1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "compiler/compilerDefinitions.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/checkedCast.hpp"
68 #include "utilities/debug.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/parseInteger.hpp"
72 #include "utilities/powerOfTwo.hpp"
73 #include "utilities/stringUtils.hpp"
74 #include "utilities/systemMemoryBarrier.hpp"
75 #if INCLUDE_JFR
76 #include "jfr/jfr.hpp"
77 #endif
78
79 #include <limits>
80
81 static const char _default_java_launcher[] = "generic";
82
83 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
84
85 char* Arguments::_jvm_flags_file = nullptr;
86 char** Arguments::_jvm_flags_array = nullptr;
87 int Arguments::_num_jvm_flags = 0;
88 char** Arguments::_jvm_args_array = nullptr;
89 int Arguments::_num_jvm_args = 0;
90 unsigned int Arguments::_addmods_count = 0;
91 char* Arguments::_java_command = nullptr;
92 SystemProperty* Arguments::_system_properties = nullptr;
93 size_t Arguments::_conservative_max_heap_alignment = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 const char* Arguments::_java_vendor_url_bug = nullptr;
96 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
97 bool Arguments::_sun_java_launcher_is_altjvm = false;
98
99 // These parameters are reset in method parse_vm_init_args()
100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
102 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
103 bool Arguments::_ClipInlining = ClipInlining;
104 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
105
106 bool Arguments::_enable_preview = false;
107
108 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
109
110 // These are not set by the JDK's built-in launchers, but they can be set by
111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
112 // JavaVMOption in jni.h.
113 abort_hook_t Arguments::_abort_hook = nullptr;
114 exit_hook_t Arguments::_exit_hook = nullptr;
115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
119 SystemProperty *Arguments::_java_library_path = nullptr;
120 SystemProperty *Arguments::_java_home = nullptr;
121 SystemProperty *Arguments::_java_class_path = nullptr;
122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
123 SystemProperty *Arguments::_vm_info = nullptr;
124
125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
126 PathString *Arguments::_boot_class_path = nullptr;
127 bool Arguments::_has_jimage = false;
128
129 char* Arguments::_ext_dirs = nullptr;
130
131 // True if -Xshare:auto option was specified.
132 static bool xshare_auto_cmd_line = false;
133
134 // True if -Xint/-Xmixed/-Xcomp were specified
135 static bool mode_flag_cmd_line = false;
136
137 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
138 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
139 if (new_value == nullptr) {
140 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
141 return false;
142 }
143 if (_value != nullptr) {
144 FreeHeap(_value);
145 }
146 _value = new_value;
147 strcpy(_value, value);
148 return true;
149 }
150
151 void PathString::append_value(const char *value) {
152 char *sp;
153 size_t len = 0;
154 if (value != nullptr) {
155 len = strlen(value);
156 if (_value != nullptr) {
157 len += strlen(_value);
158 }
159 sp = AllocateHeap(len+2, mtArguments);
160 assert(sp != nullptr, "Unable to allocate space for new append path value");
161 if (sp != nullptr) {
162 if (_value != nullptr) {
163 strcpy(sp, _value);
164 strcat(sp, os::path_separator());
165 strcat(sp, value);
166 FreeHeap(_value);
167 } else {
168 strcpy(sp, value);
169 }
170 _value = sp;
171 }
172 }
173 }
174
175 PathString::PathString(const char* value) {
176 if (value == nullptr) {
177 _value = nullptr;
178 } else {
179 _value = AllocateHeap(strlen(value)+1, mtArguments);
180 strcpy(_value, value);
181 }
182 }
183
184 PathString::~PathString() {
185 if (_value != nullptr) {
186 FreeHeap(_value);
187 _value = nullptr;
188 }
189 }
190
191 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
192 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
193 size_t len = strlen(module_name) + 1;
194 _module_name = AllocateHeap(len, mtInternal);
195 strncpy(_module_name, module_name, len); // copy the trailing null
196 _path = new PathString(path);
197 }
198
199 ModulePatchPath::~ModulePatchPath() {
200 if (_module_name != nullptr) {
201 FreeHeap(_module_name);
202 _module_name = nullptr;
203 }
204 if (_path != nullptr) {
205 delete _path;
206 _path = nullptr;
207 }
208 }
209
210 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
211 if (key == nullptr) {
212 _key = nullptr;
213 } else {
214 _key = AllocateHeap(strlen(key)+1, mtArguments);
215 strcpy(_key, key);
216 }
217 _next = nullptr;
218 _internal = internal;
219 _writeable = writeable;
220 }
221
222 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
223 // part of the option string.
224 static bool match_option(const JavaVMOption *option, const char* name,
225 const char** tail) {
226 size_t len = strlen(name);
227 if (strncmp(option->optionString, name, len) == 0) {
228 *tail = option->optionString + len;
229 return true;
230 } else {
231 return false;
232 }
233 }
234
235 // Check if 'option' matches 'name'. No "tail" is allowed.
236 static bool match_option(const JavaVMOption *option, const char* name) {
237 const char* tail = nullptr;
238 bool result = match_option(option, name, &tail);
239 if (tail != nullptr && *tail == '\0') {
240 return result;
241 } else {
242 return false;
243 }
244 }
245
246 // Return true if any of the strings in null-terminated array 'names' matches.
247 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
248 // the option must match exactly.
249 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
250 bool tail_allowed) {
251 for (/* empty */; *names != nullptr; ++names) {
252 if (match_option(option, *names, tail)) {
253 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
254 return true;
255 }
256 }
257 }
258 return false;
259 }
260
261 #if INCLUDE_JFR
262 static bool _has_jfr_option = false; // is using JFR
263
264 // return true on failure
265 static bool match_jfr_option(const JavaVMOption** option) {
266 assert((*option)->optionString != nullptr, "invariant");
267 char* tail = nullptr;
268 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_start_flight_recording_option(option, tail);
271 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
272 _has_jfr_option = true;
273 return Jfr::on_flight_recorder_option(option, tail);
274 }
275 return false;
276 }
277
278 bool Arguments::has_jfr_option() {
279 return _has_jfr_option;
280 }
281 #endif
282
283 static void logOption(const char* opt) {
284 if (PrintVMOptions) {
285 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
286 }
287 }
288
289 bool needs_module_property_warning = false;
290
291 #define MODULE_PROPERTY_PREFIX "jdk.module."
292 #define MODULE_PROPERTY_PREFIX_LEN 11
293 #define ADDEXPORTS "addexports"
294 #define ADDEXPORTS_LEN 10
295 #define ADDREADS "addreads"
296 #define ADDREADS_LEN 8
297 #define ADDOPENS "addopens"
298 #define ADDOPENS_LEN 8
299 #define PATCH "patch"
300 #define PATCH_LEN 5
301 #define ADDMODS "addmods"
302 #define ADDMODS_LEN 7
303 #define LIMITMODS "limitmods"
304 #define LIMITMODS_LEN 9
305 #define PATH "path"
306 #define PATH_LEN 4
307 #define UPGRADE_PATH "upgrade.path"
308 #define UPGRADE_PATH_LEN 12
309 #define ENABLE_NATIVE_ACCESS "enable.native.access"
310 #define ENABLE_NATIVE_ACCESS_LEN 20
311 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
312 #define ILLEGAL_NATIVE_ACCESS_LEN 21
313
314 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
315 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
316 return ((strncmp(option, property, len) == 0) &&
317 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
318 }
319
320 // Return true if property starts with "jdk.module." and its ensuing chars match
321 // any of the reserved module properties.
322 // property should be passed without the leading "-D".
323 bool Arguments::is_internal_module_property(const char* property) {
324 return internal_module_property_helper(property, false);
325 }
326
327 // Returns true if property is one of those recognized by is_internal_module_property() but
328 // is not supported by CDS archived full module graph.
329 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
330 return internal_module_property_helper(property, true);
331 }
332
333 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
334 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
335 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
336 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
337 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
338 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
339 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
340 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
341 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
342 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
343 return true;
344 }
345
346 if (!check_for_cds) {
347 // CDS notes: these properties are supported by CDS archived full module graph.
348 if (matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
350 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
351 return true;
352 }
353 }
354 }
355 return false;
356 }
357
358 // Process java launcher properties.
359 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
360 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
361 // Must do this before setting up other system properties,
362 // as some of them may depend on launcher type.
363 for (int index = 0; index < args->nOptions; index++) {
364 const JavaVMOption* option = args->options + index;
365 const char* tail;
366
367 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
368 process_java_launcher_argument(tail, option->extraInfo);
369 continue;
370 }
371 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
372 if (strcmp(tail, "true") == 0) {
373 _sun_java_launcher_is_altjvm = true;
374 }
375 continue;
376 }
377 }
378 }
379
380 // Initialize system properties key and value.
381 void Arguments::init_system_properties() {
382
383 // Set up _boot_class_path which is not a property but
384 // relies heavily on argument processing and the jdk.boot.class.path.append
385 // property. It is used to store the underlying boot class path.
386 _boot_class_path = new PathString(nullptr);
387
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
389 "Java Virtual Machine Specification", false));
390 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
392 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
393
394 // Initialize the vm.info now, but it will need updating after argument parsing.
395 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
396
397 // Following are JVMTI agent writable properties.
398 // Properties values are set to nullptr and they are
399 // os specific they are initialized in os::init_system_properties_values().
400 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
401 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
402 _java_home = new SystemProperty("java.home", nullptr, true);
403 _java_class_path = new SystemProperty("java.class.path", "", true);
404 // jdk.boot.class.path.append is a non-writeable, internal property.
405 // It can only be set by either:
406 // - -Xbootclasspath/a:
407 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
408 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
409
410 // Add to System Property list.
411 PropertyList_add(&_system_properties, _sun_boot_library_path);
412 PropertyList_add(&_system_properties, _java_library_path);
413 PropertyList_add(&_system_properties, _java_home);
414 PropertyList_add(&_system_properties, _java_class_path);
415 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
416 PropertyList_add(&_system_properties, _vm_info);
417
418 // Set OS specific system properties values
419 os::init_system_properties_values();
420 }
421
422 // Update/Initialize System properties after JDK version number is known
423 void Arguments::init_version_specific_system_properties() {
424 enum { bufsz = 16 };
425 char buffer[bufsz];
426 const char* spec_vendor = "Oracle Corporation";
427 uint32_t spec_version = JDK_Version::current().major_version();
428
429 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
430
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.specification.version", buffer, false));
435 PropertyList_add(&_system_properties,
436 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
437 }
438
439 /*
440 * -XX argument processing:
441 *
442 * -XX arguments are defined in several places, such as:
443 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
444 * -XX arguments are parsed in parse_argument().
445 * -XX argument bounds checking is done in check_vm_args_consistency().
446 *
447 * Over time -XX arguments may change. There are mechanisms to handle common cases:
448 *
449 * ALIASED: An option that is simply another name for another option. This is often
450 * part of the process of deprecating a flag, but not all aliases need
451 * to be deprecated.
452 *
453 * Create an alias for an option by adding the old and new option names to the
454 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
455 *
456 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
457 * support may be removed in the future. Both regular and aliased options may be
458 * deprecated.
459 *
460 * Add a deprecation warning for an option (or alias) by adding an entry in the
461 * "special_jvm_flags" table and setting the "deprecated_in" field.
462 * Often an option "deprecated" in one major release will
463 * be made "obsolete" in the next. In this case the entry should also have its
464 * "obsolete_in" field set.
465 *
466 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
467 * on the command line. A warning is printed to let the user know that option might not
468 * be accepted in the future.
469 *
470 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
471 * table and setting the "obsolete_in" field.
472 *
473 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
474 * to the current JDK version. The system will flatly refuse to admit the existence of
475 * the flag. This allows a flag to die automatically over JDK releases.
476 *
477 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
478 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
479 * - Newly obsolete or expired deprecated options should have their global variable
480 * definitions removed (from globals.hpp, etc) and related implementations removed.
481 *
482 * Recommended approach for removing options:
483 *
484 * To remove options commonly used by customers (e.g. product -XX options), use
485 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
486 *
487 * To remove internal options (e.g. diagnostic, experimental, develop options), use
488 * a 2-step model adding major release numbers to the obsolete and expire columns.
489 *
490 * To change the name of an option, use the alias table as well as a 2-step
491 * model adding major release numbers to the deprecate and expire columns.
492 * Think twice about aliasing commonly used customer options.
493 *
494 * There are times when it is appropriate to leave a future release number as undefined.
495 *
496 * Tests: Aliases should be tested in VMAliasOptions.java.
497 * Deprecated options should be tested in VMDeprecatedOptions.java.
498 */
499
500 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
501 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
502 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
503 // the command-line as usual, but will issue a warning.
504 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
505 // the command-line, while issuing a warning and ignoring the flag value.
506 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
507 // existence of the flag.
508 //
509 // MANUAL CLEANUP ON JDK VERSION UPDATES:
510 // This table ensures that the handling of options will update automatically when the JDK
511 // version is incremented, but the source code needs to be cleanup up manually:
512 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
513 // variable should be removed, as well as users of the variable.
514 // - As "deprecated" options age into "obsolete" options, move the entry into the
515 // "Obsolete Flags" section of the table.
516 // - All expired options should be removed from the table.
517 static SpecialFlag const special_jvm_flags[] = {
518 // -------------- Deprecated Flags --------------
519 // --- Non-alias flags - sorted by obsolete_in then expired_in:
520 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
524 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
525 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
526 #ifdef LINUX
527 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
528 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
529 #endif
530 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
531 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
532 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
533
534 // -------------- Obsolete Flags - sorted by expired_in --------------
535
536 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
537 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
538
539 #ifdef ASSERT
540 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
541 #endif
542
543 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
544 // These entries will generate build errors. Their purpose is to test the macros.
545 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
546 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
547 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
548 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
549 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 #endif
553
554 { nullptr, JDK_Version(0), JDK_Version(0) }
555 };
556
557 // Flags that are aliases for other flags.
558 typedef struct {
559 const char* alias_name;
560 const char* real_name;
561 } AliasedFlag;
562
563 static AliasedFlag const aliased_jvm_flags[] = {
564 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
565 { nullptr, nullptr}
566 };
567
568 // Return true if "v" is less than "other", where "other" may be "undefined".
569 static bool version_less_than(JDK_Version v, JDK_Version other) {
570 assert(!v.is_undefined(), "must be defined");
571 if (!other.is_undefined() && v.compare(other) >= 0) {
572 return false;
573 } else {
574 return true;
575 }
576 }
577
578 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
579 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
580 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
581 flag = special_jvm_flags[i];
582 return true;
583 }
584 }
585 return false;
586 }
587
588 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
589 assert(version != nullptr, "Must provide a version buffer");
590 SpecialFlag flag;
591 if (lookup_special_flag(flag_name, flag)) {
592 if (!flag.obsolete_in.is_undefined()) {
593 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
594 *version = flag.obsolete_in;
595 // This flag may have been marked for obsoletion in this version, but we may not
596 // have actually removed it yet. Rather than ignoring it as soon as we reach
597 // this version we allow some time for the removal to happen. So if the flag
598 // still actually exists we process it as normal, but issue an adjusted warning.
599 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
600 if (real_flag != nullptr) {
601 char version_str[256];
602 version->to_string(version_str, sizeof(version_str));
603 warning("Temporarily processing option %s; support is scheduled for removal in %s",
604 flag_name, version_str);
605 return false;
606 }
607 return true;
608 }
609 }
610 }
611 return false;
612 }
613
614 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
615 assert(version != nullptr, "Must provide a version buffer");
616 SpecialFlag flag;
617 if (lookup_special_flag(flag_name, flag)) {
618 if (!flag.deprecated_in.is_undefined()) {
619 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
620 version_less_than(JDK_Version::current(), flag.expired_in)) {
621 *version = flag.deprecated_in;
622 return 1;
623 } else {
624 return -1;
625 }
626 }
627 }
628 return 0;
629 }
630
631 const char* Arguments::real_flag_name(const char *flag_name) {
632 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
633 const AliasedFlag& flag_status = aliased_jvm_flags[i];
634 if (strcmp(flag_status.alias_name, flag_name) == 0) {
635 return flag_status.real_name;
636 }
637 }
638 return flag_name;
639 }
640
641 #ifdef ASSERT
642 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
643 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
644 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
645 return true;
646 }
647 }
648 return false;
649 }
650
651 // Verifies the correctness of the entries in the special_jvm_flags table.
652 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
653 // version being earlier than the deprecation version, then a warning is issued
654 // and verification fails - by returning false. If it is detected that the table
655 // is out of date, with respect to the current version, then ideally a warning is
656 // issued but verification does not fail. This allows the VM to operate when the
657 // version is first updated, without needing to update all the impacted flags at
658 // the same time. In practice we can't issue the warning immediately when the version
659 // is updated as it occurs for every test and some tests are not prepared to handle
660 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
661 // if the check_globals flag is true, and in addition allow a grace period and only
662 // check for stale flags when we hit build 25 (which is far enough into the 6 month
663 // release cycle that all flag updates should have been processed, whilst still
664 // leaving time to make the change before RDP2).
665 // We use a gtest to call this, passing true, so that we can detect stale flags before
666 // the end of the release cycle.
667
668 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
669
670 bool Arguments::verify_special_jvm_flags(bool check_globals) {
671 bool success = true;
672 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
673 const SpecialFlag& flag = special_jvm_flags[i];
674 if (lookup_special_flag(flag.name, i)) {
675 warning("Duplicate special flag declaration \"%s\"", flag.name);
676 success = false;
677 }
678 if (flag.deprecated_in.is_undefined() &&
679 flag.obsolete_in.is_undefined()) {
680 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
681 success = false;
682 }
683
684 if (!flag.deprecated_in.is_undefined()) {
685 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
686 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
687 success = false;
688 }
689
690 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
691 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
692 success = false;
693 }
694 }
695
696 if (!flag.obsolete_in.is_undefined()) {
697 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
698 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
699 success = false;
700 }
701
702 // if flag has become obsolete it should not have a "globals" flag defined anymore.
703 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
704 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
705 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
706 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
707 success = false;
708 }
709 }
710
711 } else if (!flag.expired_in.is_undefined()) {
712 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
713 success = false;
714 }
715
716 if (!flag.expired_in.is_undefined()) {
717 // if flag has become expired it should not have a "globals" flag defined anymore.
718 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
719 !version_less_than(JDK_Version::current(), flag.expired_in)) {
720 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
721 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
722 success = false;
723 }
724 }
725 }
726 }
727 return success;
728 }
729 #endif
730
731 bool Arguments::atojulong(const char *s, julong* result) {
732 return parse_integer(s, result);
733 }
734
735 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
736 if (size < min_size) return arg_too_small;
737 if (size > max_size) return arg_too_big;
738 return arg_in_range;
739 }
740
741 // Describe an argument out of range error
742 void Arguments::describe_range_error(ArgsRange errcode) {
743 switch(errcode) {
744 case arg_too_big:
745 jio_fprintf(defaultStream::error_stream(),
746 "The specified size exceeds the maximum "
747 "representable size.\n");
748 break;
749 case arg_too_small:
750 case arg_unreadable:
751 case arg_in_range:
752 // do nothing for now
753 break;
754 default:
755 ShouldNotReachHere();
756 }
757 }
758
759 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
760 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
761 return true;
762 } else {
763 return false;
764 }
765 }
766
767 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
768 // strtod allows leading whitespace, but our flag format does not.
769 if (*value == '\0' || isspace((unsigned char) *value)) {
770 return false;
771 }
772 char* end;
773 errno = 0;
774 double v = strtod(value, &end);
775 if ((errno != 0) || (*end != 0)) {
776 return false;
777 }
778 if (g_isnan(v) || !g_isfinite(v)) {
779 // Currently we cannot handle these special values.
780 return false;
781 }
782
783 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
784 return true;
785 }
786 return false;
787 }
788
789 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
790 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
791
792 if (flag->is_int()) {
793 int v;
794 if (parse_integer(value, &v)) {
795 result = JVMFlagAccess::set_int(flag, &v, origin);
796 }
797 } else if (flag->is_uint()) {
798 uint v;
799 if (parse_integer(value, &v)) {
800 result = JVMFlagAccess::set_uint(flag, &v, origin);
801 }
802 } else if (flag->is_intx()) {
803 intx v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_intx(flag, &v, origin);
806 }
807 } else if (flag->is_uintx()) {
808 uintx v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_uintx(flag, &v, origin);
811 }
812 } else if (flag->is_uint64_t()) {
813 uint64_t v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
816 }
817 } else if (flag->is_size_t()) {
818 size_t v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_size_t(flag, &v, origin);
821 }
822 }
823
824 return result == JVMFlag::SUCCESS;
825 }
826
827 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
828 if (value[0] == '\0') {
829 value = nullptr;
830 }
831 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
832 // Contract: JVMFlag always returns a pointer that needs freeing.
833 FREE_C_HEAP_ARRAY(char, value);
834 return true;
835 }
836
837 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
838 const char* old_value = "";
839 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
840 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
841 size_t new_len = strlen(new_value);
842 const char* value;
843 char* free_this_too = nullptr;
844 if (old_len == 0) {
845 value = new_value;
846 } else if (new_len == 0) {
847 value = old_value;
848 } else {
849 size_t length = old_len + 1 + new_len + 1;
850 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
851 // each new setting adds another LINE to the switch:
852 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
853 value = buf;
854 free_this_too = buf;
855 }
856 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
857 // JVMFlag always returns a pointer that needs freeing.
858 FREE_C_HEAP_ARRAY(char, value);
859 // JVMFlag made its own copy, so I must delete my own temp. buffer.
860 FREE_C_HEAP_ARRAY(char, free_this_too);
861 return true;
862 }
863
864 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
865 const char* real_name = real_flag_name(arg);
866 JDK_Version since = JDK_Version();
867 switch (is_deprecated_flag(arg, &since)) {
868 case -1: {
869 // Obsolete or expired, so don't process normally,
870 // but allow for an obsolete flag we're still
871 // temporarily allowing.
872 if (!is_obsolete_flag(arg, &since)) {
873 return real_name;
874 }
875 // Note if we're not considered obsolete then we can't be expired either
876 // as obsoletion must come first.
877 return nullptr;
878 }
879 case 0:
880 return real_name;
881 case 1: {
882 char version[256];
883 since.to_string(version, sizeof(version));
884 if (real_name != arg) {
885 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
886 arg, version, real_name);
887 } else {
888 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
889 arg, version);
890 }
891 return real_name;
892 }
893 }
894 ShouldNotReachHere();
895 return nullptr;
896 }
897
898 #define BUFLEN 255
899
900 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
901 char name_copied[BUFLEN+1];
902 if (name[name_length] != 0) {
903 if (name_length > BUFLEN) {
904 return nullptr;
905 } else {
906 strncpy(name_copied, name, name_length);
907 name_copied[name_length] = '\0';
908 name = name_copied;
909 }
910 }
911
912 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
913 if (real_name == nullptr) {
914 return nullptr;
915 }
916 JVMFlag* flag = JVMFlag::find_flag(real_name);
917 return flag;
918 }
919
920 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
921 bool is_bool = false;
922 bool bool_val = false;
923 char c = *arg;
924 if (c == '+' || c == '-') {
925 is_bool = true;
926 bool_val = (c == '+');
927 arg++;
928 }
929
930 const char* name = arg;
931 while (true) {
932 c = *arg;
933 if (isalnum(c) || (c == '_')) {
934 ++arg;
935 } else {
936 break;
937 }
938 }
939
940 size_t name_len = size_t(arg - name);
941 if (name_len == 0) {
942 return false;
943 }
944
945 JVMFlag* flag = find_jvm_flag(name, name_len);
946 if (flag == nullptr) {
947 return false;
948 }
949
950 if (is_bool) {
951 if (*arg != 0) {
952 // Error -- extra characters such as -XX:+BoolFlag=123
953 return false;
954 }
955 return set_bool_flag(flag, bool_val, origin);
956 }
957
958 if (arg[0] == '=') {
959 const char* value = arg + 1;
960 if (flag->is_ccstr()) {
961 if (flag->ccstr_accumulates()) {
962 return append_to_string_flag(flag, value, origin);
963 } else {
964 return set_string_flag(flag, value, origin);
965 }
966 } else if (flag->is_double()) {
967 return set_fp_numeric_flag(flag, value, origin);
968 } else {
969 return set_numeric_flag(flag, value, origin);
970 }
971 }
972
973 if (arg[0] == ':' && arg[1] == '=') {
974 // -XX:Foo:=xxx will reset the string flag to the given value.
975 const char* value = arg + 2;
976 return set_string_flag(flag, value, origin);
977 }
978
979 return false;
980 }
981
982 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
983 assert(bldarray != nullptr, "illegal argument");
984
985 if (arg == nullptr) {
986 return;
987 }
988
989 int new_count = *count + 1;
990
991 // expand the array and add arg to the last element
992 if (*bldarray == nullptr) {
993 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
994 } else {
995 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
996 }
997 (*bldarray)[*count] = os::strdup_check_oom(arg);
998 *count = new_count;
999 }
1000
1001 void Arguments::build_jvm_args(const char* arg) {
1002 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1003 }
1004
1005 void Arguments::build_jvm_flags(const char* arg) {
1006 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1007 }
1008
1009 // utility function to return a string that concatenates all
1010 // strings in a given char** array
1011 const char* Arguments::build_resource_string(char** args, int count) {
1012 if (args == nullptr || count == 0) {
1013 return nullptr;
1014 }
1015 size_t length = 0;
1016 for (int i = 0; i < count; i++) {
1017 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1018 }
1019 char* s = NEW_RESOURCE_ARRAY(char, length);
1020 char* dst = s;
1021 for (int j = 0; j < count; j++) {
1022 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1023 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1024 dst += offset;
1025 length -= offset;
1026 }
1027 return (const char*) s;
1028 }
1029
1030 void Arguments::print_on(outputStream* st) {
1031 st->print_cr("VM Arguments:");
1032 if (num_jvm_flags() > 0) {
1033 st->print("jvm_flags: "); print_jvm_flags_on(st);
1034 st->cr();
1035 }
1036 if (num_jvm_args() > 0) {
1037 st->print("jvm_args: "); print_jvm_args_on(st);
1038 st->cr();
1039 }
1040 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1041 if (_java_class_path != nullptr) {
1042 char* path = _java_class_path->value();
1043 size_t len = strlen(path);
1044 st->print("java_class_path (initial): ");
1045 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1046 if (len == 0) {
1047 st->print_raw_cr("<not set>");
1048 } else {
1049 st->print_raw_cr(path, len);
1050 }
1051 }
1052 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1053 }
1054
1055 void Arguments::print_summary_on(outputStream* st) {
1056 // Print the command line. Environment variables that are helpful for
1057 // reproducing the problem are written later in the hs_err file.
1058 // flags are from setting file
1059 if (num_jvm_flags() > 0) {
1060 st->print_raw("Settings File: ");
1061 print_jvm_flags_on(st);
1062 st->cr();
1063 }
1064 // args are the command line and environment variable arguments.
1065 st->print_raw("Command Line: ");
1066 if (num_jvm_args() > 0) {
1067 print_jvm_args_on(st);
1068 }
1069 // this is the classfile and any arguments to the java program
1070 if (java_command() != nullptr) {
1071 st->print("%s", java_command());
1072 }
1073 st->cr();
1074 }
1075
1076 void Arguments::print_jvm_flags_on(outputStream* st) {
1077 if (_num_jvm_flags > 0) {
1078 for (int i=0; i < _num_jvm_flags; i++) {
1079 st->print("%s ", _jvm_flags_array[i]);
1080 }
1081 }
1082 }
1083
1084 void Arguments::print_jvm_args_on(outputStream* st) {
1085 if (_num_jvm_args > 0) {
1086 for (int i=0; i < _num_jvm_args; i++) {
1087 st->print("%s ", _jvm_args_array[i]);
1088 }
1089 }
1090 }
1091
1092 bool Arguments::process_argument(const char* arg,
1093 jboolean ignore_unrecognized,
1094 JVMFlagOrigin origin) {
1095 JDK_Version since = JDK_Version();
1096
1097 if (parse_argument(arg, origin)) {
1098 return true;
1099 }
1100
1101 // Determine if the flag has '+', '-', or '=' characters.
1102 bool has_plus_minus = (*arg == '+' || *arg == '-');
1103 const char* const argname = has_plus_minus ? arg + 1 : arg;
1104
1105 size_t arg_len;
1106 const char* equal_sign = strchr(argname, '=');
1107 if (equal_sign == nullptr) {
1108 arg_len = strlen(argname);
1109 } else {
1110 arg_len = equal_sign - argname;
1111 }
1112
1113 // Only make the obsolete check for valid arguments.
1114 if (arg_len <= BUFLEN) {
1115 // Construct a string which consists only of the argument name without '+', '-', or '='.
1116 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1117 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1118 if (is_obsolete_flag(stripped_argname, &since)) {
1119 char version[256];
1120 since.to_string(version, sizeof(version));
1121 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1122 return true;
1123 }
1124 }
1125
1126 // For locked flags, report a custom error message if available.
1127 // Otherwise, report the standard unrecognized VM option.
1128 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1129 if (found_flag != nullptr) {
1130 char locked_message_buf[BUFLEN];
1131 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1132 if (strlen(locked_message_buf) != 0) {
1133 #ifdef PRODUCT
1134 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1135 if (ignore_unrecognized && mismatched) {
1136 return true;
1137 }
1138 #endif
1139 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1140 }
1141 if (found_flag->is_bool() && !has_plus_minus) {
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Missing +/- setting for VM option '%s'\n", argname);
1144 } else if (!found_flag->is_bool() && has_plus_minus) {
1145 jio_fprintf(defaultStream::error_stream(),
1146 "Unexpected +/- setting in VM option '%s'\n", argname);
1147 } else {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Improperly specified VM option '%s'\n", argname);
1150 }
1151 } else {
1152 if (ignore_unrecognized) {
1153 return true;
1154 }
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Unrecognized VM option '%s'\n", argname);
1157 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1158 if (fuzzy_matched != nullptr) {
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Did you mean '%s%s%s'?\n",
1161 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1162 fuzzy_matched->name(),
1163 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1164 }
1165 }
1166
1167 // allow for commandline "commenting out" options like -XX:#+Verbose
1168 return arg[0] == '#';
1169 }
1170
1171 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1172 FILE* stream = os::fopen(file_name, "rb");
1173 if (stream == nullptr) {
1174 if (should_exist) {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Could not open settings file %s\n", file_name);
1177 return false;
1178 } else {
1179 return true;
1180 }
1181 }
1182
1183 char token[1024];
1184 int pos = 0;
1185
1186 bool in_white_space = true;
1187 bool in_comment = false;
1188 bool in_quote = false;
1189 int quote_c = 0;
1190 bool result = true;
1191
1192 int c = getc(stream);
1193 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1194 if (in_white_space) {
1195 if (in_comment) {
1196 if (c == '\n') in_comment = false;
1197 } else {
1198 if (c == '#') in_comment = true;
1199 else if (!isspace((unsigned char) c)) {
1200 in_white_space = false;
1201 token[pos++] = checked_cast<char>(c);
1202 }
1203 }
1204 } else {
1205 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1206 // token ends at newline, or at unquoted whitespace
1207 // this allows a way to include spaces in string-valued options
1208 token[pos] = '\0';
1209 logOption(token);
1210 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1211 build_jvm_flags(token);
1212 pos = 0;
1213 in_white_space = true;
1214 in_quote = false;
1215 } else if (!in_quote && (c == '\'' || c == '"')) {
1216 in_quote = true;
1217 quote_c = c;
1218 } else if (in_quote && (c == quote_c)) {
1219 in_quote = false;
1220 } else {
1221 token[pos++] = checked_cast<char>(c);
1222 }
1223 }
1224 c = getc(stream);
1225 }
1226 if (pos > 0) {
1227 token[pos] = '\0';
1228 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1229 build_jvm_flags(token);
1230 }
1231 fclose(stream);
1232 return result;
1233 }
1234
1235 //=============================================================================================================
1236 // Parsing of properties (-D)
1237
1238 const char* Arguments::get_property(const char* key) {
1239 return PropertyList_get_value(system_properties(), key);
1240 }
1241
1242 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1243 const char* eq = strchr(prop, '=');
1244 const char* key;
1245 const char* value = "";
1246
1247 if (eq == nullptr) {
1248 // property doesn't have a value, thus use passed string
1249 key = prop;
1250 } else {
1251 // property have a value, thus extract it and save to the
1252 // allocated string
1253 size_t key_len = eq - prop;
1254 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1255
1256 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1257 key = tmp_key;
1258
1259 value = &prop[key_len + 1];
1260 }
1261
1262 if (internal == ExternalProperty) {
1263 CDSConfig::check_incompatible_property(key, value);
1264 }
1265
1266 if (strcmp(key, "java.compiler") == 0) {
1267 // we no longer support java.compiler system property, log a warning and let it get
1268 // passed to Java, like any other system property
1269 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1270 // for applications using NONE or empty value, log a more informative message
1271 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1272 } else {
1273 warning("The java.compiler system property is obsolete and no longer supported.");
1274 }
1275 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1276 // sun.java.launcher.is_altjvm property is
1277 // private and is processed in process_sun_java_launcher_properties();
1278 // the sun.java.launcher property is passed on to the java application
1279 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1280 // append is true, writable is true, internal is false
1281 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1282 WriteableProperty, ExternalProperty);
1283 } else {
1284 if (strcmp(key, "sun.java.command") == 0) {
1285 char *old_java_command = _java_command;
1286 _java_command = os::strdup_check_oom(value, mtArguments);
1287 if (old_java_command != nullptr) {
1288 os::free(old_java_command);
1289 }
1290 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1291 // If this property is set on the command line then its value will be
1292 // displayed in VM error logs as the URL at which to submit such logs.
1293 // Normally the URL displayed in error logs is different from the value
1294 // of this system property, so a different property should have been
1295 // used here, but we leave this as-is in case someone depends upon it.
1296 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1297 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1298 // its value without going through the property list or making a Java call.
1299 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1300 if (old_java_vendor_url_bug != nullptr) {
1301 os::free((void *)old_java_vendor_url_bug);
1302 }
1303 }
1304
1305 // Create new property and add at the end of the list
1306 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1307 }
1308
1309 if (key != prop) {
1310 // SystemProperty copy passed value, thus free previously allocated
1311 // memory
1312 FreeHeap((void *)key);
1313 }
1314
1315 return true;
1316 }
1317
1318 //===========================================================================================================
1319 // Setting int/mixed/comp mode flags
1320
1321 void Arguments::set_mode_flags(Mode mode) {
1322 // Set up default values for all flags.
1323 // If you add a flag to any of the branches below,
1324 // add a default value for it here.
1325 _mode = mode;
1326
1327 // Ensure Agent_OnLoad has the correct initial values.
1328 // This may not be the final mode; mode may change later in onload phase.
1329 PropertyList_unique_add(&_system_properties, "java.vm.info",
1330 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1331
1332 UseInterpreter = true;
1333 UseCompiler = true;
1334 UseLoopCounter = true;
1335
1336 // Default values may be platform/compiler dependent -
1337 // use the saved values
1338 ClipInlining = Arguments::_ClipInlining;
1339 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1340 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1341 BackgroundCompilation = Arguments::_BackgroundCompilation;
1342
1343 // Change from defaults based on mode
1344 switch (mode) {
1345 default:
1346 ShouldNotReachHere();
1347 break;
1348 case _int:
1349 UseCompiler = false;
1350 UseLoopCounter = false;
1351 AlwaysCompileLoopMethods = false;
1352 UseOnStackReplacement = false;
1353 break;
1354 case _mixed:
1355 // same as default
1356 break;
1357 case _comp:
1358 UseInterpreter = false;
1359 BackgroundCompilation = false;
1360 ClipInlining = false;
1361 break;
1362 }
1363 }
1364
1365 // Conflict: required to use shared spaces (-Xshare:on), but
1366 // incompatible command line options were chosen.
1367 void Arguments::no_shared_spaces(const char* message) {
1368 if (RequireSharedSpaces) {
1369 jio_fprintf(defaultStream::error_stream(),
1370 "Class data sharing is inconsistent with other specified options.\n");
1371 vm_exit_during_initialization("Unable to use shared archive", message);
1372 } else {
1373 log_info(cds)("Unable to use shared archive: %s", message);
1374 UseSharedSpaces = false;
1375 }
1376 }
1377
1378 static void set_object_alignment() {
1379 // Object alignment.
1380 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1381 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1382 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1383 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1384 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1385 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1386
1387 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1388 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1389
1390 // Oop encoding heap max
1391 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1392 }
1393
1394 size_t Arguments::max_heap_for_compressed_oops() {
1395 // Avoid sign flip.
1396 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1397 // We need to fit both the null page and the heap into the memory budget, while
1398 // keeping alignment constraints of the heap. To guarantee the latter, as the
1399 // null page is located before the heap, we pad the null page to the conservative
1400 // maximum alignment that the GC may ever impose upon the heap.
1401 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1402 _conservative_max_heap_alignment);
1403
1404 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1405 NOT_LP64(ShouldNotReachHere(); return 0);
1406 }
1407
1408 void Arguments::set_use_compressed_oops() {
1409 #ifdef _LP64
1410 // MaxHeapSize is not set up properly at this point, but
1411 // the only value that can override MaxHeapSize if we are
1412 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1413 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1414
1415 if (max_heap_size <= max_heap_for_compressed_oops()) {
1416 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1417 FLAG_SET_ERGO(UseCompressedOops, true);
1418 }
1419 } else {
1420 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1421 warning("Max heap size too large for Compressed Oops");
1422 FLAG_SET_DEFAULT(UseCompressedOops, false);
1423 }
1424 }
1425 #endif // _LP64
1426 }
1427
1428 void Arguments::set_conservative_max_heap_alignment() {
1429 // The conservative maximum required alignment for the heap is the maximum of
1430 // the alignments imposed by several sources: any requirements from the heap
1431 // itself and the maximum page size we may run the VM with.
1432 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1433 _conservative_max_heap_alignment = MAX4(heap_alignment,
1434 os::vm_allocation_granularity(),
1435 os::max_page_size(),
1436 GCArguments::compute_heap_alignment());
1437 }
1438
1439 jint Arguments::set_ergonomics_flags() {
1440 GCConfig::initialize();
1441
1442 set_conservative_max_heap_alignment();
1443
1444 #ifdef _LP64
1445 set_use_compressed_oops();
1446
1447 // Also checks that certain machines are slower with compressed oops
1448 // in vm_version initialization code.
1449 #endif // _LP64
1450
1451 return JNI_OK;
1452 }
1453
1454 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1455 size_t max_allocatable;
1456 size_t result = limit;
1457 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1458 // The AggressiveHeap check is a temporary workaround to avoid calling
1459 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1460 // selected. This works because AggressiveHeap implies UseParallelGC
1461 // where we know the ratio will be 1. Once the AggressiveHeap option is
1462 // removed, this can be cleaned up.
1463 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1464 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1465 result = MIN2(result, max_allocatable / fraction);
1466 }
1467 return result;
1468 }
1469
1470 // Use static initialization to get the default before parsing
1471 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1472
1473 void Arguments::set_heap_size() {
1474 julong phys_mem;
1475
1476 // If the user specified one of these options, they
1477 // want specific memory sizing so do not limit memory
1478 // based on compressed oops addressability.
1479 // Also, memory limits will be calculated based on
1480 // available os physical memory, not our MaxRAM limit,
1481 // unless MaxRAM is also specified.
1482 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1483 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1484 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1485 !FLAG_IS_DEFAULT(MaxRAM));
1486 if (override_coop_limit) {
1487 if (FLAG_IS_DEFAULT(MaxRAM)) {
1488 phys_mem = os::physical_memory();
1489 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1490 } else {
1491 phys_mem = (julong)MaxRAM;
1492 }
1493 } else {
1494 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1495 : (julong)MaxRAM;
1496 }
1497
1498 // If the maximum heap size has not been set with -Xmx,
1499 // then set it as fraction of the size of physical memory,
1500 // respecting the maximum and minimum sizes of the heap.
1501 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1502 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1503 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1504 if (reasonable_min < MaxHeapSize) {
1505 // Small physical memory, so use a minimum fraction of it for the heap
1506 reasonable_max = reasonable_min;
1507 } else {
1508 // Not-small physical memory, so require a heap at least
1509 // as large as MaxHeapSize
1510 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1511 }
1512
1513 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1514 // Limit the heap size to ErgoHeapSizeLimit
1515 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1516 }
1517
1518 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1519
1520 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1521 // An initial heap size was specified on the command line,
1522 // so be sure that the maximum size is consistent. Done
1523 // after call to limit_heap_by_allocatable_memory because that
1524 // method might reduce the allocation size.
1525 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1526 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1527 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1528 }
1529
1530 #ifdef _LP64
1531 if (UseCompressedOops || UseCompressedClassPointers) {
1532 // HeapBaseMinAddress can be greater than default but not less than.
1533 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1534 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1535 // matches compressed oops printing flags
1536 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1537 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1538 DefaultHeapBaseMinAddress,
1539 DefaultHeapBaseMinAddress/G,
1540 HeapBaseMinAddress);
1541 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1542 }
1543 }
1544 }
1545 if (UseCompressedOops) {
1546 // Limit the heap size to the maximum possible when using compressed oops
1547 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1548
1549 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1550 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1551 // but it should be not less than default MaxHeapSize.
1552 max_coop_heap -= HeapBaseMinAddress;
1553 }
1554
1555 // If user specified flags prioritizing os physical
1556 // memory limits, then disable compressed oops if
1557 // limits exceed max_coop_heap and UseCompressedOops
1558 // was not specified.
1559 if (reasonable_max > max_coop_heap) {
1560 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1561 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1562 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1563 "Please check the setting of MaxRAMPercentage %5.2f."
1564 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1565 FLAG_SET_ERGO(UseCompressedOops, false);
1566 } else {
1567 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1568 }
1569 }
1570 }
1571 #endif // _LP64
1572
1573 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1574 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1575 }
1576
1577 // If the minimum or initial heap_size have not been set or requested to be set
1578 // ergonomically, set them accordingly.
1579 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1580 julong reasonable_minimum = (julong)(OldSize + NewSize);
1581
1582 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1583
1584 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1585
1586 if (InitialHeapSize == 0) {
1587 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1588 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1589
1590 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1591 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1592
1593 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1594 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1595 }
1596 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1597 // synchronize with InitialHeapSize to avoid errors with the default value.
1598 if (MinHeapSize == 0) {
1599 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1600 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1601 }
1602 }
1603 }
1604
1605 // This option inspects the machine and attempts to set various
1606 // parameters to be optimal for long-running, memory allocation
1607 // intensive jobs. It is intended for machines with large
1608 // amounts of cpu and memory.
1609 jint Arguments::set_aggressive_heap_flags() {
1610 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1611 // VM, but we may not be able to represent the total physical memory
1612 // available (like having 8gb of memory on a box but using a 32bit VM).
1613 // Thus, we need to make sure we're using a julong for intermediate
1614 // calculations.
1615 julong initHeapSize;
1616 julong total_memory = os::physical_memory();
1617
1618 if (total_memory < (julong) 256 * M) {
1619 jio_fprintf(defaultStream::error_stream(),
1620 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1621 vm_exit(1);
1622 }
1623
1624 // The heap size is half of available memory, or (at most)
1625 // all of possible memory less 160mb (leaving room for the OS
1626 // when using ISM). This is the maximum; because adaptive sizing
1627 // is turned on below, the actual space used may be smaller.
1628
1629 initHeapSize = MIN2(total_memory / (julong) 2,
1630 total_memory - (julong) 160 * M);
1631
1632 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1633
1634 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1635 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1636 return JNI_EINVAL;
1637 }
1638 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1639 return JNI_EINVAL;
1640 }
1641 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1642 return JNI_EINVAL;
1643 }
1644 }
1645 if (FLAG_IS_DEFAULT(NewSize)) {
1646 // Make the young generation 3/8ths of the total heap.
1647 if (FLAG_SET_CMDLINE(NewSize,
1648 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1649 return JNI_EINVAL;
1650 }
1651 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1652 return JNI_EINVAL;
1653 }
1654 }
1655
1656 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1657 FLAG_SET_DEFAULT(UseLargePages, true);
1658 #endif
1659
1660 // Increase some data structure sizes for efficiency
1661 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1662 return JNI_EINVAL;
1663 }
1664 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1665 return JNI_EINVAL;
1666 }
1667
1668 // See the OldPLABSize comment below, but replace 'after promotion'
1669 // with 'after copying'. YoungPLABSize is the size of the survivor
1670 // space per-gc-thread buffers. The default is 4kw.
1671 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1672 return JNI_EINVAL;
1673 }
1674
1675 // OldPLABSize is the size of the buffers in the old gen that
1676 // UseParallelGC uses to promote live data that doesn't fit in the
1677 // survivor spaces. At any given time, there's one for each gc thread.
1678 // The default size is 1kw. These buffers are rarely used, since the
1679 // survivor spaces are usually big enough. For specjbb, however, there
1680 // are occasions when there's lots of live data in the young gen
1681 // and we end up promoting some of it. We don't have a definite
1682 // explanation for why bumping OldPLABSize helps, but the theory
1683 // is that a bigger PLAB results in retaining something like the
1684 // original allocation order after promotion, which improves mutator
1685 // locality. A minor effect may be that larger PLABs reduce the
1686 // number of PLAB allocation events during gc. The value of 8kw
1687 // was arrived at by experimenting with specjbb.
1688 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1689 return JNI_EINVAL;
1690 }
1691
1692 // Enable parallel GC and adaptive generation sizing
1693 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1694 return JNI_EINVAL;
1695 }
1696
1697 // Encourage steady state memory management
1698 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1699 return JNI_EINVAL;
1700 }
1701
1702 return JNI_OK;
1703 }
1704
1705 // This must be called after ergonomics.
1706 void Arguments::set_bytecode_flags() {
1707 if (!RewriteBytecodes) {
1708 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1709 }
1710 }
1711
1712 // Aggressive optimization flags
1713 jint Arguments::set_aggressive_opts_flags() {
1714 #ifdef COMPILER2
1715 if (AggressiveUnboxing) {
1716 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1717 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1718 } else if (!EliminateAutoBox) {
1719 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1720 AggressiveUnboxing = false;
1721 }
1722 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1723 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1724 } else if (!DoEscapeAnalysis) {
1725 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1726 AggressiveUnboxing = false;
1727 }
1728 }
1729 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1730 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1731 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1732 }
1733 // Feed the cache size setting into the JDK
1734 char buffer[1024];
1735 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1736 if (!add_property(buffer)) {
1737 return JNI_ENOMEM;
1738 }
1739 }
1740 #endif
1741
1742 return JNI_OK;
1743 }
1744
1745 //===========================================================================================================
1746
1747 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1748 if (_sun_java_launcher != _default_java_launcher) {
1749 os::free(const_cast<char*>(_sun_java_launcher));
1750 }
1751 _sun_java_launcher = os::strdup_check_oom(launcher);
1752 }
1753
1754 bool Arguments::created_by_java_launcher() {
1755 assert(_sun_java_launcher != nullptr, "property must have value");
1756 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1757 }
1758
1759 bool Arguments::sun_java_launcher_is_altjvm() {
1760 return _sun_java_launcher_is_altjvm;
1761 }
1762
1763 //===========================================================================================================
1764 // Parsing of main arguments
1765
1766 static unsigned int addreads_count = 0;
1767 static unsigned int addexports_count = 0;
1768 static unsigned int addopens_count = 0;
1769 static unsigned int patch_mod_count = 0;
1770 static unsigned int enable_native_access_count = 0;
1771 static bool patch_mod_javabase = false;
1772
1773 // Check the consistency of vm_init_args
1774 bool Arguments::check_vm_args_consistency() {
1775 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1776 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) {
1777 return false;
1778 }
1779
1780 // Method for adding checks for flag consistency.
1781 // The intent is to warn the user of all possible conflicts,
1782 // before returning an error.
1783 // Note: Needs platform-dependent factoring.
1784 bool status = true;
1785
1786 if (TLABRefillWasteFraction == 0) {
1787 jio_fprintf(defaultStream::error_stream(),
1788 "TLABRefillWasteFraction should be a denominator, "
1789 "not " SIZE_FORMAT "\n",
1790 TLABRefillWasteFraction);
1791 status = false;
1792 }
1793
1794 status = CompilerConfig::check_args_consistency(status);
1795 #if INCLUDE_JVMCI
1796 if (status && EnableJVMCI) {
1797 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1798 AddProperty, UnwriteableProperty, InternalProperty);
1799 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1800 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1801 return false;
1802 }
1803 }
1804 }
1805 #endif
1806
1807 #if INCLUDE_JFR
1808 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1809 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1810 return false;
1811 }
1812 }
1813 #endif
1814
1815 #ifndef SUPPORT_RESERVED_STACK_AREA
1816 if (StackReservedPages != 0) {
1817 FLAG_SET_CMDLINE(StackReservedPages, 0);
1818 warning("Reserved Stack Area not supported on this platform");
1819 }
1820 #endif
1821
1822 #ifndef _LP64
1823 if (LockingMode == LM_LEGACY) {
1824 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1825 // Self-forwarding in bit 3 of the mark-word conflicts
1826 // with 4-byte-aligned stack-locks.
1827 warning("Legacy locking not supported on this platform");
1828 }
1829 #endif
1830
1831 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1832 // ObjectMonitorTable requires lightweight locking.
1833 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1834 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1835 }
1836
1837 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1838 if (LockingMode == LM_MONITOR) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1841 return false;
1842 }
1843 #endif
1844 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1845 jio_fprintf(defaultStream::error_stream(),
1846 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1847 return false;
1848 }
1849 return status;
1850 }
1851
1852 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1853 const char* option_type) {
1854 if (ignore) return false;
1855
1856 const char* spacer = " ";
1857 if (option_type == nullptr) {
1858 option_type = ++spacer; // Set both to the empty string.
1859 }
1860
1861 jio_fprintf(defaultStream::error_stream(),
1862 "Unrecognized %s%soption: %s\n", option_type, spacer,
1863 option->optionString);
1864 return true;
1865 }
1866
1867 static const char* user_assertion_options[] = {
1868 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1869 };
1870
1871 static const char* system_assertion_options[] = {
1872 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1873 };
1874
1875 bool Arguments::parse_uint(const char* value,
1876 uint* uint_arg,
1877 uint min_size) {
1878 uint n;
1879 if (!parse_integer(value, &n)) {
1880 return false;
1881 }
1882 if (n >= min_size) {
1883 *uint_arg = n;
1884 return true;
1885 } else {
1886 return false;
1887 }
1888 }
1889
1890 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1891 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1892 CDSConfig::check_internal_module_property(prop_name, prop_value);
1893 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1894 char* property = AllocateHeap(prop_len, mtArguments);
1895 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1896 if (ret < 0 || ret >= (int)prop_len) {
1897 FreeHeap(property);
1898 return false;
1899 }
1900 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1901 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1902 // that multiple occurrences of the associated flag just causes the existing property value to be
1903 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1904 // to a property after we have finished flag processing.
1905 bool added = add_property(property, WriteableProperty, internal);
1906 FreeHeap(property);
1907 return added;
1908 }
1909
1910 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1911 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1912 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1913 const unsigned int props_count_limit = 1000;
1914 const int max_digits = 3;
1915 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1916
1917 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1918 if (count < props_count_limit) {
1919 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1920 char* property = AllocateHeap(prop_len, mtArguments);
1921 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1922 if (ret < 0 || ret >= (int)prop_len) {
1923 FreeHeap(property);
1924 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1925 return false;
1926 }
1927 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1928 FreeHeap(property);
1929 return added;
1930 }
1931
1932 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1933 return false;
1934 }
1935
1936 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1937 julong* long_arg,
1938 julong min_size,
1939 julong max_size) {
1940 if (!parse_integer(s, long_arg)) return arg_unreadable;
1941 return check_memory_size(*long_arg, min_size, max_size);
1942 }
1943
1944 // Parse JavaVMInitArgs structure
1945
1946 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1947 const JavaVMInitArgs *java_tool_options_args,
1948 const JavaVMInitArgs *java_options_args,
1949 const JavaVMInitArgs *cmd_line_args) {
1950 // Save default settings for some mode flags
1951 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1952 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1953 Arguments::_ClipInlining = ClipInlining;
1954 Arguments::_BackgroundCompilation = BackgroundCompilation;
1955
1956 // Remember the default value of SharedBaseAddress.
1957 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1958
1959 // Setup flags for mixed which is the default
1960 set_mode_flags(_mixed);
1961
1962 // Parse args structure generated from java.base vm options resource
1963 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1964 if (result != JNI_OK) {
1965 return result;
1966 }
1967
1968 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1969 // variable (if present).
1970 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974
1975 // Parse args structure generated from the command line flags.
1976 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1977 if (result != JNI_OK) {
1978 return result;
1979 }
1980
1981 // Parse args structure generated from the _JAVA_OPTIONS environment
1982 // variable (if present) (mimics classic VM)
1983 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1984 if (result != JNI_OK) {
1985 return result;
1986 }
1987
1988 // Disable CDS for exploded image
1989 if (!has_jimage()) {
1990 no_shared_spaces("CDS disabled on exploded JDK");
1991 }
1992
1993 // We need to ensure processor and memory resources have been properly
1994 // configured - which may rely on arguments we just processed - before
1995 // doing the final argument processing. Any argument processing that
1996 // needs to know about processor and memory resources must occur after
1997 // this point.
1998
1999 os::init_container_support();
2000
2001 SystemMemoryBarrier::initialize();
2002
2003 // Do final processing now that all arguments have been parsed
2004 result = finalize_vm_init_args();
2005 if (result != JNI_OK) {
2006 return result;
2007 }
2008
2009 return JNI_OK;
2010 }
2011
2012 #if !INCLUDE_JVMTI
2013 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2014 // represents a valid JDWP agent. is_path==true denotes that we
2015 // are dealing with -agentpath (case where name is a path), otherwise with
2016 // -agentlib
2017 static bool valid_jdwp_agent(char *name, bool is_path) {
2018 char *_name;
2019 const char *_jdwp = "jdwp";
2020 size_t _len_jdwp, _len_prefix;
2021
2022 if (is_path) {
2023 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2024 return false;
2025 }
2026
2027 _name++; // skip past last path separator
2028 _len_prefix = strlen(JNI_LIB_PREFIX);
2029
2030 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2031 return false;
2032 }
2033
2034 _name += _len_prefix;
2035 _len_jdwp = strlen(_jdwp);
2036
2037 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2038 _name += _len_jdwp;
2039 }
2040 else {
2041 return false;
2042 }
2043
2044 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2045 return false;
2046 }
2047
2048 return true;
2049 }
2050
2051 if (strcmp(name, _jdwp) == 0) {
2052 return true;
2053 }
2054
2055 return false;
2056 }
2057 #endif
2058
2059 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2060 // --patch-module=<module>=<file>(<pathsep><file>)*
2061 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2062 // Find the equal sign between the module name and the path specification
2063 const char* module_equal = strchr(patch_mod_tail, '=');
2064 if (module_equal == nullptr) {
2065 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2066 return JNI_ERR;
2067 } else {
2068 // Pick out the module name
2069 size_t module_len = module_equal - patch_mod_tail;
2070 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2071 if (module_name != nullptr) {
2072 memcpy(module_name, patch_mod_tail, module_len);
2073 *(module_name + module_len) = '\0';
2074 // The path piece begins one past the module_equal sign
2075 add_patch_mod_prefix(module_name, module_equal + 1);
2076 FREE_C_HEAP_ARRAY(char, module_name);
2077 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2078 return JNI_ENOMEM;
2079 }
2080 } else {
2081 return JNI_ENOMEM;
2082 }
2083 }
2084 return JNI_OK;
2085 }
2086
2087 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2088 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2089 // The min and max sizes match the values in globals.hpp, but scaled
2090 // with K. The values have been chosen so that alignment with page
2091 // size doesn't change the max value, which makes the conversions
2092 // back and forth between Xss value and ThreadStackSize value easier.
2093 // The values have also been chosen to fit inside a 32-bit signed type.
2094 const julong min_ThreadStackSize = 0;
2095 const julong max_ThreadStackSize = 1 * M;
2096
2097 // Make sure the above values match the range set in globals.hpp
2098 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2099 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2100 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2101
2102 const julong min_size = min_ThreadStackSize * K;
2103 const julong max_size = max_ThreadStackSize * K;
2104
2105 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2106
2107 julong size = 0;
2108 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2109 if (errcode != arg_in_range) {
2110 bool silent = (option == nullptr); // Allow testing to silence error messages
2111 if (!silent) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "Invalid thread stack size: %s\n", option->optionString);
2114 describe_range_error(errcode);
2115 }
2116 return JNI_EINVAL;
2117 }
2118
2119 // Internally track ThreadStackSize in units of 1024 bytes.
2120 const julong size_aligned = align_up(size, K);
2121 assert(size <= size_aligned,
2122 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2123 size, size_aligned);
2124
2125 const julong size_in_K = size_aligned / K;
2126 assert(size_in_K < (julong)max_intx,
2127 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2128 size_in_K);
2129
2130 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2131 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2132 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2133 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2134 max_expanded, size_in_K);
2135
2136 *out_ThreadStackSize = (intx)size_in_K;
2137
2138 return JNI_OK;
2139 }
2140
2141 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2142 // For match_option to return remaining or value part of option string
2143 const char* tail;
2144
2145 // iterate over arguments
2146 for (int index = 0; index < args->nOptions; index++) {
2147 bool is_absolute_path = false; // for -agentpath vs -agentlib
2148
2149 const JavaVMOption* option = args->options + index;
2150
2151 if (!match_option(option, "-Djava.class.path", &tail) &&
2152 !match_option(option, "-Dsun.java.command", &tail) &&
2153 !match_option(option, "-Dsun.java.launcher", &tail)) {
2154
2155 // add all jvm options to the jvm_args string. This string
2156 // is used later to set the java.vm.args PerfData string constant.
2157 // the -Djava.class.path and the -Dsun.java.command options are
2158 // omitted from jvm_args string as each have their own PerfData
2159 // string constant object.
2160 build_jvm_args(option->optionString);
2161 }
2162
2163 // -verbose:[class/module/gc/jni]
2164 if (match_option(option, "-verbose", &tail)) {
2165 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2166 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2167 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2168 } else if (!strcmp(tail, ":module")) {
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2170 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2171 } else if (!strcmp(tail, ":gc")) {
2172 if (_legacyGCLogging.lastFlag == 0) {
2173 _legacyGCLogging.lastFlag = 1;
2174 }
2175 } else if (!strcmp(tail, ":jni")) {
2176 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2177 }
2178 // -da / -ea / -disableassertions / -enableassertions
2179 // These accept an optional class/package name separated by a colon, e.g.,
2180 // -da:java.lang.Thread.
2181 } else if (match_option(option, user_assertion_options, &tail, true)) {
2182 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2183 if (*tail == '\0') {
2184 JavaAssertions::setUserClassDefault(enable);
2185 } else {
2186 assert(*tail == ':', "bogus match by match_option()");
2187 JavaAssertions::addOption(tail + 1, enable);
2188 }
2189 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2190 } else if (match_option(option, system_assertion_options, &tail, false)) {
2191 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2192 JavaAssertions::setSystemClassDefault(enable);
2193 // -bootclasspath:
2194 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2195 jio_fprintf(defaultStream::output_stream(),
2196 "-Xbootclasspath is no longer a supported option.\n");
2197 return JNI_EINVAL;
2198 // -bootclasspath/a:
2199 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2200 Arguments::append_sysclasspath(tail);
2201 // -bootclasspath/p:
2202 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2203 jio_fprintf(defaultStream::output_stream(),
2204 "-Xbootclasspath/p is no longer a supported option.\n");
2205 return JNI_EINVAL;
2206 // -Xrun
2207 } else if (match_option(option, "-Xrun", &tail)) {
2208 if (tail != nullptr) {
2209 const char* pos = strchr(tail, ':');
2210 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2211 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2212 jio_snprintf(name, len + 1, "%s", tail);
2213
2214 char *options = nullptr;
2215 if(pos != nullptr) {
2216 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2217 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2218 }
2219 #if !INCLUDE_JVMTI
2220 if (strcmp(name, "jdwp") == 0) {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "Debugging agents are not supported in this VM\n");
2223 return JNI_ERR;
2224 }
2225 #endif // !INCLUDE_JVMTI
2226 JvmtiAgentList::add_xrun(name, options, false);
2227 FREE_C_HEAP_ARRAY(char, name);
2228 FREE_C_HEAP_ARRAY(char, options);
2229 }
2230 } else if (match_option(option, "--add-reads=", &tail)) {
2231 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2232 return JNI_ENOMEM;
2233 }
2234 } else if (match_option(option, "--add-exports=", &tail)) {
2235 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2236 return JNI_ENOMEM;
2237 }
2238 } else if (match_option(option, "--add-opens=", &tail)) {
2239 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2240 return JNI_ENOMEM;
2241 }
2242 } else if (match_option(option, "--add-modules=", &tail)) {
2243 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2244 return JNI_ENOMEM;
2245 }
2246 } else if (match_option(option, "--enable-native-access=", &tail)) {
2247 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2248 return JNI_ENOMEM;
2249 }
2250 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2251 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2252 return JNI_ENOMEM;
2253 }
2254 } else if (match_option(option, "--limit-modules=", &tail)) {
2255 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2256 return JNI_ENOMEM;
2257 }
2258 } else if (match_option(option, "--module-path=", &tail)) {
2259 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2260 return JNI_ENOMEM;
2261 }
2262 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2263 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--patch-module=", &tail)) {
2267 // --patch-module=<module>=<file>(<pathsep><file>)*
2268 int res = process_patch_mod_option(tail);
2269 if (res != JNI_OK) {
2270 return res;
2271 }
2272 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2273 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2274 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2275 AddProperty, WriteableProperty, InternalProperty);
2276 } else {
2277 jio_fprintf(defaultStream::error_stream(),
2278 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2279 return JNI_ERR;
2280 }
2281 } else if (match_option(option, "--illegal-access=", &tail)) {
2282 char version[256];
2283 JDK_Version::jdk(17).to_string(version, sizeof(version));
2284 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2285 // -agentlib and -agentpath
2286 } else if (match_option(option, "-agentlib:", &tail) ||
2287 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2288 if(tail != nullptr) {
2289 const char* pos = strchr(tail, '=');
2290 char* name;
2291 if (pos == nullptr) {
2292 name = os::strdup_check_oom(tail, mtArguments);
2293 } else {
2294 size_t len = pos - tail;
2295 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2296 memcpy(name, tail, len);
2297 name[len] = '\0';
2298 }
2299
2300 char *options = nullptr;
2301 if(pos != nullptr) {
2302 options = os::strdup_check_oom(pos + 1, mtArguments);
2303 }
2304 #if !INCLUDE_JVMTI
2305 if (valid_jdwp_agent(name, is_absolute_path)) {
2306 jio_fprintf(defaultStream::error_stream(),
2307 "Debugging agents are not supported in this VM\n");
2308 return JNI_ERR;
2309 }
2310 #endif // !INCLUDE_JVMTI
2311 JvmtiAgentList::add(name, options, is_absolute_path);
2312 os::free(name);
2313 os::free(options);
2314 }
2315 // -javaagent
2316 } else if (match_option(option, "-javaagent:", &tail)) {
2317 #if !INCLUDE_JVMTI
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Instrumentation agents are not supported in this VM\n");
2320 return JNI_ERR;
2321 #else
2322 if (tail != nullptr) {
2323 size_t length = strlen(tail) + 1;
2324 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2325 jio_snprintf(options, length, "%s", tail);
2326 JvmtiAgentList::add("instrument", options, false);
2327 FREE_C_HEAP_ARRAY(char, options);
2328
2329 // java agents need module java.instrument
2330 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2331 return JNI_ENOMEM;
2332 }
2333 }
2334 #endif // !INCLUDE_JVMTI
2335 // --enable_preview
2336 } else if (match_option(option, "--enable-preview")) {
2337 set_enable_preview();
2338 // -Xnoclassgc
2339 } else if (match_option(option, "-Xnoclassgc")) {
2340 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2341 return JNI_EINVAL;
2342 }
2343 // -Xbatch
2344 } else if (match_option(option, "-Xbatch")) {
2345 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348 // -Xmn for compatibility with other JVM vendors
2349 } else if (match_option(option, "-Xmn", &tail)) {
2350 julong long_initial_young_size = 0;
2351 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2352 if (errcode != arg_in_range) {
2353 jio_fprintf(defaultStream::error_stream(),
2354 "Invalid initial young generation size: %s\n", option->optionString);
2355 describe_range_error(errcode);
2356 return JNI_EINVAL;
2357 }
2358 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2359 return JNI_EINVAL;
2360 }
2361 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 // -Xms
2365 } else if (match_option(option, "-Xms", &tail)) {
2366 julong size = 0;
2367 // an initial heap size of 0 means automatically determine
2368 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2369 if (errcode != arg_in_range) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Invalid initial heap size: %s\n", option->optionString);
2372 describe_range_error(errcode);
2373 return JNI_EINVAL;
2374 }
2375 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2379 return JNI_EINVAL;
2380 }
2381 // -Xmx
2382 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2383 julong long_max_heap_size = 0;
2384 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2385 if (errcode != arg_in_range) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "Invalid maximum heap size: %s\n", option->optionString);
2388 describe_range_error(errcode);
2389 return JNI_EINVAL;
2390 }
2391 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2392 return JNI_EINVAL;
2393 }
2394 // Xmaxf
2395 } else if (match_option(option, "-Xmaxf", &tail)) {
2396 char* err;
2397 int maxf = (int)(strtod(tail, &err) * 100);
2398 if (*err != '\0' || *tail == '\0') {
2399 jio_fprintf(defaultStream::error_stream(),
2400 "Bad max heap free percentage size: %s\n",
2401 option->optionString);
2402 return JNI_EINVAL;
2403 } else {
2404 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2405 return JNI_EINVAL;
2406 }
2407 }
2408 // Xminf
2409 } else if (match_option(option, "-Xminf", &tail)) {
2410 char* err;
2411 int minf = (int)(strtod(tail, &err) * 100);
2412 if (*err != '\0' || *tail == '\0') {
2413 jio_fprintf(defaultStream::error_stream(),
2414 "Bad min heap free percentage size: %s\n",
2415 option->optionString);
2416 return JNI_EINVAL;
2417 } else {
2418 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2419 return JNI_EINVAL;
2420 }
2421 }
2422 // -Xss
2423 } else if (match_option(option, "-Xss", &tail)) {
2424 intx value = 0;
2425 jint err = parse_xss(option, tail, &value);
2426 if (err != JNI_OK) {
2427 return err;
2428 }
2429 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2433 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2434 julong long_ReservedCodeCacheSize = 0;
2435
2436 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2437 if (errcode != arg_in_range) {
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Invalid maximum code cache size: %s.\n", option->optionString);
2440 return JNI_EINVAL;
2441 }
2442 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 // -green
2446 } else if (match_option(option, "-green")) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "Green threads support not available\n");
2449 return JNI_EINVAL;
2450 // -native
2451 } else if (match_option(option, "-native")) {
2452 // HotSpot always uses native threads, ignore silently for compatibility
2453 // -Xrs
2454 } else if (match_option(option, "-Xrs")) {
2455 // Classic/EVM option, new functionality
2456 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2457 return JNI_EINVAL;
2458 }
2459 // -Xprof
2460 } else if (match_option(option, "-Xprof")) {
2461 char version[256];
2462 // Obsolete in JDK 10
2463 JDK_Version::jdk(10).to_string(version, sizeof(version));
2464 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2465 // -Xinternalversion
2466 } else if (match_option(option, "-Xinternalversion")) {
2467 jio_fprintf(defaultStream::output_stream(), "%s\n",
2468 VM_Version::internal_vm_info_string());
2469 vm_exit(0);
2470 #ifndef PRODUCT
2471 // -Xprintflags
2472 } else if (match_option(option, "-Xprintflags")) {
2473 JVMFlag::printFlags(tty, false);
2474 vm_exit(0);
2475 #endif
2476 // -D
2477 } else if (match_option(option, "-D", &tail)) {
2478 const char* value;
2479 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2480 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2481 // abort if -Djava.endorsed.dirs is set
2482 jio_fprintf(defaultStream::output_stream(),
2483 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2484 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2485 return JNI_EINVAL;
2486 }
2487 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2488 *value != '\0' && strcmp(value, "\"\"") != 0) {
2489 // abort if -Djava.ext.dirs is set
2490 jio_fprintf(defaultStream::output_stream(),
2491 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2492 return JNI_EINVAL;
2493 }
2494 // Check for module related properties. They must be set using the modules
2495 // options. For example: use "--add-modules=java.sql", not
2496 // "-Djdk.module.addmods=java.sql"
2497 if (is_internal_module_property(option->optionString + 2)) {
2498 needs_module_property_warning = true;
2499 continue;
2500 }
2501 if (!add_property(tail)) {
2502 return JNI_ENOMEM;
2503 }
2504 // Out of the box management support
2505 if (match_option(option, "-Dcom.sun.management", &tail)) {
2506 #if INCLUDE_MANAGEMENT
2507 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2508 return JNI_EINVAL;
2509 }
2510 // management agent in module jdk.management.agent
2511 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2512 return JNI_ENOMEM;
2513 }
2514 #else
2515 jio_fprintf(defaultStream::output_stream(),
2516 "-Dcom.sun.management is not supported in this VM.\n");
2517 return JNI_ERR;
2518 #endif
2519 }
2520 // -Xint
2521 } else if (match_option(option, "-Xint")) {
2522 set_mode_flags(_int);
2523 mode_flag_cmd_line = true;
2524 // -Xmixed
2525 } else if (match_option(option, "-Xmixed")) {
2526 set_mode_flags(_mixed);
2527 mode_flag_cmd_line = true;
2528 // -Xcomp
2529 } else if (match_option(option, "-Xcomp")) {
2530 // for testing the compiler; turn off all flags that inhibit compilation
2531 set_mode_flags(_comp);
2532 mode_flag_cmd_line = true;
2533 // -Xshare:dump
2534 } else if (match_option(option, "-Xshare:dump")) {
2535 CDSConfig::enable_dumping_static_archive();
2536 CDSConfig::set_old_cds_flags_used();
2537 // -Xshare:on
2538 } else if (match_option(option, "-Xshare:on")) {
2539 UseSharedSpaces = true;
2540 RequireSharedSpaces = true;
2541 CDSConfig::set_old_cds_flags_used();
2542 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2543 } else if (match_option(option, "-Xshare:auto")) {
2544 UseSharedSpaces = true;
2545 RequireSharedSpaces = false;
2546 xshare_auto_cmd_line = true;
2547 CDSConfig::set_old_cds_flags_used();
2548 // -Xshare:off
2549 } else if (match_option(option, "-Xshare:off")) {
2550 UseSharedSpaces = false;
2551 RequireSharedSpaces = false;
2552 CDSConfig::set_old_cds_flags_used();
2553 // -Xverify
2554 } else if (match_option(option, "-Xverify", &tail)) {
2555 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2556 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2557 return JNI_EINVAL;
2558 }
2559 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2560 return JNI_EINVAL;
2561 }
2562 } else if (strcmp(tail, ":remote") == 0) {
2563 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2564 return JNI_EINVAL;
2565 }
2566 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2567 return JNI_EINVAL;
2568 }
2569 } else if (strcmp(tail, ":none") == 0) {
2570 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2574 return JNI_EINVAL;
2575 }
2576 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2577 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2578 return JNI_EINVAL;
2579 }
2580 // -Xdebug
2581 } else if (match_option(option, "-Xdebug")) {
2582 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2583 } else if (match_option(option, "-Xloggc:", &tail)) {
2584 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2585 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2586 _legacyGCLogging.lastFlag = 2;
2587 _legacyGCLogging.file = os::strdup_check_oom(tail);
2588 } else if (match_option(option, "-Xlog", &tail)) {
2589 bool ret = false;
2590 if (strcmp(tail, ":help") == 0) {
2591 fileStream stream(defaultStream::output_stream());
2592 LogConfiguration::print_command_line_help(&stream);
2593 vm_exit(0);
2594 } else if (strcmp(tail, ":disable") == 0) {
2595 LogConfiguration::disable_logging();
2596 ret = true;
2597 } else if (strcmp(tail, ":async") == 0) {
2598 LogConfiguration::set_async_mode(true);
2599 ret = true;
2600 } else if (*tail == '\0') {
2601 ret = LogConfiguration::parse_command_line_arguments();
2602 assert(ret, "-Xlog without arguments should never fail to parse");
2603 } else if (*tail == ':') {
2604 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2605 }
2606 if (ret == false) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2609 tail);
2610 return JNI_EINVAL;
2611 }
2612 // JNI hooks
2613 } else if (match_option(option, "-Xcheck", &tail)) {
2614 if (!strcmp(tail, ":jni")) {
2615 #if !INCLUDE_JNI_CHECK
2616 warning("JNI CHECKING is not supported in this VM");
2617 #else
2618 CheckJNICalls = true;
2619 #endif // INCLUDE_JNI_CHECK
2620 } else if (is_bad_option(option, args->ignoreUnrecognized,
2621 "check")) {
2622 return JNI_EINVAL;
2623 }
2624 } else if (match_option(option, "vfprintf")) {
2625 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2626 } else if (match_option(option, "exit")) {
2627 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2628 } else if (match_option(option, "abort")) {
2629 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2630 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2631 // and the last option wins.
2632 } else if (match_option(option, "-XX:+NeverTenure")) {
2633 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2634 return JNI_EINVAL;
2635 }
2636 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2643 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2653 uint max_tenuring_thresh = 0;
2654 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2655 jio_fprintf(defaultStream::error_stream(),
2656 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2657 return JNI_EINVAL;
2658 }
2659
2660 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663
2664 if (MaxTenuringThreshold == 0) {
2665 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 } else {
2672 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 }
2679 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2680 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2687 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2688 return JNI_EINVAL;
2689 }
2690 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2694 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2701 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 } else if (match_option(option, "--finalization=", &tail)) {
2708 if (strcmp(tail, "enabled") == 0) {
2709 InstanceKlass::set_finalization_enabled(true);
2710 } else if (strcmp(tail, "disabled") == 0) {
2711 InstanceKlass::set_finalization_enabled(false);
2712 } else {
2713 jio_fprintf(defaultStream::error_stream(),
2714 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2715 tail);
2716 return JNI_EINVAL;
2717 }
2718 #if !defined(DTRACE_ENABLED)
2719 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "DTraceMethodProbes flag is not applicable for this configuration\n");
2722 return JNI_EINVAL;
2723 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2724 jio_fprintf(defaultStream::error_stream(),
2725 "DTraceAllocProbes flag is not applicable for this configuration\n");
2726 return JNI_EINVAL;
2727 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2728 jio_fprintf(defaultStream::error_stream(),
2729 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2730 return JNI_EINVAL;
2731 #endif // !defined(DTRACE_ENABLED)
2732 #ifdef ASSERT
2733 } else if (match_option(option, "-XX:+FullGCALot")) {
2734 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 #endif
2738 #if !INCLUDE_MANAGEMENT
2739 } else if (match_option(option, "-XX:+ManagementServer")) {
2740 jio_fprintf(defaultStream::error_stream(),
2741 "ManagementServer is not supported in this VM.\n");
2742 return JNI_ERR;
2743 #endif // INCLUDE_MANAGEMENT
2744 #if INCLUDE_JVMCI
2745 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2746 if (EnableJVMCIProduct) {
2747 jio_fprintf(defaultStream::error_stream(),
2748 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2749 return JNI_EINVAL;
2750 }
2751 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2752 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2753 if (use_graal_jit) {
2754 const char* jvmci_compiler = get_property("jvmci.Compiler");
2755 if (jvmci_compiler != nullptr) {
2756 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2759 return JNI_ERR;
2760 }
2761 } else if (!add_property("jvmci.Compiler=graal")) {
2762 return JNI_ENOMEM;
2763 }
2764 }
2765
2766 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2767 if (EnableJVMCIProduct) {
2768 continue;
2769 }
2770 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2771 // Allow this flag if it has been unlocked.
2772 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2773 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Unable to enable JVMCI in product mode\n");
2776 return JNI_ERR;
2777 }
2778 }
2779 // The flag was locked so process normally to report that error
2780 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2781 return JNI_EINVAL;
2782 }
2783 #endif // INCLUDE_JVMCI
2784 #if INCLUDE_JFR
2785 } else if (match_jfr_option(&option)) {
2786 return JNI_EINVAL;
2787 #endif
2788 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2789 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2790 // already been handled
2791 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2792 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2793 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2794 return JNI_EINVAL;
2795 }
2796 }
2797 // Unknown option
2798 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2799 return JNI_ERR;
2800 }
2801 }
2802
2803 // PrintSharedArchiveAndExit will turn on
2804 // -Xshare:on
2805 // -Xlog:class+path=info
2806 if (PrintSharedArchiveAndExit) {
2807 UseSharedSpaces = true;
2808 RequireSharedSpaces = true;
2809 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2810 }
2811
2812 fix_appclasspath();
2813
2814 return JNI_OK;
2815 }
2816
2817 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2818 // For java.base check for duplicate --patch-module options being specified on the command line.
2819 // This check is only required for java.base, all other duplicate module specifications
2820 // will be checked during module system initialization. The module system initialization
2821 // will throw an ExceptionInInitializerError if this situation occurs.
2822 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2823 if (patch_mod_javabase) {
2824 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2825 } else {
2826 patch_mod_javabase = true;
2827 }
2828 }
2829
2830 // Create GrowableArray lazily, only if --patch-module has been specified
2831 if (_patch_mod_prefix == nullptr) {
2832 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2833 }
2834
2835 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2836 }
2837
2838 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2839 //
2840 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2841 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2842 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2843 // path is treated as the current directory.
2844 //
2845 // This causes problems with CDS, which requires that all directories specified in the classpath
2846 // must be empty. In most cases, applications do NOT want to load classes from the current
2847 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2848 // scripts compatible with CDS.
2849 void Arguments::fix_appclasspath() {
2850 if (IgnoreEmptyClassPaths) {
2851 const char separator = *os::path_separator();
2852 const char* src = _java_class_path->value();
2853
2854 // skip over all the leading empty paths
2855 while (*src == separator) {
2856 src ++;
2857 }
2858
2859 char* copy = os::strdup_check_oom(src, mtArguments);
2860
2861 // trim all trailing empty paths
2862 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2863 *tail = '\0';
2864 }
2865
2866 char from[3] = {separator, separator, '\0'};
2867 char to [2] = {separator, '\0'};
2868 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2869 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2870 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2871 }
2872
2873 _java_class_path->set_writeable_value(copy);
2874 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2875 }
2876 }
2877
2878 jint Arguments::finalize_vm_init_args() {
2879 // check if the default lib/endorsed directory exists; if so, error
2880 char path[JVM_MAXPATHLEN];
2881 const char* fileSep = os::file_separator();
2882 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2883
2884 DIR* dir = os::opendir(path);
2885 if (dir != nullptr) {
2886 jio_fprintf(defaultStream::output_stream(),
2887 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2888 "in modular form will be supported via the concept of upgradeable modules.\n");
2889 os::closedir(dir);
2890 return JNI_ERR;
2891 }
2892
2893 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2894 dir = os::opendir(path);
2895 if (dir != nullptr) {
2896 jio_fprintf(defaultStream::output_stream(),
2897 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2898 "Use -classpath instead.\n.");
2899 os::closedir(dir);
2900 return JNI_ERR;
2901 }
2902
2903 // This must be done after all arguments have been processed
2904 // and the container support has been initialized since AggressiveHeap
2905 // relies on the amount of total memory available.
2906 if (AggressiveHeap) {
2907 jint result = set_aggressive_heap_flags();
2908 if (result != JNI_OK) {
2909 return result;
2910 }
2911 }
2912
2913 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2914 // but like -Xint, leave compilation thresholds unaffected.
2915 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2916 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2917 set_mode_flags(_int);
2918 }
2919
2920 #ifdef ZERO
2921 // Zero always runs in interpreted mode
2922 set_mode_flags(_int);
2923 #endif
2924
2925 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2926 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2927 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2928 }
2929
2930 #if !COMPILER2_OR_JVMCI
2931 // Don't degrade server performance for footprint
2932 if (FLAG_IS_DEFAULT(UseLargePages) &&
2933 MaxHeapSize < LargePageHeapSizeThreshold) {
2934 // No need for large granularity pages w/small heaps.
2935 // Note that large pages are enabled/disabled for both the
2936 // Java heap and the code cache.
2937 FLAG_SET_DEFAULT(UseLargePages, false);
2938 }
2939
2940 UNSUPPORTED_OPTION(ProfileInterpreter);
2941 #endif
2942
2943 // Parse the CompilationMode flag
2944 if (!CompilationModeFlag::initialize()) {
2945 return JNI_ERR;
2946 }
2947
2948 if (!check_vm_args_consistency()) {
2949 return JNI_ERR;
2950 }
2951
2952 if (StoreCachedCode) {
2953 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2954 }
2955
2956 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2957 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2958 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2959
2960 return JNI_OK;
2961 }
2962
2963 // Helper class for controlling the lifetime of JavaVMInitArgs
2964 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2965 // deleted on the destruction of the ScopedVMInitArgs object.
2966 class ScopedVMInitArgs : public StackObj {
2967 private:
2968 JavaVMInitArgs _args;
2969 char* _container_name;
2970 bool _is_set;
2971 char* _vm_options_file_arg;
2972
2973 public:
2974 ScopedVMInitArgs(const char *container_name) {
2975 _args.version = JNI_VERSION_1_2;
2976 _args.nOptions = 0;
2977 _args.options = nullptr;
2978 _args.ignoreUnrecognized = false;
2979 _container_name = (char *)container_name;
2980 _is_set = false;
2981 _vm_options_file_arg = nullptr;
2982 }
2983
2984 // Populates the JavaVMInitArgs object represented by this
2985 // ScopedVMInitArgs object with the arguments in options. The
2986 // allocated memory is deleted by the destructor. If this method
2987 // returns anything other than JNI_OK, then this object is in a
2988 // partially constructed state, and should be abandoned.
2989 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2990 _is_set = true;
2991 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2992 JavaVMOption, options->length(), mtArguments);
2993 if (options_arr == nullptr) {
2994 return JNI_ENOMEM;
2995 }
2996 _args.options = options_arr;
2997
2998 for (int i = 0; i < options->length(); i++) {
2999 options_arr[i] = options->at(i);
3000 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3001 if (options_arr[i].optionString == nullptr) {
3002 // Rely on the destructor to do cleanup.
3003 _args.nOptions = i;
3004 return JNI_ENOMEM;
3005 }
3006 }
3007
3008 _args.nOptions = options->length();
3009 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3010 return JNI_OK;
3011 }
3012
3013 JavaVMInitArgs* get() { return &_args; }
3014 char* container_name() { return _container_name; }
3015 bool is_set() { return _is_set; }
3016 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3017 char* vm_options_file_arg() { return _vm_options_file_arg; }
3018
3019 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3020 if (_vm_options_file_arg != nullptr) {
3021 os::free(_vm_options_file_arg);
3022 }
3023 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3024 }
3025
3026 ~ScopedVMInitArgs() {
3027 if (_vm_options_file_arg != nullptr) {
3028 os::free(_vm_options_file_arg);
3029 }
3030 if (_args.options == nullptr) return;
3031 for (int i = 0; i < _args.nOptions; i++) {
3032 os::free(_args.options[i].optionString);
3033 }
3034 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3035 }
3036
3037 // Insert options into this option list, to replace option at
3038 // vm_options_file_pos (-XX:VMOptionsFile)
3039 jint insert(const JavaVMInitArgs* args,
3040 const JavaVMInitArgs* args_to_insert,
3041 const int vm_options_file_pos) {
3042 assert(_args.options == nullptr, "shouldn't be set yet");
3043 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3044 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3045
3046 int length = args->nOptions + args_to_insert->nOptions - 1;
3047 // Construct new option array
3048 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3049 for (int i = 0; i < args->nOptions; i++) {
3050 if (i == vm_options_file_pos) {
3051 // insert the new options starting at the same place as the
3052 // -XX:VMOptionsFile option
3053 for (int j = 0; j < args_to_insert->nOptions; j++) {
3054 options.push(args_to_insert->options[j]);
3055 }
3056 } else {
3057 options.push(args->options[i]);
3058 }
3059 }
3060 // make into options array
3061 return set_args(&options);
3062 }
3063 };
3064
3065 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3066 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3067 }
3068
3069 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3070 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3071 }
3072
3073 jint Arguments::parse_options_environment_variable(const char* name,
3074 ScopedVMInitArgs* vm_args) {
3075 char *buffer = ::getenv(name);
3076
3077 // Don't check this environment variable if user has special privileges
3078 // (e.g. unix su command).
3079 if (buffer == nullptr || os::have_special_privileges()) {
3080 return JNI_OK;
3081 }
3082
3083 if ((buffer = os::strdup(buffer)) == nullptr) {
3084 return JNI_ENOMEM;
3085 }
3086
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Picked up %s: %s\n", name, buffer);
3089
3090 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3091
3092 os::free(buffer);
3093 return retcode;
3094 }
3095
3096 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3097 // read file into buffer
3098 int fd = ::open(file_name, O_RDONLY);
3099 if (fd < 0) {
3100 jio_fprintf(defaultStream::error_stream(),
3101 "Could not open options file '%s'\n",
3102 file_name);
3103 return JNI_ERR;
3104 }
3105
3106 struct stat stbuf;
3107 int retcode = os::stat(file_name, &stbuf);
3108 if (retcode != 0) {
3109 jio_fprintf(defaultStream::error_stream(),
3110 "Could not stat options file '%s'\n",
3111 file_name);
3112 ::close(fd);
3113 return JNI_ERR;
3114 }
3115
3116 if (stbuf.st_size == 0) {
3117 // tell caller there is no option data and that is ok
3118 ::close(fd);
3119 return JNI_OK;
3120 }
3121
3122 // '+ 1' for null termination even with max bytes
3123 size_t bytes_alloc = stbuf.st_size + 1;
3124
3125 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3126 if (nullptr == buf) {
3127 jio_fprintf(defaultStream::error_stream(),
3128 "Could not allocate read buffer for options file parse\n");
3129 ::close(fd);
3130 return JNI_ENOMEM;
3131 }
3132
3133 memset(buf, 0, bytes_alloc);
3134
3135 // Fill buffer
3136 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3137 ::close(fd);
3138 if (bytes_read < 0) {
3139 FREE_C_HEAP_ARRAY(char, buf);
3140 jio_fprintf(defaultStream::error_stream(),
3141 "Could not read options file '%s'\n", file_name);
3142 return JNI_ERR;
3143 }
3144
3145 if (bytes_read == 0) {
3146 // tell caller there is no option data and that is ok
3147 FREE_C_HEAP_ARRAY(char, buf);
3148 return JNI_OK;
3149 }
3150
3151 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3152
3153 FREE_C_HEAP_ARRAY(char, buf);
3154 return retcode;
3155 }
3156
3157 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3158 // Construct option array
3159 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3160
3161 // some pointers to help with parsing
3162 char *buffer_end = buffer + buf_len;
3163 char *opt_hd = buffer;
3164 char *wrt = buffer;
3165 char *rd = buffer;
3166
3167 // parse all options
3168 while (rd < buffer_end) {
3169 // skip leading white space from the input string
3170 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3171 rd++;
3172 }
3173
3174 if (rd >= buffer_end) {
3175 break;
3176 }
3177
3178 // Remember this is where we found the head of the token.
3179 opt_hd = wrt;
3180
3181 // Tokens are strings of non white space characters separated
3182 // by one or more white spaces.
3183 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3184 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3185 int quote = *rd; // matching quote to look for
3186 rd++; // don't copy open quote
3187 while (rd < buffer_end && *rd != quote) {
3188 // include everything (even spaces)
3189 // up until the close quote
3190 *wrt++ = *rd++; // copy to option string
3191 }
3192
3193 if (rd < buffer_end) {
3194 rd++; // don't copy close quote
3195 } else {
3196 // did not see closing quote
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Unmatched quote in %s\n", name);
3199 return JNI_ERR;
3200 }
3201 } else {
3202 *wrt++ = *rd++; // copy to option string
3203 }
3204 }
3205
3206 // steal a white space character and set it to null
3207 *wrt++ = '\0';
3208 // We now have a complete token
3209
3210 JavaVMOption option;
3211 option.optionString = opt_hd;
3212 option.extraInfo = nullptr;
3213
3214 options.append(option); // Fill in option
3215
3216 rd++; // Advance to next character
3217 }
3218
3219 // Fill out JavaVMInitArgs structure.
3220 return vm_args->set_args(&options);
3221 }
3222
3223 #ifndef PRODUCT
3224 // Determine whether LogVMOutput should be implicitly turned on.
3225 static bool use_vm_log() {
3226 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3227 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3228 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3229 PrintAssembly || TraceDeoptimization ||
3230 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3231 return true;
3232 }
3233
3234 #ifdef COMPILER1
3235 if (PrintC1Statistics) {
3236 return true;
3237 }
3238 #endif // COMPILER1
3239
3240 #ifdef COMPILER2
3241 if (PrintOptoAssembly || PrintOptoStatistics) {
3242 return true;
3243 }
3244 #endif // COMPILER2
3245
3246 return false;
3247 }
3248
3249 #endif // PRODUCT
3250
3251 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3252 for (int index = 0; index < args->nOptions; index++) {
3253 const JavaVMOption* option = args->options + index;
3254 const char* tail;
3255 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3256 return true;
3257 }
3258 }
3259 return false;
3260 }
3261
3262 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3263 const char* vm_options_file,
3264 const int vm_options_file_pos,
3265 ScopedVMInitArgs* vm_options_file_args,
3266 ScopedVMInitArgs* args_out) {
3267 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3268 if (code != JNI_OK) {
3269 return code;
3270 }
3271
3272 if (vm_options_file_args->get()->nOptions < 1) {
3273 return JNI_OK;
3274 }
3275
3276 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3277 jio_fprintf(defaultStream::error_stream(),
3278 "A VM options file may not refer to a VM options file. "
3279 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3280 "options file '%s' in options container '%s' is an error.\n",
3281 vm_options_file_args->vm_options_file_arg(),
3282 vm_options_file_args->container_name());
3283 return JNI_EINVAL;
3284 }
3285
3286 return args_out->insert(args, vm_options_file_args->get(),
3287 vm_options_file_pos);
3288 }
3289
3290 // Expand -XX:VMOptionsFile found in args_in as needed.
3291 // mod_args and args_out parameters may return values as needed.
3292 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3293 ScopedVMInitArgs* mod_args,
3294 JavaVMInitArgs** args_out) {
3295 jint code = match_special_option_and_act(args_in, mod_args);
3296 if (code != JNI_OK) {
3297 return code;
3298 }
3299
3300 if (mod_args->is_set()) {
3301 // args_in contains -XX:VMOptionsFile and mod_args contains the
3302 // original options from args_in along with the options expanded
3303 // from the VMOptionsFile. Return a short-hand to the caller.
3304 *args_out = mod_args->get();
3305 } else {
3306 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3307 }
3308 return JNI_OK;
3309 }
3310
3311 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3312 ScopedVMInitArgs* args_out) {
3313 // Remaining part of option string
3314 const char* tail;
3315 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3316
3317 for (int index = 0; index < args->nOptions; index++) {
3318 const JavaVMOption* option = args->options + index;
3319 if (match_option(option, "-XX:Flags=", &tail)) {
3320 Arguments::set_jvm_flags_file(tail);
3321 continue;
3322 }
3323 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3324 if (vm_options_file_args.found_vm_options_file_arg()) {
3325 jio_fprintf(defaultStream::error_stream(),
3326 "The option '%s' is already specified in the options "
3327 "container '%s' so the specification of '%s' in the "
3328 "same options container is an error.\n",
3329 vm_options_file_args.vm_options_file_arg(),
3330 vm_options_file_args.container_name(),
3331 option->optionString);
3332 return JNI_EINVAL;
3333 }
3334 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3335 // If there's a VMOptionsFile, parse that
3336 jint code = insert_vm_options_file(args, tail, index,
3337 &vm_options_file_args, args_out);
3338 if (code != JNI_OK) {
3339 return code;
3340 }
3341 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3342 if (args_out->is_set()) {
3343 // The VMOptions file inserted some options so switch 'args'
3344 // to the new set of options, and continue processing which
3345 // preserves "last option wins" semantics.
3346 args = args_out->get();
3347 // The first option from the VMOptionsFile replaces the
3348 // current option. So we back track to process the
3349 // replacement option.
3350 index--;
3351 }
3352 continue;
3353 }
3354 if (match_option(option, "-XX:+PrintVMOptions")) {
3355 PrintVMOptions = true;
3356 continue;
3357 }
3358 if (match_option(option, "-XX:-PrintVMOptions")) {
3359 PrintVMOptions = false;
3360 continue;
3361 }
3362 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3363 IgnoreUnrecognizedVMOptions = true;
3364 continue;
3365 }
3366 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3367 IgnoreUnrecognizedVMOptions = false;
3368 continue;
3369 }
3370 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3371 JVMFlag::printFlags(tty, false);
3372 vm_exit(0);
3373 }
3374
3375 #ifndef PRODUCT
3376 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3377 JVMFlag::printFlags(tty, true);
3378 vm_exit(0);
3379 }
3380 #endif
3381 }
3382 return JNI_OK;
3383 }
3384
3385 static void print_options(const JavaVMInitArgs *args) {
3386 const char* tail;
3387 for (int index = 0; index < args->nOptions; index++) {
3388 const JavaVMOption *option = args->options + index;
3389 if (match_option(option, "-XX:", &tail)) {
3390 logOption(tail);
3391 }
3392 }
3393 }
3394
3395 bool Arguments::handle_deprecated_print_gc_flags() {
3396 if (PrintGC) {
3397 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3398 }
3399 if (PrintGCDetails) {
3400 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3401 }
3402
3403 if (_legacyGCLogging.lastFlag == 2) {
3404 // -Xloggc was used to specify a filename
3405 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3406
3407 LogTarget(Error, logging) target;
3408 LogStream errstream(target);
3409 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3410 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3411 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3412 }
3413 return true;
3414 }
3415
3416 static void apply_debugger_ergo() {
3417 #ifdef ASSERT
3418 if (ReplayCompiles) {
3419 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3420 }
3421
3422 if (UseDebuggerErgo) {
3423 // Turn on sub-flags
3424 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3425 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3426 }
3427
3428 if (UseDebuggerErgo2) {
3429 // Debugging with limited number of CPUs
3430 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3431 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3432 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3433 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3434 }
3435 #endif // ASSERT
3436 }
3437
3438 // Parse entry point called from JNI_CreateJavaVM
3439
3440 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3441 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3442 JVMFlag::check_all_flag_declarations();
3443
3444 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3445 const char* hotspotrc = ".hotspotrc";
3446 bool settings_file_specified = false;
3447 bool needs_hotspotrc_warning = false;
3448 ScopedVMInitArgs initial_vm_options_args("");
3449 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3450 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3451
3452 // Pointers to current working set of containers
3453 JavaVMInitArgs* cur_cmd_args;
3454 JavaVMInitArgs* cur_vm_options_args;
3455 JavaVMInitArgs* cur_java_options_args;
3456 JavaVMInitArgs* cur_java_tool_options_args;
3457
3458 // Containers for modified/expanded options
3459 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3460 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3461 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3462 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3463
3464
3465 jint code =
3466 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3467 if (code != JNI_OK) {
3468 return code;
3469 }
3470
3471 code = parse_java_options_environment_variable(&initial_java_options_args);
3472 if (code != JNI_OK) {
3473 return code;
3474 }
3475
3476 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3477 char *vmoptions = ClassLoader::lookup_vm_options();
3478 if (vmoptions != nullptr) {
3479 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3480 FREE_C_HEAP_ARRAY(char, vmoptions);
3481 if (code != JNI_OK) {
3482 return code;
3483 }
3484 }
3485
3486 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3487 &mod_java_tool_options_args,
3488 &cur_java_tool_options_args);
3489 if (code != JNI_OK) {
3490 return code;
3491 }
3492
3493 code = expand_vm_options_as_needed(initial_cmd_args,
3494 &mod_cmd_args,
3495 &cur_cmd_args);
3496 if (code != JNI_OK) {
3497 return code;
3498 }
3499
3500 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3501 &mod_java_options_args,
3502 &cur_java_options_args);
3503 if (code != JNI_OK) {
3504 return code;
3505 }
3506
3507 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3508 &mod_vm_options_args,
3509 &cur_vm_options_args);
3510 if (code != JNI_OK) {
3511 return code;
3512 }
3513
3514 const char* flags_file = Arguments::get_jvm_flags_file();
3515 settings_file_specified = (flags_file != nullptr);
3516
3517 if (IgnoreUnrecognizedVMOptions) {
3518 cur_cmd_args->ignoreUnrecognized = true;
3519 cur_java_tool_options_args->ignoreUnrecognized = true;
3520 cur_java_options_args->ignoreUnrecognized = true;
3521 }
3522
3523 // Parse specified settings file
3524 if (settings_file_specified) {
3525 if (!process_settings_file(flags_file, true,
3526 cur_cmd_args->ignoreUnrecognized)) {
3527 return JNI_EINVAL;
3528 }
3529 } else {
3530 #ifdef ASSERT
3531 // Parse default .hotspotrc settings file
3532 if (!process_settings_file(".hotspotrc", false,
3533 cur_cmd_args->ignoreUnrecognized)) {
3534 return JNI_EINVAL;
3535 }
3536 #else
3537 struct stat buf;
3538 if (os::stat(hotspotrc, &buf) == 0) {
3539 needs_hotspotrc_warning = true;
3540 }
3541 #endif
3542 }
3543
3544 if (PrintVMOptions) {
3545 print_options(cur_java_tool_options_args);
3546 print_options(cur_cmd_args);
3547 print_options(cur_java_options_args);
3548 }
3549
3550 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3551 jint result = parse_vm_init_args(cur_vm_options_args,
3552 cur_java_tool_options_args,
3553 cur_java_options_args,
3554 cur_cmd_args);
3555
3556 if (result != JNI_OK) {
3557 return result;
3558 }
3559
3560 // Delay warning until here so that we've had a chance to process
3561 // the -XX:-PrintWarnings flag
3562 if (needs_hotspotrc_warning) {
3563 warning("%s file is present but has been ignored. "
3564 "Run with -XX:Flags=%s to load the file.",
3565 hotspotrc, hotspotrc);
3566 }
3567
3568 if (needs_module_property_warning) {
3569 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3570 " names that are reserved for internal use.");
3571 }
3572
3573 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3574 UNSUPPORTED_OPTION(UseLargePages);
3575 #endif
3576
3577 #if defined(AIX)
3578 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3579 #endif
3580
3581 #ifndef PRODUCT
3582 if (TraceBytecodesAt != 0) {
3583 TraceBytecodes = true;
3584 }
3585 #endif // PRODUCT
3586
3587 if (ScavengeRootsInCode == 0) {
3588 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3589 warning("Forcing ScavengeRootsInCode non-zero");
3590 }
3591 ScavengeRootsInCode = 1;
3592 }
3593
3594 if (!handle_deprecated_print_gc_flags()) {
3595 return JNI_EINVAL;
3596 }
3597
3598 // Set object alignment values.
3599 set_object_alignment();
3600
3601 #if !INCLUDE_CDS
3602 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3603 jio_fprintf(defaultStream::error_stream(),
3604 "Shared spaces are not supported in this VM\n");
3605 return JNI_ERR;
3606 }
3607 if (DumpLoadedClassList != nullptr) {
3608 jio_fprintf(defaultStream::error_stream(),
3609 "DumpLoadedClassList is not supported in this VM\n");
3610 return JNI_ERR;
3611 }
3612 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3613 log_is_enabled(Info, cds)) {
3614 warning("Shared spaces are not supported in this VM");
3615 UseSharedSpaces = false;
3616 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3617 }
3618 no_shared_spaces("CDS Disabled");
3619 #endif // INCLUDE_CDS
3620
3621 // Verify NMT arguments
3622 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3623 if (lvl == NMT_unknown) {
3624 jio_fprintf(defaultStream::error_stream(),
3625 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3626 return JNI_ERR;
3627 }
3628 if (PrintNMTStatistics && lvl == NMT_off) {
3629 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3630 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3631 }
3632
3633 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3634 if (trace_dependencies && VerifyDependencies) {
3635 warning("dependency logging results may be inflated by VerifyDependencies");
3636 }
3637
3638 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3639 log_is_enabled(Info, class, load, cause);
3640 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3641 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3642 }
3643
3644 apply_debugger_ergo();
3645
3646 // The VMThread needs to stop now and then to execute these debug options.
3647 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3648 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3649 }
3650
3651 if (log_is_enabled(Info, arguments)) {
3652 LogStream st(Log(arguments)::info());
3653 Arguments::print_on(&st);
3654 }
3655
3656 return JNI_OK;
3657 }
3658
3659 void Arguments::set_compact_headers_flags() {
3660 #ifdef _LP64
3661 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3662 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3663 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
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 && LockingMode != LM_LIGHTWEIGHT) {
3679 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3680 }
3681 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3682 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3683 }
3684 #endif
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 set_compact_headers_flags();
3698
3699 if (UseCompressedClassPointers) {
3700 CompressedKlassPointers::pre_initialize();
3701 }
3702
3703 CDSConfig::initialize();
3704
3705 // Initialize Metaspace flags and alignments
3706 Metaspace::ergo_initialize();
3707
3708 if (!StringDedup::ergo_initialize()) {
3709 return JNI_EINVAL;
3710 }
3711
3712 // Set compiler flags after GC is selected and GC specific
3713 // flags (LoopStripMiningIter) are set.
3714 CompilerConfig::ergo_initialize();
3715
3716 // Set bytecode rewriting flags
3717 set_bytecode_flags();
3718
3719 // Set flags if aggressive optimization flags are enabled
3720 jint code = set_aggressive_opts_flags();
3721 if (code != JNI_OK) {
3722 return code;
3723 }
3724
3725 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3726 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3727 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3728 warning("UseSecondarySupersTable is not supported");
3729 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3730 }
3731 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address()
3732 if (!UseSecondarySupersTable) {
3733 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3734 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3735 }
3736
3737 #ifdef ZERO
3738 // Clear flags not supported on zero.
3739 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3740 #endif // ZERO
3741
3742 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3743 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3744 DebugNonSafepoints = true;
3745 }
3746
3747 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3748 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3749 }
3750
3751 // Treat the odd case where local verification is enabled but remote
3752 // verification is not as if both were enabled.
3753 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3754 log_info(verification)("Turning on remote verification because local verification is on");
3755 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3756 }
3757
3758 #ifndef PRODUCT
3759 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3760 if (use_vm_log()) {
3761 LogVMOutput = true;
3762 }
3763 }
3764 #endif // PRODUCT
3765
3766 if (PrintCommandLineFlags) {
3767 JVMFlag::printSetFlags(tty);
3768 }
3769
3770 #if COMPILER2_OR_JVMCI
3771 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3772 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3773 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3774 }
3775 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3776
3777 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3778 if (!EnableVectorReboxing) {
3779 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3780 } else {
3781 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3782 }
3783 }
3784 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3785
3786 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3787 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3788 }
3789 FLAG_SET_DEFAULT(UseVectorStubs, false);
3790 }
3791 #endif // COMPILER2_OR_JVMCI
3792
3793 if (log_is_enabled(Info, init)) {
3794 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3795 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3796 }
3797 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3798 // automatically enable -Xlog:perf+class+link
3799 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3800 }
3801 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3802 } else {
3803 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3804 warning("Disabling ProfileVMLocks since logging is turned off.");
3805 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3806 }
3807 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3808 warning("Disabling ProfileVMCalls since logging is turned off.");
3809 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3810 }
3811 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3812 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3813 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3814 }
3815 if (log_is_enabled(Info, perf, class, link)) {
3816 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3817 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3818 }
3819 }
3820 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3821 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3822 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3823 }
3824 }
3825
3826 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3827 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3828 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3829 }
3830 }
3831 return JNI_OK;
3832 }
3833
3834 jint Arguments::adjust_after_os() {
3835 if (UseNUMA) {
3836 if (UseParallelGC) {
3837 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3838 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3839 }
3840 }
3841 }
3842 return JNI_OK;
3843 }
3844
3845 int Arguments::PropertyList_count(SystemProperty* pl) {
3846 int count = 0;
3847 while(pl != nullptr) {
3848 count++;
3849 pl = pl->next();
3850 }
3851 return count;
3852 }
3853
3854 // Return the number of readable properties.
3855 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3856 int count = 0;
3857 while(pl != nullptr) {
3858 if (pl->readable()) {
3859 count++;
3860 }
3861 pl = pl->next();
3862 }
3863 return count;
3864 }
3865
3866 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3867 assert(key != nullptr, "just checking");
3868 SystemProperty* prop;
3869 for (prop = pl; prop != nullptr; prop = prop->next()) {
3870 if (strcmp(key, prop->key()) == 0) return prop->value();
3871 }
3872 return nullptr;
3873 }
3874
3875 // Return the value of the requested property provided that it is a readable property.
3876 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3877 assert(key != nullptr, "just checking");
3878 SystemProperty* prop;
3879 // Return the property value if the keys match and the property is not internal or
3880 // it's the special internal property "jdk.boot.class.path.append".
3881 for (prop = pl; prop != nullptr; prop = prop->next()) {
3882 if (strcmp(key, prop->key()) == 0) {
3883 if (!prop->internal()) {
3884 return prop->value();
3885 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3886 return prop->value();
3887 } else {
3888 // Property is internal and not jdk.boot.class.path.append so return null.
3889 return nullptr;
3890 }
3891 }
3892 }
3893 return nullptr;
3894 }
3895
3896 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3897 SystemProperty* p = *plist;
3898 if (p == nullptr) {
3899 *plist = new_p;
3900 } else {
3901 while (p->next() != nullptr) {
3902 p = p->next();
3903 }
3904 p->set_next(new_p);
3905 }
3906 }
3907
3908 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3909 bool writeable, bool internal) {
3910 if (plist == nullptr)
3911 return;
3912
3913 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3914 PropertyList_add(plist, new_p);
3915 }
3916
3917 void Arguments::PropertyList_add(SystemProperty *element) {
3918 PropertyList_add(&_system_properties, element);
3919 }
3920
3921 // This add maintains unique property key in the list.
3922 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3923 PropertyAppendable append, PropertyWriteable writeable,
3924 PropertyInternal internal) {
3925 if (plist == nullptr)
3926 return;
3927
3928 // If property key exists and is writeable, then update with new value.
3929 // Trying to update a non-writeable property is silently ignored.
3930 SystemProperty* prop;
3931 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3932 if (strcmp(k, prop->key()) == 0) {
3933 if (append == AppendProperty) {
3934 prop->append_writeable_value(v);
3935 } else {
3936 prop->set_writeable_value(v);
3937 }
3938 return;
3939 }
3940 }
3941
3942 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3943 }
3944
3945 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3946 // Returns true if all of the source pointed by src has been copied over to
3947 // the destination buffer pointed by buf. Otherwise, returns false.
3948 // Notes:
3949 // 1. If the length (buflen) of the destination buffer excluding the
3950 // null terminator character is not long enough for holding the expanded
3951 // pid characters, it also returns false instead of returning the partially
3952 // expanded one.
3953 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3954 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3955 char* buf, size_t buflen) {
3956 const char* p = src;
3957 char* b = buf;
3958 const char* src_end = &src[srclen];
3959 char* buf_end = &buf[buflen - 1];
3960
3961 while (p < src_end && b < buf_end) {
3962 if (*p == '%') {
3963 switch (*(++p)) {
3964 case '%': // "%%" ==> "%"
3965 *b++ = *p++;
3966 break;
3967 case 'p': { // "%p" ==> current process id
3968 // buf_end points to the character before the last character so
3969 // that we could write '\0' to the end of the buffer.
3970 size_t buf_sz = buf_end - b + 1;
3971 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3972
3973 // if jio_snprintf fails or the buffer is not long enough to hold
3974 // the expanded pid, returns false.
3975 if (ret < 0 || ret >= (int)buf_sz) {
3976 return false;
3977 } else {
3978 b += ret;
3979 assert(*b == '\0', "fail in copy_expand_pid");
3980 if (p == src_end && b == buf_end + 1) {
3981 // reach the end of the buffer.
3982 return true;
3983 }
3984 }
3985 p++;
3986 break;
3987 }
3988 default :
3989 *b++ = '%';
3990 }
3991 } else {
3992 *b++ = *p++;
3993 }
3994 }
3995 *b = '\0';
3996 return (p == src_end); // return false if not all of the source was copied
3997 }