1 /*
2 * Copyright (c) 1997, 2023, 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 "cds/cds_globals.hpp"
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 "jvm.h"
39 #include "logging/log.hpp"
40 #include "logging/logConfiguration.hpp"
41 #include "logging/logStream.hpp"
42 #include "logging/logTag.hpp"
43 #include "memory/allocation.inline.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/synchronizer.hpp"
57 #include "runtime/vm_version.hpp"
58 #include "services/management.hpp"
59 #include "services/nmtCommon.hpp"
60 #include "utilities/align.hpp"
61 #include "utilities/debug.hpp"
62 #include "utilities/defaultStream.hpp"
63 #include "utilities/macros.hpp"
64 #include "utilities/parseInteger.hpp"
65 #include "utilities/powerOfTwo.hpp"
66 #include "utilities/stringUtils.hpp"
67 #if INCLUDE_JFR
68 #include "jfr/jfr.hpp"
69 #endif
70
71 #include <limits>
72 #include <string.h>
73
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 size_t Arguments::_conservative_max_heap_alignment = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = NULL;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
97
98 bool Arguments::_enable_preview = false;
99
100 char* Arguments::SharedArchivePath = NULL;
101 char* Arguments::SharedDynamicArchivePath = NULL;
102
103 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
104
105 AgentLibraryList Arguments::_libraryList;
106 AgentLibraryList Arguments::_agentList;
107
108 // These are not set by the JDK's built-in launchers, but they can be set by
109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
110 // JavaVMOption in jni.h.
111 abort_hook_t Arguments::_abort_hook = NULL;
112 exit_hook_t Arguments::_exit_hook = NULL;
113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = NULL;
117 SystemProperty *Arguments::_java_library_path = NULL;
118 SystemProperty *Arguments::_java_home = NULL;
119 SystemProperty *Arguments::_java_class_path = NULL;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
121 SystemProperty *Arguments::_vm_info = NULL;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
124 PathString *Arguments::_boot_class_path = NULL;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = NULL;
128
129 // True if -Xshare:auto option was specified.
130 static bool xshare_auto_cmd_line = false;
131
132 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
133 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
134 if (new_value == NULL) {
135 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
136 return false;
137 }
138 if (_value != NULL) {
139 FreeHeap(_value);
140 }
141 _value = new_value;
142 strcpy(_value, value);
143 return true;
144 }
145
146 void PathString::append_value(const char *value) {
147 char *sp;
148 size_t len = 0;
149 if (value != NULL) {
150 len = strlen(value);
151 if (_value != NULL) {
152 len += strlen(_value);
153 }
154 sp = AllocateHeap(len+2, mtArguments);
155 assert(sp != NULL, "Unable to allocate space for new append path value");
156 if (sp != NULL) {
157 if (_value != NULL) {
158 strcpy(sp, _value);
159 strcat(sp, os::path_separator());
160 strcat(sp, value);
161 FreeHeap(_value);
162 } else {
163 strcpy(sp, value);
164 }
165 _value = sp;
166 }
167 }
168 }
169
170 PathString::PathString(const char* value) {
171 if (value == NULL) {
172 _value = NULL;
173 } else {
174 _value = AllocateHeap(strlen(value)+1, mtArguments);
175 strcpy(_value, value);
176 }
177 }
178
179 PathString::~PathString() {
180 if (_value != NULL) {
181 FreeHeap(_value);
182 _value = NULL;
183 }
184 }
185
186 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
187 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
188 size_t len = strlen(module_name) + 1;
189 _module_name = AllocateHeap(len, mtInternal);
190 strncpy(_module_name, module_name, len); // copy the trailing null
191 _path = new PathString(path);
192 }
193
194 ModulePatchPath::~ModulePatchPath() {
195 if (_module_name != NULL) {
196 FreeHeap(_module_name);
197 _module_name = NULL;
198 }
199 if (_path != NULL) {
200 delete _path;
201 _path = NULL;
202 }
203 }
204
205 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
206 if (key == NULL) {
207 _key = NULL;
208 } else {
209 _key = AllocateHeap(strlen(key)+1, mtArguments);
210 strcpy(_key, key);
211 }
212 _next = NULL;
213 _internal = internal;
214 _writeable = writeable;
215 }
216
217 AgentLibrary::AgentLibrary(const char* name, const char* options,
218 bool is_absolute_path, void* os_lib,
219 bool instrument_lib) {
220 _name = AllocateHeap(strlen(name)+1, mtArguments);
221 strcpy(_name, name);
222 if (options == NULL) {
223 _options = NULL;
224 } else {
225 _options = AllocateHeap(strlen(options)+1, mtArguments);
226 strcpy(_options, options);
227 }
228 _is_absolute_path = is_absolute_path;
229 _os_lib = os_lib;
230 _next = NULL;
231 _state = agent_invalid;
232 _is_static_lib = false;
233 _is_instrument_lib = instrument_lib;
234 }
235
236 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
237 // part of the option string.
238 static bool match_option(const JavaVMOption *option, const char* name,
239 const char** tail) {
240 size_t len = strlen(name);
241 if (strncmp(option->optionString, name, len) == 0) {
242 *tail = option->optionString + len;
243 return true;
244 } else {
245 return false;
246 }
247 }
248
249 // Check if 'option' matches 'name'. No "tail" is allowed.
250 static bool match_option(const JavaVMOption *option, const char* name) {
251 const char* tail = NULL;
252 bool result = match_option(option, name, &tail);
253 if (tail != NULL && *tail == '\0') {
254 return result;
255 } else {
256 return false;
257 }
258 }
259
260 // Return true if any of the strings in null-terminated array 'names' matches.
261 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
262 // the option must match exactly.
263 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
264 bool tail_allowed) {
265 for (/* empty */; *names != NULL; ++names) {
266 if (match_option(option, *names, tail)) {
267 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
268 return true;
269 }
270 }
271 }
272 return false;
273 }
274
275 #if INCLUDE_JFR
276 static bool _has_jfr_option = false; // is using JFR
277
278 // return true on failure
279 static bool match_jfr_option(const JavaVMOption** option) {
280 assert((*option)->optionString != NULL, "invariant");
281 char* tail = NULL;
282 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
283 _has_jfr_option = true;
284 return Jfr::on_start_flight_recording_option(option, tail);
285 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
286 _has_jfr_option = true;
287 return Jfr::on_flight_recorder_option(option, tail);
288 }
289 return false;
290 }
291
292 bool Arguments::has_jfr_option() {
293 return _has_jfr_option;
294 }
295 #endif
296
297 static void logOption(const char* opt) {
298 if (PrintVMOptions) {
299 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
300 }
301 }
302
303 bool needs_module_property_warning = false;
304
305 #define MODULE_PROPERTY_PREFIX "jdk.module."
306 #define MODULE_PROPERTY_PREFIX_LEN 11
307 #define ADDEXPORTS "addexports"
308 #define ADDEXPORTS_LEN 10
309 #define ADDREADS "addreads"
310 #define ADDREADS_LEN 8
311 #define ADDOPENS "addopens"
312 #define ADDOPENS_LEN 8
313 #define PATCH "patch"
314 #define PATCH_LEN 5
315 #define ADDMODS "addmods"
316 #define ADDMODS_LEN 7
317 #define LIMITMODS "limitmods"
318 #define LIMITMODS_LEN 9
319 #define PATH "path"
320 #define PATH_LEN 4
321 #define UPGRADE_PATH "upgrade.path"
322 #define UPGRADE_PATH_LEN 12
323 #define ENABLE_NATIVE_ACCESS "enable.native.access"
324 #define ENABLE_NATIVE_ACCESS_LEN 20
325
326 void Arguments::add_init_library(const char* name, char* options) {
327 _libraryList.add(new AgentLibrary(name, options, false, NULL));
328 }
329
330 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
331 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
332 }
333
334 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
335 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
336 }
337
338 // Late-binding agents not started via arguments
339 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
340 _agentList.add(agentLib);
341 }
342
343 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
344 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
345 return ((strncmp(option, property, len) == 0) &&
346 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
347 }
348
349 // Return true if property starts with "jdk.module." and its ensuing chars match
350 // any of the reserved module properties.
351 // property should be passed without the leading "-D".
352 bool Arguments::is_internal_module_property(const char* property) {
353 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
354 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
355 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
356 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
357 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
358 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
359 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
360 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
361 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
362 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
363 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
364 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
365 return true;
366 }
367 }
368 return false;
369 }
370
371 // Process java launcher properties.
372 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
373 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
374 // Must do this before setting up other system properties,
375 // as some of them may depend on launcher type.
376 for (int index = 0; index < args->nOptions; index++) {
377 const JavaVMOption* option = args->options + index;
378 const char* tail;
379
380 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
381 process_java_launcher_argument(tail, option->extraInfo);
382 continue;
383 }
384 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
385 if (strcmp(tail, "true") == 0) {
386 _sun_java_launcher_is_altjvm = true;
387 }
388 continue;
389 }
390 }
391 }
392
393 // Initialize system properties key and value.
394 void Arguments::init_system_properties() {
395
396 // Set up _boot_class_path which is not a property but
397 // relies heavily on argument processing and the jdk.boot.class.path.append
398 // property. It is used to store the underlying boot class path.
399 _boot_class_path = new PathString(NULL);
400
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
402 "Java Virtual Machine Specification", false));
403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
404 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
405 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
406
407 // Initialize the vm.info now, but it will need updating after argument parsing.
408 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
409
410 // Following are JVMTI agent writable properties.
411 // Properties values are set to NULL and they are
412 // os specific they are initialized in os::init_system_properties_values().
413 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
414 _java_library_path = new SystemProperty("java.library.path", NULL, true);
415 _java_home = new SystemProperty("java.home", NULL, true);
416 _java_class_path = new SystemProperty("java.class.path", "", true);
417 // jdk.boot.class.path.append is a non-writeable, internal property.
418 // It can only be set by either:
419 // - -Xbootclasspath/a:
420 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
421 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true);
422
423 // Add to System Property list.
424 PropertyList_add(&_system_properties, _sun_boot_library_path);
425 PropertyList_add(&_system_properties, _java_library_path);
426 PropertyList_add(&_system_properties, _java_home);
427 PropertyList_add(&_system_properties, _java_class_path);
428 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
429 PropertyList_add(&_system_properties, _vm_info);
430
431 // Set OS specific system properties values
432 os::init_system_properties_values();
433 }
434
435 // Update/Initialize System properties after JDK version number is known
436 void Arguments::init_version_specific_system_properties() {
437 enum { bufsz = 16 };
438 char buffer[bufsz];
439 const char* spec_vendor = "Oracle Corporation";
440 uint32_t spec_version = JDK_Version::current().major_version();
441
442 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
443
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
446 PropertyList_add(&_system_properties,
447 new SystemProperty("java.vm.specification.version", buffer, false));
448 PropertyList_add(&_system_properties,
449 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
450 }
451
452 /*
453 * -XX argument processing:
454 *
455 * -XX arguments are defined in several places, such as:
456 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
457 * -XX arguments are parsed in parse_argument().
458 * -XX argument bounds checking is done in check_vm_args_consistency().
459 *
460 * Over time -XX arguments may change. There are mechanisms to handle common cases:
461 *
462 * ALIASED: An option that is simply another name for another option. This is often
463 * part of the process of deprecating a flag, but not all aliases need
464 * to be deprecated.
465 *
466 * Create an alias for an option by adding the old and new option names to the
467 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
468 *
469 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
470 * support may be removed in the future. Both regular and aliased options may be
471 * deprecated.
472 *
473 * Add a deprecation warning for an option (or alias) by adding an entry in the
474 * "special_jvm_flags" table and setting the "deprecated_in" field.
475 * Often an option "deprecated" in one major release will
476 * be made "obsolete" in the next. In this case the entry should also have its
477 * "obsolete_in" field set.
478 *
479 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
480 * on the command line. A warning is printed to let the user know that option might not
481 * be accepted in the future.
482 *
483 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
484 * table and setting the "obsolete_in" field.
485 *
486 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
487 * to the current JDK version. The system will flatly refuse to admit the existence of
488 * the flag. This allows a flag to die automatically over JDK releases.
489 *
490 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
491 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
492 * - Newly obsolete or expired deprecated options should have their global variable
493 * definitions removed (from globals.hpp, etc) and related implementations removed.
494 *
495 * Recommended approach for removing options:
496 *
497 * To remove options commonly used by customers (e.g. product -XX options), use
498 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
499 *
500 * To remove internal options (e.g. diagnostic, experimental, develop options), use
501 * a 2-step model adding major release numbers to the obsolete and expire columns.
502 *
503 * To change the name of an option, use the alias table as well as a 2-step
504 * model adding major release numbers to the deprecate and expire columns.
505 * Think twice about aliasing commonly used customer options.
506 *
507 * There are times when it is appropriate to leave a future release number as undefined.
508 *
509 * Tests: Aliases should be tested in VMAliasOptions.java.
510 * Deprecated options should be tested in VMDeprecatedOptions.java.
511 */
512
513 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
514 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
515 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
516 // the command-line as usual, but will issue a warning.
517 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
518 // the command-line, while issuing a warning and ignoring the flag value.
519 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
520 // existence of the flag.
521 //
522 // MANUAL CLEANUP ON JDK VERSION UPDATES:
523 // This table ensures that the handling of options will update automatically when the JDK
524 // version is incremented, but the source code needs to be cleanup up manually:
525 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
526 // variable should be removed, as well as users of the variable.
527 // - As "deprecated" options age into "obsolete" options, move the entry into the
528 // "Obsolete Flags" section of the table.
529 // - All expired options should be removed from the table.
530 static SpecialFlag const special_jvm_flags[] = {
531 // -------------- Deprecated Flags --------------
532 // --- Non-alias flags - sorted by obsolete_in then expired_in:
533 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
537 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
540 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
541 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
542 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
543 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) },
544
545 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
546 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
547 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
548 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
549
550 // -------------- Obsolete Flags - sorted by expired_in --------------
551
552 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
553 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
554 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
555 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
556 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
557 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
558
559 #ifdef ASSERT
560 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
561 #endif
562
563 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
564 // These entries will generate build errors. Their purpose is to test the macros.
565 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
566 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
567 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
568 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
569 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
570 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
572 #endif
573
574 { NULL, JDK_Version(0), JDK_Version(0) }
575 };
576
577 // Flags that are aliases for other flags.
578 typedef struct {
579 const char* alias_name;
580 const char* real_name;
581 } AliasedFlag;
582
583 static AliasedFlag const aliased_jvm_flags[] = {
584 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
585 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
586 { NULL, NULL}
587 };
588
589 // Return true if "v" is less than "other", where "other" may be "undefined".
590 static bool version_less_than(JDK_Version v, JDK_Version other) {
591 assert(!v.is_undefined(), "must be defined");
592 if (!other.is_undefined() && v.compare(other) >= 0) {
593 return false;
594 } else {
595 return true;
596 }
597 }
598
599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
600 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
601 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
602 flag = special_jvm_flags[i];
603 return true;
604 }
605 }
606 return false;
607 }
608
609 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
610 assert(version != NULL, "Must provide a version buffer");
611 SpecialFlag flag;
612 if (lookup_special_flag(flag_name, flag)) {
613 if (!flag.obsolete_in.is_undefined()) {
614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
615 *version = flag.obsolete_in;
616 // This flag may have been marked for obsoletion in this version, but we may not
617 // have actually removed it yet. Rather than ignoring it as soon as we reach
618 // this version we allow some time for the removal to happen. So if the flag
619 // still actually exists we process it as normal, but issue an adjusted warning.
620 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
621 if (real_flag != NULL) {
622 char version_str[256];
623 version->to_string(version_str, sizeof(version_str));
624 warning("Temporarily processing option %s; support is scheduled for removal in %s",
625 flag_name, version_str);
626 return false;
627 }
628 return true;
629 }
630 }
631 }
632 return false;
633 }
634
635 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != NULL, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.deprecated_in.is_undefined()) {
640 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
641 version_less_than(JDK_Version::current(), flag.expired_in)) {
642 *version = flag.deprecated_in;
643 return 1;
644 } else {
645 return -1;
646 }
647 }
648 }
649 return 0;
650 }
651
652 const char* Arguments::real_flag_name(const char *flag_name) {
653 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
654 const AliasedFlag& flag_status = aliased_jvm_flags[i];
655 if (strcmp(flag_status.alias_name, flag_name) == 0) {
656 return flag_status.real_name;
657 }
658 }
659 return flag_name;
660 }
661
662 #ifdef ASSERT
663 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
664 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
665 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
666 return true;
667 }
668 }
669 return false;
670 }
671
672 // Verifies the correctness of the entries in the special_jvm_flags table.
673 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
674 // version being earlier than the deprecation version, then a warning is issued
675 // and verification fails - by returning false. If it is detected that the table
676 // is out of date, with respect to the current version, then ideally a warning is
677 // issued but verification does not fail. This allows the VM to operate when the
678 // version is first updated, without needing to update all the impacted flags at
679 // the same time. In practice we can't issue the warning immediately when the version
680 // is updated as it occurs for every test and some tests are not prepared to handle
681 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
682 // if the check_globals flag is true, and in addition allow a grace period and only
683 // check for stale flags when we hit build 25 (which is far enough into the 6 month
684 // release cycle that all flag updates should have been processed, whilst still
685 // leaving time to make the change before RDP2).
686 // We use a gtest to call this, passing true, so that we can detect stale flags before
687 // the end of the release cycle.
688
689 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
690
691 bool Arguments::verify_special_jvm_flags(bool check_globals) {
692 bool success = true;
693 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
694 const SpecialFlag& flag = special_jvm_flags[i];
695 if (lookup_special_flag(flag.name, i)) {
696 warning("Duplicate special flag declaration \"%s\"", flag.name);
697 success = false;
698 }
699 if (flag.deprecated_in.is_undefined() &&
700 flag.obsolete_in.is_undefined()) {
701 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
702 success = false;
703 }
704
705 if (!flag.deprecated_in.is_undefined()) {
706 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
707 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
708 success = false;
709 }
710
711 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
712 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
713 success = false;
714 }
715 }
716
717 if (!flag.obsolete_in.is_undefined()) {
718 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
720 success = false;
721 }
722
723 // if flag has become obsolete it should not have a "globals" flag defined anymore.
724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
725 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
726 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
727 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
728 success = false;
729 }
730 }
731
732 } else if (!flag.expired_in.is_undefined()) {
733 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 if (!flag.expired_in.is_undefined()) {
738 // if flag has become expired it should not have a "globals" flag defined anymore.
739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
740 !version_less_than(JDK_Version::current(), flag.expired_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
742 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
743 success = false;
744 }
745 }
746 }
747 }
748 return success;
749 }
750 #endif
751
752 bool Arguments::atojulong(const char *s, julong* result) {
753 return parse_integer(s, result);
754 }
755
756 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
757 if (size < min_size) return arg_too_small;
758 if (size > max_size) return arg_too_big;
759 return arg_in_range;
760 }
761
762 // Describe an argument out of range error
763 void Arguments::describe_range_error(ArgsRange errcode) {
764 switch(errcode) {
765 case arg_too_big:
766 jio_fprintf(defaultStream::error_stream(),
767 "The specified size exceeds the maximum "
768 "representable size.\n");
769 break;
770 case arg_too_small:
771 case arg_unreadable:
772 case arg_in_range:
773 // do nothing for now
774 break;
775 default:
776 ShouldNotReachHere();
777 }
778 }
779
780 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
781 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
782 return true;
783 } else {
784 return false;
785 }
786 }
787
788 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 // strtod allows leading whitespace, but our flag format does not.
790 if (*value == '\0' || isspace(*value)) {
791 return false;
792 }
793 char* end;
794 errno = 0;
795 double v = strtod(value, &end);
796 if ((errno != 0) || (*end != 0)) {
797 return false;
798 }
799 if (g_isnan(v) || !g_isfinite(v)) {
800 // Currently we cannot handle these special values.
801 return false;
802 }
803
804 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
805 return true;
806 }
807 return false;
808 }
809
810 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
811 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
812
813 if (flag->is_int()) {
814 int v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_int(flag, &v, origin);
817 }
818 } else if (flag->is_uint()) {
819 uint v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_uint(flag, &v, origin);
822 }
823 } else if (flag->is_intx()) {
824 intx v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_intx(flag, &v, origin);
827 }
828 } else if (flag->is_uintx()) {
829 uintx v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uintx(flag, &v, origin);
832 }
833 } else if (flag->is_uint64_t()) {
834 uint64_t v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
837 }
838 } else if (flag->is_size_t()) {
839 size_t v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_size_t(flag, &v, origin);
842 }
843 }
844
845 return result == JVMFlag::SUCCESS;
846 }
847
848 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
849 if (value[0] == '\0') {
850 value = NULL;
851 }
852 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
853 // Contract: JVMFlag always returns a pointer that needs freeing.
854 FREE_C_HEAP_ARRAY(char, value);
855 return true;
856 }
857
858 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
859 const char* old_value = "";
860 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
861 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
862 size_t new_len = strlen(new_value);
863 const char* value;
864 char* free_this_too = NULL;
865 if (old_len == 0) {
866 value = new_value;
867 } else if (new_len == 0) {
868 value = old_value;
869 } else {
870 size_t length = old_len + 1 + new_len + 1;
871 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
872 // each new setting adds another LINE to the switch:
873 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
874 value = buf;
875 free_this_too = buf;
876 }
877 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
878 // JVMFlag always returns a pointer that needs freeing.
879 FREE_C_HEAP_ARRAY(char, value);
880 // JVMFlag made its own copy, so I must delete my own temp. buffer.
881 FREE_C_HEAP_ARRAY(char, free_this_too);
882 return true;
883 }
884
885 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
886 const char* real_name = real_flag_name(arg);
887 JDK_Version since = JDK_Version();
888 switch (is_deprecated_flag(arg, &since)) {
889 case -1: {
890 // Obsolete or expired, so don't process normally,
891 // but allow for an obsolete flag we're still
892 // temporarily allowing.
893 if (!is_obsolete_flag(arg, &since)) {
894 return real_name;
895 }
896 // Note if we're not considered obsolete then we can't be expired either
897 // as obsoletion must come first.
898 return NULL;
899 }
900 case 0:
901 return real_name;
902 case 1: {
903 char version[256];
904 since.to_string(version, sizeof(version));
905 if (real_name != arg) {
906 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
907 arg, version, real_name);
908 } else {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
910 arg, version);
911 }
912 return real_name;
913 }
914 }
915 ShouldNotReachHere();
916 return NULL;
917 }
918
919 #define BUFLEN 255
920
921 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
922 char name_copied[BUFLEN+1];
923 if (name[name_length] != 0) {
924 if (name_length > BUFLEN) {
925 return NULL;
926 } else {
927 strncpy(name_copied, name, name_length);
928 name_copied[name_length] = '\0';
929 name = name_copied;
930 }
931 }
932
933 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
934 if (real_name == NULL) {
935 return NULL;
936 }
937 JVMFlag* flag = JVMFlag::find_flag(real_name);
938 return flag;
939 }
940
941 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
942 bool is_bool = false;
943 bool bool_val = false;
944 char c = *arg;
945 if (c == '+' || c == '-') {
946 is_bool = true;
947 bool_val = (c == '+');
948 arg++;
949 }
950
951 const char* name = arg;
952 while (true) {
953 c = *arg;
954 if (isalnum(c) || (c == '_')) {
955 ++arg;
956 } else {
957 break;
958 }
959 }
960
961 size_t name_len = size_t(arg - name);
962 if (name_len == 0) {
963 return false;
964 }
965
966 JVMFlag* flag = find_jvm_flag(name, name_len);
967 if (flag == NULL) {
968 return false;
969 }
970
971 if (is_bool) {
972 if (*arg != 0) {
973 // Error -- extra characters such as -XX:+BoolFlag=123
974 return false;
975 }
976 return set_bool_flag(flag, bool_val, origin);
977 }
978
979 if (arg[0] == '=') {
980 const char* value = arg + 1;
981 if (flag->is_ccstr()) {
982 if (flag->ccstr_accumulates()) {
983 return append_to_string_flag(flag, value, origin);
984 } else {
985 return set_string_flag(flag, value, origin);
986 }
987 } else if (flag->is_double()) {
988 return set_fp_numeric_flag(flag, value, origin);
989 } else {
990 return set_numeric_flag(flag, value, origin);
991 }
992 }
993
994 if (arg[0] == ':' && arg[1] == '=') {
995 // -XX:Foo:=xxx will reset the string flag to the given value.
996 const char* value = arg + 2;
997 return set_string_flag(flag, value, origin);
998 }
999
1000 return false;
1001 }
1002
1003 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1004 assert(bldarray != NULL, "illegal argument");
1005
1006 if (arg == NULL) {
1007 return;
1008 }
1009
1010 int new_count = *count + 1;
1011
1012 // expand the array and add arg to the last element
1013 if (*bldarray == NULL) {
1014 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1015 } else {
1016 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1017 }
1018 (*bldarray)[*count] = os::strdup_check_oom(arg);
1019 *count = new_count;
1020 }
1021
1022 void Arguments::build_jvm_args(const char* arg) {
1023 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1024 }
1025
1026 void Arguments::build_jvm_flags(const char* arg) {
1027 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1028 }
1029
1030 // utility function to return a string that concatenates all
1031 // strings in a given char** array
1032 const char* Arguments::build_resource_string(char** args, int count) {
1033 if (args == NULL || count == 0) {
1034 return NULL;
1035 }
1036 size_t length = 0;
1037 for (int i = 0; i < count; i++) {
1038 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1039 }
1040 char* s = NEW_RESOURCE_ARRAY(char, length);
1041 char* dst = s;
1042 for (int j = 0; j < count; j++) {
1043 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1044 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1045 dst += offset;
1046 length -= offset;
1047 }
1048 return (const char*) s;
1049 }
1050
1051 void Arguments::print_on(outputStream* st) {
1052 st->print_cr("VM Arguments:");
1053 if (num_jvm_flags() > 0) {
1054 st->print("jvm_flags: "); print_jvm_flags_on(st);
1055 st->cr();
1056 }
1057 if (num_jvm_args() > 0) {
1058 st->print("jvm_args: "); print_jvm_args_on(st);
1059 st->cr();
1060 }
1061 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1062 if (_java_class_path != NULL) {
1063 char* path = _java_class_path->value();
1064 size_t len = strlen(path);
1065 st->print("java_class_path (initial): ");
1066 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1067 if (len == 0) {
1068 st->print_raw_cr("<not set>");
1069 } else {
1070 st->print_raw_cr(path, len);
1071 }
1072 }
1073 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1074 }
1075
1076 void Arguments::print_summary_on(outputStream* st) {
1077 // Print the command line. Environment variables that are helpful for
1078 // reproducing the problem are written later in the hs_err file.
1079 // flags are from setting file
1080 if (num_jvm_flags() > 0) {
1081 st->print_raw("Settings File: ");
1082 print_jvm_flags_on(st);
1083 st->cr();
1084 }
1085 // args are the command line and environment variable arguments.
1086 st->print_raw("Command Line: ");
1087 if (num_jvm_args() > 0) {
1088 print_jvm_args_on(st);
1089 }
1090 // this is the classfile and any arguments to the java program
1091 if (java_command() != NULL) {
1092 st->print("%s", java_command());
1093 }
1094 st->cr();
1095 }
1096
1097 void Arguments::print_jvm_flags_on(outputStream* st) {
1098 if (_num_jvm_flags > 0) {
1099 for (int i=0; i < _num_jvm_flags; i++) {
1100 st->print("%s ", _jvm_flags_array[i]);
1101 }
1102 }
1103 }
1104
1105 void Arguments::print_jvm_args_on(outputStream* st) {
1106 if (_num_jvm_args > 0) {
1107 for (int i=0; i < _num_jvm_args; i++) {
1108 st->print("%s ", _jvm_args_array[i]);
1109 }
1110 }
1111 }
1112
1113 bool Arguments::process_argument(const char* arg,
1114 jboolean ignore_unrecognized,
1115 JVMFlagOrigin origin) {
1116 JDK_Version since = JDK_Version();
1117
1118 if (parse_argument(arg, origin)) {
1119 return true;
1120 }
1121
1122 // Determine if the flag has '+', '-', or '=' characters.
1123 bool has_plus_minus = (*arg == '+' || *arg == '-');
1124 const char* const argname = has_plus_minus ? arg + 1 : arg;
1125
1126 size_t arg_len;
1127 const char* equal_sign = strchr(argname, '=');
1128 if (equal_sign == NULL) {
1129 arg_len = strlen(argname);
1130 } else {
1131 arg_len = equal_sign - argname;
1132 }
1133
1134 // Only make the obsolete check for valid arguments.
1135 if (arg_len <= BUFLEN) {
1136 // Construct a string which consists only of the argument name without '+', '-', or '='.
1137 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1138 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1139 if (is_obsolete_flag(stripped_argname, &since)) {
1140 char version[256];
1141 since.to_string(version, sizeof(version));
1142 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1143 return true;
1144 }
1145 }
1146
1147 // For locked flags, report a custom error message if available.
1148 // Otherwise, report the standard unrecognized VM option.
1149 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1150 if (found_flag != NULL) {
1151 char locked_message_buf[BUFLEN];
1152 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1153 if (strlen(locked_message_buf) == 0) {
1154 if (found_flag->is_bool() && !has_plus_minus) {
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Missing +/- setting for VM option '%s'\n", argname);
1157 } else if (!found_flag->is_bool() && has_plus_minus) {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Unexpected +/- setting in VM option '%s'\n", argname);
1160 } else {
1161 jio_fprintf(defaultStream::error_stream(),
1162 "Improperly specified VM option '%s'\n", argname);
1163 }
1164 } else {
1165 #ifdef PRODUCT
1166 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1167 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1168 if (ignore_unrecognized && mismatched) {
1169 return true;
1170 }
1171 #endif
1172 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1173 }
1174 } else {
1175 if (ignore_unrecognized) {
1176 return true;
1177 }
1178 jio_fprintf(defaultStream::error_stream(),
1179 "Unrecognized VM option '%s'\n", argname);
1180 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1181 if (fuzzy_matched != NULL) {
1182 jio_fprintf(defaultStream::error_stream(),
1183 "Did you mean '%s%s%s'? ",
1184 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1185 fuzzy_matched->name(),
1186 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1187 }
1188 }
1189
1190 // allow for commandline "commenting out" options like -XX:#+Verbose
1191 return arg[0] == '#';
1192 }
1193
1194 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1195 FILE* stream = os::fopen(file_name, "rb");
1196 if (stream == NULL) {
1197 if (should_exist) {
1198 jio_fprintf(defaultStream::error_stream(),
1199 "Could not open settings file %s\n", file_name);
1200 return false;
1201 } else {
1202 return true;
1203 }
1204 }
1205
1206 char token[1024];
1207 int pos = 0;
1208
1209 bool in_white_space = true;
1210 bool in_comment = false;
1211 bool in_quote = false;
1212 char quote_c = 0;
1213 bool result = true;
1214
1215 int c = getc(stream);
1216 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1217 if (in_white_space) {
1218 if (in_comment) {
1219 if (c == '\n') in_comment = false;
1220 } else {
1221 if (c == '#') in_comment = true;
1222 else if (!isspace(c)) {
1223 in_white_space = false;
1224 token[pos++] = c;
1225 }
1226 }
1227 } else {
1228 if (c == '\n' || (!in_quote && isspace(c))) {
1229 // token ends at newline, or at unquoted whitespace
1230 // this allows a way to include spaces in string-valued options
1231 token[pos] = '\0';
1232 logOption(token);
1233 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1234 build_jvm_flags(token);
1235 pos = 0;
1236 in_white_space = true;
1237 in_quote = false;
1238 } else if (!in_quote && (c == '\'' || c == '"')) {
1239 in_quote = true;
1240 quote_c = c;
1241 } else if (in_quote && (c == quote_c)) {
1242 in_quote = false;
1243 } else {
1244 token[pos++] = c;
1245 }
1246 }
1247 c = getc(stream);
1248 }
1249 if (pos > 0) {
1250 token[pos] = '\0';
1251 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1252 build_jvm_flags(token);
1253 }
1254 fclose(stream);
1255 return result;
1256 }
1257
1258 //=============================================================================================================
1259 // Parsing of properties (-D)
1260
1261 const char* Arguments::get_property(const char* key) {
1262 return PropertyList_get_value(system_properties(), key);
1263 }
1264
1265 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1266 const char* eq = strchr(prop, '=');
1267 const char* key;
1268 const char* value = "";
1269
1270 if (eq == NULL) {
1271 // property doesn't have a value, thus use passed string
1272 key = prop;
1273 } else {
1274 // property have a value, thus extract it and save to the
1275 // allocated string
1276 size_t key_len = eq - prop;
1277 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1278
1279 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1280 key = tmp_key;
1281
1282 value = &prop[key_len + 1];
1283 }
1284
1285 #if INCLUDE_CDS
1286 if (is_internal_module_property(key) ||
1287 strcmp(key, "jdk.module.main") == 0) {
1288 MetaspaceShared::disable_optimized_module_handling();
1289 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1290 }
1291 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1292 strcmp(key, "jdk.module.validation") == 0 ||
1293 strcmp(key, "java.system.class.loader") == 0) {
1294 MetaspaceShared::disable_full_module_graph();
1295 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1296 }
1297 #endif
1298
1299 if (strcmp(key, "java.compiler") == 0) {
1300 process_java_compiler_argument(value);
1301 // Record value in Arguments, but let it get passed to Java.
1302 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1303 // sun.java.launcher.is_altjvm property is
1304 // private and is processed in process_sun_java_launcher_properties();
1305 // the sun.java.launcher property is passed on to the java application
1306 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1307 // append is true, writable is true, internal is false
1308 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1309 WriteableProperty, ExternalProperty);
1310 } else {
1311 if (strcmp(key, "sun.java.command") == 0) {
1312 char *old_java_command = _java_command;
1313 _java_command = os::strdup_check_oom(value, mtArguments);
1314 if (old_java_command != NULL) {
1315 os::free(old_java_command);
1316 }
1317 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1318 // If this property is set on the command line then its value will be
1319 // displayed in VM error logs as the URL at which to submit such logs.
1320 // Normally the URL displayed in error logs is different from the value
1321 // of this system property, so a different property should have been
1322 // used here, but we leave this as-is in case someone depends upon it.
1323 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1324 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1325 // its value without going through the property list or making a Java call.
1326 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1327 if (old_java_vendor_url_bug != NULL) {
1328 os::free((void *)old_java_vendor_url_bug);
1329 }
1330 }
1331
1332 // Create new property and add at the end of the list
1333 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1334 }
1335
1336 if (key != prop) {
1337 // SystemProperty copy passed value, thus free previously allocated
1338 // memory
1339 FreeHeap((void *)key);
1340 }
1341
1342 return true;
1343 }
1344
1345 #if INCLUDE_CDS
1346 const char* unsupported_properties[] = { "jdk.module.limitmods",
1347 "jdk.module.upgrade.path",
1348 "jdk.module.patch.0" };
1349 const char* unsupported_options[] = { "--limit-modules",
1350 "--upgrade-module-path",
1351 "--patch-module"
1352 };
1353 void Arguments::check_unsupported_dumping_properties() {
1354 assert(is_dumping_archive(),
1355 "this function is only used with CDS dump time");
1356 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1357 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1358 SystemProperty* sp = system_properties();
1359 while (sp != NULL) {
1360 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1361 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1362 vm_exit_during_initialization(
1363 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1364 }
1365 }
1366 sp = sp->next();
1367 }
1368
1369 // Check for an exploded module build in use with -Xshare:dump.
1370 if (!has_jimage()) {
1371 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1372 }
1373 }
1374
1375 bool Arguments::check_unsupported_cds_runtime_properties() {
1376 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1377 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1378 if (ArchiveClassesAtExit != NULL) {
1379 // dynamic dumping, just return false for now.
1380 // check_unsupported_dumping_properties() will be called later to check the same set of
1381 // properties, and will exit the VM with the correct error message if the unsupported properties
1382 // are used.
1383 return false;
1384 }
1385 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1386 if (get_property(unsupported_properties[i]) != NULL) {
1387 if (RequireSharedSpaces) {
1388 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1389 } else {
1390 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1391 }
1392 return true;
1393 }
1394 }
1395 return false;
1396 }
1397 #endif
1398
1399 //===========================================================================================================
1400 // Setting int/mixed/comp mode flags
1401
1402 void Arguments::set_mode_flags(Mode mode) {
1403 // Set up default values for all flags.
1404 // If you add a flag to any of the branches below,
1405 // add a default value for it here.
1406 set_java_compiler(false);
1407 _mode = mode;
1408
1409 // Ensure Agent_OnLoad has the correct initial values.
1410 // This may not be the final mode; mode may change later in onload phase.
1411 PropertyList_unique_add(&_system_properties, "java.vm.info",
1412 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1413
1414 UseInterpreter = true;
1415 UseCompiler = true;
1416 UseLoopCounter = true;
1417
1418 // Default values may be platform/compiler dependent -
1419 // use the saved values
1420 ClipInlining = Arguments::_ClipInlining;
1421 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1422 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1423 BackgroundCompilation = Arguments::_BackgroundCompilation;
1424
1425 // Change from defaults based on mode
1426 switch (mode) {
1427 default:
1428 ShouldNotReachHere();
1429 break;
1430 case _int:
1431 UseCompiler = false;
1432 UseLoopCounter = false;
1433 AlwaysCompileLoopMethods = false;
1434 UseOnStackReplacement = false;
1435 break;
1436 case _mixed:
1437 // same as default
1438 break;
1439 case _comp:
1440 UseInterpreter = false;
1441 BackgroundCompilation = false;
1442 ClipInlining = false;
1443 break;
1444 }
1445 }
1446
1447 // Conflict: required to use shared spaces (-Xshare:on), but
1448 // incompatible command line options were chosen.
1449 static void no_shared_spaces(const char* message) {
1450 if (RequireSharedSpaces) {
1451 jio_fprintf(defaultStream::error_stream(),
1452 "Class data sharing is inconsistent with other specified options.\n");
1453 vm_exit_during_initialization("Unable to use shared archive", message);
1454 } else {
1455 log_info(cds)("Unable to use shared archive: %s", message);
1456 UseSharedSpaces = false;
1457 }
1458 }
1459
1460 void set_object_alignment() {
1461 // Object alignment.
1462 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1463 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1464 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1465 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1466 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1467 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1468
1469 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1470 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1471
1472 // Oop encoding heap max
1473 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1474 }
1475
1476 size_t Arguments::max_heap_for_compressed_oops() {
1477 // Avoid sign flip.
1478 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1479 // We need to fit both the NULL page and the heap into the memory budget, while
1480 // keeping alignment constraints of the heap. To guarantee the latter, as the
1481 // NULL page is located before the heap, we pad the NULL page to the conservative
1482 // maximum alignment that the GC may ever impose upon the heap.
1483 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1484 _conservative_max_heap_alignment);
1485
1486 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1487 NOT_LP64(ShouldNotReachHere(); return 0);
1488 }
1489
1490 void Arguments::set_use_compressed_oops() {
1491 #ifdef _LP64
1492 // MaxHeapSize is not set up properly at this point, but
1493 // the only value that can override MaxHeapSize if we are
1494 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1495 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1496
1497 if (max_heap_size <= max_heap_for_compressed_oops()) {
1498 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1499 FLAG_SET_ERGO(UseCompressedOops, true);
1500 }
1501 } else {
1502 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1503 warning("Max heap size too large for Compressed Oops");
1504 FLAG_SET_DEFAULT(UseCompressedOops, false);
1505 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1506 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1507 }
1508 }
1509 }
1510 #endif // _LP64
1511 }
1512
1513
1514 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1515 // set_use_compressed_oops().
1516 void Arguments::set_use_compressed_klass_ptrs() {
1517 #ifdef _LP64
1518 // On some architectures, the use of UseCompressedClassPointers implies the use of
1519 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1520 // is reused to perform some optimized spilling, in order to use rheap_base as a
1521 // temp register. But by treating it as any other temp register, spilling can typically
1522 // be completely avoided instead. So it is better not to perform this trick. And by
1523 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1524 // can still use compressed class pointers.
1525 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1526 if (UseCompressedClassPointers) {
1527 warning("UseCompressedClassPointers requires UseCompressedOops");
1528 }
1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1530 } else {
1531 // Turn on UseCompressedClassPointers too
1532 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1533 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1534 }
1535 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1536 if (UseCompressedClassPointers) {
1537 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1538 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1540 }
1541 }
1542 }
1543 #endif // _LP64
1544 }
1545
1546 void Arguments::set_conservative_max_heap_alignment() {
1547 // The conservative maximum required alignment for the heap is the maximum of
1548 // the alignments imposed by several sources: any requirements from the heap
1549 // itself and the maximum page size we may run the VM with.
1550 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1551 _conservative_max_heap_alignment = MAX4(heap_alignment,
1552 (size_t)os::vm_allocation_granularity(),
1553 os::max_page_size(),
1554 GCArguments::compute_heap_alignment());
1555 }
1556
1557 jint Arguments::set_ergonomics_flags() {
1558 GCConfig::initialize();
1559
1560 set_conservative_max_heap_alignment();
1561
1562 #ifdef _LP64
1563 set_use_compressed_oops();
1564
1565 // set_use_compressed_klass_ptrs() must be called after calling
1566 // set_use_compressed_oops().
1567 set_use_compressed_klass_ptrs();
1568
1569 // Also checks that certain machines are slower with compressed oops
1570 // in vm_version initialization code.
1571 #endif // _LP64
1572
1573 return JNI_OK;
1574 }
1575
1576 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1577 size_t max_allocatable;
1578 size_t result = limit;
1579 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1580 // The AggressiveHeap check is a temporary workaround to avoid calling
1581 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1582 // selected. This works because AggressiveHeap implies UseParallelGC
1583 // where we know the ratio will be 1. Once the AggressiveHeap option is
1584 // removed, this can be cleaned up.
1585 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1586 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1587 result = MIN2(result, max_allocatable / fraction);
1588 }
1589 return result;
1590 }
1591
1592 // Use static initialization to get the default before parsing
1593 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1594
1595 void Arguments::set_heap_size() {
1596 julong phys_mem;
1597
1598 // If the user specified one of these options, they
1599 // want specific memory sizing so do not limit memory
1600 // based on compressed oops addressability.
1601 // Also, memory limits will be calculated based on
1602 // available os physical memory, not our MaxRAM limit,
1603 // unless MaxRAM is also specified.
1604 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1605 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1606 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1607 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1608 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1609 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1610 !FLAG_IS_DEFAULT(MaxRAM));
1611 if (override_coop_limit) {
1612 if (FLAG_IS_DEFAULT(MaxRAM)) {
1613 phys_mem = os::physical_memory();
1614 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1615 } else {
1616 phys_mem = (julong)MaxRAM;
1617 }
1618 } else {
1619 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1620 : (julong)MaxRAM;
1621 }
1622
1623
1624 // Convert deprecated flags
1625 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1626 !FLAG_IS_DEFAULT(MaxRAMFraction))
1627 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1628
1629 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1630 !FLAG_IS_DEFAULT(MinRAMFraction))
1631 MinRAMPercentage = 100.0 / MinRAMFraction;
1632
1633 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1634 !FLAG_IS_DEFAULT(InitialRAMFraction))
1635 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1636
1637 // If the maximum heap size has not been set with -Xmx,
1638 // then set it as fraction of the size of physical memory,
1639 // respecting the maximum and minimum sizes of the heap.
1640 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1641 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1642 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1643 if (reasonable_min < MaxHeapSize) {
1644 // Small physical memory, so use a minimum fraction of it for the heap
1645 reasonable_max = reasonable_min;
1646 } else {
1647 // Not-small physical memory, so require a heap at least
1648 // as large as MaxHeapSize
1649 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1650 }
1651
1652 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1653 // Limit the heap size to ErgoHeapSizeLimit
1654 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1655 }
1656
1657 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1658
1659 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1660 // An initial heap size was specified on the command line,
1661 // so be sure that the maximum size is consistent. Done
1662 // after call to limit_heap_by_allocatable_memory because that
1663 // method might reduce the allocation size.
1664 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1665 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1666 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1667 }
1668
1669 #ifdef _LP64
1670 if (UseCompressedOops || UseCompressedClassPointers) {
1671 // HeapBaseMinAddress can be greater than default but not less than.
1672 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1673 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1674 // matches compressed oops printing flags
1675 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1676 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1677 DefaultHeapBaseMinAddress,
1678 DefaultHeapBaseMinAddress/G,
1679 HeapBaseMinAddress);
1680 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1681 }
1682 }
1683 }
1684 if (UseCompressedOops) {
1685 // Limit the heap size to the maximum possible when using compressed oops
1686 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1687
1688 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1689 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1690 // but it should be not less than default MaxHeapSize.
1691 max_coop_heap -= HeapBaseMinAddress;
1692 }
1693
1694 // If user specified flags prioritizing os physical
1695 // memory limits, then disable compressed oops if
1696 // limits exceed max_coop_heap and UseCompressedOops
1697 // was not specified.
1698 if (reasonable_max > max_coop_heap) {
1699 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1700 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1701 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1702 "Please check the setting of MaxRAMPercentage %5.2f."
1703 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1704 FLAG_SET_ERGO(UseCompressedOops, false);
1705 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1706 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1707 }
1708 } else {
1709 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1710 }
1711 }
1712 }
1713 #endif // _LP64
1714
1715 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1716 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1717 }
1718
1719 // If the minimum or initial heap_size have not been set or requested to be set
1720 // ergonomically, set them accordingly.
1721 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1722 julong reasonable_minimum = (julong)(OldSize + NewSize);
1723
1724 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1725
1726 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1727
1728 if (InitialHeapSize == 0) {
1729 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1730 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1731
1732 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1733 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1734
1735 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1736 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1737 }
1738 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1739 // synchronize with InitialHeapSize to avoid errors with the default value.
1740 if (MinHeapSize == 0) {
1741 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1742 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1743 }
1744 }
1745 }
1746
1747 // This option inspects the machine and attempts to set various
1748 // parameters to be optimal for long-running, memory allocation
1749 // intensive jobs. It is intended for machines with large
1750 // amounts of cpu and memory.
1751 jint Arguments::set_aggressive_heap_flags() {
1752 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1753 // VM, but we may not be able to represent the total physical memory
1754 // available (like having 8gb of memory on a box but using a 32bit VM).
1755 // Thus, we need to make sure we're using a julong for intermediate
1756 // calculations.
1757 julong initHeapSize;
1758 julong total_memory = os::physical_memory();
1759
1760 if (total_memory < (julong) 256 * M) {
1761 jio_fprintf(defaultStream::error_stream(),
1762 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1763 vm_exit(1);
1764 }
1765
1766 // The heap size is half of available memory, or (at most)
1767 // all of possible memory less 160mb (leaving room for the OS
1768 // when using ISM). This is the maximum; because adaptive sizing
1769 // is turned on below, the actual space used may be smaller.
1770
1771 initHeapSize = MIN2(total_memory / (julong) 2,
1772 total_memory - (julong) 160 * M);
1773
1774 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1775
1776 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1777 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1778 return JNI_EINVAL;
1779 }
1780 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1781 return JNI_EINVAL;
1782 }
1783 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1784 return JNI_EINVAL;
1785 }
1786 }
1787 if (FLAG_IS_DEFAULT(NewSize)) {
1788 // Make the young generation 3/8ths of the total heap.
1789 if (FLAG_SET_CMDLINE(NewSize,
1790 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1791 return JNI_EINVAL;
1792 }
1793 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1794 return JNI_EINVAL;
1795 }
1796 }
1797
1798 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1799 FLAG_SET_DEFAULT(UseLargePages, true);
1800 #endif
1801
1802 // Increase some data structure sizes for efficiency
1803 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1804 return JNI_EINVAL;
1805 }
1806 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1807 return JNI_EINVAL;
1808 }
1809 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1810 return JNI_EINVAL;
1811 }
1812
1813 // See the OldPLABSize comment below, but replace 'after promotion'
1814 // with 'after copying'. YoungPLABSize is the size of the survivor
1815 // space per-gc-thread buffers. The default is 4kw.
1816 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1817 return JNI_EINVAL;
1818 }
1819
1820 // OldPLABSize is the size of the buffers in the old gen that
1821 // UseParallelGC uses to promote live data that doesn't fit in the
1822 // survivor spaces. At any given time, there's one for each gc thread.
1823 // The default size is 1kw. These buffers are rarely used, since the
1824 // survivor spaces are usually big enough. For specjbb, however, there
1825 // are occasions when there's lots of live data in the young gen
1826 // and we end up promoting some of it. We don't have a definite
1827 // explanation for why bumping OldPLABSize helps, but the theory
1828 // is that a bigger PLAB results in retaining something like the
1829 // original allocation order after promotion, which improves mutator
1830 // locality. A minor effect may be that larger PLABs reduce the
1831 // number of PLAB allocation events during gc. The value of 8kw
1832 // was arrived at by experimenting with specjbb.
1833 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1834 return JNI_EINVAL;
1835 }
1836
1837 // Enable parallel GC and adaptive generation sizing
1838 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1839 return JNI_EINVAL;
1840 }
1841
1842 // Encourage steady state memory management
1843 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1844 return JNI_EINVAL;
1845 }
1846
1847 // This appears to improve mutator locality
1848 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1849 return JNI_EINVAL;
1850 }
1851
1852 return JNI_OK;
1853 }
1854
1855 // This must be called after ergonomics.
1856 void Arguments::set_bytecode_flags() {
1857 if (!RewriteBytecodes) {
1858 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1859 }
1860 }
1861
1862 // Aggressive optimization flags
1863 jint Arguments::set_aggressive_opts_flags() {
1864 #ifdef COMPILER2
1865 if (AggressiveUnboxing) {
1866 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1867 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1868 } else if (!EliminateAutoBox) {
1869 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1870 AggressiveUnboxing = false;
1871 }
1872 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1873 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1874 } else if (!DoEscapeAnalysis) {
1875 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1876 AggressiveUnboxing = false;
1877 }
1878 }
1879 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1880 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1881 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1882 }
1883 // Feed the cache size setting into the JDK
1884 char buffer[1024];
1885 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1886 if (!add_property(buffer)) {
1887 return JNI_ENOMEM;
1888 }
1889 }
1890 #endif
1891
1892 return JNI_OK;
1893 }
1894
1895 //===========================================================================================================
1896 // Parsing of java.compiler property
1897
1898 void Arguments::process_java_compiler_argument(const char* arg) {
1899 // For backwards compatibility, Djava.compiler=NONE or ""
1900 // causes us to switch to -Xint mode UNLESS -Xdebug
1901 // is also specified.
1902 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1903 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1904 }
1905 }
1906
1907 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1908 _sun_java_launcher = os::strdup_check_oom(launcher);
1909 }
1910
1911 bool Arguments::created_by_java_launcher() {
1912 assert(_sun_java_launcher != NULL, "property must have value");
1913 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1914 }
1915
1916 bool Arguments::sun_java_launcher_is_altjvm() {
1917 return _sun_java_launcher_is_altjvm;
1918 }
1919
1920 //===========================================================================================================
1921 // Parsing of main arguments
1922
1923 unsigned int addreads_count = 0;
1924 unsigned int addexports_count = 0;
1925 unsigned int addopens_count = 0;
1926 unsigned int addmods_count = 0;
1927 unsigned int enable_native_access_count = 0;
1928
1929 // Check the consistency of vm_init_args
1930 bool Arguments::check_vm_args_consistency() {
1931 // Method for adding checks for flag consistency.
1932 // The intent is to warn the user of all possible conflicts,
1933 // before returning an error.
1934 // Note: Needs platform-dependent factoring.
1935 bool status = true;
1936
1937 if (TLABRefillWasteFraction == 0) {
1938 jio_fprintf(defaultStream::error_stream(),
1939 "TLABRefillWasteFraction should be a denominator, "
1940 "not " SIZE_FORMAT "\n",
1941 TLABRefillWasteFraction);
1942 status = false;
1943 }
1944
1945 status = CompilerConfig::check_args_consistency(status);
1946 #if INCLUDE_JVMCI
1947 if (status && EnableJVMCI) {
1948 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1949 AddProperty, UnwriteableProperty, InternalProperty);
1950 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1951 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1952 return false;
1953 }
1954 }
1955 }
1956 #endif
1957
1958 #if INCLUDE_JFR
1959 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1960 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1961 return false;
1962 }
1963 }
1964 #endif
1965
1966 #ifndef SUPPORT_RESERVED_STACK_AREA
1967 if (StackReservedPages != 0) {
1968 FLAG_SET_CMDLINE(StackReservedPages, 0);
1969 warning("Reserved Stack Area not supported on this platform");
1970 }
1971 #endif
1972
1973 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) {
1974 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false);
1975 warning("InlineTypePassFieldsAsArgs is not supported on this platform");
1976 }
1977
1978 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) {
1979 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false);
1980 warning("InlineTypeReturnedAsFields is not supported on this platform");
1981 }
1982
1983 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64)
1984 if (UseHeavyMonitors) {
1985 jio_fprintf(defaultStream::error_stream(),
1986 "UseHeavyMonitors is not fully implemented on this architecture");
1987 return false;
1988 }
1989 #endif
1990 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
1991 if (UseHeavyMonitors && UseRTMForStackLocks) {
1992 jio_fprintf(defaultStream::error_stream(),
1993 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive");
1994
1995 return false;
1996 }
1997 #endif
1998 if (VerifyHeavyMonitors && !UseHeavyMonitors) {
1999 jio_fprintf(defaultStream::error_stream(),
2000 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors");
2001 return false;
2002 }
2003
2004 return status;
2005 }
2006
2007 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2008 const char* option_type) {
2009 if (ignore) return false;
2010
2011 const char* spacer = " ";
2012 if (option_type == NULL) {
2013 option_type = ++spacer; // Set both to the empty string.
2014 }
2015
2016 jio_fprintf(defaultStream::error_stream(),
2017 "Unrecognized %s%soption: %s\n", option_type, spacer,
2018 option->optionString);
2019 return true;
2020 }
2021
2022 static const char* user_assertion_options[] = {
2023 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2024 };
2025
2026 static const char* system_assertion_options[] = {
2027 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2028 };
2029
2030 bool Arguments::parse_uintx(const char* value,
2031 uintx* uintx_arg,
2032 uintx min_size) {
2033 uintx n;
2034 if (!parse_integer(value, &n)) {
2035 return false;
2036 }
2037 if (n >= min_size) {
2038 *uintx_arg = n;
2039 return true;
2040 } else {
2041 return false;
2042 }
2043 }
2044
2045 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2046 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2047 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2048 char* property = AllocateHeap(prop_len, mtArguments);
2049 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2050 if (ret < 0 || ret >= (int)prop_len) {
2051 FreeHeap(property);
2052 return false;
2053 }
2054 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2055 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2056 // that multiple occurrences of the associated flag just causes the existing property value to be
2057 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2058 // to a property after we have finished flag processing.
2059 bool added = add_property(property, WriteableProperty, internal);
2060 FreeHeap(property);
2061 return added;
2062 }
2063
2064 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2065 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2066 const unsigned int props_count_limit = 1000;
2067 const int max_digits = 3;
2068 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2069
2070 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2071 if (count < props_count_limit) {
2072 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2073 char* property = AllocateHeap(prop_len, mtArguments);
2074 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2075 if (ret < 0 || ret >= (int)prop_len) {
2076 FreeHeap(property);
2077 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2078 return false;
2079 }
2080 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2081 FreeHeap(property);
2082 return added;
2083 }
2084
2085 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2086 return false;
2087 }
2088
2089 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2090 julong* long_arg,
2091 julong min_size,
2092 julong max_size) {
2093 if (!parse_integer(s, long_arg)) return arg_unreadable;
2094 return check_memory_size(*long_arg, min_size, max_size);
2095 }
2096
2097 // Parse JavaVMInitArgs structure
2098
2099 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2100 const JavaVMInitArgs *java_tool_options_args,
2101 const JavaVMInitArgs *java_options_args,
2102 const JavaVMInitArgs *cmd_line_args) {
2103 // Save default settings for some mode flags
2104 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2105 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2106 Arguments::_ClipInlining = ClipInlining;
2107 Arguments::_BackgroundCompilation = BackgroundCompilation;
2108
2109 // Remember the default value of SharedBaseAddress.
2110 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2111
2112 // Setup flags for mixed which is the default
2113 set_mode_flags(_mixed);
2114
2115 // Parse args structure generated from java.base vm options resource
2116 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
2117 if (result != JNI_OK) {
2118 return result;
2119 }
2120
2121 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2122 // variable (if present).
2123 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
2124 if (result != JNI_OK) {
2125 return result;
2126 }
2127
2128 // Parse args structure generated from the command line flags.
2129 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
2130 if (result != JNI_OK) {
2131 return result;
2132 }
2133
2134 // Parse args structure generated from the _JAVA_OPTIONS environment
2135 // variable (if present) (mimics classic VM)
2136 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
2137 if (result != JNI_OK) {
2138 return result;
2139 }
2140
2141 // We need to ensure processor and memory resources have been properly
2142 // configured - which may rely on arguments we just processed - before
2143 // doing the final argument processing. Any argument processing that
2144 // needs to know about processor and memory resources must occur after
2145 // this point.
2146
2147 os::init_container_support();
2148
2149 // Do final processing now that all arguments have been parsed
2150 result = finalize_vm_init_args();
2151 if (result != JNI_OK) {
2152 return result;
2153 }
2154
2155 return JNI_OK;
2156 }
2157
2158 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2159 // represents a valid JDWP agent. is_path==true denotes that we
2160 // are dealing with -agentpath (case where name is a path), otherwise with
2161 // -agentlib
2162 bool valid_jdwp_agent(char *name, bool is_path) {
2163 char *_name;
2164 const char *_jdwp = "jdwp";
2165 size_t _len_jdwp, _len_prefix;
2166
2167 if (is_path) {
2168 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2169 return false;
2170 }
2171
2172 _name++; // skip past last path separator
2173 _len_prefix = strlen(JNI_LIB_PREFIX);
2174
2175 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2176 return false;
2177 }
2178
2179 _name += _len_prefix;
2180 _len_jdwp = strlen(_jdwp);
2181
2182 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2183 _name += _len_jdwp;
2184 }
2185 else {
2186 return false;
2187 }
2188
2189 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2190 return false;
2191 }
2192
2193 return true;
2194 }
2195
2196 if (strcmp(name, _jdwp) == 0) {
2197 return true;
2198 }
2199
2200 return false;
2201 }
2202
2203 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2204 // --patch-module=<module>=<file>(<pathsep><file>)*
2205 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2206 // Find the equal sign between the module name and the path specification
2207 const char* module_equal = strchr(patch_mod_tail, '=');
2208 if (module_equal == NULL) {
2209 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2210 return JNI_ERR;
2211 } else {
2212 // Pick out the module name
2213 size_t module_len = module_equal - patch_mod_tail;
2214 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2215 if (module_name != NULL) {
2216 memcpy(module_name, patch_mod_tail, module_len);
2217 *(module_name + module_len) = '\0';
2218 // The path piece begins one past the module_equal sign
2219 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */);
2220 FREE_C_HEAP_ARRAY(char, module_name);
2221 } else {
2222 return JNI_ENOMEM;
2223 }
2224 }
2225 return JNI_OK;
2226 }
2227
2228 // VALUECLASS_STR must match string used in the build
2229 #define VALUECLASS_STR "valueclasses"
2230 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2231
2232 // Finalize --patch-module args and --enable-preview related to value class module patches.
2233 // Create all numbered properties passing module patches.
2234 int Arguments::finalize_patch_module() {
2235 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2236 // are to be patched into the module.
2237 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2238 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2239 if (enable_preview() && EnableValhalla) {
2240 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2241 const char * fileSep = os::file_separator();
2242
2243 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2244 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2245 DIR* dir = os::opendir(valueclasses_dir);
2246 if (dir != nullptr) {
2247 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2248 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2249
2250 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2251 // Test if file ends-with "-valueclasses.jar"
2252 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2253 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2254 continue; // too short or not the expected suffix
2255 }
2256
2257 strcpy(module_name, entry->d_name);
2258 module_name[len] = '\0'; // truncate to just module-name
2259
2260 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2261 add_patch_mod_prefix(module_name, path, true /* append */);
2262 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2263 }
2264 FreeHeap(module_name);
2265 FreeHeap(path);
2266 os::closedir(dir);
2267 }
2268 FreeHeap(valueclasses_dir);
2269 }
2270
2271 // Create numbered properties for each module that has been patched either
2272 // by --patch-module or --enable-preview
2273 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2274 if (_patch_mod_prefix != nullptr) {
2275 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2276 unsigned int patch_mod_count = 0;
2277
2278 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2279 it != _patch_mod_prefix->end(); ++it) {
2280 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2281 (*it)->module_name(), (*it)->path_string());
2282 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2283 FreeHeap(prop_value);
2284 return JNI_ENOMEM;
2285 }
2286 }
2287 FreeHeap(prop_value);
2288 }
2289 return JNI_OK;
2290 }
2291
2292 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2293 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2294 // The min and max sizes match the values in globals.hpp, but scaled
2295 // with K. The values have been chosen so that alignment with page
2296 // size doesn't change the max value, which makes the conversions
2297 // back and forth between Xss value and ThreadStackSize value easier.
2298 // The values have also been chosen to fit inside a 32-bit signed type.
2299 const julong min_ThreadStackSize = 0;
2300 const julong max_ThreadStackSize = 1 * M;
2301
2302 // Make sure the above values match the range set in globals.hpp
2303 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2304 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2305 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2306
2307 const julong min_size = min_ThreadStackSize * K;
2308 const julong max_size = max_ThreadStackSize * K;
2309
2310 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2311
2312 julong size = 0;
2313 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2314 if (errcode != arg_in_range) {
2315 bool silent = (option == NULL); // Allow testing to silence error messages
2316 if (!silent) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Invalid thread stack size: %s\n", option->optionString);
2319 describe_range_error(errcode);
2320 }
2321 return JNI_EINVAL;
2322 }
2323
2324 // Internally track ThreadStackSize in units of 1024 bytes.
2325 const julong size_aligned = align_up(size, K);
2326 assert(size <= size_aligned,
2327 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2328 size, size_aligned);
2329
2330 const julong size_in_K = size_aligned / K;
2331 assert(size_in_K < (julong)max_intx,
2332 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2333 size_in_K);
2334
2335 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2336 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2337 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2338 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2339 max_expanded, size_in_K);
2340
2341 *out_ThreadStackSize = (intx)size_in_K;
2342
2343 return JNI_OK;
2344 }
2345
2346 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2347 // For match_option to return remaining or value part of option string
2348 const char* tail;
2349
2350 // iterate over arguments
2351 for (int index = 0; index < args->nOptions; index++) {
2352 bool is_absolute_path = false; // for -agentpath vs -agentlib
2353
2354 const JavaVMOption* option = args->options + index;
2355
2356 if (!match_option(option, "-Djava.class.path", &tail) &&
2357 !match_option(option, "-Dsun.java.command", &tail) &&
2358 !match_option(option, "-Dsun.java.launcher", &tail)) {
2359
2360 // add all jvm options to the jvm_args string. This string
2361 // is used later to set the java.vm.args PerfData string constant.
2362 // the -Djava.class.path and the -Dsun.java.command options are
2363 // omitted from jvm_args string as each have their own PerfData
2364 // string constant object.
2365 build_jvm_args(option->optionString);
2366 }
2367
2368 // -verbose:[class/module/gc/jni]
2369 if (match_option(option, "-verbose", &tail)) {
2370 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2371 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2372 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2373 } else if (!strcmp(tail, ":module")) {
2374 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2375 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2376 } else if (!strcmp(tail, ":gc")) {
2377 if (_legacyGCLogging.lastFlag == 0) {
2378 _legacyGCLogging.lastFlag = 1;
2379 }
2380 } else if (!strcmp(tail, ":jni")) {
2381 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2382 }
2383 // -da / -ea / -disableassertions / -enableassertions
2384 // These accept an optional class/package name separated by a colon, e.g.,
2385 // -da:java.lang.Thread.
2386 } else if (match_option(option, user_assertion_options, &tail, true)) {
2387 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2388 if (*tail == '\0') {
2389 JavaAssertions::setUserClassDefault(enable);
2390 } else {
2391 assert(*tail == ':', "bogus match by match_option()");
2392 JavaAssertions::addOption(tail + 1, enable);
2393 }
2394 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2395 } else if (match_option(option, system_assertion_options, &tail, false)) {
2396 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2397 JavaAssertions::setSystemClassDefault(enable);
2398 // -bootclasspath:
2399 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2400 jio_fprintf(defaultStream::output_stream(),
2401 "-Xbootclasspath is no longer a supported option.\n");
2402 return JNI_EINVAL;
2403 // -bootclasspath/a:
2404 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2405 Arguments::append_sysclasspath(tail);
2406 #if INCLUDE_CDS
2407 MetaspaceShared::disable_optimized_module_handling();
2408 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2409 #endif
2410 // -bootclasspath/p:
2411 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2412 jio_fprintf(defaultStream::output_stream(),
2413 "-Xbootclasspath/p is no longer a supported option.\n");
2414 return JNI_EINVAL;
2415 // -Xrun
2416 } else if (match_option(option, "-Xrun", &tail)) {
2417 if (tail != NULL) {
2418 const char* pos = strchr(tail, ':');
2419 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2420 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2421 jio_snprintf(name, len + 1, "%s", tail);
2422
2423 char *options = NULL;
2424 if(pos != NULL) {
2425 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2426 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2427 }
2428 #if !INCLUDE_JVMTI
2429 if (strcmp(name, "jdwp") == 0) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Debugging agents are not supported in this VM\n");
2432 return JNI_ERR;
2433 }
2434 #endif // !INCLUDE_JVMTI
2435 add_init_library(name, options);
2436 }
2437 } else if (match_option(option, "--add-reads=", &tail)) {
2438 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2439 return JNI_ENOMEM;
2440 }
2441 } else if (match_option(option, "--add-exports=", &tail)) {
2442 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2443 return JNI_ENOMEM;
2444 }
2445 } else if (match_option(option, "--add-opens=", &tail)) {
2446 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2447 return JNI_ENOMEM;
2448 }
2449 } else if (match_option(option, "--add-modules=", &tail)) {
2450 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2451 return JNI_ENOMEM;
2452 }
2453 } else if (match_option(option, "--enable-native-access=", &tail)) {
2454 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2455 return JNI_ENOMEM;
2456 }
2457 } else if (match_option(option, "--limit-modules=", &tail)) {
2458 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2459 return JNI_ENOMEM;
2460 }
2461 } else if (match_option(option, "--module-path=", &tail)) {
2462 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2463 return JNI_ENOMEM;
2464 }
2465 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2466 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2467 return JNI_ENOMEM;
2468 }
2469 } else if (match_option(option, "--patch-module=", &tail)) {
2470 // --patch-module=<module>=<file>(<pathsep><file>)*
2471 int res = process_patch_mod_option(tail);
2472 if (res != JNI_OK) {
2473 return res;
2474 }
2475 } else if (match_option(option, "--illegal-access=", &tail)) {
2476 char version[256];
2477 JDK_Version::jdk(17).to_string(version, sizeof(version));
2478 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2479 // -agentlib and -agentpath
2480 } else if (match_option(option, "-agentlib:", &tail) ||
2481 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2482 if(tail != NULL) {
2483 const char* pos = strchr(tail, '=');
2484 char* name;
2485 if (pos == NULL) {
2486 name = os::strdup_check_oom(tail, mtArguments);
2487 } else {
2488 size_t len = pos - tail;
2489 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2490 memcpy(name, tail, len);
2491 name[len] = '\0';
2492 }
2493
2494 char *options = NULL;
2495 if(pos != NULL) {
2496 options = os::strdup_check_oom(pos + 1, mtArguments);
2497 }
2498 #if !INCLUDE_JVMTI
2499 if (valid_jdwp_agent(name, is_absolute_path)) {
2500 jio_fprintf(defaultStream::error_stream(),
2501 "Debugging agents are not supported in this VM\n");
2502 return JNI_ERR;
2503 }
2504 #endif // !INCLUDE_JVMTI
2505 add_init_agent(name, options, is_absolute_path);
2506 }
2507 // -javaagent
2508 } else if (match_option(option, "-javaagent:", &tail)) {
2509 #if !INCLUDE_JVMTI
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Instrumentation agents are not supported in this VM\n");
2512 return JNI_ERR;
2513 #else
2514 if (tail != NULL) {
2515 size_t length = strlen(tail) + 1;
2516 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2517 jio_snprintf(options, length, "%s", tail);
2518 add_instrument_agent("instrument", options, false);
2519 // java agents need module java.instrument
2520 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2521 return JNI_ENOMEM;
2522 }
2523 }
2524 #endif // !INCLUDE_JVMTI
2525 // --enable_preview
2526 } else if (match_option(option, "--enable-preview")) {
2527 set_enable_preview();
2528 // -Xnoclassgc
2529 } else if (match_option(option, "-Xnoclassgc")) {
2530 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2531 return JNI_EINVAL;
2532 }
2533 // -Xbatch
2534 } else if (match_option(option, "-Xbatch")) {
2535 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 // -Xmn for compatibility with other JVM vendors
2539 } else if (match_option(option, "-Xmn", &tail)) {
2540 julong long_initial_young_size = 0;
2541 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2542 if (errcode != arg_in_range) {
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Invalid initial young generation size: %s\n", option->optionString);
2545 describe_range_error(errcode);
2546 return JNI_EINVAL;
2547 }
2548 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2552 return JNI_EINVAL;
2553 }
2554 // -Xms
2555 } else if (match_option(option, "-Xms", &tail)) {
2556 julong size = 0;
2557 // an initial heap size of 0 means automatically determine
2558 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2559 if (errcode != arg_in_range) {
2560 jio_fprintf(defaultStream::error_stream(),
2561 "Invalid initial heap size: %s\n", option->optionString);
2562 describe_range_error(errcode);
2563 return JNI_EINVAL;
2564 }
2565 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 // -Xmx
2572 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2573 julong long_max_heap_size = 0;
2574 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2575 if (errcode != arg_in_range) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Invalid maximum heap size: %s\n", option->optionString);
2578 describe_range_error(errcode);
2579 return JNI_EINVAL;
2580 }
2581 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 // Xmaxf
2585 } else if (match_option(option, "-Xmaxf", &tail)) {
2586 char* err;
2587 int maxf = (int)(strtod(tail, &err) * 100);
2588 if (*err != '\0' || *tail == '\0') {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Bad max heap free percentage size: %s\n",
2591 option->optionString);
2592 return JNI_EINVAL;
2593 } else {
2594 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 }
2598 // Xminf
2599 } else if (match_option(option, "-Xminf", &tail)) {
2600 char* err;
2601 int minf = (int)(strtod(tail, &err) * 100);
2602 if (*err != '\0' || *tail == '\0') {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Bad min heap free percentage size: %s\n",
2605 option->optionString);
2606 return JNI_EINVAL;
2607 } else {
2608 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2609 return JNI_EINVAL;
2610 }
2611 }
2612 // -Xss
2613 } else if (match_option(option, "-Xss", &tail)) {
2614 intx value = 0;
2615 jint err = parse_xss(option, tail, &value);
2616 if (err != JNI_OK) {
2617 return err;
2618 }
2619 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2623 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2624 julong long_ReservedCodeCacheSize = 0;
2625
2626 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2627 if (errcode != arg_in_range) {
2628 jio_fprintf(defaultStream::error_stream(),
2629 "Invalid maximum code cache size: %s.\n", option->optionString);
2630 return JNI_EINVAL;
2631 }
2632 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 // -green
2636 } else if (match_option(option, "-green")) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Green threads support not available\n");
2639 return JNI_EINVAL;
2640 // -native
2641 } else if (match_option(option, "-native")) {
2642 // HotSpot always uses native threads, ignore silently for compatibility
2643 // -Xrs
2644 } else if (match_option(option, "-Xrs")) {
2645 // Classic/EVM option, new functionality
2646 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 // -Xprof
2650 } else if (match_option(option, "-Xprof")) {
2651 char version[256];
2652 // Obsolete in JDK 10
2653 JDK_Version::jdk(10).to_string(version, sizeof(version));
2654 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2655 // -Xinternalversion
2656 } else if (match_option(option, "-Xinternalversion")) {
2657 jio_fprintf(defaultStream::output_stream(), "%s\n",
2658 VM_Version::internal_vm_info_string());
2659 vm_exit(0);
2660 #ifndef PRODUCT
2661 // -Xprintflags
2662 } else if (match_option(option, "-Xprintflags")) {
2663 JVMFlag::printFlags(tty, false);
2664 vm_exit(0);
2665 #endif
2666 // -D
2667 } else if (match_option(option, "-D", &tail)) {
2668 const char* value;
2669 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2670 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2671 // abort if -Djava.endorsed.dirs is set
2672 jio_fprintf(defaultStream::output_stream(),
2673 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2674 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2675 return JNI_EINVAL;
2676 }
2677 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2678 *value != '\0' && strcmp(value, "\"\"") != 0) {
2679 // abort if -Djava.ext.dirs is set
2680 jio_fprintf(defaultStream::output_stream(),
2681 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2682 return JNI_EINVAL;
2683 }
2684 // Check for module related properties. They must be set using the modules
2685 // options. For example: use "--add-modules=java.sql", not
2686 // "-Djdk.module.addmods=java.sql"
2687 if (is_internal_module_property(option->optionString + 2)) {
2688 needs_module_property_warning = true;
2689 continue;
2690 }
2691 if (!add_property(tail)) {
2692 return JNI_ENOMEM;
2693 }
2694 // Out of the box management support
2695 if (match_option(option, "-Dcom.sun.management", &tail)) {
2696 #if INCLUDE_MANAGEMENT
2697 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 // management agent in module jdk.management.agent
2701 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2702 return JNI_ENOMEM;
2703 }
2704 #else
2705 jio_fprintf(defaultStream::output_stream(),
2706 "-Dcom.sun.management is not supported in this VM.\n");
2707 return JNI_ERR;
2708 #endif
2709 }
2710 // -Xint
2711 } else if (match_option(option, "-Xint")) {
2712 set_mode_flags(_int);
2713 // -Xmixed
2714 } else if (match_option(option, "-Xmixed")) {
2715 set_mode_flags(_mixed);
2716 // -Xcomp
2717 } else if (match_option(option, "-Xcomp")) {
2718 // for testing the compiler; turn off all flags that inhibit compilation
2719 set_mode_flags(_comp);
2720 // -Xshare:dump
2721 } else if (match_option(option, "-Xshare:dump")) {
2722 DumpSharedSpaces = true;
2723 // -Xshare:on
2724 } else if (match_option(option, "-Xshare:on")) {
2725 UseSharedSpaces = true;
2726 RequireSharedSpaces = true;
2727 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2728 } else if (match_option(option, "-Xshare:auto")) {
2729 UseSharedSpaces = true;
2730 RequireSharedSpaces = false;
2731 xshare_auto_cmd_line = true;
2732 // -Xshare:off
2733 } else if (match_option(option, "-Xshare:off")) {
2734 UseSharedSpaces = false;
2735 RequireSharedSpaces = false;
2736 // -Xverify
2737 } else if (match_option(option, "-Xverify", &tail)) {
2738 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2739 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 } else if (strcmp(tail, ":remote") == 0) {
2746 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 } else if (strcmp(tail, ":none") == 0) {
2753 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2760 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2761 return JNI_EINVAL;
2762 }
2763 // -Xdebug
2764 } else if (match_option(option, "-Xdebug")) {
2765 // note this flag has been used, then ignore
2766 set_xdebug_mode(true);
2767 // -Xnoagent
2768 } else if (match_option(option, "-Xnoagent")) {
2769 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2770 } else if (match_option(option, "-Xloggc:", &tail)) {
2771 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2772 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2773 _legacyGCLogging.lastFlag = 2;
2774 _legacyGCLogging.file = os::strdup_check_oom(tail);
2775 } else if (match_option(option, "-Xlog", &tail)) {
2776 bool ret = false;
2777 if (strcmp(tail, ":help") == 0) {
2778 fileStream stream(defaultStream::output_stream());
2779 LogConfiguration::print_command_line_help(&stream);
2780 vm_exit(0);
2781 } else if (strcmp(tail, ":disable") == 0) {
2782 LogConfiguration::disable_logging();
2783 ret = true;
2784 } else if (strcmp(tail, ":async") == 0) {
2785 LogConfiguration::set_async_mode(true);
2786 ret = true;
2787 } else if (*tail == '\0') {
2788 ret = LogConfiguration::parse_command_line_arguments();
2789 assert(ret, "-Xlog without arguments should never fail to parse");
2790 } else if (*tail == ':') {
2791 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2792 }
2793 if (ret == false) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2796 tail);
2797 return JNI_EINVAL;
2798 }
2799 // JNI hooks
2800 } else if (match_option(option, "-Xcheck", &tail)) {
2801 if (!strcmp(tail, ":jni")) {
2802 #if !INCLUDE_JNI_CHECK
2803 warning("JNI CHECKING is not supported in this VM");
2804 #else
2805 CheckJNICalls = true;
2806 #endif // INCLUDE_JNI_CHECK
2807 } else if (is_bad_option(option, args->ignoreUnrecognized,
2808 "check")) {
2809 return JNI_EINVAL;
2810 }
2811 } else if (match_option(option, "vfprintf")) {
2812 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2813 } else if (match_option(option, "exit")) {
2814 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2815 } else if (match_option(option, "abort")) {
2816 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2817 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2818 // and the last option wins.
2819 } else if (match_option(option, "-XX:+NeverTenure")) {
2820 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2824 return JNI_EINVAL;
2825 }
2826 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2830 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2840 uintx max_tenuring_thresh = 0;
2841 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2844 return JNI_EINVAL;
2845 }
2846
2847 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850
2851 if (MaxTenuringThreshold == 0) {
2852 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 } else {
2859 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 }
2866 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2867 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2874 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2881 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2888 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 } else if (match_option(option, "--finalization=", &tail)) {
2895 if (strcmp(tail, "enabled") == 0) {
2896 InstanceKlass::set_finalization_enabled(true);
2897 } else if (strcmp(tail, "disabled") == 0) {
2898 InstanceKlass::set_finalization_enabled(false);
2899 } else {
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2902 tail);
2903 return JNI_EINVAL;
2904 }
2905 #if !defined(DTRACE_ENABLED)
2906 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2907 jio_fprintf(defaultStream::error_stream(),
2908 "DTraceMethodProbes flag is not applicable for this configuration\n");
2909 return JNI_EINVAL;
2910 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "DTraceAllocProbes flag is not applicable for this configuration\n");
2913 return JNI_EINVAL;
2914 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2915 jio_fprintf(defaultStream::error_stream(),
2916 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2917 return JNI_EINVAL;
2918 #endif // !defined(DTRACE_ENABLED)
2919 #ifdef ASSERT
2920 } else if (match_option(option, "-XX:+FullGCALot")) {
2921 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 // disable scavenge before parallel mark-compact
2925 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 #endif
2929 #if !INCLUDE_MANAGEMENT
2930 } else if (match_option(option, "-XX:+ManagementServer")) {
2931 jio_fprintf(defaultStream::error_stream(),
2932 "ManagementServer is not supported in this VM.\n");
2933 return JNI_ERR;
2934 #endif // INCLUDE_MANAGEMENT
2935 #if INCLUDE_JVMCI
2936 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2937 if (EnableJVMCIProduct) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2940 return JNI_EINVAL;
2941 }
2942 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2943 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2944 if (EnableJVMCIProduct) {
2945 continue;
2946 }
2947 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2948 // Allow this flag if it has been unlocked.
2949 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2950 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Unable to enable JVMCI in product mode");
2953 return JNI_ERR;
2954 }
2955 }
2956 // The flag was locked so process normally to report that error
2957 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2958 return JNI_EINVAL;
2959 }
2960 #endif // INCLUDE_JVMCI
2961 #if INCLUDE_JFR
2962 } else if (match_jfr_option(&option)) {
2963 return JNI_EINVAL;
2964 #endif
2965 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2966 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2967 // already been handled
2968 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2969 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2970 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2971 return JNI_EINVAL;
2972 }
2973 }
2974 // Unknown option
2975 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2976 return JNI_ERR;
2977 }
2978 }
2979
2980 if (!EnableValhalla && EnablePrimitiveClasses) {
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Cannot specify -XX:+EnablePrimitiveClasses without -XX:+EnableValhalla");
2983 return JNI_EINVAL;
2984 }
2985
2986 // PrintSharedArchiveAndExit will turn on
2987 // -Xshare:on
2988 // -Xlog:class+path=info
2989 if (PrintSharedArchiveAndExit) {
2990 UseSharedSpaces = true;
2991 RequireSharedSpaces = true;
2992 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2993 }
2994
2995 fix_appclasspath();
2996
2997 return JNI_OK;
2998 }
2999
3000 bool match_module(void *module_name, ModulePatchPath *patch) {
3001 return (strcmp((char *)module_name, patch->module_name()) == 0);
3002 }
3003
3004 bool Arguments::patch_mod_javabase() {
3005 return _patch_mod_prefix != nullptr && _patch_mod_prefix->find((void*)JAVA_BASE_NAME, match_module) >= 0;
3006 }
3007
3008 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append) {
3009 // Create GrowableArray lazily, only if --patch-module has been specified
3010 if (_patch_mod_prefix == nullptr) {
3011 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
3012 }
3013
3014 // Scan patches for matching module
3015 int i = _patch_mod_prefix->find((void*)module_name, match_module);
3016 if (i == -1) {
3017 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3018 } else {
3019 if (allow_append) {
3020 // append path to existing module entry
3021 _patch_mod_prefix->at(i)->append_path(path);
3022 } else {
3023 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3024 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3025 } else {
3026 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
3027 }
3028 }
3029 }
3030 }
3031
3032 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3033 //
3034 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3035 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3036 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3037 // path is treated as the current directory.
3038 //
3039 // This causes problems with CDS, which requires that all directories specified in the classpath
3040 // must be empty. In most cases, applications do NOT want to load classes from the current
3041 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3042 // scripts compatible with CDS.
3043 void Arguments::fix_appclasspath() {
3044 if (IgnoreEmptyClassPaths) {
3045 const char separator = *os::path_separator();
3046 const char* src = _java_class_path->value();
3047
3048 // skip over all the leading empty paths
3049 while (*src == separator) {
3050 src ++;
3051 }
3052
3053 char* copy = os::strdup_check_oom(src, mtArguments);
3054
3055 // trim all trailing empty paths
3056 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3057 *tail = '\0';
3058 }
3059
3060 char from[3] = {separator, separator, '\0'};
3061 char to [2] = {separator, '\0'};
3062 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3063 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3064 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3065 }
3066
3067 _java_class_path->set_writeable_value(copy);
3068 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3069 }
3070 }
3071
3072 jint Arguments::finalize_vm_init_args() {
3073 // check if the default lib/endorsed directory exists; if so, error
3074 char path[JVM_MAXPATHLEN];
3075 const char* fileSep = os::file_separator();
3076 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3077
3078 DIR* dir = os::opendir(path);
3079 if (dir != NULL) {
3080 jio_fprintf(defaultStream::output_stream(),
3081 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3082 "in modular form will be supported via the concept of upgradeable modules.\n");
3083 os::closedir(dir);
3084 return JNI_ERR;
3085 }
3086
3087 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3088 dir = os::opendir(path);
3089 if (dir != NULL) {
3090 jio_fprintf(defaultStream::output_stream(),
3091 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3092 "Use -classpath instead.\n.");
3093 os::closedir(dir);
3094 return JNI_ERR;
3095 }
3096
3097 // This must be done after all arguments have been processed
3098 // and the container support has been initialized since AggressiveHeap
3099 // relies on the amount of total memory available.
3100 if (AggressiveHeap) {
3101 jint result = set_aggressive_heap_flags();
3102 if (result != JNI_OK) {
3103 return result;
3104 }
3105 }
3106
3107 // This must be done after all arguments have been processed.
3108 // java_compiler() true means set to "NONE" or empty.
3109 if (java_compiler() && !xdebug_mode()) {
3110 // For backwards compatibility, we switch to interpreted mode if
3111 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3112 // not specified.
3113 set_mode_flags(_int);
3114 }
3115
3116 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3117 // but like -Xint, leave compilation thresholds unaffected.
3118 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3119 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3120 set_mode_flags(_int);
3121 }
3122
3123 #ifdef ZERO
3124 // Zero always runs in interpreted mode
3125 set_mode_flags(_int);
3126 #endif
3127
3128 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3129 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3130 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3131 }
3132
3133 #if !COMPILER2_OR_JVMCI
3134 // Don't degrade server performance for footprint
3135 if (FLAG_IS_DEFAULT(UseLargePages) &&
3136 MaxHeapSize < LargePageHeapSizeThreshold) {
3137 // No need for large granularity pages w/small heaps.
3138 // Note that large pages are enabled/disabled for both the
3139 // Java heap and the code cache.
3140 FLAG_SET_DEFAULT(UseLargePages, false);
3141 }
3142
3143 UNSUPPORTED_OPTION(ProfileInterpreter);
3144 #endif
3145
3146 // Parse the CompilationMode flag
3147 if (!CompilationModeFlag::initialize()) {
3148 return JNI_ERR;
3149 }
3150
3151 if (!check_vm_args_consistency()) {
3152 return JNI_ERR;
3153 }
3154
3155 // finalize --module-patch and related --enable-preview
3156 if (finalize_patch_module() != JNI_OK) {
3157 return JNI_ERR;
3158 }
3159
3160 #if INCLUDE_CDS
3161 if (DumpSharedSpaces) {
3162 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3163 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3164 // compiler just to be safe.
3165 //
3166 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3167 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3168 // TODO: revisit the following for the static archive case.
3169 set_mode_flags(_int);
3170 }
3171
3172 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3173 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3174 jio_fprintf(defaultStream::output_stream(),
3175 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3176 return JNI_ERR;
3177 }
3178
3179 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3180 DynamicDumpSharedSpaces = false;
3181 } else {
3182 DynamicDumpSharedSpaces = true;
3183 }
3184
3185 if (AutoCreateSharedArchive) {
3186 if (SharedArchiveFile == NULL) {
3187 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3188 return JNI_ERR;
3189 }
3190 if (ArchiveClassesAtExit != NULL) {
3191 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3192 return JNI_ERR;
3193 }
3194 }
3195
3196 if (UseSharedSpaces && patch_mod_javabase()) {
3197 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3198 }
3199 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3200 UseSharedSpaces = false;
3201 }
3202
3203 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3204 // Always verify non-system classes during CDS dump
3205 if (!BytecodeVerificationRemote) {
3206 BytecodeVerificationRemote = true;
3207 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3208 }
3209 }
3210 #endif
3211
3212 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3213 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3214 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3215
3216 return JNI_OK;
3217 }
3218
3219 // Helper class for controlling the lifetime of JavaVMInitArgs
3220 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3221 // deleted on the destruction of the ScopedVMInitArgs object.
3222 class ScopedVMInitArgs : public StackObj {
3223 private:
3224 JavaVMInitArgs _args;
3225 char* _container_name;
3226 bool _is_set;
3227 char* _vm_options_file_arg;
3228
3229 public:
3230 ScopedVMInitArgs(const char *container_name) {
3231 _args.version = JNI_VERSION_1_2;
3232 _args.nOptions = 0;
3233 _args.options = NULL;
3234 _args.ignoreUnrecognized = false;
3235 _container_name = (char *)container_name;
3236 _is_set = false;
3237 _vm_options_file_arg = NULL;
3238 }
3239
3240 // Populates the JavaVMInitArgs object represented by this
3241 // ScopedVMInitArgs object with the arguments in options. The
3242 // allocated memory is deleted by the destructor. If this method
3243 // returns anything other than JNI_OK, then this object is in a
3244 // partially constructed state, and should be abandoned.
3245 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3246 _is_set = true;
3247 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3248 JavaVMOption, options->length(), mtArguments);
3249 if (options_arr == NULL) {
3250 return JNI_ENOMEM;
3251 }
3252 _args.options = options_arr;
3253
3254 for (int i = 0; i < options->length(); i++) {
3255 options_arr[i] = options->at(i);
3256 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3257 if (options_arr[i].optionString == NULL) {
3258 // Rely on the destructor to do cleanup.
3259 _args.nOptions = i;
3260 return JNI_ENOMEM;
3261 }
3262 }
3263
3264 _args.nOptions = options->length();
3265 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3266 return JNI_OK;
3267 }
3268
3269 JavaVMInitArgs* get() { return &_args; }
3270 char* container_name() { return _container_name; }
3271 bool is_set() { return _is_set; }
3272 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3273 char* vm_options_file_arg() { return _vm_options_file_arg; }
3274
3275 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3276 if (_vm_options_file_arg != NULL) {
3277 os::free(_vm_options_file_arg);
3278 }
3279 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3280 }
3281
3282 ~ScopedVMInitArgs() {
3283 if (_vm_options_file_arg != NULL) {
3284 os::free(_vm_options_file_arg);
3285 }
3286 if (_args.options == NULL) return;
3287 for (int i = 0; i < _args.nOptions; i++) {
3288 os::free(_args.options[i].optionString);
3289 }
3290 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3291 }
3292
3293 // Insert options into this option list, to replace option at
3294 // vm_options_file_pos (-XX:VMOptionsFile)
3295 jint insert(const JavaVMInitArgs* args,
3296 const JavaVMInitArgs* args_to_insert,
3297 const int vm_options_file_pos) {
3298 assert(_args.options == NULL, "shouldn't be set yet");
3299 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3300 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3301
3302 int length = args->nOptions + args_to_insert->nOptions - 1;
3303 // Construct new option array
3304 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3305 for (int i = 0; i < args->nOptions; i++) {
3306 if (i == vm_options_file_pos) {
3307 // insert the new options starting at the same place as the
3308 // -XX:VMOptionsFile option
3309 for (int j = 0; j < args_to_insert->nOptions; j++) {
3310 options.push(args_to_insert->options[j]);
3311 }
3312 } else {
3313 options.push(args->options[i]);
3314 }
3315 }
3316 // make into options array
3317 return set_args(&options);
3318 }
3319 };
3320
3321 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3322 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3323 }
3324
3325 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3326 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3327 }
3328
3329 jint Arguments::parse_options_environment_variable(const char* name,
3330 ScopedVMInitArgs* vm_args) {
3331 char *buffer = ::getenv(name);
3332
3333 // Don't check this environment variable if user has special privileges
3334 // (e.g. unix su command).
3335 if (buffer == NULL || os::have_special_privileges()) {
3336 return JNI_OK;
3337 }
3338
3339 if ((buffer = os::strdup(buffer)) == NULL) {
3340 return JNI_ENOMEM;
3341 }
3342
3343 jio_fprintf(defaultStream::error_stream(),
3344 "Picked up %s: %s\n", name, buffer);
3345
3346 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3347
3348 os::free(buffer);
3349 return retcode;
3350 }
3351
3352 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3353 // read file into buffer
3354 int fd = ::open(file_name, O_RDONLY);
3355 if (fd < 0) {
3356 jio_fprintf(defaultStream::error_stream(),
3357 "Could not open options file '%s'\n",
3358 file_name);
3359 return JNI_ERR;
3360 }
3361
3362 struct stat stbuf;
3363 int retcode = os::stat(file_name, &stbuf);
3364 if (retcode != 0) {
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Could not stat options file '%s'\n",
3367 file_name);
3368 ::close(fd);
3369 return JNI_ERR;
3370 }
3371
3372 if (stbuf.st_size == 0) {
3373 // tell caller there is no option data and that is ok
3374 ::close(fd);
3375 return JNI_OK;
3376 }
3377
3378 // '+ 1' for NULL termination even with max bytes
3379 size_t bytes_alloc = stbuf.st_size + 1;
3380
3381 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3382 if (NULL == buf) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Could not allocate read buffer for options file parse\n");
3385 ::close(fd);
3386 return JNI_ENOMEM;
3387 }
3388
3389 memset(buf, 0, bytes_alloc);
3390
3391 // Fill buffer
3392 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3393 ::close(fd);
3394 if (bytes_read < 0) {
3395 FREE_C_HEAP_ARRAY(char, buf);
3396 jio_fprintf(defaultStream::error_stream(),
3397 "Could not read options file '%s'\n", file_name);
3398 return JNI_ERR;
3399 }
3400
3401 if (bytes_read == 0) {
3402 // tell caller there is no option data and that is ok
3403 FREE_C_HEAP_ARRAY(char, buf);
3404 return JNI_OK;
3405 }
3406
3407 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3408
3409 FREE_C_HEAP_ARRAY(char, buf);
3410 return retcode;
3411 }
3412
3413 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3414 // Construct option array
3415 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3416
3417 // some pointers to help with parsing
3418 char *buffer_end = buffer + buf_len;
3419 char *opt_hd = buffer;
3420 char *wrt = buffer;
3421 char *rd = buffer;
3422
3423 // parse all options
3424 while (rd < buffer_end) {
3425 // skip leading white space from the input string
3426 while (rd < buffer_end && isspace(*rd)) {
3427 rd++;
3428 }
3429
3430 if (rd >= buffer_end) {
3431 break;
3432 }
3433
3434 // Remember this is where we found the head of the token.
3435 opt_hd = wrt;
3436
3437 // Tokens are strings of non white space characters separated
3438 // by one or more white spaces.
3439 while (rd < buffer_end && !isspace(*rd)) {
3440 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3441 int quote = *rd; // matching quote to look for
3442 rd++; // don't copy open quote
3443 while (rd < buffer_end && *rd != quote) {
3444 // include everything (even spaces)
3445 // up until the close quote
3446 *wrt++ = *rd++; // copy to option string
3447 }
3448
3449 if (rd < buffer_end) {
3450 rd++; // don't copy close quote
3451 } else {
3452 // did not see closing quote
3453 jio_fprintf(defaultStream::error_stream(),
3454 "Unmatched quote in %s\n", name);
3455 return JNI_ERR;
3456 }
3457 } else {
3458 *wrt++ = *rd++; // copy to option string
3459 }
3460 }
3461
3462 // steal a white space character and set it to NULL
3463 *wrt++ = '\0';
3464 // We now have a complete token
3465
3466 JavaVMOption option;
3467 option.optionString = opt_hd;
3468 option.extraInfo = NULL;
3469
3470 options.append(option); // Fill in option
3471
3472 rd++; // Advance to next character
3473 }
3474
3475 // Fill out JavaVMInitArgs structure.
3476 return vm_args->set_args(&options);
3477 }
3478
3479 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3480 if (DumpSharedSpaces) {
3481 if (RequireSharedSpaces) {
3482 warning("Cannot dump shared archive while using shared archive");
3483 }
3484 UseSharedSpaces = false;
3485 }
3486 #if INCLUDE_CDS
3487 // Initialize shared archive paths which could include both base and dynamic archive paths
3488 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3489 //
3490 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3491 if (DumpSharedSpaces || UseSharedSpaces) {
3492 init_shared_archive_paths();
3493 }
3494 #endif // INCLUDE_CDS
3495 }
3496
3497 #if INCLUDE_CDS
3498 // Sharing support
3499 // Construct the path to the archive
3500 char* Arguments::get_default_shared_archive_path() {
3501 char *default_archive_path;
3502 char jvm_path[JVM_MAXPATHLEN];
3503 os::jvm_path(jvm_path, sizeof(jvm_path));
3504 char *end = strrchr(jvm_path, *os::file_separator());
3505 if (end != NULL) *end = '\0';
3506 size_t jvm_path_len = strlen(jvm_path);
3507 size_t file_sep_len = strlen(os::file_separator());
3508 const size_t len = jvm_path_len + file_sep_len + 20;
3509 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3510 jio_snprintf(default_archive_path, len,
3511 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3512 jvm_path, os::file_separator());
3513 return default_archive_path;
3514 }
3515
3516 int Arguments::num_archives(const char* archive_path) {
3517 if (archive_path == NULL) {
3518 return 0;
3519 }
3520 int npaths = 1;
3521 char* p = (char*)archive_path;
3522 while (*p != '\0') {
3523 if (*p == os::path_separator()[0]) {
3524 npaths++;
3525 }
3526 p++;
3527 }
3528 return npaths;
3529 }
3530
3531 void Arguments::extract_shared_archive_paths(const char* archive_path,
3532 char** base_archive_path,
3533 char** top_archive_path) {
3534 char* begin_ptr = (char*)archive_path;
3535 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3536 if (end_ptr == NULL || end_ptr == begin_ptr) {
3537 vm_exit_during_initialization("Base archive was not specified", archive_path);
3538 }
3539 size_t len = end_ptr - begin_ptr;
3540 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3541 strncpy(cur_path, begin_ptr, len);
3542 cur_path[len] = '\0';
3543 *base_archive_path = cur_path;
3544
3545 begin_ptr = ++end_ptr;
3546 if (*begin_ptr == '\0') {
3547 vm_exit_during_initialization("Top archive was not specified", archive_path);
3548 }
3549 end_ptr = strchr(begin_ptr, '\0');
3550 assert(end_ptr != NULL, "sanity");
3551 len = end_ptr - begin_ptr;
3552 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3553 strncpy(cur_path, begin_ptr, len + 1);
3554 *top_archive_path = cur_path;
3555 }
3556
3557 void Arguments::init_shared_archive_paths() {
3558 if (ArchiveClassesAtExit != nullptr) {
3559 assert(!RecordDynamicDumpInfo, "already checked");
3560 if (DumpSharedSpaces) {
3561 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3562 }
3563 check_unsupported_dumping_properties();
3564
3565 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3566 vm_exit_during_initialization(
3567 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3568 }
3569 }
3570
3571 if (SharedArchiveFile == nullptr) {
3572 SharedArchivePath = get_default_shared_archive_path();
3573 } else {
3574 int archives = num_archives(SharedArchiveFile);
3575 assert(archives > 0, "must be");
3576
3577 if (is_dumping_archive() && archives > 1) {
3578 vm_exit_during_initialization(
3579 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3580 }
3581
3582 if (DumpSharedSpaces) {
3583 assert(archives == 1, "must be");
3584 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3585 // will be overwritten no matter regardless of its contents
3586 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3587 } else {
3588 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3589 // is read from top.jsa
3590 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3591 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3592 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3593 //
3594 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3595 // allow cases (b) and (c). Case (b) is already checked above.
3596
3597 if (archives > 2) {
3598 vm_exit_during_initialization(
3599 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3600 }
3601 if (archives == 1) {
3602 char* base_archive_path = NULL;
3603 bool success =
3604 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3605 if (!success) {
3606 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3607 // regenerate the dynamic archive base on default archive.
3608 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3609 DynamicDumpSharedSpaces = true;
3610 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3611 SharedArchivePath = get_default_shared_archive_path();
3612 SharedArchiveFile = nullptr;
3613 } else {
3614 if (AutoCreateSharedArchive) {
3615 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3616 AutoCreateSharedArchive = false;
3617 }
3618 no_shared_spaces("invalid archive");
3619 }
3620 } else if (base_archive_path == NULL) {
3621 // User has specified a single archive, which is a static archive.
3622 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3623 } else {
3624 // User has specified a single archive, which is a dynamic archive.
3625 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3626 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3627 }
3628 } else {
3629 extract_shared_archive_paths((const char*)SharedArchiveFile,
3630 &SharedArchivePath, &SharedDynamicArchivePath);
3631 if (SharedArchivePath == NULL) {
3632 assert(SharedDynamicArchivePath == NULL, "must be");
3633 no_shared_spaces("invalid archive");
3634 }
3635 }
3636
3637 if (SharedDynamicArchivePath != nullptr) {
3638 // Check for case (c)
3639 if (RecordDynamicDumpInfo) {
3640 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3641 SharedArchiveFile);
3642 }
3643 if (ArchiveClassesAtExit != nullptr) {
3644 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3645 SharedArchiveFile);
3646 }
3647 }
3648
3649 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3650 vm_exit_during_initialization(
3651 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3652 SharedArchiveFile);
3653 }
3654 }
3655 }
3656 }
3657 #endif // INCLUDE_CDS
3658
3659 #ifndef PRODUCT
3660 // Determine whether LogVMOutput should be implicitly turned on.
3661 static bool use_vm_log() {
3662 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3663 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3664 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3665 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3666 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3667 return true;
3668 }
3669
3670 #ifdef COMPILER1
3671 if (PrintC1Statistics) {
3672 return true;
3673 }
3674 #endif // COMPILER1
3675
3676 #ifdef COMPILER2
3677 if (PrintOptoAssembly || PrintOptoStatistics) {
3678 return true;
3679 }
3680 #endif // COMPILER2
3681
3682 return false;
3683 }
3684
3685 #endif // PRODUCT
3686
3687 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3688 for (int index = 0; index < args->nOptions; index++) {
3689 const JavaVMOption* option = args->options + index;
3690 const char* tail;
3691 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3692 return true;
3693 }
3694 }
3695 return false;
3696 }
3697
3698 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3699 const char* vm_options_file,
3700 const int vm_options_file_pos,
3701 ScopedVMInitArgs* vm_options_file_args,
3702 ScopedVMInitArgs* args_out) {
3703 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3704 if (code != JNI_OK) {
3705 return code;
3706 }
3707
3708 if (vm_options_file_args->get()->nOptions < 1) {
3709 return JNI_OK;
3710 }
3711
3712 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3713 jio_fprintf(defaultStream::error_stream(),
3714 "A VM options file may not refer to a VM options file. "
3715 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3716 "options file '%s' in options container '%s' is an error.\n",
3717 vm_options_file_args->vm_options_file_arg(),
3718 vm_options_file_args->container_name());
3719 return JNI_EINVAL;
3720 }
3721
3722 return args_out->insert(args, vm_options_file_args->get(),
3723 vm_options_file_pos);
3724 }
3725
3726 // Expand -XX:VMOptionsFile found in args_in as needed.
3727 // mod_args and args_out parameters may return values as needed.
3728 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3729 ScopedVMInitArgs* mod_args,
3730 JavaVMInitArgs** args_out) {
3731 jint code = match_special_option_and_act(args_in, mod_args);
3732 if (code != JNI_OK) {
3733 return code;
3734 }
3735
3736 if (mod_args->is_set()) {
3737 // args_in contains -XX:VMOptionsFile and mod_args contains the
3738 // original options from args_in along with the options expanded
3739 // from the VMOptionsFile. Return a short-hand to the caller.
3740 *args_out = mod_args->get();
3741 } else {
3742 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3743 }
3744 return JNI_OK;
3745 }
3746
3747 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3748 ScopedVMInitArgs* args_out) {
3749 // Remaining part of option string
3750 const char* tail;
3751 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3752
3753 for (int index = 0; index < args->nOptions; index++) {
3754 const JavaVMOption* option = args->options + index;
3755 if (match_option(option, "-XX:Flags=", &tail)) {
3756 Arguments::set_jvm_flags_file(tail);
3757 continue;
3758 }
3759 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3760 if (vm_options_file_args.found_vm_options_file_arg()) {
3761 jio_fprintf(defaultStream::error_stream(),
3762 "The option '%s' is already specified in the options "
3763 "container '%s' so the specification of '%s' in the "
3764 "same options container is an error.\n",
3765 vm_options_file_args.vm_options_file_arg(),
3766 vm_options_file_args.container_name(),
3767 option->optionString);
3768 return JNI_EINVAL;
3769 }
3770 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3771 // If there's a VMOptionsFile, parse that
3772 jint code = insert_vm_options_file(args, tail, index,
3773 &vm_options_file_args, args_out);
3774 if (code != JNI_OK) {
3775 return code;
3776 }
3777 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3778 if (args_out->is_set()) {
3779 // The VMOptions file inserted some options so switch 'args'
3780 // to the new set of options, and continue processing which
3781 // preserves "last option wins" semantics.
3782 args = args_out->get();
3783 // The first option from the VMOptionsFile replaces the
3784 // current option. So we back track to process the
3785 // replacement option.
3786 index--;
3787 }
3788 continue;
3789 }
3790 if (match_option(option, "-XX:+PrintVMOptions")) {
3791 PrintVMOptions = true;
3792 continue;
3793 }
3794 if (match_option(option, "-XX:-PrintVMOptions")) {
3795 PrintVMOptions = false;
3796 continue;
3797 }
3798 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3799 IgnoreUnrecognizedVMOptions = true;
3800 continue;
3801 }
3802 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3803 IgnoreUnrecognizedVMOptions = false;
3804 continue;
3805 }
3806 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3807 JVMFlag::printFlags(tty, false);
3808 vm_exit(0);
3809 }
3810
3811 #ifndef PRODUCT
3812 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3813 JVMFlag::printFlags(tty, true);
3814 vm_exit(0);
3815 }
3816 #endif
3817 }
3818 return JNI_OK;
3819 }
3820
3821 static void print_options(const JavaVMInitArgs *args) {
3822 const char* tail;
3823 for (int index = 0; index < args->nOptions; index++) {
3824 const JavaVMOption *option = args->options + index;
3825 if (match_option(option, "-XX:", &tail)) {
3826 logOption(tail);
3827 }
3828 }
3829 }
3830
3831 bool Arguments::handle_deprecated_print_gc_flags() {
3832 if (PrintGC) {
3833 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3834 }
3835 if (PrintGCDetails) {
3836 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3837 }
3838
3839 if (_legacyGCLogging.lastFlag == 2) {
3840 // -Xloggc was used to specify a filename
3841 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3842
3843 LogTarget(Error, logging) target;
3844 LogStream errstream(target);
3845 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3846 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3847 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3848 }
3849 return true;
3850 }
3851
3852 static void apply_debugger_ergo() {
3853 #ifndef PRODUCT
3854 // UseDebuggerErgo is notproduct
3855 if (ReplayCompiles) {
3856 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3857 }
3858 #endif
3859
3860 #ifndef PRODUCT
3861 if (UseDebuggerErgo) {
3862 // Turn on sub-flags
3863 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3864 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3865 }
3866 #endif
3867
3868 if (UseDebuggerErgo2) {
3869 // Debugging with limited number of CPUs
3870 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3871 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3872 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3873 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3874 }
3875 }
3876
3877 // Parse entry point called from JNI_CreateJavaVM
3878
3879 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3880 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3881 JVMFlag::check_all_flag_declarations();
3882
3883 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3884 const char* hotspotrc = ".hotspotrc";
3885 bool settings_file_specified = false;
3886 bool needs_hotspotrc_warning = false;
3887 ScopedVMInitArgs initial_vm_options_args("");
3888 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3889 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3890
3891 // Pointers to current working set of containers
3892 JavaVMInitArgs* cur_cmd_args;
3893 JavaVMInitArgs* cur_vm_options_args;
3894 JavaVMInitArgs* cur_java_options_args;
3895 JavaVMInitArgs* cur_java_tool_options_args;
3896
3897 // Containers for modified/expanded options
3898 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3899 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3900 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3901 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3902
3903
3904 jint code =
3905 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3906 if (code != JNI_OK) {
3907 return code;
3908 }
3909
3910 code = parse_java_options_environment_variable(&initial_java_options_args);
3911 if (code != JNI_OK) {
3912 return code;
3913 }
3914
3915 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3916 char *vmoptions = ClassLoader::lookup_vm_options();
3917 if (vmoptions != NULL) {
3918 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3919 FREE_C_HEAP_ARRAY(char, vmoptions);
3920 if (code != JNI_OK) {
3921 return code;
3922 }
3923 }
3924
3925 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3926 &mod_java_tool_options_args,
3927 &cur_java_tool_options_args);
3928 if (code != JNI_OK) {
3929 return code;
3930 }
3931
3932 code = expand_vm_options_as_needed(initial_cmd_args,
3933 &mod_cmd_args,
3934 &cur_cmd_args);
3935 if (code != JNI_OK) {
3936 return code;
3937 }
3938
3939 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3940 &mod_java_options_args,
3941 &cur_java_options_args);
3942 if (code != JNI_OK) {
3943 return code;
3944 }
3945
3946 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3947 &mod_vm_options_args,
3948 &cur_vm_options_args);
3949 if (code != JNI_OK) {
3950 return code;
3951 }
3952
3953 const char* flags_file = Arguments::get_jvm_flags_file();
3954 settings_file_specified = (flags_file != NULL);
3955
3956 if (IgnoreUnrecognizedVMOptions) {
3957 cur_cmd_args->ignoreUnrecognized = true;
3958 cur_java_tool_options_args->ignoreUnrecognized = true;
3959 cur_java_options_args->ignoreUnrecognized = true;
3960 }
3961
3962 // Parse specified settings file
3963 if (settings_file_specified) {
3964 if (!process_settings_file(flags_file, true,
3965 cur_cmd_args->ignoreUnrecognized)) {
3966 return JNI_EINVAL;
3967 }
3968 } else {
3969 #ifdef ASSERT
3970 // Parse default .hotspotrc settings file
3971 if (!process_settings_file(".hotspotrc", false,
3972 cur_cmd_args->ignoreUnrecognized)) {
3973 return JNI_EINVAL;
3974 }
3975 #else
3976 struct stat buf;
3977 if (os::stat(hotspotrc, &buf) == 0) {
3978 needs_hotspotrc_warning = true;
3979 }
3980 #endif
3981 }
3982
3983 if (PrintVMOptions) {
3984 print_options(cur_java_tool_options_args);
3985 print_options(cur_cmd_args);
3986 print_options(cur_java_options_args);
3987 }
3988
3989 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3990 jint result = parse_vm_init_args(cur_vm_options_args,
3991 cur_java_tool_options_args,
3992 cur_java_options_args,
3993 cur_cmd_args);
3994
3995 if (result != JNI_OK) {
3996 return result;
3997 }
3998
3999 // Delay warning until here so that we've had a chance to process
4000 // the -XX:-PrintWarnings flag
4001 if (needs_hotspotrc_warning) {
4002 warning("%s file is present but has been ignored. "
4003 "Run with -XX:Flags=%s to load the file.",
4004 hotspotrc, hotspotrc);
4005 }
4006
4007 if (needs_module_property_warning) {
4008 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4009 " names that are reserved for internal use.");
4010 }
4011
4012 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4013 UNSUPPORTED_OPTION(UseLargePages);
4014 #endif
4015
4016 #if defined(AIX)
4017 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4018 #endif
4019
4020 #ifndef PRODUCT
4021 if (TraceBytecodesAt != 0) {
4022 TraceBytecodes = true;
4023 }
4024 if (CountCompiledCalls) {
4025 if (UseCounterDecay) {
4026 warning("UseCounterDecay disabled because CountCalls is set");
4027 UseCounterDecay = false;
4028 }
4029 }
4030 #endif // PRODUCT
4031
4032 if (ScavengeRootsInCode == 0) {
4033 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4034 warning("Forcing ScavengeRootsInCode non-zero");
4035 }
4036 ScavengeRootsInCode = 1;
4037 }
4038
4039 if (!handle_deprecated_print_gc_flags()) {
4040 return JNI_EINVAL;
4041 }
4042
4043 // Set object alignment values.
4044 set_object_alignment();
4045
4046 #if !INCLUDE_CDS
4047 if (DumpSharedSpaces || RequireSharedSpaces) {
4048 jio_fprintf(defaultStream::error_stream(),
4049 "Shared spaces are not supported in this VM\n");
4050 return JNI_ERR;
4051 }
4052 if (DumpLoadedClassList != NULL) {
4053 jio_fprintf(defaultStream::error_stream(),
4054 "DumpLoadedClassList is not supported in this VM\n");
4055 return JNI_ERR;
4056 }
4057 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
4058 log_is_enabled(Info, cds)) {
4059 warning("Shared spaces are not supported in this VM");
4060 UseSharedSpaces = false;
4061 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4062 }
4063 no_shared_spaces("CDS Disabled");
4064 #endif // INCLUDE_CDS
4065
4066 // Verify NMT arguments
4067 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
4068 if (lvl == NMT_unknown) {
4069 jio_fprintf(defaultStream::error_stream(),
4070 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4071 return JNI_ERR;
4072 }
4073 if (PrintNMTStatistics && lvl == NMT_off) {
4074 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
4075 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
4076 }
4077
4078 if (TraceDependencies && VerifyDependencies) {
4079 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
4080 warning("TraceDependencies results may be inflated by VerifyDependencies");
4081 }
4082 }
4083
4084 apply_debugger_ergo();
4085
4086 if (log_is_enabled(Info, arguments)) {
4087 LogStream st(Log(arguments)::info());
4088 Arguments::print_on(&st);
4089 }
4090
4091 return JNI_OK;
4092 }
4093
4094 jint Arguments::apply_ergo() {
4095 // Set flags based on ergonomics.
4096 jint result = set_ergonomics_flags();
4097 if (result != JNI_OK) return result;
4098
4099 // Set heap size based on available physical memory
4100 set_heap_size();
4101
4102 GCConfig::arguments()->initialize();
4103
4104 set_shared_spaces_flags_and_archive_paths();
4105
4106 // Initialize Metaspace flags and alignments
4107 Metaspace::ergo_initialize();
4108
4109 if (!StringDedup::ergo_initialize()) {
4110 return JNI_EINVAL;
4111 }
4112
4113 // Set compiler flags after GC is selected and GC specific
4114 // flags (LoopStripMiningIter) are set.
4115 CompilerConfig::ergo_initialize();
4116
4117 // Set bytecode rewriting flags
4118 set_bytecode_flags();
4119
4120 // Set flags if aggressive optimization flags are enabled
4121 jint code = set_aggressive_opts_flags();
4122 if (code != JNI_OK) {
4123 return code;
4124 }
4125
4126 #ifdef ZERO
4127 // Clear flags not supported on zero.
4128 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4129 #endif // ZERO
4130
4131 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4132 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4133 DebugNonSafepoints = true;
4134 }
4135
4136 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4137 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4138 }
4139
4140 // Treat the odd case where local verification is enabled but remote
4141 // verification is not as if both were enabled.
4142 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4143 log_info(verification)("Turning on remote verification because local verification is on");
4144 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4145 }
4146 if (!EnableValhalla || (is_interpreter_only() && !is_dumping_archive() && !UseSharedSpaces)) {
4147 // Disable calling convention optimizations if inline types are not supported.
4148 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
4149 // the CDS archive, as the values must match between dumptime and runtime.
4150 InlineTypePassFieldsAsArgs = false;
4151 InlineTypeReturnedAsFields = false;
4152 }
4153
4154 #ifndef PRODUCT
4155 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4156 if (use_vm_log()) {
4157 LogVMOutput = true;
4158 }
4159 }
4160 #endif // PRODUCT
4161
4162 if (PrintCommandLineFlags) {
4163 JVMFlag::printSetFlags(tty);
4164 }
4165
4166 #ifdef COMPILER2
4167 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4168 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4169 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4170 }
4171 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4172
4173 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4174 if (!EnableVectorReboxing) {
4175 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4176 } else {
4177 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4178 }
4179 }
4180 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4181
4182 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4183 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4184 }
4185 FLAG_SET_DEFAULT(UseVectorStubs, false);
4186 }
4187 #endif // COMPILER2
4188
4189 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4190 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4191 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4192 }
4193 }
4194 return JNI_OK;
4195 }
4196
4197 jint Arguments::adjust_after_os() {
4198 if (UseNUMA) {
4199 if (UseParallelGC) {
4200 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4201 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4202 }
4203 }
4204 }
4205 return JNI_OK;
4206 }
4207
4208 int Arguments::PropertyList_count(SystemProperty* pl) {
4209 int count = 0;
4210 while(pl != NULL) {
4211 count++;
4212 pl = pl->next();
4213 }
4214 return count;
4215 }
4216
4217 // Return the number of readable properties.
4218 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4219 int count = 0;
4220 while(pl != NULL) {
4221 if (pl->readable()) {
4222 count++;
4223 }
4224 pl = pl->next();
4225 }
4226 return count;
4227 }
4228
4229 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4230 assert(key != NULL, "just checking");
4231 SystemProperty* prop;
4232 for (prop = pl; prop != NULL; prop = prop->next()) {
4233 if (strcmp(key, prop->key()) == 0) return prop->value();
4234 }
4235 return NULL;
4236 }
4237
4238 // Return the value of the requested property provided that it is a readable property.
4239 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4240 assert(key != NULL, "just checking");
4241 SystemProperty* prop;
4242 // Return the property value if the keys match and the property is not internal or
4243 // it's the special internal property "jdk.boot.class.path.append".
4244 for (prop = pl; prop != NULL; prop = prop->next()) {
4245 if (strcmp(key, prop->key()) == 0) {
4246 if (!prop->internal()) {
4247 return prop->value();
4248 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4249 return prop->value();
4250 } else {
4251 // Property is internal and not jdk.boot.class.path.append so return NULL.
4252 return NULL;
4253 }
4254 }
4255 }
4256 return NULL;
4257 }
4258
4259 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4260 SystemProperty* p = *plist;
4261 if (p == NULL) {
4262 *plist = new_p;
4263 } else {
4264 while (p->next() != NULL) {
4265 p = p->next();
4266 }
4267 p->set_next(new_p);
4268 }
4269 }
4270
4271 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4272 bool writeable, bool internal) {
4273 if (plist == NULL)
4274 return;
4275
4276 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4277 PropertyList_add(plist, new_p);
4278 }
4279
4280 void Arguments::PropertyList_add(SystemProperty *element) {
4281 PropertyList_add(&_system_properties, element);
4282 }
4283
4284 // This add maintains unique property key in the list.
4285 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4286 PropertyAppendable append, PropertyWriteable writeable,
4287 PropertyInternal internal) {
4288 if (plist == NULL)
4289 return;
4290
4291 // If property key exists and is writeable, then update with new value.
4292 // Trying to update a non-writeable property is silently ignored.
4293 SystemProperty* prop;
4294 for (prop = *plist; prop != NULL; prop = prop->next()) {
4295 if (strcmp(k, prop->key()) == 0) {
4296 if (append == AppendProperty) {
4297 prop->append_writeable_value(v);
4298 } else {
4299 prop->set_writeable_value(v);
4300 }
4301 return;
4302 }
4303 }
4304
4305 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4306 }
4307
4308 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4309 // Returns true if all of the source pointed by src has been copied over to
4310 // the destination buffer pointed by buf. Otherwise, returns false.
4311 // Notes:
4312 // 1. If the length (buflen) of the destination buffer excluding the
4313 // NULL terminator character is not long enough for holding the expanded
4314 // pid characters, it also returns false instead of returning the partially
4315 // expanded one.
4316 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4317 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4318 char* buf, size_t buflen) {
4319 const char* p = src;
4320 char* b = buf;
4321 const char* src_end = &src[srclen];
4322 char* buf_end = &buf[buflen - 1];
4323
4324 while (p < src_end && b < buf_end) {
4325 if (*p == '%') {
4326 switch (*(++p)) {
4327 case '%': // "%%" ==> "%"
4328 *b++ = *p++;
4329 break;
4330 case 'p': { // "%p" ==> current process id
4331 // buf_end points to the character before the last character so
4332 // that we could write '\0' to the end of the buffer.
4333 size_t buf_sz = buf_end - b + 1;
4334 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4335
4336 // if jio_snprintf fails or the buffer is not long enough to hold
4337 // the expanded pid, returns false.
4338 if (ret < 0 || ret >= (int)buf_sz) {
4339 return false;
4340 } else {
4341 b += ret;
4342 assert(*b == '\0', "fail in copy_expand_pid");
4343 if (p == src_end && b == buf_end + 1) {
4344 // reach the end of the buffer.
4345 return true;
4346 }
4347 }
4348 p++;
4349 break;
4350 }
4351 default :
4352 *b++ = '%';
4353 }
4354 } else {
4355 *b++ = *p++;
4356 }
4357 }
4358 *b = '\0';
4359 return (p == src_end); // return false if not all of the source was copied
4360 }
4361
4362 bool Arguments::parse_malloc_limit_size(const char* s, size_t* out) {
4363 julong limit = 0;
4364 Arguments::ArgsRange range = parse_memory_size(s, &limit, 1, SIZE_MAX);
4365 switch (range) {
4366 case ArgsRange::arg_in_range:
4367 *out = (size_t)limit;
4368 return true;
4369 case ArgsRange::arg_too_big: // only possible on 32-bit
4370 vm_exit_during_initialization("MallocLimit: too large", s);
4371 break;
4372 case ArgsRange::arg_too_small:
4373 vm_exit_during_initialization("MallocLimit: limit must be > 0");
4374 break;
4375 default:
4376 break;
4377 }
4378 return false;
4379 }
4380
4381 // Helper for parse_malloc_limits
4382 void Arguments::parse_single_category_limit(char* expression, size_t limits[mt_number_of_types]) {
4383 // <category>:<limit>
4384 char* colon = ::strchr(expression, ':');
4385 if (colon == nullptr) {
4386 vm_exit_during_initialization("MallocLimit: colon missing", expression);
4387 }
4388 *colon = '\0';
4389 MEMFLAGS f = NMTUtil::string_to_flag(expression);
4390 if (f == mtNone) {
4391 vm_exit_during_initialization("MallocLimit: invalid nmt category", expression);
4392 }
4393 if (parse_malloc_limit_size(colon + 1, limits + (int)f) == false) {
4394 vm_exit_during_initialization("Invalid MallocLimit size", colon + 1);
4395 }
4396 }
4397
4398 void Arguments::parse_malloc_limits(size_t* total_limit, size_t limits[mt_number_of_types]) {
4399
4400 // Reset output to 0
4401 *total_limit = 0;
4402 for (int i = 0; i < mt_number_of_types; i ++) {
4403 limits[i] = 0;
4404 }
4405
4406 // We are done if the option is not given.
4407 if (MallocLimit == nullptr) {
4408 return;
4409 }
4410
4411 // Global form?
4412 if (parse_malloc_limit_size(MallocLimit, total_limit)) {
4413 return;
4414 }
4415
4416 // No. So it must be in category-specific form: MallocLimit=<nmt category>:<size>[,<nmt category>:<size> ..]
4417 char* copy = os::strdup(MallocLimit);
4418 if (copy == nullptr) {
4419 vm_exit_out_of_memory(strlen(MallocLimit), OOM_MALLOC_ERROR, "MallocLimit");
4420 }
4421
4422 char* p = copy, *q;
4423 do {
4424 q = p;
4425 p = ::strchr(q, ',');
4426 if (p != nullptr) {
4427 *p = '\0';
4428 p ++;
4429 }
4430 parse_single_category_limit(q, limits);
4431 } while (p != nullptr);
4432
4433 os::free(copy);
4434
4435 }