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