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 }
1613 }
1614 #endif // _LP64
1615 }
1616
1617 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1618 // set_use_compressed_oops().
1619 void Arguments::set_use_compressed_klass_ptrs() {
1620 #ifdef _LP64
1621 if (!UseCompressedClassPointers) {
1622 // Lilliput requires compressed class pointers. Default shall reflect that.
1623 // If user specifies -UseCompressedClassPointers, it should be reverted with
1624 // a warning.
1625 assert(!FLAG_IS_DEFAULT(UseCompressedClassPointers), "Wrong default for UseCompressedClassPointers");
1626 warning("Lilliput reqires compressed class pointers.");
1627 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1628 }
1629 // Assert validity of compressed class space size. User arg should have been checked at this point
1630 // (see CompressedClassSpaceSizeConstraintFunc()), so no need to be nice about it, this fires in
1631 // case the default is wrong.
1632 assert(CompressedClassSpaceSize <= Metaspace::max_class_space_size(),
1633 "CompressedClassSpaceSize " SIZE_FORMAT " too large (max: " SIZE_FORMAT ")",
1634 CompressedClassSpaceSize, Metaspace::max_class_space_size());
1635 #endif // _LP64
1636 }
1637
1638 void Arguments::set_conservative_max_heap_alignment() {
1639 // The conservative maximum required alignment for the heap is the maximum of
1640 // the alignments imposed by several sources: any requirements from the heap
1641 // itself and the maximum page size we may run the VM with.
1642 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1643 _conservative_max_heap_alignment = MAX4(heap_alignment,
1644 (size_t)os::vm_allocation_granularity(),
1645 os::max_page_size(),
1646 GCArguments::compute_heap_alignment());
1647 }
1648
1649 jint Arguments::set_ergonomics_flags() {
1650 GCConfig::initialize();
1651
1652 set_conservative_max_heap_alignment();
1653
1654 #ifdef _LP64
1655 set_use_compressed_oops();
1656
1657 // set_use_compressed_klass_ptrs() must be called after calling
1658 // set_use_compressed_oops().
1659 set_use_compressed_klass_ptrs();
1660
1661 // Also checks that certain machines are slower with compressed oops
1662 // in vm_version initialization code.
1663 #endif // _LP64
1664
1665 return JNI_OK;
1666 }
1667
1668 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1669 size_t max_allocatable;
1670 size_t result = limit;
1671 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1672 // The AggressiveHeap check is a temporary workaround to avoid calling
1673 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1674 // selected. This works because AggressiveHeap implies UseParallelGC
1675 // where we know the ratio will be 1. Once the AggressiveHeap option is
1676 // removed, this can be cleaned up.
1677 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1678 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1679 result = MIN2(result, max_allocatable / fraction);
1680 }
1681 return result;
1682 }
1683
1684 // Use static initialization to get the default before parsing
1685 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1686
1687 void Arguments::set_heap_size() {
1688 julong phys_mem;
1689
1690 // If the user specified one of these options, they
1691 // want specific memory sizing so do not limit memory
1692 // based on compressed oops addressability.
1693 // Also, memory limits will be calculated based on
1694 // available os physical memory, not our MaxRAM limit,
1695 // unless MaxRAM is also specified.
1696 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1697 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1698 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1699 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1700 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1701 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1702 !FLAG_IS_DEFAULT(MaxRAM));
1703 if (override_coop_limit) {
1704 if (FLAG_IS_DEFAULT(MaxRAM)) {
1705 phys_mem = os::physical_memory();
1706 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1707 } else {
1708 phys_mem = (julong)MaxRAM;
1709 }
1710 } else {
1711 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1712 : (julong)MaxRAM;
1713 }
1714
1715
1716 // Convert deprecated flags
1717 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1718 !FLAG_IS_DEFAULT(MaxRAMFraction))
1719 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1720
1721 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1722 !FLAG_IS_DEFAULT(MinRAMFraction))
1723 MinRAMPercentage = 100.0 / MinRAMFraction;
1724
1725 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1726 !FLAG_IS_DEFAULT(InitialRAMFraction))
1727 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1728
1729 // If the maximum heap size has not been set with -Xmx,
1730 // then set it as fraction of the size of physical memory,
1731 // respecting the maximum and minimum sizes of the heap.
1732 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1733 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1734 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1735 if (reasonable_min < MaxHeapSize) {
1736 // Small physical memory, so use a minimum fraction of it for the heap
1737 reasonable_max = reasonable_min;
1738 } else {
1739 // Not-small physical memory, so require a heap at least
1740 // as large as MaxHeapSize
1741 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1742 }
1743
1744 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1745 // Limit the heap size to ErgoHeapSizeLimit
1746 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1747 }
1748
1749 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1750
1751 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1752 // An initial heap size was specified on the command line,
1753 // so be sure that the maximum size is consistent. Done
1754 // after call to limit_heap_by_allocatable_memory because that
1755 // method might reduce the allocation size.
1756 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1757 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1758 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1759 }
1760
1761 #ifdef _LP64
1762 if (UseCompressedOops || UseCompressedClassPointers) {
1763 // HeapBaseMinAddress can be greater than default but not less than.
1764 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1765 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1766 // matches compressed oops printing flags
1767 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1768 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1769 DefaultHeapBaseMinAddress,
1770 DefaultHeapBaseMinAddress/G,
1771 HeapBaseMinAddress);
1772 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1773 }
1774 }
1775 }
1776 if (UseCompressedOops) {
1777 // Limit the heap size to the maximum possible when using compressed oops
1778 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1779
1780 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1781 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1782 // but it should be not less than default MaxHeapSize.
1783 max_coop_heap -= HeapBaseMinAddress;
1784 }
1785
1786 // If user specified flags prioritizing os physical
1787 // memory limits, then disable compressed oops if
1788 // limits exceed max_coop_heap and UseCompressedOops
1789 // was not specified.
1790 if (reasonable_max > max_coop_heap) {
1791 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1792 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1793 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1794 "Please check the setting of MaxRAMPercentage %5.2f."
1795 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1796 FLAG_SET_ERGO(UseCompressedOops, false);
1797 } else {
1798 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1799 }
1800 }
1801 }
1802 #endif // _LP64
1803
1804 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1805 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1806 }
1807
1808 // If the minimum or initial heap_size have not been set or requested to be set
1809 // ergonomically, set them accordingly.
1810 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1811 julong reasonable_minimum = (julong)(OldSize + NewSize);
1812
1813 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1814
1815 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1816
1817 if (InitialHeapSize == 0) {
1818 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1819 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1820
1821 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1822 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1823
1824 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1825 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1826 }
1827 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1828 // synchronize with InitialHeapSize to avoid errors with the default value.
1829 if (MinHeapSize == 0) {
1830 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1831 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1832 }
1833 }
1834 }
1835
1836 // This option inspects the machine and attempts to set various
1837 // parameters to be optimal for long-running, memory allocation
1838 // intensive jobs. It is intended for machines with large
1839 // amounts of cpu and memory.
1840 jint Arguments::set_aggressive_heap_flags() {
1841 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1842 // VM, but we may not be able to represent the total physical memory
1843 // available (like having 8gb of memory on a box but using a 32bit VM).
1844 // Thus, we need to make sure we're using a julong for intermediate
1845 // calculations.
1846 julong initHeapSize;
1847 julong total_memory = os::physical_memory();
1848
1849 if (total_memory < (julong) 256 * M) {
1850 jio_fprintf(defaultStream::error_stream(),
1851 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1852 vm_exit(1);
1853 }
1854
1855 // The heap size is half of available memory, or (at most)
1856 // all of possible memory less 160mb (leaving room for the OS
1857 // when using ISM). This is the maximum; because adaptive sizing
1858 // is turned on below, the actual space used may be smaller.
1859
1860 initHeapSize = MIN2(total_memory / (julong) 2,
1861 total_memory - (julong) 160 * M);
1862
1863 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1864
1865 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1866 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1867 return JNI_EINVAL;
1868 }
1869 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1870 return JNI_EINVAL;
1871 }
1872 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1873 return JNI_EINVAL;
1874 }
1875 }
1876 if (FLAG_IS_DEFAULT(NewSize)) {
1877 // Make the young generation 3/8ths of the total heap.
1878 if (FLAG_SET_CMDLINE(NewSize,
1879 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1880 return JNI_EINVAL;
1881 }
1882 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1883 return JNI_EINVAL;
1884 }
1885 }
1886
1887 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1888 FLAG_SET_DEFAULT(UseLargePages, true);
1889 #endif
1890
1891 // Increase some data structure sizes for efficiency
1892 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1893 return JNI_EINVAL;
1894 }
1895 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1899 return JNI_EINVAL;
1900 }
1901
1902 // See the OldPLABSize comment below, but replace 'after promotion'
1903 // with 'after copying'. YoungPLABSize is the size of the survivor
1904 // space per-gc-thread buffers. The default is 4kw.
1905 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1906 return JNI_EINVAL;
1907 }
1908
1909 // OldPLABSize is the size of the buffers in the old gen that
1910 // UseParallelGC uses to promote live data that doesn't fit in the
1911 // survivor spaces. At any given time, there's one for each gc thread.
1912 // The default size is 1kw. These buffers are rarely used, since the
1913 // survivor spaces are usually big enough. For specjbb, however, there
1914 // are occasions when there's lots of live data in the young gen
1915 // and we end up promoting some of it. We don't have a definite
1916 // explanation for why bumping OldPLABSize helps, but the theory
1917 // is that a bigger PLAB results in retaining something like the
1918 // original allocation order after promotion, which improves mutator
1919 // locality. A minor effect may be that larger PLABs reduce the
1920 // number of PLAB allocation events during gc. The value of 8kw
1921 // was arrived at by experimenting with specjbb.
1922 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1923 return JNI_EINVAL;
1924 }
1925
1926 // Enable parallel GC and adaptive generation sizing
1927 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1928 return JNI_EINVAL;
1929 }
1930
1931 // Encourage steady state memory management
1932 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1933 return JNI_EINVAL;
1934 }
1935
1936 // This appears to improve mutator locality
1937 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1938 return JNI_EINVAL;
1939 }
1940
1941 return JNI_OK;
1942 }
1943
1944 // This must be called after ergonomics.
1945 void Arguments::set_bytecode_flags() {
1946 if (!RewriteBytecodes) {
1947 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1948 }
1949 }
1950
1951 // Aggressive optimization flags
1952 jint Arguments::set_aggressive_opts_flags() {
1953 #ifdef COMPILER2
1954 if (AggressiveUnboxing) {
1955 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1956 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1957 } else if (!EliminateAutoBox) {
1958 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1959 AggressiveUnboxing = false;
1960 }
1961 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1962 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1963 } else if (!DoEscapeAnalysis) {
1964 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1965 AggressiveUnboxing = false;
1966 }
1967 }
1968 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1969 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1970 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1971 }
1972 // Feed the cache size setting into the JDK
1973 char buffer[1024];
1974 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1975 if (!add_property(buffer)) {
1976 return JNI_ENOMEM;
1977 }
1978 }
1979 #endif
1980
1981 return JNI_OK;
1982 }
1983
1984 //===========================================================================================================
1985 // Parsing of java.compiler property
1986
1987 void Arguments::process_java_compiler_argument(const char* arg) {
1988 // For backwards compatibility, Djava.compiler=NONE or ""
1989 // causes us to switch to -Xint mode UNLESS -Xdebug
1990 // is also specified.
1991 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1992 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1993 }
1994 }
1995
1996 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1997 _sun_java_launcher = os::strdup_check_oom(launcher);
1998 }
1999
2000 bool Arguments::created_by_java_launcher() {
2001 assert(_sun_java_launcher != NULL, "property must have value");
2002 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2003 }
2004
2005 bool Arguments::sun_java_launcher_is_altjvm() {
2006 return _sun_java_launcher_is_altjvm;
2007 }
2008
2009 //===========================================================================================================
2010 // Parsing of main arguments
2011
2012 unsigned int addreads_count = 0;
2013 unsigned int addexports_count = 0;
2014 unsigned int addopens_count = 0;
2015 unsigned int addmods_count = 0;
2016 unsigned int patch_mod_count = 0;
2017 unsigned int enable_native_access_count = 0;
2018
2019 // Check the consistency of vm_init_args
2020 bool Arguments::check_vm_args_consistency() {
2021 // Method for adding checks for flag consistency.
2022 // The intent is to warn the user of all possible conflicts,
2023 // before returning an error.
2024 // Note: Needs platform-dependent factoring.
2025 bool status = true;
2026
2027 if (TLABRefillWasteFraction == 0) {
2028 jio_fprintf(defaultStream::error_stream(),
2029 "TLABRefillWasteFraction should be a denominator, "
2030 "not " SIZE_FORMAT "\n",
2031 TLABRefillWasteFraction);
2032 status = false;
2033 }
2034
2035 status = CompilerConfig::check_args_consistency(status);
2036 #if INCLUDE_JVMCI
2037 if (status && EnableJVMCI) {
2038 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2039 AddProperty, UnwriteableProperty, InternalProperty);
2040 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2041 return false;
2042 }
2043 }
2044 #endif
2045
2046 #ifndef SUPPORT_RESERVED_STACK_AREA
2047 if (StackReservedPages != 0) {
2048 FLAG_SET_CMDLINE(StackReservedPages, 0);
2049 warning("Reserved Stack Area not supported on this platform");
2050 }
2051 #endif
2052
2053 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64)
2054 if (UseHeavyMonitors) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "UseHeavyMonitors is not fully implemented on this architecture");
2057 return false;
2058 }
2059 #endif
2060 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
2061 if (UseHeavyMonitors && UseRTMForStackLocks) {
2062 jio_fprintf(defaultStream::error_stream(),
2063 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive");
2064
2065 return false;
2066 }
2067 #endif
2068 if (VerifyHeavyMonitors && !UseHeavyMonitors) {
2069 jio_fprintf(defaultStream::error_stream(),
2070 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors");
2071 return false;
2072 }
2073
2074 return status;
2075 }
2076
2077 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2078 const char* option_type) {
2079 if (ignore) return false;
2080
2081 const char* spacer = " ";
2082 if (option_type == NULL) {
2083 option_type = ++spacer; // Set both to the empty string.
2084 }
2085
2086 jio_fprintf(defaultStream::error_stream(),
2087 "Unrecognized %s%soption: %s\n", option_type, spacer,
2088 option->optionString);
2089 return true;
2090 }
2091
2092 static const char* user_assertion_options[] = {
2093 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2094 };
2095
2096 static const char* system_assertion_options[] = {
2097 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2098 };
2099
2100 bool Arguments::parse_uintx(const char* value,
2101 uintx* uintx_arg,
2102 uintx min_size) {
2103 uintx n;
2104 if (!parse_integer(value, &n)) {
2105 return false;
2106 }
2107 if (n >= min_size) {
2108 *uintx_arg = n;
2109 return true;
2110 } else {
2111 return false;
2112 }
2113 }
2114
2115 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2116 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2117 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2118 char* property = AllocateHeap(prop_len, mtArguments);
2119 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2120 if (ret < 0 || ret >= (int)prop_len) {
2121 FreeHeap(property);
2122 return false;
2123 }
2124 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2125 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2126 // that multiple occurrences of the associated flag just causes the existing property value to be
2127 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2128 // to a property after we have finished flag processing.
2129 bool added = add_property(property, WriteableProperty, internal);
2130 FreeHeap(property);
2131 return added;
2132 }
2133
2134 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2135 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2136 const unsigned int props_count_limit = 1000;
2137 const int max_digits = 3;
2138 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2139
2140 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2141 if (count < props_count_limit) {
2142 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2143 char* property = AllocateHeap(prop_len, mtArguments);
2144 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2145 if (ret < 0 || ret >= (int)prop_len) {
2146 FreeHeap(property);
2147 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2148 return false;
2149 }
2150 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2151 FreeHeap(property);
2152 return added;
2153 }
2154
2155 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2156 return false;
2157 }
2158
2159 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2160 julong* long_arg,
2161 julong min_size,
2162 julong max_size) {
2163 if (!parse_integer(s, long_arg)) return arg_unreadable;
2164 return check_memory_size(*long_arg, min_size, max_size);
2165 }
2166
2167 // Parse JavaVMInitArgs structure
2168
2169 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2170 const JavaVMInitArgs *java_tool_options_args,
2171 const JavaVMInitArgs *java_options_args,
2172 const JavaVMInitArgs *cmd_line_args) {
2173 bool patch_mod_javabase = false;
2174
2175 // Save default settings for some mode flags
2176 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2177 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2178 Arguments::_ClipInlining = ClipInlining;
2179 Arguments::_BackgroundCompilation = BackgroundCompilation;
2180
2181 // Remember the default value of SharedBaseAddress.
2182 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2183
2184 // Setup flags for mixed which is the default
2185 set_mode_flags(_mixed);
2186
2187 // Parse args structure generated from java.base vm options resource
2188 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2189 if (result != JNI_OK) {
2190 return result;
2191 }
2192
2193 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2194 // variable (if present).
2195 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2196 if (result != JNI_OK) {
2197 return result;
2198 }
2199
2200 // Parse args structure generated from the command line flags.
2201 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2202 if (result != JNI_OK) {
2203 return result;
2204 }
2205
2206 // Parse args structure generated from the _JAVA_OPTIONS environment
2207 // variable (if present) (mimics classic VM)
2208 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2209 if (result != JNI_OK) {
2210 return result;
2211 }
2212
2213 // We need to ensure processor and memory resources have been properly
2214 // configured - which may rely on arguments we just processed - before
2215 // doing the final argument processing. Any argument processing that
2216 // needs to know about processor and memory resources must occur after
2217 // this point.
2218
2219 os::init_container_support();
2220
2221 // Do final processing now that all arguments have been parsed
2222 result = finalize_vm_init_args(patch_mod_javabase);
2223 if (result != JNI_OK) {
2224 return result;
2225 }
2226
2227 return JNI_OK;
2228 }
2229
2230 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2231 // represents a valid JDWP agent. is_path==true denotes that we
2232 // are dealing with -agentpath (case where name is a path), otherwise with
2233 // -agentlib
2234 bool valid_jdwp_agent(char *name, bool is_path) {
2235 char *_name;
2236 const char *_jdwp = "jdwp";
2237 size_t _len_jdwp, _len_prefix;
2238
2239 if (is_path) {
2240 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2241 return false;
2242 }
2243
2244 _name++; // skip past last path separator
2245 _len_prefix = strlen(JNI_LIB_PREFIX);
2246
2247 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2248 return false;
2249 }
2250
2251 _name += _len_prefix;
2252 _len_jdwp = strlen(_jdwp);
2253
2254 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2255 _name += _len_jdwp;
2256 }
2257 else {
2258 return false;
2259 }
2260
2261 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2262 return false;
2263 }
2264
2265 return true;
2266 }
2267
2268 if (strcmp(name, _jdwp) == 0) {
2269 return true;
2270 }
2271
2272 return false;
2273 }
2274
2275 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2276 // --patch-module=<module>=<file>(<pathsep><file>)*
2277 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2278 // Find the equal sign between the module name and the path specification
2279 const char* module_equal = strchr(patch_mod_tail, '=');
2280 if (module_equal == NULL) {
2281 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2282 return JNI_ERR;
2283 } else {
2284 // Pick out the module name
2285 size_t module_len = module_equal - patch_mod_tail;
2286 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2287 if (module_name != NULL) {
2288 memcpy(module_name, patch_mod_tail, module_len);
2289 *(module_name + module_len) = '\0';
2290 // The path piece begins one past the module_equal sign
2291 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2292 FREE_C_HEAP_ARRAY(char, module_name);
2293 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2294 return JNI_ENOMEM;
2295 }
2296 } else {
2297 return JNI_ENOMEM;
2298 }
2299 }
2300 return JNI_OK;
2301 }
2302
2303 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2304 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2305 // The min and max sizes match the values in globals.hpp, but scaled
2306 // with K. The values have been chosen so that alignment with page
2307 // size doesn't change the max value, which makes the conversions
2308 // back and forth between Xss value and ThreadStackSize value easier.
2309 // The values have also been chosen to fit inside a 32-bit signed type.
2310 const julong min_ThreadStackSize = 0;
2311 const julong max_ThreadStackSize = 1 * M;
2312
2313 // Make sure the above values match the range set in globals.hpp
2314 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2315 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2316 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2317
2318 const julong min_size = min_ThreadStackSize * K;
2319 const julong max_size = max_ThreadStackSize * K;
2320
2321 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2322
2323 julong size = 0;
2324 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2325 if (errcode != arg_in_range) {
2326 bool silent = (option == NULL); // Allow testing to silence error messages
2327 if (!silent) {
2328 jio_fprintf(defaultStream::error_stream(),
2329 "Invalid thread stack size: %s\n", option->optionString);
2330 describe_range_error(errcode);
2331 }
2332 return JNI_EINVAL;
2333 }
2334
2335 // Internally track ThreadStackSize in units of 1024 bytes.
2336 const julong size_aligned = align_up(size, K);
2337 assert(size <= size_aligned,
2338 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2339 size, size_aligned);
2340
2341 const julong size_in_K = size_aligned / K;
2342 assert(size_in_K < (julong)max_intx,
2343 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2344 size_in_K);
2345
2346 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2347 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2348 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2349 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2350 max_expanded, size_in_K);
2351
2352 *out_ThreadStackSize = (intx)size_in_K;
2353
2354 return JNI_OK;
2355 }
2356
2357 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2358 // For match_option to return remaining or value part of option string
2359 const char* tail;
2360
2361 // iterate over arguments
2362 for (int index = 0; index < args->nOptions; index++) {
2363 bool is_absolute_path = false; // for -agentpath vs -agentlib
2364
2365 const JavaVMOption* option = args->options + index;
2366
2367 if (!match_option(option, "-Djava.class.path", &tail) &&
2368 !match_option(option, "-Dsun.java.command", &tail) &&
2369 !match_option(option, "-Dsun.java.launcher", &tail)) {
2370
2371 // add all jvm options to the jvm_args string. This string
2372 // is used later to set the java.vm.args PerfData string constant.
2373 // the -Djava.class.path and the -Dsun.java.command options are
2374 // omitted from jvm_args string as each have their own PerfData
2375 // string constant object.
2376 build_jvm_args(option->optionString);
2377 }
2378
2379 // -verbose:[class/module/gc/jni]
2380 if (match_option(option, "-verbose", &tail)) {
2381 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2382 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2383 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2384 } else if (!strcmp(tail, ":module")) {
2385 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2386 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2387 } else if (!strcmp(tail, ":gc")) {
2388 if (_legacyGCLogging.lastFlag == 0) {
2389 _legacyGCLogging.lastFlag = 1;
2390 }
2391 } else if (!strcmp(tail, ":jni")) {
2392 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2393 }
2394 // -da / -ea / -disableassertions / -enableassertions
2395 // These accept an optional class/package name separated by a colon, e.g.,
2396 // -da:java.lang.Thread.
2397 } else if (match_option(option, user_assertion_options, &tail, true)) {
2398 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2399 if (*tail == '\0') {
2400 JavaAssertions::setUserClassDefault(enable);
2401 } else {
2402 assert(*tail == ':', "bogus match by match_option()");
2403 JavaAssertions::addOption(tail + 1, enable);
2404 }
2405 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2406 } else if (match_option(option, system_assertion_options, &tail, false)) {
2407 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2408 JavaAssertions::setSystemClassDefault(enable);
2409 // -bootclasspath:
2410 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2411 jio_fprintf(defaultStream::output_stream(),
2412 "-Xbootclasspath is no longer a supported option.\n");
2413 return JNI_EINVAL;
2414 // -bootclasspath/a:
2415 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2416 Arguments::append_sysclasspath(tail);
2417 #if INCLUDE_CDS
2418 MetaspaceShared::disable_optimized_module_handling();
2419 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2420 #endif
2421 // -bootclasspath/p:
2422 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2423 jio_fprintf(defaultStream::output_stream(),
2424 "-Xbootclasspath/p is no longer a supported option.\n");
2425 return JNI_EINVAL;
2426 // -Xrun
2427 } else if (match_option(option, "-Xrun", &tail)) {
2428 if (tail != NULL) {
2429 const char* pos = strchr(tail, ':');
2430 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2431 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2432 jio_snprintf(name, len + 1, "%s", tail);
2433
2434 char *options = NULL;
2435 if(pos != NULL) {
2436 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2437 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2438 }
2439 #if !INCLUDE_JVMTI
2440 if (strcmp(name, "jdwp") == 0) {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Debugging agents are not supported in this VM\n");
2443 return JNI_ERR;
2444 }
2445 #endif // !INCLUDE_JVMTI
2446 add_init_library(name, options);
2447 }
2448 } else if (match_option(option, "--add-reads=", &tail)) {
2449 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2450 return JNI_ENOMEM;
2451 }
2452 } else if (match_option(option, "--add-exports=", &tail)) {
2453 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2454 return JNI_ENOMEM;
2455 }
2456 } else if (match_option(option, "--add-opens=", &tail)) {
2457 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2458 return JNI_ENOMEM;
2459 }
2460 } else if (match_option(option, "--add-modules=", &tail)) {
2461 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2462 return JNI_ENOMEM;
2463 }
2464 } else if (match_option(option, "--enable-native-access=", &tail)) {
2465 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2466 return JNI_ENOMEM;
2467 }
2468 } else if (match_option(option, "--limit-modules=", &tail)) {
2469 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2470 return JNI_ENOMEM;
2471 }
2472 } else if (match_option(option, "--module-path=", &tail)) {
2473 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2474 return JNI_ENOMEM;
2475 }
2476 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2477 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2478 return JNI_ENOMEM;
2479 }
2480 } else if (match_option(option, "--patch-module=", &tail)) {
2481 // --patch-module=<module>=<file>(<pathsep><file>)*
2482 int res = process_patch_mod_option(tail, patch_mod_javabase);
2483 if (res != JNI_OK) {
2484 return res;
2485 }
2486 } else if (match_option(option, "--illegal-access=", &tail)) {
2487 char version[256];
2488 JDK_Version::jdk(17).to_string(version, sizeof(version));
2489 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2490 // -agentlib and -agentpath
2491 } else if (match_option(option, "-agentlib:", &tail) ||
2492 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2493 if(tail != NULL) {
2494 const char* pos = strchr(tail, '=');
2495 char* name;
2496 if (pos == NULL) {
2497 name = os::strdup_check_oom(tail, mtArguments);
2498 } else {
2499 size_t len = pos - tail;
2500 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2501 memcpy(name, tail, len);
2502 name[len] = '\0';
2503 }
2504
2505 char *options = NULL;
2506 if(pos != NULL) {
2507 options = os::strdup_check_oom(pos + 1, mtArguments);
2508 }
2509 #if !INCLUDE_JVMTI
2510 if (valid_jdwp_agent(name, is_absolute_path)) {
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Debugging agents are not supported in this VM\n");
2513 return JNI_ERR;
2514 }
2515 #endif // !INCLUDE_JVMTI
2516 add_init_agent(name, options, is_absolute_path);
2517 }
2518 // -javaagent
2519 } else if (match_option(option, "-javaagent:", &tail)) {
2520 #if !INCLUDE_JVMTI
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Instrumentation agents are not supported in this VM\n");
2523 return JNI_ERR;
2524 #else
2525 if (tail != NULL) {
2526 size_t length = strlen(tail) + 1;
2527 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2528 jio_snprintf(options, length, "%s", tail);
2529 add_instrument_agent("instrument", options, false);
2530 // java agents need module java.instrument
2531 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2532 return JNI_ENOMEM;
2533 }
2534 }
2535 #endif // !INCLUDE_JVMTI
2536 // --enable_preview
2537 } else if (match_option(option, "--enable-preview")) {
2538 set_enable_preview();
2539 // -Xnoclassgc
2540 } else if (match_option(option, "-Xnoclassgc")) {
2541 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2542 return JNI_EINVAL;
2543 }
2544 // -Xbatch
2545 } else if (match_option(option, "-Xbatch")) {
2546 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2547 return JNI_EINVAL;
2548 }
2549 // -Xmn for compatibility with other JVM vendors
2550 } else if (match_option(option, "-Xmn", &tail)) {
2551 julong long_initial_young_size = 0;
2552 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2553 if (errcode != arg_in_range) {
2554 jio_fprintf(defaultStream::error_stream(),
2555 "Invalid initial young generation size: %s\n", option->optionString);
2556 describe_range_error(errcode);
2557 return JNI_EINVAL;
2558 }
2559 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2563 return JNI_EINVAL;
2564 }
2565 // -Xms
2566 } else if (match_option(option, "-Xms", &tail)) {
2567 julong size = 0;
2568 // an initial heap size of 0 means automatically determine
2569 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2570 if (errcode != arg_in_range) {
2571 jio_fprintf(defaultStream::error_stream(),
2572 "Invalid initial heap size: %s\n", option->optionString);
2573 describe_range_error(errcode);
2574 return JNI_EINVAL;
2575 }
2576 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2577 return JNI_EINVAL;
2578 }
2579 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2580 return JNI_EINVAL;
2581 }
2582 // -Xmx
2583 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2584 julong long_max_heap_size = 0;
2585 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2586 if (errcode != arg_in_range) {
2587 jio_fprintf(defaultStream::error_stream(),
2588 "Invalid maximum heap size: %s\n", option->optionString);
2589 describe_range_error(errcode);
2590 return JNI_EINVAL;
2591 }
2592 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2593 return JNI_EINVAL;
2594 }
2595 // Xmaxf
2596 } else if (match_option(option, "-Xmaxf", &tail)) {
2597 char* err;
2598 int maxf = (int)(strtod(tail, &err) * 100);
2599 if (*err != '\0' || *tail == '\0') {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Bad max heap free percentage size: %s\n",
2602 option->optionString);
2603 return JNI_EINVAL;
2604 } else {
2605 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 }
2609 // Xminf
2610 } else if (match_option(option, "-Xminf", &tail)) {
2611 char* err;
2612 int minf = (int)(strtod(tail, &err) * 100);
2613 if (*err != '\0' || *tail == '\0') {
2614 jio_fprintf(defaultStream::error_stream(),
2615 "Bad min heap free percentage size: %s\n",
2616 option->optionString);
2617 return JNI_EINVAL;
2618 } else {
2619 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 }
2623 // -Xss
2624 } else if (match_option(option, "-Xss", &tail)) {
2625 intx value = 0;
2626 jint err = parse_xss(option, tail, &value);
2627 if (err != JNI_OK) {
2628 return err;
2629 }
2630 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2634 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2635 julong long_ReservedCodeCacheSize = 0;
2636
2637 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2638 if (errcode != arg_in_range) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "Invalid maximum code cache size: %s.\n", option->optionString);
2641 return JNI_EINVAL;
2642 }
2643 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 // -green
2647 } else if (match_option(option, "-green")) {
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Green threads support not available\n");
2650 return JNI_EINVAL;
2651 // -native
2652 } else if (match_option(option, "-native")) {
2653 // HotSpot always uses native threads, ignore silently for compatibility
2654 // -Xrs
2655 } else if (match_option(option, "-Xrs")) {
2656 // Classic/EVM option, new functionality
2657 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 // -Xprof
2661 } else if (match_option(option, "-Xprof")) {
2662 char version[256];
2663 // Obsolete in JDK 10
2664 JDK_Version::jdk(10).to_string(version, sizeof(version));
2665 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2666 // -Xinternalversion
2667 } else if (match_option(option, "-Xinternalversion")) {
2668 jio_fprintf(defaultStream::output_stream(), "%s\n",
2669 VM_Version::internal_vm_info_string());
2670 vm_exit(0);
2671 #ifndef PRODUCT
2672 // -Xprintflags
2673 } else if (match_option(option, "-Xprintflags")) {
2674 JVMFlag::printFlags(tty, false);
2675 vm_exit(0);
2676 #endif
2677 // -D
2678 } else if (match_option(option, "-D", &tail)) {
2679 const char* value;
2680 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2681 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2682 // abort if -Djava.endorsed.dirs is set
2683 jio_fprintf(defaultStream::output_stream(),
2684 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2685 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2686 return JNI_EINVAL;
2687 }
2688 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2689 *value != '\0' && strcmp(value, "\"\"") != 0) {
2690 // abort if -Djava.ext.dirs is set
2691 jio_fprintf(defaultStream::output_stream(),
2692 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2693 return JNI_EINVAL;
2694 }
2695 // Check for module related properties. They must be set using the modules
2696 // options. For example: use "--add-modules=java.sql", not
2697 // "-Djdk.module.addmods=java.sql"
2698 if (is_internal_module_property(option->optionString + 2)) {
2699 needs_module_property_warning = true;
2700 continue;
2701 }
2702 if (!add_property(tail)) {
2703 return JNI_ENOMEM;
2704 }
2705 // Out of the box management support
2706 if (match_option(option, "-Dcom.sun.management", &tail)) {
2707 #if INCLUDE_MANAGEMENT
2708 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 // management agent in module jdk.management.agent
2712 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2713 return JNI_ENOMEM;
2714 }
2715 #else
2716 jio_fprintf(defaultStream::output_stream(),
2717 "-Dcom.sun.management is not supported in this VM.\n");
2718 return JNI_ERR;
2719 #endif
2720 }
2721 // -Xint
2722 } else if (match_option(option, "-Xint")) {
2723 set_mode_flags(_int);
2724 // -Xmixed
2725 } else if (match_option(option, "-Xmixed")) {
2726 set_mode_flags(_mixed);
2727 // -Xcomp
2728 } else if (match_option(option, "-Xcomp")) {
2729 // for testing the compiler; turn off all flags that inhibit compilation
2730 set_mode_flags(_comp);
2731 // -Xshare:dump
2732 } else if (match_option(option, "-Xshare:dump")) {
2733 DumpSharedSpaces = true;
2734 // -Xshare:on
2735 } else if (match_option(option, "-Xshare:on")) {
2736 UseSharedSpaces = true;
2737 RequireSharedSpaces = true;
2738 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2739 } else if (match_option(option, "-Xshare:auto")) {
2740 UseSharedSpaces = true;
2741 RequireSharedSpaces = false;
2742 xshare_auto_cmd_line = true;
2743 // -Xshare:off
2744 } else if (match_option(option, "-Xshare:off")) {
2745 UseSharedSpaces = false;
2746 RequireSharedSpaces = false;
2747 // -Xverify
2748 } else if (match_option(option, "-Xverify", &tail)) {
2749 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2750 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 } else if (strcmp(tail, ":remote") == 0) {
2757 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 } else if (strcmp(tail, ":none") == 0) {
2764 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2765 return JNI_EINVAL;
2766 }
2767 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2771 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2772 return JNI_EINVAL;
2773 }
2774 // -Xdebug
2775 } else if (match_option(option, "-Xdebug")) {
2776 // note this flag has been used, then ignore
2777 set_xdebug_mode(true);
2778 // -Xnoagent
2779 } else if (match_option(option, "-Xnoagent")) {
2780 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2781 } else if (match_option(option, "-Xloggc:", &tail)) {
2782 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2783 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2784 _legacyGCLogging.lastFlag = 2;
2785 _legacyGCLogging.file = os::strdup_check_oom(tail);
2786 } else if (match_option(option, "-Xlog", &tail)) {
2787 bool ret = false;
2788 if (strcmp(tail, ":help") == 0) {
2789 fileStream stream(defaultStream::output_stream());
2790 LogConfiguration::print_command_line_help(&stream);
2791 vm_exit(0);
2792 } else if (strcmp(tail, ":disable") == 0) {
2793 LogConfiguration::disable_logging();
2794 ret = true;
2795 } else if (strcmp(tail, ":async") == 0) {
2796 LogConfiguration::set_async_mode(true);
2797 ret = true;
2798 } else if (*tail == '\0') {
2799 ret = LogConfiguration::parse_command_line_arguments();
2800 assert(ret, "-Xlog without arguments should never fail to parse");
2801 } else if (*tail == ':') {
2802 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2803 }
2804 if (ret == false) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2807 tail);
2808 return JNI_EINVAL;
2809 }
2810 // JNI hooks
2811 } else if (match_option(option, "-Xcheck", &tail)) {
2812 if (!strcmp(tail, ":jni")) {
2813 #if !INCLUDE_JNI_CHECK
2814 warning("JNI CHECKING is not supported in this VM");
2815 #else
2816 CheckJNICalls = true;
2817 #endif // INCLUDE_JNI_CHECK
2818 } else if (is_bad_option(option, args->ignoreUnrecognized,
2819 "check")) {
2820 return JNI_EINVAL;
2821 }
2822 } else if (match_option(option, "vfprintf")) {
2823 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2824 } else if (match_option(option, "exit")) {
2825 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2826 } else if (match_option(option, "abort")) {
2827 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2828 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2829 // and the last option wins.
2830 } else if (match_option(option, "-XX:+NeverTenure")) {
2831 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2838 return JNI_EINVAL;
2839 }
2840 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2841 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2845 return JNI_EINVAL;
2846 }
2847 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2851 uintx max_tenuring_thresh = 0;
2852 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2853 jio_fprintf(defaultStream::error_stream(),
2854 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2855 return JNI_EINVAL;
2856 }
2857
2858 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861
2862 if (MaxTenuringThreshold == 0) {
2863 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 } else {
2870 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2874 return JNI_EINVAL;
2875 }
2876 }
2877 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2878 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2885 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2892 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2899 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 } else if (match_option(option, "--finalization=", &tail)) {
2906 if (strcmp(tail, "enabled") == 0) {
2907 InstanceKlass::set_finalization_enabled(true);
2908 } else if (strcmp(tail, "disabled") == 0) {
2909 InstanceKlass::set_finalization_enabled(false);
2910 } else {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2913 tail);
2914 return JNI_EINVAL;
2915 }
2916 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2917 #if defined(DTRACE_ENABLED)
2918 warning("Option ExtendedDTraceProbes was deprecated in version 19 and will likely be removed in a future release.");
2919 warning("Use the combination of -XX:+DTraceMethodProbes, -XX:+DTraceAllocProbes and -XX:+DTraceMonitorProbes instead.");
2920 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 #else // defined(DTRACE_ENABLED)
2933 jio_fprintf(defaultStream::error_stream(),
2934 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2935 return JNI_EINVAL;
2936 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2937 jio_fprintf(defaultStream::error_stream(),
2938 "DTraceMethodProbes flag is not applicable for this configuration\n");
2939 return JNI_EINVAL;
2940 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "DTraceAllocProbes flag is not applicable for this configuration\n");
2943 return JNI_EINVAL;
2944 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2945 jio_fprintf(defaultStream::error_stream(),
2946 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2947 return JNI_EINVAL;
2948 #endif // defined(DTRACE_ENABLED)
2949 #ifdef ASSERT
2950 } else if (match_option(option, "-XX:+FullGCALot")) {
2951 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 // disable scavenge before parallel mark-compact
2955 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 #endif
2959 #if !INCLUDE_MANAGEMENT
2960 } else if (match_option(option, "-XX:+ManagementServer")) {
2961 jio_fprintf(defaultStream::error_stream(),
2962 "ManagementServer is not supported in this VM.\n");
2963 return JNI_ERR;
2964 #endif // INCLUDE_MANAGEMENT
2965 #if INCLUDE_JVMCI
2966 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2967 if (EnableJVMCIProduct) {
2968 jio_fprintf(defaultStream::error_stream(),
2969 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2970 return JNI_EINVAL;
2971 }
2972 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2973 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2974 if (EnableJVMCIProduct) {
2975 continue;
2976 }
2977 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2978 // Allow this flag if it has been unlocked.
2979 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2980 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Unable to enable JVMCI in product mode");
2983 return JNI_ERR;
2984 }
2985 }
2986 // The flag was locked so process normally to report that error
2987 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2988 return JNI_EINVAL;
2989 }
2990 #endif // INCLUDE_JVMCI
2991 #if INCLUDE_JFR
2992 } else if (match_jfr_option(&option)) {
2993 return JNI_EINVAL;
2994 #endif
2995 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2996 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2997 // already been handled
2998 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2999 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3000 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3001 return JNI_EINVAL;
3002 }
3003 }
3004 // Unknown option
3005 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3006 return JNI_ERR;
3007 }
3008 }
3009
3010 // PrintSharedArchiveAndExit will turn on
3011 // -Xshare:on
3012 // -Xlog:class+path=info
3013 if (PrintSharedArchiveAndExit) {
3014 UseSharedSpaces = true;
3015 RequireSharedSpaces = true;
3016 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3017 }
3018
3019 fix_appclasspath();
3020
3021 return JNI_OK;
3022 }
3023
3024 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3025 // For java.base check for duplicate --patch-module options being specified on the command line.
3026 // This check is only required for java.base, all other duplicate module specifications
3027 // will be checked during module system initialization. The module system initialization
3028 // will throw an ExceptionInInitializerError if this situation occurs.
3029 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3030 if (*patch_mod_javabase) {
3031 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3032 } else {
3033 *patch_mod_javabase = true;
3034 }
3035 }
3036
3037 // Create GrowableArray lazily, only if --patch-module has been specified
3038 if (_patch_mod_prefix == NULL) {
3039 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
3040 }
3041
3042 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3043 }
3044
3045 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3046 //
3047 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3048 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3049 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3050 // path is treated as the current directory.
3051 //
3052 // This causes problems with CDS, which requires that all directories specified in the classpath
3053 // must be empty. In most cases, applications do NOT want to load classes from the current
3054 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3055 // scripts compatible with CDS.
3056 void Arguments::fix_appclasspath() {
3057 if (IgnoreEmptyClassPaths) {
3058 const char separator = *os::path_separator();
3059 const char* src = _java_class_path->value();
3060
3061 // skip over all the leading empty paths
3062 while (*src == separator) {
3063 src ++;
3064 }
3065
3066 char* copy = os::strdup_check_oom(src, mtArguments);
3067
3068 // trim all trailing empty paths
3069 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3070 *tail = '\0';
3071 }
3072
3073 char from[3] = {separator, separator, '\0'};
3074 char to [2] = {separator, '\0'};
3075 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3076 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3077 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3078 }
3079
3080 _java_class_path->set_writeable_value(copy);
3081 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3082 }
3083 }
3084
3085 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3086 // check if the default lib/endorsed directory exists; if so, error
3087 char path[JVM_MAXPATHLEN];
3088 const char* fileSep = os::file_separator();
3089 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3090
3091 DIR* dir = os::opendir(path);
3092 if (dir != NULL) {
3093 jio_fprintf(defaultStream::output_stream(),
3094 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3095 "in modular form will be supported via the concept of upgradeable modules.\n");
3096 os::closedir(dir);
3097 return JNI_ERR;
3098 }
3099
3100 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3101 dir = os::opendir(path);
3102 if (dir != NULL) {
3103 jio_fprintf(defaultStream::output_stream(),
3104 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3105 "Use -classpath instead.\n.");
3106 os::closedir(dir);
3107 return JNI_ERR;
3108 }
3109
3110 // This must be done after all arguments have been processed
3111 // and the container support has been initialized since AggressiveHeap
3112 // relies on the amount of total memory available.
3113 if (AggressiveHeap) {
3114 jint result = set_aggressive_heap_flags();
3115 if (result != JNI_OK) {
3116 return result;
3117 }
3118 }
3119
3120 // This must be done after all arguments have been processed.
3121 // java_compiler() true means set to "NONE" or empty.
3122 if (java_compiler() && !xdebug_mode()) {
3123 // For backwards compatibility, we switch to interpreted mode if
3124 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3125 // not specified.
3126 set_mode_flags(_int);
3127 }
3128
3129 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3130 // but like -Xint, leave compilation thresholds unaffected.
3131 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3132 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3133 set_mode_flags(_int);
3134 }
3135
3136 #ifdef ZERO
3137 // Zero always runs in interpreted mode
3138 set_mode_flags(_int);
3139 #endif
3140
3141 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3142 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3143 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3144 }
3145
3146 #if !COMPILER2_OR_JVMCI
3147 // Don't degrade server performance for footprint
3148 if (FLAG_IS_DEFAULT(UseLargePages) &&
3149 MaxHeapSize < LargePageHeapSizeThreshold) {
3150 // No need for large granularity pages w/small heaps.
3151 // Note that large pages are enabled/disabled for both the
3152 // Java heap and the code cache.
3153 FLAG_SET_DEFAULT(UseLargePages, false);
3154 }
3155
3156 UNSUPPORTED_OPTION(ProfileInterpreter);
3157 #endif
3158
3159 // Parse the CompilationMode flag
3160 if (!CompilationModeFlag::initialize()) {
3161 return JNI_ERR;
3162 }
3163
3164 if (!check_vm_args_consistency()) {
3165 return JNI_ERR;
3166 }
3167
3168 #if INCLUDE_CDS
3169 if (DumpSharedSpaces) {
3170 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3171 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3172 // compiler just to be safe.
3173 //
3174 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3175 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3176 // TODO: revisit the following for the static archive case.
3177 set_mode_flags(_int);
3178 }
3179
3180 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3181 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3182 jio_fprintf(defaultStream::output_stream(),
3183 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3184 return JNI_ERR;
3185 }
3186
3187 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3188 DynamicDumpSharedSpaces = false;
3189 } else {
3190 DynamicDumpSharedSpaces = true;
3191 }
3192
3193 if (AutoCreateSharedArchive) {
3194 if (SharedArchiveFile == NULL) {
3195 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3196 return JNI_ERR;
3197 }
3198 if (ArchiveClassesAtExit != NULL) {
3199 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3200 return JNI_ERR;
3201 }
3202 }
3203
3204 if (UseSharedSpaces && patch_mod_javabase) {
3205 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3206 }
3207 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3208 UseSharedSpaces = false;
3209 }
3210
3211 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3212 // Always verify non-system classes during CDS dump
3213 if (!BytecodeVerificationRemote) {
3214 BytecodeVerificationRemote = true;
3215 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3216 }
3217 }
3218 #endif
3219
3220 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3221 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3222 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3223
3224 return JNI_OK;
3225 }
3226
3227 // Helper class for controlling the lifetime of JavaVMInitArgs
3228 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3229 // deleted on the destruction of the ScopedVMInitArgs object.
3230 class ScopedVMInitArgs : public StackObj {
3231 private:
3232 JavaVMInitArgs _args;
3233 char* _container_name;
3234 bool _is_set;
3235 char* _vm_options_file_arg;
3236
3237 public:
3238 ScopedVMInitArgs(const char *container_name) {
3239 _args.version = JNI_VERSION_1_2;
3240 _args.nOptions = 0;
3241 _args.options = NULL;
3242 _args.ignoreUnrecognized = false;
3243 _container_name = (char *)container_name;
3244 _is_set = false;
3245 _vm_options_file_arg = NULL;
3246 }
3247
3248 // Populates the JavaVMInitArgs object represented by this
3249 // ScopedVMInitArgs object with the arguments in options. The
3250 // allocated memory is deleted by the destructor. If this method
3251 // returns anything other than JNI_OK, then this object is in a
3252 // partially constructed state, and should be abandoned.
3253 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3254 _is_set = true;
3255 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3256 JavaVMOption, options->length(), mtArguments);
3257 if (options_arr == NULL) {
3258 return JNI_ENOMEM;
3259 }
3260 _args.options = options_arr;
3261
3262 for (int i = 0; i < options->length(); i++) {
3263 options_arr[i] = options->at(i);
3264 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3265 if (options_arr[i].optionString == NULL) {
3266 // Rely on the destructor to do cleanup.
3267 _args.nOptions = i;
3268 return JNI_ENOMEM;
3269 }
3270 }
3271
3272 _args.nOptions = options->length();
3273 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3274 return JNI_OK;
3275 }
3276
3277 JavaVMInitArgs* get() { return &_args; }
3278 char* container_name() { return _container_name; }
3279 bool is_set() { return _is_set; }
3280 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3281 char* vm_options_file_arg() { return _vm_options_file_arg; }
3282
3283 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3284 if (_vm_options_file_arg != NULL) {
3285 os::free(_vm_options_file_arg);
3286 }
3287 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3288 }
3289
3290 ~ScopedVMInitArgs() {
3291 if (_vm_options_file_arg != NULL) {
3292 os::free(_vm_options_file_arg);
3293 }
3294 if (_args.options == NULL) return;
3295 for (int i = 0; i < _args.nOptions; i++) {
3296 os::free(_args.options[i].optionString);
3297 }
3298 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3299 }
3300
3301 // Insert options into this option list, to replace option at
3302 // vm_options_file_pos (-XX:VMOptionsFile)
3303 jint insert(const JavaVMInitArgs* args,
3304 const JavaVMInitArgs* args_to_insert,
3305 const int vm_options_file_pos) {
3306 assert(_args.options == NULL, "shouldn't be set yet");
3307 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3308 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3309
3310 int length = args->nOptions + args_to_insert->nOptions - 1;
3311 // Construct new option array
3312 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3313 for (int i = 0; i < args->nOptions; i++) {
3314 if (i == vm_options_file_pos) {
3315 // insert the new options starting at the same place as the
3316 // -XX:VMOptionsFile option
3317 for (int j = 0; j < args_to_insert->nOptions; j++) {
3318 options.push(args_to_insert->options[j]);
3319 }
3320 } else {
3321 options.push(args->options[i]);
3322 }
3323 }
3324 // make into options array
3325 return set_args(&options);
3326 }
3327 };
3328
3329 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3330 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3331 }
3332
3333 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3334 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3335 }
3336
3337 jint Arguments::parse_options_environment_variable(const char* name,
3338 ScopedVMInitArgs* vm_args) {
3339 char *buffer = ::getenv(name);
3340
3341 // Don't check this environment variable if user has special privileges
3342 // (e.g. unix su command).
3343 if (buffer == NULL || os::have_special_privileges()) {
3344 return JNI_OK;
3345 }
3346
3347 if ((buffer = os::strdup(buffer)) == NULL) {
3348 return JNI_ENOMEM;
3349 }
3350
3351 jio_fprintf(defaultStream::error_stream(),
3352 "Picked up %s: %s\n", name, buffer);
3353
3354 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3355
3356 os::free(buffer);
3357 return retcode;
3358 }
3359
3360 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3361 // read file into buffer
3362 int fd = ::open(file_name, O_RDONLY);
3363 if (fd < 0) {
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Could not open options file '%s'\n",
3366 file_name);
3367 return JNI_ERR;
3368 }
3369
3370 struct stat stbuf;
3371 int retcode = os::stat(file_name, &stbuf);
3372 if (retcode != 0) {
3373 jio_fprintf(defaultStream::error_stream(),
3374 "Could not stat options file '%s'\n",
3375 file_name);
3376 ::close(fd);
3377 return JNI_ERR;
3378 }
3379
3380 if (stbuf.st_size == 0) {
3381 // tell caller there is no option data and that is ok
3382 ::close(fd);
3383 return JNI_OK;
3384 }
3385
3386 // '+ 1' for NULL termination even with max bytes
3387 size_t bytes_alloc = stbuf.st_size + 1;
3388
3389 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3390 if (NULL == buf) {
3391 jio_fprintf(defaultStream::error_stream(),
3392 "Could not allocate read buffer for options file parse\n");
3393 ::close(fd);
3394 return JNI_ENOMEM;
3395 }
3396
3397 memset(buf, 0, bytes_alloc);
3398
3399 // Fill buffer
3400 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3401 ::close(fd);
3402 if (bytes_read < 0) {
3403 FREE_C_HEAP_ARRAY(char, buf);
3404 jio_fprintf(defaultStream::error_stream(),
3405 "Could not read options file '%s'\n", file_name);
3406 return JNI_ERR;
3407 }
3408
3409 if (bytes_read == 0) {
3410 // tell caller there is no option data and that is ok
3411 FREE_C_HEAP_ARRAY(char, buf);
3412 return JNI_OK;
3413 }
3414
3415 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3416
3417 FREE_C_HEAP_ARRAY(char, buf);
3418 return retcode;
3419 }
3420
3421 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3422 // Construct option array
3423 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3424
3425 // some pointers to help with parsing
3426 char *buffer_end = buffer + buf_len;
3427 char *opt_hd = buffer;
3428 char *wrt = buffer;
3429 char *rd = buffer;
3430
3431 // parse all options
3432 while (rd < buffer_end) {
3433 // skip leading white space from the input string
3434 while (rd < buffer_end && isspace(*rd)) {
3435 rd++;
3436 }
3437
3438 if (rd >= buffer_end) {
3439 break;
3440 }
3441
3442 // Remember this is where we found the head of the token.
3443 opt_hd = wrt;
3444
3445 // Tokens are strings of non white space characters separated
3446 // by one or more white spaces.
3447 while (rd < buffer_end && !isspace(*rd)) {
3448 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3449 int quote = *rd; // matching quote to look for
3450 rd++; // don't copy open quote
3451 while (rd < buffer_end && *rd != quote) {
3452 // include everything (even spaces)
3453 // up until the close quote
3454 *wrt++ = *rd++; // copy to option string
3455 }
3456
3457 if (rd < buffer_end) {
3458 rd++; // don't copy close quote
3459 } else {
3460 // did not see closing quote
3461 jio_fprintf(defaultStream::error_stream(),
3462 "Unmatched quote in %s\n", name);
3463 return JNI_ERR;
3464 }
3465 } else {
3466 *wrt++ = *rd++; // copy to option string
3467 }
3468 }
3469
3470 // steal a white space character and set it to NULL
3471 *wrt++ = '\0';
3472 // We now have a complete token
3473
3474 JavaVMOption option;
3475 option.optionString = opt_hd;
3476 option.extraInfo = NULL;
3477
3478 options.append(option); // Fill in option
3479
3480 rd++; // Advance to next character
3481 }
3482
3483 // Fill out JavaVMInitArgs structure.
3484 return vm_args->set_args(&options);
3485 }
3486
3487 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3488 if (DumpSharedSpaces) {
3489 if (RequireSharedSpaces) {
3490 warning("Cannot dump shared archive while using shared archive");
3491 }
3492 UseSharedSpaces = false;
3493 }
3494 #if INCLUDE_CDS
3495 // Initialize shared archive paths which could include both base and dynamic archive paths
3496 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3497 //
3498 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3499 if (DumpSharedSpaces || UseSharedSpaces) {
3500 init_shared_archive_paths();
3501 }
3502 #endif // INCLUDE_CDS
3503 }
3504
3505 #if INCLUDE_CDS
3506 // Sharing support
3507 // Construct the path to the archive
3508 char* Arguments::get_default_shared_archive_path() {
3509 char *default_archive_path;
3510 char jvm_path[JVM_MAXPATHLEN];
3511 os::jvm_path(jvm_path, sizeof(jvm_path));
3512 char *end = strrchr(jvm_path, *os::file_separator());
3513 if (end != NULL) *end = '\0';
3514 size_t jvm_path_len = strlen(jvm_path);
3515 size_t file_sep_len = strlen(os::file_separator());
3516 const size_t len = jvm_path_len + file_sep_len + 20;
3517 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3518 jio_snprintf(default_archive_path, len,
3519 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3520 jvm_path, os::file_separator());
3521 return default_archive_path;
3522 }
3523
3524 int Arguments::num_archives(const char* archive_path) {
3525 if (archive_path == NULL) {
3526 return 0;
3527 }
3528 int npaths = 1;
3529 char* p = (char*)archive_path;
3530 while (*p != '\0') {
3531 if (*p == os::path_separator()[0]) {
3532 npaths++;
3533 }
3534 p++;
3535 }
3536 return npaths;
3537 }
3538
3539 void Arguments::extract_shared_archive_paths(const char* archive_path,
3540 char** base_archive_path,
3541 char** top_archive_path) {
3542 char* begin_ptr = (char*)archive_path;
3543 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3544 if (end_ptr == NULL || end_ptr == begin_ptr) {
3545 vm_exit_during_initialization("Base archive was not specified", archive_path);
3546 }
3547 size_t len = end_ptr - begin_ptr;
3548 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3549 strncpy(cur_path, begin_ptr, len);
3550 cur_path[len] = '\0';
3551 *base_archive_path = cur_path;
3552
3553 begin_ptr = ++end_ptr;
3554 if (*begin_ptr == '\0') {
3555 vm_exit_during_initialization("Top archive was not specified", archive_path);
3556 }
3557 end_ptr = strchr(begin_ptr, '\0');
3558 assert(end_ptr != NULL, "sanity");
3559 len = end_ptr - begin_ptr;
3560 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3561 strncpy(cur_path, begin_ptr, len + 1);
3562 *top_archive_path = cur_path;
3563 }
3564
3565 void Arguments::init_shared_archive_paths() {
3566 if (ArchiveClassesAtExit != nullptr) {
3567 assert(!RecordDynamicDumpInfo, "already checked");
3568 if (DumpSharedSpaces) {
3569 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3570 }
3571 check_unsupported_dumping_properties();
3572
3573 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3574 vm_exit_during_initialization(
3575 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3576 }
3577 }
3578
3579 if (SharedArchiveFile == nullptr) {
3580 SharedArchivePath = get_default_shared_archive_path();
3581 } else {
3582 int archives = num_archives(SharedArchiveFile);
3583 assert(archives > 0, "must be");
3584
3585 if (is_dumping_archive() && archives > 1) {
3586 vm_exit_during_initialization(
3587 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3588 }
3589
3590 if (DumpSharedSpaces) {
3591 assert(archives == 1, "must be");
3592 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3593 // will be overwritten no matter regardless of its contents
3594 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3595 } else {
3596 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3597 // is read from top.jsa
3598 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3599 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3600 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3601 //
3602 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3603 // allow cases (b) and (c). Case (b) is already checked above.
3604
3605 if (archives > 2) {
3606 vm_exit_during_initialization(
3607 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3608 }
3609 if (archives == 1) {
3610 char* base_archive_path = NULL;
3611 bool success =
3612 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3613 if (!success) {
3614 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3615 // regenerate the dynamic archive base on default archive.
3616 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3617 DynamicDumpSharedSpaces = true;
3618 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3619 SharedArchivePath = get_default_shared_archive_path();
3620 SharedArchiveFile = nullptr;
3621 } else {
3622 if (AutoCreateSharedArchive) {
3623 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3624 AutoCreateSharedArchive = false;
3625 }
3626 no_shared_spaces("invalid archive");
3627 }
3628 } else if (base_archive_path == NULL) {
3629 // User has specified a single archive, which is a static archive.
3630 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3631 } else {
3632 // User has specified a single archive, which is a dynamic archive.
3633 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3634 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3635 }
3636 } else {
3637 extract_shared_archive_paths((const char*)SharedArchiveFile,
3638 &SharedArchivePath, &SharedDynamicArchivePath);
3639 if (SharedArchivePath == NULL) {
3640 assert(SharedDynamicArchivePath == NULL, "must be");
3641 no_shared_spaces("invalid archive");
3642 }
3643 }
3644
3645 if (SharedDynamicArchivePath != nullptr) {
3646 // Check for case (c)
3647 if (RecordDynamicDumpInfo) {
3648 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3649 SharedArchiveFile);
3650 }
3651 if (ArchiveClassesAtExit != nullptr) {
3652 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3653 SharedArchiveFile);
3654 }
3655 }
3656
3657 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3658 vm_exit_during_initialization(
3659 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3660 SharedArchiveFile);
3661 }
3662 }
3663 }
3664 }
3665 #endif // INCLUDE_CDS
3666
3667 #ifndef PRODUCT
3668 // Determine whether LogVMOutput should be implicitly turned on.
3669 static bool use_vm_log() {
3670 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3671 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3672 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3673 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3674 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3675 return true;
3676 }
3677
3678 #ifdef COMPILER1
3679 if (PrintC1Statistics) {
3680 return true;
3681 }
3682 #endif // COMPILER1
3683
3684 #ifdef COMPILER2
3685 if (PrintOptoAssembly || PrintOptoStatistics) {
3686 return true;
3687 }
3688 #endif // COMPILER2
3689
3690 return false;
3691 }
3692
3693 #endif // PRODUCT
3694
3695 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3696 for (int index = 0; index < args->nOptions; index++) {
3697 const JavaVMOption* option = args->options + index;
3698 const char* tail;
3699 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3700 return true;
3701 }
3702 }
3703 return false;
3704 }
3705
3706 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3707 const char* vm_options_file,
3708 const int vm_options_file_pos,
3709 ScopedVMInitArgs* vm_options_file_args,
3710 ScopedVMInitArgs* args_out) {
3711 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3712 if (code != JNI_OK) {
3713 return code;
3714 }
3715
3716 if (vm_options_file_args->get()->nOptions < 1) {
3717 return JNI_OK;
3718 }
3719
3720 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3721 jio_fprintf(defaultStream::error_stream(),
3722 "A VM options file may not refer to a VM options file. "
3723 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3724 "options file '%s' in options container '%s' is an error.\n",
3725 vm_options_file_args->vm_options_file_arg(),
3726 vm_options_file_args->container_name());
3727 return JNI_EINVAL;
3728 }
3729
3730 return args_out->insert(args, vm_options_file_args->get(),
3731 vm_options_file_pos);
3732 }
3733
3734 // Expand -XX:VMOptionsFile found in args_in as needed.
3735 // mod_args and args_out parameters may return values as needed.
3736 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3737 ScopedVMInitArgs* mod_args,
3738 JavaVMInitArgs** args_out) {
3739 jint code = match_special_option_and_act(args_in, mod_args);
3740 if (code != JNI_OK) {
3741 return code;
3742 }
3743
3744 if (mod_args->is_set()) {
3745 // args_in contains -XX:VMOptionsFile and mod_args contains the
3746 // original options from args_in along with the options expanded
3747 // from the VMOptionsFile. Return a short-hand to the caller.
3748 *args_out = mod_args->get();
3749 } else {
3750 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3751 }
3752 return JNI_OK;
3753 }
3754
3755 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3756 ScopedVMInitArgs* args_out) {
3757 // Remaining part of option string
3758 const char* tail;
3759 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3760
3761 for (int index = 0; index < args->nOptions; index++) {
3762 const JavaVMOption* option = args->options + index;
3763 if (match_option(option, "-XX:Flags=", &tail)) {
3764 Arguments::set_jvm_flags_file(tail);
3765 continue;
3766 }
3767 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3768 if (vm_options_file_args.found_vm_options_file_arg()) {
3769 jio_fprintf(defaultStream::error_stream(),
3770 "The option '%s' is already specified in the options "
3771 "container '%s' so the specification of '%s' in the "
3772 "same options container is an error.\n",
3773 vm_options_file_args.vm_options_file_arg(),
3774 vm_options_file_args.container_name(),
3775 option->optionString);
3776 return JNI_EINVAL;
3777 }
3778 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3779 // If there's a VMOptionsFile, parse that
3780 jint code = insert_vm_options_file(args, tail, index,
3781 &vm_options_file_args, args_out);
3782 if (code != JNI_OK) {
3783 return code;
3784 }
3785 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3786 if (args_out->is_set()) {
3787 // The VMOptions file inserted some options so switch 'args'
3788 // to the new set of options, and continue processing which
3789 // preserves "last option wins" semantics.
3790 args = args_out->get();
3791 // The first option from the VMOptionsFile replaces the
3792 // current option. So we back track to process the
3793 // replacement option.
3794 index--;
3795 }
3796 continue;
3797 }
3798 if (match_option(option, "-XX:+PrintVMOptions")) {
3799 PrintVMOptions = true;
3800 continue;
3801 }
3802 if (match_option(option, "-XX:-PrintVMOptions")) {
3803 PrintVMOptions = false;
3804 continue;
3805 }
3806 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3807 IgnoreUnrecognizedVMOptions = true;
3808 continue;
3809 }
3810 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3811 IgnoreUnrecognizedVMOptions = false;
3812 continue;
3813 }
3814 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3815 JVMFlag::printFlags(tty, false);
3816 vm_exit(0);
3817 }
3818
3819 #ifndef PRODUCT
3820 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3821 JVMFlag::printFlags(tty, true);
3822 vm_exit(0);
3823 }
3824 #endif
3825 }
3826 return JNI_OK;
3827 }
3828
3829 static void print_options(const JavaVMInitArgs *args) {
3830 const char* tail;
3831 for (int index = 0; index < args->nOptions; index++) {
3832 const JavaVMOption *option = args->options + index;
3833 if (match_option(option, "-XX:", &tail)) {
3834 logOption(tail);
3835 }
3836 }
3837 }
3838
3839 bool Arguments::handle_deprecated_print_gc_flags() {
3840 if (PrintGC) {
3841 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3842 }
3843 if (PrintGCDetails) {
3844 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3845 }
3846
3847 if (_legacyGCLogging.lastFlag == 2) {
3848 // -Xloggc was used to specify a filename
3849 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3850
3851 LogTarget(Error, logging) target;
3852 LogStream errstream(target);
3853 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3854 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3855 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3856 }
3857 return true;
3858 }
3859
3860 static void apply_debugger_ergo() {
3861 if (ReplayCompiles) {
3862 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3863 }
3864
3865 if (UseDebuggerErgo) {
3866 // Turn on sub-flags
3867 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3868 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3869 }
3870
3871 if (UseDebuggerErgo2) {
3872 // Debugging with limited number of CPUs
3873 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3874 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3875 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3876 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3877 }
3878 }
3879
3880 // Parse entry point called from JNI_CreateJavaVM
3881
3882 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3883 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3884 JVMFlag::check_all_flag_declarations();
3885
3886 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3887 const char* hotspotrc = ".hotspotrc";
3888 bool settings_file_specified = false;
3889 bool needs_hotspotrc_warning = false;
3890 ScopedVMInitArgs initial_vm_options_args("");
3891 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3892 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3893
3894 // Pointers to current working set of containers
3895 JavaVMInitArgs* cur_cmd_args;
3896 JavaVMInitArgs* cur_vm_options_args;
3897 JavaVMInitArgs* cur_java_options_args;
3898 JavaVMInitArgs* cur_java_tool_options_args;
3899
3900 // Containers for modified/expanded options
3901 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3902 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3903 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3904 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3905
3906
3907 jint code =
3908 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3909 if (code != JNI_OK) {
3910 return code;
3911 }
3912
3913 code = parse_java_options_environment_variable(&initial_java_options_args);
3914 if (code != JNI_OK) {
3915 return code;
3916 }
3917
3918 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3919 char *vmoptions = ClassLoader::lookup_vm_options();
3920 if (vmoptions != NULL) {
3921 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3922 FREE_C_HEAP_ARRAY(char, vmoptions);
3923 if (code != JNI_OK) {
3924 return code;
3925 }
3926 }
3927
3928 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3929 &mod_java_tool_options_args,
3930 &cur_java_tool_options_args);
3931 if (code != JNI_OK) {
3932 return code;
3933 }
3934
3935 code = expand_vm_options_as_needed(initial_cmd_args,
3936 &mod_cmd_args,
3937 &cur_cmd_args);
3938 if (code != JNI_OK) {
3939 return code;
3940 }
3941
3942 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3943 &mod_java_options_args,
3944 &cur_java_options_args);
3945 if (code != JNI_OK) {
3946 return code;
3947 }
3948
3949 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3950 &mod_vm_options_args,
3951 &cur_vm_options_args);
3952 if (code != JNI_OK) {
3953 return code;
3954 }
3955
3956 const char* flags_file = Arguments::get_jvm_flags_file();
3957 settings_file_specified = (flags_file != NULL);
3958
3959 if (IgnoreUnrecognizedVMOptions) {
3960 cur_cmd_args->ignoreUnrecognized = true;
3961 cur_java_tool_options_args->ignoreUnrecognized = true;
3962 cur_java_options_args->ignoreUnrecognized = true;
3963 }
3964
3965 // Parse specified settings file
3966 if (settings_file_specified) {
3967 if (!process_settings_file(flags_file, true,
3968 cur_cmd_args->ignoreUnrecognized)) {
3969 return JNI_EINVAL;
3970 }
3971 } else {
3972 #ifdef ASSERT
3973 // Parse default .hotspotrc settings file
3974 if (!process_settings_file(".hotspotrc", false,
3975 cur_cmd_args->ignoreUnrecognized)) {
3976 return JNI_EINVAL;
3977 }
3978 #else
3979 struct stat buf;
3980 if (os::stat(hotspotrc, &buf) == 0) {
3981 needs_hotspotrc_warning = true;
3982 }
3983 #endif
3984 }
3985
3986 if (PrintVMOptions) {
3987 print_options(cur_java_tool_options_args);
3988 print_options(cur_cmd_args);
3989 print_options(cur_java_options_args);
3990 }
3991
3992 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3993 jint result = parse_vm_init_args(cur_vm_options_args,
3994 cur_java_tool_options_args,
3995 cur_java_options_args,
3996 cur_cmd_args);
3997
3998 if (result != JNI_OK) {
3999 return result;
4000 }
4001
4002 // Delay warning until here so that we've had a chance to process
4003 // the -XX:-PrintWarnings flag
4004 if (needs_hotspotrc_warning) {
4005 warning("%s file is present but has been ignored. "
4006 "Run with -XX:Flags=%s to load the file.",
4007 hotspotrc, hotspotrc);
4008 }
4009
4010 if (needs_module_property_warning) {
4011 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4012 " names that are reserved for internal use.");
4013 }
4014
4015 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4016 UNSUPPORTED_OPTION(UseLargePages);
4017 #endif
4018
4019 #if defined(AIX)
4020 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4021 #endif
4022
4023 #ifndef PRODUCT
4024 if (TraceBytecodesAt != 0) {
4025 TraceBytecodes = true;
4026 }
4027 if (CountCompiledCalls) {
4028 if (UseCounterDecay) {
4029 warning("UseCounterDecay disabled because CountCalls is set");
4030 UseCounterDecay = false;
4031 }
4032 }
4033 #endif // PRODUCT
4034
4035 if (ScavengeRootsInCode == 0) {
4036 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4037 warning("Forcing ScavengeRootsInCode non-zero");
4038 }
4039 ScavengeRootsInCode = 1;
4040 }
4041
4042 if (!handle_deprecated_print_gc_flags()) {
4043 return JNI_EINVAL;
4044 }
4045
4046 // Set object alignment values.
4047 set_object_alignment();
4048
4049 #if !INCLUDE_CDS
4050 if (DumpSharedSpaces || RequireSharedSpaces) {
4051 jio_fprintf(defaultStream::error_stream(),
4052 "Shared spaces are not supported in this VM\n");
4053 return JNI_ERR;
4054 }
4055 if (DumpLoadedClassList != NULL) {
4056 jio_fprintf(defaultStream::error_stream(),
4057 "DumpLoadedClassList is not supported in this VM\n");
4058 return JNI_ERR;
4059 }
4060 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
4061 log_is_enabled(Info, cds)) {
4062 warning("Shared spaces are not supported in this VM");
4063 UseSharedSpaces = false;
4064 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4065 }
4066 no_shared_spaces("CDS Disabled");
4067 #endif // INCLUDE_CDS
4068
4069 // Verify NMT arguments
4070 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
4071 if (lvl == NMT_unknown) {
4072 jio_fprintf(defaultStream::error_stream(),
4073 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4074 return JNI_ERR;
4075 }
4076 if (PrintNMTStatistics && lvl == NMT_off) {
4077 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
4078 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
4079 }
4080
4081 if (TraceDependencies && VerifyDependencies) {
4082 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
4083 warning("TraceDependencies results may be inflated by VerifyDependencies");
4084 }
4085 }
4086
4087 apply_debugger_ergo();
4088
4089 if (log_is_enabled(Info, arguments)) {
4090 LogStream st(Log(arguments)::info());
4091 Arguments::print_on(&st);
4092 }
4093
4094 return JNI_OK;
4095 }
4096
4097 jint Arguments::apply_ergo() {
4098 // Set flags based on ergonomics.
4099 jint result = set_ergonomics_flags();
4100 if (result != JNI_OK) return result;
4101
4102 // Set heap size based on available physical memory
4103 set_heap_size();
4104
4105 GCConfig::arguments()->initialize();
4106
4107 set_shared_spaces_flags_and_archive_paths();
4108
4109 // Initialize Metaspace flags and alignments
4110 Metaspace::ergo_initialize();
4111
4112 if (!StringDedup::ergo_initialize()) {
4113 return JNI_EINVAL;
4114 }
4115
4116 // Set compiler flags after GC is selected and GC specific
4117 // flags (LoopStripMiningIter) are set.
4118 CompilerConfig::ergo_initialize();
4119
4120 // Set bytecode rewriting flags
4121 set_bytecode_flags();
4122
4123 // Set flags if aggressive optimization flags are enabled
4124 jint code = set_aggressive_opts_flags();
4125 if (code != JNI_OK) {
4126 return code;
4127 }
4128
4129 #ifdef ZERO
4130 // Clear flags not supported on zero.
4131 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4132
4133 if (LogTouchedMethods) {
4134 warning("LogTouchedMethods is not supported for Zero");
4135 FLAG_SET_DEFAULT(LogTouchedMethods, false);
4136 }
4137 #endif // ZERO
4138
4139 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4140 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4141 DebugNonSafepoints = true;
4142 }
4143
4144 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4145 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4146 }
4147
4148 // Treat the odd case where local verification is enabled but remote
4149 // verification is not as if both were enabled.
4150 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4151 log_info(verification)("Turning on remote verification because local verification is on");
4152 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4153 }
4154
4155 #ifndef PRODUCT
4156 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4157 if (use_vm_log()) {
4158 LogVMOutput = true;
4159 }
4160 }
4161 #endif // PRODUCT
4162
4163 if (PrintCommandLineFlags) {
4164 JVMFlag::printSetFlags(tty);
4165 }
4166
4167 #ifdef COMPILER2
4168 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4169 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4170 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4171 }
4172 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4173
4174 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4175 if (!EnableVectorReboxing) {
4176 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4177 } else {
4178 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4179 }
4180 }
4181 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4182
4183 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4184 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4185 }
4186 FLAG_SET_DEFAULT(UseVectorStubs, false);
4187 }
4188 #endif // COMPILER2
4189
4190 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4191 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4192 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4193 }
4194 }
4195
4196 return JNI_OK;
4197 }
4198
4199 jint Arguments::adjust_after_os() {
4200 if (UseNUMA) {
4201 if (UseParallelGC) {
4202 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4203 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4204 }
4205 }
4206 }
4207 return JNI_OK;
4208 }
4209
4210 int Arguments::PropertyList_count(SystemProperty* pl) {
4211 int count = 0;
4212 while(pl != NULL) {
4213 count++;
4214 pl = pl->next();
4215 }
4216 return count;
4217 }
4218
4219 // Return the number of readable properties.
4220 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4221 int count = 0;
4222 while(pl != NULL) {
4223 if (pl->readable()) {
4224 count++;
4225 }
4226 pl = pl->next();
4227 }
4228 return count;
4229 }
4230
4231 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4232 assert(key != NULL, "just checking");
4233 SystemProperty* prop;
4234 for (prop = pl; prop != NULL; prop = prop->next()) {
4235 if (strcmp(key, prop->key()) == 0) return prop->value();
4236 }
4237 return NULL;
4238 }
4239
4240 // Return the value of the requested property provided that it is a readable property.
4241 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4242 assert(key != NULL, "just checking");
4243 SystemProperty* prop;
4244 // Return the property value if the keys match and the property is not internal or
4245 // it's the special internal property "jdk.boot.class.path.append".
4246 for (prop = pl; prop != NULL; prop = prop->next()) {
4247 if (strcmp(key, prop->key()) == 0) {
4248 if (!prop->internal()) {
4249 return prop->value();
4250 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4251 return prop->value();
4252 } else {
4253 // Property is internal and not jdk.boot.class.path.append so return NULL.
4254 return NULL;
4255 }
4256 }
4257 }
4258 return NULL;
4259 }
4260
4261 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4262 int count = 0;
4263 const char* ret_val = NULL;
4264
4265 while(pl != NULL) {
4266 if(count >= index) {
4267 ret_val = pl->key();
4268 break;
4269 }
4270 count++;
4271 pl = pl->next();
4272 }
4273
4274 return ret_val;
4275 }
4276
4277 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4278 int count = 0;
4279 char* ret_val = NULL;
4280
4281 while(pl != NULL) {
4282 if(count >= index) {
4283 ret_val = pl->value();
4284 break;
4285 }
4286 count++;
4287 pl = pl->next();
4288 }
4289
4290 return ret_val;
4291 }
4292
4293 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4294 SystemProperty* p = *plist;
4295 if (p == NULL) {
4296 *plist = new_p;
4297 } else {
4298 while (p->next() != NULL) {
4299 p = p->next();
4300 }
4301 p->set_next(new_p);
4302 }
4303 }
4304
4305 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4306 bool writeable, bool internal) {
4307 if (plist == NULL)
4308 return;
4309
4310 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4311 PropertyList_add(plist, new_p);
4312 }
4313
4314 void Arguments::PropertyList_add(SystemProperty *element) {
4315 PropertyList_add(&_system_properties, element);
4316 }
4317
4318 // This add maintains unique property key in the list.
4319 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4320 PropertyAppendable append, PropertyWriteable writeable,
4321 PropertyInternal internal) {
4322 if (plist == NULL)
4323 return;
4324
4325 // If property key exists and is writeable, then update with new value.
4326 // Trying to update a non-writeable property is silently ignored.
4327 SystemProperty* prop;
4328 for (prop = *plist; prop != NULL; prop = prop->next()) {
4329 if (strcmp(k, prop->key()) == 0) {
4330 if (append == AppendProperty) {
4331 prop->append_writeable_value(v);
4332 } else {
4333 prop->set_writeable_value(v);
4334 }
4335 return;
4336 }
4337 }
4338
4339 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4340 }
4341
4342 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4343 // Returns true if all of the source pointed by src has been copied over to
4344 // the destination buffer pointed by buf. Otherwise, returns false.
4345 // Notes:
4346 // 1. If the length (buflen) of the destination buffer excluding the
4347 // NULL terminator character is not long enough for holding the expanded
4348 // pid characters, it also returns false instead of returning the partially
4349 // expanded one.
4350 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4351 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4352 char* buf, size_t buflen) {
4353 const char* p = src;
4354 char* b = buf;
4355 const char* src_end = &src[srclen];
4356 char* buf_end = &buf[buflen - 1];
4357
4358 while (p < src_end && b < buf_end) {
4359 if (*p == '%') {
4360 switch (*(++p)) {
4361 case '%': // "%%" ==> "%"
4362 *b++ = *p++;
4363 break;
4364 case 'p': { // "%p" ==> current process id
4365 // buf_end points to the character before the last character so
4366 // that we could write '\0' to the end of the buffer.
4367 size_t buf_sz = buf_end - b + 1;
4368 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4369
4370 // if jio_snprintf fails or the buffer is not long enough to hold
4371 // the expanded pid, returns false.
4372 if (ret < 0 || ret >= (int)buf_sz) {
4373 return false;
4374 } else {
4375 b += ret;
4376 assert(*b == '\0', "fail in copy_expand_pid");
4377 if (p == src_end && b == buf_end + 1) {
4378 // reach the end of the buffer.
4379 return true;
4380 }
4381 }
4382 p++;
4383 break;
4384 }
4385 default :
4386 *b++ = '%';
4387 }
4388 } else {
4389 *b++ = *p++;
4390 }
4391 }
4392 *b = '\0';
4393 return (p == src_end); // return false if not all of the source was copied
4394 }