (PrintNMTStatistics && lvl == NMT_off) {
4024 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
4025 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
4026 }
4027 #else
4028 if (!FLAG_IS_DEFAULT(NativeMemoryTracking) || PrintNMTStatistics) {
4029 warning("Native Memory Tracking is not supported in this VM");
4030 FLAG_SET_DEFAULT(NativeMemoryTracking, "off");
4031 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
4032 }
4033 #endif // INCLUDE_NMT
4034
4035 if (TraceDependencies && VerifyDependencies) {
4036 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
4037 warning("TraceDependencies results may be inflated by VerifyDependencies");
4038 }
4039 }
4040
4041 apply_debugger_ergo();
4042
4043 if (log_is_enabled(Info, arguments)) {
4044 LogStream st(Log(arguments)::info());
4045 Arguments::print_on(&st);
4046 }
4047
4048 return JNI_OK;
4049 }
4050
4051 jint Arguments::apply_ergo() {
4052 // Set flags based on ergonomics.
4053 jint result = set_ergonomics_flags();
4054 if (result != JNI_OK) return result;
4055
4056 // Set heap size based on available physical memory
4057 set_heap_size();
4058
4059 GCConfig::arguments()->initialize();
4060
4061 set_shared_spaces_flags_and_archive_paths();
4062
4063 // Initialize Metaspace flags and alignments
4064 Metaspace::ergo_initialize();
4065
4066 if (!StringDedup::ergo_initialize()) {
4067 return JNI_EINVAL;
4068 }
4069
4070 // Set compiler flags after GC is selected and GC specific
4071 // flags (LoopStripMiningIter) are set.
4072 CompilerConfig::ergo_initialize();
4073
4074 // Set bytecode rewriting flags
4075 set_bytecode_flags();
4076
4077 // Set flags if aggressive optimization flags are enabled
4078 jint code = set_aggressive_opts_flags();
4079 if (code != JNI_OK) {
4080 return code;
4081 }
4082
4083 #ifdef ZERO
4084 // Clear flags not supported on zero.
4085 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4086
4087 if (LogTouchedMethods) {
4088 warning("LogTouchedMethods is not supported for Zero");
4089 FLAG_SET_DEFAULT(LogTouchedMethods, false);
4090 }
4091 #endif // ZERO
4092
4093 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4094 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4095 DebugNonSafepoints = true;
4096 }
4097
4098 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4099 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4100 }
4101
4102 // Treat the odd case where local verification is enabled but remote
4103 // verification is not as if both were enabled.
4104 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4105 log_info(verification)("Turning on remote verification because local verification is on");
4106 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4107 }
4108
4109 #ifndef PRODUCT
4110 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4111 if (use_vm_log()) {
4112 LogVMOutput = true;
4113 }
4114 }
4115 #endif // PRODUCT
4116
4117 if (PrintCommandLineFlags) {
4118 JVMFlag::printSetFlags(tty);
4119 }
4120
4121 #ifdef COMPILER2
4122 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4123 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4124 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4125 }
4126 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4127
4128 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4129 if (!EnableVectorReboxing) {
4130 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4131 } else {
4132 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4133 }
4134 }
4135 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4136
4137 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4138 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4139 }
4140 FLAG_SET_DEFAULT(UseVectorStubs, false);
4141 }
4142 #endif // COMPILER2
4143
4144 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4145 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4146 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4147 }
4148 }
4149 return JNI_OK;
4150 }
4151
4152 jint Arguments::adjust_after_os() {
4153 if (UseNUMA) {
4154 if (UseParallelGC) {
4155 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4156 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4157 }
4158 }
4159 }
4160 return JNI_OK;
4161 }
4162
4163 int Arguments::PropertyList_count(SystemProperty* pl) {
4164 int count = 0;
4165 while(pl != NULL) {
4166 count++;
4167 pl = pl->next();
4168 }
4169 return count;
4170 }
4171
4172 // Return the number of readable properties.
4173 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4174 int count = 0;
4175 while(pl != NULL) {
4176 if (pl->is_readable()) {
4177 count++;
4178 }
4179 pl = pl->next();
4180 }
4181 return count;
4182 }
4183
4184 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4185 assert(key != NULL, "just checking");
4186 SystemProperty* prop;
4187 for (prop = pl; prop != NULL; prop = prop->next()) {
4188 if (strcmp(key, prop->key()) == 0) return prop->value();
4189 }
4190 return NULL;
4191 }
4192
4193 // Return the value of the requested property provided that it is a readable property.
4194 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4195 assert(key != NULL, "just checking");
4196 SystemProperty* prop;
4197 // Return the property value if the keys match and the property is not internal or
4198 // it's the special internal property "jdk.boot.class.path.append".
4199 for (prop = pl; prop != NULL; prop = prop->next()) {
4200 if (strcmp(key, prop->key()) == 0) {
4201 if (!prop->internal()) {
4202 return prop->value();
4203 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4204 return prop->value();
4205 } else {
4206 // Property is internal and not jdk.boot.class.path.append so return NULL.
4207 return NULL;
4208 }
4209 }
4210 }
4211 return NULL;
4212 }
4213
4214 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4215 int count = 0;
4216 const char* ret_val = NULL;
4217
4218 while(pl != NULL) {
4219 if(count >= index) {
4220 ret_val = pl->key();
4221 break;
4222 }
4223 count++;
4224 pl = pl->next();
4225 }
4226
4227 return ret_val;
4228 }
4229
4230 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4231 int count = 0;
4232 char* ret_val = NULL;
4233
4234 while(pl != NULL) {
4235 if(count >= index) {
4236 ret_val = pl->value();
4237 break;
4238 }
4239 count++;
4240 pl = pl->next();
4241 }
4242
4243 return ret_val;
4244 }
4245
4246 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4247 SystemProperty* p = *plist;
4248 if (p == NULL) {
4249 *plist = new_p;
4250 } else {
4251 while (p->next() != NULL) {
4252 p = p->next();
4253 }
4254 p->set_next(new_p);
4255 }
4256 }
4257
4258 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4259 bool writeable, bool internal) {
4260 if (plist == NULL)
4261 return;
4262
4263 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4264 PropertyList_add(plist, new_p);
4265 }
4266
4267 void Arguments::PropertyList_add(SystemProperty *element) {
4268 PropertyList_add(&_system_properties, element);
4269 }
4270
4271 // This add maintains unique property key in the list.
4272 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4273 PropertyAppendable append, PropertyWriteable writeable,
4274 PropertyInternal internal) {
4275 if (plist == NULL)
4276 return;
4277
4278 // If property key exists and is writeable, then update with new value.
4279 // Trying to update a non-writeable property is silently ignored.
4280 SystemProperty* prop;
4281 for (prop = *plist; prop != NULL; prop = prop->next()) {
4282 if (strcmp(k, prop->key()) == 0) {
4283 if (append == AppendProperty) {
4284 prop->append_writeable_value(v);
4285 } else {
4286 prop->set_writeable_value(v);
4287 }
4288 return;
4289 }
4290 }
4291
4292 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4293 }
4294
4295 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4296 // Returns true if all of the source pointed by src has been copied over to
4297 // the destination buffer pointed by buf. Otherwise, returns false.
4298 // Notes:
4299 // 1. If the length (buflen) of the destination buffer excluding the
4300 // NULL terminator character is not long enough for holding the expanded
4301 // pid characters, it also returns false instead of returning the partially
4302 // expanded one.
4303 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4304 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4305 char* buf, size_t buflen) {
4306 const char* p = src;
4307 char* b = buf;
4308 const char* src_end = &src[srclen];
4309 char* buf_end = &buf[buflen - 1];
4310
4311 while (p < src_end && b < buf_end) {
4312 if (*p == '%') {
4313 switch (*(++p)) {
4314 case '%': // "%%" ==> "%"
4315 *b++ = *p++;
4316 break;
4317 case 'p': { // "%p" ==> current process id
4318 // buf_end points to the character before the last character so
4319 // that we could write '\0' to the end of the buffer.
4320 size_t buf_sz = buf_end - b + 1;
4321 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4322
4323 // if jio_snprintf fails or the buffer is not long enough to hold
4324 // the expanded pid, returns false.
4325 if (ret < 0 || ret >= (int)buf_sz) {
4326 return false;
4327 } else {
4328 b += ret;
4329 assert(*b == '\0', "fail in copy_expand_pid");
4330 if (p == src_end && b == buf_end + 1) {
4331 // reach the end of the buffer.
4332 return true;
4333 }
4334 }
4335 p++;
4336 break;
4337 }
4338 default :
4339 *b++ = '%';
4340 }
4341 } else {
4342 *b++ = *p++;
4343 }
4344 }
4345 *b = '\0';
4346 return (p == src_end); // return false if not all of the source was copied
4347 }