1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.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/genArguments.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/objLayout.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 #if INCLUDE_JVMCI
90 bool Arguments::_jvmci_module_added = false;
91 #endif
92 char* Arguments::_java_command = nullptr;
93 SystemProperty* Arguments::_system_properties = nullptr;
94 size_t Arguments::_conservative_max_heap_alignment = 0;
95 Arguments::Mode Arguments::_mode = _mixed;
96 const char* Arguments::_java_vendor_url_bug = nullptr;
97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
98 bool Arguments::_executing_unit_tests = false;
99
100 // These parameters are reset in method parse_vm_init_args()
101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
103 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
104 bool Arguments::_ClipInlining = ClipInlining;
105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
106
107 bool Arguments::_enable_preview = false;
108 bool Arguments::_has_jdwp_agent = false;
109
110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
111
112 // These are not set by the JDK's built-in launchers, but they can be set by
113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
114 // JavaVMOption in jni.h.
115 abort_hook_t Arguments::_abort_hook = nullptr;
116 exit_hook_t Arguments::_exit_hook = nullptr;
117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
118
119
120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
121 SystemProperty *Arguments::_java_library_path = nullptr;
122 SystemProperty *Arguments::_java_home = nullptr;
123 SystemProperty *Arguments::_java_class_path = nullptr;
124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
125 SystemProperty *Arguments::_vm_info = nullptr;
126
127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
128 PathString *Arguments::_boot_class_path = nullptr;
129 bool Arguments::_has_jimage = false;
130
131 char* Arguments::_ext_dirs = nullptr;
132
133 // True if -Xshare:auto option was specified.
134 static bool xshare_auto_cmd_line = false;
135
136 // True if -Xint/-Xmixed/-Xcomp were specified
137 static bool mode_flag_cmd_line = false;
138
139 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
140 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
141 if (new_value == nullptr) {
142 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
143 return false;
144 }
145 if (_value != nullptr) {
146 FreeHeap(_value);
147 }
148 _value = new_value;
149 strcpy(_value, value);
150 return true;
151 }
152
153 void PathString::append_value(const char *value) {
154 char *sp;
155 size_t len = 0;
156 if (value != nullptr) {
157 len = strlen(value);
158 if (_value != nullptr) {
159 len += strlen(_value);
160 }
161 sp = AllocateHeap(len+2, mtArguments);
162 assert(sp != nullptr, "Unable to allocate space for new append path value");
163 if (sp != nullptr) {
164 if (_value != nullptr) {
165 strcpy(sp, _value);
166 strcat(sp, os::path_separator());
167 strcat(sp, value);
168 FreeHeap(_value);
169 } else {
170 strcpy(sp, value);
171 }
172 _value = sp;
173 }
174 }
175 }
176
177 PathString::PathString(const char* value) {
178 if (value == nullptr) {
179 _value = nullptr;
180 } else {
181 _value = AllocateHeap(strlen(value)+1, mtArguments);
182 strcpy(_value, value);
183 }
184 }
185
186 PathString::~PathString() {
187 if (_value != nullptr) {
188 FreeHeap(_value);
189 _value = nullptr;
190 }
191 }
192
193 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
194 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
195 size_t len = strlen(module_name) + 1;
196 _module_name = AllocateHeap(len, mtInternal);
197 strncpy(_module_name, module_name, len); // copy the trailing null
198 _path = new PathString(path);
199 }
200
201 ModulePatchPath::~ModulePatchPath() {
202 if (_module_name != nullptr) {
203 FreeHeap(_module_name);
204 _module_name = nullptr;
205 }
206 if (_path != nullptr) {
207 delete _path;
208 _path = nullptr;
209 }
210 }
211
212 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
213 if (key == nullptr) {
214 _key = nullptr;
215 } else {
216 _key = AllocateHeap(strlen(key)+1, mtArguments);
217 strcpy(_key, key);
218 }
219 _next = nullptr;
220 _internal = internal;
221 _writeable = writeable;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = nullptr;
240 bool result = match_option(option, name, &tail);
241 if (tail != nullptr && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != nullptr; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != nullptr, "invariant");
269 char* tail = nullptr;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311 #define ENABLE_NATIVE_ACCESS "enable.native.access"
312 #define ENABLE_NATIVE_ACCESS_LEN 20
313 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
314 #define ILLEGAL_NATIVE_ACCESS_LEN 21
315
316 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
317 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
318 return ((strncmp(option, property, len) == 0) &&
319 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
320 }
321
322 // Return true if property starts with "jdk.module." and its ensuing chars match
323 // any of the reserved module properties.
324 // property should be passed without the leading "-D".
325 bool Arguments::is_internal_module_property(const char* property) {
326 return internal_module_property_helper(property, false);
327 }
328
329 // Returns true if property is one of those recognized by is_internal_module_property() but
330 // is not supported by CDS archived full module graph.
331 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
332 return internal_module_property_helper(property, true);
333 }
334
335 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
336 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
337 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
338 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
339 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
340 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
341 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
342 return true;
343 }
344
345 if (!check_for_cds) {
346 // CDS notes: these properties are supported by CDS archived full module graph.
347 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
350 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
351 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
352 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
353 return true;
354 }
355 }
356 }
357 return false;
358 }
359
360 // Process java launcher properties.
361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
362 // See if sun.java.launcher is defined.
363 // Must do this before setting up other system properties,
364 // as some of them may depend on launcher type.
365 for (int index = 0; index < args->nOptions; index++) {
366 const JavaVMOption* option = args->options + index;
367 const char* tail;
368
369 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
370 process_java_launcher_argument(tail, option->extraInfo);
371 continue;
372 }
373 if (match_option(option, "-XX:+ExecutingUnitTests")) {
374 _executing_unit_tests = true;
375 continue;
376 }
377 }
378 }
379
380 // Initialize system properties key and value.
381 void Arguments::init_system_properties() {
382
383 // Set up _boot_class_path which is not a property but
384 // relies heavily on argument processing and the jdk.boot.class.path.append
385 // property. It is used to store the underlying boot class path.
386 _boot_class_path = new PathString(nullptr);
387
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
389 "Java Virtual Machine Specification", false));
390 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
392 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
393
394 // Initialize the vm.info now, but it will need updating after argument parsing.
395 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
396
397 // Following are JVMTI agent writable properties.
398 // Properties values are set to nullptr and they are
399 // os specific they are initialized in os::init_system_properties_values().
400 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
401 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
402 _java_home = new SystemProperty("java.home", nullptr, true);
403 _java_class_path = new SystemProperty("java.class.path", "", true);
404 // jdk.boot.class.path.append is a non-writeable, internal property.
405 // It can only be set by either:
406 // - -Xbootclasspath/a:
407 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
408 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
409
410 // Add to System Property list.
411 PropertyList_add(&_system_properties, _sun_boot_library_path);
412 PropertyList_add(&_system_properties, _java_library_path);
413 PropertyList_add(&_system_properties, _java_home);
414 PropertyList_add(&_system_properties, _java_class_path);
415 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
416 PropertyList_add(&_system_properties, _vm_info);
417
418 // Set OS specific system properties values
419 os::init_system_properties_values();
420 }
421
422 // Update/Initialize System properties after JDK version number is known
423 void Arguments::init_version_specific_system_properties() {
424 enum { bufsz = 16 };
425 char buffer[bufsz];
426 const char* spec_vendor = "Oracle Corporation";
427 uint32_t spec_version = JDK_Version::current().major_version();
428
429 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
430
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.specification.version", buffer, false));
435 PropertyList_add(&_system_properties,
436 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
437 }
438
439 /*
440 * -XX argument processing:
441 *
442 * -XX arguments are defined in several places, such as:
443 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
444 * -XX arguments are parsed in parse_argument().
445 * -XX argument bounds checking is done in check_vm_args_consistency().
446 *
447 * Over time -XX arguments may change. There are mechanisms to handle common cases:
448 *
449 * ALIASED: An option that is simply another name for another option. This is often
450 * part of the process of deprecating a flag, but not all aliases need
451 * to be deprecated.
452 *
453 * Create an alias for an option by adding the old and new option names to the
454 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
455 *
456 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
457 * support may be removed in the future. Both regular and aliased options may be
458 * deprecated.
459 *
460 * Add a deprecation warning for an option (or alias) by adding an entry in the
461 * "special_jvm_flags" table and setting the "deprecated_in" field.
462 * Often an option "deprecated" in one major release will
463 * be made "obsolete" in the next. In this case the entry should also have its
464 * "obsolete_in" field set.
465 *
466 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
467 * on the command line. A warning is printed to let the user know that option might not
468 * be accepted in the future.
469 *
470 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
471 * table and setting the "obsolete_in" field.
472 *
473 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
474 * to the current JDK version. The system will flatly refuse to admit the existence of
475 * the flag. This allows a flag to die automatically over JDK releases.
476 *
477 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
478 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
479 * - Newly obsolete or expired deprecated options should have their global variable
480 * definitions removed (from globals.hpp, etc) and related implementations removed.
481 *
482 * Recommended approach for removing options:
483 *
484 * To remove options commonly used by customers (e.g. product -XX options), use
485 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
486 *
487 * To remove internal options (e.g. diagnostic, experimental, develop options), use
488 * a 2-step model adding major release numbers to the obsolete and expire columns.
489 *
490 * To change the name of an option, use the alias table as well as a 2-step
491 * model adding major release numbers to the deprecate and expire columns.
492 * Think twice about aliasing commonly used customer options.
493 *
494 * There are times when it is appropriate to leave a future release number as undefined.
495 *
496 * Tests: Aliases should be tested in VMAliasOptions.java.
497 * Deprecated options should be tested in VMDeprecatedOptions.java.
498 */
499
500 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
501 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
502 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
503 // the command-line as usual, but will issue a warning.
504 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
505 // the command-line, while issuing a warning and ignoring the flag value.
506 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
507 // existence of the flag.
508 //
509 // MANUAL CLEANUP ON JDK VERSION UPDATES:
510 // This table ensures that the handling of options will update automatically when the JDK
511 // version is incremented, but the source code needs to be cleanup up manually:
512 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
513 // variable should be removed, as well as users of the variable.
514 // - As "deprecated" options age into "obsolete" options, move the entry into the
515 // "Obsolete Flags" section of the table.
516 // - All expired options should be removed from the table.
517 static SpecialFlag const special_jvm_flags[] = {
518 // -------------- Deprecated Flags --------------
519 // --- Non-alias flags - sorted by obsolete_in then expired_in:
520 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
524 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
525 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
526 #ifdef LINUX
527 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
528 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
529 #endif
530 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
531 #ifdef _LP64
532 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
533 #endif
534 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
535 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
536
537 // -------------- Obsolete Flags - sorted by expired_in --------------
538
539 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
540 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
541 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
542
543 #ifdef ASSERT
544 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
545 #endif
546
547 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
548 // These entries will generate build errors. Their purpose is to test the macros.
549 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
550 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
551 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
552 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
553 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
554 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
556 #endif
557
558 { nullptr, JDK_Version(0), JDK_Version(0) }
559 };
560
561 // Flags that are aliases for other flags.
562 typedef struct {
563 const char* alias_name;
564 const char* real_name;
565 } AliasedFlag;
566
567 static AliasedFlag const aliased_jvm_flags[] = {
568 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
569 { nullptr, nullptr}
570 };
571
572 // Return true if "v" is less than "other", where "other" may be "undefined".
573 static bool version_less_than(JDK_Version v, JDK_Version other) {
574 assert(!v.is_undefined(), "must be defined");
575 if (!other.is_undefined() && v.compare(other) >= 0) {
576 return false;
577 } else {
578 return true;
579 }
580 }
581
582 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
583 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
584 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
585 flag = special_jvm_flags[i];
586 return true;
587 }
588 }
589 return false;
590 }
591
592 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
593 assert(version != nullptr, "Must provide a version buffer");
594 SpecialFlag flag;
595 if (lookup_special_flag(flag_name, flag)) {
596 if (!flag.obsolete_in.is_undefined()) {
597 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
598 *version = flag.obsolete_in;
599 // This flag may have been marked for obsoletion in this version, but we may not
600 // have actually removed it yet. Rather than ignoring it as soon as we reach
601 // this version we allow some time for the removal to happen. So if the flag
602 // still actually exists we process it as normal, but issue an adjusted warning.
603 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
604 if (real_flag != nullptr) {
605 char version_str[256];
606 version->to_string(version_str, sizeof(version_str));
607 warning("Temporarily processing option %s; support is scheduled for removal in %s",
608 flag_name, version_str);
609 return false;
610 }
611 return true;
612 }
613 }
614 }
615 return false;
616 }
617
618 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
619 assert(version != nullptr, "Must provide a version buffer");
620 SpecialFlag flag;
621 if (lookup_special_flag(flag_name, flag)) {
622 if (!flag.deprecated_in.is_undefined()) {
623 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
624 version_less_than(JDK_Version::current(), flag.expired_in)) {
625 *version = flag.deprecated_in;
626 return 1;
627 } else {
628 return -1;
629 }
630 }
631 }
632 return 0;
633 }
634
635 const char* Arguments::real_flag_name(const char *flag_name) {
636 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
637 const AliasedFlag& flag_status = aliased_jvm_flags[i];
638 if (strcmp(flag_status.alias_name, flag_name) == 0) {
639 return flag_status.real_name;
640 }
641 }
642 return flag_name;
643 }
644
645 #ifdef ASSERT
646 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
647 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
648 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
649 return true;
650 }
651 }
652 return false;
653 }
654
655 // Verifies the correctness of the entries in the special_jvm_flags table.
656 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
657 // version being earlier than the deprecation version, then a warning is issued
658 // and verification fails - by returning false. If it is detected that the table
659 // is out of date, with respect to the current version, then ideally a warning is
660 // issued but verification does not fail. This allows the VM to operate when the
661 // version is first updated, without needing to update all the impacted flags at
662 // the same time. In practice we can't issue the warning immediately when the version
663 // is updated as it occurs for every test and some tests are not prepared to handle
664 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
665 // if the check_globals flag is true, and in addition allow a grace period and only
666 // check for stale flags when we hit build 25 (which is far enough into the 6 month
667 // release cycle that all flag updates should have been processed, whilst still
668 // leaving time to make the change before RDP2).
669 // We use a gtest to call this, passing true, so that we can detect stale flags before
670 // the end of the release cycle.
671
672 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
673
674 bool Arguments::verify_special_jvm_flags(bool check_globals) {
675 bool success = true;
676 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
677 const SpecialFlag& flag = special_jvm_flags[i];
678 if (lookup_special_flag(flag.name, i)) {
679 warning("Duplicate special flag declaration \"%s\"", flag.name);
680 success = false;
681 }
682 if (flag.deprecated_in.is_undefined() &&
683 flag.obsolete_in.is_undefined()) {
684 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
685 success = false;
686 }
687
688 if (!flag.deprecated_in.is_undefined()) {
689 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
690 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
691 success = false;
692 }
693
694 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
695 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
696 success = false;
697 }
698 }
699
700 if (!flag.obsolete_in.is_undefined()) {
701 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
702 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
703 success = false;
704 }
705
706 // if flag has become obsolete it should not have a "globals" flag defined anymore.
707 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
708 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
709 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
710 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
711 success = false;
712 }
713 }
714
715 } else if (!flag.expired_in.is_undefined()) {
716 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
717 success = false;
718 }
719
720 if (!flag.expired_in.is_undefined()) {
721 // if flag has become expired it should not have a "globals" flag defined anymore.
722 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
723 !version_less_than(JDK_Version::current(), flag.expired_in)) {
724 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
725 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
726 success = false;
727 }
728 }
729 }
730 }
731 return success;
732 }
733 #endif
734
735 bool Arguments::atojulong(const char *s, julong* result) {
736 return parse_integer(s, result);
737 }
738
739 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
740 if (size < min_size) return arg_too_small;
741 if (size > max_size) return arg_too_big;
742 return arg_in_range;
743 }
744
745 // Describe an argument out of range error
746 void Arguments::describe_range_error(ArgsRange errcode) {
747 switch(errcode) {
748 case arg_too_big:
749 jio_fprintf(defaultStream::error_stream(),
750 "The specified size exceeds the maximum "
751 "representable size.\n");
752 break;
753 case arg_too_small:
754 case arg_unreadable:
755 case arg_in_range:
756 // do nothing for now
757 break;
758 default:
759 ShouldNotReachHere();
760 }
761 }
762
763 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
764 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
765 return true;
766 } else {
767 return false;
768 }
769 }
770
771 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
772 // strtod allows leading whitespace, but our flag format does not.
773 if (*value == '\0' || isspace((unsigned char) *value)) {
774 return false;
775 }
776 char* end;
777 errno = 0;
778 double v = strtod(value, &end);
779 if ((errno != 0) || (*end != 0)) {
780 return false;
781 }
782 if (g_isnan(v) || !g_isfinite(v)) {
783 // Currently we cannot handle these special values.
784 return false;
785 }
786
787 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
788 return true;
789 }
790 return false;
791 }
792
793 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
794 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
795
796 if (flag->is_int()) {
797 int v;
798 if (parse_integer(value, &v)) {
799 result = JVMFlagAccess::set_int(flag, &v, origin);
800 }
801 } else if (flag->is_uint()) {
802 uint v;
803 if (parse_integer(value, &v)) {
804 result = JVMFlagAccess::set_uint(flag, &v, origin);
805 }
806 } else if (flag->is_intx()) {
807 intx v;
808 if (parse_integer(value, &v)) {
809 result = JVMFlagAccess::set_intx(flag, &v, origin);
810 }
811 } else if (flag->is_uintx()) {
812 uintx v;
813 if (parse_integer(value, &v)) {
814 result = JVMFlagAccess::set_uintx(flag, &v, origin);
815 }
816 } else if (flag->is_uint64_t()) {
817 uint64_t v;
818 if (parse_integer(value, &v)) {
819 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
820 }
821 } else if (flag->is_size_t()) {
822 size_t v;
823 if (parse_integer(value, &v)) {
824 result = JVMFlagAccess::set_size_t(flag, &v, origin);
825 }
826 }
827
828 return result == JVMFlag::SUCCESS;
829 }
830
831 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
832 if (value[0] == '\0') {
833 value = nullptr;
834 }
835 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
836 // Contract: JVMFlag always returns a pointer that needs freeing.
837 FREE_C_HEAP_ARRAY(char, value);
838 return true;
839 }
840
841 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
842 const char* old_value = "";
843 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
844 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
845 size_t new_len = strlen(new_value);
846 const char* value;
847 char* free_this_too = nullptr;
848 if (old_len == 0) {
849 value = new_value;
850 } else if (new_len == 0) {
851 value = old_value;
852 } else {
853 size_t length = old_len + 1 + new_len + 1;
854 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
855 // each new setting adds another LINE to the switch:
856 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
857 value = buf;
858 free_this_too = buf;
859 }
860 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
861 // JVMFlag always returns a pointer that needs freeing.
862 FREE_C_HEAP_ARRAY(char, value);
863 // JVMFlag made its own copy, so I must delete my own temp. buffer.
864 FREE_C_HEAP_ARRAY(char, free_this_too);
865 return true;
866 }
867
868 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
869 const char* real_name = real_flag_name(arg);
870 JDK_Version since = JDK_Version();
871 switch (is_deprecated_flag(arg, &since)) {
872 case -1: {
873 // Obsolete or expired, so don't process normally,
874 // but allow for an obsolete flag we're still
875 // temporarily allowing.
876 if (!is_obsolete_flag(arg, &since)) {
877 return real_name;
878 }
879 // Note if we're not considered obsolete then we can't be expired either
880 // as obsoletion must come first.
881 return nullptr;
882 }
883 case 0:
884 return real_name;
885 case 1: {
886 char version[256];
887 since.to_string(version, sizeof(version));
888 if (real_name != arg) {
889 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
890 arg, version, real_name);
891 } else {
892 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
893 arg, version);
894 }
895 return real_name;
896 }
897 }
898 ShouldNotReachHere();
899 return nullptr;
900 }
901
902 #define BUFLEN 255
903
904 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
905 char name_copied[BUFLEN+1];
906 if (name[name_length] != 0) {
907 if (name_length > BUFLEN) {
908 return nullptr;
909 } else {
910 strncpy(name_copied, name, name_length);
911 name_copied[name_length] = '\0';
912 name = name_copied;
913 }
914 }
915
916 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
917 if (real_name == nullptr) {
918 return nullptr;
919 }
920 JVMFlag* flag = JVMFlag::find_flag(real_name);
921 return flag;
922 }
923
924 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
925 bool is_bool = false;
926 bool bool_val = false;
927 char c = *arg;
928 if (c == '+' || c == '-') {
929 is_bool = true;
930 bool_val = (c == '+');
931 arg++;
932 }
933
934 const char* name = arg;
935 while (true) {
936 c = *arg;
937 if (isalnum(c) || (c == '_')) {
938 ++arg;
939 } else {
940 break;
941 }
942 }
943
944 size_t name_len = size_t(arg - name);
945 if (name_len == 0) {
946 return false;
947 }
948
949 JVMFlag* flag = find_jvm_flag(name, name_len);
950 if (flag == nullptr) {
951 return false;
952 }
953
954 if (is_bool) {
955 if (*arg != 0) {
956 // Error -- extra characters such as -XX:+BoolFlag=123
957 return false;
958 }
959 return set_bool_flag(flag, bool_val, origin);
960 }
961
962 if (arg[0] == '=') {
963 const char* value = arg + 1;
964 if (flag->is_ccstr()) {
965 if (flag->ccstr_accumulates()) {
966 return append_to_string_flag(flag, value, origin);
967 } else {
968 return set_string_flag(flag, value, origin);
969 }
970 } else if (flag->is_double()) {
971 return set_fp_numeric_flag(flag, value, origin);
972 } else {
973 return set_numeric_flag(flag, value, origin);
974 }
975 }
976
977 if (arg[0] == ':' && arg[1] == '=') {
978 // -XX:Foo:=xxx will reset the string flag to the given value.
979 const char* value = arg + 2;
980 return set_string_flag(flag, value, origin);
981 }
982
983 return false;
984 }
985
986 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
987 assert(bldarray != nullptr, "illegal argument");
988
989 if (arg == nullptr) {
990 return;
991 }
992
993 int new_count = *count + 1;
994
995 // expand the array and add arg to the last element
996 if (*bldarray == nullptr) {
997 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
998 } else {
999 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1000 }
1001 (*bldarray)[*count] = os::strdup_check_oom(arg);
1002 *count = new_count;
1003 }
1004
1005 void Arguments::build_jvm_args(const char* arg) {
1006 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1007 }
1008
1009 void Arguments::build_jvm_flags(const char* arg) {
1010 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1011 }
1012
1013 // utility function to return a string that concatenates all
1014 // strings in a given char** array
1015 const char* Arguments::build_resource_string(char** args, int count) {
1016 if (args == nullptr || count == 0) {
1017 return nullptr;
1018 }
1019 size_t length = 0;
1020 for (int i = 0; i < count; i++) {
1021 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1022 }
1023 char* s = NEW_RESOURCE_ARRAY(char, length);
1024 char* dst = s;
1025 for (int j = 0; j < count; j++) {
1026 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1027 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1028 dst += offset;
1029 length -= offset;
1030 }
1031 return (const char*) s;
1032 }
1033
1034 void Arguments::print_on(outputStream* st) {
1035 st->print_cr("VM Arguments:");
1036 if (num_jvm_flags() > 0) {
1037 st->print("jvm_flags: "); print_jvm_flags_on(st);
1038 st->cr();
1039 }
1040 if (num_jvm_args() > 0) {
1041 st->print("jvm_args: "); print_jvm_args_on(st);
1042 st->cr();
1043 }
1044 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1045 if (_java_class_path != nullptr) {
1046 char* path = _java_class_path->value();
1047 size_t len = strlen(path);
1048 st->print("java_class_path (initial): ");
1049 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1050 if (len == 0) {
1051 st->print_raw_cr("<not set>");
1052 } else {
1053 st->print_raw_cr(path, len);
1054 }
1055 }
1056 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1057 }
1058
1059 void Arguments::print_summary_on(outputStream* st) {
1060 // Print the command line. Environment variables that are helpful for
1061 // reproducing the problem are written later in the hs_err file.
1062 // flags are from setting file
1063 if (num_jvm_flags() > 0) {
1064 st->print_raw("Settings File: ");
1065 print_jvm_flags_on(st);
1066 st->cr();
1067 }
1068 // args are the command line and environment variable arguments.
1069 st->print_raw("Command Line: ");
1070 if (num_jvm_args() > 0) {
1071 print_jvm_args_on(st);
1072 }
1073 // this is the classfile and any arguments to the java program
1074 if (java_command() != nullptr) {
1075 st->print("%s", java_command());
1076 }
1077 st->cr();
1078 }
1079
1080 void Arguments::print_jvm_flags_on(outputStream* st) {
1081 if (_num_jvm_flags > 0) {
1082 for (int i=0; i < _num_jvm_flags; i++) {
1083 st->print("%s ", _jvm_flags_array[i]);
1084 }
1085 }
1086 }
1087
1088 void Arguments::print_jvm_args_on(outputStream* st) {
1089 if (_num_jvm_args > 0) {
1090 for (int i=0; i < _num_jvm_args; i++) {
1091 st->print("%s ", _jvm_args_array[i]);
1092 }
1093 }
1094 }
1095
1096 bool Arguments::process_argument(const char* arg,
1097 jboolean ignore_unrecognized,
1098 JVMFlagOrigin origin) {
1099 JDK_Version since = JDK_Version();
1100
1101 if (parse_argument(arg, origin)) {
1102 return true;
1103 }
1104
1105 // Determine if the flag has '+', '-', or '=' characters.
1106 bool has_plus_minus = (*arg == '+' || *arg == '-');
1107 const char* const argname = has_plus_minus ? arg + 1 : arg;
1108
1109 size_t arg_len;
1110 const char* equal_sign = strchr(argname, '=');
1111 if (equal_sign == nullptr) {
1112 arg_len = strlen(argname);
1113 } else {
1114 arg_len = equal_sign - argname;
1115 }
1116
1117 // Only make the obsolete check for valid arguments.
1118 if (arg_len <= BUFLEN) {
1119 // Construct a string which consists only of the argument name without '+', '-', or '='.
1120 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1121 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1122 if (is_obsolete_flag(stripped_argname, &since)) {
1123 char version[256];
1124 since.to_string(version, sizeof(version));
1125 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1126 return true;
1127 }
1128 }
1129
1130 // For locked flags, report a custom error message if available.
1131 // Otherwise, report the standard unrecognized VM option.
1132 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1133 if (found_flag != nullptr) {
1134 char locked_message_buf[BUFLEN];
1135 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1136 if (strlen(locked_message_buf) != 0) {
1137 #ifdef PRODUCT
1138 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1139 if (ignore_unrecognized && mismatched) {
1140 return true;
1141 }
1142 #endif
1143 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1144 }
1145 if (found_flag->is_bool() && !has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Missing +/- setting for VM option '%s'\n", argname);
1148 } else if (!found_flag->is_bool() && has_plus_minus) {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Unexpected +/- setting in VM option '%s'\n", argname);
1151 } else {
1152 jio_fprintf(defaultStream::error_stream(),
1153 "Improperly specified VM option '%s'\n", argname);
1154 }
1155 } else {
1156 if (ignore_unrecognized) {
1157 return true;
1158 }
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Unrecognized VM option '%s'\n", argname);
1161 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1162 if (fuzzy_matched != nullptr) {
1163 jio_fprintf(defaultStream::error_stream(),
1164 "Did you mean '%s%s%s'?\n",
1165 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1166 fuzzy_matched->name(),
1167 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1168 }
1169 }
1170
1171 // allow for commandline "commenting out" options like -XX:#+Verbose
1172 return arg[0] == '#';
1173 }
1174
1175 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1176 FILE* stream = os::fopen(file_name, "rb");
1177 if (stream == nullptr) {
1178 if (should_exist) {
1179 jio_fprintf(defaultStream::error_stream(),
1180 "Could not open settings file %s\n", file_name);
1181 return false;
1182 } else {
1183 return true;
1184 }
1185 }
1186
1187 char token[1024];
1188 int pos = 0;
1189
1190 bool in_white_space = true;
1191 bool in_comment = false;
1192 bool in_quote = false;
1193 int quote_c = 0;
1194 bool result = true;
1195
1196 int c = getc(stream);
1197 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1198 if (in_white_space) {
1199 if (in_comment) {
1200 if (c == '\n') in_comment = false;
1201 } else {
1202 if (c == '#') in_comment = true;
1203 else if (!isspace((unsigned char) c)) {
1204 in_white_space = false;
1205 token[pos++] = checked_cast<char>(c);
1206 }
1207 }
1208 } else {
1209 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1210 // token ends at newline, or at unquoted whitespace
1211 // this allows a way to include spaces in string-valued options
1212 token[pos] = '\0';
1213 logOption(token);
1214 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1215 build_jvm_flags(token);
1216 pos = 0;
1217 in_white_space = true;
1218 in_quote = false;
1219 } else if (!in_quote && (c == '\'' || c == '"')) {
1220 in_quote = true;
1221 quote_c = c;
1222 } else if (in_quote && (c == quote_c)) {
1223 in_quote = false;
1224 } else {
1225 token[pos++] = checked_cast<char>(c);
1226 }
1227 }
1228 c = getc(stream);
1229 }
1230 if (pos > 0) {
1231 token[pos] = '\0';
1232 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1233 build_jvm_flags(token);
1234 }
1235 fclose(stream);
1236 return result;
1237 }
1238
1239 //=============================================================================================================
1240 // Parsing of properties (-D)
1241
1242 const char* Arguments::get_property(const char* key) {
1243 return PropertyList_get_value(system_properties(), key);
1244 }
1245
1246 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1247 const char* eq = strchr(prop, '=');
1248 const char* key;
1249 const char* value = "";
1250
1251 if (eq == nullptr) {
1252 // property doesn't have a value, thus use passed string
1253 key = prop;
1254 } else {
1255 // property have a value, thus extract it and save to the
1256 // allocated string
1257 size_t key_len = eq - prop;
1258 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1259
1260 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1261 key = tmp_key;
1262
1263 value = &prop[key_len + 1];
1264 }
1265
1266 if (internal == ExternalProperty) {
1267 CDSConfig::check_incompatible_property(key, value);
1268 }
1269
1270 if (strcmp(key, "java.compiler") == 0) {
1271 // we no longer support java.compiler system property, log a warning and let it get
1272 // passed to Java, like any other system property
1273 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1274 // for applications using NONE or empty value, log a more informative message
1275 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1276 } else {
1277 warning("The java.compiler system property is obsolete and no longer supported.");
1278 }
1279 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1280 // append is true, writable is true, internal is false
1281 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1282 WriteableProperty, ExternalProperty);
1283 } else {
1284 if (strcmp(key, "sun.java.command") == 0) {
1285 char *old_java_command = _java_command;
1286 _java_command = os::strdup_check_oom(value, mtArguments);
1287 if (old_java_command != nullptr) {
1288 os::free(old_java_command);
1289 }
1290 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1291 // If this property is set on the command line then its value will be
1292 // displayed in VM error logs as the URL at which to submit such logs.
1293 // Normally the URL displayed in error logs is different from the value
1294 // of this system property, so a different property should have been
1295 // used here, but we leave this as-is in case someone depends upon it.
1296 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1297 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1298 // its value without going through the property list or making a Java call.
1299 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1300 if (old_java_vendor_url_bug != nullptr) {
1301 os::free((void *)old_java_vendor_url_bug);
1302 }
1303 }
1304
1305 // Create new property and add at the end of the list
1306 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1307 }
1308
1309 if (key != prop) {
1310 // SystemProperty copy passed value, thus free previously allocated
1311 // memory
1312 FreeHeap((void *)key);
1313 }
1314
1315 return true;
1316 }
1317
1318 //===========================================================================================================
1319 // Setting int/mixed/comp mode flags
1320
1321 void Arguments::set_mode_flags(Mode mode) {
1322 // Set up default values for all flags.
1323 // If you add a flag to any of the branches below,
1324 // add a default value for it here.
1325 _mode = mode;
1326
1327 // Ensure Agent_OnLoad has the correct initial values.
1328 // This may not be the final mode; mode may change later in onload phase.
1329 PropertyList_unique_add(&_system_properties, "java.vm.info",
1330 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1331
1332 UseInterpreter = true;
1333 UseCompiler = true;
1334 UseLoopCounter = true;
1335
1336 // Default values may be platform/compiler dependent -
1337 // use the saved values
1338 ClipInlining = Arguments::_ClipInlining;
1339 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1340 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1341 BackgroundCompilation = Arguments::_BackgroundCompilation;
1342
1343 // Change from defaults based on mode
1344 switch (mode) {
1345 default:
1346 ShouldNotReachHere();
1347 break;
1348 case _int:
1349 UseCompiler = false;
1350 UseLoopCounter = false;
1351 AlwaysCompileLoopMethods = false;
1352 UseOnStackReplacement = false;
1353 break;
1354 case _mixed:
1355 // same as default
1356 break;
1357 case _comp:
1358 UseInterpreter = false;
1359 BackgroundCompilation = false;
1360 ClipInlining = false;
1361 break;
1362 }
1363 }
1364
1365 // Conflict: required to use shared spaces (-Xshare:on), but
1366 // incompatible command line options were chosen.
1367 void Arguments::no_shared_spaces(const char* message) {
1368 if (RequireSharedSpaces) {
1369 aot_log_error(aot)("%s is incompatible with other specified options.",
1370 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1371 if (CDSConfig::new_aot_flags_used()) {
1372 vm_exit_during_initialization("Unable to use AOT cache", message);
1373 } else {
1374 vm_exit_during_initialization("Unable to use shared archive", message);
1375 }
1376 } else {
1377 if (CDSConfig::new_aot_flags_used()) {
1378 log_warning(aot)("Unable to use AOT cache: %s", message);
1379 } else {
1380 aot_log_info(aot)("Unable to use shared archive: %s", message);
1381 }
1382 UseSharedSpaces = false;
1383 }
1384 }
1385
1386 static void set_object_alignment() {
1387 // Object alignment.
1388 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1389 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1390 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1391 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1392 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1393 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1394
1395 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1396 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1397
1398 // Oop encoding heap max
1399 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1400 }
1401
1402 size_t Arguments::max_heap_for_compressed_oops() {
1403 // Avoid sign flip.
1404 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1405 // We need to fit both the null page and the heap into the memory budget, while
1406 // keeping alignment constraints of the heap. To guarantee the latter, as the
1407 // null page is located before the heap, we pad the null page to the conservative
1408 // maximum alignment that the GC may ever impose upon the heap.
1409 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1410 _conservative_max_heap_alignment);
1411
1412 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1413 NOT_LP64(ShouldNotReachHere(); return 0);
1414 }
1415
1416 void Arguments::set_use_compressed_oops() {
1417 #ifdef _LP64
1418 // MaxHeapSize is not set up properly at this point, but
1419 // the only value that can override MaxHeapSize if we are
1420 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1421 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1422
1423 if (max_heap_size <= max_heap_for_compressed_oops()) {
1424 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1425 FLAG_SET_ERGO(UseCompressedOops, true);
1426 }
1427 } else {
1428 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1429 warning("Max heap size too large for Compressed Oops");
1430 FLAG_SET_DEFAULT(UseCompressedOops, false);
1431 }
1432 }
1433 #endif // _LP64
1434 }
1435
1436 void Arguments::set_conservative_max_heap_alignment() {
1437 // The conservative maximum required alignment for the heap is the maximum of
1438 // the alignments imposed by several sources: any requirements from the heap
1439 // itself and the maximum page size we may run the VM with.
1440 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1441 _conservative_max_heap_alignment = MAX4(heap_alignment,
1442 os::vm_allocation_granularity(),
1443 os::max_page_size(),
1444 GCArguments::compute_heap_alignment());
1445 }
1446
1447 jint Arguments::set_ergonomics_flags() {
1448 GCConfig::initialize();
1449
1450 set_conservative_max_heap_alignment();
1451
1452 #ifdef _LP64
1453 set_use_compressed_oops();
1454
1455 // Also checks that certain machines are slower with compressed oops
1456 // in vm_version initialization code.
1457 #endif // _LP64
1458
1459 return JNI_OK;
1460 }
1461
1462 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1463 size_t max_allocatable;
1464 size_t result = limit;
1465 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1466 // The AggressiveHeap check is a temporary workaround to avoid calling
1467 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1468 // selected. This works because AggressiveHeap implies UseParallelGC
1469 // where we know the ratio will be 1. Once the AggressiveHeap option is
1470 // removed, this can be cleaned up.
1471 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1472 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1473 result = MIN2(result, max_allocatable / fraction);
1474 }
1475 return result;
1476 }
1477
1478 // Use static initialization to get the default before parsing
1479 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1480
1481 void Arguments::set_heap_size() {
1482 julong phys_mem;
1483
1484 // If the user specified one of these options, they
1485 // want specific memory sizing so do not limit memory
1486 // based on compressed oops addressability.
1487 // Also, memory limits will be calculated based on
1488 // available os physical memory, not our MaxRAM limit,
1489 // unless MaxRAM is also specified.
1490 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(MaxRAM));
1494 if (override_coop_limit) {
1495 if (FLAG_IS_DEFAULT(MaxRAM)) {
1496 phys_mem = os::physical_memory();
1497 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1498 } else {
1499 phys_mem = (julong)MaxRAM;
1500 }
1501 } else {
1502 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1503 : (julong)MaxRAM;
1504 }
1505
1506 // If the maximum heap size has not been set with -Xmx,
1507 // then set it as fraction of the size of physical memory,
1508 // respecting the maximum and minimum sizes of the heap.
1509 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1510 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1511 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1512 if (reasonable_min < MaxHeapSize) {
1513 // Small physical memory, so use a minimum fraction of it for the heap
1514 reasonable_max = reasonable_min;
1515 } else {
1516 // Not-small physical memory, so require a heap at least
1517 // as large as MaxHeapSize
1518 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1519 }
1520
1521 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1522 // Limit the heap size to ErgoHeapSizeLimit
1523 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1524 }
1525
1526 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1527
1528 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1529 // An initial heap size was specified on the command line,
1530 // so be sure that the maximum size is consistent. Done
1531 // after call to limit_heap_by_allocatable_memory because that
1532 // method might reduce the allocation size.
1533 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1534 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1535 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1536 }
1537
1538 #ifdef _LP64
1539 if (UseCompressedOops || UseCompressedClassPointers) {
1540 // HeapBaseMinAddress can be greater than default but not less than.
1541 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1542 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1543 // matches compressed oops printing flags
1544 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1545 " (%zuG) which is greater than value given %zu",
1546 DefaultHeapBaseMinAddress,
1547 DefaultHeapBaseMinAddress/G,
1548 HeapBaseMinAddress);
1549 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1550 }
1551 }
1552 }
1553 if (UseCompressedOops) {
1554 // Limit the heap size to the maximum possible when using compressed oops
1555 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1556
1557 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1558 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1559 // but it should be not less than default MaxHeapSize.
1560 max_coop_heap -= HeapBaseMinAddress;
1561 }
1562
1563 // If user specified flags prioritizing os physical
1564 // memory limits, then disable compressed oops if
1565 // limits exceed max_coop_heap and UseCompressedOops
1566 // was not specified.
1567 if (reasonable_max > max_coop_heap) {
1568 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1569 aot_log_info(aot)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1570 " max heap %zu > compressed oop heap %zu. "
1571 "Please check the setting of MaxRAMPercentage %5.2f."
1572 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1573 FLAG_SET_ERGO(UseCompressedOops, false);
1574 } else {
1575 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1576 }
1577 }
1578 }
1579 #endif // _LP64
1580
1581 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1582 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1583 }
1584
1585 // If the minimum or initial heap_size have not been set or requested to be set
1586 // ergonomically, set them accordingly.
1587 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1588 julong reasonable_minimum = (julong)(OldSize + NewSize);
1589
1590 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1591
1592 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1593
1594 if (InitialHeapSize == 0) {
1595 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1596 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1597
1598 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1599 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1600
1601 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1602 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1603 }
1604 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1605 // synchronize with InitialHeapSize to avoid errors with the default value.
1606 if (MinHeapSize == 0) {
1607 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1608 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1609 }
1610 }
1611 }
1612
1613 // This option inspects the machine and attempts to set various
1614 // parameters to be optimal for long-running, memory allocation
1615 // intensive jobs. It is intended for machines with large
1616 // amounts of cpu and memory.
1617 jint Arguments::set_aggressive_heap_flags() {
1618 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1619 // VM, but we may not be able to represent the total physical memory
1620 // available (like having 8gb of memory on a box but using a 32bit VM).
1621 // Thus, we need to make sure we're using a julong for intermediate
1622 // calculations.
1623 julong initHeapSize;
1624 julong total_memory = os::physical_memory();
1625
1626 if (total_memory < (julong) 256 * M) {
1627 jio_fprintf(defaultStream::error_stream(),
1628 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1629 vm_exit(1);
1630 }
1631
1632 // The heap size is half of available memory, or (at most)
1633 // all of possible memory less 160mb (leaving room for the OS
1634 // when using ISM). This is the maximum; because adaptive sizing
1635 // is turned on below, the actual space used may be smaller.
1636
1637 initHeapSize = MIN2(total_memory / (julong) 2,
1638 total_memory - (julong) 160 * M);
1639
1640 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1641
1642 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1643 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1644 return JNI_EINVAL;
1645 }
1646 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1650 return JNI_EINVAL;
1651 }
1652 }
1653 if (FLAG_IS_DEFAULT(NewSize)) {
1654 // Make the young generation 3/8ths of the total heap.
1655 if (FLAG_SET_CMDLINE(NewSize,
1656 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 }
1663
1664 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1665 FLAG_SET_DEFAULT(UseLargePages, true);
1666 #endif
1667
1668 // Increase some data structure sizes for efficiency
1669 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675
1676 // See the OldPLABSize comment below, but replace 'after promotion'
1677 // with 'after copying'. YoungPLABSize is the size of the survivor
1678 // space per-gc-thread buffers. The default is 4kw.
1679 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1680 return JNI_EINVAL;
1681 }
1682
1683 // OldPLABSize is the size of the buffers in the old gen that
1684 // UseParallelGC uses to promote live data that doesn't fit in the
1685 // survivor spaces. At any given time, there's one for each gc thread.
1686 // The default size is 1kw. These buffers are rarely used, since the
1687 // survivor spaces are usually big enough. For specjbb, however, there
1688 // are occasions when there's lots of live data in the young gen
1689 // and we end up promoting some of it. We don't have a definite
1690 // explanation for why bumping OldPLABSize helps, but the theory
1691 // is that a bigger PLAB results in retaining something like the
1692 // original allocation order after promotion, which improves mutator
1693 // locality. A minor effect may be that larger PLABs reduce the
1694 // number of PLAB allocation events during gc. The value of 8kw
1695 // was arrived at by experimenting with specjbb.
1696 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1697 return JNI_EINVAL;
1698 }
1699
1700 // Enable parallel GC and adaptive generation sizing
1701 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1702 return JNI_EINVAL;
1703 }
1704
1705 // Encourage steady state memory management
1706 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1707 return JNI_EINVAL;
1708 }
1709
1710 return JNI_OK;
1711 }
1712
1713 // This must be called after ergonomics.
1714 void Arguments::set_bytecode_flags() {
1715 if (!RewriteBytecodes) {
1716 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1717 }
1718 }
1719
1720 // Aggressive optimization flags
1721 jint Arguments::set_aggressive_opts_flags() {
1722 #ifdef COMPILER2
1723 if (AggressiveUnboxing) {
1724 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1725 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1726 } else if (!EliminateAutoBox) {
1727 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1728 AggressiveUnboxing = false;
1729 }
1730 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1731 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1732 } else if (!DoEscapeAnalysis) {
1733 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1734 AggressiveUnboxing = false;
1735 }
1736 }
1737 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1738 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1739 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1740 }
1741 // Feed the cache size setting into the JDK
1742 char buffer[1024];
1743 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1744 if (!add_property(buffer)) {
1745 return JNI_ENOMEM;
1746 }
1747 }
1748 #endif
1749
1750 return JNI_OK;
1751 }
1752
1753 //===========================================================================================================
1754
1755 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1756 if (_sun_java_launcher != _default_java_launcher) {
1757 os::free(const_cast<char*>(_sun_java_launcher));
1758 }
1759 _sun_java_launcher = os::strdup_check_oom(launcher);
1760 }
1761
1762 bool Arguments::created_by_java_launcher() {
1763 assert(_sun_java_launcher != nullptr, "property must have value");
1764 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1765 }
1766
1767 bool Arguments::executing_unit_tests() {
1768 return _executing_unit_tests;
1769 }
1770
1771 //===========================================================================================================
1772 // Parsing of main arguments
1773
1774 static unsigned int addreads_count = 0;
1775 static unsigned int addexports_count = 0;
1776 static unsigned int addopens_count = 0;
1777 static unsigned int patch_mod_count = 0;
1778 static unsigned int enable_native_access_count = 0;
1779 static bool patch_mod_javabase = false;
1780
1781 // Check the consistency of vm_init_args
1782 bool Arguments::check_vm_args_consistency() {
1783 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1784 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1785 return false;
1786 }
1787
1788 // Method for adding checks for flag consistency.
1789 // The intent is to warn the user of all possible conflicts,
1790 // before returning an error.
1791 // Note: Needs platform-dependent factoring.
1792 bool status = true;
1793
1794 if (TLABRefillWasteFraction == 0) {
1795 jio_fprintf(defaultStream::error_stream(),
1796 "TLABRefillWasteFraction should be a denominator, "
1797 "not %zu\n",
1798 TLABRefillWasteFraction);
1799 status = false;
1800 }
1801
1802 status = CompilerConfig::check_args_consistency(status);
1803 #if INCLUDE_JVMCI
1804 if (status && EnableJVMCI) {
1805 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1806 // was explicitly set on the command line or in the jimage.
1807 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1808 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1809 return false;
1810 }
1811 }
1812 }
1813 #endif
1814
1815 #if INCLUDE_JFR
1816 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1817 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1818 return false;
1819 }
1820 }
1821 #endif
1822
1823 #ifndef SUPPORT_RESERVED_STACK_AREA
1824 if (StackReservedPages != 0) {
1825 FLAG_SET_CMDLINE(StackReservedPages, 0);
1826 warning("Reserved Stack Area not supported on this platform");
1827 }
1828 #endif
1829
1830 #ifndef _LP64
1831 if (LockingMode == LM_LEGACY) {
1832 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1833 // Self-forwarding in bit 3 of the mark-word conflicts
1834 // with 4-byte-aligned stack-locks.
1835 warning("Legacy locking not supported on this platform");
1836 }
1837 #endif
1838
1839 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1840 // ObjectMonitorTable requires lightweight locking.
1841 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1842 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1843 }
1844
1845 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1846 if (LockingMode == LM_MONITOR) {
1847 jio_fprintf(defaultStream::error_stream(),
1848 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1849 return false;
1850 }
1851 #endif
1852 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1853 jio_fprintf(defaultStream::error_stream(),
1854 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1855 return false;
1856 }
1857 return status;
1858 }
1859
1860 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1861 const char* option_type) {
1862 if (ignore) return false;
1863
1864 const char* spacer = " ";
1865 if (option_type == nullptr) {
1866 option_type = ++spacer; // Set both to the empty string.
1867 }
1868
1869 jio_fprintf(defaultStream::error_stream(),
1870 "Unrecognized %s%soption: %s\n", option_type, spacer,
1871 option->optionString);
1872 return true;
1873 }
1874
1875 static const char* user_assertion_options[] = {
1876 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1877 };
1878
1879 static const char* system_assertion_options[] = {
1880 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1881 };
1882
1883 bool Arguments::parse_uint(const char* value,
1884 uint* uint_arg,
1885 uint min_size) {
1886 uint n;
1887 if (!parse_integer(value, &n)) {
1888 return false;
1889 }
1890 if (n >= min_size) {
1891 *uint_arg = n;
1892 return true;
1893 } else {
1894 return false;
1895 }
1896 }
1897
1898 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1899 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1900 CDSConfig::check_internal_module_property(prop_name, prop_value);
1901 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1902 char* property = AllocateHeap(prop_len, mtArguments);
1903 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1904 if (ret < 0 || ret >= (int)prop_len) {
1905 FreeHeap(property);
1906 return false;
1907 }
1908 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1909 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1910 // that multiple occurrences of the associated flag just causes the existing property value to be
1911 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1912 // to a property after we have finished flag processing.
1913 bool added = add_property(property, WriteableProperty, internal);
1914 FreeHeap(property);
1915 return added;
1916 }
1917
1918 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1919 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1920 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1921 const unsigned int props_count_limit = 1000;
1922 const int max_digits = 3;
1923 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1924
1925 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1926 if (count < props_count_limit) {
1927 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1928 char* property = AllocateHeap(prop_len, mtArguments);
1929 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1930 if (ret < 0 || ret >= (int)prop_len) {
1931 FreeHeap(property);
1932 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1933 return false;
1934 }
1935 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1936 FreeHeap(property);
1937 return added;
1938 }
1939
1940 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1941 return false;
1942 }
1943
1944 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1945 julong* long_arg,
1946 julong min_size,
1947 julong max_size) {
1948 if (!parse_integer(s, long_arg)) return arg_unreadable;
1949 return check_memory_size(*long_arg, min_size, max_size);
1950 }
1951
1952 // Parse JavaVMInitArgs structure
1953
1954 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1955 const JavaVMInitArgs *java_tool_options_args,
1956 const JavaVMInitArgs *java_options_args,
1957 const JavaVMInitArgs *cmd_line_args) {
1958 // Save default settings for some mode flags
1959 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1960 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1961 Arguments::_ClipInlining = ClipInlining;
1962 Arguments::_BackgroundCompilation = BackgroundCompilation;
1963
1964 // Remember the default value of SharedBaseAddress.
1965 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1966
1967 // Setup flags for mixed which is the default
1968 set_mode_flags(_mixed);
1969
1970 // Parse args structure generated from java.base vm options resource
1971 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1972 if (result != JNI_OK) {
1973 return result;
1974 }
1975
1976 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1977 // variable (if present).
1978 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1979 if (result != JNI_OK) {
1980 return result;
1981 }
1982
1983 // Parse args structure generated from the command line flags.
1984 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1985 if (result != JNI_OK) {
1986 return result;
1987 }
1988
1989 // Parse args structure generated from the _JAVA_OPTIONS environment
1990 // variable (if present) (mimics classic VM)
1991 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1992 if (result != JNI_OK) {
1993 return result;
1994 }
1995
1996 // Disable CDS for exploded image
1997 if (!has_jimage()) {
1998 no_shared_spaces("CDS disabled on exploded JDK");
1999 }
2000
2001 // We need to ensure processor and memory resources have been properly
2002 // configured - which may rely on arguments we just processed - before
2003 // doing the final argument processing. Any argument processing that
2004 // needs to know about processor and memory resources must occur after
2005 // this point.
2006
2007 os::init_container_support();
2008
2009 SystemMemoryBarrier::initialize();
2010
2011 // Do final processing now that all arguments have been parsed
2012 result = finalize_vm_init_args();
2013 if (result != JNI_OK) {
2014 return result;
2015 }
2016
2017 return JNI_OK;
2018 }
2019
2020 #if !INCLUDE_JVMTI || INCLUDE_CDS
2021 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2022 // represents a valid JDWP agent. is_path==true denotes that we
2023 // are dealing with -agentpath (case where name is a path), otherwise with
2024 // -agentlib
2025 static bool valid_jdwp_agent(char *name, bool is_path) {
2026 char *_name;
2027 const char *_jdwp = "jdwp";
2028 size_t _len_jdwp, _len_prefix;
2029
2030 if (is_path) {
2031 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2032 return false;
2033 }
2034
2035 _name++; // skip past last path separator
2036 _len_prefix = strlen(JNI_LIB_PREFIX);
2037
2038 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2039 return false;
2040 }
2041
2042 _name += _len_prefix;
2043 _len_jdwp = strlen(_jdwp);
2044
2045 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2046 _name += _len_jdwp;
2047 }
2048 else {
2049 return false;
2050 }
2051
2052 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2053 return false;
2054 }
2055
2056 return true;
2057 }
2058
2059 if (strcmp(name, _jdwp) == 0) {
2060 return true;
2061 }
2062
2063 return false;
2064 }
2065 #endif
2066
2067 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2068 // --patch-module=<module>=<file>(<pathsep><file>)*
2069 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2070 // Find the equal sign between the module name and the path specification
2071 const char* module_equal = strchr(patch_mod_tail, '=');
2072 if (module_equal == nullptr) {
2073 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2074 return JNI_ERR;
2075 } else {
2076 // Pick out the module name
2077 size_t module_len = module_equal - patch_mod_tail;
2078 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2079 if (module_name != nullptr) {
2080 memcpy(module_name, patch_mod_tail, module_len);
2081 *(module_name + module_len) = '\0';
2082 // The path piece begins one past the module_equal sign
2083 add_patch_mod_prefix(module_name, module_equal + 1);
2084 FREE_C_HEAP_ARRAY(char, module_name);
2085 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2086 return JNI_ENOMEM;
2087 }
2088 } else {
2089 return JNI_ENOMEM;
2090 }
2091 }
2092 return JNI_OK;
2093 }
2094
2095 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2096 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2097 // The min and max sizes match the values in globals.hpp, but scaled
2098 // with K. The values have been chosen so that alignment with page
2099 // size doesn't change the max value, which makes the conversions
2100 // back and forth between Xss value and ThreadStackSize value easier.
2101 // The values have also been chosen to fit inside a 32-bit signed type.
2102 const julong min_ThreadStackSize = 0;
2103 const julong max_ThreadStackSize = 1 * M;
2104
2105 // Make sure the above values match the range set in globals.hpp
2106 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2107 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2108 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2109
2110 const julong min_size = min_ThreadStackSize * K;
2111 const julong max_size = max_ThreadStackSize * K;
2112
2113 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2114
2115 julong size = 0;
2116 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2117 if (errcode != arg_in_range) {
2118 bool silent = (option == nullptr); // Allow testing to silence error messages
2119 if (!silent) {
2120 jio_fprintf(defaultStream::error_stream(),
2121 "Invalid thread stack size: %s\n", option->optionString);
2122 describe_range_error(errcode);
2123 }
2124 return JNI_EINVAL;
2125 }
2126
2127 // Internally track ThreadStackSize in units of 1024 bytes.
2128 const julong size_aligned = align_up(size, K);
2129 assert(size <= size_aligned,
2130 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2131 size, size_aligned);
2132
2133 const julong size_in_K = size_aligned / K;
2134 assert(size_in_K < (julong)max_intx,
2135 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2136 size_in_K);
2137
2138 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2139 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2140 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2141 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2142 max_expanded, size_in_K);
2143
2144 *out_ThreadStackSize = (intx)size_in_K;
2145
2146 return JNI_OK;
2147 }
2148
2149 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2150 // For match_option to return remaining or value part of option string
2151 const char* tail;
2152
2153 // iterate over arguments
2154 for (int index = 0; index < args->nOptions; index++) {
2155 bool is_absolute_path = false; // for -agentpath vs -agentlib
2156
2157 const JavaVMOption* option = args->options + index;
2158
2159 if (!match_option(option, "-Djava.class.path", &tail) &&
2160 !match_option(option, "-Dsun.java.command", &tail) &&
2161 !match_option(option, "-Dsun.java.launcher", &tail)) {
2162
2163 // add all jvm options to the jvm_args string. This string
2164 // is used later to set the java.vm.args PerfData string constant.
2165 // the -Djava.class.path and the -Dsun.java.command options are
2166 // omitted from jvm_args string as each have their own PerfData
2167 // string constant object.
2168 build_jvm_args(option->optionString);
2169 }
2170
2171 // -verbose:[class/module/gc/jni]
2172 if (match_option(option, "-verbose", &tail)) {
2173 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2174 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2175 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2176 } else if (!strcmp(tail, ":module")) {
2177 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2178 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2179 } else if (!strcmp(tail, ":gc")) {
2180 if (_legacyGCLogging.lastFlag == 0) {
2181 _legacyGCLogging.lastFlag = 1;
2182 }
2183 } else if (!strcmp(tail, ":jni")) {
2184 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2185 }
2186 // -da / -ea / -disableassertions / -enableassertions
2187 // These accept an optional class/package name separated by a colon, e.g.,
2188 // -da:java.lang.Thread.
2189 } else if (match_option(option, user_assertion_options, &tail, true)) {
2190 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2191 if (*tail == '\0') {
2192 JavaAssertions::setUserClassDefault(enable);
2193 } else {
2194 assert(*tail == ':', "bogus match by match_option()");
2195 JavaAssertions::addOption(tail + 1, enable);
2196 }
2197 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2198 } else if (match_option(option, system_assertion_options, &tail, false)) {
2199 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2200 JavaAssertions::setSystemClassDefault(enable);
2201 // -bootclasspath:
2202 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2203 jio_fprintf(defaultStream::output_stream(),
2204 "-Xbootclasspath is no longer a supported option.\n");
2205 return JNI_EINVAL;
2206 // -bootclasspath/a:
2207 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2208 Arguments::append_sysclasspath(tail);
2209 // -bootclasspath/p:
2210 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2211 jio_fprintf(defaultStream::output_stream(),
2212 "-Xbootclasspath/p is no longer a supported option.\n");
2213 return JNI_EINVAL;
2214 // -Xrun
2215 } else if (match_option(option, "-Xrun", &tail)) {
2216 if (tail != nullptr) {
2217 const char* pos = strchr(tail, ':');
2218 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2219 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2220 jio_snprintf(name, len + 1, "%s", tail);
2221
2222 char *options = nullptr;
2223 if(pos != nullptr) {
2224 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2225 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2226 }
2227 #if !INCLUDE_JVMTI
2228 if (strcmp(name, "jdwp") == 0) {
2229 jio_fprintf(defaultStream::error_stream(),
2230 "Debugging agents are not supported in this VM\n");
2231 return JNI_ERR;
2232 }
2233 #endif // !INCLUDE_JVMTI
2234 JvmtiAgentList::add_xrun(name, options, false);
2235 FREE_C_HEAP_ARRAY(char, name);
2236 FREE_C_HEAP_ARRAY(char, options);
2237 }
2238 } else if (match_option(option, "--add-reads=", &tail)) {
2239 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2240 return JNI_ENOMEM;
2241 }
2242 } else if (match_option(option, "--add-exports=", &tail)) {
2243 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2244 return JNI_ENOMEM;
2245 }
2246 } else if (match_option(option, "--add-opens=", &tail)) {
2247 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2248 return JNI_ENOMEM;
2249 }
2250 } else if (match_option(option, "--add-modules=", &tail)) {
2251 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2252 return JNI_ENOMEM;
2253 }
2254 #if INCLUDE_JVMCI
2255 if (!_jvmci_module_added) {
2256 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2257 if (jvmci_module != nullptr) {
2258 char before = *(jvmci_module - 1);
2259 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2260 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2261 FLAG_SET_DEFAULT(EnableJVMCI, true);
2262 _jvmci_module_added = true;
2263 }
2264 }
2265 }
2266 #endif
2267 } else if (match_option(option, "--enable-native-access=", &tail)) {
2268 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2269 return JNI_ENOMEM;
2270 }
2271 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2272 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2273 return JNI_ENOMEM;
2274 }
2275 } else if (match_option(option, "--limit-modules=", &tail)) {
2276 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2277 return JNI_ENOMEM;
2278 }
2279 } else if (match_option(option, "--module-path=", &tail)) {
2280 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2281 return JNI_ENOMEM;
2282 }
2283 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2284 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2285 return JNI_ENOMEM;
2286 }
2287 } else if (match_option(option, "--patch-module=", &tail)) {
2288 // --patch-module=<module>=<file>(<pathsep><file>)*
2289 int res = process_patch_mod_option(tail);
2290 if (res != JNI_OK) {
2291 return res;
2292 }
2293 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2294 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2295 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2296 AddProperty, WriteableProperty, InternalProperty);
2297 } else {
2298 jio_fprintf(defaultStream::error_stream(),
2299 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2300 return JNI_ERR;
2301 }
2302 } else if (match_option(option, "--illegal-access=", &tail)) {
2303 char version[256];
2304 JDK_Version::jdk(17).to_string(version, sizeof(version));
2305 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2306 // -agentlib and -agentpath
2307 } else if (match_option(option, "-agentlib:", &tail) ||
2308 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2309 if(tail != nullptr) {
2310 const char* pos = strchr(tail, '=');
2311 char* name;
2312 if (pos == nullptr) {
2313 name = os::strdup_check_oom(tail, mtArguments);
2314 } else {
2315 size_t len = pos - tail;
2316 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2317 memcpy(name, tail, len);
2318 name[len] = '\0';
2319 }
2320
2321 char *options = nullptr;
2322 if(pos != nullptr) {
2323 options = os::strdup_check_oom(pos + 1, mtArguments);
2324 }
2325 #if !INCLUDE_JVMTI
2326 if (valid_jdwp_agent(name, is_absolute_path)) {
2327 jio_fprintf(defaultStream::error_stream(),
2328 "Debugging agents are not supported in this VM\n");
2329 return JNI_ERR;
2330 }
2331 #elif INCLUDE_CDS
2332 if (valid_jdwp_agent(name, is_absolute_path)) {
2333 _has_jdwp_agent = true;
2334 }
2335 #endif // !INCLUDE_JVMTI
2336 JvmtiAgentList::add(name, options, is_absolute_path);
2337 os::free(name);
2338 os::free(options);
2339 }
2340 // -javaagent
2341 } else if (match_option(option, "-javaagent:", &tail)) {
2342 #if !INCLUDE_JVMTI
2343 jio_fprintf(defaultStream::error_stream(),
2344 "Instrumentation agents are not supported in this VM\n");
2345 return JNI_ERR;
2346 #else
2347 if (tail != nullptr) {
2348 size_t length = strlen(tail) + 1;
2349 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2350 jio_snprintf(options, length, "%s", tail);
2351 JvmtiAgentList::add("instrument", options, false);
2352 FREE_C_HEAP_ARRAY(char, options);
2353
2354 // java agents need module java.instrument
2355 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2356 return JNI_ENOMEM;
2357 }
2358 }
2359 #endif // !INCLUDE_JVMTI
2360 // --enable_preview
2361 } else if (match_option(option, "--enable-preview")) {
2362 set_enable_preview();
2363 // -Xnoclassgc
2364 } else if (match_option(option, "-Xnoclassgc")) {
2365 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2366 return JNI_EINVAL;
2367 }
2368 // -Xbatch
2369 } else if (match_option(option, "-Xbatch")) {
2370 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2371 return JNI_EINVAL;
2372 }
2373 // -Xmn for compatibility with other JVM vendors
2374 } else if (match_option(option, "-Xmn", &tail)) {
2375 julong long_initial_young_size = 0;
2376 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2377 if (errcode != arg_in_range) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Invalid initial young generation size: %s\n", option->optionString);
2380 describe_range_error(errcode);
2381 return JNI_EINVAL;
2382 }
2383 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2384 return JNI_EINVAL;
2385 }
2386 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2387 return JNI_EINVAL;
2388 }
2389 // -Xms
2390 } else if (match_option(option, "-Xms", &tail)) {
2391 julong size = 0;
2392 // an initial heap size of 0 means automatically determine
2393 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2394 if (errcode != arg_in_range) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "Invalid initial heap size: %s\n", option->optionString);
2397 describe_range_error(errcode);
2398 return JNI_EINVAL;
2399 }
2400 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2401 return JNI_EINVAL;
2402 }
2403 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2404 return JNI_EINVAL;
2405 }
2406 // -Xmx
2407 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2408 julong long_max_heap_size = 0;
2409 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2410 if (errcode != arg_in_range) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Invalid maximum heap size: %s\n", option->optionString);
2413 describe_range_error(errcode);
2414 return JNI_EINVAL;
2415 }
2416 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2417 return JNI_EINVAL;
2418 }
2419 // Xmaxf
2420 } else if (match_option(option, "-Xmaxf", &tail)) {
2421 char* err;
2422 int maxf = (int)(strtod(tail, &err) * 100);
2423 if (*err != '\0' || *tail == '\0') {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Bad max heap free percentage size: %s\n",
2426 option->optionString);
2427 return JNI_EINVAL;
2428 } else {
2429 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 }
2433 // Xminf
2434 } else if (match_option(option, "-Xminf", &tail)) {
2435 char* err;
2436 int minf = (int)(strtod(tail, &err) * 100);
2437 if (*err != '\0' || *tail == '\0') {
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Bad min heap free percentage size: %s\n",
2440 option->optionString);
2441 return JNI_EINVAL;
2442 } else {
2443 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2444 return JNI_EINVAL;
2445 }
2446 }
2447 // -Xss
2448 } else if (match_option(option, "-Xss", &tail)) {
2449 intx value = 0;
2450 jint err = parse_xss(option, tail, &value);
2451 if (err != JNI_OK) {
2452 return err;
2453 }
2454 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2455 return JNI_EINVAL;
2456 }
2457 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2458 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2459 julong long_ReservedCodeCacheSize = 0;
2460
2461 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2462 if (errcode != arg_in_range) {
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Invalid maximum code cache size: %s.\n", option->optionString);
2465 return JNI_EINVAL;
2466 }
2467 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2468 return JNI_EINVAL;
2469 }
2470 // -green
2471 } else if (match_option(option, "-green")) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Green threads support not available\n");
2474 return JNI_EINVAL;
2475 // -native
2476 } else if (match_option(option, "-native")) {
2477 // HotSpot always uses native threads, ignore silently for compatibility
2478 // -Xrs
2479 } else if (match_option(option, "-Xrs")) {
2480 // Classic/EVM option, new functionality
2481 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2482 return JNI_EINVAL;
2483 }
2484 // -Xprof
2485 } else if (match_option(option, "-Xprof")) {
2486 char version[256];
2487 // Obsolete in JDK 10
2488 JDK_Version::jdk(10).to_string(version, sizeof(version));
2489 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2490 // -Xinternalversion
2491 } else if (match_option(option, "-Xinternalversion")) {
2492 jio_fprintf(defaultStream::output_stream(), "%s\n",
2493 VM_Version::internal_vm_info_string());
2494 vm_exit(0);
2495 #ifndef PRODUCT
2496 // -Xprintflags
2497 } else if (match_option(option, "-Xprintflags")) {
2498 JVMFlag::printFlags(tty, false);
2499 vm_exit(0);
2500 #endif
2501 // -D
2502 } else if (match_option(option, "-D", &tail)) {
2503 const char* value;
2504 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2505 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2506 // abort if -Djava.endorsed.dirs is set
2507 jio_fprintf(defaultStream::output_stream(),
2508 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2509 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2510 return JNI_EINVAL;
2511 }
2512 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2513 *value != '\0' && strcmp(value, "\"\"") != 0) {
2514 // abort if -Djava.ext.dirs is set
2515 jio_fprintf(defaultStream::output_stream(),
2516 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2517 return JNI_EINVAL;
2518 }
2519 // Check for module related properties. They must be set using the modules
2520 // options. For example: use "--add-modules=java.sql", not
2521 // "-Djdk.module.addmods=java.sql"
2522 if (is_internal_module_property(option->optionString + 2)) {
2523 needs_module_property_warning = true;
2524 continue;
2525 }
2526 if (!add_property(tail)) {
2527 return JNI_ENOMEM;
2528 }
2529 // Out of the box management support
2530 if (match_option(option, "-Dcom.sun.management", &tail)) {
2531 #if INCLUDE_MANAGEMENT
2532 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2533 return JNI_EINVAL;
2534 }
2535 // management agent in module jdk.management.agent
2536 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2537 return JNI_ENOMEM;
2538 }
2539 #else
2540 jio_fprintf(defaultStream::output_stream(),
2541 "-Dcom.sun.management is not supported in this VM.\n");
2542 return JNI_ERR;
2543 #endif
2544 }
2545 // -Xint
2546 } else if (match_option(option, "-Xint")) {
2547 set_mode_flags(_int);
2548 mode_flag_cmd_line = true;
2549 // -Xmixed
2550 } else if (match_option(option, "-Xmixed")) {
2551 set_mode_flags(_mixed);
2552 mode_flag_cmd_line = true;
2553 // -Xcomp
2554 } else if (match_option(option, "-Xcomp")) {
2555 // for testing the compiler; turn off all flags that inhibit compilation
2556 set_mode_flags(_comp);
2557 mode_flag_cmd_line = true;
2558 // -Xshare:dump
2559 } else if (match_option(option, "-Xshare:dump")) {
2560 CDSConfig::enable_dumping_static_archive();
2561 CDSConfig::set_old_cds_flags_used();
2562 // -Xshare:on
2563 } else if (match_option(option, "-Xshare:on")) {
2564 UseSharedSpaces = true;
2565 RequireSharedSpaces = true;
2566 CDSConfig::set_old_cds_flags_used();
2567 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2568 } else if (match_option(option, "-Xshare:auto")) {
2569 UseSharedSpaces = true;
2570 RequireSharedSpaces = false;
2571 xshare_auto_cmd_line = true;
2572 CDSConfig::set_old_cds_flags_used();
2573 // -Xshare:off
2574 } else if (match_option(option, "-Xshare:off")) {
2575 UseSharedSpaces = false;
2576 RequireSharedSpaces = false;
2577 CDSConfig::set_old_cds_flags_used();
2578 // -Xverify
2579 } else if (match_option(option, "-Xverify", &tail)) {
2580 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2581 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2582 return JNI_EINVAL;
2583 }
2584 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 } else if (strcmp(tail, ":remote") == 0) {
2588 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2589 return JNI_EINVAL;
2590 }
2591 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 } else if (strcmp(tail, ":none") == 0) {
2595 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2602 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2603 return JNI_EINVAL;
2604 }
2605 // -Xdebug
2606 } else if (match_option(option, "-Xdebug")) {
2607 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2608 } else if (match_option(option, "-Xloggc:", &tail)) {
2609 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2610 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2611 _legacyGCLogging.lastFlag = 2;
2612 _legacyGCLogging.file = os::strdup_check_oom(tail);
2613 } else if (match_option(option, "-Xlog", &tail)) {
2614 bool ret = false;
2615 if (strcmp(tail, ":help") == 0) {
2616 fileStream stream(defaultStream::output_stream());
2617 LogConfiguration::print_command_line_help(&stream);
2618 vm_exit(0);
2619 } else if (strcmp(tail, ":disable") == 0) {
2620 LogConfiguration::disable_logging();
2621 ret = true;
2622 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2623 const char* async_tail = tail + strlen(":async");
2624 ret = LogConfiguration::parse_async_argument(async_tail);
2625 } else if (*tail == '\0') {
2626 ret = LogConfiguration::parse_command_line_arguments();
2627 assert(ret, "-Xlog without arguments should never fail to parse");
2628 } else if (*tail == ':') {
2629 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2630 }
2631 if (ret == false) {
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2634 tail);
2635 return JNI_EINVAL;
2636 }
2637 // JNI hooks
2638 } else if (match_option(option, "-Xcheck", &tail)) {
2639 if (!strcmp(tail, ":jni")) {
2640 #if !INCLUDE_JNI_CHECK
2641 warning("JNI CHECKING is not supported in this VM");
2642 #else
2643 CheckJNICalls = true;
2644 #endif // INCLUDE_JNI_CHECK
2645 } else if (is_bad_option(option, args->ignoreUnrecognized,
2646 "check")) {
2647 return JNI_EINVAL;
2648 }
2649 } else if (match_option(option, "vfprintf")) {
2650 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2651 } else if (match_option(option, "exit")) {
2652 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2653 } else if (match_option(option, "abort")) {
2654 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2655 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2656 // and the last option wins.
2657 } else if (match_option(option, "-XX:+NeverTenure")) {
2658 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2662 return JNI_EINVAL;
2663 }
2664 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2665 return JNI_EINVAL;
2666 }
2667 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2668 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2672 return JNI_EINVAL;
2673 }
2674 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2678 uint max_tenuring_thresh = 0;
2679 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2680 jio_fprintf(defaultStream::error_stream(),
2681 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2682 return JNI_EINVAL;
2683 }
2684
2685 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688
2689 if (MaxTenuringThreshold == 0) {
2690 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 } else {
2697 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 }
2704 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2705 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2712 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2719 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2726 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2730 return JNI_EINVAL;
2731 }
2732 } else if (match_option(option, "--finalization=", &tail)) {
2733 if (strcmp(tail, "enabled") == 0) {
2734 InstanceKlass::set_finalization_enabled(true);
2735 } else if (strcmp(tail, "disabled") == 0) {
2736 InstanceKlass::set_finalization_enabled(false);
2737 } else {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2740 tail);
2741 return JNI_EINVAL;
2742 }
2743 #if !defined(DTRACE_ENABLED)
2744 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "DTraceMethodProbes flag is not applicable for this configuration\n");
2747 return JNI_EINVAL;
2748 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "DTraceAllocProbes flag is not applicable for this configuration\n");
2751 return JNI_EINVAL;
2752 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2753 jio_fprintf(defaultStream::error_stream(),
2754 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2755 return JNI_EINVAL;
2756 #endif // !defined(DTRACE_ENABLED)
2757 #ifdef ASSERT
2758 } else if (match_option(option, "-XX:+FullGCALot")) {
2759 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 #endif
2763 #if !INCLUDE_MANAGEMENT
2764 } else if (match_option(option, "-XX:+ManagementServer")) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "ManagementServer is not supported in this VM.\n");
2767 return JNI_ERR;
2768 #endif // INCLUDE_MANAGEMENT
2769 #if INCLUDE_JVMCI
2770 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2771 if (EnableJVMCIProduct) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2774 return JNI_EINVAL;
2775 }
2776 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2777 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2778 if (use_graal_jit) {
2779 const char* jvmci_compiler = get_property("jvmci.Compiler");
2780 if (jvmci_compiler != nullptr) {
2781 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2784 return JNI_ERR;
2785 }
2786 } else if (!add_property("jvmci.Compiler=graal")) {
2787 return JNI_ENOMEM;
2788 }
2789 }
2790
2791 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2792 if (EnableJVMCIProduct) {
2793 continue;
2794 }
2795 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2796 // Allow this flag if it has been unlocked.
2797 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2798 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "Unable to enable JVMCI in product mode\n");
2801 return JNI_ERR;
2802 }
2803 }
2804 // The flag was locked so process normally to report that error
2805 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2806 return JNI_EINVAL;
2807 }
2808 #endif // INCLUDE_JVMCI
2809 #if INCLUDE_JFR
2810 } else if (match_jfr_option(&option)) {
2811 return JNI_EINVAL;
2812 #endif
2813 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2814 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2815 // already been handled
2816 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2817 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2818 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2819 return JNI_EINVAL;
2820 }
2821 }
2822 // Unknown option
2823 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2824 return JNI_ERR;
2825 }
2826 }
2827
2828 // PrintSharedArchiveAndExit will turn on
2829 // -Xshare:on
2830 // -Xlog:class+path=info
2831 if (PrintSharedArchiveAndExit) {
2832 UseSharedSpaces = true;
2833 RequireSharedSpaces = true;
2834 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2835 }
2836
2837 fix_appclasspath();
2838
2839 return JNI_OK;
2840 }
2841
2842 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2843 // For java.base check for duplicate --patch-module options being specified on the command line.
2844 // This check is only required for java.base, all other duplicate module specifications
2845 // will be checked during module system initialization. The module system initialization
2846 // will throw an ExceptionInInitializerError if this situation occurs.
2847 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2848 if (patch_mod_javabase) {
2849 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2850 } else {
2851 patch_mod_javabase = true;
2852 }
2853 }
2854
2855 // Create GrowableArray lazily, only if --patch-module has been specified
2856 if (_patch_mod_prefix == nullptr) {
2857 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2858 }
2859
2860 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2861 }
2862
2863 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2864 //
2865 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2866 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2867 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2868 // path is treated as the current directory.
2869 //
2870 // This causes problems with CDS, which requires that all directories specified in the classpath
2871 // must be empty. In most cases, applications do NOT want to load classes from the current
2872 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2873 // scripts compatible with CDS.
2874 void Arguments::fix_appclasspath() {
2875 if (IgnoreEmptyClassPaths) {
2876 const char separator = *os::path_separator();
2877 const char* src = _java_class_path->value();
2878
2879 // skip over all the leading empty paths
2880 while (*src == separator) {
2881 src ++;
2882 }
2883
2884 char* copy = os::strdup_check_oom(src, mtArguments);
2885
2886 // trim all trailing empty paths
2887 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2888 *tail = '\0';
2889 }
2890
2891 char from[3] = {separator, separator, '\0'};
2892 char to [2] = {separator, '\0'};
2893 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2894 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2895 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2896 }
2897
2898 _java_class_path->set_writeable_value(copy);
2899 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2900 }
2901 }
2902
2903 jint Arguments::finalize_vm_init_args() {
2904 // check if the default lib/endorsed directory exists; if so, error
2905 char path[JVM_MAXPATHLEN];
2906 const char* fileSep = os::file_separator();
2907 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2908
2909 DIR* dir = os::opendir(path);
2910 if (dir != nullptr) {
2911 jio_fprintf(defaultStream::output_stream(),
2912 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2913 "in modular form will be supported via the concept of upgradeable modules.\n");
2914 os::closedir(dir);
2915 return JNI_ERR;
2916 }
2917
2918 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2919 dir = os::opendir(path);
2920 if (dir != nullptr) {
2921 jio_fprintf(defaultStream::output_stream(),
2922 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2923 "Use -classpath instead.\n.");
2924 os::closedir(dir);
2925 return JNI_ERR;
2926 }
2927
2928 // This must be done after all arguments have been processed
2929 // and the container support has been initialized since AggressiveHeap
2930 // relies on the amount of total memory available.
2931 if (AggressiveHeap) {
2932 jint result = set_aggressive_heap_flags();
2933 if (result != JNI_OK) {
2934 return result;
2935 }
2936 }
2937
2938 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2939 // but like -Xint, leave compilation thresholds unaffected.
2940 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2941 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2942 set_mode_flags(_int);
2943 }
2944
2945 #ifdef ZERO
2946 // Zero always runs in interpreted mode
2947 set_mode_flags(_int);
2948 #endif
2949
2950 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2951 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2952 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2953 }
2954
2955 #if !COMPILER2_OR_JVMCI
2956 // Don't degrade server performance for footprint
2957 if (FLAG_IS_DEFAULT(UseLargePages) &&
2958 MaxHeapSize < LargePageHeapSizeThreshold) {
2959 // No need for large granularity pages w/small heaps.
2960 // Note that large pages are enabled/disabled for both the
2961 // Java heap and the code cache.
2962 FLAG_SET_DEFAULT(UseLargePages, false);
2963 }
2964
2965 UNSUPPORTED_OPTION(ProfileInterpreter);
2966 #endif
2967
2968 // Parse the CompilationMode flag
2969 if (!CompilationModeFlag::initialize()) {
2970 return JNI_ERR;
2971 }
2972
2973 if (!check_vm_args_consistency()) {
2974 return JNI_ERR;
2975 }
2976
2977
2978 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2979 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2980 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2981
2982 return JNI_OK;
2983 }
2984
2985 // Helper class for controlling the lifetime of JavaVMInitArgs
2986 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2987 // deleted on the destruction of the ScopedVMInitArgs object.
2988 class ScopedVMInitArgs : public StackObj {
2989 private:
2990 JavaVMInitArgs _args;
2991 char* _container_name;
2992 bool _is_set;
2993 char* _vm_options_file_arg;
2994
2995 public:
2996 ScopedVMInitArgs(const char *container_name) {
2997 _args.version = JNI_VERSION_1_2;
2998 _args.nOptions = 0;
2999 _args.options = nullptr;
3000 _args.ignoreUnrecognized = false;
3001 _container_name = (char *)container_name;
3002 _is_set = false;
3003 _vm_options_file_arg = nullptr;
3004 }
3005
3006 // Populates the JavaVMInitArgs object represented by this
3007 // ScopedVMInitArgs object with the arguments in options. The
3008 // allocated memory is deleted by the destructor. If this method
3009 // returns anything other than JNI_OK, then this object is in a
3010 // partially constructed state, and should be abandoned.
3011 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3012 _is_set = true;
3013 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3014 JavaVMOption, options->length(), mtArguments);
3015 if (options_arr == nullptr) {
3016 return JNI_ENOMEM;
3017 }
3018 _args.options = options_arr;
3019
3020 for (int i = 0; i < options->length(); i++) {
3021 options_arr[i] = options->at(i);
3022 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3023 if (options_arr[i].optionString == nullptr) {
3024 // Rely on the destructor to do cleanup.
3025 _args.nOptions = i;
3026 return JNI_ENOMEM;
3027 }
3028 }
3029
3030 _args.nOptions = options->length();
3031 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3032 return JNI_OK;
3033 }
3034
3035 JavaVMInitArgs* get() { return &_args; }
3036 char* container_name() { return _container_name; }
3037 bool is_set() { return _is_set; }
3038 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3039 char* vm_options_file_arg() { return _vm_options_file_arg; }
3040
3041 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3042 if (_vm_options_file_arg != nullptr) {
3043 os::free(_vm_options_file_arg);
3044 }
3045 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3046 }
3047
3048 ~ScopedVMInitArgs() {
3049 if (_vm_options_file_arg != nullptr) {
3050 os::free(_vm_options_file_arg);
3051 }
3052 if (_args.options == nullptr) return;
3053 for (int i = 0; i < _args.nOptions; i++) {
3054 os::free(_args.options[i].optionString);
3055 }
3056 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3057 }
3058
3059 // Insert options into this option list, to replace option at
3060 // vm_options_file_pos (-XX:VMOptionsFile)
3061 jint insert(const JavaVMInitArgs* args,
3062 const JavaVMInitArgs* args_to_insert,
3063 const int vm_options_file_pos) {
3064 assert(_args.options == nullptr, "shouldn't be set yet");
3065 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3066 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3067
3068 int length = args->nOptions + args_to_insert->nOptions - 1;
3069 // Construct new option array
3070 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3071 for (int i = 0; i < args->nOptions; i++) {
3072 if (i == vm_options_file_pos) {
3073 // insert the new options starting at the same place as the
3074 // -XX:VMOptionsFile option
3075 for (int j = 0; j < args_to_insert->nOptions; j++) {
3076 options.push(args_to_insert->options[j]);
3077 }
3078 } else {
3079 options.push(args->options[i]);
3080 }
3081 }
3082 // make into options array
3083 return set_args(&options);
3084 }
3085 };
3086
3087 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3088 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3089 }
3090
3091 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3092 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3093 }
3094
3095 jint Arguments::parse_options_environment_variable(const char* name,
3096 ScopedVMInitArgs* vm_args) {
3097 char *buffer = ::getenv(name);
3098
3099 // Don't check this environment variable if user has special privileges
3100 // (e.g. unix su command).
3101 if (buffer == nullptr || os::have_special_privileges()) {
3102 return JNI_OK;
3103 }
3104
3105 if ((buffer = os::strdup(buffer)) == nullptr) {
3106 return JNI_ENOMEM;
3107 }
3108
3109 jio_fprintf(defaultStream::error_stream(),
3110 "Picked up %s: %s\n", name, buffer);
3111
3112 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3113
3114 os::free(buffer);
3115 return retcode;
3116 }
3117
3118 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3119 // read file into buffer
3120 int fd = ::open(file_name, O_RDONLY);
3121 if (fd < 0) {
3122 jio_fprintf(defaultStream::error_stream(),
3123 "Could not open options file '%s'\n",
3124 file_name);
3125 return JNI_ERR;
3126 }
3127
3128 struct stat stbuf;
3129 int retcode = os::stat(file_name, &stbuf);
3130 if (retcode != 0) {
3131 jio_fprintf(defaultStream::error_stream(),
3132 "Could not stat options file '%s'\n",
3133 file_name);
3134 ::close(fd);
3135 return JNI_ERR;
3136 }
3137
3138 if (stbuf.st_size == 0) {
3139 // tell caller there is no option data and that is ok
3140 ::close(fd);
3141 return JNI_OK;
3142 }
3143
3144 // '+ 1' for null termination even with max bytes
3145 size_t bytes_alloc = stbuf.st_size + 1;
3146
3147 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3148 if (nullptr == buf) {
3149 jio_fprintf(defaultStream::error_stream(),
3150 "Could not allocate read buffer for options file parse\n");
3151 ::close(fd);
3152 return JNI_ENOMEM;
3153 }
3154
3155 memset(buf, 0, bytes_alloc);
3156
3157 // Fill buffer
3158 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3159 ::close(fd);
3160 if (bytes_read < 0) {
3161 FREE_C_HEAP_ARRAY(char, buf);
3162 jio_fprintf(defaultStream::error_stream(),
3163 "Could not read options file '%s'\n", file_name);
3164 return JNI_ERR;
3165 }
3166
3167 if (bytes_read == 0) {
3168 // tell caller there is no option data and that is ok
3169 FREE_C_HEAP_ARRAY(char, buf);
3170 return JNI_OK;
3171 }
3172
3173 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3174
3175 FREE_C_HEAP_ARRAY(char, buf);
3176 return retcode;
3177 }
3178
3179 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3180 // Construct option array
3181 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3182
3183 // some pointers to help with parsing
3184 char *buffer_end = buffer + buf_len;
3185 char *opt_hd = buffer;
3186 char *wrt = buffer;
3187 char *rd = buffer;
3188
3189 // parse all options
3190 while (rd < buffer_end) {
3191 // skip leading white space from the input string
3192 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3193 rd++;
3194 }
3195
3196 if (rd >= buffer_end) {
3197 break;
3198 }
3199
3200 // Remember this is where we found the head of the token.
3201 opt_hd = wrt;
3202
3203 // Tokens are strings of non white space characters separated
3204 // by one or more white spaces.
3205 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3206 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3207 int quote = *rd; // matching quote to look for
3208 rd++; // don't copy open quote
3209 while (rd < buffer_end && *rd != quote) {
3210 // include everything (even spaces)
3211 // up until the close quote
3212 *wrt++ = *rd++; // copy to option string
3213 }
3214
3215 if (rd < buffer_end) {
3216 rd++; // don't copy close quote
3217 } else {
3218 // did not see closing quote
3219 jio_fprintf(defaultStream::error_stream(),
3220 "Unmatched quote in %s\n", name);
3221 return JNI_ERR;
3222 }
3223 } else {
3224 *wrt++ = *rd++; // copy to option string
3225 }
3226 }
3227
3228 // steal a white space character and set it to null
3229 *wrt++ = '\0';
3230 // We now have a complete token
3231
3232 JavaVMOption option;
3233 option.optionString = opt_hd;
3234 option.extraInfo = nullptr;
3235
3236 options.append(option); // Fill in option
3237
3238 rd++; // Advance to next character
3239 }
3240
3241 // Fill out JavaVMInitArgs structure.
3242 return vm_args->set_args(&options);
3243 }
3244
3245 #ifndef PRODUCT
3246 // Determine whether LogVMOutput should be implicitly turned on.
3247 static bool use_vm_log() {
3248 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3249 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3250 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3251 PrintAssembly || TraceDeoptimization ||
3252 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3253 return true;
3254 }
3255
3256 #ifdef COMPILER1
3257 if (PrintC1Statistics) {
3258 return true;
3259 }
3260 #endif // COMPILER1
3261
3262 #ifdef COMPILER2
3263 if (PrintOptoAssembly || PrintOptoStatistics) {
3264 return true;
3265 }
3266 #endif // COMPILER2
3267
3268 return false;
3269 }
3270
3271 #endif // PRODUCT
3272
3273 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3274 for (int index = 0; index < args->nOptions; index++) {
3275 const JavaVMOption* option = args->options + index;
3276 const char* tail;
3277 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3278 return true;
3279 }
3280 }
3281 return false;
3282 }
3283
3284 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3285 const char* vm_options_file,
3286 const int vm_options_file_pos,
3287 ScopedVMInitArgs* vm_options_file_args,
3288 ScopedVMInitArgs* args_out) {
3289 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3290 if (code != JNI_OK) {
3291 return code;
3292 }
3293
3294 if (vm_options_file_args->get()->nOptions < 1) {
3295 return JNI_OK;
3296 }
3297
3298 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3299 jio_fprintf(defaultStream::error_stream(),
3300 "A VM options file may not refer to a VM options file. "
3301 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3302 "options file '%s' in options container '%s' is an error.\n",
3303 vm_options_file_args->vm_options_file_arg(),
3304 vm_options_file_args->container_name());
3305 return JNI_EINVAL;
3306 }
3307
3308 return args_out->insert(args, vm_options_file_args->get(),
3309 vm_options_file_pos);
3310 }
3311
3312 // Expand -XX:VMOptionsFile found in args_in as needed.
3313 // mod_args and args_out parameters may return values as needed.
3314 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3315 ScopedVMInitArgs* mod_args,
3316 JavaVMInitArgs** args_out) {
3317 jint code = match_special_option_and_act(args_in, mod_args);
3318 if (code != JNI_OK) {
3319 return code;
3320 }
3321
3322 if (mod_args->is_set()) {
3323 // args_in contains -XX:VMOptionsFile and mod_args contains the
3324 // original options from args_in along with the options expanded
3325 // from the VMOptionsFile. Return a short-hand to the caller.
3326 *args_out = mod_args->get();
3327 } else {
3328 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3329 }
3330 return JNI_OK;
3331 }
3332
3333 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3334 ScopedVMInitArgs* args_out) {
3335 // Remaining part of option string
3336 const char* tail;
3337 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3338
3339 for (int index = 0; index < args->nOptions; index++) {
3340 const JavaVMOption* option = args->options + index;
3341 if (match_option(option, "-XX:Flags=", &tail)) {
3342 Arguments::set_jvm_flags_file(tail);
3343 continue;
3344 }
3345 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3346 if (vm_options_file_args.found_vm_options_file_arg()) {
3347 jio_fprintf(defaultStream::error_stream(),
3348 "The option '%s' is already specified in the options "
3349 "container '%s' so the specification of '%s' in the "
3350 "same options container is an error.\n",
3351 vm_options_file_args.vm_options_file_arg(),
3352 vm_options_file_args.container_name(),
3353 option->optionString);
3354 return JNI_EINVAL;
3355 }
3356 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3357 // If there's a VMOptionsFile, parse that
3358 jint code = insert_vm_options_file(args, tail, index,
3359 &vm_options_file_args, args_out);
3360 if (code != JNI_OK) {
3361 return code;
3362 }
3363 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3364 if (args_out->is_set()) {
3365 // The VMOptions file inserted some options so switch 'args'
3366 // to the new set of options, and continue processing which
3367 // preserves "last option wins" semantics.
3368 args = args_out->get();
3369 // The first option from the VMOptionsFile replaces the
3370 // current option. So we back track to process the
3371 // replacement option.
3372 index--;
3373 }
3374 continue;
3375 }
3376 if (match_option(option, "-XX:+PrintVMOptions")) {
3377 PrintVMOptions = true;
3378 continue;
3379 }
3380 if (match_option(option, "-XX:-PrintVMOptions")) {
3381 PrintVMOptions = false;
3382 continue;
3383 }
3384 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3385 IgnoreUnrecognizedVMOptions = true;
3386 continue;
3387 }
3388 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3389 IgnoreUnrecognizedVMOptions = false;
3390 continue;
3391 }
3392 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3393 JVMFlag::printFlags(tty, false);
3394 vm_exit(0);
3395 }
3396
3397 #ifndef PRODUCT
3398 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3399 JVMFlag::printFlags(tty, true);
3400 vm_exit(0);
3401 }
3402 #endif
3403 }
3404 return JNI_OK;
3405 }
3406
3407 static void print_options(const JavaVMInitArgs *args) {
3408 const char* tail;
3409 for (int index = 0; index < args->nOptions; index++) {
3410 const JavaVMOption *option = args->options + index;
3411 if (match_option(option, "-XX:", &tail)) {
3412 logOption(tail);
3413 }
3414 }
3415 }
3416
3417 bool Arguments::handle_deprecated_print_gc_flags() {
3418 if (PrintGC) {
3419 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3420 }
3421 if (PrintGCDetails) {
3422 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3423 }
3424
3425 if (_legacyGCLogging.lastFlag == 2) {
3426 // -Xloggc was used to specify a filename
3427 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3428
3429 LogTarget(Error, logging) target;
3430 LogStream errstream(target);
3431 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3432 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3433 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3434 }
3435 return true;
3436 }
3437
3438 static void apply_debugger_ergo() {
3439 #ifdef ASSERT
3440 if (ReplayCompiles) {
3441 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3442 }
3443
3444 if (UseDebuggerErgo) {
3445 // Turn on sub-flags
3446 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3447 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3448 }
3449
3450 if (UseDebuggerErgo2) {
3451 // Debugging with limited number of CPUs
3452 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3453 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3454 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3455 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3456 }
3457 #endif // ASSERT
3458 }
3459
3460 // Parse entry point called from JNI_CreateJavaVM
3461
3462 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3463 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3464 JVMFlag::check_all_flag_declarations();
3465
3466 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3467 const char* hotspotrc = ".hotspotrc";
3468 bool settings_file_specified = false;
3469 bool needs_hotspotrc_warning = false;
3470 ScopedVMInitArgs initial_vm_options_args("");
3471 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3472 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3473
3474 // Pointers to current working set of containers
3475 JavaVMInitArgs* cur_cmd_args;
3476 JavaVMInitArgs* cur_vm_options_args;
3477 JavaVMInitArgs* cur_java_options_args;
3478 JavaVMInitArgs* cur_java_tool_options_args;
3479
3480 // Containers for modified/expanded options
3481 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3482 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3483 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3484 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3485
3486
3487 jint code =
3488 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3489 if (code != JNI_OK) {
3490 return code;
3491 }
3492
3493 code = parse_java_options_environment_variable(&initial_java_options_args);
3494 if (code != JNI_OK) {
3495 return code;
3496 }
3497
3498 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3499 char *vmoptions = ClassLoader::lookup_vm_options();
3500 if (vmoptions != nullptr) {
3501 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3502 FREE_C_HEAP_ARRAY(char, vmoptions);
3503 if (code != JNI_OK) {
3504 return code;
3505 }
3506 }
3507
3508 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3509 &mod_java_tool_options_args,
3510 &cur_java_tool_options_args);
3511 if (code != JNI_OK) {
3512 return code;
3513 }
3514
3515 code = expand_vm_options_as_needed(initial_cmd_args,
3516 &mod_cmd_args,
3517 &cur_cmd_args);
3518 if (code != JNI_OK) {
3519 return code;
3520 }
3521
3522 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3523 &mod_java_options_args,
3524 &cur_java_options_args);
3525 if (code != JNI_OK) {
3526 return code;
3527 }
3528
3529 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3530 &mod_vm_options_args,
3531 &cur_vm_options_args);
3532 if (code != JNI_OK) {
3533 return code;
3534 }
3535
3536 const char* flags_file = Arguments::get_jvm_flags_file();
3537 settings_file_specified = (flags_file != nullptr);
3538
3539 if (IgnoreUnrecognizedVMOptions) {
3540 cur_cmd_args->ignoreUnrecognized = true;
3541 cur_java_tool_options_args->ignoreUnrecognized = true;
3542 cur_java_options_args->ignoreUnrecognized = true;
3543 }
3544
3545 // Parse specified settings file
3546 if (settings_file_specified) {
3547 if (!process_settings_file(flags_file, true,
3548 cur_cmd_args->ignoreUnrecognized)) {
3549 return JNI_EINVAL;
3550 }
3551 } else {
3552 #ifdef ASSERT
3553 // Parse default .hotspotrc settings file
3554 if (!process_settings_file(".hotspotrc", false,
3555 cur_cmd_args->ignoreUnrecognized)) {
3556 return JNI_EINVAL;
3557 }
3558 #else
3559 struct stat buf;
3560 if (os::stat(hotspotrc, &buf) == 0) {
3561 needs_hotspotrc_warning = true;
3562 }
3563 #endif
3564 }
3565
3566 if (PrintVMOptions) {
3567 print_options(cur_java_tool_options_args);
3568 print_options(cur_cmd_args);
3569 print_options(cur_java_options_args);
3570 }
3571
3572 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3573 jint result = parse_vm_init_args(cur_vm_options_args,
3574 cur_java_tool_options_args,
3575 cur_java_options_args,
3576 cur_cmd_args);
3577
3578 if (result != JNI_OK) {
3579 return result;
3580 }
3581
3582 // Delay warning until here so that we've had a chance to process
3583 // the -XX:-PrintWarnings flag
3584 if (needs_hotspotrc_warning) {
3585 warning("%s file is present but has been ignored. "
3586 "Run with -XX:Flags=%s to load the file.",
3587 hotspotrc, hotspotrc);
3588 }
3589
3590 if (needs_module_property_warning) {
3591 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3592 " names that are reserved for internal use.");
3593 }
3594
3595 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3596 UNSUPPORTED_OPTION(UseLargePages);
3597 #endif
3598
3599 #if defined(AIX)
3600 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3601 #endif
3602
3603 #ifndef PRODUCT
3604 if (TraceBytecodesAt != 0) {
3605 TraceBytecodes = true;
3606 }
3607 #endif // PRODUCT
3608
3609 if (ScavengeRootsInCode == 0) {
3610 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3611 warning("Forcing ScavengeRootsInCode non-zero");
3612 }
3613 ScavengeRootsInCode = 1;
3614 }
3615
3616 if (!handle_deprecated_print_gc_flags()) {
3617 return JNI_EINVAL;
3618 }
3619
3620 // Set object alignment values.
3621 set_object_alignment();
3622
3623 #if !INCLUDE_CDS
3624 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3625 jio_fprintf(defaultStream::error_stream(),
3626 "Shared spaces are not supported in this VM\n");
3627 return JNI_ERR;
3628 }
3629 if (DumpLoadedClassList != nullptr) {
3630 jio_fprintf(defaultStream::error_stream(),
3631 "DumpLoadedClassList is not supported in this VM\n");
3632 return JNI_ERR;
3633 }
3634 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3635 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3636 warning("Shared spaces are not supported in this VM");
3637 UseSharedSpaces = false;
3638 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3639 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3640 }
3641 no_shared_spaces("CDS Disabled");
3642 #endif // INCLUDE_CDS
3643
3644 // Verify NMT arguments
3645 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3646 if (lvl == NMT_unknown) {
3647 jio_fprintf(defaultStream::error_stream(),
3648 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3649 return JNI_ERR;
3650 }
3651 if (PrintNMTStatistics && lvl == NMT_off) {
3652 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3653 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3654 }
3655
3656 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3657 if (trace_dependencies && VerifyDependencies) {
3658 warning("dependency logging results may be inflated by VerifyDependencies");
3659 }
3660
3661 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3662 log_is_enabled(Info, class, load, cause);
3663 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3664 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3665 }
3666
3667 apply_debugger_ergo();
3668
3669 // The VMThread needs to stop now and then to execute these debug options.
3670 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3671 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3672 }
3673
3674 if (log_is_enabled(Info, arguments)) {
3675 LogStream st(Log(arguments)::info());
3676 Arguments::print_on(&st);
3677 }
3678
3679 return JNI_OK;
3680 }
3681
3682 void Arguments::set_compact_headers_flags() {
3683 #ifdef _LP64
3684 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3685 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3686 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3687 }
3688 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3689 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3690 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3691 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3692
3693 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3694 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3695 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3696 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3697 } else {
3698 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3699 }
3700 }
3701 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3702 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3703 }
3704 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3705 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3706 }
3707 #endif
3708 }
3709
3710 jint Arguments::apply_ergo() {
3711 // Set flags based on ergonomics.
3712 jint result = set_ergonomics_flags();
3713 if (result != JNI_OK) return result;
3714
3715 // Set heap size based on available physical memory
3716 set_heap_size();
3717
3718 GCConfig::arguments()->initialize();
3719
3720 set_compact_headers_flags();
3721
3722 if (UseCompressedClassPointers) {
3723 CompressedKlassPointers::pre_initialize();
3724 }
3725
3726 CDSConfig::ergo_initialize();
3727
3728 // Initialize Metaspace flags and alignments
3729 Metaspace::ergo_initialize();
3730
3731 if (!StringDedup::ergo_initialize()) {
3732 return JNI_EINVAL;
3733 }
3734
3735 // Set compiler flags after GC is selected and GC specific
3736 // flags (LoopStripMiningIter) are set.
3737 CompilerConfig::ergo_initialize();
3738
3739 // Set bytecode rewriting flags
3740 set_bytecode_flags();
3741
3742 // Set flags if aggressive optimization flags are enabled
3743 jint code = set_aggressive_opts_flags();
3744 if (code != JNI_OK) {
3745 return code;
3746 }
3747
3748 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3749 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3750 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3751 warning("UseSecondarySupersTable is not supported");
3752 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3753 }
3754 if (!UseSecondarySupersTable) {
3755 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3756 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3757 }
3758
3759 #ifdef ZERO
3760 // Clear flags not supported on zero.
3761 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3762 #endif // ZERO
3763
3764 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3765 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3766 DebugNonSafepoints = true;
3767 }
3768
3769 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3770 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3771 }
3772
3773 // Treat the odd case where local verification is enabled but remote
3774 // verification is not as if both were enabled.
3775 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3776 log_info(verification)("Turning on remote verification because local verification is on");
3777 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3778 }
3779
3780 #ifndef PRODUCT
3781 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3782 if (use_vm_log()) {
3783 LogVMOutput = true;
3784 }
3785 }
3786 #endif // PRODUCT
3787
3788 if (PrintCommandLineFlags) {
3789 JVMFlag::printSetFlags(tty);
3790 }
3791
3792 #if COMPILER2_OR_JVMCI
3793 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3794 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3795 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3796 }
3797 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3798
3799 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3800 if (!EnableVectorReboxing) {
3801 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3802 } else {
3803 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3804 }
3805 }
3806 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3807 }
3808 #endif // COMPILER2_OR_JVMCI
3809
3810 #ifdef COMPILER2
3811 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3812 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3813 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3814 }
3815 #endif // COMPILER2
3816
3817 if (log_is_enabled(Info, perf, class, link)) {
3818 if (!UsePerfData) {
3819 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3820 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3821 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3822 }
3823 }
3824
3825 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3826 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3827 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3828 }
3829 }
3830 return JNI_OK;
3831 }
3832
3833 jint Arguments::adjust_after_os() {
3834 if (UseNUMA) {
3835 if (UseParallelGC) {
3836 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3837 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3838 }
3839 }
3840 }
3841 return JNI_OK;
3842 }
3843
3844 int Arguments::PropertyList_count(SystemProperty* pl) {
3845 int count = 0;
3846 while(pl != nullptr) {
3847 count++;
3848 pl = pl->next();
3849 }
3850 return count;
3851 }
3852
3853 // Return the number of readable properties.
3854 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3855 int count = 0;
3856 while(pl != nullptr) {
3857 if (pl->readable()) {
3858 count++;
3859 }
3860 pl = pl->next();
3861 }
3862 return count;
3863 }
3864
3865 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3866 assert(key != nullptr, "just checking");
3867 SystemProperty* prop;
3868 for (prop = pl; prop != nullptr; prop = prop->next()) {
3869 if (strcmp(key, prop->key()) == 0) return prop->value();
3870 }
3871 return nullptr;
3872 }
3873
3874 // Return the value of the requested property provided that it is a readable property.
3875 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3876 assert(key != nullptr, "just checking");
3877 SystemProperty* prop;
3878 // Return the property value if the keys match and the property is not internal or
3879 // it's the special internal property "jdk.boot.class.path.append".
3880 for (prop = pl; prop != nullptr; prop = prop->next()) {
3881 if (strcmp(key, prop->key()) == 0) {
3882 if (!prop->internal()) {
3883 return prop->value();
3884 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3885 return prop->value();
3886 } else {
3887 // Property is internal and not jdk.boot.class.path.append so return null.
3888 return nullptr;
3889 }
3890 }
3891 }
3892 return nullptr;
3893 }
3894
3895 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3896 SystemProperty* p = *plist;
3897 if (p == nullptr) {
3898 *plist = new_p;
3899 } else {
3900 while (p->next() != nullptr) {
3901 p = p->next();
3902 }
3903 p->set_next(new_p);
3904 }
3905 }
3906
3907 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3908 bool writeable, bool internal) {
3909 if (plist == nullptr)
3910 return;
3911
3912 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3913 PropertyList_add(plist, new_p);
3914 }
3915
3916 void Arguments::PropertyList_add(SystemProperty *element) {
3917 PropertyList_add(&_system_properties, element);
3918 }
3919
3920 // This add maintains unique property key in the list.
3921 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3922 PropertyAppendable append, PropertyWriteable writeable,
3923 PropertyInternal internal) {
3924 if (plist == nullptr)
3925 return;
3926
3927 // If property key exists and is writeable, then update with new value.
3928 // Trying to update a non-writeable property is silently ignored.
3929 SystemProperty* prop;
3930 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3931 if (strcmp(k, prop->key()) == 0) {
3932 if (append == AppendProperty) {
3933 prop->append_writeable_value(v);
3934 } else {
3935 prop->set_writeable_value(v);
3936 }
3937 return;
3938 }
3939 }
3940
3941 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3942 }
3943
3944 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3945 // Returns true if all of the source pointed by src has been copied over to
3946 // the destination buffer pointed by buf. Otherwise, returns false.
3947 // Notes:
3948 // 1. If the length (buflen) of the destination buffer excluding the
3949 // null terminator character is not long enough for holding the expanded
3950 // pid characters, it also returns false instead of returning the partially
3951 // expanded one.
3952 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3953 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3954 char* buf, size_t buflen) {
3955 const char* p = src;
3956 char* b = buf;
3957 const char* src_end = &src[srclen];
3958 char* buf_end = &buf[buflen - 1];
3959
3960 while (p < src_end && b < buf_end) {
3961 if (*p == '%') {
3962 switch (*(++p)) {
3963 case '%': // "%%" ==> "%"
3964 *b++ = *p++;
3965 break;
3966 case 'p': { // "%p" ==> current process id
3967 // buf_end points to the character before the last character so
3968 // that we could write '\0' to the end of the buffer.
3969 size_t buf_sz = buf_end - b + 1;
3970 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3971
3972 // if jio_snprintf fails or the buffer is not long enough to hold
3973 // the expanded pid, returns false.
3974 if (ret < 0 || ret >= (int)buf_sz) {
3975 return false;
3976 } else {
3977 b += ret;
3978 assert(*b == '\0', "fail in copy_expand_pid");
3979 if (p == src_end && b == buf_end + 1) {
3980 // reach the end of the buffer.
3981 return true;
3982 }
3983 }
3984 p++;
3985 break;
3986 }
3987 default :
3988 *b++ = '%';
3989 }
3990 } else {
3991 *b++ = *p++;
3992 }
3993 }
3994 *b = '\0';
3995 return (p == src_end); // return false if not all of the source was copied
3996 }