1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "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
73 #define DEFAULT_JAVA_LAUNCHER "generic"
74
75 char* Arguments::_jvm_flags_file = NULL;
76 char** Arguments::_jvm_flags_array = NULL;
77 int Arguments::_num_jvm_flags = 0;
78 char** Arguments::_jvm_args_array = NULL;
79 int Arguments::_num_jvm_args = 0;
80 char* Arguments::_java_command = NULL;
81 SystemProperty* Arguments::_system_properties = NULL;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = NULL;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
96
97 bool Arguments::_enable_preview = false;
98
99 char* Arguments::SharedArchivePath = NULL;
100 char* Arguments::SharedDynamicArchivePath = NULL;
101
102 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
103
104 AgentLibraryList Arguments::_libraryList;
105 AgentLibraryList Arguments::_agentList;
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = NULL;
111 exit_hook_t Arguments::_exit_hook = NULL;
112 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = NULL;
116 SystemProperty *Arguments::_java_library_path = NULL;
117 SystemProperty *Arguments::_java_home = NULL;
118 SystemProperty *Arguments::_java_class_path = NULL;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
120 SystemProperty *Arguments::_vm_info = NULL;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
123 PathString *Arguments::_boot_class_path = NULL;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = NULL;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
132 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
133 if (new_value == NULL) {
134 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
135 return false;
136 }
137 if (_value != NULL) {
138 FreeHeap(_value);
139 }
140 _value = new_value;
141 strcpy(_value, value);
142 return true;
143 }
144
145 void PathString::append_value(const char *value) {
146 char *sp;
147 size_t len = 0;
148 if (value != NULL) {
149 len = strlen(value);
150 if (_value != NULL) {
151 len += strlen(_value);
152 }
153 sp = AllocateHeap(len+2, mtArguments);
154 assert(sp != NULL, "Unable to allocate space for new append path value");
155 if (sp != NULL) {
156 if (_value != NULL) {
157 strcpy(sp, _value);
158 strcat(sp, os::path_separator());
159 strcat(sp, value);
160 FreeHeap(_value);
161 } else {
162 strcpy(sp, value);
163 }
164 _value = sp;
165 }
166 }
167 }
168
169 PathString::PathString(const char* value) {
170 if (value == NULL) {
171 _value = NULL;
172 } else {
173 _value = AllocateHeap(strlen(value)+1, mtArguments);
174 strcpy(_value, value);
175 }
176 }
177
178 PathString::~PathString() {
179 if (_value != NULL) {
180 FreeHeap(_value);
181 _value = NULL;
182 }
183 }
184
185 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
186 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
187 size_t len = strlen(module_name) + 1;
188 _module_name = AllocateHeap(len, mtInternal);
189 strncpy(_module_name, module_name, len); // copy the trailing null
190 _path = new PathString(path);
191 }
192
193 ModulePatchPath::~ModulePatchPath() {
194 if (_module_name != NULL) {
195 FreeHeap(_module_name);
196 _module_name = NULL;
197 }
198 if (_path != NULL) {
199 delete _path;
200 _path = NULL;
201 }
202 }
203
204 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
205 if (key == NULL) {
206 _key = NULL;
207 } else {
208 _key = AllocateHeap(strlen(key)+1, mtArguments);
209 strcpy(_key, key);
210 }
211 _next = NULL;
212 _internal = internal;
213 _writeable = writeable;
214 }
215
216 AgentLibrary::AgentLibrary(const char* name, const char* options,
217 bool is_absolute_path, void* os_lib,
218 bool instrument_lib) {
219 _name = AllocateHeap(strlen(name)+1, mtArguments);
220 strcpy(_name, name);
221 if (options == NULL) {
222 _options = NULL;
223 } else {
224 _options = AllocateHeap(strlen(options)+1, mtArguments);
225 strcpy(_options, options);
226 }
227 _is_absolute_path = is_absolute_path;
228 _os_lib = os_lib;
229 _next = NULL;
230 _state = agent_invalid;
231 _is_static_lib = false;
232 _is_instrument_lib = instrument_lib;
233 }
234
235 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
236 // part of the option string.
237 static bool match_option(const JavaVMOption *option, const char* name,
238 const char** tail) {
239 size_t len = strlen(name);
240 if (strncmp(option->optionString, name, len) == 0) {
241 *tail = option->optionString + len;
242 return true;
243 } else {
244 return false;
245 }
246 }
247
248 // Check if 'option' matches 'name'. No "tail" is allowed.
249 static bool match_option(const JavaVMOption *option, const char* name) {
250 const char* tail = NULL;
251 bool result = match_option(option, name, &tail);
252 if (tail != NULL && *tail == '\0') {
253 return result;
254 } else {
255 return false;
256 }
257 }
258
259 // Return true if any of the strings in null-terminated array 'names' matches.
260 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
261 // the option must match exactly.
262 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
263 bool tail_allowed) {
264 for (/* empty */; *names != NULL; ++names) {
265 if (match_option(option, *names, tail)) {
266 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
267 return true;
268 }
269 }
270 }
271 return false;
272 }
273
274 #if INCLUDE_JFR
275 static bool _has_jfr_option = false; // is using JFR
276
277 // return true on failure
278 static bool match_jfr_option(const JavaVMOption** option) {
279 assert((*option)->optionString != NULL, "invariant");
280 char* tail = NULL;
281 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
282 _has_jfr_option = true;
283 return Jfr::on_start_flight_recording_option(option, tail);
284 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
285 _has_jfr_option = true;
286 return Jfr::on_flight_recorder_option(option, tail);
287 }
288 return false;
289 }
290
291 bool Arguments::has_jfr_option() {
292 return _has_jfr_option;
293 }
294 #endif
295
296 static void logOption(const char* opt) {
297 if (PrintVMOptions) {
298 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
299 }
300 }
301
302 bool needs_module_property_warning = false;
303
304 #define MODULE_PROPERTY_PREFIX "jdk.module."
305 #define MODULE_PROPERTY_PREFIX_LEN 11
306 #define ADDEXPORTS "addexports"
307 #define ADDEXPORTS_LEN 10
308 #define ADDREADS "addreads"
309 #define ADDREADS_LEN 8
310 #define ADDOPENS "addopens"
311 #define ADDOPENS_LEN 8
312 #define PATCH "patch"
313 #define PATCH_LEN 5
314 #define ADDMODS "addmods"
315 #define ADDMODS_LEN 7
316 #define LIMITMODS "limitmods"
317 #define LIMITMODS_LEN 9
318 #define PATH "path"
319 #define PATH_LEN 4
320 #define UPGRADE_PATH "upgrade.path"
321 #define UPGRADE_PATH_LEN 12
322 #define ENABLE_NATIVE_ACCESS "enable.native.access"
323 #define ENABLE_NATIVE_ACCESS_LEN 20
324
325 void Arguments::add_init_library(const char* name, char* options) {
326 _libraryList.add(new AgentLibrary(name, options, false, NULL));
327 }
328
329 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
330 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
331 }
332
333 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
334 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
335 }
336
337 // Late-binding agents not started via arguments
338 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
339 _agentList.add(agentLib);
340 }
341
342 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
343 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
344 return ((strncmp(option, property, len) == 0) &&
345 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
346 }
347
348 // Return true if property starts with "jdk.module." and its ensuing chars match
349 // any of the reserved module properties.
350 // property should be passed without the leading "-D".
351 bool Arguments::is_internal_module_property(const char* property) {
352 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
353 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
354 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
355 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
356 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
357 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
358 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
359 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
360 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
361 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
362 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
363 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
364 return true;
365 }
366 }
367 return false;
368 }
369
370 // Process java launcher properties.
371 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
372 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
373 // Must do this before setting up other system properties,
374 // as some of them may depend on launcher type.
375 for (int index = 0; index < args->nOptions; index++) {
376 const JavaVMOption* option = args->options + index;
377 const char* tail;
378
379 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
380 process_java_launcher_argument(tail, option->extraInfo);
381 continue;
382 }
383 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
384 if (strcmp(tail, "true") == 0) {
385 _sun_java_launcher_is_altjvm = true;
386 }
387 continue;
388 }
389 }
390 }
391
392 // Initialize system properties key and value.
393 void Arguments::init_system_properties() {
394
395 // Set up _boot_class_path which is not a property but
396 // relies heavily on argument processing and the jdk.boot.class.path.append
397 // property. It is used to store the underlying boot class path.
398 _boot_class_path = new PathString(NULL);
399
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
401 "Java Virtual Machine Specification", false));
402 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
404 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
405
406 // Initialize the vm.info now, but it will need updating after argument parsing.
407 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
408
409 // Following are JVMTI agent writable properties.
410 // Properties values are set to NULL and they are
411 // os specific they are initialized in os::init_system_properties_values().
412 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
413 _java_library_path = new SystemProperty("java.library.path", NULL, true);
414 _java_home = new SystemProperty("java.home", NULL, true);
415 _java_class_path = new SystemProperty("java.class.path", "", true);
416 // jdk.boot.class.path.append is a non-writeable, internal property.
417 // It can only be set by either:
418 // - -Xbootclasspath/a:
419 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
420 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true);
421
422 // Add to System Property list.
423 PropertyList_add(&_system_properties, _sun_boot_library_path);
424 PropertyList_add(&_system_properties, _java_library_path);
425 PropertyList_add(&_system_properties, _java_home);
426 PropertyList_add(&_system_properties, _java_class_path);
427 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
428 PropertyList_add(&_system_properties, _vm_info);
429
430 // Set OS specific system properties values
431 os::init_system_properties_values();
432 }
433
434 // Update/Initialize System properties after JDK version number is known
435 void Arguments::init_version_specific_system_properties() {
436 enum { bufsz = 16 };
437 char buffer[bufsz];
438 const char* spec_vendor = "Oracle Corporation";
439 uint32_t spec_version = JDK_Version::current().major_version();
440
441 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
442
443 PropertyList_add(&_system_properties,
444 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
445 PropertyList_add(&_system_properties,
446 new SystemProperty("java.vm.specification.version", buffer, false));
447 PropertyList_add(&_system_properties,
448 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
449 }
450
451 /*
452 * -XX argument processing:
453 *
454 * -XX arguments are defined in several places, such as:
455 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
456 * -XX arguments are parsed in parse_argument().
457 * -XX argument bounds checking is done in check_vm_args_consistency().
458 *
459 * Over time -XX arguments may change. There are mechanisms to handle common cases:
460 *
461 * ALIASED: An option that is simply another name for another option. This is often
462 * part of the process of deprecating a flag, but not all aliases need
463 * to be deprecated.
464 *
465 * Create an alias for an option by adding the old and new option names to the
466 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
467 *
468 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
469 * support may be removed in the future. Both regular and aliased options may be
470 * deprecated.
471 *
472 * Add a deprecation warning for an option (or alias) by adding an entry in the
473 * "special_jvm_flags" table and setting the "deprecated_in" field.
474 * Often an option "deprecated" in one major release will
475 * be made "obsolete" in the next. In this case the entry should also have its
476 * "obsolete_in" field set.
477 *
478 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
479 * on the command line. A warning is printed to let the user know that option might not
480 * be accepted in the future.
481 *
482 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
483 * table and setting the "obsolete_in" field.
484 *
485 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
486 * to the current JDK version. The system will flatly refuse to admit the existence of
487 * the flag. This allows a flag to die automatically over JDK releases.
488 *
489 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
490 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
491 * - Newly obsolete or expired deprecated options should have their global variable
492 * definitions removed (from globals.hpp, etc) and related implementations removed.
493 *
494 * Recommended approach for removing options:
495 *
496 * To remove options commonly used by customers (e.g. product -XX options), use
497 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
498 *
499 * To remove internal options (e.g. diagnostic, experimental, develop options), use
500 * a 2-step model adding major release numbers to the obsolete and expire columns.
501 *
502 * To change the name of an option, use the alias table as well as a 2-step
503 * model adding major release numbers to the deprecate and expire columns.
504 * Think twice about aliasing commonly used customer options.
505 *
506 * There are times when it is appropriate to leave a future release number as undefined.
507 *
508 * Tests: Aliases should be tested in VMAliasOptions.java.
509 * Deprecated options should be tested in VMDeprecatedOptions.java.
510 */
511
512 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
513 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
514 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
515 // the command-line as usual, but will issue a warning.
516 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
517 // the command-line, while issuing a warning and ignoring the flag value.
518 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
519 // existence of the flag.
520 //
521 // MANUAL CLEANUP ON JDK VERSION UPDATES:
522 // This table ensures that the handling of options will update automatically when the JDK
523 // version is incremented, but the source code needs to be cleanup up manually:
524 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
525 // variable should be removed, as well as users of the variable.
526 // - As "deprecated" options age into "obsolete" options, move the entry into the
527 // "Obsolete Flags" section of the table.
528 // - All expired options should be removed from the table.
529 static SpecialFlag const special_jvm_flags[] = {
530 // -------------- Deprecated Flags --------------
531 // --- Non-alias flags - sorted by obsolete_in then expired_in:
532 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
537 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
539 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
540 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
541 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
542 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) },
543
544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
545 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
546 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
547 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
548
549 // -------------- Obsolete Flags - sorted by expired_in --------------
550
551 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
552 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
553 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
554 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
555 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
556 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
557
558 #ifdef ASSERT
559 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
560 #endif
561
562 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
563 // These entries will generate build errors. Their purpose is to test the macros.
564 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
565 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
566 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
567 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
568 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
569 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
570 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
571 #endif
572
573 { NULL, JDK_Version(0), JDK_Version(0) }
574 };
575
576 // Flags that are aliases for other flags.
577 typedef struct {
578 const char* alias_name;
579 const char* real_name;
580 } AliasedFlag;
581
582 static AliasedFlag const aliased_jvm_flags[] = {
583 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
584 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
585 { NULL, NULL}
586 };
587
588 // Return true if "v" is less than "other", where "other" may be "undefined".
589 static bool version_less_than(JDK_Version v, JDK_Version other) {
590 assert(!v.is_undefined(), "must be defined");
591 if (!other.is_undefined() && v.compare(other) >= 0) {
592 return false;
593 } else {
594 return true;
595 }
596 }
597
598 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
599 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
600 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
601 flag = special_jvm_flags[i];
602 return true;
603 }
604 }
605 return false;
606 }
607
608 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
609 assert(version != NULL, "Must provide a version buffer");
610 SpecialFlag flag;
611 if (lookup_special_flag(flag_name, flag)) {
612 if (!flag.obsolete_in.is_undefined()) {
613 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
614 *version = flag.obsolete_in;
615 // This flag may have been marked for obsoletion in this version, but we may not
616 // have actually removed it yet. Rather than ignoring it as soon as we reach
617 // this version we allow some time for the removal to happen. So if the flag
618 // still actually exists we process it as normal, but issue an adjusted warning.
619 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
620 if (real_flag != NULL) {
621 char version_str[256];
622 version->to_string(version_str, sizeof(version_str));
623 warning("Temporarily processing option %s; support is scheduled for removal in %s",
624 flag_name, version_str);
625 return false;
626 }
627 return true;
628 }
629 }
630 }
631 return false;
632 }
633
634 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
635 assert(version != NULL, "Must provide a version buffer");
636 SpecialFlag flag;
637 if (lookup_special_flag(flag_name, flag)) {
638 if (!flag.deprecated_in.is_undefined()) {
639 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
640 version_less_than(JDK_Version::current(), flag.expired_in)) {
641 *version = flag.deprecated_in;
642 return 1;
643 } else {
644 return -1;
645 }
646 }
647 }
648 return 0;
649 }
650
651 const char* Arguments::real_flag_name(const char *flag_name) {
652 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
653 const AliasedFlag& flag_status = aliased_jvm_flags[i];
654 if (strcmp(flag_status.alias_name, flag_name) == 0) {
655 return flag_status.real_name;
656 }
657 }
658 return flag_name;
659 }
660
661 #ifdef ASSERT
662 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
663 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
664 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
665 return true;
666 }
667 }
668 return false;
669 }
670
671 // Verifies the correctness of the entries in the special_jvm_flags table.
672 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
673 // version being earlier than the deprecation version, then a warning is issued
674 // and verification fails - by returning false. If it is detected that the table
675 // is out of date, with respect to the current version, then ideally a warning is
676 // issued but verification does not fail. This allows the VM to operate when the
677 // version is first updated, without needing to update all the impacted flags at
678 // the same time. In practice we can't issue the warning immediately when the version
679 // is updated as it occurs for every test and some tests are not prepared to handle
680 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
681 // if the check_globals flag is true, and in addition allow a grace period and only
682 // check for stale flags when we hit build 25 (which is far enough into the 6 month
683 // release cycle that all flag updates should have been processed, whilst still
684 // leaving time to make the change before RDP2).
685 // We use a gtest to call this, passing true, so that we can detect stale flags before
686 // the end of the release cycle.
687
688 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
689
690 bool Arguments::verify_special_jvm_flags(bool check_globals) {
691 bool success = true;
692 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
693 const SpecialFlag& flag = special_jvm_flags[i];
694 if (lookup_special_flag(flag.name, i)) {
695 warning("Duplicate special flag declaration \"%s\"", flag.name);
696 success = false;
697 }
698 if (flag.deprecated_in.is_undefined() &&
699 flag.obsolete_in.is_undefined()) {
700 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
701 success = false;
702 }
703
704 if (!flag.deprecated_in.is_undefined()) {
705 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
706 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
707 success = false;
708 }
709
710 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
711 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
712 success = false;
713 }
714 }
715
716 if (!flag.obsolete_in.is_undefined()) {
717 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
718 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
719 success = false;
720 }
721
722 // if flag has become obsolete it should not have a "globals" flag defined anymore.
723 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
724 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
725 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
726 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
727 success = false;
728 }
729 }
730
731 } else if (!flag.expired_in.is_undefined()) {
732 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
733 success = false;
734 }
735
736 if (!flag.expired_in.is_undefined()) {
737 // if flag has become expired it should not have a "globals" flag defined anymore.
738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
739 !version_less_than(JDK_Version::current(), flag.expired_in)) {
740 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
741 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
742 success = false;
743 }
744 }
745 }
746 }
747 return success;
748 }
749 #endif
750
751 bool Arguments::atojulong(const char *s, julong* result) {
752 return parse_integer(s, result);
753 }
754
755 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
756 if (size < min_size) return arg_too_small;
757 if (size > max_size) return arg_too_big;
758 return arg_in_range;
759 }
760
761 // Describe an argument out of range error
762 void Arguments::describe_range_error(ArgsRange errcode) {
763 switch(errcode) {
764 case arg_too_big:
765 jio_fprintf(defaultStream::error_stream(),
766 "The specified size exceeds the maximum "
767 "representable size.\n");
768 break;
769 case arg_too_small:
770 case arg_unreadable:
771 case arg_in_range:
772 // do nothing for now
773 break;
774 default:
775 ShouldNotReachHere();
776 }
777 }
778
779 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
780 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
781 return true;
782 } else {
783 return false;
784 }
785 }
786
787 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
788 // strtod allows leading whitespace, but our flag format does not.
789 if (*value == '\0' || isspace(*value)) {
790 return false;
791 }
792 char* end;
793 errno = 0;
794 double v = strtod(value, &end);
795 if ((errno != 0) || (*end != 0)) {
796 return false;
797 }
798 if (g_isnan(v) || !g_isfinite(v)) {
799 // Currently we cannot handle these special values.
800 return false;
801 }
802
803 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
804 return true;
805 }
806 return false;
807 }
808
809 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
810 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
811
812 if (flag->is_int()) {
813 int v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_int(flag, &v, origin);
816 }
817 } else if (flag->is_uint()) {
818 uint v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uint(flag, &v, origin);
821 }
822 } else if (flag->is_intx()) {
823 intx v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_intx(flag, &v, origin);
826 }
827 } else if (flag->is_uintx()) {
828 uintx v;
829 if (parse_integer(value, &v)) {
830 result = JVMFlagAccess::set_uintx(flag, &v, origin);
831 }
832 } else if (flag->is_uint64_t()) {
833 uint64_t v;
834 if (parse_integer(value, &v)) {
835 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
836 }
837 } else if (flag->is_size_t()) {
838 size_t v;
839 if (parse_integer(value, &v)) {
840 result = JVMFlagAccess::set_size_t(flag, &v, origin);
841 }
842 }
843
844 return result == JVMFlag::SUCCESS;
845 }
846
847 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
848 if (value[0] == '\0') {
849 value = NULL;
850 }
851 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
852 // Contract: JVMFlag always returns a pointer that needs freeing.
853 FREE_C_HEAP_ARRAY(char, value);
854 return true;
855 }
856
857 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
858 const char* old_value = "";
859 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
860 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
861 size_t new_len = strlen(new_value);
862 const char* value;
863 char* free_this_too = NULL;
864 if (old_len == 0) {
865 value = new_value;
866 } else if (new_len == 0) {
867 value = old_value;
868 } else {
869 size_t length = old_len + 1 + new_len + 1;
870 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
871 // each new setting adds another LINE to the switch:
872 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
873 value = buf;
874 free_this_too = buf;
875 }
876 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
877 // JVMFlag always returns a pointer that needs freeing.
878 FREE_C_HEAP_ARRAY(char, value);
879 // JVMFlag made its own copy, so I must delete my own temp. buffer.
880 FREE_C_HEAP_ARRAY(char, free_this_too);
881 return true;
882 }
883
884 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
885 const char* real_name = real_flag_name(arg);
886 JDK_Version since = JDK_Version();
887 switch (is_deprecated_flag(arg, &since)) {
888 case -1: {
889 // Obsolete or expired, so don't process normally,
890 // but allow for an obsolete flag we're still
891 // temporarily allowing.
892 if (!is_obsolete_flag(arg, &since)) {
893 return real_name;
894 }
895 // Note if we're not considered obsolete then we can't be expired either
896 // as obsoletion must come first.
897 return NULL;
898 }
899 case 0:
900 return real_name;
901 case 1: {
902 char version[256];
903 since.to_string(version, sizeof(version));
904 if (real_name != arg) {
905 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
906 arg, version, real_name);
907 } else {
908 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
909 arg, version);
910 }
911 return real_name;
912 }
913 }
914 ShouldNotReachHere();
915 return NULL;
916 }
917
918 #define BUFLEN 255
919
920 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
921 char name_copied[BUFLEN+1];
922 if (name[name_length] != 0) {
923 if (name_length > BUFLEN) {
924 return NULL;
925 } else {
926 strncpy(name_copied, name, name_length);
927 name_copied[name_length] = '\0';
928 name = name_copied;
929 }
930 }
931
932 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
933 if (real_name == NULL) {
934 return NULL;
935 }
936 JVMFlag* flag = JVMFlag::find_flag(real_name);
937 return flag;
938 }
939
940 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
941 bool is_bool = false;
942 bool bool_val = false;
943 char c = *arg;
944 if (c == '+' || c == '-') {
945 is_bool = true;
946 bool_val = (c == '+');
947 arg++;
948 }
949
950 const char* name = arg;
951 while (true) {
952 c = *arg;
953 if (isalnum(c) || (c == '_')) {
954 ++arg;
955 } else {
956 break;
957 }
958 }
959
960 size_t name_len = size_t(arg - name);
961 if (name_len == 0) {
962 return false;
963 }
964
965 JVMFlag* flag = find_jvm_flag(name, name_len);
966 if (flag == NULL) {
967 return false;
968 }
969
970 if (is_bool) {
971 if (*arg != 0) {
972 // Error -- extra characters such as -XX:+BoolFlag=123
973 return false;
974 }
975 return set_bool_flag(flag, bool_val, origin);
976 }
977
978 if (arg[0] == '=') {
979 const char* value = arg + 1;
980 if (flag->is_ccstr()) {
981 if (flag->ccstr_accumulates()) {
982 return append_to_string_flag(flag, value, origin);
983 } else {
984 return set_string_flag(flag, value, origin);
985 }
986 } else if (flag->is_double()) {
987 return set_fp_numeric_flag(flag, value, origin);
988 } else {
989 return set_numeric_flag(flag, value, origin);
990 }
991 }
992
993 if (arg[0] == ':' && arg[1] == '=') {
994 // -XX:Foo:=xxx will reset the string flag to the given value.
995 const char* value = arg + 2;
996 return set_string_flag(flag, value, origin);
997 }
998
999 return false;
1000 }
1001
1002 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1003 assert(bldarray != NULL, "illegal argument");
1004
1005 if (arg == NULL) {
1006 return;
1007 }
1008
1009 int new_count = *count + 1;
1010
1011 // expand the array and add arg to the last element
1012 if (*bldarray == NULL) {
1013 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1014 } else {
1015 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1016 }
1017 (*bldarray)[*count] = os::strdup_check_oom(arg);
1018 *count = new_count;
1019 }
1020
1021 void Arguments::build_jvm_args(const char* arg) {
1022 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1023 }
1024
1025 void Arguments::build_jvm_flags(const char* arg) {
1026 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1027 }
1028
1029 // utility function to return a string that concatenates all
1030 // strings in a given char** array
1031 const char* Arguments::build_resource_string(char** args, int count) {
1032 if (args == NULL || count == 0) {
1033 return NULL;
1034 }
1035 size_t length = 0;
1036 for (int i = 0; i < count; i++) {
1037 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1038 }
1039 char* s = NEW_RESOURCE_ARRAY(char, length);
1040 char* dst = s;
1041 for (int j = 0; j < count; j++) {
1042 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1043 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1044 dst += offset;
1045 length -= offset;
1046 }
1047 return (const char*) s;
1048 }
1049
1050 void Arguments::print_on(outputStream* st) {
1051 st->print_cr("VM Arguments:");
1052 if (num_jvm_flags() > 0) {
1053 st->print("jvm_flags: "); print_jvm_flags_on(st);
1054 st->cr();
1055 }
1056 if (num_jvm_args() > 0) {
1057 st->print("jvm_args: "); print_jvm_args_on(st);
1058 st->cr();
1059 }
1060 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1061 if (_java_class_path != NULL) {
1062 char* path = _java_class_path->value();
1063 size_t len = strlen(path);
1064 st->print("java_class_path (initial): ");
1065 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1066 if (len == 0) {
1067 st->print_raw_cr("<not set>");
1068 } else {
1069 st->print_raw_cr(path, len);
1070 }
1071 }
1072 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1073 }
1074
1075 void Arguments::print_summary_on(outputStream* st) {
1076 // Print the command line. Environment variables that are helpful for
1077 // reproducing the problem are written later in the hs_err file.
1078 // flags are from setting file
1079 if (num_jvm_flags() > 0) {
1080 st->print_raw("Settings File: ");
1081 print_jvm_flags_on(st);
1082 st->cr();
1083 }
1084 // args are the command line and environment variable arguments.
1085 st->print_raw("Command Line: ");
1086 if (num_jvm_args() > 0) {
1087 print_jvm_args_on(st);
1088 }
1089 // this is the classfile and any arguments to the java program
1090 if (java_command() != NULL) {
1091 st->print("%s", java_command());
1092 }
1093 st->cr();
1094 }
1095
1096 void Arguments::print_jvm_flags_on(outputStream* st) {
1097 if (_num_jvm_flags > 0) {
1098 for (int i=0; i < _num_jvm_flags; i++) {
1099 st->print("%s ", _jvm_flags_array[i]);
1100 }
1101 }
1102 }
1103
1104 void Arguments::print_jvm_args_on(outputStream* st) {
1105 if (_num_jvm_args > 0) {
1106 for (int i=0; i < _num_jvm_args; i++) {
1107 st->print("%s ", _jvm_args_array[i]);
1108 }
1109 }
1110 }
1111
1112 bool Arguments::process_argument(const char* arg,
1113 jboolean ignore_unrecognized,
1114 JVMFlagOrigin origin) {
1115 JDK_Version since = JDK_Version();
1116
1117 if (parse_argument(arg, origin)) {
1118 return true;
1119 }
1120
1121 // Determine if the flag has '+', '-', or '=' characters.
1122 bool has_plus_minus = (*arg == '+' || *arg == '-');
1123 const char* const argname = has_plus_minus ? arg + 1 : arg;
1124
1125 size_t arg_len;
1126 const char* equal_sign = strchr(argname, '=');
1127 if (equal_sign == NULL) {
1128 arg_len = strlen(argname);
1129 } else {
1130 arg_len = equal_sign - argname;
1131 }
1132
1133 // Only make the obsolete check for valid arguments.
1134 if (arg_len <= BUFLEN) {
1135 // Construct a string which consists only of the argument name without '+', '-', or '='.
1136 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1137 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1138 if (is_obsolete_flag(stripped_argname, &since)) {
1139 char version[256];
1140 since.to_string(version, sizeof(version));
1141 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1142 return true;
1143 }
1144 }
1145
1146 // For locked flags, report a custom error message if available.
1147 // Otherwise, report the standard unrecognized VM option.
1148 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1149 if (found_flag != NULL) {
1150 char locked_message_buf[BUFLEN];
1151 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1152 if (strlen(locked_message_buf) == 0) {
1153 if (found_flag->is_bool() && !has_plus_minus) {
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Missing +/- setting for VM option '%s'\n", argname);
1156 } else if (!found_flag->is_bool() && has_plus_minus) {
1157 jio_fprintf(defaultStream::error_stream(),
1158 "Unexpected +/- setting in VM option '%s'\n", argname);
1159 } else {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Improperly specified VM option '%s'\n", argname);
1162 }
1163 } else {
1164 #ifdef PRODUCT
1165 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1166 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1167 if (ignore_unrecognized && mismatched) {
1168 return true;
1169 }
1170 #endif
1171 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1172 }
1173 } else {
1174 if (ignore_unrecognized) {
1175 return true;
1176 }
1177 jio_fprintf(defaultStream::error_stream(),
1178 "Unrecognized VM option '%s'\n", argname);
1179 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1180 if (fuzzy_matched != NULL) {
1181 jio_fprintf(defaultStream::error_stream(),
1182 "Did you mean '%s%s%s'? ",
1183 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1184 fuzzy_matched->name(),
1185 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1186 }
1187 }
1188
1189 // allow for commandline "commenting out" options like -XX:#+Verbose
1190 return arg[0] == '#';
1191 }
1192
1193 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1194 FILE* stream = os::fopen(file_name, "rb");
1195 if (stream == NULL) {
1196 if (should_exist) {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "Could not open settings file %s\n", file_name);
1199 return false;
1200 } else {
1201 return true;
1202 }
1203 }
1204
1205 char token[1024];
1206 int pos = 0;
1207
1208 bool in_white_space = true;
1209 bool in_comment = false;
1210 bool in_quote = false;
1211 char quote_c = 0;
1212 bool result = true;
1213
1214 int c = getc(stream);
1215 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1216 if (in_white_space) {
1217 if (in_comment) {
1218 if (c == '\n') in_comment = false;
1219 } else {
1220 if (c == '#') in_comment = true;
1221 else if (!isspace(c)) {
1222 in_white_space = false;
1223 token[pos++] = c;
1224 }
1225 }
1226 } else {
1227 if (c == '\n' || (!in_quote && isspace(c))) {
1228 // token ends at newline, or at unquoted whitespace
1229 // this allows a way to include spaces in string-valued options
1230 token[pos] = '\0';
1231 logOption(token);
1232 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1233 build_jvm_flags(token);
1234 pos = 0;
1235 in_white_space = true;
1236 in_quote = false;
1237 } else if (!in_quote && (c == '\'' || c == '"')) {
1238 in_quote = true;
1239 quote_c = c;
1240 } else if (in_quote && (c == quote_c)) {
1241 in_quote = false;
1242 } else {
1243 token[pos++] = c;
1244 }
1245 }
1246 c = getc(stream);
1247 }
1248 if (pos > 0) {
1249 token[pos] = '\0';
1250 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1251 build_jvm_flags(token);
1252 }
1253 fclose(stream);
1254 return result;
1255 }
1256
1257 //=============================================================================================================
1258 // Parsing of properties (-D)
1259
1260 const char* Arguments::get_property(const char* key) {
1261 return PropertyList_get_value(system_properties(), key);
1262 }
1263
1264 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1265 const char* eq = strchr(prop, '=');
1266 const char* key;
1267 const char* value = "";
1268
1269 if (eq == NULL) {
1270 // property doesn't have a value, thus use passed string
1271 key = prop;
1272 } else {
1273 // property have a value, thus extract it and save to the
1274 // allocated string
1275 size_t key_len = eq - prop;
1276 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1277
1278 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1279 key = tmp_key;
1280
1281 value = &prop[key_len + 1];
1282 }
1283
1284 #if INCLUDE_CDS
1285 if (is_internal_module_property(key) ||
1286 strcmp(key, "jdk.module.main") == 0) {
1287 MetaspaceShared::disable_optimized_module_handling();
1288 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1289 }
1290 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1291 strcmp(key, "jdk.module.validation") == 0 ||
1292 strcmp(key, "java.system.class.loader") == 0) {
1293 MetaspaceShared::disable_full_module_graph();
1294 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1295 }
1296 #endif
1297
1298 if (strcmp(key, "java.compiler") == 0) {
1299 process_java_compiler_argument(value);
1300 // Record value in Arguments, but let it get passed to Java.
1301 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1302 // sun.java.launcher.is_altjvm property is
1303 // private and is processed in process_sun_java_launcher_properties();
1304 // the sun.java.launcher property is passed on to the java application
1305 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1306 // append is true, writable is true, internal is false
1307 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1308 WriteableProperty, ExternalProperty);
1309 } else {
1310 if (strcmp(key, "sun.java.command") == 0) {
1311 char *old_java_command = _java_command;
1312 _java_command = os::strdup_check_oom(value, mtArguments);
1313 if (old_java_command != NULL) {
1314 os::free(old_java_command);
1315 }
1316 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1317 // If this property is set on the command line then its value will be
1318 // displayed in VM error logs as the URL at which to submit such logs.
1319 // Normally the URL displayed in error logs is different from the value
1320 // of this system property, so a different property should have been
1321 // used here, but we leave this as-is in case someone depends upon it.
1322 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1323 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1324 // its value without going through the property list or making a Java call.
1325 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1326 if (old_java_vendor_url_bug != NULL) {
1327 os::free((void *)old_java_vendor_url_bug);
1328 }
1329 }
1330
1331 // Create new property and add at the end of the list
1332 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1333 }
1334
1335 if (key != prop) {
1336 // SystemProperty copy passed value, thus free previously allocated
1337 // memory
1338 FreeHeap((void *)key);
1339 }
1340
1341 return true;
1342 }
1343
1344 #if INCLUDE_CDS
1345 const char* unsupported_properties[] = { "jdk.module.limitmods",
1346 "jdk.module.upgrade.path",
1347 "jdk.module.patch.0" };
1348 const char* unsupported_options[] = { "--limit-modules",
1349 "--upgrade-module-path",
1350 "--patch-module"
1351 };
1352 void Arguments::check_unsupported_dumping_properties() {
1353 assert(is_dumping_archive(),
1354 "this function is only used with CDS dump time");
1355 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1356 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1357 SystemProperty* sp = system_properties();
1358 while (sp != NULL) {
1359 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1360 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1361 vm_exit_during_initialization(
1362 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1363 }
1364 }
1365 sp = sp->next();
1366 }
1367
1368 // Check for an exploded module build in use with -Xshare:dump.
1369 if (!has_jimage()) {
1370 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1371 }
1372 }
1373
1374 bool Arguments::check_unsupported_cds_runtime_properties() {
1375 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1376 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1377 if (ArchiveClassesAtExit != NULL) {
1378 // dynamic dumping, just return false for now.
1379 // check_unsupported_dumping_properties() will be called later to check the same set of
1380 // properties, and will exit the VM with the correct error message if the unsupported properties
1381 // are used.
1382 return false;
1383 }
1384 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1385 if (get_property(unsupported_properties[i]) != NULL) {
1386 if (RequireSharedSpaces) {
1387 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1388 } else {
1389 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1390 }
1391 return true;
1392 }
1393 }
1394 return false;
1395 }
1396 #endif
1397
1398 //===========================================================================================================
1399 // Setting int/mixed/comp mode flags
1400
1401 void Arguments::set_mode_flags(Mode mode) {
1402 // Set up default values for all flags.
1403 // If you add a flag to any of the branches below,
1404 // add a default value for it here.
1405 set_java_compiler(false);
1406 _mode = mode;
1407
1408 // Ensure Agent_OnLoad has the correct initial values.
1409 // This may not be the final mode; mode may change later in onload phase.
1410 PropertyList_unique_add(&_system_properties, "java.vm.info",
1411 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1412
1413 UseInterpreter = true;
1414 UseCompiler = true;
1415 UseLoopCounter = true;
1416
1417 // Default values may be platform/compiler dependent -
1418 // use the saved values
1419 ClipInlining = Arguments::_ClipInlining;
1420 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1421 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1422 BackgroundCompilation = Arguments::_BackgroundCompilation;
1423
1424 // Change from defaults based on mode
1425 switch (mode) {
1426 default:
1427 ShouldNotReachHere();
1428 break;
1429 case _int:
1430 UseCompiler = false;
1431 UseLoopCounter = false;
1432 AlwaysCompileLoopMethods = false;
1433 UseOnStackReplacement = false;
1434 break;
1435 case _mixed:
1436 // same as default
1437 break;
1438 case _comp:
1439 UseInterpreter = false;
1440 BackgroundCompilation = false;
1441 ClipInlining = false;
1442 break;
1443 }
1444 }
1445
1446 // Conflict: required to use shared spaces (-Xshare:on), but
1447 // incompatible command line options were chosen.
1448 static void no_shared_spaces(const char* message) {
1449 if (RequireSharedSpaces) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "Class data sharing is inconsistent with other specified options.\n");
1452 vm_exit_during_initialization("Unable to use shared archive", message);
1453 } else {
1454 log_info(cds)("Unable to use shared archive: %s", message);
1455 UseSharedSpaces = false;
1456 }
1457 }
1458
1459 void set_object_alignment() {
1460 // Object alignment.
1461 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1462 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1463 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1464 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1465 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1466 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1467
1468 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1469 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1470
1471 // Oop encoding heap max
1472 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1473 }
1474
1475 size_t Arguments::max_heap_for_compressed_oops() {
1476 // Avoid sign flip.
1477 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1478 // We need to fit both the NULL page and the heap into the memory budget, while
1479 // keeping alignment constraints of the heap. To guarantee the latter, as the
1480 // NULL page is located before the heap, we pad the NULL page to the conservative
1481 // maximum alignment that the GC may ever impose upon the heap.
1482 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1483 _conservative_max_heap_alignment);
1484
1485 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1486 NOT_LP64(ShouldNotReachHere(); return 0);
1487 }
1488
1489 void Arguments::set_use_compressed_oops() {
1490 #ifdef _LP64
1491 // MaxHeapSize is not set up properly at this point, but
1492 // the only value that can override MaxHeapSize if we are
1493 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1494 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1495
1496 if (max_heap_size <= max_heap_for_compressed_oops()) {
1497 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1498 FLAG_SET_ERGO(UseCompressedOops, true);
1499 }
1500 } else {
1501 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1502 warning("Max heap size too large for Compressed Oops");
1503 FLAG_SET_DEFAULT(UseCompressedOops, false);
1504 }
1505 }
1506 #endif // _LP64
1507 }
1508
1509 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1510 // set_use_compressed_oops().
1511 void Arguments::set_use_compressed_klass_ptrs() {
1512 #ifdef _LP64
1513 if (!UseCompressedClassPointers) {
1514 // Lilliput requires compressed class pointers. Default shall reflect that.
1515 // If user specifies -UseCompressedClassPointers, it should be reverted with
1516 // a warning.
1517 assert(!FLAG_IS_DEFAULT(UseCompressedClassPointers), "Wrong default for UseCompressedClassPointers");
1518 warning("Lilliput reqires compressed class pointers.");
1519 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1520 }
1521 // Assert validity of compressed class space size. User arg should have been checked at this point
1522 // (see CompressedClassSpaceSizeConstraintFunc()), so no need to be nice about it, this fires in
1523 // case the default is wrong.
1524 assert(CompressedClassSpaceSize <= Metaspace::max_class_space_size(),
1525 "CompressedClassSpaceSize " SIZE_FORMAT " too large (max: " SIZE_FORMAT ")",
1526 CompressedClassSpaceSize, Metaspace::max_class_space_size());
1527 #endif // _LP64
1528 }
1529
1530 void Arguments::set_conservative_max_heap_alignment() {
1531 // The conservative maximum required alignment for the heap is the maximum of
1532 // the alignments imposed by several sources: any requirements from the heap
1533 // itself and the maximum page size we may run the VM with.
1534 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1535 _conservative_max_heap_alignment = MAX4(heap_alignment,
1536 (size_t)os::vm_allocation_granularity(),
1537 os::max_page_size(),
1538 GCArguments::compute_heap_alignment());
1539 }
1540
1541 jint Arguments::set_ergonomics_flags() {
1542 GCConfig::initialize();
1543
1544 set_conservative_max_heap_alignment();
1545
1546 #ifdef _LP64
1547 set_use_compressed_oops();
1548
1549 // set_use_compressed_klass_ptrs() must be called after calling
1550 // set_use_compressed_oops().
1551 set_use_compressed_klass_ptrs();
1552
1553 // Also checks that certain machines are slower with compressed oops
1554 // in vm_version initialization code.
1555 #endif // _LP64
1556
1557 return JNI_OK;
1558 }
1559
1560 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1561 size_t max_allocatable;
1562 size_t result = limit;
1563 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1564 // The AggressiveHeap check is a temporary workaround to avoid calling
1565 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1566 // selected. This works because AggressiveHeap implies UseParallelGC
1567 // where we know the ratio will be 1. Once the AggressiveHeap option is
1568 // removed, this can be cleaned up.
1569 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1570 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1571 result = MIN2(result, max_allocatable / fraction);
1572 }
1573 return result;
1574 }
1575
1576 // Use static initialization to get the default before parsing
1577 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1578
1579 void Arguments::set_heap_size() {
1580 julong phys_mem;
1581
1582 // If the user specified one of these options, they
1583 // want specific memory sizing so do not limit memory
1584 // based on compressed oops addressability.
1585 // Also, memory limits will be calculated based on
1586 // available os physical memory, not our MaxRAM limit,
1587 // unless MaxRAM is also specified.
1588 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1589 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1590 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1591 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1592 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1593 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1594 !FLAG_IS_DEFAULT(MaxRAM));
1595 if (override_coop_limit) {
1596 if (FLAG_IS_DEFAULT(MaxRAM)) {
1597 phys_mem = os::physical_memory();
1598 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1599 } else {
1600 phys_mem = (julong)MaxRAM;
1601 }
1602 } else {
1603 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1604 : (julong)MaxRAM;
1605 }
1606
1607
1608 // Convert deprecated flags
1609 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1610 !FLAG_IS_DEFAULT(MaxRAMFraction))
1611 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1612
1613 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1614 !FLAG_IS_DEFAULT(MinRAMFraction))
1615 MinRAMPercentage = 100.0 / MinRAMFraction;
1616
1617 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1618 !FLAG_IS_DEFAULT(InitialRAMFraction))
1619 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1620
1621 // If the maximum heap size has not been set with -Xmx,
1622 // then set it as fraction of the size of physical memory,
1623 // respecting the maximum and minimum sizes of the heap.
1624 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1625 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1626 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1627 if (reasonable_min < MaxHeapSize) {
1628 // Small physical memory, so use a minimum fraction of it for the heap
1629 reasonable_max = reasonable_min;
1630 } else {
1631 // Not-small physical memory, so require a heap at least
1632 // as large as MaxHeapSize
1633 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1634 }
1635
1636 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1637 // Limit the heap size to ErgoHeapSizeLimit
1638 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1639 }
1640
1641 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1642
1643 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1644 // An initial heap size was specified on the command line,
1645 // so be sure that the maximum size is consistent. Done
1646 // after call to limit_heap_by_allocatable_memory because that
1647 // method might reduce the allocation size.
1648 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1649 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1650 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1651 }
1652
1653 #ifdef _LP64
1654 if (UseCompressedOops || UseCompressedClassPointers) {
1655 // HeapBaseMinAddress can be greater than default but not less than.
1656 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1657 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1658 // matches compressed oops printing flags
1659 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1660 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1661 DefaultHeapBaseMinAddress,
1662 DefaultHeapBaseMinAddress/G,
1663 HeapBaseMinAddress);
1664 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1665 }
1666 }
1667 }
1668 if (UseCompressedOops) {
1669 // Limit the heap size to the maximum possible when using compressed oops
1670 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1671
1672 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1673 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1674 // but it should be not less than default MaxHeapSize.
1675 max_coop_heap -= HeapBaseMinAddress;
1676 }
1677
1678 // If user specified flags prioritizing os physical
1679 // memory limits, then disable compressed oops if
1680 // limits exceed max_coop_heap and UseCompressedOops
1681 // was not specified.
1682 if (reasonable_max > max_coop_heap) {
1683 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1684 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1685 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1686 "Please check the setting of MaxRAMPercentage %5.2f."
1687 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1688 FLAG_SET_ERGO(UseCompressedOops, false);
1689 } else {
1690 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1691 }
1692 }
1693 }
1694 #endif // _LP64
1695
1696 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1697 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1698 }
1699
1700 // If the minimum or initial heap_size have not been set or requested to be set
1701 // ergonomically, set them accordingly.
1702 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1703 julong reasonable_minimum = (julong)(OldSize + NewSize);
1704
1705 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1706
1707 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1708
1709 if (InitialHeapSize == 0) {
1710 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1711 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1712
1713 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1714 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1715
1716 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1717 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1718 }
1719 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1720 // synchronize with InitialHeapSize to avoid errors with the default value.
1721 if (MinHeapSize == 0) {
1722 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1723 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1724 }
1725 }
1726 }
1727
1728 // This option inspects the machine and attempts to set various
1729 // parameters to be optimal for long-running, memory allocation
1730 // intensive jobs. It is intended for machines with large
1731 // amounts of cpu and memory.
1732 jint Arguments::set_aggressive_heap_flags() {
1733 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1734 // VM, but we may not be able to represent the total physical memory
1735 // available (like having 8gb of memory on a box but using a 32bit VM).
1736 // Thus, we need to make sure we're using a julong for intermediate
1737 // calculations.
1738 julong initHeapSize;
1739 julong total_memory = os::physical_memory();
1740
1741 if (total_memory < (julong) 256 * M) {
1742 jio_fprintf(defaultStream::error_stream(),
1743 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1744 vm_exit(1);
1745 }
1746
1747 // The heap size is half of available memory, or (at most)
1748 // all of possible memory less 160mb (leaving room for the OS
1749 // when using ISM). This is the maximum; because adaptive sizing
1750 // is turned on below, the actual space used may be smaller.
1751
1752 initHeapSize = MIN2(total_memory / (julong) 2,
1753 total_memory - (julong) 160 * M);
1754
1755 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1756
1757 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1758 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1759 return JNI_EINVAL;
1760 }
1761 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1762 return JNI_EINVAL;
1763 }
1764 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1765 return JNI_EINVAL;
1766 }
1767 }
1768 if (FLAG_IS_DEFAULT(NewSize)) {
1769 // Make the young generation 3/8ths of the total heap.
1770 if (FLAG_SET_CMDLINE(NewSize,
1771 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1772 return JNI_EINVAL;
1773 }
1774 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1775 return JNI_EINVAL;
1776 }
1777 }
1778
1779 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1780 FLAG_SET_DEFAULT(UseLargePages, true);
1781 #endif
1782
1783 // Increase some data structure sizes for efficiency
1784 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1785 return JNI_EINVAL;
1786 }
1787 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1788 return JNI_EINVAL;
1789 }
1790 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1791 return JNI_EINVAL;
1792 }
1793
1794 // See the OldPLABSize comment below, but replace 'after promotion'
1795 // with 'after copying'. YoungPLABSize is the size of the survivor
1796 // space per-gc-thread buffers. The default is 4kw.
1797 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1798 return JNI_EINVAL;
1799 }
1800
1801 // OldPLABSize is the size of the buffers in the old gen that
1802 // UseParallelGC uses to promote live data that doesn't fit in the
1803 // survivor spaces. At any given time, there's one for each gc thread.
1804 // The default size is 1kw. These buffers are rarely used, since the
1805 // survivor spaces are usually big enough. For specjbb, however, there
1806 // are occasions when there's lots of live data in the young gen
1807 // and we end up promoting some of it. We don't have a definite
1808 // explanation for why bumping OldPLABSize helps, but the theory
1809 // is that a bigger PLAB results in retaining something like the
1810 // original allocation order after promotion, which improves mutator
1811 // locality. A minor effect may be that larger PLABs reduce the
1812 // number of PLAB allocation events during gc. The value of 8kw
1813 // was arrived at by experimenting with specjbb.
1814 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1815 return JNI_EINVAL;
1816 }
1817
1818 // Enable parallel GC and adaptive generation sizing
1819 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1820 return JNI_EINVAL;
1821 }
1822
1823 // Encourage steady state memory management
1824 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1825 return JNI_EINVAL;
1826 }
1827
1828 // This appears to improve mutator locality
1829 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1830 return JNI_EINVAL;
1831 }
1832
1833 return JNI_OK;
1834 }
1835
1836 // This must be called after ergonomics.
1837 void Arguments::set_bytecode_flags() {
1838 if (!RewriteBytecodes) {
1839 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1840 }
1841 }
1842
1843 // Aggressive optimization flags
1844 jint Arguments::set_aggressive_opts_flags() {
1845 #ifdef COMPILER2
1846 if (AggressiveUnboxing) {
1847 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1848 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1849 } else if (!EliminateAutoBox) {
1850 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1851 AggressiveUnboxing = false;
1852 }
1853 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1854 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1855 } else if (!DoEscapeAnalysis) {
1856 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1857 AggressiveUnboxing = false;
1858 }
1859 }
1860 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1861 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1862 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1863 }
1864 // Feed the cache size setting into the JDK
1865 char buffer[1024];
1866 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1867 if (!add_property(buffer)) {
1868 return JNI_ENOMEM;
1869 }
1870 }
1871 #endif
1872
1873 return JNI_OK;
1874 }
1875
1876 //===========================================================================================================
1877 // Parsing of java.compiler property
1878
1879 void Arguments::process_java_compiler_argument(const char* arg) {
1880 // For backwards compatibility, Djava.compiler=NONE or ""
1881 // causes us to switch to -Xint mode UNLESS -Xdebug
1882 // is also specified.
1883 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1884 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1885 }
1886 }
1887
1888 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1889 _sun_java_launcher = os::strdup_check_oom(launcher);
1890 }
1891
1892 bool Arguments::created_by_java_launcher() {
1893 assert(_sun_java_launcher != NULL, "property must have value");
1894 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1895 }
1896
1897 bool Arguments::sun_java_launcher_is_altjvm() {
1898 return _sun_java_launcher_is_altjvm;
1899 }
1900
1901 //===========================================================================================================
1902 // Parsing of main arguments
1903
1904 unsigned int addreads_count = 0;
1905 unsigned int addexports_count = 0;
1906 unsigned int addopens_count = 0;
1907 unsigned int addmods_count = 0;
1908 unsigned int patch_mod_count = 0;
1909 unsigned int enable_native_access_count = 0;
1910
1911 // Check the consistency of vm_init_args
1912 bool Arguments::check_vm_args_consistency() {
1913 // Method for adding checks for flag consistency.
1914 // The intent is to warn the user of all possible conflicts,
1915 // before returning an error.
1916 // Note: Needs platform-dependent factoring.
1917 bool status = true;
1918
1919 if (TLABRefillWasteFraction == 0) {
1920 jio_fprintf(defaultStream::error_stream(),
1921 "TLABRefillWasteFraction should be a denominator, "
1922 "not " SIZE_FORMAT "\n",
1923 TLABRefillWasteFraction);
1924 status = false;
1925 }
1926
1927 status = CompilerConfig::check_args_consistency(status);
1928 #if INCLUDE_JVMCI
1929 if (status && EnableJVMCI) {
1930 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1931 AddProperty, UnwriteableProperty, InternalProperty);
1932 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1933 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1934 return false;
1935 }
1936 }
1937 }
1938 #endif
1939
1940 #if INCLUDE_JFR
1941 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1942 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1943 return false;
1944 }
1945 }
1946 #endif
1947
1948 #ifndef SUPPORT_RESERVED_STACK_AREA
1949 if (StackReservedPages != 0) {
1950 FLAG_SET_CMDLINE(StackReservedPages, 0);
1951 warning("Reserved Stack Area not supported on this platform");
1952 }
1953 #endif
1954
1955 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64)
1956 if (UseHeavyMonitors) {
1957 jio_fprintf(defaultStream::error_stream(),
1958 "UseHeavyMonitors is not fully implemented on this architecture");
1959 return false;
1960 }
1961 #endif
1962 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
1963 if (UseHeavyMonitors && UseRTMForStackLocks) {
1964 jio_fprintf(defaultStream::error_stream(),
1965 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive");
1966
1967 return false;
1968 }
1969 #endif
1970 if (VerifyHeavyMonitors && !UseHeavyMonitors) {
1971 jio_fprintf(defaultStream::error_stream(),
1972 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors");
1973 return false;
1974 }
1975
1976 return status;
1977 }
1978
1979 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1980 const char* option_type) {
1981 if (ignore) return false;
1982
1983 const char* spacer = " ";
1984 if (option_type == NULL) {
1985 option_type = ++spacer; // Set both to the empty string.
1986 }
1987
1988 jio_fprintf(defaultStream::error_stream(),
1989 "Unrecognized %s%soption: %s\n", option_type, spacer,
1990 option->optionString);
1991 return true;
1992 }
1993
1994 static const char* user_assertion_options[] = {
1995 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1996 };
1997
1998 static const char* system_assertion_options[] = {
1999 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2000 };
2001
2002 bool Arguments::parse_uintx(const char* value,
2003 uintx* uintx_arg,
2004 uintx min_size) {
2005 uintx n;
2006 if (!parse_integer(value, &n)) {
2007 return false;
2008 }
2009 if (n >= min_size) {
2010 *uintx_arg = n;
2011 return true;
2012 } else {
2013 return false;
2014 }
2015 }
2016
2017 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2018 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
2019 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2020 char* property = AllocateHeap(prop_len, mtArguments);
2021 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2022 if (ret < 0 || ret >= (int)prop_len) {
2023 FreeHeap(property);
2024 return false;
2025 }
2026 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2027 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2028 // that multiple occurrences of the associated flag just causes the existing property value to be
2029 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2030 // to a property after we have finished flag processing.
2031 bool added = add_property(property, WriteableProperty, internal);
2032 FreeHeap(property);
2033 return added;
2034 }
2035
2036 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2037 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2038 const unsigned int props_count_limit = 1000;
2039 const int max_digits = 3;
2040 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2041
2042 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2043 if (count < props_count_limit) {
2044 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2045 char* property = AllocateHeap(prop_len, mtArguments);
2046 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2047 if (ret < 0 || ret >= (int)prop_len) {
2048 FreeHeap(property);
2049 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2050 return false;
2051 }
2052 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2053 FreeHeap(property);
2054 return added;
2055 }
2056
2057 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2058 return false;
2059 }
2060
2061 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2062 julong* long_arg,
2063 julong min_size,
2064 julong max_size) {
2065 if (!parse_integer(s, long_arg)) return arg_unreadable;
2066 return check_memory_size(*long_arg, min_size, max_size);
2067 }
2068
2069 // Parse JavaVMInitArgs structure
2070
2071 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2072 const JavaVMInitArgs *java_tool_options_args,
2073 const JavaVMInitArgs *java_options_args,
2074 const JavaVMInitArgs *cmd_line_args) {
2075 bool patch_mod_javabase = false;
2076
2077 // Save default settings for some mode flags
2078 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2079 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2080 Arguments::_ClipInlining = ClipInlining;
2081 Arguments::_BackgroundCompilation = BackgroundCompilation;
2082
2083 // Remember the default value of SharedBaseAddress.
2084 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2085
2086 // Setup flags for mixed which is the default
2087 set_mode_flags(_mixed);
2088
2089 // Parse args structure generated from java.base vm options resource
2090 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2091 if (result != JNI_OK) {
2092 return result;
2093 }
2094
2095 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2096 // variable (if present).
2097 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2098 if (result != JNI_OK) {
2099 return result;
2100 }
2101
2102 // Parse args structure generated from the command line flags.
2103 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2104 if (result != JNI_OK) {
2105 return result;
2106 }
2107
2108 // Parse args structure generated from the _JAVA_OPTIONS environment
2109 // variable (if present) (mimics classic VM)
2110 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2111 if (result != JNI_OK) {
2112 return result;
2113 }
2114
2115 // We need to ensure processor and memory resources have been properly
2116 // configured - which may rely on arguments we just processed - before
2117 // doing the final argument processing. Any argument processing that
2118 // needs to know about processor and memory resources must occur after
2119 // this point.
2120
2121 os::init_container_support();
2122
2123 // Do final processing now that all arguments have been parsed
2124 result = finalize_vm_init_args(patch_mod_javabase);
2125 if (result != JNI_OK) {
2126 return result;
2127 }
2128
2129 return JNI_OK;
2130 }
2131
2132 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2133 // represents a valid JDWP agent. is_path==true denotes that we
2134 // are dealing with -agentpath (case where name is a path), otherwise with
2135 // -agentlib
2136 bool valid_jdwp_agent(char *name, bool is_path) {
2137 char *_name;
2138 const char *_jdwp = "jdwp";
2139 size_t _len_jdwp, _len_prefix;
2140
2141 if (is_path) {
2142 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2143 return false;
2144 }
2145
2146 _name++; // skip past last path separator
2147 _len_prefix = strlen(JNI_LIB_PREFIX);
2148
2149 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2150 return false;
2151 }
2152
2153 _name += _len_prefix;
2154 _len_jdwp = strlen(_jdwp);
2155
2156 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2157 _name += _len_jdwp;
2158 }
2159 else {
2160 return false;
2161 }
2162
2163 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2164 return false;
2165 }
2166
2167 return true;
2168 }
2169
2170 if (strcmp(name, _jdwp) == 0) {
2171 return true;
2172 }
2173
2174 return false;
2175 }
2176
2177 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2178 // --patch-module=<module>=<file>(<pathsep><file>)*
2179 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2180 // Find the equal sign between the module name and the path specification
2181 const char* module_equal = strchr(patch_mod_tail, '=');
2182 if (module_equal == NULL) {
2183 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2184 return JNI_ERR;
2185 } else {
2186 // Pick out the module name
2187 size_t module_len = module_equal - patch_mod_tail;
2188 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2189 if (module_name != NULL) {
2190 memcpy(module_name, patch_mod_tail, module_len);
2191 *(module_name + module_len) = '\0';
2192 // The path piece begins one past the module_equal sign
2193 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2194 FREE_C_HEAP_ARRAY(char, module_name);
2195 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2196 return JNI_ENOMEM;
2197 }
2198 } else {
2199 return JNI_ENOMEM;
2200 }
2201 }
2202 return JNI_OK;
2203 }
2204
2205 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2206 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2207 // The min and max sizes match the values in globals.hpp, but scaled
2208 // with K. The values have been chosen so that alignment with page
2209 // size doesn't change the max value, which makes the conversions
2210 // back and forth between Xss value and ThreadStackSize value easier.
2211 // The values have also been chosen to fit inside a 32-bit signed type.
2212 const julong min_ThreadStackSize = 0;
2213 const julong max_ThreadStackSize = 1 * M;
2214
2215 // Make sure the above values match the range set in globals.hpp
2216 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2217 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2218 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2219
2220 const julong min_size = min_ThreadStackSize * K;
2221 const julong max_size = max_ThreadStackSize * K;
2222
2223 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2224
2225 julong size = 0;
2226 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2227 if (errcode != arg_in_range) {
2228 bool silent = (option == NULL); // Allow testing to silence error messages
2229 if (!silent) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "Invalid thread stack size: %s\n", option->optionString);
2232 describe_range_error(errcode);
2233 }
2234 return JNI_EINVAL;
2235 }
2236
2237 // Internally track ThreadStackSize in units of 1024 bytes.
2238 const julong size_aligned = align_up(size, K);
2239 assert(size <= size_aligned,
2240 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2241 size, size_aligned);
2242
2243 const julong size_in_K = size_aligned / K;
2244 assert(size_in_K < (julong)max_intx,
2245 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2246 size_in_K);
2247
2248 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2249 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2250 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2251 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2252 max_expanded, size_in_K);
2253
2254 *out_ThreadStackSize = (intx)size_in_K;
2255
2256 return JNI_OK;
2257 }
2258
2259 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2260 // For match_option to return remaining or value part of option string
2261 const char* tail;
2262
2263 // iterate over arguments
2264 for (int index = 0; index < args->nOptions; index++) {
2265 bool is_absolute_path = false; // for -agentpath vs -agentlib
2266
2267 const JavaVMOption* option = args->options + index;
2268
2269 if (!match_option(option, "-Djava.class.path", &tail) &&
2270 !match_option(option, "-Dsun.java.command", &tail) &&
2271 !match_option(option, "-Dsun.java.launcher", &tail)) {
2272
2273 // add all jvm options to the jvm_args string. This string
2274 // is used later to set the java.vm.args PerfData string constant.
2275 // the -Djava.class.path and the -Dsun.java.command options are
2276 // omitted from jvm_args string as each have their own PerfData
2277 // string constant object.
2278 build_jvm_args(option->optionString);
2279 }
2280
2281 // -verbose:[class/module/gc/jni]
2282 if (match_option(option, "-verbose", &tail)) {
2283 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2284 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2285 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2286 } else if (!strcmp(tail, ":module")) {
2287 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2288 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2289 } else if (!strcmp(tail, ":gc")) {
2290 if (_legacyGCLogging.lastFlag == 0) {
2291 _legacyGCLogging.lastFlag = 1;
2292 }
2293 } else if (!strcmp(tail, ":jni")) {
2294 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2295 }
2296 // -da / -ea / -disableassertions / -enableassertions
2297 // These accept an optional class/package name separated by a colon, e.g.,
2298 // -da:java.lang.Thread.
2299 } else if (match_option(option, user_assertion_options, &tail, true)) {
2300 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2301 if (*tail == '\0') {
2302 JavaAssertions::setUserClassDefault(enable);
2303 } else {
2304 assert(*tail == ':', "bogus match by match_option()");
2305 JavaAssertions::addOption(tail + 1, enable);
2306 }
2307 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2308 } else if (match_option(option, system_assertion_options, &tail, false)) {
2309 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2310 JavaAssertions::setSystemClassDefault(enable);
2311 // -bootclasspath:
2312 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2313 jio_fprintf(defaultStream::output_stream(),
2314 "-Xbootclasspath is no longer a supported option.\n");
2315 return JNI_EINVAL;
2316 // -bootclasspath/a:
2317 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2318 Arguments::append_sysclasspath(tail);
2319 #if INCLUDE_CDS
2320 MetaspaceShared::disable_optimized_module_handling();
2321 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2322 #endif
2323 // -bootclasspath/p:
2324 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2325 jio_fprintf(defaultStream::output_stream(),
2326 "-Xbootclasspath/p is no longer a supported option.\n");
2327 return JNI_EINVAL;
2328 // -Xrun
2329 } else if (match_option(option, "-Xrun", &tail)) {
2330 if (tail != NULL) {
2331 const char* pos = strchr(tail, ':');
2332 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2333 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2334 jio_snprintf(name, len + 1, "%s", tail);
2335
2336 char *options = NULL;
2337 if(pos != NULL) {
2338 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2339 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2340 }
2341 #if !INCLUDE_JVMTI
2342 if (strcmp(name, "jdwp") == 0) {
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Debugging agents are not supported in this VM\n");
2345 return JNI_ERR;
2346 }
2347 #endif // !INCLUDE_JVMTI
2348 add_init_library(name, options);
2349 }
2350 } else if (match_option(option, "--add-reads=", &tail)) {
2351 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2352 return JNI_ENOMEM;
2353 }
2354 } else if (match_option(option, "--add-exports=", &tail)) {
2355 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2356 return JNI_ENOMEM;
2357 }
2358 } else if (match_option(option, "--add-opens=", &tail)) {
2359 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2360 return JNI_ENOMEM;
2361 }
2362 } else if (match_option(option, "--add-modules=", &tail)) {
2363 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2364 return JNI_ENOMEM;
2365 }
2366 } else if (match_option(option, "--enable-native-access=", &tail)) {
2367 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2368 return JNI_ENOMEM;
2369 }
2370 } else if (match_option(option, "--limit-modules=", &tail)) {
2371 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2372 return JNI_ENOMEM;
2373 }
2374 } else if (match_option(option, "--module-path=", &tail)) {
2375 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2376 return JNI_ENOMEM;
2377 }
2378 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2379 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2380 return JNI_ENOMEM;
2381 }
2382 } else if (match_option(option, "--patch-module=", &tail)) {
2383 // --patch-module=<module>=<file>(<pathsep><file>)*
2384 int res = process_patch_mod_option(tail, patch_mod_javabase);
2385 if (res != JNI_OK) {
2386 return res;
2387 }
2388 } else if (match_option(option, "--illegal-access=", &tail)) {
2389 char version[256];
2390 JDK_Version::jdk(17).to_string(version, sizeof(version));
2391 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2392 // -agentlib and -agentpath
2393 } else if (match_option(option, "-agentlib:", &tail) ||
2394 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2395 if(tail != NULL) {
2396 const char* pos = strchr(tail, '=');
2397 char* name;
2398 if (pos == NULL) {
2399 name = os::strdup_check_oom(tail, mtArguments);
2400 } else {
2401 size_t len = pos - tail;
2402 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2403 memcpy(name, tail, len);
2404 name[len] = '\0';
2405 }
2406
2407 char *options = NULL;
2408 if(pos != NULL) {
2409 options = os::strdup_check_oom(pos + 1, mtArguments);
2410 }
2411 #if !INCLUDE_JVMTI
2412 if (valid_jdwp_agent(name, is_absolute_path)) {
2413 jio_fprintf(defaultStream::error_stream(),
2414 "Debugging agents are not supported in this VM\n");
2415 return JNI_ERR;
2416 }
2417 #endif // !INCLUDE_JVMTI
2418 add_init_agent(name, options, is_absolute_path);
2419 }
2420 // -javaagent
2421 } else if (match_option(option, "-javaagent:", &tail)) {
2422 #if !INCLUDE_JVMTI
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Instrumentation agents are not supported in this VM\n");
2425 return JNI_ERR;
2426 #else
2427 if (tail != NULL) {
2428 size_t length = strlen(tail) + 1;
2429 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2430 jio_snprintf(options, length, "%s", tail);
2431 add_instrument_agent("instrument", options, false);
2432 // java agents need module java.instrument
2433 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2434 return JNI_ENOMEM;
2435 }
2436 }
2437 #endif // !INCLUDE_JVMTI
2438 // --enable_preview
2439 } else if (match_option(option, "--enable-preview")) {
2440 set_enable_preview();
2441 // -Xnoclassgc
2442 } else if (match_option(option, "-Xnoclassgc")) {
2443 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2444 return JNI_EINVAL;
2445 }
2446 // -Xbatch
2447 } else if (match_option(option, "-Xbatch")) {
2448 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2449 return JNI_EINVAL;
2450 }
2451 // -Xmn for compatibility with other JVM vendors
2452 } else if (match_option(option, "-Xmn", &tail)) {
2453 julong long_initial_young_size = 0;
2454 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2455 if (errcode != arg_in_range) {
2456 jio_fprintf(defaultStream::error_stream(),
2457 "Invalid initial young generation size: %s\n", option->optionString);
2458 describe_range_error(errcode);
2459 return JNI_EINVAL;
2460 }
2461 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2462 return JNI_EINVAL;
2463 }
2464 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 // -Xms
2468 } else if (match_option(option, "-Xms", &tail)) {
2469 julong size = 0;
2470 // an initial heap size of 0 means automatically determine
2471 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2472 if (errcode != arg_in_range) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Invalid initial heap size: %s\n", option->optionString);
2475 describe_range_error(errcode);
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2482 return JNI_EINVAL;
2483 }
2484 // -Xmx
2485 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2486 julong long_max_heap_size = 0;
2487 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2488 if (errcode != arg_in_range) {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "Invalid maximum heap size: %s\n", option->optionString);
2491 describe_range_error(errcode);
2492 return JNI_EINVAL;
2493 }
2494 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2495 return JNI_EINVAL;
2496 }
2497 // Xmaxf
2498 } else if (match_option(option, "-Xmaxf", &tail)) {
2499 char* err;
2500 int maxf = (int)(strtod(tail, &err) * 100);
2501 if (*err != '\0' || *tail == '\0') {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "Bad max heap free percentage size: %s\n",
2504 option->optionString);
2505 return JNI_EINVAL;
2506 } else {
2507 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2508 return JNI_EINVAL;
2509 }
2510 }
2511 // Xminf
2512 } else if (match_option(option, "-Xminf", &tail)) {
2513 char* err;
2514 int minf = (int)(strtod(tail, &err) * 100);
2515 if (*err != '\0' || *tail == '\0') {
2516 jio_fprintf(defaultStream::error_stream(),
2517 "Bad min heap free percentage size: %s\n",
2518 option->optionString);
2519 return JNI_EINVAL;
2520 } else {
2521 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2522 return JNI_EINVAL;
2523 }
2524 }
2525 // -Xss
2526 } else if (match_option(option, "-Xss", &tail)) {
2527 intx value = 0;
2528 jint err = parse_xss(option, tail, &value);
2529 if (err != JNI_OK) {
2530 return err;
2531 }
2532 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2533 return JNI_EINVAL;
2534 }
2535 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2536 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2537 julong long_ReservedCodeCacheSize = 0;
2538
2539 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2540 if (errcode != arg_in_range) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Invalid maximum code cache size: %s.\n", option->optionString);
2543 return JNI_EINVAL;
2544 }
2545 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2546 return JNI_EINVAL;
2547 }
2548 // -green
2549 } else if (match_option(option, "-green")) {
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Green threads support not available\n");
2552 return JNI_EINVAL;
2553 // -native
2554 } else if (match_option(option, "-native")) {
2555 // HotSpot always uses native threads, ignore silently for compatibility
2556 // -Xrs
2557 } else if (match_option(option, "-Xrs")) {
2558 // Classic/EVM option, new functionality
2559 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 // -Xprof
2563 } else if (match_option(option, "-Xprof")) {
2564 char version[256];
2565 // Obsolete in JDK 10
2566 JDK_Version::jdk(10).to_string(version, sizeof(version));
2567 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2568 // -Xinternalversion
2569 } else if (match_option(option, "-Xinternalversion")) {
2570 jio_fprintf(defaultStream::output_stream(), "%s\n",
2571 VM_Version::internal_vm_info_string());
2572 vm_exit(0);
2573 #ifndef PRODUCT
2574 // -Xprintflags
2575 } else if (match_option(option, "-Xprintflags")) {
2576 JVMFlag::printFlags(tty, false);
2577 vm_exit(0);
2578 #endif
2579 // -D
2580 } else if (match_option(option, "-D", &tail)) {
2581 const char* value;
2582 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2583 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2584 // abort if -Djava.endorsed.dirs is set
2585 jio_fprintf(defaultStream::output_stream(),
2586 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2587 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2588 return JNI_EINVAL;
2589 }
2590 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2591 *value != '\0' && strcmp(value, "\"\"") != 0) {
2592 // abort if -Djava.ext.dirs is set
2593 jio_fprintf(defaultStream::output_stream(),
2594 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2595 return JNI_EINVAL;
2596 }
2597 // Check for module related properties. They must be set using the modules
2598 // options. For example: use "--add-modules=java.sql", not
2599 // "-Djdk.module.addmods=java.sql"
2600 if (is_internal_module_property(option->optionString + 2)) {
2601 needs_module_property_warning = true;
2602 continue;
2603 }
2604 if (!add_property(tail)) {
2605 return JNI_ENOMEM;
2606 }
2607 // Out of the box management support
2608 if (match_option(option, "-Dcom.sun.management", &tail)) {
2609 #if INCLUDE_MANAGEMENT
2610 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2611 return JNI_EINVAL;
2612 }
2613 // management agent in module jdk.management.agent
2614 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2615 return JNI_ENOMEM;
2616 }
2617 #else
2618 jio_fprintf(defaultStream::output_stream(),
2619 "-Dcom.sun.management is not supported in this VM.\n");
2620 return JNI_ERR;
2621 #endif
2622 }
2623 // -Xint
2624 } else if (match_option(option, "-Xint")) {
2625 set_mode_flags(_int);
2626 // -Xmixed
2627 } else if (match_option(option, "-Xmixed")) {
2628 set_mode_flags(_mixed);
2629 // -Xcomp
2630 } else if (match_option(option, "-Xcomp")) {
2631 // for testing the compiler; turn off all flags that inhibit compilation
2632 set_mode_flags(_comp);
2633 // -Xshare:dump
2634 } else if (match_option(option, "-Xshare:dump")) {
2635 DumpSharedSpaces = true;
2636 // -Xshare:on
2637 } else if (match_option(option, "-Xshare:on")) {
2638 UseSharedSpaces = true;
2639 RequireSharedSpaces = true;
2640 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2641 } else if (match_option(option, "-Xshare:auto")) {
2642 UseSharedSpaces = true;
2643 RequireSharedSpaces = false;
2644 xshare_auto_cmd_line = true;
2645 // -Xshare:off
2646 } else if (match_option(option, "-Xshare:off")) {
2647 UseSharedSpaces = false;
2648 RequireSharedSpaces = false;
2649 // -Xverify
2650 } else if (match_option(option, "-Xverify", &tail)) {
2651 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2652 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 } else if (strcmp(tail, ":remote") == 0) {
2659 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 } else if (strcmp(tail, ":none") == 0) {
2666 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2673 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2674 return JNI_EINVAL;
2675 }
2676 // -Xdebug
2677 } else if (match_option(option, "-Xdebug")) {
2678 // note this flag has been used, then ignore
2679 set_xdebug_mode(true);
2680 // -Xnoagent
2681 } else if (match_option(option, "-Xnoagent")) {
2682 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2683 } else if (match_option(option, "-Xloggc:", &tail)) {
2684 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2685 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2686 _legacyGCLogging.lastFlag = 2;
2687 _legacyGCLogging.file = os::strdup_check_oom(tail);
2688 } else if (match_option(option, "-Xlog", &tail)) {
2689 bool ret = false;
2690 if (strcmp(tail, ":help") == 0) {
2691 fileStream stream(defaultStream::output_stream());
2692 LogConfiguration::print_command_line_help(&stream);
2693 vm_exit(0);
2694 } else if (strcmp(tail, ":disable") == 0) {
2695 LogConfiguration::disable_logging();
2696 ret = true;
2697 } else if (strcmp(tail, ":async") == 0) {
2698 LogConfiguration::set_async_mode(true);
2699 ret = true;
2700 } else if (*tail == '\0') {
2701 ret = LogConfiguration::parse_command_line_arguments();
2702 assert(ret, "-Xlog without arguments should never fail to parse");
2703 } else if (*tail == ':') {
2704 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2705 }
2706 if (ret == false) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2709 tail);
2710 return JNI_EINVAL;
2711 }
2712 // JNI hooks
2713 } else if (match_option(option, "-Xcheck", &tail)) {
2714 if (!strcmp(tail, ":jni")) {
2715 #if !INCLUDE_JNI_CHECK
2716 warning("JNI CHECKING is not supported in this VM");
2717 #else
2718 CheckJNICalls = true;
2719 #endif // INCLUDE_JNI_CHECK
2720 } else if (is_bad_option(option, args->ignoreUnrecognized,
2721 "check")) {
2722 return JNI_EINVAL;
2723 }
2724 } else if (match_option(option, "vfprintf")) {
2725 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2726 } else if (match_option(option, "exit")) {
2727 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2728 } else if (match_option(option, "abort")) {
2729 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2730 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2731 // and the last option wins.
2732 } else if (match_option(option, "-XX:+NeverTenure")) {
2733 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2743 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2753 uintx max_tenuring_thresh = 0;
2754 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2757 return JNI_EINVAL;
2758 }
2759
2760 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763
2764 if (MaxTenuringThreshold == 0) {
2765 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 } else {
2772 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 }
2779 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2780 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2787 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2794 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2795 return JNI_EINVAL;
2796 }
2797 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2801 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2805 return JNI_EINVAL;
2806 }
2807 } else if (match_option(option, "--finalization=", &tail)) {
2808 if (strcmp(tail, "enabled") == 0) {
2809 InstanceKlass::set_finalization_enabled(true);
2810 } else if (strcmp(tail, "disabled") == 0) {
2811 InstanceKlass::set_finalization_enabled(false);
2812 } else {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2815 tail);
2816 return JNI_EINVAL;
2817 }
2818 #if !defined(DTRACE_ENABLED)
2819 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "DTraceMethodProbes flag is not applicable for this configuration\n");
2822 return JNI_EINVAL;
2823 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2824 jio_fprintf(defaultStream::error_stream(),
2825 "DTraceAllocProbes flag is not applicable for this configuration\n");
2826 return JNI_EINVAL;
2827 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2830 return JNI_EINVAL;
2831 #endif // !defined(DTRACE_ENABLED)
2832 #ifdef ASSERT
2833 } else if (match_option(option, "-XX:+FullGCALot")) {
2834 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 // disable scavenge before parallel mark-compact
2838 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 #endif
2842 #if !INCLUDE_MANAGEMENT
2843 } else if (match_option(option, "-XX:+ManagementServer")) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "ManagementServer is not supported in this VM.\n");
2846 return JNI_ERR;
2847 #endif // INCLUDE_MANAGEMENT
2848 #if INCLUDE_JVMCI
2849 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2850 if (EnableJVMCIProduct) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2853 return JNI_EINVAL;
2854 }
2855 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
2856 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
2857 if (EnableJVMCIProduct) {
2858 continue;
2859 }
2860 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2861 // Allow this flag if it has been unlocked.
2862 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
2863 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Unable to enable JVMCI in product mode");
2866 return JNI_ERR;
2867 }
2868 }
2869 // The flag was locked so process normally to report that error
2870 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2871 return JNI_EINVAL;
2872 }
2873 #endif // INCLUDE_JVMCI
2874 #if INCLUDE_JFR
2875 } else if (match_jfr_option(&option)) {
2876 return JNI_EINVAL;
2877 #endif
2878 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2879 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2880 // already been handled
2881 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2882 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2883 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2884 return JNI_EINVAL;
2885 }
2886 }
2887 // Unknown option
2888 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2889 return JNI_ERR;
2890 }
2891 }
2892
2893 // PrintSharedArchiveAndExit will turn on
2894 // -Xshare:on
2895 // -Xlog:class+path=info
2896 if (PrintSharedArchiveAndExit) {
2897 UseSharedSpaces = true;
2898 RequireSharedSpaces = true;
2899 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2900 }
2901
2902 fix_appclasspath();
2903
2904 return JNI_OK;
2905 }
2906
2907 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2908 // For java.base check for duplicate --patch-module options being specified on the command line.
2909 // This check is only required for java.base, all other duplicate module specifications
2910 // will be checked during module system initialization. The module system initialization
2911 // will throw an ExceptionInInitializerError if this situation occurs.
2912 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2913 if (*patch_mod_javabase) {
2914 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2915 } else {
2916 *patch_mod_javabase = true;
2917 }
2918 }
2919
2920 // Create GrowableArray lazily, only if --patch-module has been specified
2921 if (_patch_mod_prefix == NULL) {
2922 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2923 }
2924
2925 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2926 }
2927
2928 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2929 //
2930 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2931 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2932 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2933 // path is treated as the current directory.
2934 //
2935 // This causes problems with CDS, which requires that all directories specified in the classpath
2936 // must be empty. In most cases, applications do NOT want to load classes from the current
2937 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2938 // scripts compatible with CDS.
2939 void Arguments::fix_appclasspath() {
2940 if (IgnoreEmptyClassPaths) {
2941 const char separator = *os::path_separator();
2942 const char* src = _java_class_path->value();
2943
2944 // skip over all the leading empty paths
2945 while (*src == separator) {
2946 src ++;
2947 }
2948
2949 char* copy = os::strdup_check_oom(src, mtArguments);
2950
2951 // trim all trailing empty paths
2952 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2953 *tail = '\0';
2954 }
2955
2956 char from[3] = {separator, separator, '\0'};
2957 char to [2] = {separator, '\0'};
2958 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2959 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2960 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2961 }
2962
2963 _java_class_path->set_writeable_value(copy);
2964 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2965 }
2966 }
2967
2968 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2969 // check if the default lib/endorsed directory exists; if so, error
2970 char path[JVM_MAXPATHLEN];
2971 const char* fileSep = os::file_separator();
2972 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2973
2974 DIR* dir = os::opendir(path);
2975 if (dir != NULL) {
2976 jio_fprintf(defaultStream::output_stream(),
2977 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2978 "in modular form will be supported via the concept of upgradeable modules.\n");
2979 os::closedir(dir);
2980 return JNI_ERR;
2981 }
2982
2983 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2984 dir = os::opendir(path);
2985 if (dir != NULL) {
2986 jio_fprintf(defaultStream::output_stream(),
2987 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2988 "Use -classpath instead.\n.");
2989 os::closedir(dir);
2990 return JNI_ERR;
2991 }
2992
2993 // This must be done after all arguments have been processed
2994 // and the container support has been initialized since AggressiveHeap
2995 // relies on the amount of total memory available.
2996 if (AggressiveHeap) {
2997 jint result = set_aggressive_heap_flags();
2998 if (result != JNI_OK) {
2999 return result;
3000 }
3001 }
3002
3003 // This must be done after all arguments have been processed.
3004 // java_compiler() true means set to "NONE" or empty.
3005 if (java_compiler() && !xdebug_mode()) {
3006 // For backwards compatibility, we switch to interpreted mode if
3007 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3008 // not specified.
3009 set_mode_flags(_int);
3010 }
3011
3012 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3013 // but like -Xint, leave compilation thresholds unaffected.
3014 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3015 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3016 set_mode_flags(_int);
3017 }
3018
3019 #ifdef ZERO
3020 // Zero always runs in interpreted mode
3021 set_mode_flags(_int);
3022 #endif
3023
3024 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3025 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3026 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3027 }
3028
3029 #if !COMPILER2_OR_JVMCI
3030 // Don't degrade server performance for footprint
3031 if (FLAG_IS_DEFAULT(UseLargePages) &&
3032 MaxHeapSize < LargePageHeapSizeThreshold) {
3033 // No need for large granularity pages w/small heaps.
3034 // Note that large pages are enabled/disabled for both the
3035 // Java heap and the code cache.
3036 FLAG_SET_DEFAULT(UseLargePages, false);
3037 }
3038
3039 UNSUPPORTED_OPTION(ProfileInterpreter);
3040 #endif
3041
3042 // Parse the CompilationMode flag
3043 if (!CompilationModeFlag::initialize()) {
3044 return JNI_ERR;
3045 }
3046
3047 if (!check_vm_args_consistency()) {
3048 return JNI_ERR;
3049 }
3050
3051 #if INCLUDE_CDS
3052 if (DumpSharedSpaces) {
3053 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3054 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3055 // compiler just to be safe.
3056 //
3057 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3058 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3059 // TODO: revisit the following for the static archive case.
3060 set_mode_flags(_int);
3061 }
3062
3063 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3064 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) {
3065 jio_fprintf(defaultStream::output_stream(),
3066 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3067 return JNI_ERR;
3068 }
3069
3070 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) {
3071 DynamicDumpSharedSpaces = false;
3072 } else {
3073 DynamicDumpSharedSpaces = true;
3074 }
3075
3076 if (AutoCreateSharedArchive) {
3077 if (SharedArchiveFile == NULL) {
3078 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3079 return JNI_ERR;
3080 }
3081 if (ArchiveClassesAtExit != NULL) {
3082 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3083 return JNI_ERR;
3084 }
3085 }
3086
3087 if (UseSharedSpaces && patch_mod_javabase) {
3088 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3089 }
3090 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3091 UseSharedSpaces = false;
3092 }
3093
3094 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3095 // Always verify non-system classes during CDS dump
3096 if (!BytecodeVerificationRemote) {
3097 BytecodeVerificationRemote = true;
3098 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3099 }
3100 }
3101 #endif
3102
3103 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3104 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3105 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3106
3107 // Lilliput requires fast-locking.
3108 FLAG_SET_DEFAULT(UseFastLocking, true);
3109
3110 return JNI_OK;
3111 }
3112
3113 // Helper class for controlling the lifetime of JavaVMInitArgs
3114 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3115 // deleted on the destruction of the ScopedVMInitArgs object.
3116 class ScopedVMInitArgs : public StackObj {
3117 private:
3118 JavaVMInitArgs _args;
3119 char* _container_name;
3120 bool _is_set;
3121 char* _vm_options_file_arg;
3122
3123 public:
3124 ScopedVMInitArgs(const char *container_name) {
3125 _args.version = JNI_VERSION_1_2;
3126 _args.nOptions = 0;
3127 _args.options = NULL;
3128 _args.ignoreUnrecognized = false;
3129 _container_name = (char *)container_name;
3130 _is_set = false;
3131 _vm_options_file_arg = NULL;
3132 }
3133
3134 // Populates the JavaVMInitArgs object represented by this
3135 // ScopedVMInitArgs object with the arguments in options. The
3136 // allocated memory is deleted by the destructor. If this method
3137 // returns anything other than JNI_OK, then this object is in a
3138 // partially constructed state, and should be abandoned.
3139 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3140 _is_set = true;
3141 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3142 JavaVMOption, options->length(), mtArguments);
3143 if (options_arr == NULL) {
3144 return JNI_ENOMEM;
3145 }
3146 _args.options = options_arr;
3147
3148 for (int i = 0; i < options->length(); i++) {
3149 options_arr[i] = options->at(i);
3150 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3151 if (options_arr[i].optionString == NULL) {
3152 // Rely on the destructor to do cleanup.
3153 _args.nOptions = i;
3154 return JNI_ENOMEM;
3155 }
3156 }
3157
3158 _args.nOptions = options->length();
3159 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3160 return JNI_OK;
3161 }
3162
3163 JavaVMInitArgs* get() { return &_args; }
3164 char* container_name() { return _container_name; }
3165 bool is_set() { return _is_set; }
3166 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3167 char* vm_options_file_arg() { return _vm_options_file_arg; }
3168
3169 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3170 if (_vm_options_file_arg != NULL) {
3171 os::free(_vm_options_file_arg);
3172 }
3173 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3174 }
3175
3176 ~ScopedVMInitArgs() {
3177 if (_vm_options_file_arg != NULL) {
3178 os::free(_vm_options_file_arg);
3179 }
3180 if (_args.options == NULL) return;
3181 for (int i = 0; i < _args.nOptions; i++) {
3182 os::free(_args.options[i].optionString);
3183 }
3184 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3185 }
3186
3187 // Insert options into this option list, to replace option at
3188 // vm_options_file_pos (-XX:VMOptionsFile)
3189 jint insert(const JavaVMInitArgs* args,
3190 const JavaVMInitArgs* args_to_insert,
3191 const int vm_options_file_pos) {
3192 assert(_args.options == NULL, "shouldn't be set yet");
3193 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3194 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3195
3196 int length = args->nOptions + args_to_insert->nOptions - 1;
3197 // Construct new option array
3198 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3199 for (int i = 0; i < args->nOptions; i++) {
3200 if (i == vm_options_file_pos) {
3201 // insert the new options starting at the same place as the
3202 // -XX:VMOptionsFile option
3203 for (int j = 0; j < args_to_insert->nOptions; j++) {
3204 options.push(args_to_insert->options[j]);
3205 }
3206 } else {
3207 options.push(args->options[i]);
3208 }
3209 }
3210 // make into options array
3211 return set_args(&options);
3212 }
3213 };
3214
3215 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3216 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3217 }
3218
3219 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3220 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3221 }
3222
3223 jint Arguments::parse_options_environment_variable(const char* name,
3224 ScopedVMInitArgs* vm_args) {
3225 char *buffer = ::getenv(name);
3226
3227 // Don't check this environment variable if user has special privileges
3228 // (e.g. unix su command).
3229 if (buffer == NULL || os::have_special_privileges()) {
3230 return JNI_OK;
3231 }
3232
3233 if ((buffer = os::strdup(buffer)) == NULL) {
3234 return JNI_ENOMEM;
3235 }
3236
3237 jio_fprintf(defaultStream::error_stream(),
3238 "Picked up %s: %s\n", name, buffer);
3239
3240 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3241
3242 os::free(buffer);
3243 return retcode;
3244 }
3245
3246 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3247 // read file into buffer
3248 int fd = ::open(file_name, O_RDONLY);
3249 if (fd < 0) {
3250 jio_fprintf(defaultStream::error_stream(),
3251 "Could not open options file '%s'\n",
3252 file_name);
3253 return JNI_ERR;
3254 }
3255
3256 struct stat stbuf;
3257 int retcode = os::stat(file_name, &stbuf);
3258 if (retcode != 0) {
3259 jio_fprintf(defaultStream::error_stream(),
3260 "Could not stat options file '%s'\n",
3261 file_name);
3262 ::close(fd);
3263 return JNI_ERR;
3264 }
3265
3266 if (stbuf.st_size == 0) {
3267 // tell caller there is no option data and that is ok
3268 ::close(fd);
3269 return JNI_OK;
3270 }
3271
3272 // '+ 1' for NULL termination even with max bytes
3273 size_t bytes_alloc = stbuf.st_size + 1;
3274
3275 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3276 if (NULL == buf) {
3277 jio_fprintf(defaultStream::error_stream(),
3278 "Could not allocate read buffer for options file parse\n");
3279 ::close(fd);
3280 return JNI_ENOMEM;
3281 }
3282
3283 memset(buf, 0, bytes_alloc);
3284
3285 // Fill buffer
3286 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3287 ::close(fd);
3288 if (bytes_read < 0) {
3289 FREE_C_HEAP_ARRAY(char, buf);
3290 jio_fprintf(defaultStream::error_stream(),
3291 "Could not read options file '%s'\n", file_name);
3292 return JNI_ERR;
3293 }
3294
3295 if (bytes_read == 0) {
3296 // tell caller there is no option data and that is ok
3297 FREE_C_HEAP_ARRAY(char, buf);
3298 return JNI_OK;
3299 }
3300
3301 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3302
3303 FREE_C_HEAP_ARRAY(char, buf);
3304 return retcode;
3305 }
3306
3307 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3308 // Construct option array
3309 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3310
3311 // some pointers to help with parsing
3312 char *buffer_end = buffer + buf_len;
3313 char *opt_hd = buffer;
3314 char *wrt = buffer;
3315 char *rd = buffer;
3316
3317 // parse all options
3318 while (rd < buffer_end) {
3319 // skip leading white space from the input string
3320 while (rd < buffer_end && isspace(*rd)) {
3321 rd++;
3322 }
3323
3324 if (rd >= buffer_end) {
3325 break;
3326 }
3327
3328 // Remember this is where we found the head of the token.
3329 opt_hd = wrt;
3330
3331 // Tokens are strings of non white space characters separated
3332 // by one or more white spaces.
3333 while (rd < buffer_end && !isspace(*rd)) {
3334 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3335 int quote = *rd; // matching quote to look for
3336 rd++; // don't copy open quote
3337 while (rd < buffer_end && *rd != quote) {
3338 // include everything (even spaces)
3339 // up until the close quote
3340 *wrt++ = *rd++; // copy to option string
3341 }
3342
3343 if (rd < buffer_end) {
3344 rd++; // don't copy close quote
3345 } else {
3346 // did not see closing quote
3347 jio_fprintf(defaultStream::error_stream(),
3348 "Unmatched quote in %s\n", name);
3349 return JNI_ERR;
3350 }
3351 } else {
3352 *wrt++ = *rd++; // copy to option string
3353 }
3354 }
3355
3356 // steal a white space character and set it to NULL
3357 *wrt++ = '\0';
3358 // We now have a complete token
3359
3360 JavaVMOption option;
3361 option.optionString = opt_hd;
3362 option.extraInfo = NULL;
3363
3364 options.append(option); // Fill in option
3365
3366 rd++; // Advance to next character
3367 }
3368
3369 // Fill out JavaVMInitArgs structure.
3370 return vm_args->set_args(&options);
3371 }
3372
3373 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3374 if (DumpSharedSpaces) {
3375 if (RequireSharedSpaces) {
3376 warning("Cannot dump shared archive while using shared archive");
3377 }
3378 UseSharedSpaces = false;
3379 }
3380 #if INCLUDE_CDS
3381 // Initialize shared archive paths which could include both base and dynamic archive paths
3382 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3383 //
3384 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3385 if (DumpSharedSpaces || UseSharedSpaces) {
3386 init_shared_archive_paths();
3387 }
3388 #endif // INCLUDE_CDS
3389 }
3390
3391 #if INCLUDE_CDS
3392 // Sharing support
3393 // Construct the path to the archive
3394 char* Arguments::get_default_shared_archive_path() {
3395 char *default_archive_path;
3396 char jvm_path[JVM_MAXPATHLEN];
3397 os::jvm_path(jvm_path, sizeof(jvm_path));
3398 char *end = strrchr(jvm_path, *os::file_separator());
3399 if (end != NULL) *end = '\0';
3400 size_t jvm_path_len = strlen(jvm_path);
3401 size_t file_sep_len = strlen(os::file_separator());
3402 const size_t len = jvm_path_len + file_sep_len + 20;
3403 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3404 jio_snprintf(default_archive_path, len,
3405 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3406 jvm_path, os::file_separator());
3407 return default_archive_path;
3408 }
3409
3410 int Arguments::num_archives(const char* archive_path) {
3411 if (archive_path == NULL) {
3412 return 0;
3413 }
3414 int npaths = 1;
3415 char* p = (char*)archive_path;
3416 while (*p != '\0') {
3417 if (*p == os::path_separator()[0]) {
3418 npaths++;
3419 }
3420 p++;
3421 }
3422 return npaths;
3423 }
3424
3425 void Arguments::extract_shared_archive_paths(const char* archive_path,
3426 char** base_archive_path,
3427 char** top_archive_path) {
3428 char* begin_ptr = (char*)archive_path;
3429 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3430 if (end_ptr == NULL || end_ptr == begin_ptr) {
3431 vm_exit_during_initialization("Base archive was not specified", archive_path);
3432 }
3433 size_t len = end_ptr - begin_ptr;
3434 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3435 strncpy(cur_path, begin_ptr, len);
3436 cur_path[len] = '\0';
3437 *base_archive_path = cur_path;
3438
3439 begin_ptr = ++end_ptr;
3440 if (*begin_ptr == '\0') {
3441 vm_exit_during_initialization("Top archive was not specified", archive_path);
3442 }
3443 end_ptr = strchr(begin_ptr, '\0');
3444 assert(end_ptr != NULL, "sanity");
3445 len = end_ptr - begin_ptr;
3446 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3447 strncpy(cur_path, begin_ptr, len + 1);
3448 *top_archive_path = cur_path;
3449 }
3450
3451 void Arguments::init_shared_archive_paths() {
3452 if (ArchiveClassesAtExit != nullptr) {
3453 assert(!RecordDynamicDumpInfo, "already checked");
3454 if (DumpSharedSpaces) {
3455 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3456 }
3457 check_unsupported_dumping_properties();
3458
3459 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3460 vm_exit_during_initialization(
3461 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3462 }
3463 }
3464
3465 if (SharedArchiveFile == nullptr) {
3466 SharedArchivePath = get_default_shared_archive_path();
3467 } else {
3468 int archives = num_archives(SharedArchiveFile);
3469 assert(archives > 0, "must be");
3470
3471 if (is_dumping_archive() && archives > 1) {
3472 vm_exit_during_initialization(
3473 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3474 }
3475
3476 if (DumpSharedSpaces) {
3477 assert(archives == 1, "must be");
3478 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3479 // will be overwritten no matter regardless of its contents
3480 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3481 } else {
3482 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3483 // is read from top.jsa
3484 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3485 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3486 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3487 //
3488 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3489 // allow cases (b) and (c). Case (b) is already checked above.
3490
3491 if (archives > 2) {
3492 vm_exit_during_initialization(
3493 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3494 }
3495 if (archives == 1) {
3496 char* base_archive_path = NULL;
3497 bool success =
3498 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3499 if (!success) {
3500 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3501 // regenerate the dynamic archive base on default archive.
3502 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3503 DynamicDumpSharedSpaces = true;
3504 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3505 SharedArchivePath = get_default_shared_archive_path();
3506 SharedArchiveFile = nullptr;
3507 } else {
3508 if (AutoCreateSharedArchive) {
3509 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3510 AutoCreateSharedArchive = false;
3511 }
3512 no_shared_spaces("invalid archive");
3513 }
3514 } else if (base_archive_path == NULL) {
3515 // User has specified a single archive, which is a static archive.
3516 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3517 } else {
3518 // User has specified a single archive, which is a dynamic archive.
3519 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3520 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3521 }
3522 } else {
3523 extract_shared_archive_paths((const char*)SharedArchiveFile,
3524 &SharedArchivePath, &SharedDynamicArchivePath);
3525 if (SharedArchivePath == NULL) {
3526 assert(SharedDynamicArchivePath == NULL, "must be");
3527 no_shared_spaces("invalid archive");
3528 }
3529 }
3530
3531 if (SharedDynamicArchivePath != nullptr) {
3532 // Check for case (c)
3533 if (RecordDynamicDumpInfo) {
3534 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3535 SharedArchiveFile);
3536 }
3537 if (ArchiveClassesAtExit != nullptr) {
3538 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3539 SharedArchiveFile);
3540 }
3541 }
3542
3543 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3544 vm_exit_during_initialization(
3545 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3546 SharedArchiveFile);
3547 }
3548 }
3549 }
3550 }
3551 #endif // INCLUDE_CDS
3552
3553 #ifndef PRODUCT
3554 // Determine whether LogVMOutput should be implicitly turned on.
3555 static bool use_vm_log() {
3556 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3557 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3558 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3559 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3560 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3561 return true;
3562 }
3563
3564 #ifdef COMPILER1
3565 if (PrintC1Statistics) {
3566 return true;
3567 }
3568 #endif // COMPILER1
3569
3570 #ifdef COMPILER2
3571 if (PrintOptoAssembly || PrintOptoStatistics) {
3572 return true;
3573 }
3574 #endif // COMPILER2
3575
3576 return false;
3577 }
3578
3579 #endif // PRODUCT
3580
3581 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3582 for (int index = 0; index < args->nOptions; index++) {
3583 const JavaVMOption* option = args->options + index;
3584 const char* tail;
3585 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3586 return true;
3587 }
3588 }
3589 return false;
3590 }
3591
3592 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3593 const char* vm_options_file,
3594 const int vm_options_file_pos,
3595 ScopedVMInitArgs* vm_options_file_args,
3596 ScopedVMInitArgs* args_out) {
3597 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3598 if (code != JNI_OK) {
3599 return code;
3600 }
3601
3602 if (vm_options_file_args->get()->nOptions < 1) {
3603 return JNI_OK;
3604 }
3605
3606 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3607 jio_fprintf(defaultStream::error_stream(),
3608 "A VM options file may not refer to a VM options file. "
3609 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3610 "options file '%s' in options container '%s' is an error.\n",
3611 vm_options_file_args->vm_options_file_arg(),
3612 vm_options_file_args->container_name());
3613 return JNI_EINVAL;
3614 }
3615
3616 return args_out->insert(args, vm_options_file_args->get(),
3617 vm_options_file_pos);
3618 }
3619
3620 // Expand -XX:VMOptionsFile found in args_in as needed.
3621 // mod_args and args_out parameters may return values as needed.
3622 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3623 ScopedVMInitArgs* mod_args,
3624 JavaVMInitArgs** args_out) {
3625 jint code = match_special_option_and_act(args_in, mod_args);
3626 if (code != JNI_OK) {
3627 return code;
3628 }
3629
3630 if (mod_args->is_set()) {
3631 // args_in contains -XX:VMOptionsFile and mod_args contains the
3632 // original options from args_in along with the options expanded
3633 // from the VMOptionsFile. Return a short-hand to the caller.
3634 *args_out = mod_args->get();
3635 } else {
3636 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3637 }
3638 return JNI_OK;
3639 }
3640
3641 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3642 ScopedVMInitArgs* args_out) {
3643 // Remaining part of option string
3644 const char* tail;
3645 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3646
3647 for (int index = 0; index < args->nOptions; index++) {
3648 const JavaVMOption* option = args->options + index;
3649 if (match_option(option, "-XX:Flags=", &tail)) {
3650 Arguments::set_jvm_flags_file(tail);
3651 continue;
3652 }
3653 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3654 if (vm_options_file_args.found_vm_options_file_arg()) {
3655 jio_fprintf(defaultStream::error_stream(),
3656 "The option '%s' is already specified in the options "
3657 "container '%s' so the specification of '%s' in the "
3658 "same options container is an error.\n",
3659 vm_options_file_args.vm_options_file_arg(),
3660 vm_options_file_args.container_name(),
3661 option->optionString);
3662 return JNI_EINVAL;
3663 }
3664 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3665 // If there's a VMOptionsFile, parse that
3666 jint code = insert_vm_options_file(args, tail, index,
3667 &vm_options_file_args, args_out);
3668 if (code != JNI_OK) {
3669 return code;
3670 }
3671 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3672 if (args_out->is_set()) {
3673 // The VMOptions file inserted some options so switch 'args'
3674 // to the new set of options, and continue processing which
3675 // preserves "last option wins" semantics.
3676 args = args_out->get();
3677 // The first option from the VMOptionsFile replaces the
3678 // current option. So we back track to process the
3679 // replacement option.
3680 index--;
3681 }
3682 continue;
3683 }
3684 if (match_option(option, "-XX:+PrintVMOptions")) {
3685 PrintVMOptions = true;
3686 continue;
3687 }
3688 if (match_option(option, "-XX:-PrintVMOptions")) {
3689 PrintVMOptions = false;
3690 continue;
3691 }
3692 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3693 IgnoreUnrecognizedVMOptions = true;
3694 continue;
3695 }
3696 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3697 IgnoreUnrecognizedVMOptions = false;
3698 continue;
3699 }
3700 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3701 JVMFlag::printFlags(tty, false);
3702 vm_exit(0);
3703 }
3704
3705 #ifndef PRODUCT
3706 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3707 JVMFlag::printFlags(tty, true);
3708 vm_exit(0);
3709 }
3710 #endif
3711 }
3712 return JNI_OK;
3713 }
3714
3715 static void print_options(const JavaVMInitArgs *args) {
3716 const char* tail;
3717 for (int index = 0; index < args->nOptions; index++) {
3718 const JavaVMOption *option = args->options + index;
3719 if (match_option(option, "-XX:", &tail)) {
3720 logOption(tail);
3721 }
3722 }
3723 }
3724
3725 bool Arguments::handle_deprecated_print_gc_flags() {
3726 if (PrintGC) {
3727 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3728 }
3729 if (PrintGCDetails) {
3730 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3731 }
3732
3733 if (_legacyGCLogging.lastFlag == 2) {
3734 // -Xloggc was used to specify a filename
3735 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3736
3737 LogTarget(Error, logging) target;
3738 LogStream errstream(target);
3739 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream);
3740 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3741 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3742 }
3743 return true;
3744 }
3745
3746 static void apply_debugger_ergo() {
3747 #ifndef PRODUCT
3748 // UseDebuggerErgo is notproduct
3749 if (ReplayCompiles) {
3750 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3751 }
3752 #endif
3753
3754 #ifndef PRODUCT
3755 if (UseDebuggerErgo) {
3756 // Turn on sub-flags
3757 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3758 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3759 }
3760 #endif
3761
3762 if (UseDebuggerErgo2) {
3763 // Debugging with limited number of CPUs
3764 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3765 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3766 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3767 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3768 }
3769 }
3770
3771 // Parse entry point called from JNI_CreateJavaVM
3772
3773 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3774 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3775 JVMFlag::check_all_flag_declarations();
3776
3777 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3778 const char* hotspotrc = ".hotspotrc";
3779 bool settings_file_specified = false;
3780 bool needs_hotspotrc_warning = false;
3781 ScopedVMInitArgs initial_vm_options_args("");
3782 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3783 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3784
3785 // Pointers to current working set of containers
3786 JavaVMInitArgs* cur_cmd_args;
3787 JavaVMInitArgs* cur_vm_options_args;
3788 JavaVMInitArgs* cur_java_options_args;
3789 JavaVMInitArgs* cur_java_tool_options_args;
3790
3791 // Containers for modified/expanded options
3792 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3793 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3794 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3795 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3796
3797
3798 jint code =
3799 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3800 if (code != JNI_OK) {
3801 return code;
3802 }
3803
3804 code = parse_java_options_environment_variable(&initial_java_options_args);
3805 if (code != JNI_OK) {
3806 return code;
3807 }
3808
3809 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3810 char *vmoptions = ClassLoader::lookup_vm_options();
3811 if (vmoptions != NULL) {
3812 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3813 FREE_C_HEAP_ARRAY(char, vmoptions);
3814 if (code != JNI_OK) {
3815 return code;
3816 }
3817 }
3818
3819 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3820 &mod_java_tool_options_args,
3821 &cur_java_tool_options_args);
3822 if (code != JNI_OK) {
3823 return code;
3824 }
3825
3826 code = expand_vm_options_as_needed(initial_cmd_args,
3827 &mod_cmd_args,
3828 &cur_cmd_args);
3829 if (code != JNI_OK) {
3830 return code;
3831 }
3832
3833 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3834 &mod_java_options_args,
3835 &cur_java_options_args);
3836 if (code != JNI_OK) {
3837 return code;
3838 }
3839
3840 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3841 &mod_vm_options_args,
3842 &cur_vm_options_args);
3843 if (code != JNI_OK) {
3844 return code;
3845 }
3846
3847 const char* flags_file = Arguments::get_jvm_flags_file();
3848 settings_file_specified = (flags_file != NULL);
3849
3850 if (IgnoreUnrecognizedVMOptions) {
3851 cur_cmd_args->ignoreUnrecognized = true;
3852 cur_java_tool_options_args->ignoreUnrecognized = true;
3853 cur_java_options_args->ignoreUnrecognized = true;
3854 }
3855
3856 // Parse specified settings file
3857 if (settings_file_specified) {
3858 if (!process_settings_file(flags_file, true,
3859 cur_cmd_args->ignoreUnrecognized)) {
3860 return JNI_EINVAL;
3861 }
3862 } else {
3863 #ifdef ASSERT
3864 // Parse default .hotspotrc settings file
3865 if (!process_settings_file(".hotspotrc", false,
3866 cur_cmd_args->ignoreUnrecognized)) {
3867 return JNI_EINVAL;
3868 }
3869 #else
3870 struct stat buf;
3871 if (os::stat(hotspotrc, &buf) == 0) {
3872 needs_hotspotrc_warning = true;
3873 }
3874 #endif
3875 }
3876
3877 if (PrintVMOptions) {
3878 print_options(cur_java_tool_options_args);
3879 print_options(cur_cmd_args);
3880 print_options(cur_java_options_args);
3881 }
3882
3883 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3884 jint result = parse_vm_init_args(cur_vm_options_args,
3885 cur_java_tool_options_args,
3886 cur_java_options_args,
3887 cur_cmd_args);
3888
3889 if (result != JNI_OK) {
3890 return result;
3891 }
3892
3893 // Delay warning until here so that we've had a chance to process
3894 // the -XX:-PrintWarnings flag
3895 if (needs_hotspotrc_warning) {
3896 warning("%s file is present but has been ignored. "
3897 "Run with -XX:Flags=%s to load the file.",
3898 hotspotrc, hotspotrc);
3899 }
3900
3901 if (needs_module_property_warning) {
3902 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3903 " names that are reserved for internal use.");
3904 }
3905
3906 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3907 UNSUPPORTED_OPTION(UseLargePages);
3908 #endif
3909
3910 #if defined(AIX)
3911 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3912 #endif
3913
3914 #ifndef PRODUCT
3915 if (TraceBytecodesAt != 0) {
3916 TraceBytecodes = true;
3917 }
3918 if (CountCompiledCalls) {
3919 if (UseCounterDecay) {
3920 warning("UseCounterDecay disabled because CountCalls is set");
3921 UseCounterDecay = false;
3922 }
3923 }
3924 #endif // PRODUCT
3925
3926 if (ScavengeRootsInCode == 0) {
3927 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3928 warning("Forcing ScavengeRootsInCode non-zero");
3929 }
3930 ScavengeRootsInCode = 1;
3931 }
3932
3933 if (!handle_deprecated_print_gc_flags()) {
3934 return JNI_EINVAL;
3935 }
3936
3937 // Set object alignment values.
3938 set_object_alignment();
3939
3940 #if !INCLUDE_CDS
3941 if (DumpSharedSpaces || RequireSharedSpaces) {
3942 jio_fprintf(defaultStream::error_stream(),
3943 "Shared spaces are not supported in this VM\n");
3944 return JNI_ERR;
3945 }
3946 if (DumpLoadedClassList != NULL) {
3947 jio_fprintf(defaultStream::error_stream(),
3948 "DumpLoadedClassList is not supported in this VM\n");
3949 return JNI_ERR;
3950 }
3951 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3952 log_is_enabled(Info, cds)) {
3953 warning("Shared spaces are not supported in this VM");
3954 UseSharedSpaces = false;
3955 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3956 }
3957 no_shared_spaces("CDS Disabled");
3958 #endif // INCLUDE_CDS
3959
3960 // Verify NMT arguments
3961 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3962 if (lvl == NMT_unknown) {
3963 jio_fprintf(defaultStream::error_stream(),
3964 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3965 return JNI_ERR;
3966 }
3967 if (PrintNMTStatistics && lvl == NMT_off) {
3968 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3969 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3970 }
3971
3972 if (TraceDependencies && VerifyDependencies) {
3973 if (!FLAG_IS_DEFAULT(TraceDependencies)) {
3974 warning("TraceDependencies results may be inflated by VerifyDependencies");
3975 }
3976 }
3977
3978 apply_debugger_ergo();
3979
3980 if (log_is_enabled(Info, arguments)) {
3981 LogStream st(Log(arguments)::info());
3982 Arguments::print_on(&st);
3983 }
3984
3985 return JNI_OK;
3986 }
3987
3988 jint Arguments::apply_ergo() {
3989 // Set flags based on ergonomics.
3990 jint result = set_ergonomics_flags();
3991 if (result != JNI_OK) return result;
3992
3993 // Set heap size based on available physical memory
3994 set_heap_size();
3995
3996 GCConfig::arguments()->initialize();
3997
3998 set_shared_spaces_flags_and_archive_paths();
3999
4000 // Initialize Metaspace flags and alignments
4001 Metaspace::ergo_initialize();
4002
4003 if (!StringDedup::ergo_initialize()) {
4004 return JNI_EINVAL;
4005 }
4006
4007 // Set compiler flags after GC is selected and GC specific
4008 // flags (LoopStripMiningIter) are set.
4009 CompilerConfig::ergo_initialize();
4010
4011 // Set bytecode rewriting flags
4012 set_bytecode_flags();
4013
4014 // Set flags if aggressive optimization flags are enabled
4015 jint code = set_aggressive_opts_flags();
4016 if (code != JNI_OK) {
4017 return code;
4018 }
4019
4020 #ifdef ZERO
4021 // Clear flags not supported on zero.
4022 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4023 #endif // ZERO
4024
4025 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4026 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4027 DebugNonSafepoints = true;
4028 }
4029
4030 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4031 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4032 }
4033
4034 // Treat the odd case where local verification is enabled but remote
4035 // verification is not as if both were enabled.
4036 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4037 log_info(verification)("Turning on remote verification because local verification is on");
4038 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4039 }
4040
4041 #ifndef PRODUCT
4042 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4043 if (use_vm_log()) {
4044 LogVMOutput = true;
4045 }
4046 }
4047 #endif // PRODUCT
4048
4049 if (PrintCommandLineFlags) {
4050 JVMFlag::printSetFlags(tty);
4051 }
4052
4053 #ifdef COMPILER2
4054 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4055 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4056 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4057 }
4058 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4059
4060 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4061 if (!EnableVectorReboxing) {
4062 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4063 } else {
4064 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4065 }
4066 }
4067 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4068
4069 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4070 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4071 }
4072 FLAG_SET_DEFAULT(UseVectorStubs, false);
4073 }
4074 #endif // COMPILER2
4075
4076 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4077 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4078 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4079 }
4080 }
4081
4082 return JNI_OK;
4083 }
4084
4085 jint Arguments::adjust_after_os() {
4086 if (UseNUMA) {
4087 if (UseParallelGC) {
4088 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4089 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4090 }
4091 }
4092 }
4093 return JNI_OK;
4094 }
4095
4096 int Arguments::PropertyList_count(SystemProperty* pl) {
4097 int count = 0;
4098 while(pl != NULL) {
4099 count++;
4100 pl = pl->next();
4101 }
4102 return count;
4103 }
4104
4105 // Return the number of readable properties.
4106 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4107 int count = 0;
4108 while(pl != NULL) {
4109 if (pl->readable()) {
4110 count++;
4111 }
4112 pl = pl->next();
4113 }
4114 return count;
4115 }
4116
4117 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4118 assert(key != NULL, "just checking");
4119 SystemProperty* prop;
4120 for (prop = pl; prop != NULL; prop = prop->next()) {
4121 if (strcmp(key, prop->key()) == 0) return prop->value();
4122 }
4123 return NULL;
4124 }
4125
4126 // Return the value of the requested property provided that it is a readable property.
4127 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4128 assert(key != NULL, "just checking");
4129 SystemProperty* prop;
4130 // Return the property value if the keys match and the property is not internal or
4131 // it's the special internal property "jdk.boot.class.path.append".
4132 for (prop = pl; prop != NULL; prop = prop->next()) {
4133 if (strcmp(key, prop->key()) == 0) {
4134 if (!prop->internal()) {
4135 return prop->value();
4136 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4137 return prop->value();
4138 } else {
4139 // Property is internal and not jdk.boot.class.path.append so return NULL.
4140 return NULL;
4141 }
4142 }
4143 }
4144 return NULL;
4145 }
4146
4147 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4148 SystemProperty* p = *plist;
4149 if (p == NULL) {
4150 *plist = new_p;
4151 } else {
4152 while (p->next() != NULL) {
4153 p = p->next();
4154 }
4155 p->set_next(new_p);
4156 }
4157 }
4158
4159 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4160 bool writeable, bool internal) {
4161 if (plist == NULL)
4162 return;
4163
4164 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4165 PropertyList_add(plist, new_p);
4166 }
4167
4168 void Arguments::PropertyList_add(SystemProperty *element) {
4169 PropertyList_add(&_system_properties, element);
4170 }
4171
4172 // This add maintains unique property key in the list.
4173 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4174 PropertyAppendable append, PropertyWriteable writeable,
4175 PropertyInternal internal) {
4176 if (plist == NULL)
4177 return;
4178
4179 // If property key exists and is writeable, then update with new value.
4180 // Trying to update a non-writeable property is silently ignored.
4181 SystemProperty* prop;
4182 for (prop = *plist; prop != NULL; prop = prop->next()) {
4183 if (strcmp(k, prop->key()) == 0) {
4184 if (append == AppendProperty) {
4185 prop->append_writeable_value(v);
4186 } else {
4187 prop->set_writeable_value(v);
4188 }
4189 return;
4190 }
4191 }
4192
4193 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4194 }
4195
4196 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4197 // Returns true if all of the source pointed by src has been copied over to
4198 // the destination buffer pointed by buf. Otherwise, returns false.
4199 // Notes:
4200 // 1. If the length (buflen) of the destination buffer excluding the
4201 // NULL terminator character is not long enough for holding the expanded
4202 // pid characters, it also returns false instead of returning the partially
4203 // expanded one.
4204 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4205 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4206 char* buf, size_t buflen) {
4207 const char* p = src;
4208 char* b = buf;
4209 const char* src_end = &src[srclen];
4210 char* buf_end = &buf[buflen - 1];
4211
4212 while (p < src_end && b < buf_end) {
4213 if (*p == '%') {
4214 switch (*(++p)) {
4215 case '%': // "%%" ==> "%"
4216 *b++ = *p++;
4217 break;
4218 case 'p': { // "%p" ==> current process id
4219 // buf_end points to the character before the last character so
4220 // that we could write '\0' to the end of the buffer.
4221 size_t buf_sz = buf_end - b + 1;
4222 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4223
4224 // if jio_snprintf fails or the buffer is not long enough to hold
4225 // the expanded pid, returns false.
4226 if (ret < 0 || ret >= (int)buf_sz) {
4227 return false;
4228 } else {
4229 b += ret;
4230 assert(*b == '\0', "fail in copy_expand_pid");
4231 if (p == src_end && b == buf_end + 1) {
4232 // reach the end of the buffer.
4233 return true;
4234 }
4235 }
4236 p++;
4237 break;
4238 }
4239 default :
4240 *b++ = '%';
4241 }
4242 } else {
4243 *b++ = *p++;
4244 }
4245 }
4246 *b = '\0';
4247 return (p == src_end); // return false if not all of the source was copied
4248 }
4249
4250 bool Arguments::parse_malloc_limit_size(const char* s, size_t* out) {
4251 julong limit = 0;
4252 Arguments::ArgsRange range = parse_memory_size(s, &limit, 1, SIZE_MAX);
4253 switch (range) {
4254 case ArgsRange::arg_in_range:
4255 *out = (size_t)limit;
4256 return true;
4257 case ArgsRange::arg_too_big: // only possible on 32-bit
4258 vm_exit_during_initialization("MallocLimit: too large", s);
4259 break;
4260 case ArgsRange::arg_too_small:
4261 vm_exit_during_initialization("MallocLimit: limit must be > 0");
4262 break;
4263 default:
4264 break;
4265 }
4266 return false;
4267 }
4268
4269 // Helper for parse_malloc_limits
4270 void Arguments::parse_single_category_limit(char* expression, size_t limits[mt_number_of_types]) {
4271 // <category>:<limit>
4272 char* colon = ::strchr(expression, ':');
4273 if (colon == nullptr) {
4274 vm_exit_during_initialization("MallocLimit: colon missing", expression);
4275 }
4276 *colon = '\0';
4277 MEMFLAGS f = NMTUtil::string_to_flag(expression);
4278 if (f == mtNone) {
4279 vm_exit_during_initialization("MallocLimit: invalid nmt category", expression);
4280 }
4281 if (parse_malloc_limit_size(colon + 1, limits + (int)f) == false) {
4282 vm_exit_during_initialization("Invalid MallocLimit size", colon + 1);
4283 }
4284 }
4285
4286 void Arguments::parse_malloc_limits(size_t* total_limit, size_t limits[mt_number_of_types]) {
4287
4288 // Reset output to 0
4289 *total_limit = 0;
4290 for (int i = 0; i < mt_number_of_types; i ++) {
4291 limits[i] = 0;
4292 }
4293
4294 // We are done if the option is not given.
4295 if (MallocLimit == nullptr) {
4296 return;
4297 }
4298
4299 // Global form?
4300 if (parse_malloc_limit_size(MallocLimit, total_limit)) {
4301 return;
4302 }
4303
4304 // No. So it must be in category-specific form: MallocLimit=<nmt category>:<size>[,<nmt category>:<size> ..]
4305 char* copy = os::strdup(MallocLimit);
4306 if (copy == nullptr) {
4307 vm_exit_out_of_memory(strlen(MallocLimit), OOM_MALLOC_ERROR, "MallocLimit");
4308 }
4309
4310 char* p = copy, *q;
4311 do {
4312 q = p;
4313 p = ::strchr(q, ',');
4314 if (p != nullptr) {
4315 *p = '\0';
4316 p ++;
4317 }
4318 parse_single_category_limit(q, limits);
4319 } while (p != nullptr);
4320
4321 os::free(copy);
4322
4323 }