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 "metaprogramming/enableIf.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/flags/jvmFlag.hpp"
49 #include "runtime/flags/jvmFlagAccess.hpp"
50 #include "runtime/flags/jvmFlagLimit.hpp"
51 #include "runtime/globals_extension.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/os.hpp"
54 #include "runtime/safepoint.hpp"
55 #include "runtime/safepointMechanism.hpp"
56 #include "runtime/vm_version.hpp"
57 #include "services/management.hpp"
58 #include "services/nmtCommon.hpp"
59 #include "utilities/align.hpp"
60 #include "utilities/debug.hpp"
61 #include "utilities/defaultStream.hpp"
62 #include "utilities/macros.hpp"
63 #include "utilities/powerOfTwo.hpp"
64 #include "utilities/stringUtils.hpp"
65 #if INCLUDE_JFR
66 #include "jfr/jfr.hpp"
67 #endif
68 #include <limits>
69
70 #define DEFAULT_JAVA_LAUNCHER "generic"
71
72 char* Arguments::_jvm_flags_file = NULL;
73 char** Arguments::_jvm_flags_array = NULL;
74 int Arguments::_num_jvm_flags = 0;
75 char** Arguments::_jvm_args_array = NULL;
76 int Arguments::_num_jvm_args = 0;
77 char* Arguments::_java_command = NULL;
78 SystemProperty* Arguments::_system_properties = NULL;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = NULL;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 bool Arguments::_sun_java_launcher_is_altjvm = false;
86
87 // These parameters are reset in method parse_vm_init_args()
88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
90 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
91 bool Arguments::_ClipInlining = ClipInlining;
92 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
93
94 bool Arguments::_enable_preview = false;
95
96 char* Arguments::SharedArchivePath = NULL;
97 char* Arguments::SharedDynamicArchivePath = NULL;
98
99 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 // These are not set by the JDK's built-in launchers, but they can be set by
105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
106 // JavaVMOption in jni.h.
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
117 SystemProperty *Arguments::_vm_info = NULL;
118
119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
120 PathString *Arguments::_system_boot_class_path = NULL;
121 bool Arguments::_has_jimage = false;
122
123 char* Arguments::_ext_dirs = NULL;
124
125 // True if -Xshare:auto option was specified.
126 static bool xshare_auto_cmd_line = false;
127
128 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
129 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
130 if (new_value == NULL) {
131 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
132 return false;
133 }
134 if (_value != NULL) {
135 FreeHeap(_value);
136 }
137 _value = new_value;
138 strcpy(_value, value);
139 return true;
140 }
141
142 void PathString::append_value(const char *value) {
143 char *sp;
144 size_t len = 0;
145 if (value != NULL) {
146 len = strlen(value);
147 if (_value != NULL) {
148 len += strlen(_value);
149 }
150 sp = AllocateHeap(len+2, mtArguments);
151 assert(sp != NULL, "Unable to allocate space for new append path value");
152 if (sp != NULL) {
153 if (_value != NULL) {
154 strcpy(sp, _value);
155 strcat(sp, os::path_separator());
156 strcat(sp, value);
157 FreeHeap(_value);
158 } else {
159 strcpy(sp, value);
160 }
161 _value = sp;
162 }
163 }
164 }
165
166 PathString::PathString(const char* value) {
167 if (value == NULL) {
168 _value = NULL;
169 } else {
170 _value = AllocateHeap(strlen(value)+1, mtArguments);
171 strcpy(_value, value);
172 }
173 }
174
175 PathString::~PathString() {
176 if (_value != NULL) {
177 FreeHeap(_value);
178 _value = NULL;
179 }
180 }
181
182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
183 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
184 size_t len = strlen(module_name) + 1;
185 _module_name = AllocateHeap(len, mtInternal);
186 strncpy(_module_name, module_name, len); // copy the trailing null
187 _path = new PathString(path);
188 }
189
190 ModulePatchPath::~ModulePatchPath() {
191 if (_module_name != NULL) {
192 FreeHeap(_module_name);
193 _module_name = NULL;
194 }
195 if (_path != NULL) {
196 delete _path;
197 _path = NULL;
198 }
199 }
200
201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
202 if (key == NULL) {
203 _key = NULL;
204 } else {
205 _key = AllocateHeap(strlen(key)+1, mtArguments);
206 strcpy(_key, key);
207 }
208 _next = NULL;
209 _internal = internal;
210 _writeable = writeable;
211 }
212
213 AgentLibrary::AgentLibrary(const char* name, const char* options,
214 bool is_absolute_path, void* os_lib,
215 bool instrument_lib) {
216 _name = AllocateHeap(strlen(name)+1, mtArguments);
217 strcpy(_name, name);
218 if (options == NULL) {
219 _options = NULL;
220 } else {
221 _options = AllocateHeap(strlen(options)+1, mtArguments);
222 strcpy(_options, options);
223 }
224 _is_absolute_path = is_absolute_path;
225 _os_lib = os_lib;
226 _next = NULL;
227 _state = agent_invalid;
228 _is_static_lib = false;
229 _is_instrument_lib = instrument_lib;
230 }
231
232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
233 // part of the option string.
234 static bool match_option(const JavaVMOption *option, const char* name,
235 const char** tail) {
236 size_t len = strlen(name);
237 if (strncmp(option->optionString, name, len) == 0) {
238 *tail = option->optionString + len;
239 return true;
240 } else {
241 return false;
242 }
243 }
244
245 // Check if 'option' matches 'name'. No "tail" is allowed.
246 static bool match_option(const JavaVMOption *option, const char* name) {
247 const char* tail = NULL;
248 bool result = match_option(option, name, &tail);
249 if (tail != NULL && *tail == '\0') {
250 return result;
251 } else {
252 return false;
253 }
254 }
255
256 // Return true if any of the strings in null-terminated array 'names' matches.
257 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
258 // the option must match exactly.
259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
260 bool tail_allowed) {
261 for (/* empty */; *names != NULL; ++names) {
262 if (match_option(option, *names, tail)) {
263 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
264 return true;
265 }
266 }
267 }
268 return false;
269 }
270
271 #if INCLUDE_JFR
272 static bool _has_jfr_option = false; // is using JFR
273
274 // return true on failure
275 static bool match_jfr_option(const JavaVMOption** option) {
276 assert((*option)->optionString != NULL, "invariant");
277 char* tail = NULL;
278 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_start_flight_recording_option(option, tail);
281 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
282 _has_jfr_option = true;
283 return Jfr::on_flight_recorder_option(option, tail);
284 }
285 return false;
286 }
287
288 bool Arguments::has_jfr_option() {
289 return _has_jfr_option;
290 }
291 #endif
292
293 static void logOption(const char* opt) {
294 if (PrintVMOptions) {
295 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
296 }
297 }
298
299 bool needs_module_property_warning = false;
300
301 #define MODULE_PROPERTY_PREFIX "jdk.module."
302 #define MODULE_PROPERTY_PREFIX_LEN 11
303 #define ADDEXPORTS "addexports"
304 #define ADDEXPORTS_LEN 10
305 #define ADDREADS "addreads"
306 #define ADDREADS_LEN 8
307 #define ADDOPENS "addopens"
308 #define ADDOPENS_LEN 8
309 #define PATCH "patch"
310 #define PATCH_LEN 5
311 #define ADDMODS "addmods"
312 #define ADDMODS_LEN 7
313 #define LIMITMODS "limitmods"
314 #define LIMITMODS_LEN 9
315 #define PATH "path"
316 #define PATH_LEN 4
317 #define UPGRADE_PATH "upgrade.path"
318 #define UPGRADE_PATH_LEN 12
319 #define ENABLE_NATIVE_ACCESS "enable.native.access"
320 #define ENABLE_NATIVE_ACCESS_LEN 20
321
322 void Arguments::add_init_library(const char* name, char* options) {
323 _libraryList.add(new AgentLibrary(name, options, false, NULL));
324 }
325
326 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
328 }
329
330 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
331 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
332 }
333
334 // Late-binding agents not started via arguments
335 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
336 _agentList.add(agentLib);
337 }
338
339 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
340 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
341 return ((strncmp(option, property, len) == 0) &&
342 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
343 }
344
345 // Return true if property starts with "jdk.module." and its ensuing chars match
346 // any of the reserved module properties.
347 // property should be passed without the leading "-D".
348 bool Arguments::is_internal_module_property(const char* property) {
349 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
350 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
351 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
353 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
354 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
355 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
357 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
358 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
359 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
360 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
361 return true;
362 }
363 }
364 return false;
365 }
366
367 // Process java launcher properties.
368 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
369 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
370 // Must do this before setting up other system properties,
371 // as some of them may depend on launcher type.
372 for (int index = 0; index < args->nOptions; index++) {
373 const JavaVMOption* option = args->options + index;
374 const char* tail;
375
376 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
377 process_java_launcher_argument(tail, option->extraInfo);
378 continue;
379 }
380 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
381 if (strcmp(tail, "true") == 0) {
382 _sun_java_launcher_is_altjvm = true;
383 }
384 continue;
385 }
386 }
387 }
388
389 // Initialize system properties key and value.
390 void Arguments::init_system_properties() {
391
392 // Set up _system_boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying system boot class path.
395 _system_boot_class_path = new PathString(NULL);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to NULL and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
410 _java_library_path = new SystemProperty("java.library.path", NULL, true);
411 _java_home = new SystemProperty("java.home", NULL, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429 }
430
431 // Update/Initialize System properties after JDK version number is known
432 void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446 }
447
448 /*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512 // the command-line as usual, but will issue a warning.
513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514 // the command-line, while issuing a warning and ignoring the flag value.
515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516 // existence of the flag.
517 //
518 // MANUAL CLEANUP ON JDK VERSION UPDATES:
519 // This table ensures that the handling of options will update automatically when the JDK
520 // version is incremented, but the source code needs to be cleanup up manually:
521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522 // variable should be removed, as well as users of the variable.
523 // - As "deprecated" options age into "obsolete" options, move the entry into the
524 // "Obsolete Flags" section of the table.
525 // - All expired options should be removed from the table.
526 static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
538 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
539 #ifdef PRODUCT
540 { "UseHeavyMonitors", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
541 #endif
542 { "ExtendedDTraceProbes", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
543 { "UseContainerCpuShares", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
544 { "PreferContainerQuotaForCPUCount", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
545 { "AliasLevel", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
546
547 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
548 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
549 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
551
552 // -------------- Obsolete Flags - sorted by expired_in --------------
553
554 { "FilterSpuriousWakeups", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
555 { "MinInliningThreshold", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) },
556 { "PrefetchFieldsAhead", JDK_Version::undefined(), JDK_Version::jdk(19), JDK_Version::jdk(20) },
557 #ifdef ASSERT
558 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
559 #endif
560
561 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
562 // These entries will generate build errors. Their purpose is to test the macros.
563 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
564 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
565 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
566 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
567 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
568 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
569 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
570 #endif
571
572 { NULL, JDK_Version(0), JDK_Version(0) }
573 };
574
575 // Flags that are aliases for other flags.
576 typedef struct {
577 const char* alias_name;
578 const char* real_name;
579 } AliasedFlag;
580
581 static AliasedFlag const aliased_jvm_flags[] = {
582 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
583 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
584 { NULL, NULL}
585 };
586
587 // Return true if "v" is less than "other", where "other" may be "undefined".
588 static bool version_less_than(JDK_Version v, JDK_Version other) {
589 assert(!v.is_undefined(), "must be defined");
590 if (!other.is_undefined() && v.compare(other) >= 0) {
591 return false;
592 } else {
593 return true;
594 }
595 }
596
597 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
598 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
599 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
600 flag = special_jvm_flags[i];
601 return true;
602 }
603 }
604 return false;
605 }
606
607 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
608 assert(version != NULL, "Must provide a version buffer");
609 SpecialFlag flag;
610 if (lookup_special_flag(flag_name, flag)) {
611 if (!flag.obsolete_in.is_undefined()) {
612 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
613 *version = flag.obsolete_in;
614 // This flag may have been marked for obsoletion in this version, but we may not
615 // have actually removed it yet. Rather than ignoring it as soon as we reach
616 // this version we allow some time for the removal to happen. So if the flag
617 // still actually exists we process it as normal, but issue an adjusted warning.
618 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
619 if (real_flag != NULL) {
620 char version_str[256];
621 version->to_string(version_str, sizeof(version_str));
622 warning("Temporarily processing option %s; support is scheduled for removal in %s",
623 flag_name, version_str);
624 return false;
625 }
626 return true;
627 }
628 }
629 }
630 return false;
631 }
632
633 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
634 assert(version != NULL, "Must provide a version buffer");
635 SpecialFlag flag;
636 if (lookup_special_flag(flag_name, flag)) {
637 if (!flag.deprecated_in.is_undefined()) {
638 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
639 version_less_than(JDK_Version::current(), flag.expired_in)) {
640 *version = flag.deprecated_in;
641 return 1;
642 } else {
643 return -1;
644 }
645 }
646 }
647 return 0;
648 }
649
650 const char* Arguments::real_flag_name(const char *flag_name) {
651 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
652 const AliasedFlag& flag_status = aliased_jvm_flags[i];
653 if (strcmp(flag_status.alias_name, flag_name) == 0) {
654 return flag_status.real_name;
655 }
656 }
657 return flag_name;
658 }
659
660 #ifdef ASSERT
661 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
662 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
663 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
664 return true;
665 }
666 }
667 return false;
668 }
669
670 // Verifies the correctness of the entries in the special_jvm_flags table.
671 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
672 // version being earlier than the deprecation version, then a warning is issued
673 // and verification fails - by returning false. If it is detected that the table
674 // is out of date, with respect to the current version, then ideally a warning is
675 // issued but verification does not fail. This allows the VM to operate when the
676 // version is first updated, without needing to update all the impacted flags at
677 // the same time. In practice we can't issue the warning immediately when the version
678 // is updated as it occurs for every test and some tests are not prepared to handle
679 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
680 // if the check_globals flag is true, and in addition allow a grace period and only
681 // check for stale flags when we hit build 25 (which is far enough into the 6 month
682 // release cycle that all flag updates should have been processed, whilst still
683 // leaving time to make the change before RDP2).
684 // We use a gtest to call this, passing true, so that we can detect stale flags before
685 // the end of the release cycle.
686
687 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
688
689 bool Arguments::verify_special_jvm_flags(bool check_globals) {
690 bool success = true;
691 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
692 const SpecialFlag& flag = special_jvm_flags[i];
693 if (lookup_special_flag(flag.name, i)) {
694 warning("Duplicate special flag declaration \"%s\"", flag.name);
695 success = false;
696 }
697 if (flag.deprecated_in.is_undefined() &&
698 flag.obsolete_in.is_undefined()) {
699 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
700 success = false;
701 }
702
703 if (!flag.deprecated_in.is_undefined()) {
704 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
705 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
706 success = false;
707 }
708
709 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
710 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
711 success = false;
712 }
713 }
714
715 if (!flag.obsolete_in.is_undefined()) {
716 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
717 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
718 success = false;
719 }
720
721 // if flag has become obsolete it should not have a "globals" flag defined anymore.
722 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
723 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
724 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
725 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
726 success = false;
727 }
728 }
729
730 } else if (!flag.expired_in.is_undefined()) {
731 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
732 success = false;
733 }
734
735 if (!flag.expired_in.is_undefined()) {
736 // if flag has become expired it should not have a "globals" flag defined anymore.
737 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
738 !version_less_than(JDK_Version::current(), flag.expired_in)) {
739 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
740 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
741 success = false;
742 }
743 }
744 }
745 }
746 return success;
747 }
748 #endif
749
750 template <typename T, ENABLE_IF(std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 4)> // signed 32-bit
751 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) {
752 // Don't use strtol -- on 64-bit builds, "long" could be either 32- or 64-bits
753 // so the range tests could be tautological and might cause compiler warnings.
754 STATIC_ASSERT(sizeof(long long) >= 8); // C++ specification
755 errno = 0; // errno is thread safe
756 long long v = strtoll(s, endptr, base);
757 if (errno != 0 || v < min_jint || v > max_jint) {
758 return false;
759 }
760 *result = static_cast<T>(v);
761 return true;
762 }
763
764 template <typename T, ENABLE_IF(!std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 4)> // unsigned 32-bit
765 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) {
766 if (s[0] == '-') {
767 return false;
768 }
769 // Don't use strtoul -- same reason as above.
770 STATIC_ASSERT(sizeof(unsigned long long) >= 8); // C++ specification
771 errno = 0; // errno is thread safe
772 unsigned long long v = strtoull(s, endptr, base);
773 if (errno != 0 || v > max_juint) {
774 return false;
775 }
776 *result = static_cast<T>(v);
777 return true;
778 }
779
780 template <typename T, ENABLE_IF(std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 8)> // signed 64-bit
781 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) {
782 errno = 0; // errno is thread safe
783 *result = strtoll(s, endptr, base);
784 return errno == 0;
785 }
786
787 template <typename T, ENABLE_IF(!std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 8)> // unsigned 64-bit
788 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) {
789 if (s[0] == '-') {
790 return false;
791 }
792 errno = 0; // errno is thread safe
793 *result = strtoull(s, endptr, base);
794 return errno == 0;
795 }
796
797 template<typename T>
798 static bool multiply_by_1k(T& n) {
799 if (n >= std::numeric_limits<T>::min() / 1024 &&
800 n <= std::numeric_limits<T>::max() / 1024) {
801 n *= 1024;
802 return true;
803 } else {
804 return false;
805 }
806 }
807
808 // All of the integral types that can be used for command line options:
809 // int, uint, intx, uintx, uint64_t, size_t
810 //
811 // In all supported platforms, these types can be mapped to only 4 native types:
812 // {signed, unsigned} x {32-bit, 64-bit}
813 //
814 // We use SFINAE to pick the correct parse_integer_impl() function
815 template<typename T>
816 static bool parse_integer(const char *s, T* result) {
817 if (!isdigit(s[0]) && s[0] != '-') {
818 // strtoll/strtoull may allow leading spaces. Forbid it.
819 return false;
820 }
821
822 T n = 0;
823 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) ||
824 (s[0] == '-' && s[1] == '0' && (s[2] == 'x' || s[3] == 'X'));
825 char* remainder;
826
827 if (!parse_integer_impl(s, &remainder, (is_hex ? 16 : 10), &n)) {
828 return false;
829 }
830
831 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
832 if (remainder == s || strlen(remainder) > 1) {
833 return false;
834 }
835
836 switch (*remainder) {
837 case 'T': case 't':
838 if (!multiply_by_1k(n)) return false;
839 // fall-through
840 case 'G': case 'g':
841 if (!multiply_by_1k(n)) return false;
842 // fall-through
843 case 'M': case 'm':
844 if (!multiply_by_1k(n)) return false;
845 // fall-through
846 case 'K': case 'k':
847 if (!multiply_by_1k(n)) return false;
848 break;
849 case '\0':
850 break;
851 default:
852 return false;
853 }
854
855 *result = n;
856 return true;
857 }
858
859 bool Arguments::atojulong(const char *s, julong* result) {
860 return parse_integer(s, result);
861 }
862
863 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
864 if (size < min_size) return arg_too_small;
865 if (size > max_size) return arg_too_big;
866 return arg_in_range;
867 }
868
869 // Describe an argument out of range error
870 void Arguments::describe_range_error(ArgsRange errcode) {
871 switch(errcode) {
872 case arg_too_big:
873 jio_fprintf(defaultStream::error_stream(),
874 "The specified size exceeds the maximum "
875 "representable size.\n");
876 break;
877 case arg_too_small:
878 case arg_unreadable:
879 case arg_in_range:
880 // do nothing for now
881 break;
882 default:
883 ShouldNotReachHere();
884 }
885 }
886
887 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
888 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
889 return true;
890 } else {
891 return false;
892 }
893 }
894
895 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
896 // strtod allows leading whitespace, but our flag format does not.
897 if (*value == '\0' || isspace(*value)) {
898 return false;
899 }
900 char* end;
901 errno = 0;
902 double v = strtod(value, &end);
903 if ((errno != 0) || (*end != 0)) {
904 return false;
905 }
906 if (g_isnan(v) || !g_isfinite(v)) {
907 // Currently we cannot handle these special values.
908 return false;
909 }
910
911 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
912 return true;
913 }
914 return false;
915 }
916
917 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
918 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
919
920 if (flag->is_int()) {
921 int v;
922 if (parse_integer(value, &v)) {
923 result = JVMFlagAccess::set_int(flag, &v, origin);
924 }
925 } else if (flag->is_uint()) {
926 uint v;
927 if (parse_integer(value, &v)) {
928 result = JVMFlagAccess::set_uint(flag, &v, origin);
929 }
930 } else if (flag->is_intx()) {
931 intx v;
932 if (parse_integer(value, &v)) {
933 result = JVMFlagAccess::set_intx(flag, &v, origin);
934 }
935 } else if (flag->is_uintx()) {
936 uintx v;
937 if (parse_integer(value, &v)) {
938 result = JVMFlagAccess::set_uintx(flag, &v, origin);
939 }
940 } else if (flag->is_uint64_t()) {
941 uint64_t v;
942 if (parse_integer(value, &v)) {
943 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
944 }
945 } else if (flag->is_size_t()) {
946 size_t v;
947 if (parse_integer(value, &v)) {
948 result = JVMFlagAccess::set_size_t(flag, &v, origin);
949 }
950 }
951
952 return result == JVMFlag::SUCCESS;
953 }
954
955 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
956 if (value[0] == '\0') {
957 value = NULL;
958 }
959 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
960 // Contract: JVMFlag always returns a pointer that needs freeing.
961 FREE_C_HEAP_ARRAY(char, value);
962 return true;
963 }
964
965 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
966 const char* old_value = "";
967 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
968 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
969 size_t new_len = strlen(new_value);
970 const char* value;
971 char* free_this_too = NULL;
972 if (old_len == 0) {
973 value = new_value;
974 } else if (new_len == 0) {
975 value = old_value;
976 } else {
977 size_t length = old_len + 1 + new_len + 1;
978 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
979 // each new setting adds another LINE to the switch:
980 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
981 value = buf;
982 free_this_too = buf;
983 }
984 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
985 // JVMFlag always returns a pointer that needs freeing.
986 FREE_C_HEAP_ARRAY(char, value);
987 // JVMFlag made its own copy, so I must delete my own temp. buffer.
988 FREE_C_HEAP_ARRAY(char, free_this_too);
989 return true;
990 }
991
992 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
993 const char* real_name = real_flag_name(arg);
994 JDK_Version since = JDK_Version();
995 switch (is_deprecated_flag(arg, &since)) {
996 case -1: {
997 // Obsolete or expired, so don't process normally,
998 // but allow for an obsolete flag we're still
999 // temporarily allowing.
1000 if (!is_obsolete_flag(arg, &since)) {
1001 return real_name;
1002 }
1003 // Note if we're not considered obsolete then we can't be expired either
1004 // as obsoletion must come first.
1005 return NULL;
1006 }
1007 case 0:
1008 return real_name;
1009 case 1: {
1010 char version[256];
1011 since.to_string(version, sizeof(version));
1012 if (real_name != arg) {
1013 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
1014 arg, version, real_name);
1015 } else {
1016 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1017 arg, version);
1018 }
1019 return real_name;
1020 }
1021 }
1022 ShouldNotReachHere();
1023 return NULL;
1024 }
1025
1026 #define BUFLEN 255
1027
1028 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
1029 char name_copied[BUFLEN+1];
1030 if (name[name_length] != 0) {
1031 if (name_length > BUFLEN) {
1032 return NULL;
1033 } else {
1034 strncpy(name_copied, name, name_length);
1035 name_copied[name_length] = '\0';
1036 name = name_copied;
1037 }
1038 }
1039
1040 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
1041 if (real_name == NULL) {
1042 return NULL;
1043 }
1044 JVMFlag* flag = JVMFlag::find_flag(real_name);
1045 return flag;
1046 }
1047
1048 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
1049 bool is_bool = false;
1050 bool bool_val = false;
1051 char c = *arg;
1052 if (c == '+' || c == '-') {
1053 is_bool = true;
1054 bool_val = (c == '+');
1055 arg++;
1056 }
1057
1058 const char* name = arg;
1059 while (true) {
1060 c = *arg;
1061 if (isalnum(c) || (c == '_')) {
1062 ++arg;
1063 } else {
1064 break;
1065 }
1066 }
1067
1068 size_t name_len = size_t(arg - name);
1069 if (name_len == 0) {
1070 return false;
1071 }
1072
1073 JVMFlag* flag = find_jvm_flag(name, name_len);
1074 if (flag == NULL) {
1075 return false;
1076 }
1077
1078 if (is_bool) {
1079 if (*arg != 0) {
1080 // Error -- extra characters such as -XX:+BoolFlag=123
1081 return false;
1082 }
1083 return set_bool_flag(flag, bool_val, origin);
1084 }
1085
1086 if (arg[0] == '=') {
1087 const char* value = arg + 1;
1088 if (flag->is_ccstr()) {
1089 if (flag->ccstr_accumulates()) {
1090 return append_to_string_flag(flag, value, origin);
1091 } else {
1092 return set_string_flag(flag, value, origin);
1093 }
1094 } else if (flag->is_double()) {
1095 return set_fp_numeric_flag(flag, value, origin);
1096 } else {
1097 return set_numeric_flag(flag, value, origin);
1098 }
1099 }
1100
1101 if (arg[0] == ':' && arg[1] == '=') {
1102 // -XX:Foo:=xxx will reset the string flag to the given value.
1103 const char* value = arg + 2;
1104 return set_string_flag(flag, value, origin);
1105 }
1106
1107 return false;
1108 }
1109
1110 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1111 assert(bldarray != NULL, "illegal argument");
1112
1113 if (arg == NULL) {
1114 return;
1115 }
1116
1117 int new_count = *count + 1;
1118
1119 // expand the array and add arg to the last element
1120 if (*bldarray == NULL) {
1121 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1122 } else {
1123 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1124 }
1125 (*bldarray)[*count] = os::strdup_check_oom(arg);
1126 *count = new_count;
1127 }
1128
1129 void Arguments::build_jvm_args(const char* arg) {
1130 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1131 }
1132
1133 void Arguments::build_jvm_flags(const char* arg) {
1134 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1135 }
1136
1137 // utility function to return a string that concatenates all
1138 // strings in a given char** array
1139 const char* Arguments::build_resource_string(char** args, int count) {
1140 if (args == NULL || count == 0) {
1141 return NULL;
1142 }
1143 size_t length = 0;
1144 for (int i = 0; i < count; i++) {
1145 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1146 }
1147 char* s = NEW_RESOURCE_ARRAY(char, length);
1148 char* dst = s;
1149 for (int j = 0; j < count; j++) {
1150 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1151 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1152 dst += offset;
1153 length -= offset;
1154 }
1155 return (const char*) s;
1156 }
1157
1158 void Arguments::print_on(outputStream* st) {
1159 st->print_cr("VM Arguments:");
1160 if (num_jvm_flags() > 0) {
1161 st->print("jvm_flags: "); print_jvm_flags_on(st);
1162 st->cr();
1163 }
1164 if (num_jvm_args() > 0) {
1165 st->print("jvm_args: "); print_jvm_args_on(st);
1166 st->cr();
1167 }
1168 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1169 if (_java_class_path != NULL) {
1170 char* path = _java_class_path->value();
1171 size_t len = strlen(path);
1172 st->print("java_class_path (initial): ");
1173 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1174 if (len == 0) {
1175 st->print_raw_cr("<not set>");
1176 } else {
1177 st->print_raw_cr(path, len);
1178 }
1179 }
1180 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1181 }
1182
1183 void Arguments::print_summary_on(outputStream* st) {
1184 // Print the command line. Environment variables that are helpful for
1185 // reproducing the problem are written later in the hs_err file.
1186 // flags are from setting file
1187 if (num_jvm_flags() > 0) {
1188 st->print_raw("Settings File: ");
1189 print_jvm_flags_on(st);
1190 st->cr();
1191 }
1192 // args are the command line and environment variable arguments.
1193 st->print_raw("Command Line: ");
1194 if (num_jvm_args() > 0) {
1195 print_jvm_args_on(st);
1196 }
1197 // this is the classfile and any arguments to the java program
1198 if (java_command() != NULL) {
1199 st->print("%s", java_command());
1200 }
1201 st->cr();
1202 }
1203
1204 void Arguments::print_jvm_flags_on(outputStream* st) {
1205 if (_num_jvm_flags > 0) {
1206 for (int i=0; i < _num_jvm_flags; i++) {
1207 st->print("%s ", _jvm_flags_array[i]);
1208 }
1209 }
1210 }
1211
1212 void Arguments::print_jvm_args_on(outputStream* st) {
1213 if (_num_jvm_args > 0) {
1214 for (int i=0; i < _num_jvm_args; i++) {
1215 st->print("%s ", _jvm_args_array[i]);
1216 }
1217 }
1218 }
1219
1220 bool Arguments::process_argument(const char* arg,
1221 jboolean ignore_unrecognized,
1222 JVMFlagOrigin origin) {
1223 JDK_Version since = JDK_Version();
1224
1225 if (parse_argument(arg, origin)) {
1226 return true;
1227 }
1228
1229 // Determine if the flag has '+', '-', or '=' characters.
1230 bool has_plus_minus = (*arg == '+' || *arg == '-');
1231 const char* const argname = has_plus_minus ? arg + 1 : arg;
1232
1233 size_t arg_len;
1234 const char* equal_sign = strchr(argname, '=');
1235 if (equal_sign == NULL) {
1236 arg_len = strlen(argname);
1237 } else {
1238 arg_len = equal_sign - argname;
1239 }
1240
1241 // Only make the obsolete check for valid arguments.
1242 if (arg_len <= BUFLEN) {
1243 // Construct a string which consists only of the argument name without '+', '-', or '='.
1244 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1245 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1246 if (is_obsolete_flag(stripped_argname, &since)) {
1247 char version[256];
1248 since.to_string(version, sizeof(version));
1249 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1250 return true;
1251 }
1252 }
1253
1254 // For locked flags, report a custom error message if available.
1255 // Otherwise, report the standard unrecognized VM option.
1256 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1257 if (found_flag != NULL) {
1258 char locked_message_buf[BUFLEN];
1259 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1260 if (strlen(locked_message_buf) == 0) {
1261 if (found_flag->is_bool() && !has_plus_minus) {
1262 jio_fprintf(defaultStream::error_stream(),
1263 "Missing +/- setting for VM option '%s'\n", argname);
1264 } else if (!found_flag->is_bool() && has_plus_minus) {
1265 jio_fprintf(defaultStream::error_stream(),
1266 "Unexpected +/- setting in VM option '%s'\n", argname);
1267 } else {
1268 jio_fprintf(defaultStream::error_stream(),
1269 "Improperly specified VM option '%s'\n", argname);
1270 }
1271 } else {
1272 #ifdef PRODUCT
1273 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1274 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1275 if (ignore_unrecognized && mismatched) {
1276 return true;
1277 }
1278 #endif
1279 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1280 }
1281 } else {
1282 if (ignore_unrecognized) {
1283 return true;
1284 }
1285 jio_fprintf(defaultStream::error_stream(),
1286 "Unrecognized VM option '%s'\n", argname);
1287 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1288 if (fuzzy_matched != NULL) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Did you mean '%s%s%s'? ",
1291 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1292 fuzzy_matched->name(),
1293 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1294 }
1295 }
1296
1297 // allow for commandline "commenting out" options like -XX:#+Verbose
1298 return arg[0] == '#';
1299 }
1300
1301 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1302 FILE* stream = os::fopen(file_name, "rb");
1303 if (stream == NULL) {
1304 if (should_exist) {
1305 jio_fprintf(defaultStream::error_stream(),
1306 "Could not open settings file %s\n", file_name);
1307 return false;
1308 } else {
1309 return true;
1310 }
1311 }
1312
1313 char token[1024];
1314 int pos = 0;
1315
1316 bool in_white_space = true;
1317 bool in_comment = false;
1318 bool in_quote = false;
1319 char quote_c = 0;
1320 bool result = true;
1321
1322 int c = getc(stream);
1323 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1324 if (in_white_space) {
1325 if (in_comment) {
1326 if (c == '\n') in_comment = false;
1327 } else {
1328 if (c == '#') in_comment = true;
1329 else if (!isspace(c)) {
1330 in_white_space = false;
1331 token[pos++] = c;
1332 }
1333 }
1334 } else {
1335 if (c == '\n' || (!in_quote && isspace(c))) {
1336 // token ends at newline, or at unquoted whitespace
1337 // this allows a way to include spaces in string-valued options
1338 token[pos] = '\0';
1339 logOption(token);
1340 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1341 build_jvm_flags(token);
1342 pos = 0;
1343 in_white_space = true;
1344 in_quote = false;
1345 } else if (!in_quote && (c == '\'' || c == '"')) {
1346 in_quote = true;
1347 quote_c = c;
1348 } else if (in_quote && (c == quote_c)) {
1349 in_quote = false;
1350 } else {
1351 token[pos++] = c;
1352 }
1353 }
1354 c = getc(stream);
1355 }
1356 if (pos > 0) {
1357 token[pos] = '\0';
1358 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1359 build_jvm_flags(token);
1360 }
1361 fclose(stream);
1362 return result;
1363 }
1364
1365 //=============================================================================================================
1366 // Parsing of properties (-D)
1367
1368 const char* Arguments::get_property(const char* key) {
1369 return PropertyList_get_value(system_properties(), key);
1370 }
1371
1372 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1373 const char* eq = strchr(prop, '=');
1374 const char* key;
1375 const char* value = "";
1376
1377 if (eq == NULL) {
1378 // property doesn't have a value, thus use passed string
1379 key = prop;
1380 } else {
1381 // property have a value, thus extract it and save to the
1382 // allocated string
1383 size_t key_len = eq - prop;
1384 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1385
1386 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1387 key = tmp_key;
1388
1389 value = &prop[key_len + 1];
1390 }
1391
1392 #if INCLUDE_CDS
1393 if (is_internal_module_property(key) ||
1394 strcmp(key, "jdk.module.main") == 0) {
1395 MetaspaceShared::disable_optimized_module_handling();
1396 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1397 }
1398 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1399 strcmp(key, "jdk.module.validation") == 0 ||
1400 strcmp(key, "java.system.class.loader") == 0) {
1401 MetaspaceShared::disable_full_module_graph();
1402 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1403 }
1404 #endif
1405
1406 if (strcmp(key, "java.compiler") == 0) {
1407 process_java_compiler_argument(value);
1408 // Record value in Arguments, but let it get passed to Java.
1409 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1410 // sun.java.launcher.is_altjvm property is
1411 // private and is processed in process_sun_java_launcher_properties();
1412 // the sun.java.launcher property is passed on to the java application
1413 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1414 // append is true, writable is true, internal is false
1415 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1416 WriteableProperty, ExternalProperty);
1417 } else {
1418 if (strcmp(key, "sun.java.command") == 0) {
1419 char *old_java_command = _java_command;
1420 _java_command = os::strdup_check_oom(value, mtArguments);
1421 if (old_java_command != NULL) {
1422 os::free(old_java_command);
1423 }
1424 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1425 // If this property is set on the command line then its value will be
1426 // displayed in VM error logs as the URL at which to submit such logs.
1427 // Normally the URL displayed in error logs is different from the value
1428 // of this system property, so a different property should have been
1429 // used here, but we leave this as-is in case someone depends upon it.
1430 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1431 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1432 // its value without going through the property list or making a Java call.
1433 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1434 if (old_java_vendor_url_bug != NULL) {
1435 os::free((void *)old_java_vendor_url_bug);
1436 }
1437 }
1438
1439 // Create new property and add at the end of the list
1440 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1441 }
1442
1443 if (key != prop) {
1444 // SystemProperty copy passed value, thus free previously allocated
1445 // memory
1446 FreeHeap((void *)key);
1447 }
1448
1449 return true;
1450 }
1451
1452 #if INCLUDE_CDS
1453 const char* unsupported_properties[] = { "jdk.module.limitmods",
1454 "jdk.module.upgrade.path",
1455 "jdk.module.patch.0" };
1456 const char* unsupported_options[] = { "--limit-modules",
1457 "--upgrade-module-path",
1458 "--patch-module"
1459 };
1460 void Arguments::check_unsupported_dumping_properties() {
1461 assert(is_dumping_archive(),
1462 "this function is only used with CDS dump time");
1463 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1464 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1465 SystemProperty* sp = system_properties();
1466 while (sp != NULL) {
1467 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1468 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1469 vm_exit_during_initialization(
1470 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1471 }
1472 }
1473 sp = sp->next();
1474 }
1475
1476 // Check for an exploded module build in use with -Xshare:dump.
1477 if (!has_jimage()) {
1478 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1479 }
1480 }
1481
1482 bool Arguments::check_unsupported_cds_runtime_properties() {
1483 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1484 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1485 if (ArchiveClassesAtExit != NULL) {
1486 // dynamic dumping, just return false for now.
1487 // check_unsupported_dumping_properties() will be called later to check the same set of
1488 // properties, and will exit the VM with the correct error message if the unsupported properties
1489 // are used.
1490 return false;
1491 }
1492 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1493 if (get_property(unsupported_properties[i]) != NULL) {
1494 if (RequireSharedSpaces) {
1495 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1496 } else {
1497 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1498 }
1499 return true;
1500 }
1501 }
1502 return false;
1503 }
1504 #endif
1505
1506 //===========================================================================================================
1507 // Setting int/mixed/comp mode flags
1508
1509 void Arguments::set_mode_flags(Mode mode) {
1510 // Set up default values for all flags.
1511 // If you add a flag to any of the branches below,
1512 // add a default value for it here.
1513 set_java_compiler(false);
1514 _mode = mode;
1515
1516 // Ensure Agent_OnLoad has the correct initial values.
1517 // This may not be the final mode; mode may change later in onload phase.
1518 PropertyList_unique_add(&_system_properties, "java.vm.info",
1519 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1520
1521 UseInterpreter = true;
1522 UseCompiler = true;
1523 UseLoopCounter = true;
1524
1525 // Default values may be platform/compiler dependent -
1526 // use the saved values
1527 ClipInlining = Arguments::_ClipInlining;
1528 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1529 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1530 BackgroundCompilation = Arguments::_BackgroundCompilation;
1531
1532 // Change from defaults based on mode
1533 switch (mode) {
1534 default:
1535 ShouldNotReachHere();
1536 break;
1537 case _int:
1538 UseCompiler = false;
1539 UseLoopCounter = false;
1540 AlwaysCompileLoopMethods = false;
1541 UseOnStackReplacement = false;
1542 break;
1543 case _mixed:
1544 // same as default
1545 break;
1546 case _comp:
1547 UseInterpreter = false;
1548 BackgroundCompilation = false;
1549 ClipInlining = false;
1550 break;
1551 }
1552 }
1553
1554 // Conflict: required to use shared spaces (-Xshare:on), but
1555 // incompatible command line options were chosen.
1556 static void no_shared_spaces(const char* message) {
1557 if (RequireSharedSpaces) {
1558 jio_fprintf(defaultStream::error_stream(),
1559 "Class data sharing is inconsistent with other specified options.\n");
1560 vm_exit_during_initialization("Unable to use shared archive", message);
1561 } else {
1562 log_info(cds)("Unable to use shared archive: %s", message);
1563 UseSharedSpaces = false;
1564 }
1565 }
1566
1567 void set_object_alignment() {
1568 // Object alignment.
1569 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1570 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1571 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1572 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1573 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1574 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1575
1576 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1577 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1578
1579 // Oop encoding heap max
1580 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1581 }
1582
1583 size_t Arguments::max_heap_for_compressed_oops() {
1584 // Avoid sign flip.
1585 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1586 // We need to fit both the NULL page and the heap into the memory budget, while
1587 // keeping alignment constraints of the heap. To guarantee the latter, as the
1588 // NULL page is located before the heap, we pad the NULL page to the conservative
1589 // maximum alignment that the GC may ever impose upon the heap.
1590 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1591 _conservative_max_heap_alignment);
1592
1593 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1594 NOT_LP64(ShouldNotReachHere(); return 0);
1595 }
1596
1597 void Arguments::set_use_compressed_oops() {
1598 #ifdef _LP64
1599 // MaxHeapSize is not set up properly at this point, but
1600 // the only value that can override MaxHeapSize if we are
1601 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1602 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1603
1604 if (max_heap_size <= max_heap_for_compressed_oops()) {
1605 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1606 FLAG_SET_ERGO(UseCompressedOops, true);
1607 }
1608 } else {
1609 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1610 warning("Max heap size too large for Compressed Oops");
1611 FLAG_SET_DEFAULT(UseCompressedOops, false);
1612 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1613 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1614 }
1615 }
1616 }
1617 #endif // _LP64
1618 }
1619
1620
1621 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1622 // set_use_compressed_oops().
1623 void Arguments::set_use_compressed_klass_ptrs() {
1624 #ifdef _LP64
1625 // On some architectures, the use of UseCompressedClassPointers implies the use of
1626 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1627 // is reused to perform some optimized spilling, in order to use rheap_base as a
1628 // temp register. But by treating it as any other temp register, spilling can typically
1629 // be completely avoided instead. So it is better not to perform this trick. And by
1630 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1631 // can still use compressed class pointers.
1632 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1633 if (UseCompressedClassPointers) {
1634 warning("UseCompressedClassPointers requires UseCompressedOops");
1635 }
1636 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1637 } else {
1638 // Turn on UseCompressedClassPointers too
1639 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1640 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1641 }
1642 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1643 if (UseCompressedClassPointers) {
1644 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1645 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1646 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1647 }
1648 }
1649 }
1650 #endif // _LP64
1651 }
1652
1653 void Arguments::set_conservative_max_heap_alignment() {
1654 // The conservative maximum required alignment for the heap is the maximum of
1655 // the alignments imposed by several sources: any requirements from the heap
1656 // itself and the maximum page size we may run the VM with.
1657 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1658 _conservative_max_heap_alignment = MAX4(heap_alignment,
1659 (size_t)os::vm_allocation_granularity(),
1660 os::max_page_size(),
1661 GCArguments::compute_heap_alignment());
1662 }
1663
1664 jint Arguments::set_ergonomics_flags() {
1665 GCConfig::initialize();
1666
1667 set_conservative_max_heap_alignment();
1668
1669 #ifdef _LP64
1670 set_use_compressed_oops();
1671
1672 // set_use_compressed_klass_ptrs() must be called after calling
1673 // set_use_compressed_oops().
1674 set_use_compressed_klass_ptrs();
1675
1676 // Also checks that certain machines are slower with compressed oops
1677 // in vm_version initialization code.
1678 #endif // _LP64
1679
1680 return JNI_OK;
1681 }
1682
1683 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1684 size_t max_allocatable;
1685 size_t result = limit;
1686 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1687 // The AggressiveHeap check is a temporary workaround to avoid calling
1688 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1689 // selected. This works because AggressiveHeap implies UseParallelGC
1690 // where we know the ratio will be 1. Once the AggressiveHeap option is
1691 // removed, this can be cleaned up.
1692 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1693 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1694 result = MIN2(result, max_allocatable / fraction);
1695 }
1696 return result;
1697 }
1698
1699 // Use static initialization to get the default before parsing
1700 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1701
1702 void Arguments::set_heap_size() {
1703 julong phys_mem;
1704
1705 // If the user specified one of these options, they
1706 // want specific memory sizing so do not limit memory
1707 // based on compressed oops addressability.
1708 // Also, memory limits will be calculated based on
1709 // available os physical memory, not our MaxRAM limit,
1710 // unless MaxRAM is also specified.
1711 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1712 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1713 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1714 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1715 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1716 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1717 !FLAG_IS_DEFAULT(MaxRAM));
1718 if (override_coop_limit) {
1719 if (FLAG_IS_DEFAULT(MaxRAM)) {
1720 phys_mem = os::physical_memory();
1721 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1722 } else {
1723 phys_mem = (julong)MaxRAM;
1724 }
1725 } else {
1726 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1727 : (julong)MaxRAM;
1728 }
1729
1730
1731 // Convert deprecated flags
1732 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1733 !FLAG_IS_DEFAULT(MaxRAMFraction))
1734 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1735
1736 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1737 !FLAG_IS_DEFAULT(MinRAMFraction))
1738 MinRAMPercentage = 100.0 / MinRAMFraction;
1739
1740 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1741 !FLAG_IS_DEFAULT(InitialRAMFraction))
1742 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1743
1744 // If the maximum heap size has not been set with -Xmx,
1745 // then set it as fraction of the size of physical memory,
1746 // respecting the maximum and minimum sizes of the heap.
1747 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1748 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1749 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1750 if (reasonable_min < MaxHeapSize) {
1751 // Small physical memory, so use a minimum fraction of it for the heap
1752 reasonable_max = reasonable_min;
1753 } else {
1754 // Not-small physical memory, so require a heap at least
1755 // as large as MaxHeapSize
1756 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1757 }
1758
1759 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1760 // Limit the heap size to ErgoHeapSizeLimit
1761 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1762 }
1763
1764 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1765
1766 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1767 // An initial heap size was specified on the command line,
1768 // so be sure that the maximum size is consistent. Done
1769 // after call to limit_heap_by_allocatable_memory because that
1770 // method might reduce the allocation size.
1771 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1772 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1773 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1774 }
1775
1776 #ifdef _LP64
1777 if (UseCompressedOops || UseCompressedClassPointers) {
1778 // HeapBaseMinAddress can be greater than default but not less than.
1779 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1780 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1781 // matches compressed oops printing flags
1782 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1783 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1784 DefaultHeapBaseMinAddress,
1785 DefaultHeapBaseMinAddress/G,
1786 HeapBaseMinAddress);
1787 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1788 }
1789 }
1790 }
1791 if (UseCompressedOops) {
1792 // Limit the heap size to the maximum possible when using compressed oops
1793 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1794
1795 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1796 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1797 // but it should be not less than default MaxHeapSize.
1798 max_coop_heap -= HeapBaseMinAddress;
1799 }
1800
1801 // If user specified flags prioritizing os physical
1802 // memory limits, then disable compressed oops if
1803 // limits exceed max_coop_heap and UseCompressedOops
1804 // was not specified.
1805 if (reasonable_max > max_coop_heap) {
1806 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1807 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1808 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1809 "Please check the setting of MaxRAMPercentage %5.2f."
1810 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1811 FLAG_SET_ERGO(UseCompressedOops, false);
1812 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1813 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1814 }
1815 } else {
1816 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1817 }
1818 }
1819 }
1820 #endif // _LP64
1821
1822 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1823 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1824 }
1825
1826 // If the minimum or initial heap_size have not been set or requested to be set
1827 // ergonomically, set them accordingly.
1828 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1829 julong reasonable_minimum = (julong)(OldSize + NewSize);
1830
1831 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1832
1833 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1834
1835 if (InitialHeapSize == 0) {
1836 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1837 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1838
1839 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1840 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1841
1842 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1843 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1844 }
1845 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1846 // synchronize with InitialHeapSize to avoid errors with the default value.
1847 if (MinHeapSize == 0) {
1848 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1849 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1850 }
1851 }
1852 }
1853
1854 // This option inspects the machine and attempts to set various
1855 // parameters to be optimal for long-running, memory allocation
1856 // intensive jobs. It is intended for machines with large
1857 // amounts of cpu and memory.
1858 jint Arguments::set_aggressive_heap_flags() {
1859 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1860 // VM, but we may not be able to represent the total physical memory
1861 // available (like having 8gb of memory on a box but using a 32bit VM).
1862 // Thus, we need to make sure we're using a julong for intermediate
1863 // calculations.
1864 julong initHeapSize;
1865 julong total_memory = os::physical_memory();
1866
1867 if (total_memory < (julong) 256 * M) {
1868 jio_fprintf(defaultStream::error_stream(),
1869 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1870 vm_exit(1);
1871 }
1872
1873 // The heap size is half of available memory, or (at most)
1874 // all of possible memory less 160mb (leaving room for the OS
1875 // when using ISM). This is the maximum; because adaptive sizing
1876 // is turned on below, the actual space used may be smaller.
1877
1878 initHeapSize = MIN2(total_memory / (julong) 2,
1879 total_memory - (julong) 160 * M);
1880
1881 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1882
1883 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1884 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1885 return JNI_EINVAL;
1886 }
1887 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1888 return JNI_EINVAL;
1889 }
1890 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1891 return JNI_EINVAL;
1892 }
1893 }
1894 if (FLAG_IS_DEFAULT(NewSize)) {
1895 // Make the young generation 3/8ths of the total heap.
1896 if (FLAG_SET_CMDLINE(NewSize,
1897 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1898 return JNI_EINVAL;
1899 }
1900 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903 }
1904
1905 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1906 FLAG_SET_DEFAULT(UseLargePages, true);
1907 #endif
1908
1909 // Increase some data structure sizes for efficiency
1910 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1911 return JNI_EINVAL;
1912 }
1913 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1914 return JNI_EINVAL;
1915 }
1916 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1917 return JNI_EINVAL;
1918 }
1919
1920 // See the OldPLABSize comment below, but replace 'after promotion'
1921 // with 'after copying'. YoungPLABSize is the size of the survivor
1922 // space per-gc-thread buffers. The default is 4kw.
1923 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1924 return JNI_EINVAL;
1925 }
1926
1927 // OldPLABSize is the size of the buffers in the old gen that
1928 // UseParallelGC uses to promote live data that doesn't fit in the
1929 // survivor spaces. At any given time, there's one for each gc thread.
1930 // The default size is 1kw. These buffers are rarely used, since the
1931 // survivor spaces are usually big enough. For specjbb, however, there
1932 // are occasions when there's lots of live data in the young gen
1933 // and we end up promoting some of it. We don't have a definite
1934 // explanation for why bumping OldPLABSize helps, but the theory
1935 // is that a bigger PLAB results in retaining something like the
1936 // original allocation order after promotion, which improves mutator
1937 // locality. A minor effect may be that larger PLABs reduce the
1938 // number of PLAB allocation events during gc. The value of 8kw
1939 // was arrived at by experimenting with specjbb.
1940 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1941 return JNI_EINVAL;
1942 }
1943
1944 // Enable parallel GC and adaptive generation sizing
1945 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1946 return JNI_EINVAL;
1947 }
1948
1949 // Encourage steady state memory management
1950 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1951 return JNI_EINVAL;
1952 }
1953
1954 // This appears to improve mutator locality
1955 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1956 return JNI_EINVAL;
1957 }
1958
1959 return JNI_OK;
1960 }
1961
1962 // This must be called after ergonomics.
1963 void Arguments::set_bytecode_flags() {
1964 if (!RewriteBytecodes) {
1965 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1966 }
1967 }
1968
1969 // Aggressive optimization flags
1970 jint Arguments::set_aggressive_opts_flags() {
1971 #ifdef COMPILER2
1972 if (AggressiveUnboxing) {
1973 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1974 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1975 } else if (!EliminateAutoBox) {
1976 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1977 AggressiveUnboxing = false;
1978 }
1979 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1980 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1981 } else if (!DoEscapeAnalysis) {
1982 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1983 AggressiveUnboxing = false;
1984 }
1985 }
1986 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1987 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1988 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1989 }
1990 // Feed the cache size setting into the JDK
1991 char buffer[1024];
1992 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1993 if (!add_property(buffer)) {
1994 return JNI_ENOMEM;
1995 }
1996 }
1997 #endif
1998
1999 return JNI_OK;
2000 }
2001
2002 //===========================================================================================================
2003 // Parsing of java.compiler property
2004
2005 void Arguments::process_java_compiler_argument(const char* arg) {
2006 // For backwards compatibility, Djava.compiler=NONE or ""
2007 // causes us to switch to -Xint mode UNLESS -Xdebug
2008 // is also specified.
2009 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2010 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2011 }
2012 }
2013
2014 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2015 _sun_java_launcher = os::strdup_check_oom(launcher);
2016 }
2017
2018 bool Arguments::created_by_java_launcher() {
2019 assert(_sun_java_launcher != NULL, "property must have value");
2020 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2021 }
2022
2023 bool Arguments::sun_java_launcher_is_altjvm() {
2024 return _sun_java_launcher_is_altjvm;
2025 }
2026
2027 //===========================================================================================================
2028 // Parsing of main arguments
2029
2030 unsigned int addreads_count = 0;
2031 unsigned int addexports_count = 0;
2032 unsigned int addopens_count = 0;
2033 unsigned int addmods_count = 0;
2034 unsigned int patch_mod_count = 0;
2035 unsigned int enable_native_access_count = 0;
2036
2037 // Check the consistency of vm_init_args
2038 bool Arguments::check_vm_args_consistency() {
2039 // Method for adding checks for flag consistency.
2040 // The intent is to warn the user of all possible conflicts,
2041 // before returning an error.
2042 // Note: Needs platform-dependent factoring.
2043 bool status = true;
2044
2045 if (TLABRefillWasteFraction == 0) {
2046 jio_fprintf(defaultStream::error_stream(),
2047 "TLABRefillWasteFraction should be a denominator, "
2048 "not " SIZE_FORMAT "\n",
2049 TLABRefillWasteFraction);
2050 status = false;
2051 }
2052
2053 status = CompilerConfig::check_args_consistency(status);
2054 #if INCLUDE_JVMCI
2055 if (status && EnableJVMCI) {
2056 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2057 AddProperty, UnwriteableProperty, InternalProperty);
2058 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2059 return false;
2060 }
2061 }
2062 #endif
2063
2064 #ifndef SUPPORT_RESERVED_STACK_AREA
2065 if (StackReservedPages != 0) {
2066 FLAG_SET_CMDLINE(StackReservedPages, 0);
2067 warning("Reserved Stack Area not supported on this platform");
2068 }
2069 #endif
2070
2071 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64)
2072 if (UseHeavyMonitors) {
2073 jio_fprintf(defaultStream::error_stream(),
2074 "UseHeavyMonitors is not fully implemented on this architecture");
2075 return false;
2076 }
2077 #endif
2078 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
2079 if (UseHeavyMonitors && UseRTMForStackLocks) {
2080 jio_fprintf(defaultStream::error_stream(),
2081 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive");
2082
2083 return false;
2084 }
2085 #endif
2086 if (VerifyHeavyMonitors && !UseHeavyMonitors) {
2087 jio_fprintf(defaultStream::error_stream(),
2088 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors");
2089 return false;
2090 }
2091
2092 return status;
2093 }
2094
2095 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2096 const char* option_type) {
2097 if (ignore) return false;
2098
2099 const char* spacer = " ";
2100 if (option_type == NULL) {
2101 option_type = ++spacer; // Set both to the empty string.
2102 }
2103
2104 jio_fprintf(defaultStream::error_stream(),
2105 "Unrecognized %s%soption: %s\n", option_type, spacer,
2106 option->optionString);
2107 return true;
2108 }
2109
2110 static const char* user_assertion_options[] = {
2111 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2112 };
2113
2114 static const char* system_assertion_options[] = {
2115 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2116 };
2117
2118 bool Arguments::parse_uintx(const char* value,
2119 uintx* uintx_arg,
2120 uintx min_size) {
2121 uintx n;
2122 if (!parse_integer(value, &n)) {
2123 return false;
2124 }
2125 if (n >= min_size) {
2126 *uintx_arg = n;
2127 return true;
2128 } else {
2129 return false;
2130 }
2131 }
2132
2133 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2134 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2135 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2136 char* property = AllocateHeap(prop_len, mtArguments);
2137 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2138 if (ret < 0 || ret >= (int)prop_len) {
2139 FreeHeap(property);
2140 return false;
2141 }
2142 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2143 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2144 // that multiple occurrences of the associated flag just causes the existing property value to be
2145 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2146 // to a property after we have finished flag processing.
2147 bool added = add_property(property, WriteableProperty, internal);
2148 FreeHeap(property);
2149 return added;
2150 }
2151
2152 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2153 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2154 const unsigned int props_count_limit = 1000;
2155 const int max_digits = 3;
2156 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2157
2158 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2159 if (count < props_count_limit) {
2160 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2161 char* property = AllocateHeap(prop_len, mtArguments);
2162 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2163 if (ret < 0 || ret >= (int)prop_len) {
2164 FreeHeap(property);
2165 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2166 return false;
2167 }
2168 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2169 FreeHeap(property);
2170 return added;
2171 }
2172
2173 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2174 return false;
2175 }
2176
2177 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2178 julong* long_arg,
2179 julong min_size,
2180 julong max_size) {
2181 if (!parse_integer(s, long_arg)) return arg_unreadable;
2182 return check_memory_size(*long_arg, min_size, max_size);
2183 }
2184
2185 // Parse JavaVMInitArgs structure
2186
2187 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2188 const JavaVMInitArgs *java_tool_options_args,
2189 const JavaVMInitArgs *java_options_args,
2190 const JavaVMInitArgs *cmd_line_args) {
2191 bool patch_mod_javabase = false;
2192
2193 // Save default settings for some mode flags
2194 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2195 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2196 Arguments::_ClipInlining = ClipInlining;
2197 Arguments::_BackgroundCompilation = BackgroundCompilation;
2198
2199 // Remember the default value of SharedBaseAddress.
2200 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2201
2202 // Setup flags for mixed which is the default
2203 set_mode_flags(_mixed);
2204
2205 // Parse args structure generated from java.base vm options resource
2206 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2207 if (result != JNI_OK) {
2208 return result;
2209 }
2210
2211 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2212 // variable (if present).
2213 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2214 if (result != JNI_OK) {
2215 return result;
2216 }
2217
2218 // Parse args structure generated from the command line flags.
2219 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2220 if (result != JNI_OK) {
2221 return result;
2222 }
2223
2224 // Parse args structure generated from the _JAVA_OPTIONS environment
2225 // variable (if present) (mimics classic VM)
2226 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2227 if (result != JNI_OK) {
2228 return result;
2229 }
2230
2231 // We need to ensure processor and memory resources have been properly
2232 // configured - which may rely on arguments we just processed - before
2233 // doing the final argument processing. Any argument processing that
2234 // needs to know about processor and memory resources must occur after
2235 // this point.
2236
2237 os::init_container_support();
2238
2239 // Do final processing now that all arguments have been parsed
2240 result = finalize_vm_init_args(patch_mod_javabase);
2241 if (result != JNI_OK) {
2242 return result;
2243 }
2244
2245 return JNI_OK;
2246 }
2247
2248 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2249 // represents a valid JDWP agent. is_path==true denotes that we
2250 // are dealing with -agentpath (case where name is a path), otherwise with
2251 // -agentlib
2252 bool valid_jdwp_agent(char *name, bool is_path) {
2253 char *_name;
2254 const char *_jdwp = "jdwp";
2255 size_t _len_jdwp, _len_prefix;
2256
2257 if (is_path) {
2258 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2259 return false;
2260 }
2261
2262 _name++; // skip past last path separator
2263 _len_prefix = strlen(JNI_LIB_PREFIX);
2264
2265 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2266 return false;
2267 }
2268
2269 _name += _len_prefix;
2270 _len_jdwp = strlen(_jdwp);
2271
2272 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2273 _name += _len_jdwp;
2274 }
2275 else {
2276 return false;
2277 }
2278
2279 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2280 return false;
2281 }
2282
2283 return true;
2284 }
2285
2286 if (strcmp(name, _jdwp) == 0) {
2287 return true;
2288 }
2289
2290 return false;
2291 }
2292
2293 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2294 // --patch-module=<module>=<file>(<pathsep><file>)*
2295 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2296 // Find the equal sign between the module name and the path specification
2297 const char* module_equal = strchr(patch_mod_tail, '=');
2298 if (module_equal == NULL) {
2299 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2300 return JNI_ERR;
2301 } else {
2302 // Pick out the module name
2303 size_t module_len = module_equal - patch_mod_tail;
2304 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2305 if (module_name != NULL) {
2306 memcpy(module_name, patch_mod_tail, module_len);
2307 *(module_name + module_len) = '\0';
2308 // The path piece begins one past the module_equal sign
2309 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2310 FREE_C_HEAP_ARRAY(char, module_name);
2311 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2312 return JNI_ENOMEM;
2313 }
2314 } else {
2315 return JNI_ENOMEM;
2316 }
2317 }
2318 return JNI_OK;
2319 }
2320
2321 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2322 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2323 // The min and max sizes match the values in globals.hpp, but scaled
2324 // with K. The values have been chosen so that alignment with page
2325 // size doesn't change the max value, which makes the conversions
2326 // back and forth between Xss value and ThreadStackSize value easier.
2327 // The values have also been chosen to fit inside a 32-bit signed type.
2328 const julong min_ThreadStackSize = 0;
2329 const julong max_ThreadStackSize = 1 * M;
2330
2331 // Make sure the above values match the range set in globals.hpp
2332 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2333 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2334 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2335
2336 const julong min_size = min_ThreadStackSize * K;
2337 const julong max_size = max_ThreadStackSize * K;
2338
2339 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2340
2341 julong size = 0;
2342 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2343 if (errcode != arg_in_range) {
2344 bool silent = (option == NULL); // Allow testing to silence error messages
2345 if (!silent) {
2346 jio_fprintf(defaultStream::error_stream(),
2347 "Invalid thread stack size: %s\n", option->optionString);
2348 describe_range_error(errcode);
2349 }
2350 return JNI_EINVAL;
2351 }
2352
2353 // Internally track ThreadStackSize in units of 1024 bytes.
2354 const julong size_aligned = align_up(size, K);
2355 assert(size <= size_aligned,
2356 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2357 size, size_aligned);
2358
2359 const julong size_in_K = size_aligned / K;
2360 assert(size_in_K < (julong)max_intx,
2361 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2362 size_in_K);
2363
2364 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2365 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2366 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2367 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2368 max_expanded, size_in_K);
2369
2370 *out_ThreadStackSize = (intx)size_in_K;
2371
2372 return JNI_OK;
2373 }
2374
2375 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2376 // For match_option to return remaining or value part of option string
2377 const char* tail;
2378
2379 // iterate over arguments
2380 for (int index = 0; index < args->nOptions; index++) {
2381 bool is_absolute_path = false; // for -agentpath vs -agentlib
2382
2383 const JavaVMOption* option = args->options + index;
2384
2385 if (!match_option(option, "-Djava.class.path", &tail) &&
2386 !match_option(option, "-Dsun.java.command", &tail) &&
2387 !match_option(option, "-Dsun.java.launcher", &tail)) {
2388
2389 // add all jvm options to the jvm_args string. This string
2390 // is used later to set the java.vm.args PerfData string constant.
2391 // the -Djava.class.path and the -Dsun.java.command options are
2392 // omitted from jvm_args string as each have their own PerfData
2393 // string constant object.
2394 build_jvm_args(option->optionString);
2395 }
2396
2397 // -verbose:[class/module/gc/jni]
2398 if (match_option(option, "-verbose", &tail)) {
2399 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2400 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2401 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2402 } else if (!strcmp(tail, ":module")) {
2403 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2404 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2405 } else if (!strcmp(tail, ":gc")) {
2406 if (_legacyGCLogging.lastFlag == 0) {
2407 _legacyGCLogging.lastFlag = 1;
2408 }
2409 } else if (!strcmp(tail, ":jni")) {
2410 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2411 }
2412 // -da / -ea / -disableassertions / -enableassertions
2413 // These accept an optional class/package name separated by a colon, e.g.,
2414 // -da:java.lang.Thread.
2415 } else if (match_option(option, user_assertion_options, &tail, true)) {
2416 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2417 if (*tail == '\0') {
2418 JavaAssertions::setUserClassDefault(enable);
2419 } else {
2420 assert(*tail == ':', "bogus match by match_option()");
2421 JavaAssertions::addOption(tail + 1, enable);
2422 }
2423 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2424 } else if (match_option(option, system_assertion_options, &tail, false)) {
2425 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2426 JavaAssertions::setSystemClassDefault(enable);
2427 // -bootclasspath:
2428 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2429 jio_fprintf(defaultStream::output_stream(),
2430 "-Xbootclasspath is no longer a supported option.\n");
2431 return JNI_EINVAL;
2432 // -bootclasspath/a:
2433 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2434 Arguments::append_sysclasspath(tail);
2435 #if INCLUDE_CDS
2436 MetaspaceShared::disable_optimized_module_handling();
2437 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2438 #endif
2439 // -bootclasspath/p:
2440 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2441 jio_fprintf(defaultStream::output_stream(),
2442 "-Xbootclasspath/p is no longer a supported option.\n");
2443 return JNI_EINVAL;
2444 // -Xrun
2445 } else if (match_option(option, "-Xrun", &tail)) {
2446 if (tail != NULL) {
2447 const char* pos = strchr(tail, ':');
2448 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2449 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2450 jio_snprintf(name, len + 1, "%s", tail);
2451
2452 char *options = NULL;
2453 if(pos != NULL) {
2454 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2455 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2456 }
2457 #if !INCLUDE_JVMTI
2458 if (strcmp(name, "jdwp") == 0) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Debugging agents are not supported in this VM\n");
2461 return JNI_ERR;
2462 }
2463 #endif // !INCLUDE_JVMTI
2464 add_init_library(name, options);
2465 }
2466 } else if (match_option(option, "--add-reads=", &tail)) {
2467 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2468 return JNI_ENOMEM;
2469 }
2470 } else if (match_option(option, "--add-exports=", &tail)) {
2471 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2472 return JNI_ENOMEM;
2473 }
2474 } else if (match_option(option, "--add-opens=", &tail)) {
2475 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2476 return JNI_ENOMEM;
2477 }
2478 } else if (match_option(option, "--add-modules=", &tail)) {
2479 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2480 return JNI_ENOMEM;
2481 }
2482 } else if (match_option(option, "--enable-native-access=", &tail)) {
2483 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2484 return JNI_ENOMEM;
2485 }
2486 } else if (match_option(option, "--limit-modules=", &tail)) {
2487 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2488 return JNI_ENOMEM;
2489 }
2490 } else if (match_option(option, "--module-path=", &tail)) {
2491 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2492 return JNI_ENOMEM;
2493 }
2494 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2495 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2496 return JNI_ENOMEM;
2497 }
2498 } else if (match_option(option, "--patch-module=", &tail)) {
2499 // --patch-module=<module>=<file>(<pathsep><file>)*
2500 int res = process_patch_mod_option(tail, patch_mod_javabase);
2501 if (res != JNI_OK) {
2502 return res;
2503 }
2504 } else if (match_option(option, "--illegal-access=", &tail)) {
2505 char version[256];
2506 JDK_Version::jdk(17).to_string(version, sizeof(version));
2507 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2508 // -agentlib and -agentpath
2509 } else if (match_option(option, "-agentlib:", &tail) ||
2510 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2511 if(tail != NULL) {
2512 const char* pos = strchr(tail, '=');
2513 char* name;
2514 if (pos == NULL) {
2515 name = os::strdup_check_oom(tail, mtArguments);
2516 } else {
2517 size_t len = pos - tail;
2518 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2519 memcpy(name, tail, len);
2520 name[len] = '\0';
2521 }
2522
2523 char *options = NULL;
2524 if(pos != NULL) {
2525 options = os::strdup_check_oom(pos + 1, mtArguments);
2526 }
2527 #if !INCLUDE_JVMTI
2528 if (valid_jdwp_agent(name, is_absolute_path)) {
2529 jio_fprintf(defaultStream::error_stream(),
2530 "Debugging agents are not supported in this VM\n");
2531 return JNI_ERR;
2532 }
2533 #endif // !INCLUDE_JVMTI
2534 add_init_agent(name, options, is_absolute_path);
2535 }
2536 // -javaagent
2537 } else if (match_option(option, "-javaagent:", &tail)) {
2538 #if !INCLUDE_JVMTI
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Instrumentation agents are not supported in this VM\n");
2541 return JNI_ERR;
2542 #else
2543 if (tail != NULL) {
2544 size_t length = strlen(tail) + 1;
2545 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2546 jio_snprintf(options, length, "%s", tail);
2547 add_instrument_agent("instrument", options, false);
2548 // java agents need module java.instrument
2549 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2550 return JNI_ENOMEM;
2551 }
2552 }
2553 #endif // !INCLUDE_JVMTI
2554 // --enable_preview
2555 } else if (match_option(option, "--enable-preview")) {
2556 set_enable_preview();
2557 // -Xnoclassgc
2558 } else if (match_option(option, "-Xnoclassgc")) {
2559 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 // -Xbatch
2563 } else if (match_option(option, "-Xbatch")) {
2564 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2565 return JNI_EINVAL;
2566 }
2567 // -Xmn for compatibility with other JVM vendors
2568 } else if (match_option(option, "-Xmn", &tail)) {
2569 julong long_initial_young_size = 0;
2570 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2571 if (errcode != arg_in_range) {
2572 jio_fprintf(defaultStream::error_stream(),
2573 "Invalid initial young generation size: %s\n", option->optionString);
2574 describe_range_error(errcode);
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2581 return JNI_EINVAL;
2582 }
2583 // -Xms
2584 } else if (match_option(option, "-Xms", &tail)) {
2585 julong size = 0;
2586 // an initial heap size of 0 means automatically determine
2587 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2588 if (errcode != arg_in_range) {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Invalid initial heap size: %s\n", option->optionString);
2591 describe_range_error(errcode);
2592 return JNI_EINVAL;
2593 }
2594 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2598 return JNI_EINVAL;
2599 }
2600 // -Xmx
2601 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2602 julong long_max_heap_size = 0;
2603 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2604 if (errcode != arg_in_range) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid maximum heap size: %s\n", option->optionString);
2607 describe_range_error(errcode);
2608 return JNI_EINVAL;
2609 }
2610 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2611 return JNI_EINVAL;
2612 }
2613 // Xmaxf
2614 } else if (match_option(option, "-Xmaxf", &tail)) {
2615 char* err;
2616 int maxf = (int)(strtod(tail, &err) * 100);
2617 if (*err != '\0' || *tail == '\0') {
2618 jio_fprintf(defaultStream::error_stream(),
2619 "Bad max heap free percentage size: %s\n",
2620 option->optionString);
2621 return JNI_EINVAL;
2622 } else {
2623 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2624 return JNI_EINVAL;
2625 }
2626 }
2627 // Xminf
2628 } else if (match_option(option, "-Xminf", &tail)) {
2629 char* err;
2630 int minf = (int)(strtod(tail, &err) * 100);
2631 if (*err != '\0' || *tail == '\0') {
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Bad min heap free percentage size: %s\n",
2634 option->optionString);
2635 return JNI_EINVAL;
2636 } else {
2637 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 }
2641 // -Xss
2642 } else if (match_option(option, "-Xss", &tail)) {
2643 intx value = 0;
2644 jint err = parse_xss(option, tail, &value);
2645 if (err != JNI_OK) {
2646 return err;
2647 }
2648 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2652 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2653 julong long_ReservedCodeCacheSize = 0;
2654
2655 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2656 if (errcode != arg_in_range) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Invalid maximum code cache size: %s.\n", option->optionString);
2659 return JNI_EINVAL;
2660 }
2661 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2662 return JNI_EINVAL;
2663 }
2664 // -green
2665 } else if (match_option(option, "-green")) {
2666 jio_fprintf(defaultStream::error_stream(),
2667 "Green threads support not available\n");
2668 return JNI_EINVAL;
2669 // -native
2670 } else if (match_option(option, "-native")) {
2671 // HotSpot always uses native threads, ignore silently for compatibility
2672 // -Xrs
2673 } else if (match_option(option, "-Xrs")) {
2674 // Classic/EVM option, new functionality
2675 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 // -Xprof
2679 } else if (match_option(option, "-Xprof")) {
2680 char version[256];
2681 // Obsolete in JDK 10
2682 JDK_Version::jdk(10).to_string(version, sizeof(version));
2683 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2684 // -Xinternalversion
2685 } else if (match_option(option, "-Xinternalversion")) {
2686 jio_fprintf(defaultStream::output_stream(), "%s\n",
2687 VM_Version::internal_vm_info_string());
2688 vm_exit(0);
2689 #ifndef PRODUCT
2690 // -Xprintflags
2691 } else if (match_option(option, "-Xprintflags")) {
2692 JVMFlag::printFlags(tty, false);
2693 vm_exit(0);
2694 #endif
2695 // -D
2696 } else if (match_option(option, "-D", &tail)) {
2697 const char* value;
2698 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2699 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2700 // abort if -Djava.endorsed.dirs is set
2701 jio_fprintf(defaultStream::output_stream(),
2702 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2703 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2704 return JNI_EINVAL;
2705 }
2706 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2707 *value != '\0' && strcmp(value, "\"\"") != 0) {
2708 // abort if -Djava.ext.dirs is set
2709 jio_fprintf(defaultStream::output_stream(),
2710 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2711 return JNI_EINVAL;
2712 }
2713 // Check for module related properties. They must be set using the modules
2714 // options. For example: use "--add-modules=java.sql", not
2715 // "-Djdk.module.addmods=java.sql"
2716 if (is_internal_module_property(option->optionString + 2)) {
2717 needs_module_property_warning = true;
2718 continue;
2719 }
2720 if (!add_property(tail)) {
2721 return JNI_ENOMEM;
2722 }
2723 // Out of the box management support
2724 if (match_option(option, "-Dcom.sun.management", &tail)) {
2725 #if INCLUDE_MANAGEMENT
2726 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 // management agent in module jdk.management.agent
2730 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2731 return JNI_ENOMEM;
2732 }
2733 #else
2734 jio_fprintf(defaultStream::output_stream(),
2735 "-Dcom.sun.management is not supported in this VM.\n");
2736 return JNI_ERR;
2737 #endif
2738 }
2739 // -Xint
2740 } else if (match_option(option, "-Xint")) {
2741 set_mode_flags(_int);
2742 // -Xmixed
2743 } else if (match_option(option, "-Xmixed")) {
2744 set_mode_flags(_mixed);
2745 // -Xcomp
2746 } else if (match_option(option, "-Xcomp")) {
2747 // for testing the compiler; turn off all flags that inhibit compilation
2748 set_mode_flags(_comp);
2749 // -Xshare:dump
2750 } else if (match_option(option, "-Xshare:dump")) {
2751 DumpSharedSpaces = true;
2752 // -Xshare:on
2753 } else if (match_option(option, "-Xshare:on")) {
2754 UseSharedSpaces = true;
2755 RequireSharedSpaces = true;
2756 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2757 } else if (match_option(option, "-Xshare:auto")) {
2758 UseSharedSpaces = true;
2759 RequireSharedSpaces = false;
2760 xshare_auto_cmd_line = true;
2761 // -Xshare:off
2762 } else if (match_option(option, "-Xshare:off")) {
2763 UseSharedSpaces = false;
2764 RequireSharedSpaces = false;
2765 // -Xverify
2766 } else if (match_option(option, "-Xverify", &tail)) {
2767 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2768 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 } else if (strcmp(tail, ":remote") == 0) {
2775 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 } else if (strcmp(tail, ":none") == 0) {
2782 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2789 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2790 return JNI_EINVAL;
2791 }
2792 // -Xdebug
2793 } else if (match_option(option, "-Xdebug")) {
2794 // note this flag has been used, then ignore
2795 set_xdebug_mode(true);
2796 // -Xnoagent
2797 } else if (match_option(option, "-Xnoagent")) {
2798 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2799 } else if (match_option(option, "-Xloggc:", &tail)) {
2800 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2801 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2802 _legacyGCLogging.lastFlag = 2;
2803 _legacyGCLogging.file = os::strdup_check_oom(tail);
2804 } else if (match_option(option, "-Xlog", &tail)) {
2805 bool ret = false;
2806 if (strcmp(tail, ":help") == 0) {
2807 fileStream stream(defaultStream::output_stream());
2808 LogConfiguration::print_command_line_help(&stream);
2809 vm_exit(0);
2810 } else if (strcmp(tail, ":disable") == 0) {
2811 LogConfiguration::disable_logging();
2812 ret = true;
2813 } else if (strcmp(tail, ":async") == 0) {
2814 LogConfiguration::set_async_mode(true);
2815 ret = true;
2816 } else if (*tail == '\0') {
2817 ret = LogConfiguration::parse_command_line_arguments();
2818 assert(ret, "-Xlog without arguments should never fail to parse");
2819 } else if (*tail == ':') {
2820 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2821 }
2822 if (ret == false) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2825 tail);
2826 return JNI_EINVAL;
2827 }
2828 // JNI hooks
2829 } else if (match_option(option, "-Xcheck", &tail)) {
2830 if (!strcmp(tail, ":jni")) {
2831 #if !INCLUDE_JNI_CHECK
2832 warning("JNI CHECKING is not supported in this VM");
2833 #else
2834 CheckJNICalls = true;
2835 #endif // INCLUDE_JNI_CHECK
2836 } else if (is_bad_option(option, args->ignoreUnrecognized,
2837 "check")) {
2838 return JNI_EINVAL;
2839 }
2840 } else if (match_option(option, "vfprintf")) {
2841 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2842 } else if (match_option(option, "exit")) {
2843 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2844 } else if (match_option(option, "abort")) {
2845 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2846 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2847 // and the last option wins.
2848 } else if (match_option(option, "-XX:+NeverTenure")) {
2849 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2850 return JNI_EINVAL;
2851 }
2852 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2859 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2869 uintx max_tenuring_thresh = 0;
2870 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2873 return JNI_EINVAL;
2874 }
2875
2876 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2877 return JNI_EINVAL;
2878 }
2879
2880 if (MaxTenuringThreshold == 0) {
2881 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 } else {
2888 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 }
2895 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2896 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2903 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2910 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2917 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 } else if (match_option(option, "--finalization=", &tail)) {
2924 if (strcmp(tail, "enabled") == 0) {
2925 InstanceKlass::set_finalization_enabled(true);
2926 } else if (strcmp(tail, "disabled") == 0) {
2927 InstanceKlass::set_finalization_enabled(false);
2928 } else {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2931 tail);
2932 return JNI_EINVAL;
2933 }
2934 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2935 #if defined(DTRACE_ENABLED)
2936 warning("Option ExtendedDTraceProbes was deprecated in version 19 and will likely be removed in a future release.");
2937 warning("Use the combination of -XX:+DTraceMethodProbes, -XX:+DTraceAllocProbes and -XX:+DTraceMonitorProbes instead.");
2938 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2939 return JNI_EINVAL;
2940 }
2941 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2945 return JNI_EINVAL;
2946 }
2947 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 #else // defined(DTRACE_ENABLED)
2951 jio_fprintf(defaultStream::error_stream(),
2952 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2953 return JNI_EINVAL;
2954 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "DTraceMethodProbes flag is not applicable for this configuration\n");
2957 return JNI_EINVAL;
2958 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2959 jio_fprintf(defaultStream::error_stream(),
2960 "DTraceAllocProbes flag is not applicable for this configuration\n");
2961 return JNI_EINVAL;
2962 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2963 jio_fprintf(defaultStream::error_stream(),
2964 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2965 return JNI_EINVAL;
2966 #endif // defined(DTRACE_ENABLED)
2967 #ifdef ASSERT
2968 } else if (match_option(option, "-XX:+FullGCALot")) {
2969 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 // disable scavenge before parallel mark-compact
2973 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2974 return JNI_EINVAL;
2975 }
2976 #endif
2977 #if !INCLUDE_MANAGEMENT
2978 } else if (match_option(option, "-XX:+ManagementServer")) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "ManagementServer is not supported in this VM.\n");
2981 return JNI_ERR;
2982 #endif // INCLUDE_MANAGEMENT
2983 #if INCLUDE_JVMCI
2984 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2985 if (EnableJVMCIProduct) {
2986 jio_fprintf(defaultStream::error_stream(),
2987 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2988 return JNI_EINVAL;
2989 }
2990 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2991 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2992 if (EnableJVMCIProduct) {
2993 continue;
2994 }
2995 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2996 // Allow this flag if it has been unlocked.
2997 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2998 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "Unable to enable JVMCI in product mode");
3001 return JNI_ERR;
3002 }
3003 }
3004 // The flag was locked so process normally to report that error
3005 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3006 return JNI_EINVAL;
3007 }
3008 #endif // INCLUDE_JVMCI
3009 #if INCLUDE_JFR
3010 } else if (match_jfr_option(&option)) {
3011 return JNI_EINVAL;
3012 #endif
3013 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3014 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3015 // already been handled
3016 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3017 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3018 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3019 return JNI_EINVAL;
3020 }
3021 }
3022 // Unknown option
3023 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3024 return JNI_ERR;
3025 }
3026 }
3027
3028 // PrintSharedArchiveAndExit will turn on
3029 // -Xshare:on
3030 // -Xlog:class+path=info
3031 if (PrintSharedArchiveAndExit) {
3032 UseSharedSpaces = true;
3033 RequireSharedSpaces = true;
3034 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3035 }
3036
3037 fix_appclasspath();
3038
3039 return JNI_OK;
3040 }
3041
3042 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3043 // For java.base check for duplicate --patch-module options being specified on the command line.
3044 // This check is only required for java.base, all other duplicate module specifications
3045 // will be checked during module system initialization. The module system initialization
3046 // will throw an ExceptionInInitializerError if this situation occurs.
3047 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3048 if (*patch_mod_javabase) {
3049 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3050 } else {
3051 *patch_mod_javabase = true;
3052 }
3053 }
3054
3055 // Create GrowableArray lazily, only if --patch-module has been specified
3056 if (_patch_mod_prefix == NULL) {
3057 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
3058 }
3059
3060 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3061 }
3062
3063 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3064 //
3065 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3066 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3067 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3068 // path is treated as the current directory.
3069 //
3070 // This causes problems with CDS, which requires that all directories specified in the classpath
3071 // must be empty. In most cases, applications do NOT want to load classes from the current
3072 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3073 // scripts compatible with CDS.
3074 void Arguments::fix_appclasspath() {
3075 if (IgnoreEmptyClassPaths) {
3076 const char separator = *os::path_separator();
3077 const char* src = _java_class_path->value();
3078
3079 // skip over all the leading empty paths
3080 while (*src == separator) {
3081 src ++;
3082 }
3083
3084 char* copy = os::strdup_check_oom(src, mtArguments);
3085
3086 // trim all trailing empty paths
3087 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3088 *tail = '\0';
3089 }
3090
3091 char from[3] = {separator, separator, '\0'};
3092 char to [2] = {separator, '\0'};
3093 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3094 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3095 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3096 }
3097
3098 _java_class_path->set_writeable_value(copy);
3099 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3100 }
3101 }
3102
3103 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3104 // check if the default lib/endorsed directory exists; if so, error
3105 char path[JVM_MAXPATHLEN];
3106 const char* fileSep = os::file_separator();
3107 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3108
3109 DIR* dir = os::opendir(path);
3110 if (dir != NULL) {
3111 jio_fprintf(defaultStream::output_stream(),
3112 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3113 "in modular form will be supported via the concept of upgradeable modules.\n");
3114 os::closedir(dir);
3115 return JNI_ERR;
3116 }
3117
3118 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3119 dir = os::opendir(path);
3120 if (dir != NULL) {
3121 jio_fprintf(defaultStream::output_stream(),
3122 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3123 "Use -classpath instead.\n.");
3124 os::closedir(dir);
3125 return JNI_ERR;
3126 }
3127
3128 // This must be done after all arguments have been processed
3129 // and the container support has been initialized since AggressiveHeap
3130 // relies on the amount of total memory available.
3131 if (AggressiveHeap) {
3132 jint result = set_aggressive_heap_flags();
3133 if (result != JNI_OK) {
3134 return result;
3135 }
3136 }
3137
3138 // This must be done after all arguments have been processed.
3139 // java_compiler() true means set to "NONE" or empty.
3140 if (java_compiler() && !xdebug_mode()) {
3141 // For backwards compatibility, we switch to interpreted mode if
3142 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3143 // not specified.
3144 set_mode_flags(_int);
3145 }
3146
3147 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3148 // but like -Xint, leave compilation thresholds unaffected.
3149 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3150 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3151 set_mode_flags(_int);
3152 }
3153
3154 #ifdef ZERO
3155 // Zero always runs in interpreted mode
3156 set_mode_flags(_int);
3157 #endif
3158
3159 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3160 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3161 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3162 }
3163
3164 #if !COMPILER2_OR_JVMCI
3165 // Don't degrade server performance for footprint
3166 if (FLAG_IS_DEFAULT(UseLargePages) &&
3167 MaxHeapSize < LargePageHeapSizeThreshold) {
3168 // No need for large granularity pages w/small heaps.
3169 // Note that large pages are enabled/disabled for both the
3170 // Java heap and the code cache.
3171 FLAG_SET_DEFAULT(UseLargePages, false);
3172 }
3173
3174 UNSUPPORTED_OPTION(ProfileInterpreter);
3175 #endif
3176
3177 // Parse the CompilationMode flag
3178 if (!CompilationModeFlag::initialize()) {
3179 return JNI_ERR;
3180 }
3181
3182 if (!check_vm_args_consistency()) {
3183 return JNI_ERR;
3184 }
3185
3186 #if INCLUDE_CDS
3187 if (DumpSharedSpaces) {
3188 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3189 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3190 // compiler just to be safe.
3191 //
3192 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3193 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3194 // TODO: revisit the following for the static archive case.
3195 set_mode_flags(_int);
3196 }
3197
3198 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3199 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3200 jio_fprintf(defaultStream::output_stream(),
3201 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3202 return JNI_ERR;
3203 }
3204
3205 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3206 DynamicDumpSharedSpaces = false;
3207 } else {
3208 DynamicDumpSharedSpaces = true;
3209 }
3210
3211 if (AutoCreateSharedArchive) {
3212 if (SharedArchiveFile == NULL) {
3213 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3214 return JNI_ERR;
3215 }
3216 if (ArchiveClassesAtExit != NULL) {
3217 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3218 return JNI_ERR;
3219 }
3220 }
3221
3222 if (UseSharedSpaces && patch_mod_javabase) {
3223 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3224 }
3225 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3226 UseSharedSpaces = false;
3227 }
3228
3229 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3230 // Always verify non-system classes during CDS dump
3231 if (!BytecodeVerificationRemote) {
3232 BytecodeVerificationRemote = true;
3233 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3234 }
3235 }
3236 #endif
3237
3238 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3239 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3240 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3241
3242 return JNI_OK;
3243 }
3244
3245 // Helper class for controlling the lifetime of JavaVMInitArgs
3246 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3247 // deleted on the destruction of the ScopedVMInitArgs object.
3248 class ScopedVMInitArgs : public StackObj {
3249 private:
3250 JavaVMInitArgs _args;
3251 char* _container_name;
3252 bool _is_set;
3253 char* _vm_options_file_arg;
3254
3255 public:
3256 ScopedVMInitArgs(const char *container_name) {
3257 _args.version = JNI_VERSION_1_2;
3258 _args.nOptions = 0;
3259 _args.options = NULL;
3260 _args.ignoreUnrecognized = false;
3261 _container_name = (char *)container_name;
3262 _is_set = false;
3263 _vm_options_file_arg = NULL;
3264 }
3265
3266 // Populates the JavaVMInitArgs object represented by this
3267 // ScopedVMInitArgs object with the arguments in options. The
3268 // allocated memory is deleted by the destructor. If this method
3269 // returns anything other than JNI_OK, then this object is in a
3270 // partially constructed state, and should be abandoned.
3271 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3272 _is_set = true;
3273 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3274 JavaVMOption, options->length(), mtArguments);
3275 if (options_arr == NULL) {
3276 return JNI_ENOMEM;
3277 }
3278 _args.options = options_arr;
3279
3280 for (int i = 0; i < options->length(); i++) {
3281 options_arr[i] = options->at(i);
3282 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3283 if (options_arr[i].optionString == NULL) {
3284 // Rely on the destructor to do cleanup.
3285 _args.nOptions = i;
3286 return JNI_ENOMEM;
3287 }
3288 }
3289
3290 _args.nOptions = options->length();
3291 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3292 return JNI_OK;
3293 }
3294
3295 JavaVMInitArgs* get() { return &_args; }
3296 char* container_name() { return _container_name; }
3297 bool is_set() { return _is_set; }
3298 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3299 char* vm_options_file_arg() { return _vm_options_file_arg; }
3300
3301 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3302 if (_vm_options_file_arg != NULL) {
3303 os::free(_vm_options_file_arg);
3304 }
3305 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3306 }
3307
3308 ~ScopedVMInitArgs() {
3309 if (_vm_options_file_arg != NULL) {
3310 os::free(_vm_options_file_arg);
3311 }
3312 if (_args.options == NULL) return;
3313 for (int i = 0; i < _args.nOptions; i++) {
3314 os::free(_args.options[i].optionString);
3315 }
3316 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3317 }
3318
3319 // Insert options into this option list, to replace option at
3320 // vm_options_file_pos (-XX:VMOptionsFile)
3321 jint insert(const JavaVMInitArgs* args,
3322 const JavaVMInitArgs* args_to_insert,
3323 const int vm_options_file_pos) {
3324 assert(_args.options == NULL, "shouldn't be set yet");
3325 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3326 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3327
3328 int length = args->nOptions + args_to_insert->nOptions - 1;
3329 // Construct new option array
3330 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3331 for (int i = 0; i < args->nOptions; i++) {
3332 if (i == vm_options_file_pos) {
3333 // insert the new options starting at the same place as the
3334 // -XX:VMOptionsFile option
3335 for (int j = 0; j < args_to_insert->nOptions; j++) {
3336 options.push(args_to_insert->options[j]);
3337 }
3338 } else {
3339 options.push(args->options[i]);
3340 }
3341 }
3342 // make into options array
3343 return set_args(&options);
3344 }
3345 };
3346
3347 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3348 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3349 }
3350
3351 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3352 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3353 }
3354
3355 jint Arguments::parse_options_environment_variable(const char* name,
3356 ScopedVMInitArgs* vm_args) {
3357 char *buffer = ::getenv(name);
3358
3359 // Don't check this environment variable if user has special privileges
3360 // (e.g. unix su command).
3361 if (buffer == NULL || os::have_special_privileges()) {
3362 return JNI_OK;
3363 }
3364
3365 if ((buffer = os::strdup(buffer)) == NULL) {
3366 return JNI_ENOMEM;
3367 }
3368
3369 jio_fprintf(defaultStream::error_stream(),
3370 "Picked up %s: %s\n", name, buffer);
3371
3372 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3373
3374 os::free(buffer);
3375 return retcode;
3376 }
3377
3378 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3379 // read file into buffer
3380 int fd = ::open(file_name, O_RDONLY);
3381 if (fd < 0) {
3382 jio_fprintf(defaultStream::error_stream(),
3383 "Could not open options file '%s'\n",
3384 file_name);
3385 return JNI_ERR;
3386 }
3387
3388 struct stat stbuf;
3389 int retcode = os::stat(file_name, &stbuf);
3390 if (retcode != 0) {
3391 jio_fprintf(defaultStream::error_stream(),
3392 "Could not stat options file '%s'\n",
3393 file_name);
3394 ::close(fd);
3395 return JNI_ERR;
3396 }
3397
3398 if (stbuf.st_size == 0) {
3399 // tell caller there is no option data and that is ok
3400 ::close(fd);
3401 return JNI_OK;
3402 }
3403
3404 // '+ 1' for NULL termination even with max bytes
3405 size_t bytes_alloc = stbuf.st_size + 1;
3406
3407 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3408 if (NULL == buf) {
3409 jio_fprintf(defaultStream::error_stream(),
3410 "Could not allocate read buffer for options file parse\n");
3411 ::close(fd);
3412 return JNI_ENOMEM;
3413 }
3414
3415 memset(buf, 0, bytes_alloc);
3416
3417 // Fill buffer
3418 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3419 ::close(fd);
3420 if (bytes_read < 0) {
3421 FREE_C_HEAP_ARRAY(char, buf);
3422 jio_fprintf(defaultStream::error_stream(),
3423 "Could not read options file '%s'\n", file_name);
3424 return JNI_ERR;
3425 }
3426
3427 if (bytes_read == 0) {
3428 // tell caller there is no option data and that is ok
3429 FREE_C_HEAP_ARRAY(char, buf);
3430 return JNI_OK;
3431 }
3432
3433 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3434
3435 FREE_C_HEAP_ARRAY(char, buf);
3436 return retcode;
3437 }
3438
3439 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3440 // Construct option array
3441 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3442
3443 // some pointers to help with parsing
3444 char *buffer_end = buffer + buf_len;
3445 char *opt_hd = buffer;
3446 char *wrt = buffer;
3447 char *rd = buffer;
3448
3449 // parse all options
3450 while (rd < buffer_end) {
3451 // skip leading white space from the input string
3452 while (rd < buffer_end && isspace(*rd)) {
3453 rd++;
3454 }
3455
3456 if (rd >= buffer_end) {
3457 break;
3458 }
3459
3460 // Remember this is where we found the head of the token.
3461 opt_hd = wrt;
3462
3463 // Tokens are strings of non white space characters separated
3464 // by one or more white spaces.
3465 while (rd < buffer_end && !isspace(*rd)) {
3466 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3467 int quote = *rd; // matching quote to look for
3468 rd++; // don't copy open quote
3469 while (rd < buffer_end && *rd != quote) {
3470 // include everything (even spaces)
3471 // up until the close quote
3472 *wrt++ = *rd++; // copy to option string
3473 }
3474
3475 if (rd < buffer_end) {
3476 rd++; // don't copy close quote
3477 } else {
3478 // did not see closing quote
3479 jio_fprintf(defaultStream::error_stream(),
3480 "Unmatched quote in %s\n", name);
3481 return JNI_ERR;
3482 }
3483 } else {
3484 *wrt++ = *rd++; // copy to option string
3485 }
3486 }
3487
3488 // steal a white space character and set it to NULL
3489 *wrt++ = '\0';
3490 // We now have a complete token
3491
3492 JavaVMOption option;
3493 option.optionString = opt_hd;
3494 option.extraInfo = NULL;
3495
3496 options.append(option); // Fill in option
3497
3498 rd++; // Advance to next character
3499 }
3500
3501 // Fill out JavaVMInitArgs structure.
3502 return vm_args->set_args(&options);
3503 }
3504
3505 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3506 if (DumpSharedSpaces) {
3507 if (RequireSharedSpaces) {
3508 warning("Cannot dump shared archive while using shared archive");
3509 }
3510 UseSharedSpaces = false;
3511 }
3512 #if INCLUDE_CDS
3513 // Initialize shared archive paths which could include both base and dynamic archive paths
3514 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3515 //
3516 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3517 if (DumpSharedSpaces || UseSharedSpaces) {
3518 init_shared_archive_paths();
3519 }
3520 #endif // INCLUDE_CDS
3521 }
3522
3523 #if INCLUDE_CDS
3524 // Sharing support
3525 // Construct the path to the archive
3526 char* Arguments::get_default_shared_archive_path() {
3527 char *default_archive_path;
3528 char jvm_path[JVM_MAXPATHLEN];
3529 os::jvm_path(jvm_path, sizeof(jvm_path));
3530 char *end = strrchr(jvm_path, *os::file_separator());
3531 if (end != NULL) *end = '\0';
3532 size_t jvm_path_len = strlen(jvm_path);
3533 size_t file_sep_len = strlen(os::file_separator());
3534 const size_t len = jvm_path_len + file_sep_len + 20;
3535 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3536 jio_snprintf(default_archive_path, len,
3537 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3538 jvm_path, os::file_separator());
3539 return default_archive_path;
3540 }
3541
3542 int Arguments::num_archives(const char* archive_path) {
3543 if (archive_path == NULL) {
3544 return 0;
3545 }
3546 int npaths = 1;
3547 char* p = (char*)archive_path;
3548 while (*p != '\0') {
3549 if (*p == os::path_separator()[0]) {
3550 npaths++;
3551 }
3552 p++;
3553 }
3554 return npaths;
3555 }
3556
3557 void Arguments::extract_shared_archive_paths(const char* archive_path,
3558 char** base_archive_path,
3559 char** top_archive_path) {
3560 char* begin_ptr = (char*)archive_path;
3561 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3562 if (end_ptr == NULL || end_ptr == begin_ptr) {
3563 vm_exit_during_initialization("Base archive was not specified", archive_path);
3564 }
3565 size_t len = end_ptr - begin_ptr;
3566 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3567 strncpy(cur_path, begin_ptr, len);
3568 cur_path[len] = '\0';
3569 *base_archive_path = cur_path;
3570
3571 begin_ptr = ++end_ptr;
3572 if (*begin_ptr == '\0') {
3573 vm_exit_during_initialization("Top archive was not specified", archive_path);
3574 }
3575 end_ptr = strchr(begin_ptr, '\0');
3576 assert(end_ptr != NULL, "sanity");
3577 len = end_ptr - begin_ptr;
3578 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3579 strncpy(cur_path, begin_ptr, len + 1);
3580 *top_archive_path = cur_path;
3581 }
3582
3583 void Arguments::init_shared_archive_paths() {
3584 if (ArchiveClassesAtExit != nullptr) {
3585 assert(!RecordDynamicDumpInfo, "already checked");
3586 if (DumpSharedSpaces) {
3587 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3588 }
3589 check_unsupported_dumping_properties();
3590
3591 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3592 vm_exit_during_initialization(
3593 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3594 }
3595 }
3596
3597 if (SharedArchiveFile == nullptr) {
3598 SharedArchivePath = get_default_shared_archive_path();
3599 } else {
3600 int archives = num_archives(SharedArchiveFile);
3601 assert(archives > 0, "must be");
3602
3603 if (is_dumping_archive() && archives > 1) {
3604 vm_exit_during_initialization(
3605 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3606 }
3607
3608 if (DumpSharedSpaces) {
3609 assert(archives == 1, "must be");
3610 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3611 // will be overwritten no matter regardless of its contents
3612 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3613 } else {
3614 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3615 // is read from top.jsa
3616 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3617 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3618 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3619 //
3620 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3621 // allow cases (b) and (c). Case (b) is already checked above.
3622
3623 if (archives > 2) {
3624 vm_exit_during_initialization(
3625 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3626 }
3627 if (archives == 1) {
3628 char* base_archive_path = NULL;
3629 bool success =
3630 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3631 if (!success) {
3632 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3633 // regenerate the dynamic archive base on default archive.
3634 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3635 DynamicDumpSharedSpaces = true;
3636 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3637 SharedArchivePath = get_default_shared_archive_path();
3638 SharedArchiveFile = nullptr;
3639 } else {
3640 if (AutoCreateSharedArchive) {
3641 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3642 AutoCreateSharedArchive = false;
3643 }
3644 no_shared_spaces("invalid archive");
3645 }
3646 } else if (base_archive_path == NULL) {
3647 // User has specified a single archive, which is a static archive.
3648 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3649 } else {
3650 // User has specified a single archive, which is a dynamic archive.
3651 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3652 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3653 }
3654 } else {
3655 extract_shared_archive_paths((const char*)SharedArchiveFile,
3656 &SharedArchivePath, &SharedDynamicArchivePath);
3657 if (SharedArchivePath == NULL) {
3658 assert(SharedDynamicArchivePath == NULL, "must be");
3659 no_shared_spaces("invalid archive");
3660 }
3661 }
3662
3663 if (SharedDynamicArchivePath != nullptr) {
3664 // Check for case (c)
3665 if (RecordDynamicDumpInfo) {
3666 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3667 SharedArchiveFile);
3668 }
3669 if (ArchiveClassesAtExit != nullptr) {
3670 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3671 SharedArchiveFile);
3672 }
3673 }
3674
3675 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3676 vm_exit_during_initialization(
3677 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3678 SharedArchiveFile);
3679 }
3680 }
3681 }
3682 }
3683 #endif // INCLUDE_CDS
3684
3685 #ifndef PRODUCT
3686 // Determine whether LogVMOutput should be implicitly turned on.
3687 static bool use_vm_log() {
3688 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3689 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3690 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3691 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3692 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3693 return true;
3694 }
3695
3696 #ifdef COMPILER1
3697 if (PrintC1Statistics) {
3698 return true;
3699 }
3700 #endif // COMPILER1
3701
3702 #ifdef COMPILER2
3703 if (PrintOptoAssembly || PrintOptoStatistics) {
3704 return true;
3705 }
3706 #endif // COMPILER2
3707
3708 return false;
3709 }
3710
3711 #endif // PRODUCT
3712
3713 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3714 for (int index = 0; index < args->nOptions; index++) {
3715 const JavaVMOption* option = args->options + index;
3716 const char* tail;
3717 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3718 return true;
3719 }
3720 }
3721 return false;
3722 }
3723
3724 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3725 const char* vm_options_file,
3726 const int vm_options_file_pos,
3727 ScopedVMInitArgs* vm_options_file_args,
3728 ScopedVMInitArgs* args_out) {
3729 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3730 if (code != JNI_OK) {
3731 return code;
3732 }
3733
3734 if (vm_options_file_args->get()->nOptions < 1) {
3735 return JNI_OK;
3736 }
3737
3738 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3739 jio_fprintf(defaultStream::error_stream(),
3740 "A VM options file may not refer to a VM options file. "
3741 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3742 "options file '%s' in options container '%s' is an error.\n",
3743 vm_options_file_args->vm_options_file_arg(),
3744 vm_options_file_args->container_name());
3745 return JNI_EINVAL;
3746 }
3747
3748 return args_out->insert(args, vm_options_file_args->get(),
3749 vm_options_file_pos);
3750 }
3751
3752 // Expand -XX:VMOptionsFile found in args_in as needed.
3753 // mod_args and args_out parameters may return values as needed.
3754 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3755 ScopedVMInitArgs* mod_args,
3756 JavaVMInitArgs** args_out) {
3757 jint code = match_special_option_and_act(args_in, mod_args);
3758 if (code != JNI_OK) {
3759 return code;
3760 }
3761
3762 if (mod_args->is_set()) {
3763 // args_in contains -XX:VMOptionsFile and mod_args contains the
3764 // original options from args_in along with the options expanded
3765 // from the VMOptionsFile. Return a short-hand to the caller.
3766 *args_out = mod_args->get();
3767 } else {
3768 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3769 }
3770 return JNI_OK;
3771 }
3772
3773 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3774 ScopedVMInitArgs* args_out) {
3775 // Remaining part of option string
3776 const char* tail;
3777 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3778
3779 for (int index = 0; index < args->nOptions; index++) {
3780 const JavaVMOption* option = args->options + index;
3781 if (match_option(option, "-XX:Flags=", &tail)) {
3782 Arguments::set_jvm_flags_file(tail);
3783 continue;
3784 }
3785 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3786 if (vm_options_file_args.found_vm_options_file_arg()) {
3787 jio_fprintf(defaultStream::error_stream(),
3788 "The option '%s' is already specified in the options "
3789 "container '%s' so the specification of '%s' in the "
3790 "same options container is an error.\n",
3791 vm_options_file_args.vm_options_file_arg(),
3792 vm_options_file_args.container_name(),
3793 option->optionString);
3794 return JNI_EINVAL;
3795 }
3796 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3797 // If there's a VMOptionsFile, parse that
3798 jint code = insert_vm_options_file(args, tail, index,
3799 &vm_options_file_args, args_out);
3800 if (code != JNI_OK) {
3801 return code;
3802 }
3803 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3804 if (args_out->is_set()) {
3805 // The VMOptions file inserted some options so switch 'args'
3806 // to the new set of options, and continue processing which
3807 // preserves "last option wins" semantics.
3808 args = args_out->get();
3809 // The first option from the VMOptionsFile replaces the
3810 // current option. So we back track to process the
3811 // replacement option.
3812 index--;
3813 }
3814 continue;
3815 }
3816 if (match_option(option, "-XX:+PrintVMOptions")) {
3817 PrintVMOptions = true;
3818 continue;
3819 }
3820 if (match_option(option, "-XX:-PrintVMOptions")) {
3821 PrintVMOptions = false;
3822 continue;
3823 }
3824 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3825 IgnoreUnrecognizedVMOptions = true;
3826 continue;
3827 }
3828 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3829 IgnoreUnrecognizedVMOptions = false;
3830 continue;
3831 }
3832 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3833 JVMFlag::printFlags(tty, false);
3834 vm_exit(0);
3835 }
3836
3837 #ifndef PRODUCT
3838 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3839 JVMFlag::printFlags(tty, true);
3840 vm_exit(0);
3841 }
3842 #endif
3843 }
3844 return JNI_OK;
3845 }
3846
3847 static void print_options(const JavaVMInitArgs *args) {
3848 const char* tail;
3849 for (int index = 0; index < args->nOptions; index++) {
3850 const JavaVMOption *option = args->options + index;
3851 if (match_option(option, "-XX:", &tail)) {
3852 logOption(tail);
3853 }
3854 }
3855 }
3856
3857 bool Arguments::handle_deprecated_print_gc_flags() {
3858 if (PrintGC) {
3859 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3860 }
3861 if (PrintGCDetails) {
3862 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3863 }
3864
3865 if (_legacyGCLogging.lastFlag == 2) {
3866 // -Xloggc was used to specify a filename
3867 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3868
3869 LogTarget(Error, logging) target;
3870 LogStream errstream(target);
3871 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3872 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3873 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3874 }
3875 return true;
3876 }
3877
3878 static void apply_debugger_ergo() {
3879 if (ReplayCompiles) {
3880 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3881 }
3882
3883 if (UseDebuggerErgo) {
3884 // Turn on sub-flags
3885 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3886 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3887 }
3888
3889 if (UseDebuggerErgo2) {
3890 // Debugging with limited number of CPUs
3891 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3892 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3893 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3894 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3895 }
3896 }
3897
3898 // Parse entry point called from JNI_CreateJavaVM
3899
3900 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3901 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3902 JVMFlag::check_all_flag_declarations();
3903
3904 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3905 const char* hotspotrc = ".hotspotrc";
3906 bool settings_file_specified = false;
3907 bool needs_hotspotrc_warning = false;
3908 ScopedVMInitArgs initial_vm_options_args("");
3909 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3910 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3911
3912 // Pointers to current working set of containers
3913 JavaVMInitArgs* cur_cmd_args;
3914 JavaVMInitArgs* cur_vm_options_args;
3915 JavaVMInitArgs* cur_java_options_args;
3916 JavaVMInitArgs* cur_java_tool_options_args;
3917
3918 // Containers for modified/expanded options
3919 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3920 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3921 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3922 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3923
3924
3925 jint code =
3926 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3927 if (code != JNI_OK) {
3928 return code;
3929 }
3930
3931 code = parse_java_options_environment_variable(&initial_java_options_args);
3932 if (code != JNI_OK) {
3933 return code;
3934 }
3935
3936 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3937 char *vmoptions = ClassLoader::lookup_vm_options();
3938 if (vmoptions != NULL) {
3939 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3940 FREE_C_HEAP_ARRAY(char, vmoptions);
3941 if (code != JNI_OK) {
3942 return code;
3943 }
3944 }
3945
3946 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3947 &mod_java_tool_options_args,
3948 &cur_java_tool_options_args);
3949 if (code != JNI_OK) {
3950 return code;
3951 }
3952
3953 code = expand_vm_options_as_needed(initial_cmd_args,
3954 &mod_cmd_args,
3955 &cur_cmd_args);
3956 if (code != JNI_OK) {
3957 return code;
3958 }
3959
3960 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3961 &mod_java_options_args,
3962 &cur_java_options_args);
3963 if (code != JNI_OK) {
3964 return code;
3965 }
3966
3967 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3968 &mod_vm_options_args,
3969 &cur_vm_options_args);
3970 if (code != JNI_OK) {
3971 return code;
3972 }
3973
3974 const char* flags_file = Arguments::get_jvm_flags_file();
3975 settings_file_specified = (flags_file != NULL);
3976
3977 if (IgnoreUnrecognizedVMOptions) {
3978 cur_cmd_args->ignoreUnrecognized = true;
3979 cur_java_tool_options_args->ignoreUnrecognized = true;
3980 cur_java_options_args->ignoreUnrecognized = true;
3981 }
3982
3983 // Parse specified settings file
3984 if (settings_file_specified) {
3985 if (!process_settings_file(flags_file, true,
3986 cur_cmd_args->ignoreUnrecognized)) {
3987 return JNI_EINVAL;
3988 }
3989 } else {
3990 #ifdef ASSERT
3991 // Parse default .hotspotrc settings file
3992 if (!process_settings_file(".hotspotrc", false,
3993 cur_cmd_args->ignoreUnrecognized)) {
3994 return JNI_EINVAL;
3995 }
3996 #else
3997 struct stat buf;
3998 if (os::stat(hotspotrc, &buf) == 0) {
3999 needs_hotspotrc_warning = true;
4000 }
4001 #endif
4002 }
4003
4004 if (PrintVMOptions) {
4005 print_options(cur_java_tool_options_args);
4006 print_options(cur_cmd_args);
4007 print_options(cur_java_options_args);
4008 }
4009
4010 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4011 jint result = parse_vm_init_args(cur_vm_options_args,
4012 cur_java_tool_options_args,
4013 cur_java_options_args,
4014 cur_cmd_args);
4015
4016 if (result != JNI_OK) {
4017 return result;
4018 }
4019
4020 // Delay warning until here so that we've had a chance to process
4021 // the -XX:-PrintWarnings flag
4022 if (needs_hotspotrc_warning) {
4023 warning("%s file is present but has been ignored. "
4024 "Run with -XX:Flags=%s to load the file.",
4025 hotspotrc, hotspotrc);
4026 }
4027
4028 if (needs_module_property_warning) {
4029 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4030 " names that are reserved for internal use.");
4031 }
4032
4033 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4034 UNSUPPORTED_OPTION(UseLargePages);
4035 #endif
4036
4037 #if defined(AIX)
4038 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4039 #endif
4040
4041 #ifndef PRODUCT
4042 if (TraceBytecodesAt != 0) {
4043 TraceBytecodes = true;
4044 }
4045 if (CountCompiledCalls) {
4046 if (UseCounterDecay) {
4047 warning("UseCounterDecay disabled because CountCalls is set");
4048 UseCounterDecay = false;
4049 }
4050 }
4051 #endif // PRODUCT
4052
4053 if (ScavengeRootsInCode == 0) {
4054 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4055 warning("Forcing ScavengeRootsInCode non-zero");
4056 }
4057 ScavengeRootsInCode = 1;
4058 }
4059
4060 if (!handle_deprecated_print_gc_flags()) {
4061 return JNI_EINVAL;
4062 }
4063
4064 // Set object alignment values.
4065 set_object_alignment();
4066
4067 #if !INCLUDE_CDS
4068 if (DumpSharedSpaces || RequireSharedSpaces) {
4069 jio_fprintf(defaultStream::error_stream(),
4070 "Shared spaces are not supported in this VM\n");
4071 return JNI_ERR;
4072 }
4073 if (DumpLoadedClassList != NULL) {
4074 jio_fprintf(defaultStream::error_stream(),
4075 "DumpLoadedClassList is not supported in this VM\n");
4076 return JNI_ERR;
4077 }
4078 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
4079 log_is_enabled(Info, cds)) {
4080 warning("Shared spaces are not supported in this VM");
4081 UseSharedSpaces = false;
4082 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4083 }
4084 no_shared_spaces("CDS Disabled");
4085 #endif // INCLUDE_CDS
4086
4087 // Verify NMT arguments
4088 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
4089 if (lvl == NMT_unknown) {
4090 jio_fprintf(defaultStream::error_stream(),
4091 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4092 return JNI_ERR;
4093 }
4094 if (PrintNMTStatistics && lvl == NMT_off) {
4095 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
4096 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
4097 }
4098
4099 if (TraceDependencies && VerifyDependencies) {
4100 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
4101 warning("TraceDependencies results may be inflated by VerifyDependencies");
4102 }
4103 }
4104
4105 apply_debugger_ergo();
4106
4107 if (log_is_enabled(Info, arguments)) {
4108 LogStream st(Log(arguments)::info());
4109 Arguments::print_on(&st);
4110 }
4111
4112 return JNI_OK;
4113 }
4114
4115 jint Arguments::apply_ergo() {
4116 // Set flags based on ergonomics.
4117 jint result = set_ergonomics_flags();
4118 if (result != JNI_OK) return result;
4119
4120 // Set heap size based on available physical memory
4121 set_heap_size();
4122
4123 GCConfig::arguments()->initialize();
4124
4125 set_shared_spaces_flags_and_archive_paths();
4126
4127 // Initialize Metaspace flags and alignments
4128 Metaspace::ergo_initialize();
4129
4130 if (!StringDedup::ergo_initialize()) {
4131 return JNI_EINVAL;
4132 }
4133
4134 // Set compiler flags after GC is selected and GC specific
4135 // flags (LoopStripMiningIter) are set.
4136 CompilerConfig::ergo_initialize();
4137
4138 // Set bytecode rewriting flags
4139 set_bytecode_flags();
4140
4141 // Set flags if aggressive optimization flags are enabled
4142 jint code = set_aggressive_opts_flags();
4143 if (code != JNI_OK) {
4144 return code;
4145 }
4146
4147 #ifdef ZERO
4148 // Clear flags not supported on zero.
4149 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4150
4151 if (LogTouchedMethods) {
4152 warning("LogTouchedMethods is not supported for Zero");
4153 FLAG_SET_DEFAULT(LogTouchedMethods, false);
4154 }
4155 #endif // ZERO
4156
4157 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4158 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4159 DebugNonSafepoints = true;
4160 }
4161
4162 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4163 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4164 }
4165
4166 // Treat the odd case where local verification is enabled but remote
4167 // verification is not as if both were enabled.
4168 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4169 log_info(verification)("Turning on remote verification because local verification is on");
4170 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4171 }
4172
4173 #ifndef PRODUCT
4174 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4175 if (use_vm_log()) {
4176 LogVMOutput = true;
4177 }
4178 }
4179 #endif // PRODUCT
4180
4181 if (PrintCommandLineFlags) {
4182 JVMFlag::printSetFlags(tty);
4183 }
4184
4185 #ifdef COMPILER2
4186 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4187 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4188 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4189 }
4190 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4191
4192 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4193 if (!EnableVectorReboxing) {
4194 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4195 } else {
4196 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4197 }
4198 }
4199 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4200
4201 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4202 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4203 }
4204 FLAG_SET_DEFAULT(UseVectorStubs, false);
4205 }
4206 #endif // COMPILER2
4207
4208 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4209 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4210 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4211 }
4212 }
4213 return JNI_OK;
4214 }
4215
4216 jint Arguments::adjust_after_os() {
4217 if (UseNUMA) {
4218 if (UseParallelGC) {
4219 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4220 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4221 }
4222 }
4223 }
4224 return JNI_OK;
4225 }
4226
4227 int Arguments::PropertyList_count(SystemProperty* pl) {
4228 int count = 0;
4229 while(pl != NULL) {
4230 count++;
4231 pl = pl->next();
4232 }
4233 return count;
4234 }
4235
4236 // Return the number of readable properties.
4237 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4238 int count = 0;
4239 while(pl != NULL) {
4240 if (pl->readable()) {
4241 count++;
4242 }
4243 pl = pl->next();
4244 }
4245 return count;
4246 }
4247
4248 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4249 assert(key != NULL, "just checking");
4250 SystemProperty* prop;
4251 for (prop = pl; prop != NULL; prop = prop->next()) {
4252 if (strcmp(key, prop->key()) == 0) return prop->value();
4253 }
4254 return NULL;
4255 }
4256
4257 // Return the value of the requested property provided that it is a readable property.
4258 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4259 assert(key != NULL, "just checking");
4260 SystemProperty* prop;
4261 // Return the property value if the keys match and the property is not internal or
4262 // it's the special internal property "jdk.boot.class.path.append".
4263 for (prop = pl; prop != NULL; prop = prop->next()) {
4264 if (strcmp(key, prop->key()) == 0) {
4265 if (!prop->internal()) {
4266 return prop->value();
4267 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4268 return prop->value();
4269 } else {
4270 // Property is internal and not jdk.boot.class.path.append so return NULL.
4271 return NULL;
4272 }
4273 }
4274 }
4275 return NULL;
4276 }
4277
4278 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4279 int count = 0;
4280 const char* ret_val = NULL;
4281
4282 while(pl != NULL) {
4283 if(count >= index) {
4284 ret_val = pl->key();
4285 break;
4286 }
4287 count++;
4288 pl = pl->next();
4289 }
4290
4291 return ret_val;
4292 }
4293
4294 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4295 int count = 0;
4296 char* ret_val = NULL;
4297
4298 while(pl != NULL) {
4299 if(count >= index) {
4300 ret_val = pl->value();
4301 break;
4302 }
4303 count++;
4304 pl = pl->next();
4305 }
4306
4307 return ret_val;
4308 }
4309
4310 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4311 SystemProperty* p = *plist;
4312 if (p == NULL) {
4313 *plist = new_p;
4314 } else {
4315 while (p->next() != NULL) {
4316 p = p->next();
4317 }
4318 p->set_next(new_p);
4319 }
4320 }
4321
4322 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4323 bool writeable, bool internal) {
4324 if (plist == NULL)
4325 return;
4326
4327 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4328 PropertyList_add(plist, new_p);
4329 }
4330
4331 void Arguments::PropertyList_add(SystemProperty *element) {
4332 PropertyList_add(&_system_properties, element);
4333 }
4334
4335 // This add maintains unique property key in the list.
4336 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4337 PropertyAppendable append, PropertyWriteable writeable,
4338 PropertyInternal internal) {
4339 if (plist == NULL)
4340 return;
4341
4342 // If property key exists and is writeable, then update with new value.
4343 // Trying to update a non-writeable property is silently ignored.
4344 SystemProperty* prop;
4345 for (prop = *plist; prop != NULL; prop = prop->next()) {
4346 if (strcmp(k, prop->key()) == 0) {
4347 if (append == AppendProperty) {
4348 prop->append_writeable_value(v);
4349 } else {
4350 prop->set_writeable_value(v);
4351 }
4352 return;
4353 }
4354 }
4355
4356 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4357 }
4358
4359 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4360 // Returns true if all of the source pointed by src has been copied over to
4361 // the destination buffer pointed by buf. Otherwise, returns false.
4362 // Notes:
4363 // 1. If the length (buflen) of the destination buffer excluding the
4364 // NULL terminator character is not long enough for holding the expanded
4365 // pid characters, it also returns false instead of returning the partially
4366 // expanded one.
4367 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4368 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4369 char* buf, size_t buflen) {
4370 const char* p = src;
4371 char* b = buf;
4372 const char* src_end = &src[srclen];
4373 char* buf_end = &buf[buflen - 1];
4374
4375 while (p < src_end && b < buf_end) {
4376 if (*p == '%') {
4377 switch (*(++p)) {
4378 case '%': // "%%" ==> "%"
4379 *b++ = *p++;
4380 break;
4381 case 'p': { // "%p" ==> current process id
4382 // buf_end points to the character before the last character so
4383 // that we could write '\0' to the end of the buffer.
4384 size_t buf_sz = buf_end - b + 1;
4385 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4386
4387 // if jio_snprintf fails or the buffer is not long enough to hold
4388 // the expanded pid, returns false.
4389 if (ret < 0 || ret >= (int)buf_sz) {
4390 return false;
4391 } else {
4392 b += ret;
4393 assert(*b == '\0', "fail in copy_expand_pid");
4394 if (p == src_end && b == buf_end + 1) {
4395 // reach the end of the buffer.
4396 return true;
4397 }
4398 }
4399 p++;
4400 break;
4401 }
4402 default :
4403 *b++ = '%';
4404 }
4405 } else {
4406 *b++ = *p++;
4407 }
4408 }
4409 *b = '\0';
4410 return (p == src_end); // return false if not all of the source was copied
4411 }