1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objLayout.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/checkedCast.hpp"
67 #include "utilities/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 #include <limits>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 char* Arguments::_java_command = nullptr;
91 SystemProperty* Arguments::_system_properties = nullptr;
92 size_t Arguments::_conservative_max_heap_alignment = 0;
93 Arguments::Mode Arguments::_mode = _mixed;
94 const char* Arguments::_java_vendor_url_bug = nullptr;
95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
96 bool Arguments::_sun_java_launcher_is_altjvm = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
104
105 bool Arguments::_enable_preview = false;
106
107 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
108
109 // These are not set by the JDK's built-in launchers, but they can be set by
110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
111 // JavaVMOption in jni.h.
112 abort_hook_t Arguments::_abort_hook = nullptr;
113 exit_hook_t Arguments::_exit_hook = nullptr;
114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
115
116
117 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
118 SystemProperty *Arguments::_java_library_path = nullptr;
119 SystemProperty *Arguments::_java_home = nullptr;
120 SystemProperty *Arguments::_java_class_path = nullptr;
121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
122 SystemProperty *Arguments::_vm_info = nullptr;
123
124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
125 PathString *Arguments::_boot_class_path = nullptr;
126 bool Arguments::_has_jimage = false;
127
128 char* Arguments::_ext_dirs = nullptr;
129
130 // True if -Xshare:auto option was specified.
131 static bool xshare_auto_cmd_line = false;
132
133 // True if -Xint/-Xmixed/-Xcomp were specified
134 static bool mode_flag_cmd_line = false;
135
136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
137 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
138 if (new_value == nullptr) {
139 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
140 return false;
141 }
142 if (_value != nullptr) {
143 FreeHeap(_value);
144 }
145 _value = new_value;
146 strcpy(_value, value);
147 return true;
148 }
149
150 void PathString::append_value(const char *value) {
151 char *sp;
152 size_t len = 0;
153 if (value != nullptr) {
154 len = strlen(value);
155 if (_value != nullptr) {
156 len += strlen(_value);
157 }
158 sp = AllocateHeap(len+2, mtArguments);
159 assert(sp != nullptr, "Unable to allocate space for new append path value");
160 if (sp != nullptr) {
161 if (_value != nullptr) {
162 strcpy(sp, _value);
163 strcat(sp, os::path_separator());
164 strcat(sp, value);
165 FreeHeap(_value);
166 } else {
167 strcpy(sp, value);
168 }
169 _value = sp;
170 }
171 }
172 }
173
174 PathString::PathString(const char* value) {
175 if (value == nullptr) {
176 _value = nullptr;
177 } else {
178 _value = AllocateHeap(strlen(value)+1, mtArguments);
179 strcpy(_value, value);
180 }
181 }
182
183 PathString::~PathString() {
184 if (_value != nullptr) {
185 FreeHeap(_value);
186 _value = nullptr;
187 }
188 }
189
190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
191 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
192 size_t len = strlen(module_name) + 1;
193 _module_name = AllocateHeap(len, mtInternal);
194 strncpy(_module_name, module_name, len); // copy the trailing null
195 _path = new PathString(path);
196 }
197
198 ModulePatchPath::~ModulePatchPath() {
199 if (_module_name != nullptr) {
200 FreeHeap(_module_name);
201 _module_name = nullptr;
202 }
203 if (_path != nullptr) {
204 delete _path;
205 _path = nullptr;
206 }
207 }
208
209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
210 if (key == nullptr) {
211 _key = nullptr;
212 } else {
213 _key = AllocateHeap(strlen(key)+1, mtArguments);
214 strcpy(_key, key);
215 }
216 _next = nullptr;
217 _internal = internal;
218 _writeable = writeable;
219 }
220
221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
222 // part of the option string.
223 static bool match_option(const JavaVMOption *option, const char* name,
224 const char** tail) {
225 size_t len = strlen(name);
226 if (strncmp(option->optionString, name, len) == 0) {
227 *tail = option->optionString + len;
228 return true;
229 } else {
230 return false;
231 }
232 }
233
234 // Check if 'option' matches 'name'. No "tail" is allowed.
235 static bool match_option(const JavaVMOption *option, const char* name) {
236 const char* tail = nullptr;
237 bool result = match_option(option, name, &tail);
238 if (tail != nullptr && *tail == '\0') {
239 return result;
240 } else {
241 return false;
242 }
243 }
244
245 // Return true if any of the strings in null-terminated array 'names' matches.
246 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
247 // the option must match exactly.
248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
249 bool tail_allowed) {
250 for (/* empty */; *names != nullptr; ++names) {
251 if (match_option(option, *names, tail)) {
252 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
253 return true;
254 }
255 }
256 }
257 return false;
258 }
259
260 #if INCLUDE_JFR
261 static bool _has_jfr_option = false; // is using JFR
262
263 // return true on failure
264 static bool match_jfr_option(const JavaVMOption** option) {
265 assert((*option)->optionString != nullptr, "invariant");
266 char* tail = nullptr;
267 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_start_flight_recording_option(option, tail);
270 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_flight_recorder_option(option, tail);
273 }
274 return false;
275 }
276
277 bool Arguments::has_jfr_option() {
278 return _has_jfr_option;
279 }
280 #endif
281
282 static void logOption(const char* opt) {
283 if (PrintVMOptions) {
284 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
285 }
286 }
287
288 bool needs_module_property_warning = false;
289
290 #define MODULE_PROPERTY_PREFIX "jdk.module."
291 #define MODULE_PROPERTY_PREFIX_LEN 11
292 #define ADDEXPORTS "addexports"
293 #define ADDEXPORTS_LEN 10
294 #define ADDREADS "addreads"
295 #define ADDREADS_LEN 8
296 #define ADDOPENS "addopens"
297 #define ADDOPENS_LEN 8
298 #define PATCH "patch"
299 #define PATCH_LEN 5
300 #define ADDMODS "addmods"
301 #define ADDMODS_LEN 7
302 #define LIMITMODS "limitmods"
303 #define LIMITMODS_LEN 9
304 #define PATH "path"
305 #define PATH_LEN 4
306 #define UPGRADE_PATH "upgrade.path"
307 #define UPGRADE_PATH_LEN 12
308 #define ENABLE_NATIVE_ACCESS "enable.native.access"
309 #define ENABLE_NATIVE_ACCESS_LEN 20
310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
311 #define ILLEGAL_NATIVE_ACCESS_LEN 21
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
324 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
325 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
326 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
327 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
328 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
329 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
330 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
331 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
332 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
333 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
334 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
335 return true;
336 }
337 }
338 return false;
339 }
340
341 bool Arguments::is_add_modules_property(const char* key) {
342 return (strcmp(key, MODULE_PROPERTY_PREFIX ADDMODS) == 0);
343 }
344
345 // Return true if the key matches the --module-path property name ("jdk.module.path").
346 bool Arguments::is_module_path_property(const char* key) {
347 return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
348 }
349
350 // Process java launcher properties.
351 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
352 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
353 // Must do this before setting up other system properties,
354 // as some of them may depend on launcher type.
355 for (int index = 0; index < args->nOptions; index++) {
356 const JavaVMOption* option = args->options + index;
357 const char* tail;
358
359 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
360 process_java_launcher_argument(tail, option->extraInfo);
361 continue;
362 }
363 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
364 if (strcmp(tail, "true") == 0) {
365 _sun_java_launcher_is_altjvm = true;
366 }
367 continue;
368 }
369 }
370 }
371
372 // Initialize system properties key and value.
373 void Arguments::init_system_properties() {
374
375 // Set up _boot_class_path which is not a property but
376 // relies heavily on argument processing and the jdk.boot.class.path.append
377 // property. It is used to store the underlying boot class path.
378 _boot_class_path = new PathString(nullptr);
379
380 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
381 "Java Virtual Machine Specification", false));
382 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
383 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
384 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
385
386 // Initialize the vm.info now, but it will need updating after argument parsing.
387 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
388
389 // Following are JVMTI agent writable properties.
390 // Properties values are set to nullptr and they are
391 // os specific they are initialized in os::init_system_properties_values().
392 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
393 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
394 _java_home = new SystemProperty("java.home", nullptr, true);
395 _java_class_path = new SystemProperty("java.class.path", "", true);
396 // jdk.boot.class.path.append is a non-writeable, internal property.
397 // It can only be set by either:
398 // - -Xbootclasspath/a:
399 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
400 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
401
402 // Add to System Property list.
403 PropertyList_add(&_system_properties, _sun_boot_library_path);
404 PropertyList_add(&_system_properties, _java_library_path);
405 PropertyList_add(&_system_properties, _java_home);
406 PropertyList_add(&_system_properties, _java_class_path);
407 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
408 PropertyList_add(&_system_properties, _vm_info);
409
410 // Set OS specific system properties values
411 os::init_system_properties_values();
412 }
413
414 // Update/Initialize System properties after JDK version number is known
415 void Arguments::init_version_specific_system_properties() {
416 enum { bufsz = 16 };
417 char buffer[bufsz];
418 const char* spec_vendor = "Oracle Corporation";
419 uint32_t spec_version = JDK_Version::current().major_version();
420
421 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
422
423 PropertyList_add(&_system_properties,
424 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
425 PropertyList_add(&_system_properties,
426 new SystemProperty("java.vm.specification.version", buffer, false));
427 PropertyList_add(&_system_properties,
428 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
429 }
430
431 /*
432 * -XX argument processing:
433 *
434 * -XX arguments are defined in several places, such as:
435 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
436 * -XX arguments are parsed in parse_argument().
437 * -XX argument bounds checking is done in check_vm_args_consistency().
438 *
439 * Over time -XX arguments may change. There are mechanisms to handle common cases:
440 *
441 * ALIASED: An option that is simply another name for another option. This is often
442 * part of the process of deprecating a flag, but not all aliases need
443 * to be deprecated.
444 *
445 * Create an alias for an option by adding the old and new option names to the
446 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
447 *
448 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
449 * support may be removed in the future. Both regular and aliased options may be
450 * deprecated.
451 *
452 * Add a deprecation warning for an option (or alias) by adding an entry in the
453 * "special_jvm_flags" table and setting the "deprecated_in" field.
454 * Often an option "deprecated" in one major release will
455 * be made "obsolete" in the next. In this case the entry should also have its
456 * "obsolete_in" field set.
457 *
458 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
459 * on the command line. A warning is printed to let the user know that option might not
460 * be accepted in the future.
461 *
462 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
463 * table and setting the "obsolete_in" field.
464 *
465 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
466 * to the current JDK version. The system will flatly refuse to admit the existence of
467 * the flag. This allows a flag to die automatically over JDK releases.
468 *
469 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
470 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
471 * - Newly obsolete or expired deprecated options should have their global variable
472 * definitions removed (from globals.hpp, etc) and related implementations removed.
473 *
474 * Recommended approach for removing options:
475 *
476 * To remove options commonly used by customers (e.g. product -XX options), use
477 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
478 *
479 * To remove internal options (e.g. diagnostic, experimental, develop options), use
480 * a 2-step model adding major release numbers to the obsolete and expire columns.
481 *
482 * To change the name of an option, use the alias table as well as a 2-step
483 * model adding major release numbers to the deprecate and expire columns.
484 * Think twice about aliasing commonly used customer options.
485 *
486 * There are times when it is appropriate to leave a future release number as undefined.
487 *
488 * Tests: Aliases should be tested in VMAliasOptions.java.
489 * Deprecated options should be tested in VMDeprecatedOptions.java.
490 */
491
492 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
493 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
494 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
495 // the command-line as usual, but will issue a warning.
496 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
497 // the command-line, while issuing a warning and ignoring the flag value.
498 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
499 // existence of the flag.
500 //
501 // MANUAL CLEANUP ON JDK VERSION UPDATES:
502 // This table ensures that the handling of options will update automatically when the JDK
503 // version is incremented, but the source code needs to be cleanup up manually:
504 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
505 // variable should be removed, as well as users of the variable.
506 // - As "deprecated" options age into "obsolete" options, move the entry into the
507 // "Obsolete Flags" section of the table.
508 // - All expired options should be removed from the table.
509 static SpecialFlag const special_jvm_flags[] = {
510 // -------------- Deprecated Flags --------------
511 // --- Non-alias flags - sorted by obsolete_in then expired_in:
512 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
515 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
516 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
517 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
518 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
519 #ifdef LINUX
520 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
521 #endif
522 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
523 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
524 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
525
526 // -------------- Obsolete Flags - sorted by expired_in --------------
527
528 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
529 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
530 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
531 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
532 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 #if defined(X86)
535 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
536 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
537 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
538 #endif // X86
539
540
541 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
542 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
543 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
544 #ifdef ASSERT
545 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
546 #endif
547
548 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
549 // These entries will generate build errors. Their purpose is to test the macros.
550 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
551 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
552 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
553 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
554 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
555 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
556 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
557 #endif
558
559 { nullptr, JDK_Version(0), JDK_Version(0) }
560 };
561
562 // Flags that are aliases for other flags.
563 typedef struct {
564 const char* alias_name;
565 const char* real_name;
566 } AliasedFlag;
567
568 static AliasedFlag const aliased_jvm_flags[] = {
569 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
570 { nullptr, nullptr}
571 };
572
573 // Return true if "v" is less than "other", where "other" may be "undefined".
574 static bool version_less_than(JDK_Version v, JDK_Version other) {
575 assert(!v.is_undefined(), "must be defined");
576 if (!other.is_undefined() && v.compare(other) >= 0) {
577 return false;
578 } else {
579 return true;
580 }
581 }
582
583 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
584 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
585 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
586 flag = special_jvm_flags[i];
587 return true;
588 }
589 }
590 return false;
591 }
592
593 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
594 assert(version != nullptr, "Must provide a version buffer");
595 SpecialFlag flag;
596 if (lookup_special_flag(flag_name, flag)) {
597 if (!flag.obsolete_in.is_undefined()) {
598 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
599 *version = flag.obsolete_in;
600 // This flag may have been marked for obsoletion in this version, but we may not
601 // have actually removed it yet. Rather than ignoring it as soon as we reach
602 // this version we allow some time for the removal to happen. So if the flag
603 // still actually exists we process it as normal, but issue an adjusted warning.
604 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
605 if (real_flag != nullptr) {
606 char version_str[256];
607 version->to_string(version_str, sizeof(version_str));
608 warning("Temporarily processing option %s; support is scheduled for removal in %s",
609 flag_name, version_str);
610 return false;
611 }
612 return true;
613 }
614 }
615 }
616 return false;
617 }
618
619 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
620 assert(version != nullptr, "Must provide a version buffer");
621 SpecialFlag flag;
622 if (lookup_special_flag(flag_name, flag)) {
623 if (!flag.deprecated_in.is_undefined()) {
624 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
625 version_less_than(JDK_Version::current(), flag.expired_in)) {
626 *version = flag.deprecated_in;
627 return 1;
628 } else {
629 return -1;
630 }
631 }
632 }
633 return 0;
634 }
635
636 const char* Arguments::real_flag_name(const char *flag_name) {
637 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
638 const AliasedFlag& flag_status = aliased_jvm_flags[i];
639 if (strcmp(flag_status.alias_name, flag_name) == 0) {
640 return flag_status.real_name;
641 }
642 }
643 return flag_name;
644 }
645
646 #ifdef ASSERT
647 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
648 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
649 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
650 return true;
651 }
652 }
653 return false;
654 }
655
656 // Verifies the correctness of the entries in the special_jvm_flags table.
657 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
658 // version being earlier than the deprecation version, then a warning is issued
659 // and verification fails - by returning false. If it is detected that the table
660 // is out of date, with respect to the current version, then ideally a warning is
661 // issued but verification does not fail. This allows the VM to operate when the
662 // version is first updated, without needing to update all the impacted flags at
663 // the same time. In practice we can't issue the warning immediately when the version
664 // is updated as it occurs for every test and some tests are not prepared to handle
665 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
666 // if the check_globals flag is true, and in addition allow a grace period and only
667 // check for stale flags when we hit build 25 (which is far enough into the 6 month
668 // release cycle that all flag updates should have been processed, whilst still
669 // leaving time to make the change before RDP2).
670 // We use a gtest to call this, passing true, so that we can detect stale flags before
671 // the end of the release cycle.
672
673 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
674
675 bool Arguments::verify_special_jvm_flags(bool check_globals) {
676 bool success = true;
677 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
678 const SpecialFlag& flag = special_jvm_flags[i];
679 if (lookup_special_flag(flag.name, i)) {
680 warning("Duplicate special flag declaration \"%s\"", flag.name);
681 success = false;
682 }
683 if (flag.deprecated_in.is_undefined() &&
684 flag.obsolete_in.is_undefined()) {
685 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
686 success = false;
687 }
688
689 if (!flag.deprecated_in.is_undefined()) {
690 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
691 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
692 success = false;
693 }
694
695 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
696 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
697 success = false;
698 }
699 }
700
701 if (!flag.obsolete_in.is_undefined()) {
702 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
703 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
704 success = false;
705 }
706
707 // if flag has become obsolete it should not have a "globals" flag defined anymore.
708 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
709 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
710 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
711 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
712 success = false;
713 }
714 }
715
716 } else if (!flag.expired_in.is_undefined()) {
717 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
718 success = false;
719 }
720
721 if (!flag.expired_in.is_undefined()) {
722 // if flag has become expired it should not have a "globals" flag defined anymore.
723 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
724 !version_less_than(JDK_Version::current(), flag.expired_in)) {
725 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
726 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
727 success = false;
728 }
729 }
730 }
731 }
732 return success;
733 }
734 #endif
735
736 bool Arguments::atojulong(const char *s, julong* result) {
737 return parse_integer(s, result);
738 }
739
740 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
741 if (size < min_size) return arg_too_small;
742 if (size > max_size) return arg_too_big;
743 return arg_in_range;
744 }
745
746 // Describe an argument out of range error
747 void Arguments::describe_range_error(ArgsRange errcode) {
748 switch(errcode) {
749 case arg_too_big:
750 jio_fprintf(defaultStream::error_stream(),
751 "The specified size exceeds the maximum "
752 "representable size.\n");
753 break;
754 case arg_too_small:
755 case arg_unreadable:
756 case arg_in_range:
757 // do nothing for now
758 break;
759 default:
760 ShouldNotReachHere();
761 }
762 }
763
764 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
765 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
766 return true;
767 } else {
768 return false;
769 }
770 }
771
772 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
773 // strtod allows leading whitespace, but our flag format does not.
774 if (*value == '\0' || isspace((unsigned char) *value)) {
775 return false;
776 }
777 char* end;
778 errno = 0;
779 double v = strtod(value, &end);
780 if ((errno != 0) || (*end != 0)) {
781 return false;
782 }
783 if (g_isnan(v) || !g_isfinite(v)) {
784 // Currently we cannot handle these special values.
785 return false;
786 }
787
788 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
789 return true;
790 }
791 return false;
792 }
793
794 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
795 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
796
797 if (flag->is_int()) {
798 int v;
799 if (parse_integer(value, &v)) {
800 result = JVMFlagAccess::set_int(flag, &v, origin);
801 }
802 } else if (flag->is_uint()) {
803 uint v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_uint(flag, &v, origin);
806 }
807 } else if (flag->is_intx()) {
808 intx v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_intx(flag, &v, origin);
811 }
812 } else if (flag->is_uintx()) {
813 uintx v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_uintx(flag, &v, origin);
816 }
817 } else if (flag->is_uint64_t()) {
818 uint64_t v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
821 }
822 } else if (flag->is_size_t()) {
823 size_t v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_size_t(flag, &v, origin);
826 }
827 }
828
829 return result == JVMFlag::SUCCESS;
830 }
831
832 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
833 if (value[0] == '\0') {
834 value = nullptr;
835 }
836 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
837 // Contract: JVMFlag always returns a pointer that needs freeing.
838 FREE_C_HEAP_ARRAY(char, value);
839 return true;
840 }
841
842 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
843 const char* old_value = "";
844 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
845 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
846 size_t new_len = strlen(new_value);
847 const char* value;
848 char* free_this_too = nullptr;
849 if (old_len == 0) {
850 value = new_value;
851 } else if (new_len == 0) {
852 value = old_value;
853 } else {
854 size_t length = old_len + 1 + new_len + 1;
855 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
856 // each new setting adds another LINE to the switch:
857 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
858 value = buf;
859 free_this_too = buf;
860 }
861 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
862 // JVMFlag always returns a pointer that needs freeing.
863 FREE_C_HEAP_ARRAY(char, value);
864 // JVMFlag made its own copy, so I must delete my own temp. buffer.
865 FREE_C_HEAP_ARRAY(char, free_this_too);
866 return true;
867 }
868
869 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
870 const char* real_name = real_flag_name(arg);
871 JDK_Version since = JDK_Version();
872 switch (is_deprecated_flag(arg, &since)) {
873 case -1: {
874 // Obsolete or expired, so don't process normally,
875 // but allow for an obsolete flag we're still
876 // temporarily allowing.
877 if (!is_obsolete_flag(arg, &since)) {
878 return real_name;
879 }
880 // Note if we're not considered obsolete then we can't be expired either
881 // as obsoletion must come first.
882 return nullptr;
883 }
884 case 0:
885 return real_name;
886 case 1: {
887 char version[256];
888 since.to_string(version, sizeof(version));
889 if (real_name != arg) {
890 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
891 arg, version, real_name);
892 } else {
893 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
894 arg, version);
895 }
896 return real_name;
897 }
898 }
899 ShouldNotReachHere();
900 return nullptr;
901 }
902
903 #define BUFLEN 255
904
905 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
906 char name_copied[BUFLEN+1];
907 if (name[name_length] != 0) {
908 if (name_length > BUFLEN) {
909 return nullptr;
910 } else {
911 strncpy(name_copied, name, name_length);
912 name_copied[name_length] = '\0';
913 name = name_copied;
914 }
915 }
916
917 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
918 if (real_name == nullptr) {
919 return nullptr;
920 }
921 JVMFlag* flag = JVMFlag::find_flag(real_name);
922 return flag;
923 }
924
925 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
926 bool is_bool = false;
927 bool bool_val = false;
928 char c = *arg;
929 if (c == '+' || c == '-') {
930 is_bool = true;
931 bool_val = (c == '+');
932 arg++;
933 }
934
935 const char* name = arg;
936 while (true) {
937 c = *arg;
938 if (isalnum(c) || (c == '_')) {
939 ++arg;
940 } else {
941 break;
942 }
943 }
944
945 size_t name_len = size_t(arg - name);
946 if (name_len == 0) {
947 return false;
948 }
949
950 JVMFlag* flag = find_jvm_flag(name, name_len);
951 if (flag == nullptr) {
952 return false;
953 }
954
955 if (is_bool) {
956 if (*arg != 0) {
957 // Error -- extra characters such as -XX:+BoolFlag=123
958 return false;
959 }
960 return set_bool_flag(flag, bool_val, origin);
961 }
962
963 if (arg[0] == '=') {
964 const char* value = arg + 1;
965 if (flag->is_ccstr()) {
966 if (flag->ccstr_accumulates()) {
967 return append_to_string_flag(flag, value, origin);
968 } else {
969 return set_string_flag(flag, value, origin);
970 }
971 } else if (flag->is_double()) {
972 return set_fp_numeric_flag(flag, value, origin);
973 } else {
974 return set_numeric_flag(flag, value, origin);
975 }
976 }
977
978 if (arg[0] == ':' && arg[1] == '=') {
979 // -XX:Foo:=xxx will reset the string flag to the given value.
980 const char* value = arg + 2;
981 return set_string_flag(flag, value, origin);
982 }
983
984 return false;
985 }
986
987 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
988 assert(bldarray != nullptr, "illegal argument");
989
990 if (arg == nullptr) {
991 return;
992 }
993
994 int new_count = *count + 1;
995
996 // expand the array and add arg to the last element
997 if (*bldarray == nullptr) {
998 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
999 } else {
1000 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1001 }
1002 (*bldarray)[*count] = os::strdup_check_oom(arg);
1003 *count = new_count;
1004 }
1005
1006 void Arguments::build_jvm_args(const char* arg) {
1007 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1008 }
1009
1010 void Arguments::build_jvm_flags(const char* arg) {
1011 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1012 }
1013
1014 // utility function to return a string that concatenates all
1015 // strings in a given char** array
1016 const char* Arguments::build_resource_string(char** args, int count) {
1017 if (args == nullptr || count == 0) {
1018 return nullptr;
1019 }
1020 size_t length = 0;
1021 for (int i = 0; i < count; i++) {
1022 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1023 }
1024 char* s = NEW_RESOURCE_ARRAY(char, length);
1025 char* dst = s;
1026 for (int j = 0; j < count; j++) {
1027 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1028 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1029 dst += offset;
1030 length -= offset;
1031 }
1032 return (const char*) s;
1033 }
1034
1035 void Arguments::print_on(outputStream* st) {
1036 st->print_cr("VM Arguments:");
1037 if (num_jvm_flags() > 0) {
1038 st->print("jvm_flags: "); print_jvm_flags_on(st);
1039 st->cr();
1040 }
1041 if (num_jvm_args() > 0) {
1042 st->print("jvm_args: "); print_jvm_args_on(st);
1043 st->cr();
1044 }
1045 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1046 if (_java_class_path != nullptr) {
1047 char* path = _java_class_path->value();
1048 size_t len = strlen(path);
1049 st->print("java_class_path (initial): ");
1050 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1051 if (len == 0) {
1052 st->print_raw_cr("<not set>");
1053 } else {
1054 st->print_raw_cr(path, len);
1055 }
1056 }
1057 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1058 }
1059
1060 void Arguments::print_summary_on(outputStream* st) {
1061 // Print the command line. Environment variables that are helpful for
1062 // reproducing the problem are written later in the hs_err file.
1063 // flags are from setting file
1064 if (num_jvm_flags() > 0) {
1065 st->print_raw("Settings File: ");
1066 print_jvm_flags_on(st);
1067 st->cr();
1068 }
1069 // args are the command line and environment variable arguments.
1070 st->print_raw("Command Line: ");
1071 if (num_jvm_args() > 0) {
1072 print_jvm_args_on(st);
1073 }
1074 // this is the classfile and any arguments to the java program
1075 if (java_command() != nullptr) {
1076 st->print("%s", java_command());
1077 }
1078 st->cr();
1079 }
1080
1081 void Arguments::print_jvm_flags_on(outputStream* st) {
1082 if (_num_jvm_flags > 0) {
1083 for (int i=0; i < _num_jvm_flags; i++) {
1084 st->print("%s ", _jvm_flags_array[i]);
1085 }
1086 }
1087 }
1088
1089 void Arguments::print_jvm_args_on(outputStream* st) {
1090 if (_num_jvm_args > 0) {
1091 for (int i=0; i < _num_jvm_args; i++) {
1092 st->print("%s ", _jvm_args_array[i]);
1093 }
1094 }
1095 }
1096
1097 bool Arguments::process_argument(const char* arg,
1098 jboolean ignore_unrecognized,
1099 JVMFlagOrigin origin) {
1100 JDK_Version since = JDK_Version();
1101
1102 if (parse_argument(arg, origin)) {
1103 return true;
1104 }
1105
1106 // Determine if the flag has '+', '-', or '=' characters.
1107 bool has_plus_minus = (*arg == '+' || *arg == '-');
1108 const char* const argname = has_plus_minus ? arg + 1 : arg;
1109
1110 size_t arg_len;
1111 const char* equal_sign = strchr(argname, '=');
1112 if (equal_sign == nullptr) {
1113 arg_len = strlen(argname);
1114 } else {
1115 arg_len = equal_sign - argname;
1116 }
1117
1118 // Only make the obsolete check for valid arguments.
1119 if (arg_len <= BUFLEN) {
1120 // Construct a string which consists only of the argument name without '+', '-', or '='.
1121 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1122 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1123 if (is_obsolete_flag(stripped_argname, &since)) {
1124 char version[256];
1125 since.to_string(version, sizeof(version));
1126 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1127 return true;
1128 }
1129 }
1130
1131 // For locked flags, report a custom error message if available.
1132 // Otherwise, report the standard unrecognized VM option.
1133 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1134 if (found_flag != nullptr) {
1135 char locked_message_buf[BUFLEN];
1136 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1137 if (strlen(locked_message_buf) != 0) {
1138 #ifdef PRODUCT
1139 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1140 if (ignore_unrecognized && mismatched) {
1141 return true;
1142 }
1143 #endif
1144 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1145 }
1146 if (found_flag->is_bool() && !has_plus_minus) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Missing +/- setting for VM option '%s'\n", argname);
1149 } else if (!found_flag->is_bool() && has_plus_minus) {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Unexpected +/- setting in VM option '%s'\n", argname);
1152 } else {
1153 jio_fprintf(defaultStream::error_stream(),
1154 "Improperly specified VM option '%s'\n", argname);
1155 }
1156 } else {
1157 if (ignore_unrecognized) {
1158 return true;
1159 }
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Unrecognized VM option '%s'\n", argname);
1162 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1163 if (fuzzy_matched != nullptr) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "Did you mean '%s%s%s'?\n",
1166 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1167 fuzzy_matched->name(),
1168 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1169 }
1170 }
1171
1172 // allow for commandline "commenting out" options like -XX:#+Verbose
1173 return arg[0] == '#';
1174 }
1175
1176 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1177 FILE* stream = os::fopen(file_name, "rb");
1178 if (stream == nullptr) {
1179 if (should_exist) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Could not open settings file %s\n", file_name);
1182 return false;
1183 } else {
1184 return true;
1185 }
1186 }
1187
1188 char token[1024];
1189 int pos = 0;
1190
1191 bool in_white_space = true;
1192 bool in_comment = false;
1193 bool in_quote = false;
1194 int quote_c = 0;
1195 bool result = true;
1196
1197 int c = getc(stream);
1198 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1199 if (in_white_space) {
1200 if (in_comment) {
1201 if (c == '\n') in_comment = false;
1202 } else {
1203 if (c == '#') in_comment = true;
1204 else if (!isspace((unsigned char) c)) {
1205 in_white_space = false;
1206 token[pos++] = checked_cast<char>(c);
1207 }
1208 }
1209 } else {
1210 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1211 // token ends at newline, or at unquoted whitespace
1212 // this allows a way to include spaces in string-valued options
1213 token[pos] = '\0';
1214 logOption(token);
1215 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216 build_jvm_flags(token);
1217 pos = 0;
1218 in_white_space = true;
1219 in_quote = false;
1220 } else if (!in_quote && (c == '\'' || c == '"')) {
1221 in_quote = true;
1222 quote_c = c;
1223 } else if (in_quote && (c == quote_c)) {
1224 in_quote = false;
1225 } else {
1226 token[pos++] = checked_cast<char>(c);
1227 }
1228 }
1229 c = getc(stream);
1230 }
1231 if (pos > 0) {
1232 token[pos] = '\0';
1233 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1234 build_jvm_flags(token);
1235 }
1236 fclose(stream);
1237 return result;
1238 }
1239
1240 //=============================================================================================================
1241 // Parsing of properties (-D)
1242
1243 const char* Arguments::get_property(const char* key) {
1244 return PropertyList_get_value(system_properties(), key);
1245 }
1246
1247 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1248 const char* eq = strchr(prop, '=');
1249 const char* key;
1250 const char* value = "";
1251
1252 if (eq == nullptr) {
1253 // property doesn't have a value, thus use passed string
1254 key = prop;
1255 } else {
1256 // property have a value, thus extract it and save to the
1257 // allocated string
1258 size_t key_len = eq - prop;
1259 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1260
1261 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1262 key = tmp_key;
1263
1264 value = &prop[key_len + 1];
1265 }
1266
1267 if (internal == ExternalProperty) {
1268 CDSConfig::check_incompatible_property(key, value);
1269 }
1270
1271 if (strcmp(key, "java.compiler") == 0) {
1272 // we no longer support java.compiler system property, log a warning and let it get
1273 // passed to Java, like any other system property
1274 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1275 // for applications using NONE or empty value, log a more informative message
1276 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1277 } else {
1278 warning("The java.compiler system property is obsolete and no longer supported.");
1279 }
1280 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1281 // sun.java.launcher.is_altjvm property is
1282 // private and is processed in process_sun_java_launcher_properties();
1283 // the sun.java.launcher property is passed on to the java application
1284 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1285 // append is true, writable is true, internal is false
1286 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1287 WriteableProperty, ExternalProperty);
1288 } else {
1289 if (strcmp(key, "sun.java.command") == 0) {
1290 char *old_java_command = _java_command;
1291 _java_command = os::strdup_check_oom(value, mtArguments);
1292 if (old_java_command != nullptr) {
1293 os::free(old_java_command);
1294 }
1295 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1296 // If this property is set on the command line then its value will be
1297 // displayed in VM error logs as the URL at which to submit such logs.
1298 // Normally the URL displayed in error logs is different from the value
1299 // of this system property, so a different property should have been
1300 // used here, but we leave this as-is in case someone depends upon it.
1301 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1302 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1303 // its value without going through the property list or making a Java call.
1304 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1305 if (old_java_vendor_url_bug != nullptr) {
1306 os::free((void *)old_java_vendor_url_bug);
1307 }
1308 }
1309
1310 // Create new property and add at the end of the list
1311 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1312 }
1313
1314 if (key != prop) {
1315 // SystemProperty copy passed value, thus free previously allocated
1316 // memory
1317 FreeHeap((void *)key);
1318 }
1319
1320 return true;
1321 }
1322
1323 //===========================================================================================================
1324 // Setting int/mixed/comp mode flags
1325
1326 void Arguments::set_mode_flags(Mode mode) {
1327 // Set up default values for all flags.
1328 // If you add a flag to any of the branches below,
1329 // add a default value for it here.
1330 _mode = mode;
1331
1332 // Ensure Agent_OnLoad has the correct initial values.
1333 // This may not be the final mode; mode may change later in onload phase.
1334 PropertyList_unique_add(&_system_properties, "java.vm.info",
1335 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1336
1337 UseInterpreter = true;
1338 UseCompiler = true;
1339 UseLoopCounter = true;
1340
1341 // Default values may be platform/compiler dependent -
1342 // use the saved values
1343 ClipInlining = Arguments::_ClipInlining;
1344 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1345 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1346 BackgroundCompilation = Arguments::_BackgroundCompilation;
1347
1348 // Change from defaults based on mode
1349 switch (mode) {
1350 default:
1351 ShouldNotReachHere();
1352 break;
1353 case _int:
1354 UseCompiler = false;
1355 UseLoopCounter = false;
1356 AlwaysCompileLoopMethods = false;
1357 UseOnStackReplacement = false;
1358 break;
1359 case _mixed:
1360 // same as default
1361 break;
1362 case _comp:
1363 UseInterpreter = false;
1364 BackgroundCompilation = false;
1365 ClipInlining = false;
1366 break;
1367 }
1368 }
1369
1370 // Conflict: required to use shared spaces (-Xshare:on), but
1371 // incompatible command line options were chosen.
1372 void Arguments::no_shared_spaces(const char* message) {
1373 if (RequireSharedSpaces) {
1374 jio_fprintf(defaultStream::error_stream(),
1375 "Class data sharing is inconsistent with other specified options.\n");
1376 vm_exit_during_initialization("Unable to use shared archive", message);
1377 } else {
1378 log_info(cds)("Unable to use shared archive: %s", message);
1379 UseSharedSpaces = false;
1380 }
1381 }
1382
1383 static void set_object_alignment() {
1384 // Object alignment.
1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391
1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394
1395 // Oop encoding heap max
1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397 }
1398
1399 size_t Arguments::max_heap_for_compressed_oops() {
1400 // Avoid sign flip.
1401 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1402 // We need to fit both the null page and the heap into the memory budget, while
1403 // keeping alignment constraints of the heap. To guarantee the latter, as the
1404 // null page is located before the heap, we pad the null page to the conservative
1405 // maximum alignment that the GC may ever impose upon the heap.
1406 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1407 _conservative_max_heap_alignment);
1408
1409 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1410 NOT_LP64(ShouldNotReachHere(); return 0);
1411 }
1412
1413 void Arguments::set_use_compressed_oops() {
1414 #ifdef _LP64
1415 // MaxHeapSize is not set up properly at this point, but
1416 // the only value that can override MaxHeapSize if we are
1417 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1418 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1419
1420 if (max_heap_size <= max_heap_for_compressed_oops()) {
1421 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1422 FLAG_SET_ERGO(UseCompressedOops, true);
1423 }
1424 } else {
1425 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1426 warning("Max heap size too large for Compressed Oops");
1427 FLAG_SET_DEFAULT(UseCompressedOops, false);
1428 }
1429 }
1430 #endif // _LP64
1431 }
1432
1433 void Arguments::set_conservative_max_heap_alignment() {
1434 // The conservative maximum required alignment for the heap is the maximum of
1435 // the alignments imposed by several sources: any requirements from the heap
1436 // itself and the maximum page size we may run the VM with.
1437 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1438 _conservative_max_heap_alignment = MAX4(heap_alignment,
1439 os::vm_allocation_granularity(),
1440 os::max_page_size(),
1441 GCArguments::compute_heap_alignment());
1442 }
1443
1444 jint Arguments::set_ergonomics_flags() {
1445 GCConfig::initialize();
1446
1447 set_conservative_max_heap_alignment();
1448
1449 #ifdef _LP64
1450 set_use_compressed_oops();
1451
1452 // Also checks that certain machines are slower with compressed oops
1453 // in vm_version initialization code.
1454 #endif // _LP64
1455
1456 return JNI_OK;
1457 }
1458
1459 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1460 size_t max_allocatable;
1461 size_t result = limit;
1462 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1463 // The AggressiveHeap check is a temporary workaround to avoid calling
1464 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1465 // selected. This works because AggressiveHeap implies UseParallelGC
1466 // where we know the ratio will be 1. Once the AggressiveHeap option is
1467 // removed, this can be cleaned up.
1468 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1469 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1470 result = MIN2(result, max_allocatable / fraction);
1471 }
1472 return result;
1473 }
1474
1475 // Use static initialization to get the default before parsing
1476 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1477
1478 void Arguments::set_heap_size() {
1479 julong phys_mem;
1480
1481 // If the user specified one of these options, they
1482 // want specific memory sizing so do not limit memory
1483 // based on compressed oops addressability.
1484 // Also, memory limits will be calculated based on
1485 // available os physical memory, not our MaxRAM limit,
1486 // unless MaxRAM is also specified.
1487 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1488 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1489 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(MaxRAM));
1491 if (override_coop_limit) {
1492 if (FLAG_IS_DEFAULT(MaxRAM)) {
1493 phys_mem = os::physical_memory();
1494 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1495 } else {
1496 phys_mem = (julong)MaxRAM;
1497 }
1498 } else {
1499 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1500 : (julong)MaxRAM;
1501 }
1502
1503 // If the maximum heap size has not been set with -Xmx,
1504 // then set it as fraction of the size of physical memory,
1505 // respecting the maximum and minimum sizes of the heap.
1506 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1507 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1508 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1509 if (reasonable_min < MaxHeapSize) {
1510 // Small physical memory, so use a minimum fraction of it for the heap
1511 reasonable_max = reasonable_min;
1512 } else {
1513 // Not-small physical memory, so require a heap at least
1514 // as large as MaxHeapSize
1515 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1516 }
1517
1518 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1519 // Limit the heap size to ErgoHeapSizeLimit
1520 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1521 }
1522
1523 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1524
1525 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1526 // An initial heap size was specified on the command line,
1527 // so be sure that the maximum size is consistent. Done
1528 // after call to limit_heap_by_allocatable_memory because that
1529 // method might reduce the allocation size.
1530 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1531 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1532 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1533 }
1534
1535 #ifdef _LP64
1536 if (UseCompressedOops || UseCompressedClassPointers) {
1537 // HeapBaseMinAddress can be greater than default but not less than.
1538 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1539 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1540 // matches compressed oops printing flags
1541 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1542 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1543 DefaultHeapBaseMinAddress,
1544 DefaultHeapBaseMinAddress/G,
1545 HeapBaseMinAddress);
1546 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1547 }
1548 }
1549 }
1550 if (UseCompressedOops) {
1551 // Limit the heap size to the maximum possible when using compressed oops
1552 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1553
1554 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1555 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1556 // but it should be not less than default MaxHeapSize.
1557 max_coop_heap -= HeapBaseMinAddress;
1558 }
1559
1560 // If user specified flags prioritizing os physical
1561 // memory limits, then disable compressed oops if
1562 // limits exceed max_coop_heap and UseCompressedOops
1563 // was not specified.
1564 if (reasonable_max > max_coop_heap) {
1565 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1566 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1567 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1568 "Please check the setting of MaxRAMPercentage %5.2f."
1569 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1570 FLAG_SET_ERGO(UseCompressedOops, false);
1571 } else {
1572 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1573 }
1574 }
1575 }
1576 #endif // _LP64
1577
1578 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1579 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1580 }
1581
1582 // If the minimum or initial heap_size have not been set or requested to be set
1583 // ergonomically, set them accordingly.
1584 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1585 julong reasonable_minimum = (julong)(OldSize + NewSize);
1586
1587 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1588
1589 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1590
1591 if (InitialHeapSize == 0) {
1592 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1593 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1594
1595 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1596 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1597
1598 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1599 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1600 }
1601 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1602 // synchronize with InitialHeapSize to avoid errors with the default value.
1603 if (MinHeapSize == 0) {
1604 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1605 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1606 }
1607 }
1608 }
1609
1610 // This option inspects the machine and attempts to set various
1611 // parameters to be optimal for long-running, memory allocation
1612 // intensive jobs. It is intended for machines with large
1613 // amounts of cpu and memory.
1614 jint Arguments::set_aggressive_heap_flags() {
1615 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1616 // VM, but we may not be able to represent the total physical memory
1617 // available (like having 8gb of memory on a box but using a 32bit VM).
1618 // Thus, we need to make sure we're using a julong for intermediate
1619 // calculations.
1620 julong initHeapSize;
1621 julong total_memory = os::physical_memory();
1622
1623 if (total_memory < (julong) 256 * M) {
1624 jio_fprintf(defaultStream::error_stream(),
1625 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1626 vm_exit(1);
1627 }
1628
1629 // The heap size is half of available memory, or (at most)
1630 // all of possible memory less 160mb (leaving room for the OS
1631 // when using ISM). This is the maximum; because adaptive sizing
1632 // is turned on below, the actual space used may be smaller.
1633
1634 initHeapSize = MIN2(total_memory / (julong) 2,
1635 total_memory - (julong) 160 * M);
1636
1637 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1638
1639 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1640 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1641 return JNI_EINVAL;
1642 }
1643 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1644 return JNI_EINVAL;
1645 }
1646 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 }
1650 if (FLAG_IS_DEFAULT(NewSize)) {
1651 // Make the young generation 3/8ths of the total heap.
1652 if (FLAG_SET_CMDLINE(NewSize,
1653 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1654 return JNI_EINVAL;
1655 }
1656 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 }
1660
1661 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1662 FLAG_SET_DEFAULT(UseLargePages, true);
1663 #endif
1664
1665 // Increase some data structure sizes for efficiency
1666 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672
1673 // See the OldPLABSize comment below, but replace 'after promotion'
1674 // with 'after copying'. YoungPLABSize is the size of the survivor
1675 // space per-gc-thread buffers. The default is 4kw.
1676 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1677 return JNI_EINVAL;
1678 }
1679
1680 // OldPLABSize is the size of the buffers in the old gen that
1681 // UseParallelGC uses to promote live data that doesn't fit in the
1682 // survivor spaces. At any given time, there's one for each gc thread.
1683 // The default size is 1kw. These buffers are rarely used, since the
1684 // survivor spaces are usually big enough. For specjbb, however, there
1685 // are occasions when there's lots of live data in the young gen
1686 // and we end up promoting some of it. We don't have a definite
1687 // explanation for why bumping OldPLABSize helps, but the theory
1688 // is that a bigger PLAB results in retaining something like the
1689 // original allocation order after promotion, which improves mutator
1690 // locality. A minor effect may be that larger PLABs reduce the
1691 // number of PLAB allocation events during gc. The value of 8kw
1692 // was arrived at by experimenting with specjbb.
1693 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1694 return JNI_EINVAL;
1695 }
1696
1697 // Enable parallel GC and adaptive generation sizing
1698 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1699 return JNI_EINVAL;
1700 }
1701
1702 // Encourage steady state memory management
1703 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1704 return JNI_EINVAL;
1705 }
1706
1707 return JNI_OK;
1708 }
1709
1710 // This must be called after ergonomics.
1711 void Arguments::set_bytecode_flags() {
1712 if (!RewriteBytecodes) {
1713 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1714 }
1715 }
1716
1717 // Aggressive optimization flags
1718 jint Arguments::set_aggressive_opts_flags() {
1719 #ifdef COMPILER2
1720 if (AggressiveUnboxing) {
1721 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1722 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1723 } else if (!EliminateAutoBox) {
1724 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1725 AggressiveUnboxing = false;
1726 }
1727 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1728 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1729 } else if (!DoEscapeAnalysis) {
1730 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1731 AggressiveUnboxing = false;
1732 }
1733 }
1734 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1735 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1736 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1737 }
1738 // Feed the cache size setting into the JDK
1739 char buffer[1024];
1740 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1741 if (!add_property(buffer)) {
1742 return JNI_ENOMEM;
1743 }
1744 }
1745 #endif
1746
1747 return JNI_OK;
1748 }
1749
1750 //===========================================================================================================
1751
1752 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1753 if (_sun_java_launcher != _default_java_launcher) {
1754 os::free(const_cast<char*>(_sun_java_launcher));
1755 }
1756 _sun_java_launcher = os::strdup_check_oom(launcher);
1757 }
1758
1759 bool Arguments::created_by_java_launcher() {
1760 assert(_sun_java_launcher != nullptr, "property must have value");
1761 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1762 }
1763
1764 bool Arguments::sun_java_launcher_is_altjvm() {
1765 return _sun_java_launcher_is_altjvm;
1766 }
1767
1768 //===========================================================================================================
1769 // Parsing of main arguments
1770
1771 unsigned int addreads_count = 0;
1772 unsigned int addexports_count = 0;
1773 unsigned int addopens_count = 0;
1774 unsigned int patch_mod_count = 0;
1775 unsigned int enable_native_access_count = 0;
1776
1777 // Check the consistency of vm_init_args
1778 bool Arguments::check_vm_args_consistency() {
1779 // Method for adding checks for flag consistency.
1780 // The intent is to warn the user of all possible conflicts,
1781 // before returning an error.
1782 // Note: Needs platform-dependent factoring.
1783 bool status = true;
1784
1785 if (TLABRefillWasteFraction == 0) {
1786 jio_fprintf(defaultStream::error_stream(),
1787 "TLABRefillWasteFraction should be a denominator, "
1788 "not " SIZE_FORMAT "\n",
1789 TLABRefillWasteFraction);
1790 status = false;
1791 }
1792
1793 status = CompilerConfig::check_args_consistency(status);
1794 #if INCLUDE_JVMCI
1795 if (status && EnableJVMCI) {
1796 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1797 AddProperty, UnwriteableProperty, InternalProperty);
1798 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1799 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1800 return false;
1801 }
1802 }
1803 }
1804 #endif
1805
1806 #if INCLUDE_JFR
1807 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1808 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1809 return false;
1810 }
1811 }
1812 #endif
1813
1814 #ifndef SUPPORT_RESERVED_STACK_AREA
1815 if (StackReservedPages != 0) {
1816 FLAG_SET_CMDLINE(StackReservedPages, 0);
1817 warning("Reserved Stack Area not supported on this platform");
1818 }
1819 #endif
1820
1821 #ifndef _LP64
1822 if (LockingMode == LM_LEGACY) {
1823 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1824 // Self-forwarding in bit 3 of the mark-word conflicts
1825 // with 4-byte-aligned stack-locks.
1826 warning("Legacy locking not supported on this platform");
1827 }
1828 #endif
1829
1830 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1831 // ObjectMonitorTable requires lightweight locking.
1832 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1833 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1834 }
1835
1836 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1837 if (LockingMode == LM_MONITOR) {
1838 jio_fprintf(defaultStream::error_stream(),
1839 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1840 return false;
1841 }
1842 #endif
1843 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1844 jio_fprintf(defaultStream::error_stream(),
1845 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1846 return false;
1847 }
1848 return status;
1849 }
1850
1851 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1852 const char* option_type) {
1853 if (ignore) return false;
1854
1855 const char* spacer = " ";
1856 if (option_type == nullptr) {
1857 option_type = ++spacer; // Set both to the empty string.
1858 }
1859
1860 jio_fprintf(defaultStream::error_stream(),
1861 "Unrecognized %s%soption: %s\n", option_type, spacer,
1862 option->optionString);
1863 return true;
1864 }
1865
1866 static const char* user_assertion_options[] = {
1867 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1868 };
1869
1870 static const char* system_assertion_options[] = {
1871 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1872 };
1873
1874 bool Arguments::parse_uint(const char* value,
1875 uint* uint_arg,
1876 uint min_size) {
1877 uint n;
1878 if (!parse_integer(value, &n)) {
1879 return false;
1880 }
1881 if (n >= min_size) {
1882 *uint_arg = n;
1883 return true;
1884 } else {
1885 return false;
1886 }
1887 }
1888
1889 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1890 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1891 CDSConfig::check_internal_module_property(prop_name, prop_value);
1892 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1893 char* property = AllocateHeap(prop_len, mtArguments);
1894 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1895 if (ret < 0 || ret >= (int)prop_len) {
1896 FreeHeap(property);
1897 return false;
1898 }
1899 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1900 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1901 // that multiple occurrences of the associated flag just causes the existing property value to be
1902 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1903 // to a property after we have finished flag processing.
1904 bool added = add_property(property, WriteableProperty, internal);
1905 FreeHeap(property);
1906 return added;
1907 }
1908
1909 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1910 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1911 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1912 const unsigned int props_count_limit = 1000;
1913 const int max_digits = 3;
1914 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1915
1916 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1917 if (count < props_count_limit) {
1918 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1919 char* property = AllocateHeap(prop_len, mtArguments);
1920 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1921 if (ret < 0 || ret >= (int)prop_len) {
1922 FreeHeap(property);
1923 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1924 return false;
1925 }
1926 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1927 FreeHeap(property);
1928 return added;
1929 }
1930
1931 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1932 return false;
1933 }
1934
1935 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1936 julong* long_arg,
1937 julong min_size,
1938 julong max_size) {
1939 if (!parse_integer(s, long_arg)) return arg_unreadable;
1940 return check_memory_size(*long_arg, min_size, max_size);
1941 }
1942
1943 // Parse JavaVMInitArgs structure
1944
1945 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1946 const JavaVMInitArgs *java_tool_options_args,
1947 const JavaVMInitArgs *java_options_args,
1948 const JavaVMInitArgs *cmd_line_args) {
1949 bool patch_mod_javabase = false;
1950
1951 // Save default settings for some mode flags
1952 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1953 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1954 Arguments::_ClipInlining = ClipInlining;
1955 Arguments::_BackgroundCompilation = BackgroundCompilation;
1956
1957 // Remember the default value of SharedBaseAddress.
1958 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1959
1960 // Setup flags for mixed which is the default
1961 set_mode_flags(_mixed);
1962
1963 // Parse args structure generated from java.base vm options resource
1964 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1965 if (result != JNI_OK) {
1966 return result;
1967 }
1968
1969 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1970 // variable (if present).
1971 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1972 if (result != JNI_OK) {
1973 return result;
1974 }
1975
1976 // Parse args structure generated from the command line flags.
1977 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1978 if (result != JNI_OK) {
1979 return result;
1980 }
1981
1982 // Parse args structure generated from the _JAVA_OPTIONS environment
1983 // variable (if present) (mimics classic VM)
1984 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1985 if (result != JNI_OK) {
1986 return result;
1987 }
1988
1989 // Disable CDS for exploded image
1990 if (!has_jimage()) {
1991 no_shared_spaces("CDS disabled on exploded JDK");
1992 }
1993
1994 // We need to ensure processor and memory resources have been properly
1995 // configured - which may rely on arguments we just processed - before
1996 // doing the final argument processing. Any argument processing that
1997 // needs to know about processor and memory resources must occur after
1998 // this point.
1999
2000 os::init_container_support();
2001
2002 SystemMemoryBarrier::initialize();
2003
2004 // Do final processing now that all arguments have been parsed
2005 result = finalize_vm_init_args(patch_mod_javabase);
2006 if (result != JNI_OK) {
2007 return result;
2008 }
2009
2010 return JNI_OK;
2011 }
2012
2013 #if !INCLUDE_JVMTI
2014 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2015 // represents a valid JDWP agent. is_path==true denotes that we
2016 // are dealing with -agentpath (case where name is a path), otherwise with
2017 // -agentlib
2018 static bool valid_jdwp_agent(char *name, bool is_path) {
2019 char *_name;
2020 const char *_jdwp = "jdwp";
2021 size_t _len_jdwp, _len_prefix;
2022
2023 if (is_path) {
2024 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2025 return false;
2026 }
2027
2028 _name++; // skip past last path separator
2029 _len_prefix = strlen(JNI_LIB_PREFIX);
2030
2031 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2032 return false;
2033 }
2034
2035 _name += _len_prefix;
2036 _len_jdwp = strlen(_jdwp);
2037
2038 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2039 _name += _len_jdwp;
2040 }
2041 else {
2042 return false;
2043 }
2044
2045 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2046 return false;
2047 }
2048
2049 return true;
2050 }
2051
2052 if (strcmp(name, _jdwp) == 0) {
2053 return true;
2054 }
2055
2056 return false;
2057 }
2058 #endif
2059
2060 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2061 // --patch-module=<module>=<file>(<pathsep><file>)*
2062 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2063 // Find the equal sign between the module name and the path specification
2064 const char* module_equal = strchr(patch_mod_tail, '=');
2065 if (module_equal == nullptr) {
2066 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2067 return JNI_ERR;
2068 } else {
2069 // Pick out the module name
2070 size_t module_len = module_equal - patch_mod_tail;
2071 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2072 if (module_name != nullptr) {
2073 memcpy(module_name, patch_mod_tail, module_len);
2074 *(module_name + module_len) = '\0';
2075 // The path piece begins one past the module_equal sign
2076 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2077 FREE_C_HEAP_ARRAY(char, module_name);
2078 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2079 return JNI_ENOMEM;
2080 }
2081 } else {
2082 return JNI_ENOMEM;
2083 }
2084 }
2085 return JNI_OK;
2086 }
2087
2088 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2089 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2090 // The min and max sizes match the values in globals.hpp, but scaled
2091 // with K. The values have been chosen so that alignment with page
2092 // size doesn't change the max value, which makes the conversions
2093 // back and forth between Xss value and ThreadStackSize value easier.
2094 // The values have also been chosen to fit inside a 32-bit signed type.
2095 const julong min_ThreadStackSize = 0;
2096 const julong max_ThreadStackSize = 1 * M;
2097
2098 // Make sure the above values match the range set in globals.hpp
2099 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2100 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2101 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2102
2103 const julong min_size = min_ThreadStackSize * K;
2104 const julong max_size = max_ThreadStackSize * K;
2105
2106 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2107
2108 julong size = 0;
2109 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2110 if (errcode != arg_in_range) {
2111 bool silent = (option == nullptr); // Allow testing to silence error messages
2112 if (!silent) {
2113 jio_fprintf(defaultStream::error_stream(),
2114 "Invalid thread stack size: %s\n", option->optionString);
2115 describe_range_error(errcode);
2116 }
2117 return JNI_EINVAL;
2118 }
2119
2120 // Internally track ThreadStackSize in units of 1024 bytes.
2121 const julong size_aligned = align_up(size, K);
2122 assert(size <= size_aligned,
2123 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2124 size, size_aligned);
2125
2126 const julong size_in_K = size_aligned / K;
2127 assert(size_in_K < (julong)max_intx,
2128 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2129 size_in_K);
2130
2131 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2132 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2133 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2134 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2135 max_expanded, size_in_K);
2136
2137 *out_ThreadStackSize = (intx)size_in_K;
2138
2139 return JNI_OK;
2140 }
2141
2142 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2143 // For match_option to return remaining or value part of option string
2144 const char* tail;
2145
2146 // iterate over arguments
2147 for (int index = 0; index < args->nOptions; index++) {
2148 bool is_absolute_path = false; // for -agentpath vs -agentlib
2149
2150 const JavaVMOption* option = args->options + index;
2151
2152 if (!match_option(option, "-Djava.class.path", &tail) &&
2153 !match_option(option, "-Dsun.java.command", &tail) &&
2154 !match_option(option, "-Dsun.java.launcher", &tail)) {
2155
2156 // add all jvm options to the jvm_args string. This string
2157 // is used later to set the java.vm.args PerfData string constant.
2158 // the -Djava.class.path and the -Dsun.java.command options are
2159 // omitted from jvm_args string as each have their own PerfData
2160 // string constant object.
2161 build_jvm_args(option->optionString);
2162 }
2163
2164 // -verbose:[class/module/gc/jni]
2165 if (match_option(option, "-verbose", &tail)) {
2166 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2167 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2168 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2169 } else if (!strcmp(tail, ":module")) {
2170 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2171 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2172 } else if (!strcmp(tail, ":gc")) {
2173 if (_legacyGCLogging.lastFlag == 0) {
2174 _legacyGCLogging.lastFlag = 1;
2175 }
2176 } else if (!strcmp(tail, ":jni")) {
2177 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2178 }
2179 // -da / -ea / -disableassertions / -enableassertions
2180 // These accept an optional class/package name separated by a colon, e.g.,
2181 // -da:java.lang.Thread.
2182 } else if (match_option(option, user_assertion_options, &tail, true)) {
2183 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2184 if (*tail == '\0') {
2185 JavaAssertions::setUserClassDefault(enable);
2186 } else {
2187 assert(*tail == ':', "bogus match by match_option()");
2188 JavaAssertions::addOption(tail + 1, enable);
2189 }
2190 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2191 } else if (match_option(option, system_assertion_options, &tail, false)) {
2192 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2193 JavaAssertions::setSystemClassDefault(enable);
2194 // -bootclasspath:
2195 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2196 jio_fprintf(defaultStream::output_stream(),
2197 "-Xbootclasspath is no longer a supported option.\n");
2198 return JNI_EINVAL;
2199 // -bootclasspath/a:
2200 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2201 Arguments::append_sysclasspath(tail);
2202 // -bootclasspath/p:
2203 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2204 jio_fprintf(defaultStream::output_stream(),
2205 "-Xbootclasspath/p is no longer a supported option.\n");
2206 return JNI_EINVAL;
2207 // -Xrun
2208 } else if (match_option(option, "-Xrun", &tail)) {
2209 if (tail != nullptr) {
2210 const char* pos = strchr(tail, ':');
2211 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2212 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2213 jio_snprintf(name, len + 1, "%s", tail);
2214
2215 char *options = nullptr;
2216 if(pos != nullptr) {
2217 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2218 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2219 }
2220 #if !INCLUDE_JVMTI
2221 if (strcmp(name, "jdwp") == 0) {
2222 jio_fprintf(defaultStream::error_stream(),
2223 "Debugging agents are not supported in this VM\n");
2224 return JNI_ERR;
2225 }
2226 #endif // !INCLUDE_JVMTI
2227 JvmtiAgentList::add_xrun(name, options, false);
2228 FREE_C_HEAP_ARRAY(char, name);
2229 FREE_C_HEAP_ARRAY(char, options);
2230 }
2231 } else if (match_option(option, "--add-reads=", &tail)) {
2232 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2233 return JNI_ENOMEM;
2234 }
2235 } else if (match_option(option, "--add-exports=", &tail)) {
2236 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2237 return JNI_ENOMEM;
2238 }
2239 } else if (match_option(option, "--add-opens=", &tail)) {
2240 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2241 return JNI_ENOMEM;
2242 }
2243 } else if (match_option(option, "--add-modules=", &tail)) {
2244 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2245 return JNI_ENOMEM;
2246 }
2247 } else if (match_option(option, "--enable-native-access=", &tail)) {
2248 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2249 return JNI_ENOMEM;
2250 }
2251 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2252 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2253 return JNI_ENOMEM;
2254 }
2255 } else if (match_option(option, "--limit-modules=", &tail)) {
2256 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2257 return JNI_ENOMEM;
2258 }
2259 } else if (match_option(option, "--module-path=", &tail)) {
2260 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2261 return JNI_ENOMEM;
2262 }
2263 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2264 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2265 return JNI_ENOMEM;
2266 }
2267 } else if (match_option(option, "--patch-module=", &tail)) {
2268 // --patch-module=<module>=<file>(<pathsep><file>)*
2269 int res = process_patch_mod_option(tail, patch_mod_javabase);
2270 if (res != JNI_OK) {
2271 return res;
2272 }
2273 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2274 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2275 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2276 AddProperty, WriteableProperty, InternalProperty);
2277 } else {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2280 return JNI_ERR;
2281 }
2282 } else if (match_option(option, "--illegal-access=", &tail)) {
2283 char version[256];
2284 JDK_Version::jdk(17).to_string(version, sizeof(version));
2285 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2286 // -agentlib and -agentpath
2287 } else if (match_option(option, "-agentlib:", &tail) ||
2288 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2289 if(tail != nullptr) {
2290 const char* pos = strchr(tail, '=');
2291 char* name;
2292 if (pos == nullptr) {
2293 name = os::strdup_check_oom(tail, mtArguments);
2294 } else {
2295 size_t len = pos - tail;
2296 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2297 memcpy(name, tail, len);
2298 name[len] = '\0';
2299 }
2300
2301 char *options = nullptr;
2302 if(pos != nullptr) {
2303 options = os::strdup_check_oom(pos + 1, mtArguments);
2304 }
2305 #if !INCLUDE_JVMTI
2306 if (valid_jdwp_agent(name, is_absolute_path)) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "Debugging agents are not supported in this VM\n");
2309 return JNI_ERR;
2310 }
2311 #endif // !INCLUDE_JVMTI
2312 JvmtiAgentList::add(name, options, is_absolute_path);
2313 os::free(name);
2314 os::free(options);
2315 }
2316 // -javaagent
2317 } else if (match_option(option, "-javaagent:", &tail)) {
2318 #if !INCLUDE_JVMTI
2319 jio_fprintf(defaultStream::error_stream(),
2320 "Instrumentation agents are not supported in this VM\n");
2321 return JNI_ERR;
2322 #else
2323 if (tail != nullptr) {
2324 size_t length = strlen(tail) + 1;
2325 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2326 jio_snprintf(options, length, "%s", tail);
2327 JvmtiAgentList::add("instrument", options, false);
2328 FREE_C_HEAP_ARRAY(char, options);
2329
2330 // java agents need module java.instrument
2331 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2332 return JNI_ENOMEM;
2333 }
2334 }
2335 #endif // !INCLUDE_JVMTI
2336 // --enable_preview
2337 } else if (match_option(option, "--enable-preview")) {
2338 set_enable_preview();
2339 // -Xnoclassgc
2340 } else if (match_option(option, "-Xnoclassgc")) {
2341 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2342 return JNI_EINVAL;
2343 }
2344 // -Xbatch
2345 } else if (match_option(option, "-Xbatch")) {
2346 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2347 return JNI_EINVAL;
2348 }
2349 // -Xmn for compatibility with other JVM vendors
2350 } else if (match_option(option, "-Xmn", &tail)) {
2351 julong long_initial_young_size = 0;
2352 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2353 if (errcode != arg_in_range) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "Invalid initial young generation size: %s\n", option->optionString);
2356 describe_range_error(errcode);
2357 return JNI_EINVAL;
2358 }
2359 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2360 return JNI_EINVAL;
2361 }
2362 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2363 return JNI_EINVAL;
2364 }
2365 // -Xms
2366 } else if (match_option(option, "-Xms", &tail)) {
2367 julong size = 0;
2368 // an initial heap size of 0 means automatically determine
2369 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2370 if (errcode != arg_in_range) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "Invalid initial heap size: %s\n", option->optionString);
2373 describe_range_error(errcode);
2374 return JNI_EINVAL;
2375 }
2376 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2377 return JNI_EINVAL;
2378 }
2379 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2380 return JNI_EINVAL;
2381 }
2382 // -Xmx
2383 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2384 julong long_max_heap_size = 0;
2385 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2386 if (errcode != arg_in_range) {
2387 jio_fprintf(defaultStream::error_stream(),
2388 "Invalid maximum heap size: %s\n", option->optionString);
2389 describe_range_error(errcode);
2390 return JNI_EINVAL;
2391 }
2392 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2393 return JNI_EINVAL;
2394 }
2395 // Xmaxf
2396 } else if (match_option(option, "-Xmaxf", &tail)) {
2397 char* err;
2398 int maxf = (int)(strtod(tail, &err) * 100);
2399 if (*err != '\0' || *tail == '\0') {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Bad max heap free percentage size: %s\n",
2402 option->optionString);
2403 return JNI_EINVAL;
2404 } else {
2405 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 }
2409 // Xminf
2410 } else if (match_option(option, "-Xminf", &tail)) {
2411 char* err;
2412 int minf = (int)(strtod(tail, &err) * 100);
2413 if (*err != '\0' || *tail == '\0') {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Bad min heap free percentage size: %s\n",
2416 option->optionString);
2417 return JNI_EINVAL;
2418 } else {
2419 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2420 return JNI_EINVAL;
2421 }
2422 }
2423 // -Xss
2424 } else if (match_option(option, "-Xss", &tail)) {
2425 intx value = 0;
2426 jint err = parse_xss(option, tail, &value);
2427 if (err != JNI_OK) {
2428 return err;
2429 }
2430 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2431 return JNI_EINVAL;
2432 }
2433 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2434 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2435 julong long_ReservedCodeCacheSize = 0;
2436
2437 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2438 if (errcode != arg_in_range) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Invalid maximum code cache size: %s.\n", option->optionString);
2441 return JNI_EINVAL;
2442 }
2443 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2444 return JNI_EINVAL;
2445 }
2446 // -green
2447 } else if (match_option(option, "-green")) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Green threads support not available\n");
2450 return JNI_EINVAL;
2451 // -native
2452 } else if (match_option(option, "-native")) {
2453 // HotSpot always uses native threads, ignore silently for compatibility
2454 // -Xrs
2455 } else if (match_option(option, "-Xrs")) {
2456 // Classic/EVM option, new functionality
2457 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2458 return JNI_EINVAL;
2459 }
2460 // -Xprof
2461 } else if (match_option(option, "-Xprof")) {
2462 char version[256];
2463 // Obsolete in JDK 10
2464 JDK_Version::jdk(10).to_string(version, sizeof(version));
2465 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2466 // -Xinternalversion
2467 } else if (match_option(option, "-Xinternalversion")) {
2468 jio_fprintf(defaultStream::output_stream(), "%s\n",
2469 VM_Version::internal_vm_info_string());
2470 vm_exit(0);
2471 #ifndef PRODUCT
2472 // -Xprintflags
2473 } else if (match_option(option, "-Xprintflags")) {
2474 JVMFlag::printFlags(tty, false);
2475 vm_exit(0);
2476 #endif
2477 // -D
2478 } else if (match_option(option, "-D", &tail)) {
2479 const char* value;
2480 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2481 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2482 // abort if -Djava.endorsed.dirs is set
2483 jio_fprintf(defaultStream::output_stream(),
2484 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2485 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2486 return JNI_EINVAL;
2487 }
2488 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2489 *value != '\0' && strcmp(value, "\"\"") != 0) {
2490 // abort if -Djava.ext.dirs is set
2491 jio_fprintf(defaultStream::output_stream(),
2492 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2493 return JNI_EINVAL;
2494 }
2495 // Check for module related properties. They must be set using the modules
2496 // options. For example: use "--add-modules=java.sql", not
2497 // "-Djdk.module.addmods=java.sql"
2498 if (is_internal_module_property(option->optionString + 2)) {
2499 needs_module_property_warning = true;
2500 continue;
2501 }
2502 if (!add_property(tail)) {
2503 return JNI_ENOMEM;
2504 }
2505 // Out of the box management support
2506 if (match_option(option, "-Dcom.sun.management", &tail)) {
2507 #if INCLUDE_MANAGEMENT
2508 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2509 return JNI_EINVAL;
2510 }
2511 // management agent in module jdk.management.agent
2512 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2513 return JNI_ENOMEM;
2514 }
2515 #else
2516 jio_fprintf(defaultStream::output_stream(),
2517 "-Dcom.sun.management is not supported in this VM.\n");
2518 return JNI_ERR;
2519 #endif
2520 }
2521 // -Xint
2522 } else if (match_option(option, "-Xint")) {
2523 set_mode_flags(_int);
2524 mode_flag_cmd_line = true;
2525 // -Xmixed
2526 } else if (match_option(option, "-Xmixed")) {
2527 set_mode_flags(_mixed);
2528 mode_flag_cmd_line = true;
2529 // -Xcomp
2530 } else if (match_option(option, "-Xcomp")) {
2531 // for testing the compiler; turn off all flags that inhibit compilation
2532 set_mode_flags(_comp);
2533 mode_flag_cmd_line = true;
2534 // -Xshare:dump
2535 } else if (match_option(option, "-Xshare:dump")) {
2536 CDSConfig::enable_dumping_static_archive();
2537 CDSConfig::set_old_cds_flags_used();
2538 // -Xshare:on
2539 } else if (match_option(option, "-Xshare:on")) {
2540 UseSharedSpaces = true;
2541 RequireSharedSpaces = true;
2542 CDSConfig::set_old_cds_flags_used();
2543 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2544 } else if (match_option(option, "-Xshare:auto")) {
2545 UseSharedSpaces = true;
2546 RequireSharedSpaces = false;
2547 xshare_auto_cmd_line = true;
2548 CDSConfig::set_old_cds_flags_used();
2549 // -Xshare:off
2550 } else if (match_option(option, "-Xshare:off")) {
2551 UseSharedSpaces = false;
2552 RequireSharedSpaces = false;
2553 CDSConfig::set_old_cds_flags_used();
2554 // -Xverify
2555 } else if (match_option(option, "-Xverify", &tail)) {
2556 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2557 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2558 return JNI_EINVAL;
2559 }
2560 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2561 return JNI_EINVAL;
2562 }
2563 } else if (strcmp(tail, ":remote") == 0) {
2564 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != 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, ":none") == 0) {
2571 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2572 return JNI_EINVAL;
2573 }
2574 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2578 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2579 return JNI_EINVAL;
2580 }
2581 // -Xdebug
2582 } else if (match_option(option, "-Xdebug")) {
2583 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2584 } else if (match_option(option, "-Xloggc:", &tail)) {
2585 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2586 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2587 _legacyGCLogging.lastFlag = 2;
2588 _legacyGCLogging.file = os::strdup_check_oom(tail);
2589 } else if (match_option(option, "-Xlog", &tail)) {
2590 bool ret = false;
2591 if (strcmp(tail, ":help") == 0) {
2592 fileStream stream(defaultStream::output_stream());
2593 LogConfiguration::print_command_line_help(&stream);
2594 vm_exit(0);
2595 } else if (strcmp(tail, ":disable") == 0) {
2596 LogConfiguration::disable_logging();
2597 ret = true;
2598 } else if (strcmp(tail, ":async") == 0) {
2599 LogConfiguration::set_async_mode(true);
2600 ret = true;
2601 } else if (*tail == '\0') {
2602 ret = LogConfiguration::parse_command_line_arguments();
2603 assert(ret, "-Xlog without arguments should never fail to parse");
2604 } else if (*tail == ':') {
2605 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2606 }
2607 if (ret == false) {
2608 jio_fprintf(defaultStream::error_stream(),
2609 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2610 tail);
2611 return JNI_EINVAL;
2612 }
2613 // JNI hooks
2614 } else if (match_option(option, "-Xcheck", &tail)) {
2615 if (!strcmp(tail, ":jni")) {
2616 #if !INCLUDE_JNI_CHECK
2617 warning("JNI CHECKING is not supported in this VM");
2618 #else
2619 CheckJNICalls = true;
2620 #endif // INCLUDE_JNI_CHECK
2621 } else if (is_bad_option(option, args->ignoreUnrecognized,
2622 "check")) {
2623 return JNI_EINVAL;
2624 }
2625 } else if (match_option(option, "vfprintf")) {
2626 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2627 } else if (match_option(option, "exit")) {
2628 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2629 } else if (match_option(option, "abort")) {
2630 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2631 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2632 // and the last option wins.
2633 } else if (match_option(option, "-XX:+NeverTenure")) {
2634 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2635 return JNI_EINVAL;
2636 }
2637 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2641 return JNI_EINVAL;
2642 }
2643 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2644 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2654 uint max_tenuring_thresh = 0;
2655 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2658 return JNI_EINVAL;
2659 }
2660
2661 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2662 return JNI_EINVAL;
2663 }
2664
2665 if (MaxTenuringThreshold == 0) {
2666 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 } else {
2673 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 }
2680 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2681 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2685 return JNI_EINVAL;
2686 }
2687 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2688 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2692 return JNI_EINVAL;
2693 }
2694 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2695 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2702 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 } else if (match_option(option, "--finalization=", &tail)) {
2709 if (strcmp(tail, "enabled") == 0) {
2710 InstanceKlass::set_finalization_enabled(true);
2711 } else if (strcmp(tail, "disabled") == 0) {
2712 InstanceKlass::set_finalization_enabled(false);
2713 } else {
2714 jio_fprintf(defaultStream::error_stream(),
2715 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2716 tail);
2717 return JNI_EINVAL;
2718 }
2719 #if !defined(DTRACE_ENABLED)
2720 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2721 jio_fprintf(defaultStream::error_stream(),
2722 "DTraceMethodProbes flag is not applicable for this configuration\n");
2723 return JNI_EINVAL;
2724 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2725 jio_fprintf(defaultStream::error_stream(),
2726 "DTraceAllocProbes flag is not applicable for this configuration\n");
2727 return JNI_EINVAL;
2728 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2729 jio_fprintf(defaultStream::error_stream(),
2730 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2731 return JNI_EINVAL;
2732 #endif // !defined(DTRACE_ENABLED)
2733 #ifdef ASSERT
2734 } else if (match_option(option, "-XX:+FullGCALot")) {
2735 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 #endif
2739 #if !INCLUDE_MANAGEMENT
2740 } else if (match_option(option, "-XX:+ManagementServer")) {
2741 jio_fprintf(defaultStream::error_stream(),
2742 "ManagementServer is not supported in this VM.\n");
2743 return JNI_ERR;
2744 #endif // INCLUDE_MANAGEMENT
2745 #if INCLUDE_JVMCI
2746 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2747 if (EnableJVMCIProduct) {
2748 jio_fprintf(defaultStream::error_stream(),
2749 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2750 return JNI_EINVAL;
2751 }
2752 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2753 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2754 if (use_graal_jit) {
2755 const char* jvmci_compiler = get_property("jvmci.Compiler");
2756 if (jvmci_compiler != nullptr) {
2757 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2760 return JNI_ERR;
2761 }
2762 } else if (!add_property("jvmci.Compiler=graal")) {
2763 return JNI_ENOMEM;
2764 }
2765 }
2766
2767 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2768 if (EnableJVMCIProduct) {
2769 continue;
2770 }
2771 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2772 // Allow this flag if it has been unlocked.
2773 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2774 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Unable to enable JVMCI in product mode\n");
2777 return JNI_ERR;
2778 }
2779 }
2780 // The flag was locked so process normally to report that error
2781 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2782 return JNI_EINVAL;
2783 }
2784 #endif // INCLUDE_JVMCI
2785 #if INCLUDE_JFR
2786 } else if (match_jfr_option(&option)) {
2787 return JNI_EINVAL;
2788 #endif
2789 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2790 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2791 // already been handled
2792 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2793 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2794 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2795 return JNI_EINVAL;
2796 }
2797 }
2798 // Unknown option
2799 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2800 return JNI_ERR;
2801 }
2802 }
2803
2804 // PrintSharedArchiveAndExit will turn on
2805 // -Xshare:on
2806 // -Xlog:class+path=info
2807 if (PrintSharedArchiveAndExit) {
2808 UseSharedSpaces = true;
2809 RequireSharedSpaces = true;
2810 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2811 }
2812
2813 fix_appclasspath();
2814
2815 return JNI_OK;
2816 }
2817
2818 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2819 // For java.base check for duplicate --patch-module options being specified on the command line.
2820 // This check is only required for java.base, all other duplicate module specifications
2821 // will be checked during module system initialization. The module system initialization
2822 // will throw an ExceptionInInitializerError if this situation occurs.
2823 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2824 if (*patch_mod_javabase) {
2825 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2826 } else {
2827 *patch_mod_javabase = true;
2828 }
2829 }
2830
2831 // Create GrowableArray lazily, only if --patch-module has been specified
2832 if (_patch_mod_prefix == nullptr) {
2833 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2834 }
2835
2836 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2837 }
2838
2839 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2840 //
2841 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2842 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2843 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2844 // path is treated as the current directory.
2845 //
2846 // This causes problems with CDS, which requires that all directories specified in the classpath
2847 // must be empty. In most cases, applications do NOT want to load classes from the current
2848 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2849 // scripts compatible with CDS.
2850 void Arguments::fix_appclasspath() {
2851 if (IgnoreEmptyClassPaths) {
2852 const char separator = *os::path_separator();
2853 const char* src = _java_class_path->value();
2854
2855 // skip over all the leading empty paths
2856 while (*src == separator) {
2857 src ++;
2858 }
2859
2860 char* copy = os::strdup_check_oom(src, mtArguments);
2861
2862 // trim all trailing empty paths
2863 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2864 *tail = '\0';
2865 }
2866
2867 char from[3] = {separator, separator, '\0'};
2868 char to [2] = {separator, '\0'};
2869 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2870 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2871 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2872 }
2873
2874 _java_class_path->set_writeable_value(copy);
2875 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2876 }
2877 }
2878
2879 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2880 // check if the default lib/endorsed directory exists; if so, error
2881 char path[JVM_MAXPATHLEN];
2882 const char* fileSep = os::file_separator();
2883 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2884
2885 DIR* dir = os::opendir(path);
2886 if (dir != nullptr) {
2887 jio_fprintf(defaultStream::output_stream(),
2888 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2889 "in modular form will be supported via the concept of upgradeable modules.\n");
2890 os::closedir(dir);
2891 return JNI_ERR;
2892 }
2893
2894 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2895 dir = os::opendir(path);
2896 if (dir != nullptr) {
2897 jio_fprintf(defaultStream::output_stream(),
2898 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2899 "Use -classpath instead.\n.");
2900 os::closedir(dir);
2901 return JNI_ERR;
2902 }
2903
2904 // This must be done after all arguments have been processed
2905 // and the container support has been initialized since AggressiveHeap
2906 // relies on the amount of total memory available.
2907 if (AggressiveHeap) {
2908 jint result = set_aggressive_heap_flags();
2909 if (result != JNI_OK) {
2910 return result;
2911 }
2912 }
2913
2914 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2915 // but like -Xint, leave compilation thresholds unaffected.
2916 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2917 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2918 set_mode_flags(_int);
2919 }
2920
2921 #ifdef ZERO
2922 // Zero always runs in interpreted mode
2923 set_mode_flags(_int);
2924 #endif
2925
2926 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2927 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2928 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2929 }
2930
2931 #if !COMPILER2_OR_JVMCI
2932 // Don't degrade server performance for footprint
2933 if (FLAG_IS_DEFAULT(UseLargePages) &&
2934 MaxHeapSize < LargePageHeapSizeThreshold) {
2935 // No need for large granularity pages w/small heaps.
2936 // Note that large pages are enabled/disabled for both the
2937 // Java heap and the code cache.
2938 FLAG_SET_DEFAULT(UseLargePages, false);
2939 }
2940
2941 UNSUPPORTED_OPTION(ProfileInterpreter);
2942 #endif
2943
2944 // Parse the CompilationMode flag
2945 if (!CompilationModeFlag::initialize()) {
2946 return JNI_ERR;
2947 }
2948
2949 if (!check_vm_args_consistency()) {
2950 return JNI_ERR;
2951 }
2952
2953 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2954 return JNI_ERR;
2955 }
2956
2957 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2958 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2959 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2960
2961 return JNI_OK;
2962 }
2963
2964 // Helper class for controlling the lifetime of JavaVMInitArgs
2965 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2966 // deleted on the destruction of the ScopedVMInitArgs object.
2967 class ScopedVMInitArgs : public StackObj {
2968 private:
2969 JavaVMInitArgs _args;
2970 char* _container_name;
2971 bool _is_set;
2972 char* _vm_options_file_arg;
2973
2974 public:
2975 ScopedVMInitArgs(const char *container_name) {
2976 _args.version = JNI_VERSION_1_2;
2977 _args.nOptions = 0;
2978 _args.options = nullptr;
2979 _args.ignoreUnrecognized = false;
2980 _container_name = (char *)container_name;
2981 _is_set = false;
2982 _vm_options_file_arg = nullptr;
2983 }
2984
2985 // Populates the JavaVMInitArgs object represented by this
2986 // ScopedVMInitArgs object with the arguments in options. The
2987 // allocated memory is deleted by the destructor. If this method
2988 // returns anything other than JNI_OK, then this object is in a
2989 // partially constructed state, and should be abandoned.
2990 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2991 _is_set = true;
2992 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2993 JavaVMOption, options->length(), mtArguments);
2994 if (options_arr == nullptr) {
2995 return JNI_ENOMEM;
2996 }
2997 _args.options = options_arr;
2998
2999 for (int i = 0; i < options->length(); i++) {
3000 options_arr[i] = options->at(i);
3001 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3002 if (options_arr[i].optionString == nullptr) {
3003 // Rely on the destructor to do cleanup.
3004 _args.nOptions = i;
3005 return JNI_ENOMEM;
3006 }
3007 }
3008
3009 _args.nOptions = options->length();
3010 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3011 return JNI_OK;
3012 }
3013
3014 JavaVMInitArgs* get() { return &_args; }
3015 char* container_name() { return _container_name; }
3016 bool is_set() { return _is_set; }
3017 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3018 char* vm_options_file_arg() { return _vm_options_file_arg; }
3019
3020 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3021 if (_vm_options_file_arg != nullptr) {
3022 os::free(_vm_options_file_arg);
3023 }
3024 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3025 }
3026
3027 ~ScopedVMInitArgs() {
3028 if (_vm_options_file_arg != nullptr) {
3029 os::free(_vm_options_file_arg);
3030 }
3031 if (_args.options == nullptr) return;
3032 for (int i = 0; i < _args.nOptions; i++) {
3033 os::free(_args.options[i].optionString);
3034 }
3035 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3036 }
3037
3038 // Insert options into this option list, to replace option at
3039 // vm_options_file_pos (-XX:VMOptionsFile)
3040 jint insert(const JavaVMInitArgs* args,
3041 const JavaVMInitArgs* args_to_insert,
3042 const int vm_options_file_pos) {
3043 assert(_args.options == nullptr, "shouldn't be set yet");
3044 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3045 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3046
3047 int length = args->nOptions + args_to_insert->nOptions - 1;
3048 // Construct new option array
3049 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3050 for (int i = 0; i < args->nOptions; i++) {
3051 if (i == vm_options_file_pos) {
3052 // insert the new options starting at the same place as the
3053 // -XX:VMOptionsFile option
3054 for (int j = 0; j < args_to_insert->nOptions; j++) {
3055 options.push(args_to_insert->options[j]);
3056 }
3057 } else {
3058 options.push(args->options[i]);
3059 }
3060 }
3061 // make into options array
3062 return set_args(&options);
3063 }
3064 };
3065
3066 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3067 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3068 }
3069
3070 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3071 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3072 }
3073
3074 jint Arguments::parse_options_environment_variable(const char* name,
3075 ScopedVMInitArgs* vm_args) {
3076 char *buffer = ::getenv(name);
3077
3078 // Don't check this environment variable if user has special privileges
3079 // (e.g. unix su command).
3080 if (buffer == nullptr || os::have_special_privileges()) {
3081 return JNI_OK;
3082 }
3083
3084 if ((buffer = os::strdup(buffer)) == nullptr) {
3085 return JNI_ENOMEM;
3086 }
3087
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Picked up %s: %s\n", name, buffer);
3090
3091 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3092
3093 os::free(buffer);
3094 return retcode;
3095 }
3096
3097 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3098 // read file into buffer
3099 int fd = ::open(file_name, O_RDONLY);
3100 if (fd < 0) {
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Could not open options file '%s'\n",
3103 file_name);
3104 return JNI_ERR;
3105 }
3106
3107 struct stat stbuf;
3108 int retcode = os::stat(file_name, &stbuf);
3109 if (retcode != 0) {
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Could not stat options file '%s'\n",
3112 file_name);
3113 ::close(fd);
3114 return JNI_ERR;
3115 }
3116
3117 if (stbuf.st_size == 0) {
3118 // tell caller there is no option data and that is ok
3119 ::close(fd);
3120 return JNI_OK;
3121 }
3122
3123 // '+ 1' for null termination even with max bytes
3124 size_t bytes_alloc = stbuf.st_size + 1;
3125
3126 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3127 if (nullptr == buf) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Could not allocate read buffer for options file parse\n");
3130 ::close(fd);
3131 return JNI_ENOMEM;
3132 }
3133
3134 memset(buf, 0, bytes_alloc);
3135
3136 // Fill buffer
3137 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3138 ::close(fd);
3139 if (bytes_read < 0) {
3140 FREE_C_HEAP_ARRAY(char, buf);
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Could not read options file '%s'\n", file_name);
3143 return JNI_ERR;
3144 }
3145
3146 if (bytes_read == 0) {
3147 // tell caller there is no option data and that is ok
3148 FREE_C_HEAP_ARRAY(char, buf);
3149 return JNI_OK;
3150 }
3151
3152 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3153
3154 FREE_C_HEAP_ARRAY(char, buf);
3155 return retcode;
3156 }
3157
3158 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3159 // Construct option array
3160 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3161
3162 // some pointers to help with parsing
3163 char *buffer_end = buffer + buf_len;
3164 char *opt_hd = buffer;
3165 char *wrt = buffer;
3166 char *rd = buffer;
3167
3168 // parse all options
3169 while (rd < buffer_end) {
3170 // skip leading white space from the input string
3171 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3172 rd++;
3173 }
3174
3175 if (rd >= buffer_end) {
3176 break;
3177 }
3178
3179 // Remember this is where we found the head of the token.
3180 opt_hd = wrt;
3181
3182 // Tokens are strings of non white space characters separated
3183 // by one or more white spaces.
3184 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3185 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3186 int quote = *rd; // matching quote to look for
3187 rd++; // don't copy open quote
3188 while (rd < buffer_end && *rd != quote) {
3189 // include everything (even spaces)
3190 // up until the close quote
3191 *wrt++ = *rd++; // copy to option string
3192 }
3193
3194 if (rd < buffer_end) {
3195 rd++; // don't copy close quote
3196 } else {
3197 // did not see closing quote
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Unmatched quote in %s\n", name);
3200 return JNI_ERR;
3201 }
3202 } else {
3203 *wrt++ = *rd++; // copy to option string
3204 }
3205 }
3206
3207 // steal a white space character and set it to null
3208 *wrt++ = '\0';
3209 // We now have a complete token
3210
3211 JavaVMOption option;
3212 option.optionString = opt_hd;
3213 option.extraInfo = nullptr;
3214
3215 options.append(option); // Fill in option
3216
3217 rd++; // Advance to next character
3218 }
3219
3220 // Fill out JavaVMInitArgs structure.
3221 return vm_args->set_args(&options);
3222 }
3223
3224 #ifndef PRODUCT
3225 // Determine whether LogVMOutput should be implicitly turned on.
3226 static bool use_vm_log() {
3227 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3228 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3229 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3230 PrintAssembly || TraceDeoptimization ||
3231 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3232 return true;
3233 }
3234
3235 #ifdef COMPILER1
3236 if (PrintC1Statistics) {
3237 return true;
3238 }
3239 #endif // COMPILER1
3240
3241 #ifdef COMPILER2
3242 if (PrintOptoAssembly || PrintOptoStatistics) {
3243 return true;
3244 }
3245 #endif // COMPILER2
3246
3247 return false;
3248 }
3249
3250 #endif // PRODUCT
3251
3252 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3253 for (int index = 0; index < args->nOptions; index++) {
3254 const JavaVMOption* option = args->options + index;
3255 const char* tail;
3256 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3257 return true;
3258 }
3259 }
3260 return false;
3261 }
3262
3263 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3264 const char* vm_options_file,
3265 const int vm_options_file_pos,
3266 ScopedVMInitArgs* vm_options_file_args,
3267 ScopedVMInitArgs* args_out) {
3268 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3269 if (code != JNI_OK) {
3270 return code;
3271 }
3272
3273 if (vm_options_file_args->get()->nOptions < 1) {
3274 return JNI_OK;
3275 }
3276
3277 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3278 jio_fprintf(defaultStream::error_stream(),
3279 "A VM options file may not refer to a VM options file. "
3280 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3281 "options file '%s' in options container '%s' is an error.\n",
3282 vm_options_file_args->vm_options_file_arg(),
3283 vm_options_file_args->container_name());
3284 return JNI_EINVAL;
3285 }
3286
3287 return args_out->insert(args, vm_options_file_args->get(),
3288 vm_options_file_pos);
3289 }
3290
3291 // Expand -XX:VMOptionsFile found in args_in as needed.
3292 // mod_args and args_out parameters may return values as needed.
3293 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3294 ScopedVMInitArgs* mod_args,
3295 JavaVMInitArgs** args_out) {
3296 jint code = match_special_option_and_act(args_in, mod_args);
3297 if (code != JNI_OK) {
3298 return code;
3299 }
3300
3301 if (mod_args->is_set()) {
3302 // args_in contains -XX:VMOptionsFile and mod_args contains the
3303 // original options from args_in along with the options expanded
3304 // from the VMOptionsFile. Return a short-hand to the caller.
3305 *args_out = mod_args->get();
3306 } else {
3307 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3308 }
3309 return JNI_OK;
3310 }
3311
3312 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3313 ScopedVMInitArgs* args_out) {
3314 // Remaining part of option string
3315 const char* tail;
3316 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3317
3318 for (int index = 0; index < args->nOptions; index++) {
3319 const JavaVMOption* option = args->options + index;
3320 if (match_option(option, "-XX:Flags=", &tail)) {
3321 Arguments::set_jvm_flags_file(tail);
3322 continue;
3323 }
3324 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3325 if (vm_options_file_args.found_vm_options_file_arg()) {
3326 jio_fprintf(defaultStream::error_stream(),
3327 "The option '%s' is already specified in the options "
3328 "container '%s' so the specification of '%s' in the "
3329 "same options container is an error.\n",
3330 vm_options_file_args.vm_options_file_arg(),
3331 vm_options_file_args.container_name(),
3332 option->optionString);
3333 return JNI_EINVAL;
3334 }
3335 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3336 // If there's a VMOptionsFile, parse that
3337 jint code = insert_vm_options_file(args, tail, index,
3338 &vm_options_file_args, args_out);
3339 if (code != JNI_OK) {
3340 return code;
3341 }
3342 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3343 if (args_out->is_set()) {
3344 // The VMOptions file inserted some options so switch 'args'
3345 // to the new set of options, and continue processing which
3346 // preserves "last option wins" semantics.
3347 args = args_out->get();
3348 // The first option from the VMOptionsFile replaces the
3349 // current option. So we back track to process the
3350 // replacement option.
3351 index--;
3352 }
3353 continue;
3354 }
3355 if (match_option(option, "-XX:+PrintVMOptions")) {
3356 PrintVMOptions = true;
3357 continue;
3358 }
3359 if (match_option(option, "-XX:-PrintVMOptions")) {
3360 PrintVMOptions = false;
3361 continue;
3362 }
3363 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3364 IgnoreUnrecognizedVMOptions = true;
3365 continue;
3366 }
3367 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3368 IgnoreUnrecognizedVMOptions = false;
3369 continue;
3370 }
3371 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3372 JVMFlag::printFlags(tty, false);
3373 vm_exit(0);
3374 }
3375
3376 #ifndef PRODUCT
3377 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3378 JVMFlag::printFlags(tty, true);
3379 vm_exit(0);
3380 }
3381 #endif
3382 }
3383 return JNI_OK;
3384 }
3385
3386 static void print_options(const JavaVMInitArgs *args) {
3387 const char* tail;
3388 for (int index = 0; index < args->nOptions; index++) {
3389 const JavaVMOption *option = args->options + index;
3390 if (match_option(option, "-XX:", &tail)) {
3391 logOption(tail);
3392 }
3393 }
3394 }
3395
3396 bool Arguments::handle_deprecated_print_gc_flags() {
3397 if (PrintGC) {
3398 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3399 }
3400 if (PrintGCDetails) {
3401 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3402 }
3403
3404 if (_legacyGCLogging.lastFlag == 2) {
3405 // -Xloggc was used to specify a filename
3406 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3407
3408 LogTarget(Error, logging) target;
3409 LogStream errstream(target);
3410 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3411 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3412 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3413 }
3414 return true;
3415 }
3416
3417 static void apply_debugger_ergo() {
3418 #ifdef ASSERT
3419 if (ReplayCompiles) {
3420 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3421 }
3422
3423 if (UseDebuggerErgo) {
3424 // Turn on sub-flags
3425 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3426 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3427 }
3428
3429 if (UseDebuggerErgo2) {
3430 // Debugging with limited number of CPUs
3431 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3432 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3433 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3434 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3435 }
3436 #endif // ASSERT
3437 }
3438
3439 // Parse entry point called from JNI_CreateJavaVM
3440
3441 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3442 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3443 JVMFlag::check_all_flag_declarations();
3444
3445 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3446 const char* hotspotrc = ".hotspotrc";
3447 bool settings_file_specified = false;
3448 bool needs_hotspotrc_warning = false;
3449 ScopedVMInitArgs initial_vm_options_args("");
3450 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3451 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3452
3453 // Pointers to current working set of containers
3454 JavaVMInitArgs* cur_cmd_args;
3455 JavaVMInitArgs* cur_vm_options_args;
3456 JavaVMInitArgs* cur_java_options_args;
3457 JavaVMInitArgs* cur_java_tool_options_args;
3458
3459 // Containers for modified/expanded options
3460 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3461 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3462 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3463 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3464
3465
3466 jint code =
3467 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3468 if (code != JNI_OK) {
3469 return code;
3470 }
3471
3472 code = parse_java_options_environment_variable(&initial_java_options_args);
3473 if (code != JNI_OK) {
3474 return code;
3475 }
3476
3477 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3478 char *vmoptions = ClassLoader::lookup_vm_options();
3479 if (vmoptions != nullptr) {
3480 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3481 FREE_C_HEAP_ARRAY(char, vmoptions);
3482 if (code != JNI_OK) {
3483 return code;
3484 }
3485 }
3486
3487 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3488 &mod_java_tool_options_args,
3489 &cur_java_tool_options_args);
3490 if (code != JNI_OK) {
3491 return code;
3492 }
3493
3494 code = expand_vm_options_as_needed(initial_cmd_args,
3495 &mod_cmd_args,
3496 &cur_cmd_args);
3497 if (code != JNI_OK) {
3498 return code;
3499 }
3500
3501 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3502 &mod_java_options_args,
3503 &cur_java_options_args);
3504 if (code != JNI_OK) {
3505 return code;
3506 }
3507
3508 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3509 &mod_vm_options_args,
3510 &cur_vm_options_args);
3511 if (code != JNI_OK) {
3512 return code;
3513 }
3514
3515 const char* flags_file = Arguments::get_jvm_flags_file();
3516 settings_file_specified = (flags_file != nullptr);
3517
3518 if (IgnoreUnrecognizedVMOptions) {
3519 cur_cmd_args->ignoreUnrecognized = true;
3520 cur_java_tool_options_args->ignoreUnrecognized = true;
3521 cur_java_options_args->ignoreUnrecognized = true;
3522 }
3523
3524 // Parse specified settings file
3525 if (settings_file_specified) {
3526 if (!process_settings_file(flags_file, true,
3527 cur_cmd_args->ignoreUnrecognized)) {
3528 return JNI_EINVAL;
3529 }
3530 } else {
3531 #ifdef ASSERT
3532 // Parse default .hotspotrc settings file
3533 if (!process_settings_file(".hotspotrc", false,
3534 cur_cmd_args->ignoreUnrecognized)) {
3535 return JNI_EINVAL;
3536 }
3537 #else
3538 struct stat buf;
3539 if (os::stat(hotspotrc, &buf) == 0) {
3540 needs_hotspotrc_warning = true;
3541 }
3542 #endif
3543 }
3544
3545 if (PrintVMOptions) {
3546 print_options(cur_java_tool_options_args);
3547 print_options(cur_cmd_args);
3548 print_options(cur_java_options_args);
3549 }
3550
3551 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3552 jint result = parse_vm_init_args(cur_vm_options_args,
3553 cur_java_tool_options_args,
3554 cur_java_options_args,
3555 cur_cmd_args);
3556
3557 if (result != JNI_OK) {
3558 return result;
3559 }
3560
3561 // Delay warning until here so that we've had a chance to process
3562 // the -XX:-PrintWarnings flag
3563 if (needs_hotspotrc_warning) {
3564 warning("%s file is present but has been ignored. "
3565 "Run with -XX:Flags=%s to load the file.",
3566 hotspotrc, hotspotrc);
3567 }
3568
3569 if (needs_module_property_warning) {
3570 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3571 " names that are reserved for internal use.");
3572 }
3573
3574 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3575 UNSUPPORTED_OPTION(UseLargePages);
3576 #endif
3577
3578 #if defined(AIX)
3579 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3580 #endif
3581
3582 #ifndef PRODUCT
3583 if (TraceBytecodesAt != 0) {
3584 TraceBytecodes = true;
3585 }
3586 #endif // PRODUCT
3587
3588 if (ScavengeRootsInCode == 0) {
3589 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3590 warning("Forcing ScavengeRootsInCode non-zero");
3591 }
3592 ScavengeRootsInCode = 1;
3593 }
3594
3595 if (!handle_deprecated_print_gc_flags()) {
3596 return JNI_EINVAL;
3597 }
3598
3599 // Set object alignment values.
3600 set_object_alignment();
3601
3602 #if !INCLUDE_CDS
3603 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3604 jio_fprintf(defaultStream::error_stream(),
3605 "Shared spaces are not supported in this VM\n");
3606 return JNI_ERR;
3607 }
3608 if (DumpLoadedClassList != nullptr) {
3609 jio_fprintf(defaultStream::error_stream(),
3610 "DumpLoadedClassList is not supported in this VM\n");
3611 return JNI_ERR;
3612 }
3613 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3614 log_is_enabled(Info, cds)) {
3615 warning("Shared spaces are not supported in this VM");
3616 UseSharedSpaces = false;
3617 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3618 }
3619 no_shared_spaces("CDS Disabled");
3620 #endif // INCLUDE_CDS
3621
3622 // Verify NMT arguments
3623 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3624 if (lvl == NMT_unknown) {
3625 jio_fprintf(defaultStream::error_stream(),
3626 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3627 return JNI_ERR;
3628 }
3629 if (PrintNMTStatistics && lvl == NMT_off) {
3630 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3631 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3632 }
3633
3634 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3635 if (trace_dependencies && VerifyDependencies) {
3636 warning("dependency logging results may be inflated by VerifyDependencies");
3637 }
3638
3639 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3640 log_is_enabled(Info, class, load, cause);
3641 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3642 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3643 }
3644
3645 apply_debugger_ergo();
3646
3647 // The VMThread needs to stop now and then to execute these debug options.
3648 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3649 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3650 }
3651
3652 if (log_is_enabled(Info, arguments)) {
3653 LogStream st(Log(arguments)::info());
3654 Arguments::print_on(&st);
3655 }
3656
3657 #ifdef _LP64
3658 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3659 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3660 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3661 }
3662 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3663 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3664 }
3665 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3666 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3667 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3668 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3669
3670 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3671 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3672 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3673 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3674 } else {
3675 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3676 }
3677 }
3678 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3679 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3680 }
3681 ObjLayout::initialize();
3682 #endif
3683
3684 return JNI_OK;
3685 }
3686
3687 jint Arguments::apply_ergo() {
3688 // Set flags based on ergonomics.
3689 jint result = set_ergonomics_flags();
3690 if (result != JNI_OK) return result;
3691
3692 // Set heap size based on available physical memory
3693 set_heap_size();
3694
3695 GCConfig::arguments()->initialize();
3696
3697 if (UseCompressedClassPointers) {
3698 CompressedKlassPointers::pre_initialize();
3699 }
3700
3701 CDSConfig::initialize();
3702
3703 // Initialize Metaspace flags and alignments
3704 Metaspace::ergo_initialize();
3705
3706 if (!StringDedup::ergo_initialize()) {
3707 return JNI_EINVAL;
3708 }
3709
3710 // Set compiler flags after GC is selected and GC specific
3711 // flags (LoopStripMiningIter) are set.
3712 CompilerConfig::ergo_initialize();
3713
3714 // Set bytecode rewriting flags
3715 set_bytecode_flags();
3716
3717 // Set flags if aggressive optimization flags are enabled
3718 jint code = set_aggressive_opts_flags();
3719 if (code != JNI_OK) {
3720 return code;
3721 }
3722
3723 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3724 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3725 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3726 warning("UseSecondarySupersTable is not supported");
3727 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3728 }
3729 if (!UseSecondarySupersTable) {
3730 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3731 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3732 }
3733
3734 #ifdef ZERO
3735 // Clear flags not supported on zero.
3736 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3737 #endif // ZERO
3738
3739 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3740 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3741 DebugNonSafepoints = true;
3742 }
3743
3744 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3745 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3746 }
3747
3748 // Treat the odd case where local verification is enabled but remote
3749 // verification is not as if both were enabled.
3750 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3751 log_info(verification)("Turning on remote verification because local verification is on");
3752 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3753 }
3754
3755 #ifndef PRODUCT
3756 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3757 if (use_vm_log()) {
3758 LogVMOutput = true;
3759 }
3760 }
3761 #endif // PRODUCT
3762
3763 if (PrintCommandLineFlags) {
3764 JVMFlag::printSetFlags(tty);
3765 }
3766
3767 #if COMPILER2_OR_JVMCI
3768 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3769 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3770 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3771 }
3772 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3773
3774 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3775 if (!EnableVectorReboxing) {
3776 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3777 } else {
3778 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3779 }
3780 }
3781 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3782
3783 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3784 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3785 }
3786 FLAG_SET_DEFAULT(UseVectorStubs, false);
3787 }
3788 #endif // COMPILER2_OR_JVMCI
3789
3790 if (log_is_enabled(Info, perf, class, link)) {
3791 if (!UsePerfData) {
3792 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3793 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3794 }
3795 }
3796
3797 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3798 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3799 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3800 }
3801 }
3802 return JNI_OK;
3803 }
3804
3805 jint Arguments::adjust_after_os() {
3806 if (UseNUMA) {
3807 if (UseParallelGC) {
3808 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3809 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3810 }
3811 }
3812 }
3813 return JNI_OK;
3814 }
3815
3816 int Arguments::PropertyList_count(SystemProperty* pl) {
3817 int count = 0;
3818 while(pl != nullptr) {
3819 count++;
3820 pl = pl->next();
3821 }
3822 return count;
3823 }
3824
3825 // Return the number of readable properties.
3826 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3827 int count = 0;
3828 while(pl != nullptr) {
3829 if (pl->readable()) {
3830 count++;
3831 }
3832 pl = pl->next();
3833 }
3834 return count;
3835 }
3836
3837 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3838 assert(key != nullptr, "just checking");
3839 SystemProperty* prop;
3840 for (prop = pl; prop != nullptr; prop = prop->next()) {
3841 if (strcmp(key, prop->key()) == 0) return prop->value();
3842 }
3843 return nullptr;
3844 }
3845
3846 // Return the value of the requested property provided that it is a readable property.
3847 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3848 assert(key != nullptr, "just checking");
3849 SystemProperty* prop;
3850 // Return the property value if the keys match and the property is not internal or
3851 // it's the special internal property "jdk.boot.class.path.append".
3852 for (prop = pl; prop != nullptr; prop = prop->next()) {
3853 if (strcmp(key, prop->key()) == 0) {
3854 if (!prop->internal()) {
3855 return prop->value();
3856 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3857 return prop->value();
3858 } else {
3859 // Property is internal and not jdk.boot.class.path.append so return null.
3860 return nullptr;
3861 }
3862 }
3863 }
3864 return nullptr;
3865 }
3866
3867 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3868 SystemProperty* p = *plist;
3869 if (p == nullptr) {
3870 *plist = new_p;
3871 } else {
3872 while (p->next() != nullptr) {
3873 p = p->next();
3874 }
3875 p->set_next(new_p);
3876 }
3877 }
3878
3879 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3880 bool writeable, bool internal) {
3881 if (plist == nullptr)
3882 return;
3883
3884 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3885 PropertyList_add(plist, new_p);
3886 }
3887
3888 void Arguments::PropertyList_add(SystemProperty *element) {
3889 PropertyList_add(&_system_properties, element);
3890 }
3891
3892 // This add maintains unique property key in the list.
3893 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3894 PropertyAppendable append, PropertyWriteable writeable,
3895 PropertyInternal internal) {
3896 if (plist == nullptr)
3897 return;
3898
3899 // If property key exists and is writeable, then update with new value.
3900 // Trying to update a non-writeable property is silently ignored.
3901 SystemProperty* prop;
3902 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3903 if (strcmp(k, prop->key()) == 0) {
3904 if (append == AppendProperty) {
3905 prop->append_writeable_value(v);
3906 } else {
3907 prop->set_writeable_value(v);
3908 }
3909 return;
3910 }
3911 }
3912
3913 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3914 }
3915
3916 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3917 // Returns true if all of the source pointed by src has been copied over to
3918 // the destination buffer pointed by buf. Otherwise, returns false.
3919 // Notes:
3920 // 1. If the length (buflen) of the destination buffer excluding the
3921 // null terminator character is not long enough for holding the expanded
3922 // pid characters, it also returns false instead of returning the partially
3923 // expanded one.
3924 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3925 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3926 char* buf, size_t buflen) {
3927 const char* p = src;
3928 char* b = buf;
3929 const char* src_end = &src[srclen];
3930 char* buf_end = &buf[buflen - 1];
3931
3932 while (p < src_end && b < buf_end) {
3933 if (*p == '%') {
3934 switch (*(++p)) {
3935 case '%': // "%%" ==> "%"
3936 *b++ = *p++;
3937 break;
3938 case 'p': { // "%p" ==> current process id
3939 // buf_end points to the character before the last character so
3940 // that we could write '\0' to the end of the buffer.
3941 size_t buf_sz = buf_end - b + 1;
3942 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3943
3944 // if jio_snprintf fails or the buffer is not long enough to hold
3945 // the expanded pid, returns false.
3946 if (ret < 0 || ret >= (int)buf_sz) {
3947 return false;
3948 } else {
3949 b += ret;
3950 assert(*b == '\0', "fail in copy_expand_pid");
3951 if (p == src_end && b == buf_end + 1) {
3952 // reach the end of the buffer.
3953 return true;
3954 }
3955 }
3956 p++;
3957 break;
3958 }
3959 default :
3960 *b++ = '%';
3961 }
3962 } else {
3963 *b++ = *p++;
3964 }
3965 }
3966 *b = '\0';
3967 return (p == src_end); // return false if not all of the source was copied
3968 }